JPH10219716A - Ring removable device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ring removable device capable of easily removing a mooting ring for the pipe joint of a manhole in a reusable manner. SOLUTION: In the ring removable device 60, a mounting ring for a pipe joint consists of flange sections, a hoop section formed in a ring shape, a plurality of saw- tooth shaped pawl sections protruded to the terminal section on the inner circumferential side of the hoop section and the upper section of an inner circumferential surface near to the terminal section, a pawl retaining section, to which pawl sections are built in a retainable manner while being crossed over the upper sections of the pawl sections in the vicinity of the terminal section on the outer circumferential side of the hoop section, and each leg receiving section formed to each flange section of the terminal sections on the inner and outer circumferential sides. The ring removable device 60 is composed of a pair of left-right fork sections 61, a front support section 62 bridged onto the top faces of the fork sections 61, a pushing-force receiving section 63 supported to the front support section 62, and a rear support section 64 constructed onto the undersides of the fork sections 61. Accordingly, the front end sections of the fork sections 61 are pushed into the pawl retaining section 11 and expanded and deformed, and the engagement of the pawl sections 9 can be disengaged comparatively easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring removing device for removing a fitting ring for a pipe joint which gives a flexible pipe joint for connecting a manhole and a connecting pipe sufficient water-tightness.

[0002]

2. Description of the Related Art Usually, manholes scattered in a piping system for drainage or the like are damaged or damaged even when an external force such as an earthquake is applied to a mounting hole in which the upstream and downstream pipings penetrate through a concrete peripheral wall.
They are connected via flexible rubber pipe joints to prevent water leakage. 4 to 8 show a conventional method of connecting a manhole and a connecting pipe. FIG. 4 is a sectional view of a main part of the manhole and the connecting pipe in a state where connection is completed. FIG. FIG. 6 is a partially cutaway front view showing a state before attachment of the manhole joint attachment ring 6 for expanding the inner peripheral surface of the manhole joint, FIG. 6 is a plan view of a portion A in FIG. 5, and FIG.
8 is a cross-sectional view taken along the line BB of FIG. 7, and FIG.

In a conventional fitting ring 6 for a pipe joint, a part of a flexible rubber pipe joint 4 is fitted into a mounting hole 2 penetrated through a peripheral wall of a manhole 1, and furthermore, an inner periphery of the pipe joint 4 is fitted. By expanding concentrically with the pipe joint 4 along the surface, sealing between the outer peripheral surface of the pipe joint 4 and the inner surface of the mounting hole 2 has been achieved. On the other hand, the other end of the pipe joint 4 on the side opposite to the manhole has its outer peripheral surface formed by another mounting ring 5.
Thus, the connection pipe 3 inserted into the inside is tightened so as to be tight, so that the pipe connection to the manhole 1 is completed.

Further, the fitting ring 6 for a pipe joint is shown in FIG.
As can be seen from FIG. 7, the flange portion 8 is integrally formed along the circumferential edges on both sides thereof, and furthermore, the overlap region 12 is large enough to enable the both ends to be locked with the expansion. And a hoop 7 formed in an annular shape with
The inner peripheral end portion 13 and the vicinity thereof are partially removed from the flange portion 8 to facilitate the overlap with the outer peripheral end portion 14 described later, while a plurality of sawtooth-shaped portions are formed on the inner peripheral surface. The claw portion 9 was provided. The overlap area
The hoop portion 7 in 12 includes a claw locking portion 11 which can lock the claw portion 9 across the claw portion 9 in the vicinity of the outer peripheral side terminal portion 14, and further includes the inner and outer peripheral portions. Side terminals 13, 14
Each of the flange portions 8 located outside the overlap region 12 has a leg receiving portion 10a, 10b.

