Telescopic boom assembly having high dielectric properties

Details Telescopic boom assembly having high dielectric properties Telescopic boom assembly having high dielectric properties

1986-05-28

1987-06-30

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Means maintaining platform level on angularly movable support

Swingable support

52115, 52118, B66F 1104

Patent

active

046763406

ABSTRACT:
A telescopic boom assembly is disclosed. The assembly includes a plurality of boom members having at least first, second and third boom arms telescopically disposed within each other. The first boom arm is connected to a support base. A mechanism is provided for axially extending the second and third boom arms outwardly from the first boom arm, the third boom arm being constructed from dielectric material and disposed at the distal end of the assembly once the assembly is in a fully extended position. Finally, an end cylinder structure constructed from dielectric material is provided for axially moving the third boom arm relative to the first and second boom arms such that the third boom arm and the end cylinder structure dielectrically insulate the distal end of the third boom arm from the remainder of the boom assembly when the assembly is in an extended condition.

REFERENCES:
patent: 3136385 (1964-06-01), Eitel
patent: 3233700 (1966-02-01), Myers
patent: 3301346 (1967-01-01), Verrell
patent: 3489243 (1970-01-01), Prescott
patent: 3845596 (1974-11-01), Veentra
patent: 3947191 (1976-03-01), Milner
patent: 3958377 (1976-05-01), Milner
patent: 4258853 (1981-03-01), Gill
patent: 4327533 (1982-05-01), Sterner
patent: 4337601 (1982-07-01), Vaerk
patent: 4434444 (1984-08-01), Smith
patent: 4478014 (1984-10-01), Poock

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