JPS6212279Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a pencil drag tester.

A pencil scratch tester is usually used to test the hardness of a paint film, and the scratch resistance of the paint film is measured by the tearing of the paint film when the hardness exceeds the hardness of a pencil lead. It is something. As this type of pencil drag tester, for example, the one shown in FIG. 1 has been proposed.

That is, in the same figure, 1 is a pencil, 2 is a pencil holder, 3 is a test piece mounting stand, 4 is a test piece, 5 is a test piece fastener, 6 is a weight, 7 is a weight stand, 8 is a balance weight, and 9 is a A set screw, 10 a rod, 11 a handle for moving the test piece mount 3, and 12 a base. The pencil 1 is set on a vertical line passing through the center of gravity of the weight 6 at an angle of approximately 45° with respect to the test piece 4.

During the test, while turning the handle 11 and moving the test piece mount 3 to which the test piece 4 is attached, the pencil 1 is applied to the test piece 4 while changing its resistance by changing the hardness of the pencil lead. We test the paint film based on the hardness of the pencil lead while observing the degree of tearing of the paint film.

By the way, in the case of the conventional pencil drag tester with the configuration shown in Figure 1, it is a stationary type that fixes the pencil and moves the test piece, so it can only perform tests separated from the product, etc. There are disadvantages in that it is not possible to directly test a three-dimensional object such as a product because it is only a piece, and the shape is also disadvantageous.
In addition, in the case of a pencil drag tester, the tip of the pencil must be set on the pencil line passing through the center of gravity of the weight, but in the case of a conventional tester as shown in Figure 1, it is necessary to set this by visual measurement. Because of this, it is difficult to set it up, and it also lacks certainty. Furthermore, since it is a stationary type, it is difficult to carry and has disadvantages such as being expensive.

In view of these points, this device has a simple structure, is easy to carry, allows direct testing not only on test pieces, but also on three-dimensional objects such as products, and also allows the tip of the pencil to be set in a predetermined position and securely. To provide a small and inexpensive pencil drag tester.

An embodiment of this invention will be described in detail below with reference to FIGS. 2 to 9.

Figure 2 shows the overall structure of this embodiment.
In the same figure, 21 is a base, for example, the fourth
The shape is as shown in the figure. That is, in the figure, FIG. 4A is a plan view thereof, and FIG. 4B is a side view thereof, and the base 21 has a substantially U-shaped base portion 21a and the other side of this base portion 21a. It consists of a protrusion 21b that protrudes from. 22 is a support stand,
The support stand 22 has an inverted L-shaped side surface, for example, as shown in FIG. 5, and the lower part 22a of the support stand 22 is attached to the protrusion 21b of the base 21 with screws or the like. For example, as shown in FIG. 6, 23 is a sliding tube consisting of a cylindrical portion 23a and a wing portion 23b, and the cylindrical portion 23a is inserted into an opening 22b (see FIG. 5A) provided on the upper surface of the support base 22. The wing portion 23b is fixed to the upper surface of the support base 22 with screws or the like, so that the wing portion 23b is suspended on the support base 22. A notch 23c of a predetermined shape is provided on the side surface of the slide tube 23 for reasons to be described later. Reference numeral 24 designates a slide shaft that is loosely fitted into the slide tube 23 and serves as a guide member that is movable up and down within the slide tube 23, and 25 is a weight that is detachably attached to the slide shaft 24. As shown in FIG. 7, the slide shaft 24 has a threaded portion 24a at its upper portion, and a weight 25 is removably attached to the slide shaft 24 via this threaded portion 24a.

26 is a pencil; 27 is a cylindrical pencil holder for holding the pencil 26 at a predetermined angle, for example, 45 degrees, with respect to the test member; It is said that 28
is a knob for holding the pencil 26, and is screwed into a screw hole 27a (see FIG. 8) of the holder 27. Further, 29 is a knob for stopping the holder 27. The holder 27 is connected to the holder support member 3
rotatably supported by 0. The holder support member 30 includes a through hole 30a into which the pencil holder 27 is rotatably fitted, as shown in FIG. 9, for example;
Screw holes 30c and 30d are formed in the inclined portion 30b with a predetermined inclination angle of 45°, for example, and a through hole 3 is provided on the free end side.
Screw hole 30e drilled to penetrate up to 0a
has. Then, the inclined portion 30b is
A screw hole 24 provided in the slide shaft 24 contacts the side surface of the slide shaft 24 through the notch 23a of No. 3.
b, 24c (see FIG. 7) Connect the holder support member 30 and slide shaft 2 with screws or the like using the screw holes 30c, 30d provided in the holder support member 30 described above.
Try to combine 4. Thereby, the holder support member 30 also becomes movable up and down in conjunction with the slide shaft 24. Note that the knob 29 is screwed into the screw hole 30e of the holder support member 30. Reference numeral 31 is a retaining ring for preventing the pencil holder 27 from falling off from the holder support member 30, and is locked in a groove 27b (see FIG. 8) provided on the lower outer periphery of the holder 27.