When the fitting ring 6 for a pipe joint is extended concentrically with the pipe joint 4 along the inner peripheral surface of the pipe joint 4, for example, a mounting ring expanding device 20 as shown in FIG.
Was used. The mounting ring extending device 20 includes a beam portion 21 and a first leg portion swingably suspended along a longitudinal direction of the beam portion 21 via a first pivot 30 and a second pivot 31, respectively.
23 and the second leg 24 extend from one end of the beam 21 toward the axis of the second pivot 31 along the longitudinal direction of the beam 21 to move the second leg 24 into a leg sliding span. The sliding screw portion 22 for sliding along the SL, the first support shaft 32 of the first leg portion 23
And an extension screw extending between the second support shaft 33 of the second leg 24 and parallel to the sliding screw portion 22 to swing and extend the second leg 24 along the leg swing span SW. And a first and a second locking claw 23a, 24a disposed at a lower end of each of the first and second legs 23, 24.

[0006] The first leg 23 is connected to the beam 21.
Since the sliding screw portion 22 does not reach a boss (not shown) integrated with the first pivot 30 so as to be swingable via the first pivot 30, If there is sufficient mechanical strength, the boss can be omitted. Further, a boss portion (not shown) of the first leg portion 23 through which the extension screw portion 25 penetrates is provided on a boss portion (not shown) provided at one end of the beam portion 21 through which the sliding screw portion 22 penetrates. Similarly to the case (not shown), the female screw is not engraved, and a retaining member is added to simply allow the sliding screw portion 22 to rotate.

On the other hand, the second leg 24 is connected to the beam 21
On the other hand, a female screw screwed to the sliding screw portion 22 is provided on a boss (not shown) which is swingably supported via the second pivot 31 and is integrated with the second pivot 31. When the sliding screw portion 22 is rotated substantially in synchronization with the extension screw portion 25, the sliding screw portion 22 penetrates the slit 34 provided in the front and rear surfaces of the beam portion 21 in a loosely fitted state. 2 Axis 31
The second leg 24 slides along the leg slide span SL through the stem. Further, the second leg 24
Since a female screw to be screwed with the expansion screw portion 25 is engraved on a boss (not shown) integrated with the second support shaft 33, the expansion screw portion 25 is connected to the sliding screw. When rotated substantially in synchronism with the portion 22, the rocking expansion is performed along the leg rocking span SW.

With respect to the pipe fitting mounting ring 6 before expansion in which the mounting ring expansion spanning EX is almost occupied by the overlap region 12, the mounting ring expansion span is provided on the terminal side of each of the leg receiving portions 10a and 10b. First and second locking claws 23
a and 24a are brought into contact with each other, and the sliding screw portion 22 and the extension screw portion 25 are set in accordance with a desired leg extension spanning EX.
And the second leg 24 is extended within the range of the maximum leg sliding spanning SL _max and the maximum leg swing spanning SW _MAX , so that the saw tooth optimal for the claw locking portion 11 is rotated. The predetermined ring expansion spanning EX is obtained by engaging the claw-shaped claw 9.

[0009]

However, once the conventional manhole pipe joint mounting ring 6 is fixed in the expanded state, the holding force on the pipe joint 4 is maintained extremely strong. When it is necessary to remove the pipe joint, the rubber part of the pipe joint 4 and a part of the fitting ring 6 for the pipe joint are damaged, and it is easy to make the pipe unusable.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art and to provide a ring removing device capable of easily and reusably removing a manhole fitting ring for a manhole. is there.

[0011]

SUMMARY OF THE INVENTION The object of the present invention is as follows.
Along the inner peripheral surface of a flexible pipe fitting, a part of which is fitted into a mounting hole penetrated through the peripheral wall of the manhole, the fitting ring for the pipe fitting which is expanded and fixed concentrically with the pipe fitting is removed. For removing a fitting, the fitting ring for a fitting being formed integrally with a flange portion along a circumferential edge thereof, and further having an overlap sufficient to enable locking of both ends thereof with the expansion. An annular hoop portion having a region, and an inner peripheral side terminal portion 13 of the hoop portion in the overlap region and the vicinity thereof partially remove the flange portion while projecting on the inner peripheral surface thereof. A plurality of serrated claw portions provided, and a claw lock erected so as to be capable of locking the claw portions across the upper side of the claw portions in the vicinity of the outer peripheral end portion of the hoop portion in the overlap region. Part and the inner and outer peripheral side terminal part The ring removal device comprises a pair of left and right forks, and a front support portion bridged on an upper surface of the fork portion, the leg support portion being provided on each of the flange portions located outside the overlap region. This is achieved by a ring removing device comprising a pushing force receiving portion supported by a front support portion and a rear support portion provided on a lower surface of the fork portion.

