JP2501121Y2 - Reciprocating - Google Patents

Description

[Detailed description of the device]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating saw that performs a cutting operation by reciprocating a saw blade.

[Prior art]

As a tool for cutting wood and metal, there is one called a reciprocating saw. As disclosed in Japanese Utility Model Laid-Open No. 60-75002, the rotary motion of the motor is converted into a reciprocating motion to cause the sawtooth blade to reciprocate. At this time, the sawtooth blade reciprocates. In order to easily guide the movement, in this type, a plunger slidable in the axial direction is provided, and a saw blade is attached to this plunger. When a plunger having a circular cross section is used so that the plunger can be easily supported for axial movement, a detent member for stopping rotation of the plunger about its axis is required. FIG. 6 shows a conventional detent structure, in which 4 is a plunger, 6 is a bearing stand having bearings 12 for supporting the plunger 4 at both ends, and the bearing stand 6 has a plunger. Guide parts 62, 62 are provided on both sides of the guide member 4 in parallel with the plunger 4. A plate 46 is fixed to the plunger 4 by a fixing plate 47 and a screw 48, and both ends of the plate 46 are positioned on the guide portions 62, 62 to prevent the plunger 4 from rotating. .

[Problems to be solved by the device]

Here, as the bearing stand 6, an aluminum material is often used from the viewpoint of weight reduction and workability, but the metal plate 46 is a guide portion 62, 62 made of an aluminum material.
When sliding on the upper surface, the bearing stand 6 is worn, rattling of the plunger 4 about rotation about the axis occurs, the vertical support of the saw blade 5 becomes impossible, and cutting performance is deteriorated. Will significantly reduce the life of the bearing 12. In order to prevent this, as shown in FIG. 6, there is also a structure in which thin guide plates 63, 63 made of metal are respectively provided on the guide parts 62, 62 to prevent the bearing base 6 from being worn. However, even in this case, the grease that cannot be replenished to the bearing 12, which requires the most reliability, cannot be supplied, and if the initially filled grease is scattered, the possibility that the plunger will be burned becomes high. There is. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reciprocating saw having a high reliability with respect to a detent and a reciprocating axial support of the plunger.

[Means for Solving the Problems]

