KR20140021845A - Pipe connecting apparatus of one-touch type - Google Patents

Pipe connecting apparatus of one-touch type Download PDF

Info

Publication number
KR20140021845A
KR20140021845A KR1020120088124A KR20120088124A KR20140021845A KR 20140021845 A KR20140021845 A KR 20140021845A KR 1020120088124 A KR1020120088124 A KR 1020120088124A KR 20120088124 A KR20120088124 A KR 20120088124A KR 20140021845 A KR20140021845 A KR 20140021845A
Authority
KR
South Korea
Prior art keywords
synthetic resin
resin body
pipe
release member
connection device
Prior art date
Application number
KR1020120088124A
Other languages
Korean (ko)
Inventor
김성훈
Original Assignee
주식회사 워터테이크
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 워터테이크 filed Critical 주식회사 워터테이크
Priority to KR1020120088124A priority Critical patent/KR20140021845A/en
Priority to CN2012800012012A priority patent/CN103282714A/en
Priority to EP12772185.0A priority patent/EP2589848A4/en
Priority to PCT/KR2012/006961 priority patent/WO2013032254A2/en
Priority to AU2012244266A priority patent/AU2012244266A1/en
Priority to JP2013531519A priority patent/JP5438869B2/en
Priority to CA2788519A priority patent/CA2788519A1/en
Publication of KR20140021845A publication Critical patent/KR20140021845A/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/007—Joints with sleeve or socket clamped by a wedging action
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/086—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of latching members pushed radially by spring-like elements

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)

Abstract

The present invention relates to a one-touch pipe connection device, which is to ensure a convenient assembly process while being able to easily perform the connection between the pipes and excellent water tightness, fixing force, durability. To this end, the present invention, the synthetic resin body 10 is inserted into the pipe (1), the rubber packing 20 to ensure the water tightness is disposed opposite to the center of the synthetic resin body 10, the synthetic resin body 10 A part is inserted into the release member 30 is moved to the outside by the pressure spring (30-1), and the contact member 40 is installed in the release member 30 when the movement is in close contact with the outer peripheral surface of the pipe (1) Characterized in that consists of.

Description

[0001] PIPE CONNECTING APPARATUS OF ONE-TOUCH TYPE [0002]

The present invention relates to a pipe connecting device, and more particularly, to a one-touch pipe connecting device that can easily perform a connection between pipes, while ensuring excellent watertightness, fixing force, durability, and a convenient assembly process.

In general, in order to guide the fluid in a certain path, pipes and pipe fittings of various sizes and shapes are used, and a welding method showing excellent durability and watertightness for the connection part is mainly used as a connection method according to a combination thereof.

By the way, the welding method as described above is required to secure a certain space in the welding work for connecting the pipes, and there is a problem that the repair work is very inconvenient in the event of a defect even after the joint between the pipes due to welding, for example between the pipes If the connection is made through the welding method, it is necessary to secure the working space due to the welding part to be made along the outer circumference of the pipe. Or reinstallation, there is a problem that it is very difficult to separate and reinstall the pressure wheel between the pipes, and when connecting pipes of different sizes according to the flange, welded joint, etc., expensive pipe joints must be separately provided. Republic of Korea Patent No. 10-0899461 (hereinafter referred to as 'registered patent 1' ) And Patent Registration No. 10-0927198 has invented a bar No. (hereinafter referred to as "Patent 2").

By the way, the pipe connecting device of the Patents 1 and 2 is fixed to the pipe by the tightening of the bolts exposed to the outside, when the impact is applied to the bolts when the loosening occurs, the watertightness and fixing force in the connection between the pipes On the other hand, as the process is cumbersome and time-consuming as the process of firmly joining a plurality of bolts is essential, the present applicant has registered Korean Patent No. 10-0977308 (hereinafter referred to as' Patent 3). ') To overcome such problems, but there is still a need for research in various aspects, such as ensuring excellent watertightness, durability, shortening of the assembly process.

The present invention has been made to solve the problems of the prior art, to provide a one-touch pipe connecting device having a structure for ensuring a stable watertightness, durability, simplifying the assembly process, while being able to easily perform the connection between the pipes. The purpose is.

