Tilt meter
Patent 4468864 Issued on September 4, 1984. Estimated Expiration Date: 
April 5, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 5, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2713726 3114209 Electronic circuit for sensing deviations in physical forces thereon Deflection measuring system Patent #: 4378693 InventorsAssigneeApplicationNo. 06/365261 filed on 04/05/1982US Classes:33/366.14, With pulse or digital processing circuit component33/1H, Earth33/366.12Plural nonparallel axes or plural orientation sensorsExaminersPrimary: Haroian, Harry N.Attorney, Agent or FirmInternational ClassesG01V 1/16 (20060101)G01C 9/00 (20060101) G01C 9/06 (20060101) AbstractA tilt meter comprises two tilt sensors (110 and 110S, see FIG. 7) in a housing (105). Each sensor acts as two variable resistors (Rs), which together with two fixed resistors (RF) form a Wheatstone bridge (25), driven by a square wave signal from a drive source (30). The output of the bridge is fed to an electronic circuit (35) which includes a synchronized switch (43) to cut out the spikes (50), which the bridge outputs at the transitions of the square wave. The output of the electronic circuit is a DC signal, whose amplitude indicates tilt magnitude and polarity indicates direction of tilt. The housing (105) is supported on a support surface (102S) by means of 15 legs (116, 117) threaded into nuts of the same metal, and which has a very low thermal coefficient of expansion. | |
