Fork lift truck with balance weight using batteries as power sou

Details Fork lift truck with balance weight using batteries as power sou Fork lift truck with balance weight using batteries as power sou

1977-04-29

1979-02-27

Schaefer, Robert K.

Electricity: motive power systems

Battery-fed motor systems

318340, 318358, 318359, 318376, 318409, 318428, 318497, 318269, 318533, H02P 500

Patent

active

041421353

ABSTRACT:
A speed control device for use in a battery-powered vehicle wherein a shunt field current in a compound electric motor for driving the vehicle having a reactor connected in series therewith can be selectively controlled by using a variable resistor included in the circuitry and operatively interconnected to an accelerator pedal so that the resistance to the shunt field current may be changed accordingly to the extent of stepping-down on the pedal by the operator. The speed control device also features that a part of the vehicle's body structure of a ferro-magnetic material is used in combination as a core of the reactor so as to form a complete magnetic circuit for the reactor.

REFERENCES:
patent: 1954770 (1934-04-01), Prantl
patent: 2911053 (1959-11-01), Ayerrs et al.
patent: 3716768 (1973-02-01), Mason
patent: 3923116 (1975-12-01), Thompson et al.
patent: 3938013 (1976-02-01), Seilly et al.
patent: 3987349 (1976-10-01), Shibata et al.

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