Displacement extensometer

12031,816

17/626948

July 16, 2019

The present invention relates to a displacement extensometer for measuring the linear displacement of an object to be measured, the displacement extensometer comprising: a first bracket installed at a reference point so as to provide support force; a second bracket fixed to an object to be measured; a displacement meter body fixed to the first bracket and including a center rod connected to the second bracket, so as to detect displacement while the center rod horizontally moves according to positions of the object to be measured; a first link connecting the displacement meter body to the first bracket; a second link connecting the center rod of the displacement meter body to the second bracket; and a friction compensation member provided in the displacement meter body so as to compensate for the friction due to sagging of the center rod while providing physical stress to the center rod.

EDS Co., Ltd. (Incheon, KR)

1. A displacement extensometer measuring a linear displacement of a measurement object, the displacement extensometer comprising: a first bracket installed at a reference point to provide a supporting force; a second bracket fixed to the measurement object; a displacement meter body fixed to the first bracket, including a center rod connected to the second bracket, and detecting a displacement as the center rod is horizontally moved according to a position of the measurement object; a first link connecting the displacement meter body with the first bracket; a second link connecting the center rod of the displacement meter body with the second bracket; and a friction compensation member provided in the displacement meter body and providing physical stress to the center rod to cancel a frictional force due to sagging of the center rod, wherein the friction compensation member includes at least one vibration motor built in the displacement meter body, connected to the center rod, and vibrating the center rod in a preset period.

2. The displacement extensometer of claim 1 , further comprising: a first fixing member detachably fixing the first bracket to the reference point; a second fixing member detachably fixing the second bracket to the measurement object; and a centering member guiding the first bracket to be horizontal with the second bracket while visually guiding an installation position of one of the first bracket and the second bracket to the other.

3. The displacement extensometer of claim 1 , wherein the displacement meter body includes: a displacement meter housing having a first end connected with the first link and a second end having a withdrawal hole through which the center rod is drawn out; a load plate fixed to the center rod while being movably built in the displacement meter housing and horizontally moving along with the center rod; a plurality of guide rods installed along a length direction of the displacement meter housing to movably guide the load plate; return springs provided on the guide rods and elastically compressed by a movement of the load plate and returning the load plate to an original position; a plurality of solenoid coils built in the displacement meter housing, positioned outside the center rod, and generating a magnetic field; and a magnetic body installed in the center rod, positioned between the solenoid coils, and providing, along with the solenoid coils, to an electrical output according to the displacement while moving along with the center rod, and wherein the vibration motor is attached to the load plate and operates to vibrate the load plate.

4. The displacement extensometer of claim 1 , wherein the second link includes an invar wire connected to the second bracket; and a turnbuckle connecting the invar wire and the center rod and adjusting an interval between the invar wire and the center rod.

5. The displacement extensometer of claim 1 , wherein the first link includes a first fork fixed to the first bracket; a second fork fixed to the displacement meter body while being orthogonal to the first fork; and a tilting block provided between the first fork and the second fork to allow tilting in upper and lower directions and left and right directions of the displacement meter body.

4094189 June 1978 Serata
5563349 October 1996 Burke
5819428 October 1998 Meyer
20170030701 February 2017 Saxey
10-2002-0005291 January 2002
10-0763795 October 2007
10-2012-0093382 August 2012
10-1317629 October 2013
10-2015-0025853 March 2015
10-1794127 November 2017
10-1967957 April 2019
10-2002814 October 2019

English Specification of 10-2002-0005291. cited by applicant
English Specification of 10-1317629. cited by applicant
English Specification of 10-2015-0025853. cited by applicant
English Specification of 10-2002814. cited by applicant
English Specification of 10-2012-0093382. cited by applicant
English Specification of 10-0763795. cited by applicant
English Specification of 10-1794127. cited by applicant
English Specification of 10-1967957. cited by applicant

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