Connection work tool for pipe joint and pipe, and connection method

Abstract

To provide a manual connection work tool that can omit pipe tip diameter expansion processing (using another work tool) that has been necessary before performing connection work for pipes.SOLUTION: A tip part to be connected of a pipe P is initially left straight without any flaring, and has a pipe gripping part 7 that presses against a pipe connection cylinder part 35 of a pipe joint Z. This pressing forms a tip diameter expansion pipe part 19 at a pipe tip end, using an R-convex shaped outer surface 38 for pipe induction guide.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a tool and a method for connecting a pipe joint and a pipe. [Background technology]

[0002] Conventionally, in Patent Document 1, as shown in FIG. 25, a diameter expanding tool (not shown) is used to expand the end of a connected pipe 60 to a predetermined length L. 61 It was necessary to form the enlarged diameter pipe portion 61. Furthermore, in Patent Documents 2 and 3, similarly, before connecting the pipe fitting to the pipe, it was necessary to form an enlarged pipe section of a predetermined length at the tip of the pipe to be connected using an enlargement tool. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6976017 [Patent Document 2] Patent No. 6924538 [Patent Document 3] Patent No. 6924539 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, the work of forming the diameter-enlarged pipe section 61 with a work tool beforehand, as shown in Fig. 25, prior to the connection work, was a time-consuming and troublesome work. In particular, in a narrow piping work site where many piping pipes and various devices (equipment) exist, the work of forming the diameter-enlarged pipe section 61 was a problem of being troublesome and time-consuming.

[0005] Therefore, the pipe fitting and pipe connection tool and connection method of the present invention aim to perform piping connection work smoothly and efficiently by eliminating the (conventional) enlarged pipe section formation work that was required before the connection work. [Means for solving the problem]

[0006] The pipe fitting and pipe connecting work tool of the present invention is provided with a pipe gripping part which grips and manually presses a connected pipe in a straight tip state without any tip expansion section such as flaring or diameter expansion, thereby forming a tip expansion tube section while expanding the diameter of the straight tip section with the pipe gripping part's curved pipe guiding and guiding outer surface, and applies a first stage manual pressing force to the pipe to fit the tip expansion tube section against the outer peripheral surface of the pipe connecting part; and further, in order to fit a closed annular ring onto the outer peripheral surface of the tip expansion tube section and reduce its diameter in the radial inward direction, a second stage manual pressing force in the axial direction is applied to the closed annular ring via the pipe gripping part.

[0007] In addition, the connecting work tool of the present invention comprises a base member and a manual arm pivotally attached to the base member so as to be able to swing open and closed about a single axis; a fixed holding portion is provided on the base member in the mutual space between the base member and the manual arm and in a position near the single axis, and vertically extends from the base member for holding a cap nut with an incore inserted therein; a linear guide mechanism is further provided in the mutual space and in a position near the single axis, and vertically extends from the base member; a pipe gripping and moving block having a pipe gripping portion for gripping and pressing a connected pipe against the incore held by the fixed holding portion is attached to the linear guide mechanism so that the pipe gripping and moving block is always able to move back and forth vertically relative to the base member; and the manual arm and the pipe gripping and moving block are connected via an interlocking link.

[0008] In addition, in the pipe fitting and pipe connecting work tool of the present invention, the fixed holding part which holds the cap nut and inner core vertically has a guide pin protruding upward; when the vertical connected pipe gripped by the pipe gripping part moves downward, the guide pin is inserted from the straight tip portion at the lower end of the pipe, so as to align the axis of the straight tip portion with the axis of the inner core.

[0009] In addition, the method of connecting a pipe fitting and a pipe according to the present invention comprises forming a pipe connection tubular portion on the pipe fitting so as to protrude in the axial direction, and forming a convex-shaped pipe guiding outer surface that reduces in diameter towards the tip on the outer peripheral surface of the tip side of the pipe connection tubular portion; omitting the tip enlarged portion formed by flaring or enlarging the diameter of the connected tip of the pipe, the connected tip of the pipe is left in a straight tip state and is pressed against the pipe connection tubular portion of the pipe fitting by hand, so that the straight tip is enlarged in diameter by the convex-shaped pipe guiding outer surface to form a tip enlarged diameter tubular portion; and fitting the tip enlarged diameter tubular portion onto the outer peripheral surface of the pipe connection tubular portion.

