Fluid-pressure and analogous brake systems – Releasing – Motor
Reexamination Certificate
1999-05-18
2001-01-09
Oberleiter, Robert (Department: 3613)
Fluid-pressure and analogous brake systems
Releasing
Motor
C303S003000, C060S404000
Reexamination Certificate
active
06170922
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a method and apparatus for releasing spring applied hydraulically released brakes when the source of pressurized hydraulic fluid fails.
2. Description of the Prior Art
Large work vehicles are increasingly using spring applied hydraulically released brakes. These brakes are always applied unless released by hydraulic pressure. Typically these brakes cannot be released unless the engine is running and the source of pressurized hydraulic fluid, a pump, is directing hydraulic fluid to the brakes. Sometimes the engines or the hydraulic pumps on these machines break down in remote locations where it is inconvenient to repair. This is especially true in forest fire applications where moving the vehicle is time critical. The repair person may need to tow the vehicle to a more suitable location to perform repairs. However as the brakes are in an applied mode it makes towing the vehicle difficult if not impossible. Therefore an external source of hydraulic pressure needs to be applied to the brakes to release the brakes before towing the vehicle.
Pressurized carbon dioxide cartridges are used in a number of applications. Simple hand held applicators are used to apply pressurized carbon dioxide gas to inflating tires, inflating air bladders on athletic shoes and skates and other applications. These hand held applicators may have variable flow valves to control the application of carbon dioxide gas.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a simple method and apparatus for releasing spring applied hydraulically released brakes when the vehicle's engine or the hydraulic pumps are inoperative.
It is a feature of this invention that a simple hand held mechanism for applying pressurized carbon dioxide or other compatible gases is used to release the brakes.
Spring applied hydraulically released brakes are always applied and are released by the application of hydraulic pressure. Typically a source of hydraulic pressure, a hydraulic pump, is coupled by a hydraulic line to the spring applied hydraulically released brakes. An intervening valve controlled by the brake foot pedals is hydraulically positioned between the pump and the brakes. If the foot pedal is depressed the brakes are applied by directing the pressurized hydraulic fluid from the brake chamber to tank.
In the present invention the hydraulic line is provided with a quick coupler coupling the hydraulic line to the pump. This quick coupler has a first coupling on the hydraulic line and a second coupling located between the first coupling and the pump. An auxiliary line is provided with an auxiliary coupler. This line is provided with a gas check valve which maybe in the form of a schraeder valve used on tires. If the engine or pump fails to operate, the operator can decouple the quick coupler and apply the first coupling to the auxiliary line coupler. The auxiliary line coupler and the second coupler are identical. A hand held carbon dioxide applicator of the type used to inflate tires and athletic shoes can then be attached to the schraeder valve and gas pressure can be applied through the auxiliary line to the hydraulic line where it pressurizes the hydraulic fluid and releases the brakes.
REFERENCES:
patent: 3854559 (1974-12-01), Talak et al.
patent: 3958454 (1976-05-01), Rasch
patent: 4123906 (1978-11-01), Durgan et al.
patent: 4199355 (1980-04-01), Kreitner
patent: 4451095 (1984-05-01), Chichester et al.
patent: 4576418 (1986-03-01), Holzinger et al.
patent: 4662412 (1987-05-01), Swallert
patent: 5203616 (1993-04-01), Johnson
patent: 5357800 (1994-10-01), Reuter et al.
patent: 5984425 (1999-11-01), Orzal
Fjellman Henry Richard
Vannorsdel Randy Scott
Deere & Company
Oberleiter Robert
Pezzlo Ben
LandOfFree
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