baber/WOPTO huggingface dataset:
Patent KR-20000029750-A (KR)
Title: Robust golf navigation system
Inventor: COFFEE JOHN R
IPC: A63B55/60
Filed: 1997-07-30
Abstract: PURPOSE: A robust golf navigation system is provided to relatively accurately measure the distance of a golf ball to a golf cup, a hazard, or other feature on a hole of a golf course for the purpose of assisting a golfer in playing the hole. CONSTITUTION: A method for accurate measurement in a golf consists of the step of; positioning a dead reckoning navigation (DRN) system installed on a golf cart(15) adjacent a tee box of a hole to be played on the course, as an origin of coordinates for the position of the DRN system; repositioning DRN system adjacent the new position of the ball given from a shot after a tee shot; determining the coordinates for the new position of the ball relative to the origin from the DRN system in order to calculate distance from the new position coordinates to the cup in use of the new position coordinates relative to the known distance between the tee box from which the tee shot took place and the cup for the hole being played as the DRN system is being repositioned; calibrating the DRN system to restore accuracy of measurements by substantially removing error buildup from the determination and calculation at some point during play of the course. The cart (15) may be adapted to communicate with a satellite navigation system such as a global positioning system (14), and to be calibrated using differential GPS (DGPS) information, with Kalman filter processing. The cart based DRN system has at least one front wheel sensor and a floated or fixed compass, for measuring wheel speed and magnetic heading of the cart, for use in calculating position of the cart on the course.
Patent KR-20010029478-A (KR)
Title: 분사 장치
IPC: F02M21/02
Filed: 1997-09-05
Abstract: 본 발명은 분사기(3)에서 분사되는 동안 기화되는 LPG와 같은 액체 연료용의 분사기(3)에 관한 것이다.  그와 같은 분사기의 출구관(5)의 출구 개방부에서 얼음이 형성될 만큼의 저온이 내연 기관의 입구 덕트에서 발생하지 않게 하기 위해, 출구관(9) 자체는 열전도성 재료로 둘러싸인 단열재로 제조되는 것이 제안된다.  이 용기는 슬리브(11) 형태일 수 있다.
Patent KR-20000053324-A (KR)
Title: Flame retarding composition without halogen, flame retarding yarn made therefrom, and flame retarding textile structure containing such yarn
Inventor: BROUTIER ISABELLE
IPC: D06M11/72
Filed: 1997-11-17
Abstract: PURPOSE: Flame retarding composition without halogen, flame retarding yarn made therefrom, and flame retarding textile structure containing such yarn are provided. CONSTITUTION: An invention concerns a flame retarding composition without halogen to be applied on a substrate, comprising a polymer binder for binding the flame retarding composition to the substrate, and at least a flame retarding agent, the flame retarding agents forming an intumescent system comprising an acid source agent, and a carbon source agent, excluding a supplementary generator of expanding gas, the weight ratio between the acid source agent and the carbon source agent being 1.85. The invention also concerns yarn made fireproof by application of the flame retarding composition, and textile structures comprising such fireproof yarn.
Patent KR-20010049164-A (KR)
Title: 전기 케이블용 조성물
IPC: H01B7/28
Filed: 1998-01-09
Abstract: 본 발명은 전기 케이블용 조성물에 관한 것이다.  본 발명의 조성물은 하기 화학식 (I)의 (폴리)알킬렌 글리콜 모노(메트)아크릴레이트를 포함하는 에틸렌 공중합체를 포함한다.  본 발명의 조성물은 전기 케이블의 절연층 또는 반도전층으로서 사용될 수 있다. 
     
       
     
     상기 식에서, 
     R 1 은 H 또는 CH 3 이고, 
     R 2 는 H 또는 CH 3 이고, 
     n은 1 내지 20이다.
Patent KR-20010012342-A (KR)
Title: 굴절율이 높은 단량체
IPC: C08F20/22
Filed: 1997-09-09
Abstract: 본 발명은 굴절율이 1.55 이상인 알킬 치환되고 브롬화된 방향족 에스테르(메트)아크릴레이트 단량체에 관한 것이다.
