HK1127318B - Shank attaching structure - Google Patents

Description

Shank portion mounting structure

Technical Field

The present invention relates to a shank attachment structure capable of quickly and easily attaching a shank of a tool to a tool holder on a drilling apparatus side in a one-time operation type.

Background

Conventionally, there is a shank attachment structure capable of attaching a shank of a tool bit, the base end of which is attached to a drilling device (an electric drill or a drill press), by one operation. In the case of this one-time operation type shank attachment structure, the shank of the tool can be attached to the holder by one-time operation using a locking mechanism disposed between the shank of the tool and the holder by merely inserting the shank of the tool from below into a shank attachment hole opened in a lower surface of the holder (see patent document 1).

In order to solve the technical problem of the above-described shank attachment structure, the present applicant further provides a shank attachment structure having a simple structure, which can be detached by simply operating a detaching sleeve with one hand even when detached, and which can supply a coolant (cutting fluid) from the inside without the shank falling off even when an error occurs in the rotation of the drilling device and a certain point comes into contact with the sleeve (see patent document 2).

Patent document 1: japanese unexamined patent publication Hei 7-9211

Patent document 2: WO98/37999 publication

However, in the case of the shank attachment structure described in patent document 2, the coolant can be supplied only in the case of a drill provided with a center pin, but cannot be supplied in the case of a drill such as a core drill without a center pin. In the case of the shank attachment structure described in patent document 2, the amount of coolant cannot be adjusted according to cutting conditions and the like.

Disclosure of Invention

The present invention has been made in view of the above-described situation, and an object thereof is to provide a shank attachment structure that solves the above-described problems.

The object of the present invention can be achieved by a shank attachment structure configured as follows.

The shank attachment structure of the present invention is a shank attachment structure in which a locking member is disposed so as to protrude from an inner peripheral surface toward an inner radial side and to retreat from this state toward an outer radial side, and a shank on a tool side is detachably attached to a cylindrical shank attachment hole in a one-touch manner, the shank attachment hole being provided in a shank body portion so as to extend in a hole longitudinal direction in an axial direction of a tool shank and having a tip end opening at a tip end surface of the shank body portion, the shank portion having a recess at a base end portion for receiving a part of the locking member,

a coolant supply hole is formed at a radially central portion of the body portion adjacent to a base end side of the shank attachment hole so that a tip end thereof communicates with the shank attachment hole,

the coolant supply hole is provided at a distal end portion thereof with a valve body movable toward a base end side, and a seal member is provided at a position of the coolant supply hole at a distal end of the coolant supply hole with respect to the valve body, the seal member being in contact with the valve body so as to be capable of forming a liquid-tight state with the valve body.

The first sleeve is provided in the shank attachment hole such that a proximal end of the shank abuts against a distal end of the first sleeve and moves toward a proximal end side in the axial direction, the pressing portion abuts against the valve body by the movement to separate the valve body from the sealing member, and an outer peripheral surface having an outer diameter substantially equal to a diameter of the shank attachment hole is formed in a state where the shank does not abut against the distal end of the first sleeve, so that the locking member can be retracted from an inner peripheral surface of the shank attachment hole toward an outer diameter side.

A valve body operating member is disposed in the shank attachment hole, the operating member having a pressing portion at a base end thereof for pressing the valve body away from the sealing member and an abutment surface at a tip end thereof for abutting against the shank.

According to the shank attachment structure of the present invention configured as described above, when the shank of the tool is inserted into the shank attachment hole of the tool shank body, the base end of the shank moves the valve body operation member disposed in the shank attachment hole of the tool shank body toward the base end side of the shank attachment hole. The pressing portion of the valve body operating member moves the valve body toward the base end side by the movement, and separates the valve body from the sealing member. Therefore, even for a tool without a center pin, coolant can be supplied to the tool side only during insertion.

When the shank of the tool is inserted into the shank attachment hole of the tool body, the base end of the shank moves the first sleeve disposed in the shank attachment hole of the tool body toward the base end side of the shank attachment hole, the locking member protrudes from the inner peripheral surface of the tool body toward the inner diameter side, and a part of the locking member is locked in the recess of the shank. As a result, the grip can be mounted on the blade holder in a single operation.

In the above-described shank attachment structure, the first sleeve and the valve body operation member may be integrally connected, and in this case, the number of parts can be reduced.

In the above-described handle attachment structure, the valve body and the valve body operation member may be integrally connected, and in this case, the number of parts can be reduced.

In the shank attachment structure, the shank has an outer diameter sized to be inserted into the shank attachment hole in a state where the locking member is retracted from the inner peripheral surface of the shank attachment hole to the outer diameter side,

the recessed portion is formed in a long hole shape at the proximal end portion of the shank portion so that the shank portion is freely movable only a predetermined distance in the axial direction of the tool holder in a state where a part of the locking member is accommodated in the recessed portion,

in a state in which the locking member is positioned at the front end position of the long-hole shank recess, the first sleeve separates the valve body from the seal member, and in a state in which the locking member is positioned at the base end position of the long-hole shank recess, the first sleeve does not separate the valve body from the seal member, and in a state in which the locking member of the tool holder is locked to the recess of the shank and the tool is locked to the tool holder, the following states can be established: the coolant can be supplied in a state where the locking member is located at the tip end position of the shank long-hole-shaped recess, while the coolant is stopped being supplied in a state where the locking member is located at the base end position of the shank long-hole-shaped recess.

