| 摘要 |
A pneumatic door-closure apparatus comprising an elongated cylindrical housing in which an integrally formed rod and piston are slidably biased, the rod having a free end that extends outwardly therefrom and including a plurality of transversely disposed grooves to receive an adjustable-retainer clamp, so as to regulate the inward longitudinal movement of the piston. The rear closed end of the housing is provided with an air-valve regulator to control the speed of the inward movement of the piston, the piston including an air-flow control to allow air to pass freely from the spring-biased side of the piston to the compressed-air side, when the rod is extended outwardly from the housing. A two-way-mounting bracket is further provided and arranged to be attached at the rear closed end of the cylindrical housing for right or left hand mounting of the apparatus.
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