Reinforced bearing aperture in thermoplastic sheet material

Details Reinforced bearing aperture in thermoplastic sheet material Reinforced bearing aperture in thermoplastic sheet material

1979-05-09

1980-05-06

Hoag, M.

Plastic article or earthenware shaping or treating: apparatus

Preform severing means

Severing means is perforator

4253021, 4253241, 425384, 425404, 425469, B29C 2300, B29C 1700

Patent

active

042015316

ABSTRACT:
Relatively light gauge thermoplastic sheet material is pierced by a hot punch to provide a bearing aperture. The hot punch is held in sheet-penetrating position long enough to cause plastic flow of displaced material and formation of a collar-like hub surrounding the aperture. The hot punch is withdrawn and replaced by a cool punch to retard further plastic flow of the displaced material, thereby fixing the aperture in desired size and shape. There results a bearing aperture having an axial length greater than the starting thickness of the sheet material, and consequently a larger bearing surface integrally formed locally in the sheet material. Apparatus for forming the bearing aperture is also disclosed.

REFERENCES:
patent: 1960881 (1934-05-01), Sunbury
patent: 3213175 (1965-10-01), Wallace
patent: 3236132 (1966-02-01), Goulet et al.
patent: 3449791 (1969-06-01), Zetzsche
patent: 3517410 (1970-06-01), Rapisarda

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