JP2001200817A - Pipe connection structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe connection structure capable of effectively preventing a looseness and a damage from occurring on a connection part even if a bending stress is produced in the connection part and easily connecting a pair of cylindrical pipes integrally with each other in axial direction with a simple structure. SOLUTION: In this connection structure, the end part 13 with reduced diameter of one cylindrical pipe 11 is inserted into the opening 15 at the end part 14 of the other cylindrical pipe 12 to form a connection part 16 and, using a sleeve member 17 disposed while covering the connection part 16, a pair of cylindrical pipes 11 and 12 are connected integrally with each other in the axial direction. Projection insert holes 18 and 19 are formed at the end parts 13 and 14 of the pair of cylindrical pipes 11 and 12 on the peripheral surfaces thereof, respectively. The sleeve member 17 comprises an engagement projection 20 projected from the inner peripheral surface thereof to the inside. A wedge pin 24 is lockingly inserted from the outside of the sleeve member 17 into a pin insert hole 21 for the engagement projection 20, and the engagement projection 20 is expanded in diameter in the overlapped projection insert holes 18 and 19 so as to lock the connection part 16.

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 integrally connecting a pair of cylindrical pipes in the axial direction, a sleeve member used for the connecting structure, and a cleaning tool.

[0002]

2. Description of the Related Art A long rod-shaped member 51 such as a handle of a cleaning tool 50 or a handle of a cane shown in FIG. 4 connects a plurality of cylindrical pipes 52 in an axial direction. It may be formed integrally. As a structure of the connecting portion 53 for connecting and integrating the cylindrical pipes 52, for example, a female screw body having a female screw on the inner peripheral surface is provided at an opening at each end of the pair of cylindrical pipes 52 to be connected. A pair of cylindrical pipes 52, 52 are attached by mounting the pair of female screw bodies facing each other and screwing a male screw body having an external thread on the outer peripheral surface to both of the female screw bodies that are arranged opposite to each other.
Is known.

According to the structure of the conventional connecting portion 53, in addition to the screwing of the female screw body and the male screw body, the loosening of the female screw body is suppressed by the frictional force between the end faces of the female screw bodies that are opposed and abutted. It is composed. Therefore, when a bending stress is applied to the connecting portion 53, a gap is generated between the end faces that come into contact with each other, so that a frictional force cannot be obtained, the screwing between the female screw member and the male screw member is easily loosened, and the connecting portion 53 is bent and damaged. It will be easier. Further, according to the structure of the above-described conventional connecting portion 53, the structure is complicated.

The present invention can effectively prevent loosening or breakage of the connecting portion even when bending stress is applied to the connecting portion, and easily connect a pair of cylindrical pipes in the axial direction with a simple structure. An object of the present invention is to provide a pipe connecting structure that can be integrated, a sleeve member used for the connecting structure, and a cleaning tool.

[0005]

According to the present invention, a reduced-diameter end of one cylindrical pipe is inserted into an opening at an end of the other cylindrical pipe to form a connecting portion, and the connecting portion is disposed so as to cover the connecting portion. A connecting structure for connecting and integrating the pair of cylindrical pipes in the axial direction by using a sleeve member to be formed, wherein each pair of cylindrical pipes constituting the connecting portion has a projection inserted into a peripheral surface thereof. Holes are formed, and the sleeve member has an engagement projection that projects inward from the inner peripheral surface thereof and is inserted and locked in the projection insertion hole, and the engagement projection has a pin insertion hole. A hollow projection capable of achieving the above object by providing a connecting structure of a pipe for locking the connecting portion by inserting and locking a wedge pin into the pin insertion hole.

The present invention also relates to a sleeve member used for the pipe connecting structure, wherein the sleeve member has an inner diameter which is mounted so as to cover the connecting portion, and is provided with a notch over the entire length in the axial direction. A sleeve body elastically deformable so as to expand in diameter, an expandable hollow engagement projection having a pin insertion hole, protruding inward from an inner peripheral surface of the sleeve body, and being inserted into the pin insertion hole. The above object has been attained by providing a sleeve member comprising a wedge pin which is locked to expand the engagement projection.

