JP3102387U - Masking material - Google Patents

Abstract

An object of the present invention is to provide a masking member which is extremely simple and easy to manufacture, is inexpensive in cost, can cope with a variation in the diameter of a hole of an object to be coated without any problem, and can be used with versatility.
Kind Code: A1 A member for masking an inner surface of a hole, which is a non-coating portion of an object to be coated, is provided. The overlapped portion 13 was formed so that the cut end portion 12 had a predetermined diameter, and was reduced in diameter to be pressed against the inner surface of the hole.
[Selection diagram] Fig. 1

Description

  The present invention relates to a masking member that protects an inner surface of a hole, which is an unnecessary part of a workpiece, from paint.

  For example, when painting automotive parts, if paint adheres to the inner surface of a hole into which another member is inserted or the inner surface of a ball bearing, there is a risk that improper assembly of the member or malfunction of the bearing portion may occur. For this reason, a masking tape is stuck to the unpainted portion, or a dedicated masking jig is used to prevent paint from adhering to the unpainted portion.

  For example, a masking jig 40 shown in FIG. 4 is disclosed in Japanese Patent Application Laid-Open No. Hei 5-7804, in which a cylindrical portion 41 is fitted in a hole portion 51 which is a non-painted portion of a workpiece 50 in a substantially close contact state. It is possible. The masking jig 40 has a main body made of a metal such as iron or copper, and the outer diameter of the cylindrical portion 41 is formed to be substantially the same as the diameter of the inner surface of the hole 51 of the unpainted portion. However, such a dedicated masking jig 40 must produce a high-precision member in each case according to the non-painted portion, which is not only complicated but also expensive. In addition, when high dimensional accuracy is required and there is an error in the cylindrical portion 41 of the jig or a variation in the diameter of the hole portion 51 in the unpainted portion, sufficient masking cannot be performed, resulting in poor painting or the like. It can be the cause of the problem.

  The present invention has been made in view of the above points, and is extremely simple and easy to manufacture, inexpensive, and can cope with variations in the hole diameter of the workpiece without any problem. It is intended to provide a masking member that can be used.

  That is, the invention of claim 1 is a member for masking an inner surface of a hole which is an unpainted portion of an object to be coated, and a paper tube having a predetermined length formed of a cardboard having a thickness of 0.2 to 1 mm. The present invention relates to a masking member characterized in that a cut-out portion is formed in the direction, and a cut-out end portion is formed with an overlapped portion so as to have a predetermined diameter and is reduced in diameter so as to be pressed against the inner surface of the hole portion.

  The invention according to claim 2 relates to the masking member according to claim 1, wherein the overlapped portion of the cut end portion is 10 to 45% of the entire circumference.

  The invention according to claim 3 relates to the masking member according to claim 1 or 2, wherein the paper cylinder is a spiral paper cylinder manufactured by winding a base paper around a spiral.

Further, in the invention of claim 4, a flange member having a hole of a predetermined diameter is formed on the outer peripheral side of the cylindrical main body via an adhesive portion on the opposite side in the circumferential direction of the overlapping portion. The masking member according to any one of the above.

  According to the masking member of the present invention, a paper cylinder of a predetermined length formed of a cardboard having a thickness of 0.2 to 1 mm is cut open in the tube direction, and an overlapped portion is formed so that the cut end has a predetermined diameter. Since the diameter is reduced so as to be pressed against the inner surface of the hole, the manufacture is extremely easy and easy, the cost is low, and it is possible to cope with a variation in the hole diameter of the object to be coated without any problem. A masking member that can be used with versatility can be provided.

  According to the invention of claim 2, since the overlapped portion of the cut end portion is 10 to 45% of the entire circumference, the diameter of the overlapped portion can be easily changed, and the hole of the object to be coated can be easily changed. Variations in diameter can be easily dealt with, and the inner surface of the hole can be securely pressed and held.

  Further, according to the invention of claim 3, since the paper cylinder is a spiral paper cylinder manufactured by winding a base paper around a spiral, the production of the paper cylinder is easy, the rigidity is excellent, and the diameter is reduced. The rebound (recovery) in the circumferential direction is large, and the pressure is reliably applied to the inner surface of the hole in the unpainted portion.

