JP2001293672A - Rechargeable electric tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To certainly remove a battery pack at replacement of a saw tooth. SOLUTION: A shaft lock 27 engageable with a chamfered part 8a of an output shaft is slidably stored in a blade case 4, being energized to a backwardly lock release position. A joint 35 is provided on the extension of the shaft lock 27 in the pressing direction slidably, energized to the most backing position. The joint 35, at the most backing position, is close to the upper surface of the battery pack 24 with front end 38 mounted to a handle 21. Even if the shaft lock 27 is pressed in this state, the joint 35 abutting to the upper surface of the battery pack 24 regulates progression to a lock position where the shaft lock 27 engages with the chamfered part 8a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rechargeable power tool such as a circular saw which is mounted on a housing using a battery pack as a power source.

[0002]

2. Description of the Related Art For example, a circular saw machine comprises a base and a main body in which a disc-shaped saw blade is provided orthogonal to a motor housing for accommodating a motor, and a handle housing is connected to a side of the motor housing. The battery pack is detachably mounted on the end of the handle housing. In such a circular saw machine, when replacing the saw blade or the like, set the motor housing down on a work table or the like, and tighten or tighten a bolt for fixing the center of the saw blade using a hexagon wrench or the like. I was working to release it. Further, a lock member capable of locking the rotation of a spindle to which the output shaft or the saw blade of the motor is directly fixed at the lock position where the main body is pushed into the main body is provided to be biased to a lock release position protruding from the main body. By pushing the lock member into the lock position to lock the rotation of the output shaft or the spindle, the bolt can be tightened or released.

[0003]

In recent years, the use of rechargeable power tools has become remarkable, and with this, users have demanded an increase in the amount of work per charge. As a solution to this, higher capacity batteries have been developed, but current technology still has limitations. for that reason,
The battery pack itself tends to be larger (higher voltage), and the weight of the battery pack itself is 1.5 kg in the case of a 24 V battery pack. In the above-mentioned circular saw using such a battery pack, in the work of attaching and detaching the saw blade, since the heavy battery pack is located on the side of the main body, the sitting of the circular saw is poor, and the work is difficult. It is desirable to remove the battery pack in advance because it becomes difficult. Therefore, utility model registration No. 254108
As disclosed in Japanese Patent Publication No. 4, a special tool such as a hexagon wrench
If the battery pack is mounted on the housing so as to be positioned in the removal direction, and the dedicated tool cannot be removed without removing the battery pack from the housing, the procedure is such that the battery pack is removed first when the dedicated tool is used. However, since the battery pack can be detached independently even when the dedicated tool is detached from the housing, the battery pack is not always reliably removed when the saw blade is attached or detached.

Accordingly, an object of the present invention is to provide a rechargeable power tool in which a battery pack can be reliably removed when a saw blade is attached or detached, regardless of the presence or absence of a special tool.

[0005]

According to one aspect of the present invention, a battery pack is removably mounted in a housing containing a motor, while the motor is mounted in the housing. A lock member slidable between a lock position for locking the rotation of any one of an output shaft or a spindle to which torque is transmitted from the output shaft and a lock release position for releasing the lock is moved to the lock release position. A rechargeable power tool provided in a biased manner, wherein the lock member is interlocked with sliding to the lock position, and abuts on the battery pack before reaching the lock position to slide the lock member. The interlocking body which can be prevented is provided integrally with or separately from the lock member.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory cross-sectional view of a rechargeable circular saw (hereinafter referred to as a “circular saw”), FIG.
FIG. 3 is an explanatory plan view of the circular saw 1. The circular saw 1 includes a square base 2 and a main body 3 arranged on the base 2. In the main body 3, reference numeral 4 denotes a blade case, and a motor 7 is mounted on a rear cylindrical portion 5 (the right side in FIG. 1 is described as a rear).
Is connected to the motor housing 6,
Output shaft 8 protrudes into the cylindrical portion 5 and the ball bearing 9
It is pivoted on. In the cylindrical portion 5, the spindle 12 is supported by the ball bearings 10 and 11 in parallel with the output shaft 8, and the gear 13 integral with the spindle 12 meshes with the output shaft 8, and the rotation of the output shaft 8 is controlled by the spindle. 12 can be transmitted. Further, at the tip of the spindle 12,
A disc-shaped saw blade 15 has an inner flange 16 and an outer flange 17 fitted to the chamfered portion 14 of the spindle 12.
By screwing a hexagon socket head cap screw 18 screwed into the spindle 12 from the front of the outer flange 17, the saw blade 15 is tightened integrally with the spindle 12.

