CN102174946A - Brake pad of railway vehicle brake device - Google Patents
Brake pad of railway vehicle brake device Download PDFInfo
- Publication number
- CN102174946A CN102174946A CN 201110065259 CN201110065259A CN102174946A CN 102174946 A CN102174946 A CN 102174946A CN 201110065259 CN201110065259 CN 201110065259 CN 201110065259 A CN201110065259 A CN 201110065259A CN 102174946 A CN102174946 A CN 102174946A
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- backboard
- supporting base
- location
- friction piece
- hole
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- 238000009434 installation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000617 Mangalloy Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention relates to a brake pad of a railway vehicle brake device. The brake pad is characterized by comprising a pad backboard, multiple pad friction bodies, multiple first support seats, multiple second support seats and multiple positioning clamps, wherein the pad backboard is provided with a left wing plate and a right wing plate; each first support seat is of a triangular petal shape, and each second support seat is of a dumbbell shape; the first and second support seats are connected with positioning cone tables and positioning cone table holes, as well as positioning navels and first positioning through holes which are arranged opposite to the first support seats and the second support seats on the pad backboard; each pad friction body comprises a friction body backboard, a strut and a friction body which are connected together; the struts pass through the positioning cone table holes opposite to the first support seats or second support seats and a first positioning step hole or second positioning step hole arranged on the pad backboard, and then are fixed on the pad backboard by the positioning clamps. The brake pad provided by the invention has good brake performance, is safe and reliable in operation, and can be widely applied to various railway vehicle brake systems, particularly to the brake system of a high-speed motor train unit.
Description
Technical field
The present invention relates to a kind of braking device, particularly about a kind of brake pad of railway vehicle braking device.
Background technique
Home and abroad rail motor set bogie of car brake rigging generally adopts the disc brake of reel and two kinds of forms of wheel disc, and the material of the brake lining friction piece in the disc brake adopts powder metallurgy or composite etc. usually.Because car brakeing initial velocity height, particularly EMU, during braking the friction pair temperature rise higher relatively, not only require brake lining friction piece Wear-resistant, high-temperature resistant, and have the good heat transfer performance between the housing construction that requires friction piece to install.Therefore, provide the good brake pad that braking ability requires that satisfies, it is very necessary to improve the car brakeing Security effectively.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide and a kind ofly can satisfy and improve vehicle braking performances, guarantee the brake pad of the railway vehicle braking device of vehicle operating safety.
For achieving the above object, the present invention is by the following technical solutions: a kind of brake pad of railway vehicle braking device is characterized in that: it comprises a brake lining backboard, some brake lining friction pieces, some first supporting bases, some second supporting bases and some location cards; Described brake lining backboard is the arcuate structure of upper and lower symmetry, the one side is provided with the left wing plate that is used to locate the braking clamp, opposite side is provided with the right wing plate that is used to locate the braking clamp, the upper and lower of described brake lining backboard is respectively arranged with the through hole that connects the braking clamp, and the some first positioning step hole and second positioning step holes that is used for fixing described brake lining friction piece; It is petal that described first supporting base is triangle, described second supporting base is dumbbell-like shape, described first supporting base by with described brake lining backboard on the location frustum that is oppositely arranged and the first location taper platform hole, location navel is connected with first positioning through hole, described second supporting base by with described brake lining backboard on be oppositely arranged the location frustum and the second location taper platform hole, locate navel and be connected with second positioning through hole; Described brake lining friction piece comprises friction piece backboard, pillar and the friction piece that links into an integrated entity, described pillar is fixed on the described brake lining backboard with described location card after passing the taper platform hole, location and the first positioning step hole or the second positioning step hole on the brake lining backboard that is oppositely arranged with described first supporting base or second supporting base.
The triangle petal place of each described first supporting base is provided with taper platform hole, a location, and the middle part of described first supporting base is provided with a location frustum, wherein between two petals with described location frustum stretch out that direction is consistent to be located to be provided with one and locate navel.
