Machine element or mechanism – Control lever and linkage systems – Hand operated
Patent
1992-09-30
1994-05-17
Luong, Vinh T.
Machine element or mechanism
Control lever and linkage systems
Hand operated
745024, 745005, F16C 110
Patent
active
053117930
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is related to a brake cable fixing device for a parking brake (see e.g. Brake Handbook, 9th edition 1985; Bartsch Verlag; page 135).
2. Description of the Related Art
Duo-servo parking brakes are known which are actuated mechanically by means of a cable control. This type of brake is used in vehicles which are equipped with disc brakes at all wheels. It is accommodated in the hat section of the rear wheel disc brake, the brake shoes being urged against a parking brake drum by an expanding lock. The expanding lock is composed of a pressure bracket and an actuating lever which both engaged with a hinge pin. In this configuration, the brake cable is pinned by an ear in the actuating lever. In addition to the hazards presented by the cable which hangs out, the mounting procedure of inserting the brake cable is cumbersome since the cable must be passed through the steering knuckle via the protective bushing into the expanding lock. This procedure is even more difficult if the brake drum has already been installed.
It is therefore the object of the present invention to create a fixing device for a brake cable in which an easy, uncomplicated insertion of the brake cable into the expanding lock of a brake drum is ensured free of the risk of accidents, without necessitating the use of tools.
SUMMARY OF THE INVENTION
In the brake of the aforementioned kind this object is achieved by creating a convergent funnel shaped entry space guiding insertion of the cable defined in part by a securing element comprised of an elastic leg inclined towards the fork legs of an actuating lever to create said convergent entry space.
The inside of the forked legs of a pressure bracket preferably extend along either side of the entry space, providing a side confinement. The elastic leg is able to be deflected to allow a cable end nipple fixed on the cable end to pass by the elastic leg and maneuvered between the fork legs of the actuating lever to secure the cable.
The elastic leg can either be of a width such as to be urged against the outside of both the actuating lever fork legs, or of a narrower width and shorter length so as to pass between the actuating lever fork legs.
The elastic leg is preferably provided by a spring clasp, with the elastic leg comprising one leg of the spring, joined to another spring leg at a vertex.
The other spring leg acts to provide a mount for the securing element, an angled end retained in a slot in the fork end wall of the pressure bracket, or by a snap in fit of an S-shaped end of the other spring leg to the end wall.
The cable end nipple preferably is of tapering shape to further assist insertion and to avoid catching on the fork edges during installation.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a front view of an expanding lock of a duo-servo parking brake and fragmentary view of the associated brake shoe operators, showing in phantom the cable end nipple and brake cable being inserted, with the final position of the cable end nipple and cable in the forked seat of the actuating lever shown in solid and broken lines;
FIG. 2 is an enlarged cross-sectional view taken along the line 2--2 in FIG. 1 as viewed in the direction of the arrows;
FIG. 3 is a front view of an alternate form of the securing element incorporated in the cable fixing device according to the present invention;
FIG. 4 is a front view of another embodiment of the invention; and
FIG. 5 is a front view of yet another embodiment of the invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The expanding lock of the duo-servo parking brake is composed of a pressure bracket I and of an actuating lever 2 which both are engaged with a hinge pin 3. In this configuration, the pressure bracket 1 and the actuating lever 2 are connected with brake shoes 5 through spacing levers 4 which are respectively in abutment with an actuating end portion 2A of the lever 2 and the end actuating portion 19 of pressure bracket 1 opposite the pin 3.
As seen in FIG. 2, the pressu
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PCT International Preliminary Examination Report dated Aug. 11, 1992-P. Asseeff.
Musolf Jurgen
Panek Claus-Peter
Post Wulf
Wohlmann Uwe
Alfred Teves GmbH
Lewis J. Gordon
Luong Vinh T.
Seitter Robert P.
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