Further, it is an object of the present invention to provide a ring removing device in which the ring removing device is swingably suspended via a first pivot and a second pivot along a longitudinal direction of the beam. A first leg and a second leg, and extending from one end of the beam toward the axis of the second pivot along the longitudinal direction of the beam, and extending the second leg along the leg sliding span. A sliding screw portion that slides while extending between the first supporting shaft of the first leg portion and the second supporting shaft of the second leg portion in parallel with the sliding screw portion to extend the second leg portion. An expanding / contracting screw portion for oscillating / expanding along the part oscillating span, a first and second locking claw portion provided at each lower end of each of the first and second legs, A first and a second engaging claw provided on the inner end surface of each lower end of the second leg so as to be exposed;
And a second notch portion, the distal end portion of the fork portion is pushed into the claw locking portion via the first locking claw portion, and the claw locking portion is expanded and deformed. To release the engagement with the claw portion.

[0013] In the ring removing device of the present invention, the fitting ring for the pipe joint integrally forms a flange portion along a circumferential edge of the fitting portion, and further enables locking of both ends thereof with the expansion. A hoop portion formed in an annular shape having a sufficient overlap region, an inner peripheral side terminal portion of the hoop portion in the overlap region and the vicinity thereof partially remove the flange portion, and an inner peripheral surface thereof. A plurality of serrated claw portions projecting upward, and the claw portion is erected so as to be able to lock over the claw portion in the vicinity of an outer peripheral side end portion of the hoop portion in the overlap region. A claw engaging portion, and a leg receiving portion provided on each of the flange portions located outside the overlap region of the inner / outer peripheral side terminal portion, wherein the ring removing device includes a pair of left and right fork portions; On the top of the department The claw, which is engaged with the claw portion, includes a front support portion provided, a pushing force receiving portion supported by the front support portion, and a rear support portion provided on a lower surface of the fork portion. By inserting the tip of the fork into the engaging portion by an external force appropriately applied from a pushing means for the pushing force receiving portion and expanding and deforming the engaging portion, the engagement of the engaging portion is relatively small. Release easily.

Further, in the ring removing device of the present invention, the ring removing device is swingably suspended via a beam portion and a first pivot and a second pivot along the longitudinal direction of the beam. A first leg and a second leg extending from one end of the beam along the longitudinal direction of the beam toward the axis of the second pivot to make the second leg a leg sliding span; A sliding screw portion that slides along the first leg portion, and extends between the first support shaft of the first leg portion and the second support shaft of the second leg portion in parallel with the sliding screw portion to extend the second leg portion. An expansion / contraction screw portion for oscillating and expanding along a leg oscillating span, and a first and a second portion disposed at each lower end of each of the first and second legs.
A locking claw, and first and second notches provided on the inner end surfaces of the lower ends of the first and second legs so that the first and second locking claw are exposed. By the closing operation of the mounting ring expanding / contracting device, the distal end of the fork portion is pushed into the claw locking portion via the first locking claw portion, and the claw locking portion is expanded and deformed. Is disengaged, the pushing operation on the pushing force receiving portion is more easily and reliably performed by applying the attachment ring expanding / contracting device.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the ring removing device of the present invention will be described below in detail with reference to the accompanying drawings. The members common to the above-mentioned conventional manhole pipe joint and the pipe joint mounting ring will be described using the same reference numerals. FIG. 1 is a plan view of a ring removing device 60 of the present invention, FIG. 2 is a cross-sectional view taken along the line CC of FIG. 1, and FIG. FIG. 6 is a sectional view of a ring removing device 60 of FIG.

