LOCK MECHANISM OF ROTARY SEAT

PROBLEM TO BE SOLVED: To provide a lock mechanism of a rotary seat for surely locking a stopper member on a locking groove, even when performing rotary operation at a high speed. SOLUTION: A plate member 20 for installing the stopper member 41 is arranged in a lower part of the rotary seat, and a guide groove 31 is formed in a base member 30 fixedly arranged in a base part of an industrial vehicle, and the plate member 20 is rotatably supported to the base member 30. The locking groove 31b is formed in an intermediate part of the guide groove 31 so that its groove width becomes narrow for separating from the guide groove 31, and the stopper member 41 is energized in the locking direction to the locking groove 31b by a coil spring 43. The stopper member 41 is guided along the guide groove 31, and when the stopper member 41 intrudes in the locking groove 31b by moving in at least one direction of the guide direction along the guide groove 31, the plate member 30 energizes the stopper member 41 in the locking direction to the locking groove 31b. COPYRIGHT: (C)2008,JPO&INPIT