Plumb-bob

Details Plumb-bob Plumb-bob

1991-10-28

1993-03-23

Will, Thomas B.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33347, G01C 1510

Patent

active

051952483

ABSTRACT:
The present invention relates to a plumb-bob and magnet combination for attachment to a beam. The plumb-bob and magnet combination for attachment to a beam includes a magnet having a top flat surface that is connected to the base, the magnet having two opposing sides that contain recesses, a hollow casing for encompassing a string of the plumb-bob and having a top surface slidable along the magnet, the hollow casing including lips on the top surface for sliding engagement with the recesses on the sides of the magnet, a lock on one of the lips of the casing and being cam operated by a lever that moves in the direction of an arc on the top surface of the casing for locking and unlocking the casing to the magnet, and a cantilever extending from the casing and having a free end with an aex from which the string hangs with a weight at the free end, the string being wound in the casing.

REFERENCES:
patent: 1080448 (1913-12-01), Honey
patent: 1230074 (1917-06-01), Perkins
patent: 1571687 (1926-02-01), O'Loughlin
patent: 1943017 (1934-01-01), Harris
patent: 2343688 (1944-03-01), Maxey
patent: 2729897 (1956-01-01), Smith
patent: 2794263 (1957-06-01), Cranmer
patent: 3068573 (1962-12-01), Sidwell
patent: 4319402 (1982-03-01), Martin
patent: 4442610 (1984-04-01), Owens, Jr.
patent: 4459761 (1984-07-01), Bosco

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