JP2003148426A - Connecting structure of pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connecting structure of a pipe, capable of holding the adhesion between the outer peripheral surface of a male side end part and the inner peripheral surface of a female side end part not to damage the inner peripheral surface of the female side end part in inserting the male side end part, and effectively avoiding looseness or the like in the connecting part. SOLUTION: In this pipe connecting structure 10, the male side end part 13 of one cylindrical pipe 11 is inserted in the female side end part 14 of the other cylindrical pipe 12 to axially connect and integrate a pair of cylindrical pipes 11, 12 with each other. In the forward end part of the male side end part 13, the inside edge part of the tip is chamfered 21, and then drawn, thereby providing a tip curved surface 20 curved inward pointing the tip and also reduced in diameter. A male side projecting engagement hole 15 is formed in the male side end part 13, and aligned with a female side projecting engagement hole 16 formed in the female side end part 14. An engagement projection 17 is locked in the aligned engagement holes 15, 16 to hold the connected and integrated state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe connecting structure for axially connecting and integrating a pair of cylindrical pipes, and a cleaning tool using the connecting structure.

[0002]

2. Description of the Related Art For example, a long rod-shaped member 51 such as a handle of a cleaning tool 50 or a handle of a cane shown in FIG. 8 connects a plurality of cylindrical pipes 52 in an axial direction. It may be integrally formed. As a structure of the connecting portion 53 for connecting and integrating the cylindrical pipe 52, generally, a structure by screw connection is known. The connection structure by screw connection disassembles the cleaning tool 50 when the cleaning tool 50 is assembled, when the cleaning tool 50 is compactly housed, when the length of the handle 51 is changed, or when the cleaning tool 50 is discarded. In doing so, the work of rotating the cylindrical pipe 52 for screwing and fastening and releasing it has been troublesome.

On the other hand, by inserting the male side end of one tubular pipe into the female side end of the other tubular pipe to form a double pipe structure, a pair of tubular pipes There has been proposed a connection structure that connects and integrates in the direction. In such a connection structure, there is known a method of chamfering the outer edge of the male side end into a taper shape so that the male side end can be easily inserted into the female side end.

However, when chamfering the outer edge of the male end, the rear end corner of the chamfered portion is exposed on the outer peripheral surface of the male end, so that the male side is exposed. When inserting the end, it is easy to damage the inner peripheral surface of the female side end by this corner, and unevenness due to scratches or scraps are generated on the inner peripheral surface, and the outer peripheral surface of the male side end The adhesion of the female-side end portion to the inner peripheral surface is hindered, which may cause rattling or the like at the connecting portion. Especially when the tubular pipe is made of a metal such as aluminum and the outer peripheral surface is covered with a film layer of a material harder than the material of the inner portion, the rear end of the tapered chamfered portion. Since the film layer made of a hard material forms the edge portion at the corner portion, the inner peripheral surface of the female-side end portion made of the soft material is more likely to be scratched, and the possibility of rattling at the connecting portion is remarkable. Become.

According to the present invention, when the male side end is inserted, the inner peripheral surface of the female side end is not damaged, and the outer peripheral surface of the male side end and the inner peripheral surface of the female side end are adhered to each other. SUMMARY OF THE INVENTION An object of the present invention is to provide a pipe connecting structure capable of effectively holding back pipes and effectively preventing rattling of the connecting portion, and a cleaning tool using the connecting structure.

[0006]

SUMMARY OF THE INVENTION According to the present invention, a male side end of one tubular pipe is inserted into a female side end of the other tubular pipe to integrally couple a pair of tubular pipes in an axial direction. In the connecting structure of the pipe, the tip of the male end is
The chamfering process is performed on the inner edge of the tip, and then the squeezing process is performed to provide a pipe connecting structure having a tip curved surface that reduces in diameter while curving inward toward the tip. It is a thing.

Further, the present invention has achieved the above object by providing a cleaning tool having a handle formed by integrally connecting cylindrical pipes in the axial direction by the pipe connecting structure.

According to the present invention, the male end portion is provided with a tip curved surface formed by subjecting the inner edge portion of the tip end to chamfering and then subjecting it to drawing processing. It becomes easier to insert the male side end into the female side end through the tip curved surface that is reduced in diameter toward the female side end, and the tip curved surface is smoothly curved from the rear portion of the male side end while contracting inward. Since it has a diameter, unlike the conventional chamfering process of the tapered outer edge of the tip, the corners are not exposed on the outer peripheral surface, and therefore contact with the inner peripheral surface when inserting it into the female end However, it is possible to effectively prevent the inner peripheral surface from being damaged by the curved tip surface.

