Lockable display frame

Details Lockable display frame Lockable display frame

1982-09-30

1988-12-20

Murtagh, John E.

Static structures (e.g., buildings)

Lazy tong extension unit

52646, E04B 274

Patent

active

047917610

ABSTRACT:
A collapsible, articulated structural section which is movable between a stable erect configuration and a collapsed configuration includes a manually actuable positive lock for locking the device in its erect configuration. Four pairs of scissored links connected to exterior pivots at their ends form the exterior of the section, and the interior is formed by a pair of face pivots and four pairs of crossed, but unconnected, face links, each pivotally connected at one end thereof to an exterior pivot and at the other end thereof to a face pivot. A through-extending opening is provided in one face pivot, and a locking component including a shaft portion insertable into the opening, and a rotatable locking member mounted on the end of the shaft, are mounted on the other face pivot.

REFERENCES:
patent: 3053351 (1962-09-01), Fulcher
patent: 3220152 (1965-11-01), Sturm
patent: 3375624 (1968-04-01), Mikulin
patent: 3381923 (1968-05-01), Berry
patent: 3710806 (1973-01-01), Kelly
patent: 3861107 (1975-01-01), Papayoti
patent: 3968808 (1976-07-01), Zeigler
patent: 4026313 (1977-05-01), Zeigler
patent: 4129975 (1978-12-01), Gabriel
patent: 4276726 (1981-07-01), Derus
patent: 4290244 (1981-09-01), Zeigler
patent: 4332501 (1982-06-01), Slysh
Nomadic Structures, Inc. brochure (admitted prior art).
"Unique" brochure in the Swedish language (admitted prior art).
"Genii" Instruction Sheet (admitted prior art).

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