Drive and control mechanism for electrically operated reciprocat

Details Drive and control mechanism for electrically operated reciprocat Drive and control mechanism for electrically operated reciprocat

1974-12-06

1976-11-02

Schaefer, Robert K.

Electricity: motive power systems

Motor-reversing

Periodic- or intermittent-reversing

H02P 720

Patent

active

039899934

ABSTRACT:
A drive and control mechanism for an electrically operated reciprocating apparatus, intended especially for a long-stroke well-pumping apparatus. The mechanism automatically controls the direction of travel of the apparatus and effects reversals at the ends of each stroke. On start-up the apparatus always travels in a direction toward its farther limit of travel. Control is effected without series of sequentially operating relays which can shut down the apparatus unnecessarily in the event any one relay drops out accidentally, as can result from a voltage drop. The circuit includes protective means for shutting down the apparatus immediately in the event certain malfunctions occur, for example, if the parts travel beyond proper limits, or if the apparatus commences to operate at excessive speed, or if a motor overheats.

REFERENCES:
patent: 1971865 (1934-08-01), Matthews
patent: 2312178 (1943-02-01), Levison et al.
patent: 2377743 (1945-06-01), Arutunoff
patent: 2913651 (1959-11-01), Smith et al.
patent: 3345950 (1967-10-01), Bender

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