JP2006326780A - Power tool with cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power tool with a cutter having a device for disenabling the changing operation of the cutter or changing of the direction of the cutter during moving of the cutter. <P>SOLUTION: The power tool 1 with the cutter has a cover 4 slidably mounted to a housing 3, cutters 2a, 2b held to the housing 3 by the cover 4, and an operation switch 5 turning on and off the power of a motor 6. A lock button 8 which releasably holds the position of the cover 4 to the housing 3 is provided between the housing and the cover 4 in such a state that the mounting parts of the cutters 2a, 2b are covered. A release prevention device 9 preventing the lock button 8 from being made in an unlocked state in the ON state of the operation switch 5 is provided between the lock button 8 and the operation switch 5. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric tool having a cutting tool, such as a gardening hair clipper.

Conventionally, a gardening hair clipper (a power tool with a blade) described in Patent Documents 1 and 2 is known.
The gardening hair clipper described in Patent Document 1 has a housing in which a motor is built, a fixed blade, and a movable blade. The fixed blade and the movable blade are pivotally supported by the fixed blade so as to be swingable, and the fixed blade is attached to the housing by being fixed to the lower portion of the housing with a screw.
The gardening hair clipper described in Patent Document 2 includes two blades that are reciprocally held between an upper stay and a lower stay attached to the lower surface of the housing, and two switches. The blade is moved by the power of the motor by operating both.
JP-A-4-18311 JP-A-7-203768

However, the blades related to the gardening clippers according to Patent Documents 1 and 2 are consumables and are sometimes replaced. Alternatively, the direction of the blade may be changed with respect to the housing for ease of use. Therefore, there has been a demand for an apparatus for preventing the blade from being changed or the direction of the blade from being changed while the blade is moving. However, heretofore such an apparatus has not been known.
Then, this invention makes it a subject to provide the electric tool with a cutter provided with the apparatus which makes the exchange operation | work of a cutter and change of the direction of a cutter impossible when the cutter is moving.

In order to solve the above-mentioned problems, the present invention is an electric tool with a blade having a configuration as described in each claim.
That is, according to the first aspect of the present invention, the cover has a cover that can be slid and attached to the housing, and the cover can be released from the housing in a state where the attachment portion of the blade is covered between the cover and the housing A lock button for holding the position is provided. A release preventing device is provided between the lock button and the operation switch to prevent the lock button from being released when the operation switch is turned on.
Therefore, the lock button cannot be released when the operation switch is turned on and the blade is moved by the motor. Therefore, it is impossible to remove the cover with the lock button released and thereby remove the blade from the housing, or change the orientation of the blade relative to the housing.

According to the invention described in claim 2, the release preventing device is configured to prevent the operation switch from being turned on when the lock button is set to the release state.
Therefore, when the lock button is released and the cover is to be removed from the housing, it is possible to prevent the operation switch from being turned on by mistake. Therefore, it is possible to prevent the cutter from being moved by mistake when attempting to remove the cover from the housing in order to replace the cutter or change the orientation of the cutter.

According to a third aspect of the present invention, the release preventing device has an operating rod provided between the operation switch and the lock button. And by setting the operation switch to the on state, the operation rod is pushed by the operation switch and moved to the lock button side, and the lock button is prevented from being released.
Therefore, the release preventing device is configured to mechanically disable the lock button by the operating rod.

(Embodiment 1)
A lawn hair clipper (horticultural hair clipper) 1 which is one of power tools with a blade will be described with reference to FIGS.
The lawn hair clipper 1 has a housing 3, a cover 4, and a blade assembly 2 as shown in FIGS.

The cover 4 is slid and attached to the housing 3, and holds the blade assembly 2 with respect to the housing 3 by being attached. And the cover 4 covers the attachment part (base end part) of the blade assembly 2 from the lower side.
The housing 3 is provided with a lock button 8 that holds the cover 4 in a releasable position in a state where the blade assembly 2 is held (a state where the attachment portion of the blade assembly 2 is covered).
The housing 3 has an operation switch 5 that is turned on and off as shown in FIG. 2, a motor 6 that operates when the operation switch 5 is turned on, and a drive that transmits the power of the motor 6 to the blade assembly 2. A mechanism 7 is provided.
A release prevention device 9 is provided between the lock button 8 and the operation switch 5.