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

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A pipe connecting structure according to a preferred embodiment of the present invention has a cleaning plate on which a cleaning sheet member for wiping a floor or the like is attached, and an upright standing from the cleaning plate. Of a cleaning tool consisting of a handle provided
This handle is used when a plurality of cylindrical pipes are connected and integrated in the axial direction and provided (see FIG. 4). That is, the cleaning tool is disassembled into parts such as a cleaning plate and a cylindrical pipe for convenience of transportation and sale, and these parts are put together into a product, and these parts are assembled and used at the time of use. I do.

Then, the pipe connecting structure 1 of the present embodiment.
0 is adopted at a connection point of each pair of cylindrical pipes 11 and 12 constituting a handle composed of a plurality of cylindrical pipes, as shown in FIGS. The reduced-diameter end portion 13 is inserted into the opening 15 of the end portion 14 of the other cylindrical pipe 12 to form a connecting portion 16 (see FIG. 3), and a sleeve member 17 disposed over the connecting portion 16 is used. A pair of cylindrical pipes 11 and 12 are connected and integrated in the axial direction.

At each end 13, 14 of a pair of cylindrical pipes 11, 12 constituting the connecting portion 16, circular projection insertion holes 18, 19 are formed on the peripheral surfaces thereof, respectively. And an engagement projection 20 that projects inward from the inner peripheral surface thereof and is inserted and locked in the projection insertion holes 18 and 19. The engaging projection 20 is an expandable hollow projection having a pin insertion hole 21, and the sleeve member 1 is inserted into the pin insertion hole 21.
By inserting and locking the wedge pin 24 from outside the 7, the engaging projection 20 is expanded in the overlapping projection insertion holes 18 and 19 to lock the connecting portion 16 (see FIG. 3C).

Each of the cylindrical pipes 11 and 12 has an outer diameter of 1 mm.
6 mm, having a hollow cross section with a size of about 1 mm in thickness,
It is a metal (aluminum) cylindrical pipe member having a length of about 250 mm. The end 13 of one cylindrical pipe 11 has an outer diameter 14 of about t = 25 mm at the end.
mm, and the reduced end 13
Is inserted into the opening 15 at the end 14 of the other cylindrical pipe 12 so that the end 13 of the one cylindrical pipe 11 and the end 14 of the other cylindrical pipe 12 are overlapped in close contact, about 25 mm. The connecting portion 16 having a double structure having a length of? The edge 35 of one of the cylindrical pipes 11 is beveled at its corner so as to be smoothly inserted into the opening 15 of the other cylindrical pipe 12. .

The end 13 of one cylindrical pipe 11
Is equipped with a two-stage diameter reduction structure in which the outer peripheral surface is reduced in diameter to a length of about 10 mm toward the tip with a steep slope, and then gradually reduced in diameter with a gentle slope over a length of about t = 25 mm. ing. The end portion 14 of the other cylindrical pipe 12 has a slope whose inner peripheral surface gradually matches the gentle slope of the reduced diameter end portion 13 over a length of about 25 mm toward the tip. It has a diameter. Therefore, the end 13 of one cylindrical pipe 11 is inserted into the opening 15 of the end 14 of the other cylindrical pipe 12, and the steep portion, which is the base end 36 of the reduced diameter portion, is inserted into the other cylindrical pipe 12. The ends 13 and 14 can be easily brought into close contact by making contact with the edge of the opening 15 of the pipe 12 (see FIG. 3B).

In the state where the base end 36 of the reduced diameter portion of one cylindrical pipe 11 is in contact with the edge of the opening 15 of the other cylindrical pipe 12, the connecting portion 16 having a double structure is appropriately connected. By sliding in the circumferential direction, each of the projection insertion holes 18, 18 is positioned so that the projection insertion hole 18 of the one cylindrical pipe 11 can easily match the projection insertion hole 19 of the other cylindrical pipe 12. An opening 19 is formed.

