Plumb bob

Details Plumb bob Plumb bob

1994-04-22

1995-11-28

Fulton, Christopher W.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33392, G01C 1510

Patent

active

054696330

ABSTRACT:
A plumb bob including an elongated body having a longitudinal axis and opposite ends on the longitudinal axis; a bore extending generally along the longitudinal axis; an elongated cord extending through one of the opposite ends into the bore; storage apparatus mounted on the body and connected to the cord and having a length of cord wound thereon, the storage apparatus including an overriding mechanism selectively operable in response to a force exerted on the elongated body in the direction of the longitudinal axis to allow the cord accumulated thereon to be played-out and upon release of the force to accumulate the cord thereon, and a locking mechanism positioned at the one end of the body adjacent the cord and selectively operable between a first position in engagement with the cord and a second position released from the cord.

REFERENCES:
patent: 1090015 (1914-03-01), Birchbauer
patent: 1349565 (1920-08-01), Ewing et al.
patent: 1357270 (1920-11-01), Bush
patent: 2492609 (1949-12-01), Worden
patent: 2714766 (1955-08-01), Saxon et al.
patent: 3027977 (1962-04-01), Knaus
patent: 3064356 (1962-11-01), Kruse
patent: 3442025 (1969-05-01), Mathiesen
patent: 3478438 (1969-11-01), Lazar
patent: 4459761 (1984-07-01), Bosco
patent: 4489500 (1984-12-01), Valat

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