baber/WOPTO huggingface dataset:
Patent KR-970006187-B1 (KR)
Title: Direction change circuit of clv motor
Inventor: LEE HUN-SOO
IPC: G11B19/20
Filed: 1992-02-27
Granted: 1997-04-24
Abstract: A direction changing circuit of a CLV motor in an optical reproducing apparatus using a square disc which drives a motion direction of a CLV driver(5) by applying a flux control signal of a PLL circuit(1) is disclosed. In the direction changing circuit, a first operational amplifier(OP1) inverts a flux control signal of a PLL circuit(1) higher than a driving voltage. A second operational amplifier(OP2) noninverts the flux control signal of a PLL circuit(1) lower than the driving voltage. A multiplexor(7) switches outputs of the first operational amplifier(OP1) and the second operational amplifier(OP2) and applies the switched outputs to a CLV driver(5). The multiplexor(7) is switched by a switching signal of a microcomputer(4). The microcomputer(4) detects odd and even dots of a square disc.
Patent KR-100193973-B1 (KR)
IPC: C07C69/84
Filed: 1992-03-05
Granted: 1999-06-15
Abstract: This invention provides a process and intermediates for preparing 2,2-dimethyl-2,3-dihydrobenzofuran-7-carboxylic acids.
Patent KR-950000153-B1 (KR)
Title: Manufacturing method of semiconductor device
Inventor: LEE NAE-IN
IPC: H01L29/772
Filed: 1992-03-20
Granted: 1995-01-10
Abstract: The invention relates to formation of a polycide gate electrode and a self alignment contact hole. The method comprises (A) forming a gate oxide layer, a polysilicone layer and a nitride layer on the substrate in turn; (B) oxidizing the gate oxide layer and polysilicon layer, after patterning the gate electrode; (C) forming a spacer at the side wall of the gate electrode pattern; (D) thermal-oxidizing silicon located on the active region, after forming source/drain region to ion-implant impurity in the active region; (E) removing the nitride layer positioned on the gate electrode pattern; (F) first annealing for forming Ti-disilicide layer; and (G) second annealing.
Patent KR-960001834-B1 (KR)
Inventor: WILLIAM KIRK
IPC: A23N7/10
Filed: 1992-04-23
Granted: 1996-02-06
Abstract: 내용 없음.
Patent KR-940005471-B1 (KR)
Title: Apparatus for controlling microwave oven
Inventor: KIM JI-WON
IPC: H05B6/68
Filed: 1992-05-22
Granted: 1994-06-18
Abstract: The automatic thaw cooking apparatus and method includes a microprocessor for controlling the whole operation of a microwave oven, a relay driver for driving a magnetron driving relay by the control of the microprocessor, a magnetron driver for generating an electromagnetic wave by driving a magnetron, and a ultrasonic wave driver for generating a ultrasonic wave by driving a ultrasonic vibrator, thereby improving the reliability of a product.
Patent KR-950000527-B1 (KR)
Title: Apparatus for and method of controlling sound volume of telephone ring
Inventor: KANG HYONG-MIN
IPC: H04M1/00
Filed: 1992-06-29
Granted: 1995-01-24
Abstract: displaying a time value set by number keys on the key pad to store in case of selecting phone bell off, counting operating time of timer to compare the set time value with the timer value, preventing phone bell from sounding by blocking a ring signal if the timer value is less than the set value, cancelling phone bell off function by normal input of the ring signal if the timer value is equal to the set value.
Patent KR-100273734-B1 (KR)
IPC: A61P7/10
Filed: 1992-09-26
Granted: 2001-02-01
Abstract: The present invention relates to compounds of the formula <CHEM>  wherein   B<5> and B<6>   are each independently hydrogen; hydroxy; -OR<6> wherein R<6> is a C<5>-C<8> alkyl or an Ar-Y group wherein Ar is aryl and Y is a hydrogen or C<5>-C<8> alkyl; or, where B<5> and B<6> are attached to adjacent carbon atoms, B<5> and B<6> can be taken together with said adjacent carbons to form a benzene ring or methylenedioxy; A   is a bond, methylene or oxygen, sulfur or NR<8> or NCOR psi wherein R<8> is hydrogen, a C<5>-C<8> alkyl or an Ar-Y- group and R psi  is -CF<7>, a C<5>-C<5><4> alkyl or an Ar-Y- group; R<7>   is hydrogen or -CH<6>OC(O)C(CH<7>)<7>; R<5>   is hydrogen, C<5>-C<8> alkyl or -CH<6>OC(O)-C(CH<7>)<7>; and n   is an integer 1 to 3, which are useful as inhibitors of enkephalinase and ACE.
