JPS637887Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a Charpy impact tester for testing the toughness and brittleness of various industrial materials against impact forces.

As shown in FIG. 1, the Sharpie impact tester 1 has a hammer 4 having a rotating shaft concentric with the pointer shaft 3 of the indicator 2, and the hammer 4 is allowed to fall freely from a predetermined swinging angle and then supported. The test piece W placed on the stands 5, 5 is broken by impact. In this testing machine 1, the energy required for this breakage is determined from the swinging angle of the hammer 4 after the breakage, and the Shapey impact value of the test piece W is measured.
The swing-up angle corresponding to the energy required for this breakage is indicated by the indicator 2.

By the way, this testing machine 1 has conventionally been used as shown in Fig. 2a.
As shown in the figure, it has a pair of support stands 5, 5 which have a predetermined gap P and are arranged at the same height.
A test piece W having a rectangular cross section is placed on these supports 5,
It is supported in a state where it is in contact with the horizontal support part 6 and the vertical support part 7 of 5, and is broken by the hammer 4 passing through the gap P.

Therefore, the test piece W after being broken falls downward through the gaps Q, Q between both sides 4a of the hammer 4 and the end surface 5a of the support base 5, as shown in FIG. 2b. Become.

However, this breaking test piece W rotates when falling downward, and if it has a rectangular cross section as described above, there is a risk that it will get caught in the gaps Q, Q.

That is, the hammer 4 may be displaced laterally due to long-term use, causing so-called lateral vibration. If this lateral vibration occurs after the impact, the end surface of the support base 5
The gap Q between a and the side surface 4a of the hammer 4 widens. The fracture test piece W rotates within this expanded gap Q, but since the length of the diagonal of the test piece W, which has a rectangular cross section, is longer than the length of one side, this long part is caught in the gap Q. Become. If this pinching occurs, not only will the lateral vibration of the hammer become even larger, but there is a risk of damaging the side surfaces of the hammer 4 and the support stand 5, and there is a risk of reducing the reliability of the testing machine.

In addition, in the prior art, the test piece W is bent without being broken by the hammer strike, passes through between the supports while being caught by the hammer, and after the hammer is swung up, it is swung back. Sometimes, a member is attached to the support stand to prevent the test piece W from being caught in the gap between the support stand and the hammer (see Japanese Utility Model Publication No. 53-8374), but this However, the rotation of the fracture test piece cannot be prevented, and the above-mentioned pinching cannot be prevented.

The present invention has been developed in view of the above-mentioned points, and is a Sharpie impact tester that prevents the breaking test piece from rotating when it falls and does not trap the breaking test piece between the support stand and the hammer. The purpose is to provide

The present invention has been made to achieve the above-mentioned purpose, and its structure is such that the falling and rotational movement of a broken test piece is placed on each support base below the support surface of the horizontal support section on the side through which the hammer passes. It is characterized by the provision of a pedestal to prevent this.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a plan view of essential parts showing an embodiment of the present invention, and the same members as those shown in FIGS. 1 and 2 are given the same reference numerals.

The support stands 5, 5 in this Shalpy impact tester 10 have a gap P between which the hammer 4 passes, but the gap Q between the end surface 5a of the support stand 5 and the side surface 4a of the hammer 4 is It has a pedestal 11.

As shown in FIG. 3, this pedestal 11 is attached to the part of the horizontal support part 6 of the support 5 on which the test piece is placed, and extends along the end surface of the vertical support part 7, as shown in FIG. In addition, in a side view, as shown in FIG. 4, when the fractured test piece W falls on this support stand 5, the position is such that it does not rotate, that is, the support surface 6a of the horizontal support part 6. It is provided at a position separated by a smaller distance R.

This pedestal 11 is composed of a plate material having an L-shaped cross section, and the upright piece 11a is attached to the end surface of the pedestal 5 with screws 12.
The horizontal piece 11b protrudes so as to fill the gap Q, and protrudes to such an extent that its tip does not come into contact with the side surface 4a of the hammer 4. Therefore, as is clear from FIG. 3, the gap Q has become a small gap S.

Next, the operation of the above-described embodiment will be explained.

When the test piece W is placed on the support stand 5 and the hammer 4 is allowed to fall freely from a predetermined swinging angle, the test piece W is broken by the hammer 4.

However, in this embodiment, since the pedestal 11 is attached to the end face of the support 5, the fracture test piece W rests on the pedestal 11 in a slightly rotated state after cutting, and the force applied when cutting is As a result, it slides on this pedestal 11 and is released from this testing machine 10 to the outside.

Therefore, the risk of the breaking test piece W being caught between the hammer 4 and the support base 5 is prevented.

In the above embodiment, the end of the pedestal 11 is extended horizontally, but if it is tilted downward as shown by the two-dot chain line in FIG. 5, the fracture test piece W can be released to the outside. This will improve your sexuality.

As is clear from the above explanation, according to the present invention, each support stand below the support surface of the horizontal support part on the side through which the hammer passes is provided with a cradle to prevent the fracture test piece from falling and rotating. Therefore, after the fracture test piece is prevented from falling and rotating on the pedestal, it is guided outside.
Break tests and test piece removal can be carried out smoothly. Further, it is possible to reliably prevent the energy loss of the hammer due to the pinching of the fracture test piece and the lateral vibration of the hammer, as in the conventional case.

[Brief explanation of drawings]

Figure 1 is a front view of a conventional Shapey impact tester, Figures 2a and b are plan views showing the state of the test piece before and after fracture, and Figure 3 is an embodiment of the Shapey impact tester according to the present invention. 4 is a side view of FIG. 3, and FIG. 5 is a view taken along the line - in FIG. 4. 4...hammer, 4a...side, 5...support stand,
6...Horizontal support part, 6a...Support surface, 7...Vertical support part, 10...Sharpie impact tester, 11...
...cradle, P, Q, S...gap, R...distance, W...
…Test pieces.

Claims (1)

[Scope of utility model registration request] A pair of support stands each consisting of a horizontal support part and a vertical support part are placed at the same height with a predetermined gap, a test piece is supported between both support stands, and the test piece is moved with a free-falling hammer. In the Shapey impact tester which is designed to break, on the end face of each support base below the support surface of the horizontal support part on the side through which the hammer passes, extending along this end face and contacting the side surface of the hammer passing through. Provide a cradle that protrudes so as to fill the above gap so as not to touch,
A Sharpie impact testing machine characterized by being able to prevent a broken test piece from falling and rotating.