JP4128019B2 - Detachment prevention device for pipe joints - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a detachment of a pipe joint part that prevents the receiving pipe part and the insertion pipe part inserted and connected to the receiving pipe part from detaching in the direction of the pipe axis due to an external force caused by an earthquake or unequal subsidence. Regarding the prevention device, in detail, on the inner peripheral surface side of the press ring fixedly connected to the receiving tube portion in the state of being sheathed on the inserting tube portion inserted and connected to the receiving tube portion, on the outer surface of the insertion tube portion. A swallowable retaining member is mounted, and between the outer peripheral surface of the retaining member and the inner peripheral surface of the press ring, the retaining member is moved in the tube radial direction along with the relative separation movement of both pipe portions. The present invention relates to an apparatus for preventing separation of a pipe joint portion provided with a biting guide means for biting and moving inward.
[0002]
[Prior art]
In the conventional pipe joint part detachment preventing device, as shown in FIG. 10, the recesses 51 that open toward the tube axis X side are formed at a plurality of locations in the circumferential direction of the pusher wheel 50. A retaining member 52 having a width smaller than the inner dimension of the concave portion 51 in the tube axis X direction and having biting protrusions 52a formed at both ends of the inner surface in the tube axis X direction; A holding member 53 having a biting guide surface 53a of the same gradient that is in sliding contact with an inclined receiving surface 52b that has a larger diameter toward the receiving tube portion 1 side formed on the outer surface of the retaining member 52 is connected to the tube axis. It is movably mounted on the X side.
[0003]
Furthermore, the retaining member 52 and the holding member 53 are moved by the relative separation movement of the both tube portions 1 and 2 by the maximum movement allowance W in the tube axis direction of the retaining member 52 located in each recess 51. Of the side wall portions 50A and 50B that face each other in the tube axis X direction that constitutes a part of the recess 51 when relatively moved in the tube axis X direction, the side wall portion 50B that is the furthest away from the receiving tube portion 1 On the other hand, the one end face of the retaining member 52 opposite to this is in contact with the tube axis direction X to prevent further removal movement of the retaining member 52, and each recess The ceiling wall portion 50 </ b> C constituting a part of 51 can be moved and operated along the pipe radial direction, and the retaining member 52 is pressed against the outer peripheral surface 1 a side of the inlet tube portion 1 through the pressing member 53. The pressing bolt 54 is screwed, and the pressing bolt 54 and the biting guide surface 53a With the holding member 53 provided and the inclined receiving surface 52b of the retaining member 52, the biting guide for biting and moving the retaining member 52 inwardly in the tube radial direction as the both pipe portions 1 and 2 move relative to each other. Means A was constructed (see, for example, Japanese Utility Model Publication No. 61-97683).
[0004]
[Problems to be solved by the invention]
In the conventional pipe joint part detachment preventing device, the side wall part 50B farthest from the receiving pipe part 1 among the side wall parts 50A and 50B constituting a part of the recess 51, and the pipe axis Between the end faces of the retaining member 52 facing each other in the X direction, the retaining member 52 is bitten inward in the pipe diameter direction to the maximum biting position as the both pipe parts 1 and 2 move relative to each other. Since it is necessary to secure a movement allowance for the movement, the width of the pusher wheel 50 in the tube axis X direction is increased, which increases the weight of the pusher wheel 50 and increases the manufacturing cost.
[0005]
The present invention has been made in view of the above-described actual situation, and the main problem thereof is that of a push ring formed to prevent extraction movement of the retaining member to the side away from the receiving pipe portion. By rationally remodeling the wall, reduce the manufacturing cost and reduce the weight while securing the movement allowance to move the retaining member inwardly in the radial direction to the maximum biting position. It is in the point which provides the disconnection prevention apparatus of the pipe joint part which can be performed.
