KR101626455B1 - Oscillating saw device - Google Patents

Abstract

An oscillating saw apparatus is disclosed. The disclosed oscillating saw apparatus comprises i) a main body of a gun shape, ii) a driving motor installed in the main body, iii) a rotating element, connected directly to the driving motor, and having three cam protrusions formed on the rotating element A power transmitting unit, iv) an operating member rotatably mounted to the main body in the left-right direction and selectively in cam contact with the cam protrusions, and v) a power transmitting rotational power of the driving motor to the operating member via the power transmitting unit And a saw which is positioned on a straight line with the transmission path and is fixedly mounted to the operation member.

Description

[0001] OSCILLATING SAW DEVICE [0002]

An embodiment of the present invention relates to an oscillating saw apparatus, and more particularly to a surgical oscillating saw apparatus used for cutting or cutting a bone in an orthopedic surgery.

In general, a surgical medical instrument used in surgical operations is an oscillating saw apparatus and a drilling apparatus for cutting and cutting bones, drilling holes in bones, and inserting pins.

Among these, Oscillating Saw (Oscillating Saw) is a type of medical handpiece, which is widely used for orthopedic surgery and bone cutting through saw.

In particular, oscillating sawing devices are used for cutting bones in knee artificial joints and hip joint replacement (hip joint) replacement. Such an oscillating sowing apparatus for surgical operation is mainly composed of an automatic method for cutting bone by rotating the sow in a leftward and rightward direction by a driving means such as a motor.

For example, a surgical oscillating saw apparatus is constituted by a gun-shaped body having an operation button like an electric power tool, and the bone can be cut by repeatedly rotating the saw in the lateral direction through the driving means.

Such an oscillating saw apparatus is provided with driving means as a motor installed in the main body, power transmitting means for transmitting rotational power of the driving means, switching means for switching the rotational motion of the driving means to the right and left repeated rotational motion And a fastening means connected to the direction switching means and fastening the saw.

Therefore, the oscillating saw apparatus transmits the rotational power of the driving means to the direction switching means through the power transmitting means, and by switching the rotational motion of the driving means to the right and left repeated rotational motions through the direction switching means, Rotate and cut the bone.

Here, when the oscillating saw is based on the power transmission path for transmitting the rotational power of the drive means to the direction switching means through the power transmission means, the saw is not located on the straight line of the power transmission path.

That is, the saw is connected to the direction switching means through the fastening means at a certain distance from the power transmission path in the direction perpendicular to the power transmission direction (horizontal direction), is spaced apart from the direction switching means by a certain distance, have.

Thus, in the conventional oscillating saw apparatus, the saw is not located on the straight line of the power transmission path but fixed at a certain distance in the vertical direction with respect to the direction switching means. Therefore, when cutting the bone from the bottom to the top, It may cause discomfort such as turning over.

Further, in the related art, as described above, since the saw is connected to the direction switching means through the fastening means at a certain distance from the power transmission path in the direction perpendicular to the power transmission direction, noise and vibration may occur during repeated left and right rotation of the saw Which is disadvantageous to power transmission efficiency, and the overall structure and assembling work is complicated, and the manufacturing cost may increase due to an increase in the number of parts.

(Patent Document 1) Korean Published Patent Application No. 2014-0004883 (published on April 14, 2014)

The matters described in the background section are intended to enhance the understanding of the background of the invention and may include matters not previously known to those skilled in the art.

Embodiments of the present invention are to provide an oscillating saw apparatus capable of implementing power transmission of a saw in a serial system by providing a saw to a path for transmitting power and a straight line.

An oscillating saw according to an embodiment of the present invention comprises: i) a main body of a gun shape; ii) a drive motor installed in the main body; iii) a rotary element connected directly to the drive motor, A power transmitting unit having three cam protrusions formed on the element; iv) an operating member rotatably installed to the body in the left and right direction and selectively in cam contact with the cam protrusions; and v) And a saw which is disposed on a straight line with the power transmission path for transmitting power to the operation member via the power transmission unit and is fixed to the operation member.