Two dumbbell ends of described second supporting base are respectively arranged with a location taper platform hole, and described second supporting base middle part is arranged at intervals with a location frustum and a location navel.
Described brake lining backboard middle part is provided with a horizontal elongated groove, is arranged at intervals with two lightening holes in the described groove.
Described friction piece backboard is provided with a center hole and some fill orifices, described friction piece is one to have the long-round-shape cylinder of center hole, described pillar is fitted in the center hole of described friction piece backboard, and described friction piece and described friction piece backboard and pillar are sintered into one.
The quantity of described first supporting base is symmetrically arranged two, and the quantity of second supporting base is symmetrically arranged six.
The present invention is owing to take above technological scheme, it has the following advantages: 1, the present invention is owing to be provided with interconnective location navel between each parts, location frustum, reach left wing plate, right wing plate or the like, therefore can effectively guarantee axially locating between each parts, radial location and circumferencial direction positioning relation, make compact structure of the present invention, braking ability is good, and is safe.2, the present invention not only can realize connection between each parts of brake pad by brake lining backboard, brake lining friction piece, first supporting base, second supporting base and location card, and can effectively transmit braking heat load and power, therefore, the present invention can improve the Security of vehicle braking performances.3, the present invention makes whole brake pad weight saving because the brake lining backboard is provided with groove and lightening hole.Braking ability of the present invention is good, and is safe and reliable to operation, and it can be widely used in the different kinds of railways motor vehicle braking system, and is specially adapted in the braking system of EMU.
Description of drawings
Fig. 1 is a structural representation of the present invention
Fig. 2 is Fig. 1 rear view
Fig. 3 is the A-A sectional view of Fig. 2
Fig. 4 is a brake lining back board structure schematic representation of the present invention
Fig. 5 is the A-A sectional view of Fig. 4
Fig. 6 is a brake lining friction piece structural representation of the present invention
Fig. 7 is that friction piece backboard of the present invention and column are in conjunction with schematic representation
Fig. 8 is the A-A sectional view of Fig. 7
Fig. 9 is the present invention's first clamping support schematic representation
Figure 10 is the A-A sectional view of Fig. 9
Figure 11 is the present invention's second clamping support schematic representation
Figure 12 is the A-A sectional view of Figure 11
Figure 13 is a location card structural representation of the present invention
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
As Fig. 1, Fig. 2, shown in Figure 3, the present invention includes a brake lining backboard 10, some brake lining friction pieces 30, some first supporting bases 40, some second supporting bases 50 and some location cards 60.
As Fig. 2, Fig. 4, shown in Figure 5, brake lining backboard 10 of the present invention is the arcuate structure of upper and lower symmetry, the employing steel material is made, brake lining backboard 10 1 sides are provided with left wing plate 11, opposite side is provided with right wing plate 12, the middle part of brake lining backboard 10 is provided with a horizontal elongated groove 13, is arranged at intervals with two lightening holes 14 in groove 13.Upper and lower auxiliary hole 15 and the through hole 16 of being respectively arranged with at brake lining backboard 10; Also be provided with the first positioning step hole 17 and the second positioning step hole 18 that are connected with brake lining friction piece 30 on the brake lining backboard 10, the first location taper platform hole 19 and first positioning through hole 21 that are connected with first supporting base 40, and the second location taper platform hole 20 and second positioning through hole 22 that are connected with second supporting base 50.
As Fig. 6, Fig. 7, shown in Figure 8, brake lining friction piece 30 of the present invention comprises friction piece backboard 31, pillar 32 and friction piece 33.Friction piece backboard 31 is provided with a center hole 34 and some fill orifices 35, and pillar 32 is fitted in the center hole 34 of friction piece backboard 31, and friction piece 33 is sintered into one with friction piece backboard 31 and pillar 32.Pillar 32 tops are provided with the recessed edge 36 of a circle, friction piece 33 is one to have the cylindrical body of center hole 37, cut edge and form similar " long-round-shape " structure in cylindrical both sides, center hole 37 can be realized the friction piece heat radiation on the one hand, can store the buffing of friction piece 33 on the other hand.
