Marking plumb bob

Details Marking plumb bob Marking plumb bob

1996-04-08

1998-08-11

Fulton, Christopher W.

Geometrical instruments

Indicator of direction of force traversing natural media

Level or plumb, terrestrial gravitation responsive

33666, G01C 1510

Patent

active

057910618

ABSTRACT:
A marking plumb bob having a separable two-part body assembly defining a reservoir for containing dry marking material and containing a ball check valve mechanism produces a circular ring shaped marking pattern to indicate the set position of a plumb line relative to a reference surface. A biasing spring associated with the check valve mechanism moves within the reservoir to agitate the marking material contained therein each time the ball check valve mechanism operates.

REFERENCES:
patent: 668998 (1901-02-01), Napier
patent: 995872 (1911-06-01), Joice
patent: 1949652 (1934-03-01), McLaws
patent: 2795053 (1957-11-01), Wohlstrom
patent: 3113387 (1963-12-01), Bean, Jr.
patent: 5157843 (1992-10-01), Barcewski
patent: 5299598 (1994-04-01), Quartana, III et al.

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