The housing 3 has a hollow shell shape as shown in FIG. 1 and has a pair of left and right shell bodies 3a and 3b. A handle portion 30 is formed on the upper portion of the housing 3, and an operation switch 5 is provided on the lower portion of the handle portion 30.
As shown in FIG. 2, the operation switch 5 has a shaft portion 5 b that is attached to the housing 3 so as to be tiltable. A biasing member 17 that biases the operation switch 5 in the protruding direction (OFF direction) is provided between the operation switch 5 and the push switch 10. Therefore, when the operation switch 5 is pushed against the urging member 17, the operation switch 5 tilts around the shaft portion 5 b and enters an on state (ON state). Then, by entering the inset state, the retracting pin 10a of the push switch 10 provided in the housing 3 is pushed.

The push switch 10 electrically connects the motor 6 built in the housing 3 and the power cord 11 by pressing the retracting pin 10a. Therefore, when the operation switch 5 is pressed, the motor 6 operates, and when the force pressing the operation switch 5 is released, the operation switch 5 returns to the off state and the motor 6 stops.
The motor 6 includes a rotating shaft 6a that rotates and a pinion gear 6b fixed to the rotating shaft 6a.

As shown in FIG. 2, the drive mechanism 7 is a mechanism for converting the output of the motor 6 into the reciprocating motion of the blades 2a and 2b of the blade assembly 2, and has a plurality of gears 7a and 7b and omnidirectional cams 7c and 7d. is doing.
The gear 7 a is pivotally supported by an operating rod 9 a attached to the housing 3. On the other hand, the gear 7 b is pivotally supported by a shaft member 7 e attached to the housing 3.
The gear 7a integrally has a large gear portion 7a1 meshing with the pinion gear 6b and a small gear portion 7a2 meshing with the gear 7b. Unicentric cams 7c and 7d are fixed to the gear 7b.

  As shown in FIG. 2, the eccentric cam 7c is installed in a cam insertion hole 2a1 formed in the blade 2a (see FIG. 4), and rotates to reciprocate the blade 2a. On the other hand, the eccentric cam 7d is installed in a cam insertion hole 2b1 formed in the blade 2b and reciprocally swings the blade 2b by rotating. The blades 2a and 2b are reciprocally swung in substantially opposite directions by the omnidirectional cams 7c and 7d.

As shown in FIG. 4, the blade assembly 2 includes a support plate 2c in addition to the two blades (movable blades) 2a and 2b. The blades 2a and 2b and the support plate 2c are assembled so as to be rotatable by a pin 2d and an E-ring 2e as shown in FIGS.
As shown in FIG. 3, the support plate 2 c has a substantially disk shape, and has a plurality of (for example, three) force receiving portions 2 c 1 protruding downward.

As shown in FIGS. 3 and 4, the cover 4 includes a plurality of (for example, two) engaging portions 4 a that are locked to the housing 3, and a plurality (for example, three) of pressing portions 4 b that press the blade assembly 2 against the housing 3. have.
As shown in FIG. 7, the engaging portion 4 a is formed in a substantially L shape, and is engaged with the engaging portion 3 d of the housing 3.
As shown in FIGS. 3 and 7, the locking portion 3 d of the housing 3 is recessed in the peripheral wall surface of the opening 3 e formed at the bottom of the housing 3. The housing 3 is formed with an insertion portion 3c for inserting the engaging portion 4a of the cover 4 into the locking portion 3d.
Therefore, by inserting the engaging portion 4a into the insertion portion 3c (see FIG. 3) and sliding the cover 4 in the direction of the arrow X shown in FIG. 5, the engaging portion 4a engages with the engaging portion 3d as shown in FIG. The cover 4 is attached to the housing 3.

  The pressing portion 4b is formed in a protruding shape from the cover 4 as shown in FIGS. The pressing portion 4 b attaches the cover 4 to the housing 3, thereby pressing the force receiving portion 2 c 1 of the blade assembly 2 and pressing the peripheral edge of the upper surface of the support plate 2 c of the blade assembly 2 against the housing 3. Therefore, the blade assembly 2 is held on the housing 3 side by attaching the cover 4 to the housing 3.