Further, since the male end portion is chamfered on the inner edge of the front end, it becomes easy to bend the front end portion inward when the end portion is inserted into a mold or the like and drawn. It is possible to facilitate drawing and smoothly form the tip curved surface without causing buckling or the like of the tubular pipe due to excessive pressing force. In addition, since the inner edge of the tip is chamfered, even if the tip is curved inwardly, the inner surface of the tip will protrude beyond the surface extending the inner surface of the rear part. Therefore, for example, when inserting the cored bar inside the male side end to form the male side projection engaging hole or the like in the male side end, the insertion work of the cored bar is not hindered.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A pipe connecting structure according to a preferred embodiment of the present invention includes a cleaning plate to which a cleaning sheet member for wiping and cleaning a floor or the like is attached, and a cleaning plate standing upright from the cleaning plate. It is adopted when the handle of the cleaning tool that is provided with the handle is provided by integrally connecting a plurality of cylindrical pipes in the axial direction (see FIG. 8). The cleaning tool is disassembled into parts such as a cleaning plate and a cylindrical pipe for the convenience of transportation and sale, and these parts are put together into a product and are assembled and used at the time of use. At the time of storage or disposal, these parts will be appropriately disassembled.

Then, the pipe connecting structure 1 of the present embodiment
No. 0 is adopted at the connecting portion of each pair of cylindrical pipes 11 and 12 forming a handle composed of a plurality of cylindrical pipes, and as shown in FIG. 1, FIG. 3, and FIG. The male side end 13 of the cylindrical pipe 11 is inserted into the female side end 14 of the other cylindrical pipe 12, and the pair of cylindrical pipes 11 and 12 are connected and integrated in the axial direction X.

Further, according to this embodiment, the male side end portion 1
3, a male side projection engaging hole 15 is formed, and is matched with a female side projection engaging hole 16 formed in the female side end portion 14,
By mounting the sleeve member 19 having the fitting pin 17 as the engaging projection protruding from the inner peripheral surface from the outside, and fitting and locking the fitting pin 17 in the fitted engaging holes 15 and 16, The pair of cylindrical pipes 11 and 12 firmly holds the connected and integrated state.

According to this embodiment, the tip portion of the male end 13 is chamfered on the inner edge of the tip to form the inner chamfer 21, and then drawn to face the tip. And a tip curved surface 20 that is curved inward while being reduced in diameter (see FIGS. 5 and 6).

Each of the cylindrical pipes 11 and 12 is a metal (aluminum) pipe member having a circular hollow cross section. The male side end 13 of one cylindrical pipe 11 has a reduced diameter, and this reduced male side end 13 has a distal end opening 30 of the female side end 14 of the other cylindrical pipe 12.
(See FIG. 4), the connecting portion 18 has a double structure in which the male side end portion 13 of the one cylindrical pipe 11 and the female side end portion 14 of the other cylindrical pipe 12 overlap in close contact with each other.
Is formed. Further, according to the present embodiment, the outer peripheral surfaces of the cylindrical pipes 11 and 12 are covered with a film layer of, for example, alumite, so that the outer peripheral surface is made of a material harder than the material of the inner portion, for example, aluminum. Has become.

The male-side end portion 13 of one cylindrical pipe 11
After the outer peripheral surface is once reduced in diameter as a steep slope portion 32,
The diameter is gradually reduced toward the tip with a gentle slope.
The female-side end portion 14 of the other cylindrical pipe 12 has an inner peripheral surface whose diameter increases toward the tip end at a slope that matches the gentle slope of the male-side end portion 13. Therefore, at the male side end 13 of one of the cylindrical pipes 11, the steep slope 32 is provided at the tip end opening 3
The male side end 13 and the female side end 14 can be easily brought into close contact with each other in the connecting portion 18 by inserting the female side end 14 through the tip opening 30 until they come into contact with the 0 edge. Will be possible.

