JP2005074347A - Roller for coating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low production cost roller for coating of which the difference of the elongation of an inside cylinder and an outside cylinder is absorbed. <P>SOLUTION: The roller comprises an outside cylinder 13 provided with a brush part 14 in the outer circumferential face and formed by spirally rolling a resin and an inside cylinder 12 inserted into the outside cylinder 13 and having an axial length L1 shorter than the axial length L2 of the outside cylinder 13 and one end 13b of the outside cylinder 13 is bent toward the inside of the inside cylinder 12 and the folded part 20 is welded to the inner face of one end 12b of the inside cylinder 12 and the other end 12a of the inside cylinder 12 is welded to the other end 13a of the outside cylinder 13, which is the insertion inlet side of a handle shaft 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a coating roller in which an outer cylinder having a brush portion on an outer peripheral surface is fixed to the outside of an inner cylinder that rotatably supports a handle shaft.

As a coating roller in which an outer cylinder having a brush portion on its outer peripheral surface is fixed to the outside of an inner cylinder that rotatably supports a handle shaft, those shown in FIGS. 5 and 6 are conventionally known (Patent Document 1). ).
In this conventional coating roller, a roller body R is rotatably attached to the shaft 1 of the handle H. The roller body R has an inner cylinder 2 that rotatably supports the shaft 1 of the handle H and an outer cylinder 3 fixed to the outer periphery thereof as main elements.
The inner cylinder 2 is made of synthetic resin and manufactured by molding, and a support wall 5 is provided inside thereof. A through hole 5a is formed in the support wall 5, and the shaft 1 of the handle H is inserted into the through hole 5a.

  The inner cylinder 2 incorporates a fixed cylinder 6 made of synthetic resin. The fixed cylinder 6 has an inner diameter before inserting the shaft 1 smaller than the outer diameter of the shaft 1. However, since the fixed cylinder 6 has radial elasticity, the shaft 1 of the handle H can be passed through the fixed cylinder 6 as shown in the figure. When the shaft 1 is passed through the fixed cylinder 6 in this way, the inner diameter of the fixed cylinder 6 increases, but the elasticity tends to return to the original diameter. The fixed cylinder 6 tightens the shaft 1 by the force to return to the original diameter, and the fixed cylinder 6 is fixed to the shaft 1.

A guide tube 7 that rotatably supports the shaft 1 is attached to one end 2a of the inner tube 2. The guide cylinder 7 is configured to be press-fitted into one end of the inner cylinder after the fixed cylinder 6 is assembled into the inner cylinder 2. Then, by fixing the guide tube 7 to one end of the inner tube 2 in this way, the fixed tube 6 is prevented from coming out of the inner tube 2.
Further, by preventing the fixed cylinder 6 from coming off from the inner cylinder 2 in this way, the shaft 1 of the handle H to which the fixed cylinder 6 is fixed is also prevented from being detached from the inner cylinder 2.

The outer cylinder 3 is fixed to the outer periphery of the inner cylinder 2 as described above. The outer cylinder 3 is formed by spirally winding a synthetic resin strip around the mandrel, and in this state the strip is It is formed in a cylindrical shape by adhering to each other.
A brush portion 4 made of chemical fiber, sponge, or the like is fixed to the outer periphery of the outer cylinder 3 as described above. Then, by including a paint in the brush portion 4, the paint or the like can be applied to a wall or a floor.

Further, the inner surface of the outer cylinder 3 is thermally welded to the entire surface of the inner cylinder 2, and the reason why both are thermally welded over the entire mating surface will be described below.
Since both the inner cylinder 2 and the outer cylinder 3 are made of synthetic resin, the inner cylinder 2 and the outer cylinder 3 expand due to the influence of thinner contained in the paint. However, due to the difference in manufacturing method, the inner cylinder 2 extends in the axial direction. There is a difference between the amount and the amount of elongation of the outer cylinder 3 in the axial direction. That is, since the inner cylinder 2 is manufactured by molding, the inner cylinder 2 expands in the radial direction and the axial direction due to the influence of the thinner. However, the outer cylinder 3 is formed by spirally winding a strip made of synthetic resin. Since it is formed in a shape, it expands in the spiral direction due to the influence of thinner. As a result, the amount of elongation in the axial direction of the inner cylinder 2 is larger than that of the outer cylinder 3.

