JPH07280145A - Connecting method for lead pipe and joint, and lead pipe end expanding device used therefor - Google Patents

Abstract

PURPOSE:To properly and easily connect a lead pipe without any water leakage by screwing a cap nut to a joint after capping an expanded pipe end to a taper end having a coupled annular packing. CONSTITUTION:A cap nut 61 is coupled to a lead pipe 51 from the side of an internally bulged flange 62, and a ring body 64 having internally tapered surface 65 is coupled thereto from the side of a small diameter section. Thereafter, the end of the pipe 51 is expanded like taper for the expansion of an end. The expanded end of the pipe 51 is, then, capped to the taper end 54 of a joint 53 having an annular packing 56 coupled to an annular groove 55 and, thereafter, the cap nut 61 is screwed to the external thread of the joint 53. According to this construction, the end of the pipe 51 can be kept in watertight contact with the packing 56 via the ring body 64, using the nut 61. Furthermore, a vinyl pipe 58 is connected to the other end of the pipe 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for connecting a lead pipe and a joint and a device for expanding the end portion of the lead pipe used in the method.

[0002]

2. Description of the Related Art Heretofore, the following methods have been known as a method of connecting a lead pipe of this type and a joint. That is, one having a step of simply fitting the lead pipe and the joint and a step of soldering the lead pipe and the joint is known.

[0003]

BACKGROUND OF THE INVENTION Recently, since the soldering work has been reduced, it has been desired to develop a method for connecting a lead pipe and a joint in a reliable and simple manner without water leakage, in addition to the conventional connection by soldering. Was there.

[0004]

[Means for Achieving the Object] The present invention employs the following means in order to achieve the object. According to the invention of claim 1, the step of fitting the cap nut to the lead pipe from the side of the inwardly projecting flange, the step of fitting the ring body, the inner peripheral surface of which is a tapered peripheral surface, to the lead tube from the side having a small inner diameter, and the lead tube end portion A step of expanding the taper shape so that the edge side expands, and a step of fitting the expanded lead pipe end part to the tapered end part of the joint, where the annular packing is fitted, and the cap nut of the joint part. The invention according to claim 2 further comprises: a threaded tubular member having a screw hole whose axial center is oriented in the left-right direction; and a lead tube fitting portion continuously provided on the lower left side of the threaded tubular member. A lower holding member, an upper holding member provided on the lower holding member so as to be vertically swingable and openable and closable by a pivot having an axis in the left-right direction, and a locking device for locking the upper holding member to the lower holding member And a male screwed into the screw hole It has a screw member and a lead tube expanding member having a tapered projection tapering to the left side, which is rotatably provided at the left end of this male screw member, and has a screw cylinder member and lower and upper holding members. A space for expanding the plumbing is formed between and.

[0005]

The present invention has the following functions. According to the invention of claim 1, the lead pipe and the joint can be connected reliably and easily without water leakage without a special technique of soldering. According to the invention of claim 2, the end portion of the lead pipe can be easily expanded into a tapered shape without impacting or hitting the lead pipe.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments with reference to the drawings. In this specification, the front means the front side in FIG. 1, the rear means the back side, the left means the left side in FIG. 1, and the right means the right side in FIG.

First, the expanding device 1 will be described. The expansion device 1 includes a screw cylinder member 3 having a screw hole 4 with an axis centered in the left-right direction, and a lower holding member 6 having a lead tube fitting portion 7 continuously provided on the lower left side of the screw cylinder member 3. And an upper holding having a lead tube fitting portion 13 which is vertically swingably opened and closed by a hinge mechanism 9 (see FIG. 4) including a pivot 10 having an axis centered in the left and right direction at a rear portion of the lower holding member 6. Member 1
2, a lock device 16 for locking the upper holding member 12 to the lower holding member 6, which will be described later in detail, a male screw member 31 screwed into the screw hole 4, and a left end of the male screw member 31 rotatable. And a lead tube expanding member 36 having a tapered protrusion 39 that is tapered toward the left side.

The locking device 16 is provided with a screw rod 18 provided on the front side of the lower holding member 6 so as to be vertically swingable by a pivot 17 having an axis centered in the left-right direction, and a cut-out into which the screw rod 18 is fitted. It has a receiving piece 20 provided on the front side of the upper holding member 12 having a notch 19, a washer 21 fitted to the screw rod 18, and a nut 22 screwed to the screw rod 18. With the above-described structure, the lead pipe 51 is fitted into the lead pipe fitting portion 7 with its axis oriented in the left-right direction, the upper holding member 12 is put on the lead pipe 51, and then the screw rod 18 is cut. The lead tube 51 can be clamped and fixed by fitting it into the notch 19 and then pressing the nut 22 against the upper surface of the receiving piece 20 via the washer 21. In addition, in this state, the center of the lead tube 51 and the center of the tapered projection 39 are aligned or substantially aligned.

The lower holding member 6 and the upper holding member 12
On the right side of the, a step drop portion 24 is formed so as not to hinder the expansion of the lead tube 51, and the space surrounded by these paragraphs 24 is a lead tube expansion space 27.

The upper holding member 12 has a handle bar 2
5 are provided. By gripping the handle bar 25, the expansion device 1 and thus the lead tube 51 can be fixed so as not to move.

Semicircular arc-shaped grooves 26 are formed on the peripheral surfaces of the lead tube fitting portion 7 and the lead tube fitting portion 13 at predetermined intervals in the left-right direction.

