TW201506237A - Hydraulic door closer assembly - Google Patents
Hydraulic door closer assembly Download PDFInfo
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- TW201506237A TW201506237A TW102129249A TW102129249A TW201506237A TW 201506237 A TW201506237 A TW 201506237A TW 102129249 A TW102129249 A TW 102129249A TW 102129249 A TW102129249 A TW 102129249A TW 201506237 A TW201506237 A TW 201506237A
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本發明係有關於一種關門器,尤指一種組成構件減少,製造成本降低之油壓關門器結構。 The present invention relates to a door closer, and more particularly to a hydraulic door closer structure in which component members are reduced and manufacturing costs are reduced.
按,一般建築物的大門在開啟或關閉時,為避免因為強大的衝擊力,造成門扇玻璃破裂或者組件損壞,常會在門軸的下方加裝一關門器,用來在開啟或關閉時產生阻力。而以往機械式產生阻力的關門器,其不像現有油壓式關門器,具有很大的調整範圍,所以無法適合各種場所的需求,在市場上正逐漸地被取代。 Press, when the door of the general building is opened or closed, in order to avoid the broken door glass or the component damage due to strong impact force, a door closer is often installed under the door shaft to generate resistance when opening or closing. . In the past, mechanically-closed door closers, unlike the existing hydraulic-type door closers, have a large adjustment range, so they cannot be adapted to the needs of various places and are gradually being replaced in the market.
如公告第M313712號「鉸鍊」,即為一種習知油壓關門器結構,包含:一本體、一被驅動單元、一連動單元、一活塞及油壓單元,該本體包括一組裝段及一腔室,該組裝段具有分別位於相反兩端的一近軸端部與一離軸端部,及一連接兩端部的圓筒部,該被驅動單元設置於該本體的近軸端部中,並包括一設置於該近軸底壁並具有一凹槽的承座、一設置於該凹槽中的聯結件、一介於該聯結件與承座之間並供該聯結件朝下穿設的下滑板、二設置於該下滑板上方的間隔柱、一位於該等間隔柱上方並供該聯結件朝上穿設的上滑板、二分別穿過該上滑板、間隔柱及下滑板並將上述元件固定一起的螺絲,及一位於該上滑板上方的培林,該連動單元 設置於該本體之腔室內並包括一具有一被驅動端部讓二螺絲固接於該下滑板的傳動件、一螺接於該傳動件另一端部並供該活塞連接的調整件,及一套設於該傳動件並兩端分別頂抵該被驅動端部與該調整件的彈性件,該活塞將該腔室區分成一主儲油段與一副儲油段,該油壓單元包括分別設置於該組裝段並連通該主儲油段的一第一入油孔與一高壓入油孔、一設置於該組裝段並連通該副儲油段的第一出油孔、一將該等油孔串連相通並供該主儲油段的油流入該副儲油段的第一油路,及一供該副儲油段的油流回該主儲油段的第二油路,其中,該高壓入油孔一流入壓力是大於該第一入油孔一流入壓力。 For example, the "hinge" of the publication No. M313712 is a conventional hydraulic door closer structure comprising: a body, a driven unit, a linkage unit, a piston and a hydraulic unit, the body comprising an assembly section and a cavity a unit having a proximal end portion and an off-axis end portion at opposite ends, and a cylindrical portion connecting the two end portions, the driven unit being disposed in the proximal end portion of the body, and The utility model comprises a socket disposed on the bottom wall of the paraxial shaft and having a groove, a coupling member disposed in the groove, a lower portion between the coupling member and the socket and the lowering of the coupling member downwardly a sliding plate, two spacers disposed above the lower sliding plate, an upper sliding plate disposed above the spacers and extending upwardly from the connecting member, and two through the upper sliding plate, the spacer column and the lower sliding plate respectively a screw fixed together, and a Palin located above the upper slide, the linkage unit The utility model is disposed in the chamber of the body and includes a transmission member having a driven end portion for fixing two screws to the lower sliding plate, an adjusting member screwed to the other end portion of the transmission member and connected to the piston, and a adjusting member The elastic member is disposed on the driving member and the two ends respectively abut against the driven end portion and the adjusting member, and the piston divides the chamber into a main oil storage section and a secondary oil storage section, wherein the hydraulic pressure unit comprises a first oil inlet hole and a high pressure oil inlet hole disposed in the assembly section and connected to the main oil storage section, a first oil outlet hole disposed in the assembly section and communicating with the auxiliary oil storage section, and the like The oil hole is connected in series and the oil of the main oil storage section flows into the first oil passage of the auxiliary oil storage section, and the oil for the auxiliary oil storage section flows back to the second oil passage of the main oil storage section, wherein The inflow pressure of the high pressure oil inlet hole is greater than the inflow pressure of the first oil inlet hole.
惟,該種習知油壓關門器結構,其被驅動單元包括一承 座、一聯結件、一下滑板、二間隔柱、一上滑板、複數螺絲及一培林,組成構件多,組裝麻煩不便,並且其連動單元需設置一具有一被驅動端部讓二螺絲固接於被驅動單元的傳動件,及一套設於該傳動件的彈性件,故整體結構複雜,製造成本高,不符經濟效益。 However, the conventional hydraulic pressure closer structure has a driven unit including a bearing The seat, the connecting piece, the lower sliding plate, the two spacer columns, an upper sliding plate, a plurality of screws and a Palin have many components and are inconvenient to assemble, and the linking unit needs to be provided with a driven end portion for fixing the two screws. The transmission member of the driven unit and a set of elastic members disposed on the transmission member have a complicated overall structure and high manufacturing cost, which is not economical.
本發明人有鑑於上述習知油壓關門器結構,具有組成構件多,製造成本高的缺點,是以乃思及設計的意念,經多方探討與試作樣品試驗,及多次修正改良後,終推出本發明。 The present inventors have the disadvantages of the above-mentioned conventional hydraulic door closer structure, which have many components and high manufacturing cost, and are based on the idea of designing and testing, and after multiple trials and trials, and after many corrections and improvements, The present invention has been introduced.
本發明提供一種油壓關門器結構,包含:一基座、一活塞、一轉軸單元、一封閉單元、一彈性件及一調節閥,其中該基座係長形中空狀,內部具有一腔室,該活塞係組設於基座之腔室中段,將基座之腔室分隔成充滿油液之一第一腔室與一第二腔室,該基座一端之頂面設有一 第一開口與該第一腔室相通,相對端之端面設有一第二開口與該第二腔室相通,又該基座一側設有一回流通道連通該第一腔室與第二腔室,該活塞往基座之第一腔室方向設有一樞接部樞設一轉輪,另該活塞內部設有一具逆止功能之通孔連通基座之第一腔室與第二腔室,該轉軸單元包括一承座、一軸桿、一封閉板及一軸承,可旋轉的組設於基座之第一腔室內與活塞之轉輪靠抵,且該轉軸單元突出一段於該基座之頂面連接一門扇,而可受開門的推力作用產生旋轉,該封閉單元係組設於基座之第二開口封閉,該彈性件係組設於基座之第二腔室內,並彈抵於活塞與封閉單元間,該調節閥係組設於基座上,用以調整回流通道之流通截面積。 The present invention provides a hydraulic door closer structure comprising: a base, a piston, a shaft unit, a closed unit, an elastic member and a regulating valve, wherein the base is elongated and hollow, and has a chamber inside. The piston system is disposed in a middle portion of the chamber of the base, and the chamber of the base is divided into a first chamber filled with oil and a second chamber, and a top surface of one end of the base is provided with a The first opening is in communication with the first chamber, the second end of the opposite end is provided with a second opening, and the second side of the base is provided with a return channel communicating with the first chamber and the second chamber. The piston is provided with a pivoting portion pivoting a rotating wheel toward the first chamber of the base, and the piston is internally provided with a backing function connecting the first chamber and the second chamber of the base. The rotating shaft unit comprises a bearing seat, a shaft rod, a closing plate and a bearing, and the rotating unit is arranged in the first chamber of the base to abut against the rotating wheel of the piston, and the rotating shaft unit protrudes at a top of the base The surface is connected to a fan, and the rotation of the door can be rotated. The closed unit is closed in the second opening of the base, and the elastic member is assembled in the second chamber of the base and is springed against the piston. The adjusting valve is disposed on the base to adjust the flow cross-sectional area of the return passage.