If the adhesive force between the inner cylinder 2 and the outer cylinder 3 is insufficient, the inner cylinder 2 may protrude from both ends of the outer cylinder 3 due to the difference in the amount of extension in the axial direction. In addition, the inner cylinder 2 may be detached from the outer cylinder 3.
Therefore, in the above conventional example, the above inconvenience is prevented by heat-welding the entire mating surface of the inner cylinder 2 and the outer cylinder 3.

Japanese Unexamined Patent Publication No. 2000-023743 (FIG. 2)

In the conventional coating roller, since the entire joining surface of the inner cylinder 2 and the outer cylinder 3 had to be thermally welded, the problem is that the welding work takes time and the manufacturing cost increases due to the large welding area. was there.
An object of the present invention is to provide a coating roller that can absorb the difference in elongation between the inner cylinder and the outer cylinder and that is inexpensive to manufacture.

  The first invention includes a brush portion on the outer peripheral surface, an outer cylinder formed by winding a resin in a spiral shape, and an inner side made of resin having an axial length shorter than that of the outer cylinder while being inserted into the outer cylinder. A tube, and bend one end of the outer tube to the inside of the inner tube, weld the bent portion to the inner surface of one end of the inner tube, and connect the other end of the outer tube to the other end of the outer tube on the handle shaft insertion port side. It is characterized by welding the ends.

  The second invention is characterized in that, in the first invention, an intrusion prevention wall is provided in the inner cylinder in the vicinity of the welded portion where one end of the outer cylinder is welded.

According to the first invention, a portion where one end of the outer cylinder is bent to the inner side of the inner cylinder is welded to the inner surface of one end of the inner cylinder, and the other end of the outer cylinder on the insertion port side of the handle shaft is connected to the inner cylinder. Since the other end is welded, the welding area can be reduced as compared to the case where the entire mating surface of the inner cylinder and the outer cylinder is welded. If the welding area is reduced, the work cost for the welding work is reduced, so that the manufacturing cost can be reduced.
Also, since one end of the outer cylinder is bent inside the inner cylinder, and the bent part is welded to the inner surface of the inner cylinder, even if there is a difference in the amount of elongation between the inner cylinder and the outer cylinder, One end of the inner cylinder does not protrude from the outer cylinder.

  According to the second aspect of the invention, since the intrusion prevention wall is provided in the inner cylinder in the vicinity of the welded portion where one end of the outer cylinder is welded, even if the paint enters the outer cylinder, it is prevented by the intrusion prevention wall. It is possible to prevent the infiltration of the above paint.

In the first embodiment shown in FIGS. 1 and 2, the roller body R is rotatably attached to the shaft 11 of the handle H.
The roller main body R includes an inner cylinder 12 that rotatably supports the shaft 11 of the handle H and an outer cylinder 13 fixed to the outer periphery thereof as main elements.
The inner cylinder 12 is made of synthetic resin and is manufactured by molding, and has a support wall 15 inside. A through hole 15a is formed in the support wall 15, and the shaft 11 of the handle H is inserted into the through hole 15a.

  In addition, a synthetic resin fixed cylinder 16 is incorporated in the inner cylinder 12. The fixed cylinder 16 has an inner diameter before inserting the shaft 11 smaller than the outer diameter of the shaft 11. However, since the fixed cylinder 16 has radial elasticity, the shaft 11 of the handle H can be passed through the fixed cylinder 16 as illustrated. When the shaft 11 passes through the fixed cylinder 16 in this manner, the inner diameter of the fixed cylinder 16 increases, but the elasticity tends to return to the original diameter. Then, the fixed cylinder 16 tightens the shaft 11 by the force of returning to the original diameter, and the fixed cylinder 16 is fixed to the shaft 11.

A guide cylinder 17 that rotatably supports the shaft 11 is attached to the end 12 a of the inner cylinder 12. After the fixed cylinder 16 is assembled into the inner cylinder 12, one end of the guide cylinder 17 is inserted into the inner cylinder 12, and the flange portion 17 a provided at the other end is connected to the end 12 a of the inner cylinder 12 and the outer cylinder 13. It welds to the edge part 13a using an ultrasonic wave.
In this way, by fixing the flange portion 17a of the guide tube 17 to the end portion 12a of the inner tube 12 and the end portion 13a of the outer tube 13, the end portion 12a of the inner tube 12 and the end portion 13a of the outer tube 13 are connected. Welding. Further, by fixing the guide portion 17 to the inner cylinder 12, the fixed cylinder 16 is prevented from coming out of the inner cylinder 12. By preventing the fixed cylinder 16 from coming off from the inner cylinder 12 in this way, the shaft 11 of the handle H to which the fixed cylinder 16 is fixed is also prevented from being detached from the inner cylinder 12.

