Supports – Stand – Standard type
Patent
1975-07-15
1977-07-05
Staab, Lawrence J.
Supports
Stand
Standard type
F16M 1100
Patent
active
040335437
ABSTRACT:
A device for adjusting the height of the seat of an arm-chair and the like having a vertical hollow shaft fixed to the seat and telescopically received into a hollow base column and comprising a coaxial rod slidably received into said hollow shaft, on the upper end of which acts a control lever, said hollow shaft having an outer diameter smaller than the inner one of said column which at its upper part is provided with an inner bushing to support and guide said shaft while at its lower portion it carries a plug-like member having a conical outer surface and through which passes said rod, at the lower end of which is mounted a coaxial cylindric bowl having an outer diameter smaller than the inner diameter of said column and in which is arranged a crown of at least three radial holes to house small metal balls so that through said holes said balls can partially project outwardly, a first helical spring being mounted between said bowl and said plug member, while a second helical spring is mounted between an intermediate collar of said rod and the upper end of the plug member, said conical outer surface having its largest and smallest diameters such as to permit that this member in different axial positions with regard to the ball crown moves said balls towards the outside of the bowl into engagement with said column or vice versa, while a third spring is mounted to return the control lever to its inoperative position the shaft.
REFERENCES:
patent: 720549 (1903-02-01), Adler
patent: 2658777 (1953-11-01), Rauglas
Anonima Castelli S.p.A.
Staab Lawrence J.
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