# US 4,392,904 A · Sculptured lamp base

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- Number: US 4,392,904 A
- Document ID: US4392904A
- Status: Granted
- Kind: A
- Application number: 06/225,009
- Filed: 1981-01-14
- Granted: 1983-07-12
- Earliest claimed: 1981-01-14
- Inventors: Gregory A. Van Pelt
- Web page: https://patentgrep.com/patent/US4392904A

## CPC

- B65H 81/00: Methods, apparatus, or devices for covering or wrapping cores by winding webs, tapes, or filamentary material, not otherwise provided for (forming hollow objects by winding filamentary material on to fusible or soluble cores {B29C53/56} ; wrapping for the purpose of packaging B65B11/00; making wound articles of paper B31C)
- B31F 5/00: Attaching together sheets, strips or webs; Reinforcing edges
- F21V 21/06: Bases for movable standing lamps; Fixing standards to the bases (F21V21/08 takes precedence)
- B65H: HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B31F: MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER (making layered products not composed wholly of paper or cardboard B32B)
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR

## Abstract

A sculptured lamp base suitable for electric lamps is provided by utilizing a tightly-wound spiral of corrugated cardboard strip which is distended along a dimension parallel to its axis through forming upon a mold. The resulting sculptured lamp bases are capable of an infinite variety of shapes. Various components may be formed through utilization of this method and joined to form additional compound and return curves.

## Claims

### Claim 1

In a method for the production of sculptured lamp bases, the steps comprising: winding a pre-slit strip of single wall corrugated cardboard around a central core threaded or otherwise designed for the attachment of lamp hardware to form a tightly wound spiral of a certain diameter; positioning said spiral on a mold comprising a plurality of ribs radiating around a vertical axis coincident with said central core; distending said spiral downwardly along said mold beginning with the centermost position of said spiral; tautly shaping the distended spiral to conform with the shape of the mold; applying glue to the molded spiral to the inner surfaces thereof and about the central core and the outermost edge of the spiral; repeating the prior steps to form a mating molded spiral; gluing the bottom of the first molded spiral to the top of the mating spiral; and coating the completed lamp base with glue.

### Claim 2 (depends on 1)

A method according to claim 1 in which the primary and secondary molds are similarly shaped so that the first molded spiral and the mating molded spiral comprise mirror images of each other.

### Claim 3 (depends on 1)

A method according to claim 1 in which the primary and secondary molds are of different shapes so that the first molded spiral and the mating molded spiral comprise different shapes to provide an asymmetrical lamp base.