Patent ID: 8127898
Filing Date: 2012-03-06
Classification: E05F,E05Y,F16D,H02K,Y10T

Abstract:
1. A brake device provided between a drive shaft and a driven shaft arranged coaxially with the drive shaft, the device comprising: a first rotor provided in a manner rotatable integrally with the drive shaft and having a plurality of engagement portions; a second rotor arranged in a manner rotatable integrally with the driven shaft and having a plurality of engagement portions wherein the engagement portions of the first rotor and the engagement options of the second rotor are engaged with each other in a rotational direction of the first and second rotors and causes engagement between the first rotor and the second rotor in such a manner as to allow transmission of rotation; a braking mechanism including a movable friction member rotatable integrally with the second rotor, a fixed friction portion, and an urging member that urges the movable friction member toward the fixed friction portion, wherein the movable friction member is movable between an engagement position at which the movable friction member contacts and is engaged with the fixed friction portion and a non-engagement position at which the movable friction member is separated from the fixed friction portion; and a cam mechanism that moves the movable friction member between the engagement position and the non-engagement position, wherein, when rotational force is provided from the drive shaft to the first rotor, the cam mechanism moves the movable friction member from the engagement position to the non-engagement position so as to allow transmission of the rotation of the drive shaft to the driven shaft through the first rotor and the second rotor, and wherein, when the rotational force is provided from the driven shaft to the second rotor, the cam mechanism maintains the movable friction member at the engagement position so as to restrict the rotation of the driven shaft, wherein the cam mechanism is provided independently from the engagement portions.