Hardness testing machine
OwnerJoseph Trevor Sidawayinventor
Life of this patent
Estimating the term…
Abstract
A hardness testing machine comprises an indenter mounted on one end of a lever. A workpiece clamp is mounted on a further lever to engage the same face of the workpiece as is engaged by the indenter. A piston andcylinder unit is arranged to transfer to the indenter lever a load normally borne by the clamp lever so that load on the workpiece is unchanged. Movement of the indenter arising from the temporary application of the additional load is amplified and applied to a dial gauge.
Claims9
In a hardness testing machine having a support for an object which is to be tested, an indenter which, in use, forms an indentation in the object, an indenter lever on which the indenter is mounted and a mechanism for urging the indenter against the object under test, the improvement wherein the indenter lever is arranged for applying a preliminary load to the indenter to urge same against the object, said mechanism includes means for exerting an additional load on the indenter and the machine further comprises a clamp for applying a load substantially equal to the additional load to an object on the support prior to application of the additional load to the indenter, and means operative for transferring said applied additional load from said clamp to said indenter and thereby applying the additional load by the indenter to the object and relieving the object of the load applied thereto by the clamp.
In a hardness testing machine having a support for an object which is to be tested, an indenter which, in use, forms an indentation in the object, an indenter lever on which the indenter is mounted, the lever being pivotally supported about a fulcrum and said indenter being fastened adjacent an end of the lever, a mechanism for urging the indenter against the object under test, means for applying a preliminary load to the indenter lever to urge the indenter against the object, said mechanism including means for exerting an additional load on the indenter lever, an indicator for indicating the magnitude of a movement of the indenter when said additional load is exerted on said indenter lever, and means connected between said indicator and a point on said indenter lever, said point being located between said fulcrum and said indenter and at a distance from said indenter
In a hardness testing machine having a support for an object which is to be tested, an indenter which, in use, forms an indentation in the object, a mechanism for urging the indenter against the object under test and an indicator for indicating the magnitude of a movement of the indenter, the improvement wherein the machine includes an indenter lever on which the indenter is mounted for movement about a fulcrum of the indenter lever and means for transmitting to the indicator motion of the indenter lever at a position spaced longitudinally of the indenter lever from the indenter, said means for transmitting motion to the indicator comprising a further lever coupled to said indenter lever and coupled also to the indicator, said further lever having a probe arranged for engagement with that surface of an object on the support which is also engaged by the indenter, whereby movement of said surface is transmitted to said further lever.
Dependencies are inferred from the claim text.