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Rigid Foam Platen

IP.com Disclosure Number: IPCOM000082001D
Original Publication Date: 1974-Sep-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Duggins, GA: AUTHOR [+2]

Abstract

This platen structure offers greater rigidity at low cost. The version in Fig. 1a has two small shafts 1, 2 supporting foam rubber 3. A suitable material is a magnesium rubber compound. The version in Fig. 1b has a single shaft 4.

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Rigid Foam Platen

This platen structure offers greater rigidity at low cost.

The version in Fig. 1a has two small shafts 1, 2 supporting foam rubber 3. A suitable material is a magnesium rubber compound. The version in Fig. 1b has a single shaft 4.

Fig. 2 represents still another version having an end plug 5 and suitable for IBM "Selectric" typewriters. The rigid foam replaces rubber (foreign), steel core, paper tubing, steel pins, glue, and stamping.

Manufacturing operations eliminated are oven (bake), assembly of core to rubber, hot upset, trimming rubber, assembly of end plugs, and grinding rubber. Scrap is also reduced since voids in rubber, for example, are not detected until the grinding operation, thus sometimes the entire assembly must be scrapped.

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