JP2015157379A - reciprocating tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocating tool including a clamp device in which a blade does not fall off even when an external force in an axial direction is applied on an operation sleeve.SOLUTION: A reciprocating tool includes: a slit 34 in an axial direction formed at a tip part of a reciprocation axis; an engaging pin 23 installed in the slit 34 to be able to advance and retract; a male screw 32a formed in the reciprocation axis; and an operation sleeve 40 in which a female screw 44 screwed to the male screw 32a and a taper-shaped pressing surface 42 which can come into contact with the engaging pin 23 are formed on an inner periphery. By the movement of the operation sleeve 40 in the axial direction by a rotation operation, the engaging pin 23 is pressed to the taper-shaped pressing surface 42, it enters the slit 34 and it is engaged with an engaging hole 16 of a blade 15 inserted in the slit 34, and also, the blade 15 is clamped to the reciprocation axis by pressing the blade 15 to the slit 34 wall.

Description

  The present invention relates to a reciprocating tool, and more particularly, to a clamping device for attaching a blade to a reciprocating shaft.

  In general, a reciprocating tool such as a reciprocating saw used for cutting wood or the like is known. This type of reciprocating tool includes a clamp device for attaching a blade to the tip of a reciprocating shaft that reciprocates by a drive source such as a motor.

  In a cutting operation using a reciprocating tool, it is necessary to replace the blade when the blade is worn or when the type of the material to be cut is changed. For example, in Patent Document 1 below, as a clamping device with improved blade replacement workability, a locking pin that is movably installed on a reciprocating shaft (plunger) is formed on the inner periphery of the operation sleeve (first blade holder). By pressing and moving with the tapered surface, the locking pin is locked in the locking hole of the blade inserted in the slit of the reciprocating shaft (plunger), and the blade is slitted by the pressing of the locking pin. An invention relating to a clamping device that clamps a blade on a reciprocating shaft (plunger) by being pressed against the shaft is described.

  In Patent Document 1, the operation sleeve (first blade holder) engages with a spiral groove formed on a reciprocating shaft (plunger) and is urged by a compression coil spring. By moving the operating sleeve in the axial direction while rotating, the urging force of the compression coil spring efficiently acts on the locking pin through the spiral groove and the tapered surface, so that the blade can be applied to the slit wall with sufficient force. Can be pressed.

Japanese Patent No. 3858529

  However, in the case of the clamping device described above, when an axial external force acts on the operation sleeve (first blade holder), the operation sleeve (first blade holder) moves along the spiral groove against the biasing force of the compression coil spring. There is a possibility of moving in the axial direction while rotating, releasing the pressing of the locking pin by the tapered surface, and dropping the blade from the reciprocating shaft.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a reciprocating tool including a clamp device in which the blade does not fall off even when an external force in the axial direction is applied to the operation sleeve. is there.

  The reciprocating tool according to the present invention is a reciprocating tool for performing a cutting operation by clamping a blade having a locking hole to a tip portion of a reciprocating shaft by a clamping device, and the clamping device includes the reciprocating motion. An axial slit formed at the tip of the shaft, a locking pin installed in the slit so as to be able to advance and retreat, a male screw formed on the reciprocating shaft, a female screw screwed with the male screw, and the An operating sleeve having an inner periphery formed with a tapered pressing surface capable of abutting on the locking pin, and the locking pin is moved in the axial direction by a rotation operation of the operating sleeve. The blade is pressed by the surface, enters the slit and is locked in the locking hole of the blade inserted into the slit, and the blade is pressed against the slit wall so that the blade is moved to the reciprocating shaft. Characterized in that it flops.

  In the reciprocating tool according to the present invention, the tapered pressing surface can be formed with a diameter increasing toward a tip direction of the reciprocating shaft.

  In the reciprocating tool according to the present invention, at least one end of the locking pin can be formed in a spherical shape.

  According to the present invention, it is possible to provide a reciprocating tool including a clamp device in which the blade does not fall off even when an external force in the axial direction is applied to the operation sleeve.

