Mechanically locked bell and spigot coupling for ducts and metho

Details Mechanically locked bell and spigot coupling for ducts and metho Mechanically locked bell and spigot coupling for ducts and metho

1977-03-28

1978-08-29

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

138109, 156157, 156250, 285423, 285DIG20, B65H 8100, F16L 3708

Patent

active

041101448

ABSTRACT:
A bell and spigot coupling is provided with an abrasive-material insert to increase the disengagement force necessary to uncouple the ducting.

REFERENCES:
patent: 2420778 (1947-05-01), Herold
patent: 2702716 (1955-02-01), Basolo et al.
patent: 3252192 (1966-05-01), Smith
patent: 3623930 (1971-11-01), Grosh
patent: 3661670 (1972-05-01), Pierpont, Jr.
patent: 3775207 (1973-11-01), Harmon

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