JP2001179534A - Reciprocating power tool - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a reciprocating power tool which is small and lightweight, grips the blade more securely, and can attach and detach the blade with one touch. SOLUTION: One end of a groove of a rotary lever 5 for gripping at least the blade 4 is a V-shaped surface 22 and a V-shaped surface of the rotary lever 5 is attached to a blade mounting portion of a plunger 3.
A vertical groove 14 and an upper groove 11 each having a V-shape are provided on a vertical surface facing the V-shaped surface 22 and an upper surface located above the blade 4, and at least the three grooves 22, 14, 1
1, the blade 4 was gripped and fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating tool, such as a jigsaw or a saver saw, in which a blade mounted on the tip of a plunger can be attached and detached without using a tool.

[0002]

2. Description of the Related Art An example of a conventional reciprocating power tool is shown in FIG.
The conventional reciprocating power tool shown in FIG.
No. 9583, a lever having a groove 20 which is slightly larger than a blade width which allows the blade 4 to penetrate the blade mounting portion 3 of the plunger 1 which reciprocates up and down and has V-shaped ends at both ends. 5, a pressing load by a spring 9 is applied to the lever 5, and the blade 4 is gripped and fixed between the V-grooves 20 at both ends of the lever 5, so that the lever 5 can be held without using a tool or the like. By rotating the blade, the blade 4 can be attached and detached, and the operability is good.

However, in the conventional reciprocating tool described above, when a blade 4 having a small blade width and a small thickness is mounted, as shown in FIG. 6, a gap a is formed between the blade width and the plunger wall. This causes the blade 4 to move within the blade mounting portion 3 of the plunger 1, and further has the disadvantage that chips enter the gap during the cutting operation.

As a reciprocating power tool for compensating the above-mentioned disadvantages, EP
There is a reciprocating power tool described in Japanese Patent No. 0792713. Since the release device corresponding to the lever 5 and the retaining member corresponding to the V-groove 20 of the lever 5 are separately provided and the blade 4 penetrates when the release device is lifted, the retaining member moves away from the fulcrum of the release device. The blade is moved in the direction, and the blade is gripped and fixed between the V groove provided in the plunger wall and the V groove of the retaining member.

[0005]

However, EP 079
The reciprocating power tool described in the 2713 publication has a release device corresponding to the lever 5 and a retaining member corresponding to the V-groove 20 as separate bodies, and furthermore, a large spring load to directly apply a large spring load to the retaining member. Also, the retaining member must be rugged to support the spring load. In addition, lifting the end of the release device upwards places a greater load on the finger as the retaining member approaches the lifting finger. To avoid straining the fingers, the release device had to be extended as far as possible from the retaining member, and the fingers had to lift the release device before inserting the blade, so this mechanism could not be a compact structure . In this regard, utility model registration No. 25
In the reciprocating power tool disclosed in Japanese Patent No. 19583, the biasing position by the spring 9 is farther from the fulcrum than the pressing position of the blade 4, so that only a small spring load is required because of the moment. Although there is no gap between the chips during the cutting operation and there is no problem, if the blades 4 are inserted without discharging the chips once inside the plunger, the blades 4 may be attached to the blade mounting portion. There is also a possibility that the cutting operation may not be stable because the user may get on the chips in the inside 3 and be gripped at only two points of the V groove 20 of the lever 5. Furthermore, since the release device and the retaining member are separate bodies, chips may enter between the release device and the retaining member, and the retaining member may not move smoothly.

SUMMARY OF THE INVENTION An object of the present invention is to provide a reciprocating tool which solves the above-mentioned drawbacks, is small in size and light in weight, more reliably grips the blade, and can attach and detach the blade with one touch.

[0007]

The object of the present invention is to form at least one end of a groove of a rotary lever for gripping a blade into a V-shaped surface, and to attach a blade mounting portion of the plunger to a V-shaped surface of the rotary lever. This is achieved by providing a vertical groove and an upper groove each having a V-shape on the vertical surface and the upper surface located above the blade, and gripping and fixing the blade with at least the three grooves.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a reciprocating power tool according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of an essential part showing an embodiment of the reciprocating power tool of the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. The plunger 1 includes a shaft portion 2 and a blade mounting portion 3 for attaching and detaching the blade 4. A base 7 for supporting a pin 6 serving as a fulcrum of the rotary lever 5 protrudes from the outer periphery of the blade mounting portion 3, and the base 7 is provided with a pin hole 8 for loosely passing the pin 6. A spring holding portion 10 for holding the spring 9 protrudes from the outer peripheral surface opposite to the base 7. On the other hand, the inside of the holding portion 3 is hollowed out in a cylindrical shape, and a V-shaped upper groove 11 is formed in the upper surface on the shaft 2 side, and a through-slot 12 through which the blade 4 passes is axially penetrated. The shape holder 13 is fitted. The shape of the through slot 12 of the cylindrical holder 13 is such that the surface on the fulcrum side has a V-shaped vertical groove 14 in the axial direction.
The grooves are arranged in series, and the groove shape on the side of the spring holding portion 10 forms a plane. The blade mounting portion 3 and the holder 13 house the rotary lever 5 therein, and have cutout windows 15 and 16 for rotating at a predetermined angle, respectively. On the other hand, the rotation lever 5 is rotatably fixed to the base 7 by inserting the pin 6 into a pin hole 17 formed at one end by press-fitting. The rotation lever 5 has a rectangular shape, and has a pin hole 17 at one end.
The other end has a seat 19 for locking the spring 9 and serves as a part to which a finger is put. A long slot 20 having a groove width and length through which the blade 4 can be inserted is formed substantially at the center of the rotary lever 5. As for the shape, the surface on the fulcrum side has a substantially planar shape 21 and the opposing surface has a V-shaped shape 22. Rotating lever 5
Penetrates through the inside of the plunger and is constantly urged to the lower end side of the blade mounting portion 3 by a spring 9 installed outside the plunger. The operation of the reciprocating power tool of the present invention configured as described above will be described below.