[0010] The above-mentioned outer guiding surface having a convex radius is a method in which the longitudinal cross-sectional shape has a constant radius from the tip to the base end or the vicinity of the base end. In addition, the above-mentioned outer guidance and guiding surface, which is convex in radius, has a longitudinal cross-sectional shape that changes from a small radius to a large radius from the tip to the base end or near the base end, and the change is set to be either stepwise or continuous. In addition, a ring crimping process is added in which, after the tip enlarged tube portion is externally fitted onto the outer peripheral surface of the pipe connection tube portion, a closed annular ring is manually press-fitted onto the outer peripheral surface of the tip enlarged tube portion. Effect of the Invention

[0011] According to the connection work tool of the present invention, the work of forming an enlarged pipe as a pre-process of the pipe connection work can be completely omitted. This allows the entire pipe connection work to be performed efficiently. Furthermore, the pipe gripping part can apply a first stage pressing force to the pipe, and immediately thereafter, a second stage pressing force for fitting the closed annular ring onto the pipe can be applied, allowing the pipe connection work to be performed efficiently, quickly, smoothly, and efficiently. Furthermore, since no power source such as an electric source, hydraulic pressure, or pneumatic pressure is required and the pipe connection work can be performed manually, it can be said that this work tool is useful in the event of a disaster such as an earthquake or tsunami. Furthermore, according to the method of connecting a pipe fitting and a pipe of the present invention, the work of forming an enlarged pipe (using a separate jig) as a preliminary step to the piping connection work (see Figure 25) can be omitted, and the pipe with its straight tip portion can be pressed manually, making it possible to perform the piping connection work easily and quickly. [Brief description of the drawings]

[0012] [Figure 1] 1 is a cross-sectional explanatory view showing an embodiment of a pipe joint and pipe connecting tool and a connecting method according to the present invention, illustrating a state in which a pipe is gripped. FIG. [Diagram 2] 13 is a cross-sectional explanatory view showing a process of gripping and pressing a pipe to form an enlarged distal end tube portion and fit the enlarged distal end tube portion onto the outer circumferential surface of a pipe connection tube portion. FIG. [Diagram 3] 13 is a cross-sectional explanatory view showing a process of compressing and deforming the tip enlarged diameter tube portion in the radially inward direction by fitting a closed annular ring onto the outside while pressing it in the axial direction. FIG. [Figure 4] FIG. 4 is a cross-sectional view showing a completed state of connection between the pipe and the pipe joint. [Diagram 5] FIG. 2 is a side view showing an embodiment of a pipe joint and pipe connecting tool according to the present invention, in a state corresponding to FIG. 1. [Figure 6] FIG. 6 is a plan view of FIG. 5. [Figure 7] FIG. 4 is a side view of a state corresponding to FIG. 3. [Figure 8] FIG. 5 is a side view corresponding to FIG. 4 and showing a connection completed state. [Figure 9]FIG. 4 is a plan view of the connecting power tool, showing an open state before the pipes are set. [Figure 10] 13A and 13B are diagrams showing the state immediately before the pipe is set and gripped, in which (A) is a plan view of the connecting work tool, and (B) is a cross-sectional view taken along the line (bb) of (A). [Figure 11] 3A and 3B correspond to Figs. 1 and 2 and show the state in which a pipe is being gripped and pushed in, in which (A) is a plan view of the connecting work tool and (B) is a cross-sectional view taken along the line (bb) of (A). [Figure 12] 13A and 13B are diagrams showing the state just before the grip on the pipe is released and the closed annular ring is pushed in, in which (A) is a plan view of the connecting work tool, and (B) is a cross-sectional view taken along the line (bb) of (A). [Figure 13] 13A and 13B are diagrams showing the state in which a closed annular ring is being pushed in, in which (A) is a plan view of the connecting work tool, and (B) is a cross-sectional view taken along the line (bb) of (A). [Figure 14] FIG. [Figure 15] FIG. 13 is a plan view showing the state in which the pipe is being removed in an open state. [Figure 16] 10 is a cross-sectional explanatory view showing a state in which the straight tip portion of the connection pipe abuts against the tip of the pipe connection cylindrical portion; FIG. [Figure 17] FIG. 17 is an explanatory cross-sectional view showing the state after FIG. 16, in which the tip end portion of the pipe starts to expand in diameter. [Figure 18] FIG. 18 is an explanatory cross-sectional view showing the state after FIG. 17, in which the tip of the pipe rides on the outer surface for guiding the pipe. [Figure 19] 19 is a cross-sectional explanatory view showing the state after FIG. 18, in which the end enlarged diameter tube portion of the pipe is fitted onto the pipe connection tube portion. FIG. [Figure 20] FIG. 4 is an enlarged cross-sectional view showing an example of an outer surface for guidance. [Figure 21] FIG. 11 is an enlarged cross-sectional view of another example of an outer guiding surface. [Figure 22] FIG. 11 is an enlarged cross-sectional view of another example of an outer guiding surface. [Figure 23] FIG. 11 is an enlarged cross-sectional view of yet another example of an outer guiding surface. [Figure 24] FIG. 2 is an explanatory cross-sectional view showing a modified example instead of FIG. [Diagram 25] FIG. 13 is a cross-sectional explanatory view showing a conventional example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The present invention will be described in detail below based on the illustrated embodiments. FIG. 4 shows the completed state of connection between the pipe P and the pipe fitting Z, and FIGS. 1, 2, and 3 are cross-sectional views for sequentially explaining each step of connecting the pipe fitting Z and the pipe P using the connecting work tool according to the present invention. The material of the pipe P is metal such as copper, aluminum, stainless steel, etc., or hard synthetic resin such as polyethylene, etc. Moreover, it is preferable to use a structure in which two or more different types of materials are laminated.

