Safety brake arrangement in a brake actuator
AssigneeSab Wabco AB
InventorLars Severinsson
Life of this patent
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Abstract
A brake actuator for delivering a brake force through a brake block or br pad to a wheel or disc to be braked comprises in a housing (1) a service brake arrangement (3, 5). The actuator also comprises a safety brake arrangement (4, 9) including at least one powerful spring (9), acting in the brake application direction, means for tensioning the spring by the reaction force at a service brake application, and mechanical means (11, 12, 13) for locking the spring to the housing in a tension state. These locking means can be released at will for accomplishing a safety brake application.
Claims7
A brake actuator for delivering a brake force through a braking element to a vehicle being braked, comprising in combination:
- a housing, a service brake arrangement within said housing, an associated safety brake arrangement mounted within the housing operable from at least one powerful safety brake spring for actuating the safety brake arrangement, a means for compressing the safety brake spring during a service brake application, a mechanical locking means for locking the safety brake spring to the housing in a non-braking compressed state, a safety brake spring unlocking means for releasing at will the mechanical locking means from the compressed state to reside in a decompressed state thereby accomplishing a safety brake application in response to decompression of said safety brake spring, and electric motor driven means for actuating the unlocking means thereby to apply the service brake.
Dependencies are inferred from the claim text.