It is a side view of the reciprocating tool which concerns on embodiment of this invention. It is a top view of the reciprocating tool which concerns on embodiment of this invention. It is a figure which shows the principal part of the BB cross section in FIG. In the AA cross section of FIG. 1, it is a figure explaining the attachment procedure of a blade, (a) has shown the state which inserted the blade in the slit, (b) has shown the state which clamped the blade Yes. FIG. 2 is a diagram for explaining a blade removal procedure in the AA cross section of FIG. 1, (a) shows the unclamped state of the blade, and (b) is a process of pulling out the blade from the slit in the unclamped state. Is shown. It is sectional drawing explaining the clamp apparatus of the reciprocating tool which concerns on another embodiment of this invention.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment for carrying out the invention will be described with reference to the drawings by taking a reciprocating saw as a reciprocating tool as an example. The following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. Further, in this specification, “front, rear, left, right, upper, lower” is defined and described as shown in the drawing based on the cutting work posture.

  First, an outline of a reciprocating saw that is a reciprocating tool according to an embodiment of the present invention will be described with reference to FIGS.

  A reciprocating saw 1 that is a reciprocating tool according to an embodiment of the present invention includes a main body 10 and a battery pack 14 that is attached to a lower rear portion of the main body 10. A clamp device 20 for attaching the blade 15 is provided in front of the main body 10. The main body 10 includes a housing 11, a motor (not shown) housed behind the housing 11, and a drive conversion mechanism (not shown) that converts the rotation of the motor housed in front of the housing 11 into a reciprocating motion. The reciprocating shaft 21 that reciprocates in the front-rear direction by the drive conversion mechanism protrudes from the front of the housing 11. A clamp device 20 is provided at the tip of the reciprocating shaft 21.

  A central portion in the front-rear direction of the housing 11 is formed as a grip portion 12, and a switch 13 is disposed on the front lower surface of the grip portion 12. Then, by turning on the switch 13 with the hand holding the grip portion 12, the electric power of the battery pack 14 is supplied to the motor, and the blade 15 reciprocates so that a desired cutting operation can be performed.

  Next, in addition to the reference diagrams of FIGS. 3 to 5, the clamp device 20 of the reciprocating saw 1 that is a reciprocating tool according to the embodiment of the present invention will be described.

  The clamp device 20 of the reciprocating saw 1 that is a reciprocating tool according to an embodiment of the present invention includes a blade holder 30, a locking pin 23, and an operation sleeve 40. The blade holder 30 is formed with a small-diameter shaft portion 31, a large-diameter shaft portion 32, and a connecting shaft portion 33 from the front, and the small-diameter shaft portion 31 is formed with an axial slit 34. The small diameter shaft portion 31 is formed with a hole 35 penetrating in a direction orthogonal to the axial direction. The hole 35 includes a large diameter hole 35a formed through the slit 34 and a small diameter hole 35b communicating with the large diameter hole 35a. A large-diameter hole 35a on the side where the small-diameter hole 35b is located across the slit 34 is filled with a repulsion pin 36 made of an elastic material. A locking pin 23 having both end portions 23a and 23a formed in a spherical shape is movably inserted into a large-diameter hole 35a opposite to the side where the small-diameter hole 35b is located across the slit 34. Yes.

  A male screw 32 a is formed on the outer periphery of the large-diameter shaft portion 32 of the blade holder 30. Further, the connecting shaft portion 33 of the blade holder 30 is fixed to the reciprocating shaft 21 by two fixing pins 22. In the present embodiment, the reciprocating shaft 21 and the blade holder 30 are formed as separate members and fixed by the two fixing pins 22, but may be configured as an integral member. That is, the blade holder 30 in the present embodiment corresponds to the reciprocating shaft of the present invention.

