Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Tilts relative to base
Patent
1976-05-06
1977-09-06
Braun, Leslie
Static structures (e.g., buildings)
Mechanism operated relatively movable shaft assembly
Tilts relative to base
212 55, 212144, B66C 2304
Patent
active
040459233
ABSTRACT:
A telescopic extension jib for crane booms increases the reach of the boom and therefore increases the utility of the construction crane. To facilitate manual extension and retraction of the movable jib section relative to the fixed base section, a system of rollers is employed between the relatively movable jib sections. In the socketing area of the jib at full jib extension, upper and lower rollers are spring-mounted and can bear the dead weight of the movable jib section when the same is unloaded. Coacting bearing pads engage the top and bottom faces of the movable jib section under loading to distribute stresses over larger areas, the spring-mounted rollers retracting automatically to enable the movable jib section to engage the bearing pads in the socketing area. A locating pin is provided to lock the jib sections against accidental relative movement in both the extended and retracted positions of the jib.
REFERENCES:
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patent: 3259251 (1966-07-01), Stauffer
patent: 3341029 (1967-09-01), Barkley et al.
patent: 3407947 (1968-10-01), Valla
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patent: 3796016 (1974-03-01), Wu
patent: 3972571 (1976-08-01), Benkowski
Braun Leslie
Walter Kidde & Company, Inc.
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