JPH0240519Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a test jig for supporting a rod-shaped test piece having a bulge in the middle for tensile or bending tests.

[Prior art and its problems]

As shown in FIG. 5, for example, a hollow rod-shaped ferrule 1 is used as a connector for connecting an optical cable. Tensile tests and bending tests are generally performed to ensure the rigidity of the material. Conventionally, when conducting these tests, a jig that chucks the small diameter portion 1b is generally used as a test jig to support the test piece (that is, ferrule) 1, but since the size of the ferrule is generally small, the chuck type With a jig, it is difficult to provide support with a constant mounting state, and therefore test conditions change and errors tend to occur in the test results. Also,
Support hole 2a into which test piece 1 is inserted as shown in FIG.
It is also practiced to make a hole in the test jig 2 and fix the test piece 1 in the support hole 2a with an adhesive 3. Arrow P indicates the load of the bending test. In this method, the test piece is mounted in a constant state, but the work of mounting the test piece becomes extremely complicated. Since it is necessary to test the strength of ferrules in large quantities, it is desirable to be able to test the strength of ferrules more easily.

In view of the above-mentioned drawbacks of the conventional technology, this invention conveniently and easily supports a test piece in tensile or bending tests of parts such as optical cable connector ferrules.
The purpose of this invention is to obtain a test jig that can be carried out so that the mounting state is always constant.

[Means for solving problems]

In this invention, in order to solve the above problem, a small diameter support hole and a large diameter support hole are provided in which the small diameter part on one end side of the test piece and the middle enlarged part are inserted, and the test piece is moved toward the large diameter support hole. A pair of screw holes were provided that penetrated diagonally from the insertion side, and a threaded stopper screwed into the screw holes pressed the shoulders of the enlarged portion of the attached test piece.

[Effect]

The test piece is supported by a radial force in the small-diameter support hole and the large-diameter support hole, and the shoulder of the ampullae is pressed by a threaded stopper to position it in the longitudinal direction and prevent it from coming off.

〔Example〕

An embodiment applied to a test jig for an optical cable connector ferrule will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a plan view of the test jig, and FIG. 2 is a front view thereof. This test jig 10 has a T-shaped main body formed by a bottom part 11 and a vertical part 12, has a notch 13 for fixing on the bottom part 11 and both sides, and has a test piece (ferrule) at the top of the vertical part 12. A small-diameter support hole 14 is drilled through which the small-diameter portion 1b of the specimen 1 can be inserted and removed without any play, and a large-diameter support hole 15 is formed at one end of the small-diameter support hole 14 into which the enlarged portion 1a of the test specimen 1 can be inserted. A raised portion 16 is formed on both sides of the large-diameter support hole 15, and each raised portion 16 has a pair of holes formed diagonally toward the large-diameter support hole 15 and penetrating through the large-diameter support hole 15. A screw hole 17 is drilled.

The state in which test piece 1 is attached is shown in Figure 3.
After inserting the test piece 1, a threaded stopper, in this embodiment a simple bolt 18, is screwed into the threaded hole 17, and its end surface is brought into contact with the shoulder 1c of the enlarged portion 1a.

Test jig 10 equipped with test piece 1 as described above
is placed on the stand 19a of the testing machine 19 as shown in FIG.
It is fixed to a stand 19a with a bolt 20 inserted through a notch 13 in the bottom part 11, and a hook 21, for example, is attached to a load stand part 19c that moves up and down guided by a guide rod 19b to apply a load, and this hook 21 is hung on the test piece 1. . In this way, by raising the load platform 19c and applying a load, a bending test is performed on the test piece 1.
The test piece 1 has a small diameter support hole 14 and a large diameter support hole 1.
The upward load from the testing machine 19 is supported at the portion 5. Then, the bolt 18 that is screwed diagonally from the test piece insertion side, that is, from the right side in FIGS. Piece 1 is always tested in a constant mounting condition.

The above example is a case of performing a bending test, but
Since the bolt 18 supports the longitudinal force acting on the test piece 1, it is also possible to apply the present invention to a tensile test. In this case, the small diameter support hole 14,
The direction of the large diameter support hole 15 is formed upward.

Further, in the embodiment, the test piece is a ferrule of an optical cable connector, but other test pieces can be used as long as they are rod-shaped test pieces that have a bulge in the middle.

〔effect〕

As explained above, according to the present invention, the shoulder of the enlarged part of the test piece inserted into the small diameter support hole and the large diameter support hole is held down by the threaded stopper screwed diagonally from the test piece insertion side. because there is,
The test piece is always supported by this test jig in a fixed state. Therefore, when testing a large number of test pieces, it is possible to perform the test under the same conditions, and the reliability of the test results is increased. Furthermore, the test piece can be attached and removed by simply slightly tightening or loosening the threaded stopper, which is extremely simple, and is particularly effective when testing a large number of test pieces.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, in which Figure 1 is a plan view of the test jig, Figure 2 is a front view of the same, and Figure 3 is a sectional view taken along the - line in Figure 2. , FIG. 4 is an explanatory diagram of a bending test state, FIG. 5 is a perspective view of an example of a test piece to be tested, and FIG. 6 is an explanatory diagram of a conventional example. 1... Test piece (ferrule), 1a... Ampulla,
1b...Small diameter part, 1c...Shoulder part, 10...Test jig, 14...Small diameter support hole, 15...Large diameter support hole,
16...Protuberance, 17...Screw hole, 18...Bolt (threaded stopper).

Claims (1)

[Scope of utility model registration request] A test jig for supporting a rod-shaped test piece 1 having an enlarged part 1a in the middle part for a tensile or bending test, and a small-diameter support hole into which a small-diameter part 1b at one end of the test piece is inserted. 14, and the test piece 1 is formed on the test piece insertion side of this small diameter support hole 14.
a large-diameter support hole 15 into which the enlarged portion 1a is inserted; a pair of screw holes 17 that are diagonally drilled and penetrated from at least two opposing directions toward the large-diameter support hole 15 on the test piece insertion side; A test jig comprising a threaded stopper 18 that is screwed into a screw hole 17 and comes into contact with a shoulder 1c of an enlarged portion 1a of an inserted test piece 1.