Brakes – Vehicle – Cart
Patent
1995-10-17
1998-03-24
Graham, Matthew C.
Brakes
Vehicle
Cart
280 33994, B62B 908
Patent
active
057302553
ABSTRACT:
The present invention relates to a wheeled carriage, particularly a walker, including a load-bearing frame having a plurality of wheels rotatably carried thereby for support and mobility thereof. The frame carries a hydraulic fluid reservoir, and a pair of pumps having inlet and outlet ports. The pumps draw fluid through their respective inlet ports from the reservoir and return fluid through their respective outlet ports to the reservoir. Conduit is also carried by the frame for fluid communication between the reservoir and the inlet and outlet ports of the pumps. The wheels are respectively connected to each of the pumps for operating the pumps in response to the rotation of the wheels. The frame further carries a valve in the conduit that is adapted to be opened or closed by the hand strength of the user. The closed position of the valve prevents movement of the hydraulic fluid from the outlet ports of the pumps to the reservoir whereby the connected wheels are prevented from rotating.
REFERENCES:
patent: 1965459 (1934-07-01), Fischer
patent: 4387908 (1983-06-01), Kroger et al.
patent: 4392663 (1983-07-01), Forslund
patent: 5370408 (1994-12-01), Eagan
Kent's Mechanical Engineers' Handbook, "External Gear Pump," p. 13-09, 1950.
Enrichments' "Aid Through Daily Living" catalog, pp. 154-156, date unknown but believed to be Jan. 1996.
Rubbermaid Health Care Products catalog, Carex walkers and accessories, pp. MA1, MA4-MA6, date unknown but believed to be Jan. 1996.
Winnie Walker Company, brochure entitled "Introducing Our Family of Wheeled Walkers," date unknown.
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