Dual weight assembly for a crane
US5454474A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1994 |
| Grant date | Oct 3, 1995 |
| Priority date | — |
| Expiry date | Oct 13, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB66C13/50
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The disclosure involves a material handling machine, e.g., a crane, having a control circuit switch and a power limit switch. Disclosed is a new weight assembly having first and second weights. The control switch is maintained at a position by the first weight and the power switch is maintained at a position by the second weight which is positioned above the first weight. The weights are telescoped to one another so that vertical weight alignment is assured as the crane hoist bottom block contacts and lifts the first weight. If the bottom block continues its upward travel past a maximum desired elevation, the first weight (urged by the bottom block) lifts the second weight, permitting the power limit switch to trip and preventing the bottom block from continuing upward. And the new assembly is ideal where the space available for limit switch weights is restricted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.