JP2002011703A - Apparatus for fitting blade of reciprocative cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blade-fitting apparatus capable of fitting the blade with less looseness in order to solve a problem of large looseness because of structure for preventing the blade from coming obb from a slide shaft by fitting a steel ball or a pin into a fitting hole of the blade in a conventional apparatus for fitting the blade to fit the blade to the slide shaft of a reciprocative saw. SOLUTION: A structure is equipped with two pieces of clamp components 22 and 23 which can be mutually indepenently moved in a thickness direction of the blade B by being fitted to the slide shaft 3; and a control component 25 interposed between two clamp components 22 and 23 and an operation sleeve 13, and holding one side clamp component 23 in a state of being fitted in a fitting hole Ba of the blade B and holding the other clamp component 22 in a state of butting a side of the blade B when the operation sleeve 13 is moved to a clamp position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art For example, in a reciprocating saw, a slide shaft is reciprocated in its axial direction via a motor and a reciprocating conversion mechanism for converting the rotation of the motor into reciprocating motion. The cutting material is cut by reciprocating the blade, and a blade mounting device described below is provided as a device for mounting the blade to the tip of the slide shaft. Conventional blade mounting devices are disclosed, for example, in US Pat.
When the base end of the blade is inserted into a slit formed at the tip of the slide shaft as disclosed in Japanese Patent Publication No. 71,
One steel ball provided at the distal end of the slide shaft is fitted into one mounting hole formed at the base end of the blade, and the movement of the steel ball in the fitted state is regulated by an operating sleeve that is spring-biased toward the clamp. By doing so, the blade is kept pressed against the side of the slit, and the blade is clamped so as not to come off from the tip of the slide shaft. In addition, there has been provided a configuration in which the same function is provided by fitting the tapered portion of a pin having a tapered tip into a mounting hole instead of the steel ball.

[0003]

As described above, according to the conventional blade mounting apparatus, one steel ball or taper pin is fitted into one mounting hole formed at the base end of the blade, and the side of the slit is inserted into one side. Since the structure is such that it is prevented from coming off by pressing, there is a problem that the blade in the attached state has a large rattling. SUMMARY OF THE INVENTION It is an object of the present invention to provide a blade mounting device that can mount a blade in a state in which there is less rattling than before.

[0004]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a blade mounting apparatus having the structure described in each of the claims. According to the blade mounting device of the first aspect, when the operation sleeve is positioned at the clamp position, one of the clamp members is held in a state of being fitted into the mounting hole of the blade, and the other clamp member is connected to the side surface of the blade. , So that the blade is prevented from coming off the slide shaft, and the rattling thereof is more reliably prevented than before.

According to the second aspect of the present invention, when the user stops the operation of the operation sleeve in the unclamping direction, the operation sleeve moves to the clamp position by the biasing force of the spring, and the blade is mounted on the slide shaft. Therefore, the blade mounting operation is simplified. According to the blade mounting device of the third aspect, it is possible to prevent the blade from coming off and to prevent rattling with a simple configuration.

[0006]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG. FIG. 1 shows the tip of a reciprocating saw 1 as an example of a reciprocating cutting tool. The present embodiment has a feature in a blade mounting device 10 for mounting a blade B to the reciprocating saw 1, and the basic configuration of the reciprocating saw 1 itself is the same as a conventionally known configuration, and particularly needs to be changed. do not do. Figure 1
Reference numeral 2 denotes a housing of the reciprocating saw 1, and a slide shaft 3 is supported inside the housing 2. The slide shaft 3 is supported by two bearings 4 at the front and rear in the axial direction (rear bearings are not shown in the figure) so as to be movable in the horizontal direction in the figure. The slide shaft 3 is driven by an electric motor built in the rear portion of the reciprocating saw 1 as a drive source in the axial direction (left and right directions in the figure).
To reciprocate. The mechanism for converting the rotation of the electric motor into the reciprocating motion of the slide shaft 3 does not need to be particularly changed as compared with the conventional configuration, and therefore the description is omitted.