[0006]
[Means for Solving the Problems]
In the present invention, it is possible to bite the outer peripheral surface of the insertion tube portion on the inner peripheral surface side of the press ring fixedly connected to the reception tube portion in the state of being installed on the insertion tube portion inserted and connected to the reception tube portion. A retaining member is mounted, and a wall portion for preventing the retaining member from being moved away from the receiving tube portion is connected to the pusher wheel, and between the retaining member and the pusher wheel. is the separation preventing device for a pipe joint portion biting guiding means is provided to喰Komi moved in the tube diameter inward side retainer member As the relative withdrawal movement of the two pipe portions,
Between the opposing surfaces of the inner side surface of the wall portion and the outer peripheral surface of the insertion tube portion, a gap portion into which a part of the retaining member can enter from the tube axis direction is formed, and the inner side surface of the wall portion In addition, an auxiliary biting guide surface may be formed to bite and move the retaining member inwardly in the pipe radial direction as it slides into contact with the outer surface of the retaining member that enters and moves into the gap. .
[0007]
According to the above configuration , the wall portion connected to the push wheel prevents the movement of the retaining member attached to the inner peripheral surface side of the push wheel to the side away from the receiving tube portion, Along with the relative detachment movement of both pipe parts due to unequal subsidence etc., a part of the retaining member is in the gap formed between the inner surface of the wall part and the outer peripheral surface of the insertion tube part. The inner surface of the wall is moved into the tube radially inward by the biting guide means provided between the retaining member and the press ring. The outer surface of a part of the retaining member that enters and moves into the gap is in sliding contact with the auxiliary engulfment guide surface formed on the inner surface, and a part of the retaining member is engulfed and moved inwardly in the pipe radial direction. The entire retaining member is bitten and moved to the maximum biting position.
[0008]
Therefore, the inner surface of the wall portion and the outer peripheral surface of the insertion tube portion are utilized by using the wall portion formed on the press ring in order to prevent the removal movement of the retaining member to the side away from the receiving tube portion. Between the surfaces facing each other, a part of the retaining member is formed as a gap that can be inserted from the tube axis direction, so that the width of the pusher wheel in the tube axis direction is reduced and the retaining member is maximized. Since it is possible to secure a movement allowance for biting and moving inward in the pipe radial direction to the insertion position, it is possible to reduce the manufacturing cost and reduce the weight.
[0009]
In addition, a part of the retaining member that enters and moves into the gap portion is slidably contacted with the auxiliary biting guide surface of the wall portion and is bitten and guided to the inner side in the radial direction of the pipe. By cooperating with the guide guide surface, the entire retaining member can be securely and engulfed to the engulfing position corresponding to the external force.
[0010]
In the present invention , the biting guide means includes an inclined receiving surface having a larger diameter toward the receiving pipe portion formed on the outer side surface of the retaining member, and a biting guide surface having the same gradient in sliding contact therewith. The holding member and a pressing screw member that presses the retaining member to the insertion tube portion side through the retaining member, and the width of the retaining member in the tube axis direction is determined by the retaining member. May be configured to be larger than the inner dimension in the tube axis direction of the concave portion that can be stored in a movable manner in the tube diameter direction.
[0011]
According to the above configuration , the initial biting state of the retaining member with respect to the outer peripheral surface of the insertion tube portion can be freely adjusted by the screwing operation of the pressing screw member, and at the time of relative detachment movement of both the tube portions. While the relative sliding movement between the biting guide surface of the pressing member and the inclined receiving surface of the retaining member is reliably and smoothly performed, the retaining member can be thinned by the amount of the retaining member interposed. . In addition, when the retaining member is mounted on the inner peripheral surface side of the push ring, a part of the retaining member is formed between the opposing surfaces of the inner surface of the wall portion and the outer peripheral surface of the insertion tube portion. Since it enters into the section, it is possible to promote a reduction in the width of the push ring in the tube axis direction.
[0012]
In the present invention , biting protrusions are formed at both ends of the inner surface of the retaining member in the tube axis direction, and the auxiliary biting guide surface of the wall portion is assumed to pass through the inclined receiving surface of the retaining member. You may be comprised more steeply than this inclination receiving surface in the state which cross | intersects an extended surface.
[0013]
According to the above configuration , with the relative separation movement of both pipe parts due to an earthquake, unequal settlement, etc., a part of the retaining member is opposed to the inner side surface of the wall part and the outer peripheral surface of the insertion pipe part. When entering and moving from the tube axis direction into the gap formed between the surfaces, the auxiliary biting guide surface of the wall intersects the virtual extension surface passing through the inclined receiving surface of the retaining member, and the inclined receiving surface Therefore, a part of the retaining member that has entered and moved into the gap can be surely engulfed and moved inward in the pipe radial direction.