In order to achieve the above object, the present invention, the fitting portion which the pipe is fitted in both directions from the center, extending integrally from the fitting portion and the stepped groove, straight section and the inner diameter is extended from the outside along the pipe insertion direction Synthetic resin body consisting of an expansion unit is provided with a slope sequentially; A rubber packing having a ring portion disposed in a fixing groove formed between the fitting portion and the expansion portion of the synthetic resin body, and a wing portion integrally extending from the ring portion toward the central portion of the synthetic resin body to be inclined along the outer circumferential surface of the synthetic resin body; A cylindrical release member having a protruding rib at an outer end thereof to enable a pressing spring to be disposed between the stepped groove and the protruding rib of the synthetic resin body and a part of which is inserted into the synthetic resin body; The contact member is installed at a predetermined interval on the side of the release member located on the inclined surface of the synthetic resin body and the teeth are provided, when the pipe is inserted into the synthetic resin body, the contact member is in close contact with the tooth by the restoring force of the pressure spring; It is characterized by.

As described above, the one-touch pipe connecting device according to the present invention enables a solid connection between pipes by a simple process of inserting pipes, and also provides stable water tightness over a long period of time, excellent durability at high pressure, and shortening the assembly process time. As a result, it is possible to reduce leakage accidents while significantly shortening the piping construction and maintenance work period, and to be applicable to both low pressure general pipes and high pressure fire pipes.

In addition, since the body part is made of plastic synthetic resin and only the part where the greatest stress is concentrated can be replaced with metal material or reinforced plastic, it is possible to mass-produce high-performance products at low cost of materials.

1 is a perspective view showing an embodiment of a one-touch piping connection device according to the present invention.
2 is a cross-sectional view showing an embodiment of a one-touch piping connection device according to the present invention.
Figure 3 is a perspective view showing a reinforcing member of the snap ring shape used after injection molding the resin body.
Figure 4 is a cross-sectional view showing a ring-shaped reinforcement member is inserted into the mold when the resin body injection.
Figure 5 is a cross-sectional view showing an embodiment of a one-touch piping connection device according to the present invention is installed a reinforcing member of the snap ring shape.
Figure 6 is a cross-sectional view showing an embodiment of a one-touch piping connection device according to the present invention is installed ring-shaped reinforcement member is inserted into the mold.

Hereinafter, a one-touch pipe connecting apparatus according to the present invention will be described with reference to the drawings.

1 and 2 is a view showing a one-touch piping connection device according to the present invention.

The one-touch piping connection device according to the present invention is basically a synthetic resin body 10 is inserted into the pipe (1), the rubber packing 20 for ensuring the watertightness is arranged opposite to the center of the synthetic resin body (10) and A part is inserted into the synthetic resin body 10 and is released to the release member 30 and moved to the outside by the pressure spring 30-1, and is installed on the release member 30 and fixed to the outer peripheral surface of the pipe (1) during its movement It consists of a close contact member 40.

The synthetic resin body 10 has a fitting portion 11 in which the pipe 1 is fitted in both directions from the center, and integrally extends from the fitting portion 11 and is stepped in an inner circumferential surface from the outside along the insertion direction of the pipe 1. 12-1, the straight section 12-2, and the inclined surface 12-3 in which the inner diameter is expanded are comprised of the expansion part 12 provided in sequence.

The synthetic resin body 10 is basically injected into a mold, wherein the inclined surface 12-3 may be formed according to the structure of the mold core, but the fitting part 11 for installing the rubber packing 20 after injection is formed. It may be formed through a separate processing process together with the fixing grooves 10-1 between the expansion portions 12, and the strength of the synthetic resin material itself as it is manufactured in an integral cylindrical shape without coupling parts such as tightening affecting physical properties. Can be maintained as is and the product assembly process will be shortened.

The structure of the above-described synthetic resin body 10 is not limited to a straight line as shown in the drawing, but also an elbow type, a T-type, a branched type (a shape in which a plurality of piping can be additionally installed on both sides in a straight line) And the like.

The rubber packing 20 installed on the synthetic resin body 10 has a ring portion 21 disposed in a fixing groove 10-1 formed between the fitting portion 11 and the expansion portion 12 of the synthetic resin body 10. And a wing portion 22 which is integrally extended from the ring portion 21 toward the center of the synthetic resin body 10 to be in close contact with the outer circumferential surface of the pipe 1, and the ring portion 21 has a fixing groove 10-1. Inserted into the pipe seal 20 while maintaining the state that the rubber packing 20 is not separated from the synthetic resin body 10, the bent portion 22 is bent in the same direction when the pipe 1 is inserted so that the piping 1 and the synthetic resin body 10 The ring portion 21 and the wing portion 22 are prevented from leaking when the water is inserted between the gaps between the ring portions 21 and the wing portions 22 when the hydraulic pressure acts in the direction away from the pipe 1, thereby ensuring watertightness in the pipe-to-pipe connection for fluid transfer.