Even when the tool is inserted into the surface to be machined, the valve body is not separated from the sealing member and the coolant is not supplied to the tool side in a state where the tip of the tool is in contact with the surface to be machined, and when the tool is further pressed toward the base end side from this state, the locking member of the tool holder moves toward the tip side in the recess of the tool shank, and the tool shank is further inserted into the shank attachment hole of the tool holder. As a result, the base end of the shank moves the first sleeve of the tool holder toward the base end, presses the valve body toward the base end, and separates from the sealing member. Therefore, by forming a gap between the valve body and the seal member, the coolant supplied to the coolant supply hole is supplied from the gap to the tool side through the shank attachment hole.

Thus, even for a tool not provided with a center pin, coolant can be supplied to the cutting portion only during cutting.

In the shank attachment structure, a locking recess is formed annularly in a circumferential direction of the shank attachment hole at a tip end position of the shank attachment hole adjacent to a tip end of the first sleeve axial movement region, and a retainer ring member is disposed in the locking recess, the retainer ring member including: an inner diameter of the minimum diameter portion slightly smaller than an outer diameter of the shank base end and an outer diameter of the maximum diameter portion larger than an outer diameter of the recess in a free state, the minimum diameter portion having a wavy annular shape in which one portion bulges outward in an outer diameter direction and the other portion is retracted relative to a virtual perfect circle, the portion bulging outward in the outer diameter direction being deformable in an axial direction of the shank attachment hole,

when the shank is inserted into the shank attachment hole, the retainer ring member is deformed in a state of being locked in the locking recess, allowing the shank to be inserted further into the shank attachment hole through the retainer ring member, and when the shank is pulled out, the retainer ring member is deformed in a state of being locked in the locking recess, and only the shank can be pulled out from the shank attachment hole.

The first sleeve can be held in the shank attachment hole by the retainer ring member when the shank is inserted into and removed from the shank attachment hole. Therefore, the first sleeve can be maintained in the state of being accommodated in the shank attachment hole by a very simple structure.

In the shank attachment structure, a wall thickness of the portion of the body portion where the locking member is disposed is set to be smaller than a dimension of the locking member in a thickness direction of the wall,

the first sleeve has a holding hole formed in the wall portion in a direction orthogonal to the axial direction, the holding hole having an inner diameter side end opening to an inner peripheral surface of the shank attachment hole in a moving region in the shank attachment hole to move in the axial direction and an outer diameter side end opening to an outer peripheral surface of the wall portion,

and a first elastic member is disposed on a proximal end side of the first socket in the shank attachment hole so that a distal end of the first socket is urged in contact with the stopper member,

in order to be movable in either one of the distal end and the proximal end of the holder in the axial direction, a second sleeve having a first cam surface and a second cam surface on an inner peripheral surface is provided on an outer peripheral side of the main body so that the locking member in the holding hole can be pressed to the inner diameter side by the first cam surface projecting to the inner diameter in a state of being movable in the one direction and the locking member can be accommodated on the outer diameter side by the second cam surface in a state of not being movable, and the locking member can be retracted to the outer diameter side in the holding hole by pressing the second sleeve in the one direction by an elastic force of a second elastic member in a state where a part of the locking member is accommodated in a recess of a shank and maintaining the second sleeve in the non-moving state against the elastic force of the second elastic member,

when the shank is inserted only into the shank attachment hole of the tool holder in a state where the second sleeve is moved in the opposite direction to the one direction (the proximal end side direction or the distal end side direction), the locking member is moved in the axial direction while contacting the outer peripheral surface of the shank, and a part of the inner diameter side of the locking member is received in the recess formed in the shank.

When the locking member is received in the recess, the locked state of the second sleeve locked by the locking member is released, and the second sleeve is moved in the one direction by the elastic force of the second elastic member. As a result, the shank is retained in the shank attachment hole of the tool holder. Thus, the shank can be attached to the shank attachment hole of the tool holder in one operation.

On the other hand, when the shank is removed from the tool holder, the second sleeve is moved in a direction opposite to the first direction, and the locking member, a part of which is accommodated in the recess, is allowed to retreat to the outer diameter side, and the locking of the locking member with the shank recess is released. As a result, the tool-side shank can be simply removed from the tool holder.

Therefore, the operator can insert the shank into the shank attachment hole of the tool holder when attaching the shank, and can easily detach the shank by moving the second sleeve in the direction opposite to the one direction against the second elastic member when detaching the shank. That is, the shank can be easily attached to and detached from the holder with a single hand. By sliding the second sleeve in the direction opposite to the one direction (the distal direction or the proximal direction), the shank can be detached from the arbor. Therefore, unlike the conventional art, even if something is abutted against the second sleeve by mistake during rotation, the shank portion does not fall off. In particular, the structure in which the second sleeve is pressed against the proximal end side and the locking member is released by sliding the second sleeve toward the distal end side, is excellent in that the shank does not come off the tool holder even if the inserted object has a foreign object or a projection and comes into contact with the second sleeve.

