JP3636963B2 - Rechargeable electric tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rechargeable electric tool such as a circular saw machine that mounts a battery pack as a power source in a housing.
[0002]
[Prior art]
For example, a circular saw machine includes a base and a main body in which a disk-shaped saw blade is provided orthogonal to a motor housing that houses a motor. A handle housing is continuously provided on the side of the motor housing, A battery pack is detachably attached to the end of the housing. In such a circular saw machine, when exchanging the saw blade, etc., set it on a work table or the like with the motor housing facing down, and tighten the bolt that fixes the center of the saw blade using a hexagon wrench or the like. I was working to release it. In addition, the main body is provided with a lock member that can lock the rotation of the spindle in which the motor output shaft or the saw blade is directly fixed at the lock position to be pushed into the main body, and is urged to the unlock position protruding from the main body. The lock member is pushed into the lock position to lock the rotation of the output shaft or the spindle, whereby the bolt can be tightened or released.
[0003]
[Problems to be solved by the invention]
In recent years, there has been a remarkable spread of rechargeable power tools, and accordingly, an increase in the amount of work per charge has been desired by users. As a solution, the capacity of the battery is increasing, but there are still limits in the current technology.
Therefore, the battery pack itself tends to be enlarged (high voltage), and the weight of the 24V battery pack is 1.5 kg.
In the above circular saw machine using such a battery pack, when attaching and detaching the saw blade, a heavy battery pack is located on the side of the main body, so that the circular saw machine is not satisfactorily operated. It is desirable to remove the battery pack in advance, because it becomes difficult. Therefore, as disclosed in Utility Model Registration No. 2541084, a special tool such as a hexagon stick wrench is attached to the housing so that the battery pack is positioned in the removal direction, and the special tool can be removed without removing the battery pack from the housing. If it is not configured, the battery pack is removed first when the dedicated tool is used. However, since the battery pack can be detached and attached without removing the dedicated tool from the housing, the battery pack is not necessarily removed when the saw blade is attached or detached.
[0004]
Accordingly, an object of the present invention is to provide a rechargeable electric tool in which a battery pack is reliably removed when a saw blade is attached or detached regardless of the presence or absence of a dedicated tool.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, a battery pack is detachably attached to a housing containing a motor, while torque is transmitted from the output shaft of the motor or the output shaft to the housing. A rechargeable electric motor provided with a lock member that is slidable between a lock position that locks the rotation of any one of the spindles to be unlocked and an unlock position that releases the lock to the unlock position. A locking member that interlocks with the lock member to slide to the lock position, and that contacts the battery pack and prevents the lock member from sliding before reaching the lock position; It is characterized by being provided integrally with the member or separately.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a sectional view of a rechargeable circular saw machine (hereinafter referred to as “circular saw machine”), FIG. 2 is a rear view thereof, FIG. 3 is a plan view thereof, and the circular saw machine 1 has a rectangular base. 2 and a main body 3 disposed on the base 2. In the main body 3, 4 is a blade case, and a motor housing 6 incorporating a motor 7 is connected to a cylindrical portion 5 at the rear (the right side in FIG. 1 is described as the rear), and an output shaft 8 of the motor 7. Protrudes into the cylindrical portion 5 and is pivotally supported by the ball bearing 9. In the cylindrical portion 5, a spindle 12 is supported in parallel with the output shaft 8 by ball bearings 10 and 11, a gear 13 integral with the spindle 12 meshes with the output shaft 8, and the rotation of the output shaft 8 is rotated by the spindle. 12 can be transmitted. Further, at the tip of the spindle 12, a disc-shaped saw blade 15 is sandwiched between an inner flange 16 and an outer flange 17 that are fitted to the chamfered portion 14 of the spindle 12, and from the front of the outer flange 17 to the spindle 12. The saw blade 15 is fastened integrally with the spindle 12 by screwing the hexagon socket head bolt 18 to be screwed together.
