A - Human Necessities – 01 – F
Patent
A - Human Necessities
01
F
130/24
A01F 12/16 (2006.01)
Patent
CA 1097552
STONE GUARD FOR HARVESTERS ABSTRACT OF THE DISCLOSURE A stone guard for use with a harvester or combine of the type having a rotatable threshing cylinder and a concave lying contiguous and radially outwardly of the threshing cylinder whereby grain is threshed from a crop fed by a feeder means to the interspace between the threshing cylinder and the concave. A stone guard door is interposed in the crop flow path between the feeder means and the interspace between the threshing cylinder and the concave. The stone guard door comprises a main body portion which is pivotally connected to stationary combine structure contiguous the discharge end of the feeder means, and a lip portion hingedly connected to the main body portion. A detent means carried by the stone guard door normally maintains the lip portion rigid with respect to the main body portion. The lip portion normally rests on the forward edge of the concave when the detent means is engaged, whereby to maintain the stone guard door in a closed position. The detent means is adapted to be released by the force or impact of a stone or the like on the stone guard door. Release of the detent means permits the lip portion to pivotally move about its hinged connec- tion to the main body portion, causing the lip portion to drop off the edge of the concave. This permits the stone guard door to drop by gravity about the pivotal connection of the main body portion to the combine structure, to thereby discharge the stone or the like before it reaches the interspace between the threshing cylinder and the con- cave. The main body portion of the stone guard door is pivotally mounted on a rotatable shaft, and means are pro- vided interconnecting the rotatable shaft and the stone guard door whereby rotation of the shaft either manually or by power means causes reclosing and relatching of the stone guard door. An auxiliary detent means is provided and is operatively related to the lip portion of the stone guard door to maintain the lip portion in fully open unlatched position after the stone guard door has moved to open position, in order to insure that during the relatching operation the stone guard door can move upwardly beyond and in clearing relation to the forward edge of the concave.
332783
Allis-Chalmers Corporation
Swabey Ogilvy Renault
LandOfFree
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