Brakes – Wheel – Axially movable brake element or housing therefor
Reexamination Certificate
1999-02-22
2001-07-03
Oberleitner, Robert J. (Department: 3613)
Brakes
Wheel
Axially movable brake element or housing therefor
C192S083000, C192S090000
Reexamination Certificate
active
06253882
ABSTRACT:
BACKGROUND OF THE INVENTION
Hydraulic pressure devices are efficient at producing high torque from relatively compact devices. However, the ability of an unaided hydraulic motor alone to retain an associated shaft in a certain preset braking position is limited due primarily to volumetric fluid bypass. Therefore typically if hydraulic pressure devices are going to be utilized in applications necessitating braking forces on a shaft, a separate brake is utilized.
DESCRIPTION OF THE PRIOR ART
Hydraulic pressure devices with auxiliary brakes are well known in the art. Examples include U.S. Pat. No. 3,960,470, U.S. Pat. No. 3,536,230, U.S. Pat. No. 3,616,822, U.S. Pat. No. 4,981,423, U.S. Pat. No. 3,969,950 and ACT/US/83/01683.
These brakes, while serviceable, necessitate complicated housing parts, a separation of the brake from the hydraulic motor and/or auxiliary brake actuation lines. Each of these additional components adds to the complexity of the overall device, increasing the manufacturing, maintenance and other cost potentates to the brakes. In addition, frequently additional auxiliary components are necessary in order to provide for the desired braking function.
The present invention is designed to provide a simple hydraulic brake which is more adaptable than that of the prior art.
OBJECTS AND SUMMARY OF THE INVENTION
It is an object of the present invention to simplify the construction of hydraulic brakes.
It is another object of the present invention to increase the reliability of hydraulic brakes.
It is a further object of the present invention to strengthen hydraulic brakes.
It is still another object of the present invention to reduce the cost of hydraulic braking mechanisms and their controllers.
It is yet another object of the present invention to increase the adaptability of hydraulic motors.
REFERENCES:
patent: 3680666 (1972-08-01), Sommer
patent: 3946837 (1976-03-01), Houser
patent: 4090597 (1978-05-01), Folomin et al.
patent: 4358000 (1982-11-01), Cumming
patent: 4431091 (1984-02-01), Scibbe
patent: 4491202 (1985-01-01), Schmitt
patent: 4562902 (1986-01-01), Scibbe
patent: 5099964 (1992-03-01), Cunningham et al.
patent: 5333705 (1994-08-01), Lemaire et al.
Lightbody & Lucas
Oberleitner Robert J.
Siconolfi Robert A.
White Hydraulics Inc.
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