The blade mounting device 10 of the present embodiment is mounted on the tip of the slide shaft 3. Details of the blade mounting device 10 are shown in FIGS. The blade attachment device 10 includes an operation sleeve 13 provided at the tip of the slide shaft 3 so as to be movable in the axial direction, and two operation sleeves attached to the slide shaft 3 and movable independently of each other in the thickness direction of the blade B. The clamp members 22 and 23 are interposed between the two clamp members 22 and 23 and the operation sleeve 13. When the operation sleeve 13 is moved to the clamp position, the rear clamp member 23 is moved.
And a regulating member 25 for holding the front clamp member 22 pressed against the blade B while holding the front clamp member 22 in the mounting hole Ba of the blade B.

The operating sleeve 13 is moved between a clamp position on the distal end side of the slide shaft 3 and an unclamped position axially rearward of the clamp position. A compression spring 14 is interposed between a rear portion of the operation sleeve 13 and a flange 3a fixed to the slide shaft 3.
For this reason, the operation sleeve 13 is urged to the clamp position side (right side in the figure). The movement of the operation sleeve 13 to the unclamping position side is performed against the compression spring 14 by the operation of the user of the reciprocating saw 1. On the side of the operation sleeve 13, a finger contact portion 15 is provided for preventing a finger applied when the user retreats the operation sleeve 13 to the unclamping position side. A cam surface 13a is formed on the inner surface of the operation sleeve 13 so as to be inclined in a direction away from the center (slide shaft 3) toward the distal end. The cam surface 13a is formed in an arc surface centered on the central axis in a certain angular range around the central axis of the operation sleeve 13. This cam surface 13
a will be described later.

At the tip of the slide shaft 3, there is formed a slit 3b for inserting the base end of the blade B.
An extruding piece 17 is incorporated in a deep portion of the slit 3b in a state where the extruding piece 17 is urged by a compression spring 16 in a blade pushing direction (rightward in the drawing). When the operation sleeve 13 is operated to the unclamping side, the slit 3b
The blade B inside is pushed out of the slit 3b by the pushing piece 17, so that the blade B can be easily removed from the blade mounting device 10. A holder 20 is attached to the tip of the slide shaft 3. The holder 20 is fixed to the slide shaft 3 by bolts 21. The holder 20 has two holding holes 20a and 20b. The two holding holes 20a and 20b are arranged side by side along the axial direction of the slide shaft 3.

Pin-shaped clamp members 22, 23 are respectively mounted on the holding holes 20a, 20b so as to be movable in the axial direction. The two clamp members 22 and 23 have the same shape, and each is formed in a tapered shape on the tip side (the lower side in FIG. 3). The clamp members 22, 23 are shown alone in FIG. Hereinafter, FIG.
3, the clamp member 22 attached to the right holding hole 20a is referred to as a first clamp member 22, and the clamp member 23 attached to the left holding hole 20b in FIG. 3 is referred to as a second clamp member 23. Both clamp members 22 and 23 are
The holding holes 20a and 20b are held so as to be movable in the radial direction of the slide shaft 3, whereby the tapered portions 22b and 23b on the tip side thereof are respectively directed to the blade B as shown in FIG. Hemispherical concave portions 22a, 23a are provided on rear surfaces (upper surfaces in the figure) of both clamp members 22, 23.
Are formed. Protrusions 25a, 25b of a regulating member 25 described below are fitted into the two recesses 22a, 23a, respectively.

The regulating member 25 is shown alone in FIG. The restricting member 25 has a substantially block shape as shown in the figure, and the lower surface of the restricting member 25 has the convex portions 25a, 2a.
5b are formed. The two convex portions 25a and 25b have a hemispherical shape with a slightly smaller radius of curvature than the concave portions 22a and 23a of the clamp member 23. For this reason, the biconvex portion 2
5a and 25b are slidably contacted with the concave portions 22a and 23a at one point, thereby forming the convex portions 25 with respect to the concave portions 22a and 23a.
The inclination of all directions of a and 25b is allowed. The upper surface of the regulating member 25 is formed in a mountain shape, and a top portion 25c is formed substantially at the center in the front-rear direction. The top 25c is a portion that slides on a cam surface 13a formed on the inner surface of the operation sleeve 13. The top 25c and the inclined surface 25 that extends back and forth from the top 25c.
d and 25e are formed in an arc shape in the width direction according to the arc shape of the cam surface 13a.

