Apparatus and methods for limiting movement of gripping members
US9194192B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2011 |
| Grant date | Nov 24, 2015 |
| Priority date | — |
| Expiry date | May 7, 2033 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Apparatus and method for limiting movement of gripping members of an elevator are provided. The apparatus includes a locking arm coupled to one or more of the gripping members and configured to move in a first direction when the gripping members move toward engagement with a tubular and to move in a second direction when the gripping members move away from engagement with the tubular. The apparatus also includes a first engagement member configured to move between a disengaged position, in which the first engagement member and the locking arm are relatively moveable, and an engaged position, in which the first engagement member allows the locking arm to move in the first direction but restrains the locking bar from moving in the second direction by more than a selected distance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.