JP4637870B2 - Blade mounting device for reciprocating cutting tool - Google Patents

Description

  The present invention relates to an apparatus for attaching a blade (saw blade) to a reciprocating cutting tool such as a reciprocating saw.

This type of reciprocating cutting tool includes a rod that reciprocates in the axial direction by a drive motor, and a blade attachment device for attaching a blade is provided at the tip of the rod. A blade is attached to the tip of the rod via the blade attachment device.
Conventional blade mounting devices generally have a configuration disclosed in, for example, US Pat. No. 5,557,071. The conventional blade mounting device 30 includes a rod 31 reciprocally moved in the axial direction by a drive motor as shown in FIG. 13 using FIG. 1 of the publication, and an operation in which the rod 31 is rotatably mounted on the outer peripheral side of the tip. A sleeve 32 and a torsion spring 34 that urges the operation sleeve 32 to rotate in the clamping direction are provided. A slit 31a into which the base end of the blade 35 is inserted is formed at the tip of the rod 31, and a steel ball holding hole 31b is formed at the tip side of the rod 31 in a state of passing through the slit 31a. A steel ball 33 is held in the steel ball holding hole 31b.
A cam surface for changing the inner diameter is formed on the inner peripheral surface of the operation sleeve 32, and a steel ball 33 is held between the cam surface and the steel ball holding hole 31b. A guide groove 32a is formed in the operation sleeve 32, and a guide pin 36 attached to the tip of the rod 31 is inserted into the guide groove 32a. The operation sleeve 32 can be rotated within a range in which the guide pin 36 is relatively movable in the guide groove 32a.

When the operation sleeve 32 is rotated to the unclamping side against the torsion spring 34, the steel ball 33 is relatively moved to the large diameter side of the cam surface, so that the steel ball 33 is retracted from the slit 31a. Thus, the base end of the blade 35 can be inserted into the slit 31a. When the rotation operation of the operation sleeve 32 toward the unclamping side is released with the base end portion of the blade 35 inserted into the slit 31a, the operation sleeve 32 is returned to the clamping side by the torsion spring 34.
When the operation sleeve 32 is returned to the clamp side, the steel ball 33 is relatively moved to the smaller diameter side of the cam surface, so that the steel ball 33 is pushed into the holding hole 31b and protrudes into the slit 31a. The steel ball 33 protruding into the slit 31a fits into the clamp hole 35a of the blade 35, so that the blade 35 is attached to the tip of the rod 31 so as not to come off.
US Pat. No. 5,557,071

According to the conventional blade mounting device 30 configured as described above, the blade 35 can be inserted into and removed from the slit 31a by rotating the operation sleeve 32 to the unclamping side against the torsion spring 34. When the blade 35 is attached or detached, it is necessary to rotate the operation sleeve 32 without fail, and the operation is troublesome in this respect.
An object of this invention is to provide the braid | blade mounting apparatus which operation is easier than before.

Therefore, the present invention is a blade mounting device having the configuration described below .
The first invention is an apparatus for inserting a base end portion of a blade into a slit provided at a tip of a rod that reciprocates in an axial direction and attaching the blade to the rod. An operation sleeve provided rotatably, a torsion spring that urges the operation sleeve to rotate in the clamping direction, and a blade that is inserted into the slit to restrict the rotation of the operation sleeve in the clamping direction against the torsion spring. When the operation sleeve is rotated in the clamping direction, the operation member is inserted into a clamp hole provided in the proximal end portion of the blade. A blade attachment device provided with a clamp member that clamps the blade so that it cannot be pulled out of the slit.
According to the blade attachment device according to the first aspect of the present invention, when the attachment side base end portion of the blade is inserted into the slit, the regulating member is pushed by the base end portion. When the restricting member is pushed by the blade, the operation sleeve is allowed to rotate in the clamping direction. Therefore, the operation sleeve is rotated in the clamping direction by the torsion spring. Is attached so that it cannot come out of the slit.
In this way, just by inserting the base end of the blade into the slit, the operating sleeve automatically rotates in the clamping direction, and the blade is attached to the tip of the rod. The blade can be easily installed without doing so.
According to a second aspect of the present invention, in the first aspect of the present invention, “a cam surface whose inner diameter is changed is provided on the inner peripheral surface of the operation sleeve, and the clamp member is moved to the clamp member by the movement of the cam surface with respect to the clamp member as the operation sleeve rotates. Is a blade mounting device configured to be engaged and disengaged with respect to the clamp hole.
According to the blade mounting device according to the second aspect of the present invention , reliable clamping and unclamping can be performed with a simple configuration.

