JP4686697B2 - Lead removal equipment for caulking - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for removing caulking lead that scrapes off the caulking lead filled in the gap between the insertion port and the receiving port of the drain pipe joint.
[0002]
[Prior art]
As a method of joining drainage cast iron pipes until the Showa 40's, caulking joining by lead caulking has been frequently used, and when removing or renovating this kind of drainage cast iron pipes, it is necessary to remove lead for caulking at drainage joints. . This type of caulking joint is configured by filling yarn (hemp) as a back-up material in the gap between the drain pipe joints and pouring molten lead into this. For this reason, in the conventional lead removal operation for caulking, it is necessary to melt and remove at least lead, and the same equipment as acetylene welding is used.
That is, an oxygen cylinder and an acetylene cylinder are installed outdoors, a gas hose is drawn from each cylinder to the work place, and the joint is heated with a burner to melt the coking lead. Then, when lead is melted, the molten lead is removed by scraping it from the gap between the joints with a metal spatula or the like.
[0003]
[Problems to be solved by the invention]
In such conventional caulking lead removal work, whether a heavy gas cylinder is carried into the building or a gas hose is pulled from a gas cylinder installed outdoors to the work site, it is troublesome at the preparation stage. It was to take. In addition, in order to handle firearms, it is indispensable to prepare for safety considerations such as the qualification of dangerous goods handlers and fire-proof curing around drain pipes. Further, since the caulking lead removal operation itself requires skill from the relationship of handling firearms, and the lead is scraped out while blowing the drain pipe with a burner, there is a problem that the working time becomes long. Moreover, a curing time for cooling after the work is also required.
[0004]
An object of the present invention is to provide a caulking lead removing apparatus that can remove caulking lead in a drain pipe joint portion safely and easily with simple equipment in a short time.
[0005]
[Means for Solving the Problems]
The apparatus for removing caulking lead according to the present invention is a caulking lead removing apparatus that scrapes off the caulking lead filled in the gap between the insertion port and the receiving port of the drain pipe joint, and surrounds the drain pipe above the drain pipe joint. A fixed member fixed in such a manner, a movable member provided rotatably at a lower portion of the fixed member, and a lead cutter provided so as to protrude downward from the movable member and scraping off lead for coking, and a lower portion of the fixed member; A screw mechanism that rotates coaxially with the drain pipe is formed between the movable member and the movable member.
[0006]
According to this configuration, when the movable member is rotated with respect to the fixed member fixed to the drain pipe, the movable member is gradually lowered by the screw mechanism formed between them. At that time, the lead cutter protruding from the movable member is cut into the lead for caulking while rotating around the axis of the drain pipe. That is, the lead for coking can be scraped off by the lead cutter that moves in accordance with the screw pair of the screw mechanism.
[0007]
In this case, the fixing member is composed of a fixing member main body provided so as to surround the drain pipe, and four tightening screws arranged uniformly in the circumferential direction of the fixing member main body. It is preferable that the fixing member main body is penetrated in the radial direction and screwed to relatively hold and fix the drain pipe.
[0008]
According to this configuration, the four tightening screws tightened between the fixing member main body and the drain pipe to relatively fix the fixing member to the drain pipe. At this time, since the four tightening screws are threaded through the fixing member in the radial direction, the drain pipe is sandwiched from four directions. For this reason, it is possible to fix the fixing member main body coaxially with the drainage pipe by adjusting the tightening of the four fastening screws, and remove this even if there are irregularities on the outer peripheral surface of the drainage pipe. A clamping screw can be arranged.
[0009]
In these cases, it is preferable that the upper part of the inner peripheral surface of the fixing member is widened.
[0010]
According to this configuration, in particular, when a fixing member is attached to a drainage pipe joint (drainage pipe), even if the fixing position is applied to the lower end part of the joint receiving port or the lower end part of the branch part, You can escape this. Accordingly, the fixing member can be appropriately installed (fixed) so as to be coaxial with the drain pipe.
[0011]
In these cases, it is preferable that the screw mechanism includes a male screw portion formed on the upper portion of the movable member and a female screw portion formed on the fixed member and screwed into the male screw portion.