According to the structure of the rubber packing 20 as described above, the ring portion 21 prevents the leakage of water from the pipe toward the fixing groove 10-1 side and the wing portion 22 of the water in the space between the pipe and the rubber packing 20. While preventing leakage, the wing portion 22 has a wide range of movement that can be moved elastically soften the pipe (1) insertion than the conventional O-ring type packing and provides better water tightness even in vibration.

The release member 30 has a cylindrical shape that is basically perforated therein, and includes a protruding rib 31 at an outer end thereof, and between the protruding rib 31 and the stepped groove 12-1 of the synthetic resin body 10. Since the pressure spring 30-1 is disposed at the pressure spring 30-1, the moving space of the release member 30 is also utilized as a space for the pressure spring 30-1. (10) It is possible to reduce the overall length of the pipe connecting device according to the present invention than when disposed inside.

The contact member 40 is installed at regular intervals on the side of the release member 30 located on the inclined surface 12-3 of the synthetic resin body 10 and the teeth 41 are provided so that the pipe 1 is the synthetic resin body 10. In the case of being inserted into the), the release member 30 is moved outward by the restoring force of the pressure spring 30-1, so that the teeth 41 pressurizes the outer circumferential surface of the pipe 1, thereby enabling inter-pipe fixing.

Here, the release member 30 is provided with a fitting hole 33 into which the contact member 40 is inserted, and the contact member 40 is supported by the inclined surface 31 such that the teeth 41 closely contact the outer peripheral surface of the pipe 1. When the pipe 1 is inserted into the synthetic resin body 10, the teeth 41 protruding from the fitting hole 33 toward the pipe 1 are closely contacted with the pipe 10. In the state, the release member 30 moves toward the center of the synthetic resin body 10, and then the contact member 40 moves to the space between the inclined surfaces 12-3 at a specific section of the inclined surface 12-3. The release member 30 is pushed in the direction opposite to the insertion of the pipe 1 by the restoring force of the pressure spring 30-1 at the moment when the fitting hole 33 is positioned, and as a result, the contact member 40 is connected to the pipe 1. It is pressed to prevent the deviation of the outside.

In other words, when the release member 30 is pressed toward the synthetic resin body 10, the teeth 41 of the contact member 40 are positioned at a specific section of the inclined surface 12-3 mentioned above. When the release member 30 is moved to the outside, the insertion piece 41 can be inserted or detached. On the contrary, the teeth 41 of the contact member 40 are supported on the inclined surface side of which the diameter is reduced. Pressure so that the pipe (1) is not separated.

In addition, when the pipe connecting device of the present invention is buried in the basement or wall, foreign matter is interposed between the gap between the synthetic resin body 10 and the release member 30, protruding ribs 31 to prevent the problem that the maintenance work is cumbersome in the future. A cover portion 32 extending to cover a portion of the synthetic resin body 10 may be further provided along the end circumference.

As a structure for preventing the release member 30 from being separated from the synthetic resin body 10, an insertion groove 34 (hole shape) is provided between the fitting hole 33 and the protruding rib 31 of the release member 30. And a movement limiting projection 12-21 inserted into the insertion groove 34 in the straight section 12-2 of the synthetic resin body 10, the release member provided with the close contact member 40 is formed. When the part of the 30 is bent and inserted into the synthetic resin body 10, the release restrictor 12, which moves in a straight direction, can be positioned in the insertion groove 34 so that the release member 30 moves in a straight direction. 10), wherein the insertion groove (34) is a distance from the point where the movement limiting projections (12-21) is located in the direction of the protrusion rib 31, the release member 30 is inserted into the synthetic resin body (10) It is preferably formed.

As described, the movement limiting protrusions 12-21 may be positioned in the insertion grooves 34 in the process of being inserted while bending a part of the release member 30 to the synthetic resin body 10, but at this time release Since the operation of pushing the member 30 into the synthetic resin body 10 and allowing the movement limiting projections 12-21 to be positioned in the insertion groove 34 can be rather cumbersome, the greater flexibility of the release member 30 can be achieved. While forming a thickness reducing portion 35 for each of the plurality of insertion grooves 34 to allow the movement limiting projections (12-21) to pass through and further inserted between the insertion groove 34 and the thickness reduction portion 35 By having the sliding surface 36 inclined gradually upward from the 34 toward the thickness reducing portion 35, the thickness is felt when the release member 30 provided with the contact member 40 is pushed into the synthetic resin body 10. Even if the moving limiting projection 12-21 passes through the small part 35, When the insertion groove 34 and the movement limiting protrusions 12-21 are disposed at the shortest distances while being locked, the release member 30 is rotated so that the movement limiting protrusions 12-21 reduce the thickness 35 and the insertion groove. The release member 30 and the contact member 40 may be prevented from being separated from the synthetic resin body 10 by allowing the sliding surface 36 to be disposed in the insertion groove 34 more easily.