In view of the above, the present invention provides a shank attachment structure that can be manufactured by a simple process, such as a circular process or a combined process, and that can be easily manufactured and assembled.

In the shank attachment structure, the main body portion of the tool holder is formed with a first coolant supply passage having a leading end communicating with the coolant supply hole and a base end exposed to an outer peripheral surface of the main body portion,

a fixing member is disposed on an outer periphery of the body portion, the fixing member including: a second coolant supply passage having an annular passage opening to an inner peripheral surface, and a third coolant supply passage having a distal end communicating with a proximal end of the second coolant supply passage and a proximal end exposed to an outer periphery, and having a cylindrical main body holding hole rotatably supporting the main body from an outer peripheral side, the fixing member being disposed in a state in which the proximal end of the first coolant supply passage communicates with the distal end of the second coolant supply passage,

the third coolant supply passage of the fixed member is provided with a coolant flow rate adjustment mechanism capable of changing a passage cross section of the third coolant supply passage, and by operating the flow rate adjustment mechanism, a necessary and sufficient amount of coolant can be supplied from the third coolant supply passage to the cutting portion of the tool through the second coolant supply passage and the first coolant supply passage from the coolant supply hole.

In the handle mounting structure, the flow adjustment mechanism includes: a flow rate adjusting mechanism capable of accurately adjusting the flow rate can be realized with a simple configuration by forming a tapered hole portion in the third coolant supply passage, a tapered core member having an outer shape corresponding to the tapered hole, and a screw mechanism provided so that the tapered core member can be moved toward and away from the tapered hole portion.

In the above-described shank attachment structure, the locking member is a ball, the sealing member is an O-ring made of an elastic member, and in the case of a structure in which the ball is biased toward the sealing member by a coil spring, the structure is simple, and the structure is simple to process and assemble.

According to the shank attachment structure of the present invention, in the case of a drill without a center pin, it is possible to realize supply of a necessary amount of coolant only at the time of machining by a simple structure.

Drawings

Fig. 1 is a plan view of a shank attachment structure according to embodiment 1 of the present invention, viewed from the side of attachment to a drilling apparatus;

FIG. 2 is a side view showing an internal structure in a partial cross section in a view from II-II of FIG. 1;

FIG. 3 is a bottom view of the shank attachment structure's shank as viewed from III-III of FIG. 2;

FIG. 4 is a side view of a shank attachment structure in which a tool is attached to the holder shown in FIG. 1, and the holder and the tool are partially cut away to show the internal structure;

FIG. 5 is a side view, partially in section, showing a shank attachment structure of an internal structure, in a state where the shank of the tool is inserted into the shank attachment hole of the holder from the state shown in FIG. 4;

FIG. 6 is a side view, partially in section, showing a shank attachment structure of an internal structure, showing a state in which a tool is inserted further toward a base end side from the state shown in FIG. 5;

FIG. 7 is a view showing the shank attachment hole as viewed from the bottom surface direction in a state where a part of the first stopper ring is inserted into the locking recess in the shank attachment hole and protrudes radially inward from the inner peripheral surface of the shank attachment hole;

FIG. 8 is a top plan view of the first stop ring structure shown in FIG. 7;

FIG. 9 is a view, partially in cross-section, of the flow regulator construction of the shank attachment arrangement of FIG. 2;

FIG. 10 is a view showing a state in which the flow rate regulator shown in FIG. 9 is adjusted to a state in which no coolant is supplied;

fig. 11 is a side view showing a shank attachment structure in a partial cross section according to another embodiment (embodiment 2) different from the embodiment shown in fig. 1 to 10;

fig. 12 is a side view, partially in section, showing a shank attachment structure according to another embodiment (embodiment 3) different from the embodiments 1 and 2, and shows a state before a tool is attached to a tool holder;

fig. 13 is a side view, partially in cross section, showing a state in which the shank of the tool is inserted into the shank attachment hole of the holder from the state shown in fig. 12 and then inserted further toward the proximal end side.

Description of the symbols

Coolant supply hole of shank C tool 2 shank attachment hole 3

4 sealing member 5 valve body 15 stop member 20 first sleeve

1B body 30 shank 31 recess

Detailed Description

The handle attachment structure according to the embodiment of the present invention will be specifically described below with reference to the drawings. The present invention is not limited to these examples.

(example 1)

Fig. 1 is a plan view of the tool holder of the present embodiment viewed from the side of the drilling apparatus, fig. 2 is a side view showing an internal structure in a partial section in a view from II-II of fig. 1, and fig. 3 is a bottom view in a view from III-III of fig. 2.

In fig. 1 to 3, a denotes a tool holder, and as shown in fig. 1 to 3, the tool holder a includes a tool holder body 1, and the tool holder body 1 includes: a main body 1B integrally attached to a rotation shaft of a drilling device (not shown) and rotating integrally with the rotation shaft, and a fixing member 1A rotatably supporting the main body 1B in a state in which a base end portion (upper half portion in fig. 2) of the main body 1B is covered from the outer periphery.

The fixing member 1A is held in a state of being fixed to and not rotatable by a fixing bracket 90 integrally attached via an attachment screw B to a body or the like of the drilling device, not shown.