A tool engagement square hole 32 is formed at the left end of the male screw member 31. By fitting a projection of a known tool into the tool engagement square hole 32, the male screw member 31 can be rotated. . Further, as shown in FIG. 3, a fitting portion 33 having an annular groove 34 is continuously provided on the left side of the male screw member 31, and a lead pipe expanding member 36 is fitted into the fitting portion 33.
At least two pins 37 that fit into the annular groove 34 are fixed to the lead tube expanding member 36. With such a configuration, the lead tube expanding member 36 is rotatable with respect to the male screw member 31.

The lead tube expanding member 36 is a disk-shaped main body 38.
And a tapered projection 39 projecting from the center of the left end of the disk-shaped main body 38, and an annular projection wall 41 forming an annular groove 40 between the tapered projection 39 and the base of the tapered projection 39. The taper protrusion 39 is sized to push the taper protrusion 39 into the lead pipe 51 and expand the end portion of the lead pipe 51 into a predetermined taper state when the end surface of the lead pipe 51 hits the bottom of the annular groove 40. .

[0014]

[Example of use of expanding device 1] Next, a method of using the expanding device 1 and a method of connecting the lead tube 51 and the joint 53 will be described.

[First Step] The cap nut 61 is fitted into the lead pipe 51 from the side of the inner protruding flange 62. [Second Step] After that, a ring body 64 having an inner peripheral surface that is a tapered peripheral surface 65 is fitted into the lead tube 51 from the side having a smaller inner diameter. [Third Step] After that, the end portion of the lead tube 51 is expanded in a tapered shape in the following manner so that the end edge side expands. That is,
With the end portion of the lead tube 51 located in the paragraph 24, the lower holding member 6 and the upper holding member 12 allow the lead tube 51 to be positioned.
After holding, the upper holding member 1 is locked by the locking device 16.
2 is locked to the lower holding member 6, and the lead pipe 51 is sandwiched and fixed by the lower holding member 6 and the upper holding member 12.
After that, the male screw member 31 is rotated by screwing, the tapered projection 39 of the lead pipe expanding member 36 is fitted into the end portion of the lead pipe 51, and when the end of the lead pipe 51 hits the bottom portion of the annular groove 40, the male screw member 31 rotates. To stop. By this work, the lead pipe 5
The end of 1 is widened. Then, the male screw member 31 is screwed back and the tapered protrusion 39 is pulled out from the lead tube 51. Then, the upper holding member 12 is opened, and the expansion device 1 is removed from the lead tube 51. [Fourth Step] After that, the end of the expanded lead tube 51 is fitted on the tapered end 54 of the joint 53 having the annular packing 56 fitted in the annular groove 55. [Fifth Step] After that, the cap nut 61 is screwed into the male screw portion of the joint 53. By this work, the cap nut 61
Thus, the end portion of the lead tube 51 can be brought into watertight contact with the annular packing 56 via the ring body 64. The lead tube 51
A vinyl pipe 58 is connected to the other end of the.

[0016]

Advantages of the Embodiment The above embodiment has the following advantages. (1) When the end of the lead pipe 51 hits the bottom of the annular groove 40, the rotation of the male screw member 31 is stopped, so that the end of the lead pipe 51 can be easily opened in a predetermined state. . (2) Since the handle bar 25 is provided, the expansion device 1 can be easily fixed. (3) Grooves 26 are formed on the peripheral surfaces of the lead tube fitting portion 7 and the lead tube fitting portion 13.
Since the lead tube 51 is formed, the lead tube 51 can be reliably held.

[0017]

[Modifications, etc.] Modifications will be described below. (1) The locking device 16 is not limited to the one shown in the figure, and in short, the lower holding member 6 and the upper holding member 12
Anything that connects and can be used. (2) The joint 53 may have a valve. (3) The structure of the joint 53 on the right side of the male screw portion 57 is arbitrary.

[0018]

The present invention has the following effects due to the above-described structure. According to the invention of claim 1, the lead pipe and the joint can be connected reliably and easily without water leakage without a special technique of soldering. According to the invention of claim 2, the end portion of the lead pipe can be easily expanded into a tapered shape without impacting or hitting the lead pipe.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the invention of claim 2;

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a vertical cross-sectional view showing a connected state of a lead pipe and a joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Expansion device 3 Screw cylinder member 4 Screw hole 6 Lower holding member 7 Lead pipe fitting part 9 Hinge mechanism 10 Axis 12 Upper holding member 13 Lead pipe fitting part 16 Lock device 27 Lead pipe expanding space 31 Male screw member 36 Lead pipe expanding member 39 Taper protrusion 51 Lead tube 53 Joint 54 Tapered end 56 Annular packing 57 Male screw portion 61 Cap nut 62 Inner overhanging flange 64 Ring body 65 Tapered peripheral surface

Claims (2)

[Claims] 1. A step of fitting a cap nut to a lead tube from its inner side protruding flange side, a step of fitting a ring body having an inner peripheral surface with a tapered peripheral surface to a lead tube from a side having a small inner diameter, and an end portion of the lead tube being an end. A step of expanding in a taper shape so that the edge side expands, a step of fitting the expanded lead pipe end part to a tapered end part of the joint where the annular packing is fitted, and a male nut part of the fitting A method of connecting a lead pipe and a joint, the method including: 2. A screw cylinder member having a screw hole whose axial center is directed in the left-right direction, a lower holding member having a lead tube fitting portion, which is connected to a lower left portion of the screw cylinder member, and the lower holding member. An upper holding member provided on the member so as to be vertically swingable and openable by a pivot having an axis centered in the left-right direction, a locking device for locking the upper holding member to the lower holding member, and a male screw screwed into the screw hole. And a lead pipe expanding member having a tapered projection tapering toward the left side, which is rotatably provided at the left end of this male screw member, and has a screw cylinder member and lower and upper holding members. A device for expanding the end of a lead tube in which a space for expanding the lead tube is formed.