Patent KR-0136264-B1 (KR)
Inventor: YOSHITA MITSURU
IPC: B01J29/16
Filed: 1992-10-09
Granted: 1998-04-24
Abstract: 중질탄화수소유를 촉매의 존재하에 수소화 처리하는데 있어서, 상기 중질탄화수소유를 수소화 탈금속 처리하고, 이어서 수소화 분해처리 한 후, 수소화 탈황 및 수소와 탈질소 처리하는 것을 특징으로 하는 중질탄화수소유의 수소화 처리 방법과, 상기 수소와 처리, 유동성 접촉 분해처리, 가열 수소화 분해처리등의 처리공정으로 된 중질탄화수소유의 처리방법이 개시되어 있으며, 이 방법에 따라 중질탄화수소유로 뷰터 나프타 유분 및 등,경유 유분을 높은 수율로 효율좋게 얻을 수 있어서 매우 경제적이다.
Patent KR-960010143-B1 (KR)
Title: Strip stacker
Inventor: PARK CHAN-HONG
IPC: H01L21/68
Filed: 1992-11-10
Granted: 1996-07-26
Abstract: a frame (1) made by cutting a thin plate into long, narrow pieces; a strip transporting part (2) installed at one side of the frame (1)'s upper part; a stopper (29) for reducing shock; guide rails (23) to support a strip (S); first and second feeding rollers (25; 26) rotated by a motor (24); an idle roller (27) elevated by a roller cylinder (28); a lifter plate (4) elevated by a lifter cylinder (3); a conveyor (6) located under the lifter plate (4) and operated by a motor (5); and a shutter plate (20) reciprocating with a shutter cylinder (21).
Patent KR-0159957-B1 (KR)
Title: Method for connecting two parts along abutting edges and connection obtained thereby
Inventor: OETIKER HANS
IPC: F16B9/02
Filed: 1992-11-18
Granted: 1999-03-30
Abstract: In a connection of two edges of areal parts which extend at least along one common section essentially parallel to one another, at least one retaining element (9,29,39,109) is arranged at the one edge which form-lockingly engages from behind, as viewed in the edge direction, in a recess (13,23,43,113) in the other edge. At least one projection (17,19,47,49,117,119) arranged laterally offset at the one edge in relation to the retaining element in the direction of the engagement from behind, abuts form-lockingly at the part with the recess essentially in the edge direction. To reliably secure together the parts, laser beam welding is used along the common sections of at least one of the retaining element and of the projection. <IMAGE>
Patent KR-950009029-B1 (KR)
Title: Method and apparatus for supplying a uniform strip of bread dough
Inventor: MORIKAWA MICHIO
IPC: A21C9/08
Filed: 1992-11-27
Granted: 1995-08-14
Abstract: A method and apparatus for supplying a uniform strip of bread dough is provided in which a dough mass (1) flows downward from a dough hopper (3), a dough portion of the flowing dough mass is laterally spread on an outlet conveyor (20) having a weighing table (19), dough portions are cut and divided from the dough mass (1) into dough pieces when a predetermined degree of the spread of the dough mass (1) is detected by a dough-detecting device (18), simultaneously the weight of the dough piece is measured, the dough piece is then transferred from the outlet conveyor to a supply conveyor (21), the divided dough pieces are arranged on the supply conveyor at intervals proportionate to the weights of the dough pieces, and they are stretched to make a strip of bread dough. It has a uniform width and thickness, and is uniform in weight throughout the entire part of the strip of bread dough. Therefore, dough products cut and formed from this strip of bread dough are of a high quality. <IMAGE>
Patent KR-0138134-B1 (KR)
Inventor: MA BYUNG-INN
IPC: G11B7/14
Filed: 1992-12-31
Granted: 1998-05-15
Abstract: 이 발명은 종래의 CD와 동일한 데이타 변조방법을 사용하고, 디스크의 물리적인 형태인 피트 사이즈 폭, 트랙간격, 디스크 외형등은 모두 같게 하면서 트랙의 수를 N개로 하는 콤팩트 디스크의 재생장치에 관한 것으로서, 더욱 상세하게는 N개의 레이져 빔으로 N개의 트랙을 동시에 읽고, 읽은 데이타를 각각 별개의 디코더를 통해 재생한 후 이를 조합하도록 하는 것으로서, N개의 레이져 빔을 이용하여 N개의 트랙을 동시에 읽으면 데이타 전송율은 N배만큼 높게 되고, 데이타 전송율이 높은 만큼 데이타 재생이 빠르게 되어 멀티 미디어의 연속된 이미지 처리에 유리하게 된다.