In addition, the pipe body 1 is provided on the inner surface of the synthetic resin body 10 so that the pipe 1 is inserted into the both sides by the same length, so that the pipe 1 is inserted only by a certain length. 10) Pipes arranged on both sides may be fixed by the same length.

Hereinafter, a pipe connecting apparatus according to the present invention having a reinforcement structure for enduring higher water pressure with a synthetic resin material will be described.

3 to 6 is a view showing a reinforcing member according to the present invention.

In the pipe connection device of the present invention, the portion where stress is most concentrated is the inclined surface 12-3 for supporting the protruding piece 42 of the contact member 40, so that the hydraulic pressure is applied to the inclined surface 12-3 as the pressure increases. The partial stress is also increased, so when the synthetic resin body 10 is made of a general plastic pipe connector material such as ABS, PVC, CPVC, HDPE, etc., it is caused by the protrusion 42 at a relatively large hydraulic pressure such as 50 kgf / cm 2 or more. As the inclined surface 12-3 is damaged, a phenomenon in which the release member 30 is separated from the synthetic resin body 10 may occur.

Therefore, in the present invention, there is a structure in which the material forming the inclined surface 12-3 of the synthetic resin body 10 is replaced with a reinforcing member 50 of a material such as metal or reinforced plastic, such a reinforcing member 50 An example of the structure is a part of the snap ring is cut part is installed in the groove of the expansion portion 12 by the elastic force, another example is the reinforcement of the ring shape that is inserted together in the mold when the synthetic resin body 10 injection The member 50 may be mentioned, and the latter ring-shaped reinforcing member 50 may be formed through a separate machining process after injection.

In addition, in the case of the synthetic resin body 10, it is essentially provided with a welding line that the resin abuts upon injection and this welding line is considered to be a weak part in the synthetic resin body 10 of the cylindrical structure, the synthetic resin body 10 is stronger In order to withstand the hydraulic pressure, it is preferable that a reinforcing rib 13 for reinforcing the welding line is provided.

Claims (7)

