A pipe leak repair device

Abstract

This invention proposes a pipe leak repair device, relating to pipe repair tools. The device includes a support column with one end as a connecting end and the other end as an operating end; a sealing gasket, annular in shape and fitted around the support column, the inner edge of which seals against the outer wall of the connecting end; multiple support rods evenly distributed along the circumference of the support column, one end of each rod hinged to the outer wall of the support column, and the other end fixedly connected to the sealing gasket; a folding mechanism positioned between the support column and the support rods, which expands and retracts radially along the support column under the action of the folding mechanism; and a positioning mechanism installed at the connecting end, which extends and retracts along the axis of the support column. This invention provides a pipe leak repair device capable of quickly repairing leaks in pressure pipelines.

Description

Technical Field

[0001] This invention relates to pipe repair tools, and more particularly to a pipe leak repair device. Background Technology

[0002] Pipelines are assemblies used to transport, distribute, mix, separate, discharge, meter, control, and stop the flow of fluids. They consist of pipes, fittings, flanges, bolted connections, gaskets, valves, other components or pressure-bearing parts, and supports. Pressure pipelines are a part of pipelines, specifically referring to all pipelines subjected to internal or external pressure.

[0003] In daily use, existing pressure pipelines are prone to surface damage due to prolonged exposure to the elements, leading to leaks. Current methods typically involve wrapping or welding to repair leaks, but wrapping is ineffective and welding is time-consuming. Therefore, there is an urgent need for a rapid repair device for pressure pipeline leaks to address these issues.

[0004] In view of this, based on years of experience in production and design in this and related fields, the inventor has designed a pipeline leak repair device through repeated experiments in order to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to provide a pipe leak repair device that can quickly repair leaks in pressure pipes.

[0006] To achieve the above objectives, the present invention provides a pipe leak repair device, wherein the pipe leak repair device comprises:

[0007] The support column has a connecting end at one end and an operating end at the other end.

[0008] A sealing gasket, in the form of a ring, is fitted over the support column, and the inner edge of the sealing gasket can seal against the outer wall of the connecting end.

[0009] Multiple support rods are evenly distributed along the circumference of the support column. One end of each support rod is hinged to the outer wall of the support column, and the other end of each support rod is fixedly connected to the sealing gasket.

[0010] A folding mechanism is disposed between the support column and the plurality of support rods, wherein the plurality of support rods are expanded and retracted radially along the support column under the drive of the folding mechanism;

[0011] A positioning mechanism is installed at the connecting end, and the positioning mechanism can extend and retract along the axis of the support column.

[0012] As described above, in the pipeline leak repair device, the outer wall of the connecting end protrudes radially outward along the support column to form a limiting step, the support rod is correspondingly hinged on the limiting step, and after the support rod is unfolded, the inner edge of the sealing gasket is sealed and engaged with the limiting step.

[0013] As described above, in the pipe leak repair device, the sealing gasket has an installation groove on the side facing the operating end that aligns with the support rod. The installation groove is arranged radially along the support column. The support rod passes through the installation groove and is fixedly connected to the bottom surface of the installation groove. The outer diameter of the sealing gasket is greater than the length of the installation groove.

[0014] As described above, in the pipe leak repair device, the folding mechanism includes a rotating shaft, a moving block, and multiple hinges. A first mounting cavity is provided within the support column. The rotating shaft is arranged along the axis of the support column and rotatably mounted within the first mounting cavity. The moving block has an axially penetrating mounting hole. The moving block is sleeved outside the rotating shaft and threadedly engaged with it. Each support rod is connected to the moving block via the hinge. Multiple sliding grooves are provided on the side wall of the support column to align with the support rods. The sliding grooves are parallel to the axis of the support column. One end of each hinge penetrates the sliding groove and is hinged to the moving block. The other end of the hinge is hinged to the support rod. The hinge can reciprocate along the sliding groove.

[0015] As described above, in the pipe leak repair device, the hinge includes a sliding block and a hinge rod. One end of the sliding block is fixedly connected to the moving block, and the other end of the sliding block passes through the groove and is hinged to one end of the hinge rod. The other end of the hinge rod is hinged to the support rod.