  A seal plate fixing hole 41, a tapered pressing surface 42, a small diameter portion 43, a female screw 44, and a retaining ring groove 45 are formed on the inner circumference of the operation sleeve 40 from the front. The operation sleeve 40 is attached by screwing the female screw 44 into the male screw 32 a of the blade holder 30. In the present embodiment, the male screw 32a and the female screw 44 employ metric coarse screws. A retaining ring 51 is mounted in the retaining ring groove 45 of the operation sleeve 40 to prevent the operation sleeve 40 from falling off the blade holder 30. The small-diameter portion 43 is fitted to the small-diameter shaft portion 31 of the blade holder 30 and has a function of preventing the operation sleeve 40 from rattling with respect to the blade holder 30 and guiding the blade 15 inserted into the slit 34. ing. A seal plate 52 is mounted in the seal plate fixing hole 41 to prevent foreign matter from entering the inside of the operation sleeve 40. The tapered pressing surface 42 has a diameter that increases toward the front in the axial direction, and is formed at a position where one end 23 a of the locking pin 23 can be pressed. In the present embodiment, the tapered pressing surface 42 is formed as a shape that expands at a constant rate toward the front in the axial direction, that is, as a tapered surface.

  Next, a procedure for attaching the blade 15 with the clamping device 20 having the above-described configuration will be described with reference to FIG.

  First, the base end portion of the blade 15 is inserted into the slit 34 of the blade holder 30. At this time, as shown in FIG. 4A, the blade 15 is inserted to a position where it comes into contact with the back of the slit 34 so that the locking hole 16 of the blade 15 faces the locking pin 23. Is set. In this state, there is no problem even if the center line of the locking hole 16 and the center line of the locking pin 23 are slightly shifted.

  Next, the operation sleeve 40 is rotated in the clamping direction. By the relative rotation of the male screw 32a with respect to the female screw 44 by this rotation operation, the operation sleeve 40 moves forward. As the operation sleeve 40 moves forward, one end 23 a is pressed by the tapered pressing surface 42, so that the locking pin 23 enters the slit 34 and the other end 23 a is inserted into the slit 34. The blade 15 is clamped to the blade holder 30 by being locked in the locking hole 16 of the blade 15 and pressing the blade 15 against the wall of the slit 34 (see FIG. 4B). In this state, the tip of the other end 23 a of the locking pin 23 is pushed into the repulsion pin 36. Even when the center line of the locking hole 16 and the center line of the locking pin 23 are slightly shifted when the base end of the blade 15 is inserted into the slit 34 of the blade holder 30, the locking pin 23 is In the process of entering the 15 locking holes 16, the center line of the locking holes 16 coincides with the center line of the locking pins 23 by the action of the spherical shape of the other end 23 a. It is corrected as follows. Therefore, it can clamp reliably.

  Next, a procedure for removing the blade 15 will be described with reference to FIG.

  First, the operation sleeve 40 is rotated in the unclamping direction. Note that the unclamping direction is opposite to the above-described clamping direction. By the relative rotation of the male screw 32a with respect to the female screw 44 by this rotation operation, the operation sleeve 40 moves rearward. As shown in FIG. 5A, the taper-shaped pressing surface 42 is separated from the one end portion 23a by the backward movement of the operation sleeve 40, and the other end portion 23a is caused by the elastic restoring force of the repulsion pin 36. Is pushed and the locking pin 23 is retracted downward in the drawing. Next, in this state, when the blade 15 is pulled to the right side of the page, the edge of the locking hole 16 presses the other end 23a having a spherical shape, so that the component force of the pressing force generated by the action of the spherical shape is obtained. However, as shown in FIG. 5B, the locking pin 23 is further retracted downward in the drawing, and the blade 15 can be pulled out from the slit 34.

  Thus, in the clamping device 20 of the reciprocating saw 1 which is a reciprocating tool according to the embodiment of the present invention, the blade 15 can be attached by inserting the blade 15 into the slit 34 and rotating the operation sleeve 40. Good workability. Further, since the operation sleeve 40 is moved in the axial direction by screwing in and out of the female screw 44 and the male screw 32a, the self-locking function of the screw allows the operation sleeve 40 to move even when an axial external force is applied. There is nothing to do. Therefore, the blade 15 does not fall off unexpectedly. In particular, the blade 15 does not fall off even when an adjacent member or the like contacts the operating sleeve 40 that is reciprocating during the cutting operation.