In addition, the oscillating saw according to an embodiment of the present invention may further include a fixing unit installed on the operation member and fixing the saw to the operation member.

Further, in the oscillating saw apparatus according to the embodiment of the present invention, the operating member and the fixing unit may be positioned on a straight line.

Also, in the oscillating saw according to the embodiment of the present invention, the driving motor, the power transmitting unit, the operating member, and the fixing unit may form a series power transmission system along the longitudinal direction of the main body.

Also, in the oscillating saw apparatus according to the embodiment of the present invention, the power transmitting unit may include a planetary gear set connected to a drive shaft of the drive motor.

The planetary gear set may include a sun gear coupled to a driving shaft of the driving motor and a sun gear disposed circumferentially outside the sun gear, A plurality of planetary gears meshing with and meshing with the planetary gears, and a planetary carrier connected to the planetary gears as the rotational elements and rotatably supporting the planetary gears at equal intervals have.

Further, in the oscillating saw according to the embodiment of the present invention, the planetary carrier is formed in a triangular shape, and the cam protrusion can be formed at each vertex.

Further, in the oscillating saw according to the embodiment of the present invention, the cam protrusions have a rounded cam protruding surface and protrude from the respective vertexes of the planetary carrier so as not to cross each other with respect to the center of the sun gear .

Further, in the oscillating saw according to the embodiment of the present invention, the cam protrusions may be cam-contacted alternately on the right and left sides of the actuating member.

In addition, in the oscillating saw according to the embodiment of the present invention, the saw may be slidably installed on the operating member along the power transmission path by the fixing portion.

In addition, in the oscillating saw according to the embodiment of the present invention, the actuating member may include a chucking groove for supporting an engagement end of the saw, It can be installed as much as possible.

Further, in the oscillating saw according to an embodiment of the present invention, a detachment groove may be formed along the power transmission path at an engagement end of the saw.

Further, in the oscillating saw according to the embodiment of the present invention, the fixing portion includes a support plate for supporting an engagement end portion of the saw, which is fitted in a chucking groove of the operation member, A fastening bolt which is inserted through the member and a butterfly nut which is fastened to the fastening end of the fastening bolt.

Further, in the oscillating saw according to the embodiment of the present invention, the saw is slid along the power transmission path between the support plate and the operating member, and is detached from the fastening bolt through the fastening bolt, Can be mounted.

Further, in the oscillating saw according to the embodiment of the present invention, the fixing portion may further include a spring washer interposed between the head of the fastening bolt and the support plate, and between the operating member and the butterfly nut have.

In addition, the oscillating saw according to the embodiment of the present invention may further include a pair of return springs connected to the operating member and the main body, respectively, and exerting an elastic force in a direction opposite to the left-right rotation of the operating member .

The embodiments of the present invention can implement the power transmission of the saw in a serial system by locating the fixed portion on a straight line with the power transmission path for transmitting the rotational power of the drive motor to the operation member through the power transmission unit.

Therefore, in the embodiment of the present invention, since the power transmission path and the saw tooth are located on one straight line, it is possible to solve the inconvenience of turning the body upside down when cutting the bone from the bottom up as in the prior art, Bones can be easily cut.

In addition, in the embodiment of the present invention, since the power transmission of the saw is performed in a serial system, the power transmission efficiency can be improved, the noise and vibration can be minimized, the number of parts can be reduced, .

Furthermore, in the embodiment of the present invention, since the saw can be detached from the operation member in a sliding manner without disassembling the fixing portion for fixing the saw, the operation of separating and replacing the saw can be simplified and simplified.

In the embodiment of the present invention, by adopting the planetary gear set as the power transmitting unit, it is possible to minimize the noise and vibration generated during operation of the apparatus by dispersing the transfer load on the drive motor, It can be shifted easily.

