Apparatus for a cam-based jack assembly for use in materials, testing machines and an accompanying method for use therewith
US7827868B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2008 |
| Grant date | Nov 9, 2010 |
| Priority date | — |
| Expiry date | Dec 26, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N3/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A jack assembly, for use in a materials testing system, utilizes both a cam and a resilient push block. The cam, having an progressive eccentric, is situated between the push block and a jaw housing and located partially within a corresponding shallow channel in each such that both channels effectively straddle the cam. The channels accommodate axial rotation of the cam. The push block is formed of a material with an appropriate modulus of elasticity such that bending moments, particularly at ends of the push block and resulting from axial rotation of the eccentric to its top dead-center position, cause the channel in the push block to elastically deform and increasingly and sufficiently deflect against and around the eccentric, thus increasingly pinching the eccentric and securely locking the cam, push block and specimen grip in their proper positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.