[0007]
2 and 3, the blade case 4 has one end in the longitudinal direction of the base 2 (left side in FIGS. 2 and 3) rotatably connected to the base 2 and the other end. Is slidably connected along an arcuate guide member 19 erected on the base 2, and the other end is fastened by a lever 20 at an arbitrary position of the guide member 19. The protrusion amount (cut amount) of the saw blade 15 from below can be adjusted.
On the other hand, 21 is a handle that is provided 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, 23 project from the left and right of the portion 22. A pair of slide rails 25, 25 formed on both sides of the upper surface of the battery pack 24 are fitted between the guide rails 23, 23 to slide, whereby the battery pack 24 is mounted on the mounting portion 22 and the mounting portion. The positive and negative terminals 26 (shown in FIG. 4) provided on 22 are electrically connected to positive and negative charging terminals (not shown) on the battery pack 24 side. A switch lever 42 is provided above the handle 21.
[0008]
Further, in the cylindrical portion 5 of the blade case 4, a belt-like shaft lock 27 as a lock member is slidable along the longitudinal direction of the base 2 behind the ball bearing 9 that supports the output shaft 8. Is housed in. The shaft lock 27 has a ring portion 28 through which the output shaft 8 passes in the center, and a stopper piece 29 bent above the ring portion 28 is formed on the cylindrical portion 5 in parallel with the sliding direction of the shaft lock 27. A shaft spring side of the blade case 4 (on the left side of FIGS. 2 and 3, hereinafter referred to as a shaft lock 27 and a joint 35 described later in FIG. 3 will be described as the rear and the right side as the front. 2 and 3 where the stopper piece 29 abuts against the rear inner surface of the recess 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 cylindrical. It protrudes from the side of the part 5. On the other hand, a fitting recess 30 is formed on the inner periphery of the ring portion 28 so as to be fitted to a chamfered portion 8 a having a two-sided width formed on the output shaft 8, and the shaft lock 27 is biased by the coil spring 34. The fitting recess 30 is fitted into the chamfered portion 8a by being pushed into the cylindrical portion 5 against the rotation of the output shaft 8 (lock position).
[0009]
Further, on the extension of the contact portion 32 extending in the pushing direction of the shaft lock 27 in the handle 21, a band plate-like joint 35 as an interlocking body can slide along the longitudinal direction of the base 2. Is housed in. This joint 35 also has a stopper piece 36 extending upward in a recess 39 formed parallel to the joint 35 by the handle 21 and is urged rearward by a coil spring 40 accommodated in the recess 39. 2 and 3 in which the rear end bent portion 37 formed obliquely and stops at the boss 41 in the handle 21 stops, the front end portion 38 is the upper surface of the battery pack 24 attached to the handle 21. The bent portion 37 at the rear end is located in front of the abutting portion 32 of the shaft lock 27 and can be controlled to advance to the lock position of the shaft lock 27.
[0010]
In the circular saw machine 1 configured as described above, when the saw blade 15 is removed for replacement or the like, the circular saw machine 1 is set on a work table or the like with the motor housing 6 facing down, and a hexagonal hole is provided. Loosen the bolt 18 with a hexagon wrench. 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 advanced shaft lock 27 comes into contact with the bent portion 37 of the joint 35 to advance the joint 35. When the battery pack 24 is mounted on the mounting portion 22 of the handle 21, the front end portion 38 of the joint 35 immediately comes into contact with the upper surface of the battery pack 24 and stops, and the shaft lock 27 is restricted from moving forward. As indicated by a two-dot chain line in FIG. 2, 27 does not reach the lock position where the fitting recess 30 is fitted to the chamfered portion 8 a of the output shaft 8, and the rotation of the output shaft 8 and 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. Therefore, the joint 35 moves forward without any obstacle as the shaft lock 27 is pushed, so that the shaft lock 4 and 5 can be advanced to the locked position as shown in FIGS. 4 and 5, and the fitting recess 30 is fitted to the chamfered portion 8 a 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 hexagon socket head bolt 18 can be rotated. The same applies to the case where the saw blade 15 is mounted on the spindle 12.
