Abstract: A combination of a unique test block and a modification of the anvil on a hardness testing machine wherein the combination enables the testing block to easily and quickly align with the indenter of the hardness testing when said testing block is placed on the hardness testing machine's anvil. At least one spring-loaded ball detent is provided that enables the test block to be positioned using one of a plurality of dimples on said testing block. A cradle is provided when a double-sided test block is used to keep the surface of the test block from being marred when said testing block is placed on the anvil. An alternative embodiment uses more than one detent on the anvil which keeps the test block from rotating while the test block is on the anvil.

Abstract: A portable Brinell testing apparatus that meets the load time requirements of the ASTM E10 standard. The invention uses a constant force spring connected to a lever arm which is pivoted on fulcrum 32. The mechanical advantage of the mechanism is able to achieve a force of up to 3000 Kgf with constant force spring 26 that can be activated by the operator.

Abstract: A portable testing apparatus for a Brinell test meeting the load time requirements of the ASTM E10 standard. The apparatus incorporates a hydraulic accumulator acting on a cylinder which is connected to an indenter. The accumulator keeps a constant force on the indenter for the period of time of the test despite hydraulic leakage or creep of the indenter into the material that would cause a reduction in pressure if not for the accumulator. Usually, the test time length is 10 seconds. Pressure is set using springs usually in a settable sequence valve.

Abstract: A hardness test block wherein the number of test sites is optimized for a given test block size and a hardness being tested. The hardness test block has an alignment template that enables an operator to be assured of having the test bock grid pattern aligned properly with the indenter of a hardness testing machine. Another means for aligning the test block with the hardness testing apparatus is a cradle for the test block so that the primary test surface as well as the opposite surface can both be used for testing purposes such that the cradle protects the test surface from being contacted by the anvil of the hardness testing machine during the test operation. Another alternative is having a plurality of legs or pins on the test surface of the test block to prevent the test surface from contacting the anvil when the opposite test surface is being used for testing.

Abstract: A portable Brinell testing apparatus that meets the ASTM E10 standard. Prior art attempts do not work because as the force is applied, the indenter travels into the material causing the springs to extend; therefore, lowering the load applied. The invention uses a constant force spring connected to a lever arm which is pivoted on a fulcrum. The mechanical advantage of the mechanism is able to provide a force of up to 3000 kg with a constant force spring that can be activated by the operator.

Abstract: A portable testing apparatus for a Brinell test meeting the load time requirements of the ASTM E10 standard. The apparatus incorporates a hydraulic accumulator acting on a cylinder which is connected to an indenter. The accumulator keeps a constant force on the indenter for the period of time of the test despite hydraulic leakage or creep of the indenter into the material that would cause a reduction in pressure if not for the accumulator. Usually, the test time length is 10 seconds. Pressure is set using springs usually in a settable sequence valve.

Abstract: Centering devices are provided for use with Brinell hardness measuring instruments, particularly electro-optical probes, which include one or more illumination sources in a housing having an aperture at one end which is aligned with an optical axis of the probe to provide the optics a view of the specimen surface opposite the opening. In one embodiment, a spider-like centering structure is provided protruding through the probe end opening. The centering structure directs light from source in the probe directly into an indentation in a specimen surface engaging the centering structure and prevents light from crossing the indentation and reducing edge contrast. A mask further prevents spillage of light from each source onto the specimen surface adjoining the indentation and the source so as to heighten contrast differences between the bright surface of the indentation and the dark surrounding specimen surface.

Abstract: A centering device for Brinell hardness-measuring instruments includes an alignment member positioned at the opening of the instrument providing a field of view to the optics within the instrument. A central portion of the alignment member protrudes through the instrument opening and is hemispherically configured to mate with a circular Brinell penetrator indentation in the specimen surface. The central portion of the alignment member is open to freely pass light axially through the alignment member. The alignment member is preferably spring supported within the instrument to permit the alignment member to partially retract into the instrument and the working face of the instrument to be positioned against the specimen. A switch is provided responsive to movement of the alignment member to activate a light source in the instrument.