As Fig. 9, shown in Figure 10, it is petal that first supporting base 40 is triangle, and the middle part of first supporting base, 40 one sides is provided with a location frustum 41, and each petal place that the bottom is provided with location navel 42, the first supporting bases 40 is provided with a location taper platform hole 43.Corresponding with the location frustum 41 of each first supporting base 40 with the position of location navel 42, the first location taper platform hole 19 and first positioning through hole 21 are set on brake lining backboard 10.
As Figure 11, shown in Figure 12, second supporting base 50 of the present invention is dumbbell-like shape, and the two dumbbell ends that second supporting base, 50 middle parts are arranged at intervals with a location frustum 51 and location navel 52, the second supporting bases 50 are respectively arranged with a location taper platform hole 53.Corresponding with the location frustum 51 of each second supporting base 50 with the position of location navel 52, be provided with the second location taper platform hole 20 and second positioning through hole 22 at brake lining backboard 10.
As shown in figure 13, location card 60 of the present invention adopts manganese steel or other elastic material to be made, and its shape can be decided as required, as is ω shape, and location card 60 is to be used for the pillar 32 of brake pad friction piece 30 is positioned at brake lining backboard 10.
When the present invention installs:
At first location frustum on each first supporting base 40 41 and location navel 42 are inserted the corresponding first location taper platform hole 19 and first positioning through hole 21 on the brake lining backboard 10 respectively; The pillar 32 of brake lining friction piece 30 is passed taper platform hole, location 43 on first supporting base 40 and the first positioning step hole 17 on the brake lining backboard 10 successively; Again location card 60 is clamped on the recessed edge 35 on the pillar 32 on the brake lining backboard 10 from brake lining backboard 10 opposite sides.
Then location frustum on each second supporting base 50 51 and location navel 52 are inserted the corresponding second location taper platform hole 20 and second positioning through hole 22 on the brake lining backboard 10 respectively; The pillar 32 of brake lining friction piece 30 is passed taper platform hole, location 53 on second supporting base 50 and the second positioning step hole 18 on the brake lining backboard 10 successively; Again location card 60 is clamped on the recessed edge 35 on the pillar 32 on the brake lining backboard 10 from brake lining backboard 10 opposite sides, finishes integral installation.
After the installation of the present invention, side directions will brakes clamp and be inserted in from top to down on the brake lining backboard 10 in the left wing plate 11 of brake lining backboard 10 and the right wing plate 12, be connected with the respective aperture of braking clamp by the through hole 16 of pin with brake lining backboard 10 then.
The various embodiments described above only are used to illustrate the present invention, and wherein the structure of each parts, Placement etc. all can change to some extent, and every equivalents of carrying out on the basis of technical solution of the present invention and improvement all should not got rid of outside protection scope of the present invention.
Claims (10)
1. the brake pad of a railway vehicle braking device, it is characterized in that: it comprises a brake lining backboard, some brake lining friction pieces, some first supporting bases, some second supporting bases and some location cards;
Described brake lining backboard is the arcuate structure of upper and lower symmetry, the one side is provided with the left wing plate that is used to locate the braking clamp, opposite side is provided with the right wing plate that is used to locate the braking clamp, the upper and lower of described brake lining backboard is respectively arranged with the through hole that connects the braking clamp, and the some first positioning step hole and second positioning step holes that is used for fixing described brake lining friction piece;
It is petal that described first supporting base is triangle, described second supporting base is dumbbell-like shape, described first supporting base by with described brake lining backboard on the location frustum that is oppositely arranged and the first location taper platform hole, location navel is connected with first positioning through hole, described second supporting base by with described brake lining backboard on be oppositely arranged the location frustum and the second location taper platform hole, locate navel and be connected with second positioning through hole;
Described brake lining friction piece comprises friction piece backboard, pillar and the friction piece that links into an integrated entity, described pillar is fixed on the described brake lining backboard with described location card after passing the taper platform hole, location and the first positioning step hole or the second positioning step hole on the brake lining backboard that is oppositely arranged with described first supporting base or second supporting base.