本發明之主要目的,在於其轉軸單元包括一承座、一軸桿、一封閉板及一軸承,組成構件少,組裝簡易方便,並且其不需設置傳動件,因而整體結構簡單,製造成本降低,符合經濟效益。 The main purpose of the invention is that the shaft unit comprises a bearing seat, a shaft rod, a closing plate and a bearing, the component is few, the assembly is simple and convenient, and the transmission member is not required, so that the overall structure is simple and the manufacturing cost is reduced. It is economical.
本發明之次一目的,在於其整體結構簡單,故障率低,使用壽命長。 The second object of the present invention is that the overall structure is simple, the failure rate is low, and the service life is long.
1‧‧‧基座 1‧‧‧Base
11‧‧‧第一端 11‧‧‧ first end
12‧‧‧第二端 12‧‧‧ second end
13‧‧‧腔室 13‧‧‧ chamber
131‧‧‧第一腔室 131‧‧‧First chamber
132‧‧‧第二腔室 132‧‧‧Second chamber
14‧‧‧第一開口 14‧‧‧First opening
15‧‧‧第二開口 15‧‧‧second opening
16‧‧‧回流通道 16‧‧‧Return channel
17‧‧‧閥室 17‧‧‧Valve room
2‧‧‧活塞 2‧‧‧Piston
21‧‧‧樞接部 21‧‧‧ pivotal department
22‧‧‧轉輪 22‧‧‧Runner
221‧‧‧唇緣 221‧‧‧ lip
23‧‧‧通孔 23‧‧‧through hole
231‧‧‧逆止元件 231‧‧‧Backstop components
3‧‧‧轉軸單元 3‧‧‧ shaft unit
31‧‧‧承座 31‧‧‧ 承座
311‧‧‧承孔 311‧‧‧ hole
32‧‧‧軸桿 32‧‧‧ shaft
321‧‧‧下軸柱 321‧‧‧ lower shaft column
322‧‧‧上軸柱 322‧‧‧Upper shaft column
323‧‧‧連接柱 323‧‧‧Connecting column
324‧‧‧凸輪板 324‧‧‧Cam plate
33‧‧‧封閉板 33‧‧‧Closed board
331‧‧‧穿孔 331‧‧‧Perforation
332‧‧‧封閉環 332‧‧‧ Closed ring
34‧‧‧軸承 34‧‧‧ bearing
4‧‧‧封閉單元 4‧‧‧Closed unit
41‧‧‧封閉蓋 41‧‧‧Closed cover
42‧‧‧C型扣環 42‧‧‧C type buckle
5‧‧‧彈性件 5‧‧‧Flexible parts
6‧‧‧調節閥 6‧‧‧Regulator
第一圖係本發明之立體分解圖。 The first figure is a perspective exploded view of the present invention.
第二圖係本發明之外觀立體圖。 The second drawing is a perspective view of the appearance of the present invention.
第三圖係第二圖沿A-A線剖面圖。 The third figure is a cross-sectional view taken along line A-A of the second figure.
第四圖係第二圖沿B-B線剖面。 The fourth figure is the second figure along the line B-B.
第五圖係本發明連接於一門扇且該門扇開啟進行動作之剖面示意圖。 The fifth figure is a schematic cross-sectional view of the invention connected to a door fan and the door is opened for operation.
第六圖係本發明連接於一門扇且該門扇進行關閉動作之剖面示意圖。 The sixth figure is a schematic cross-sectional view of the invention connected to a door fan and the door leaf is closed.
第七圖係本發明另一實施例之轉輪立體圖。 Figure 7 is a perspective view of a wheel of another embodiment of the present invention.
第八圖係本發明另一實施例之剖面圖。 Figure 8 is a cross-sectional view showing another embodiment of the present invention.