As shown in fig. 2, in this embodiment, the body 1B has a cylindrical shape having a stepped portion 1E whose diameter is increased at a central lower portion, and is rotatably supported in a cylindrical body holding hole 1E formed at the center of the fixing member 1A via a pair of bearings 12A and 12B disposed apart from each other at a proximal end side and a distal end side at an upper portion of the stepped portion 1E. In order not to leak the coolant from the mounting portions of the bearings 12A, 12B, seal members 23 are provided between the fixing member 1A and the main body portion 1B, i.e., the mounting portions of the bearings 12A, 12B, respectively.

A cylindrical shank attachment hole 2 having a distal end opened to a distal end (lower end in fig. 2) surface with a center axis X of the holder body 1 as a center of the hole and extending from the opening 2a to a proximal end side (upper side in fig. 2) is formed in a radially enlarged distal end portion of the body portion 1B.

A mounting shaft portion 1W for mounting to a shank portion of the drilling device, not shown, is formed at a reduced diameter proximal end portion of the body portion 1B. And the shank attachment hole 2 is formed concentrically with the shank attachment hole 1 at a radially central portion of the body portion 1B below the attachment shaft portion 1W: a cylindrical coolant supply hole 3 having a tip end communicating with the base end of the shank attachment hole 2 and having a smaller diameter than the shank attachment hole 2. In fig. 2, since a coil spring 6 described later is provided in the coolant supply hole 3, a part of the coolant supply hole 3 is shielded by the coil spring 6.

In the present embodiment, an inner peripheral surface of the stepped portion 1E is provided at a distal end portion (lower end portion in fig. 2) of the coolant supply hole 3, and a recessed ring groove 3A having a rectangular groove cross section and opening to the inner peripheral surface is provided over the entire periphery. An O-ring (seal member) 4 made of an elastic body (rubber in this embodiment) is disposed in the ring groove 3A with its inner peripheral portion protruding from the inner peripheral surface of the coolant supply hole 3 toward the inner peripheral side. On the base end side in the coolant supply hole 3 where the O-ring 4 is disposed, a valve body 5 made of a metal ball that is movable in the coolant supply hole 3 is provided, and a portion closer to the base end than the O-ring 4 is biased by a coil spring 6 from the base end side (upper end side in fig. 2) toward the tip end direction (the O-ring 4 direction). In the present embodiment, the valve element 5 is formed of a spherical body, but may be formed of another shape, for example, a cylindrical body having a conical tip. Alternatively, the valve body may be the one described in embodiment 3. In the present embodiment, the sealing member is also constituted by the O-ring 4, but may be in a form other than the O-ring.

The tip (inner diameter end: upstream end) of the first coolant supply passage 7 extending radially in the main body portion 1B communicates orthogonally with the base end (upper end in fig. 2) of the coolant supply hole 3. The base end (outer diameter end: downstream end) of the first coolant supply passage 7 is exposed to the outer peripheral surface 1B of the main body 1B.

A second coolant supply passage 8, which is an annular space and communicates with a base end (downstream end) of the first coolant supply passage 7, is formed in the inner peripheral surface of the fixed member 1A. In the case of the present embodiment, the second coolant supply passage 8 is formed on the inner diameter side of a flange member 9 made of an annular polymer material (e.g., synthetic rubber) that is integrally attached and forms a part of the fixing member 1A. The inner peripheral surface of the flange member 9 covers the body portion 1B of the holder body 1 in a liquid-tight manner. A third coolant supply passage 10, which is formed in a tubular shape on one side (the left side in fig. 2) of the flange member 9, communicates with the second coolant supply passage 8. In the present embodiment, the front end of the third coolant supply passage 10 protrudes into the flange member 9.

A flow rate regulator 16 is attached to a base end portion of the third coolant supply passage 10. As shown in fig. 9 in an enlarged partial cross-sectional view, the flow rate adjuster 16 is configured such that a core member 16A having a tapered outer shape with the same taper angle is disposed in a tapered hole 16B, and the core member 16A is moved in the hole length direction (the left-right direction in fig. 2, 9, and 10) relative to the hole 16B, whereby a gap 16A capable of arbitrarily changing the cross-sectional area of the passage is formed between the inner circumferential surface of the hole 16B and the outer circumferential surface of the core member 16A, and the flow rate of the coolant passing therethrough can be adjusted. A straight hole 16C is formed in a base end side (left side in fig. 2, 9, and 10) of the tapered hole 16B, and a fourth coolant supply passage 17, which connects a coolant supply hose (not shown) to the base end (downstream end), communicates with an outer peripheral surface of the hole 16C. A female screw 16f is formed on the inner peripheral surface of the base end of the hole 16C, and a male screw 16m screwed with the female screw 16f is formed on the base end of the core member 16A, and the clearance 16A can be changed from a "no" state (see fig. 10) to an arbitrary size by this screw mechanism. An adjustment knob 16D for operating the screw mechanism is integrally formed at the base end of the core member 16A. In fig. 9 and 10, reference numeral 16s denotes a seal member for sealing between the core member 16A and the hole 16B.

