CN111648582A - Manual cleaning pedal device for building glass curtain wall - Google Patents

Manual cleaning pedal device for building glass curtain wall Download PDF

Info

Publication number
CN111648582A
CN111648582A CN202010426935.1A CN202010426935A CN111648582A CN 111648582 A CN111648582 A CN 111648582A CN 202010426935 A CN202010426935 A CN 202010426935A CN 111648582 A CN111648582 A CN 111648582A
Authority
CN
China
Prior art keywords
fixedly connected
glass curtain
curtain wall
opening
pedal
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
CN202010426935.1A
Other languages
Chinese (zh)
Inventor
苏春柏
俞兴紫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanjing Yuyi Communication Technology Co Ltd
Original Assignee
Nanjing Yuyi Communication Technology Co Ltd
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 Nanjing Yuyi Communication Technology Co Ltd filed Critical Nanjing Yuyi Communication Technology Co Ltd
Priority to CN202010426935.1A priority Critical patent/CN111648582A/en
Publication of CN111648582A publication Critical patent/CN111648582A/en
Withdrawn legal-status Critical Current

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G3/00Scaffolds essentially supported by building constructions, e.g. adjustable in height
    • E04G3/20Scaffolds essentially supported by building constructions, e.g. adjustable in height supported by walls
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G5/00Component parts or accessories for scaffolds
    • E04G5/001Safety or protective measures against falling down relating to scaffoldings
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G5/00Component parts or accessories for scaffolds
    • E04G5/04Means for fastening, supporting, or bracing scaffolds on or against building constructions
    • E04G5/046Means for fastening, supporting, or bracing scaffolds on or against building constructions for fastening scaffoldings on walls

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Load-Bearing And Curtain Walls (AREA)

Abstract

The invention belongs to the technical field of glass curtain wall cleaning, and particularly relates to a manual cleaning pedal device for a building glass curtain wall, which comprises an installation block, wherein installation grooves are formed in the surfaces of two sides of the installation block, a pressure spring is fixedly connected to the inner wall of one side of each of the two installation grooves, an extrusion block is fixedly connected to the free end of one end of the pressure spring, a first connecting rod is fixedly connected to the surface of one end of the installation block, an installation opening is formed in the surface of one end of the first connecting rod, a first limiting block is fixedly connected to the inner surface of the installation opening, a telescopic rod is inserted into the installation opening in a sliding mode, and a connecting opening is formed in the upper. This building glass curtain wall manual cleaning pedal device has reached the effect further fixed and protection cleaning personnel safety to the running-board to solved and only relied on the lifting rope to influence the problem that cleaning personnel cleaning efficiency threatened cleaning personnel safety at strong wind and bad weather.

