JPH0330819Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention relates to a tensile testing machine for tensile testing a test piece, and in particular to an extensometer for measuring the elongation of the test piece. .

(b) Prior art Figure 3 shows a conventional extensometer. This extensometer has upper and lower levers 1H and 1L, and
Levers 1H and 1L are provided at two gauge points set at intervals in the length direction of the TP, respectively, and the levers 1H and 1L are connected to a strain sensing plate 2. The sensing plate 2 has a strain gauge attached thereto, and the strain gauge is connected to a lead wire 3. Furthermore, each lever 1 is
H and 1L are connected, levers 1H and 1L are test pieces
They are maintained at intervals corresponding to the gauge length of the TP. Therefore, attach the levers 1H and 1L to the test piece TP, and attach the gauge 4 to the levers 1H and 1L.
When the test piece TP is removed from 1L and a tensile load is applied in the length direction of the test piece TP using the loading mechanism of the tensile testing machine, when an elongation occurs between the gauge points in the length direction of the test piece TP, the levers 1H and 1L follows it and is displaced relatively. Therefore, distortion occurs in the sensing plate 2. As a result, the test piece T.
The lengthwise elongation of P is taken out. Furthermore, the strain of the sensing plate 2 is detected by a strain gauge, and the elongation of the test piece TP is measured.

In this type of extensometer, when attaching the levers 1H and 1L to the test piece TP, a spindle 6 and a pair of edges 5L and 5R are usually installed at each gauge position of the test piece TP, as shown in FIG. , a pair of edges 5L and 5R at each gauge point position are arranged to face each other. A method is adopted in which the test piece TP is sandwiched between a pair of edges 5L and 5R at each gauge point. Of the pair of edges 5L and 5R at each gauge position, the right edge 5R is fixed to the levers 1H and 1L, and the left edge 5L is fixed to the spindle 6. The spindle 6 and the levers 1H and 1L are arranged substantially on the same axis. Further, the spindle 6 is fitted into a sleeve 7 and guided so as to be movable in the axial direction. Further, the knob 8 is screwed onto the thread 9 of the sleeve 7, and a compression spring 10 is provided between the knob 8 and the spindle 6. Then, attach holder 1 to sleeve 7.
1 is attached, and the hook 12 of the holder 11 is engaged with the edge 13 of the levers 1H and 1L.
Therefore, the compression spring 10 acts on the spindle 6, and the edge 5L of the spindle 6 moves against the levers 1H, 1.
It is elastically biased toward the edge 5R of L. As a result, the pair of edges 5L and 5R at each gauge point are pressed against the test piece TP, and the test piece TP is sandwiched between the edges 5L and 5R. As a result, the levers 1H and 1L are attached to the test piece TP.

However, levers 1H and 1L of this extensometer
To attach the test piece TP, first press lever 1.
H, 1L edge 5R is brought into contact with the test piece TP. Then, the edge 5L of spindle 6 was used as a test piece.
TP and engage the hook 12 of the holder 11 with the edge 13 of the levers 1H and 1L. Thereafter, the elasticity of the compression spring 10 must be adjusted by rotating the knob 8 so that the test piece TP is sandwiched between the pair of edges 5L and 5R at each gauge point. This had to be repeated for each test, and the operation was not easy. Also, when the knob 8 is rotated with the test piece TP sandwiched between the pair of edges 5L and 5R at each gauge position, the compression spring 1
0, a twisting force is applied to the test piece TP by the spindle 6 and its edge 5L. There was also the problem that this affected test values.

(c) Purpose Therefore, the purpose of this invention is to simplify the operation of attaching the lever of the extensometer to the test piece, and to prevent twisting force from acting on the test piece, thereby solving the above-mentioned conventional problems. It has been done.

