Chairs and seats – Bottom or back – Framework
Patent
1975-10-15
1977-07-19
Mitchell, James C.
Chairs and seats
Bottom or back
Framework
297232, 297248, A47C 702
Patent
active
040365271
ABSTRACT:
This invention provides a frameless, stress skin seat construction which can be attached without frame members either to others of its kind or to a supporting surface. The seat construction includes a seat pan of sheet metal formed to define beam-portions at opposite sides, a cylindrical portion at the front for load supporting capacity, and a concave upward dished portion in the rear to add torsion resistance. The construction also includes a back pan of sheet metal which is shaped to define rearwardly opening beam portions at opposite sides, a concave forward dished portion in the lower half to add torsion resistance, and a rearwardly opening U-shaped channel at the top for providing beam strength. The two pans are secured together in such a way that a force sufficient to fold the pans together will cause buckling primarily at the joint between them, rather than any buckling in the pans themselves.
REFERENCES:
patent: 2564924 (1951-08-01), Patton
patent: 3101218 (1963-08-01), Baermann
patent: 3501200 (1970-03-01), Ohta
patent: 3625565 (1971-12-01), Barecki
patent: 3630566 (1971-12-01), Barecki
patent: 3695689 (1972-10-01), Babecki
patent: 3747979 (1973-07-01), Barecki
patent: 3797887 (1974-03-01), Barecki et al.
patent: 3873155 (1975-03-01), Babecki
patent: 3897974 (1975-08-01), Barecki
patent: 3907363 (1975-09-01), Baker et al.
Mitchell James C.
Otaco Limited
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