[0014]
That is, one end portion in the tube axis direction of the inclined receiving surface of the retaining member is in sliding contact with the auxiliary biting guide surface of the wall portion, and the other end portion in the tube axis direction of the inclined receiving surface of the retaining member is Since the biting projections are formed at both ends in the tube axis direction of the inner surface of the retaining member corresponding to each sliding contact location, the entire retaining member is engulfed by external force. It is possible to bite and move more securely to the position.
[0015]
In the present invention , the pressing screw member is screwed to the wall portion from a direction parallel to or substantially parallel to the tube axis direction, and is formed on the outer surface of the pressing member at the distal end portion of the pressing screw member. A tapered wedge portion that abuts on an inclined surface having a larger diameter toward the receiving tube portion side may be formed.
[0016]
According to the above configuration , the pressing force of the retaining member against the outer peripheral surface of the insertion tube portion can be increased by the wedge action at the contact portion between the tapered wedge portion of the pressing screw member and the inclined surface of the pressing member. In addition to the relative sliding movement at the contact point between the tapered wedge portion of the pressing screw member and the inclined surface of the pressing member during the relative detachment movement of both pipe portions due to an earthquake, uneven settlement, etc., and The relative sliding movement between the biting guide surface of the holding member and the inclined receiving surface of the retaining member increases the biting force of the retaining member with respect to the outer peripheral surface of the insertion tube portion, thereby improving the separation preventing effect. [0017]
In the present invention , the retaining member is elastically deformable in the radial direction, and is formed in a C-shape in which thick portions and thin portions are alternately positioned in the circumferential direction. A pressing member and a pressing screw member may be disposed at each of the portions corresponding to the thick portions of the member.
[0018]
According to the above configuration , each thick portion of the retaining member is inserted through each pressing member by screwing operation of the pressing screw member disposed in each of the portions corresponding to each thick portion of the retaining member. By pushing and moving to the outer peripheral surface of the pipe part, the retaining member can be easily elastically deformed in the radial direction at the thin wall portion while ensuring the effect of preventing the detachment of both pipe parts. The mounting work of the retaining member on the peripheral surface side can be facilitated.
[0019]
In the present invention , the end of the retaining member that enters and moves into the gap from the inner surface of the wall portion from the tube axis direction, and the biting protrusion formed on the inner surface of the retaining member A step portion that regulates the biting depth to the set maximum biting depth may be formed.
[0020]
According to the above configuration , with the relative separation movement of both pipe parts due to an earthquake, unequal settlement, etc., a part of the retaining member is opposed to the inner side surface of the wall part and the outer peripheral surface of the insertion pipe part. A retaining member when entering and moving from the axial direction of the tube into the gap formed between the surfaces, and being slidably in contact with the auxiliary biting guide surface of the wall and being guided by biting inward in the tube radial direction When the biting depth of the biting protrusion formed on the inner side of the tube reaches the set maximum biting depth, the end of the retaining member is connected to the step formed on the inner side of the wall. Contact from the axial direction prevents further biting movement.
[0021]
Therefore, since the biting depth of the retaining member can be regulated to the set maximum biting depth, the corrosion-proof lining layer applied to the inner peripheral surface of the inlet tube portion is not damaged such as cracking or peeling. Generation | occurrence | production can be suppressed favorably.
According to the first aspect of the present invention, there is provided an insertion port on the inner peripheral surface side of a press ring fixedly connected to the receiving tube part in a state where the outer tube is inserted and connected to the receiving tube unit. A retaining member that can be eaten on the outer peripheral surface of the tube portion is mounted, and a wall portion that prevents extraction movement of the retaining member to the side away from the receiving tube portion is connected to the pusher wheel, and Between the retaining member and the push ring, there is provided a biting guidance means for biting and moving the retaining member inwardly in the pipe radial direction as the both pipe parts move relative to each other. A holding member having an inclined receiving surface formed on the outer side surface of the retaining member and having a larger diameter toward the receiving pipe portion side, and a biting guide surface having the same gradient in sliding contact with the holding member, and via the holding member To prevent the pipe joint portion from being separated from the pressing screw member that presses the retaining member toward the insertion tube portion. A location,
Between the opposing surface of the inner side surface of the wall portion and the outer peripheral surface of the insertion tube portion, there is formed a gap portion into which a part of the retaining member can be inserted from the tube axis direction, and the inside of the wall portion On the side surface, an auxiliary biting guide surface is formed which bites and moves the retaining member inward in the radial direction of the tube with sliding contact with the inclined receiving surface of the retaining member that enters and moves into the gap. The auxiliary biting guide surface is configured to be steeper than the tilted receiving surface and the biting guide surface in a state of intersecting a virtual extension surface passing through the angled receiving surface of the retaining member and the biting guide surface of the holding member. There is in point.
