Pump jack

Details Pump jack Pump jack

1981-11-02

1984-07-24

Staab, Lawrence J.

Machine element or mechanism

Mechanical movements

Rotary to or from reciprocating or oscillating

74 37, F16H 2132, F16H 1906

Patent

active

044611870

ABSTRACT:
A pump jack comprises a rocker arm one end of which is fixed to the upper end of a sucker rod. The other limb of the rocker arm has rigidly affixed thereto a downwardly-extending drive support member and a large driven pinion is eccentrically and rotatably mounted at the lower end of this drive support member. The driven pinion is engaged by a chain, which also passes around a driving pinion fixed to the base of the pump jack. This drive arrangement reduces the acceleration and shock loadings imposed upon the sucker rod at the beginning of its upstroke and reduces the size and cost of the gearbox necessary to connect a prime mover to the driving pinion.

REFERENCES:
patent: 1592391 (1926-07-01), Stevenson
patent: 1699675 (1929-01-01), Reschke
patent: 1758730 (1930-05-01), Winters
patent: 2488124 (1949-11-01), Hawley et al.
patent: 2526561 (1950-10-01), Keltner
patent: 3018865 (1962-01-01), Blackburn
patent: 3310988 (1967-03-01), Gault
patent: 4121475 (1978-10-01), McIlwain

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