A plurality of holding holes 1g (for example, three holding holes in the present embodiment) are formed in the expanded diameter distal end portion 1d of the body portion 1B in a circumferentially spaced manner, the holding holes 1g have a circular hole cross section penetrating in a direction (radial direction) orthogonal to the axial direction of the shank attachment hole 2 and hold the locking member 15, and the metallic spherical locking member 15 is movably disposed in the holding holes 1g in the radial direction of the body portion 1B.

Since the hole length of the holding hole 1g, in other words, the thickness of the wall portion of the body portion 1B where the holding hole 1g is formed is smaller than the diameter of the locking member 15, a part of the locking member 15 accommodated in the holding hole 1g is in a state of protruding toward the outer peripheral surface 1a or the inner peripheral surface 1i of the body portion 1B.

A second sleeve 11 is disposed on the outer peripheral side of the cylindrical shape of the body portion 1B in which the holding hole 1g is formed, and the second sleeve 11 is slidable in the axial direction (longitudinal direction: vertical direction in fig. 2) along the outer peripheral surface 1a of the body portion 1B. In the present embodiment, the second sleeve 11 is pressed against the distal end side (lower end in fig. 2) of the holder a by a coil spring (second elastic member) 13.

A second stopper ring 14 for restricting the movement of the second sleeve 11 in the distal direction is provided below the body portion 1B where the second sleeve 11 is disposed. The second stopper ring 14 is locked by a locking recess 1k (see fig. 7) formed in the outer peripheral surface of the body 1B, and is fixed at this position in the axial direction.

An enlarged diameter portion 11a for accommodating the coil spring (second elastic member) 13 is formed on the inner periphery of the base end portion of the second sleeve 11, and an enlarged diameter portion 11b for accommodating a part of the locking member 15 is formed on the inner periphery of the tip end portion. The diameter-enlarged portion 11b formed on the inner periphery of the distal end portion has a second cam surface. The non-diameter-expanded portion 11c located at the center between the diameter-expanded portion 11a and the diameter-expanded portion 11b is formed as a first cam surface. That is, when the locking member 15 abuts against the enlarged diameter portion 11B, the protruding portion of the locking member 15 that protrudes from the outer peripheral surface 1a of the body portion 1B is received, and when the locking member 15 abuts against the non-enlarged diameter portion 11c, the locking member 15 is pressed inward and the locking member 15 protrudes from the inner peripheral surface of the body portion 1B.

The coil spring 13 is disposed in a state where its inner circumference is along the outer circumferential surface 1a of the arbor body 1 and its outer circumference is substantially along the inner circumference of the enlarged diameter portion 11b of the second sleeve 11.

A first sleeve 20 having a coolant passage hole 20p is provided in the shank attachment hole 2 so as to be freely movable in the hole length direction (axial direction). A first stopper ring 21, which is a stopper member for restricting further downward movement of the first sleeve 20, is provided below the shank attachment hole 2 in which the holding hole 1g is formed. The first sleeve 20 is biased in the distal direction by a coil spring (first elastic member) 22 disposed at the proximal end thereof.

As shown in fig. 8 in an enlarged manner, the first stopper ring 21 has an inner diameter R1 having a minimum diameter smaller than an outer diameter R1 of a base end of a shank 30 described later, an outer diameter R2 having a maximum diameter larger than an outer diameter R2 of a locking recess described later in a state where no external force is applied, and a wavy annular shape in which a part bulges outward in an outer diameter side with respect to a virtual perfect circle and the other part is retracted in a plan view. The first stopper ring 21 is made of an elastic member such as spring steel, and at least its inner peripheral portion is deformed in the thickness direction by the abutment of the tip end of the shank 30, thereby enabling the inner diameter dimension to be enlarged.

The first stopper ring 21 is locked in the locking recess 1k (see fig. 7) provided on the inner peripheral surface of the shank attachment hole 2 over the entire circumference thereof, and fixed at the position. The first sleeve 20 is slidable in the shank attachment hole 2 in a state where an outer peripheral surface thereof is substantially in contact with an inner peripheral surface of the shank attachment hole 2, and the outer peripheral surface is capable of pushing out the locking member 15 to an outer diameter side.

The coil spring 22 has a tip end held by a receiving seat formed on a base end surface (upper end surface) of the first sleeve 20, and a base end held by a receiving seat formed on an upper end surface of the shank attachment hole 2.

A pressing portion 20t capable of pressing the valve body 5 from the tip end to the base end is provided in a central portion of the upper end surface of the first sleeve 20 in a protruding manner, and the first sleeve 20 can press the valve body 5 to move toward the base end side in a state of moving toward the base end side in the shank attachment hole 2.

In the present embodiment, the first sleeve 20 has a function as a valve body operating member capable of pressing the valve body 5 in order to separate the valve body 5 from the O-ring 4, but as in embodiment 3 described later, a structure (function) as the valve body operating member may be eliminated from the first sleeve 220 as another embodiment. The detailed structure of the other embodiment is described in detail in embodiment 3 described later.

