JPH0752067A - Battery type cutting tool - Google Patents

Abstract

PURPOSE:To ensure a safety during resetting of a beaker provided in a tool body and adapted to be operated upon overload of a motor, by removable providing a battery in a battery mounting part formed in a tool body, and by providing a resetting part for the breaker, in the battery mounting part. CONSTITUTION:A circular saw as a battery type cutting tool is composed of a tool body 1, a saw blade adapted to be driven by a motor 4 and attached to the tool body 1, and a breaker 5 adapted to be operated upon overload of the motor 4, and located in the rear part of the tool body 1. The breaker 5 is provided thereto with a resetting button 6a as a resetting part 6 for resetting the breaker 5. In this case, the resetting button 6a is located inward of an opening part 14 formed in the inner wall of the battery mounting part 2, and the resetting button 6a is carried out by a finger inserted through the opening part 14 after a battery 3 is removed. Accordingly, it is possible to prevent the cutting saw from rotating simultaneously with the resetting of the breaker 5. Thereby it is possible to ensure the safety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-operated cutting tool such as a circular saw, a grinder, a jigsaw, and a reciprocating saw having a detachable battery.

[0002]

2. Description of the Related Art Most battery-powered cutting tools of recent years have a built-in breaker as an overload protection device, and there is a high possibility that a motor or a battery pack will be burnt if the locked state is continued. For drills and hammer drills as drilling tools, mechanically operate the overload prevention clutch to deal with it, but for cutting tools such as circular saws, many require rotational speed and torque, The clutch setting is difficult.

[0003]

By the way, recently, a high-voltage battery has appeared with the improvement of battery performance (small size, high capacity) and development of charging technology for a charger. For this reason, when a high-voltage battery is locked, it often burns out in a shorter time than a conventional battery, and a tool with a high-performance battery particularly needs a lock protection device or the like on the main body side.

Some AC tools have a built-in breaker as a lock protection, but even if the breaker operates, the main switch trigger can be pulled in, and the saw blade may suddenly start moving when the breaker is returned. There is
It is very dangerous. In particular, a tool having a switch lock function that can lock the switch in the ON state without continuously holding the switch on the main body side has a problem of higher danger.

The present invention is intended to solve the above problems, and when the breaker is restored, the battery is always removed from the main body, and the state where the cutting blade starts to move at the same time when the breaker is restored is eliminated. The present invention aims to provide a battery-operated blade tool that can safely continue work.

[0006]

According to the present invention, in order to achieve the above object, a battery mounting portion 2 provided in a tool body 1 is provided.
In addition, a battery 3 is detachably attached to the tool body 1, a breaker 5 that operates when the motor 4 is overloaded is provided in the tool body 1, and a return operation portion 6 that returns the breaker 5 is provided in the battery mounting portion 2. .

[0007]

When the breaker 5 operates due to an overload on the motor 4, the voltage of the battery 3 is not transmitted to the motor 4, so that the motor 4 does not operate even if the switch is turned on. To restore the battery, the battery 3 is removed from the battery mounting portion 2 and the return operating portion 6 in the battery mounting portion 2 is operated, so that the cutting blade does not operate at the same time when the breaker 5 is returned. After returning the breaker 5 to the battery mounting section 2 again
Attach the battery 3 to and return to work.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The battery-operated blade tool shown is a circular saw,
The battery-type cutting tool is not limited to this, and may be a grinder, a jigsaw, a reciprocating saw, or the like. Hereinafter, the case where the battery type tool is a circular saw will be described in detail. As shown in FIGS. 2 and 3, a circular saw as a battery-powered blade tool is mainly constituted by a saw blade 7 rotatably attached to the tool body 1, and the saw blade 7 is housed in the tool body 1. It is adapted to be rotationally driven by a motor 4 as a drive source arranged.