Further, in the state where the male side end portion 13 is inserted into the female side end portion 14 until the steep slope portion 32 comes into contact with the end edge portion of the tip end opening 30, the circular male side projection engaging hole 15 has the same diameter. The male side projection engaging hole 15 is formed at a position matching the circular female side projection engaging hole 16. On the outer peripheral surface of the male side end portion 13, a linear protrusion guide groove 33 is formed along the axial direction X from the edge portion of the male side end portion 13 to the male side protrusion engaging hole 15 (FIG. 1). The protrusion guide groove 33 is provided on the female side end portion 1 in which the sleeve member 19 is mounted in advance.
When the male side end portion 13 is inserted into the distal end opening 30 of 4, the fitting pin 17 that is inserted into the female side projection engaging hole 16 and projects inside the female side end portion 14 is provided on the distal end surface thereof. While locking the guide ribs 35 thus formed, the guide ribs 35 are slid and guided to the male side projection engagement holes 15.

According to this embodiment, the sleeve member 19
As shown in FIG. 2, the sleeve body 23 is provided with the fitting pin 17 protruding inward from the inner peripheral surface, and the male side end portion 13 and the female side end portion 1 are connected and integrated with the sleeve body 23.
4 is a cylindrical member made of synthetic resin (plastic) that includes an auxiliary sleeve 28 that covers the overlapping seam portion 27 (see FIG. 4) with four, and the male side end portion 13 of one cylindrical pipe 11 and the other end portion The connecting end 18 of the cylindrical pipe 12 and the female-side end 14 of the cylindrical pipe 12 are closely attached to each other, and are fitted to the mating engagement holes 15 and 16 while the fitting pin 17 is fitted and locked. It is a thing. The sleeve body 23 is provided with a pressing portion 24 that holds a space 25 (see FIG. 3) between the sleeve body 23 and the outer peripheral surface of the female-side end portion 14 at a portion facing the position where the fitting pin 17 projects. Press the pressing portion 24 to the female side end portion 1
4 is pressed in the Y direction toward the outer peripheral surface of the sleeve body 23.
By pushing the fitting pin 17 toward the fitting pin 17 side.
Is moved radially outward so that the engagement state of the fitting pin 17 with the male side projection engagement hole 15 can be released (see FIG. 4).

The auxiliary sleeve 28 of the sleeve member 19 is
When the male body end portion 13 is inserted into the female body end portion 14 to form the connecting portion 18 which is integrally connected to the one end surface of the sleeve body 23 on the side of the cylindrical pipe 11 and is formed into a step portion, the overlapping portion becomes a stepped portion. By being arranged so as to cover the seam portion 27,
The beauty of the connecting portion 31 is improved. Further, the fitting pin 17 in the axial direction X is provided on the outer peripheral surface of the auxiliary sleeve 28.
There is a guide strip 34 on the extension of the
A slit 29 is formed over the entire length of the auxiliary sleeve 28 on the extension of the pressing portion 24 of the sleeve main body 23 in the axial direction X at the portion opposite to 4. Auxiliary sleeve 2
8 is provided with the guide band 34, the protrusion guide groove 33 of the male side end portion 13 is aligned toward the fitting pin 17 via the guide band 34 while the male side end portion 13 is female. It becomes possible to smoothly insert into the side end portion 14, and the slit 29 is formed,
The sleeve body 23 is pressed by pressing the pressing portion 24 and the fitting pin 17
When pushed out to the side, the diameter of the auxiliary sleeve 28 can be expanded while widening the slit, so that the fitting pin 17 can be smoothly moved to the outside in the radial direction.

According to the present embodiment, the tip curved surface 20 of the male end portion 13 is subjected to drawing processing after the inner chamfer 21 is formed on the inner edge portion of the tip, as shown in FIGS. 5 and 6. Provided by. That is, for example, a conical rotary cutting body having an outer peripheral surface serving as a polishing surface is inserted into the tip end opening of the male side end portion 13, and chamfering is performed by cutting a corner of an inner edge portion of the opening to form a tapered inner surface. The chamfer 21 is formed. One cylindrical pipe 1 having an inner chamfer 21 formed thereafter
1 is inserted into a metal mold (die) 26 having an inner peripheral shape that follows the outer peripheral shape of the male-side end portion 13 whose diameter is reduced in two steps, while forcibly pushing from the tip portion. By such insertion, the male end portion 13 is bent while being narrowed inward along the shape of the mold 26, and the tip end portion of the mold 26 is
Abutting on the tip stepped portion 36 of. After abutting against the tip step 36, if a pressing force in the insertion direction is further applied,
The tip portion is bent so as to be drawn inward along the tip stepped portion 36, and by such drawing processing, the tip portion of the male side end portion 13 is turned inward toward the tip as shown in FIG. The tip curved surface 20 that is curved and has a reduced diameter is easily formed.

