JP3427431B2 - Battery-powered tool - Google Patents

Description

Description: 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, a reciprocating saw, etc. having a detachable battery. 2. Description of the Related Art In recent years, there are few battery-powered tool tools having a built-in breaker as an overload protection device, and if the lock state is continued, there is a high possibility that a motor or a battery pack will be damaged. ing. Drills and hammer drills as drilling tools respond mechanically by operating the overload prevention clutch, but cutting tools such as circular saws often require rotation speed and torque, Clutch setting is difficult. [0003] Recently, high-voltage batteries have appeared with the advancement of battery performance (small size, high capacity) and development of charging technology for chargers. For this reason, when a high-voltage battery is locked, it often burns in a shorter time than a conventional battery, and a tool with a high-performance battery requires a lock protection device or the like on the main body. Some AC-type tools have a built-in breaker for lock protection, but the main switch trigger can be pulled in even when the breaker operates, and when the breaker is returned, the saw blade may suddenly start moving. There is
The danger is high. Particularly, there is a problem that the danger is further increased in a tool having a switch lock function that can lock the switch in an ON state without continuously holding the switch on the main body side. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problem. When the breaker is returned, the battery is always removed from the main body, and the state in which the cutting blade starts moving at the same time when the breaker is returned is eliminated. Another object of the present invention is to provide a battery-powered tool that can safely continue work. According to the present invention, in order to achieve the above object, a battery mounting portion 2 provided on a tool body 1 is provided.
A battery 3 in the tool body 1, a breaker 5 that operates when the motor 4 is overloaded, and a return operation unit that returns the breaker 5 to a position hidden by the battery 3 in the battery mounting unit 2. 6 is provided. When the motor 4 is overloaded and the breaker 5 is operated, the voltage of the battery 3 is not transmitted to the motor 4, so that even if the switch is turned on, the motor 4 does not operate. In order to return, the battery 3 is detached from the battery mounting section 2 and the return operation section 6 in the battery mounting section 2 is operated, so that the cutting blade does not operate at the same time when the breaker 5 is returned. After the breaker 5 is returned, the battery
Then, attach the battery 3 and return to the work. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The illustrated battery-powered cutting tool is a circular saw,
The present invention is not limited to this, and the battery-powered tool may be a grinder, a jigsaw, a reciprocating saw, or the like. Hereinafter, a case where a circular saw is used as the battery-type blade tool will be described in detail. As shown in FIGS. 2 and 3, a circular saw as a battery-type blade tool is configured such that a saw blade 7 is rotatably attached to a tool body 1 and the saw blade 7 is housed in the tool body 1. It is configured to be rotationally driven by a motor 4 as a disposed driving source. As shown in FIG. 1, a grip portion 8 is provided at a rear portion of the tool body 1, and a battery 3 is detachably attached to a battery mounting portion 2 provided at a rear portion of the grip portion 8. It has become. A reinforcing piece 9 is provided below the grip portion 8, and the grip portion 8 is made thinner without lowering the strength of the tool body 1 by the reinforcing piece 9 so that it can be easily gripped. 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 1. The fixed cover 10 has a saw blade 7 that rotates with 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 projecting downward from the long groove of the base 11 is covered with a movable cover 12. The base 11 is pivotally mounted on the front end of the tool body 1 via a rotation shaft 13, and can be rotated around the front end pivotally mounted on the rotation shaft 13. A breaker 5 that operates when the motor 4 is overloaded is housed and disposed in the rear portion of the tool body 1. The breaker 5 has a return button 6 a as a return operation unit 6 for returning the breaker 5. Is provided. The return button 6a is connected to the opening 1 provided on the inner wall of the battery mounting section 2.
The operation of the return button 6a is performed by putting a finger through the opening 14 with the battery 3 removed from the battery mounting section 2. That is, battery 3
Is mounted in the battery mounting section 2 and mounted on the tool body 1, the return operation section 6 of the breaker 5 is mounted on the battery mounting section 2.
It is hidden by the battery 3 mounted inside so that it cannot be touched. Further, dust and the like generated during the operation are covered by the battery 3. Reference numeral 15 denotes a switch, and reference numeral 16 denotes a switch lock lever for locking a 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, they are configured in series. Therefore, if any part is turned off, the circuit is turned off. Grip part 8