2. the brake pad of a kind of railway vehicle braking device as claimed in claim 1, it is characterized in that: the triangle petal place of each described first supporting base is provided with a location taper platform hole, the middle part of described first supporting base is provided with a location frustum, wherein between two petals with described location frustum stretch out that direction is consistent to be located to be provided with one and locate navel.
3. the brake pad of a kind of railway vehicle braking device as claimed in claim 1, it is characterized in that: two dumbbell ends of described second supporting base are respectively arranged with a location taper platform hole, and described second supporting base middle part is arranged at intervals with a location frustum and a location navel.
4. the brake pad of a kind of railway vehicle braking device as claimed in claim 2, it is characterized in that: two dumbbell ends of described second supporting base are respectively arranged with a location taper platform hole, and described second supporting base middle part is arranged at intervals with a location frustum and a location navel.
5. as the brake pad of claim 1 or 2 or 3 or 4 described a kind of railway vehicle braking devices, it is characterized in that: described brake lining backboard middle part is provided with a horizontal elongated groove, is arranged at intervals with two lightening holes in the described groove.
6. as the brake pad of claim 1 or 2 or 3 or 4 described a kind of railway vehicle braking devices, it is characterized in that: described friction piece backboard is provided with a center hole and some fill orifices, described friction piece is one to have the long-round-shape cylinder of center hole, described pillar is fitted in the center hole of described friction piece backboard, and described friction piece and described friction piece backboard and pillar are sintered into one.
7. the brake pad of a kind of railway vehicle braking device as claimed in claim 5, it is characterized in that: described friction piece backboard is provided with a center hole and some fill orifices, described friction piece is one to have the long-round-shape cylinder of center hole, described pillar is fitted in the center hole of described friction piece backboard, and described friction piece and described friction piece backboard and pillar are sintered into one.
8. according to the brake pad of claim 1 or 2 or 3 or 4 or 7 described railway vehicle braking devices, it is characterized in that: the quantity of described first supporting base is symmetrically arranged two, and the quantity of second supporting base is symmetrically arranged six.
9. the brake pad of railway vehicle braking device according to claim 5, it is characterized in that: the quantity of described first supporting base is symmetrically arranged two, the quantity of second supporting base is symmetrically arranged six.
10. the brake pad of railway vehicle braking device according to claim 6, it is characterized in that: the quantity of described first supporting base is symmetrically arranged two, the quantity of second supporting base is symmetrically arranged six.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100652590A CN102174946B (en) | 2011-03-17 | 2011-03-17 | Brake pad of railway vehicle brake device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100652590A CN102174946B (en) | 2011-03-17 | 2011-03-17 | Brake pad of railway vehicle brake device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102174946A true CN102174946A (en) | 2011-09-07 |
| CN102174946B CN102174946B (en) | 2012-07-11 |
Family
ID=44518161