According to the present embodiment, the inner chamfer 21 is formed on the inner edge of the distal end of the one cylindrical pipe 11 prior to the drawing process, so that it is pressed against the mold 26. When drawing, it becomes easier to bend the tip part inward, and it does not cause buckling etc. due to excessive pressing force like a pipe without internal chamfering, making it easy to draw. The curved surface 20 can be formed smoothly. Further, since the inner chamfer 21 is formed on the inner edge portion of the tip, the inner side surface of the tip curved surface 20 extends the inner surface of the rear portion thereof even when the tip portion is curved inward. It does not protrude inside.

Further, according to this embodiment, the male-side projection engaging hole 15 and the projection guide groove 33 are formed in the male-side end portion 13 having the reduced diameter and the curved tip surface 20 formed therein.
In order to form these, as shown in FIG. 7, a cored bar 37 is inserted inside the male side end portion 13, and a punch punch 39 is driven toward the through hole 38 of the cored bar 37 by using this as a pedestal. As a result, the male side projection engaging hole 15 is formed, and the projection forming groove 33 is formed by hitting the groove forming punch 40. Here, since the inner side surface of the tip curved surface 20 does not extend inward from the surface P obtained by extending the inner side surface of the rear portion thereof, the cored bar 37 is smoothly moved inward from the tip opening of the male side end portion 13. Can be inserted into.

Further, according to the connecting structure 10 of the present embodiment, the pair of cylindrical pipes 1 is made by the following simple work.
It is possible to easily connect and integrate 1 and 12 in the axial direction X. That is, the sleeve member 21 is mounted, and the protrusion guide groove 33 is provided in the female side end portion 14 where the tip end portion of the fitting pin 17 projects inward from the inner peripheral surface through the female side protrusion engaging hole 16. While aligning with 34, the tip opening 3
When the male side end portion 13 is inserted via 0, the guide rib 35 of the fitting pin 17 rides on the protrusion guide groove 33 while pushing up the sleeve member 21, and slides along the protrusion guide groove 33. go. The steep slope portion 32 of the male side end portion 13 is inserted until it abuts on the edge portion of the tip opening 30, and the male side end portion 13 and the female side end portion 14 are brought into close contact with each other, and the male side projection engaging hole 15 and the female side When the side projection engaging holes 16 are aligned, the fitting pin 17 is pushed down by the elastic biasing force of the sleeve member 21 to be fitted and locked in the male side projection engaging holes 15, whereby the pair of cylindrical pipes 11 and 12 is engaged. Will be firmly and easily connected and integrated in the axial direction X. According to the present embodiment, a tapered female-side chamfer 41 is formed on the inner edge of the distal end opening 30 of the female-side end portion 14.
(See FIG. 4) is formed so that the insertion work of the male end portion 13 into the female end portion 14 can be performed more smoothly.

On the other hand, a cylindrical pipe 1 which is connected and integrated
To disassemble 1, 12, as shown in FIG.
8, the pressing portion 2 of the sleeve member 21 attached so as to cover
When 4 is pressed toward the fitting pin 17, the central portion of the sleeve member 21 from which the fitting pin 17 projects moves outward, so that the fitting pin 17 is locked in the male-side projection engaging hole 15. Since the state is released, the male end 13 is replaced by the female end 1.
Smoothly pull out from 4 to make a pair of cylindrical pipes 1
It is possible to easily dismantle 1,12.

According to this embodiment, since the tip end curved surface 20 is provided at the tip end portion of the male side end portion 13, the male side end portion 13 is inserted into the female side end portion 14 via the tip end curved surface 20. Moreover, since the tip curved surface 20 is smoothly continuous from the rear part of the tip curved surface and is curved inward and reduced in diameter, unlike the conventional tapered chamfering of the tip outer edge portion, Edge-shaped corners are not formed on the outer peripheral surface. Therefore, even when the tip curved surface 20 comes into contact with the soft inner peripheral surface of the female-side end portion 14 when inserted into the female-side end portion 14, the inner peripheral portion It is possible to effectively prevent the surface from being damaged. Also, from the female end 14 to the male end 1
Even when the tip curved surface 20 comes into contact with the soft inner peripheral surface of the female-side end portion 14 when pulling out 3, the inner peripheral surface can be effectively prevented from being damaged.