As shown in FIG. 3, the lock button 8 has a mounting portion 8a and an elastic piece 8b.
The attachment portion 8 a is attached to the housing 3 by being sandwiched between the shells 3 a and 3 b of the housing 3.
As shown in FIG. 2, the elastic piece 8b protrudes from the mounting portion 8a toward the cover 4 in a cantilever shape. The elastic piece 8 b is pushed by the cover 4 and elastically deformed by pressing the cover 4 against the housing 3 in order to attach the cover 4 to the housing 3. As shown in FIGS. 5 and 6, the cover 4 continues to be elastically deformed while the cover 4 is being rotated with respect to the housing 3.
On the other hand, the cover 4 is provided with a positioning portion 4c. When the positioning portion 4c is moved to a position corresponding to the lock button 8, the elastic piece 8b is elastically returned, and the elastic piece 8b is fitted into the positioning portion 4c. Accordingly, the cover 4 is held with respect to the housing 3 by the positioning mechanism 22 including the lock button 8 and the positioning portion 4c.

The release prevention device 9 is a device for preventing the lock button 8 from being released when the operation switch 5 is turned on. As shown in FIG. 2, the operation rod 9a and the support portions 9b and 9c are provided. And a biasing member 9d.
The actuating bar 9 a is disposed above the lock button 8 and below the projecting piece 5 a of the operation switch 5. The actuating rod 9a has a lower extending portion 9a1 extending toward the elastic piece 8b of the lock button 8 on the lower side, and an upper extending portion 9a2 extending toward the protruding piece 5a on the upper side. is doing.

The support portions 9b and 9c are formed in the housing 3, and support the lower side portion and the upper side portion of the operating rod 9a so as to be vertically movable.
The biasing member 9d biases the actuating rod 9a downward by having its upper end abutted against the overhanging piece 3i of the housing 3 and its lower end abutting against the upper end of the actuating rod 9a. The actuating bar 9a is urged downward to push the elastic piece 8b of the lock button 8 downward (on the locked state side).

  When removing the cover 4 and the blade assembly 2 from the housing 3, first, the elastic piece 8b of the lock button 8 is pushed in the release direction (unlock direction), and the elastic piece 8b is released from the positioning portion 4c. (See FIGS. 6 and 9). Then, the cover 4 is rotated in the direction opposite to the arrow X direction in FIG. As a result, the cover 4 can be removed from the housing 3, and then the blade assembly 2 can be removed from the housing 3.

Next, the operation of the release preventing device 9 will be described.
The release preventing device 9 has two functions as shown in FIGS.
The first action is an action that disables the lock button 8 from being released when the operation switch 5 is pressed (entered state) as shown in FIG. That is, when the operation switch 5 is pressed, the operation switch 5 rotates about the shaft portion 5b, and the projecting piece 5a of the operation switch 5 tilts downward. And the overhang | projection piece 5a contact | abuts to the upper side extension part 9a2 of the action | operation rod 9a, and prevents the movement to the upper direction of the action | operation bar 9a. Therefore, the elastic piece 8b of the lock button 8 cannot be elastically deformed upward by the operating rod 9a, and the lock button 8 cannot be pushed to the released state.

  As shown in FIG. 9, the second action of the release prevention device 9 is an action that disables the operation switch 5 from being turned on when the elastic piece 8b of the lock button 8 is pushed upward (release state). is there. That is, when the lock button 8 is pressed, the operating rod 9a moves upward against the biasing member 9d. Then, the upper extending portion 9a2 of the operating rod 9a contacts the overhanging piece 5a of the operation switch 5. Therefore, the operation switch 5 cannot be rotated toward the on state, and cannot be operated.

The lawn hair clipper 1 is configured as described above.
That is, as shown in FIG. 2, between the lock button 8 and the operation switch 5, a device for preventing the lock button 8 from being released when the operation switch 5 is turned on as shown in FIG. Is provided.
Therefore, the lock button 8 cannot be released when the operation switch 5 is turned on and the blades 2a and 2b are moved by the motor 6. Therefore, the lock button 8 is released and the cover 4 is removed, so that the blade assembly 2 (the blades 2a and 2b) cannot be removed from the housing 3.
Further, when the operation switch 5 is in the on state, it is possible to prevent the lock button 8 from hitting something and the lock button 8 from being accidentally released.