Patent KR-0185747-B1 (KR)
IPC: A61K38/095
Filed: 1990-12-17
Granted: 1999-05-01
Abstract: Disclosed herein is a method for treating autoimmune diseases in mammals by administration of one or more agents selected from the group consisting of autoantigens specific for the autoimmune disease, disease-suppressive fragments and analogs of said autoantigen in aerosol form.
Patent KR-100294284-B1 (KR)
Title: 제어스테이션과트랜스폰더간의전송경화방법및이를실행하는장치
IPC: H04B1/713
Filed: 1993-02-27
Granted: 2001-09-17
Abstract: 주 스테이션(1)과 종속 스테이션(2)간에 양방향에서 전송을 경화하기 위하여, 통신 파라미터 값들에 대한 테이블이 각 스테이션에 기억되며, 이후 상기 테이블 값들은 주 스테이션의 결정에 따라 이용된다. 한 스테이션에서 다른 스테이션으로의 각 메시지는 수신 스테이션이 전파방해의 위험이 높은 값들을 제거하도록 테이블에서 선택되는 파라미터 값들을 결정할 수 있게 하는 정보를 포함한다.
Patent KR-950003279-B1 (KR)
Title: Current sink of diff amplifier
Inventor: HO YONG-NAM
IPC: H03F3/45
Filed: 1993-03-15
Granted: 1995-04-07
Abstract: The current sink comprises a first NMOS transistor consisting of a gate and drain connected to the source of a source couple pair and a source connected to the ground; and a second NMOS transistor consisting of a drain connected to the source of the source couple pair, a gate connected to a driving voltage stage for driving the current sink circuit and a source connected to the ground. The current sink controls voltage gain and wide operation band.
Patent KR-950012602-B1 (KR)
Inventor: TAKANO KAZUHIKO
IPC: A23L7/109
Filed: 1993-04-29
Granted: 1995-10-19
Abstract: 내용 없음.
Patent KR-100286121-B1 (KR)
Title: 3-(acyloxyphenyl)benzofuran-2-one stabilizer and composition comprising the same
Inventor: NESVADBA PETER
IPC: C07D307/83
Filed: 1993-05-18
Granted: 2001-04-16
Abstract: PURPOSE: Provided is a stabilizer composition comprising 3-(acyloxyphenyl)benzofuran-2-one, which has ability of effectively stabilizing organic materials against light-induced, oxidative or thermal degradation. CONSTITUTION: The stabilizer composition comprises (a) an organic material subject to oxidative, thermal or light-induced degradation; and (b) at least one compound of 3-(acyloxyphenyl)benzofuran-2-one. The compound 3-(acyloxyphenyl)benzofuran-2-one is represented by the formula 1, wherein R2, R3, R4 and R5 are hydrogen, unsubstituted or substituted alkyl, phenylalkyl, phenyl, cycloalkyl, alkoxy, hydroxy, alkanoyloxy, alkenoyloxy, cycloalkylcarbonyloxy, or benzoyloxy, or together with the carbon atoms, form a phenyl ring; R4 is additionally -(CH2)n-COR11 (in which, n is 0, 1 or 2 and R11 is hydroxy or substituted aliphatic radical); m is 1 or 2; R1 is hydrogen, unsubstituted or substituted alkanoyl, alkenoyl, cycloalkylcarbonyl or benzoyl in the case where m is 1, or R1 is -CO-R17-CO- (in which, R17 is direct bond or an aliphatic or aromatic bridge) in the case where m is 2; R7, R8, R9 and R10 are hydrogen, alkyl or alkoxy; in the case where at least one of R7, R8, R9 and R10 is hydrogen and R3, R5, R6, R7 and R10 are hydrogen, R4 is additionally a radical of the formula 2 (in which, R1, R2, R8 and R9 are as defined above, and R12 and R13 are hydrogen, alkyl or phenyl); and R6 is hydrogen or a radical of the formula 3 (in which, all the radical are as defined above).