[0014] In Fig. 4, 1 is a joint body and 2 is a cap nut. The joint body 1 is what is called a "flare joint body" and has a male thread portion 1A and a tip reduced diameter tapered portion 1B, and for example, one specified in JIS B 8607 can be used. The female thread portion 2A of the cap nut 2 is screwed into the male thread portion 1A of the flare joint body 1. As this cap nut 2, one specified in JIS B 8607 can be used. In the hole 16 of this cap nut 2, a large diameter female thread portion 2A, a large diameter relief portion 2B, a tapered portion 2C, and a tip small diameter portion 2F are formed in this order from the base end to the tip.

[0015] As shown in Figure 4 and Figures 1 to 3, an in-core 30 is attached in an internally fitted manner, having a flare forming portion 31 that is clamped (pressed) between the tapered portion 2C of the cap nut 2 and the tip reduced diameter tapered portion 1B of the flare fitting body 1, and integrally having a pipe connection tube portion 35 connected to the small diameter side end edge 32 of this flare forming portion 31. The pipe connection cylinder part 35 of this in-core 30 is connected to the small-diameter side edge 32 of the flare forming part 31 (as described above), penetrates through the hole part of the socket nut 2 - - - the tip small-diameter part 2F - - - and extends outward from the socket nut 2. In this way, the tip part 5 of the straight pipe P (see Fig. 1) is pressed against the pipe connection cylinder part 35 of the in-core 30 that extends (projects) from the outer end face 2E of the socket nut 2. (As will be described later.)

[0016] Here, regarding the connection method of fitting and fixing the straight tip part 5 onto the pipe connection cylinder part 35 protruding from the socket nut 2 as shown in Fig. 4 (showing the final connection state), it will be described below. As shown in Fig. 1, a pipe connection cylinder part 35 is formed to project in the axial direction on the pipe joint Z. An arcuate convex outer surface 38 for pipe guiding and guiding that tapers in diameter toward the tip direction is formed on the outer peripheral surface of the tip side of this pipe connection cylinder part 35.

[0017] In the embodiment shown in Fig. 20, the arcuate convex outer surface 38 for pipe guiding and guiding has its longitudinal cross-sectional shape set to a constant radius R0 from the tip 38A to the base end 38B and to the vicinity of the base end 38C. In Fig. 20, H indicates the range near the base end. If the total axial length of the outer surface 38 for pipe guiding and guiding is H0, it is defined as the range of the following formula 1. 0 < H ≦ 0.3·H0 ··· Formula 1 Alternatively, as shown in Fig. 21, the arcuate convex outer surface 38 for pipe guiding and guiding has its longitudinal cross-sectional shape changing from a small value to a large value of the radius R from the tip 38A to the base end 38B or the vicinity of the base end 38C as R1 → R2 → R3 → R4 in Fig. 21. It should be noted that for the change of R1 → R2 → R3 → R4 shown in Fig. 21, either the case of changing stepwise or the case of setting it to change continuously and steplessly can be freely selected.

[0018] Also, even in the embodiment of Fig. 21, the following formula 2 holds between the range near the base end indicated by H in the figure and the total axial length H0 of the outer surface 38 for pipe guiding and guiding. (That is, it is the same as the above formula 1.) 0 < H ≤ 0.3·H0 ··· Equation 2 Furthermore, as shown in FIGS. 20 and 21, in the range from the vicinity of the base end 38C to the base end 38B, a straight region 13 with an infinite radius R is provided.

[0019] Next, as shown in FIG. 1, with the tip of the pipe P approaching the tip 38A of the outer surface 38 for pipe guiding and guiding, in a state where the axial centers Lp and L of both are made to coincide, as shown in FIG. 22 or FIG. 23, it is also desirable to integrally form an annular small protrusion 15 for preventing core runout at the tip 38A of the outer surface 38 for pipe guiding and guiding. 35 However, in the embodiments shown in FIGS. 1 to 3, a guide pin 42 (as a jig) projects upward from the fixed holding portion 17 so that the annular small protrusion 15 can be omitted.

[0020] The tip 42P of the guide pin 42 (with a small diameter) protruding upward from this fixed holding portion 17 is hemispherical or conical or frustoconical, and when the pipe P to be connected descends in a vertical posture, it exhibits a function of surely correcting to a concentric state. As is clear from FIG. 1, the axial center of the straight tip portion 5 of the pipe P and the axial center of the pipe connection cylinder portion 35 are completely coincident by inserting the guide pin 42 into both 5 and 35, so the annular small protrusion 15 shown in FIGS. 22 and 23 can be omitted. (That is, it can be said that a shape like that in FIGS. 20 and 21 is sufficient.)

