Multi-Bolt Clamshell Retainer for Wristpin on Rod Pump Unit
AssigneeTRC Services, Inc.
InventorsDarius J. Yakimchuk, Robert G. McDonald
Life of this patent
Estimating the term…
Abstract
An assembly connects a pitman arm to a slot in a crank arm of a pumping unit. A pin extends from the pitman arm disposed on a first side of the crank arm. The pin is disposed in the slot of the crank arm and has a distal end exposed on a second side of the crank arm. The distal end defines an external shouldered profile. A clamp is positioned on the distal end of the pin. The clamp has an internal shouldered profile, which is configured to engage the external shouldered profile on the pin. One or more spacers are disposed on the clamp and are configured to adjustably extend from the clamp toward the second side of the crank arm.
Claims27
An assembly connecting a pitman arm to a slot in a crank arm of a reciprocating pump unit, the crank arm having first and second sides, the pitman arm disposed on the first side, the assembly comprising:
- a pin extending from the pitman arm and positioned in the slot of the crank arm, a distal end of the pin extending from the second side of the crank arm, the distal end defining an external shouldered profile;
- a clamp clamped on the distal end of the pin, the clamp having a front face and having an internal shoulder profile, the front face positioned adjacent to the second side of the crank arm, the internal shouldered profile engaged with the external shouldered profile on distal end of the pin;
- and
- one or more spacers positioned adjacent to the front face of the clamp and the second side of the crank arm, the one or more spacer adjusting tensioning of the pin relative to the crank arm.
A kit to connect a pitman arm to a slot in a crank arm of a reciprocating pump unit, the crank arm having first and second sides, the pitman arm disposed on the first side of the crank arm, the kit comprising:
- a pin configured to extend from the pitman arm and configured to position in the slot of the crank arm, a distal end of the pin being configured to extend from the second side of the crank arm, the distal end defining an external shouldered profile;
- a clamp configured to clamp on the distal end of the pin, the clamp having a front face and having an internal shoulder profile, the front face configured to position adjacent to the second side of the crank arm, the internal shouldered profile being configured to engage the external shouldered profile on distal end of the pin;
- and
- one or more spacers configured to position between the front face of the clamp and the second side of the crank arm, the one or more spacers being configured to adjust tensioning of the pin relative to the crank arm.
A method to connect a pitman arm to a slot in a crank arm of a reciprocating pump unit, the method comprising:
- positioning a pin extending from the pitman arm on a first side of the crank arm into the slot in the crank arm;
- clamping a clamp on a distal end of the pin exposed on a second side of the crank arm by engaging an internal shouldered profile on the clamp to an external shouldered profile on the distal end of the pin;
- and
- tensioning the pin relative to the crank arm by selectively adjusting one or more spacers between the second side of the crank arm and the front face of the clamp.
Dependencies are inferred from the claim text.