JPS5933845B2 - hardness tester - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hardness tester, particularly to an improvement in the test value of a rubber hardness tester.

Conventionally, a tester used to check the presence or absence of pointer deviation 30 due to a change in the elastic modulus of an annular spring or spring built into a rubber hardness meter has a machine base, as schematically shown in Figure 1a. A rubber hardness tester 4 is placed on a pedestal 3 whose height can be adjusted with fixing screws 2 on the machine 1, with the indenter 5 facing upward. A presser bar 9 is slidably attached to the through hole T, one end of which abuts the presser needle 5, and the other end of the presser bar 9 has a weight supporter 8 having a specific hardness. Three types of weights: 1st weight 10, 2nd weight 11
By adding and subtracting the third weight 12 in combination, loads can be applied to the pusher needle 5 in three stages.For example, when the first weight (255 g) is applied 10, the load is 250.
When the second weight (2001) 11 is combined with the first weight 10, it corresponds to a hardness of 500, and the third weight (4009) 12 is added to the first to second weights 1O, Il.
When added to the VC combination, the loads correspond to a hardness of 750, and these loads result in a hardness of 25
The condition of the pointer of the hardness meter 4 at each hardness point of 0, 500, and 750 is checked.

By the way, firstly, this conventional tester is time-consuming because it requires adding and subtracting a combination of several types of weights when applying a load, and secondly, measurement errors occur due to the frictional resistance applied to the presser bar 8. Thirdly, the hardness meter structure has changed from an annular spring type to a spring type (Figure 1 b) and has become larger, so it cannot be attached to the tester without removing the cap 13 each time during testing. Various problems remained unresolved. The present invention was made to solve the above problems, and has the following characteristics:
The height of the pedestal is adjustable, and the height of the pedestal is adjustable relative to the indenter of the hardness meter on the pedestal, and A load lever is provided which is pivotally supported to be able to swing up and down and comes into contact with the pusher needle when swinging downward, and the weight of this load lever is equal to the load corresponding to the lowest hardness among the specific hardnesses. By moving and placing one weight at a plurality of desired positions, it is possible to apply a load corresponding to a specific hardness in several stages.

The present invention will be explained in detail below with reference to the drawings.

In FIGS. 2 and 3 showing one embodiment of the present invention, a base 20
A step-shaped pedestal 23 is arranged on the top, and the pedestal 23
consists of a fixing part 21 and a sliding part 22 that can slide in the direction of the arrow with respect to the fixing part 21, and 24 is a fixing screw.

According to the pedestal of this embodiment, it is possible to test three types of hardness meters with different heights. Note that A in the figure is the test position.
A support 25 is erected on the base 20, and a load lever 26 is pivotally supported on this support 25 so as to be able to swing up and down, and when the lever 26 is pivoted downward, the pusher needle 27 is placed upwardly on the pedestal 23 in a horizontal state. It comes into contact with the indenter 27 of the hardness meter 28, which is placed facing the other direction, via a weight receiving plate 29.

A bearing is used for the pivot point. The weight receiving plate 29 is integrally provided with a protrusion 30, and has a through hole 31 bored at the A position of the load lever 26 (for example, at a distance of 70 mm from the pivot point).
The protrusion 30 is inserted through and fixed with a nut 32, and the protrusion 30 is in contact with the pusher needle 27. Furthermore, the B position of the load lever 26 (for example, a distance of 137 mm from the pivot point)
Another weight receiving plate 33 is fixed to the weight receiving plate 33, and this weight receiving plate 33 has the same size as the weight receiving plate 29, but does not have a protrusion. The load lever 26 has two weight receiving plates 29 and 33.
is equal to the load corresponding to the lowest hardness among the specific hardnesses to be checked.

For example, in this example it is equal to a load of 255f1, which corresponds to a hardness of 25. The weight 34 can be fitted to the two weight receiving plates 29 and 33, and has a weight of 2009.