Reference numeral 32 designates a shaft whose tip end has a substantially elliptical cross-sectional shape as shown in FIG. 3, 33 a bearing for receiving this shaft 32, and 34 a knob attached to one end of the shaft 32. By turning this knob 34, the shaft 32 can be rotated left and right as shown by the arrow in FIG. , and the slide shaft 24 connected thereto is pulled upward. On the other hand, the shaft 32
When the protrusion 32a is rotated and the protrusion 32a is no longer in contact with the weight 25, the slide shaft 24 is moved downward by its own weight or by the vertical load of the weight 25 as shown by the arrow a. Further, 35 is a test member.

During the test, the protrusion 32a of the shaft 32 is brought into contact with the weight 25 by operating the knob 34, and the weight 25 and the slide shaft 24 connected thereto are lifted upward, and the lower part thereof is placed on the lower surface of the slide tube 23. Place the testing machine on the test member 35 while the pencil holder 27 is in a predetermined position, place the tip of the pencil 26 held in the holder 27 against the test member 35, and use the knob 28 to tighten the pencil 26. When stopped, the tip of the pencil 26 will be set on a vertical line passing through the center of gravity of the weight 25. Then, by operating the knob 34 again, the protrusion 32a of the shaft 32 and the weight 2 are
5 is released from contact with the pencil 26, and a vertical load is applied by the weight 25 to the tip of the lead of the pencil 26, which is located on a vertical line passing through the center of gravity of the weight 25. A drag test can be performed by moving the test member 35 on the test member 35 in the direction shown by arrow b.

Further, the tip of the lead of the pencil 26 needs to have a new sharp corner each time it is tested. Therefore, when performing the next test, the pencil holder 27 may be rotated to utilize a different new corner of the lead of the pencil 26. This allows you to always carry out the drag test with a pencil whose lead has a sharp edge, and is therefore extremely convenient when you are stuck multiple times.

As described above, according to this invention, there is a cylindrical member suspended from a support on a base, a guide member that is movable up and down within this cylindrical member, and a guide member that is connected to the guide member to hold a pencil as a test member. A support member supported at a predetermined angle with respect to the test member, and a pencil holding member rotatably attached to one side of this support member to hold a pencil, so that the lead of the pencil is brought into contact with the test member. You can easily set the position of the pencil by simply In addition, since the shape is small and lightweight, and the entire testing machine can be moved, the test member is not limited to test pieces, and can directly test three-dimensional items such as products. Also, the cost is extremely low. Furthermore, since the pencil holder is rotatable, a new lead corner of the pencil can be quickly set as required.

Note that the load of the slide shaft 24 may be used instead of the weight 25 as a means for applying the load.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a conventional device, Fig. 2 is a block diagram showing an embodiment of this invention, Fig. 3 is a sectional view taken along the line A-A of the shaft 32, and Fig. 4 is a block diagram showing an example of a conventional device. A
and B are a plan view and a side view of the base 21, respectively, and the fifth
Figures A and B are a top view and a side view of the support base 22, Figures 6A and B are a front view and a sectional view of the slide tube 23, and Figure 7 is a front view showing the slide shaft 24 partially cut away. FIG. 8 is a partially cutaway front view of the pencil holder 27, and FIGS. 9A, B, and C are a top view, longitudinal sectional view, and front view of the holder support member 30, respectively. 21 is a base, 22 is a support base, 23 is a slide tube, 24 is a slide shaft, 25 is a weight, 26 is a pencil, 27 is a pencil holder, 28 is a knob for holding a pencil,
29 is a holder retaining knob, 30 is a holder support member, 31 is a retaining ring, 32 is a shaft, 33 is a bearing, 3
4 is a knob, and 35 is a test member.

Claims (1)

[Scope of utility model registration request] A cylindrical member suspended from a support on a base, a guide member movable up and down within the cylindrical member, and a holder connected to the guide member to support a pencil at a predetermined angle with respect to the test member. A pencil drag tester comprising: a support member; and a pencil holder rotatably attached to the holder support member and holding the pencil.