Traversing hoists – Having means facilitating assembly or disassembly – Of boom sections
Patent
1985-01-25
1986-11-11
Blix, Trygve M.
Traversing hoists
Having means facilitating assembly or disassembly
Of boom sections
212187, 212266, 292143, B66C 2370
Patent
active
046217428
ABSTRACT:
A mobile crane comprises a multi-section telescopic main boom and a boom extension pivotally connected to the point end of the main boom. The boom extension can be manually swung horizontally between an in-use position extending axially from the point end of the main boom and a stored position parallel to and alongside the main boom. Front and rear boom extension storage mechanisms releasably secure the boom extension in stored position. The front mechanism comprises two vertically spaced-apart storage pins which are slidable in tubular pin guides mounted on one lateral side of the main boom. The storage pins are slidably movable fore and aft by a swingable lever to which they are pivotally connected. The storage pins move into and out of engagement with a pair of vertically spaced-apart aligned pin-engaging holes in a member attached to a confronting side of the boom extension when the latter is in stored position. The lever is not only pivotable but is axially shiftable into and out of latched position and is biased into latched position to prevent unlatching due to "bounce". The rear storage mechanism comprises a ramp on the side of the main boom which engages and supports a roller on a member attached to a confronting side of the boom extension and a removable pin secures the member to the ramp.
REFERENCES:
patent: 1749769 (1930-03-01), Johnson
patent: 2611580 (1952-09-01), Troche et al.
patent: 2867333 (1959-01-01), De Shano
patent: 2986829 (1961-06-01), Myers
patent: 3196979 (1965-07-01), Garnett
patent: 3785505 (1974-01-01), Keller
patent: 4431109 (1984-02-01), Behrendt et al.
patent: 4483447 (1984-11-01), Bernabe
Blix Trygve M.
Brahan Thomas J.
Harnischfeger Corporation
Nilles James E.
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