Patent attributes
A joint contains: a body, at least one locking block, at least one controller, and at least one resilient element. The body has an inlet segment, an outlet segment, and an air channel. The outlet segment has a connection orifice. Each locking block has a tooth and a driving portion. The tooth is controlled to move between a first position and a second position. Between the first position and the second position is defined a reverse driving travel path obliquely extending to the inlet segment. Each locking block also has a coupling shaft. The reverse driving travel path is arcuate, and the driving portion and the coupling shaft are on opposite sides of the tooth. Each resilient element urges the tooth to move to the first position and is pressed so that the tooth moves to the second position along the reverse driving travel path.
