JPH0413514A - Power reciprocation saw - Google Patents

Abstract

PURPOSE:To reduce a burden on a worker by providing an applied member with a slide member, and moving the slide member almost in the cutting direction to the main body of a reciprocation saw. CONSTITUTION:For an applied member 3, a screw 35 is inserted through a hole 41a to thread a stopper 34 for temporarily holding a tightening means 35 at a tongue member 41, a slide member 32 at which an applied member 31 is pivotally installed is inserted between the stopper 34 and the tongue member 41, and the screw 35 is then tightened to fix the slide member 32 to the tongue member 41 to be installed to a main body 1 of a reciprocation saw. A guide part 32h is engaged with a guide groove 41b at this time, and a protruding part 34a is engaged with an aperture part 32a. For moving this almost in the cutting direction, the tightening means 35 is loosened in such a degree as to move the slide member 32, so the slide member 32 is guided by the guide groove 41b to move. The burden on a worker can thus be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric reciprocating saw used mainly for cutting bar materials.

(Prior Art) As shown in FIGS. 4 to 6, a conventional electric reciprocating saw includes a reciprocating saw body 1. Serrated blade 2. It consists of a contact member 3.

The reciprocating saw body 1 includes a motor device 11. A power transmission conversion device 12 having a power transmission section and a power conversion section, a plunger support device 13 having a plunger 13g. A clamp 14 attached to the plunger support device 13 is built-in. The rotational motion of the motor device 11 of this device is converted into a reciprocating rocking motion of the plunger 13g through a path described later. The rotation of the motor lla is reduced by a speed reduction mechanism of the power transmission section. The rotation of the power transmission section is transmitted to the crank 12i and cam section 12h of the power conversion section. The rotation of the crank 12i causes the plunger 13g to reciprocate due to the action of the crank 12i and a guide plate 13i that is pivotally attached to the plunger 13g. Cam part 12
The rotation h causes the plunger support device 13, one end of which is pivoted, to swing through the action of the roller I3a, which is pivoted to the plunger support device 13, and the cam portion 12h. Therefore, the motor 11. The rotation causes the plunger 13g, which is the output member of the plunger support device 13, to reciprocate and swing.

The sawtooth blade 2 is attached to the plunger 13g via a clamp 14. As a result, the reciprocating rocking motion of the plunger 13g is transmitted to the sawtooth blade 2.

The contact member 3 receives the reaction force R6 of the sawing force of the sawtooth blade 2, and stabilizes the posture of the reciprocating saw body 1 with respect to the object to be cut, Mz, thereby reducing the burden on the operator. This one has one end pivoted to the reciprocating saw body 1 and moves in response to the objects ql and Mz to be cut. As a result, the objects to be cut M, M2 are cut while being sandwiched between the sawtooth blade 2 and the abutment member 3.

As shown in FIG. 4, when cutting steel materials, vibrators, etc. using the electric reciprocating saw described above, the vertical distance from the rotational fulcrum of the contact member 3 to the cutting edge of the sawtooth blade 2 determines the If the radius is small, the contact surface 31 of the contact member 3
The angle θ between this and the axis of the sawtooth blade 2 is an acute angle.

Also, as shown in Fig. 5, the object to be cut M20 is cut from the vertical distance.
If the radius is large, the angle θ will be obtuse. As a result, when the angle θ is acute, the vertical component of the reaction force R of the sawing force generated on the contact member 3 acts upward, that is, the object 1 to be cut is pressed against the sawtooth blade 2, and when the angle θ is an obtuse angle. In this case, the work is directed downward, that is, the workpiece 2 moves away from the sawtooth blade 2. Therefore, the object to be cut Ml,
When cutting by holding M2 in the hand, the holding force of the hand is reduced when the object to be cut -1 has a small diameter, but the holding force of the hand is increased when the object to be cut has a large diameter M2. It will be necessary to do so.

(Problems to be Solved by the Invention) In the electric reciprocating saw as described above, when cutting an object to be cut, such as a steel material or pipe, by hand, the contact member is pivoted at one end to the reciprocating saw body. It moves according to the object to be cut. For this reason, when the object to be cut has a large diameter, the angle θ becomes an obtuse angle, and the vertical component of the reaction force of the sawing force acts to separate the object from the sawtooth blade. As a result,
There is a problem in that it is necessary to increase the force with which the object to be cut is pressed against the sawtooth blade, which increases the burden on the operator.

