Pump jack hoisting apparatus including a safety railing for protecting workers from accidental falling
US6015028A · kind A · utility
Inventor
Key dates
| Filing date | May 14, 1997 |
| Grant date | Jan 18, 2000 |
| Priority date | — |
| Expiry date | May 14, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04G3/28
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A pump jack hoisting apparatus includes a safety railing for protecting workers from accidental falling. The apparatus includes a pair of laterally spaced pump jack poles each of which is associated with a respective pump jack. Each pump jack includes inner and outer support extensions for supporting thereon inner and outer walking platforms. A pair of generally L-shaped support frames is removably secured to the outer support extension of the respective pump jack. Each support frame includes a vertically extending arm and a horizontally extending brace. The brace includes a mounting member for engaging the outer arm of the respective pump jack. A plurality of generally L-shaped rail brackets are vertically spaced on the arms and include a top-open recess. A safety rail is removably positioned in the recess and extends between the pair of support frames.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.