Method of manufacturing a book binding element

Details Method of manufacturing a book binding element Method of manufacturing a book binding element

1975-04-16

1977-02-15

Kucia, Richard R.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264230, 264299, 264328, B29C 700

Patent

active

040083055

ABSTRACT:
A novel ring binder for securing a plurality of perforated sheets in a loose-leaf fashion, wherein the ring element is generally circular and has a generally radial slit permitting it to open for the insertion of sheets, and wherein the terminal ends of the ring are each provided with radially inwardly directed projections whereby individual sheets of bound paper are restrained against ready removal from the ring; a novel method of manufacturing such rings is also provided.

REFERENCES:
patent: 2978532 (1961-04-01), Burnett
patent: 3433688 (1969-03-01), Staats
patent: 3455336 (1969-07-01), Ellis
patent: 3899564 (1975-08-01), Kessler
patent: 3917789 (1975-11-01), Heisler

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