The characteristic configuration according to claim 2 of the present invention is such that the width of the retaining member in the tube axis direction is the inner dimension in the tube axis direction of the recess of the press ring capable of accommodating the presser member movably in the tube diameter direction. It is in a point that is configured larger than.
According to a third aspect of the present invention, the pressing screw member is screwed to the wall portion from a direction parallel to or substantially parallel to the tube axis direction, and at the distal end portion of the pressing screw member. The tapered wedge portion that contacts the inclined surface having a larger diameter toward the receiving tube portion formed on the outer surface of the pressing member is formed. The tapered surface of the wedge portion of the pressing screw member and the inclined surface of the pressing member However, there exists in the point comprised rather than the inclination receiving surface of the said retaining member, and the biting guide surface of a pressing member.
According to a fourth aspect of the present invention, the pusher wheel is made of a steel plate, and the presser member is disposed at a plurality of locations in the circumferential direction so that the presser member can be movably accommodated in the pipe radial direction. A concave portion that opens toward the top is formed, and each concave portion includes an annular first side wall portion and a second side wall that opposes each concave portion forming portion of the first side wall portion in the tube axis direction. And the third side wall portion located on both sides in the circumferential direction of each recess forming portion, and the first side wall portion. The two side wall portions are configured as wall portions that prevent the removal movement of the retaining member toward the side away from the receiving tube portion.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
1 to 7 show a separation preventing device for a pipe joint portion of a fluid transport pipe (for example, a water pipe or a gas pipe) P, and the other of the fluid transport pipe P inserted and connected to the receiving pipe portion 1. The insertion tube portion 2 of the fluid transport tube P is made of an annular synthetic rubber (for example, styrene butadiene) capable of sealing between the inner peripheral surface 1a of the reception tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2. (Rubber) sealing material 3 and a steel-made pressing ring 4 that can be compressed to a sealed state (watertight state) by pressing the sealing material 3 from the tube axis X direction, and the pressing ring 4 Fastening means 5 is provided to fixably connect the receiving tube portion 1 to the tube axis X direction.
[0023]
The fastening means 5 is formed at bolt insertion holes 1b formed at a plurality of locations in the circumferential direction of the connecting flange portion 1A of the receiving pipe portion 1 and at a plurality of locations in the circumferential direction of the first side wall portion 4A of the press ring 4. The bolt insertion hole 4a, the T-shaped bolt 5A inserted across the bolt insertion holes 1b and 4a facing each other in the tube axis X direction, and the screw shaft portion of the bolt 5A screwed together And the pipe shaft of the pusher wheel 4 by the relative proximity movement of the pusher wheel 4 and the receiving pipe part 1 in the tube axis X direction accompanying the tightening operation of the bolt 5A and the nut 5B. The sealing material 3 is compressed and deformed by an annular seal pressing portion 4F formed at one end portion in the core X direction, and the gap between the inner peripheral surface 1a of the receiving tube portion 1 and the outer peripheral surface 2a of the insertion tube portion 2 is determined. Seal.
[0024]
The pusher wheel 4 is integrally formed in an annular shape that can be externally fitted to the end portion of the insertion tube portion 2 from the tube axis X direction. In the embodiment, eight locations) are formed with recesses 6 that open inwardly in the radial direction of the pipe. On the inner peripheral surface side of the pusher wheel 4, a metal that can bite into the outer peripheral surface 2 a of the insertion tube portion 2. A retaining member 7 made of metal is mounted, and between the retaining member 7 and the pusher wheel 4, the retaining member 7 is moved inwardly in the radial direction along with the relative detachment movement of both pipe portions 1 and 2. A biting guidance means A for biting and moving to the side is provided.
