Safety lock device with rotating clover mechanism
US6315089A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1999 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Aug 31, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T74/214
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A safety lock device including a clover mechanism mounted on a rotating shaft to be used with an unbalanced free-fall dog that precludes rotation of the rotating shaft upon rapid acceleration or excessive speed of the rotation of the shaft. The free-fall dog is pivotally mounted on a fulcrum upon which the free-fall dog may teeter in an unbalanced seesaw motion. At opposite ends of the fulcrum are a locking finger and an arm. The free-fall dog is unbalanced such that the arm contacts the clover mechanism as it rotates while the locking finger does not contact the clover mechanism at slow rotating speed. At a slow rotative speed, the arm is only slightly deflected. With great acceleration, the arm is deflected farther from the clover mechanism thereby causing the locking finger on the opposite side of the fulcrum to be pivoted into the clover mechanism. The locking finger, which upon sufficient force to the arm, is injected into the gap between two protuberances of the clover mechanism by a reactive force to the force asserted on the arm. This locks the clover mechanism, which prevents further rotation of the rotative shaft. Thus, the downward movement of any items attached to the r…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.