Further, as shown in FIG. 9, the release prevention device 9 is configured to prevent the operation switch 5 from being turned on when the lock button 8 is released.
Therefore, when the lock button 8 is released and the cover 4 is to be removed from the housing 3, it is possible to prevent the operation switch 5 from being turned on by mistake. Therefore, when the cover 4 is to be removed from the housing 3 in order to replace the blade assembly 2 (the blades 2a and 2b), it is possible to prevent the blades 2a and 2b from being moved by mistake.

Further, the release prevention device 9 has an operating rod 9a provided between the operation switch 5 and the lock button 8 as shown in FIG. Then, by turning the operation switch 5 to the on state, the operation rod 9a is pushed by the operation switch 5 and moves to the lock button 8 side, thereby restricting the lock button 8 from being released.
Therefore, the release prevention device 9 is configured to mechanically disable the lock button 8 by the operating rod 9a.

(Embodiment 2)
The second embodiment will be described with reference to FIGS.
The second embodiment is formed in substantially the same manner as the first embodiment. However, as shown in FIGS. 11 and 12, the blade assembly 2 is different from the first embodiment in that the direction of the blade assembly 2 can be changed with respect to the housing 3. Hereinafter, the second embodiment will be described focusing on the differences.

The lawn hair clipper 1 according to the second embodiment has a housing 3, a blade assembly 2 and a cover 14 as shown in FIG.
A rotating member 15 and a positioning member 16 are attached to the bottom of the housing 3 in order to change and hold the orientation of the blade assembly 2.
The rotating member 15 has a donut disk shape, and has a convex portion 15a that is slidably latched with a groove 3f formed in the housing 3 as shown in FIG.
As shown in FIGS. 11 and 12, the rotary member 15 is formed with a bottom recess 15 c in which the blade assembly 2 is installed. Therefore, the rotating member 15 is changed in direction with respect to the bottom surface of the housing 3 together with the blade assembly 2.

The positioning member 16 is a member that positions and holds the rotating member 15 with respect to the housing 3, and is formed of a plate material as shown in FIG.
The positioning member 16 is inserted into the insertion hole 15 d of the rotating member 15 and is sufficiently inserted into the housing 3 side, so that the tip portion comes into contact with the fixed portion 3 h of the housing 3. Alternatively, it comes into contact with the fixed portion 3g of the housing 3 shown in FIG. Therefore, the positioning member 16 positions and holds the rotating member 15 in the normal position shown in FIG. 11 and the right-angled position shown in FIG. Therefore, the blade assembly 2 can be changed to a normal position (position in FIG. 11) extending in the longitudinal direction of the housing 3 and a right angle position (position in FIG. 12) extending in the short direction of the housing 3. .

The cover 14 is attached to the rotating member 15 by sliding with respect to the rotating member 15. And the cover 14 hold | maintains the cutter assembly 2 in the housing 3 side in the state attached to the rotation member 15, and covers the attaching part (base end part) of the cutter assembly 2 from lower side.
As shown in FIG. 10, the rotary member 15 is provided with a lock button 18 that holds the cover 14 in a releasable position. On the other hand, the cover 14 is formed with a concave positioning portion 14c into which the lock button 18 is fitted.

The lock button 18 is cylindrical as shown in FIG. 10 and is inserted into the mounting hole 15 b of the rotating member 15. And the retaining member 13 is attached to an upper end part, and the fall-down is prevented. A fitting portion 18 a that is fitted into the positioning portion 14 c of the cover 14 is formed at the lower end portion of the lock button 18.
A biasing member 12 that biases the lock button 18 downward is attached between the fitting portion 18 a and the rotating member 15.

  As shown in FIGS. 11 and 12, a plurality of (for example, two) lock buttons 18 and 18 are attached to the rotating member 15. On the other hand, the cover 14 is formed with one positioning portion 14c as shown in FIG. The positioning part 14c is engaged with the lock button 18 located at the rear by moving to the lock button 18 located at the rear (left part shown in FIGS. 11 and 12). Therefore, the cover 14 is fixed to the housing 3 at both the normal position shown in FIG. 11 and the right angle position shown in FIG.

