Pneumatically controlled load compensating brake system
First Claim
1. A pneumatically controlled load compensating brake system for a wheel truck which includes a bolster resiliently supported on a pair of side frames, said frames being mounted on a spaced pair of axles having wheels at each end, said brake system comprising:
- a pair of brake beams extending across the wheel truck adjacent respective ones of the axles with brake shoes at each end for engaging the wheels, expandable pneumatic means supported on said bolster, a multiple lever system inter-connecting said expandable pneumatic means and said brake beams and operable to move said beams relative to each other to press said brake shoes against said wheels upon pressurization of said expandable pneumatic means, and an empty and load valve responsive to the vertical position of said bolster relative to said side frames connected to said pneumatic means, wherein said empty and load valve is operable to change pressure to said pneumatic means upon a change in load on said bolster.
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Accused Products
Abstract
A pneumatically controlled load compensating brake system for a wheel truck is provided. The wheel truck includes a bolster resiliently supported on a pair of side frames mounted on a spaced pair of axles having wheels at each end. The brake system includes a pair of brake beams extending across the wheel truck adjacent the axles with brake shoes at each end for engaging the wheels. An expandable pneumatic means is supported on the bolster and is inter-connected to the brake beams by a multiple lever system. The lever system is operable to move the beams relative to each other to press the brake shoes against the wheels upon pressurization of the expandable pneumatic means by an empty and load valve. The empty and load valve senses a change in load on the bolster and is operable to change pressure to the pneumatic means in response thereto.
15 Citations
12 Claims
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1. A pneumatically controlled load compensating brake system for a wheel truck which includes a bolster resiliently supported on a pair of side frames, said frames being mounted on a spaced pair of axles having wheels at each end, said brake system comprising:
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a pair of brake beams extending across the wheel truck adjacent respective ones of the axles with brake shoes at each end for engaging the wheels, expandable pneumatic means supported on said bolster, a multiple lever system inter-connecting said expandable pneumatic means and said brake beams and operable to move said beams relative to each other to press said brake shoes against said wheels upon pressurization of said expandable pneumatic means, and an empty and load valve responsive to the vertical position of said bolster relative to said side frames connected to said pneumatic means, wherein said empty and load valve is operable to change pressure to said pneumatic means upon a change in load on said bolster. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification