WO2012037273A1 - Élément de protection de serre-joint à sangle - Google Patents

Élément de protection de serre-joint à sangle Download PDF

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Publication number
WO2012037273A1
WO2012037273A1 PCT/US2011/051623 US2011051623W WO2012037273A1 WO 2012037273 A1 WO2012037273 A1 WO 2012037273A1 US 2011051623 W US2011051623 W US 2011051623W WO 2012037273 A1 WO2012037273 A1 WO 2012037273A1
Authority
WO
WIPO (PCT)
Prior art keywords
band
guard
shield
buckle
combination
Prior art date
Application number
PCT/US2011/051623
Other languages
English (en)
Inventor
Grant Shafer
Stevan Stiefvater
Original Assignee
Band-It-Idex, Inc.
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 Band-It-Idex, Inc. filed Critical Band-It-Idex, Inc.
Priority to EP11825887.0A priority Critical patent/EP2616355A1/fr
Priority to CN2011800547111A priority patent/CN103370262A/zh
Publication of WO2012037273A1 publication Critical patent/WO2012037273A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B25/00—Implements for fastening, connecting or tensioning of wire or strip
    • B25B25/005—Implements for fastening, connecting or tensioning of wire or strip for applying wire clasps to hose couplings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B25/00—Implements for fastening, connecting or tensioning of wire or strip
    • 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
    • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
    • F16L3/22—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals
    • F16L3/23—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals for a bundle of pipes or a plurality of pipes placed side by side in contact with each other
    • F16L3/233—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals for a bundle of pipes or a plurality of pipes placed side by side in contact with each other by means of a flexible band