[0012]
According to this structure, since the movable member in which the external thread is formed is located inside the internal thread portion of the fixed member, it can be formed to have a small diameter so as to be as close to the drain pipe as possible. For this reason, the movable member can be rotated around the axis line at a position close to the outer peripheral surface of the drain pipe, and the lead cutter provided on the movable member is directly above the gap between the insertion port and the receiving port without being deformed inward. Can be rotated. Therefore, the caulking lead can be appropriately scraped without sacrificing the strength of the lead cutter. In consideration of the distance between the lead cutter and the caulking lead, the fixing member can be positioned and fixed to the drain pipe in a state where the female screw portion formed on the fixing member and the male screw portion formed on the movable member are screwed together. ,preferable.
[0013]
In these cases, the lead cutter preferably has an annular cutter holder fixed to the lower portion of the movable member, and a cutter body extending downward from the cutter holder and integrally formed with the cutter holder.
[0014]
According to this configuration, since the cutter holder and the cutter body are integrally formed, the rigidity of the entire lead cutter can be increased, and damage such as deformation of the cutter body and chipping from the base can be effectively prevented. it can. Even when the cutter body has a plurality of cutting blade portions, the entire lead cutter can be easily mounted or replaced.
[0015]
In this case, it is preferable that the cutter body is composed of a plurality of cutting blade portions that are evenly arranged in the circumferential direction.
[0016]
The cutting depth of the cutter body into the caulking lead with respect to one rotation of the movable member is the same as the screw pitch of the screw mechanism. According to this configuration, since the cutter body is composed of a plurality of cutting blade portions that are uniformly arranged in the circumferential direction, the cutting resistance can be uniformly distributed in the circumferential direction of the cutter body, This makes it possible to cut smoothly and smoothly. Moreover, the cutting depth and cutting resistance of one cutting edge part can be made small, the chip | tip which can be taken out easily can be obtained, and the cutting load which each cutting edge part receives can be made small.
[0017]
In this case, it is preferable that the rake face of each cutting edge portion is inclined outward.
[0018]
According to this configuration, the scraped pieces of caulking lead that have been cut off can be discharged outwardly from the drain pipe joint by the inclination of each cutting edge portion rake face to the outside. For this reason, it is possible to prevent clogging of lead cutting chips for caulking in the drain pipe joint, and to reduce the rotational load of the lead cutter by cutting chips as much as possible.
[0019]
In these cases, the fixed member and the movable member are formed in half, and the joint portion on the half piece periphery of the fixed member and the joint portion on the half piece periphery of the movable member are respectively between the half pieces. It is preferable that a reinforcing pin extending in the tangential direction is embedded.
[0020]
According to this configuration, the reinforcing pins provided on the fixed member and the movable member can appropriately align the joint portion between the half pieces of the fixed member and the joint portion between the half pieces of the movable member. Further, since the reinforcing pins are provided in a tangential direction between the half pieces of the fixed member and between the half pieces of the movable member, the rigidity (integration) of the fixed member and the movable member can be increased. It is possible to effectively prevent deformation of the fixed member and the movable member during the cutting operation. For this reason, the screw mechanism provided between the lower part of the fixed member and the movable member can function appropriately.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a lead removing apparatus for coking according to an embodiment of the present invention will be described with reference to the accompanying drawings. The lead removing device for caulking removes coking lead from a caulking joint portion of a so-called drainage cast iron pipe joined by lead caulking. In this embodiment, in the renovation work around the water fountain in a newly built apartment building in the Showa 40s, the joint of the vertical drainage pipe (TY pipe) that connects the sewage drainage is rotated 90 ° with the transfer of the toilet. (The drainage pipe is not replaced). In addition, instead of lead coking, resin caulking is performed on the joint portion of the drainage joint after rotation.
[0022]
FIG. 1 is a general view showing a state in which a caulking lead removing device is mounted on an existing drainage vertical pipe (drainage pipe). The drainage vertical pipe (existing drainage pipe) P of the embodiment has a nominal diameter of 75 mm, and the removal device 1 is somewhat larger than the outer diameter of the drainage vertical pipe P, and the main part is formed in an annular shape. In this case, the removing device 1 is for caulking of two pipe joints Pa between a drainage pipe joint (TY pipe) P2 for connecting the toilet of the drainage vertical pipe P and the upper and lower straight pipes P1. Lead A is removed, but the removal device 1 in the figure is directly above the insertion port Pb of the straight pipe P1 in order to remove the lead A for caulking at the pipe joint Pa of the upper straight pipe P1 and the drain pipe joint P2. It is fixed to.