[0025]
As shown in FIG. 7, the retaining member 7 is elastically deformable in the radial direction, and a plurality of thick portions 7A and a plurality of thin portions 7B are alternately positioned in the circumferential direction. Are formed integrally with both ends of the inner side surface (inner peripheral surface) in the tube axis X direction, and triangular projections 7c continuous in the circumferential direction are formed integrally with each thick wall. The outer surface 7a of the portion 7A is formed as an inclined receiving surface having a larger diameter toward the receiving tube portion 1, and further, the outer surface 7b of each thin portion 7B is formed in a flat surface parallel to the tube axis X. ing.
[0026]
Each recess 6 of the pusher wheel 4 has an annular first side wall portion 4A through which a plurality of bolt insertion holes 4a are formed, and each recess formation portion of the first side wall portion 4A in the tube axis direction. Opposing second side wall portions (an example of a wall portion) 4B, a ceiling wall portion 4C positioned on the outer side in the pipe radial direction of each recessed portion forming portion, and first portions positioned on both sides in the circumferential direction of each recessed portion forming portion. A cover portion 4E that covers the outer side in the pipe radial direction of each thin portion 7B of the retaining member 7 is fixed between the adjacent concave portions 6 of the first side wall portion 4A. Further, the second side wall portion 4B is configured as a wall portion that prevents extraction movement of the retaining member 7 to the side away from the receiving tube portion 1.
[0027]
The biting guide means A includes an inclined receiving surface 7a which is formed on the outer surface of each thick portion 7A of the retaining member 7 and has a diameter that is larger toward the receiving tube portion 1 side, and in the recess 6 in the tube radial direction. A metal presser member 8 that is movably mountable and has a biting guide surface 8a of the same slope that comes into sliding contact with the inclined receiving surface 7a of the thick wall portion 7A, and is retained through the presser member 8 It is comprised from the press bolt 9 which is an example of the press screw member which presses the member 7 to the insertion tube part 2 side.
[0028]
As shown in FIGS. 1 and 3 , the pressing bolt 9 is screwed to the second side wall portion 4 </ b> B from a direction parallel to or substantially parallel to the tube axis X direction, and the distal end portion of the pressing bolt 9. A tapered wedge portion 9a is formed in contact with the inclined surface 8b having a larger diameter toward the receiving tube portion 1 formed on the outer surface of the pressing member 8, and the taper of the wedge portion 9a of the pressing bolt 9 is tapered. The inclined surface 8 b of the surface and the pressing member 8 is configured to be steeper than the inclined receiving surface 7 a of the retaining member 7 and the biting guide surface 8 a of the pressing member 8 .
[0029]
A part of each thick portion 7A of the retaining member 7 can enter from the direction of the tube axis X between the opposing surfaces of the inner side surface of each second side wall portion 4B and the outer peripheral surface 2a of the insertion tube portion 2. A gap S is formed, and the inner side surface of each second side wall 4B is in sliding contact with the inclined receiving surface 7a of each thick portion 7A of the retaining member 7 that enters and moves into the gap S. Along with this, an auxiliary biting guide surface 4b is formed which bites and moves the retaining member 7 inward in the pipe radial direction.
[0030]
Further , as shown in FIGS. 1 and 3 , the width of the retaining member 7 in the tube axis X direction is the same as the direction of the tube axis of the recess 6 that can hold the holding member 8 movably in the tube diameter direction. The auxiliary biting guide surface 4b of each second side wall portion 4B is assumed to pass through the inclined receiving surface 7a of the retaining member 7 and the biting guide surface 8a of the presser member 8. In the state which cross | intersects an extended surface, it is comprised more steeply than this inclination receiving surface 7a and the biting guide surface 8a .
[0031]
And with the relative detachment movement of both pipe parts 1 and 2 resulting from an earthquake, unequal subsidence, etc., a part of retaining member 7 and auxiliary biting guide surface 4b of 2nd side wall part 4B and insertion tube When the auxiliary biting guide surface 4b of the second side wall portion 4B moves into the gap S formed between the opposing surfaces of the portion 2 and the outer peripheral surface 2a from the tube axis X direction, the retaining member 7 Since it intersects with the virtual extension surface passing through the inclined receiving surface 7a and is steeper than the inclined receiving surface 7a, a part of the retaining member 7 that has entered and moved into the gap S is moved in the pipe radial direction. It can be surely bitten and moved to the side.
