Class 33/787 - Extensometer

Subclass of Class 33 - Geometrical instruments
Definition: Subject matter having means for measuring small degrees
No. of patents: 35
Last issue date: 05/06/2008

Number	Title	Issue Date
7367269	Blast movement monitor and method for determining the movement of a blast movement monitor and associated rock as a result of blasting operations A method for measuring the movement of boundaries between different portions of a heterogeneous rock body is disclosed. The method comprises placing a plurality of blast movement monitors 109 in a rock body prior to blasting and noting the position of each bl...	05/06/2008
7347003	Device to measure axial displacement in a borehole A device to measure minute displacement in rocks, including anchor deployment means, anchor registration means, and frame release means. Further including anchor units comprising a fixed anchor point, a reversible anchor actuator and a deployable anchor face capable...	03/25/2008
7222540	Wireline extensometer A new and useful wireline extensometer is provided that uses a tensioned cable extending between a supply spool and an anchor (e.g. of a type connected to a slope mass), measures movement of the cable to reflect movement of the anchor (e.g. due to movement of the sl...	05/29/2007
7178260	Measuring head A unit damper apparatus 18 is used as a damper apparatus 18 which absorbs an impact and a vibration conveyed from a contact 14 to a seesaw member 12, and a structure of this unit damper apparatus 18 is the structure which absorbs c...	02/20/2007
6938494	Load test machine A load test machine includes a base block, at least a pair of posts rising from the base block, a cross head spanning between the pair of posts, and an actuator mounted on the base block or the cross head. The actuator is able to apply a load on a test piece positio...	09/06/2005
6939036	Temperature-expansion indicator for siding panels A temperature indicator for a siding panel senses panel temperature and indicates on a graphic scale the corresponding effect of thermal expansion over differences in temperature. The temperature indicator can be various forms of contact thermometer, temperature str...	09/06/2005
6907677	Stable LVDT extensometer A new extensometer is disclosed that avoids prior art problems of drift and other problems from variations in temperature, humidity and other environmental factors. Two primary extensometer body parts each hold at one end specimen contact rods and at their other end...	06/21/2005
6367157	System for adjusting the track on motor vehicle wheels A telescoping bar includes a track pusher for adjusting and measuring the track on a motor vehicle's wheels. A pneumatic spring, housed within the telescoping bar, functions as an accumulator and applies expansion forces on either the two front wheels or ...	04/09/2002
6185833	Leaf thickness sensing device A leaf thickness sensing device (1) having mounting apparatus (9, 10) for flexibly mounting the device adjacent a leaf whose thickness is to be sensed, a leaf support element (4) coupled to the mounting apparatus, a displaceable leaf abutting (6) juxtapos...	02/13/2001
5819428	Extensometer structure An extensometer structure for an extensometer comprises a flexure assembly, a first extension arm and a second extension arm. The flexure assembly includes a first flexure defining a first plane and a second flexure defining a second plane. The second fle...	10/13/1998
5712430	Extensometer structure An extensometer structure for an extensometer includes a first extension arm, a second extension arm and a rigid support. A first hinge assembly joins the first extension arm to the rigid support. The first hinge assembly has a first pivot axis that allow...	01/27/1998
5699624	High-temperature extensometer The invention relates to an apparatus for the one-dimensional, highly precise measurement of extension at the surfaces of hot specimens. The working range extends from normal temperature to about 1800° C., but measurements are also possible up to 2300° ...	12/23/1997
5623768	Method for determining an extension of an object by means of an extensometer and extensometer for performing the method A method for determining an extension of an object with an extensometer, and an extensometer for performing the method, include two legs being movable in a spreading plane and each having one end connected to a joint and another end connected to the objec...	04/29/1997
5537754	Extensometer and support for an extensometer The extensometer comprises a basic body (18) which carries two tap legs (12) which abut a specimen (16) to be measured so as to be frictionally locked thereto. Due to the frictional contact, the tap legs (12) move relative to each other when the specimen ...	07/23/1996
5454174	Position setting device and securing arrangement for an extensometer An extensometer includes a first element and second element to be set at a predetermined distance apart, with a coupling for setting and holding the two elements at the predetermined distance apart. The coupling is movable by the action of a biasing force...	10/03/1995
5430953	Apparatus for detecting or measuring movements in geological formations and other massive structures Apparatus for detecting or measuring movements in geological and other formations and capable of carrying out such measurements on a three-dimensional basis. The apparatus has a housing acting as a support and an elongated arm, e.g., a stiff measuring rod...	07/11/1995
5379647	Hole elongation testing system A system for testing and measuring hole elongation or deformation in a test article. The system includes a frame, a bearing member, and a referencing arm. The frame has a receiving area adapted to receive a portion of a test article. The bearing member is...	01/10/1995