A release preventing device 19 is provided between the lock button 18 and the operation switch 5 as shown in FIG.
The release prevention device 19 includes an operating rod 19a, support portions 19b and 19c that support the operating rod 19a so as to be movable up and down, and a biasing member 19d that biases the operating rod 19a downward.
The actuating bar 19 a is disposed on the axis of the lock button 18, above the lock button 18, and below the projecting piece 5 a of the operation switch 5. The actuating bar 19a has a lower extending portion 19a1 extending to the lock button 18 and an upper extending portion 19a2 extending to the overhanging piece 5a.

  The drive mechanism 7 built in the housing 3 has a gear 7a and a gear 7b, and the gear 7a is pivotally supported with respect to the operating rod 19a. On the other hand, the gear 7 b is pivotally supported by a shaft member 7 e attached to the housing 3.

  When changing the orientation of the blade assembly 2 from the position shown in FIG. 11 to the position shown in FIG. Push up against the member 12 (see FIGS. 13 and 14). Then, the fitting portion 18a is released from the positioning portion 14c, and in this state, the cover 14 is rotated in the direction opposite to the arrow X direction in FIG. 5 to remove the cover 14 from the housing 3 side.

Next, the positioning member 16 is pulled to separate the upper end portion of the positioning member 16 from the fixed portion 3h of the housing 3 (see FIG. 14). Then, the rotating member 15 is rotated from the normal position shown in FIG. 11 to the right angle position shown in FIG. 12, the positioning member 16 is inserted into the housing 3, and the upper end portion of the positioning member 16 is fixed to the right angle position formed in the housing 3. It abuts on the part 3g. Thereafter, the cover 14 is attached to the housing 3 side.
When the direction of the blade assembly 2 is changed from the position shown in FIG. 12 to the position shown in FIG. 11, it can be performed by the same method as described above.
Therefore, according to this embodiment, it is possible to change the orientation of the blade assembly 2 with respect to the housing 3 without using a tool.

Next, the operation of the release preventing device 19 will be described.
The release preventing device 19 has two functions as shown in FIGS.
The first action is an action that disables the lock button 18 from being released when the operation switch 5 is pressed (entered state) as shown in FIG. That is, when the operation switch 5 is pressed, the operation switch 5 rotates about the shaft portion 5b, and the projecting piece 5a of the operation switch 5 tilts downward. And the overhang | projection piece 5a contact | abuts to the upper side extension part 19a2 of the action | operation bar 19a, and prevents the movement to the upper direction of the action | operation bar 19a. Therefore, the lock button 18 cannot be slid upward by the operating rod 19a, and the lock button 18 cannot be pushed to the released state.

  The second action of the release prevention device 19 is an action that disables the operation switch 5 from being turned on when the lock button 18 is pushed upward (release state) as shown in FIG. That is, when the lock button 18 is pressed, the operating rod 19a moves upward against the biasing member 19d. Then, the upper extending portion 19 a 2 of the operating rod 19 a comes into contact with the overhanging piece 5 a of the operation switch 5. Therefore, the operation switch 5 cannot be rotated toward the on state, and cannot be operated.

The lawn hair clipper 1 is configured as described above.
That is, a release preventing device 19 is provided between the lock button 18 and the operation switch 5 to prevent the lock button 18 from being released when the operation switch 5 is turned on as shown in FIG. .
Accordingly, the lock button 18 cannot be released when the operation switch 5 is turned on and the blades 2a and 2b are moved by the motor 6. Therefore, the lock button 18 is released and the cover 14 is removed, so that the blade assembly 2 (the blades 2a and 2b) cannot be reoriented with respect to the housing 3.

Further, as shown in FIG. 14, the release prevention device 19 is configured to prevent the operation switch 5 from being turned on when the lock button 18 is released.
Therefore, when the lock button 18 is released and the cover 14 is to be removed from the housing 3, it is prevented that the operation switch 5 is erroneously turned on. Therefore, when the cover 14 is to be removed from the housing 3 in order to change the orientation of the blade assembly 2 (the blades 2a and 2b), it is possible to prevent the blades 2a and 2b from being moved by mistake.