As shown in FIG. 3, the restricting member 25 extends between the first and second clamp members 22 and 23 and between the two clamp members 22 and 23 and the cam surface 13a of the operation sleeve 13. It is interposed. The front convex portion 25a of the regulating member 25 is in sliding contact with the concave portion 22a of the first clamp member 22 while the rear convex portion 25b is fitted in the concave portion 23a of the second clamp member 23. Are in sliding contact. As described above, the top 25c of the regulating member 25 is always in sliding contact with the cam surface 13a, and the operating sleeve 13 is constantly urged toward the clamp position by the compression spring 14. For this reason, as shown in FIG. 3, in a state where the operation sleeve 13 is located at the clamp position by the urging force of the compression spring 14, the regulating member 25 is brought into sliding contact with the cam surface 13a and the top portion 25c by the two clamp members 22, 23. Side, whereby the movement of the clamp members 22 and 23 in the direction away from the blade B (upward in FIG. 3, hereinafter referred to as unclamping direction) is restricted.

When the base end of the blade B is inserted into the slit 3b of the slide shaft 3, the tapered portion 23b of the second clamp member 23 on the rear side fits into the mounting hole Ba of the blade B. The inclination angle and diameter of the tapered portion 23b are determined by the size of the mounting hole Ba and the blade B so that the tip of the tapered portion 23b does not hit the side portion of the slit 3b in the state of being fitted into the mounting hole Ba. It is set in consideration of the plate thickness. Therefore, the base end of the blade B is firmly pressed against the side of the slit 3b by the second clamp member 23. The state where the second clamp member 23 is fitted into the mounting hole Ba is determined by the operation sleeve 1.
3 is held at the clamp position by restricting the movement of the second clamp member 23 in the unclamping direction, whereby the mounting state of the blade B to the slide shaft 3 is locked. Further, when the operation sleeve 13 is located at the clamp position, the first clamp member 22 on the front side is directly abutted on the side surface of the blade B via the regulating member 25, so that the base end of the blade B is located on the side of the slit 3b. Pressed against the part. Thus, the first on the front side
The clamp member 22 is abutted against the side surface of the blade B,
The tapered portion 23b of the second clamp member 23 has the mounting hole B
The blade B is pressed against the mouth of
It is pressed and fixed to the side of the slit 3b by the clamp members 22 and 23 at the locations.

Also, for example, when an external force is applied to the blade B in the removal direction during a cutting operation or the like, the external force passes through the contact state between the mounting hole Ba and the tapered portion 23b to the second position.
It acts in a direction to move the clamp member 23 in the unclamping direction. However, when the second clamp member 23 moves in the unclamping direction, the regulating member 25 is tilted clockwise in FIG. 3 around the top 25c. When the regulating member 25 tilts in the same direction,
The first clamp member 22 presses more strongly against the side surface of the blade B. From this, the external force for pulling the blade B out of the slit 3b is consequently the first force.
It acts with a force that presses the clamp member 22 more strongly against the blade B, so that the mounting state of the blade B is firmly maintained.

Next, when the operating sleeve 13 is retracted in the unclamping direction against the compression spring 14, the regulating member 25
, The cam surface 13a is displaced leftward in the figure, so that the restriction member 25 is allowed to displace in the unclamping direction, whereby the movement of both clamp members 22, 23 in the unclamping direction is allowed. Will be done. In this state, the base end of the blade B can be inserted into the slit 3b of the slide shaft 3, and the blade B can be pulled out from the slit 3b. The insertion of the base end portion is performed while the extruding piece 17 incorporated in the depth of the slit 3b is moved in the pushing direction against the compression spring 16. After the blade B has been inserted to the predetermined position, when the retreating operation of the operation sleeve 13 is stopped, the operation sleeve 13 is moved to the clamp position by the compression spring 14, whereby the blade B is firmly fixed as described above. When the operating sleeve 13 is retracted in the unclamping direction against the compression spring 14, the two clamping members 22,
23 can be moved in the unclamping direction, so that the blade B
Get out of.

According to the blade mounting apparatus 10 of the present embodiment configured as described above, the blade B is fixed by the two first and second clamp members 22 and 23 which are arranged at regular intervals in the longitudinal direction of the blade B. Is attached to the slide shaft 3 by being pressed against the side portion of the slit 3b, so that it can be mounted in a state with less rattling as compared with the conventional configuration in which the steel ball or pin prevents the slide shaft 3 from coming off. Further, according to the mounting device 10 of the present embodiment, when an external force in the pull-out direction is applied to the blade B, the external force acts as a force for tilting the regulating member 25 via the second clamp member 23, and as a result, Since the one clamp member 22 is firmly pressed by the blade B, the rattling of the blade B in the attached state can be reduced in this point as well.