(d) Configuration According to this invention, in a tensile testing machine having a loading mechanism that applies a tensile load in the longitudinal direction of a test piece, two gage points set at intervals in the longitudinal direction of the test piece are used. A lever, a spindle, and a pair of edges are respectively provided, the pair of edges at each of the gauge points are arranged opposite to each other, and one edge of the pair of edges at each gauge point is fixed to the lever; The other edge is fixed to the spindle, the spindle and lever at each gage position are arranged substantially on the same axis, the spindle and lever at each gage position are connected to each other, and the spindle and lever at each gage position are connected to each other. The edge of the spindle is elastically biased toward the edge of the lever, and the test piece is sandwiched between a pair of edges at each of the gage positions, thereby attaching the lever at each gage position to the test piece. , an extensometer of a type in which the elongation in the longitudinal direction of the test piece is taken out by levers at each of the gage positions, a pair of holders being provided between the spindle and the lever at each of the gage positions, The spindle is supported by one holder of the pair of holders at the gauge positions, the other holder is fixed to the lever, and the pair of holders at each gauge position are held substantially the length of the test piece. The holders are connected to each other so as to be openable and closable around an axis parallel to the direction, and an elastic spring and a stopper are provided between the pair of holders at each of the gage points, and the elastic springs at each gage position connect the holders to the pair of holders. holder is elastically biased in the closing direction, and the closing movement of the pair of holders is restricted by the stopper at each of the gauge positions, whereby the spindle and lever at each of the gauge positions are substantially the same. An extensometer for a tensile testing machine is provided, characterized in that it is arranged on an axis.

(e) Examples Examples of this invention will be described below. FIGS. 1 and 2 show an embodiment of this invention. This extensometer is equipped with a lever 1H similar to that shown in Figures 3 and 4.
1L, spindle 6, sleeve 7, compression spring 10
and a knob 8.

Furthermore, spindle 6 and lever 1 at each gauge position
A pair of holders 14L and 16 between H and 1L, respectively.
The holders 14L and 14R are made of flat plates bent in an L shape, and the spindle 6 and the lever 1
It is arranged between H and 1L, and is connected so as to be openable and closable around a pin 15 parallel to the test piece TP. Then, the left holder 14L is fixed to the sleeve 7, and the sleeve 7 and spindle 6 are fixed to the holder 14L.
The other holder 14R is supported by the lever 1.
It is fixed at H, 1L. Further, a torsion spring 1 is inserted between the pair of holders 14L and 14R at each gauge position.
6 and a stopper 17 are provided. A torsion spring 16 is arranged around the pin 15 and engaged with a pair of holders 14L and 14R at each gage position,
The holders 14L and 14R are elastically biased in the closing direction. Stopper 17 is holder 14L, 14R
It is fixed to the right holder 14R and is in contact with the left holder 14L. This allows spindle 6 and lever 1 to
H and 1L are arranged substantially on the same axis.
Further, the holders 14L and 14R have operation ends 18L and 18R suitable for operation by an operator with one hand.

In this extensometer, the operating ends 18L, 18R of the pair of holders 14L, 14R at each gauge point are connected to the second
When operated in the direction of the arrow in the figure, the holders 14L and 14R are guided by the pin 15, the left holder 14L swings counterclockwise, and the right holder 14
R swings clockwise. Therefore, pin 15
The holders 14L and 14R are opened using the spindle 6 and the edges 5 of the levers 1H and 1L as fulcrums.
L and 5R are opened and the interval between them is expanded. Therefore, the test piece TP can be placed between the pair of edges 5L and 5R at each gauge position.

After that, the operation end 18 of the holder 14L, 14R
When L and 18R are released, the torsion spring 16 acts on the pair of holders 14L and 14R at each gauge point,
The pair of holders 14L, 14R at each gauge point position is closed using the pin 15 as a fulcrum, and the spindle 6 and the edges 5L, 5R of the levers 1H, 1L are closed. Therefore, a pair of edges 5 at each gauge position
L and 5R contact the test piece TP. Furthermore, the compression spring 10 acts on the spindle 6, and the edge 5L of the spindle 6 is moved to the edge 5R of the levers 1H and 1L.
It is elastically biased towards. Therefore, the pair of edges 5L and 5R at each gauge point are pressed against the test piece TP, and the test piece T is pressed between the edges 5L and 5R.
P. is caught. As a result, lever 1H,
1L is attached to the test piece TP.

