Radio-controlled skyline carriage
US4515281A · kind A · utility
Inventor
Key dates
| Filing date | Jul 21, 1982 |
| Grant date | May 7, 1985 |
| Priority date | — |
| Expiry date | Jul 21, 2002 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01G23/003
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A carriage for moving logs along a suspended skyline includes a pair of skyline wheels which rotate as the carriage moves along the skyline to drive a pair of alternately operating pumps which supply hydraulic pressure to a carriage hydraulic system. A first larger pump operates as the carriage moves uphill, while a second smaller pump operates when the carriage moves downhill. The carriage hydraulic system powers a driven hydraulic sheave and pressure roller for paying out a mainline. A skyline clamp is applied by a hydraulic ram and includes cammed surfaces which ride over a roller to ensure that the carriage will remain clamped to the skyline should the ram lose hydraulic pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.