Magnet keeper assembly method

Patent metadata

Field	Value
Publication number	US-2016203909-A1
Application number	US-201615062560-A
Country	US
Kind code	A1
Filing date	Mar 7, 2016
Priority date	Sep 8, 2014
Publication date	Jul 14, 2016
Grant date	—

Abstract

A magnet assembly ( 200 ) is provided that comprises a magnet keeper ( 204 ) configured to hold at least one magnet ( 202 ). The bracket ( 208 ) is configured to receive the magnet keeper ( 204 ) and also configured to be attachable to a flowmeter ( 5 ) sensor assembly ( 10 ). A first surface ( 216 ) is formed on the magnet keeper ( 204 ), and a second surface ( 218 ) is formed on the bracket ( 208 ), wherein the first and second surfaces ( 216, 218 ) are configured to mate so to provide a radial alignment of the magnet keeper ( 204 ) that is within a predefined radial tolerance range.

First claim

We claim:

1 . A method of forming a magnet assembly, comprising the steps of:
threading a magnet keeper to define a first threaded region; threading a bracket that is configured to be attachable to a flowmeter sensor assembly to define a second threaded region, wherein the second threaded region is configured to engage the first threaded region; forming a first surface on the magnet keeper proximate the first threaded region; forming a second surface on the bracket proximate the second threaded region, wherein the second surface is configured to engage the first surface when the magnet keeper is threaded to the bracket so to provide a radial alignment of the magnet keeper that is within a predefined radial tolerance range; forming a third surface on the magnet keeper proximate the first threaded region; and forming a fourth surface on the bracket proximal to the bracket's threads, wherein the fourth surface is configured to engage the third surface when the magnet keeper is threaded to the bracket so to provide a radial alignment of the magnet keeper that is within a predefined radial tolerance range.

2 . The method of forming a magnet assembly of claim 1 , wherein the second surface is disposed proximate a distal end of the bracket.

3 . The method of forming a magnet assembly of claim 1 , wherein the predefined radial tolerance range is between about 0.0 inches and 0.002 inches.

4 . The method of forming a magnet assembly of claim 1 , wherein the first surface and second surface comprise a first set of mating diameters.

5 . The method of forming a magnet assembly of claim 4 , wherein the third surface and fourth surface comprise a second set of mating diameters.

6 . The method of forming a magnet assembly of claim 5 , wherein the first set of mating diameters are smaller than the second set of mating diameters.

7 . The method of forming a magnet assembly of claim 1 , comprising the steps of:
forming a first thread relief in the bracket disposed proximate a distal end of the threads; and forming a second thread relief in the bracket disposed proximate a proximal end of the threads.

8 . The method of forming a magnet assembly of claim 1 , comprising the step of forming a travel stop on the bracket.

9 . The method of forming a magnet assembly of claim 8 , comprising the step of forming a locating face on the magnet keeper configured to engage the travel stop to provide an axial alignment of the magnet keeper that is within a predefined axial tolerance.

10 . The method of forming a magnet assembly of claim 9 , wherein the predefined axial tolerance is between about 0.0 inches and 0.005 inches.

Assignees

• Micro Motion Inc

Inventors

• Skinkle David
• Mertens Terri J

Classifications

• H01F7/0205

  Magnetic circuits with PM in general · CPC title

• H01F41/0253 Primary

  for manufacturing permanent magnets · CPC title

• G01F1/8422 Primary

  exciters · CPC title

• G01F1/8413

  means for influencing the flowmeter's motional or vibrational behaviour, e.g., conduit support or fixing means, or conduit attachments · CPC title

• F16L37/24

  in which the connection is made by inserting one member axially into the other and rotating it to a limited extent, e.g. with bayonet-action · CPC title