Michael C Harding
Security Companies and Guards in Lake Shore, UT
License number
Utah 298860-6302
Issued Date
Nov 5, 1990
Expiration Date
Nov 5, 1992
Category
Security Companies & Guards
Type
Armed Private Security Officer
Address
Address
Lake Shore, UT
Professional information
Method For Making Stress Sensors
US Patent:
5507090, Apr 16, 1996
Filed:
Jul 20, 1994
Appl. No.:
8/278028
Inventors:
John Shipley - Tremonton UT
Lloyd T. Johnson - Perry UT
Michael C. Harding - Spanish Fork UT
Boyd D. Bryner - Brigham City UT
Lloyd T. Johnson - Perry UT
Michael C. Harding - Spanish Fork UT
Boyd D. Bryner - Brigham City UT
Assignee:
Thiokol Corporation - Ogden UT
International Classification:
H01C 1728, B23P 1700
US Classification:
296211
Abstract:
A method for making a plurality of stress sensors includes creation of cavities and corresponding diaphragms in a thin metal front plate, preferably by an acid etching process. A thin back plate, preferably comprising metal, is secured to the front plate over the cavities, preferably by welding. A plurality of strain gages is bonded to the diaphragms in the front plate with a layer of bonding agent such as epoxy. The bond layer is of substantially uniform thickness on at least that portion of the front plate where the diaphragms are located. As the bond layer cures, a magnetic force is applied to the diaphragms to reduce their movement toward the back plate, and to thereby assist in creating a bond layer of substantially uniform thickness near the diaphragms. A suitable magnetic force may be applied by positioning a rare earth magnet near the diaphragms. The magnetic force may be supplemented by a mechanical force.