Elevator – industrial lift truck – or stationary lift for vehicle – Stationary lift for roadway vehicle or required component... – Having specific drive means for support
Patent
1987-02-25
1988-06-21
Rolla, Joseph J.
Elevator, industrial lift truck, or stationary lift for vehicle
Stationary lift for roadway vehicle or required component...
Having specific drive means for support
2502221, 356400, B66B 920
Patent
active
047519835
ABSTRACT:
Sensors associated with load carrying members are inaccurate, incorrectly sense the position of the load, and are subject to impact forces which cause premature sensor failure. A load lifting device having a load carrying member and first and second sensors and first and second reflectors on the load carrying member is provided. The sensors are mounted on a first end portion of load carrying member at longitudinally spaced apart locations and the first and second reflectors are mounted on a second end portion of the load carrying member at spaced apart locations on the second end portion. The first sensor delivers a first signal to the first reflector and receives a reflection of the first signal, and the second sensor delivers a second signal to the second reflector and receives a reflection of the first signal from the second reflector. The problems associated with inaccurate sensing of load position, damage to the sensors by impact, and premature wear due to cyclical forces are substantially reduced. The load lifting device is particularly suited for use on a material handling vehicle of the automatic guided vehicle type.
REFERENCES:
patent: 3672470 (1972-06-01), Ohntrup et al.
patent: 4212375 (1980-07-01), Peterson et al.
patent: 4294543 (1981-10-01), Apple et al.
patent: 4564085 (1986-01-01), Melocik et al.
Leskovec Edward V.
Schwehr Richard A.
Caterpillar Industrial Inc.
Hickman Alan J.
Noland Kenneth
Rolla Joseph J.
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