Definitions

  • Embodiments of the present invention are generally related to band clamps used to secure protective shielding onto tubes, pipes, or other structures (hereinafter “tubes”) used in high temperature and harsh environments.
  • the band clamps employ a protective guard that helps maintain the integrity of the band clamp.
  • the band clamps described herein may be secured about the shield using an easy to use hand-held tensioning tool.
  • Fuel burning power plants employ steam generating boilers that remove heat from exhaust generated by the combustion of coal, oil, gas, or other fuel.
  • the heat obtained from the exhaust is used to produce steam by transferring heat from hot, fast-moving exhaust gases to water or other heat transfer fluid flowing in a series of horizontally or vertically oriented tubes that are positioned in the path of the exhaust.
  • Such exhaust contains heated gas and significant particulate in the form of carbon, acidic materials, caustic materials, etc. that contact the tubes at high speed. Further, over time, the tubes often become coated or caked with soot, an insulator, which adversely affects heat transfer and boiler performance.
  • the soot is removed by soot blowers that employ a series of nozzles that direct high speed steam at the tubes to remove the soot.
  • the tubes are protected by a contoured shield that covers the outer surface of the tube.
  • the shield covers and protects approximately one-half of the surface of the tube, namely the surface of the tube that is in the direct path of the particulate generated by the furnace.
  • Shields commonly protect an area defined by the length of the tube and about 120 to 220 degrees about the tube's outer surface.
  • a plurality of shields are abutted or interlocked to protect longer tube spans.
  • shields are configured such that their inner surface snuggly and fully engages the outer surface of the tube.
  • the tubes are held in place by support members including straps, hose clamps, metal bands, or by other methods known in the art, which may be welded or otherwise interconnected to the shield. In some applications the shield is welded directly to the tube. Because the support members are also exposed to high temperatures and the same abrasive conditions as the tubes, it is desirable to protect support members from particulate impingement and increased heat which, over time, may lead to failure and cause the shield to separate from the tube thereby exposing the tube to the abrasive conditions.
  • Band clamps are generally comprised of a band having a free end and an opposing end having a buckle, or other member, for receiving the free end.
  • the band is wrapped about the tube and associated shield and the free end is placed within a buckle.
  • a powered or hand-operated tool is used to tension the band about the shield.
  • the buckle and band are interconnected or interlocked, and excess band length extending from the buckle is severed from the band at a point adjacent to the buckle.
  • the buckle is typically positioned behind the shielded tube away from the abrasive flow.
  • the interconnection between the band and the buckle is a prime yielding spot, and as such, it is desirable to place the interlocking portion of the band clamp in a location where it will be exposed to less heat and debris.
  • an operator or installer is instructed to position the buckle on the downstream side of the tube out of the direct path of particulate.
  • the size of the tubes and spacing between tubes often render it very difficult for an operator to properly locate the tensioning tool behind or on the downstream side of the shielded tube.
  • the cutting operation performed by existing tools is not very precise and the sharp severed portion of the band often injures installers as they try to tension nearby bands or work in the vicinity of these bands.
  • Band clamps of embodiments of the present invention include a free end and an opposing end, which includes a buckle for receiving and securing the band.
  • the band is wrapped at least once around a shield and tube and the free end is placed within the buckle. Transitioning and locking the band securely engages the shield in contacting relation to the tube so that efficient heat transfer can occur across the thickness of the shield and the tube.
  • the band clamp used in one embodiment of the present invention will provide a retained force of about 400-900 lbs. with a looped tensile force of about 1,750 lbs.
  • the protective guard used by some embodiments protects the band clamp from hot, high-speed, particulate-laden exhaust gasses.
  • the guard may be made of a material that is capable of withstanding temperatures up to about 880° F and which is similar to that of the band clamp so that efficient heat transfer to the tube and inner coolant will occur across the thickness of the guard and the band.
  • the guard is made of 310 stainless steel, carbon steel, inconel, or other similar material and is about 0.090 inches thick.
  • the material of manufacture, thickness, width, material properties, etc. of the guard may vary as a function of shield and band clamp size, material, etc.
  • the guard is made of a material that is easy to conform to the outer shape of the shield, i.e., bend into a curved shape, to facilitate engagement with a curved band clamp that is to be positioned about a shielded tube.