(Other embodiments)
The present invention is not limited to the first and second embodiments, and may be the following modes.
(1) That is, Embodiments 1 and 2 are forms relating to a lawn hair clipper which is one of gardening hair clippers. However, a hedge trimmer which is one of gardening hair clippers and other electric tools having a cutting tool, which may have a release preventing device according to the first and second embodiments, may be used.
(2) The lock button according to the first and second embodiments is a button type that is released by being pressed. However, it may be a slide-type lock button that is in a released state when it is slid or a toggle-type lock button that is in a released state when it is tilted.
(3) The cover according to the first and second embodiments is configured to be attached to the housing side by rotating and sliding with respect to the housing. However, the lock button may be attached by being slid linearly with respect to the housing in the front-back direction or the left-right direction with respect to the housing.
(4) The release preventing device 19 according to the second embodiment has the urging member 19d as shown in FIG. 10, but may be in a form without the urging member 19d.

1 is a perspective view of a lawn hair clipper according to a first embodiment. It is a right view of the lawn hair clipper concerning Embodiment 1 of the state which removed the right side shell. FIG. 3 is a perspective view of a part of the blade assembly, the cover, and the housing according to the first embodiment. FIG. 3 is a perspective view of a part of the blade assembly, the cover, and the housing according to the first embodiment. It is a bottom view of the lawn hair clipper concerning Embodiment 1 in the middle of cover attachment. It is a bottom view of the lawn hair clipper concerning Embodiment 1 after a cover attachment. FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. It is a right view corresponding to FIG. 2 of the lawn hair clipper concerning Embodiment 1 for demonstrating the effect | action of a cancellation | release prevention apparatus. It is a right view corresponding to FIG. 2 of the lawn hair clipper concerning Embodiment 1 for demonstrating the effect | action of a cancellation | release prevention apparatus. It is a right view of the lawn hair clipper concerning Embodiment 2 of the state which removed the right side shell. It is a bottom view of the lawn hair clipper concerning Embodiment 2 in the state where the cover was removed. It is a bottom view of the lawn hair clipper concerning Embodiment 2 in the state where the cover was removed. It is a right view corresponding to FIG. 10 of the lawn hair clipper concerning Embodiment 2 for demonstrating the effect | action of a cancellation | release prevention apparatus. It is a right view corresponding to FIG. 10 of the lawn hair clipper concerning Embodiment 2 for demonstrating the effect | action of a cancellation | release prevention apparatus.

Explanation of symbols

1 ... Lawn hair clipper (electric tool with blade)
2 ... Blade assembly 2a, 2b ... Blade 2c ... Support plate 3 ... Housing 4, 14 ... Cover 5 ... Operation switch 6 ... Motor 7 ... Drive mechanism 8, 18 ... Lock button 8a ... Mounting portion 8b ... Elastic piece 9, 19 ... Release prevention device 9a, 19a ... Actuating rod 9a1, 19a1 ... Lower extension 9a2, 19a2 ... Upper extension 10 ... Push switch 15 ... Rotating member 16 ... Positioning member

Claims (3)

A housing containing a motor; a cover that is slidably mounted on the housing; a blade whose mounting portion is covered by the cover; and an operation switch that turns on and off the power of the motor. The cutting tool is a power tool with a blade that moves by the power of the motor,
Between the housing and the cover, a lock button is provided that holds the cover in a releasable position with respect to the housing in a state of covering the attachment portion of the blade,
A cutter for preventing release of the lock button from being released when the operation switch is turned on is provided between the lock button and the operation switch. With electric tool. The electric tool with a blade according to claim 1,
The release preventing device is configured to prevent the operation switch from being turned on when the lock button is in the released state. The electric tool with a blade according to claim 1 or 2,
The release prevention device has an operating rod provided between the operation switch and the lock button, and when the operation switch is turned on, the operation rod is pushed by the operation switch to the lock button side. A power tool with a blade, characterized in that it is configured to restrict the movement of the lock button to a released state.

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