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100652590A Active CN102174946B (en) | 2011-03-17 | 2011-03-17 | Brake pad of railway vehicle brake device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102174946B (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705405A (en) * | 2012-05-07 | 2012-10-03 | 北京天宜上佳新材料有限公司 | Floatation type brake pad for high speed train |
| CN102840259A (en) * | 2012-06-28 | 2012-12-26 | 黄启镇 | Brake pad for vehicle |
| CN102927170A (en) * | 2012-06-05 | 2013-02-13 | 北京天宜上佳新材料有限公司 | Novel brake pad with dovetailing steel back structure and floatable friction blocks |
| CN103939504A (en) * | 2014-03-14 | 2014-07-23 | 天津机辆轨道交通装备有限责任公司 | High-speed train brake pad capable of automatically regulating attached friction |
| CN105840700A (en) * | 2016-06-08 | 2016-08-10 | 湖南鼎懋科技有限公司 | Powder metallurgy brake pad for train |
| ES2553837R1 (en) * | 2013-02-06 | 2016-10-14 | Beijing Tianyishangjia New Material Co., Ltd. | FLOATING TYPE BRAKE PAD FOR USE IN RAIN OR SNOW CLIMATE CONDITIONS |
| CN106763330A (en) * | 2016-12-26 | 2017-05-31 | 常州中车铁马科技实业有限公司 | Train brake plate |
| CN108188880A (en) * | 2017-12-14 | 2018-06-22 | 中车长春轨道客车股份有限公司 | A kind of Braking System for Multiple Units eccentric wear amount transfinites the restorative procedure of brake lining |
| IT202000028781A1 (en) * | 2020-11-27 | 2022-05-27 | Cofren Srl | DISC BRAKE FOR RAILWAY VEHICLES |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29821113U1 (en) * | 1998-11-25 | 1999-02-18 | AlliedSignal Bremsbelag GmbH, 21509 Glinde | Brake pad |
| CN101975234A (en) * | 2010-10-18 | 2011-02-16 | 常州市铁马科技实业有限公司 | Train brake lining with adjuster |
| CN202023865U (en) * | 2011-03-17 | 2011-11-02 | 北京浦然铁路制动科技有限责任公司 | Brake pad of railway vehicle braking device |
-
2011
- 2011-03-17 CN CN2011100652590A patent/CN102174946B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29821113U1 (en) * | 1998-11-25 | 1999-02-18 | AlliedSignal Bremsbelag GmbH, 21509 Glinde | Brake pad |
| CN101975234A (en) * | 2010-10-18 | 2011-02-16 | 常州市铁马科技实业有限公司 | Train brake lining with adjuster |
| CN202023865U (en) * | 2011-03-17 | 2011-11-02 | 北京浦然铁路制动科技有限责任公司 | Brake pad of railway vehicle braking device |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705405A (en) * | 2012-05-07 | 2012-10-03 | 北京天宜上佳新材料有限公司 | Floatation type brake pad for high speed train |
| CN102927170A (en) * | 2012-06-05 | 2013-02-13 | 北京天宜上佳新材料有限公司 | Novel brake pad with dovetailing steel back structure and floatable friction blocks |
| CN102840259A (en) * | 2012-06-28 | 2012-12-26 | 黄启镇 | Brake pad for vehicle |
| ES2553837R1 (en) * | 2013-02-06 | 2016-10-14 | Beijing Tianyishangjia New Material Co., Ltd. | FLOATING TYPE BRAKE PAD FOR USE IN RAIN OR SNOW CLIMATE CONDITIONS |
| CN103939504A (en) * | 2014-03-14 | 2014-07-23 | 天津机辆轨道交通装备有限责任公司 | High-speed train brake pad capable of automatically regulating attached friction |
| CN105840700A (en) * | 2016-06-08 | 2016-08-10 | 湖南鼎懋科技有限公司 | Powder metallurgy brake pad for train |
| CN105840700B (en) * | 2016-06-08 | 2019-02-01 | 湖南城际科技有限公司 | A kind of train powder metallurgy brake pad |
| CN106763330A (en) * | 2016-12-26 | 2017-05-31 | 常州中车铁马科技实业有限公司 | Train brake plate |
| CN106763330B (en) * | 2016-12-26 | 2019-08-23 | 常州中车铁马科技实业有限公司 | Train brake plate |
| CN108188880A (en) * | 2017-12-14 | 2018-06-22 | 中车长春轨道客车股份有限公司 | A kind of Braking System for Multiple Units eccentric wear amount transfinites the restorative procedure of brake lining |
| IT202000028781A1 (en) * | 2020-11-27 | 2022-05-27 | Cofren Srl | DISC BRAKE FOR RAILWAY VEHICLES |
| EP4006373A1 (en) * | 2020-11-27 | 2022-06-01 | Cofren S.r.L. | Disc brake for railway vehicles |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102174946B (en) | 2012-07-11 |
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Owner name: HUANG QIZHEN Free format text: FORMER OWNER: BEIJING PURAN RAILWAY BRAKING TECHNOLOGY CO., LTD. Effective date: 20120723 |