[0021] Also, as shown in FIGS. 1 to 3, a short cylindrical boss portion 43 (with the male thread omitted) is fitted in an inserted state to the female thread portion 2A on the inner peripheral surface of the cap nut 2. More specifically, a boss portion 43 is integrally connected to the lower end of the guide pin 42 via a tapered surface portion 44. Moreover, the outer peripheral surface of the short cylindrical boss portion 43 is in a fitting state with respect to the inner peripheral surface of the female thread portion 2A of the cap nut 2 with a minute gap therebetween. If a male thread were formed in boss portion 43 and the female thread portion 2A of the cap nut 2 were screwed into it, it would take time to screw the cap nut 2 in and out, lengthening the work time. However, with the structure shown in Figures 1 to 3 described above, it is not necessary to screw the cap nut 2 in and out, which can improve work efficiency.

[0022] Further, the protruding pipe connection tube portion 35 of the pipe joint Z is formed in advance with a rounded convex pipe guiding outer surface 38. On the other hand, the connecting pipe P does not have a tip enlarged portion such as a flare or an enlarged diameter portion (see the conventional enlarged diameter pipe portion 61 shown in FIG. 25). However, as shown in FIG. 1, it may be desirable to machine a small chamfer on the inner peripheral end of the tip portion Pf of the pipe P. In this manner, the tip enlargement portion such as flaring or enlarging is omitted from the tip portion Pf of the connection pipe P, and the pipe P is pressed in the direction of the arrow Fp as shown in Figures 16 to 19 and as shown in Figures 1 and 2 with the straight tip portion 5 remaining as it is.

[0023] Incidentally, in the present invention, the pipe P is pressed in the direction of the arrow Fp by human power (without using an actuator such as an electric, hydraulic or pneumatic actuator) (as will be described later in detail).

[0024] The pipe guiding outer surface 38 has a convex radius that narrows toward the tip (as already explained in Figures 20 and 21, etc.), so that the tip of the pipe P smoothly undergoes an expanding deformation and rides up along the pipe guiding outer surface 38, as shown by arrow N1 in Figure 17.

[0025] 18 and 19, the tip of the pipe P rides up onto (is tightly fitted onto) the pipe connection tube portion 35 (in the direction of arrows N2 and N3). In other words, by applying a pressing force in the direction of the arrow Fp (axial direction) to the straight tip portion 5 without flaring or enlarging the tip portion Pf of the pipe P, the straight tip portion 5 is deformed in diameter by the rounded pipe guiding outer surface 38, forming the tip enlarged diameter pipe portion 19, as shown in Fig. 16, 17, 18, and 19. This tip enlarged diameter pipe portion 19 comes into close contact with the pipe connecting tube portion 35. Although Figures 16 to 19 show the pipe P moving in a horizontal direction, it is preferable to move the pipe P in a vertical direction from top to bottom, as shown in Figures 1 to 3 and 5 to 8.

[0026] Next, referring to Figs. 1 to 3, a step of crimping a closed annular ring 20 is added. That is, as shown in Figures 1 and 2, a manual pressing force Fp is applied to the pipe P with its straight tip portion 5, thereby expanding and deforming it to form the tip enlarged tubular portion 19, and then, as shown in Figures 2 and 3, a ring crimping process is performed in which a closed annular ring 20 is manually press-fitted onto the outer circumferential surface of the tip enlarged tubular portion 19. The pipe connection tube portion 35 has small protrusions 8 formed on its outer circumferential surface, the protrusions having a triangular cross section for fluid tightness and for preventing withdrawal.

[0027] FIG. 4 shows a connection structure manufactured by the method for connecting a pipe and a pipe described with reference to FIGS.

[0028] Next, FIG. 24 shows another embodiment which replaces the above-mentioned FIG. 1 to FIG. 1 to 4 are omitted, and the in-core 30 (see Figs. 1 to 4) is integrated with the joint body 1. That is, in Fig. 24, the joint body 1 itself has integral pipe connection tubular portions 35, 35 protruding in both axial directions. On the outer peripheral surface on the tip side of each pipe connection cylindrical portion 35, a pipe guiding outer surface 38 having a rounded convex shape whose diameter decreases toward the tip (similar to Figs. 1 to 4) is formed.

[0029] In the embodiment shown in FIG. 24, the pipe guiding outer surfaces 38, 38 are provided (symmetrically) on both axial ends, but the other end may be freely provided with a tapered threaded portion (not shown) to form a male socket shape for screwing into a threaded hole of a valve body, other fitting, etc.

[0030] Next, the structure and operation of the pipe joint and pipe connecting tool according to the present invention will be described below. As shown in FIGS. 5 to 8, the device has a base member 6 and a manual arm 10, both of which are pivotally connected to a horizontal pivot shaft 45.

[0031] The base member 6 is in the shape of a rod (arm) or a strip, etc., and is placed on a fixed mounting surface such as a workbench. The manual arm 10 is connected to the axis of the pivot shaft 45 (which is called the single axis L 45 The door is pivotally mounted on a base member 6 so as to be able to swing open and close freely around a hinged door (referred to as the hinged door 10). In other words, the tip 11 of the manual arm 10 and the tip 8 of the base member 6 are pivotally connected by a pivot shaft 45, and are arranged along a horizontal axis L 45 The manual arm 10 is capable of swinging freely around the shaft 11 (see arrows M1 and M2 in FIG. 5).

