Chair base
AssigneeHerman Miller, Inc.
InventorsThomas M. Edwards, Robert A. Nagelkirk
Life of this patent
Estimating the term…
Abstract
A chair base is constructed by stamping straps (16) from low carbon sheet stock, securing pairs of straps to a central hub (10) in parallel relation to one another to radiate outwardly from the central hub, and coating the straps and hub with a polyvinyl chloride coating (50). A caster socket block (20) may be secured between the two straps of each pair at an outer end (18) thereof. The central hub (10) and the caster sockets (20) may be covered by plastic shells (34).
Claims17
A method of making a chair base having seat mounting means and multiple legs secured thereto, said method comprising the steps of:
- forming a plurality of straps from low-carbon steel;
- securing pairs of said straps to the seat mounting means in parallel relation to one another to form said legs;
- heating said legs and said seat mounting means;
- and
- coating at least a portion of said straps and said seat mounting means with a coating of sufficient thickness to conceal surface imperfections therein and to provide an aesthetic finish.
A chair base having a seat mounting means comprising a hub formed of tubular steel;
- a plurality of legs fixed to said seat mounting means, each leg formed by a pair of straps spaced apart in parallel configuration, each strap formed of a low-carbon steel stamping and welded at one end thereof to said seat mounting means;
- said seat mounting means, and said legs having a coating of sufficient thickness to conceal the welds and surface imperfections therein.
Dependencies are inferred from the claim text.