5345685	Strata movement indicator A strata movement indicator includes at least two lengths of suspension wire respectively for remote and near anchors locatable in the same borehole. Each wire carries a cylinder provided with indicator markings, the cylinders being moveable with respect ...	09/13/1994
4998825	Tire cord thermal analysis testing device and method Dimensional change in a tire cord (13) under thermomechanical stress is determined by a device (10) including an oven (12) for receiving and controlling the temperature of a preselected length of the cord (13), grips (14,15) for holding and selectively po...	03/12/1991
4967485	Electronic feeler gauge An electronic feeler gauge for measuring the dimension of a gap. A flexible base in the general shape or a shoehorn has a raised shoulder portion of greater thickness substantially along its rear half with a forwardly extending tab that acts as a stop. A ...	11/06/1990
4884456	High temperature extensometer system A high temperature extensometer system carries specimen contact rods of substantial length which pass through openings in a furnace to engage a specimen in such furnace. The rods are supported at the exterior of the furnace on a paralleogram linkage suppo...	12/05/1989
4879906	Vibration damped mounting for extensometer system An extensometer support system having vibration damping mountings for parts that have substantial mass and which are subjected to external vibrations. Such parts include counterweights for counterbalancing the extensometer and also the mounting for an ext...	11/14/1989
4823473	Extensometer for material testing machine An extensometer for measuring strain in a materials test speciment including a frame, a pair of arms each having one end for contacting a portion of the specimen and a remote end, and a noncontact sensor assembly mounted on the arms to measure change in d...	04/25/1989
4607531	Torsional-axial extensometer with additional restraint to limit unnecessary movements An extensometer assembly measures axial strain, torsional strain, and various combinations of these strains in a specimen on which the extensometer is mounted, through the use of two extensometers on opposite sides of the specimen coupled by a cross-beam....	08/26/1986
4567669	Blue top setting device A first rod includes a relative elevation scale and a first fluid container vertically adjustable with respect to the relative elevation scale to a position corresponding to a desired elevation relative to the base of the first rod, and a second rod inclu...	02/04/1986
4537082	Reference frame and hold-down support system for remote supported axial torsional extensometer A support system provides a stable reference frame to support an extensometer assembly that measures both axial and torsional strains in a specimen. The reference frame is made so that it will retain an optimal relationship between the specimen and the te...	08/27/1985
4527335	Averaging axial-diametral strain measuring extensometer An extensometer is used for measuring axial and diametral strains in a material test specimen. The extensometer comprises an assembly of extensometer sections positioned on diametrally opposite sides of the specimen with specimen engaging points spaced ax...	07/09/1985
4514905	Convergence extensometer for measuring mine roof subsidence An extensometer for measuring changes in the vertical distance between the roof and floor of a mine opening which comprises; a pair of rigid telescoping members, a tension spring securing said members to each other in a telescoping relationship, a hook fo...	05/07/1985
4336657	Position sensor A position sensor comprising a movable member functionally connected with an operative device and moving in response to a positional displacement of the operative device, a displacement-pulse phase conversion unit including a magnetically soft amorphous m...	06/29/1982
4275599	Sensor for measuring dynamic variations in strain A sensor for measuring dynamic variations in axial strain in a cable wherein a light source is positioned intermediate a pair of light detectors. The sensor is capable of sensing the effects of dynamic axial tensile and compressive forces in the cable ove...	06/30/1981
4211013	Gauge A gauge suitable for use with specimens of various lengths provides very accurate measurement of small changes in the length of a given specimen....	07/08/1980
4170068	Apparatus for transmission of measuring motion in gauging equipment A gauging frame for transmitting measuring movements comprises two bar elements allowing components to be mounted thereto individually and each independently of other components by engagement with the bar element transversely thereof....	10/09/1979
4133303	Hemostatic catheter and method A hemostatic catheter having an elongated shaft of elastic material, and an inflatable balloon adjacent a distal end of the shaft. The catheter measures longitudinal expansion in a portion of the shaft when force is applied against the catheter to provide...	01/09/1979
4093954	Motion recorder indicator A recorder-indicator which mechanically magnifies strain or movement using special flex pivots. The lever system is activated by the motions being recorded or observed. A pointer indicates the strain or movement. It also marks or scribes a record of maxim...	06/06/1978
4020681	Portable strain gauge A portable strain gauge for measuring stress in a bar. The instrument includes a pair of spaced magnetic bases that magnetically adhere to the bar. A pair of mounting pads may be firmly strapped to the bar at suitable spacing in order to mount the bases i...	05/03/1977

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Class 33/787 - Extensometer