[0032] The mutual space 12 between the base member 6 and the manual arm 10 and the single axis L 45 A fixed holding portion 17 for holding the cap nut 2 perpendicularly from the base member 6 is provided on the base member 6 in a position adjacent thereto. The fixed holding portion 17 is a boss portion 43 (of a guide pin 42) that is inserted into the cap nut 2 from below. Although not shown, it is also preferable to attach a manual simple clamp part that can be opened and closed freely to the base member 6 as the holding part 17 that detachably fixes the pipe joint Z.

[0033] In the embodiment shown in Figures 5 to 8, the manual arm 10 has a bent short piece 10A bent at an approximately right angle on the tip 11 side, and the pivot shaft 45 is disposed at the lower tip position of this bent short piece 10A. In addition, the mutual space 12 between the base member 6 and the manual arm 10 maintains a substantially constant mutual distance in side view even in the most closed state as shown in FIG. 7 (due to the formation of the above-mentioned folded short piece portion 10A), and in particular, the tip region 12T of the mutual space 12 forms an elongated rectangle.

[0034] A linear guide mechanism 18 is provided perpendicularly from the base member 6 in the tip region 12T of this elongated rectangle and in the vicinity of the axis L7. The linear guide mechanism 18 is made up of a vertical rail 18A and a slider 18B. The rail 18A is fixed to a fixed mounting plate 21 that protrudes upward from the base member 6. 25 is a pipe gripping moving block.

[0035] The pipe gripping and moving block 25 is provided with a pipe gripping portion 24 for gripping (vertically) the connected pipe P to the pipe fitting Z held by the fixed holding portion 17 and pressing it vertically downward. This pipe gripping and moving block 25 is attached to the linear guide mechanism 18, and the pipe gripping block 25 is always freely movable back and forth in the vertical direction relative to the base member 6.

[0036] As shown in Figures 5, 7 and 8, the manual arm 10 is provided with a protrusion 39 with a hole, and this protrusion 39 is connected to the pipe gripping moving block 25 via an interlocking link 27 and pins 28, 29.

[0037] Next, FIGS. 9 to 15 will be described in relation to FIGS. 5 to 8 and FIGS. 1 to 4. FIG. 9 to 15 are partially sectional plan views of the pipe gripping moving block 25 and the fixed mounting plate 21, etc. Also, in Figs. 10 to 13, (B) in each figure is an enlarged explanatory view of the (bb) section of (A) in each figure. The fixed mounting plate 21 (see Figure 5) standing on the base member 6 is composed of a base plate 21A to which the linear guide mechanism 18 is attached and a control plate 21B arranged parallel to the base plate 21A, and is arranged approximately parallel to each other with a predetermined distance between them.

[0038] A linear guide mechanism 18 is provided along the leading edge of the base plate 21A in plan view. Also, the leading edge of the control plate 21B is bent in a direction approaching the base plate 21A in plan view to form an inclined surface 22 and a retreating relief surface 23. The inclined surface 22 and the retreating clearance surface 23 are portions that perform a simple cam (control) function.

[0039] Here, we will explain the pipe gripping and moving block 25. This block 25 is equipped with a gripping body 25A on which the slider 18B of the linear guide mechanism 18 is provided and which is movable in the vertical direction, and a lid body 25B pivotally attached by a pin 25C so as to be swingable openable and closable. A follower 34, which comes into elastic contact with the inclined surface 22 and the relief surface 23 of the control plate 21B by the elastic force of a spring 33, is provided at the tip of the cover 25B so as to protrude from the tip of the cover 25B. The cross section of the follower 34 is shown as being rectangular, but it is also preferable to make it elliptical or circular. In addition, a manual knob 36 is attached to the driven body 34.

[0040] Fig. 9 shows a state in which the pipe gripping portion 24 is opened. Thereafter, the pipe P is installed as shown in Fig. 10, and then, while the pipe P is being gripped as shown in Fig. 11, the pipe P is pushed into the pipe connection tube portion 35 (in the direction of the arrow V1 as shown in Figs. 1 and 2).

[0041] Next, the cover 25B is slightly opened as shown in Figures 12 and 13. The state of Figures 12 and 13 corresponds to Figure 3, and the closed annular ring 20 is pressed in the direction of the arrow V2. In this way, the connection is completed as shown in FIG. 4, so that the lid body 25B can be opened as shown in FIGS. 14 and 15, and the connected cap nut 2 and pipe P can be removed.

[0042] 24 shows a modified example of the pipe joint Z, which is an integral part of the pipe connection tube 35. The fixed holding part 17 is in the shape of the arrow N. 17 It is equipped with a part that can be operated in the direction of (and the opposite direction) to (detachably) clamp the pipe fitting Z.