In the present invention, the fitting ring 6 for a pipe joint is also provided.
A rubber pipe joint 4 having flexibility is provided in a mounting hole 2 penetrated through a peripheral wall of the manhole 1 in the same manner as the manhole 1 described above.
Of the pipe joint 4 is further expanded along the inner peripheral surface of the pipe joint 4 concentrically with the pipe joint 4.
And the inner surface of the mounting hole 2 is hermetically sealed. On the other hand, the end opposite to the manhole of the pipe joint 4 is tightened by another mounting ring 5 so that the outer peripheral surface thereof binds the connection pipe 3 inserted into the inside of the pipe joint 4,
The pipe connection to the manhole 1 is completed.

Furthermore, the fitting ring 6 for the pipe joint is shown in FIG.
As is apparent from FIG. 7, the flange portion 8 is integrally formed along the circumferential edge on both sides thereof, and furthermore, an overlap region sufficient to enable the both ends to be locked with the expansion. And a hoop 7 formed in an annular shape with the hoop portion 7 in the overlap region 12.
The inner peripheral end portion 13 and the vicinity thereof are partially removed from the flange portion 8 to facilitate the overlap with the outer peripheral end portion 14 described later, while a plurality of sawtooth-shaped portions are formed on the inner peripheral surface. Are provided. The overlap area
The hoop portion 7 in 12 includes a claw locking portion 11 which can lock the claw portion 9 across the claw portion 9 in the vicinity of the outer peripheral side terminal portion 14, and further includes the inner and outer peripheral portions. Side terminals 13, 14
Each of the flange portions 8 located outside the overlap region 12 includes a leg receiving portion 10a, 10b.

When the pipe joint mounting ring 6 is expanded concentrically with the pipe joint 4 along the inner peripheral surface of the pipe joint 4, for example, a mounting ring expanding / contracting device 40 as shown in FIG.
Is used. The mounting ring expanding / contracting device 40 includes a beam portion 41, and first leg portions swingably suspended along a longitudinal direction of the beam portion 41 via a first pivot 50 and a second pivot 51, respectively.
43 and the second leg portion 44 extend from one end of the beam portion 41 toward the axis of the second pivot 51 along the longitudinal direction of the beam portion 41 so that the second leg portion 44 is a leg sliding span. The sliding screw portion 42 for sliding along the SL, the first support shaft 52 of the first leg portion 43
And an expansion / contraction screw extending between the second support shaft 53 of the second leg portion 44 and parallel to the sliding screw portion 42 to pivotally expand and contract the second leg portion 44 along the leg swing span SW. Part 45, first and second locking claws 43a, 44a disposed at the lower ends of the first and second legs 43, 44, and the first and second legs 4
First and second notches 43b and 44b are provided on the inner end surfaces of the lower ends of the first and second lower end portions so as to expose the first and second locking claws 43a and 44a.

The first leg 43 is connected to the beam 41
In contrast, since the sliding screw portion 42 does not reach a boss (not shown) integrated with the first pivot 50 so as to be swingable via the first pivot 50, If there is sufficient mechanical strength, the boss can be omitted. Further, a boss (not shown) of the first leg 43 through which the expansion screw 45 penetrates is provided at one end of the beam 41 through which the sliding screw 42 penetrates. Similar to (not shown), a female screw is not formed, and a retaining member is added, so that the sliding screw portion 42 is simply allowed to rotate.