A projecting slide guide groove 27 (see FIG. 2) extending from the end of the cylindrical pipe 11 to the projecting insertion hole 18 is formed in the reduced-diameter end 13 of the cylindrical pipe 11.
A shallow concave section having a width corresponding to the outer diameter of the cylindrical pipe 11 is formed in the axial direction of the cylindrical pipe 11. By forming the projection slide guide groove 27, as described later,
When the end portion 13 of one cylindrical pipe 11 is inserted into the opening 15 of the end portion 14 of the other cylindrical pipe 12, the engagement protrusion that projects inward from the protrusion insertion hole 19 of the other cylindrical pipe 12. If the projection 20 is arranged in the slide guide groove 27 (see FIG. 2B), the engaging projection 20 automatically and smoothly moves along the slide guide groove 27 toward the projection insertion hole 18. The pair of projection insertion holes 18 and 19 can be easily overlapped without sliding the one cylindrical pipe 11 in the circumferential direction.

The sleeve member 17 has an inside diameter capable of covering the connecting portion 16 and is provided with a cut 23 over the entire length in the axial direction, so that the sleeve member 17 is elastically deformed so as to enlarge the inside diameter. Possible sleeve body 22
And an inflatable hollow engaging projection 20 projecting inward from the inner peripheral surface of the sleeve body 22 and having a pin insertion hole 21, and an engaging projection 20 inserted and locked in the pin insertion hole 21.
And a wedge pin 24 for expanding the opening.

The sleeve body 22 is a cylindrical member having a length of about 30 mm made of, for example, a synthetic resin (plastic). In addition, the sleeve body 22 has a notch 23 formed linearly over the entire length in the axial direction.
From the state having an inner diameter of about 6 mm, the notch 23
The circumferential length of the sleeve body 2
2 can be elastically deformed radially outward to expand the diameter,
In the state where the diameter is expanded, the sleeve body 22 generates a biasing force inward in the radial direction due to its elasticity.

At a position facing the cut 23, the engagement projection 20 extends inward from the inner peripheral surface of the sleeve body 22.
It protrudes with a protruding length of about mm. In addition, the engagement protrusion 2
0 is formed integrally with the thick reinforcing portion 25 of the sleeve body 22 provided on the side opposite to the cut 23. The engagement projection 20 is a cylindrical hollow projection having a pin insertion hole 21 provided through the center thereof. An outer opening of the pin insertion hole 21 is opened at a pin mounting opening 26 formed on the outer peripheral surface of the thick reinforcing portion 25, and approximately half of the outer side has an inner diameter of about 3 mm. The inner diameter is reduced as a conical tapered portion 28 toward. And the engagement protrusion 20
It is divided into four in the circumferential direction by four split slits 33 extending in the axial direction of the pin insertion hole 21, and when the wedge pin 24 is inserted and locked in the pin insertion hole 21 as described later, the tapered portion 28 is formed. The engagement protrusion 20 is expanded by being pushed and expanded and elastically deformed.

The wedge pin 24 is made of a synthetic resin (plastic) of the same material as that of the sleeve main body 22, and has a disk-shaped pressing portion 29 sized to fit in the pin mounting opening 26 of the sleeve main body 22, and a center of the pressing portion 29. Wedge part 30 protruding from
Consists of The wedge portion 30 has a cylindrical portion 3 having an outer diameter of about 3 mm.
1 and a conical portion 32 provided at the tip of the cylindrical portion 31. The cylindrical portion 31 is substantially equal to the entire length of the pin insertion hole 21 opened at the outer end portion of the pin mounting opening 26.
It has a length of about mm. Thereby, the wedge pin 2
When the wedge portion 30 of No. 4 is inserted into the pin insertion hole 21, the cylindrical portion 31 penetrates substantially the entire length of the pin insertion hole 21 so as to push and expand the tapered portion 28, and the engagement protrusion 20 is expanded. Locked. Note that the wedge pin 24 is
Is connected to the sleeve main body 22 via a connection band 34 integrally attached to the end of the sleeve.

