Static structures (e.g. – buildings) – Shaft or openwork – axially extensible
Patent
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.
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patent: 3841494 (1974-10-01), Chalupsky et al.
patent: 3874136 (1975-04-01), Michel
Ade Stanley G.
Brown Leslie
Mancole Company Limited
Purser Ernest R.
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