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US 4,858,475 AGranted
Apparatus and method for measuring strain
AssigneeRevere Corporation of America
InventorsWalter E. Jacobson, Donald J. Summers, Kenneth Vining, Frederick E. Jackson
Life of this patent
Estimating the term…
Abstract
Apparatus and method for measuring strain on a pin with one or more strain gage elements disposed within an open-ended axial bore formed in the pin, wherein the strain gage element or elements is or are mounted on a plug that is inserted into the bore with an interference fit.
Claims11
Apparatus for measuring strain in a structure, including, in combination,
- (a) a pin adapted to constitute an element of the structure and to be subjected to the strain to be measured, said pin having a generally cylindrical axial bore opening through one end of the pin;
- (b) at least two strain gage elements;
- and
- (c) a plug for mounting said strain gage elements within the bore, said plug being inserted endwise into the bore with an interference fit and having two opposed parallel flat side surfaces, on which said strain gage elements are mounted, each of said flat side surfaces having at least one of said strain gage elements mounted thereon, and both of said flat side surfaces being shaped and disposed to enable said strain gage elements to enter the bore with clearance when the plug is introduced into the bore, said plug having the shape of a cylinder with opposite side portions cut away to provide said flat side surfaces such that there are opposed arcuate side surface portions between said flat side surfaces, and the maximum diameter of said plug between said opposed arcuate side surface portions before insertion of the plug in the bore being greater than that of the bore in the region of the bore at which the plug is disposed after insertion, each of said arcuate side surface portions being formed with multiple longitudinal grooves to enable insertion of the plug in the bore with an interference fit as aforesaid.
1 more element
Apparatus for measuring strain in a structure, including, in combination,
- (a) a pin adapted to constitute an element of the structure and to be subjected to the strain to be measured, said pin having a generally cylindrical axial bore opening through one end of the pin;
- (b) at least two strain gage elements;
- and
- (c) a plug for mounting said strain gage elements within the bore, said plug being inserted endwise into the bore with an interference fit and having two opposed parallel flat side surfaces, on which said strain gage elements are mounted, each of said flat side surfaces having at least one of said strain gage elements mounted thereon, and both of said flat side surfaces being shaped and disposed to enable said strain gage elements to enter the bore with clearance when the plug is introduced into the bore, said plug having opposed longitudinally grooved cylindrical end portions dimensioned for interference fit with said bore and a central portion of rectangular cross section extending between said end portions.
1 more element
Dependencies are inferred from the claim text.