These drawings are for the purpose of describing an exemplary embodiment of the present invention, and therefore the technical idea of the present invention should not be construed as being limited to the accompanying drawings.
1 is an exploded perspective view illustrating an oscillating saw according to an embodiment of the present invention.
2 is an exploded perspective view illustrating an oscillating saw according to an embodiment of the present invention.
3 is a front view showing an oscillating saw according to an embodiment of the present invention.
4 is a cross-sectional view illustrating a saw-toothed structure of an oscillating saw according to an embodiment of the present invention.
5 and 6 are views for explaining the operation of the oscillating saw according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In order to clearly illustrate the present invention, parts not related to the description are omitted, and the same or similar components are denoted by the same reference numerals throughout the specification.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

In the following detailed description, the names of components are categorized into the first, second, and so on in order to distinguish them from each other in the same relationship, and are not necessarily limited to the order in the following description.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise.

It should be noted that terms such as " ... unit ", "unit of means "," part of item ", "absence of member ", and the like denote a unit of a comprehensive constitution having at least one function or operation it means.

FIG. 1 is an exploded perspective view illustrating an oscillating saw according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a frontal view of FIG.

1 to 3, an oscillating saw apparatus 100 according to an embodiment of the present invention is a medical instrument for orthopedic surgery, and can be used to precisely cut or cut a bone.

For example, the oscillating saw apparatus 100 is used for cutting a bone in an artificial joint of the knee and a hip joint (hip joint) by repeatedly rotating a saw blade having a saw blade in a lateral direction of a predetermined section by an electric power.

It should be understood, however, that the scope of protection of the present invention is not necessarily limited thereto, and any kind of cutting apparatus for cutting a predetermined object by the sawing method as described above can be applied to the technical idea of the present invention have.

The oscillating saw apparatus 100 according to the embodiment of the present invention has a structure in which a power transmission path can be implemented in a serial system by providing a sawtooth in a straight line with a path for transmitting power.

That is, according to the embodiment of the present invention, the bone can be easily cut at any position, noise and vibration can be minimized, power transmission efficiency can be improved, the number of parts can be reduced, and the overall structure and assembly can be simplified (100). ≪ / RTI >

The oscillating saw apparatus 100 according to the embodiment of the present invention includes a main body 10, a driving motor 20, a power transmitting unit 30, an operating member 50 and a saw 60, The following is a description according to the constitution.

In the embodiment of the present invention, the main body 10 supports various components to be described below, and includes various kinds of components such as a bracket, a housing, a plate, a partition wall, a rib, a rail, a block, It contains the sub-elements.

However, since the above-described accessory elements are provided for installing various components according to the embodiment of the present invention, the above-mentioned accessory elements are collectively referred to as the main body 10 except for exceptional cases.

Here, the main body 10 is formed like a main body of a general power tool. The main body 10 is formed as a handle, and a handle 11 is formed. In the portion connected to the handle 11, Can be mounted.

The handle 11 is provided with a trigger switch 13 for applying an electrical signal to the drive motor 20, which will be described later.

In the embodiment of the present invention, the driving motor 20 is driven by receiving an electrical signal through the trigger switch 13, and is fixed to a portion of the main body 10 connected to the handle 11. The drive motor 20 is provided with a drive shaft 21 that is rotated by an electrical signal applied through a trigger switch 13.

In the embodiment of the present invention, the power transmission unit 30 is rotated by a drive motor 20 and transmits the rotational power of the drive motor 20 to an operation member 50 to be described later, (20) to the right and left repeated rotational motion of the operating member (50).

For example, the power transmitting unit 30 includes a planetary gear set 31 having a rotating element and directly connected to the driving motor 20. [

The planetary gear set 31 is provided as a transmission mechanism for reducing or increasing the rotational speed of the drive motor 20. [ The planetary gear set 31 can minimize the noise and vibration generated during operation of the apparatus 100 by dispersing the transfer load on the drive motor 20. [

The planetary gear set 31 includes a sun gear 33, planetary gears 35, a ring gear 37, and a planetary carrier 39. The sun gear 33 is coupled to the drive shaft 21 of the drive motor 20 and can be splined to the drive shaft 21.

