Excavating – Scoop or excavating and transporting container – Scoop or bucket structure – per se
Patent
1997-06-16
1998-10-06
Graysay, Tamara L.
Excavating
Scoop or excavating and transporting container
Scoop or bucket structure, per se
37444, 414726, 16 86B, 267154, E02F 3407
Patent
active
058159606
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.
REFERENCES:
patent: 2434902 (1948-01-01), Burdick
patent: 2735559 (1956-02-01), Burdick et al.
patent: 2840253 (1958-06-01), Thompson
patent: 4006832 (1977-02-01), Auxer et al.
patent: 5613308 (1997-03-01), Little
Beach Thomas A.
Graysay Tamara L.
Harnischfeger Corporation
Shupe Larry
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