The present invention has been made in view of the above circumstances, and its purpose is to arrange the abutting member at an angle θ<90° even when cutting a workpiece having the maximum allowable diameter, so that the object is To provide an electric reciprocating saw capable of reducing the burden on a worker by suppressing an increase in force for pressing a cut object against a sawtooth blade.

[Means to solve the problem]

In order to achieve the above object, the electric reciprocating saw of the present invention comprises: a sawtooth blade; a contact member disposed on the side of the sawtooth blade that comes into contact with an object to be cut; and a contact member connected to a power source via a switch. a power transmission conversion device having a power transmission section and a power conversion section connected to the motor device; and a blade mounting section connected to the power conversion section and supporting a sawtooth blade together with a clamp. an electric reciprocating saw comprising: a plunger support device having a plunger; and a reciprocating saw main body having a built-in plunger and pivoting the abutting member; a slide piece rotatably supporting the abutting member; , the slide'
The piece is configured to be movable and fixed to the reciprocating saw body in a direction that substantially advances the cutting.

[Operation] According to the present invention, when cutting an object having the maximum allowable diameter, the abutment member is moved in the direction in which the cutting progresses, thereby changing the point of contact between the abutment member and the object to be cut. It can be taken below the center of an object. As a result, the angle θ between the tangent of the contact point and the axis of the sawtooth blade becomes an acute angle. Therefore, the abutting member maintains an angle θ of 90° during the cutting operation.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 3.

The electric reciprocating saw of the present invention includes a reciprocating saw body 1.
Serrated blade 2. It consists of a contact member 3.

The reciprocating saw body 1 includes a motor device 11. Power transmission conversion device 12. Plunger support device 13. A clamp 14 attached to the plunger support device 13 is built in.

The motor device 11 includes a motor lla having an output shaft 11b connected to a power source via a switch, and a motor lla having an output shaft 11b connected to a power source via a switch.
The pinion llc is integrally fixed to the .

The power transmission conversion device 12 includes a power transmission section and a power conversion section.

The power transmission section includes a high-speed gear 12c that meshes with the pinion 11C and is connected to the shaft 12b via the one-way clutch 12a, an intermediate gear 12d that meshes with the pinion 11C, and a one-way clutch 1 that meshes with the intermediate gear 12d.
A low speed gear 12e is connected to a shaft 12b via a gear 2a. The output shaft 11b transmits high-speed and low-speed power in response to forward and reverse rotation of the output shaft 11b.

The power converter is a crank 12i, which has an eccentric pin 12g fitted with a first roller 12f on one side, and a cam portion 12h that swings a plunger support device 13, which will be described later, on the other side. 12b.

The plunger support device 13 is formed from a bearing stand 13e and a plunger 13g.

The bearing stand 13e has a pin 13b and a pin 13b, which are pivoted on one side and fitted with a 20th lug 13a that contacts the cam portion 12h on the other side.
- Spring 13c for pressing the roller 13a against the cam portion 12h
The receiver has a portion 13d.

The plunger 13g has a blade attachment portion 13, which will be described later, on one side.
h, and a guide plate 13i on the other hand, provided with a long hole that regulates the reciprocating direction and frees the direction perpendicular to the reciprocating direction, and has one end pivoted.
and a pin 13j in the middle for preventing rotation. Then, bearings 13f, 13f are mounted on the bearing stand 13e.
The crank 12i engages with the guide plate 13i and drives the crank 12i to reciprocate.

The blade attachment portion 13h is integrally formed with the plunger 13g by forging, welding, etc., guides the sawtooth blade 2 described later, and engages with a clamp 14 described later.

A clamp (not shown) fits into the blade attachment portion 13h and clamps the sawtooth blade 2 therebetween.

The sawtooth blade 2 has a guide hole 2a and a notch 2b at one end that fit into the clamp and prevent it from coming off due to resistance during cutting, and is supported by the guide surface of the blade attachment part 13h, and is attached to the guide surface by a screw. and clamp 14.

The abutting member 3 includes an abutting piece 31. Slide piece 32. The fastener consists of a tool and is supported by the frame 4.

