JP2007082723A - Coupling structure of pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coupling structure which simplifies the coupling operation. <P>SOLUTION: In the coupling structure of pipes 20, 30, the inserting portion 21 of a male pipe 20 is inserted into the opening portion 31 of a female pipe 30, the boss 23 of the male pipe 20 is allowed to go into the guide groove 32 of the female pipe 30, the boss 23 is engaged into an engaging groove 33 from the guide groove 32 of the female pipe 30 by forwardly rotating the male pipe 20 to make it possible to couple both the pipe 20, 30, a lock ring 40 is moved in an axial direction to position a boss piece like stopper 41 outside of the crossing portion of the guide groove 32 and the engaging groove 33, the boss 23 of the male pipe 20 is allowed to escape from the engaging groove 33 to the guide groove 32 by rearwardly rotating the male pipe 20 to make it possible to draw out the inserting portion 21 of the male pipe 20 from the opening portion 31 of the female pipe 30 while allowing the boss 23 to go out from the guide groove 32. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a pipe connection structure suitable for use as a handle of a cleaning tool.

In the handle of the cleaning tool as described in Patent Document 1, a plurality of pipes are connected to form a long handle. As a pipe connection structure, a structure in which a male thread part provided at one pipe end and a thread part for screwing to be provided at the other pipe end are employed.
JP2004-8415

  In the conventional pipe connection structure, since the male thread part provided at one end of the pipe and the thread part provided at the other pipe end are screwed together, it takes time to perform the connection work.

  An object of the present invention is to simplify the connection work in a pipe connection structure.

  According to the first aspect of the present invention, the enlarged diameter portion is provided on the proximal end side of the outer periphery of the insertion portion of the male pipe, the protrusion is provided on the distal end side of the outer periphery of the insertion portion, and extends from the opening end to the inner periphery of the opening portion of the female pipe. A guide groove is provided, and a locking groove that intersects the guide groove is provided on the back side of the inner periphery of the opening, and a through-hole extending over a certain axial range including the intersection of the guide groove and the locking groove of the female pipe The lock ring is attached to the outer periphery of the female pipe, and the protruding piece-like stopper provided on the inner surface of the lock ring is inserted into the through hole of the female pipe, and the lock ring is moved in the axial direction of the female pipe. The stopper can be positioned inside and outside the intersection of the guide groove and locking groove, the male pipe insertion part is inserted into the opening of the female pipe, the male pipe protrusion is inserted into the female pipe guide groove, and the male pipe is The protrusion is inserted into the locking groove from the guide groove of the female pipe, the pipes can be connected, the lock ring is moved in the axial direction, and the protruding piece stopper is outside the intersection of the guide groove and the locking groove. The male pipe is rotated in the reverse direction so that the projection of the male pipe is withdrawn from the locking groove into the guide groove, and the male pipe insertion portion can be pulled out from the opening of the female pipe while the projection is withdrawn from the guide groove. It is a thing.

  According to a second aspect of the present invention, in the first aspect of the invention, the diameter-expanded portion of the male pipe is further expanded from a diameter smaller than the inner diameter of the female pipe to a larger diameter, and a distance a from the opening end of the female pipe to the locking groove is increased. The distance from the base end portion including the enlarged diameter portion of the male pipe to the protrusion is larger than the distance b and smaller than the distance c from the enlarged diameter starting point of the enlarged diameter portion of the male pipe to the protrusion.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the lock ring is attached to the outer periphery of the female pipe by a resilient holding force, and the top of the protruding piece-like stopper of the lock ring faces the guide groove. A chamfered portion is provided, and a stationary convex portion provided on the inner surface of the lock ring is engaged with and disengaged from the penetrating locking groove of the female pipe.

(Claim 1)
(a) When connecting both pipes, insert the insertion part of the male pipe into the opening of the female pipe, insert the protrusion of the male pipe into the guide groove of the female pipe, rotate the male pipe forward and lock the protrusion from the guide groove of the female pipe Engage in the groove. Both pipes can be easily connected by simply inserting a male pipe and rotating it forward.

  Note that the lock ring is stopped at the lock position where the entrance (intersection) of the locking groove is closed by the protruding piece-like stopper (locked state). Thereby, the projection of the male pipe engaged with the locking groove of the female pipe is held by the protruding piece-like stopper of the lock ring.

