Snubber for excavator bucket door

Details Snubber for excavator bucket door Snubber for excavator bucket door

1997-09-24

1999-11-02

Pezzuto, Robert E.

Excavating

Scoop or excavating and transporting container

Scoop or bucket structure, per se

37445, 188307, F16F 914

Patent

active

059747056

ABSTRACT:
A Snubber is used to damp the swing of the door on an excavator bucket to prevent the door form being damaged by repeatedly slamming shut. The snubber has housing which mounts to an excavator bucket and a shaft pivotally mounted in the housing and connected to an excavator door. The shaft turns when the excavator door opens. The housing has a cylindrical cavity around the shaft. The cavity is divided into two volumes by a dam and a wiper arm on the shaft. The wiper arm forces hydraulic fluid to flow through an orifice between the volumes as the shaft turns. The wiper arm has end seals which seal against end walls of the cavity. The end seals are forced outwardly by hydraulic pressure when the door is closing. A one-way valve allows hydraulic fluid to bypass the orifice while the door is opening. The snubber requires less maintenance than previous friction snubbers.

REFERENCES:
patent: 3140080 (1964-07-01), Rumsey
patent: 3402486 (1968-09-01), Branson
patent: 4006832 (1977-02-01), Auxen et al.
patent: 4054186 (1977-10-01), Banks, Jr. et al.
patent: 4057237 (1977-11-01), Nemeth
patent: 4063373 (1977-12-01), Greer
patent: 4609081 (1986-09-01), Hungerford
patent: 4723639 (1988-02-01), Hungerford
patent: 4770083 (1988-09-01), Johnson
patent: 5064033 (1991-11-01), Koike

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