An outer cylinder 13 is fixed to the outer periphery of the inner cylinder 12, and the outer cylinder 13 is formed by winding a strip made of synthetic resin around a mandrel in a spiral shape and fixing the strips to each other in that state. Is formed into a cylindrical shape.
A brush portion 14 made of a chemical fiber, sponge, or the like is fixed to the outer periphery of the outer cylinder 13 as described above. Then, by including a paint in the brush portion 14, the paint or the like can be applied to a wall or a floor.

Further, as shown in FIG. 2, the outer cylinder 13 has a length L1 in the axial direction longer than a length L2 of the inner cylinder 12 in the axial direction. In other words, the axial length L2 of the inner cylinder 12 is shorter than the axial length L1 of the outer cylinder 13. Therefore, when the outer cylinder 13 is attached to the outer periphery of the inner cylinder 12, the outer cylinder 13 protrudes from the end 12 b of the inner cylinder 12.
The protruding portion of the outer cylinder 13 is heated by a heater (not shown) or the like to be softened. When softened in this way, it is bent together with the brush portion 4 as shown in FIG. Then, the bent portion, that is, the bent portion 20 of the outer cylinder 13 is thermally welded to the inner surface of the inner cylinder 12 on the end 12b side.
When the outer cylinder 13 is bent as described above, the outer cylinder 13 can be bent with the end 12b of the inner cylinder 12 as a fulcrum, so that the outer cylinder 13 can be bent into the inner cylinder 12 cleanly.

As described above, when the bent portion 20 of the outer cylinder 13 is thermally welded to the inner surface of the inner cylinder 12 on the end 12b side, the inner cylinder 12 and the outer cylinder 13 are welded only at both ends thereof. Become. Therefore, the welding area can be reduced as compared with the conventional example in which the entire joining surface of the inner cylinder and the outer cylinder has to be welded. And if the welding area is reduced in this way, the working cost for the welding work is reduced, so that the manufacturing cost can be reduced.
Further, since the end 13b of the outer cylinder 13 is bent to the inner side of the inner cylinder 12 and the bent portion 20 is welded to the inner surface of the inner cylinder 12, there is a difference in the amount of elongation between the inner cylinder 12 and the outer cylinder 13. Even if it exists, it can prevent reliably that the edge part 12b of the inner side cylinder 12 protrudes from the edge part 13b of the outer side cylinder 13. FIG.
Furthermore, since the inner cylinder 12 and the outer cylinder 13 are welded at both ends thereof, even if there is a difference between the extension amount of the inner cylinder 12 and the extension amount of the outer cylinder 13, both of them are bent. Nor.

In the second embodiment shown in FIG. 3, the inner cylinder 12 is provided with an intrusion prevention wall 21, and the same components as those in the first embodiment are given the same reference numerals.
The intrusion prevention wall 21 is provided in the vicinity of the welded portion of the inner cylinder 12 where the bent portion 20 of the outer cylinder 13 is welded.
The reason why such an intrusion prevention wall 21 is provided is to prevent the paint that has entered from the bent portion of the outer cylinder 13 from entering the inside of the intrusion prevention wall 21. That is, as described above, since the bent portion 20 of the outer cylinder 13 is positively welded to the inner surface of the inner cylinder 12, a gap A is inevitably formed in the bent portion 20 of the outer cylinder 13. This gap can be blocked to some extent by the brush portion 14, but cannot be completely blocked.

  Accordingly, the paint enters the roller body R through the gap A. When the infiltrated paint enters into the roller body R, the roller body R becomes heavier by the amount of the entered paint. When the roller body R becomes heavy in this way, workability deteriorates. In addition, when the paint that has entered the roller body R is hardened, the inner cylinder 12 becomes difficult to rotate with respect to the shaft 11. That is, when the paint enters the roller body R, various inconveniences occur in the painting operation.

