Oil well sucker rod safety block
US4483564A · kind A · utility
11Cited by
12References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1982 |
| Grant date | Nov 20, 1984 |
| Priority date | — |
| Expiry date | Aug 2, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C1/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A fail-safe knock-off block for use during the repair or servicing of oil well surface pumping equipment involving a longitudinally slotted pipe capped at each end by top and bottom pipe segments which are held in place concentric to the slotted pipe by a resilient handle. An inner handle on the slotted pipe allows the concentric caps to be rotated axially from an open position to a closed position, thus encircling the polish rod. The weight of the sucker rod string on the end caps during use compresses the end caps and resilient handle thus locking the safety block such that it can neither open nor come off the well head.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.