Folding structures considered to be primarily useful for play pu

Details Folding structures considered to be primarily useful for play pu Folding structures considered to be primarily useful for play pu

1977-04-12

1978-10-31

Purser, Ernest R.

Static structures (e.g., buildings)

Barrier or major section mounted for in situ repositioning;...

Three walls hinged at their intersections

217 14, 217 46, 5 99B, 312258, E04B 1344

Patent

active

041226380

ABSTRACT:
Folding structures useful for a variety of different utilitarian and play purposes can be constructed so as to utilize a Sarrus linkage modified so as to include an overcenter toggle mechanism to reinforce the linkage against inadvertent or undesired folding from an expanded position. As used in accordance with the invention such a Sarrus linkage includes two non-folding members or walls which are connected by two separate folding wall structures. Each of such wall structures includes two non-folding parts, an intermediate hinge connecting such parts, and edge hinges connecting such parts to the non-folding members or walls. At least one of the connecting wall structures is formed so as to serve as an overcenter toggle which is capable of holding the two non-folding members or walls in the expanded position while the other of the connecting wall structures serves to limit the movement of the non-folding members or walls away from one another so as to serve to apply pressure on the connecting wall structure serving as the toggle. The folding structures of the invention are useful as various different types of play equipment but are considered to have other utility.

REFERENCES:
patent: 921789 (1909-05-01), Baker
patent: 1001051 (1911-08-01), Kohout
patent: 2059058 (1936-10-01), Swanson
patent: 2471462 (1949-05-01), Toth
patent: 3094714 (1963-06-01), Lates
patent: 3525451 (1970-08-01), Asser

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