An L-shaped receiving surface 17 is provided in the battery mounting portion 2 formed at the rear of the battery mounting portion 2, the outer surface of the battery 3 being constituted by a bottom wall 17 a and a side wall 17 b. On the upper part, a battery guide fitting 1 for regulating the battery 3 in the horizontal direction.
8 are provided. One end of the battery guide fitting 18 is connected and fixed to the rear end of the grip portion 8 so as not to move, and the other end of the battery guide fitting 18 is provided with a battery fixing fitting 19 for preventing the battery 3 from escaping backward. 20 is rotatably mounted on the shaft. The battery mounting portion 2 is rotated by rotating a battery fixing bracket 19 attached to one end of the battery guide bracket 18.
It is possible to put the battery 3 in and out of the
As shown in FIG. 5, the distal end of the battery fixing bracket 19 has a small width and is bent in an L-shape, and an elongated hole 21 is formed in the bent portion. On the other hand, a release button 23 that is movable within a predetermined range in a direction orthogonal to the direction in which the battery 3 is inserted is provided in a protruding wall 22 having a battery receiving surface provided at the rear end of the tool body 1. The release button 23 is urged outward by a spring member 24 such as a coil spring. One end of the release button 23 projects partly outside the tool body 1 so that it can be pressed with a finger from outside the tool body 1, and an attachment shaft 25 for attaching the spring member 24 is formed at the other end. ing. At the center of the release button 23, a hook 26 is provided.
Is a long hole 2 formed at the tip of the battery fixing bracket 19 described above.
1. Therefore, when attaching the battery 3 to the tool main body 1, only by pushing the battery fixing bracket 19 in the insertion direction of the battery 3 after inserting the battery 3, the long hole 21 of the battery fixing bracket 19 is connected to the tip of the hook 26 of the release button 23. After moving along the taper 26a to urge the spring member 24, the battery fixing metal 19 is fixed by engaging with the hook 26. Release button 23 to remove battery 3
Is pressed 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 is disengaged from the long hole 21 of the battery fixing bracket 19 and the battery is fixed. By opening the metal fitting 19, the battery 3 can be removed from the battery mounting section 2. On the upper part of the battery 3 mounted on the battery mounting part 2, a projecting part 3 inserted and connected to the tool body 1 and the charger.
a is protruded outward, and the battery terminal 27 outputs to the end face of the protruding portion 3a. Both terminals of the battery terminal 27 are connected to a switch 15 mounted in the grip portion 8.
A plate-like terminal 28 fixed to the screw is pressed. 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 gear box 30 is turned on.
The deceleration block housed inside is rotationally driven, and rotational power is transmitted to the saw blade 7 from a blade mounting plate mounted on the output shaft 31. Here, the battery 3 mounted in the battery mounting portion 2 is mounted on the receiving surface (bottom wall 17a) of the protruding wall 22 substantially parallel to the grip portion 8.
The lower surface of the battery 3 can be received. Also, the battery 3 has a protrusion 3a provided with a battery terminal 27 inserted into the grip portion 8, so that the mounting / dismounting direction 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 substantially parallel to the grip portion 8, so that the battery 3 can be easily attached to and detached from the battery mounting portion 2 even if the battery 3 becomes large and heavy. Since the battery 3 is securely fixed during operation, the battery 3 can be used safely without danger of falling. Further, since the weight of the battery 3 is received by the protruding wall 22 that guides the lower surface of the battery 3, the holding strength of the battery 3 is high. The circular saw as this battery-powered cutting tool is a saw blade 7
Cutting depth adjusting means 40 for adjusting the cutting depth at the cutting section. The cutting depth adjusting means 40 is generally used when cutting a thin plate or when it is not desired to cut an object below the material to be cut. The tool body 1 with respect to the base 11
And a rotating shaft 1 provided at the front end of a base 11
The cutting depth of the saw blade 7 is adjusted by rotating the cutting blade 3 upward. The cutting depth adjusting means 40 is composed of a base 11 which is rotatable about a shaft attachment portion at a front end as a fulcrum, and a position changing means 41 for positioning and fixing the base 11 after rotating. And adjusting the protrusion dimension of the saw blade 7 projecting downward from the base 11 by moving the rear end of the base 11 up and down with the front end of the base 11 as a fulcrum,
Thereby, the cutting depth by the saw blade 7 is adjusted. At the rear end of the base 11, a depth adjusting plate 42 conforming to the semicircular outer peripheral shape of the fixed cover 10 is fixed by rivets, and at the center of the plane of the depth adjusting plate 42, a depth fixing plate 42 is fixed. A long groove is provided along substantially the entire circumference so that the square screw 43 passes. Further, the depth adjusting plate 42 is formed of a thin leaf spring steel, and even if the shape changes when the depth is adjusted, if it returns to the original position, it returns to the original shape by the elasticity of the leaf spring. ing. The square screw 43 for adjusting the depth has a square shape at the base of the head, and a square hole for engaging with the square shape of the square screw 43 at the rear end of the fixed cover 10. 43 is stopped. The screw portion of the square screw 43 is formed of a multi-thread screw, and the square screw 43 is
