JP3775292B2 - Extensometer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an extensometer for mounting on a test piece and measuring its elongation when performing a tensile test or the like of the test piece with a material testing machine.
[0002]
[Prior art]
In an extensometer for mounting on a test piece and measuring its elongation at the time of a material test such as a tensile test, generally, a predetermined distance (distance between gauge points) is separated from the surface of the test piece by a predetermined distance. Two edges are brought into contact with each other, and the elongation of the test piece is measured from the relative displacement between the two edges.
[0003]
FIG. 5 is a schematic plan view (A) and a front view (B) of a configuration example of a conventional extensometer, respectively. Edges 53a and 53b are attached to the ends of two arm portions 52a and 52b extending in the same direction from the extensometer body 51, and locking portions 54a and 54b are integrally formed on both sides of each edge 53a and 53b. Has been.
[0004]
On the other hand, gripping tools 55a and 55b corresponding to the edges 53a and 53b are prepared separately. The gripping tools 55a and 55b movably support the pressing members 57a and 57b at the center of the U-shaped frames 56a and 56b in plan view, and the pressing members 57a and 57b are compressed by the compression coil springs 58a and 58b in FIG. ), And hooks 59a and 59b are formed at both ends of the frames 56a and 56b.
[0005]
In order to attach the extensometer described above to the test piece TP, the gripping tools 55a and 55b are positioned via the test piece TP for each of the edges 53a and 53b, and against the elastic force of the compression coil springs 58a and 58b. The hooks 59a and 59b are hooked on the locking portions 54a and 54b. As a result, the edges 53a and 53b and the pressing members 57a and 57b opposite to the edges 53a and 53b are pressed against the front and back surfaces of the test piece TP by the elastic force of the compression coil springs 58a and 58b, and the extensometer is attached to the test piece TP. It is done.
[0006]
[Problems to be solved by the invention]
By the way, according to the conventional extensometer as described above, in order to attach to the test piece TP, the two gripping tools 55a are provided so that the extensometer body 51 is supported with one hand and the test piece TP is sandwiched with the other hand. , 55b must be attached to the upper and lower engaging portions 54a, 54b one by one, and the attaching operation is not easy and takes time. Further, in the tensile test, it is generally necessary to remove the extensometer immediately before the test piece TP is broken, but it takes time to remove the extensometer as well.
[0007]
This invention is made | formed in view of such a situation, and it aims at provision of the extensometer which can be easily attached to a test piece by one touch.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the extensometer of the present invention is attached to the test piece in a state where the edges are in contact with the two locations of the test piece, and measures the elongation of the test piece between the two edges. In an extensometer, an edge that comes into contact with one surface of a test piece, a gripping part that is attached to a common member with the edge so as to face the edge, and touches the other side of the test piece, and these edges and gripping parts A pair of springs for generating an elastic force in a direction in which the edge and the gripping part approach each other to generate a gripping force, and a pair for separating the edge and the gripping part against the elastic force of the spring Two pairs of edge mechanisms consisting of knobs are attached to the main body at a predetermined distance, and the respective tips of the two pairs of edge mechanisms approach each other so that they can be operated with one hand. Characterized by that.
[0009]
According to the present invention, two sets of edge mounting mechanisms having a common member attached to the edge and the gripping portion are provided, and a knob which is a manual operation portion of each edge device mechanism is brought close to a distance that can be operated with one hand. To achieve the objectives of the period.
[0010]
That is, in the present invention, the edge and the gripping part are attached to a common member without being separated as in the prior art, and an edge mounting mechanism is configured with a spring that generates a gripping force. The tip of the knob, which is the operating part that separates the gripping part from the elastic force of the spring, is brought close to the tip so that it can be operated with one hand. It is possible to operate the gripping part opposite to the test piece with one hand, and the mounting on the test piece is greatly facilitated as compared with the conventional case.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a plan view thereof, and both are shown in a state of being attached to a test piece TP. FIG. 3 shows an exploded perspective view of one edge mounting mechanism 3a together with the main part of the arm 2a. FIG. 4 is a view of the moving side frame 6a of one edge mounting mechanism 3a as viewed in the direction of arrow A in FIG.
[0012]
The extensometer body 1 is provided with two arms 2a and 2b protruding from the displacement sensing portion inside thereof, the base ends of which are respectively connected to the arm 2a and 2b. 3b is attached. The displacement sensitive part may be either one that attaches the arms 2a and 2b so as to be inclined and is sensitive to the spread angle thereof, or one that is attached so that the arms 2a and 2b approach or separate from each other and is sensitive to the slide amount. Good.
[0013]
The edge mounting mechanisms 3a and 3b include edges 4a and 4b fixed to the arms 2a and 2b, fixed frames 5a and 5b fixed to the arms 2a and 2b, and hinge pins 7a and 5b to the fixed frames 5a and 5b. The movable side frames 6a and 6b are rotatably supported via 7b, and the torsion springs (winding springs) 8a and 8b supported by the hinge pins 7a and 7b.
[0014]
The fixed side frames 5a and 5b are formed with long holes H along the longitudinal direction of the arms 2a and 2b, and the long holes H are formed on the male screws S (see FIG. 3) formed to protrude from the arms 2a and 2b. The nut 2 is fixed to the arms 2a and 2b by screwing the nut N into the male screw S in a state in which the nut 2 is positioned in the longitudinal direction of the arms 2a and 2b at a position corresponding to the thickness of the test piece TP.
