Brakes – Vehicle – Railway
Reexamination Certificate
1999-11-11
2001-05-08
Oberleitner, Robert J. (Department: 3613)
Brakes
Vehicle
Railway
C188S041000, C104S259000, C092S088000
Reexamination Certificate
active
06227336
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention concerns a linear guide with a supporting body movable along a guide rail and a braking device, which has brake shoes acting on the guide rail and a piston, which is arranged movable in a pressure chamber by a pressure medium, whereby the braking device also has a spring acting on the piston.
Linear guides are used, among other things, in connection with machine tools with high speed drives, linear tables and laser processing machines, for example with linear drives. Such a linear guide is known from DE-GM 295 05 080 in which the braking or clamping force is applied by a pressure medium, for example, a hydraulic pressure medium such as oil. From safety technical perspectives, this linear guide is nonetheless unsuitable, because when an undesired pressure build up occurs in the pressure medium, a braking or clamping fast of the supporting body on the guide rail can no longer take place.
SUMMARY OF THE INVENTION
Underlying the invention is the object of creating a linear guide having a supporting body which, in emergency situations, such as a pressure medium failure, can be mechanically clamped and braked in a secure manner on the guide rail.
This objective is accomplished in accordance with the invention in that in the supporting body adjacent to the piston in the longitudinal direction of the guide rail a pressure plate is arranged which, in the state where the piston is not acted upon by the pressure medium, is pressed by the spring on one of the brake shoes which lie on the guide rail. Several pressure plates can also be used. For example, in the supporting body in the longitudinal direction of the guide rail on both sides next to the piston, a pressure plate acted upon by the spring can be arranged in any case. A conduit for the pressure medium can discharge in the area of the pressure chamber, in which the front face of the piston facing the brake shoe is situated.
In this way, one obtains a linear guide with a mechanical emergency brake. Especially for perpendicular table axes in connection with which the mechanical mass balance fails, or for rapidly moving horizontal table axes which are directly driven without a mechanical self-locking component, such as a jack screw, the braking function necessary from the perspective of safety is guaranteed in the event of a drop in pressure. When pressure energy is supplied, the brake opens, when pressure drops, it closes.
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Burch Melody M.
Ina Walzlager Schaeffler OHG
Oberleitner Robert J.
Volpe & Koenig P.C.
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