A third invention is the “blade mounting device in which dust is prevented from adhering to the clamp” in the first invention .
According to the blade mounting device according to the third aspect of the present invention, dust or the like is less likely to adhere to the clamp member due to the dust or the like prevention treatment applied to the clamp member. For this reason, even if dust such as chips generated by the cutting operation enters the blade mounting device, the clamp member can be smoothly removed from the clamp hole of the blade, and the blade can be removed reliably. In addition, since it is difficult for dust or the like to adhere to the clamp member, movement resistance due to dust or the like is reduced during movement, so that smooth movement can be ensured. Operability can be ensured.
In the present specification, the “dust prevention treatment” refers to a process for finishing the surface roughness of the clamp member to a finer roughness than dust. Various treatments can be used for the dust adhesion prevention treatment. For example, surface hardening treatment such as gas soft nitriding and carburizing, plating treatment such as electroless nickel plating, hot dipping and vapor deposition plating, polishing treatment such as polishing, electrolytic polishing and chemical polishing can be used. By making the surface of the clamp member into a so-called slippery state by the above process, adhesion to dust or the like (property to adhere) can be reduced.

According to a fourth aspect of the present invention, in the first aspect, the auxiliary sleeve for attaching the shoulder portion of the blade to the tip of the rod is attached, and an auxiliary pin is driven between the auxiliary sleeve and the rod. Is attached to the rod so that it cannot rotate and cannot move in the axial direction.
According to the blade attachment device of the fourth invention, the auxiliary sleeve for receiving cutting resistance and the like loaded on the blade is fixed to the tip of the rod by the auxiliary pin instead of the clamp member, so that the cutting transmitted through the auxiliary sleeve An external force such as resistance is not applied to the clamp member, whereby the clamp member can be prevented from being twisted and a smooth movement can be ensured, and as a result, the smooth operability of the blade mounting device can be ensured.
A fifth invention is the “blade mounting device in which the clamp member is urged in a direction to be removed from the clamp hole of the blade” in the first invention .
According to the blade attachment device according to the fifth aspect of the present invention , the clamp member can be reliably detached from the blade, so that the operability of the blade attachment device can be further enhanced.
According to a sixth aspect of the invention, there is provided a blade attachment device for attaching the blade to the rod by inserting the base end of the blade provided with the clamp hole into a slit formed at the tip of the reciprocating rod. A clamp member which is movably supported by the provided support hole and is provided so as to be able to advance and retreat toward the clamp hole of the blade, and which is inserted into the clamp hole and clamps the blade so as not to come out of the slit; It is a blade mounting device in which a member is subjected to a treatment to prevent adhesion of dust and the like.
According to the blade attachment device according to the sixth aspect of the invention, smooth detachment of the clamp member from the clamp hole and smooth movement of the clamp member in the support hole can be ensured.

Next, an embodiment of the present invention will be described with reference to FIGS. In the first embodiment, a reciprocating saw is illustrated as an example of a reciprocating cutting tool. 1 and 2 show the tip side of the reciprocating saw 1. FIG. The reciprocating saw 1 includes a rod 2 that reciprocates in the axial direction using an electric motor (not shown) as a drive source. The first embodiment is characterized by a blade attachment device 10 for attaching the blade 3 to the tip of the rod 2, and the basic configuration of the reciprocating saw 1 does not need to be changed as compared with the conventional configuration. Therefore, explanation is omitted.
The blade mounting device 10 according to the first embodiment includes an operation sleeve 11 that is rotatably provided at the tip of the rod 2, a torsion spring 12 that urges the operation sleeve 11 to rotate in the clamping direction, and a resistance against the torsion spring 12. Then, the rotation of the operation sleeve 11 in the clamping direction is restricted, and when the blade 3 inserted into the slit 2a formed at the tip of the rod 2 is pressed, the operation sleeve 11 is allowed to rotate in the clamping direction. When the control member 20 that moves and the operation sleeve 11 rotate in the clamping direction, a clamp member 18 that fits into the clamp hole 3a of the blade 3 and clamps the blade 3 so as not to be detached from the slit 2a is provided.