Conversely, when an external force (external force in the thickness direction) is applied to the blade B in the direction of peeling from the side of the slit 3b, the external force moves the first clamp member 23 in the unclamping direction. It acts as a force, and consequently acts as a force to tilt the regulating member 25 counterclockwise in FIG. 3 about its top 25c. The force that causes the regulating member 25 to tilt in the same direction is
Acts as a force for moving the second clamp member 23 in the clamping direction, thereby firmly attaching the second clamp member 23 to the mounting hole B.
Acts as a force for pressing against a. Thus, the unclamping which acts on one of the two clamp members 22 and 23 through the configuration (seesaw function of the regulating member 25) in which the regulating member 25 can be tilted left and right about the top 25c. Since the force in the direction acts as the force in the clamp direction on the other side, the blade B can be held more firmly without rattling than in the related art.

Various modifications can be made to the embodiment described above. For example, the second clamp member 2 on the rear side
3 is fitted into the mounting hole Ba of the blade B, and the first clamp member 22 on the front side is directly abutted against the side surface of the blade B. However, the reverse configuration may be adopted. That is, the first clamp member 22 on the front side may be fitted into the mounting hole Ba of the blade B, and the second clamp member 23 on the rear side may directly contact the side surface of the blade B. Further, from this, the two types of blades B can be mounted in exactly the same state with respect to the position of the mounting hole Ba. Further, the reciprocating saw 1 is illustrated as a reciprocating cutting tool, but the present invention can be similarly applied to other reciprocating cutting tools such as a jigsaw.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, and is a side view of an internal structure of a tip portion of a reciprocating saw and a blade mounting device.

FIG. 2 is a plan view showing a tip portion of the reciprocating saw and an internal structure of the blade attaching device.

FIG. 3 is a side view showing the internal structure of the blade mounting device.

FIG. 4 is a perspective view of first and second clamp members.

FIG. 5 is a perspective view of a regulating member.

[Explanation of symbols]

B ... Blade, Ba ... Mounting hole 1 ... Reciprocating saw (reciprocating cutting tool) 2 ... Housing 3 ... Slide shaft, 3a ... Flange part, 3b ... Slit 4 ... Bearing 10 ... Blade mounting device 13 ... Operation sleeve, 13a ... Cam surface DESCRIPTION OF SYMBOLS 14 ... Compression spring 15 ... Finger contact part 16 ... Compression spring 17 ... Extrusion piece 20 ... Holder, 20a, 20b ... Holding hole 21 ... Bolt 22 ... First clamp member, 22a ... Depression, 22b ... Tapered part 23 ... Second clamp Member, 23a: concave portion, 23b: tapered portion 25: regulating member 25a, 25b: convex portion, 25c: top portion, 25d, 25e
… Inclined surface

Claims (3)

[Claims] When an operating sleeve is moved to a clamp position with respect to a slide shaft of a reciprocating cutting tool, a blade is non-removably clamped with respect to the slide shaft,
When the operation sleeve is moved to the unclamping position,
A blade attachment device capable of detaching the blade from the slide shaft, comprising two clamp members attached to the slide shaft and movable independently of each other in a thickness direction of the blade.
Interposed between the two clamp members and the operation sleeve, and when the operation sleeve is moved to the clamp position, the one clamp member is held in a state fitted in the mounting hole of the blade, A blade mounting device including a regulating member that holds the other clamp member in a state where the clamp member abuts against a side surface of the blade. 2. The blade mounting device according to claim 1, wherein the operation sleeve is supported movably in the axial direction of the slide shaft, and is spring-biased toward the clamp position. 3. The blade mounting device according to claim 1, wherein a cam surface having a variable inner diameter is provided on the inner surface of the operation sleeve, and a mountain-shaped top is provided on the regulating member, and the top is slid on the cam surface. The blade attachment is configured such that the regulating member is interposed in such a manner as to be capable of tilting left and right, and an external force in the unclamping direction acting on one of the clamping members acts as an external force in the clamping direction on the other clamping member. apparatus.