As shown in FIGS. 2 and 3, the blade case 4 has one end (the left side in FIGS. 2 and 3) in the longitudinal direction of the base 2 rotatably connected to the base 2 and the other end. Is slidably connected along an arc-shaped guide member 19 erected on the base 2, and the other end is tightened by a lever 20 at an arbitrary position of the guide member 19, The protruding amount (cutting amount) of the saw blade 15 from below the base 2 can be adjusted. On the other hand, reference numeral 21 denotes a handle provided continuously above the motor housing 6 in parallel with the saw blade 15. At the rear end of the handle 21, a mounting portion 22 of a battery pack 24 containing a plurality of storage batteries is opened. A pair of parallel guide rails 23 protrude from left and right of the portion 22. By fitting and sliding a pair of slide rails 25 formed on both sides of the upper surface of the battery pack 24 between the guide rails 23, the battery pack 24 is mounted on the mounting portion 22 and the mounting portion 22 is mounted. A positive / negative terminal 26 (shown in FIG. 4) provided on the battery pack 22 is electrically connected to a positive / negative charging terminal (not shown) on the battery pack 24 side. Reference numeral 42 denotes a switch lever provided above the handle 21.

In the cylindrical portion 5 of the blade case 4, behind a ball bearing 9 that supports the output shaft 8, a band-shaped shaft lock 27 as a lock member extends along the longitudinal direction of the base 2. Is slidably housed. The shaft lock 27 has a ring portion 28 through which the output shaft 8 penetrates in the center, and a stopper piece 29 bent above the ring portion 28 is attached to the cylindrical portion 5 in parallel with the sliding direction of the shaft lock 27. In the recessed portion 33 to be recessed and supported by the coil spring 34 accommodated in the recessed portion 33, the supporting side of the blade case 4 (on the left side in FIGS. 2 and 3, 3 will be referred to as a rear side and a right side as a front side.) In the unlocked position shown in FIGS. 2 and 3 where the stopper piece 29 abuts against the rear inner surface of the concave portion 33 and stops, the output shaft 8 is positioned at the center of the ring portion 28 and the pushing portion 31 at the rear end is formed into a cylindrical shape. It protrudes from the side of the part 5. On the other hand, on the inner periphery of the ring portion 28, a fitting concave portion 30 is formed which can be fitted to the chamfered portion 8a having a two-plane width formed on the output shaft 8, and the shaft lock 27 is biased by the coil spring 34. By pushing the fitting concave portion 30 into the chamfered portion 8a by pushing it into the cylindrical portion 5, the rotation of the output shaft 8 can be locked (lock position).

Further, in the handle 21, on the extension of the contact portion 32 extending in the pushing direction of the shaft lock 27, a band-shaped joint 35 as an interlocking body extends along the longitudinal direction of the base 2. Is slidably housed.
This joint 35 also has a stopper piece 3 extending upward.
6 is located in a recess 39 formed in the handle 21 in parallel with the joint 35 and is urged rearward by a coil spring 40 housed in the recess 39 to form a rearward bent portion 37 formed obliquely upward. 2 and 3 at which the front end 38 comes close to the upper surface of the battery pack 24 attached to the handle 21 and the bent portion 37 at the rear end, In front of the contact portion 32 of the shaft lock 27, the advance of the shaft lock 27 to the locked position can be restricted.

In the circular saw 1 constructed as described above, when removing the saw blade 15 for replacement or the like, the circular saw 1 is set on a workbench or the like with the motor housing 6 down. Loosen the hexagon socket head cap screw 18 with a hexagon wrench key. At this time, when the shaft lock 27 is pushed in so that the spindle 12 does not rotate, the abutting portion 32 of the shaft lock 27 that has been advanced contacts the bent portion 37 of the joint 35 to try to advance the joint 35. When the battery pack 24 is mounted on the mounting portion 22 of the handle 21, the front end 38 of the joint 35 immediately comes into contact with the upper surface of the battery pack 24 and stops, and the forward movement of the shaft lock 27 is restricted. 27, the fitting recess 30 is connected to the output shaft 8 as shown by a two-dot chain line in FIG.
Does not reach the lock position where it fits into the chamfered portion 8a of the output shaft 8
And the rotation of the spindle 12 cannot be locked. Therefore,
When the battery pack 24 is removed from the mounting portion 22 along the guide rails 23, 23, the front of the joint 35 is released. 4 and 5, the fitting recess 30 can be fitted to the chamfered portion 8a of the output shaft 8. Accordingly, the rotation of the output shaft 8 is locked, and the rotation of the spindle 12 meshing with the output shaft 8 is also locked, so that the hexagonal bolt 18 can be rotated. This is the same when the saw blade 15 is mounted on the spindle 12.

