Brakes – Vehicle – Cart
Reexamination Certificate
2001-01-04
2002-07-16
Schwartz, Christopher P. (Department: 3613)
Brakes
Vehicle
Cart
C280S033994
Reexamination Certificate
active
06419053
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of braking mechanisms, and more specifically to a braking mechanism that can be used on or in connection with a wheeled cart or other device.
2. Description of the Related Art
One braking mechanism which is known in the prior art is described in U.S. Pat. No. 3,710,895. The device in the '895 patent describes a brake an retention system which can be used with food or beverage service cart of the type commonly found in commercial airliners. That patent taught the use of “feet” or other elements which could, when a handle was released, deploy and engage the floor surface. A pair of oppositely extended elements resist motion in both directions.
SUMMARY OF THE INVENTION
The present invention overcomes the limitations of the prior art by providing a braking mechanism which engages directly the wheels of the cart without requiring engagement with a carpet or other smooth surface floor. With the present invention, the braking mechanism consists of pairs of oppositely directed shoes that are spring loaded to engage a section of the wheel circumference. When engaged, any motion of the wheel is opposed by both a frictional and wedging contact with a brake shoe.
REFERENCES:
patent: 3486587 (1969-12-01), Malloy
patent: 4976447 (1990-12-01), Batson
patent: 5288089 (1994-02-01), Bowers et al.
patent: 5325938 (1994-07-01), King
patent: 5735367 (1998-04-01), Brubaker
patent: 6041894 (2000-03-01), Otterson
Martin-Vegue Mike J.
Winsor James N.
Arral Industries, Inc.
Kleinberg Marvin H.
KLEINBERG & LERNER LLP
Lerner Marshall A.
Schwartz Christopher P.
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