The contact piece 31 is made of a metal plate, and includes a contact surface 31b having an opening 31a on the side where the sawtooth blade 2 is located, and a locking piece integrally provided on the opposite side surface side of the contact surface 31b. 3
1c and 31d. The locking pieces 31c, 31
d is provided with locking holes 31e and 31f which are pivoted. This has the function of locking onto the slide piece 32 when pivoted and restricting rotation, that is, maintaining the angle θ<90°.

The slide piece 32 is made of a metal plate, and has a slide surface 31b having an opening 32a on the side where the sawtooth blade 2 is located, and a guide portion 32 on the opposite side surface of the slide surface 32b.
h, and integrally have locking pieces 32c and 32d.

The locking pieces 32c, 32d are provided so as to be inscribed in the locking pieces 31c, 31d, and have locking holes 32e, 32f fixed to a rivet shaft 33, which will be described later. The rivet shaft 33.33 has a locking hole 31e, a locking hole 32e, and a locking hole 3.
1f and the locking hole 32d, respectively, and the locking hole 32
e, the part protruding from 32f is caulked to secure the locking piece 32c;
It is fixed to 32d. Further, a stop bar 32g is provided at the mouth of the opening 32a, so that sliding is regulated by a stopper 34, which will be described later.

The tightening tool consists of a stopper 34 and a screw 35. The stopper 34 has a convex portion 34a that engages with the opening 32a and a screw hole into which a screw 35 is screwed. In this case, the slide surface 31b side of the slide piece 32 and one end of the frame 4, which will be described later, are sandwiched between the fastener 34 and the screw 35. As a result, the abutting member 3 is fixed to one end of the reciprocating saw main body l and is supported in a freely relatable manner. The frame 4 is a frame body that supports the motor 11a, the power transmission section, and the bearing stand r3e. This thing has a side where the serrated blade 2 is located,
It has a tongue piece 41 that extends substantially in the cutting direction. The tongue piece 41 has a hole 41a through which the screw 35 passes and a guide groove 41b that engages with the guide portion 32h of the slide piece 32.
is provided. The slide piece 32 can be attached to the tongue piece 41 using this hole 41a.

The abutment member 3 described above is assembled by passing the screw 35 through the hole 41a and screwing the stopper 34 to temporarily hold the fastener on the tongue piece 41. is inserted between the stopper 34 and the tongue piece 41, and then the screw 35 is tightened to fix the slide piece 32 to the tongue piece 41, thereby attaching it to the reciprocating saw body 1. At this time, the guide portion 32
h engages with the guide groove 41b, and the convex portion 34a engages with the opening 32.
engages a.

When this object is to be moved in the direction in which the cutting progresses, the slide piece 32 can be guided by the guide groove 41b and moved by loosening the tightening tool to the extent that the slide piece 32 can be moved. At this time, the convex portion 34a is connected to the screw 35 and the stopper 3.
4 from rotating together, and also locks the Sunstopper 32g to prevent the slide piece 32 from falling off.

〔Effect of the invention〕

In the electric reciprocating saw of the present invention, since the abutment member is moved, even when cutting an object having the maximum allowable diameter, the force pressing the object against the sawtooth blade is reduced, improving cutting work efficiency. .

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the first embodiment of the present invention, FIG. 2 is a sectional view of the main part, FIG. 3 is a perspective view of the main part, and FIG. 4 is a conventional example. FIG. 5 is a cross-sectional view of the main parts. FIG. 6 is the same cross-sectional view. 1- Reciprocating saw main body, 2- Serrated blade, 3- Contact member, 31- Contact piece , 32 - Tightening is by shaft, 34 - Stopper. Patent applicant Matsushita Electric Works Co., Ltd. agent Patent attorney Toshimaru Takemitsu (2 idiots) -□-
two

Claims (1)

[Claims] (1) A sawtooth blade, a contact member disposed on the side of the sawtooth blade that comes into contact with the object to be cut, a motor device having an output section connected to a power source via a switch, and connected to the motor device. a power transmission conversion device having a power transmission portion and a power conversion portion; and a plunger support device having a plunger connected to the power conversion portion and provided with a blade attachment portion that supports a sawtooth blade together with a clamp. and a reciprocating saw body that rotatably supports the abutment member, and a slide piece that rotatably supports the abutment member, and the slide piece is approximately rotated relative to the reciprocating saw body. An electric reciprocating saw characterized by being able to move and fix in the cutting direction.