Expansible chamber devices – Relatively movable working members – First working member moves second coaxial working member...
Patent
1995-12-29
1997-04-29
Denion, Thomas E.
Expansible chamber devices
Relatively movable working members
First working member moves second coaxial working member...
92130A, F01B 700
Patent
active
056238630
ABSTRACT:
A spring brake actuator includes a unique release bolt having two distinct threaded portions. A first-threaded portion is received in a threaded insert in the brake actuator outer housing. The second-threaded portion has its threads extending in an opposed direction to the first-threaded portion and is threadably received within a nut caging member. The nut is received in a bore in the push rod and constrained against rotation relative to the push rod. The nut moves axially within the push rod. The second-threaded portion rotates with the entire release bolt. When the release bolt is rotated, the first-threaded portion moves outwardly of the threaded insert, and the nut moves with the release bolt. At the same time, the second-threaded portion is rotating within the nut, and the nut moves axially relative to the second-threaded portion. The nut is moving axially due to two actions of the release bolt. Thus, movement of the release bolt outwardly of the brake actuator results in amplified movement of the caging member. In this way, the release bolt need not extend outwardly relative to the spring brake actuator housing as far as is the case with the prior art.
REFERENCES:
patent: 3131609 (1964-05-01), Dobrikin et al.
Denion Thomas E.
Indian Head Industries Inc.
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