[0023]
The removal device 1 includes a fixed member 2 fixed so as to surround the drainage vertical pipe (straight pipe P1) P on the upper side of the pipe joint Pa, a movable member 3 rotatably mounted on the inner peripheral surface of the fixed member 2, The lead cutter 4 is fixed to the lower part of the movable member 3 and scrapes off the caulking lead A filled in the gap between the insertion port Pb of the straight pipe P1 and the receiving port Pc of the drainage pipe joint P2. Further, in order to form a screw mechanism 5 between the fixed member 2 and the movable member 3, a female thread portion 6 is formed on the lower inner peripheral surface of the fixed member 2, and the upper outer peripheral surface of the movable member 3 A male screw portion 7 that is screwed into the female screw portion 6 is formed.
[0024]
When removing the lead A for caulking, when the movable member 3 is rotated with respect to the fixed member 2 by the screw mechanism 5 configured between the fixed member 2 and the movable member 3, the movable member 3 is It gradually descends while rotating around the axis of the drainage vertical pipe P. The lead cutter 4 fixed to the lower part of the movable member 4 scrapes off the caulking lead A while rotating around the axis of the drainage vertical pipe P by the screw pair of the screw mechanism 5. That is, the lead A for caulking of one pitch of the screw mechanism 5 is cut for one rotation of the movable member 4. Then, the caulking lead A is deeply cut by the plurality of rotations of the movable member, and finally the caulking lead A is divided into the insertion port Pb side and the receiving port Pc side. In addition, the code | symbol B in a figure is the yarn used as the backup material of the lead A for coking.
[0025]
As shown in FIG. 2, the fixing member 2 has a main portion formed in an annular shape, and is attached to the fixing member main body 11 that is mounted so as to be surrounded by the straight pipe (drainage vertical pipe P) P <b> 1, and the fixing member main body 11. There are four fixing screws 12 which are screwed from four sides and fixed to a straight pipe. The fixing member main body 11 is formed in an annular shape, and in addition to a flange-shaped joining piece 17 to be described later, an expanded portion 13 is formed on the upper inner peripheral surface, and the female screw portion 6 is formed on the lower inner peripheral surface. Each is integrally formed. The female screw portion 6 occupies 2/3 of the lower portion of the fixing member main body 11, while the expanded portion 13 occupies one third of the upper portion of the fixing member main body 11 and passes through the stepped portion. It is more widely expanded once.
[0026]
The four fixing screws 12 are evenly arranged in the circumferential direction of the fixing member main body 11 and screwed so as to penetrate horizontally and radially toward the expanding portion 13 of the fixing member main body 11. . That is, the fixing member main body 11 is formed with screw holes 14 for screwing the fixing screws 12 at four locations in the circumferential direction. The fixing member 2 is fixed to the straight pipe P1 so that the straight pipe P1 is clamped from four directions by four fixing screws 12 screwed so as to penetrate the fixing member main body 11. The fixing screws 12 are tightened so that the gap between the inner peripheral surface of the fixing member main body 11 and the outer peripheral surface of the drainage vertical pipe (straight pipe P1) P has a uniform width in the circumferential direction. The adjustment is performed so as to be arranged coaxially with the straight pipe P1.
[0027]
When characters such as a pipe diameter project from the surface of the straight pipe P1, the fixing screws 14 are shifted in the circumferential direction so as to be separated from the characters. Further, when the fixing member 2 is fixed to the drainage pipe joint P2 (the above-mentioned another joint portion), the fixing position of the fixing member 2 is the lower end of the receiving port Pc of the drainage pipe joint P2 or the lower end of the branching part. Even if it hits a part, it is made to escape with the said expansion part 13. FIG. Thereby, the fixing member 2 can be fixed horizontally and coaxially with the straight pipe P1 without tilting.
[0028]
On the other hand, the fixing member (fixing member main body 11) 2 has a half structure, and the pair of half pieces (half pieces) 16 and 16 joined to each other are 180-degree symmetrical. . Each half piece 16 is formed with a pair of flange-like joining pieces 17, 17 extending radially outward from both ends in the circumferential direction. That is, each half piece 16 is integrally formed of an annular portion 18 that is the main body of the fixing member main body 11 and a pair of joining pieces 17 and 17 that extend from both ends of the annular portion 18. Both halved pieces 16 and 16 abut each other's joining pieces 17 and are fixed by two connecting bolts 19 and 19 respectively. For this reason, one joining piece 17a of each half piece 16 is formed with two upper and lower through holes 20 and 20 through which the connecting bolt 19 passes, and the other joining piece 17b is screwed with the connecting bolt 19. Upper and lower screw holes 21 and 21 are formed.