When the blade 4 is inserted into the through-hole 12 of the holder 13 in the blade mounting portion 3, the tip of the blade 4 pushes up the rotating lever 5 against the urging force of the spring 9, and the rotating lever 5 is moved to a predetermined position. It passes through the inside of the long groove 20 and further strikes the upper groove 11 of the blade mounting portion 3. At this time, the cutting chips on the vertical grooves 14 are partially pushed into the gaps between the vertical grooves 14 by the blade 4. Here, when the blade 4 is released, the V-shaped surface 22 of the rotary lever 5 urged by the spring 9
The blade is firmly gripped between the two vertical grooves 14 of the holder 13 and the upper groove 11. When a switch (not shown) is pulled from this state, the motor rotates and the eccentric pin mounted eccentrically to the gear causes the plunger 1 to move up and down and start cutting the material by the blade 4. Naturally, since the material is cut when the blade 4 is pulled up, the blade 4 is pulled downward by the cutting resistance, but the V-shaped surface 22 of the rotating lever 5 bites into the blade 4 and the two vertical grooves 14 of the holder 13 The gripping force is firmly held.

The upper groove 11 and the vertical groove 14 define the blade 4
Is prevented from falling left and right. To remove the blade 4, the gripping force is released only by lifting the rotary lever 5 upward with a finger against the urging force of the spring 9, and the blade is released. 3 and 4 show another embodiment.

The rotary lever 5 does not penetrate the inside of the blade mounting portion 3 but passes through the outer peripheral portion of the plunger and grips the blade. The width between the arms 23 is wider than the blade mounting portion 3, and the arm 23 is mounted so that the rotary lever 5 is fitted into the blade mounting portion 3 from the spring 9 side.
Assembly is simplified, and the blade mounting part 3 and holder 1
Notch window 1 for passing rotary holder 5 through vertical groove 14
Since the parts 5 and 16 become unnecessary, the strength is increased, the length of each of the vertical grooves 14 can be increased, and the gripping force is also increased.

FIG. 5 shows another embodiment of the reciprocating power tool of the present invention. As shown in the figure, the present embodiment has a configuration in which a roller 24 having a V-shaped surface is mounted in a long groove 20 of a rotary lever, and the roller 24 is rotatable via a roller pin 25 press-fitted and fixed to the rotary lever 5. Mounted on With such a configuration, the roller 24 in contact with the blade 4 rotates, so that the contact surface with the blade 4 changes and the life can be improved.

[0013]

As described above, according to the present invention, at least one end of the groove of the rotary lever for gripping the blade has a V-shape, and the blade mounting portion of the plunger is opposed to the V-shape of the rotary lever. A vertical groove having a V-shape and an upper groove each having a V-shape are provided on an upper surface located above the blade and a vertical surface to be formed, and the blade is gripped and fixed by at least the three grooves. Therefore, it is possible to provide a reciprocating tool that can more reliably hold the blade and can attach and detach the blade with one touch.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of a reciprocating power tool of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view of a main part showing another embodiment of the reciprocating power tool of the present invention.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is a cross-sectional plan view showing another embodiment of the rotary lever constituting the reciprocating tool of the present invention.

FIG. 6 is a sectional view of a main part showing an example of a conventional reciprocating power tool.

[Explanation of symbols]

1 is a plunger, 5 is a rotation lever, 11 is an upper groove, 12 is a through-slot, 13 is a holder, 14 is a vertical groove, and 20 is a long slot.

Claims (3)

[Claims] 1. A plunger, which is held reciprocally by a main body and has a blade mounting portion to which a blade is mounted at a lower end, and a rotary lever rotatably provided on the plunger and having a groove portion through which the blade is inserted. A reciprocating movement tool, wherein at least one end of the groove portion of the rotary lever that grips the blade has a V-shaped surface, and a vertical surface opposed to the V-shaped surface of the rotary lever is provided at a blade mounting portion of the plunger. A reciprocating tool, wherein a vertical groove and an upper groove each having a V-shape are provided on an upper surface located above the blade, and the blade is gripped and fixed by at least the three grooves. 2. The vertical groove is divided into two and arranged in series, and a blade surface comes into contact with a V-shaped surface of the rotary lever facing between the vertical grooves. The reciprocating power tool according to claim 1, wherein 3. The reciprocating power tool according to claim 1, wherein a rotary roller having a V-shaped surface is provided at one end of the rotary lever for gripping a blade.