By fitting this weight 34 to the weight receiving plate 29 at position A, a load equivalent to the hardness of about 50 will be applied to the pusher needle 27, and by fitting this weight 34 to the weight receiving plate 33 at position B. If you wear it,
A load corresponding to a hardness of 75 mm will be applied. In this way, a plurality of hardness points can be checked by an extremely simple operation of moving and placing one weight at each position A and B. The pedestal 23 has a T-shaped cross section like the conventional pedestal, instead of the step-like and slidable structure of the above embodiment, and can be raised and lowered through a mete hole (not shown) provided in the machine pedestal 20. - It can be constructed to be attached with a fixed rest.

A pedestal with this structure has the advantage that the height can be adjusted for a hardness tester of any size (although it is slightly inferior in terms of the effort required to adjust the height itself compared to a pedestal with a stem structure). When using the tester of the present invention, first, depending on the dimensions of the hardness meter 28 to be tested, select the appropriate step among the steps of the pedestal 23, for example, in the case of the lower step of the slide section 22, move the slide section 22 along the arrow L. After sliding the lower step in the direction A and fixing it with the fixing screw 24, place the hardness meter 28 on the pedestal 23 at the A position with the indenter 27 facing upward.

Next, load lever 2 with no weight 34 fitted
6 downward to push the protrusion 30 of the weight receiving plate 29 into the presser needle 27v.
c. bring it into contact. In this state, a load 255f1 corresponding to a hardness of 25, which is the first check point, is applied, so it is checked whether the scale of the pointer of the hardness meter is correctly pointing to 25. If it is not suitable, adjust the spring of the hardness tester or the spring clamp according to the usual method. Next, the weight (2009) 34 is fitted onto the weight receiving plate 29 at the A position. In this state, a load corresponding to a hardness of 50, which is the second check point, is being applied, so check whether the scale of the pointer of the hardness meter is correctly pointing to 50. If it is inappropriate, adjust the hardness meter as before.6Finally, remove the same weight 34 from position A and fit it on the weight receiving plate 33 at position B. In this state, the third
Since a load corresponding to a hardness of 75 is applied, which is the check point, check whether the scale of the pointer on the hardness meter is 75, and if it is inappropriate, adjust the hardness meter. As described above, the hardness meter tester of the present invention allows the height of the pedestal to be adjusted, and uses a load lever pivoted to be movable up and down to move one weight to multiple predetermined positions on the lever. Because they fit together, the labor of adding and removing weights is greatly simplified and work efficiency is improved.There are no measurement errors due to frictional resistance, and measurement accuracy is improved.Furthermore, the hardness tester It has excellent effects such as easy setting work on the stand and shortening work time.

[Brief Description of the Drawings] Fig. 1a is a front view of a conventional hardness tester, Fig. 1b is a front view of a spring-type hardness tester, Fig. 2 is a front view of an embodiment of the present invention, and Fig. 3 is a front view of a conventional hardness tester. The figure is a reduced view of the plan view of FIG. 2. 23... pedestal, 26... load lever,
27... Push needle, 28... Hardness meter, 29
...Weight receiving plate, 33... Weight receiving plate, 3
4... Weight.

Claims (1)

[Claims] 1. A hardness meter is placed on a pedestal with the indentation needle facing upward, and a load corresponding to a specific hardness is applied to the indentation needle in several stages, respectively, to change the scale of the hardness meter. In the hardness meter tester, the height of the pedestal is adjustable, and on the other hand, the pedestal is pivoted so as to be swingable up and down relative to the indentation needle of the hardness tester on the pedestal, and A load lever is provided which sometimes comes into contact with the pusher needle, the weight of the load lever is equal to the load corresponding to the lowest hardness among the specific hardnesses, and one weight is placed at a plurality of desired positions of the load lever. A hardness meter tester characterized by being able to apply a load corresponding to a specific hardness in several stages by moving and placing the tester. 2. The hardness meter tester according to claim 1, wherein the height of the pedestal is adjustable by making the pedestal step-like and slidable.