請參閱第一圖、第二圖、第三圖及第四圖,本發明係提供一種油壓關門器結構,包含:一基座1、一活塞2、一轉軸單元3、一封閉單元4、一彈性件5及一調節閥6,其中該基座1係長形中空狀,具有相對之一第一端11及一第二端12,基座1內部具有一腔室13,該活塞2係組設於基座1之腔室13中段,將基座1之腔室13分隔成充滿油液之一第一腔室131與一第二腔室132,該基座1第一端之頂面設有一第一開口14與該第一腔室131相通,該基座1第二端之端面設有一第二開口15與該第二腔室132相通,又該基座1一側設有一回流通道16連通該第一腔室131與第二腔室132,該基座1頂面往下設置一閥室17與該回流通道16相通,該活塞2係卡抵於基座1之腔室13中段形成單向定位,該活塞2往基座1之第一腔室131方向設有一樞接部21樞設一轉輪22,該轉輪22為圓輪狀,底端設有一擴大狀唇緣221,另該活塞2內部設有一通孔23連通基座1之第一腔室131與第二腔室132,於該通孔23內裝設有一逆止元件231(本實施例該逆止元件231為一鋼珠),使該通孔23具有逆止功能,令第二腔室132的油液得以由該通孔23流至第一腔室131,而第一腔室131的油液無法由該通孔23流至第二腔室132,該轉軸單元3組設於基座1之第一腔室131內,包括一承座31、一軸桿32、一封閉板33及一軸承34,該承座31係設置於基座1之第一腔室131底部,中心部位設有 一承孔311,該轉軸32下端設置一下軸柱321插設於該承座31的承孔311內,該轉軸32上端一上軸柱322,該上軸柱322上側設置一用以與門扇連接之連接柱323,該上軸柱322與下軸柱321間設置一凸輪板324與活塞2之轉輪22靠抵,並跨置於轉輪22之擴大狀唇緣221上,該封閉板33係固結於基座1之第一開口14蓋合封閉,該封閉板33中心部位設有一穿孔331供轉軸32之上軸柱322穿設,使轉軸32之連接柱323突出於基座1之頂面連接一門扇(圖中未示),而可受開門的推力作用產生旋轉,該穿孔331內緣套設有一封閉環332與轉軸32之上軸柱322周緣面迫緣形成封閉狀態,該軸承34係裝設於封閉板33之穿孔311內,並套設於轉軸32之上軸柱322周緣面,配合承座31使轉軸32在旋轉時穩定保持準確位置,該封閉單元4包括一封閉蓋41及一C型扣環42,組設於基座1之第二開口15封閉,該彈性件5係組設於基座1之第二腔室132內,並彈抵於活塞2與封閉單元4間,該調節閥6係組設於基座1之閥室17內,用以調整回流通道16之流通截面積。 Referring to the first, second, third and fourth figures, the present invention provides a hydraulic door closer structure comprising: a base 1, a piston 2, a shaft unit 3, a closed unit 4, An elastic member 5 and a regulating valve 6, wherein the base 1 is elongated and hollow, has a first end 11 and a second end 12, and the base 1 has a chamber 13 therein. The chamber 13 of the base 1 is partitioned into a first chamber 131 filled with oil and a second chamber 132. The top surface of the first end of the base 1 is disposed. A first opening 14 is communicated with the first chamber 131. The second end of the second end of the base 1 is provided with a second opening 15 communicating with the second chamber 132. The first chamber 131 and the second chamber 132 are connected to each other. A valve chamber 17 is disposed on the top surface of the base 1 to communicate with the return passage 16. The piston 2 is engaged with the middle portion of the chamber 13 of the base 1. The unidirectional positioning of the piston 2 is provided with a pivoting portion 21 in the direction of the first chamber 131 of the base 1 and a pivoting wheel 22 is disposed. The rotating wheel 22 has a round wheel shape, and the bottom end is provided with an enlarged lip 221 . another A through hole 23 is disposed in the piston 2 to communicate with the first chamber 131 and the second chamber 132 of the base 1. A backstop element 231 is disposed in the through hole 23 (the backstop element 231 is a steel ball in this embodiment) The through hole 23 has a reverse function, so that the oil of the second chamber 132 can flow from the through hole 23 to the first chamber 131, and the oil of the first chamber 131 cannot be passed through the through hole 23 Flowing to the second chamber 132, the shaft unit 3 is disposed in the first chamber 131 of the base 1, and includes a socket 31, a shaft 32, a closing plate 33 and a bearing 34. It is disposed at the bottom of the first chamber 131 of the base 1, and is provided at the center A bearing hole 311 is disposed in the lower end of the rotating shaft 32. The shaft post 321 is inserted into the bearing hole 311 of the bearing block 31. The upper end of the rotating shaft 32 is an upper shaft post 322, and the upper side of the upper shaft post 322 is disposed to be connected with the door leaf. a connecting post 323, a cam plate 324 is disposed between the upper shaft post 322 and the lower shaft post 321 to abut the rotating wheel 22 of the piston 2, and is disposed on the enlarged lip 221 of the rotating wheel 22, the closing plate 33 The first opening 14 of the base 1 is closed and closed. A central portion of the closing plate 33 is provided with a through hole 331 for the shaft post 322 of the rotating shaft 32 to pass through, so that the connecting post 323 of the rotating shaft 32 protrudes from the base 1. The top surface is connected to a door fan (not shown), and can be rotated by the pushing action of the opening door. The inner edge of the through hole 331 is sleeved with a closed loop 332 and a peripheral edge of the shaft post 322 on the rotating shaft 32 to form a closed state. The bearing 34 is mounted in the through hole 311 of the closing plate 33 and sleeved on the peripheral surface of the shaft post 322 of the rotating shaft 32. The bearing seat 31 is used to stably maintain the accurate position of the rotating shaft 32 when rotating. The closing unit 4 includes a closed portion. The cover 41 and the C-shaped buckle 42 are closed on the second opening 15 of the base 1 , and the elastic member 5 is assembled on the base 1 The second chamber 132, and injected against the piston 2 and the closure unit 4, the control valve 6 based group provided in the 17 the valve chamber base of 1, for adjusting the flow cross-sectional area of the return passage 16 of the.
