Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1983-04-25
1985-06-04
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74522, 74 56, 254 27R, F16H 2132, G05G 104, G05G 100, E21B 1900
Patent
active
045206830
ABSTRACT:
The pump jack is of conventional API front-mounted geometry Class III configuration, but is provided with an angularly disposed walking beam, so as to be able to pump a slant rod string. To incorporate versatility into the unit so that a single model can be used with different wells having different angularities, there is provided: means for altering the effective length of the Pitman arms (so that the angularity of the walking beam is changed, which permits the unit to be used with a rod string having a different slant); means for bringing the counterweight into phase with the well load; and means for altering the stroke length.
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Haverstock Wayne
Krywchuk David
Masak Peter
Andrews Stephen B.
Herrmann Allan D.
Johnson E. P.
Universal Industries Ltd.
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