Position retaining device for draftsman chair

Details Position retaining device for draftsman chair Position retaining device for draftsman chair

1985-06-26

1986-11-18

Zugel, Francis K.

Chairs and seats

Bottom or back

Framework

248230, A47C 750

Patent

active

046231951

ABSTRACT:
A draftsman's chair having a footrest adjustable vertically along a support column for the chair; the footrest having a sleeve hub slidable on the column wherein a retaining device comprising a pair of interconnected spaced rings receives the sleeve hub there between and an interconnecting member provides a threaded hole for an adjustable knob having a shaft with an end face adapted to bear against the sleeve hub and to cause lateral displacement of the spaced rings to provide oppositely directed pressure contact against the support column to firmly position and retain the footrest at a selected position.

REFERENCES:
patent: 1723363 (1929-08-01), McArdle
patent: 1854478 (1932-04-01), Meyers
patent: 2529173 (1950-11-01), Moyer et al.
patent: 3458234 (1969-07-01), Bates
patent: 3564743 (1971-02-01), Gilmoure
patent: 4167033 (1979-09-01), Fletcher

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