As shown in fig. 2 or 4, in a state where the shank 25 of the tool C is not inserted into the shank attachment hole 2 of the holder a, the first sleeve 20 is brought into a state where the tip thereof abuts against the first stopper ring 21 by the coil spring 22, and the locking member 15 is pushed out to the outer diameter side of the holding hole 1g by the outer peripheral surface. In this state, since the outer diameter end of the locking member 15 protrudes radially outward from the outer peripheral surface 1a of the body 1B, the locking member 15 is positioned in the enlarged diameter portion (second cam surface) 11B of the second sleeve 11, and the second sleeve 11 is prevented from moving downward by the locking member 15. In this state, the coil spring 13 is compressed.

The shank 30 of the tool C inserted into the shank attachment hole 2 of the holder a has the following configuration. That is, the outer diameter of the shank 30 is formed to have a size substantially equal to (more precisely, a slightly smaller size than) the inner diameter of the shank attachment hole 2, and as shown in fig. 4, the outer peripheral edge of the base end of the shank 30 is chamfered (tapered) so that the outer diameter of the base end becomes smaller than the minimum diameter portion of the inner periphery of the first stopper ring 21. The chamfered portion is denoted by reference numeral 33 in fig. 4.

Recesses 31 for receiving a part of the locking member 15 are formed at a plurality of positions (three positions in the present embodiment) spaced apart from each other in the circumferential direction from a position slightly closer to the distal end side than the proximal end of the shank 30. The pitch of the circumferential arrangement is equal to the pitch of the circumferential arrangement of the locking members 15. However, the arrangement pitch of the plurality of positions may be 1/2 or 1/4 of the arrangement pitch of the locking members 15.

The recess 31 is formed in an elongated hole shape in the longitudinal direction (axial direction) of the cutter C so as to be movable in the axial direction even in a state where a part of the locking member 15 is housed. In this embodiment, the major diameter of the concave portion 31 is about 2 to 3 times the minor diameter. However, the amount of movement of the valve element 5 is not limited to this value, and may be, for example, 1.5 to 4 times or 1.3 to 6 times, as needed.

As shown in fig. 4 and the like, the tool C in the present embodiment is constituted by a tool body 40 and a mounting member 41 integrally mounted on the upper end thereof for mounting to the holder a, but it is needless to say that these may be physically constituted as one tool C.

The type of the cutter C may be a hollow cutter as in the present embodiment, or may be a type other than a hollow cutter.

With the present shank attachment structure configured as described above, the shank 30 of the tool C can be attached to and detached from the shank attachment hole 2 of the holder a as follows, and the coolant can be supplied to the tip of the tool C through the interior of the holder a during insertion in a state where the shank 30 is attached to the shank attachment hole 2. That is, as shown in fig. 4, when the tool C is to be attached (inserted) to the holder a, the tool C is inserted into the shank attachment hole 2 in a state where the shank 30 of the tool C is aligned with the shank attachment hole 2 of the holder a. In this insertion process, when the base end of the tool C abuts against the stopper ring 21, the chamfered portion 33 of the tool C can deform (expand) the stopper ring 21, and thus the shank 30 can be further inserted into the shank attachment hole 2. When the sleeve is inserted in this manner, the first sleeve 20 is moved toward the proximal end side by the abutment of the proximal end of the shank 30, and the locking member 15 is moved from the outer peripheral surface of the first sleeve 20 to the outer peripheral surface of the shank 30. When the locking member 15 enters the recess 31 of the shank 30, the locking member 15 moves inward, and the locking member 15 protrudes from the outer peripheral surface 1a of the body 1B and is pulled inward. As a result, the second sleeve 11 biased to the front end by the coil spring 13 moves in the front end direction. In this state, the non-diameter-expanded portion 11c which is the first cam surface of the second sleeve 11 holds the locking member 15 in a state of being moved radially inward. Therefore, as shown in fig. 5, the tool C is locked by the holder a via the locking member 15, and as a result, the tool C is integrally held on the holder a side.

In this state, the tip of the tool C is in contact with the surface to be cut, and when the tool C is further pressed from the base end side, the shank 30 of the tool C is further inserted into the shank attachment hole 2 of the holder a, and as shown in fig. 6, the first sleeve 20 is further moved to the base end side in the shank attachment hole 2, and the pressing portion 20t of the first sleeve 20 moves the valve body 5 to the base end side. In this state, the shank attachment hole 2 communicates with the first coolant supply passage 7. Therefore, the coolant is supplied to the tip end of the tool C through the first coolant supply passage 7, the shank attachment hole 2, and the coolant passage hole 20 p.

In the case of the present shank attachment structure, when the coolant supply amount is not appropriate, by adjusting the flow rate adjuster 16, that is, by rotating the adjustment knob 16D in the clockwise direction or the counterclockwise direction, the gap 16A between the inner peripheral surface of the hole 16B and the outer peripheral surface of the core member 16A can be changed, and an appropriate amount of coolant suitable for the cutting situation can be supplied. Specifically, the clearance 16A can be formed in accordance with the adjustment amount as shown in fig. 9 from a state in which the inner peripheral surface of the hole 16B is in close contact with the outer peripheral surface of the core member 16A and the clearance 16A is not formed as shown in fig. 10.

