Woodworking – Special-work machine – Combined
Reexamination Certificate
2006-02-14
2006-02-14
Banks, Derris H. (Department: 3725)
Woodworking
Special-work machine
Combined
C144S034100, C144S382000, C091S533000
Reexamination Certificate
active
06997221
ABSTRACT:
The knuckle boom includes a hoist boom having a proximal end pivoted to a machine base, and a stick boom having a proximal end pivoted to a distal end of the hoist boom. At least one hydraulic hoist cylinder is mounted between the machine base and the hoist boom, and at least one hydraulic stick cylinder is mounted between the hoist boom and the stick boom. A hydraulic circuit supplies hydraulic oil to the cylinders, and provides an oil flow path between working ends of the cylinders so as to transfer a slug of pressurized hydraulic oil between the working ends. In one embodiment, reaching movement is controlled by a pump connected to control transferring of the slug between the hoist and stick cylinders. The pump determines which cylinder receives which portion of the slug of oil, and thereby controls the angle between the booms, thereby producing reach.
REFERENCES:
patent: 3583585 (1971-06-01), Joyce
patent: 3960284 (1976-06-01), Carpenter
patent: 5293914 (1994-03-01), Hudson
patent: 5699247 (1997-12-01), Moriya et al.
patent: 5979518 (1999-11-01), Hamby
patent: 6443196 (2002-09-01), Kurelek
patent: 6763863 (2004-07-01), Liu
Kurelek John
Somerville Grant J.
Armstrong R. Craig
Banks Derris H.
Borden Ladner Gervais LLP
Self Shelley
Tigercat Industries Inc.
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