Thus, the present invention comprises a reciprocating plunger to which a saw blade is mounted and a drive device for reciprocating the plunger, and guide members arranged on both sides of the plunger in parallel with the plunger. With
In a reciprocating saw in which a plunger is provided with a detent member for stopping detents around the shaft of the plunger by arranging both ends on both guide members, a wear resistant reinforcing plate is provided on each of the guide members. The anti-rotation member is located on the reinforcing plate, and the reinforcing plates are integrally connected between the bearings provided on the bearing stand and supporting both ends of the plunger to form a grease reservoir. It has a special feature. [Operation] According to the present invention, the reinforcing plate prevents abrasion of the guide portion due to the sliding contact between the anti-rotation member and the guide portion, and the guide portions are disposed on the pair of guide portions located on both sides of the plunger. The portion that integrally connects the formed reinforcing plates functions as a grease reservoir. [Embodiment] Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments. In the drawings, reference numeral 1 denotes a housing in which a battery pack 9 is detachable, and a housing 1 in which a handle portion 15 is integrally formed.
A motor 2 and a gear box 10 are arranged inside, and a tip end of a plunger 4 which is reciprocally supported by bearings 12 arranged inside the gear box 10,
A clamp 40 to which the saw blade 5 is connected is provided. In the gear box 10, a pinion 21 fixed to an output shaft 20 of the motor 2, a shaft 24 supported by bearings 11, 11, and mounted on the shaft 24 via one-way clutches 13, 13, respectively. A pair of gears 22 and 23 are housed therein. Although the gear 23 is directly meshed with the pinion 21, the gear 22 is meshed with the pinion 21 via the intermediate gear 30 as shown in FIG. 3, and as the motor 2 rotates, Both gears 22 and 23 rotate in mutually opposite directions at different rotational speeds. And the above one-way clutch
Since the directions in which the gears 22 and 23 allow the idle rotation of the shafts 13 and 13 are the same, the shaft 24 rotates only through one of the gears 22 and 23 according to the rotation direction of the motor 2. Driven. A cam plate 25 is fixed to the tip of the shaft 24, and a crank pin 26 having a roller 27 is fixed to the cam plate 25. The roller 27 is engaged with the long hole 70 in the follower 7 provided at the rear end of the plunger 4 in the direction orthogonal to the longitudinal direction of the plunger 4. The pair of bearings 12 and 12 for supporting the saw blade 5 are also provided.
Is provided on a bearing base 6 which is swingable by a shaft 18 in the gear box 10, and a roller 62 which is in contact with a cam surface on the upper surface of the cam plate 25 is attached to the bearing base 6. The roller 62 is moved by the spring 19 to the cam plate 25.
Is spring-biased in the direction of contact with. Now, if the motor 2 is rotated, the shaft 24 rotates through one of the gears 22 and 23 as described above. At this time, the roller 27 mounted on the crank pin 26 and the follower 7 By the engagement, the plunger 4 slidably held by the bearings 12 and 12 and the saw blade 5 attached thereto reciprocate in the axial direction, and at the same time, the cam plate 25 and the roller 62 The saw blade 5 is driven so that the tip of the blade 5 draws an ellipse because the bearing base 6 swings about the shaft 18 by the engagement. The cam plate 25 is a crank pin as shown in FIG.
By providing the thinned portion 26a on the 26 side, dynamic balance during rotation is ensured. Further, as shown in FIG. 4, the follower 7 is attached to the plunger 4 by forming the plunger 4 as a cylindrical pipe.
Axial slits 45, 45 are formed at the rear end of the rear end, and a protrusion 71 is provided so as to project from the tip of the plate-like follower 7 having a triangular planar shape. The protrusion 71 is inserted into the plunger 4. Insert the follower 7 in the slit 45,
This is done by inserting a spring pin 72 through the plunger 4 and the follower 7. In the figure, 8 is a main switch, 81 is a battery pack fixing metal fitting, 82 is a spring for attaching / detaching the battery pack 9, and 66 is an adjustment for adjusting the swing range of the bearing base 6 by contacting the bearing base 6. It is a lever. As shown in FIG. 2, this is a detent for the plunger 4, and as shown in FIG. Guides located 62,62
Is provided, and both ends of the detent pin 17 are positioned on the guide portions 62, 62 parallel to the plunger 4 via the reinforcing plates 63, 63. At this time, the reinforcing plates 63, 63 that cover the guide portions 62, 62 are formed as an integrated body, not as separate members, so that both reinforcing plates 6
The portion connecting the 3,63 is located directly under the plunger 4 and between the pair of bearings 12,12, and the groove 64 is provided on the upper surface side, that is, the plunger 4 side. 64 is used as grease reservoir. In the figure, 65 is a reinforcing plate 63,6
3 is a hook portion that attaches 3 to the bearing base 6. Since the reinforcing plate 63 made of a thin steel plate covers each guide portion 62, the guide portion 62 is not worn by the contact with the rotation stop pin 17, and the guide portions 62, 62 are covered. Since there is a grease reservoir at the portion connecting the reinforcing plates 63, 63, the grease does not scatter from the bearing 12 and seizure does not occur on the plunger 4. Since the detent pin 17 formed of a spring pin and press-fitted and fixed to the plunger 4 is used as the detent member, the detent member can be easily attached to the plunger 4.

[Effect of device]

As described above, in the present invention, the wear of the guide portion due to the sliding contact between the anti-rotation member and the guide portion is prevented by the reinforcing plate, and therefore, the plunger is rotated about the axis. Between the bearings that support both ends of the plunger, and the bearing plates are not damaged by wear debris, and the reinforcing plates are arranged on a pair of guides on both sides of the plunger. Since the part that is integrally connected in the above functions as a grease reservoir, the seizure of the plunger due to running out of grease is less likely to occur, and the life is not reduced. It is highly reliable in terms of free support.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention, and FIG. 2 (a).
(B) and (c) are partially broken side view, sectional view taken along line XX and exploded perspective view of the same, FIG. 3 is an explanatory view of a meshing portion, FIG. 4 is a broken plan view of a motion converting portion, and FIG. Is a bottom view of the cam plate, FIGS. 6 (a) and 6 (b) are a partially cutaway side view and a sectional view taken along the line Y-Y of the conventional example, in which 4 is a plunger, 5 is a saw blade, 6 is a bearing stand, 12 is a bearing, 17 is a detent pin, 62 is a guide portion, and 63 is a reinforcing plate.

Claims (1)

(57) [Scope of utility model registration request] 1. A reciprocating plunger to which a saw blade is mounted, and a drive device for reciprocatingly driving the plunger, and guide members arranged parallel to the plunger on both sides of the plunger. In the reciprocating saw, in which the plunger is provided with a detent member that positions both ends on both guide members to deter the rotation of the plunger about its axis, a wear resistant reinforcing plate is provided on each guide member. The anti-rotation member is arranged on the reinforcing plate, and the reinforcing plates are integrally connected between the bearings provided on the bearing stand and supporting both ends of the plunger to form a grease reservoir. A reciprocating saw that is characterized by