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Adjustable torque on Electrical and Mechanical tuning slugs.

IP.com Disclosure Number: IPCOM000020288D
Original Publication Date: 2003-Nov-10
Included in the Prior Art Database: 2003-Nov-10
Document File: 2 page(s) / 57K

Publishing Venue

Motorola

Related People

Ole Maymann: AUTHOR

Abstract

This paper describes the problems with backlash, detuning and not optimal torque on treaded tuning slugs. A method for no backlash, no detuning when lock and adjustable torque is described.

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TITLE:

Adjustable torque on Electrical and Mechanical tuning slugs.

By: Ole Maymann

Abstract.

This paper describes the problems with backlash, detuning and not optimal torque on treaded tuning slugs. A method for no backlash, no detuning when lock and adjustable torque is described.

Introduction.

The standard added extra nut always shows tendency to both axial and rotational detuning when fastened.

Also in many situations, the predefined ( if any ) torque feeling is either too high or too low.

Problem To Be Solved.

If such a device should work satisfactory, there must be no backlash, no detuning rotational or axial, a way to start with easy tuning, and an adjustable higher torque when peaking.

Known lock nuts have a torque and lock curve, from free to locked within a few degrees of turning the lock nut. The graph showing torque versus turning angle on this is shown on fig. 1

Finally there must be a way to lock efficient for bumping and vibrating.

Proposed Solution to the Problems.

To solve the detuning problem, the torque added to the shaft must be radial for adjusting and locking. See fig. 2.

To solve the problem, the graph showing torque versus turning angle on lock nut, should be changed from shown on fig. 1, to as shown on fig. 3.

This problems is solved by adding a chamber around the shaft with 4, 6 or 8 equally spaced, carefully shaped springs pressing radial against the shaft. See fig. 4.

When adjusting the adjust/lock nut cw or ccw, the springs are pressed more or le...