JPH04269503A - Electrically-driven cutting tool machinery and apparatus - Google Patents

Abstract

PURPOSE:To check a blade easily by rotating the blade manually in the state of off-locking a power source switch and setting the checking mode. CONSTITUTION:A first stopper section 2 for retaining a power switch 1 in the off state and a second stopper section 4 for locking the rotation of a blade are provided. The blade replacement mode for locking the rotation of the blade and the off state of the power source switch 1, a blade checking mode for locking the power source switch 1 only in the off state and the using mode for releasing the locked state of the rotation of the blade and the locked state of the power source switch 1 are provided to be respectively switched over freely.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electric cutter equipment such as circular saws and lawn mowers whose blades can be removed for replacement or polishing.

0002

[Prior Art] Conventionally, this type of electric knife equipment has been disclosed in Japanese Utility Model Application No. 59-5302 and Japanese Utility Model Application No. 59-8791.
There is one disclosed in Publication No. 0. This has a structure that locks the blade so that it does not rotate when removed, and also prevents the power switch from being turned on at the same time.

0003

[Problems to be Solved by the Invention] However, before sharpening or replacing the blade, it is necessary to check the condition of the blade for spillage, etc. However, in the case of the above-mentioned conventional example, since the blade is simply locked to prevent rotation when replacing the blade, there is a problem in that it is not possible to rotate the blade by hand and check the entire circumference.

The present invention aims to solve the above-mentioned problems, and it is possible to check the blade by providing a blade condition check mode, that is, a mode in which the blade can be checked by rotating the blade by hand with the power switch turned off and locked. The aim is to provide an electric knife device that can be easily used.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the electric knife device of the present invention has a first stopper portion 2 that holds the power switch 1 in an OFF state, and a second stopper portion 2 that locks the rotation of the blade 3. A locking means having a stopper part 4 is provided, and the blade change mode locks the rotation of the blade 3 and the off state of the power switch 1, the blade check mode locks only the power switch 1 in the off state, and the blade check mode locks the power switch 1 in the off state. It is characterized in that the locking means can be freely switched between rotation and a usage mode in which the power switch 1 is released from the locked state.

[0006]

[Operation] According to the above configuration, in addition to the blade exchange mode in which the rotation of the blade 3 and the off state of the power switch 1 are locked and the usage mode in which the lock is released, the blade 3 is allowed to rotate freely and only the power switch 1 is locked. It has a blade check mode, and in this blade check mode, the blade 3 can be checked by rotating the blade by hand.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below using an example of a circular saw. As shown in FIGS. 1 to 4, a motor 7 and a gear box 8 are disposed in the housing in which the handle portion of the circular saw body 6 is formed, and a central portion controls the on/off operation of the motor 7. There is a power switch 1, and a power switch 1
A contact fitting 9 is provided protruding toward the battery pack 8 from the rear end thereof, and the contact fitting 9 is connected to the battery pack 8. The motor 7 is fixed to a gear box 8, and as shown in FIG. 4, a pinion 12 that meshes with a gear 11 is fixed to the motor shaft 10. Gear 11 and gear 13 are bearing 1
The gear 13 is fixed to a shaft 15 rotatably supported by the output shaft 16, and the gear 13 is further arranged to mesh with a gear 17 press-fitted and fixed to the output shaft 16. Bearing 18 and bearing 19
A fixed flange 20 is integrally provided at one end of the output shaft 16 which is rotatably supported by the output shaft 16 . The blade 3 is fixed with a screw 23. The gear box 8 is fixed to the housing of the circular saw body 6, and a lower guard 24 is rotatably supported at one end of the gear box 8, and is prevented from coming off with a retaining ring. This lower guard 24 is located outside the housing of the circular saw body 6, and a safety cover 26 is fixed to the outer periphery of the housing so as to surround the lower guard 24 and the blade 3. Further, the circular saw main body 6 is supported by a base 25, and a hole is made in the lower guard 24 so as not to contact the base 25.

