Material or article handling – Vertically swinging load support
Reexamination Certificate
2007-01-09
2007-01-09
Underwood, Donald (Department: 3652)
Material or article handling
Vertically swinging load support
C172S481000
Reexamination Certificate
active
10944231
ABSTRACT:
A work machine has a lift arm assembly pivotably coupled to a frame assembly at a forward frame pivot. The lift arm assembly includes a pair of spaced-apart lift arms and an extensible lift cylinder. The lift cylinder is pivotably coupled to the lift arms at a lift cylinder connection pivot. The lift cylinder is pivotably coupled to the frame assembly such that extension of the lift cylinder moves the lift arms with respect to the frame assembly about the frame pivot. A boom stop is pivotably coupled to the lift cylinder connection pivot. The boom stop is movable from an inoperable position with a remote end adjacent the lift arms to an operable position wherein the boom stop engages the frame assembly and prevents lowering movement of the lift arms with respect to the frame assembly. The lift arm assembly also can include a latch assembly coupled to one of the lift arms for holding the boom stop in the inoperable position.
REFERENCES:
patent: 3223251 (1965-12-01), Rothe et al.
patent: 3272558 (1966-09-01), Rathman et al.
patent: 3805463 (1974-04-01), Lang et al.
patent: 3918601 (1975-11-01), Zimmerman
patent: 4033469 (1977-07-01), Frank et al.
patent: 4039093 (1977-08-01), Schmitz, Jr. et al.
patent: 4141257 (1979-02-01), Hammond et al.
patent: 4189278 (1980-02-01), Dewey
patent: 4218094 (1980-08-01), Leaver
patent: 4275984 (1981-06-01), Lenertz
patent: 4305619 (1981-12-01), Sas
patent: 4347031 (1982-08-01), Friesen et al.
patent: 4522554 (1985-06-01), Williams et al.
patent: 5009566 (1991-04-01), Asche
patent: 5531561 (1996-07-01), Rae et al.
patent: 6149374 (2000-11-01), Dershem et al.
patent: 6729830 (2004-05-01), Wagner et al.
International Search Report.
Written Opinion.
Celley Robert J.
Curl William H.
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