The planetary gears 35 are arranged on the outer side of the sun gear 33 in the circumferential direction and meshed with the sun gear 33. The planetary gears 35 may be provided with three pinion gears which are engaged externally with the sun gear 33 and are in contact with and engaged with the ring gear 37.

The ring gear 37 is in contact with and meshed with the planetary gears 35. The planetary gears 35 are meshed with each other on the inner circumferential surface of the ring gear 37.

The planetary carrier 39 is connected to the planetary gears 35 as the aforementioned rotary element. The planetary carrier 39 rotatably supports the planetary gears 35 at equal intervals so that the planetary gears 35 simultaneously rotate and revolve between the sun gear 33 and the ring gear 37.

Here, the planetary carrier 39 rotatably supports three planetary gears 35 through a shaft, and may be formed in a triangle connecting the shafts.

This planetary gear set 31 is made up of a known planetary gear device employed in, for example, an overdrive device of an automobile, an automatic transmission, a longitudinal reduction gear device or a final reduction gear of a construction machine loader, Will not be described in detail.

The planetary gear set 31 according to the embodiment of the present invention is a means for converting the rotational motion of the driving motor 20 into the right and left repeated rotational motion of the operating member 50. The planetary gear set 31 includes a plurality of cam protrusions 41, .

The cam protrusions 41 are provided at three intervals (odd numbered) at intervals of 120 degrees. Each of the cam protrusions 41 protrudes from the planetary gear set 31 to the triangular vertex of the planetary carrier 39 corresponding to the operating member 50 . The cam protrusions 41 have a round cam protruding surface 42 and are disposed so as not to cross each other with respect to the center of the sun gear 33.

By forming the cam protrusion 41 at the triangular vertex of the planetary carrier 39 as described above, the wheel balance of the planetary carrier 39 due to the centrifugal force can be made zero to suppress the occurrence of vibration.

The reason why the three cam protrusions 41 are arranged so as not to be crossed with each other is that the cam protrusions 41 are formed by the driving motor 20 as the planetary carrier 39 of the planetary gear set 31 rotates, So as to alternately cam contact the left and right sides of the operation member 50 to be described later.

In the embodiment of the present invention, the operating member 50 is moved in the left-right direction by the cam protrusions 41 as the planetary carrier 39 of the planetary gear set 31 rotates by the drive motor 20, It is a repetitive rotation movement.

The operating member 50 is provided in the main body 10 so as to be rotatable in the left-right direction, in a cam-contacting manner with the cam protrusions 41 of the planetary carrier 39.

The operating member 50 is a plate having a width and a length corresponding to the diameter of the planetary gear set 31 and has a rounded cam contact surface 51 in cam contact with the cam protrusions 41 of the planetary carrier 39 ).

That is, as the planetary carrier 39 of the planetary gear set 31 is rotated by the drive motor 20, the cam protrusions 41 are alternately disposed on the left and right sides of the cam contact surface 51 It can be repeatedly rotated in the left and right direction for a predetermined interval by the cam contact.

The operating member 50 is rotatably supported on the main body 10 through a rotation center shaft 53 perpendicular to the transmission path of the power transmitted from the drive motor 20 through the planetary gear set 31 It can be installed as much as possible.

A chucking groove 55 is formed on the upper surface of the actuating member 50 to support the engaging end of the actuating member 50 in a shape corresponding to the engaging end of the saw 60 to be described later.

In an embodiment of the present invention, the saw 60 is cut by a sawing method, and is provided with a plate saw having a predetermined width and length.

