Patent ID: 11906482
Assignee: CORNING INCORPORATED
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. An apparatus for testing edge strength of a sheet of material comprising:
a plurality of assemblies configured to selectively applying a 3-point bending load along an edge of the sheet of material in a test region of the apparatus, whereby the plurality of assemblies can establish a loaded condition on the sheet of material in the test region by applying the 3-point bending load and establish a no-load condition on the sheet of material in the test region by not applying the 3-point bending load, wherein a pattern provided on the surface of the sheet in the test region facilitates optically measuring the strain in the sheet of material;
wherein the plurality of assemblies comprises two opposing assemblies for applying the 3-point bending load, wherein a first of the two opposing assemblies comprises a single arcuate member for engaging a first side of the sheet and a second of the two opposing assemblies comprises two spaced-apart arcuate members for engaging a second side of the sheet opposite the first side, wherein the two spaced-apart arcuate members define the test region between the two spaced-apart arcuate members;
a linear cam representing a linear map of the 3-point bending load along the edge of the sheet of material, wherein the linear cam is configured to move linearly in synchronization with the sheet of material; and
a follower that rides on the linear cam, wherein the follower is connected to the single arcuate member to vary the 3-point bending load on the sheet of material as the sheet of material moves through the test region.