Drawworks brake control
US4519585A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1982 |
| Grant date | May 28, 1985 |
| Priority date | — |
| Expiry date | Oct 12, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B19/008
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
Apparatus for controlling a brake on a drawworks having cable wound thereon. A tension gauge detects the tension in the cable which is displayed on a switch gauge. A pulse generator provides periodic pulses to one side of a relay having a set of normally open contacts. When the tension is at or above a preselected level, the other side of the relay is grounded. The relay contacts pulse a pneumatic relay which is connected to a ram that operates the drawworks brakes. When tension is at or below a preselected level, a second pneumatic relay is actuated for maintaining the ram in a brake activating condition. A switch is connected to a third pneumatic relay, which in turn is connected to the ram to permit manual brake activation and deactivation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.