[0016] As described above, in the pipe leak repair device, bearings are respectively provided at both ends of the first mounting cavity, and the rotating shaft is rotatably mounted in the first mounting cavity through the two bearings.

[0017] As described above, in the pipeline leak repair device, the positioning mechanism includes a positioning tube and a buffer assembly. The rotating shaft has a second mounting cavity that extends axially. The positioning tube passes through the second mounting cavity and is threaded into the inner wall of the second mounting cavity. One end of the positioning tube protrudes from the connecting end and is fitted with the buffer assembly.

[0018] As described above, in the pipeline leak repair device, the buffer assembly includes a fixing ring, multiple fixing rods, and multiple telescopic rods. The fixing ring is sleeved on the outside of the positioning tube and fixedly connected to the positioning tube. The multiple fixing rods are evenly distributed around the circumference of the fixing ring. One end of each fixing rod is hinged to the fixing ring, and the other end of each fixing rod faces away from the connecting end. Each fixing rod is correspondingly connected to a telescopic rod. One end of each telescopic rod is hinged to the side wall of the fixing rod, and the other end of each telescopic rod is hinged to the outer wall of the positioning tube.

[0019] As described above, in the pipe leak repair device, the telescopic rod includes a first telescopic rod, a second telescopic rod, and a spring. The first telescopic rod has a first accommodating cavity opened along its axis, and the second telescopic rod has a second accommodating cavity opened along its axis. The first accommodating cavity has an opening at its first end and a closed tail end. The tail end of the first telescopic rod is inserted into the second accommodating cavity. The tail end of the first accommodating cavity has an opening and communicates with the second accommodating cavity. The first accommodating cavity has a closed head. The spring passes through the first accommodating cavity and the second accommodating cavity. One end of the spring is fixed to the first end of the first accommodating cavity, and the other end of the spring is fixed to the tail end of the second accommodating cavity. The inner wall of the first end of the second accommodating cavity is provided with a first limiting boss, and the outer wall of the tail end of the first telescopic rod is provided with a second limiting boss. The second limiting boss can be aligned and engaged with the first limiting boss.

[0020] As described above, in the pipeline leak repair device, the positioning tube has an axially extending guide cavity, and one end of the guide cavity protruding from the connecting end has an inclined liquid inlet. A piston and a piston rod are disposed inside the guide cavity. The piston is in a sealing sliding fit with the inner wall of the guide cavity. One end of the piston rod is fixedly connected to the piston, and the other end of the piston rod protrudes from the operating end.

[0021] Compared with the prior art, the present invention has the following features and advantages:

[0022] The pipe leak repair device proposed in this invention has a sealing gasket in a folded state and an unfolded state. When repairing a pipe leak, the sealing gasket and support rod in the folded state are first inserted into the leak. Then, the folding mechanism drives multiple support rods to unfold, which in turn drives the sealing gasket, which is fixedly connected to the support rods, to unfold. The unfolded sealing gasket can fit tightly against the inner wall of the pipe, thereby quickly sealing the pipe leak. At the same time, the positioning mechanism can extend along the axis of the support column and press against the inner wall of the pipe opposite to the leak to support the sealing gasket, further ensuring that the sealing gasket can seal the leak. Attached Figure Description

[0023] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0024] Figure 1 This is a schematic diagram showing the usage state of the pipeline leak repair device proposed in this invention;

[0025] Figure 2 This is a top view of the sealing gasket of the pipe leak repair device in this invention after it has been unfolded.

