Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1991-08-07
1992-07-07
Will, Thomas B.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33379, 33388, 33390, G01B 928, G01B 934
Patent
active
051271672
ABSTRACT:
A multi-function spirit-level adapted for use as inclination indicators for different specific slopes comprising a central conventional spirit level bubble tube attached at each distal end to a rectangular member with no support or other structure therebetween. The rectangular members are positioned normal to the central bubble tube. One of the rectangular members has a greater surface area than the other. The rectangular members are positioned at the ends of the bubble tube so that their four narrow outer surfaces are parallel. The bubble tube is centered on one of the rectangle members and positioned off center on the other. The offset position of one end of the bubble tube allows the spirit level to measure four different slope angles by resting the rectangular members on each of their four different outer parallel surfaces. Visible indica on the top of at least one of the rectangular members indicates the discrete slope angle of each of the pair of parallel surfaces when those surfaces are resting on an item whose slant angle is to be measured is expected to be an opposite and equal slanting indication angle. The bubble tube has at least a pair of spaced apart markers between which the bubble is positioned when one of the selected discrete slope angles is achieved. When the slope angle is not exact user interpretation or other bubble tube indicators determines the approximate slope angle of the surface that is being slope angle checked. A shirt pocket clip is attached to one exterior surface of one of the rectangular members for removable attachment to the users pocket for ease of transport.
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Gilliam Frank D.
Will Thomas B.
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