In order to eliminate such an inconvenience, in the second embodiment, an intrusion prevention wall 21 is provided in the vicinity of the welded portion 20 in the inner cylinder 12. If the intrusion prevention wall 21 is provided at such a position, even if the gap A is opened in the bent portion 20 of the outer cylinder 13, a large amount of paint does not enter. Therefore, the inconvenience that the roller main body R becomes heavy due to the infiltrated paint can be prevented.
Further, since the intrusion prevention wall 21 is provided outside the through hole 15a that rotatably supports the shaft 11, the infiltrated paint does not reach the through hole 15a, and the rotation of the roller body R is obstructed. No inconvenience occurs.
In the second embodiment, the intrusion prevention wall 21 is a separate member from the inner cylinder 12, but the intrusion prevention wall 21 may be integrally formed with the inner cylinder 12.

In the third embodiment shown in FIG. 4, an extension member 22 is connected to the inner cylinder 12, and the same components as those in the first and second embodiments are given the same reference numerals.
The extension member 22 has a cylindrical shape with the same outer diameter as that of the inner cylinder 12 and includes an intrusion prevention wall 23 therein. The intrusion prevention wall 23 is for preventing the ingress of paint as in the second embodiment.
The extension member 22 is formed with a connecting portion 24 on the right side of the drawing. The connecting portion 24 has an outer diameter that can be inserted into the opening of the inner cylinder 12, and as shown in the drawing, when the connecting portion 24 is inserted into the opening of the inner cylinder 12, both of them are integrated. Yes.

  By integrating the inner cylinder 12 and the extension member 22 in this manner, the outer cylinder 13 having different axial lengths can be accommodated. That is, the outer cylinder 13 may be long if it has a short axial length depending on the type and application of the product. The preparation of the inner cylinder 12 having different axial lengths in accordance with the length of the outer cylinder 13 has a problem in that the manufacturing cost and the management cost are increased.

In order to solve such a problem, in the third embodiment, the inner cylinder 13 having a length corresponding to the outer cylinder 12 having a short axial length is basically used. And when the axial direction length of the inner side cylinder 12 is insufficient compared with the axial direction length of the outer side cylinder 13, the axial direction length of the inner side cylinder 12 is used by using the extension member 22 of required length. To adjust.
The extension member 22 does not need the through-hole 15a for supporting the shaft 11 as in the case of the inner cylinder 12, so that the extension member 22 does not need to support the shaft 11. Therefore, its strength is low enough.
Accordingly, the preparation of the extending members 22 having different lengths in the axial direction according to the outer cylinder 13 is less expensive than the case of preparing the inner cylinders 12 having different lengths in the axial direction. Can be cheap.

By the way, in the said 1st-3rd embodiment, although the inner side pipe | tube 12 and the outer side pipe | tube 13 are welded via the flange part 17a of the guide pipe | tube 17, the welding structure of the inner side cylinder 12 and the outer side cylinder 13 is the same. However, the present invention is not limited to this.
For example, the end portion 12a of the inner cylinder and the end portion 13a of the outer cylinder may be directly welded without using the flange portion.

It is sectional drawing of 1st Embodiment. It is sectional drawing of the roller main body R which shows the state before bending the end of an outer cylinder. It is sectional drawing of 2nd Embodiment. It is sectional drawing of the roller main body of 3rd Embodiment. It is sectional drawing of a prior art example. It is explanatory drawing which shows the assembly | attachment state of a prior art example.

Explanation of symbols

H handle 11 shaft 12 inner cylinder 12a end 12b corresponding to the other end of the inner cylinder of the present invention 12b end corresponding to one end of the inner cylinder of the present invention 13 outer cylinder 13a end corresponding to the other end of the outer cylinder of the present invention Part 13b End part corresponding to one end of the outer cylinder of the present invention 14 Brush part 20 Bending part of the outer cylinder 21 Intrusion prevention wall

Claims (2)

  A brush portion is provided on the outer peripheral surface, and an outer cylinder formed by winding a resin in a spiral shape, and an inner cylinder made of resin having an axial length shorter than that of the outer cylinder while being inserted into the outer cylinder, For coating where one end of the outer cylinder is bent inside the inner cylinder, the bent part is welded to the inner surface of one end of the inner cylinder, and the other end of the inner cylinder is welded to the other end of the outer cylinder on the handle shaft insertion port side roller.   2. The painting roller according to claim 1, wherein an intrusion prevention wall is provided on the inner cylinder in the vicinity of the welded portion where one end of the outer cylinder is welded.

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