One end of the saw 60 is an engaging end that is engaged with the chucking groove 55 of the actuating member 50 and can be fixed to the actuating member 50 through a fixing portion 70 which will be described later. At the other end of the saw 60, a saw blade 61 for cutting the bone is formed.

Here, a detachable groove 63 having a predetermined length is formed along the power transmission path at an engagement end (one end portion) of the saw 60. The assembly structure of the saw 60 using the detachable groove 63 will be described in more detail later.

The above-described saw 60 is positioned on a straight line with the power transmission path for transmitting the rotational power of the drive motor 20 to the operating member 50 via the planetary gear set 31, As shown in FIG. The saw 60 may be slidably installed on the operation member 50 along the power transmission path by the fixing unit 70, which will be described later.

To this end, in the embodiment of the present invention, the fixing member 70 is installed on the operation member 50 and fixes the saw 60 to the operation member 50.

The operating member 50 and the fixing portion 70 are disposed on a straight line so that the driving motor 20, the power transmitting unit 30, the operating member 50, And the fixing portion 70 may form a series power transmission system along the longitudinal direction of the main body 10. [

4 is a cross-sectional view illustrating a saw-toothed structure of an oscillating saw according to an embodiment of the present invention.

1 to 4, the fixing part 70 according to the embodiment of the present invention specifically includes a support plate 71, a fastening bolt 73, a butterfly nut 75 and a spring washer 77 do.

The support plate 71 is provided as a cover plate for supporting an engagement end of the saw 60 fitted in the chucking groove 55 of the operation member 50. The supporting plate 71 is fitted into the chucking groove 55 in a state where the engaging end of the saw 60 is fitted into the chucking groove 55 of the actuating member 50 and is engaged with the engaging end of the saw 60, And is disposed in close contact with the upper surface.

The support plate 71 is formed with a first through hole 79 through which a fastening bolt 73 passes. A second through hole 59 is formed in the chucking groove 55 of the actuating member 50 corresponding to the first through hole 79 so that the fastening bolt 73 penetrates through the chucking groove 55.

In this case, in the state where the engaging end of the saw 60 is inserted into the chucking groove 55 of the operating member 50 and the supporting plate 71 is closely contacted with the upper surface of the engaging end and inserted into the chucking groove 55, The first through-hole 79 of the base 71, the detachment groove 63 of the saw 60, and the second through-hole 59 of the actuating member 50 can be matched and connected to each other.

The fastening bolts 73 are coupled to the support plate 71 and the actuating member 50 through the attachment and detachment grooves 63 of the saw 60. The first and second through holes 79 ), The detachment groove (63), and the second through hole (59).

The butterfly nut 75 is a nut having a handle that can be fastened to a bolt by turning with a finger, and the handle is formed as a wing of a butterfly. The butterfly nut 75 is fastened to a through end of a fastening bolt 73 passing through the first through hole 79, the attaching groove 63 and the second through hole 59.

Therefore, in the embodiment of the present invention, the engaging end of the saw 60 is inserted into the chucking groove 55 of the actuating member 50, the supporting plate 71 is brought into close contact with the upper surface of the engaging end, A fastening bolt 73 is inserted into the first through hole 79, the attaching groove 63 and the second through hole 59 which are connected to each other in a state in which the fastening bolts 73 are fastened to each other, When the nut (75) is fastened, the saw (60) can be fixed to the operating member (50).

When the tightening of the butterfly nut 75 is released in the above state, the saw 60 is slid along the power transmission path between the support plate 71 and the operating member 50, And can be detached from the operation member 50. [0051] As shown in FIG.

The saw 60 or other saw 60 is moved along the power transmission path between the support plate 71 and the operating member 50 with the saw 60 separated from the operating member 50 as described above. And can be mounted on the fastening bolt (73) through the detachment groove (63) while being slidably engaged with the operation member (50).

The spring washer 77 is provided as a wave washer for increasing the fixing force of the saw 60 to the operation member 50 and forming a wave along the arc direction.

