Long stroke pumping unit

Details Long stroke pumping unit Long stroke pumping unit

1985-03-19

1987-05-19

Staab, Lawrence

Machine element or mechanism

Mechanical movements

Rotary to or from reciprocating or oscillating

74 892, F04B 4702

Patent

active

046657614

ABSTRACT:
A long stroke pumping unit comprising a tower mounted on a base and a counterweight-polished rod system which bestrides a top wheel mounted on the top of said tower, employs an electric motor as its prime mover. The motor rotates in a fixed direction, and through a crank mechanism the rotation of electric motor is turned into a linear reciprocating movement which is in an approximately simple harmonic fashion, and then, by means consisting of fixed pulley blocks and a travelling pulley block assembly the stroke of said reciprocating movement is multiplied and transmitted to the counterweight-polished rod system. The stroke can be easily changed by changing the effective length of the crank, also, it can be selected within a great extent by changing the number of pulleys engaged in operation.

REFERENCES:
patent: 2502057 (1950-03-01), Mitchell
patent: 2681623 (1954-06-01), Kane
patent: 2683424 (1954-07-01), Kane
patent: 3153387 (1964-10-01), Sadouet
patent: 4121471 (1978-10-01), Chancellor
patent: 4161137 (1979-07-01), Gaddy
patent: 4275609 (1981-06-01), DeLaney
patent: 4404870 (1983-09-01), Atumaru
patent: 4483208 (1984-11-01), Parker
patent: 4519262 (1985-05-01), Le et al.

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