As shown in FIG. 1, a grip portion 8 is provided at the rear portion of the tool body 1, and a battery 3 is detachably attached to a battery mounting portion 2 provided at the rear portion of the grip portion 8. It has become. A reinforcing piece 9 is provided below the grip portion 8 so that the reinforcing piece 9 makes the grip portion 8 thin and easy to grip without reducing the strength of the tool body 1. A motor 4 is arranged on one side of the center of the tool body 1, and a fixed cover 10 is attached to the other side of the tool body. The fixed cover 10 is used to rotate the saw blade 7 using the motor 4 as a drive source. It covers almost the upper half. A base 11 is attached to the lower surface of the tool body 1, and a substantially lower half of the saw blade 7 projects downward from a long groove of the base 11. A substantially lower half of the saw blade 7 protruding downward from the long groove of the base 11 is covered with a movable cover 12. The base 11 is rotatably mounted on the front end of the tool body 1 via a rotary shaft 13, and can be rotated about the front end rotatably mounted on the rotary shaft 13.

A breaker 5 that operates when the motor 4 is overloaded is housed in the rear part of the tool body 1, and a breaker 5 has a reset button 6a as a reset operation part 6 for resetting the breaker 5. It is provided. The return button 6a is provided in the opening 1 provided on the inner wall of the battery mounting portion 2.
The button 6a is located at the back of the battery 4, and the return button 6a is operated by inserting a finger from the opening 14 with the battery 3 removed from the battery mounting portion 2. That is, battery 3
In the state where the breaker 5 is mounted inside the battery mounting part 2 and is mounted on the tool body 1, the return operation part 6 of the breaker 5 is the battery mounting part 2.
It is hidden and cannot be touched. Also, dust and the like generated during the work are covered by the battery 3. Reference numeral 15 is a switch, and 16 is a switch lock lever for locking the switch operation.

As shown in FIG. 4, the voltage supplied from the battery 3 is transmitted to the motor 4 via the switch 15 and forms an electric circuit via the breaker 5, and in this case, it is constructed in series. Therefore, if some part is turned off, the circuit is turned off. Grip part 8
In the battery mounting portion 2 formed at the rear of the battery mounting portion 2, there is provided an L-shaped receiving surface 17 to which the outer surface of the battery 3 configured by the bottom wall 17a and the side wall 17b is abutted. The battery guide metal fitting 1 for regulating the battery 3 in the upper and horizontal directions is provided on the upper portion.
8 are provided. One end of the battery guide metal fitting 18 is connected and fixed to the rear end of the grip portion 8 so as not to move, and a battery fixing metal fitting 19 for preventing the battery 3 from escaping backward is attached to the other end of the spring pin. It is rotatably attached by a shaft 20.

By rotating the battery fixing bracket 19 axially attached to one end of the battery guide bracket 18, the battery mounting portion 2
The battery 3 can be taken in and out of the
As shown in FIG. 5, the tip of the battery fixing member 19 has a narrow width and is bent in an L shape, and a long hole 21 is formed in the bent portion. On the other hand, in the projecting wall 22 having a battery receiving surface provided at the rear end of the tool body 1, there is arranged a releasing button 23 which is movable within a predetermined range in a direction orthogonal to the inserting direction of the battery 3. The release button 23 is biased outward by a spring member 24 such as a coil spring. One end of the release button 23 partially projects to the outside of the tool body 1 so that it can be pressed from the outside of the tool body 1 with a finger, and the other end is provided with a mounting shaft 25 for mounting the spring member 24. ing. A hook 26 is provided at the center of the release button 23.
Is a long hole 2 formed at the tip of the battery fixing bracket 19 described above.
1 is engaged. Therefore, when attaching the battery 3 to the tool body 1, simply inserting the battery 3 and then pushing the battery fixing bracket 19 in the inserting direction of the battery 3 causes the long hole 21 of the battery fixing bracket 19 to move to the tip of the hook 26 of the release button 23. After moving along the taper 26a to bias the spring member 24, the spring fixing member 24 is engaged with the hook 26 to fix the battery fixing member 19. Button 23 for releasing when removing the battery 3
By pushing the tool inward from the outside of the tool body 1, the hook 26 moves inward with the movement of the release button 23, whereby the hook 26 disengages from the long hole 21 of the battery fixing bracket 19 and fixes the battery. It is possible to open the metal fitting 19 and remove the battery 3 from the battery mounting portion 2.

