| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent stagging by smoothly sliding a piston of a conduit switching device such as a suction button. <P>SOLUTION: A piston 51 is movably inserted into a cylinder 50. An operation cap 41 is attached to a cap attaching end 51B of the piston 51. A coil spring 48 is disposed between the operation cap 41 and the cylinder cap 52. O-rings 65A-65D are accommodated in O-ring accommodating grooves 61-64 of the piston 51. Rolling regions for moving the O-rings 65A-65D by rolling are provided in the O-ring accommodating grooves 61-64. The rolling length of the rolling regions are made to be different for each of the O-ring accommodating grooves 61-64. This configuration can shift the time when sliding resistance is generated in the O-rings 65A-65D after finishing of rolling, and the frictional resistance can be reduced as much. Since the sliding resistance acts on piston 51 simultaneously, stagging can be prevented in restoration of the piston 51. <P>COPYRIGHT: (C)2013,JPO&INPIT |