When the tool C is detached from the arbor a, the locking member 15 is brought into a state in which the locking member 15 can move radially outward by sliding the second sleeve 11 toward the base end side with respect to the body portion 1B, and in this state, the tool C is pushed from the base end side by the extension force of the coil spring 22, and as a result, the locking member 15 is pushed radially outward. As a result, the locking state between the tool C and the arbor a is released, and the tool C can be easily removed from the arbor a.

(example 2)

In embodiment 1, the first stopper ring 21 for restricting the first sleeve 20 from moving too far to the front end side is provided on the front end side of the first sleeve 20, but instead of this configuration, a configuration as in embodiment 2 shown in fig. 11 may be provided.

That is, in example 2, the base end portion of the first sleeve 120 is provided with a projection 1201r whose diameter is increased toward the outer diameter side over the entire circumference, and the third sleeve 140 is detachably attached to the inside of the body portion 101B, and the third sleeve 140 is provided with the coolant supply hole 103 on the inner diameter side and the projection 103r protruding toward the inner diameter over the entire circumference on the inner circumference side of the tip end. A stopper ring 140A is provided on the tip end side of the projection 1201r of the first sleeve 120 so that the first sleeve 120 does not protrude from the shank attachment hole 102 of the body 101B toward the tip end side. A stepped portion 140a having a diameter increased is formed on the inner peripheral surface of the base end of the third sleeve 140, and the coolant is sealed between the stepped portion 140a and the valve body 105 by providing the O-ring 104 on the stepped portion 140 a.

This structure is slightly more complicated in structure than the shank attachment structure of the structure of example 1, but is superior in durability. In fig. 11 showing embodiment 2, the same or corresponding configuration as that of embodiment 1 is given the same reference numeral as that of embodiment 1 plus 100, and redundant description is omitted.

(example 3)

In the above-described embodiments 1 and 2, spherical bodies are used as the valve bodies 5 and 105 in order to perform or stop the supply of the coolant from the coolant supply holes 3 and 103, but instead of this configuration, as shown in fig. 12 and 13, a cylindrical body shape having a valve seat surface 205a on the outer peripheral surface may be used as the valve body 205, the valve seat surface 205 having a tapered shape in which the diameter is different between the base end portion and the tip end portion and the intermediate portion is reduced in diameter on the tip end side. This structure also has substantially the same effects as those of the above-described embodiments 1 and 2 when supplying the coolant. That is, when the distal end of the large diameter portion 205B connected to the distal end of the cylindrical valve body 205 is further pressed by the proximal end of the shank 230 of the tool 200C being in contact with the proximal end of the shank, the valve body 205 is separated from the O-ring 204 provided at the distal end of the coolant supply hole 203, and the coolant can be supplied into the shank attachment hole 202 of the tool holder 200A from the gap s (see fig. 13) formed therebetween. In embodiment 3, the large diameter portion 205B functioning as a valve body operation member is formed integrally with the valve body 205 at a lower portion of the valve body 205. Therefore, in embodiment 3, unlike embodiments 1 and 2 described above, the function of the first sleeve 220 described later to be separated from the O-ring 204 without pressing the valve body 205 is eliminated. Instead of the structure of embodiment 3, a valve body operation member integrally formed with the valve body 205 may be separately provided.

In the shank attachment structure of embodiment 3, the coil spring is used as the first sleeve 220 in place of the first sleeves 20 and 120 of embodiments 1 and 2, and the locking member 215 can be pushed out to the outer diameter side by the coil spring. The coil spring constituting the first sleeve 220 also has the functions of the coil spring 22 in embodiment 1 and the coil spring 122 in embodiment 2. That is, when the tool 200C is removed, the tool 200C is pushed outward from the shank attachment hole 202 by the elastic force. This configuration is preferable in that the number of components can be reduced.

In fig. 12 and 13 showing embodiment 3, the same or corresponding configurations as or to those of embodiment 1 are given reference numerals of 200 added to those of embodiment 1, and redundant or substantially redundant description thereof is omitted.

The present invention is not limited to the embodiments 1 to 3, and can be implemented in various modifications within the scope of the same technical idea.

The shank attachment structure of the present invention can be used for attaching and detaching tools such as a drill press, a hand-held power drill, and a hammer drill.

Claims (9)

1. A shank attachment structure in which a locking member is disposed so as to protrude from an inner peripheral surface toward an inner radial side and so as to retreat from this state toward an outer radial side, and a shank on a tool side is attached to and detached from a shank attachment hole of a cylindrical shape in a one-touch manner, the shank attachment hole being provided so as to extend in an axial direction of a tool shank in a longitudinal direction of an inner hole of a tool shank body and so as to open at a tip end thereof to a distal end surface of the body, the shank on the tool side being provided at a base end thereof with a recess for receiving a part of the locking member,

a coolant supply hole having a tip end communicating with the shank attachment hole is formed in a radially central portion of the main body portion and adjacent to a base end of the shank attachment hole,

a valve body which is provided at a distal end portion of the coolant supply hole so as to be movable toward a base end side, and a seal member which is provided at a position of the coolant supply hole which is located at a distal end of the valve body and is in contact with the valve body so as to be capable of forming a liquid-tight state with the valve body,

a first sleeve is provided in the shank attachment hole such that a proximal end of the shank abuts a distal end of the first sleeve and moves toward a proximal end side in the axial direction, a pressing portion abuts the valve body by the movement to separate the valve body from the sealing member, and an outer peripheral surface having an outer diameter substantially equal to a diameter of the shank attachment hole is formed in a state where the shank does not abut a distal end of the first sleeve, so that the locking member is retracted from an inner peripheral surface of the shank attachment hole toward an outer diameter side,

a pressing portion that presses the valve body and separates the valve body from the seal member is disposed on the base end, and a valve body operating member having an abutment surface with which the stem portion abuts the tip end is disposed in the stem portion mounting hole.