  • the guards may be pre-bent or otherwise formed.
  • the guard of some embodiments is adhered, bonded, or welded to, or otherwise interconnected to the band clamp.
  • the guard possesses openings that receive the free end of the band to facilitate interconnection of the band clamp and shield, which will be apparent upon review of the figures discussed below. In this way, it is ensured that the guard is correctly associated with the band clamps. It is another aspect of the present invention to provide a guard that is easy to install as band clamps are sometimes used in hard-to-access places.
  • the guard be able to accommodate band clamps of various types and/or sizes. More specifically, as the tubes used in heat recovery steam generators vary in size, so must the band clamps that secure the shields to the tubes. Accordingly, in another embodiment of this invention, the width of the guard is large enough that a variety of band clamps of different widths may be used and not exposed to abrasive material in the flow stream.
  • a commonly used tool employs a cutting member having an opening for receipt of the free end of the band. The opening is further defined by upper and lower cutting members that selectively move together to sever the band. After passing through the opening, the free end of the band is associated with a winding mandrel and tensioned. After a predetermined tension is reached, the cutting mechanism is used to sever and bend the band at a point adjacent to the buckle.
  • an automated tensioning tool employs a powered winding mandrel.
  • the tool is battery powered, but one of skill in the art will appreciate that the tool may receive the required power by way of a cord or be hydraulically driven.
  • the power source associated with the tool of one embodiment is a replaceable battery that allows for the installation of about 60 to 70 band clamps.
  • the mandrel is interconnected to a rotary shaft by way of a gearing system that ensures that the proper tension will be applied to the band.
  • the cutting mechanism of embodiments of the present invention extends laterally from the longitudinal axis of the mandrel as opposed to coaxial therewith. Initiation of mandrel winding is accomplished by depression of a button located on or near the hand grip. After the band reaches a predetermined tension, an easy- to-access cutter mechanism is used to sever the free end of the band.
  • the predetermined amount of tension may be controlled by a clutch that will slip, thereby preventing further tensioning, when a preset tension level is reached.
  • the cutter mechanism of some embodiments has the advantage of decreasing the amount of severed band extending from the buckle and thereby reducing exposure to the cut edge.
  • the gear box of embodiments of the present invention produces the required increase in torque.
  • It is another aspect of the present invention to provide a band tensioning and cutting tool comprising: a power source for providing rotational movement to a shaft; a gear box mechanically associated with the shaft; a rotating mandrel associated with the gear box wherein rotation of the shaft will rotate the mandrel, the mandrel adapted to receive a band and tension the same, the gear box having a means for preventing over tensioning the band; and a cutting mechanism positioned adjacent to the mandrel, the cutting mechanism also adapted to receive a portion of the band.
  • a band tensioning and cutting tool comprising: a drill having a rotating shaft; a gear box interconnected to the drill with an adapter, the gear box operatively associated with a winding mandrel such that rotation of the shaft rotates the mandrel, and a clutch that prevents over tensioning the band; and a cutting mechanism positioned adjacent to the mandrel, the cutting mechanism also adapted to receive a portion of the band.
  • an Ultra-Lok® band clamp which is described in U.S. Patent No. 6,014,792 (which is incorporated by reference herein), or similar band clamp is used to secure the shield to the tube.
  • the contemplated tool tensions the band to such a degree that even if the retained force decreases over time as a result of repeated heat cycles, the shield will remain securely engaged onto the tube.
  • the guarded band clamp of one embodiment will function for about 5 to 8 years.
  • the band tension provided by the band will overcome bent or deformed shields and force the shield to conform to the exterior shape of the shield and the tube. Such functionality ensures that the shield is in contact with the tube, thereby increasing heat transfer.
  • a ratcheting mechanism employs a toothed wheel that is rotatable in only one direction. Rotation in an opposite direction is prevented by interaction between the toothed wheel with a movable pawl.
  • the tool and associated gear box of embodiments of the present invention do not have such limitation because tensioning increments are very small or non-existent and are provided by a one way clutch bearing.
  • the system of one embodiment includes a band clamp, an associated guard, and a tool for tensioning the guarded band clamp about a shielded tube of a boiler.
  • the system of one embodiment of the present invention works with about 1 to 4 inch diameter tubes that are about 0.1 to 0.3 in. (about 3, 5, and 7 mm) thick that protect 180 degrees of the tube.
