Patent ID: 8100047
Filing Date: 2012-01-24
Classification: B60T

Abstract:
1. An air-operated spring brake actuator for applying parking brakes of a vehicle comprising: a housing including a first end wall, a second end wall opposing the first end wall, and a side wall extending between the first and second end walls, the first end wall, the second end wall and the side walls together defining an cavity therein; a diaphragm spanning the cavity, and dividing the cavity into a spring chamber located between the diaphragm and the first end wall, and a pressure chamber located between the diaphragm and the second end wall, the diaphragm being in a first position when the pressure chamber is pressurized with fluid and in a second position when the pressure chamber is exhausted; and a pushrod, wherein when the diaphragm is in the second position the pushrod is positioned to apply the parking brake, and when the diaphragm is in the first position said pushrod is positioned to release the parking brake; one or more sealing elements; wherein said diaphragm has a hole though which said pushrod passes, and wherein said one or more sealing elements seal the pushrod to the diaphragm.