Patent KR-0125458-B1 (KR)
Title: Printer
Inventor: SUNG MOO-KYUNG
IPC: B41J2/44
Filed: 1993-05-24
Granted: 1997-12-24
Abstract: The invention is a device for controlling selective pixel size in a electrophotography development printer. Pulse width controlling part(38) expands video data pulse widths generated from video data generating part(34) differently for one another with different setting times, Option part(40) and multiplexer(42) confirm one of many video data whose pulse width is adjusted to engine(36) selectively and engine(36)prints images pursuant to pixel size of pulse width by exposure for a certain time equivalent to video data pulse width from multiplexer(42).
Patent KR-970001096-B1 (KR)
Title: Processing method of mixing juice of an edible snail
Inventor: JOO DONG-KWAN
IPC: A23L17/40
Filed: 1993-07-09
Granted: 1997-01-28
Abstract: The preparation of mixed juice of edible snail reducing consumption of heat energy and having a reduction effect of product cost is provided by highly increasing the content of naked snail component contained in mixed juice of edible snail. Edible snail that a naked snail part is contained in shell washes out. 55 wt% of the washed edible snail and 45 wt% of medicine(9.5 wt% of licorice, 9.5 wt% of Garnoderma lucidum, 8 wt% of mume fruit, 8.5 wt% of schizandra, 9.5 wt% of Chinese dioscorea) are added and mixed, then 5 times of purified water is added. The mixture is heated at the temperature of 120 deg.C and circulated under the pressure of 2kg/cm using a circulating pump for 4 hours. The resultant mixed juice of edible snail is extracted by a filter in vacuo, then the extractant is evaporated to remove a part of moisture during cooling to ambient temperature to obtain the mixed juice of edible snail having a desired viscosity.
Patent KR-960006609-B1 (KR)
Title: Self preheating soft starter circuit for electronic ballast
Inventor: JANG KI-WON
IPC: H05B41/26
Filed: 1993-07-16
Granted: 1996-05-20
Abstract: The apparatus comprises first and second diodes connected to a connection point of an inductor and a lamp, while one terminal of the first diode is connected to anode of a SCR1 and a resistor; the SCR1 whose gate is connected to the other terminal of the resister, a transistor whose base to a bias voltage, and whose emitter and collector to the gate and cathode of the SCR1, respectively; and a self preheating soft starter circuit consisting of a Zenor diode, a capacitor, and the second resister.
Patent KR-0162204-B1 (KR)
Inventor: MOON HUN-HEE
IPC: H04N19/124
Filed: 1993-07-27
Granted: 1998-12-15
Abstract: 본 발명은 영상신호의 동보상 부호화장치에서, 매크로블럭단위로 데이타 특성을 검출하여 그 특성에 적절한 양자화레벨을 제공하여 최적의 양자화를 구현하기 위한 영상데이타 분석장치에 관한 것으로, 부호화하고자 하는 매크로블럭의 DC평균값, 저주파영역의 평균값, 에지영역의 평균값, 고주파영역의 평균값을 산출하고, 이 산출된 데이타값에 따라 매크로블럭의 상태를 결정하며, 그 상태에서 가장 적절한 양자화레벨을 매크로블럭단위로 공급한다. 그러므로써, 영상데이타의 부호화가 보다 효과적으로 수행되며 화질도 개선된다.
Patent KR-100289729-B1 (KR)
Title: Optical package and method for fixing optical fiber within the same
Inventor: LEE SANG HO
IPC: G02B6/00
Filed: 1993-10-26
Granted: 2001-05-15
Abstract: PURPOSE: An optical package and a method for fixing an optical fiber within the same are provided to improve reliability of an optical package by preventing deformation due to heat and an impact. CONSTITUTION: The first and the second optical fiber support plates(17) are installed parallel in a predetermined interval on a laser diode chip sub-mount(13). The first optical fiber fixing point(15) is formed on the first optical fiber support plate(17). A round groove is formed on the second optical fiber support plate(17). A metal layer of a round shape is formed on the round groove. The second optical fiber fixing point(16) is inserted into the metal layer in order to fix the optical fiber(14). An optical fiber fixing material is formed on the optical fiber(14) of the first and the second optical fiber fixing points(15,16). The third optical fiber fixing point(18) is formed on a wall face.