On the upper part of the battery 3 mounted on the battery mounting part 2, the projecting part 3 is inserted and connected to the tool body 1 and the charger.
a is provided so as to project toward the outer side, and the battery terminal 27 is output to the end surface of the projecting portion 3a. A switch 15 mounted in the grip portion 8 is provided on both terminals of the battery terminal 27.
The plate-like terminal 28, which is screwed to, is in pressure contact. As a result, when the switch 15 is turned on, the voltage of the battery 3 is supplied to the motor 4 via the lead wire 29, and the gearbox 30
The deceleration block housed inside is rotationally driven to transmit rotational power from the blade mounting plate mounted on the output shaft 31 to the saw blade 7. Here, the battery 3 mounted in the battery mounting portion 2 has a receiving surface (bottom wall 17a) of the projecting wall 22 that is substantially parallel to the grip portion 8 and the battery 3
The lower surface of the battery 3 is received, and since the protruding portion 3a provided with the battery terminal 27 is inserted into the grip portion 8, the mounting / dismounting direction of the battery 3 is parallel to the grip portion 8. The lower surface of the battery 3 is guided by the receiving surface (bottom wall 17a) of the protruding wall 22 that is substantially parallel to the grip portion 8, and even if the battery 3 is large and heavy, it can be easily attached to and detached from the battery mounting portion 2. In addition, since the battery 3 is securely fixed during the work, it is possible to use the battery 3 safely without danger of dropping. Further, since the protruding wall 22 that guides the lower surface of the battery 3 receives the weight of the battery 3, the holding strength of the battery 3 is high.

The circular saw as the battery-powered tool is a saw blade 7
It is equipped with a cutting depth adjusting means 40 for adjusting the cutting depth in the cutting, and the cutting depth adjusting means 40 is usually used when cutting a thin plate or when it is not desired to cut an object under the material to be cut. The tool main body 1 with respect to the base 11
A saw shaft 7 and a rotary shaft 1 provided at the front end of the base 11.
3 is rotated around the center to adjust the cutting depth of the saw blade 7 into the material.

The cutting depth adjusting means 40 is composed of a base 11 which can be turned around a shaft attachment portion at the front end as a fulcrum, and a position changing means 41 which positions and fixes the base 11 after turning it. The saw blade 7 protruding downward from the base 11 is adjusted by moving the rear end of the base 11 up and down with the front end of the base 11 as a fulcrum.
With this, the cutting depth by the saw blade 7 is adjusted.

At the rear end of the base 11, a depth adjusting plate 42 which fits the semi-peripheral circular shape of the fixed cover 10 is fixed by a rivet, and the depth adjusting plate 42 is provided at the center of the plane for fixing the depth. A long groove is provided along substantially the entire circumference so that the square screw 43 can pass. Further, the depth adjusting plate 42 is formed of thin leaf spring steel, and even if the shape is changed when the depth is adjusted, if it is returned to the original position, the elasticity of the leaf spring restores the initial shape. ing. The square screw 43 for depth adjustment has a quadrangular root portion of the head, and the fixed cover 10 has a rear end portion formed with a square hole that engages with the square of the square screw 43. I'm turning off 43. The screw portion of the square screw 43 is composed of a multiple thread, and the square screw 43 is the fixed cover 1.
It is inserted from the inside of 0. The square screw 43 is inserted through the fixed cover 10, the depth adjusting plate 42, the flat washer 44, and the spring washer 45, and is fixed by the fixed lever 46. A multi-threaded female screw corresponding to the screw of the square screw 43 is formed on the fixed lever 46, and the fixed lever 46 and the fixed cover 10 rotate the fixed lever 46 by about 90 ° so that the depth adjusting plate 4 can be formed.
The depth adjusting plate 42 can be fixed by sandwiching 2 and the position changing means 41 is constituted by this. Then, the fixing lever 46 is loosened to move the depth adjusting plate 42 downward along the outer surface of the fixed cover 10, and after the position adjustment, the fixing lever 46 is rotated to fix the depth adjusting plate 42, thereby fixing the depth adjusting plate 42. The rear end is lowered, whereby the protruding size of the saw blade 7 protruding downward from the base 11 is reduced, and the cutting depth of the cut object by the saw blade 7 can be reduced. In addition, the intermediate portion of the base 11 is the saw blade 7
The base 11 so as to be close to the output shaft 31 holding
By moving the saw blade 7, the protruding dimension of the saw blade 7 protruding below the base 11 can be increased, and the cutting depth of the cut object cut by the saw blade 7 can be increased.