  • a combination band clamp and guard comprising: a band clamp comprised of a band having a buckle associated with one end and a free end; a guard having a first end and a second end, the first end of the guard located adjacent to the buckle and the second end spaced from the first end wherein the guard contacts at least a portion of the band.
  • It is still yet another aspect of the present invention to provide a method of shielding a tube comprising: providing a shield about at least a portion of the tube; providing a band clamp having a first free end and a second end having a buckle; providing a clamp guard interconnected to the band clamp; placing the band clamp and guard about the shield; placing the free end of the band into the buckle; and pulling the free end of the band relative to the buckle to tensioned band about the shield.
  • Fig. 1 is a partial perspective view showing a shield interconnected to a tube with a guarded band clamp
  • Fig. 2 is a front elevation view of Fig. 1;
  • Fig. 3 is a perspective view showing a guard incorporated on a band clamp
  • Fig. 4 is a front elevation view of a guarded band positioned about a shielded tube
  • Fig. 5 is a perspective view of the guard of one embodiment of the present invention
  • Fig. 6 is a front elevation view of Fig. 5;
  • Fig. 7 is a schematic of an automated band tensioning tool of one embodiment of the present invention.
  • Fig. 8 is a perspective view of an automated band tensioning tool of one embodiment of the present invention that employs a drill
  • Fig. 9 is a front elevation view of Fig. 8.
  • Fig. 10 is a perspective view showing portions of a plurality of shielded tubes as may be oriented in the exhaust path of a boiler with a tool of one embodiment positioned between adjacent tubes;
  • Fig. 11 is a top plan view of Fig. 10;
  • Fig. 12 is a cross-sectional of a gear box used in the embodiment of the present invention shown in Fig. 8;
  • Fig. 13 is an exploded perspective view of Fig. 12.
  • Figs 1 and 2 show a tube 2 associated with a boiler.
  • boiler tubes 2 may be oriented in a variety of positions, including vertical, horizontal, and in-between.
  • the tubes 2 are protected by shields 6 that are interconnected thereto by a plurality of band clamps 10 positioned at spaced intervals.
  • a buckle 14 and severed end 18 of the band clamps 10 are positioned downstream relative to the oncoming flow 22 of hot gases traveling through boiler.
  • the tubes 2 are spaced approximately 1.3 inches by 8 inches apart and thus interconnecting the band clamps 10 in the preferred matter is difficult.
  • a free end 64 of the band clamp 18 is placed in the buckle 14 and the band 42 is tensioned using a tool. After tensioning, the excess band is severed from the band and the guard 26 remains in place to protect the band clamp 10.
  • Figs. 3-7 show a band clamp 10 associated with a guard 26 of one embodiment of the present invention that has a first end 30 and a second end 34.
  • the band clamp 10 shown may be any type of band clamp comprising a band with interconnected buckle, or other means for interconnecting, known in the art.
  • Slots 38 are positioned adjacent to each end that are adapted to receive a band 42 of the band clamp 10. Further, the slots 38 may be located in a jog 44 or transition area of the guard 26.
  • the band 42 of the band clamp 10 is received within the slots 38 and positioned such that an outer surface 48 of the band 42 is abutted against the inner surface 52 of the guard 26.
  • the first end of the guard 30 is positioned adjacent to the buckle 14 of the band clamp 10, which helps maintain the guard 26 in place as the band clamp 10 is tensioned. Further, the guard is spot welded 56 or otherwise secured to the band, which ensures that the position of the guard relative to the buckle 14 is maintained during tensioning.
  • the guard 26 of one embodiment is curved to generally match the contour of the shield.
  • the guard 26 is resiliently deflected outwardly and engaged onto the shield 6.
  • the jogs 44 are designed to coincide with and engage the edges 60 of the shield 6, which maintains the position of the guard 26 on the shield 6. Further, as the weld 56 maintains the position of the buckle 14, relative to the shield, engagement of the jog 44 onto the edge 60 of the shield will locate the buckle 14 on the downstream side of the pipe and generally out of the flow stream.
  • Fig. 4 also shows that the band 42 of one embodiment has bent ends 64 and 68 that assist threading the band within the buckle 14 and tightening by hand before using a tool to perform the final tightening and complete the installation. More specifically, the bent end 64 allows the free end tip to pass thru the buckle 14 and not become obstructed by the jog 44. Further, the bent end 68 near the buckle 14, which is bent in an opposite direction from the free end 64, allows the band 42 to be pulled without digging into end 68, which reduces friction during installation.
  • an automated tensioning tool 100 of one embodiment of the present invention uses a rotary tensioning device, such as a drill 102 to rotate a winding mandrel 106.
  • the rotary tensioning device 102 is associated with a tool head 110 and winding mandrel 106 via a clutch 114, gear box 118, and bearing 122.