[0015]
The fixed side frames 5a and 5b and the movable side frames 6a and 6b are integrally formed with knobs 91a, 91b and 92a, 92b for manual operation, respectively. These knobs 91a, 91b and 92a, 92b are , Respectively, extend toward the counterpart frame 5b, 5a or 6b, 6a, and their tips approach each other so that all the knobs 91a, 91b and 92a, 92 are in one hand.
[0016]
The torsion springs 8a and 8b have shapes including two projecting portions 82a and 83a, 82b and 83b projecting laterally from both ends of the coil portions 81a and 81b, and the coil portions 81a and 81b are hinge pins 7a and 7b, respectively. Is supported by being plugged into. One projecting portion 82a, 82b of each torsion spring 8a, 8b extends to a position facing the edges 4a, 4b to form a grip portion, and the other projecting portion 78a, 83b is hooked on the fixed side frame 5a, 5b. It has been. The elastic force of the torsion springs 8a and 8b is exerted in the direction indicated by the arrow F in FIG. 2, that is, the direction approaching the edges 4a and 4b, as shown in FIG. Accordingly, the protruding portions 82a and 82b forming the gripping portion are always biased toward the edges 4a and 4b.
[0017]
The protrusions 82a and 82b that form the gripping portions are fitted in the grooves G formed in the moving frames 6a and 6b. Therefore, when the knobs 92a and 92b of the moving side frames 6a and 6b are rotated around the hinge pins 7a and 7b toward the knobs 91a and 91b of the fixed side frames 5a and 5b, one of the torsion springs 8 forming the gripping portion is formed. The protrusions 82a and 82b move against the elastic force of the torsion springs 8a and 8b in the direction indicated by the arrow R in FIG. 2, that is, away from the edges 4a and 4b.
[0018]
In order to mount the above embodiment of the present invention on the test piece TP, as described above, the knobs 92a and 92b of the moving frames 6a and 6b are turned manually to the knobs 91a and 91b of the fixed frames 5a and 5b. By moving, one of the protrusions 82a and 82b of the torsion springs 8a and 8b forming the grip part is moved away from the edges 4a and 4b, and in this state, the test piece TP is placed between the edges 4a and 4b and the protrusions 82a and 82b. After the pin is sandwiched, by releasing the hand, it is attached to the test piece TP by the elastic force of the torsion springs 8a and 8b. Further, in order to remove the embodiment of the present invention attached to the test piece TP, the knobs 92a and 92b of the moving frames 6a and 6b are manually moved to the knobs of the fixed frames 5a and 5b in the same manner as described above. By rotating to the 91a, 91b side, one protrusion 82a, 82b of the torsion springs 8a, 8b forming the gripping portion may be removed away from the edges 4a, 4b.
[0019]
In the above mounting / removing operations, the tips of the knobs 91a and 92a of the upper edge mounting mechanism 3a approach the knobs 91b and 92b of the lower edge mounting mechanism 3b, and all the knobs enter into one hand. Thus, a total of four knobs 91a, 92a, 91b, 92b of the upper and lower edge mounting mechanisms 3a, 3b can be operated with one hand.
[0020]
The detailed structure of the extensometer of the present invention is not limited to that described in the above embodiment, and the equivalent function may be replaced by another mechanism. It is only necessary that the knob for operating the mounting mechanism of the two edges is close to a position where it can be operated with one hand.
[0021]
【The invention's effect】
As described above, according to the present invention, an edge mounting mechanism in which an edge and a gripping portion biased by a spring opposite to the edge are attached to a common member is attached to an extensometer body, and the two sets thereof Since the knobs, which are the operation parts of the edge mounting mechanism, are brought close to each other so that they can be operated with one hand, it is possible to open and close the two edges and the corresponding gripping parts with one hand. Compared to the total, it is possible to achieve the simplification of the attaching / detaching operation to the test piece and the reduction of the required time at the same time.
[Brief description of the drawings]
FIG. 1 is a front view of an embodiment of the present invention, and shows a state where the test piece is attached to a test piece.
2 is a plan view of FIG. 1. FIG.
FIG. 3 is an exploded perspective view showing one edge mounting mechanism 3a together with the main part of an arm 2a in the embodiment of the present invention.
4 is a view of the moving side frame 6a of one edge mounting mechanism according to the embodiment of the present invention as viewed in the direction of arrow A in FIG.
FIG. 5 is a schematic plan view (A) and a front view (B) showing a configuration example of a conventional stretched diameter.
[Explanation of symbols]
1 Extensometer body 2a, 2b Arm 3a, 3b Edge mounting mechanism 4a, 4b Edge 5a, 5b Fixed frame 6a. 6b Movement side frames 7a, 7b Hinge pins 8a, 8b Torsion springs 81a, 81b Coil portions 82a, 82b Protruding portions (gripping portions)
91a, 91b, 92a, 92b Knob TP test piece

Claims (1)

In an extensometer for measuring the elongation of a test piece between two edges, which is attached to the test piece in a state where the edges are in contact with two places of the test piece,
An edge that comes into contact with one surface of the test piece, a grip portion that is attached to a common member with the edge so as to face the edge, and touches the other surface of the test piece, and a grip between the edge and the grip portion A spring that generates an elastic force in a direction in which the edge and the gripping part approach to generate a force, and a pair of knob parts that separate the edge and the gripping part against the elastic force of the spring Two sets of edge mounting mechanisms are mounted on the main body at a predetermined distance, and the tip portions of the two sets of edge mounting mechanisms are close to each other so that the knobs of the two sets of edge mounting mechanisms can be operated with one hand. An extensometer characterized by that.

Images