Title: Protractor with digital readout

Abstract: A protractor having a sine bar connected to the shaft of an electronic encoder and supported to a carriage movable axially and horizontally, but retained in fixed relationship to a table supporting a propeller for measuring and inspecting the blade angles thereof is characterized by its improved accuracy and repeatability.

Do you think this is a good invention? Vote now:

Votes so far: For:(0) Against:(0)
Other info:

Inventors: Joyal, George J. (Chicopee, MA, US)
Gakeler, George H. (Vernon, CT, US)

Application Number: 498820
Filing Date: 1974-08-19
Publication_date: 1976-12-14
Assignee: United Technologies Corporation (Hartford, CT)
Primary Class(es): 33/530 33/1PT, 33/538
Other Classes:
US Patent Ref:

2000926	May, 1935	Cox	33/75.
2359018	Sep, 1944	Balk	33/174.
2369425	Feb, 1945	Becker	33/174.
2397300	Mar, 1946	Tilton	33/174.
2481062	Sep, 1949	Anderson	33/75.
3195410	Jul, 1965	Colten et al.	33/174.
3816930	Jun, 1974	Edenholm	33/174.

Other Refs: 915,226

Jan, 1963	UK

Primary Examiner: Aegerter, Richard E.
Assistant Examiner: Phillips, Charles E.
Attorney: Del Ponti; John D., Friedland; Norman