Stabilized locking mechanism for threaded tuning screws in waveg

Details Stabilized locking mechanism for threaded tuning screws in waveg Stabilized locking mechanism for threaded tuning screws in waveg

1976-05-03

1977-08-09

Borchelt, Archie R.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

333 97R, 333 98R, H01P 120, H01P 706, H01P 128

Patent

active

040414213

ABSTRACT:
A threaded invar tuning screw extending through the threaded aperture of an invar bushing in the broad wall of a waveguide filter presents a capacitance inside the waveguide. This capacitance is varied by changing the depth of the screw in the waveguide in order to tune the filter. A brass locknut on the screw has a truncated, conically shaped bottom that mates with a similarly shaped countersunk hole on the bushing, the conical bottom, countersunk hole, and screw being coaxial. The mating surfaces on the nut and the countersunk hole reduce lateral movement of the screw during tuning and fixing of the position of the latter by tightening the locknut against the bushing.

REFERENCES:
patent: 2527146 (1950-10-01), Mumford
Laughner et al., "Handbook of Fastening and Joining of Metal Parts," McGraw Hill, New York, 1956; Title page and pp. 153-156, 558-559.

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