Patent KR-20010012983-A (KR)
Title: 진폭 변조 질 검출기
IPC: H04B1/10
Filed: 1999-03-08
Abstract: AM 주파수 대역의 자동 주사동안 주사는 사용할 수 있는 오디오 신호가 수신될 때만 중단하는 것을 필요로 한다. 이를 정상적으로 달성하기 위하여 수신기는 수신된 신호의 (RF) 신호 레벨과 IF 주파수를 검사한다. 밤에 AM 신호들의 전파가 기상 상태의 결과로 개선되기 때문에 같은 송신 주파수를 갖는 멀리 떨어진 스테이션이 국부 스테이션을 간섭하는 것이 가능하다. 이를 극복하기 위해서 검출기와 수신기가 제안되고, 그것에 의해 검출기는 2개 또는 그 이상의 스테이션들의 간섭들을 검출하고 다음 스테이션에 대해 주사를 다시 시작하도록 검출 신호를 공급한다.
Patent KR-20000018006-A (KR)
Title: Analog/Digital OSD Mux
Inventor: PARK HEUNG MU
IPC: H04N5/445
Filed: 2000-01-04
Abstract: PURPOSE: A method is provided to make an analog on screen display and a digital on screen display expressed by the same color and by the same menu format. CONSTITUTION: In method for mixing two video signals which have different synchronous from each other, the color information between the two signals is mixed. Each video signal is outputted by an analog component method. The video signals thus mixed is converted into a composite signal through a video encoder (CD), and the composite signal is required in a television.
Patent KR-20010077120-A (KR)
Title: Apparatus for controlling remotely both mobile phone and music replay, and method therefor
Inventor: MUN JI UK
IPC: H04B1/38
Filed: 2000-01-31
Abstract: PURPOSE: A remote control for mobile telephone call and playing of music and a method of operating the remote control are provided which has a function of reproducing MP3 music files and is connected to a mobile telephone to perform mobile communication performance. CONSTITUTION: A remote control(210) that has a function of reproducing MP3 music files and is connected to a mobile telephone to perform mobile communication performance includes an input unit(211) for selecting a music play mode or communication mode and selecting a music, and a storage unit(212) for storing music information. The remote control further has a controller(214) for controlling display of the music information and mobile communication information related with transmission and reception of the mobile telephone and reading the music information stored in the storage unit or controlling the transmission and reception of the mobile telephone. The remote control also has a display(213) for displaying the music information and the title of music currently being played and displaying the mobile communication information, and a music reproducing unit(215) for reproducing the music information transmitted from the controller. The remote control further includes a sound output unit(216) for outputting the music reproduced by the music reproducing unit or outputting a voice signal received by the mobile telephone, a sound input unit(217) for receiving the voice of a user to transmit the voice to the mobile telephone, and a switch(218) for switching the music reproduced to the sound output unit, switching the voice signal sent from the mobile telephone to the sound output unit and switching the voice signal received by the sound input unit to the mobile telephone.
Patent KR-20000076579-A (KR)
Title: 세라믹 이온 수송막용의 혼합된 전도성 입방형페로브스카이트
IPC: B01J37/02
Filed: 2000-02-01
Abstract: 본 발명의 산소 분리 장치용 세라믹막 요소는 하기 화학식으로 나타내어지는 세라믹 물질로부터 형성된다: 
     A 1-x A' x B 1-y B' y O 3-z   
     상기 식에서, 
     A는 란탄 계열 원소이고; A'은 적합한 란탄 계열 원소의 도펀트(dopant)이고; B는 티탄, 바나듐, 크롬, 망간, 철, 코발트, 니켈 및 아연 및 이들의 혼합물로 구성된 군으로부터 선택되고; B'는 구리이고; x는 0.4 내지 0.8이고; y는 0.1 내지 0.9이고; z는 0보다 크며, 화학량론적으로 결정된다.  B가 0.1보다 많은 양의 코발트를 포함하는 경우에, 철의 함량은 0.05 미만이다.  본 발명의 세라믹막 요소는 비교적 저온에서 이를 통해 산소 이온을 선택적으로 수송하고, 플럭스는 약 600℃에서 검출된다.  이렇게 함으로써, 산소 분리 장치는 종종 900℃를 초과하는 작동 온도를 갖는 통상의 분리 장치 보다 낮은 온도에서 작동될 수 있다.  기계적인 안정성은 세라믹에 제 2 상을 첨가함으로써 증대될 수 있다.