Description

Manual cleaning pedal device for building glass curtain wall
This patent is the divisional application, and the information of former application is as follows, the name: the utility model provides a building glass curtain wall manual cleaning foot pedal device, application number: 2019108011609, filing date: 2019/8/28.
Technical Field
The invention relates to the technical field of glass curtain wall cleaning, in particular to a manual cleaning pedal device for a building glass curtain wall.
Background
The glass curtain wall is a building outer protective structure or decorative structure which has a certain displacement capacity relative to the main structure by a supporting structure system and does not bear the action of the main structure. The wall body has two types of single-layer glass and double-layer glass. The glass curtain wall is a beautiful and novel building wall decoration method and is a remarkable characteristic of modern high-rise building times.
The existing glass curtain wall cleaning method is that cleaning personnel are generally lifted by using lifting ropes and then the surface of the glass curtain wall is cleaned, however, in strong wind seasons, the lifting ropes swing along with the blowing of strong wind, and the cleaning efficiency of the cleaning personnel on the glass curtain wall and the safety of the cleaning personnel can be influenced.
Disclosure of Invention
Based on the technical problems that when the existing glass curtain wall is cleaned in strong wind seasons, a lifting rope swings along with the blowing of strong wind, and the cleaning efficiency of cleaning personnel on the glass curtain wall and the safety of the cleaning personnel are influenced, the invention provides a manual cleaning pedal device for a building glass curtain wall.
The invention provides a manual cleaning pedal device for a building glass curtain wall, which comprises mounting blocks, wherein mounting grooves are formed in the surfaces of two sides of each mounting block, the inner walls of one sides of the two mounting grooves are fixedly connected with pressure springs, and free ends of one ends of the pressure springs are fixedly connected with extrusion blocks;
a first connecting rod is fixedly connected to the surface of one end of the mounting block, a mounting opening is formed in the surface of one end of the first connecting rod, a first limiting block is fixedly connected to the inner surface of the mounting opening, a telescopic rod is inserted into the mounting opening in a sliding mode, a connecting opening is formed in the upper surface of the other end of the telescopic rod, a threaded rod is movably sleeved on the inner surface of the connecting opening, and a second connecting rod is fixedly connected to the lower surface of the threaded rod;
the pedal is fixedly connected to one end surface of the first connecting rod, mounting holes are formed in one end surface of the pedal, and connecting pipes are fixedly connected to the inner walls of the two mounting holes.
Preferably, the outer surface of one end of the extrusion block is movably inserted into the inner surface of the installation groove, and the surface of one side of the extrusion block is fixedly connected with an anti-slip mat.
Preferably, the outer surface of the telescopic rod is in sliding sleeve joint with the inner surface of the first limiting block, and a second limiting block is fixedly connected to the surface of one end of the telescopic rod.
Preferably, the surface of the second limiting block is in sliding sleeve connection with the inner wall of the mounting opening, and a limiting groove is formed in the surface of one end of the first connecting rod.
Preferably, the upper surface of the connecting port is fixedly connected with a first anti-slip ring, and the outer surface of the threaded rod is in threaded connection with a nut.
Preferably, the lower surface of the nut is fixedly connected with a second anti-slip ring, and the first anti-slip ring is meshed with the second anti-slip ring.
Preferably, a pedal opening is formed in the upper surface of the pedal plate, and a binding band is fixedly connected to the surface of the pedal plate, which is located on the upper surface of the pedal opening.
Preferably, the surface of one end of the connecting pipe is fixedly communicated with a sucker, and the inner wall of the connecting pipe is sleeved with a suction rod in a sliding manner.
Preferably, the one end fixed surface of inhaling the pole is connected with the rubber buffer, two inhale the equal fixedly connected with action bars in the other end surface of pole.
The beneficial effects of the invention are as follows:
1. through the movable grafting of the one end surface that sets up the extrusion piece and the internal surface of mounting groove, one side fixed surface of extrusion piece is connected with the slipmat, has reached the effect to the frictional force increase between extrusion piece and the glass curtain wall to the problem that the extrusion piece can not be fixed in a certain department under the influence of self gravity and the part gravity of cleaning personnel has been solved.
2. The surface of the second limiting block is sleeved with the inner wall of the mounting opening in a sliding mode, the limiting groove is formed in the surface of one end of the first connecting rod, the effect of limiting the telescopic rod in the telescopic process is achieved, and therefore the problem that when the sucker adsorbs the surface of a glass curtain wall, the telescopic rod cannot stretch out and draw back to cause that adsorption of protective measures cannot be reduced is solved.
3. The one end fixed surface intercommunication through setting up the connecting pipe has the sucking disc, and the inner wall of connecting pipe slides and has cup jointed the sucking rod, has reached the effect further fixed and protection cleaning personnel safety to the running-board to solved and only relied on the lifting rope to influence the problem that cleaning personnel cleaning efficiency threatened cleaning personnel safety at strong wind and bad weather.
Drawings
FIG. 1 is a schematic view of a pedal device for manually cleaning a glass curtain wall of a building according to the present invention;
FIG. 2 is a perspective view of an extrusion block structure of the pedal device for manual cleaning of building glass curtain walls, which is provided by the invention;