Patent KR-100279344-B1 (KR)
Title: 기재의 미세공을 충전하기 위한 박막형성장치
IPC: C23C14/04
Filed: 1993-10-28
Granted: 2001-01-15
Abstract: 본 발명 박막형성장치는 타킷트와 기재사이의 거리가 기재의 직경보다 크게되어 있고 진공챔버내의 내부기체 압력이 스퍼터링 과정중에 1×10 -1 Pa 이하로 유지되므로서 분진발생과 공극형성 없이 기재에 형성된 미세공을 효과적으로 충전할 수 있다.
Patent KR-960006677-B1 (KR)
Title: Vtr system with looking function of in-put and controlling method
Inventor: JUNG SANG-CHOL
IPC: G11B15/02
Filed: 1993-10-29
Granted: 1996-05-22
Abstract: The system comprises an input signal selector switch; an image signal processing unit; an output signal selector switch; a VTR microcomputer; various kinds of remote controllers; a reception unit; and a transfer unit having an input signal confirmation switch for selecting any one of a plurality of input signals under the control of a microcomputer, a VTR counter for counting a key input delay time set up in the microcomputer, a RF modulating unit for RF modulating the signal selected by the input signal confirmation switch, and a transfer unit for transferring an output of the RF modulating unit to a remote controller. The remote controller includes an input signal confirmation key for the switch of the input signal confirmation mode, a RF reception unit for receiving the signal transferred from the transfer unit, a driving unit for converting the output of a RF demodulating unit into a signal for CCD operation, a remote counter for counting a timing to confirm the key input time, and a remote micro computer for controlling each of the above units according to the input of the input signal confirmation key.
Patent KR-960014252-B1 (KR)
Title: Dehydration tub breaking method
Inventor: JUNG MAN-KOO
IPC: D06F37/42
Filed: 1993-10-30
Granted: 1996-10-14
Abstract: The method is disclosed to reduce noise from forced stop of a rotating motor and to decrease damage of gears and the clutch by sensing rotating speed of motor. The mothod includes the steps of : judging whether the spinning course is finished or not; disconnecting the power suppled to the motor if spinning is finished; reading signal from a hole sensor which detects magnetic field from the magnet mounted on a motor pulley; comparing the pulse count generated from the hole sensor with a reference pulse count; and an operating brake for stopping the rotation of the drum when the counts of the hole sensor pulse is smaller than a reference counts.
Patent KR-0124150-B1 (KR)
Title: Slip frequency presumptive method of inducing motor
Inventor: KIM JUNG-KYUN
IPC: H02P7/00
Filed: 1993-11-26
Granted: 1997-12-01
Abstract: The present invention relates to a slip frequency estimating method for an induction motor. According to this inventive method, a stator flux is computed from a stator voltage, and the slip frequency is estimated from the stator flux and the stator current command so this is a truthful estimation with respect to all the parameters of the induction motor and assures the exact slip frequency estimation to all the parameters of motors different from each other according to manufacturing companies. In addition, the exact slip frequency estimation is possible without regard to the variation.
Patent KR-960005829-B1 (KR)
Title: Method for manufacturing a hot-dipped zinc steel plate with zero spangles of an excellent corrosion resistance
Inventor: KIM JONG-SANG
IPC: C23C2/00
Filed: 1993-12-29
Granted: 1996-05-01
Abstract: The zero-spangle steel sheet is produced by the processes of (1) galvanizing a rtecl sheet, and (2) zero-spangle galvanizing the sheet by spray treatment of zero spangling agent on the surface of the sheet as a starting material just before the solidification of molten zinc on th surface of the galvanizing sheet. Zero spangling agent as a spray solution is a phosphate aqueous solution. The optimum conditions of phosphate solution are the following: (a) an addition agent is a metal or metal salt powder of one species selected from Ti, Ni and Ti(OH)2; (b) the particle size of a metal or metal salt powder is 50 to 100 Pm; (c) the concentration of a metal as mentioned above is 10 to 50g/L; (d) the concentration of phosphate ion is 1 to 5wt.%; and (e) pH is adjusted 4 to 6 by buffer solution. The produced sheet is used for automobiles and home appliance requiring good corrosion resistance.