[0029]
A reinforcing pin 22 is embedded in one end of the annular portion 18 adjacent to the two through holes 20, 20, and the other end of the annular portion 18 is adjacent to the two screw holes 21, 21. A positioning hole 23 through which the reinforcing pin 22 is inserted is formed at the end of the. The reinforcing pin 22 and the positioning hole 23 extend in the tangential direction, and the reinforcing pin 22 embedded so as to be press-fitted into the one joining piece 17a facing each other has a predetermined size in the positioning hole 23 of the other joining piece 17b. It is designed to fit with tolerance. That is, one half of the reinforcing pin 22 is embedded in one joining piece 17 a and the other half is inserted into the positioning hole 23.
[0030]
In this way, the two half pieces 16, 16 are abutted against each other while being positioned by the reinforcing pins 22, and are fixed by the connecting bolts 19. In this case, since the reinforcing pins 22 extending in the tangential direction are inserted into the joint portions between the half pieces 16, not only the half pieces 16 are positioned but also fixed by the rotational load accompanying the cutting operation. Deformation (distortion) in the joint portion of the member 2 can be effectively prevented. In addition, since the fixing member main body 11 has a halved structure, the female thread portion 6 also constitutes the female thread in a state where both the halved pieces 16 and 16 are joined. Further, two of the four fixing screws 12 are provided on each half piece 16.
[0031]
Similarly, as shown in FIG. 3, the movable member 3 includes a movable member main body 31 that surrounds the straight pipe (drainage vertical pipe P) P <b> 1 with a slight gap and is screwed to the fixed member 2, and a movable member. Four rotating handles 32 attached to the main body 31 are provided. The main part of the movable member 31 is formed in an annular shape, and in addition to a handle mounting portion 37 described later, a cylindrical male screw portion 7 having a male screw 7a formed on the outer peripheral surface is formed on the upper portion thereof, and a lower inner peripheral surface. The cutter mounting portions 34 are integrally formed. The male screw portion 7 occupies 2/3 of the upper portion of the movable member main body 31, while the cutter mounting portion 34 occupies 1/3 of the lower portion of the movable member main body 31.
[0032]
An annular convex portion 35 is formed between the inner peripheral surface of the male screw portion 7 and the cutter mounting portion 34, and the upper and lower mounting positions of the lead cutter 4 are regulated by the convex portion 35. The lead cutter 4 is fixed downward to the cutter mounting portion 34 in a state of surrounding the straight pipe P1 by a plurality of small screws 36 screwed into the cutter mounting portion 34 from the inside.
[0033]
The movable member main body 31 is formed with four handle attachment portions 37 extending radially outward from the outer peripheral surface. The four handle attachment portions 37 extend horizontally from the lower side of the male screw portion 7 in four directions, and a square fitting hole 38 is formed at the tip of each handle attachment portion 37. On the other hand, each rotary handle 32 is formed in a lateral “L” shape by the grip portion 40 and the mounting portion 41, and a fitting convex portion 42 that fits into the fitting hole 38 is formed below the mounting portion 41. Is formed. That is, the rotary handle 32 is fitted into the handle attachment portion 37 by a small screw 43 that is fitted in the fitting hole 38 of the handle attachment portion 37 with the fitting convex portion 42 and is horizontally screwed toward the fitting hole 38. It is detachably fixed.
[0034]
Note that two rotation handles 32 may be provided at symmetrical positions. Moreover, it is preferable that the tip position of the rotary handle 32 is within 230 mm from the axial center of the drainage vertical pipe P. Thereby, when operating the rotary handle 32, it is possible to prevent the rotary handle 32 from interfering with other adjacent vertical pipes (including water supply vertical pipes) and wall surfaces. This is because the work space at the time of new installation has an interval of about 300 mm to 350 mm between adjacent vertical pipes and wall surfaces.
[0035]
Similar to the fixed member 2, the movable member (movable member main body 31) 3 has a half-split structure, and a pair of half-split pieces (half-split pieces) 45 and 45 joined to each other are 180 ° points. It is symmetric. Each half piece 45 is formed with a pair of joining pieces 46 that extend radially outward from both ends in the circumferential direction and also serve as a half part of the handle mounting portion 37. That is, each half piece 45 is integrally formed by an annular portion 47 that forms the main body of the movable member main body 31, one handle mounting portion 37, and a pair of joining pieces 46, 46 extending from both ends of the annular portion 47. Has been.