[0026] Figure 3 This is a schematic diagram of the pipe leak repair device in the present invention in its folded state;

[0027] Figure 4 This is a schematic diagram of the telescopic rod in this invention;

[0028] Figure 5 This is a schematic diagram of the positioning tube in this invention;

[0029] Figure 6 This is a schematic diagram of the folding mechanism in this invention;

[0030] Figure 7 This is a schematic diagram of the support column in this invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 10. Pipeline leak repair device; 20. Pipeline;

[0033] 100. Support column; 110. Connecting end;

[0034] 120. Operating end; 130. First mounting cavity;

[0035] 140. Bearing; 150. Limiting step;

[0036] 200. Sealing gasket; 210. Mounting groove;

[0037] 300. Support rod; 400. Folding mechanism;

[0038] 410. Rotating shaft; 411. Rotating handle;

[0039] 412. Second mounting cavity; 420. Movable block;

[0040] 430. Hinge; 431. Sliding block;

[0041] 432. Hinge rod;

[0042] 500. Positioning mechanism; 510. Positioning tube;

[0043] 511. Flow guide cavity; 512. Liquid inlet;

[0044] 520. Buffer assembly; 521. Fixing ring;

[0045] 522. Fixed pole; 523. Telescopic pole;

[0046] 5231. First telescopic pole; 5232. Second telescopic pole;

[0047] 5233, Spring; 5234, First limiting boss;

[0048] 5235, Second limiting boss; 530, Piston;

[0049] 540. Piston rod. Detailed Implementation

[0050] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, and these should all be considered to fall within the scope of the invention.

[0051] It should be noted that when a component is referred to as "fixed to" or "set on" another component, it can be directly on the other component or there may be an intervening component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0052] The directional terms “up,” “down,” “top,” and “bottom” used in this article are... Figure 1 As shown, these directional terms are only relative concepts or references to the normal use of the product, and should not be considered restrictive.

[0053] like Figures 1 to 7As shown, the pipe leak repair device 10 proposed in this invention includes a support column 100, a sealing gasket 200, multiple support rods 300, a folding mechanism 400, and a positioning mechanism 500. One end of the support column 100 is a connecting end 110, and the other end is an operating end 120. The sealing gasket 200 is annular and sleeved on the outside of the support column 100, and the inner edge of the sealing gasket 200 is sealed to the outer wall of the connecting end 110. Multiple support rods 300 are evenly distributed along the circumference of the support column 100, and one end of each support rod 300 is hinged to the outer wall of the support column 100. The other end of each support rod 300 is fixedly connected to the sealing gasket 200. The folding mechanism 400 is disposed between the support column 100 and the multiple support rods 300, and the multiple support rods 300 are extended and retracted radially along the support column 100 under the drive of the folding mechanism 400. The positioning mechanism 500 is installed on the connecting end 110, and the positioning mechanism 500 can extend and retract along the axis of the support column 100.

[0054] The pipe leak repair device 10 proposed in this invention has a sealing gasket 200 in a folded state and an unfolded state. When repairing a leak in pipe 20, the sealing gasket 200 in the folded state and the support rod 300 are first inserted into the leak in pipe 20. Then, the folding mechanism 400 drives multiple support rods 300 to unfold, which in turn drives the sealing gasket 200, which is fixedly connected to the support rods 300, to unfold. The unfolded sealing gasket 200 can fit tightly against the inner wall of the pipe, thereby quickly sealing the pipe leak. At the same time, the positioning mechanism 500 can extend along the axis of the support column 100 and press against the inner wall of pipe 20 opposite to the leak to support the sealing gasket 200, further ensuring that the sealing gasket 200 can fit tightly against the inner wall of the pipe to seal the leak.

[0055] In an optional embodiment of the present invention, the outer wall of the connecting end 110 protrudes radially outward along the support column 100 to form a limiting step 150, the support rod 300 is correspondingly hinged on the limiting step 150, and after the support rod 300 is unfolded, the inner edge of the sealing gasket 200 is sealed and engaged with the limiting step 150.

[0056] It should be noted that when the support rod 300 and the sealing gasket 200 are in the folded state, the inner edge of the sealing gasket 200 and the limiting step 150 can be sealed together or have a gap. However, when the support rod 300 and the sealing gasket 200 are in the unfolded state, the inner edge of the sealing gasket 200 and the limiting step 150 must be sealed together to prevent the liquid in the pipe 20 from leaking out from the inner edge of the sealing gasket 200.