Also, the pair of edges 5L and 5R at each gauge point contact the test piece TP, and the spindle 6 and lever 1
When L and 1R are arranged on the same axis, the left holder 14L comes into contact with the stopper 17, and the pair of holders 14L and 14R at each gauge point position is held at that position. Therefore, the pair of edges 5L and 5R at each gauge point are pressed against the test piece TP on the same axis, and the levers 1H and 1L are accurately moved against the test piece TP.
can be attached to.

Therefore, this extensometer has holders 14L, 14
By simply operating the operating ends 18L and 18R of R, the levers 1H and 1L can be easily attached to the test piece TP. It is also possible to operate the operating ends 18L, 18R of the holders 14L, 14R with one hand. Furthermore, when adjusting the elasticity of the compression spring 10,
A test piece is placed between a pair of edges 5L and 5R at each gauge position.
There is no need to rotate knob 8 while holding the TP. Operate the operation ends 18L and 18R of the holders 14L and 14R with your right hand, and then turn the spindle 6
Separate the edge 5L from the test piece TP. and,
By rotating the knob 8 with the left hand, the elasticity of the compression spring 10 can be adjusted. After that, the holder 14
Release the operating ends 18L and 18R of L and 14R, and insert the test piece between the pair of edges 5L and 5R at each gauge position.
Just put the TP in between. Therefore, there is no problem that the compression spring 10 and the edge 5L of the spindle 6 exert a torsional force on the test piece TP, which affects the test value, as in the prior art.

(f) Effects As explained above, this invention can simplify the operation of attaching the lever to the test piece. It is also possible to prevent torsional force from acting on the test piece, thereby achieving the intended purpose.

[Brief explanation of the drawing]

Figure 1 is a side view showing an embodiment of this invention, Figure 2 is a sectional view of Figure 1, Figure 3 is a side view of a conventional extensometer, and Figure 4 is a sectional view of Figure 3. be. 1H, 1L... Lever, 5L, 5R... Edge, 6... Spindle, 14L, 14R... Holder, 15... Pin, 16... Torsion spring, 17...
...Stoppa, TP...test piece.

Claims (1)

[Scope of utility model registration request] In a tensile testing machine having a loading mechanism that applies a tensile load in the length direction of a test piece, a lever, a spindle, and a pair of edges are respectively provided at two gauge points set at intervals in the length direction of the test piece. , a pair of edges at each of the gauge points are arranged opposite to each other, one edge of the pair of edges at each gauge point is fixed to the lever, and the other edge is fixed to the spindle; The spindle and lever at each gage position are arranged substantially on the same axis, and the spindle and lever at each gage position are connected to each other, and the edge of the spindle at each gage position is directed toward the edge of the lever. The test piece is sandwiched between a pair of edges at each of the gage positions, thereby attaching the lever at each gage position to the test piece, and the lever at each gage position is applied to the test piece. The extensometer is of a type that measures the elongation in the length direction of the test piece, and a pair of holders are provided between the spindle and the lever at each of the gauge positions, and among the pair of holders at each of the gauge positions, The spindle is supported by one holder, the other holder is fixed to the lever, and the pair of holders at each gage position are arranged around an axis in a direction substantially parallel to the length direction of the test piece. and an elastic spring and a stopper are provided between the pair of holders at each of the gauge points, respectively.
The pair of holders are elastically biased in the closing direction by the elastic springs at each of the gauge positions, and the closing movement of the pair of holders is restricted by the stopper at each of the gauge positions, thereby An extensometer for a tensile testing machine, characterized in that the spindle and lever at each of the gage positions are arranged substantially on the same axis.