Patent attributes
An arrestor drives a valve-body. An air source supplies air into the valve-body to control a strike-controlling unit and bolt to reciprocally move. The valve-body has linking and arresting sections. The arresting section communicates with the linking section via a ventiduct. The arresting section is formed with a passage. An inner wall of the passage has a sloped annular groove. The annular groove communicates with the air source via an intake. A shaft and resilient member are accommodated in the passage. The shaft is reciprocally drivable by the arrestor and resilient member. Via a relief duct, the ventiduct communicates with a part of the passage where the resilient member is accommodated. The arresting section is formed with an escape hole via which the passage communicates with the outer side. The shaft is formed with a first annular groove corresponding to the annular groove of the passage.