[0032]
That is, one end portion of the inclined receiving surface 7a of the retaining member 7 in the tube axis X direction is in sliding contact with the auxiliary biting guide surface 4b of the second side wall portion 4B, and the tube of the inclined receiving surface 7a of the retaining member 7 is provided. The other end side in the direction of the axis X is in sliding contact with the biting guide surface 8a of the presser member 8 which is a constituent member of the biting guidance means A, and the tube on the inner side surface of the retaining member 7 corresponding to each sliding contact location. Since the biting projections 7c are formed at both ends of the axial direction X, the entire retaining member 7 can be bited and moved more reliably and strongly to the biting position corresponding to the external force.
[0033]
[Second Embodiment]
In the first embodiment described above, the auxiliary biting guide surface 4b of each second side wall portion 4B intersects with the virtual extension surface passing through the inclined receiving surface 7a of the retaining member 7 than the inclined receiving surface 7a. Although configured to be steep, as shown in FIG. 8, the auxiliary biting guide surface 4 b of each second side wall portion 4 </ b> B is positioned on a virtual extension surface passing through the inclined receiving surface 7 a of the retaining member 7. You may comprise and implement the same inclination as this inclination receiving surface 7a.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.
[0034]
[Third Embodiment]
As shown in FIG. 9, the distal end portion of the retaining member 7 that enters and moves into the gap S at a position corresponding to the guide end of the auxiliary biting guide surface 4 b of the second side wall portion 4 </ b> B, which is an example of the wall portion of the push wheel 4, Formed by forming a step portion 10 that contacts the tube axis X direction and regulates the biting depth of the biting protrusion 7c formed on the inner surface of the retaining member 7 to the set maximum biting depth. You may do it.
[0035]
As the two pipe parts 1 and 2 are moved away relative to each other due to an earthquake, uneven settlement, etc., the distal end of the retaining member 7 is connected to the inner side surface of the second side wall part 4B and the outer peripheral surface 2a of the inlet pipe part 2. Enters and moves from the tube axis X direction into the space S formed between the opposing surfaces of the tube and slidably contacts the auxiliary biting guide surface 4b of the second side wall portion 4B and bites inward in the tube radial direction. When the guide movement is guided, when the biting depth of the biting projection 7c formed on the inner surface of the retaining member 7 reaches the set maximum biting depth, it is formed on the inner side surface of the second side wall portion 4B. The distal end portion of the retaining member 7 comes into contact with the stepped portion 10 from the tube axis X direction, and further biting movement is prevented.
In addition, since the other structure is the same as the structure demonstrated in 1st Embodiment, the same number is attached to the same structure location as 1st Embodiment, and the description is abbreviate | omitted.
[0036]
[Other Embodiments]
(1) In each of the above-described embodiments, the pusher wheel 4 is integrally formed in an annular shape that can be externally fitted to the end portion of the insertion tube part 2 from the tube axis X direction. You may comprise from the some division | segmentation pusher body divided | segmented into multiple in the circumferential direction.
(2) In each of the above-described embodiments, the retaining member 7 can be elastically deformed in the radial direction, and the plurality of thick portions 7A and the plurality of thin portions 7B are alternately positioned in the circumferential direction. However, the retaining member 7 may be divided into a plurality of parts in the circumferential direction.
(3) In each of the above-described embodiments, the biting guide means A can be mounted on the inclined receiving surface 7a of the retaining member 7 and the recess 6 so as to be movable in the pipe diameter direction, and the thick portion 7A. The metal pressing member 8 having the same inclination biting guide surface 8a that is in sliding contact with the inclined receiving surface 7a, and the pressing that presses the retaining member 7 toward the inlet tube portion 2 through the pressing member 8 Although it comprised from the volt | bolt 9, you may comprise from the inclination receiving surface 7a of the retaining member 7, and the press bolt 9 which presses this retaining member 7 directly to the inlet tube part 2 side. In short, as the biting guidance means A, any structure can be used as long as the retaining member 7 can be bitten and moved inward in the pipe radial direction as the both pipe parts 1 and 2 move relative to each other. A thing may be used.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view of a pipe joint separation preventing device showing a first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. 4 is an enlarged sectional view taken along line IV-IV in FIG. 2. FIG. 5 is a sectional view taken along line VV in FIG. 3. FIG. FIG. 8 is an enlarged cross-sectional side view of a pipe joint part detachment preventing device showing a second embodiment of the present invention. FIG. 9 is a pipe joint part detachment showing a third embodiment of the present invention. Fig. 10 is an enlarged cross-sectional side view of a conventional pipe joint detachment preventing device.