A fitting portion 11 into which the pipe 1 is fitted in both directions from the center, and integrally extends from the fitting portion 11, and the stepped groove 12-1 and a straight section from the outside along the pipe 1 insertion direction. (12-2) and the synthetic resin body (10) consisting of an extended portion (12) which is sequentially provided with an inclined surface (12-3) to expand the inner diameter;
A ring part 21 disposed in a fixing groove 10-1 formed between the fitting part 11 and the expansion part 12 of the synthetic resin body 10, and the synthetic resin body 10 integrally formed from the ring part 21. A rubber packing (20) having a wing portion (22) extending obliquely toward the center and being in close contact with the outer peripheral surface of the pipe (1);
Protruding ribs 31 are provided at the outer ends thereof to allow the pressure springs 30-1 to be disposed between the stepped grooves 12-1 and the protruding ribs 31 of the synthetic resin body 10, and a part of the synthetic resin body ( A cylindrical release member 30 inserted in 10);
Installed at regular intervals on the side of the release member 30 positioned on the inclined surface 12-3 of the synthetic resin body 10 and having teeth 41, a pipe 1 may be inserted into the synthetic resin body 10. When the tooth 41 is in close contact with the outer peripheral surface of the pipe (1) by the restoring force of the pressure spring (30-1); One-touch piping connection device, characterized in that consisting of. The method according to claim 1,
One-touch piping connection device, characterized in that the inclined surface (12-3) of the synthetic resin body (10) is provided in the reinforcing member (50) of metal or reinforced plastic material is installed in the expansion portion (12). The method according to claim 1,
The release member 30 is provided with a fitting hole 33 to which the contact member 40 is fitted and fixed, and the teeth 41 are inserted into the contact member 40 inserted into the fitting hole 33. One-touch piping connection device characterized in that the projecting piece 42 is supported by the inclined surface (12-3) to be in close contact. The method according to claim 3,
An insertion groove 34 is formed between the fitting hole 33 and the protruding rib 31 of the release member 30, and the insertion groove 34 is formed in the straight section 12-2 of the synthetic resin body 10. One-touch piping connection device, characterized in that the movement limiting projection (12-21) is provided to prevent the release member 30 is separated. The method of claim 4,
The release member 30 is provided with a thickness reducing portion 35 between each of the plurality of insertion grooves 34 to allow the movement limiting projections 12-21 to pass therethrough while being bent, and is inserted from the thickness reducing portion 35. One-touch piping connection device further comprises a sliding surface 36 inclined upwardly into the groove (34). The method according to claim 1,
One-touch piping connection device, characterized in that the central portion of the synthetic resin body 10 is further provided with a reinforcing rib 13 for reinforcing the welding line formed during injection. The method according to claim 1,
One-touch piping connection device, characterized in that further provided with a cover portion 32 extending around the end of the protruding rib 31 of the release member 20 to cover a part of the synthetic resin body (10).
KR1020120088124A 2011-09-02 2012-08-13 Pipe connecting apparatus of one-touch type KR20140021845A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
KR1020120088124A KR20140021845A (en) 2012-08-13 2012-08-13 Pipe connecting apparatus of one-touch type
CN2012800012012A CN103282714A (en) 2011-09-02 2012-08-31 One touch-type pipe connection apparatus
EP12772185.0A EP2589848A4 (en) 2011-09-02 2012-08-31 One touch-type pipe connection apparatus
PCT/KR2012/006961 WO2013032254A2 (en) 2011-09-02 2012-08-31 One touch-type pipe connection apparatus
AU2012244266A AU2012244266A1 (en) 2011-09-02 2012-08-31 One-touch pipe connection device
JP2013531519A JP5438869B2 (en) 2011-09-02 2012-08-31 One-touch type pipe connecting device
CA2788519A CA2788519A1 (en) 2011-09-02 2012-09-04 One-touch pipe connection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120088124A KR20140021845A (en) 2012-08-13 2012-08-13 Pipe connecting apparatus of one-touch type

Publications (1)

Publication Number Publication Date
KR20140021845A true KR20140021845A (en) 2014-02-21

Family

ID=50268067

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120088124A KR20140021845A (en) 2011-09-02 2012-08-13 Pipe connecting apparatus of one-touch type

Country Status (1)

Country Link
KR (1) KR20140021845A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101704782B1 (en) * 2016-09-06 2017-02-08 (주)씨디씨뉴매틱 One touch Connecting Valve Assembly for Hose

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101704782B1 (en) * 2016-09-06 2017-02-08 (주)씨디씨뉴매틱 One touch Connecting Valve Assembly for Hose

Similar Documents

Publication Publication Date Title
JP5438869B2 (en) One-touch type pipe connecting device
KR101025542B1 (en) Pipe connecting apparatus
US20130056976A1 (en) One-touch pipe connection device
KR101011018B1 (en) Water supply and drainage pipe
KR101274094B1 (en) Pipe connecting apparatus of one-touch type
KR101868756B1 (en) Branch pipe coupler
EA026348B1 (en) Polymer pipe connection assembly
JP2011002012A (en) Pipe joint structure
KR101329805B1 (en) Pipe connecting apparatus of one-touch type
KR100902886B1 (en) A coupler for connecting water pipe
KR102028180B1 (en) Pipe assembly
KR200484415Y1 (en) Waterproof connector of sewer concrete pipe joint with socket
KR101120145B1 (en) Connection joint for piping
KR20140085958A (en) Pipe connecting apparatus of one-touch type
CA2458710C (en) Improved pipe clamp inner seal
KR20140021845A (en) Pipe connecting apparatus of one-touch type
KR20180129145A (en) Packing for pipe sealing and pipe assembly having the same
KR20110103775A (en) Coupling packing for pipe and copuler thereby
KR101432945B1 (en) Pipe connecting apparatus of one-touch type
CN114761725B (en) Plug connector assembly
KR101023940B1 (en) Apparatus for connecting plastic pipes
KR20130123016A (en) Pipe connecting apparatus of one-touch type
KR101208671B1 (en) Device for fixing pipe
KR20130049957A (en) Pipe connecting apparatus of one-touch type
KR101442142B1 (en) Jointing pipe for pressure pipe connect

Legal Events

Date Code Title Description
N231 Notification of change of applicant
N231 Notification of change of applicant
N231 Notification of change of applicant
WITN Withdrawal due to no request for examination