According to the connecting structure 10 of the present embodiment, the pair of cylindrical pipes 11, 12 can be easily connected and integrated in the axial direction by a simple structure using the sleeve member 17. That is, the diameter of the sleeve member 17 is increased as necessary by increasing the interval between the cuts 23, and the sleeve member 17 is mounted on the outer peripheral surface of the end portion 14 of the other cylindrical pipe 12 in a close contact state. It is inserted into the hole 19 and made to protrude from the inner surface of the other cylindrical pipe 12 (see FIGS. 3A and 2B). In addition, the end 1 of the other cylindrical pipe 12 of the sleeve member 17
It is preferable that the attachment to the device 4 be performed in advance at a factory or the like.

Thereafter, the reduced-diameter end 13 of one cylindrical pipe 11 is connected to the end 14 of the other cylindrical pipe 12.
Into the opening 15. As a result of the insertion operation, the engagement protrusion 20 is brought into contact with the outer peripheral surface of the end portion 13 of one of the cylindrical pipes 11, and is pushed upward in the radial direction by the elasticity of the sleeve member 17. It slides along the groove 27. When the projection insertion hole 18 of one cylindrical pipe 11 overlaps with the projection insertion hole 19 of the other cylindrical pipe 12, the sleeve member 17 whose diameter has been increased.
The engagement projection 20 is pushed down by the elastic urging force of
With the snapping sound, it is easily and smoothly inserted and locked into the protrusion insertion hole 18 of the one cylindrical pipe 11 (see FIG. 3B).

The protrusion insertion hole 18 of one cylindrical pipe 11 and the protrusion insertion hole 1 of the other cylindrical pipe 12 overlap each other.
When the engagement projection 20 is inserted and locked in the projection 9, these projection insertion holes 18 and 19 do not completely coincide with each other, and the pipes 11 and 12 are displaced in a direction away from each other (FIG. 3). (Refer to the reference symbol s in (b)). According to the present embodiment, the pipes 11 and 12 are drawn toward each other so as to eliminate the displacement s, and
And tightly adheres the reduced-diameter end 13 of one cylindrical pipe 11 and the end 14 of the other cylindrical pipe 12 to easily prevent the connection portion 16 from rattling. be able to.

That is, the overlapping projection insertion holes 18,
19, a pin insertion hole 21 of an engagement projection 20
The wedge pin 24 is connected to the pin mounting opening 2 of the sleeve main body 22.
6, the engaging projection 20 expands to fill the projection insertion holes 18, 19 and is pressed against the inner wall surfaces thereof, and the projection insertion holes 18, 19 are pushed in the direction in which the centers of the holes match. While sliding, the one cylindrical pipe 11 and the other cylindrical pipe 12 are drawn toward each other (see FIG. 3C). Thereby, the play of the connecting portion 16 is eliminated, and the end portions 13 and 14 of the pair of pipes 11 and 12 are locked in a state in which they are firmly adhered to each other, so that the play of the connecting portion 16 is effectively avoided. become. The distal end of the engagement projection 20 expands larger than the diameter of the projection insertion hole 18 of one of the cylindrical pipes 11 and the side surface is crushed.
The deviation of the center of the projection insertion holes 18 and 19 caused by the error in the diameter of the protrusions is absorbed.