On the other hand, the second leg portion 44 is connected to the beam portion 41.
On the other hand, a female screw screwed to the sliding screw portion 42 is provided on a boss (not shown) which is swingably supported via the second pivot 51 and is integrated with the second pivot 51. When the sliding screw portion 42 is rotated substantially in synchronization with the expansion / contraction screw portion 45, the sliding screw portion 42 penetrates the slit 54 provided in the front and rear surfaces of the beam portion 41 in a loosely fitted state. 2 Axis 51
The second leg portion 44 slides along the leg sliding span SL through the stem portion. Further, the second leg 44
Since a female screw to be screwed with the expansion / contraction screw portion 45 is engraved on a boss (not shown) integrated with the second support shaft 53, the expansion / contraction screw portion 45 is connected to the sliding screw. When rotated substantially in synchronism with the part 42, it swings and expands and contracts along the leg swing span SW.

With respect to the fitting ring 6 for a pipe joint before the expansion of the overlap region 12, the inner and outer peripheral end portions 13 and 14 The outer end surfaces of the first and second locking claws 43a and 44a are brought into contact with the peripheral edges of the respective leg receiving portions 10a and 10b closer to each other, and the sliding screw portion 42 and the expansion / contraction screw portion 45 are substantially Rotating while synchronizing, the second leg 44 is expanded within the range of the maximum leg sliding spanning SL _max and the maximum leg swinging spanning SW _MAX , and the saw-toothed shape optimal for the claw locking portion 11 is formed. The predetermined ring expansion span EX is obtained by engaging the claws 9.

Next, when removing the fitting ring 6 for a pipe joint from the inner peripheral surface of the pipe joint 4, a ring removing device 60 shown in FIGS. 1 and 2 is prepared. The ring removing device 60 includes a pair of left and right forks 61
A front support section 62 erected on the upper surface of the front support section 61;
A pushing force receiving portion 63 supported by 62;
And a rear support portion 64 erected on the lower surface of 61.
The ring removing device 60 includes the pair of left and right forks.
61 is parallel to both sides of the claw portion 9 avoiding the claw portion 9, and the front support portion 62 is bridged on the upper surface slightly behind the tip portion, and a substantially S-shaped cross section is formed with respect to the front support portion 62. Thus, the pushing force receiving portion 63 is integrally formed. The rear support portion 64 bridged to the lower surface of the rear end portion of the pair of left and right forks 61 is provided on the inner peripheral side terminal portion 13 of the hoop portion 7 in the overlap region 12 and the vicinity thereof, and the ring removal device is provided. The extension height is made uniform over the entire length of 60.

Next, as shown in FIG.
The ring removal device 60 with the fork 61
The whole is mounted on the upper surface of the claw group 9 protruding near the inner peripheral side terminal portion 13 of the hoop portion 7. Thereafter, the first leg portion 43 and the first locking claw portion of the mounting ring enlarging / reducing device 40 are provided on a peripheral edge of the leg receiving portion 10a of the pipe joint mounting ring 6 near the inner peripheral terminal portion 13. 43a, the second cutout portion 44b of the second leg portion 44 and the second locking claw portion are provided on the outer peripheral edge of the leg receiving portion 10b with respect to the outer peripheral side terminal portion 14. Abut each inner end face of 44a.

Next, the expansion / contraction screw portion 45 is rotated in the direction opposite to that when the leg is opened so that the inner end surface of the first locking claw portion 43a is inserted into the pushing force receiving portion 63. One leg 43
And the second leg 44 is operated to the closed state. In this closed state, the first leg 43 is drawn toward the second leg 44, so that a pushing force is applied to the pushing force receiving portion 63 via the inner end surface of the first locking claw 43a. ,
The ring removing device 60 moves toward the claw locking portion 11.

Further, when the closed state of the leg is continued, the tip of the fork portion 61 fits into a narrow gap between the inner surface of the upper wall of the claw engaging portion 11 and the claw portion 9, and the claw which has been slightly inclined in time. Since the inner surface of the locking wall of the locking portion 11 is pushed up to expand and deform the narrow gap, the claw portion 9 engaged with the claw locking portion 11 is separated, and the fitting ring 6 for the pipe joint is removed. The bore size is reduced and easily detached from the inner peripheral surface of the pipe joint 4. In this way, the pipe joint 4 from which the pipe joint mounting ring 6 is detached can be pulled out from the mounting hole 2 of the manhole 1 very easily.