[0043] As described above, the pipe fitting and pipe connection tool according to the present invention is a tool for connecting a pipe to a pipe, which is provided with a pipe connecting tubular portion 35 of a pipe fitting Z, which has a pipe connecting tubular portion 35 having a convex-shaped pipe guiding and guiding outer surface 38 that is radiused toward the tip and protrudes in the axial direction; the pipe P to be connected, which has a straight tip portion 5 without a tip enlargement portion such as a flared portion or a diameter enlargement portion, is held and pressed manually, so that the straight tip portion 5 is enlarged by the convex-shaped pipe guiding and guiding outer surface 38. The pipe gripping portion 7 applies a first-stage manual pushing force V1 to the pipe P to form the tip enlarged tube portion 19 while deforming the pipe P in diameter, and to fit the tip enlarged tube portion 19 against the outer circumferential surface of the pipe connection tube portion 35; and a second-stage manual pushing force V2 in the axial direction is applied to the closed annular ring 20 via the pipe gripping portion 7 to fit a closed annular ring 20 against the outer circumferential surface of the tip enlarged tube portion 19 and deform it in the radially inward direction by reducing the diameter.

[0044] In addition, the method of connecting a pipe fitting and a pipe according to the present invention involves forming a pipe connection tubular portion 35 on the pipe fitting Z so as to protrude in the axial direction, and forming a rounded pipe guiding outer surface 38 that narrows in diameter toward the tip on the outer peripheral surface of the tip side of the pipe connection tubular portion 35; omitting the tip enlarged portion formed by flaring or enlarging the diameter of the connected tip portion Pf of the pipe P, the straight tip portion 5 is left as it is, and is pressed against the pipe connection tubular portion 35 of the pipe fitting Z by hand, so that the rounded pipe guiding outer surface 38 enlarges and deforms the straight tip portion 5 to form a tip enlarged diameter tube portion 19; and fitting the tip enlarged diameter tube portion 19 onto the outer peripheral surface of the pipe connection tubular portion 35.

[0045] In addition, the method of connecting a pipe fitting and a pipe of the present invention adds a ring crimping process in which, after the tip enlarged tube portion 19 is externally fitted onto the outer peripheral surface of the pipe connection tube portion 35, a closed annular ring 20 is manually press-fitted onto the outer peripheral surface of the tip enlarged tube portion 19.

[0046] The connecting tool according to the present invention is not limited to the illustrated embodiment, and various design modifications are possible. For example, the base member 6 in Fig. 5 to Fig. 8 may be configured to be operated by being held by a human hand, like the manual arm 10, so that it can be opened and closed with both hands. In this case, it is not limited to holding the pipe P vertically, and it is also preferable to hold the pipe P horizontally during the operation.

[0047] As described above in detail, the pipe fitting and pipe connection tool of the present invention is a tool for connecting a pipe to a pipe, which is provided with a pipe connecting tubular portion 35 of a pipe fitting Z, which has a rounded pipe guiding outer surface 38 that is tapered toward the tip and protrudes in the axial direction; the tool grips and manually presses a connected pipe P having a straight tip portion 5 without any tip enlargement processing such as flaring or diameter enlargement, thereby forming a tip enlarged diameter tube portion 19 while enlarging and deforming the straight tip portion 5 with the rounded pipe guiding outer surface 38, and the pipe connecting tubular portion 35 is deformed in diameter by the rounded pipe guiding outer surface 38. The pipe gripping section 7 applies a first-stage manual pressure V1 to the pipe P to fit the tip enlarged tube section 19 to the outer circumferential surface; and a second-stage manual pressure V2 in the axial direction is applied to the closed annular ring 20 via the pipe gripping section 7 to fit the closed annular ring 20 to the outer circumferential surface of the tip enlarged tube section 19 and deform it in the radially inward direction. This allows the straight tip section 5 to be smoothly fitted to the pipe connection tube section 35 of the pipe joint Z while being deformed in the radially inward direction by the first-stage manual pressure V1. Moreover, it is possible to smoothly and quickly switch to a state in which the second-stage manual pressure V2 is applied. In this way, the first-stage manual pressure V1 and the second-stage manual pressure V2 can be applied to the pipe P and the closed annular ring 20 in sequence almost continuously, so that the efficiency of the connection work between the pipe joint Z and the pipe P is extremely excellent. Moreover, as shown in Fig. 25, it is possible to omit the troublesome and time-consuming preliminary processing of forming the diameter-enlarged tube portion 61 at the tip of the pipe 60 in advance using a separate tool. Moreover, the tool itself is easy to carry, compact, and easy to handle, and does not require skill. In addition, the tool can be made to have a simple structure and is lightweight.