Patent KR-20010081752-A (KR)
Title: Test apparatus for semiconductor device
Inventor: KWON JAE HYEON
IPC: G11C29/00
Filed: 2000-02-18
Abstract: PURPOSE: A semiconductor device tester is provided to reduce the test time of memory devices by allowing different data to be written into a neighboring cell of cells simultaneously driven by a single decoder signal. CONSTITUTION: The test apparatus includes a plurality of input/output pads for outputting four pairs of signals, respectively, and an input/output sense amplifier(31) and a write driver(11) each for outputting a gdb signal and a gdb_b signal depending on the output signal of the input/output pads. First and second pass gate to which the output signal, gdb_s signal, of the write driver is inputted, are connected in a vertical direction. Third and fourth pass gate to which the output signal, gdb_b_s signal, of the input/output sense amplifier is inputted, are connected in a vertical direction. An inverter inverts a signal tm_dqcom into input/output pad compress mode to supply it to an NMOS' side gate of the first pass gate, a PMOS' side gate of the fourth pass gate and the second and third pass gate. A bit line sense amplifier(60) receives the gdb_s signal from the output terminals of the first and fourth pass gates and a gdb_b_e from the output terminals of the second and third pass gates, as an input.
Patent KR-20000036391-A (KR)
Inventor: PARK JONG UK
IPC: G11C16/00
Filed: 2000-03-04
Abstract: PURPOSE: A non-volatile semiconductor memory device is provided to reduce a time for verifying an over erase by simultaneously performing a verification of over erase for cells connected in one bit line inside a sector when the over erase of the semiconductor memory device having a NOR-formed memory cell structure is verified. CONSTITUTION: In entering a repairing operation of over erase, every row addresses are set to '0'(70). After every word lines of selected sector are enabled(71), a reading operation for verifying the over erase(72) and an existence of over erase is decided based on the read data(73). Theses operations are repeated to the next row if there is not the cell of over erase. In existing a cell of over erase, only a first row address inside a sector is enabled(74) and a counter to decide a number of soft program is reset to '0'(75). The over erase about the first line in the first row is read(76) and the soft program is performed if the over erase is performed(78). If there is not the cell of over erase, the operation is repeated to the next row. If the over erase is performed by reading the over erase after the operation(78), the process of soft program is repeated as the decided number of soft program(78.79.7-1.7-6.7-5).
Patent KR-20010087583-A (KR)
Title: direct connecting instant humidifier
Inventor: KIM HO SUNG
IPC: F24F6/00
Filed: 2000-03-07
Abstract: PURPOSE: An instant humidifier to be connected to a water supply system directly is provided to omit the water storage tank and use flowing water by the direct connection with the water supply and instantly evaporating the water to vapor, thereby resolving the problems of the propagation of gems and minimizing the humidifier. CONSTITUTION: In an instant humidifier to be connected to a water supply system directly, a heating coil attached to an evaporator supporting die(3) for heating an evaporator(6) to a proper temperature, an automatic valve(11) directly connected to a water supply tube(15) of the water supply is opened to spraying water to be instantly evaporated by the evaporator, and a blower(8) mounted in the vicinity of a suction hole of the evaporator inhales the vapor to spray via a blowing duct(9) and vapor spraying holes of a cover(10).
Patent KR-20010092909-A (KR)
Title: Indirectly heated cathode assembly
Inventor: AHN JI HUN
IPC: H01J1/13
Filed: 2000-03-27
Abstract: PURPOSE: An indirectly heated cathode structure is provided to prevent current leakage between the heater and cathode even at a high temperature of 1000°C or higher. CONSTITUTION: An indirectly heated cathode structure comprises an electron emission member(21) for emitting thermal electron when heated; a base metal(22) including a fixed portion(22a) where the electron emission member is mounted, and a skirt portion(22b) extended downward from an edge of the fixed portion; a heater(23) incorporated into the base metal, and which has a ZrO2 or BeO insulation layer(23a) formed at the outer periphery of the heater; and a support member(24) for supporting the heater. It is possible to use a metallic cathode as the electron emission member.
Patent KR-20010090218-A (KR)
Inventor: RYU JANG WOOK
Filed: 2000-03-23
Abstract: PURPOSE: A system for reading bar-code issued airplane, express way and gift certificate ticket with bar-code on internet is provided to increase the convenience of a user by enabling the user to freely pass through an expressway tollgate without traffic tie-up time, thereby providing the efficiency of expressway operation. CONSTITUTION: In case that a user who wants to use an expressway is previously authenticated after paying a toll using a related institution internet homepage or an operator internet system, a ticket with a built-in identification record in a designated bar code is printed by a magnetic printer and attached to the side of the user's vehicle. In case that the user wants to pass through an express tollgate, the user can go through a free pass zone in which a bar code recognition device is installed. The identical bar code is copied and provided to another vehicles. In case that the bar code in which the same identification contents are recorded is repeatedly passed, a recognition program automatically judges whether the bar code and imposes a fine on a vehicle attaching the same bar code.
