Obstacle detector for a descending or ascending load
US4438903A · kind A · utility
Inventors
Key dates
| Filing date | May 7, 1982 |
| Grant date | Mar 27, 1984 |
| Priority date | — |
| Expiry date | May 7, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63J1/028
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An obstacle detector is disclosed, being designed to automatically brake a descending or ascending load suspended on at least two spaced cables, should an obstacle be encountered in the path of the load. The detector comprises at least two winch drums and a rotatable horizontal rod having at least two laterally-spaced levers projecting radially therefrom and inclined on opposite sides of the rod. One end of each cable is secured to a drum, passes through a pulley supporting the load and is secured to a corresponding lever at its other end. A change in the tension of one of the cables, due to an obstacle, results in a small rotation of the rod, thus activating an electric sensing device which effectively shuts down the motor driving the winch drums.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.