The pushing force receiving portion 63 is not limited to have an S-shaped cross section, but may have
What is necessary is just to have the concave part which can receive the inner end surface of a. The first and second notches 43b, 44b provided on the inner end surfaces of the first and second locking claws 43a, 44a are respectively provided with the leg receiving portions.
The first and second locking claw portions abutting on the peripheral portions of 10a and 10b
If the end faces of 43a and 44a are sufficiently projected, they may be omitted.

[0027]

The above-described ring removing device 60 of the present invention has the following novel effects. In other words, in the ring removing device 60 of the present invention, the fitting ring 6 for the pipe joint integrally forms the flange portion 8 along the circumferential edge thereof, and the both ends can be locked with the expansion. The hoop portion 7 formed in an annular shape with the overlap region 12 being sufficient, and an inner peripheral side terminal portion of the hoop portion 7 in the overlap region 12
13 and its vicinity partially remove the flange portion 8, while a plurality of serrated claw portions 9 protruding on the inner peripheral surface thereof and the outer peripheral side of the hoop portion 7 in the overlap region 12. The claw locking portion 11 erected so as to be able to lock the claw portion 9 across the claw portion 9 in the vicinity of the terminal portion 14, and the overlap region 12 of the inner and outer peripheral side terminal portions 13, 14. Each leg receiving portion 10 provided on each of the flange portions 8 located outside
a, 10b, wherein the ring removing device 60 includes a pair of left and right forks 61, the front support 62 provided on the upper surface of the fork 61, and the push-in supported by the front support 62. Since the force receiving portion 63 and the rear support portion 64 provided on the lower surface of the fork portion 61, the tip of the fork portion 61 is located in the claw engaging portion 11 with which the claw portion 9 is engaged. The claw portion 9 is inserted by an external force appropriately applied from a pushing means to the pushing force receiving portion 63, and the claw locking portion 11 is further expanded and deformed.
Can be released relatively easily.

Further, the ring removing device 60 of the present invention
A first portion extending along the longitudinal direction of the beam portion 41;
A first leg 43 and a second leg 44, which are swingably suspended via a pivot 50 and a second pivot 51, respectively, from one end of the beam 41 along the longitudinal direction of the beam 41; The second pivot 51
The sliding screw portion 42 extending toward the axis of the sliding screw portion to slide the second leg portion 44 along the leg portion sliding span SL.
The second leg portion 44 extends between the first support shaft 52 of the first leg portion 43 and the second support shaft 53 of the second leg portion 44 in parallel with the sliding screw portion 42 to connect the second leg portion 44 to the leg. The expansion / contraction screw portion 45 for oscillating / expanding along the part oscillating span SW, and the first and second locking claws provided at the lower end of each of the first and second legs 43, 44. Portions 43a, 44a and the first and second leg portions 43, 4
The first and second locking pawls on the inner end face of each lower end
When the mounting ring expanding / contracting device 60 including the first and second cutout portions 43b and 44b provided so that the 43a and 44a are exposed, the fork portion 61 is moved through the first locking claw 43a. Is pushed into the claw locking portion 11 and the claw locking portion 11 is expanded and deformed to release the engagement with the claw portion 9. The application of the mounting ring expanding / contracting device 40 has made it possible to perform the operation more easily and reliably.

[Brief description of the drawings]

FIG. 1 is a plan view of a ring removing device of the present invention.

FIG. 2 is a sectional view taken along the line CC of FIG. 1;

3 is a cross-sectional view of the ring removing device of the present invention, showing a state after attachment of the portion A in FIG. 5 similarly to FIG. 8;

FIG. 4 is a sectional view of a main part of a manhole in a state where connection is completed and a conventional connection pipe.

FIG. 5 is a partially cutaway front view showing a state before mounting of a conventional fitting ring for fitting for expanding the inner peripheral surface of a flexible fitting.

