Rock picking device
US4905767A · kind A · utility
Inventor
Key dates
| Filing date | Jun 8, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Jun 8, 2008 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA01B43/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A device for picking rocks from a field includes a frame which is mounted on a pair of wheels. A hitch is pivotally attached to the frame and is adapted for engagement with a conventional tractor. The offset of the hitch is adjusted by a hydraulic cylinder to adjust the tracking of the frame behind the tractor. A reel is mounted for rotation on the frame and is powered by a chain and sprocket drive from a rotary hydraulic motor. The reel has a plurality of radially extending spokes, each terminating in a stone picking rake formed by a plurality of spaced teeth. The elevation of the reel with respect to ground level is adjusted by a pair of hydraulic cylinders connected to a pivotal reel mounting frame. A depth stop mechanism is provided to lock the reel in an adjusted elevational position. In a first embodiment, a semi-cylindrical stone collecting box is mounted within the reel frame. As each of the reel spokes rotates to a top position, collected stones fall by gravity into the open stone box. A hinged door is provided in the bottom of the stone box and is operated by a hydraulic cylinder for enabling the collected to be deposited in a desired location. In a second embodiment, the…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.