FIG. 3 is a sectional view of a suction rod structure of a pedal device for manual cleaning of building glass curtain walls, which is provided by the invention;
FIG. 4 is a sectional view of a second connecting rod structure of the pedal device for manually cleaning the architectural glass curtain wall according to the present invention;
FIG. 5 is an enlarged view of the structure at the position A in FIG. 3 of the pedal device for manually cleaning the architectural glass curtain wall according to the present invention;
FIG. 6 is an enlarged view of the structure at B in FIG. 3 of the manual cleaning pedal device for the architectural glass curtain wall in accordance with the present invention;
fig. 7 is an enlarged view of a structure at C in fig. 4 of the pedal device for manually cleaning the architectural glass curtain wall according to the present invention.
In the figure: 1. mounting blocks; 2. mounting grooves; 3. a pressure spring; 4. extruding the block; 5. a first connecting rod; 6. an installation port; 7. a first stopper; 8. a telescopic rod; 9. a connecting port; 10. a threaded rod; 11. a second connecting rod; 12. a foot pedal; 13. mounting holes; 14. a connecting pipe; 15. a non-slip mat; 16. a second limiting block; 17. a limiting groove; 18. a first anti-slip ring; 19. a nut; 20. a second anti-slip ring; 21. a foot opening; 22. binding bands; 23. a suction cup; 24. a suction rod; 25. a rubber plug; 26. an operating lever.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1-7, a pedal device for manually cleaning a building glass curtain wall, as shown in fig. 1-4, comprises an installation block 1, wherein installation grooves 2 are respectively formed on the surfaces of the two sides of the installation block 1, a pressure spring 3 is fixedly connected to the inner wall of one side of each of the two installation grooves 2, and an extrusion block 4 is fixedly connected to the free end of each of the pressure springs 3, so that the effect of increasing the friction force between the extrusion block 4 and the glass curtain wall is achieved, and therefore, the problem that the extrusion block 4 cannot be fixed at a certain position under the influence of the self gravity and the partial gravity of cleaning personnel is solved, the outer surface of one end of the extrusion block 4 is movably inserted into the inner surface of the installation groove 2, and an anti-skid;
as shown in fig. 5, the method for manufacturing the non-slip mat comprises the steps of preparing raw materials, namely preparing the raw materials, polyvinyl chloride powder, diisooctyl phthalate, nitrile rubber and N-phenyl-alpha-aniline;
88 parts of polyvinyl chloride powder, 3 parts of diisooctyl phthalate, 5 parts of nitrile rubber and 4 parts of N-phenyl-alpha-aniline;
step two, banburying the raw materials in the step one through a banbury mixer, and cooling the banburied materials;
step three, cutting the material cooled in the step two by a cutting machine;
as shown in fig. 4 and 7, a first connecting rod 5 is fixedly connected to one end surface of the mounting block 1, a mounting opening 6 is formed in one end surface of the first connecting rod 5, a first limiting block 7 is fixedly connected to an inner surface of the mounting opening 6, a telescopic rod 8 is inserted into the mounting opening 6 in a sliding manner, an outer surface of the telescopic rod 8 is sleeved with an inner surface of the first limiting block 7 in a sliding manner, a second limiting block 16 is fixedly connected to one end surface of the telescopic rod 8, a surface of the second limiting block 16 is sleeved with an inner wall of the mounting opening 6 in a sliding manner, a limiting groove 17 is formed in one end surface of the first connecting rod 5, a connecting port 9 is formed in the upper surface of the other end of the telescopic rod 8, a threaded rod 10 is movably sleeved on the inner surface of the connecting port 9, a first anti-slip ring 18 is fixedly connected to the upper surface of the, the first anti-skid ring 18 is meshed with the second anti-skid ring 20, and the lower surface of the threaded rod 10 is fixedly connected with a second connecting rod 11;
as shown in fig. 1-4 and fig. 6-7, a pedal plate 12 is fixedly connected to one end surface of the first connecting rod 5, a pedal opening 21 is formed in the upper surface of the pedal plate 12, a binding band 22 is fixedly connected to the surface of the pedal plate 12 located on the upper surface of the pedal opening 21, a mounting hole 13 is formed in one end surface of the pedal plate 12, connecting pipes 14 are fixedly connected to the inner walls of the two mounting holes 13, a suction cup 23 is fixedly communicated with one end surface of each connecting pipe 14, a suction rod 24 is slidably sleeved on the inner wall of each connecting pipe 14, a rubber plug 25 is fixedly connected to one end surface of each suction rod 24, and an operating rod 26 is fixedly connected to the other end surface of each suction rod 24, so that the effect of limiting the telescopic rod 8 in the telescopic process is achieved, and the problem that the telescopic rod 8 cannot be stretched and cannot absorb the, the effect of further fixing the pedal 12 and protecting the safety of the cleaning personnel is achieved, and therefore the problem that the cleaning efficiency of the cleaning personnel is influenced only by the lifting rope in strong wind and severe weather to threaten the safety of the cleaning personnel is solved.
The working principle is as follows: during the use, the cleaning personnel will install the piece 1 in the gap between the glass curtain wall, extrusion piece 4 extrudees both sides because pressure spring 3, and then make the surperficial full contact in slipmat 15 and glass curtain wall gap, the cleaning personnel puts into pedal mouth 21 with the foot, tie up the foot with bandage 22 tightly, use the lifting rope to lift by crane, spacing groove 17 can restrict the rotatory angle of running-board 12, when needs further protection, the cleaning personnel can pull action bars 26, make sucking disc 23 inhale on the glass curtain wall surface, when sucking disc 23 adsorbs the glass curtain wall, telescopic link 8 moves to the inside of installing port 6, under the condition of strong wind and bad weather, running-board 12 stabilizes the cleaning personnel's health owing to the fixed of installation piece 1, avoid the cleaning personnel to blow the lifting rope and come the rock back owing to the strong wind.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (6)

