US 4,231,145 A · Method and apparatus for attaching two objects

Abstract

Method and apparatus for attaching a transducer to an object having characteristics to be measured. At least two attachment elements each including a number of pointed members are interconnected by a sensing element. Each attachment element includes a movable wedge member and at least one fixed wedge member whereby initial movement of the movable wedge member with respect to the fixed wedge member subjects said pointed members to a pressure force of a specified magnitude to press the pointed members into the surface of the object. Further movement of the movable wedge member with respect to the fixed wedge member generates a holding force on the pointed members less than the initial pressure force to hold each attachment element in engagement with the object regardless of transverse forces acting on the attachment elements.

Claims7

Dependent claims

Method for attaching a deformation transducer to a measured object without creep, the transducer being arranged in a space between a plate clamped relative to the measured object, the deformation transducer having at least two attachments formed by a number of points or the like at each attachment and with a deformation-sensing element between the said attachments, comprising the steps of:

providing a normal force securing the transducer by a clamping force determined by mutually movable pressure surfaces included in each attachment, the points being pressed into the measured object to a depth determined by the pressure surfaces;
and
at least partially disengaging the pressure surfaces to reduce the clamping force to such a value that the stresses in the material in the measured object making contact with the surfaces of the points are reduced to such an extent below the yield point that an additional force from the deformation-sensing element perpendicular to the normal force cannot again increase the stress in the material of the measured object at the surfaces of the points to above the yield point.

Apparatus for attaching a transducer to an object having a characteristic to be measured, comprising:

at least two attachment elements each including a number of pointed members and interconnected by a sensing element of the transducer, each attachment element including a movable wedge member and at least one fixed wedge member;
and
means for manually moving said movable wedge member with respect to said fixed wedge member in at least two successive stages, the movement of said movable wedge member and said at least one fixed member during the first stage subjecting said pointed members to a pressure force of a specified magnitude causing said pointed members to be pressed into the surface of said object, movement of said movable wedge member with respect to said fixed wedge member during a successive stage of movement providing a holding force on said pointed members that is less than said initial pressure force to hold each attachment element in engagement with said object when said attachment elements are subjected to a force transverse to said holding force.

Dependencies are inferred from the claim text.

Method and apparatus for attaching two objects

Life of this patent

Method and apparatus for attaching two objects

Life of this patent

Abstract

Claims7