  (b) When separating both pipes, move the lock ring in the axial direction to position the protruding piece stopper at the unlocked position outside the intersection of the guide groove and locking groove (unlocked state), and rotate the male pipe in the reverse direction. Then, the projection of the male pipe is withdrawn from the locking groove into the guide groove, and the insertion portion of the male pipe is pulled out from the opening of the female pipe while the projection is withdrawn from the guide groove. Both pipes can be easily separated simply by moving the lock ring in the axial direction and then rotating the male pipe backward and pulling it out. Since the axial movement operation (unlock operation) of the lock ring is required, both pipes are not accidentally separated during cleaning.

(Claim 2)
(c) The diameter-expanded portion of the male pipe is expanded from a diameter smaller than the inner diameter of the female pipe to a larger diameter, and the distance a from the opening end of the female pipe to the locking groove is determined from the base end including the diameter-expanded portion of the male pipe. It was set larger than the distance b to the protrusion and smaller than the distance c from the diameter expansion start point of the expanded portion of the male pipe to the protrusion. Therefore, when the male pipe is rotated forward at the insertion end of the male pipe (a) and the projection of the male pipe is engaged with the locking groove from the guide groove of the female pipe, the R surface of the projection follows the entrance angle of the locking groove. However, since the male pipe is drawn in the axial direction, the enlarged diameter portion of the male pipe is drawn into the inner diameter of the female pipe, and a connected state without backlash is obtained.

(Claim 3)
(d) The lock ring is attached to the outer periphery of the female pipe by a resilient hugging force. The elastic force of the lock ring maintains the state where the protruding piece-like stopper of the lock ring penetrates into the through hole of the female pipe. When the male pipe is rotated forward to engage the male pipe protrusion into the locking groove from the female pipe guide groove, the protrusion moves the stopper over the top of the protruding piece stopper and the protrusion moves the stopper against the elastic force of the lock ring. Then, the stopper is returned by the elastic force of the lock ring to close the locking groove, and the protrusion is held in the locking groove.

  (e) A chamfered portion is provided in which the top of the protruding stopper of the lock ring faces the guide groove. Thus, when the protrusion (d) is engaged with the locking groove from the guide groove of the female pipe, the protrusion can easily ride over the top of the protruding piece stopper. Note that the top of the protrusion-shaped stopper does not have a chamfered portion on the side facing the locking groove, and it is not easy for the protrusion to get over the top of the stopper from the locking groove.

  (f) The retaining convex part of the lock ring is engaged with and disengaged from the through-type engaging groove of the female pipe. The lock ring can be stably stopped at the lock position where the lock ring closes the locking groove by the protruding piece-like stopper.

  As shown in FIGS. 1 and 2, the cleaning tool 10 has a support arm 13 coupled to a distal end portion of a handle 11 via a joint 12 so as to be swingable in the left-right direction intersecting the cleaning direction. The frame 15 is supported on the portion 13A via the pivot portion 14 so as to be swingable in the front-rear direction along the cleaning direction.

  The cleaning tool 10 supports the scraping body 16 and the contact rotating body 17 on the front and rear sides along the cleaning direction of the frame 15, and rolls up the scraping body 16 and the contact rotating body 17 on the floor surface. An adhesive roll (not shown) straddling the body 16 and the contact rotating body 17 is provided, and a dust removal part (not shown) is provided at the rear of the cleaning body 16 in the cleaning direction. In FIG. 2, 18 is an adhesive roll holder, and 19 is a rear cover of the dust collector.

The cleaning operation by the cleaning tool 10 is performed as follows.
(1) The cleaning tool 10 is advanced while the scraping body 16 and the contact rotating body 17 are pressed against the floor surface via the frame 15 by the operating force applied in the axial direction of the handle 11, and the scraping body 16 and the contacting rotating body 17 are moved forward. , And at the same time, the adhesive roll is rotated in the direction opposite to the scraping body 16.

  (2) When the scraping body 16 scoops up the dust on the floor surface, the dust is sent to the side of the adhesive roll and is adsorbed and captured by the adhesive surface of the adhesive roll. Large garbage is sent to the dust collector and captured.

  (3) When it is visually confirmed that a large amount of dust has been captured all around the adhesive surface of the adhesive roll, the adhesive roll holder 18 is opened, and one turn of the adhesive sheet is peeled, cut and removed to expose the new adhesive surface. .

(4) When it is visually confirmed that a large amount of dust has accumulated in the dust collector, the rear cover 19 is opened and the dust in the dust collector is discarded.
The cleaning tool 10 can move not only forward but also backward.