A slit 2 a is formed in the tip end surface of the rod 2. The slit 2 a is formed along the axis of the rod 2 with a width that allows the base end 3 b of the blade 3 to be inserted. A housing recess 2c having a larger cross-sectional area than the slit 2a is formed in the back of the slit 2a, and the regulating member 20 is housed in the housing recess 2c so as to be movable along the axial direction of the rod 2. Has been.
The restricting member 20 is urged in a direction to move to the mouth side (the front end surface side of the rod 2) of the slit 2a by a compression spring 21 attached between the bottom surface (butting surface) of the housing recess 2c. One restriction pin 22 is driven into the restriction member 20 in the thickness direction. Both end portions of the restriction pin 22 protrude from the both side surfaces of the restriction member 20 to the side. On the other hand, guide grooves 2b and 2b that are long along the axial direction of the rod 2 are formed in the side portion of the housing recess 2c so as to penetrate the rod 2 in the radial direction, and both guide grooves 2b and 2b are formed. Thus, both end portions of the restriction pin 22 protrude in the radial direction from the peripheral surface of the rod 2.
The restricting member 20 is movable in the axial direction of the rod 2 within a range in which both end portions of the restricting pin 22 can move in the guide grooves 2 b and 2 b. The restricting member 20 is pushed by the base end 3b of the blade 3 inserted into the slit 2a and moves to the inner part of the accommodating recess 2c, whereby the restricting pin 22 is retracted.

The operation sleeve 11 is attached to the outer peripheral side of the tip of the rod 2. The operation sleeve 11 is supported so as to be rotatable about the axis of the rod 2. Retaining rings 13 and 14 attached to the rod 2 are located on the front end surface side and the rear end surface side of the operation sleeve 11. Therefore, the operation sleeve 11 is supported so as not to move in the axial direction with respect to the rod 2.
The torsion spring 12 is mounted between the rear end surface of the operation sleeve 11 and the flange 15 fixed to the rod 2. The torsion spring 12 biases the operation sleeve 11 in the clamping direction (counterclockwise direction as viewed from the distal end surface side of the rod 2 (in FIG. 5)).

  In addition, L-shaped guide grooves 16 and 16 are formed in two directions on the circumferential surface of the operation sleeve 11 facing each other in the radial direction so as to be point-symmetric with each other. Both ends of the restriction pin 22 are inserted into the guide grooves 16 and 16. Each of the guide grooves 16 and 16 has an L shape including a horizontal groove 16b along the axial direction and a vertical groove 16a along the circumferential direction. The rotation of the operation sleeve 11 is restricted when both ends of the restriction pin 22 are located in the lateral grooves 16b of the guide grooves 16, 16, and the operation sleeve 11 is rotatable when located in the vertical groove 16a. It becomes a state. The operation sleeve 11 rotates in a range between a clamp position and an unclamp position. Details of this will be described later.

Next, as shown in FIG. 5, a cam surface 17 whose inner diameter changes when rotated is formed on the inner peripheral surface of the operation sleeve 11. On the other hand, a clamp member 18 is attached to the side portion of the rod 2. The clamp member 18 is inserted into a support hole 2e formed in the side portion of the rod 2 along the radial direction, and is supported so as to be movable in the radial direction of the rod 2. When the clamp member 18 advances toward the center of the rod 2, the tip protrudes into the slit 2 a as shown by a two-dot chain line in FIG. 5, and when the clamp member 18 moves backward, the tip becomes a slit 2 a as shown by a solid line in FIG. 5. Exit from inside. The cam surface 17 is located behind the clamp member 18. For this reason, when the operation sleeve 11 is rotated to the clamp position, the cam surface 17 located behind the clamp member 18 changes to the small diameter side, whereby the clamp member 18 is pushed in the forward direction, and the tip thereof is slit 2a. Protruded inside. The tip of the clamp member 18 protruding into the slit 2a is fitted into the clamp hole 3a of the blade 3, whereby the blade 3 is clamped so as not to be detached from the slit 2a.
On the other hand, when the operation sleeve 11 is rotated to the unclamping position, the cam surface 17 located behind the clamp member 18 changes to the larger diameter side, so that the clamp member 18 is allowed to retract. When the clamp member 18 is in a retractable state, the blade 3 can be extracted from the slit 2a, and conversely, the base end portion 3b of the blade 3 can be inserted into the slit 2a.

