Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive
Patent
1992-09-30
1994-11-29
Fulton, Christopher W.
Geometrical instruments
Indicator of direction of force traversing natural media
Level or plumb, terrestrial gravitation responsive
33332, G01C 504
Patent
active
053677820
ABSTRACT:
A level marking method including providing a hose having a first end and a second end; filling the hose, at least partially, with a liquid so as to form a water head; leaving the first end of the hose open to atmospheric pressure; closing the second end of the hose by airtightly fixing a pressure sensor to the second end of the hose near the water head; connecting a solenoid inker having an inking level to the pressure sensor, said solenoid inker being operated by ON and OFF signals dispatched from the pressure sensor and automatically drawing a mark at the inking level when it operates; configuring the hose so as to define a reference level by obtaining a reference level pressure value from the pressure sensor; arranging said pressure sensor such that it dispatches an ON signal at the reference level, and dispatches an OFF signal otherwise; and marking the level by vertically displacing the second end of the hose so as to cause the pressure sensor to dispatch an ON signal.
REFERENCES:
patent: 4231163 (1980-11-01), Turloff
patent: 4434561 (1984-03-01), Gaspar
patent: 4536968 (1985-08-01), Lopiccolo
patent: 4669484 (1987-06-01), Masters
patent: 5001926 (1991-03-01), Delignieres
"Koredakewa Shitte Okitai Kenchiku Kohji No Sumidashi No Jitsumu", by Hisao Hamamatshu & Tatsuo Naito; first published Jun. 5, 1981 (English Translation provided).
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