[0048] The pipe joint and pipe connection tool according to the present invention comprises a base member 6 and a uniaxial center L 45 and a manual arm 10 pivotally mounted around the base member 6 so as to be able to swing open and close; a mutual space 12 between the base member 6 and the manual arm 10, and the single axis L 45A fixed holding portion 17 for holding the cap nut 2 with the in-core 30 inserted therein is provided on the base member 6 at a position near the center line L. 45 A linear guide mechanism 18 is provided vertically from the base member 6 at a position near the base member 6; a pipe gripping moving block 25 having a pipe gripping portion 24 for gripping and pressing the connected pipe P against the in-core 30 held by the fixed holding portion 17 is attached to the linear guide mechanism 18, so that the pipe gripping moving block 25 can always move back and forth vertically relative to the base member 6; and since the manual arm 10 and the pipe gripping moving block 25 are connected via an interlocking link 27, when the manual arm 10 is lightly pressed (swinged) by hand, the pipe gripping moving block 25 can be strongly moved and pressed (by the principle of leverage) against the fixed holding portion 17 via the interlocking link 27. With this moving and pressing force, the straight tip portion 5 of the pipe P can be easily and reliably fitted onto the connecting tube portion 35 of the pipe joint Z while being expanded and deformed (as shown in Figs. 1 and 2). Moreover, the linear guide mechanism 18 allows the axis of the straight tip portion 5 of the pipe P to coincide with the axis of the connecting tubular portion 35 of the pipe joint Z with high precision. This allows the connection, which involves the diameter expansion deformation from Fig. 1 to Fig. 2, to be performed reliably and smoothly.

[0049] In addition, in the pipe fitting and pipe connection work tool of the present invention, the fixed holding part 17 which holds the cap nut 2 and the incore 30 vertically has a guide pin 42 protruding upward; when the vertical connected pipe P gripped by the pipe gripping part 24 moves downward, the guide pin 42 is inserted from the straight tip 5 at the lower end of the pipe P so as to align the axis L5 of the straight tip 5 with the axis of the incore 30, so that the straight tip 5 of the pipe P is fitted onto the incore 30 reliably and smoothly.

[0050] In addition, the method of connecting a pipe joint and a pipe according to the present invention forms a pipe connection tubular portion 35 in the pipe joint Z so as to protrude in the axial direction, and forms a pipe guiding outer surface 38 having a convex radius and tapering in the tip direction on the outer peripheral surface of the tip side of the pipe connection tubular portion 35; the connected tip portion Pf of the pipe P is not flared or enlarged, and is pressed against the pipe connection tubular portion 35 of the pipe joint Z in its straight tip portion 5 state by hand, so that the straight tip portion 5 is enlarged in diameter by the convex radius of the pipe guiding outer surface 38, forming a tip enlarged diameter tube portion 19; and the tip enlarged diameter tube portion 19 is fitted onto the outer peripheral surface of the pipe connection tubular portion 35, which completely eliminates the need for troublesome and time-consuming preliminary processing, such as forming an enlarged diameter tube portion 61 (see FIG. 25) at the tip of the pipe P using a work tool before the work. In particular, the above preliminary processing (work) in a small work site where many piping pipes and various devices and equipment are present is troublesome and time-consuming, but the present invention makes it possible to omit such preliminary processing, and significantly improves the work efficiency of the entire piping connection work. Moreover, since it is operated by "manual power", there are the following advantages. That is, the axis Lp of the pipe P and the axis L of the pipe connection tube portion 35 are 35 If the two shaft centers Lp and Lp are eccentric (not in a straight line) or cross less than 180°, it is possible to detect this with the human hand. 35 This allows the parts to be re-set in a straight line, preventing damage to the parts and preventing connection failures.

[0051] In addition, the longitudinal cross-sectional shape of the above-mentioned convex-shaped guidance guiding outer surface 38 has a constant radius R0 from the tip 38A to the base end 38B or the vicinity of the base end 38C, so that it has a simple cross-sectional shape as exemplified in Fig. 20, and can be smoothly and tightly fitted from the tip to the base end of the pipe connection tube part 35 as shown in Fig. 16 to Fig. 19 in sequence. In particular, the pipe connection tube part 35 and the inner surface of the pipe P are always in a stable and tight pressure contact state, which reliably prevents the fluid from leaking out.

[0052] Furthermore, the cross-sectional shape of the curved guidance outer surface 38 is such that the radius R changes from a small value to a large value from the tip 38A to the base end 38B or near the base end 38C, and the change is set to be either stepwise or continuous, resulting in a bullet-like shape as shown in Figure 21, which allows the pipe P to be tightly guided and fitted around the pipe P while undergoing an expansion and deformation more smoothly than in Figures 16 to 19.

