Extending boom construction

Details Extending boom construction Extending boom construction

1974-11-22

1976-09-14

Purser, Ernest R.

Static structures (e.g., buildings)

Shaft or openwork, axially extensible

52118, E04H 1210

Patent

active

039798739

ABSTRACT:
A plurality of telescopic triangular cross sectioned booms slide within one another so that they can be extended and retracted and they are adapted to support conduits for pumping concrete or other material from one location to another. Angulated flanged corner constructions support the booms for sliding movement one with the other and in one embodiment, wheeled trolleys or bogeys are secured to the corners to reduce the frictional load between adjacent boom sections.

REFERENCES:
patent: 1319943 (1919-10-01), Bessolo
patent: 2339327 (1944-01-01), Fox
patent: 2684159 (1954-07-01), Oldenkamp
patent: 2920725 (1960-01-01), Emmons
patent: 2942700 (1960-06-01), Parmenter et al.
patent: 2948363 (1960-08-01), Hopfeld
patent: 3000473 (1961-09-01), Reynolds
patent: 3328921 (1967-07-01), Keslin
patent: 3494593 (1970-02-01), Blagg
patent: 3841494 (1974-10-01), Chalupsky et al.
patent: 3874136 (1975-04-01), Michel

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