  According to the blade mounting device 10 of the first embodiment configured as described above, the regulating member 20 is compressed when the blade 3 is not attached to the rod 2 of the reciprocating saw 1 as shown in FIGS. 1 and 2. The spring 21 is located at the front end of the housing recess 2c. In a state where the restricting member 20 is located at the front end of the housing recess 2c, both end portions of the restricting pin 22 are located at the front ends of the lateral grooves 16b and 16b. In this state, since the operation sleeve 11 is locked so as not to rotate at the unclamping position, the clamp member 18 is retractable as shown in FIG. Therefore, the base end portion 3b of the blade 3 can be inserted into the slit 2a.

In order to attach the blade 3 to the tip of the rod 2 from such a non-use state of the blade attachment device 10, when the base end portion 3 b of the blade 3 is inserted into the slit 2 a and pushed in as it is, the regulating member 20 is applied to the compression spring 21. It opposes and retreats to the back side of the accommodation recess 2c. When the restricting member 20 is retracted, the restricting pin 22 retracts in the lateral groove 16b and enters the longitudinal groove 16a. When the restricting pin 22 enters the vertical groove 16a, the operation sleeve 11 becomes rotatable toward the clamp position. Since the operation sleeve 11 is urged toward the clamp position by the torsion spring 12, the operation sleeve 11 rotates toward the clamp position at this time.
When the operation sleeve 11 is rotated toward the clamp position, the cam surface 17 is displaced to the small diameter side with respect to the clamp member 18, so that the clamp member 18 is gradually projected into the slit 2a. Further, when the operation sleeve 11 rotates to the clamp position side, the restriction pin 22 moves relatively to the distal end side of the vertical groove 16a.

  When the operation sleeve 11 reaches the clamp position, the clamp member 18 protrudes into the slit 2a, and the protruded portion is fitted into the clamp hole 3a of the blade 3. When the clamp member 18 is fitted into the clamp hole 3a, the base end portion 3b of the blade 3 is clamped so as not to be detached from the slit 2a, and thus the blade 3 is attached to the rod 2 so as not to be detached. Further, since the base end portion 3b of the blade 3 is clamped so as not to be removed from the slit 2a, the regulating member 20 is held in a retracted state against the compression spring 21, so that the operation sleeve 11 is clamped by the torsion spring 12. Retained.

In order to remove the blade 3 attached as described above, the operation sleeve 11 is rotated toward the unclamping position against the torsion spring 12. As a result, the restricting pin 22 enters the lateral groove 16b, and therefore the restricting member 20 is advanced by the compression spring 21 in the housing recess 2c. Further, when the operation sleeve 11 is rotated toward the unclamping position, the cam surface 17 behind the clamp member 18 is displaced to the larger diameter side, so that the clamp member 18 can be pulled out of the clamp hole 3a of the blade 3 and retracted. It becomes a state.
Since the regulating member 20 is advanced by the compression spring 21 and this forward movement is permitted by the backward movement of the clamp member 18, the base end portion 3b of the blade 3 is pulled out so as to jump out of the slit 2a. Is disengaged from the tip of the rod 2.

As described above, according to the blade mounting device 10 of the first embodiment, if the base end portion 3b of the blade 3 is inserted into the slit 2a and pushed in as it is, the regulating member 20 is retracted against the compression spring 21. The operating sleeve 11 automatically rotates to the clamp position side, and the clamp member 18 is fitted into the clamp hole 3a, so that the blade 3 is attached so as not to be removed from the slit 2a.
Therefore, the blade 3 can be attached to the rod 2 by simply inserting the base end portion 3b of the blade 3 into the slit 2a without rotating the operation sleeve 11 as in the prior art. Ten usability (operability) can be greatly improved.
Further, when the blade 3 is removed from the rod 2, if the operation sleeve 11 is rotated to the unclamp side against the torsion spring 12, the blade 3 is pulled out from the base end portion 3b of the blade 3, The blade 3 can be easily removed from the rod.

The first embodiment described above can be implemented with various modifications. For example, the clamp member 18 may be replaced with a steel ball.
Moreover, although the reciprocating saw 1 was illustrated as an example of a reciprocating cutting tool, the illustrated blade mounting apparatus 10 can also be applied to other reciprocating cutting tools such as a jigsaw.

