Land vehicles – Wheeled – Occupant propelled type
Patent
1999-03-02
2000-10-17
Mar, Michael
Land vehicles
Wheeled
Occupant propelled type
2803392, 2803391, 188 31, 16 35R, 104242, B60B 3302
Patent
active
061319368
ABSTRACT:
In the front wheel assembly of a luggage or shopping cart, a sensor wheel is supported by a wheel bracket between a pair of caster wheels so as to be rotatable around a common horizontal wheel shaft and moveable downward from a neutral position coaxial with the caster wheels. Thus, even when the cart is tilted sideways, one of the caster wheels always support the load of the cart, and serves as a center of pivotal movement of the front wheel assembly which allows the sensor wheel to be safely lifted out of the slot in the floor. Therefore, the sensor wheel is prevented from being wedged in the slot, and would not be damaged substantially under any circumstances. Additionally, a first locking arrangement allows the cart to be stationary on the conveyor surface, and a second locking arrangement allows the front wheel to remain in the straight ahead position even when the front wheel assembly hangs from an edge of a step of an escalator. These features of the present invention allow the cart to be maneuvered freely on a stationary smooth surface, and to stay stationary in a stable fashion on a moving slotted surface.
REFERENCES:
patent: 3040370 (1962-06-01), Ford
patent: 3265157 (1966-08-01), Rissler
patent: 3305064 (1967-02-01), Mullis et al.
patent: 3318432 (1967-05-01), Mullis et al.
patent: 3405783 (1968-10-01), Clark et al.
patent: 4327462 (1982-05-01), Eggleston
patent: 4747180 (1988-05-01), Screen
patent: 4807328 (1989-02-01), Hezel
Eguchi Yasuhiko
Fukutake Heiji
Exedy Corporation
Mar Michael
Phan Hau
LandOfFree
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