It is inserted from inside 0. The square screw 43 passes through the fixed cover 10, the depth adjustment plate 42, the flat washer 44, and the spring washer 45 and is fixed by the fixing lever 46. The fixing lever 46 is formed with a multi-thread female screw corresponding to the screw of the square screw 43. By rotating the fixing lever 46 by about 90 °, the depth adjusting plate 4
2, the depth adjusting plate 42 can be fixed, thereby constituting the position changing means 41. Then, the fixing lever 46 is loosened to move the depth adjusting plate 42 down along the outer surface of the fixing cover 10, and after the position adjustment, the fixing lever 46 is rotated to fix the depth adjusting plate 42, whereby the base 11 is fixed. The rear end descends, whereby the protrusion dimension of the saw blade 7 protruding below the base 11 is reduced, and the cutting depth of the cut by the saw blade 7 can be reduced. The middle part of the base 11 is
Base 11 so as to be close to output shaft 31 holding
By moving the saw blade 7, the projecting 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 fixing after position change is performed 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 rotation fulcrum of the cam lever 48 can be press-fitted is formed in the wall 47. The outer peripheral shape for pressing and fixing the cam lever 48 is eccentric with respect to the center hole, and when the cam lever 48 is raised vertically, the outer peripheral position is shifted toward the fixed cover 10 side, and the depth adjusting plate 42 is connected to the cam lever 48. Fixed cover 1
It can be sandwiched and fixed between 0. When the cam lever 48 is tilted horizontally, the outer peripheral position is separated from the fixed cover 10 and the depth adjustment plate 42
Is in a free state so that the base 11 can be rotated by sliding the depth adjustment plate 42. When cutting a workpiece such as a plate material, the base 11 is placed on the workpiece and the switch 15 is operated to move the saw blade 7 in the direction indicated by the arrow in FIG. The object to be cut is cut by rotating the tool body 1 with the rotation of the saw blade 7. If 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 being damaged.
Next, when the cutting operation is continued, the cutting operation is continued by operating the return button 6a which is the return operation section 6 of the breaker 5 to return the breaker 5, but the operation of the return button 6a is not performed. The battery 3 is removed from the battery mounting portion 2 and a finger is inserted into the battery mounting portion 2. A finger is inserted into an opening 14 provided on the inner wall of the battery mounting portion 2, and a return button 6 a is pressed to return the breaker 5. . Here, even if the breaker 5 is returned, the motor 4 does not drive because the battery 3 has been removed from the battery mounting part 2 and the saw blade 7 is simultaneously turned on when the breaker 5 is turned on again. There is no such thing as rotating. Subsequently, the battery 3 is attached to the battery mounting section 2 and the cutting operation is restarted. According to the present invention, as described above, the battery is provided in the battery mounting portion provided on the tool body in a detachable manner, and the breaker which operates when the motor is overloaded is provided in the tool body. is provided with the return operation unit for restoring operation of the breaker at a position where it is concealed by the battery mounting portion, no longer shall detached from the tool body always battery when returning the breaker in the battery holder, return operation The motor is not suddenly driven at the same time when the breaker is returned by the operation of the unit, and the cutting operation performed by returning the breaker can be safely performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 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 housing. FIG. 2 is a partially broken front view of the same. FIG. 3 is a side view of the same. FIG. 4 is a circuit diagram of the same. FIGS. 5A and 5B are partial cross-sectional views showing a locked state of a battery fixing bracket. FIGS. 6A and 6B show another embodiment of the cutting depth adjusting means, in which 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 operation state of the cutting depth adjusting unit according to the first embodiment. [Description of Signs] 1 Tool body 2 Battery mounting section 3 Battery 4 Motor 5 Breaker 6 Return operation section

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B25F 5/00 H02H 7/00

Claims (1)

(57) [Claims] [Claim 1] A battery mounting portion provided on a tool main body is provided with a detachable battery, a breaker that operates when the motor is overloaded is provided in the tool main body, and the battery mounting portion is provided with a battery. Hidden by the battery
A battery-operated cutting tool comprising a return operation section for returning the breaker to a position where the breaker is operated.