A Biting guidance means S Cavity X Tube shaft core 1 Receiving tube 2 Inserting tube 2a Outer peripheral surface 4 Push ring 4B Wall (second side wall)
4b Auxiliary biting guide surface 7 Detachment member 7A Thick portion 7B Thin portion 7a Outer surface (inclined receiving surface)
7c Engaging projection 8 Holding member 8a Engaging guide surface 8b Inclined surface 9 Pressing screw member (pressing bolt)
9a Tapered wedge part 10 Step part

Claims (4)

A retaining member that can bite into the outer peripheral surface of the inlet tube portion on the inner peripheral surface side of the press ring that is fixedly connected to the inlet tube portion in a state where the outer tube portion is inserted and connected to the inlet tube portion. And a wall portion that prevents the removal movement of the retaining member toward the side away from the receiving tube portion is connected to the pusher wheel, and both pipes are interposed between the retaining member and the pusher wheel. Is provided with a biting guide means for biting and moving the retaining member inwardly in the pipe radial direction as the part moves relatively away , and the biting guidance means is formed on the outer surface of the retaining member. A holding member having an inclined receiving surface that has a larger diameter toward the tube side, a biting guide surface having the same gradient in sliding contact with the holding surface, and a retaining member is pressed to the inlet tube portion side through the holding member. A device for preventing separation of a pipe joint portion composed of a pressing screw member ,
Between the facing surfaces of the inner surface and the inserted pipe section outer peripheral surface of the wall portion, together with the-inserting possible air gap portion from pipe axis direction of the retaining member is formed, among the wall portion the side surface, auxiliary biting guide surface for喰Komi move該抜stop member in the pipe diameter direction inwardly brought into sliding contact with the inclined receiving surface of the retainer member-inserting movement into the gap portion is formed, The auxiliary biting guide surface is configured to be steeper than the tilted receiving surface and the biting guide surface in a state of intersecting a virtual extension surface passing through the angled receiving surface of the retaining member and the biting guide surface of the holding member. and it is separation prevention device of the pipe joint portion. 2. The width in the tube axis direction of the retaining member is configured to be larger than the inner dimension in the tube axis direction of the recess of the presser wheel capable of storing the presser member movably in the tube diameter direction. Detaching prevention device for the pipe joint as described. The pressing screw member is screwed to the wall portion from a direction parallel to or substantially parallel to the tube axis direction, and a receiving portion formed on the outer surface of the pressing member is formed at the distal end portion of the pressing screw member. A tapered wedge portion is formed that contacts an inclined surface having a larger diameter toward the mouth tube portion side, and the tapered surface of the wedge portion of the pressing screw member and the inclined surface of the pressing member are inclined receiving surfaces of the retaining member and The apparatus for preventing separation of a pipe joint portion according to claim 1 or 2, wherein the device is configured to be steeper than the biting guide surface of the presser member . The presser wheel is made of a steel plate, and a plurality of recesses are formed at a plurality of locations in the circumferential direction of the presser wheel so as to open toward the inner side in the tube radial direction in a state in which the presser member can be moved in the tube radial direction. The recesses include an annular first side wall part, a second side wall part opposite to each recess forming part of the first side wall part in the tube axis direction, and a pipe radial direction of each recess forming part. The ceiling wall portion located on the outer side and the third side wall portion located on both sides in the circumferential direction of each recess forming portion are partitioned and formed, and the second side wall portion is an opening for the retaining member. The separation preventing device for a pipe joint part according to any one of claims 1 to 3, wherein the pipe joint part is configured to be a wall part that prevents extraction movement to a side away from the pipe part .

Images