Pump jack handle assembly
US5975241A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 1998 |
| Grant date | Nov 2, 1999 |
| Priority date | — |
| Expiry date | Jan 14, 2018 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B27/00
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A handle assembly is provided for a pump jack having a shackle assembly with a rotatable pole-gripping rod for engaging and rolling along a pole surface. The handle assembly includes an extension of the pole-gripping rod, a coil spring disposed on the rod extension, a sleeve disposed around the rod extension and coil spring, and a bar fixed to the sleeve. A crank arm extends transversely of the rod extension which is pivotally connected to the arm at a first pivot location. The bar is pivotally connected to the arm at a second pivot location. The coil spring urges the sleeve into engagement with a locking member on the shackle assembly, such that the sleeve is prevented from rotating and the rod is unable to roll along the surface of the pole. A handle is mounted on the free end of the crank arm. The coil spring is further operative to hold arm in a position in which rotation thereof is blocked by a frame member of the jack, whereby to further prevent the rod from rotating and rolling along the surface of the pole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.