| US 7,614,446 B2 | ||
| Swivelling device for a downhole rod pump | ||
| Lloyd Walker, Swift Current (Canada) | ||
| Assigned to Topco Oilsite Products Ltd., Calgary (Canada) | ||
| Filed on May 03, 2007, as Appl. No. 11/797,501. | ||
| Prior Publication US 2007/0256866 A1, Nov. 08, 2007 | ||
| Int. Cl. E21B 19/00 (2006.01) | ||
| U.S. Cl. 166—75.14 [166/85.1] | 11 Claims |
| 1. A swivelling device for connection to a drive string, the device comprising:
a housing having an opening in a bottom end;
a shaft mounted within the housing and defining an axis, the shaft rotatably mounted within the housing and fixed longitudinally
relative to the housing, a bottom end of the shaft passing through the opening in the bottom end of the housing and connectable
to a drive string with no point of articulation between the shaft and the drive string;
a support frame connectable to an external support, the support frame moveably connected to the housing such that the housing
can be longitudinally displaced, along the axis, away from the support frame and such that the support frame and housing are
rotationally fixed with respect to each other to prevent relative rotation about the axis; and
at least one biasing mechanism biasing the housing towards the support frame.
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