JPH06155401A - Power saw - Google Patents

Abstract

PURPOSE:To provide a power saw constituted so as to reciprocally moving a plate shaped saw blade by a power source such as an electromotor or compressed air and having a structure generating no reaction. CONSTITUTION:Plate-shaped saw blades 1A, 1B are fixed to a fixing mechaism 2B so as to be rubbed with each other in a mutual close contact state and driven so as to be alternately reciprocally moved by a disc 4 and cranks 5A,5B rotationally driven by an electromotor. Since two shafts provided to the disc are present at the symetric positions with respect to the center of the disc, the saw blades 1A, 1B are alterantely reciprocally moved so that one saw blade 1A is pushed and the other saw blade 1B is pulled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a saw having a structure in which a plate-shaped saw blade is reciprocated by a power source such as an electric motor or compressed air.

[0002]

2. Description of the Related Art A conventional power saw is constructed such that a rotary motion of a power source such as an electric motor is converted into a reciprocating motion by a crank mechanism and a saw blade is reciprocated to cut a plate or the like. It had been.

[0003]

However, when one saw blade is reciprocated at a high speed, there is a problem that the saw body is recoiled. Especially when starting up and when the saw blade is loaded, a large reaction occurs. In order to counteract the recoil, sufficient force is required, so both hands must be supported, which makes work difficult.

Further, there is a risk that the vibration due to the recoil will be transmitted to the arm and it will be difficult to carry out the work, and eventually the vibration will cause damage to the human body.

Therefore, the present invention has been made for the purpose of providing a saw having a structure in which no recoil occurs.

[0006]

In view of the above object, in the present invention, two plate-shaped saw blades are supported so as to be capable of reciprocating while rubbing against each other, and the two saw blades are alternately arranged. A means for providing an alternating drive mechanism for reciprocating is taken. Further, the alternating drive mechanism may include an electric motor and a crank mechanism that converts the rotational movement of the electric motor into a reciprocating movement.

Further, the two plate-shaped saw blades may be supported by the alternate reciprocating drive mechanism by means of dovetail grooves provided with a tightening screw.

[0008]

According to the power saw of the present invention, two plate-shaped saw blades are supported so as to be able to reciprocate while rubbing against each other, and the two saw blades are alternately reciprocated by an alternating drive mechanism. Therefore, the reaction caused by the movement of the saw blades when cutting the plate to be cut cancels each other out, and the reaction does not occur in the operator.

If the alternating drive mechanism is composed of an electric motor and a crank mechanism for converting the rotational movement of the electric motor into a reciprocating movement, the two saw blades are alternately reciprocally driven by a simple mechanism. It Further, since the saw blade is fitted into the dovetail groove and fixed, and further tightened by a tightening screw, it is securely fixed to the alternating drive mechanism.

[0010]

Embodiments of the power saw of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a plan sectional view of the power saw of the above embodiment, FIG. 2 is a side sectional view of the power saw, and FIG. 3 is a perspective view of a part of a fixing mechanism of the power saw.

1 and 2, 1A is a plate-shaped saw blade,
2A is a fixing mechanism for fixing the saw blade 1A. 1B is a plate-shaped saw blade similar to the saw blade 1A.
It is fixed by the fixing mechanism 2B in a state of being in close contact with.
Reference numeral 3 is an electric motor as a power source, and 4 is a disk rotatably driven by the electric motor 3. A belt is hung on the large diameter portion 4A of the disc 4, and the small diameter portions 4B on both sides of the large diameter portion 4A are supported by bearings.

The two shafts 4C and 4D which are symmetrical with respect to the center of the outer portion of the small diameter portion 4B and the shafts 21A and 21B at the rear ends of the fixing mechanisms 2A and 2B are cranks 5A and 5B. It is connected. The saw blades 1A, 1B
Has a structure as shown in FIG. 4 so that it can be cut when pushed and pulled. In FIG. 4, only one saw blade is shown.

When the switch 6 is turned on, power is supplied from the battery 7 and the electric motor 3 starts rotating.
The rotation of the electric motor 3 is transmitted to the disc 4 via a belt. The rotary motion of the disk 4 is caused by the cranks 5A, 5B.
Is converted into a reciprocating motion of the fixing mechanisms 2A and 2B. Reference numerals 8A and 8B denote support mechanisms that slidably support the fixing mechanisms 2A and 2B.