[0057] In an optional example of this embodiment, the sealing gasket 200 has an installation groove 210 on the side facing the operating end 120, which is aligned with the support rod 300. The installation groove 210 is arranged radially along the support column 100. The support rod 300 passes through the installation groove 210 and is fixedly connected to the bottom surface of the installation groove 210. The outer diameter of the sealing gasket 200 is larger than the length of the installation groove 210 to ensure that the portion between the outer edge of the sealing gasket 200 and the installation groove 210 can seal against the inner wall of the pipe.

[0058] In an optional example, the gasket 200 is a rubber gasket to facilitate a sealing fit between the gasket 200 and the inner wall of the pipe 10.

[0059] In an optional embodiment of the present invention, the folding mechanism 400 includes a rotating shaft 410, a moving block 420, and a plurality of hinges 430. A first mounting cavity 130 is provided in the support column 100. The rotating shaft 410 is arranged along the axis of the support column 100 and is rotatably mounted in the first mounting cavity 130. The moving block 420 has an axially penetrating mounting hole. The moving block 420 is sleeved on the outside of the rotating shaft 410 and threadedly engaged with the rotating shaft 410. Each support rod 300 is connected to the moving block 420 through the hinge 430. A plurality of sliding grooves are provided on the side wall of the support column 100 to align with the support rods 300. The sliding grooves are opened parallel to the axis of the support column 100. One end of the hinge 430 passes through the sliding groove and is hinged to the moving block 420. The other end of the hinge 430 is hinged to the support rod 300. The hinge 430 can reciprocate along the sliding groove. With the above structure, the rotating shaft 410 can rotate the moving block 420 along the axial direction of the rotating shaft 410. The movement of the moving block 420 can drive the movement of the hinge 430, thereby driving the expansion and retraction of the support rod 300.

[0060] In an optional embodiment, the hinge 430 includes a sliding block 431 and a hinge rod 432. One end of the sliding block 431 is fixedly connected to a moving block 420, and the other end of the sliding block 431 passes through a slide groove and can reciprocate along the slide groove. One end of the hinge rod 432 is hinged to the other end of the sliding block 431, and the other end of the hinge rod 432 is hinged to the support rod 300. The sliding block 431 can reciprocate along the slide groove, which not only limits the movement of the sliding block 431 but also prevents the support column 100 from interfering with the movement of the hinge rod 432, ensuring the normal movement of the folding mechanism 400.

[0061] In an optional example, bearings 140 are respectively provided at both ends of the first mounting cavity 130, and the rotating shaft 410 is rotatably mounted in the first mounting cavity 130 via the two bearings 140. The outer wall of the bearing 140 is sealed to the inner wall of the first mounting cavity 130.

[0062] In an optional example, the rotating shaft 410 extends out of the first mounting cavity 130 at one end located at the operating end 120 and is fitted with a rotating handle 411. In use, the rotating shaft 410 is rotated by turning the handle 411, which is convenient and effortless.

[0063] In an optional embodiment of the present invention, the positioning mechanism 500 includes a positioning tube 510 and a buffer assembly 520. The rotating shaft 410 has a second mounting cavity 412 that extends axially. The positioning tube 510 passes through the second mounting cavity 412 and is threaded into the inner wall of the second mounting cavity 412. One end of the positioning tube 510 protrudes from the connecting end 110 and is fitted with the buffer assembly 520. With the above structure, rotating the positioning tube 510 can realize the extension and retraction of the positioning tube 510. When it is necessary to position the sealing gasket 200, rotating the positioning tube 510 causes the end of the positioning tube 510 protruding from the connecting end 110 to extend outward along the axis of the support column 100 and abut against the inner wall of the pipe 20. At this time, the end of the positioning tube 510 and the sealing gasket 200 are respectively located on two opposite inner walls of the pipe 20, and the sealing gasket 200 is subjected to a reverse force, thus making it fit more tightly against the inner wall of the pipe 20. The buffer assembly 520 ensures that the positioning tube 510 slowly contacts the inner wall of the pipe 20, thus preventing the positioning tube 510 from damaging the inner wall of the pipe 20.