  Hereinafter, the structure of the handle 11 will be described. The handle | steering_wheel 11 is the connection body which couple | bonded the several pipe in order with those connection parts. The connecting structure of the pipes in each connecting part is substantially the same. In this embodiment, as shown in FIGS. 2 and 3, the male pipe connected by the connecting part closest to the joint 12 in the handle 11. The connection structure of 20 and the female pipe 30 will be described as a representative.

The connection structure of the male pipe 20 and the female pipe 30 is as follows.
(1) The enlarged diameter portion 22 is provided on the proximal end side of the outer periphery of the cylindrical insertion portion 21 of the male pipe 20, and the protrusion 23 is provided on the distal end side of the outer periphery of the insertion portion 21. In this embodiment, the protrusions 23 are provided at two positions through 180 degrees in the circumferential direction of the outer periphery of the insertion portion 21.

  The outer diameter of the insertion portion 21 is slightly smaller than the inner diameter of the female pipe 30. The expanded diameter portion 22 has a tapered shape that expands from a diameter slightly smaller than the inner diameter of the female pipe 30 to a larger diameter. The enlarged diameter portion 22 may be a rib shape.

  (2) A guide groove 32 extending in the axial direction from the opening end is provided on the inner periphery of the cylindrical opening 31 of the female pipe 30, and a locking groove 33 that intersects the guide groove 32 is provided on the inner periphery of the opening 31. . The locking groove 33 of this embodiment has a hole shape that penetrates the wall of the female pipe 30. In the present embodiment, the guide groove 32 and the locking groove 33 are provided at two positions through 180 degrees in the circumferential direction of the inner periphery of the opening 31. The groove width of the guide groove 32 is larger than the diameter of the protrusion 23 of the male pipe 20.

  The distance a from the opening end of the female pipe 30 to the locking groove 33 is larger than the distance b from the base end portion including the enlarged diameter portion 22 of the male pipe 20 to the projection 23, and the diameter expansion starting point of the enlarged diameter portion 22 of the male pipe 20 Is set to be smaller than the distance c from the projection 23 (FIG. 3).

  A through hole 34 that penetrates the wall of the female pipe 30 is provided over a certain axial range including the intersection of the guide groove 32 and the locking groove 33 of the female pipe 30. The axial length J of the through hole 34 is set to be larger than the sum of the groove width K of the locking groove 33 and the length L of the protruding piece-like stopper 41 of the lock ring 40 described later.

  (3) The lock ring 40 is attached to the outer periphery of the female pipe 30. The protruding piece stopper 41 provided on the inner periphery of the lock ring 40 is inserted into the through hole 34 of the female pipe 30, and the locking ring 40 is moved in the axial direction of the female pipe 30. It can be positioned at the inside and outside of the intersection of the locking groove 33 (the entrance of the locking groove 33) (the lock position that closes the entrance of the locking groove 33 and the unlocking position that is away from the entrance of the locking groove 33). In this embodiment, the protruding piece-like stopper 41 is provided at two positions through 180 degrees in the circumferential direction of the inner periphery of the lock ring 40.

  As shown in FIG. 4, the lock ring 40 has a C-shaped ring shape having a habit of elastically attaching to the outer periphery of the female pipe 30, and is attached to the outer periphery of the female pipe 30 by its own elastic attachment force. As shown in FIG. 5, the lock ring 40 restricts the circumferential mounting position on the female pipe 30 by opposing both ends of the C-shape to both ends of the protrusion 35 provided on a part of the circumferential direction of the female pipe 30. Thus, the protruding piece-like stopper 41 can be inserted into the through hole 34 of the female pipe 30. The C-shaped both ends of the lock ring 40 are in contact with the protrusion 35 of the female pipe 30 without a gap, so that the lock ring 40 can be spread out with fingers and removed from the female pipe 30.

  The lock ring 40 can move in the axial direction of the female pipe 40 between the annular ribs 36 </ b> A and 36 </ b> B provided at two front and rear positions along the axial direction on the outer periphery of the female pipe 30. On the outer periphery of the lock ring 40, a multi-stage ridge grip 42 suitable for the user's fingers to impart an axial movement force is provided.

  The lock ring 40 has a retaining projection 43 projecting from the side of the projecting piece-like stopper 41 so that the retaining projection 43 can be engaged and disengaged from the outer peripheral side of the female pipe 30 to the penetrating locking groove 33. When the retaining convex portion 43 engages with the locking groove 33 of the female pipe 30, the lock ring 40 is positioned at the lock position (FIG. 6A), and the stationary convex portion 43 is detached from the locking groove 33 of the female pipe 30. At this time, the lock ring 40 is positioned at the unlock position (FIG. 6B).