[0036]
Both halved pieces 45, 45 abut each other's joining pieces 46, and are each fixed by one connecting bolt 48. Therefore, a through hole 49 through which the connecting bolt 48 passes is formed in one joining piece 46a of each half piece 45, and a screw hole 50 into which the connecting bolt 48 is screwed is formed in the other joining piece 46b. Has been. Further, one joining piece 46a is constituted by a vertically divided portion 37a of the handle mounting portion 37 and a fitting hole peripheral portion 37b, and the other joining piece 46b correspondingly is a vertically divided portion of the handle attaching portion 37. 37a. Therefore, when the joining pieces 46 are brought into contact with each other, a pair of left and right handle attachment portions 37, 37 are formed in this portion.
[0037]
Further, like the fixing member 2, a reinforcing pin 51 is embedded in one end portion of the annular portion 47 adjacent to the through hole 49, and the other end portion of the annular portion 47 adjacent to the screw hole 50. A positioning hole 52 through which the reinforcing pin 51 is inserted is formed. The reinforcing pin 51 and the positioning hole 52 extend in the tangential direction, and the reinforcing pin 51 embedded so as to be press-fitted into the one joining piece 46a facing each other has a predetermined size in the positioning hole 52 of the other joining piece 46b. It is designed to fit with tolerance. That is, one half of the reinforcing pin 51 is embedded in one joining piece 46 a and the other half is inserted into the positioning hole 52.
[0038]
Thus, the two half pieces 45, 45 are abutted with each other in a state of being positioned by the reinforcing pin 51, and are fixed by the connecting bolt 48. Also in this case, the reinforcing pins 51 extending in the tangential direction are inserted into the joint portions of the half pieces 45, so that the half pieces 45 are not only positioned but also due to a rotational load accompanying the cutting operation. Deformation (distortion) at the joint portion of the movable member 3 can be effectively prevented. Since the movable member main body 31 has a half structure, the outer peripheral surface of the male screw portion 7 (the male screw 7a) also forms a male screw with both the half pieces 45 joined.
[0039]
As shown in FIG. 4, the lead cutter 4 is formed integrally with a cutter holder 61 fixed to the cutter mounting portion 34 of the movable member 3 and a cutter body 62 extending downward from the cutter holder 61, and the cutter body 62. Consists of a plurality of cutting edge portions (details will be described later) 63. Corresponding to the movable member 3 having a half-split structure, the lead cutter 4 is composed of a pair of cutter pieces 4a, 4a on a semicircular arc having the same structure. The cutter holder 61 is formed in an annular shape as a whole, and has a plurality (six) fool holes 64 with counterbore holes through which the machine screws 36 are inserted.
[0040]
The cutter main body 62 is composed of twelve cutting blade portions 63 that are equally disposed in the circumferential direction. Each cutting edge part 63 is extended downward from the inner half part of the cutter holder 61, and the blade part 65 formed at the lower end part is formed slightly wide. Moreover, the blade part 65 of each cutting blade part 63 protrudes toward the rotation direction. In this case, in consideration of the caulking lead A to be cut, the blade portion 65 has a blade edge 65a that is a slant blade, and a rake face 65b that is a blade surface is inclined outward. Further, the clearance angle (blade back) is made small to suppress the biting of the blade portion 65.
[0041]
Thereby, while being able to cut smoothly, the shavings of the cutting lead A for caulking can be discharged | emitted to the outer side of the pipe junction part Pa. For this reason, at the time of the cutting operation of the lead A for coking, lead chips can be prevented from clogging in the pipe joint Pa, and the rotational load of the lead cutter 4 due to the chips can be reduced.
[0042]
In addition, the lead cutter 4 configured in this manner is formed integrally with the cutter holder 61 and the cutter body 62, so that the rigidity of the lead cutter 4 as a whole is increased and the mounting and replacement to the movable member 4 are easy. can do. Furthermore, since the cutter main body 62 is composed of a plurality of cutting blade portions 63, it is possible to reduce cutting resistance when cutting the lead A for caulking, and to obtain chips that can be easily taken out. The cutting load received by the cutting edge portion 63 can be reduced.
[0043]
Further, since the lead cutter 4 can be rotated immediately above the gap between the insertion port Pb and the receiving port Pc of the pipe joint portion Pa, the lead A for caulking is appropriately used without sacrificing the strength of the lead cutter 4. Can be scraped off. The lead cutter 4 divides the caulking lead A into a portion adhering to the insertion port Pb and a portion adhering to the receiving port Pa, and the yarn B remains as it is.
