Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Plural sequential shaping or molding steps on same workpiece
Patent
1993-10-19
1995-12-05
Lazarus, Ira S.
Plastic and nonmetallic article shaping or treating: processes
Mechanical shaping or molding to form or reform shaped article
Plural sequential shaping or molding steps on same workpiece
264296, 264322, 362351, 362358, 362361, B29C 5384
Patent
active
054726565
ABSTRACT:
A lampshade is manufactured from heat deformable sheet material by forming a blank of the sheet material, in the shape of a sector of an annulus, into a hollow truncated cone having upper and lower peripheral edges. The overlapping edges of the blank are temporarily tacked together and the blank supported by an apparatus which engages the interior of the conical blank, which apparatus includes a former for engagement with the interior surface of the blank adjacent the upper and lower peripheral edges thereof so that marginal edge portions of the blank project beyond the formers. Heating means heat the marginal edge portions and upper and lower die members engage the heated and softened marginal edge portions to fold or roll the deformable sheet material around the edge portions of the formers and thereafter hold the formed edge portions in place until the material has cooled. The edge portions of the formers have the form of rounded beads so that the edge portions of the material deformed therearound have the form of incompletely closed cavities or pockets. The workpiece is removed from the apparatus after separating the temporary tack welds joining the ends of the blank, the product removed from the apparatus, and a mounting bracket having a peripheral ring is fitted with the peripheral ring being pushed into the annular channel at the respective rolled-over edge of the shade, after which the straight edges of the shade material are re-united by a permanent weld to complete the shade.
REFERENCES:
patent: 3484518 (1969-12-01), Ignell
patent: 4867929 (1989-09-01), Albrecht et al.
patent: 4896415 (1990-01-01), Bock
Diamond Andrew C.
Wheatley Jeremy D.
Cariaso Alan B.
Lazarus Ira S.
Welwyn Lighting Designs Limited
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