  The lock ring 40 includes a chamfered portion 41A that faces the guide groove 32 in a state where the lock ring 40 is attached to the female pipe 30 at the top of the protruding piece-like stopper 41 (FIGS. 3 to 5).

(4) Connection operation of the male pipe 20 and the female pipe 30 (FIGS. 7 and 8).
The insertion part 21 of the male pipe 20 is inserted into the opening 31 of the female pipe 30, the protrusion 23 of the male pipe 20 is inserted into the guide groove 32 of the female pipe 30 (FIG. 7), and then the male pipe 20 is rotated forward to make the protrusion 23 the female pipe. The guide grooves 32 of 30 are engaged with the locking grooves 33 to connect the pipes 20 and 30 (FIG. 8).

At this time, the following effects are obtained.
(a) When both pipes 20 and 30 are connected, the insertion part 21 of the male pipe 20 is inserted into the opening 31 of the female pipe 30, the protrusion 23 of the male pipe 20 is inserted into the guide groove 32 of the female pipe 30, and the male pipe 20 is rotated forward. Then, the protrusion 23 is engaged with the locking groove 33 from the guide groove 32 of the female pipe 30. Both pipes 20 and 30 can be simply connected by simply inserting the male pipe 20 and rotating it forward.

  The lock ring 40 is stopped at a lock position where the entrance (intersection) of the locking groove 33 is blocked by the protruding piece-like stopper 41 (locked state). Thereby, the projection 23 of the male pipe 20 engaged with the locking groove 33 of the female pipe 30 is held by the protruding piece-like stopper 41 of the lock ring 40.

  (b) The diameter-expanded portion 22 of the male pipe 20 is expanded from a diameter smaller than the inner diameter of the female pipe 30 to a larger diameter, and the distance a from the opening end of the female pipe 30 to the locking groove 33 is 22 is set to be larger than the distance b from the base end portion including the protrusion 22 to the protrusion 23 and smaller than the distance c from the diameter expansion start point of the expanded diameter portion 22 of the male pipe 20 to the protrusion 23. Therefore, when the male pipe 20 is rotated forward at the insertion end of the male pipe 20 of the above-described (a) and the protrusion 23 of the male pipe 20 is engaged with the locking groove 33 from the guide groove 32 of the female pipe 30, the R surface of the protrusion 23 is Since the male pipe 20 is pulled in the axial direction while following the entrance angle of the locking groove 33, the enlarged diameter portion 22 of the male pipe 20 is drawn into the inner diameter of the female pipe 30 so that there is no backlash.

  (c) The lock ring 40 is attached to the outer periphery of the female pipe 30 by a resilient attachment force. The elastic force of the lock ring 40 maintains the state where the protruding piece-like stopper 41 of the lock ring 40 is inserted into the through hole 34 of the female pipe 30. When the male pipe 20 is rotated forward and the projection 23 of the male pipe 20 is engaged with the locking groove 33 from the guide groove 32 of the female pipe 30, the projection 23 moves in the process of riding over the top of the projecting stopper 41. After the stopper 41 is pushed outward against the elastic force of the lock ring 40 and the protrusion 23 is engaged with the engaging groove 33, the stopper 41 is returned and locked by the elastic force of the lock ring 40. The groove 33 is closed and the projection 23 is held in the locking groove 33.

  (d) A chamfered portion 41 </ b> A in which the top of the projecting piece-like stopper 41 of the lock ring 40 faces the guide groove 32 is provided. Thereby, when the protrusion 23 of the above-mentioned (c) is engaged with the locking groove 33 from the guide groove 32 of the female pipe 30, the protrusion 23 can easily ride over the top of the protruding piece-like stopper 41. It should be noted that the top of the protrusion-shaped stopper 41 does not have a chamfered portion on the side facing the locking groove 33, and it is not easy for the projection 23 to get over the top of the stopper 41 from the locking groove 33.

  (e) The retaining convex portion 43 of the lock ring 40 is engaged with and disengaged from the penetrating engagement groove 33 of the female pipe 30. The lock ring 40 can be stably stopped at the lock position where the lock ring 40 closes the locking groove 33 by the protruding piece-like stopper 41.

