Plunger assembly

Details Plunger assembly Plunger assembly

1976-09-07

1978-05-02

Griffin, Donald A.

Photocopying

Contact printing

Fluid pressure retention of carrier and receiver in exposure...

G03B 2720

Patent

active

040871819

ABSTRACT:
A plunger assembly for pressing together two smooth layers of material against a firm planar supporting surface without entrapping air between the layers. The assembly includes a soft resilient pad having adjacent surfaces disposed at an obtuse angle and meeting at a ridge. The pad is pressed against the material to first engage the ridge and then the adjacent surfaces progressively outwardly from the ridge to sweep air from between the layers of the material.

REFERENCES:
patent: 895577 (1908-08-01), McIntire
patent: 1780701 (1930-11-01), Crane
patent: 3510217 (1970-05-01), Cirimele et al.
patent: 3914775 (1975-10-01), Vogelgesang et al.

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