當連接油壓關門器之門扇開啟時,如第五圖所示,門扇會 帶動轉軸32旋轉,使轉軸32之凸輪板324往基座1第二端12方向推頂活塞2之轉輪22,帶動活塞2往基座1第二端12方向位移,使彈性件5隨著活塞2之位移而壓縮,此時基座1第二腔室132內的部分油液會流經活塞2之通孔23,推開通孔23內的逆止元件23,而流至基座1之第一腔室131內。 When the door leaf connected to the hydraulic door closer is opened, as shown in the fifth figure, the door leaf will The rotation of the rotating shaft 32 causes the cam plate 324 of the rotating shaft 32 to push the rotating wheel 22 of the piston 2 toward the second end 12 of the base 1 to drive the piston 2 to the second end 12 of the base 1 so that the elastic member 5 follows The displacement of the piston 2 is compressed, and at this time, part of the oil in the second chamber 132 of the susceptor 1 flows through the through hole 23 of the piston 2, pushing the backstop member 23 in the through hole 23, and flowing to the pedestal 1 Inside the first chamber 131.
另當門扇開啟所受到的力量消失時,如第六圖所示,活塞 2會受到彈性件5的彈力往基座1第一端11方向推頂位移,此時因第一腔室131內油液的壓力比第二腔室132內油液的壓力大,故活塞2通孔23內的逆止元件23便被推擠塞住通孔23,而形成逆止作用,使第一腔室131內的油液必須經由基座1的回流通道16流回至第二腔室132,並且由於該回流通道16之孔徑有限,故可產生緩衝之阻力,使門扇自動並以和緩的速度自動關門,又可依需要操作調節閥6調整回流通道16之流通截面積,而利用流通截面積愈小油液的回流速度愈慢,流通截面積愈大油液的回流速度愈快,來調整控制門扇自動關門的關閉速度。 In addition, when the force of the door opening is lost, as shown in the sixth figure, the piston 2, the elastic force of the elastic member 5 is pushed to the top end 11 of the base 1 to be displaced. At this time, since the pressure of the oil in the first chamber 131 is greater than the pressure of the oil in the second chamber 132, the piston 2 The backstop element 23 in the through hole 23 is pushed and plugged into the through hole 23 to form a backstop action, so that the oil in the first chamber 131 must flow back to the second chamber through the return passage 16 of the base 1. The chamber 132, and because the aperture of the return passage 16 is limited, the cushioning resistance can be generated, the door leaf can be automatically closed at a gentle speed, and the regulating valve 6 can be operated as needed to adjust the flow cross-sectional area of the return passage 16 to be utilized. The smaller the cross-sectional area of the flow, the slower the return flow rate of the oil. The larger the cross-sectional area of the flow, the faster the return flow rate of the oil, to adjust the closing speed of the automatic closing of the door leaf.
