JP2004358308A - Painting roller - Google Patents

Abstract

An object of the present invention is to provide a coating roller capable of maintaining a bonding force between a core member and a support cylinder even when the core member swells.
In order to solve the above-mentioned problem, the present invention provides a thermoplastic resin support member A rotatably supporting a rod 2 on a thermoplastic resin core member 20 having a brush portion 19 on the outer periphery. In the coating roller for inserting and fixing the fixing member, a part F of the supporting member A is welded to one end 20a of the core member 20.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating roller used when applying a paint contained in a cover to a wall surface or the like.
[0002]
[Prior art]
As this kind of coating roller, for example, a roller described in Patent Document 1 is conventionally known.
As shown in FIG. 5, the conventional coating roller has a cover 2 detachably attached to a rod 2 provided on a grip 1.
As shown in FIG. 6, the cover C includes a core member 3 made of a thermoplastic resin, and a brush portion 4 fixed to the outer periphery of the core member 3. Is inserted. The support cylinder 5 is fixed to the core member 3 by heat welding. That is, the support cylinder 5 is inserted into the core member 3 in a state where the surface of the support cylinder 5 and the inner surface of the core member 3 are respectively melted by the heater, and the melted portion is solidified. 5 is fixed.
[0003]
The support tube 5 has a support portion 6 formed therein, and the rod 2 is rotatably supported by the support portion 6 as shown in FIG.
In addition, a fixing pipe 7 made of a thermoplastic resin having radial elasticity is incorporated in the support cylinder 5. The fixed pipe 7 has such a size that it cannot pass through the support portion 6, and has an inner diameter slightly smaller than the outer diameter of the rod 2 before the rod 2 is inserted. As shown, when the rod 2 is inserted while the diameter of the fixed pipe 7 is increased, the fixed pipe 7 is fixed to the outer periphery of the rod 2 by its elastic force.
[0004]
A guide cylinder 8 made of a thermoplastic resin is press-fitted and fixed to one end of the support cylinder 5. The guide tube 8 includes a flange portion 8a, and the flange portion 8a is inserted until it comes into contact with one end of the support tube 5. When the guide tube 8 is inserted into the support tube 5 in this way, the amount of movement of the fixed pipe 7 in the axial direction is regulated by one end of the guide tube 8 and the support portion 6. However, since a gap is provided on both sides of the fixed pipe 7, the fixed pipe 7 rotates smoothly with respect to the support cylinder 5.
[0005]
As described above, the amount of movement of the fixed pipe 7 in the axial direction in the support cylinder 5 is restricted. Therefore, if the rod 2 is fixed to the fixed pipe 7, the rod 2 will not fall out of the support cylinder 5. That is, by inserting the rod 2 into the fixed pipe 7, the cover C can be attached to the rod 2.
At this time, the rod 2 is supported at two places, that is, the support portion 6 and the guide tube 8.
On the other hand, if the rod 2 is pulled strongly and the rod 2 is pulled out from the fixed pipe 7, the rod 2 can be removed from the cover C and the cover C can be easily replaced.
[0006]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-023743 (FIG. 3)
[0007]
[Problems to be solved by the invention]
In the above-described conventional example, the surface of the support cylinder 5 and the inner surface of the core member 3 are fixed by heat welding. If too much heat is applied to the welded portion, when the support cylinder 5 is inserted into the core member 3, the heated portion may be deformed, resulting in a poor assembly. If heat is moderately applied in order to prevent such assembling defects, there is a possibility that welding will be defective in this case. In other words, the degree of application of heat to the welded portion is very delicate, and it is difficult to determine the conditions, so that there has conventionally been a problem that the welding failure rate is increased.
[0008]
Further, if the welding conditions are inappropriate and the strength of the welded portion is set to a low value, the position of the core member 3 with respect to the support cylinder 5 may be shifted during the painting operation. That is, the core member 3 is swelled by the thinner contained in the paint and has an increased inner diameter. When the inner diameter of the core member 3 is increased as described above, the bonding force between the core member 3 and the support cylinder 5 is reduced. descend. Therefore, if the strength of the welded portion is set to be low, the position of the core member 3 with respect to the support cylinder 5 is shifted due to the swelling of the core member 3. If the position of the core member 3 with respect to the support cylinder 5 is slightly displaced in this way, it becomes difficult to perform the painting operation, and if the core member 3 is completely removed from the support cylinder 5, the brush There is also a problem that the cover C or the like must be replaced with a new one even though the part 4 can still be used.
[0009]
As described above, if it is desired to weld the core member 3 and the support cylinder 5 well, it is necessary to melt both the core member 3 and the support cylinder 5. However, in such a case, it is necessary to raise the temperature of both of them to the heat deformation temperature or higher, so that the rate of occurrence of assembly failure increases accordingly. In addition, it is necessary to control the dimensional accuracy between the core member 3 and the support cylinder 5 with high accuracy, which causes a problem that the cost is increased.
[0010]
Further, conventionally, the length of the support cylinder 5 is set to be substantially the same as the entire length of the core member 3 and the contact area between them is increased to increase the coupling force.
