Working machine for hydraulic excavator

Details Working machine for hydraulic excavator Working machine for hydraulic excavator

1993-01-14

1995-06-13

Underwood, Donald W.

Material or article handling

Vertically swinging load support

Shovel or fork type

212261, 212300, E02F 338

Patent

active

054236550

ABSTRACT:
A hydraulic excavator includes a boom comprising an articulated first and second boom member, an arm, a bucket, a boom cylinder for operating the boom, an arm cylinder for operating the arm; and a bucket cylinder for operating the bucket. The boom cylinder is cooperatively associated with the boom to establish a geometry wherein, during operation, the axis of the boom cylinder can never pivot rearwardly across a dead point of the boom and therefore eliminate the possibility of dead locking of the boom during operation.

REFERENCES:
patent: 2995261 (1961-08-01), Soyland et al.
patent: 3589539 (1971-06-01), Witwer
patent: 4029225 (1977-06-01), Wirt
Patent Abstracts of Japan vol. 016, No. 446 (M-1311) 17 Sep. 1992 & JP-A-41 55 022 (Komatsu Ltd.) 28 May 1992.
Patent Abstracts of Japan vol. 015, No. 093 (M-1089) 6 Mar. 1991 & JP-A-23 08 016 (Komatsu Ltd.).
Patent Abstracts of Japan vol. 013, No. 398 (M-866) 5 Sep. 1989 & JP-A-11 42 135 (Komatsu Ltd.).

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