At this time, since the two shafts 4C and 4D provided on the disc are symmetrical with respect to the center, when one saw blade 1A pushes, the other saw blade 1B is pulled alternately. Move back and forth.

Therefore, when the plate is cut by the power saw, a force for pulling the main body is generated due to a reaction of pulling by one saw blade 1A. However, at the same time, a force that pushes the main body is generated by the reaction of the other saw blade 1B pushing. Further, when the saw blade 1A pushes, a force that pushes the main body is generated by the reaction, and when the other saw blade 1B pulls, a force that pulls the main body is generated by the reaction. In this way, opposite forces are generated, canceling each other out, and the recoil is not transmitted to the hand holding the body.

Therefore, the operator only has to hold with one hand and push down the portion of the saw blade, so that the effect of efficient work can be obtained. Since there is no recoil, there is less fatigue,
The effect of preventing adverse effects on the human body can be obtained.

Further, this power saw can not only cut a plate or the like from the end like an ordinary saw, but also can easily hollow a plate wall. That is, when the tip of the saw blade is obliquely applied to the plate wall, a hole is gradually formed by the tip of the saw blade, and a hole having a size through which the saw blade passes can be easily formed. Once the holes have been drilled, it is easy to open the holes and drill holes of a desired size.

In this way, it is possible to easily provide a hole or the like in which an embedded switch or the like is provided in interior work of a building or the like. Not only on the wall but also in the work of making holes or cutting in places where it is difficult to work, such as the ceiling, the conventional electric saw has a large recoil, so it was necessary to work while supporting it with both hands. According to this power saw, since there is no recoil, it is possible to obtain the effect of being able to work with one hand.

In this power saw, since the two saw blades must be fixed so as to reciprocate while rubbing against each other, the saw blade fixing mechanism is not suitable in the conventional structure. This power saw is provided with a fixing mechanism 2A as shown in FIG. This is because the base of the saw blade is inserted into the dovetail groove 22A provided on the facing surfaces of both fixing mechanisms, and the tightening screw 23A is tightened to tighten the base of the saw blade. To fix.

By fixing in this way, both saw blades can reciprocate while rubbing in close contact with each other. Note that only one side is shown in FIG. In addition, in order to prevent the lateral movement of the two fixing mechanisms 2A and 2B to which the saw blades are fixed, respectively, the supporting mechanisms 8A,
Support by pressing from both sides while lubricating with 8B.

In the above embodiment, since the battery is used as the power source, the battery can be repeatedly charged and used, and the power cord that interferes is also provided, so that it is possible to obtain the effect of being able to work extremely comfortably and efficiently. . But,
It may be supplied from an AC power source, or a fluid such as compressed air can be used as a power source.

[0022]

As described above, according to the power saw of the present invention,
Since it is configured to reciprocate the two saw blades,
The reaction caused by the cutting work is canceled, and the work can be made extremely comfortable. Since this power saw is easy to hold and work with one hand, it is also convenient for cutting walls and ceiling boards.

Further, since the saw blade is fixed to the alternate drive mechanism by the dovetail groove, it can be securely fixed.

[Brief description of drawings]

FIG. 1 is a plan sectional view of an embodiment of a power saw of the present invention.

FIG. 2 is a side sectional view of the power saw.

FIG. 3 is a perspective view of a fixing mechanism of a part of the power saw.

FIG. 4 is a partially enlarged cross-sectional perspective view of a saw blade of the power saw.

[Explanation of symbols]

 1A, 1B Plate-shaped saw blades 2A, 2B Fixing mechanism 3 Power source, electric motor 4 Discs 5A, 5B Crank, crank mechanism 4, 5A, 5B Alternate drive mechanism 22A Groove 23A Tightening screw

Claims (3)

[Claims] 1. An alternating drive mechanism for supporting two plate-shaped saw blades so that they can reciprocate while rubbing each other and for alternately reciprocating the two saw blades. Power saw. 2. The power saw according to claim 1, wherein the alternating drive mechanism includes an electric motor and a crank mechanism that converts a rotational movement of the electric motor into a reciprocating movement. 3. The power saw according to claim 1, wherein the two plate-shaped saw blades are supported by the alternate reciprocating drive mechanism by means of dovetail grooves having a tightening screw.