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Strain Gage Application Device

IP.com Disclosure Number: IPCOM000091159D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Lateur, GV: AUTHOR

Abstract

The strain gage application device comprises vacuum cup 10 having tension load adjustment screw 12 extending through closed surface 14 opposite the open side of cup 10. Coaxially surrounding screw 12 is tension spring 16 which is attached to threaded collar 18 and a mounting plate. Internal to cup 10 is one end of the screw 12 which supports button heater 20. This has in contact with it copper heater pad 22. The heater is pivotally supported to allow for small misalignments. A ball and socket support 23 can be provided. Through one lateral side of cup 10 extends vacuum port 24 to which a vacuum source is attached by vacuum line 26. Also extending through a lateral side of cup 10 are heater electrical contacts 28.

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Strain Gage Application Device

The strain gage application device comprises vacuum cup 10 having tension load adjustment screw 12 extending through closed surface 14 opposite the open side of cup 10. Coaxially surrounding screw 12 is tension spring 16 which is attached to threaded collar 18 and a mounting plate. Internal to cup 10 is one end of the screw 12 which supports button heater 20. This has in contact with it copper heater pad 22. The heater is pivotally supported to allow for small misalignments. A ball and socket support 23 can be provided. Through one lateral side of cup 10 extends vacuum port 24 to which a vacuum source is attached by vacuum line 26. Also extending through a lateral side of cup 10 are heater electrical contacts 28. Surrounding the opening in the open face of cup 10 is 0-ring seal 30 embedded in a groove formed in the open face. Mounted on one side of cup 10 is microswitch 32 which is connected in series to heater 20.

In use, a strain gage is prepared for application and supported on pad 22 by a thin coating of silicon grease. The application device is aligned with the workpiece to which the gage is to be applied and the vacuum source is connected to line 26. Pressure is applied to the strain gage during the heating and curing of the epoxy glue by rotating screw 12 to force it toward the workpiece and extend a greater portion of it into cup 10.

When pad 22 can no longer move toward the workpiece, collar 18 is pulled by the screw thread...