Patent · US Expired

Pitch measuring apparatus

US4559714A · kind A · utility

8Cited by
10References
6Claims
0Family size

Inventor

Key dates

Filing dateFeb 15, 1983
Grant dateDec 24, 1985
Priority date—
Expiry dateFeb 15, 2003

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01C9/24
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

A pitch measuring device for measuring the deviation of one line or plane from a referenced line or plane. The device comprises a pitch vial including a cavity containing a liquid and a bubble hermetically sealed therein. Indicia, pre-calibrated to the axis of the vial body, are applied to the vial body to provide a visual display of the amount of pitch of a measured surface by reference to bubble position in the vial cavity in relation to the body indicia. The vial cavity is symmetrically disposed about the vial axis with a larger radius at one end than at the other of the vial to provide pre-selected bubble orientation in response to selected pitch conditions.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.