Trolley stop for power and free conveyors
US4790247A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 4, 1986 |
| Grant date | Dec 13, 1988 |
| Priority date | — |
| Expiry date | Nov 4, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB61B10/04
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A trolley stop assembly is provided for use with an inverted power and free conveyor system having a trolley member driven along a track. A depending trolley dog is engaged by drive dogs on a drive mechanism for pushing the trolley along the track and is movable between upper and lower positions for disengagement and engagement with the drive dogs. The assembly includes a stop arm pivotally mounted within the conveyor system for pivoting about a horizontal axis. Provisions are made for lifting the stop arm into an upper position to engage a portion of a trolley dog on a trolley to be stopped to lift the trolley dog out of possible engagement with the drive dogs. The stop arm includes an upper cam surface with an abutment portion for braking the trolley by mating with a portion of the trolley dog. An actuator mechansim includes a cam engageable with the stop arm to pivot same between upper and lower positions. The cam member is actuated by a piston and cylinder arrangement positioned on a side of the assembly. Provisions are made for retaining the stop arm in an upper position without maintaining pressure in the cylinder.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.