According to the connecting structure 10 of the present embodiment, the connecting portion 16 is connected to the end 13 of one of the cylindrical pipes 11.
And the end 14 of the other cylindrical pipe 12 have a double structure in which they are closely arranged with a considerable length (in the present embodiment, 25 mm).
Even if a large bending stress is applied to 6, the wrap portion of the double structure can sufficiently support the bending stress,
Looseness or breakage of the connecting portion 16 can be effectively avoided. Further, in particular, the cylindrical pipes 11, 12
Is a metal pipe member, so that it can exert a stronger supporting force against bending stress.

That is, according to the present embodiment, the connecting portion 1
6 can effectively prevent loosening or breakage of the connecting portion 16 even when bending stress is applied, and easily connect and integrate the pair of cylindrical pipes 11 and 12 in the axial direction with a simple structure. Can be.

The present invention is not limited to the above embodiment, but can be variously modified. For example, the protrusion insertion hole does not necessarily have to be circular, and may be elliptical, oval, or the like. Also, the connection of the wedge pin to the sleeve body in the sleeve member does not necessarily need to be through a connection band, and a wedge pin is provided inside a lid body hinged to the sleeve body so as to be openable and closable. The wedge pin can also be inserted and locked in the pin insertion hole by opening and closing.

Further, the present invention is not limited to the handle of the cleaning tool, but may be any of various long rods formed by integrally connecting a plurality of cylindrical pipes such as an indicator rod and a cane in the axial direction. It can be adopted as a connection structure of a cylindrical pipe in a member.

[0027]

According to the pipe connecting structure of the present invention, the sleeve member used for the connecting structure, and the cleaning tool, even if bending stress is applied to the connecting portion, it is possible to effectively prevent the connecting portion from being loosened or damaged. In addition, it is possible to easily form a pipe connection structure that can easily connect and integrate a pair of cylindrical pipes in the axial direction with a simple structure.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a pair of cylindrical pipes connected by a pipe connection structure according to an embodiment of the present invention.

2 (a) is an exploded perspective view illustrating a pipe connecting structure according to an embodiment of the present invention, and FIG.
It is a longitudinal perspective view along A.

FIGS. 3A, 3B, and 3C are cross-sectional views illustrating a pipe connection structure according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a cleaning tool provided with a conventional pipe connection structure.

[Explanation of symbols]

 Reference Signs List 10 Pipe connection structure 11 One cylindrical pipe 12 The other cylindrical pipe 13 End (reduced end of one cylindrical pipe) 14 End (end of other cylindrical pipe) 15 Opening 16 Connection Part 17 Sleeve member 18 Projection insertion hole 19 Projection insertion hole 20 Engagement projection 21 Pin insertion hole 22 Sleeve body 23 Cutout 24 Wedge pin 27 Projection slide guide groove 28 Tapered part 29 Pressing part 30 Wedge part 33 Split slit

Claims (3)

[Claims] 1. A reduced diameter end of one cylindrical pipe is inserted into an opening at an end of the other cylindrical pipe to form a connection part,
A connecting structure for connecting and integrating the pair of cylindrical pipes in the axial direction using a sleeve member disposed over the connecting portion, wherein each end of the pair of cylindrical pipes forming the connecting portion is Each has a projection insertion hole formed on the peripheral surface thereof, and the sleeve member has an engagement projection that protrudes inward from the inner peripheral surface thereof and is inserted and locked in the projection insertion hole. A pipe connecting structure, which is an expandable hollow projection having a pin insertion hole, wherein the wedge pin is inserted and locked in the pin insertion hole to lock the connecting portion. 2. A sleeve member for use in a pipe connection structure according to claim 1, wherein the sleeve member has an inner diameter that is mounted so as to cover the connection portion, and a cut is provided over the entire length in the axial direction. A sleeve body elastically deformable so as to expand in diameter, an expandable hollow engagement projection having a pin insertion hole, protruding inward from an inner peripheral surface of the sleeve body, and being inserted into the pin insertion hole. A wedge pin which is locked and expands the engagement protrusion. 3. A cleaning tool having a handle formed by connecting and integrating cylindrical pipes in the axial direction by the pipe connecting structure according to claim 1.