  Still further, according to the invention of claim 4, a flange member having a hole of a predetermined diameter is formed on the outer peripheral side of the cylindrical main body via an adhesive portion on the opposite side in the circumferential direction of the overlapping portion. Therefore, the non-painted portion can reliably mask not only the inner surface of the hole but also the peripheral edge thereof.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a perspective view showing an embodiment of the masking member of the present invention, the masking member and the object to be coated, FIG. 2 is a perspective view showing another embodiment of the masking member and the object to be coated, and FIG. It is.

  As shown in FIG. 1, the masking member 10 of the present invention is a member for masking the inner surface 22 of the hole, which is the non-coating portion 21 of the object 20, and is formed of cardboard having a thickness of 0.2 to 1 mm. A paper cylinder 11 having a predetermined length is cut open in the tube direction, and the cut end portions 12 and 12 are formed with a overlapped portion 13 so as to have a predetermined diameter and reduced in diameter, and are pressed against the inner surface 22 of the hole. Things.

  As the masking member 10, a paper cylinder 11 having high resilience (restoring property) made of cardboard base paper, cardboard impregnated with a reinforcing agent, or the like is preferably used. The cardboard 11 has a thickness of 0.2 to 1 mm (more preferably 0.2 to 0.5 mm), and has a length that can sufficiently cover the non-painted portion 21 to be attached. . The paper tube 11 is cut open in the tube direction, the cut ends 12 and 12 are overlapped to reduce the diameter as a overlapped portion 13, inserted into the hole inner surface 22 which is the non-painted portion 21, and pressed by the repulsive force. In addition, as a material of the masking member, if the same shape is used, such as a lightweight metal such as iron or tin, and a plastic having elasticity, it can be used as a masking material by being pressed against the inner surface 22 of the hole of the unpainted portion 21. However, in the case of a metal material, a considerable force is required to reduce the diameter, which imposes a burden on the operator, and in long-term use, a warp or swarf specific to the metal is generated, which is likely to be deformed and difficult to use. In addition, plastics may be deformed by high temperatures (170 to 180 ° C.) during baking.

  It is preferable that the overlapping portion 13 of the cut end portions 12 and 12 is 10 to 45% of the entire circumference as defined in claim 2. The ratio of the overlapped portion 13 is a numerical value that can easily reduce the diameter of the masking member 10 and maintain its shape, and has an appropriate repulsive force (restoring force) to increase the diameter when the reduction in diameter is released. That is, using the masking member 10 having a diameter larger than the inner diameter of the unpainted portion 21, the reduced diameter is inserted into the hole inner surface 22 of the unpainted portion 21, and the pressure is brought into contact by releasing the reduced diameter. Therefore, it is preferable to use the masking member 10 having a size corresponding to the inner diameter of the unpainted portion 21 so that the polymerization ratio of the polymerization portion 13 is obtained. For example, a masking member 10 having an outer diameter of about 15 mm can be suitably used for the non-painted portion 21 having an inner diameter of 9 mm.

  Further, the paper cylinder 11 of the masking member 10 is preferably a spiral paper cylinder manufactured by winding a base paper around a spiral as defined in claim 3. The paper cylinder 11 wound around this kind of spiral is easy to manufacture the paper cylinder, has excellent rigidity, has a large circumferential rebound (restoreability) when the diameter is reduced, and has a hole in an unpainted portion. It has the desirable property that it is securely pressed against the inner surface.

  The article to be coated 20 to which the masking member 10 is attached is, for example, an automobile part as shown in FIG. 1. Things. In this example, since the unpainted portion 21 is a hole used for connection with a shaft member or another component, masking is performed so that the paint does not adhere to the inner surface 22 of the hole.

