Plug for sealing preservative in wood

Details Plug for sealing preservative in wood Plug for sealing preservative in wood

1991-02-20

1992-05-19

Marcus, Stephen

Bottles and jars

Closures

Stopper type

215247, 220229, 47 575, 217 95, B65D 3908

Patent

active

051140322

ABSTRACT:
The invention provides a plug for sealing substances in holes drilled in wood. The plug has a body of generally circular cross section and a thread portion helically wound around the body between inner and outer end portions thereof. The thread portion has a leading face facing towards the inner end portion and a trailing face facing towards the outer end portion, the leading face being inclined at a shallower angle to a central axis of the body than the trailing face. The plug can be driven into the hole by hammering, but is extracted from the hole by unscrewing in a normal manner. The thread portion is designed to permit relatively easy movement into the hole without rotation, but requires rotation for extraction from the hole. Preferably, the thread portion is flexible and the thread portion is within a shallow conical periphery. The outer end portion has a recess to receive a complementary driver to rotate the plug for extraction.

REFERENCES:
patent: 1999458 (1935-04-01), Hollister
patent: 2099370 (1937-11-01), Monnier
patent: 2436291 (1948-02-01), Daniel
patent: 2492176 (1949-12-01), O'Connor
patent: 3221920 (1965-12-01), Buys
patent: 3487442 (1969-12-01), Rossman
patent: 3589550 (1971-06-01), Rossman
patent: 3834075 (1974-09-01), Nix et al.
patent: 3944114 (1976-03-01), Coppens
patent: 3968594 (1974-08-01), Kawakami
patent: 4005799 (1977-02-01), Mannaerts
patent: 4643825 (1987-02-01), Weslowski
patent: 4724793 (1986-09-01), Sletten
patent: 4833824 (1989-05-01), Cronenwett et al.

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