As described above, according to the above-described embodiment, the shaft lock 27 is used in conjunction with the slide to the lock position by using the shaft lock 27 used when the saw blade 15 is attached and detached. By providing the joint 35 that can prevent the shaft lock 27 from sliding in contact with the battery pack 24, the shaft lock 27 cannot be pushed (the spindle 12 is locked) while the battery pack 24 is mounted. Then, the procedure of removing the battery pack 24, pushing in the shaft lock 27 to lock the spindle 12, and attaching / detaching the saw blade 15 is established. In particular, this procedure uses the circular saw 1
This is established irrespective of the presence or absence of a special tool such as a hexagon wrench attached to itself, so that when the saw blade 15 is attached or detached, the battery pack 24 is securely removed. Therefore, the circular saw 1 is always set in a stable state and the saw blade 1 is set.
5 can be performed with good workability. or,
Even if the switch lever 42 is operated by mistake, there is no possibility that the saw blade 15 rotates.

In the above-described embodiment, a space is provided between the shaft lock 27 and the joint 35, and the joint 35 is interlocked after the shaft lock 27 is slightly slid. However, such an operation delay is eliminated. hand,
A structure in which the joints 35 are simultaneously operated may be employed.
An interlocking body such as the joint 35 is a shaft lock 27.
And the integrated interlocking part may be shortened depending on the distance from the battery pack 24. Further, the shape of the lock member is not limited to the shape like the shaft lock 27, and a shape change such as providing a fitting concave portion with the output shaft on the side is possible.

On the other hand, in the above-described embodiment, the lock member and the interlocking member are arranged in a straight line so as to make contact with the battery pack located on the extension thereof. For example, the battery pack is located next to the lock member. Even in the case of being mounted, by disposing the one end of the interlocking body pivotally supported at the center so that one end thereof is in contact with the lock member, and the other end thereof is in contact with the battery pack, the slide member of the lock member slides. A configuration is also conceivable in which the interlocking member is swung to make contact with the battery pack. In the above embodiment, the output shaft is locked. However, depending on the mounting position of the battery pack, the spindle may be locked. In addition, the mounting structure of the battery pack is not limited to the slide mounting as in the above-described embodiment, and may be a structure that can be inserted into and removed from the mounting portion. The present invention is not limited to this and can be applied to cutters and grinders.

[0014]

According to the first aspect of the present invention, the lock member that locks the rotation of the output shaft or the spindle is interlocked with the slide to the lock position, and contacts the battery pack before reaching the lock position. By providing an interlocking body that can come into contact with and prevent the lock member from sliding, it is integrated with or separate from the lock member, so that the lock member cannot be pushed in with the battery pack attached, so the battery pack is removed Then, a procedure is established in which the locking member is pushed in to lock the output shaft or the spindle. In particular, since this procedure is established regardless of the presence or absence of a special tool such as a hexagon wrench attached to the housing, the battery pack can be reliably removed when replacing the saw blade of the circular saw.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a circular saw machine.

FIG. 2 is an explanatory rear view of the circular saw machine.

FIG. 3 is an explanatory plan view of the circular saw machine.

FIG. 4 is an explanatory rear view of the circular saw machine (in a state where a shaft lock is pushed in).

FIG. 5 is an explanatory plan view of the circular saw machine (in a state where a shaft lock is pushed in).

[Explanation of symbols]

1. Circular saw machine, 2. Base, 3. Body, 4. Blade case, 5. Cylindrical part, 6. Motor housing,
7 motor, 8 output shaft, 12 spindle, 1
5. Saw blade, 18 hexagon socket head bolt, 21 handle, 24 battery pack, 27 shaft lock, 30 fitting recess, 35 joint.

Claims (1)

[Claims] 1. A battery pack is removably mounted in a housing containing a motor, and a rotation of one of an output shaft of the motor and a spindle to which torque is transmitted from the output shaft is locked in the housing. A rechargeable power tool provided with a lock member slidable between a lock position to be locked and a lock release position to release the lock, and the lock member being urged to the lock release position. An interlocking body which is linked to the slide to the lock position and which can contact the battery pack before reaching the lock position to prevent the lock member from sliding is provided integrally with or separately from the lock member. Characteristic rechargeable power tool.