Patent KR-20010094138-A (KR)
Title: A real-time transaction method and system via a chatting in an electronic commercial transaction
Inventor: PARK YONG SOON
Filed: 2000-04-04
Abstract: PURPOSE: A method and system for a real time transaction through a chatting in an electronic commerce is provided to enable a seller and a buyer to perform a real time transaction at on-line by connecting an electronic commerce to a real time chatting function. CONSTITUTION: A seller connects to an electronic commerce system and checks whether a commodity to be sold is registered in a database. If the commodity is not registered in a database, the seller registers the commodity(201). A chatting window is opened(202) and a chatting waiting mode state is processed(203). If a buyer searches a commodity to be bought and requests a chatting to the seller(204), the chatting window is popped-up or a chatting alarm signal is transmitted. The seller performs a real time transaction with the buyer through the chatting window(205). If a transaction is not completed, the chatting waiting mode is processed(206). If a transaction is completed, the seller checks stored commodities(207).
Patent KR-20000037123-A (KR)
Inventor: LEE KYUNG JOO
IPC: G06F17/00
Filed: 2000-04-07
Abstract: PURPOSE: An interactive interface driven system is provided to automatically present the optimum interface model and environment menu by analyzing a user registered information, a behavior style, and to select the optimum interface model and environment menu. CONSTITUTION: An interactive interface driven system is composed the steps of;constructing the user registered information and storing utilization record into a database;confirming the user when the user starts on the connection;providing the interface of predetermined type according to the user;storing the interface of predetermined type at database;and selecting the interface.
Patent KR-20010096395-A (KR)
Title: Concentrated photohvoltaic-thermal hybrid panel
Inventor: HUH CHANG SU
IPC: F24S23/00
Filed: 2000-04-19
Abstract: PURPOSE: A focusing type solar light and heat compound panel is provided to achieve an increased electrical and thermal efficiency of the panel by focusing solar light through reflector plates. CONSTITUTION: A compound panel comprises a plurality of solar batteries(3) arranged at regular intervals and which serve as a semiconductor used for an optical conversion; a plurality of reflector plates(2) arranged at a predetermined angle at both ends of the solar battery, and which allow solar light to be focused to the solar battery; a plurality of heat absorbing plates(4) arranged to contact the solar battery, and which absorb heat generated from the solar battery and lower temperature of the solar battery so as to maximize efficiency of the solar battery; a plurality of heat media(5) arranged to contact the lower end of the reflector plate, and which transfer solar heat absorbed by the heat absorbing plate to a heat exchanger such as a solar heat storage reservoir; a heat insulation member(6) arranged beneath the heat absorbing plate and heat media so as to prevent thermal loss; and a glass cover(1) covering the top of the reflector plate so as to prevent thermal loss.
Patent KR-20010097591-A (KR)
Inventor: CHO HANG BUM
IPC: G10H1/32
Filed: 2000-04-25
Abstract: 본 발명은  전기기타를 구성하는 바디의 전면을 전체 또는 부분적으로 합성수지재로 구성함으로서 디자인 다양화에 의한 제품의 고급화와 생산성의 극대화 및 원가의 대폭절감이 구현되게한 전기기타 및 그 제조방법을 제공함에 그 목적이 있다. 
     이s를위한  본발명 전기기타의 특징은 바디의 전면판을 전체 또는 부분적으로 합성수지재로 구성한 부분이다. 
     또한, 본 발명 전기기타의 제조방법은, 필요 형태로 성형된 투명의 원판을 절단하고 부품조립 부위를 천공하는 절단공정과; 상기 절단된 전면판의 내면에 원하는 디자인 및 색으로 구획착색하는 착색공정과; 착색된 전면판의 내측에 강도보강용 보강부재를 접착하는 접착공정과; 상기 보강부재가 접착된 전면판의 전면에 바디구성부품을 조립하는 부품조립공정과; 부품 조립된 전면판을 별도 제작된 바디의 전면에 패킹과 함께 블트조임하는 체결공정으로 구성된다.