(5) Separation operation of male pipe 20 and female pipe 30 (FIG. 9)
By moving the lock ring 40 in the axial direction, the protruding piece-like stopper 41 is positioned outside the intersection of the guide groove 32 and the locking groove 33 (unlocked position), and the male pipe 20 is reversely rotated to engage the protrusion 23 of the male pipe 20. The guide groove 32 is withdrawn from the stop groove 33 (FIG. 9), and the insertion portion 21 of the male pipe 20 is pulled out from the opening 31 of the female pipe 30 while the projection 23 is withdrawn from the guide groove 32.

At this time, the following effects are obtained.
When the pipes 20 and 30 are separated, the lock ring 40 is moved in the axial direction so that the protruding piece stopper 41 is positioned at the unlocking position outside the intersection of the guide groove 32 and the locking groove 33 (unlocked state). 20 is rotated reversely to cause the projection 23 of the male pipe 20 to escape from the locking groove 33 to the guide groove 32, and the insertion portion 21 of the male pipe 20 is moved to the opening 31 of the female pipe 30 while the projection 23 is retracted from the guide groove 32. Pull out from. The pipes 20 and 30 can be easily separated simply by moving the lock ring 40 in the axial direction and then rotating the male pipe 20 backward and pulling it out. Since the axial movement operation (unlock operation) of the lock ring 40 is required, the pipes 20 and 30 are not accidentally separated during cleaning.

FIG. 1 is a perspective view showing the entire cleaning tool. FIG. 2 is a perspective view showing a main part of the cleaning tool. FIG. 3 is a perspective view showing a male pipe and a female pipe. FIG. 4 shows a lock ring, (A) is a front view, and (B) is an end view. FIG. 5 is a cross-sectional view showing a female pipe. 6A and 6B show a connection structure of a male pipe and a female pipe, where FIG. 6A is a sectional view showing a locked state, and FIG. 6B is a sectional view showing a unlocked state. FIG. 7 is a sectional view showing a male pipe insertion process. FIG. 8 is a cross-sectional view showing the male pipe forward rotation process. FIG. 9 is a cross-sectional view showing a male pipe drawing process.

Explanation of symbols

20 Male pipe 21 Insertion part 22 Expanded part 23 Protrusion 30 Female pipe 31 Opening part 32 Guide groove 33 Locking groove 34 Through hole 40 Lock ring 41 Projection piece-shaped stopper 41A Chamfered part 43 Retaining convex part

Claims (3)

While providing an enlarged diameter portion on the base end side of the outer periphery of the insertion portion of the male pipe, and providing a protrusion on the distal end side of the outer periphery of the insertion portion,
A guide groove extending from the opening end is provided on the inner periphery of the opening of the female pipe, and a locking groove that intersects with the guide groove is provided on the inner periphery of the opening, and the guide groove of the female pipe intersects with the locking groove. Providing a through hole over a certain range in the axial direction including the part,
The lock ring is attached to the outer periphery of the female pipe, and the protruding piece stopper provided on the inner surface of the locking ring is inserted into the through hole of the female pipe, and the locking ring is moved in the axial direction of the female pipe to It can be positioned inside and outside the intersection of the guide groove and locking groove,
Insert the insertion part of the male pipe into the opening of the female pipe, let the protrusion of the male pipe enter the guide groove of the female pipe, rotate the male pipe forward to engage the protrusion from the guide groove of the female pipe into the locking groove, Make it connectable,
Move the lock ring in the axial direction, position the protruding piece stopper outside the intersection of the guide groove and the locking groove, reversely rotate the male pipe and let the projection of the male pipe escape from the locking groove to the guide groove. A pipe connection structure that allows the insertion part of the male pipe to be pulled out from the opening of the female pipe while retreating from the guide groove. Expand the diameter-expanded part of the male pipe from a smaller diameter than the inner diameter of the female pipe to a larger diameter,
The distance a from the opening end of the female pipe to the locking groove is larger than the distance b from the base end portion including the enlarged diameter portion of the male pipe to the projection, and the distance c from the diameter expansion start point of the enlarged diameter portion of the male pipe to the projection The pipe connection structure according to claim 1, wherein the pipe connection structure is set smaller. The lock ring is attached to the outer periphery of the female pipe by a resilient holding force, and includes a chamfered portion where the top of the protruding piece-like stopper of the lock ring faces the guide groove,
The pipe connection structure according to claim 1 or 2, wherein a stationary convex portion provided on an inner surface of the lock ring is engaged with and disengaged from a penetrating locking groove of the female pipe.

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