JPH0217016Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a masking jig that is inserted into a hole that does not require surface treatment during surface treatment such as plating.

[Conventional technology and its problems]

When performing surface treatments such as plating and alumite processing, if there are screw holes, reamed holes, H tolerance holes, etc. (hereinafter simply referred to as holes) that do not require treatment, the holes should be cleaned in advance before the surface treatment. Masking work is required to block it.

Conventional methods for masking these holes have been to insert resin screws or pieces of wood, fill them with clay, or apply resin, but these methods are cumbersome and time-consuming, and Broken or
There were problems such as it took time and effort to remove it from the holes after surface treatment.

Therefore, rubber plugs that are easily elastically deformed have been inserted into the holes, but conventional rubber plugs for masking of this type have a thin straight bar shape or a trapezoid shape, making them difficult to use. In other words, there are a wide variety of holes to be masked, ranging from minute diameters to relatively large diameters, but the above methods cannot flexibly respond to changes in hole diameter, so they have to be prepared in a large number of sizes. Must. Also,
During actual work, it took time to select a plug with dimensions that matched well with the hole diameter, resulting in problems such as reduced efficiency.

Furthermore, the former rubber plug has poor rigidity and is easily deformed by contacting the hole wall when inserted into the hole, making masking work for narrow and deep holes extremely troublesome.
The latter rubber plug is very difficult to insert into the hole if the hole diameter corresponds to the large diameter side.

[Means for solving problems]

This invention solves the conventional problems as mentioned above,
It is an object of the present invention to provide this type of masking work jig which has a simple structure and can easily mask holes ranging from a relatively large hole diameter to a minute hole diameter with one size.

In order to achieve the above object, the present invention is a jig for inserting into a hole that does not require surface treatment during surface treatment such as plating, and is made of rubber and has a substantially flat rear end surface 4 and a It has a conical shape with a smooth slope connecting it to the tip 5 on the opposite side, the length from the rear end surface 4 to the tip 5 is at least three times that of the rear end surface 4, and the hole 7 extends from the rear end surface 4 in the axial direction. The configuration is as follows.

〔Example〕

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1 to 4 show a jig for masking work according to the present invention, in which 1 is a surface-treated object, 2a is
2 is a through screw hole provided in the surface treated product 1, 2b is a blind screw hole, and 2c is a small diameter unthreaded hole.

Reference numeral 3 designates a jig of the present invention, which has a conical shape with a substantially flat rear end surface 4, a pointed end 5 on the opposite side, and a smooth slope 6 connecting the rear end surface 4 and the pointed end 5.

The length L from the rear end surface 4 to the tip 5 is the rear end surface 4.
The relationship is approximately L≧3D with respect to the diameter D of . This is because if the slope 6 is made gentler, it can match hole diameters of various sizes, and can also cope better with deep holes, so the upper limit is generally L≧6 to 10.

Reference numeral 7 denotes a hole formed to a required depth in the axial direction from the rear end surface 4, and is preferably tapered as shown.

Although not shown in the drawings, it is of course possible to provide grooves or protrusions on the slope 6 at fixed lengths to serve as scales and cutting guides, or to change the color at fixed lengths.

According to the present invention, when masking each hole of the surface-treated product 1, as shown in FIG. Simply push it in until it comes into close contact with the hole, and the tip 5 will automatically match the hole diameter and protrude to the opposite side of the surface-treated object. As for the blind screw hole 2b, simply cut off the tip 5 to an appropriate length with a cutter, scissors, etc., and similarly push it in until the slope 6 comes into close contact with the hole end 8, and it will automatically match the hole diameter and be closed. Furthermore, since the thin threadless hole 2c has a pointed end 5, it can be pushed in, and by cutting off the unnecessary part with a cutter or the like, the remaining part can be used to close the previous blind hole.
This results in a masking state as shown in FIG.

In terms of work, since the tip is not flat but has a pointed tip 5, it serves as a good insertion guide for the holes 2a and 2c, and is also suitable for use with the one on the right in Figure 1 and the one on the right in Figure 1.
Even minute and deep holes like the one shown in the figure can be easily and reliably masked. Furthermore, the L-shaped holes formed on the top and side surfaces can also be easily masked.

Moreover, since the hole 7 is formed in the axial direction from the rear end surface 4, the retractability is improved, and when masking the screw hole 2a with a relatively large diameter as shown in FIG. Since it penetrates deeply and then recovers, the contact pressure with the hole edge can be increased, resulting in a higher masking effect. In addition, the hole 7 also functions as an operation hole, and since a rod-shaped object can be inserted into the hole, the elasticity of the rubber prevents it from popping out and allows it to be firmly and deeply inserted into the hole. . Also, if the hole 7 is tapered as shown in the figure, the tip 5 of the other jig can be attached here.
Since the jigs can be inserted and connected one after another, the jigs will not be scattered when masking multiple holes or during storage, making handling easier.

[Effect of idea]

According to the present invention described above, in a jig for insertion into a hole that does not require surface treatment during surface treatment such as plating, the jig is made of rubber and has a substantially flat rear end surface 4 and an opposite side. The female threaded hole 2 is configured in a conical shape with a smooth slope connecting it to the tip 5, and the length from the rear end surface 4 to the tip 5 is at least three times that of the rear end surface 4.
If it is inserted into a, 2b or unthreaded hole 2c and cut with a cutter as appropriate depending on the hole diameter and hole bottom shape, it will stick tightly to the hole opening or thread groove, thus preventing the intrusion of plating liquid, etc. In particular, since the tip 5 is not flat but sharp, it can exert a good guiding effect to the hole, and can steplessly drill deep holes with small diameters from large holes to minute holes with one jig. But it can be easily and reliably masked.

In addition, since the hole 7 is formed in the axial direction from the rear end surface 4, it has good retractability, and in order to penetrate deeper and restore the shape than if it were completely faithful, a high contact pressure can be applied to the hole to be masked. In addition, since it can function as an operation hole when inserted into the hole to be masked, it can be inserted sufficiently against the extrusion effect due to the elasticity of the rubber.
Furthermore, excellent effects such as a simple structure and low cost can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view showing an example of the use of the present invention, Fig. 2 is a side view showing the state of a single unit, Fig. 3 is a plan view thereof, Fig. 4 is a sectional view thereof, Fig. 5 a,
b is a perspective view showing masking of various holes step by step; 1...Surface treated product, 2a, 2b, 2c...pores,
4... Rear end surface, 5... Tip, 6... Slope, 7...
Hole.

Claims (1)

[Scope of utility model registration request] It is a jig for inserting into a hole that does not require surface treatment during surface treatment such as plating, and is made of rubber and has a smooth jig that connects a nearly flat rear end surface 4 and a pointed end 5 on the opposite side. A masking characterized in that it has a conical shape with sloped surfaces, the length from the rear end surface 4 to the tip 5 is at least three times that of the rear end surface 4, and a hole 7 is provided in the axial direction from the rear end surface 4. Work jig.