Next, the blade mounting apparatus 50 of 2nd Embodiment is demonstrated based on FIGS. In the blade mounting device 50 according to the second embodiment, the movement of the clamp member is mainly improved.
In the blade mounting apparatus 10 of the first embodiment, the clamp member 18 is processed into a predetermined shape using, for example, a SUJ material (high carbon chrome bearing steel), and supports the rod 2 without any special surface treatment. It is mounted in the hole 2e. For this reason, especially in the operation | work in places with much dust etc., dust tends to adhere to the front-end | tip part of the clamp member 18, and dust penetrate | invades and accumulates in the slight clearance gap between the clamp member 18 and the support hole 2e. There is a fear. If dust or the like adheres to the clamp member 18, the blade 3 may not be smoothly detached from the clamp hole 3a, and the movement in the unclamping direction may be deteriorated.

  In this regard, the clamp member 51 in the blade attachment measure 50 of the second embodiment has a feature that dust is difficult to adhere. As shown in FIGS. 8 and 10, the blade attachment device 50 of the second embodiment is also attached to the tip of a reciprocating saw rod 52. The blade mounting device 50 according to the second embodiment includes an operation sleeve 53 that is rotatably attached to the tip of a rod 52, a torsion spring 54 that urges the operation sleeve 53 to rotate in the clamping direction, and a resistance against the torsion spring 54. Then, the rotation of the operation sleeve 53 in the clamping direction is restricted, and when the blade 3 inserted into the slit 52a formed at the tip of the rod 52 is pushed, the operation sleeve 53 moves to a position that allows the rotation in the clamping direction. When the regulating member 56 and the operation sleeve 53 are rotated in the clamping direction, a clamping member 51 is provided that fits into the clamping hole 3a of the blade 3 and clamps the blade 3 so as not to be detached from the slit 52a.

  A regulating member 56 having a plate shape is accommodated in the inner part of the slit 52a so as to be movable in the axial direction of the rod 52 (the direction in which the blade 3 is inserted and removed). A compression spring 57 is interposed between the regulating member 56 and the bottom of the slit 52a. For this reason, the restricting member 56 is urged in the direction of moving toward the distal end side of the rod 52. A restriction pin 55 is fixed to the restriction member 56 in an orthogonal state along the thickness direction. The restricting pin 55 extends laterally from both the front and back surfaces of the restricting member 56 and protrudes to the side of the rod 52 through guide grooves 52 b and 52 b formed on both sides of the rod 52. Both guide grooves 52 b and 52 b are formed long in the axial direction of the rod 52. The restricting member 56 can move in the axial direction of the rod 52 within a range in which the restricting pin 55 can move within the both guide grooves 52b and 52b. Both end portions of the regulation pin 55 protruding to the side of the rod 52 are respectively inserted into guide grooves 53 a provided on the inner peripheral surface of the operation sleeve 53.

The operation sleeve 53 is attached to the tip of the rod 52 so as to be rotatable and not movable in the axial direction. A torsion spring 54 is interposed between the rear end portion of the operation sleeve 53 and the rod 52. The torsion spring 54 urges the operation sleeve 53 in the clamping direction (clockwise direction in FIGS. 9 and 11). The guide grooves 53a, 53a are formed on the rear inner peripheral surface of the operation sleeve 53 in a point-symmetrical positional relationship. Both the guide grooves 53 a and 53 a have an L shape in which a lateral groove 53 aa along the axial direction of the rod 52 and a longitudinal groove 53 ab along the circumferential direction of the rod 52 are continuous. As shown in FIG. 8, the rotation of the operation sleeve 53 is restricted when both ends of the restriction pin 55 are located in the lateral groove 53aa, and the rotation of the operation sleeve 53 is restricted when the rotation is located in the vertical groove 53ab. Is allowed.
The guide grooves 53a, 53a in the second embodiment are formed with a certain depth from the inner peripheral surface side, and do not penetrate as in the first embodiment. For this reason, both guide grooves 53a and 53a are not visible to the user.