Patent KR-20010097655-A (KR)
Inventor: NAM JAE U
IPC: H04N3/16
Filed: 2000-04-25
Abstract: 본 발명은 서지전압 제거 기능이 구비된 모니터의 수평 동기 신호 생성회로에 관한 것으로, 수평 동기 펄스 신호에 따라  트랜스 구동제어신호를 출력하는 구동소자부와, 이 구동소자부의 트랜스 구동제어신호에 따라 구동전압을 유기하는 트랜스와, 상기 구동소자부와 트랜스의 일차측 사이에 연결되어 트랜스로부터 발생된 서지전압을 제거하는 스노버단으로 이루어진다. 
     상기와 같은 구성의 본 발명은 수평 주파수 생성을 위한 트랜스 구동시 발생되는 서지전압이 구동 트랜지스터로 유입되는 것을 방지하게 되므로 이에따라 서지전압으로부터 구동소자의 파손을 보호한다.
Patent KR-20010100474-A (KR)
Inventor: SONG JONG WON
Filed: 2000-05-02
Abstract: 본 발명은 전기공급에 의해서 가열되는 가열장치에 관한 것으로, 더욱 상세하게는 초음파에 의해서 물을 분자화 시키고, 물을 내포하고 있는 용기에 와류손을 발생시켜 가열시키는 가열장치에 관한 것이다. 
     본 발명의 구성은 대략 영문자E 자형상의 코어의 중심 코어에 코일을 권선하고, 이 코일에 초음파 발생주파수 이상의 주파수를 갖는 전원을 공급하고, 이 중심코어에 발생한 자기력선이 양쪽의 측부코어로 회귀될 때, 자기력선의 변화에 의하여 물 수용부에 미세 초음파진동을 일으키는 한편, 수용부에 자기력선 변화에 의한 유도기전력에 의한 와류손에 의한 열을 발생시켜 물을 가열시킨다. 
     상기 발명에 따르면, 초음파진동 및 와류손에 의하여 물분자를 진동시킴으로써 물이 용이하게 가열될 수 있어 일반적으로 와류손만을 이용하는 인덕션 가열기보다 보다 고효율로 가열 효과를 볼 수 있는 뛰어난 효과를 얻을 수 있다.
Patent KR-20010104808-A (KR)
Title: 환상(環狀)냉각관식 얼음저장탱크
Filed: 2000-05-15
Abstract: 본 발명은 검사 보수가 편리하고 열 교환율이 높고, 사용수명이 긴 환상냉각관식 얼음저장탱크를 설계하는 것을 목적으로 한다. 중공의 탱크와 탱크의 속에 설치하는 정위태와 열교환의 효능을 가지는 복수의 정위태에 얹어서 환상냉각관 과탱크의 내측상부에 설치해서 환상냉각관과 열용해 방식으로 연결되는 냉각주관으로서 구성되는 일종의 환상관식 얼음저장탱크에 관한 것이다.
Patent KR-20010007167-A (KR)
Inventor: TAKEUCHI MASAMITSU
IPC: F01C17/06
Filed: 2000-06-01
Abstract: PURPOSE: To prevent occurrence of abrasion of a thrust ball bearing, and allow increasing of load application to the bearing. CONSTITUTION: This thrust ball bearing has a thrust plate 9a performing revolution, a thrust plate 4a faced to the thrust plate 9a, a holder 40 arranged between the thrust plates 9a and 4a and formed with a retaining hole 42 for retaining a ball 41, and the ball 41 retained inside the holding hole 42. When ρ denotes a revolving radius of the thrust plate 9a, (d)denotes a diameter of the ball, and D denotes a diameter of an aperture of the holding hole, the following formula is satisfied; D>=d+ρ.
Patent KR-20010007240-A (KR)
Title: Silicone rubber-based wiper blade for vehicle windows
Inventor: SHIZUKUDA YOSHINARI
IPC: B60S1/38
Filed: 2000-06-05
Abstract: PURPOSE: A wiper blade of rubber for automobiles is provided not to destroy a coating film even on a glass surface having a water-repellent coating film for a long time. CONSTITUTION: A wiper blade(1) characteristically has a lip portion(4) made from a silicone rubber and provided on both side surfaces each with a wiping layer(7) coming into contact with the glass(6) surface, which consists of a specified deposition density of particles of silica, graphite and the like having a specified particle size distribution and bonded to the side surface of the lip portion(4) with a silicone rubber composition as in a coating layer of a cured silicone rubber containing the particles.