再者,本發明油壓關門器結構,其活塞2之轉輪22除如 上述為圓輪狀,底端設有一擴大狀唇緣221外,亦可如第七圖及第八圖所示,設置為底端無擴大狀唇緣之圓輪狀,而以該底端無擴大狀唇緣之轉輪22與轉軸單元3之凸軸板324靠抵,當連接油壓關門器之門扇開啟時,由門扇帶動轉軸32旋轉,使轉軸32之凸輪板324往基座1第二端12方向推頂活塞2之轉輪22,帶動活塞2往基座1第二端12方向位移。 Furthermore, in the hydraulic door closer structure of the present invention, the runner 22 of the piston 2 is divided The above is a round wheel shape, and the bottom end is provided with an enlarged lip 221, and as shown in the seventh and eighth figures, the bottom end is provided with a round shape without an enlarged lip, and the bottom end is not The enlarged lip 22 and the convex shaft 324 of the rotating shaft unit 3 abut against each other. When the door fan connected to the hydraulic door closer is opened, the door shaft rotates the rotating shaft 32 to rotate the cam plate 324 of the rotating shaft 32 to the base 1 The runner 22 of the top end 12 pushes the piston 2 to drive the piston 2 to the second end 12 of the base 1.
由上述具體實施例之結構,可得到下述之效益: From the structure of the above specific embodiment, the following benefits can be obtained:
1.本發明油壓關門器結構,其轉軸單元3包括一承座3 1、一軸桿32、一封閉板33及一軸承34,組成構件少,組裝簡易方便,並且其不需設置傳動件,因而整體結構簡單,製造成本降低,符合經濟效益,而可使產品更具競爭力。 1. The hydraulic pressure closer structure of the present invention, the shaft unit 3 comprises a socket 3 1. A shaft 32, a closing plate 33 and a bearing 34 have fewer components, are simple and convenient to assemble, and do not need to be provided with a transmission member, so that the overall structure is simple, the manufacturing cost is reduced, and the economical efficiency is achieved, and the product can be more Competitiveness.
2.本發明油壓關門器結構,其整體結構簡單,故障率低, 而可達到更佳之實用性及延長使用壽命。 2. The structure of the hydraulic pressure closer device of the invention has simple overall structure and low failure rate. It can achieve better practicality and extend the service life.
1‧‧‧基座 1‧‧‧Base
11‧‧‧第一端 11‧‧‧ first end
12‧‧‧第二端 12‧‧‧ second end
13‧‧‧腔室 13‧‧‧ chamber
14‧‧‧第一開口 14‧‧‧First opening
15‧‧‧第二開口 15‧‧‧second opening
17‧‧‧閥室 17‧‧‧Valve room
2‧‧‧活塞 2‧‧‧Piston
21‧‧‧樞接部 21‧‧‧ pivotal department
22‧‧‧轉輪 22‧‧‧Runner
221‧‧‧唇緣 221‧‧‧ lip
23‧‧‧通孔 23‧‧‧through hole
231‧‧‧逆止元件 231‧‧‧Backstop components
3‧‧‧轉軸單元 3‧‧‧ shaft unit
31‧‧‧承座 31‧‧‧ 承座
311‧‧‧承孔 311‧‧‧ hole
32‧‧‧軸桿 32‧‧‧ shaft
321‧‧‧下軸柱 321‧‧‧ lower shaft column
322‧‧‧上軸柱 322‧‧‧Upper shaft column
323‧‧‧連接柱 323‧‧‧Connecting column
324‧‧‧凸輪板 324‧‧‧Cam plate
33‧‧‧封閉板 33‧‧‧Closed board
331‧‧‧穿孔 331‧‧‧Perforation
332‧‧‧封閉環 332‧‧‧ Closed ring
34‧‧‧軸承 34‧‧‧ bearing
4‧‧‧封閉單元 4‧‧‧Closed unit
41‧‧‧封閉蓋 41‧‧‧Closed cover
42‧‧‧C型扣環 42‧‧‧C type buckle
5‧‧‧彈性件 5‧‧‧Flexible parts
6‧‧‧調節閥 6‧‧‧Regulator
Claims (9)
Priority Applications (1)
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TW102129249A TWI522523B (en) | 2013-08-15 | 2013-08-15 | Hydraulic door closer assembly |
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TW102129249A TWI522523B (en) | 2013-08-15 | 2013-08-15 | Hydraulic door closer assembly |
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TW201506237A true TW201506237A (en) | 2015-02-16 |
TWI522523B TWI522523B (en) | 2016-02-21 |
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