Static structures (e.g. – buildings) – Mechanism operated relatively movable shaft assembly – Fluid pressure actuated
Patent
1978-01-30
1980-01-29
Friedman, Carl D.
Static structures (e.g., buildings)
Mechanism operated relatively movable shaft assembly
Fluid pressure actuated
52118, 182 19, 182141, E04H 1234
Patent
active
041854268
ABSTRACT:
A telescoping boom lift apparatus having a first boom mounted about a first substantially fixed horizontal pivot axis in a mobile base for vertically pivotable movement with respect thereto and further having a second boom member carried by, and received in, the first boom member is provided with a link secured between a second substantially fixed horizontal pivot axis on the mobile base and a third horizontal pivot axis on the second boom member whereby, when the first boom is rotated through an increasing included vertical angle, the third pivot axis on the second boom member is moved therewith longitudinally of the first boom member and away from the first horizontal axis thereby reciprocating the second boom member along a portion of the length of the first boom member to cause the distal end of the second boom member to increasingly extend beyond the first boom member.
REFERENCES:
patent: 2548038 (1951-04-01), Moliskey
patent: 2771197 (1956-11-01), Leffler
patent: 3231044 (1966-01-01), Myers
patent: 3845596 (1974-11-01), Veenstra
patent: 4070807 (1978-01-01), Smith, Jr.
A-T-O Inc.
Friedman Carl D.
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