Metal working – Method of mechanical manufacture – Obtaining plural product pieces from unitary workpiece
Patent
1995-08-16
1997-05-20
Bryant, David P.
Metal working
Method of mechanical manufacture
Obtaining plural product pieces from unitary workpiece
294263, 29 33Q, 29 33S, 7240506, B23P 1700
Patent
active
056302665
ABSTRACT:
A method and apparatus for making a plurality of integral support plates for chairs, involving passing a strip of metallic material along a forming line and carrying our a series of operations on the strip, including: piercing and lancing holes, removing material adjacent the holes to permit use of a strip carrier, and cutting notches in opposed longitudinal sides at a first stage; then lancing the strip along two substantially transverse lines extending inwardly to the lancing holes; then carrying out a plurality of sequential operations for creating an integral, closed-ended sleeve projecting from the plate. A subsequent stage involves piercing the closed end of the sleeve and trimming away excessive edge material around the plate. At a later stage, reinforcement ribs are provided, along with any additional profiles that are needed. Then, mounting holes and any required slots are pierced. Finally, the completed support plate is cut from the strip.
REFERENCES:
patent: 1990718 (1935-02-01), Swanstrom
patent: 5271140 (1993-12-01), Futamura et al.
patent: 5526668 (1996-06-01), Futamura et al.
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