An electric tool includes a housing accommodating a motor, and a break device and an operational member to turn on and turn off a drive switch of the motor. The brake device includes a brake plate fixed to an output shaft of the motor, a brake member is capable of moving toward and away from the bra
An electric tool includes a housing accommodating a motor, and a break device and an operational member to turn on and turn off a drive switch of the motor. The brake device includes a brake plate fixed to an output shaft of the motor, a brake member is capable of moving toward and away from the brake plate during rotation, and an urging unit urging the brake member toward an abutment position where the brake member abuts on the brake plate. The operational member is provided with a press member that comes into abutment on the brake member through an operation of turning on the drive switch of the motor and rotates the brake member in such a rotational direction as to move away from the brake plate against the urging of the urging unit.
대표청구항▼
1. An electric tool comprising: a housing accommodating a motor;an operational member provided on the housing to turn on and turn off a drive switch of the motor; anda brake device provided in the housing, wherein the brake device includes a brake plate fixed to an output shaft of the motor, a brake
1. An electric tool comprising: a housing accommodating a motor;an operational member provided on the housing to turn on and turn off a drive switch of the motor; anda brake device provided in the housing, wherein the brake device includes a brake plate fixed to an output shaft of the motor, a brake member that can perform an operation of moving toward and away from the brake plate, and an urging unit that urges the brake member toward an abutment position where the brake member abuts on the brake plate, whereinthe brake member is held in the housing so as to perform the operation of moving toward and away from the brake plate, andthe operational member is provided with a press member that comes into abutment on the brake member through an operation of turning on the drive switch of the motor and the press member rotates the brake member in such a rotational direction as to move the brake member away from the brake plate against urging of the urging unit. 2. The electric tool according to claim 1, wherein one of the housing and the brake member is provided with a lead groove,the other is provided with a pin that is loosely inserted in the lead groove,the lead groove and the pin hold the brake member in the housing to thereby enable the operation of moving toward and away from the brake plate during rotation, andthe lead groove is formed such that the brake member comes into abutment on the brake plate in a rotational direction reverse to a rotational direction of the output shaft. 3. The electric tool according to claim 1, wherein the press member and the brake member have abutment portions abutting on each other, one of the abutment portions being an inclined face,the inclined face provides guidance to rotate the brake member when the press member and the brake member come into abutment on each other, andthe other abutment portion guided by the inclined face is a rolling body that rolls on the inclined face. 4. The electric tool according to claim 2, wherein the press member and the brake member have abutment portions abutting on each other, one of the abutment portions being an inclined face,the inclined face provides guidance to rotate the brake member when the press member and the brake member come into abutment on each other, andthe other abutment portion guided by the inclined face is a rolling body that rolls on the inclined face. 5. The electric tool according to claim 2, wherein the brake member has a hollow cylinder portion extending in a direction of the operation of moving toward and away from the brake plate, and a circular plate portion provided at an end of the hollow cylinder portion on the brake plate side,the housing is provided therein with an annular rib protruding in the direction of the operation of moving toward and away from the brake plate, so that the hollow cylinder portion is held in the housing via the annular rib,the pin is so fixed to the annular rib as to protrude toward an axial center of the annular rib, andthe lead groove is formed in an outer periphery of the hollow cylinder portion. 6. The electric tool according to claim 5, wherein the housing is cylindrically formed,the pin forms a pair with another pin arranged point-symmetrically thereto with respect to a center of the housing, andthe lead groove forms a pair with another lead groove arranged point-symmetrically thereto with respect to the center of the housing. 7. The electric tool according to claim 3, wherein the brake member has a hollow cylinder portion extending in a direction of the operation of moving toward and away from the brake plate, and a circular plate portion provided at an end of the hollow cylinder portion on the brake plate side,the inclined face is formed on the abutment portion of the press member, andthe rolling body is so protruded from an outer periphery of the hollow cylinder portion as to be abuttable on the inclined face. 8. The electric tool according to claim 5 wherein the brake member has a brake shoe fixed to the circular plate portion. 9. The electric tool according to claim 7, wherein the outer periphery of the hollow cylinder portion has a holder portion protruding therefrom,the holder portion is provided with a fitting hole in which a support pin that rotatably supports the rolling body is fitted, andthe rolling body is fixed to the holder portion by the support pin. 10. The electric tool according to claim 1, wherein the urging unit is a coil spring. 11. The electric tool according to claim 1, wherein the operational member is operated to be slid in a direction of moving toward and away from the brake plate to allow the drive switch to be turned on and turned off, and the housing is provided with a guide that guides an operation of sliding the operational member.
Yasaka Yoshio (Gunma JPX) Motoi Ken (Ota JPX) Higashino Toshihiko (Gunma JPX) Okuie Takahiro (Daito JPX) Ogino Kazuyoshi (Kiryu JPX), Single motor magnetic recording/playback apparatus using a worm and worm wheel.
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