Patent KR-20020004076-A (KR)
Title: Yagi antenna and clamp device capable of tilting and aiming
Inventor: HWANG IN SU
IPC: H01Q19/04
Filed: 2000-06-30
Abstract: PURPOSE: A YaGi antenna capable of tiling and aiming is provided to be easily installed and controlled in case that the orientation of the antenna is changed due to wind or external impulse or is to be changed at need, thereby reducing the risk to an installer. CONSTITUTION: A radiator for radiating electric waves, a plurality of wave guides axially arranged with predetermined gaps on one side of the radiator, and a reflector formed on the other side of the radiator are integrally manufactured into an antenna device. A connector supplies signals to the antenna device. A bracket(211) is bended into U-shape and a first rotation shaft(214) and a groove(216) on its both sides. A first clamp(212) is inserted into the bracket(211) and has a vertical rotation shaft(215). A second clamp(213) is assembled to the first clamp(212) and has engaging steps(217) on its bottom/top surfaces and fixing holes(218) on its both sides.
Patent KR-20020007727-A (KR)
Title: Sugarless hard candy and preparation process thereof
Inventor: AHN BYEONG SU
IPC: A23G3/00
Filed: 2000-07-18
Abstract: PURPOSE: Provided are sugar free hard chewing candy and its preparation process, which candy contains 0.005-0.5% of taste enhancer to improve its taste. CONSTITUTION: The sugar free hard chewing candy is manufactured by adding 0.005-0.5 wt.% of taste enhancer selected from maltol such as ethylmaltol and amino acid, such as L-phenylalanine, monosodium L-aspartic acid, L-threonine and L-histidine monohydrochloride.
Patent KR-20000063713-A (KR)
Inventor: KHIM YOUNG MIN
IPC: B09B1/00
Filed: 2000-07-31
Abstract: PURPOSE: A separation-withdrawal system for landfill gas and leachate is provided, which is characterized in that the system has a horizontal gas-collection facility at mediate soil cover layer and a header pipe and a gas-liquid separator to transfer and separate simultaneously through a pipe. CONSTITUTION: A separation-withdrawal system for landfill gas and leachate consists of the follow parts: soil cover layer(2); and a horizontal gas-collection facility(10), in detail transfer pipes; a form-making device; ballast; a side-header pipe; non-woven fabric; a pipe connected to a vertical withdrawal well; a header pipe; and a gas-liquid separator.
Patent KR-20020012776-A (KR)
Inventor: PARK IN HO
IPC: F24F3/14
Filed: 2000-08-08
Abstract: PURPOSE: A condensate water storage apparatus for dehumidifier is provided to control the storage capacity of the condensate water reservoir by improving the structure of the reservoir. CONSTITUTION: A dehumidifier comprises a cabinet(50); a housing(60) installed within the cabinet, and which has a drain portion(64) for collecting and draining the condensate water falling from a heat exchanger(70); the heat exchanger mounted onto the drain portion, and which solidifies the water contained in the sucked indoor air; and a water reservoir(100) disposed underneath the drain portion so as to collect the condensate water. The water reservoir includes a fixed portion(100a) and a movable portion(100b), and a corrugated portion(100c) formed between the fixed portion and movable portion so as to adjust the volume of the water reservoir by the amount of drainage of condensate water and the size of the installation space.
Patent KR-20020017129-A (KR)
Title: Oil ring for decreasing engine oil waste
Inventor: LEE SANG WON
IPC: F02F5/00
Filed: 2000-08-29
Abstract: PURPOSE: An oil ring for reducing the consumption of engine oil is provided to reduce the consumption of engine oil by reducing a gap formed between the upper and lower faces of a side rail and an oil ring groove. CONSTITUTION: An oil ring groove(3) is formed in a piston(1). An oil ring(4) constituted of a space expander(5) and an upper and a lower side rails(6,7) is received in the oil ring groove. Outer ends(8,9) of the side rails contact to a cylinder bore(2) to close the oil ring. The outer ends of the side rails are adhered to the cylinder bore by the space expander. The upper and lower side rails have horizontal faces(12,13) adhered to upper and lower walls(10,11) of the oil ring groove, and the inner faces of the side rails are taper faces(14,15) having a taper angle. The formation of a gap between the side rails and the oil ring groove is avoided. Therefore, oil flow is interrupted.