  • a conventional battery powered hand drill 102 is utilized.
  • the drill 102 is interconnected to a gear box 118 via an adapter 126.
  • the gear box 1 18 is interconnected to the drill 102 with the adapter 126 supporting the weight of the gear box 118.
  • the gear box 118 is also associated with a head 110 that includes the winding mandrel 106.
  • a portion of the wrapped band is placed through a front slot 130 or side slot 134 of a cutting mechanism 138 and then positioned within a slot 142 of the winding mandrel 106.
  • Actuation of a button or other switch directs the drill 102 to begin winding the band around the mandrel 106.
  • the a clutch associated with the gear box 118 ensures that the winding torque provided to the mandrel 106 does not over tighten or under tighten the band clamp.
  • an adjustable torque-limiting clutch associated with the gear box 118 slips and prevents over tensioning of the band.
  • the slipping clutch may make a noise to notify the operator that the proper amount of tension has been reached.
  • a cutter arm 150 is rotated to cause a blade 154 to sever the excess portion of the band.
  • the cutting mechanism may be automatic wherein after a predetermined tension is reached, the band is automatically severed. Alternatively, after tensioning is complete, the operator may actuate a button, for example, to cause the cutting mechanism to sever the band.
  • Figs. 10 and 11 are a representation of vertically-oriented tubes 2 of a boiler 160.
  • the tubes 2 may be positioned in most any orientation.
  • the tubes 2 are protected by shields 6 that are interconnected thereto by a plurality of spaced band clamps 10.
  • the buckle 14 and severed end 18 of the band clamps 10 are positioned downstream relative to the oncoming flow 22 of hot gases and particulate traveling through the boiler 160.
  • the tubes 2 are spaced approximately 1.3 inches apart and thus interconnecting the band clamps 10 in the preferred manner is difficult.
  • the gear box 118 of one embodiment of the present invention has an input shaft 170 that is associated with the drill.
  • the input shaft 170 is also associated with a planetary gear system 174 that provides the proper torsion to the winding mandrel.
  • the planetary gear system 174 is designed for high tension workloads wherein over 100 times the amount of torque that is input into the gear box 118 by the drill may be delivered to the mandrel 106.
  • the tool is able to provide about 1200 to 1500 lbs. of tension.
  • the tool of one embodiment of the invention uses a gear box commonly used in vehicle winches manufactured by Warn Industries.
  • the tool may employ a tension clutch bearing and a holding clutch bearing that holds the mandrel in place and prevents it from recoiling.
  • embodiments of the present invention is adapted to tension an about 3 mm thick by about 1.75 inch diameter half-moon mild steel shield to a tube.
  • embodiments of the present invention disclosed herein are battery operated and thus do not have cords or pneumatic air lines. Some embodiments of the present invention provide a maximum clamping force of about 690 lbs. It will also be apparent from the review of the figures that the band can be loaded into the tool by either threading it into the cutting mechanism 138 directly into the front slot 130 or side loaded through the side slot 134, which allows the tool to fit in the limited space available.
  • the mandrel 106 can accept the band regardless of tool grip 178 orientation.
  • the mandrel 106 of some embodiments employs at least two slots 142 for receiving the band.
  • the grip 178 can be positioned at three-o'clock or nine o'clock and the mandrel 106 can be selectively rotated to properly align a slot 142 to receive the band.
  • the band can be inserted sideways into the aligned slots 142, or the free end of the band can be threaded directly through cutting mechanism into the mandrel 106. Having the option of side to or direct loading allows operation in tight spaces. End loading also allows the band to be received at any point along the length of the band.
  • tools of embodiments of the present invention employ a removable cut off handle 150 wherein different cut off handles can be used depending on the work space.
  • the buckle of the band clamp is locked into place by the tool which prevents the buckle from slipping out of the blade during forming and band cutoff.
  • the cutting mechanism 138 is equipped with a feature that catches the buckle and will not allow the buckle to move away from the cutting mechanism during cutoff. The cutting mechanism pushes down on the buckle which forces the band down against the blade and a shear plate to sever the band. As the band is severed, the band also stretches which allows room for the buckle to move away from the blade and shear plate. The buckle catch on the cutting mechanism will not allow the buckle to move away from the blade and shear plate which improves cut-off. That is, the blade maintains proper alignment between the cutting planes of the blade and the buckle to perform cuts under no tension as a one-way bearing in the gear box will maintain band tension when winding is ceased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Clamps And Clips (AREA)
  • Supports For Pipes And Cables (AREA)