  The masking member 10 is inserted into the hole inner surface 22 in a state where the outer diameter of the masking member 21 is reduced so as to be smaller than the diameter of the hole inner surface 22. If the reduced diameter is released when the insertion position of the masking member 10 is adjusted, the repulsive force (restoring force) of the paper cylinder 11 in the radially increasing direction presses against the inner surface 22 of the hole to cover the unpainted portion 21. be able to.

  Further, as shown in FIG. 2, when the non-painted portion 31 is the hole inner surface 32 and its peripheral edge 33, for example, a ball bearing is provided on the work 30 to be coated, and the non-painted portion 31 is formed in the hole inner surface of the ball bearing. For example, in the case of 32 and its peripheral portion 33, a masking member 10A having a flange member 15A can be used. As shown in FIG. 4, the masking member 10A has a flange member 15A having a hole 16A of a predetermined diameter on the outer peripheral side of the cylindrical main body 11A, as shown in FIG. This is formed via the bonding portion 17A on the opposite side.

  The flange member 15A of the masking member 10A is a member that covers and masks the hole peripheral portion 33 of the non-painted portion 31, and can be obtained by cutting a paperboard or cardboard into a predetermined size with a Thomson blade or the like. . An adhesive portion 17A is provided on the opposite side in the circumferential direction of the cut-out portion 12A so as not to hinder the diameter reduction of the cylindrical main body 11A.

  The masking member 10A with the flange member 15A is configured such that the outer diameter of the cylindrical main body 11A is smaller than the diameter of the hole inner surface 32 with respect to the hole inner surface 32 which is the non-coating portion 31 of the workpiece 30. Is inserted into the hole inner surface 32 with the diameter reduced. When the diameter reduction of the masking member 10A is released at a position where the flange portion 15A of the masking member 10A abuts on the hole peripheral portion 33, the repulsive force (restoring force) in the diameter increasing direction causes the inner surface 32 of the hole. And the flange member 15A closely adheres to the peripheral portion 33 of the non-painted portion 31 to cover the entire non-painted portion 31.

  According to the masking members 10 and 10A thus configured, the non-painted portions 21 and 31 of the objects 20 and 30 can be masked easily and easily, and the inner surfaces 22 of the holes of the non-painted portions 21 and 31 can be easily formed. , 32 can be mounted without any problem. Also, by changing the overlapping ratio of the overlapped portion, it has versatility that can be used for a wide range of non-painted portions 21 and 31. It is not necessary to manufacture a new masking member each time according to the unpainted portions 21 and 31. Moreover, since it is made of paper, it can be manufactured at low cost, and even if the state of the masking members 10 and 10A deteriorates, it can be replaced promptly and the workability is improved.

FIG. 3 is a perspective view showing an embodiment of the masking member, the masking member, and the member to be coated according to the present invention. It is a perspective view showing other examples of a masking member and a member to be coated. FIG. 3 is a front view of the masking member of FIG. 2. It is sectional drawing which shows the Example of the conventional masking member and the to-be-coated member.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 10 Masking member 11 Paper cylinder 12 Cut-out end 13 Overlapping part 10A Masking member (with flange member)
11A Cylindrical main body 12A Cut open end 13A Overlapping portion 15A Flange member 17A Adhesive portion 20,30 Workpiece 21,31 Non-painting portion 22,32 Hole inner surface 33 Peripheral edge

Claims (4)

A member for masking an inner surface of a hole, which is a non-coating portion of an object to be coated, wherein a predetermined length of a paper cylinder formed of a cardboard having a thickness of 0.2 to 1 mm is cut open in the tube direction, and the cut end is cut. A masking member characterized in that an overlapped portion is formed so as to have a predetermined diameter and the diameter is reduced so as to be pressed against the inner surface of the hole. 2. The masking member according to claim 1, wherein the overlapped portion of the cut end is 10 to 45% of the entire circumference. The masking member according to claim 1, wherein the paper cylinder is a spiral paper cylinder manufactured by winding a base paper around a spiral. The masking according to any one of claims 1 to 3, wherein a flange member having a hole having a predetermined diameter is formed on an outer peripheral side of the cylindrical main body via an adhesive portion on a circumferentially opposite side of the overlapping portion. Element.

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