Machine element or mechanism – Control lever and linkage systems – Hand operated
Patent
1996-02-20
1997-09-30
Lorence, Richard M.
Machine element or mechanism
Control lever and linkage systems
Hand operated
188 2D, F16C 112, F16D 6522
Patent
active
056716397
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a mechanical operating mechanism, in particular for motor vehicle brakes, comprising a lever which is mounted on a housing to pivot about a pivot axis and is provided with a slot and an abutment, and comprising a cable which is placed in position in the slot and has a butt end which is supported against the abutment, such that the lever can be caused to pivot by tensioning the cable.
Mechanical operating mechanisms of this kind are installed, for example, for parking brake systems in motor vehicles. A disc brake, which is actuated hydraulically for service brake systems and actuated by an operating mechanism of the kind mentioned above for parking brake systems, is known from EP 0 403 635. The brake comprises a housing, in which is provided an hydraulic cylinder and on which is supported a shaft which has a common axis with the cylinder. A lever for parking braking is attached to one shaft end which projects out of the housing, said lever comprising an end section which is spaced away from the shaft and is provided with a limb which projects radially in an outward direction and with a limb which is bent backward. A slot is provided between these two limbs, into which slot a cable of a Bowden mechanism can be placed. The two limbs have lateral faces adjacent to the slot and the lateral faces jointly form an abutment for a butt end of the cable. Said abutment is shaped such that it provides a reliable support for the butt end, when and while the cable is at least partially tensioned. When an operating mechanism of this kind is installed in a motor vehicle, the Bowden mechanism is adjusted such that the cable is at least slightly tensioned in the non-operating state, such that lost motion is substantially prevented when the brake is actuated mechanically.
Such operating mechanisms are usually assembled with the unit at the site of manufacture of the unit which is to be operated, for example a motor vehicle brake, and are delivered, together with said unit, to the place of installation, for example a conveyor belt in the plant of a motor vehicle manufacturer, where that end region of the Bowden mechanism which is spaced away from the brake, or the like, is connected to an associated operating member, for example a hand-brake lever, a balance-beam-like intermediate member usually being arranged between said hand-brake lever and two Bowden mechanisms for, in each case, one rear-wheel brake, which intermediate member ensures an equal distribution of force to the two brakes. It is possible, during the assembling procedures which must be carried out in this region, that, instead of a pulling force, a pushing force is temporarily exerted on a cable of an operating mechanism of the kind mentioned. If, in that case, the cable is displaced in the associated Bowden mechanism, it is possible for that end which is associated with the brake, or the like, to move away from the abutment such that, during the subsequent tensioning of the cable, the butt end slides out of the associated slot and does not return to the abutment. It is then necessary for the cable to be loosened, to place it again in position in the slot of the lever, and to ensure that the butt end rests against the abutment, prior to a renewed tensioning of the cable from the other end which is adjacent to the brake rod or the like.
The invention is based on the object of simplifying the assembly of mechanical operating mechanisms of the kind mentioned at the outset, in particular their installation in a motor vehicle.
According to the invention, this object is met in that the lever is provided with a projection which, in extension of the cable and forming an intermediate space, is disposed opposite the abutment, and the end is accommodated in the intermediate space and is supported against the projection for the transmission of the pushing force of the cable.
As a result, it is ensured that the cable can no longer be detached unintentionally from the lever. Nonetheless, if required, the cable is readily removed in that it is bent in a
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Madzgalla Frank
Wagner Lothar
Lorence Richard M.
Lucas Industries Public Limited Company
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