Next, as shown in FIGS. 9 and 11, on the front inner peripheral surface of the operation sleeve 53, a cam surface 53b whose inner diameter changes when rotated is formed as in the first embodiment. The head of the clamp member 51 is in sliding contact with the cam surface 53b. A flange portion 51a is formed on the head of the clamp member 51, and the outer surface (lower surface in the drawing) of the flange portion 51a is formed in a spherical shape and is slidably contacted with the cam surface 53b in a spotted state. Yes. The clamp member 51 is supported by a support hole 52c formed in the rod 52 so as to be movable in the axial direction. The support hole 52c is formed so as to penetrate the slit 52a, and the distal end portion (upper end portion in the drawing) of the clamp member 51 reaches the slit 52a.
A compression spring 58 is interposed between the flange portion 51 a of the clamp member 51 and the rod 52. For this reason, the clamp member 51 is urged in a direction (downward in FIGS. 8 to 11) in which the tip end is extracted from the slit 52a. The distal end portion of the clamp member 51 is formed in a tapered shape as shown in the figure, and the tapered portion 51 b is inserted while being guided into the clamp hole 3 a of the blade 3 as shown in FIGS. 10 and 11.
The surface of the clamp member 51 is subjected to electroless nickel plating. By this electroless nickel plating process, the surface roughness of the surface of the clamp member 51 is finer than dust and the like, and the surface of the clamp member 51 is in a state in which dust or the like is difficult to adhere. In the second embodiment, the electroless nickel plating process corresponds to an example of a dust adhesion prevention process described in the claims.
A knob portion 53 c is provided on the outer surface of the operation sleeve 53 so as to protrude sideways in order to ensure operability when the operation sleeve 53 is rotated.

Next, an auxiliary sleeve 59 is attached between the distal end side of the rod 52 and the operation sleeve 53. An auxiliary pin 60 is driven between the auxiliary sleeve 59 and the rod 52. For this reason, the auxiliary sleeve 59 is fixed so that it cannot rotate with respect to the rod 52 and cannot move in the axial direction. The clamp member 51 is inserted into the support hole 52c through the relief hole 59a of the auxiliary sleeve 59. The escape hole 59a is formed with a sufficiently larger inner diameter than the clamp member 51, and the compression spring 58 is also located in the escape hole 59a.
As shown in FIG. 12, the shoulder 3c (see FIG. 6) of the blade 3 is brought into contact with the front end surface (the left end surface in FIGS. 8 and 10) of the auxiliary sleeve 59 to prevent the blade 3 in the mounted state from rattling. can do. Conventionally, the auxiliary sleeve having this function is fixed to the rod so as not to be rotatable and axially movable by the clamp member. However, the auxiliary sleeve 59 of the present embodiment is different from the clamp member 51 in the auxiliary pin 60. It is being fixed to the rod 52 via. Further, since the clamp member 51 is located in the escape hole 59a, the clamp member 51 is not in direct contact with the auxiliary sleeve 59. Therefore, the vibration of the blade 3 or the cutting resistance (vibration) applied to the blade 3 during the cutting operation or the like is not transmitted to the clamp member 51 through the auxiliary sleeve 59.

According to the blade attachment device 50 of the second embodiment configured as described above, the blade 3 can be attached and detached by the same operation as the blade attachment device 10 of the first embodiment. In the state shown in FIG. 8, both end portions of the restriction pin 55 are located at the front end of the lateral groove 53aa of the restriction groove 53. Since the regulating member 56 to which the regulating pin 55 is attached is urged toward the rod tip side by the compression spring 57, both ends of the regulating pin 55 are pressed against the front end of the lateral groove 53aa by the indirect action of the compression spring 57. Yes. Since both ends of the regulation pin 55 are located in the lateral groove 53aa, the operation sleeve 53 is locked at the unclamping position and does not rotate toward the clamping side.
In the state where the operation sleeve 53 is located at the unclamping position, as shown in FIG. 9, the deepest portion of the cam surface 53b is located behind the clamp member 51 (downward in the drawing). For this reason, the clamp member 51 is in a state in which it is retracted in the direction of being extracted from the slit 52a by the compression spring 58, whereby the tip of the clamp member 51 is in a state in which it does not protrude most into the slit 52a. Yes. In this state, the blade 3 can be inserted into the slit 52a, or the blade 3 can be extracted from the slit 52a.

  Conversely, in order to mount the blade 3, the base end 3b of the blade 3 may be inserted into the slit 52a in the unclamped state. When the base end 3b of the blade 3 is inserted into the slit 52a, the regulating member 56 is pushed into the back of the slit 52a against the compression spring 57. When the regulating member 56 is pushed into the inner part of the slit 52a, both end portions of the regulating pin 55 move backward in the guide groove 52b and the lateral groove 53aa of the guide groove 53a. Since the lateral groove 53aa and the longitudinal groove 53ab of the guide groove 53a communicate with each other in an L shape, when the both ends of the regulation pin 55 reach the rear end of the lateral groove 53aa, the operation sleeve 53 is allowed to rotate toward the clamp side. Accordingly, the operation sleeve 53 is rotated to the clamp side by the torsion spring 54. When the operation sleeve 53 rotates to the clamp side, both end portions of the regulation pin 55 relatively move in the longitudinal groove 53ab toward the tip side.