[0044]
In this embodiment, after removing the caulking lead A in the upper and lower pipe joints Pa across the drainage pipe joint P2, the drainage pipe joint P2 is rotated to a desired angle, and then the upper and lower pipe joints. Resin coking is applied to Pa. In this case, the work can be continuously performed without the need to cool the pipe joint portion Pa as in the conventional case using a firearm.
[0045]
The cutting operation is preferably performed while injecting the lubricant into each cutting edge portion 63. Specifically, the lubricant is injected from the gap between the drainage vertical pipe P and the external thread portion 7 of the movable member 3. Further, when a sufficient fixing space cannot be taken in the vertical direction as in the case where the removing device 1 is fixed to the drainage pipe joint P2, cutting is performed halfway with a short lead cutter 4 in advance, and a normal lead cutter is used. Change to 4 to proceed with cutting.
[0046]
【The invention's effect】
As described above, according to the lead removing device for caulking of the present invention, the drainage is achieved by lowering the lead cutter while rotating the lead cutter by the screw mechanism configured between the fixed member fixed to the drain pipe and the movable member. Lead for caulking at pipe joints can be scraped off. Therefore, the lead for coking can be removed safely and in a short time with simple equipment. Further, the caulking lead can be safely removed without requiring the use of firearms, and noise problems do not occur during work.
[Brief description of the drawings]
FIG. 1 is a half sectional view of a state in which a caulking lead removing apparatus according to an embodiment of the present invention is mounted on a drainage vertical pipe.
FIG. 2 is a structural diagram of a fixing member in the removing device of the embodiment.
FIG. 3 is a structural diagram of a movable member in the removing device of the embodiment.
FIG. 4 is a structural view around a lead cutter in the removing apparatus of the embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Removal apparatus 2 Fixed member 3 Movable member 4 Lead cutter 5 Screw mechanism 6 Female screw part 7 Male screw part 11 Fixed member main body 12 Fixed screw 13 Widening part 16 Half piece 22 Reinforcement pin 23 Positioning hole 31 Movable member main body 32 Rotating handle 45 Half-piece 51 Reinforcement pin 52 Positioning hole 61 Cutter holder 62 Cutter body 63 Cutting blade part 65 Blade part 65a Rake face P Drainage pipe Pa Pipe joint Pb Insertion port Pc Receptor A Lead for caulking

Claims (8)

In the caulking lead removal device that scrapes off the caulking lead filled in the gap between the outlet and the receiving port of the drain pipe joint,
A fixing member fixed to surround the drain pipe on the upper side of the drain pipe joint,
A movable member rotatably provided at a lower portion of the fixed member;
A lead cutter provided so as to protrude downward from the movable member, and scraping off the lead for coking.
A caulking lead removing apparatus, wherein a screw mechanism rotating coaxially with the drain pipe is formed between a lower portion of the fixed member and the movable member. The fixing member includes a fixing member body provided to surround the drain pipe,
It is composed of four fastening screws that are evenly arranged in the circumferential direction of the fixing member body,
The removal of caulking lead according to claim 1, wherein each of the four tightening screws penetrates the fixing member body in a radial direction and is screwed together to relatively clamp and fix the drain pipe. apparatus. The apparatus for removing lead for coking according to claim 1 or 2, wherein the inner peripheral surface of the fixing member is formed to have an enlarged upper portion. The screw mechanism includes a male screw portion formed on the movable member,
4. The apparatus for removing lead for caulking according to claim 1, wherein the device is composed of a female screw part formed on the fixing member and screwed into the male screw part. The lead cutter is an annular cutter holder fixed to the lower part of the movable member;
5. The apparatus for removing lead for coking according to claim 1, further comprising a cutter main body extending downward from the cutter holder and integrally formed with the cutter holder. 6. The apparatus for removing lead for caulking according to claim 5, wherein the cutter body is composed of a plurality of cutting blade portions that are equally disposed in the circumferential direction. 7. The apparatus for removing lead for coking according to claim 6, wherein the rake face of each of the cutting blade portions is inclined outward. The fixed member and the movable member are formed in a half structure,
Reinforcing pins extending in the tangential direction between the half pieces are embedded in the joint part on the circumference of the half piece of the fixed member and the joint part on the circumference of the half piece of the movable member. 8. The apparatus for removing lead for coking according to any one of claims 1 to 7.

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