1. The utility model provides a building glass curtain wall manual cleaning foot pedal device, includes installation piece (1), its characterized in that: mounting grooves (2) are formed in the surfaces of two sides of the mounting block (1), a pressure spring (3) is fixedly connected to the inner wall of one side of each of the two mounting grooves (2), and an extrusion block (4) is fixedly connected to the free end of one end of each pressure spring (3);
a first connecting rod (5) is fixedly connected to the surface of one end of the mounting block (1), a mounting opening (6) is formed in the surface of one end of the first connecting rod (5), a first limiting block (7) is fixedly connected to the inner surface of the mounting opening (6), a telescopic rod (8) is inserted into the mounting opening (6) in a sliding mode, a connecting opening (9) is formed in the upper surface of the other end of the telescopic rod (8), a threaded rod (10) is movably sleeved on the inner surface of the connecting opening (9), and a second connecting rod (11) is fixedly connected to the lower surface of the threaded rod (10);
one end surface of the first connecting rod (5) is fixedly connected with a pedal (12), one end surface of the pedal (12) is provided with a mounting hole (13), and the inner walls of the two mounting holes (13) are fixedly connected with connecting pipes (14);
the outer surface of one end of the extrusion block (4) is movably inserted into the inner surface of the installation groove (2), and the surface of one side of the extrusion block (4) is fixedly connected with an anti-skid pad (15);
the outer surface of the telescopic rod (8) is in sliding sleeve joint with the inner surface of the first limiting block (7), and the surface of one end of the telescopic rod (8) is fixedly connected with a second limiting block (16);
the surface of the second limiting block (16) is in sliding sleeve connection with the inner wall of the mounting opening (6), and a limiting groove (17) is formed in the surface of one end of the first connecting rod (5).
2. The building glass curtain wall manual cleaning pedal device as claimed in claim 1, wherein: the upper surface of the connecting port (9) is fixedly connected with a first anti-slip ring (18), and the outer surface of the threaded rod (10) is in threaded connection with a nut (19).
3. The building glass curtain wall manual cleaning pedal device as claimed in claim 2, wherein: the lower surface of the nut (19) is fixedly connected with a second anti-skid ring (20), and the first anti-skid ring (18) is meshed with the second anti-skid ring (20).
4. The building glass curtain wall manual cleaning pedal device as claimed in claim 1, wherein: the upper surface of the pedal plate (12) is provided with a pedal opening (21), and the surface of the pedal plate (12) positioned on the upper surface of the pedal opening (21) is fixedly connected with a binding band (22).
5. The building glass curtain wall manual cleaning pedal device as claimed in claim 1, wherein: and a sucker (23) is fixedly communicated with the surface of one end of the connecting pipe (14), and a sucker rod (24) is sleeved on the inner wall of the connecting pipe (14) in a sliding manner.
6. The building glass curtain wall manual cleaning pedal device as claimed in claim 5, wherein: inhale one end fixed surface of pole (24) and be connected with rubber buffer (25), two inhale the equal fixedly connected with action bars (26) in other end surface of pole (24).
CN202010426935.1A 2019-08-28 2019-08-28 Manual cleaning pedal device for building glass curtain wall Withdrawn CN111648582A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010426935.1A CN111648582A (en) 2019-08-28 2019-08-28 Manual cleaning pedal device for building glass curtain wall