[0064] In an optional embodiment, the buffer assembly 520 includes a fixing ring 521, a plurality of fixing rods 522, and a plurality of telescopic rods 523. The fixing ring 521 is sleeved on the outside of the positioning tube 510 and fixedly connected to the positioning tube 510. The plurality of fixing rods 522 are evenly distributed circumferentially along the fixing ring 521. One end of the fixing rod 522 is hinged to the fixing ring 521, and the other end of the fixing rod 522 faces away from the connecting end 110. Each fixing rod 522 is correspondingly connected to a telescopic rod 523. One end of the telescopic rod 523 is hinged to the side wall of the fixing rod 522, and the other end of the telescopic rod 523 is hinged to the outer wall of the positioning tube 510. In an optional embodiment, such as... Figure 1 As shown, the fixing rod 522 is inclined downward, and the bottom end of the fixing rod 522 protrudes from the bottom end of the positioning tube 510 to ensure that the fixing rod 522 contacts the inner wall of the pipe 20 first.

[0065] Furthermore, the telescopic rod 523 includes a first telescopic rod 5231, a second telescopic rod 5232, and a spring 5233. The first telescopic rod 5231 has a first accommodating cavity opened along its axis, and the second telescopic rod 5232 has a second accommodating cavity opened along its axis. The first end of the second accommodating cavity is open, and the tail end of the second accommodating cavity is closed. The tail end of the first telescopic rod 5231 is inserted into the second accommodating cavity. The first end of the first accommodating cavity is closed, and the tail end of the first accommodating cavity is open and communicates with the second accommodating cavity. The spring 5233... 233 is inserted into the first accommodating cavity and the second accommodating cavity, and one end of the spring 5233 is fixedly connected to the first end of the first accommodating cavity, and the other end of the spring 5233 is fixedly connected to the tail end of the second accommodating cavity. The inner wall of the first end of the second accommodating cavity is provided with a first limiting boss 5234, and the outer wall of the tail end of the first telescopic rod 5231 is provided with a second limiting boss 5235. The second limiting boss 5235 can be aligned and engaged with the first limiting boss 5234 to prevent the first telescopic rod 5231 and the second telescopic rod 5232 from separating.

[0066] In an optional embodiment, the positioning tube 510 has an axially extending guide cavity 511. One end of the guide cavity 511 protruding from the connecting end 110 has an inclined inlet 512. A piston 530 and a piston rod 540 are disposed within the guide cavity 511. The piston 530 is in a sealing sliding fit with the inner wall of the guide cavity 511. One end of the piston rod 540 is fixedly connected to the piston 530, and the other end of the piston rod 540 protrudes from the operating end 120 and extends outside the guide cavity 511. With this structure, by using the piston rod 540 to pull the piston 530, residual liquid in the pipe 20 can be drawn into the inner wall of the positioning tube 510 through the inlet 512, thereby easily cleaning the residual liquid inside the pipe.

[0067] In an optional example, the other end of the piston rod 540 is fitted with a handle to facilitate the extension and retraction of the piston rod 540.

