Retarding mechanism for the dipper door of a mining shovel
First Claim
1. In a digging implement having a body and movable door mounted with respect to the body and a mechanism for retarding movement of the door, and wherein the mechanism includes first and second housings and plural retarding discs compressed between the housings, the improvement comprising a first resilient member interposed between the first housing and the discs, and a second resilient member interposed between the second housing and the discs.
3 Assignments
0 Petitions
Accused Products
Abstract
Disclosed is a digging implement such as a mining shovel dipper which has a body, a movable door mounted with respect to the body and a mechanism for retarding swinging movement of the door. The mechanism includes first and second housings and plural retarding discs compressed between the housings. In the improvement, a resilient member is interposed between the first housing and the discs. And most preferably, a separate resilient member is interposed between each housing, respectively, and the discs. The thickness of each resilient member is selected in view of the aggregate thickness of the discs and the number of resilient members if more than one such member is used. A highly preferred resilient member is an elastomeric washer. The new retarding mechanism substantially extends the time period between mechanism adjustments and results in improved machine productivity.
44 Citations
13 Claims
- 1. In a digging implement having a body and movable door mounted with respect to the body and a mechanism for retarding movement of the door, and wherein the mechanism includes first and second housings and plural retarding discs compressed between the housings, the improvement comprising a first resilient member interposed between the first housing and the discs, and a second resilient member interposed between the second housing and the discs.
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7. A mechanism for retarding movement of the door of a mining shovel dipper including:
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a plurality of arms extending in a first direction from a pivot axis, such plurality of arms including a first arm and a second arm; a plurality of plates extending in a second direction from the pivot axis, each plate being between a separate pair of arms; a separate retarding disc between each plate and each arm, such discs being concentric with the pivot axis; first and second housings compressing the arms, the plates and the discs; and first and second resilient members compressed between the first and second housings, respectively. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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Specification