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010426935.1A CN111648582A (en) 2019-08-28 2019-08-28 Manual cleaning pedal device for building glass curtain wall
CN201910801160.9A CN110541555B (en) 2019-08-28 2019-08-28 Manual cleaning pedal device for building glass curtain wall

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CN201910801160.9A Division CN110541555B (en) 2019-08-28 2019-08-28 Manual cleaning pedal device for building glass curtain wall

Publications (1)

Publication Number Publication Date
CN111648582A true CN111648582A (en) 2020-09-11

Family

ID=68712291

Family Applications (2)

Application Number Title Priority Date Filing Date
CN201910801160.9A Active CN110541555B (en) 2019-08-28 2019-08-28 Manual cleaning pedal device for building glass curtain wall
CN202010426935.1A Withdrawn CN111648582A (en) 2019-08-28 2019-08-28 Manual cleaning pedal device for building glass curtain wall

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CN201910801160.9A Active CN110541555B (en) 2019-08-28 2019-08-28 Manual cleaning pedal device for building glass curtain wall

Country Status (2)

Country Link
CN (2) CN110541555B (en)
WO (1) WO2021036355A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110541555B (en) * 2019-08-28 2020-04-21 南京驭逡通信科技有限公司 Manual cleaning pedal device for building glass curtain wall
CN111021762B (en) * 2020-01-02 2021-04-09 沙洲职业工学院 Supplementary safe couple of high altitude construction
CN114541747B (en) * 2022-04-06 2023-11-10 安徽开盛津城建设有限公司 Novel construction technology for preventing slurry overflow of constructional column

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000041907A (en) * 1998-07-30 2000-02-15 Taisei Corp Chair-type gondola
CN204233054U (en) * 2014-11-03 2015-04-01 高庆泽 With the window cleaning machine hanging basket of sucker
JP2018023703A (en) * 2016-08-11 2018-02-15 フィグラ株式会社 Window glass cleaning system
GB2553562A (en) * 2016-09-08 2018-03-14 Kaercher Gmbh & Co Kg Alfred Robotic window-cleaning system and safety cord system therfor
CN206687662U (en) * 2016-12-25 2017-12-01 武汉轻工大学 A kind of glass wall aids in adsorbent equipment
CN107338952A (en) * 2017-08-29 2017-11-10 四川弘毅智慧知识产权运营有限公司 A kind of auxiliary construction device for causing construction more stable
CN208491963U (en) * 2017-12-28 2019-02-15 嘉泽正达科技(深圳)有限公司 A kind of vertical rails wind-proof device
CN108497993A (en) * 2018-04-09 2018-09-07 杭州爵沸网络科技有限公司 A kind of building glass curtain wall left and right stable regulation hanger
CN208808344U (en) * 2018-04-09 2019-05-03 杭州爵沸网络科技有限公司 A kind of building glass curtain wall left and right stable regulation hanger
CN109403647A (en) * 2018-10-22 2019-03-01 广州小乙科技有限公司 A kind of robot stabilized device of high altitude operation based on absorption principle
CN109700373A (en) * 2019-01-14 2019-05-03 韩志芬 A kind of high building clean and safe protection adsorbent equipment
CN109736582B (en) * 2019-01-23 2021-04-27 创际建工集团有限公司 Adsorption type leg fixing device and method for glass outer wall construction
CN110541555B (en) * 2019-08-28 2020-04-21 南京驭逡通信科技有限公司 Manual cleaning pedal device for building glass curtain wall

Also Published As

Publication number Publication date
WO2021036355A1 (en) 2021-03-04
CN110541555B (en) 2020-04-21
CN110541555A (en) 2019-12-06

Similar Documents

Publication Publication Date Title
CN110541555B (en) Manual cleaning pedal device for building glass curtain wall
CN201920448U (en) Mightiness sucker
CN104305845A (en) Foldable pneumatic single-direction rolling-shaft limiting curtain support
CN204282798U (en) The safety hanging cradle that a kind of skin decorative operation is special
CN202970401U (en) Self-falling prevention type magnetic control hollow glass provided with built-in venetian blind
CN203655141U (en) Insulating flexible ladder for live working
CN202954755U (en) Pneumatic clamping tile of multifunctional drill stem
CN206336676U (en) One kind carries one-hand clip
CN206170102U (en) A buffering hand claw for robot operation valve
CN208859362U (en) A kind of naked lamp string of illumination convenient for suspension
CN107791063A (en) A kind of industrial processes stationary machines people
CN216713776U (en) Construction hanging basket for building external wall
CN207620174U (en) Decorative board curtain wall installation hook
CN207277888U (en) A kind of pneumatic pick trolley
CN206762049U (en) A kind of high-rise rescue chute of fire-fighting
CN201901785U (en) Liftable clothes drying rack
CN214659015U (en) A safety net for engineering building be convenient for install
CN218581140U (en) High altitude construction safety suspension support frame is built in room
CN218170098U (en) Self-adaptive clamp for producing glassware
CN221053141U (en) Safe suspension structure for building overhead operation
CN212630034U (en) Helmet support with adjustable length
CN218344864U (en) Threading drive mechanism is used in fire engineering construction
CN215926416U (en) Outdoor decorative curtain wall
CN213361309U (en) Indoor warm pipeline fixing device that leads to
CN219445498U (en) Fireproof door frame grouting machine

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
WW01 Invention patent application withdrawn after publication

Application publication date: 20200911

WW01 Invention patent application withdrawn after publication