Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
1999-05-18
2001-05-01
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
C060S571000
Reexamination Certificate
active
06223533
ABSTRACT:
The invention concerns a pressurized fluid device as specified in the introduction of claim
1
.
A device of the above-mentioned type is disclosed in U.S. Pat. No. 4,543,856, which is used in an automotive transmission shifting mechanism for effecting engagement of the respective gears of a gear box with a force that varies in accordance with the gear selected. The gearbox can be operated by means of a gear lever which influences the piston of a double acting, master cylinder with a pressure fluid.
With different gearboxes there may be a need for different forces and power paths during the gear shift. This may involve a need for proportional valves with different characteristics and thereby possibly of a different size and design. In order to cover the varying requirements, many different proportional valves therefore have to be manufactured, thus reducing the size of the series for production of the valves and increasing the price thereof. Furthermore, such valves comprise many components and components with fine dimensional tolerances, thus further increasing the production costs, the storage costs etc. and thereby the price.
The object of the device according to the invention is to provide an inexpensive pressurized fluid device of the type mentioned in the introduction which is not encumbered by the above-mentioned disadvantages.
The characteristics of the pressurized fluid device according to the invention are presented in the characteristic features indicated in the claims.
REFERENCES:
patent: 4543856 (1985-10-01), Klatt
patent: 4635439 (1987-01-01), Wible
patent: 4813339 (1989-03-01), Uno et al.
patent: 5017094 (1991-05-01), Graf et al.
patent: 0 703 389 (1996-03-01), None
patent: WO 91/19108 (1991-12-01), None
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Kongsberg Automotive ASA
Lazo Thomas E.
Look Edward K.
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