Pipe joints or couplings – With casing – lining or protector – Insulated
Patent
1984-02-13
1986-07-15
Punter, William H.
Pipe joints or couplings
With casing, lining or protector
Insulated
285402, 350257, 350571, G02B 2302, G02B 702, F16L 3724
Patent
active
046002774
ABSTRACT:
A telescope system having a main housing and at least two interchangeable viewing assemblies. The main housing contains an objective lens assembly for producing an inverted primary image, a field lens, and a combination power adjusting zoom and image erecting lens assembly for producing an erect secondary image. The interchangeable viewing assemblies are selectively coupled to the main housing to provide either straight through or offset viewing of the erect secondary image. The offset viewing assemblies contain an image-convertor to provide erect offset viewing. The viewing assemblies have bayonet couplers which engage a bayonet receiver on the main housing to provide detachable coupling. The main housing has a retractable lock pin which locks the selected viewing assembly to the main housing while the telescope system is in use.
REFERENCES:
patent: 1530081 (1925-03-01), Humbrecht et al.
patent: 1837993 (1931-12-01), Patterson
patent: 2086372 (1937-07-01), Van Albada
patent: 2260991 (1941-10-01), Gorey
patent: 2610545 (1952-09-01), Davidson
patent: 3438689 (1969-04-01), Wehr
patent: 3620149 (1971-11-01), Ogihara
Walker, B. "Pechan Derotation Prism-Application & Alignment Notes", Optical Engineering, 11/12-74, pp. G233-234.
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