Telescopic boom mechanism

Details Telescopic boom mechanism Telescopic boom mechanism

1986-09-25

1987-10-13

Nase, Jeffrey V.

Traversing hoists

Having vertically swinging boom

Having means to swing boom vertically

212269, 52118, B66C 2304

Patent

active

046992812

ABSTRACT:
A telescopic boom for use on an elevating apparatus includes a first boom, a second boom telescopically disposed in the first boom, a third boom telescopically disposed in the second boom, a rolling mechanism disposed between the first and third booms and rollingly movably on wall surfaces of the first and third booms, and a locking lever assembly disposed on each of ends of the second and third booms in the first boom for selectively engaging the rolling mechanism to connect the rolling mechanism to one of the second and third booms at a time.

REFERENCES:
patent: 3738075 (1973-06-01), Nansel
patent: 3841494 (1974-10-01), Chalupsky et al.
patent: 3863406 (1975-02-01), Quick
patent: 4373701 (1983-02-01), Kishi
patent: 4375248 (1983-03-01), Kishi
patent: 4466509 (1984-08-01), Kishi
patent: 4518061 (1985-05-01), Wehmeyer et al.

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