The spring washer 77 is interposed between the head of the fastening bolt 73 and the support plate 71 and between the actuating member 50 and the butterfly nut 75, respectively. The spring washer 77 is elastically deformed by the tightening force of the butterfly nut 75 and the elastic force of the spring washer 77 can firmly fix the engagement end of the saw 60 to the operation member 50. [

In the embodiment of the present invention, as the planetary carrier 39 of the planetary gear set 31 is rotated by the drive motor 20, the cam protrusions 41 of the planetary carrier 39 are engaged with the operation member 50, Further comprising a pair of return springs 90 that exert an elastic force in a direction opposite to the left-right rotation of the operating member 50 when the operating member 50 is selectively rotated in the left-right direction.

That is, the return spring 90 exerts an elastic force in the direction opposite to the left-right rotation when the operating member 50 is repeatedly rotated in the left-right direction so that the operating member 50 is brought into close contact with the cam protrusion 41 of the planetary carrier 39 Noise and shock / vibration can be suppressed.

When the driving motor 20 stops operating, the return spring 90 exerts an elastic force in the direction opposite to the left-right rotation of the operating member 50 to rotate the planetary carrier 39 through the cam protrusion 41 of the planetary carrier 39, And also idles the saw 60 to position the saw 60 in line with the power transmission path.

One end portion of the return spring 90 is connected to the rotation center shaft 53 of the actuating member 50 or the upper and lower portions of the body of the actuating member 50 And the other end is connected to one side and the other side of the main body 10, respectively.

That is, the return spring 90 provides an elastic force acting on the operation member 50 in the right direction when the operation member 50 is rotated to the left, 50 in the left direction.

Hereinafter, the operation of the oscillating saw 100 according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings and the accompanying drawings.

5 and 6 are views for explaining the operation of the oscillating saw according to the embodiment of the present invention.

5 and 6, in the embodiment of the present invention, the engaging end of the saw 60 is inserted into the chucking groove 55 of the actuating member 50, and the upper surface of the engaging end The support plate 71 of the fixing part 70 is closely contacted and fitted into the chucking groove 55.

The first through hole 79 of the support plate 71, the attachment / detachment groove 63 of the saw 60 and the second through hole 59 of the operation member 50 are connected to each other.

In this state, in the embodiment of the present invention, the fastening bolts 73 are coupled to the first through holes 79, the attaching grooves 63 and the second through holes 59, Tighten the butterfly nut (75).

In this case, a spring washer 77 is interposed between the head of the fastening bolt 73 and the support plate 71, and between the actuating member 50 and the butterfly nut 75, respectively.

The one end portion (engagement end portion) of the saw 60 is fixed to the operation member 50 by the tightening force of the butterfly nut 75 fastened to the fastening bolt 73 between the support plate 71 and the operation member 50, As shown in FIG.

Since the spring washer 77 is interposed between the head of the fastening bolt 73 and the support plate 71 and between the actuating member 50 and the butterfly nut 75 in the embodiment of the present invention, The engaging end portion of the saw 60 can be more firmly fixed to the operating member 50 as an elastic force of the spring washer 77 elastically deformed by the tightening force of the butterfly nut 75. [

In this state, in the embodiment of the present invention, an electric signal is applied to the driving motor 20 through the trigger switch 13 of the main body 10 during orthopedic surgery.

Then the sun gear 33 of the planetary gear set 31 is rotated in one direction by the drive shaft 21 and the sun gear 33 of the planetary gear set 31 is rotated in one direction, The gears 35 rotate between the sun gear 33 and the ring gear 37 while simultaneously rotating and revolving.

The planetary carrier 39 supporting the planetary gears 35 is also rotated together with the planetary gears 35 at a predetermined rotation speed.

As the planetary carrier 39 of the planetary gear set 31 is rotated by the drive motor 20, the cam protrusions 41 of the planetary carrier 39 are engaged with the cam contact surfaces 51 of the operating member 50 , The operation member 50 is rotated in the left and right direction for a predetermined interval.