Therefore, according to this embodiment, the outer peripheral surface of the male end portion 13 and the female end portion 13 are prevented from damaging the inner peripheral surface of the female end portion 14 when the male end portion 13 is inserted. It is possible to maintain close contact with the inner peripheral surface of 14 and effectively prevent rattling of the connecting portion 18.

The present invention is not limited to the above embodiment, and various modifications can be made. For example, it is not always necessary to form a male side projection engagement hole in the male side end and match the female side projection engagement hole to lock the engagement protrusion, and insert the male side end into the female side end. The pair of tubular pipes may be connected and integrated only by doing so. Also,
The tubular pipe does not necessarily have to be an aluminum pipe, but may be another metal pipe or a synthetic resin pipe. Furthermore, the present invention is not limited to the handle of the cleaning tool, and is a cylinder in various other long rod-shaped members formed by connecting and integrating a plurality of cylindrical pipes in the axial direction, such as a stick handle. It can be used as a connecting structure for pipes.

[0027]

According to the pipe connecting structure and the cleaning tool using the connecting structure of the present invention, the male side is prevented from damaging the inner peripheral surface of the female side end when inserting the male side end. Adhesion between the outer peripheral surface of the end portion and the inner peripheral surface of the female side end portion can be maintained, and it is possible to effectively prevent rattling of the connecting portion.

[Brief description of drawings]

FIG. 1 is an exploded perspective view illustrating a pipe connecting structure according to an embodiment of the present invention.

FIG. 2 is a perspective view of the sleeve member as viewed obliquely from below.

FIG. 3 is a transverse cross-sectional view taken along the line AA of FIG. 4 in a locked state before pushing up the engaging protrusions, for explaining the pipe connecting structure according to the embodiment of the present invention.

FIG. 4 is a secondary cross-sectional view for explaining the pipe connecting structure according to the embodiment of the present invention, taken along the line BB of FIG. 3 and showing a state where the engagement protrusion is pushed up to release the locking.

FIG. 5 is an explanatory diagram of a situation in which a male end portion having a reduced diameter is processed and a tip curved surface is formed.

FIG. 6 is a vertical cross-sectional view showing a male-side end portion that has been drawn.

FIG. 7 is an explanatory diagram of a situation in which a male-side protrusion engaging hole and a protrusion guide groove are formed in the male-side end portion.

FIG. 8 is a perspective view showing a cleaning tool having a conventional pipe connecting structure.

[Explanation of symbols]

10 Pipe connection structure 11 One cylindrical pipe 12 The other cylindrical pipe 13 Male end 14 Female end 15 Male side projection engagement hole 16 Female side projection engaging hole 17 Fitting pin (engagement protrusion) 18 Connection 19 Sleeve member 20 Tip curved surface 21 Internal chamfer 23 Sleeve body 24 Pressing part 25 spaces 26 molds (dies) 28 Auxiliary sleeve 30 Tip opening 33 Protrusion guide groove 36 Tip step 37 core 39 Hole punch 40 groove forming punch X-axis direction

Continued front page    F-term (reference) 3B074 EE02                 3B104 AA02                 3J039 AA03 AB03 BB01 JA05 MA03

Claims (5)

[Claims] 1. A pipe connecting structure in which a male side end of one tubular pipe is inserted into a female side end of the other tubular pipe to axially connect and integrate a pair of tubular pipes. A connection structure of a pipe having a tip curved surface where a tip end portion of the male side end portion is chamfered on a tip inner side edge portion and then drawn to be curved inward toward the tip end while curving inward. . 2. A male-side protrusion engaging hole is formed in the male-side end portion, and the male-side protrusion engaging hole is aligned with the female-side protrusion engaging hole formed in the female-side end portion for engagement. The pipe connecting structure according to claim 1, wherein the projection is locked. 3. The pipe connecting structure according to claim 1, wherein the outer peripheral surface of the male end is covered with a film layer made of a material harder than the material of the inner portion. 4. The pipe connecting structure according to claim 1, wherein the one tubular pipe is a metal pipe. 5. A cleaning tool having a handle formed by integrally connecting cylindrical pipes in the axial direction by the pipe connecting structure according to any one of claims 1 to 4.