FIG. 6 is a plan view of a portion A in FIG. 5;

FIG. 7 is a sectional view taken along line BB of FIG. 6;

FIG. 8 is a cross-sectional view showing a state after mounting the part A in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manhole 2 Mounting hole 3 Connection pipe 4 Fitting 5 Another mounting ring 6 Conventional mounting ring for fitting 7 Hoop part 8 Flange part 9 Claw part 10a, Leg receiving part 10b Leg receiving part 11 Locking nail part 12 Overlap Area 13 Inner peripheral end 14 Outer peripheral end 20 Conventional mounting ring expanding device 21 Beam 22 Sliding screw 23 First leg 23a First locking claw 24 Second leg 24a Second locking claw 25 Expansion screw part 30 1st axis 31 2nd axis 32 1st axis 33 2nd axis 34 Slit SL Leg sliding slide SW Leg swing rocking span EX Leg expansion span 40 Mounting ring expansion and contraction device 41 of the present invention 41 Beam Part 42 Sliding screw part 43 First leg 43a First locking claw 43b First notch 44 Second leg 44a Second locking claw 44b Second notch 45 Expansion screw 50 First pivot 51 Second Axis 52 First support shaft 53 Second support shaft 54 Slit 60 Ring removing device of the present invention 61 Fork portion 62 Square support 63 pushing force receiving portion 64 rear supporting portion

Claims (2)

[Claims] 1. A pipe joint 4 having a part fitted in a mounting hole 2 penetrated through a peripheral wall of a manhole 1 and extending and fixed concentrically with the pipe joint 4 along the inner peripheral surface thereof. A ring removing device for removing the fitting ring 6 for a pipe joint, wherein the fitting ring 6 for a pipe joint integrally forms a flange portion 8 along a circumferential edge thereof, and further includes the expansion of both end portions thereof. Overlap area 12 sufficient to allow locking with
A hoop portion 7 having an annular shape and having an inner peripheral end portion 13 of the hoop portion 7 in the overlap region 12
And the vicinity thereof partially removes the flange portion 8,
A plurality of saw-tooth-shaped claws 9 protruding on the inner peripheral surface thereof, and a portion of the overlap region 12 near the outer peripheral side terminal portion 14 of the hoop portion 7 traversing above the claw portions 9. A claw locking portion 11 provided so as to be able to lock the claw portion 9, and each leg receiving portion 10 a, provided on each of the flange portions 8 located outside the overlap region 12 of the inner and outer peripheral side terminal portions 13, 14. 10b, wherein the ring removal device 60 is a pair of left and right fork portions 61
And a front support portion 62 erected on the upper surface of the fork portion 61.
And a pushing force receiving portion 63 supported by the front support portion 62
And a rear support portion 64 erected on the lower surface of the fork portion 61.
And a ring removing device. 2. The apparatus according to claim 1, wherein the ring removing device includes a beam unit.
41, and a first leg 43 slidably suspended along a longitudinal direction of the beam portion 41 via a first pivot 50 and a second pivot 51, respectively.
And a second leg portion 44 extending in the longitudinal direction of the beam portion 41 from one end of the beam portion 41 toward the axis of the second pivot 51 so as to move the second leg portion 44 into a leg sliding span. A sliding screw portion for sliding along the SL, and a first support shaft of the first leg portion 43
52 extends between the second support shaft 53 of the second leg 44 and the second support shaft 53 and extends in parallel with the sliding screw portion 42 to swing the second leg 44 along the leg swinging span SW to expand and contract. A screw portion 45, first and second locking claws 43a, 44a disposed at lower ends of the first and second legs 43, 44, and first and second legs, respectively; Mounting ring expanding and contracting device 40 comprising first and second notches 43b and 44b provided on the inner end surfaces of the lower ends of the first and second locking claws 43a and 44a so as to be exposed. By pushing the leg closed, the tip of the fork 61 is pushed into the claw locking portion 11 via the first locking claw 43a,
The ring removing device according to claim 1, wherein the claw locking portion (11) is expanded and deformed to release the engagement with the claw portion (9).