That is, in the embodiment of the present invention, as shown in FIG. 5, the planetary carrier 39 rotates and one of the cam protrusions 41 is brought into cam contact with the left side of the operation member 50, And can be rotated in the right direction about the central axis 53 by a predetermined interval.

6, the planetary carrier 39 rotates and the other cam projection 41 is brought into cam contact with the right side of the operation member 50 to rotate the operation member 50 And can be rotated in the left direction about the central axis 53 by a predetermined interval.

Therefore, in the embodiment of the present invention, as the planetary carrier 39 of the planetary gear set 31 is rotated by the drive motor 20, the cam protrusions 41 of the planetary carrier 39 are engaged with the operation member 50, So that the operation member 50 can be repeatedly rotated in the left and right direction for a predetermined period of time.

Thus, in the embodiment of the present invention, since the saw 60 is fixed to the operating member 50 through the fixing portion 70, the saw 60 is rotated in the left-right direction together with the operating member 50, As shown in Fig.

In the embodiment of the present invention, when the operation member 50 is repeatedly rotated in the lateral direction as described above, the elastic force acting in the counterclockwise rotation direction of the operation member 50 through the return spring 90 is transmitted to the operation member 50).

Thus, in the embodiment of the present invention, the actuating member 50 is provided with an elastic force acting in the counterclockwise rotation direction through the return spring 90 when the actuating member 50 is repeatedly rotated in the left-right direction, It is possible to suppress the occurrence of noise and vibration due to the impact of the cam protrusions 41 and the actuating member 50 by bringing the cam protrusions 41 and the planetary carrier 39 into close contact with the cam protrusions 41 of the planetary carrier 39.

In the embodiment of the present invention, when the driving motor 20 is stopped, the elastic force is applied to the operating member 50 through the return spring 90 in the direction opposite to the left-right rotation thereof, The planetary carrier 39 can idly rotate the planetary carrier 39 through the planetary carrier 41 to position the saw 60 in line with the power transmission path.

On the other hand, when the operation is completed and the saw 60 is to be separated from the operating member 50, the fastening of the butterfly nut 75 is released in the embodiment of the present invention.

The fixing force acting on the engagement end of the saw 60 between the support plate 71 and the actuating member 50 is released so that in the embodiment of the present invention, (60) can be slid along the power transmission path and separated from the operation member (50).

That is, the saw 60 is slid along the power transmission path between the support plate 71 and the operating member 50 and is detached from the fastening bolt 73 through the detachment groove 63 and separated from the operating member 50 .

In the case where another saw 60 is to be attached to the actuating member 50 while the saw 60 is separated from the actuating member 50 as described above, The saw 60 is slid along the power transmission path between the members 50 and mounted on the fastening bolt 73 through the detachment groove 63.

Thereafter, when the butterfly nut 75 is tightened, the engagement end of the saw 60 can be firmly fixed to the operation member 50 as described above.

According to the oscillating saw apparatus 100 according to the embodiment of the present invention as described above, the power transmission path for transmitting the rotational power of the drive motor 20 to the operation member 50 through the power transmission unit 30 The power transmission of the saw 60 can be realized in a serial system by positioning the fixed portion 70 on a straight line.

Therefore, in the embodiment of the present invention, since the power transmission path and the saw 60 are disposed on a straight line, the inconvenience such as turning the main body upside down when cutting the bone from the bottom to the top is eliminated The bones can be easily cut at any position.

In addition, in the embodiment of the present invention, since power transmission of the saw 60 is implemented in a serial system, power transmission efficiency can be improved, noise and vibration can be minimized, the number of parts can be reduced, Assembly can be simplified.

Furthermore, in the embodiment of the present invention, since the saw 60 can be detached from the operation member 50 in a sliding manner without disassembling the fixing unit 70 for fixing the saw 60, Can be simplified and simplified.

