Safety device for ladder climbers
US3979797A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 9, 1974 |
| Grant date | Sep 14, 1976 |
| Priority date | — |
| Expiry date | May 9, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T24/394
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A safety clamp slidably mounted on a vertical safety carrier, such as a cable or rod, in proximity to a ladder is attached to a workman's belt by a pivotal actuating arm which shifts a wedge plate into clamping engagement with the safety carrier immediately under free-fall conditions encountered if the workman falls from the ladder. The wedge plate is shiftably mounted in a clamping bracket in such a way that its upward closing movement against a safety carrier is assisted by the frictional force of the stationary safety carrier on an elongated clamping side of the wedge plate. Instantaneous actuation of the wedge plate into clamping engagement with the safety carrier in response to the slightest pivotal movement of the actuating arm towards its closing position is provided by cam action between the wedge plate and a cam member on the clamping bracket.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.