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Free format text: CORRECT: ADDRESS; FROM: 102211 CHANGPING, BEIJING TO: 100036 HAIDIAN, BEIJING |
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Effective date of registration: 20120723 Address after: 100036 Haidian District Fuxing Road, No. 65, telecom industrial building, No. 707, Beijing, China Patentee after: Huang Qizhen Address before: 102211 Beijing city of Changping District Bai Shan Zhen Meng Lizu Village West Patentee before: Beijing Puran Railway Braking Technology Co., Ltd. |
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Owner name: BEIJING PURAN RAILWAY BRAKING TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: HUANG QIZHEN Effective date: 20130108 |
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Free format text: CORRECT: ADDRESS; FROM: 100036 HAIDIAN, BEIJING TO: 102211 CHANGPING, BEIJING |
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Effective date of registration: 20130108 Address after: 102211 Beijing city of Changping District Bai Shan Zhen Meng Lizu Village West Patentee after: Beijing Puran Railway Braking Technology Co., Ltd. Address before: 100036 Haidian District Fuxing Road, No. 65, telecom industrial building, No. 707, Beijing, China Patentee before: Huang Qizhen |
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| C56 | Change in the name or address of the patentee |
Owner name: BEIJING PURAN TRACK TRAFFIC TECHNOLOGY CO., LTD. Free format text: FORMER NAME: BEIJING PURAN RAILWAY BRAKING TECHNOLOGY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 102211 Beijing city of Changping District Bai Shan Zhen Meng Lizu Village West Patentee after: Beijing Puran Railway Transportation Technology Co., Ltd. Address before: 102211 Beijing city of Changping District Bai Shan Zhen Meng Lizu Village West Patentee before: Beijing Puran Railway Braking Technology Co., Ltd. |
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Effective date of registration: 20170221 Address after: 102299 Changping District science and Technology Park, Beijing Road No. 6, building No. 4, floor 1294, No. 37 Patentee after: Beijing Puran Railway Transportation Technology Co., Ltd. Patentee after: Shandong Heze Germany new Mstar Technology Ltd Address before: 102211 Beijing city of Changping District Bai Shan Zhen Meng Lizu Village West Patentee before: Beijing Puran Railway Transportation Technology Co., Ltd. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Brake pad of railway vehicle brake device Effective date of registration: 20180730 Granted publication date: 20120711 Pledgee: Heze rural commercial bank Limited by Share Ltd Pledgor: Shandong Heze Germany new Mstar Technology Ltd|Beijing Puran Railway Transportation Technology Co., Ltd.|Huang Qizhen Registration number: 2018990000623 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20191219 Granted publication date: 20120711 Pledgee: Heze rural commercial bank Limited by Share Ltd Pledgor: Shandong Heze Detong New Material Technology Co., Ltd.| Beijing puran Rail Transit Technology Co., Ltd Registration number: 2018990000623 |
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Address after: 102299 C104 2, 2nd floor, No. 16 Building, 37 Qianqian Road, Changping District Science and Technology Park, Beijing Co-patentee after: SHANDONG HEZE DETONG NEW MATERIAL TECHNOLOGY Co.,Ltd. Patentee after: Beijing Pulan Rail Transit Technology Co., Ltd Address before: 102299 Changping District science and Technology Park, Beijing Road No. 6, building No. 4, floor 1294, No. 37 Co-patentee before: SHANDONG HEZE DETONG NEW MATERIAL TECHNOLOGY Co.,Ltd. Patentee before: BEIJING PURAN RAILWAY TRANSPORATION SCIENCE & TECHNOLOGY Co.,Ltd. |
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