In the embodiment of the present invention, by adopting the planetary gear set 31 as the power transmitting unit 30, the transmission load to the drive motor 20 is dispersed, And the rotational speed of the drive motor 20 can be easily changed.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Other embodiments may easily be proposed by adding, changing, deleting, adding, etc., but this is also within the scope of the present invention.

10 ... main body 11 ... handle portion
13 ... Trigger switch 20 ... Drive motor
21 ... drive shaft 30 ... power transmission unit
31 ... planetary gear set 33 ... sun gear
35 ... planetary gear 37 ... ring gear
39 ... planetary carrier 41 ... cam projection
42 ... cam protruding surface 50 ... operating member
51 ... cam contact surface 53 ... rotation center axis
55 ... chucking groove 59 ... second through hole
60 ... saw 61 ... saw blade
63 ... detachable groove 70 ... fixed portion
71 ... support plate 73 ... fastening bolt
75 ... butterfly nut 77 ... spring washer
79 ... first through hole 90 ... return spring

Claims (14)

A gun-shaped main body;
A drive motor installed in the main body;
A power transmitting unit having a rotating element and connected directly to the driving motor and having three cam protrusions formed on the rotating element;
An operation member rotatably installed in the body in the left and right direction and selectively in cam contact with the cam protrusions; And
And a saw which is positioned on a straight line with a power transmission path for transmitting rotation power of the drive motor to the operation member through the power transmission unit and fixed to the operation member,
Wherein the power transmission unit includes a planetary gear set that is connected to a drive shaft of the drive motor,
The planetary gear set includes a sun gear coupled to a drive shaft of a drive motor, a plurality of planetary gears arranged circumferentially outside the sun gear and meshing with the sun gear, And a planetary carrier connected to the planetary gears as the rotational elements and rotatably supporting the planetary gears at equal intervals,
Wherein the planetary carrier is formed in a triangular shape and the cam protrusions are formed at respective vertexes of the planet carrier, the cam protrusions having a rounded cam projection surface, Projecting from each of the vertexes, alternately cam-contacting the right and left sides of the actuating member,
Wherein the actuating member is provided with a plate having a width and a length corresponding to the diameter of the planetary gear set and forms a rounded cam contact surface in cam contact with the cam protrusions of the planet carrier. Device. The method according to claim 1,
Further comprising a fixing portion which is provided on the operation member and fixes the saw to the operation member,
Wherein the actuating member and the securing portion are positioned in a straight line. 3. The method of claim 2,
Wherein the drive motor, the power transmission unit, the operation member, and the fixing unit form a series power transmission system along the longitudinal direction of the main body. delete delete delete delete 3. The method of claim 2,
The saw-
And the slider is slidably mounted on the operating member along the power transmission path by the fixing portion. 3. The method of claim 2,
Wherein:
And a chucking groove for supporting a joint end of the saw, and is rotatably installed on the main body through a rotation center axis perpendicular to the power transmission path. 10. The method of claim 9,
Wherein the attachment end of the saw is formed with a detachment groove along the power transmission path. 11. The method of claim 10,
The fixing unit includes:
A support plate for supporting an engagement end of the saw fitted in the chucking groove of the actuating member,
A fastening bolt penetrating through the support plate and the operation member through a detachment groove of the saw,
And a fastening bolt
Wherein the oscillating saw apparatus comprises: 12. The method of claim 11,
The saw-
Wherein the sliding member is slid along the power transmission path between the support plate and the operation member and is detached from the fastening bolt through the fastening groove or mounted on the fastening bolt. 12. The method of claim 11,
The fixing unit includes:
Further comprising a spring washer interposed between the head of the fastening bolt and the support plate, and between the actuating member and the butterfly nut. The method according to claim 1,
Further comprising a pair of return springs connected to the operating member and the main body, each of the return springs exerting an elastic force in a direction opposite to the left-right rotation of the operating member.

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