Brake and actuator assembly

Details Brake and actuator assembly Brake and actuator assembly

1998-03-25

2001-04-24

Oberleitner, Robert J (Department: 3613)

Brakes

Wheel

Axially movable brake element or housing therefor

C092S168000, C277S549000

Reexamination Certificate

active

06220401

ABSTRACT:

This invention relates to a brake and actuator assembly in which the actuator, typically of the air-operated type, is carried on the brake housing, and a force transmission element of the actuator extends through an opening in the housing and cooperates with an actuating member of the brake, usually in the form of a pivoted lever, a seal being provided between the housing and the force transmission element and serving to minimise the ingress of foreign material into the housing.
A problem with some conventional seals in assemblies of the aforesaid kind is that failure of the seal in use may result in air entering the brake housing. Moreover, when the actuator is removed from the housing, as for servicing for example, sealing of the housing opening from the surrounding atmosphere can be compromised, resulting in contamination of the housing by moisture, dirt or other foreign material.
An object of the invention is to provide an improved brake and actuator assembly in which the aforesaid problems are minimised or avoided, as well as an improved seal to form part of the aforesaid assembly in use.
According to the present invention, a brake and actuator assembly comprises a brake housing, an actuator device mounted on the housing, the actuator having a force transmission element extending through an opening in the housing and cooperating with an actuating member of the brake within the housing, the assembly incorporating a seal carried by the housing in a position such that it seals around both the opening and the force transmission element whilst permitting the latter to move in a direction longitudinally of the element for brake actuation, the seal having a portion arranged for sealing engagement with the brake actuating member at least when the member is in its inoperative rest position.
Preferably, the seal is such that it also permits the element limited angular movement whilst continuing to seal around the opening and element.
The seal may conveniently have a relatively stiff inner rim defining an opening which receives the transmission element in sliding sealing relationship, and a relatively stiff outer rim which seals around the housing opening, the inner and outer rims being interconnected by one or more relatively flexible portions which permit the element limited angular movement while the seal continues to seal around the opening and element.


REFERENCES:
patent: 3395584 (1968-08-01), Cox et al.
patent: 4116115 (1978-09-01), Gross et al.
patent: 4222310 (1980-09-01), Garrett et al.
patent: 5392691 (1995-02-01), Schultz
patent: 0 012 024 (1980-06-01), None
patent: 0 740 085 (1996-10-01), None

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