Pull-type pneumatic booster

摘要

A pull-type pneumatic booster comprises an elongated plunger received in a body for sliding movement along an axis thereof. A movable member is slidably received in the body and defines a low and a high pressure chamber therein. The high pressure chamber is controlled by a valve device to communicate with either of the low pressure chamber and a high pressure source in accordance with the movement of the plunger. One end portion of the plunger extends beyond the movable member into the low pressure chamber. The plunger has the other end portion of a tubular configuration. The front and rear end portions of the plunger are snugly fitted in and disposed in sliding contact with an inner surface of a tubular portion the movable member for guiding the movement of the plunger along the axis of the body. A load-transmitting means is received in the tubular rear end portion of the plunger for transmitting a reaction force applied to the output member to the input member via the plunger.