  Further, when the operation sleeve 53 rotates to the clamp side, the depth of the cam surface 53b at the rear of the clamp member 51 gradually decreases, so that the clamp member 51 protrudes into the slit 52a against the compression spring 58. Moving. The tapered portion 51 b of the clamp member 51 protruding into the slit 52 a is inserted into the clamp hole 3 a of the blade 3. When the taper portion 51b abuts against the mouth of the clamp hole 3a and the movement of the clamp member 51 in the direction protruding into the slit 52a is restricted, the rotation of the operation sleeve 53 toward the clamp side is restricted and locked at the clamp position. The At this time, the blade 3 is locked in a state in which the tapered portion 51a of the clamp member 51 is inserted into the clamp hole 3a and cannot be removed from the slit 52a. It will be in the state of wearing. This mounted state is shown in FIGS. 10 and 11.

  To remove the blade 3, the operation sleeve 53 may be rotated to the unclamping side against the torsion spring 54. When the operation sleeve 53 is rotated to the unclamping side and both ends of the regulation pin 55 are moved relatively to the base end side of the longitudinal groove 53ab, the both ends of the regulation pin 55 pass through the lateral groove 53aa. It can move to the side. On the other hand, when the operation sleeve 53 is rotated to the unclamping side, the cam groove 53b at the rear of the clamp member 51 is deepened, so that the clamp member 51 moves in the direction of being extracted from the slit 52a by the compression spring 58. Thereby, the tapered portion 51 b of the clamp member 51 is extracted from the clamp hole 3 a of the blade 3. In this way, both end portions of the regulation pin 55 can move in the lateral groove 53aa to the tip end side, and the clamp member 51 is detached from the clamp hole 3a, whereby the regulation member 56 is moved to the rod tip side by the compression spring 57. The blade 3 is pushed out from the slit 52a.

When cutting operation or the like is performed using the reciprocating saw with the blade 3 attached to the tip of the rod 52 by the blade mounting device 50 configured as described above, fine dust such as chips (1 micron or less) generated as a result ) Mainly enters the slit 52 a of the blade mounting device 50, and is scattered around the clamp member 51. However, the electroless nickel plating process is applied to the clamp member 51 of the blade mounting device 50 in the second embodiment, so that dust and the like are less likely to adhere (low adhesion). For this reason, when the operation sleeve 53 is rotated to the unclamping side, the clamp member 51 always moves smoothly to the unclamping side, whereby the taper portion 51b is reliably detached from the clamp hole 3a of the blade 3 and the slit The blade 3 can be reliably extracted from 52a. Since the blade 3 is surely pushed out from the slit 52a, it is not necessary for the user to hold the hot blade after the cutting operation and pull it out.
In addition, since the adhesion of the clamp member 51 to dust or the like is low, even if dust or the like enters the gap between the support hole 52c and the clamp member 51, the clamp member 51 does not receive sliding resistance and the operation sleeve 53 rotates. Accordingly, the blade mounting device 50 can be operated with good operability.

Further, the auxiliary sleeve 59 for suppressing the rattling by contacting the shoulder 3c of the blade 3 and receiving external force such as cutting resistance applied to the blade 3 is not the clamp member 51 but the auxiliary pin 60. Therefore, the clamp member 51 is not loaded with an external force that causes twisting. Also in this respect, the clamp member 51 can move smoothly, and the blade mounting device 50 Good operability can be maintained over a long period of time.
Various modifications can be made to the second embodiment described above. For example, the configuration in which the electroless nickel plating process is performed as the dust adhesion prevention process (means for making the surface roughness finer than the dust etc.) applied to the clamp member 51 is exemplified. For example, surface hardening such as gas soft nitriding and carburization It is good also as a structure which combines other treatments, such as metal-plating processing, hot-dip plating, vapor deposition plating, etc., grinding | polishing processing, electropolishing, chemical polishing, etc., or the combination of these suitably. By applying these dust prevention treatments to the clamp member, for example, the surface roughness (surface roughness) is finer than that of dust and the like to make it smooth (smooth state) and increase its surface hardness. As a result, it is possible to realize a state in which minute dust or the like is difficult to adhere.