Abstract

La présente invention concerne un système de protection de tubes dans un système de récupération de chaleur. Ces tubes sont souvent protégés par un dispositif de protection fixé à ces derniers par plusieurs serre-joints à sangle. Chaque serre-joint à sangle est associé à un élément de protection le protégeant des gaz chauds se déplaçant à travers le champ de tubes. L'invention concerne en outre un outil automatisé servant à mettre sous tension les sangles autour des dispositifs de protection. L'outil automatisé permet aux serre-joints à sangle d'être correctement interconnectés aux dispositifs de protection d'une manière préférée.
PCT/US2011/051623 2010-09-14 2011-09-14 Élément de protection de serre-joint à sangle WO2012037273A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP11825887.0A EP2616355A1 (fr) 2010-09-14 2011-09-14 Élément de protection de serre-joint à sangle
CN2011800547111A CN103370262A (zh) 2010-09-14 2011-09-14 带式夹防护件

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US38283310P 2010-09-14 2010-09-14
US38283010P 2010-09-14 2010-09-14
US61/382,833 2010-09-14
US61/382,830 2010-09-14

Publications (1)

Publication Number Publication Date
WO2012037273A1 true WO2012037273A1 (fr) 2012-03-22

Family

ID=45805376

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2011/051623 WO2012037273A1 (fr) 2010-09-14 2011-09-14 Élément de protection de serre-joint à sangle
PCT/US2011/051620 WO2012037271A1 (fr) 2010-09-14 2011-09-14 Outil de mise sous tension de serre-joint à sangle

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/US2011/051620 WO2012037271A1 (fr) 2010-09-14 2011-09-14 Outil de mise sous tension de serre-joint à sangle

Country Status (4)

Country Link
US (2) US20120061061A1 (fr)
EP (1) EP2616355A1 (fr)
CN (1) CN103370262A (fr)
WO (2) WO2012037273A1 (fr)

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EP2406535B1 (fr) * 2009-03-11 2013-07-03 Avure Technologies AB Reservoir pour presse haute pression
US9789984B2 (en) 2012-07-05 2017-10-17 Golden Bear LLC Externally-powered strapping tool and a strapping tool assembly utilized therein
FR3008160B1 (fr) * 2013-07-03 2015-10-09 Caillau Ets Dispositif de serrage comprenant un collier et un manchon
PL405939A1 (pl) * 2013-11-06 2015-05-11 Centrum Badań Kosmicznych Polskiej Akademii Nauk Mechanizm zaciskowy, układ blokujący oraz sposób operowania manipulatorem rekonfigurowalnym
US11008125B2 (en) 2018-05-18 2021-05-18 Panduit Corp. Tool for tensioning metal locking ties
CN109621806A (zh) * 2018-12-26 2019-04-16 无锡银燕化工装备科技有限公司 立式真空捏合机

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US6065532A (en) * 1996-04-30 2000-05-23 American Megatteaux Corp. Boiler tube shield

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US4308648A (en) * 1980-03-31 1982-01-05 Murray Corporation Convoluted hose clamps
US4751769A (en) * 1987-10-06 1988-06-21 Sunbank Electronics, Inc. Band clamp with formable buckle
US5303571A (en) * 1991-09-06 1994-04-19 Band-It-Idex, Inc. Method of producing a one-piece band clamp
US6065532A (en) * 1996-04-30 2000-05-23 American Megatteaux Corp. Boiler tube shield
US6014792A (en) * 1998-10-20 2000-01-18 Band-It-Idex, Inc. Band clamp including band and separately attached buckle

Also Published As

Publication number Publication date
WO2012037271A1 (fr) 2012-03-22
US20120061061A1 (en) 2012-03-15
CN103370262A (zh) 2013-10-23
EP2616355A1 (fr) 2013-07-24
US20120060703A1 (en) 2012-03-15

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