Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1997-05-13
1999-11-02
Fulton, Christopher W.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33398, G01C 1510
Patent
active
059746769
ABSTRACT:
A plumb bob assembly including a plumb bob for use adjacent to a wall or other vertical surface, a cord, cord spool attachable to the plumb bob for storage and a tip cover. A pencil may be inserted through a vertical slot in the plumb bob body to mark the position of the plumb bob relative to an adjacent wall. The plumb bob has a relatively flat, tear-drop shaped plastic body, to which two disk-shaped brass weights, a brass cord attachment ball and a conical brass tip are attached. A plastic spool has a cord receiving region defined by two walls and a plate that protrudes beyond one of the walls. Opposed hooks on the plate provide a means for tying-off the cord and hanging the plumb bob assembly from a nail during use. A collar on the plate locks the spool on the plumb bob during storage by inserting the plate into the slot in the plumb bob body.
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Photograph of plumb bobs from The 1994 American Woodworker Calendar, .COPYRGT.1993.
Beall Jerrold R.
McGuire John S.
Fulton Christopher W.
Lee Valley Tools Ltd.
Pratt John S.
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