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US 4,810,148 AGranted
Drain bolt
AssigneeIshikawa Tekko Kabushiki Kaisha
InventorsJunzo Aisa, Eizi Kosugi
Life of this patent
Estimating the term…
Abstract
A drain bolt wherein a recess is formed at the end of a male-threaded portion of a bolt body, and a sinker portion of a synthetic resin magnet is embedded in the recess of the bolt body so that a projecting portion of the magnet is projected from the end of the male-threaded portion of the bolt body. The projecting portion of the synthetic resin magnet is larger in diameter than the sinker portion. A plurality of grooves are formed on the side of the projecting portion of the synthetic resin magnet along its length.
Claims6
A drain bolt comprising:
- a bolt body consisting of a male-threaded portion and a head portion, the male-threaded portion having a recess formed at the end thereof;
- and
- a synthetic resin magnet consisting of a sinker portion and a projecting portion;
- wherein the sinker portion is embedded in the recess of the bolt body with the projecting portion projecting from the end of the male-threaded portion of the bolt body, and
- wherein a pair of grooves is formed on the side of the projecting portion of the synthetic resin magnet along its length so that the two grooves are symmetrical with respect to the center of the projecting portion and the synthetic resin magnet is magnetized in such a manner that the two grooves have opposite magnetic polarities.
2 more elements
Dependencies are inferred from the claim text.