However, even if the contact area between the core member 3 and the support cylinder 5 is increased, if the inner diameter of the core member 3 increases due to swelling, the bonding force is reduced. It could not be prevented. Conversely, the longer the entire length of the support cylinder 5, the heavier the cover C becomes, resulting in a problem that the work efficiency at the time of painting is deteriorated.
An object of the present invention is to provide a coating roller capable of solving the various problems described above.
[0011]
[Means for Solving the Problems]
A first invention is a coating roller in which a thermoplastic resin supporting member for rotatably supporting a rod is inserted into and fixed to a thermoplastic resin core member having a brush portion on an outer periphery. A part of the support member is welded to one end.
[0012]
According to a second aspect, in the first aspect, a welding allowance is provided at one end of the core member or one end of the support member, and the fusion allowance is melted. Is characterized in that it is welded to one end.
[0013]
According to a third aspect, in the first aspect, a flange portion is provided at one end of the support member, a welding allowance is provided inside the flange portion, and the welding allowance is melted. The core member is welded to one end.
[0014]
According to a fourth aspect, in the first to third aspects, the core member and the support member are welded by ultrasonic welding.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 4 show a first embodiment of the present invention.
As shown in FIG. 1, a support member A is inserted into the inner periphery of a thermoplastic resin core member 20 having a brush portion 19 fixed to the outer periphery.
As shown in FIG. 2, the support member A includes a support tube 10, a guide tube 11, and a fixed pipe 12. After the fixed pipe 12 is installed in the support tube 10, the guide tube 11 is attached to one end of the support tube 10. By press-fitting the insertion portion 11a, a single coherent part is formed.
[0016]
In addition, the support member A is provided with predetermined ends on both sides of the fixed pipe 12 while restricting the axial movement of the fixed pipe 12 by one end of the guide tube 11 and a support portion 10 a provided in the support tube 10. By providing the gap, smooth rotation of the fixed pipe 12 with respect to the support cylinder 10 is allowed.
Then, by inserting the rod 2 into the fixed pipe 12, the fixed pipe 12 is fixed to the outer periphery of the rod 2.
[0017]
On the other hand, the guide tube 11 is made of a thermoplastic resin, and has a flange portion F on the side opposite to the insertion portion 11a.
The guide cylinder 11 is provided with an enlarged diameter portion 14 adjacent to the inside of the flange portion F. The enlarged diameter portion 14 corresponds to the welding allowance of the present invention, and has an outer diameter larger than an inner diameter of the core member 20.
Further, the guide cylinder 11 has concave portions 15 and 16 formed in the circumferential direction, and a plurality of ribs 17 perpendicular to the concave portions 15 and 16 are formed in the axial direction.
Note that the rod 2 is supported at two positions, that is, the guide tube 11 and the support portion 10a.
[0018]
Next, a procedure for fixing the bearing member A to the core member 20 will be described.
First, the support member A is inserted into the core member 20, as shown in FIG. When the support member A is inserted into the core member 20, the enlarged diameter portion 14 is pressed against one end 20a of the core member 20.
With the enlarged diameter portion 14 pressed against one end 20a of the core member 20, the enlarged diameter portion 14 is melted by ultrasonic welding means (not shown). In this way, as shown in FIG. 4, the flange portion F abuts on one end 20 a of the core member 20 using the melted enlarged diameter portion 14 as a welding margin. Then, the flange portion F of the support member A is fixed to one end 20a of the core member 20 by cooling and hardening of the melted portion.
[0019]
As described above, when the support member A is pushed into the core member 20, a part of the melted enlarged diameter portion 14 enters the concave portion 15. Therefore, the melted enlarged diameter portion 14 does not flow out of the flange portion F.
[0020]
As described above, according to the first embodiment, the flange portion F of the support member A is welded to the one end 20a of the core member 20 using the enlarged diameter portion 14 provided on the support member A as a welding margin. Even if the core member 20 swells due to the thinner contained in the paint, the bonding force between the core member 20 and the support member A does not decrease.
Therefore, it is possible to prevent inconveniences such as the support member A and the core member 20 being shifted during the painting operation and the core member 20 being detached from the support member A.
[0021]
Further, since the flange portion F of the support member A is welded to one end 20a of the core member 20, the core member 20 can be formed without delicate temperature control and dimensional control having a large diameter as in the related art. The assembly failure between the support member A and the support member A does not occur. Therefore, a product with stable performance can be supplied, and the cost of the product can be reduced because the need for delicate temperature control and high dimensional control is eliminated.
Furthermore, since the flange portion F of the support member A is welded to one end 20a of the core member 20, it is not necessary to increase the welding area in the axial direction, and the support member A can be shortened. In addition, the cost of parts can be reduced by reducing the length of the support member A.
[0022]
