Apparatus for indicating critical torque load
US4435988A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 13, 1981 |
| Grant date | Mar 13, 1984 |
| Priority date | — |
| Expiry date | Jul 13, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L3/1464
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for indicating critical torque load in a drill string of a propeller shaft driven rotary drilling machine comprising an input and an output section in axial alignment and drivingly connected so as to rotate conjointly; the input section has an input shaft and a spiral spline affixed thereto; the output section has a tube shaft assembly and an output shaft affixed thereto; an input bearing is provided for rotatably supporting the input shaft and allowing for longitudinal movement of the input shaft toward the output section under conditions of increased torque load; an input housing for receiving the input bearing is affixed to a base; a receiver nut having a complementary female spiral spline is a companion for the spiral spline and is operatively connected to the spiral spline to permit longitudinal movement of the input shaft toward the output section under conditions of increased torque load; a compression spring prevents longitudinal movement of the input shaft under conditions of constant torque load; a rotatably fixed collar mounted on the input shaft indicates longitudinal movement of the input shaft; a bearing support and housing for the output section is attac…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.