[0068] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the various features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. A pipe leak repair device, characterized in that, The pipeline leak repairing device comprises: a support column, one end of which is a connecting end and the other end is an operating end; a sealing gasket, which is annular and sleeved on the outside of the support column, the inner edge of the sealing gasket being capable of sealingly cooperating with the outer wall of the connecting end; a plurality of support rods, which are uniformly distributed along the circumference of the support column, one end of each of the support rods being hingedly connected to the outer wall of the support column, and the other end of each of the support rods being fixedly connected to the sealing gasket; a folding mechanism, which is arranged between the support column and the plurality of support rods, the plurality of support rods being unfolded and retracted along the radial direction of the support column under the driving of the folding mechanism; a positioning mechanism, which is installed on the connecting end, the positioning mechanism being capable of extending and retracting along the axis of the support column; the folding mechanism comprising a rotating shaft, a moving block and a plurality of hinged elements, a first installation cavity being formed in the support column, the rotating shaft being arranged along the axis of the support column and being threadedly installed in the first installation cavity, the moving block having an axially-through installation hole, the moving block being sleeved on the outside of the rotating shaft and being threadedly cooperated with the rotating shaft, each of the support rods being connected to the moving block through the hinged element, a plurality of sliding grooves being formed in the side wall of the support column and being in alignment with the support rods, the sliding grooves being parallel to the axis of the support column, one end of the hinged element penetrating through the sliding groove and being hingedly connected to the moving block, the other end of the hinged element being hingedly connected to the support rod, the hinged element being capable of reciprocating along the sliding groove; the positioning mechanism comprising a positioning tube and a buffer assembly, a second installation cavity being formed in the rotating shaft and being axially-through, the positioning tube penetrating through the second installation cavity and being threadedly cooperated with the inner wall of the second installation cavity, one end of the positioning tube protruding from the connecting end and being installed with the buffer assembly; when the sealing gasket needs to be positioned, the positioning tube is rotated and one end of the positioning tube protruding from the connecting end is extended outwardly along the axis of the support column and abuts against the inner wall of the pipeline, the end of the positioning tube and the sealing gasket being respectively located on the two opposite inner walls of the pipeline, the sealing gasket being subjected to a reverse force and being closely attached to the inner wall of the pipeline; the positioning tube having an axially-through flow guide cavity, one end of the flow guide cavity protruding from the connecting end and having an obliquely arranged liquid inlet, a piston and a piston rod being arranged in the flow guide cavity, the piston being sealingly and slidingly cooperated with the inner wall of the flow guide cavity, one end of the piston rod being fixedly connected to the piston, the other end of the piston rod protruding from the operating end.

2. The apparatus of claim 1, wherein the outer wall of the connecting end being outwardly protruded along the radial direction of the support column to form a limiting step, the support rods being hingedly connected to the limiting step, and the inner edge of the sealing gasket being sealingly cooperated with the limiting step after the support rods are unfolded.

3. The apparatus of claim 2, wherein, one side of the sealing gasket facing the operating end being formed with an installation groove in alignment with the support rods, the installation groove being arranged along the radial direction of the support column, the support rods being arranged in the installation groove and being fixedly connected to the bottom surface of the installation groove, the outer diameter of the sealing gasket being greater than the length of the installation groove.

4. The apparatus of claim 1, wherein, The hinge comprises a sliding block and a hinge rod, one end of the sliding block is fixedly connected with the moving block, the other end of the sliding block penetrates through the sliding groove and is hingedly connected with one end of the hinge rod, and the other end of the hinge rod is hingedly connected with the support rod.

5. The apparatus of claim 1, wherein, Both ends of the first mounting cavity are provided with bearings, and the rotating shaft is rotatably mounted in the first mounting cavity through the two bearings.

6. The apparatus of claim 1, wherein, The buffer assembly comprises a fixing ring, a plurality of fixing rods and a plurality of telescopic rods, the fixing ring is sleeved outside the positioning pipe and fixedly connected with the positioning pipe, the fixing rods are uniformly distributed along the circumference of the fixing ring, one end of the fixing rod is hingedly connected with the fixing ring, and the other end of the fixing rod faces away from the connecting end, each fixing rod is connected with a telescopic rod, one end of the telescopic rod is hingedly connected with the side wall of the fixing rod, and the other end of the telescopic rod is hingedly connected with the outer wall of the positioning pipe.

7. The apparatus of claim 6, wherein, The telescopic rod comprises a first telescopic rod, a second telescopic rod and a spring, the first telescopic rod has a first accommodating cavity opened along an axis, the second telescopic rod has a second accommodating cavity opened along an axis, the first end of the second accommodating cavity has an opening, the tail end of the second accommodating cavity is closed, the tail end of the first telescopic rod is inserted into the second accommodating cavity, the tail end of the first accommodating cavity has an opening and is in communication with the second accommodating cavity, the first end of the first accommodating cavity is closed, the spring is arranged in the first accommodating cavity and the second accommodating cavity, one end of the spring is fixedly connected with the first end of the first accommodating cavity, the other end of the spring is fixedly connected with the tail end of the second accommodating cavity, the inner wall of the first end of the second accommodating cavity is provided with a first limiting boss, and the outer wall of the tail end of the first telescopic rod is provided with a second limiting boss which can be positioned and clamped on the first limiting boss.

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