[0011]
As described above, according to the above-described embodiment, the shaft lock 27 used when the saw blade 15 is attached and detached is used, the shaft lock 27 is interlocked with the slide to the lock position, and the battery pack 24 is reached before reaching the lock position. Since the joint 35 is provided so as to prevent the shaft lock 27 from sliding, the battery pack 24 cannot be pushed (the spindle 12 is locked) when the battery pack 24 is mounted. After removing 24, the shaft lock 27 is pushed in, the spindle 12 is locked, and the procedure of attaching / detaching the saw blade 15 is established. In particular, since this procedure is established regardless of the presence or absence of a dedicated tool such as a hexagonal bar wrench attached to the circular saw machine 1 itself, the battery pack 24 is surely removed when the saw blade 15 is attached or detached. Become. Therefore, it is possible to set the circular saw machine 1 in a stable state and to attach and detach the saw blade 15 with good workability. Even if the switch lever 42 is operated by mistake, there is no possibility that the saw blade 15 rotates.
[0012]
In the above embodiment, a space is provided between the shaft lock 27 and the joint 35 so that the joint 35 is interlocked after the shaft lock 27 is slightly slid. It is good also as a structure where 35 is interlocked simultaneously. Further, the interlocking body such as the joint 35 may be integrally connected to the shaft lock 27 or the integrated interlocking body portion may be shortened depending on the distance from the battery pack 24. Furthermore, the shape of the lock member is not limited to the shape of the shaft lock 27, and it is possible to change the shape such as providing a fitting recess with the output shaft on the side.
[0013]
On the other hand, in the above-described embodiment, the lock member and the interlocking body are arranged on a straight line so as to make contact with the battery pack located on the extension. For example, the battery pack is mounted next to the lock member. Even in such a case, the interlocking body pivotally supported in the center is arranged so that one end of the interlocking body is in contact with the lock member and the other end is in contact with the battery pack. A configuration is also conceivable in which the contact is made with the battery pack by swinging.
In the above embodiment, the output shaft is locked, but the spindle may be locked depending on the mounting position of the battery pack. The battery pack mounting structure is not limited to the slide mounting as described above, but may be a structure that can be inserted into and removed from the mounting part. If the type of power tool is provided with a lock member, a circular saw machine The present invention is not limited to cutters, grinders, and the like.
[0014]
【The invention's effect】
According to the first aspect of the present invention, the lock member that can lock the rotation of the output shaft or the spindle is interlocked with the slide to the lock position, and comes into contact with the battery pack before reaching the lock position. Since the interlocking body that can prevent sliding is provided integrally with or separately from the lock member, the lock member cannot be pushed in with the battery pack attached. A procedure is established that pushes to lock the output shaft or spindle. In particular, this procedure is established regardless of the presence or absence of a dedicated tool such as a hexagon wrench attached to the housing, so that the battery pack is surely removed when the saw blade of the circular saw machine is replaced.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view of a circular saw machine.
FIG. 2 is a rear view of the circular saw machine.
FIG. 3 is a plan view of a circular saw machine.
FIG. 4 is a rear view of the circular saw machine (in a state where a shaft lock is pushed in).
FIG. 5 is a plan view of a circular saw machine (in a state where a shaft lock is pushed in).
[Explanation of symbols]
1 .... Circular saw machine 2 .... Base 3 .... Main body 4 .... Blade case 5 .... Cylindrical part 6 .... Motor housing 7 ... Motor 8 ... Output shaft 12 .... Spindle, 15 ... saw blade, 18 ... hexagon socket head bolt, 21 ... handle, 24 ... battery pack, 27 ... shaft lock, 30 ... fitting recess, 35 ... joint.

Claims (1)

A battery pack is detachably attached to a housing that contains a motor, and a lock position that locks the rotation of either the output shaft of the motor or a spindle that transmits torque from the output shaft in the housing; A rechargeable electric tool provided with a lock member that can be slid between an unlock position and a lock release position for releasing the lock,
An interlocking body capable of interlocking with the slide to the lock position and abutting against the battery pack and preventing the lock member from sliding before reaching the lock position is integrated with or separate from the lock member. A rechargeable power tool provided on the body.

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