[0053] In addition, a ring crimping process is added in which, after the tip enlarged tube portion 25 is fitted onto the outer peripheral surface of the tip enlarged tube portion 25, a closed annular ring 20 is manually press-fitted onto the outer peripheral surface of the tip enlarged tube portion 25.This means that the ring crimping process is performed smoothly and quickly (as shown in Figures 3 and 4), and the inner surface of the tip enlarged tube portion 25 of the pipe P is strongly pressed against the outer peripheral surface of the pipe connection tube portion 35 by the force of the ring 20 in the diameter reduction direction, thereby both ensuring a tight seal and preventing the pipe from being pulled out. [Explanation of symbols]

[0054] 5 Straight tip 6 Base material 7 Pipe gripping part 10 Manual Arm 12 Interspace 17 Fixed holding part 18 Linear guide mechanism 19 Tip enlarged tube section 20 Closed Annular Ring 24 Pipe gripping part 25 Pipe gripping and moving block 27 Related Links 35 Pipe connection tube 38 Pipe Guidance Outer Surface 38A Tip 38B Proximal end 38C Near the base 42 Guide pin 45 Pivot shaft L 45 uniaxial center P Pipe Pf tip R radius R0 constant radius V1 1st stage manual pushing force V2 2nd stage manual pushing force Z Pipe Fittings

Claims

1. A pipe joint (Z) has a pipe connection tubular portion (35) having a pipe guiding outer surface (38) with a convex radius that decreases toward the tip, and the pipe connection tubular portion (35) is provided so as to protrude in the axial direction. The connected pipe (P) in the state of a straight tip portion (5) without any tip enlargement processing such as flaring or diameter enlargement is gripped and manually pressed to form a tip enlarged diameter pipe portion (19) while enlarging the diameter of the straight tip portion (5) by the convex-arc pipe guiding outer surface (38), and a first-stage manual pressing force (V) is applied to fit the tip enlarged diameter pipe portion (19) onto the outer circumferential surface of the pipe connection tube portion (35). 1 a pipe gripping portion (7) for applying the pipe (P) to the pipe (P), Moreover, in order to fit the closed annular ring (20) onto the outer circumferential surface of the end diameter expansion pipe portion (19) and to deform the closed annular ring (20) in the radially inward direction by reducing its diameter, a second stage manual pressing force (V 2 ) is applied via the pipe gripping portion (7). A tool for connecting pipes and pipe fittings.

2. A base member (6) and a uniaxial center (L 45 and a manual arm (10) pivotally attached around the door so as to be swingable open and closed. The space (12) between the base member (6) and the manual arm (10) and the single axis (L 45 a fixed holding portion (17) for holding the cap nut (2) with the in-core (30) inserted therein, the fixed holding portion (17) being disposed vertically from the base member (6) at a position adjacent to the cap nut (2) with the in-core (30) inserted therein; Furthermore, within the mutual space (12) and along the single axis (L 45 a linear guide mechanism (18) is provided vertically from the base member (6) at a position adjacent to the base member (6); a pipe gripping and moving block (25) having a pipe gripping portion (24) for gripping and pressing a connection pipe (P) against the in-core (30) held by the fixed holding portion (17); The pipe gripping and moving block (25) is attached to the linear guide mechanism (18) so as to be always vertically movable back and forth relative to the base member (6); Moreover, the manual arm (10) and the pipe gripping moving block (25) are connected via an interlocking link (27). A tool for connecting pipes and pipe fittings.

3. The fixed holding portion (17) that holds the cap nut (2) and the core (30) vertically has a guide pin (42) that protrudes upward, When the vertical connected pipe (P) held by the pipe holding portion (24) moves downward, the guide pin (42) is inserted from the straight tip portion (5) at the lower end of the pipe (P) and the axis (L 5 3. A pipe joint and pipe connecting tool according to claim 2, wherein the axis of said inner core (30) is aligned with the axis of said inner core (30).

4. A pipe connection tubular portion (35) is formed in the pipe joint (Z) so as to protrude in the axial direction, and a pipe guiding outer surface (38) having a convex radius and tapering in the direction of the tip is formed on the outer peripheral surface of the tip side of the pipe connection tubular portion (35). The connected tip end portion (Pf) of the pipe (P) is not subjected to flaring or diameter enlargement processing, and is left as a straight tip end portion (5) by manually pressing it against the pipe connection tube portion (35) of the pipe joint (Z) to form a tip enlarged diameter pipe portion (19) while the straight tip end portion (5) is enlarged in diameter by the rounded pipe guiding outer surface (38). The enlarged diameter tip pipe portion (19) is fitted onto the outer circumferential surface of the pipe connection tube portion (35). A method for connecting a pipe to a pipe fitting, comprising:

5. The above-mentioned guide surface (38) having a convex radius has a vertical cross-sectional shape having a constant radius (R) from the tip (38A) to the base end (38B) or the vicinity of the base end (38C). 0 5. The method for connecting a pipe joint to a pipe according to claim 4, wherein

6. 5. A method for connecting a pipe fitting to a pipe as set forth in claim 4, wherein the cross-sectional shape of the convex-shaped guiding outer surface (38) has a radius (R) that changes from a small value to a large value from the tip (38A) to the base end (38B) or the vicinity of the base end (38C), and the change is set to change stepwise or continuously.

7. 5. A method for connecting a pipe fitting and a pipe as described in claim 4, further comprising the step of manually press-fitting a closed annular ring (20) onto the outer circumferential surface of the tip enlarged tube portion (19) after the tip enlarged tube portion (19) is externally fitted onto the outer circumferential surface of the pipe connection tube portion (35).

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