Shock absorber
US4679669A · kind A · utility
28Cited by
9References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 3, 1985 |
| Grant date | Jul 14, 1987 |
| Priority date | — |
| Expiry date | Sep 3, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/017
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A shock absorber for a wireline instrument, the shock absorber having solid, cylindrical upper body, a cylindrical sleeve, and a mandrel. The mandrel has a hexagonal upper portion, a circular center portion, and a lower nose portion. A bolt connects the mandrel to the upper body, so that the mandrel can move telescopically within the sleeve, but cannot fall out of the sleeve. Three carbide cutting elements are mounted on the sleeve adjacent to alternate sides of the upper portion of the mandrel for cutting chips of material off of the sides of the mandrel as the mandrel is moved into the sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.