Further, when the base end portion 3b of the blade 3 is inserted into the slit 52a and the regulating member 56 is moved, the operation sleeve 53 is automatically rotated to the clamp side and the blade 3 is clamped. Although the structure which performs the adhesion prevention processing to dust etc. is illustrated in the clamp member in FIG. 1, for example, as explained in the column of the prior art, the clamp member in the blade mounting device in which the blade cannot be mounted unless the operation sleeve is held on the unclamp side The (steel ball 33) can be subjected to an adhesion preventing process such as dust. Even in such a case, the same effect as described above can be obtained.
Moreover, although the clamp member illustrated what forms a pin shape (clamp pin), it can change into what has other shapes, such as a steel ball and a wedge shape.

It is a figure which shows 1st Embodiment of this invention, and is a side view of the front-end | tip part periphery of a reciprocating saw, and a blade attachment apparatus. This figure shows a state where no blade is attached to the blade attachment device. It is a top view around the front-end | tip part of a reciprocating saw. In this figure, the blade mounting device is shown in a cross-sectional view. Further, this drawing shows a state in which no blade is attached to the blade attachment device. It is a cross-sectional view of a blade mounting apparatus. This figure shows a state where a blade is attached. It is a disassembled perspective view of a blade attachment apparatus. FIG. 5 is a cross-sectional view taken along line (5)-(5) in FIG. 1. This figure shows an unclamped state in which the cam surface behind the clamp member is displaced to the larger diameter side, and the clamp member is thereby retracted. It is a perspective view of the blade attachment apparatus in the state where the blade is not attached. It is a perspective view of the blade attachment apparatus of the state which attached the blade. It is a longitudinal cross-sectional view of the blade attachment apparatus of 2nd Embodiment. This figure shows an unclamped state. FIG. 9 is a cross-sectional view taken along line (9)-(9) in FIG. 8, and is a cross-sectional view of the blade mounting device of the second embodiment. It is a longitudinal cross-sectional view of the blade attachment apparatus of 2nd Embodiment. This figure shows a clamped state. It is a (11)-(11) sectional view taken on the line of FIG. 10, and is a cross-sectional view of the blade mounting device of the second embodiment. It is a (12)-(12) line section arrow view of Drawing 10, and is a longitudinal section of a blade attachment device of a 2nd embodiment. It is a disassembled perspective view of the conventional blade mounting apparatus, Comprising: FIG. 1 of US Pat. No. 5,557,071 is used.

DESCRIPTION OF SYMBOLS 1 ... Reciprocating saw 2 ... Rod, 2a ... Slit, 2b ... Guide groove, 2c ... Housing recessed part 3 ... Blade 10 ... Blade attachment apparatus (1st Embodiment)
DESCRIPTION OF SYMBOLS 11 ... Operation sleeve 12 ... Torsion spring 16 ... Guide groove, 16a ... Vertical groove, 16b ... Lateral groove 17 ... Cam surface 18 ... Clamp member 20 ... Restriction member, 21 ... Compression spring 22 ... Restriction pin 30 ... Blade attachment apparatus (conventional)
50 ... Blade mounting device (second embodiment)
51 ... Clamp member 53 ... Operation sleeve 59 ... Auxiliary sleeve 60 ... Auxiliary pin

Claims (5)

A device for inserting a base end portion of a blade into a slit provided at a tip of a rod that reciprocally moves in an axial direction, and attaching the blade to the rod, and a clamp position and an unclamp position at the tip of the rod And a regulating member that locks the operating portion at the unclamping position, and a base end portion of the blade is provided in the slit. A blade attachment device configured to release the locked state of the operation portion at the unclamping position by the restriction member when inserted . The blade attachment device according to claim 1, wherein the operation portion includes a lateral groove along the slit, and a restriction pin of the restriction member is caused to enter the transverse groove to bring the operation portion to the unclamping position. Blade mounting device configured to lock. 3. The blade attachment device according to claim 2, wherein a torsion spring is interposed between the operation portion and the rod, and the operation portion is biased toward the clamp position by the torsion spring. apparatus. 4. The blade mounting device according to claim 3, wherein the operation portion includes an L-shaped guide groove including the horizontal groove and the vertical groove, and the restriction pin is caused to enter the vertical groove to move the operation portion to the vertical groove. Blade attachment device configured to move to the clamp position side. A device for inserting a base end portion of a blade into a slit provided at a tip of a rod that reciprocally moves in an axial direction, and attaching the blade to the rod, and a clamp position and an unclamp position at the tip of the rod And an restricting member that locks the operating portion at the unclamping position, and the restricting member is disposed in the slit. And a blade mounting device spring-biased in a direction to push out the blade from the slit.

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