Patent KR-100196814-B1 (KR)
Title: A post for marking road verges
Inventor: PEDER FAST
IPC: E01F9/619
Filed: 1991-10-25
Granted: 1999-06-15
Abstract: PCT No. PCT/SE91/00720 Sec. 371 Date Apr. 7, 1993 Sec. 102(e) Date Apr. 7, 1993 PCT Filed Oct. 25, 1991 PCT Pub. No. WO92/08219 PCT Pub. Date May 14, 1992.A verge post having a plurality of flat vertical side faces and side edges for marking road verges or the boundaries of traffic lanes. The post is constructed with material which will fluoresce when illuminated with ultraviolet light, and to transmit visible light from the side faces and edges in two or more directions when illuminated with ultraviolet light from one direction. Different parts of the post can be made so they will fluoresce with different colors when illuminated with ultraviolet light.
Patent KR-960008685-B1 (KR)
Inventor: KANEMITSU TOSHIAKI
IPC: B21D53/18
Filed: 1993-08-25
Granted: 1996-06-29
Abstract: 내용없음.
Patent RO-122065-B1 (RO)
Title: Apparatus for optical disk and optical disk
Inventor: YUKIO SHISHIDO
IPC: G11B27/30
Filed: 2000-12-11
Abstract: The invention relates to an apparatus for optical disk and an optical disk which has a different synchronization configuration for the signal obtained by reading the position information fixed in the guide grooves irradiated with a light spot. According to the invention, the apparatus comprises an identifying device (34), for identifying a type and/or the way of registering an optical disk (10), by recognizing a synchronization configuration of a signal obtained in the device of reading the position information (30). According to the invention, the optical disk is characterized in that the way of registering and/or formatting the optical disk may be recognized by detecting the synchronization configuration of the position information.
Patent RO-118051-B1 (RO)
Title: Gas-liquid mixture separator
Inventor: CĂLIN I GHEORGHE
IPC: B01D11/04
Filed: 2001-03-29
Abstract: The invention relates to a gas-liquid mixture separator used in chemical industry. According to the invention, the gas-liquid mixture separator ensures the phase separation from a mixture by mounting inside a cylindrical body (1) a heat exchanger (2) which is crossed by a central conduit (11) wherethrough the liquid drains from the upper separation chamber (5) in order to cool the gas-liquid mixture which rises towards the middle separation chamber (4).
Patent RO-120210-B1 (RO)
Title: Double lock for doors
Inventor: MARTISCA P MIHAI
IPC: E05B29/06
Filed: 2002-03-07
Abstract: The invention relates to a double lock for doors to ensure a better protection against unauthorized opening. According to the invention, the lock comprises a base plate (8) on which there are orthogonally mounted two safety cylinders, each cylinder having a barrel (1 and 3), inside of which there is mounted, rotatable by the suitable key, a primary core (1' and 3') to which a secondary core (2' and 4') of a tumbler (2 and 4) is fixed by means of a coupling (5), the barrel (1) of the first safety cylinder being rigidly connected with the barrel (3) of the second safety cylinder by means of a rib (13), each of the two tumblers (2 and 4) being provided at its rear part with a toothed wheel (6 and 7)said two wheels being permanently engaged to each other.
Patent RO-121053-B1 (RO)
Title: Meter
Inventor: OTL ECAN DIMITRIE D ENU
IPC: G01F1/56
Filed: 2002-03-21
Abstract: The invention relates to a mechanical-electrical meter with turbine and axial admission, meant to determine the fluid quantity which passes through a pipe. The counter consists of two cyndrical tubes (1 and 2), coaxially arranged, one in continuation of the other and inter-connected to each other through a thread. The first cylindrical tube (1) is provided with an interior circular recess (a) situated close to the connection area of the two cylindrical tubes (1 and 2), wherein there is rotatably located a turbine (5), whose periphery there is mounted at least a permanent magnet (3) which induces electrical impulses into a transducer (11), for instance, of the type of the Hall probe. The turbine (5) is integral with a longitudinal shaft (6) which, at the ends, is supported by some bearings (7 and 8) fastened on some elastic supports (9 and 10) mounted in some circular recesses (b and c), made on the inner surfaces of the two cylindrical tubes (1 and 2).