| 主权项 |
1. A cylinder apparatus including an annular piston (10) inserted into a housing (1) ascendably and descendably, an output rod (15) which is inserted into a cylindrical hole (10a) of the piston (10) and is inserted into an upper wall (2) of the housing (1), and a driving chamber (11) which is arranged above the piston (10) and where pressurized fluid for driving is supplied and discharged, the output rod (15) being configured to rotate in response to ascent and descent of the piston (10) relative to the output rod (15), the cylinder apparatus comprising:
a descent-detecting first detection valve (31) and an ascent-detecting second detection valve (32) which are arranged outside a periphery of the output rod (15) and in the upper wall (2), to be circumferentially spaced apart from each other at a predetermined interval; a first operated portion (49) and a second operated portion (79) respectively provided on the first detection valve (31) and the second detection valve (32) in the vicinity of the driving chamber (11), the first operated portion (49) being arranged to be movable in response to movement of one of two members of the output rod (15) and the piston (10), the second operated portion (79) being arranged to be movable in response to movement of the other of the two members; and a first supply passage (B1) and a second supply passage (B2) through which pressurized air for detection is supplied to respective inlets (31a) (32a) of the first detection valve (31) and the second detection valve (32), respectively. |