In the center of the circular saw body 6, an off-lock switch 27 as a locking means is rotatably disposed on a shaft 28 protruding from the housing, and an operating handle protrudes outside the housing. The other end is provided with teeth 4a that engage with a pinion 12 in the gear box 8. This tooth 4a serves as the second stopper portion 4. Further, a long hole 29 is formed in the center of the off-lock switch 27. A stopper body 2a serving as a first stopper part 2 is attached to the side of the power switch 1 so as to be slidable left and right, and the main body 1a of the power switch 1 and the trigger 1b
A stopper body 2a can freely move in and out of the gap 1c between the two. A convex portion 30 provided at one end of the stopper body 2a is engaged with the elongated hole 29, so that the stopper body 2a is moved in the left-right direction when the off-lock switch 27 is rotated. A spring support rib is provided at one end of the stopper body 2a, and a spring 32 is attached to this spring support rib, and the spring 32 urges the stopper body 2a to enter the gap 1c. ing. The other end of the spring 32 is an off-lock switch 27.
The off-lock switch 27 is also urged in the opposite direction at the same time. Further, a spring support rib 34 is provided on the back side of the recess 33 of the off-lock switch 27, and a spring 35 is attached to the spring support rib 34.
The other end of the spring 35 is configured to abut against the housing.

The operation of the off-lock switch 27 will be explained as follows. FIG. 6A shows a state in which the off-lock switch 27 is not operated, and this state is a blade check mode. FIG. 6(b) shows a state in which the off-lock switch 27 is pulled toward the user to enter the blade exchange mode. FIG. 6(c) shows a state in which the off-lock switch 27 is pushed forward to enter the use mode. As shown in FIG. 6A, when the off-lock switch 27 is not operated (blade check mode), the lever position remains at an intermediate position due to the balance between the springs 32 and 35. At this time, the stopper body 2a, which is the first stopper part 2, is in the gap 1c of the power switch 1, and the trigger 1b of the power switch 1 cannot be pulled. As shown in FIG. 6(b), when the lever of the off-lock switch 27 is pulled forward (blade exchange mode), the teeth 4a of the second stopper 4 are engaged with the pinion 12, and the motor shaft 10, reduction gear is in a locked state. At this time, the convex portion 30 of the stopper body 2a moves along the long hole 29 provided in the off-lock switch 27, but the long hole 29 moves along the shaft 29 of the off-lock switch 27.
The stopper body 2a remains in a resting position because it has an arc shape with the center at , and is biased by the spring 32, so that the stopper body 2a remains at a rest position, and the power switch 1 cannot be turned on by operating the trigger 1b of the power switch 1. I can't. In addition, when the lever is pushed forward as shown in FIG. can be drawn. At this time, the tooth 4a at the tip of the off-lock switch 27 also rotates and is removed from the pinion 12.

When the device is being carried around or placed in a carrying case, the off-lock switch 27 is not operated, so it is in the state shown in FIG. 6(a), and the power switch 1 is not turned on. When checking the blade 3 before replacing the blade 3, the entire circumference of the blade 3 is checked by rotating the blade 3 by hand in the state shown in FIG. 6(a). When replacing the blade 3, pull the off-lock switch 27 toward you as shown in FIG. 6(b), lock the pinion 12 with the teeth 4a, prevent the fixed flange 20 from rotating, and use a wrench or spanner to conduct. At this time as well, the power switch 1 is in the off-lock state, and there is no possibility that the power switch 1 will be turned on. When in use, turn off the off-lock switch 27 as shown in Figure 6(c).
Push forward to release the lock of the pinion 12 and the off-lock of the power switch 1, and turn on the power switch 1 to start cutting. Off-lock switch 2 after use
When 7 is released, the springs 32 and 35 return to the state shown in FIG. 6(a), and the power switch 1 is placed in the off-lock state.

In addition, when the state shown in FIG. 6(b) suddenly occurs during operation, the brake (electrical A stop function is provided so that the target) is stopped.

0012

Effects of the Invention Since the present invention is constructed as described above, in addition to the blade exchange mode in which the rotation of the blade and the power switch are locked in the OFF state, and the use mode in which the lock is released, the blade can be freely rotated and the power switch is turned off. This device has a blade check mode in which only the switch is locked, and the blade can be easily and safely checked by rotating the blade by hand with the power switch turned off and locked. It is easy to use as it can be switched between blade exchange mode and usage mode.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an entire circular saw according to an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a front view of FIG. 1;

FIG. 4 is a sectional view showing the speed reduction unit same as above.

FIG. 5 is a sectional view showing a state in which the blade is attached.

FIG. 6 is an explanatory diagram illustrating the operation of the off-lock switch same as the above.

[Explanation of symbols]

1 Power switch 2 First stopper part 3 Blade 4 Second stopper part

Claims (1)

[Claims] 1. A lock means having a first stopper section that holds the power switch in the OFF state and a second stopper section that locks the rotation of the blade, and locks the rotation of the blade and the OFF state of the power switch. A blade exchange mode that locks the
An electric cutter device characterized in that a locking means can be freely switched between a blade check mode in which only the power switch is locked in the OFF state and a use mode in which the rotation of the blade and the power switch are unlocked.