Land vehicles – Skates – Runner type
Patent
1989-01-17
1990-11-27
Marmor, Charles A.
Land vehicles
Skates
Runner type
A63C 710
Patent
active
049730720
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a ski brake.
DESCRIPTION OF THE PRIOR ART
A ski brake of this kind is described in DE-OS 31 36 079. In the case of this ski brake, a displacement member is mounted on the base plate. When the actuating treadle is depressed, this displacement member causes the connecting spring to bend, thereby causing the free ends of the two wire brake mandrels to swivel in the direction of the vertical longitudinal medium plane of the ski brake. The disadvantage of this ski brake is that the force required to effect the swivelling motion is applied to the middle of the spring that connects the two wire brake mandrels. Consequently, this spring is subject to a high degree of stress, particularly because the angled ends of the wire brake mandrels are inserted into the spring are spaced a distance from the middle of the spring.
This then was the reason that the suggestion was made, in the case of another ski brake (s.A. 1483/86) that the connecting spring be provided with a U-shaped (in top view) deflection in its middle section. The crossbar of the deflection would be guided in or against a guide track in the base plate. When this is done, however, dimensioning of the U-shaped deflection is dependent on the dimensions and the material of the connecting spring. Finally, a ski brake is described in EP-Al 45 698, in which the end segments of the wire brake mandrels are angled and face each other. The connecting spring between the end segments is designed as a leaf spring and is firmly fastened to an actuating treadle. A consequence of this construction, however, is that the leaf spring is subject not only to bending stress, but additionally to torsional stress as well, when the ski brake is depressed on and the brake is swivelling upwards. In this case, the raising of the two wire brake arms is effected by means of a connecting rod, hinged to the treadle at one end and outfitted with a piston at its other end. This piston is guided in a cylindrical housing and is acted upon by a pressure spring. In the standby position, the leaf spring (which is deflected in the braking position) is swung around an angle guide, which causes the leaf spring to bend back and the ends of the wire brake arms carrying the brake blades to rotate inwards.
The object of the invention is to eliminate the disadvantages of the known constructions and to create a ski brake in which the working surfaces of the force that swivels the wire brake arms in are also in the vicinity of the angled ends of the wire brake arms, so that the connecting spring is subject to less bending stress from the direct application of the force. Furthermore, greater possibilities as to the selection of materials are to be provided to the designer.
SUMMARY OF THE INVENTION
Starting with a ski brake of the type described in the introduction, this object is achieved as a consequence of the present invention. By virtue of the fact that in the ski brake of the present invention the cylindrical sleeve of the connecting link extends all the way up to and over the angled end segments of the the wire brake arms, the flux of force coming from the extension is conducted to these ends, which relieves the load on the connecting spring.
Actually, it would be conceivable to provide the middle section of the sleeve with a recess. In practice, however, execution in accordance with the present invention has proven itself to be especially advantageous, particularly since the supporting surfaces of the connecting link can be made larger through this design.
Furthermore, the present invention ensures that the free end segments of the wire brake arms can swing into the standby position with reduced friction.
The present invention also ensures constant guiding of the connecting link at the base plate. When this is done, the supporting surface and the guide surfaces can be placed apart from each other, whereby the designer can more easily carry out those constructional measures that are necessary for retracting the free ends of the wir
REFERENCES:
patent: 4087113 (1978-05-01), Riedel
patent: 4173354 (1979-11-01), Murata
Freisinger Henry
Janisch Andreas
Leichtfried Friedrich
Luschnig Franz
Riegler Andreas
Culbreth Eric
Marmor Charles A.
TMC Corporation
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