In the first embodiment, the flange portion F provided on the support member A is welded to one end 20a of the core member 20, but a part of the support member A may be welded to one end 20a of the core member 20. If possible, the shape of the flange portion F may be any. However, as in this embodiment, if the flange portion F is used, the support member A can be welded to the entire periphery of the one end 20a of the core member 20 via a welding allowance. it can.
[0023]
In the second embodiment shown in FIG. 5, an inclined surface 20b is formed at one end 20a of the core member 20, and the enlarged diameter portion 14 is melted and welded to the inclined surface 20b.
According to the second embodiment as well, the end 20a side of the core member 20 and the flange portion F of the support member A can be welded, so that the same effect as in the first embodiment can be obtained.
In the third embodiment shown in FIG. 6, a convex portion 21 is formed in an annular shape at one end 20a of the core member, and this convex portion 21 is welded to the flange portion F as a margin for welding. That is, in the third embodiment, a welding margin is provided on the support member A side. Even in this case, the same effect as in the first embodiment can be obtained.
[0024]
Further, in the first embodiment, the enlarged diameter portion 14 serving as a welding margin is melted, and the melted welding margin is welded to the one end 20a of the core member 20, so that the core member 20 and the support member A are securely connected. Can be welded. However, as in the fourth embodiment shown in FIG. 7, the enlarged diameter portion 14 may be omitted, and a part 22 of the flange portion F may be directly welded to the inclined surface 20b of the core member 20.
[0025]
In the first to fourth embodiments, the core member 20 and the flange portion F are ultrasonically welded using the ultrasonic welding means. However, the core member 20 and the flange portion F are welded using the heater. May be thermally welded. That is, the welding method of the core member 20 and the supporting member A may be any method. However, if welding is performed using ultrasonic waves, the core member 20 and the support member A can be quickly and reliably welded.
[0026]
The support member A is constituted by the support tube 10, the guide tube 11, and the fixed pipe 12. The flange portion F is directly formed at one end of the support tube 10, and the function of the guide tube 11 is changed. , The support tube 10 and the guide tube 11 may be integrated. In addition, if the function of the fixed pipe 12 is given to the support cylinder 10, the fixed pipe 12 may be omitted. That is, the support member of the present invention may be formed of a single member as long as it has the functions of the support tube 10, the guide tube 11, and the fixed pipe 12.
[0027]
【The invention's effect】
According to the first aspect, since the support member is partially welded to one end of the core member, even if the core member swells, the coupling force between the core member and the bearing member does not decrease.
Therefore, inconveniences such as the core member and the bearing member being displaced during the painting operation and the bearing member coming off from the core member can be prevented.
[0028]
According to the second invention, the welding margin provided at one end of the core member or the one end of the support member is melted, and the molten welding margin is welded to one end of the support member or one end of the core member. The core member and the support member can be securely connected.
[0029]
According to the third aspect, the welding margin is provided inside the flange portion of the support member, and the welding margin is melted and welded to one end of the core member. Can be fixed. With this configuration, the bonding force between the core member and the flange can be increased.
[0030]
According to the fourth aspect, since the core member and the support member are welded by ultrasonic welding, the welding operation can be performed quickly and reliably.
[Brief description of the drawings]
FIG. 1 is a sectional view of a first embodiment.
FIG. 2 is a partial sectional view showing a support member A of the first embodiment.
FIG. 3 is an explanatory view showing a state before a support member A is welded to a cover C;
FIG. 4 is an explanatory view showing a state after the support member A is welded to the cover C.
FIG. 5 is a partial sectional view of the second embodiment.
FIG. 6 is a partial sectional view of a third embodiment.
FIG. 7 is a partial sectional view of a fourth embodiment.
FIG. 8 is a perspective view showing a conventional example.
FIG. 9 is a cross-sectional view of a cover C and the like of a conventional example.
[Explanation of symbols]
A Supporting member 2 Rod 14 Enlarged diameter portion 15 Depressed portion 19 Brush portion 20 Core member 20a Corresponding to welding margin of the present invention One end F of core member F Flange portion

Claims (4)

In a coating roller in which a thermoplastic resin supporting member for rotatably supporting a rod is inserted into and fixed to a thermoplastic resin core member having a brush portion on the outer periphery, at one end of the core member, A coating roller that is partially welded. The welding margin is provided at one end of the core member or one end of the support member, and the fusion margin is melted, and the melted welding margin is welded to one end of the support member or one end of the core member. The coating roller described. A flange portion is provided at one end of the support member, a welding margin is provided inside the flange portion, the welding margin is melted, and the melted welding margin is welded to one end of the core member. Item 7. A coating roller according to Item 1. The coating roller according to any one of claims 1 to 3, wherein the core member and the support member are welded by ultrasonic welding.

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