2. The handle mounting structure of claim 1 wherein said first sleeve is integrally connected to said valve body operating member.

3. A shank attachment structure as recited in claim 1, wherein said valve body is integrally connected to said valve body operating member.

4. The shank attachment structure according to claim 1 or 2, wherein an outer diameter of the shank is formed in a size that the shank can be inserted into the shank attachment hole in a state where the locking member is retreated from an inner peripheral surface to an outer diameter of the shank attachment hole, and,

the recessed portion is formed in a long hole shape at the proximal end of the shank portion, and the shank portion is freely moved a predetermined distance in the axial direction of the tool holder in a state where a part of the locking member is accommodated in the recessed portion,

the first sleeve separates the valve body from the seal member in a state where the locking member is located at a front end position of the long-hole shank recess, and does not separate the valve body from the seal member in a state where the locking member is located at a base end position of the long-hole shank recess.

5. The shank attachment structure according to claim 1 or 2, wherein a locking recess is formed annularly in a circumferential direction of the shank attachment hole at a front end position of the shank attachment hole adjacent to a front end of a moving region in the axial direction of the first sleeve, and a retainer ring member is disposed in the locking recess, the retainer ring member comprising: the minimum diameter portion has an inner diameter slightly smaller than an outer diameter of the base end of the shank and an outer diameter larger than an outer diameter of the recess in a free state, and has a wavy annular shape in which one portion bulges outward in an outer diameter direction and the other portion is retracted with respect to a virtual perfect circle, and the portion bulging outward in the outer diameter direction is deformable in an axial direction of the shank attachment hole,

a chamfered portion is provided over the entire circumference of the base end outer periphery of the shank portion, and the outer diameter of the leading end of the chamfered portion is smaller than the diameter of the smallest diameter portion of the collar member.

6. The shank attachment structure according to claim 5, wherein a wall thickness of a portion of the body portion where the locking member is disposed is set smaller than a dimension of the locking member in a thickness direction of the wall, and,

the first sleeve has a holding hole formed in the wall portion in a direction orthogonal to the axial direction, the holding hole having an inner diameter side end opening to an inner peripheral surface of the shank attachment hole in a movement region of the shank attachment hole in the axial direction and an outer diameter side end opening to an outer peripheral surface of the wall portion,

a first elastic member is disposed at a proximal end of the first socket in the shank attachment hole so that a distal end of the first socket is urged in contact with the stopper member,

a second sleeve having a first cam surface and a second cam surface on an inner peripheral surface is provided on an outer periphery of the body portion, the second sleeve is movable in either one of the axial direction of the distal end or the axial direction of the cutter bar, and in a state of being moved in the one direction, a first cam surface projecting inward in the radial direction is capable of pressing the locking member in the holding hole toward the radial direction, and in a non-moved state, the second cam surface can accommodate the locking member to an outer diameter side, the second sleeve is pressed in the one direction by an elastic force of a second elastic member accommodated in an inner periphery of a base end portion of the second sleeve, and a state is formed in which a part of the locking member is accommodated in the recess portion of the shank portion, the second sleeve is maintained in the non-moving state against the elastic force of the second elastic member, so that the locking member can be configured to retreat toward the outer diameter side in the holding hole.

7. The shank attachment structure according to any one of claims 1, 2, and 6, wherein a first coolant supply passage having a tip end communicating with the coolant supply hole and a base end exposed to an outer peripheral surface of the main body portion is formed in the main body portion of the tool holder,

a fixing member is disposed on an outer periphery of the body portion, the fixing member including: a second coolant supply passage having an annular passage opening to an inner peripheral surface, and a third coolant supply passage having a distal end communicating with a proximal end of the second coolant supply passage and a proximal end exposed to an outer periphery, and having a cylindrical main body holding hole rotatably supporting the main body from an outer peripheral side, the fixing member being disposed in a state in which the proximal end of the first coolant supply passage communicates with the distal end of the second coolant supply passage,

a coolant flow rate adjusting mechanism capable of changing the passage cross section of the third coolant supply passage is provided in the third coolant supply passage of the fixing member.

8. The handle mounting structure of claim 7 wherein the flow adjustment mechanism comprises: a tapered hole portion formed in the third coolant supply passage, a tapered core member having an outer shape corresponding to the tapered hole, and a screw mechanism provided so that the tapered core member can be moved toward and away from the tapered hole portion.

9. The shank attachment structure according to any one of claims 1, 2, 6, 8, wherein the valve body is a ball, and the seal member is an O-ring constituted by an elastic member, the ball being urged toward the seal member side by a coil spring.