  Further, in the clamping device 20 of the reciprocating saw 1 that is a reciprocating tool according to the embodiment of the present invention, the blade 15 can be removed by rotating the operation sleeve 40 and pulling out the blade 15 from the slit 34. Good workability. Further, the locking pin 23 is retracted by the elastic restoring force of the repulsion pin 36, and the end 23a of the locking pin 23 is formed in a spherical shape, so that the locking pin 23 can be moved even if the force for pulling the blade 15 is small. Further, the component force in the retreating direction is efficiently generated, so that the blade 15 can be easily removed.

  Furthermore, in the clamping device 20 of the reciprocating saw 1 which is a reciprocating tool according to the embodiment of the present invention, both end portions 23a and 23a of the locking pin 23 have the same spherical shape, so that an assembly error may occur. There is no.

  Furthermore, in the clamping device 20 of the reciprocating saw 1 which is a reciprocating tool according to the embodiment of the present invention, screws (male screw 32a and female screw 44) are employed as the moving mechanism in the axial direction of the operation sleeve 40. Compared to the case where a spiral groove is employed, the processing is easy, and it can be manufactured at a low cost.

  The preferred embodiments of the present invention have been described above, but the technical scope of the present invention is not limited to the technical scope of the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. It is possible.

  For example, in the above embodiment, the male screw 32a and the female screw 44 employ metric coarse screws, but metric fine screws may be employed. In short, any screw having a self-locking function may be used.

  Further, for example, in the above-described embodiment, the tapered pressing surface 42 of the operation sleeve 40 has a shape that expands at a constant rate toward the front in the axial direction, that is, a tapered surface, but the diameter increases at a non-constant rate. It is also possible to make it a shape. In the above-described embodiment, the tapered pressing surface 42 of the operation sleeve 40 has a shape that increases in diameter toward the front in the axial direction, but may have a shape that increases in diameter toward the rear in the axial direction. .

  For example, as shown in FIG. 6, as another embodiment of the present invention, a spring 61 is arranged between the blade holder 30 and the operation sleeve 40 to generate resistance when the operation sleeve 40 is rotated. Thus, it can be configured so as to obtain an appropriate operational feeling.

  Moreover, although the said embodiment demonstrated the case where this invention was implemented in the reciprocating saw which is a reciprocating tool driven by a battery pack, the reciprocating tool of this invention is limited to the reciprocating tool driven by a battery pack. Not. For example, a reciprocating tool driven by an external power source and a reciprocating tool driven by compressed air are also included.

DESCRIPTION OF SYMBOLS 1 Reciprocating tool 10 Main part 11 Housing 12 Holding part 13 Switch 14 Battery pack 20 Clamping device 21 Reciprocating shaft 22 Fixing pin 23 Locking pin 23a End 30 Blade holder 31 Small-diameter shaft part, 32 Large-diameter shaft part, 32a Male thread, 33 Connection shaft part, 34 Slit, 35 holes, 35a Large-diameter hole, 35b Small-diameter hole, 36 Rebound pin, 40 Operation sleeve, 41 Seal plate fixing hole, 42 Taper Pressure surface, 43 Small diameter part, 44 Female thread, 45 Retaining ring groove, 51 Retaining ring, 52 Seal plate, 61 Spring

Claims (3)

In a reciprocating tool for performing a cutting operation by clamping a blade in which a locking hole is formed to a tip portion of a reciprocating shaft by a clamp device,
The clamping device includes an axial slit formed at a tip of the reciprocating shaft;
A locking pin that is installed in the slit so as to be able to advance and retract,
A male screw formed on the reciprocating shaft;
An operation sleeve in which a female screw threadedly engaged with the male screw and a tapered pressing surface capable of coming into contact with the locking pin are formed on the inner periphery,
When the operation sleeve is rotated in the axial direction by the rotation operation, the locking pin is pressed by the tapered pressing surface, enters the slit, and locks in the locking hole of the blade inserted into the slit. A reciprocating tool, wherein the blade is clamped to the reciprocating shaft by pressing the blade against the slit wall.   The reciprocating tool according to claim 1, wherein the tapered pressing surface is formed with a diameter increasing toward a tip direction of the reciprocating shaft. The reciprocating tool according to claim 1, wherein at least one end of the locking pin is formed in a spherical shape.

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