FIGS. 6 and 7 show another embodiment of the position changing means 41, in which the position changing means 41 is fixed after the position changing by a cam system. At the rear end of the fixed cover 10, walls 47 project from both sides so as to surround the depth adjusting plate 42, and a through hole into which a pin 49 serving as a fulcrum of rotation of the cam lever 48 can be press-fitted is formed in this wall 47. The outer peripheral shape of the cam lever 48 for pressure contact fixing is eccentric with respect to the center hole, and when the cam lever 48 is raised vertically, the outer peripheral position approaches the fixed cover 10 side, and the depth adjusting plate 42 is connected to the cam lever 48. Fixed cover 1
It can be fixed by sandwiching it between 0's. Further, when the cam lever 48 is tilted horizontally, the outer peripheral position is separated from the fixed cover 10, and the depth adjusting plate 42
Is in a free state, and the base 11 can be rotated by slidingly moving the depth adjusting plate 42.

In order to cut an object to be cut such as a plate material, the base 11 is placed on the object to be cut and the switch 15 is operated to move the saw blade 7 in the direction shown by the arrow in FIG. By rotating the saw blade 7 and advancing the tool body 1 together with the rotation of the saw blade 7, the object to be cut is cut. When the motor 4 is overloaded during the cutting operation, the breaker 5 operates to prevent the battery voltage from being transmitted to the motor 4, thereby preventing the motor 4 and the battery 3 from burning.
Next, when continuing the cutting work, the cutting work is continued by operating the return button 6a which is the return operation unit 6 of the breaker 5 to return the breaker 5, but the operation of the return button 6a The battery 3 is removed from the battery mounting part 2 and a finger is put in the battery mounting part 2, and a finger is put in the opening 14 provided in the inner wall of the battery mounting part 2 and the reset button 6a is pushed to restore the breaker 5. . Here, even if the breaker 5 is restored, the motor 4 is not driven because the battery 3 has been removed from the battery mounting portion 2, and the saw blade 7 is turned on at the same time when the breaker 5 is re-closed. Is designed so that it will not rotate. Subsequently, the battery 3 is attached to the battery mounting portion 2 and the cutting operation is restarted.

[0019]

As described above, according to the present invention, the battery mounting portion provided in the tool body is detachably provided with the battery, and the tool body is provided with the breaker which operates when the motor is overloaded. Since the breaker has a reset operation part for resetting the breaker, the battery must be removed from the tool body when the breaker in the battery mounting part is reset. It is possible to safely continue the cutting work performed by returning the breaker without being driven.

[Brief description of drawings]

1A and 1B show an embodiment of the present invention, in which FIG. 1A is an overall cross-sectional view, and FIG. 1B is a partial plan view of a battery storage portion.

FIG. 2 is a partially cutaway front view of the same.

FIG. 3 is a side view of the above.

FIG. 4 is a circuit diagram of the above.

5A and 5B are partial cross-sectional views showing a locked state of a battery fixing bracket.

6A and 6B show another embodiment of the cutting depth adjusting means, wherein FIG. 6A is a partially cutaway front view, and FIG. 6B is a side view.

FIG. 7 is a partially cutaway front view showing an operating state of the above cutting depth adjusting means.

[Explanation of symbols]

 1 Tool body 2 Battery mounting part 3 Battery 4 Motor 5 Breaker 6 Return operation part

Claims (1)

[Claims] 1. A return operation section for removably operating the breaker in the battery mounting section, wherein a battery is detachably attached to a battery mounting section provided in the tool main body, a breaker that operates when the motor is overloaded is provided in the tool main body. A battery-operated blade tool, comprising: