DE4412132C2 - Abdichtung für eine Gelenkkreuzbüchse - Google Patents
Abdichtung für eine GelenkkreuzbüchseInfo
- Publication number
- DE4412132C2 DE4412132C2 DE4412132A DE4412132A DE4412132C2 DE 4412132 C2 DE4412132 C2 DE 4412132C2 DE 4412132 A DE4412132 A DE 4412132A DE 4412132 A DE4412132 A DE 4412132A DE 4412132 C2 DE4412132 C2 DE 4412132C2
- Authority
- DE
- Germany
- Prior art keywords
- sealing
- seal
- section
- bearing
- shoulder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007789 sealing Methods 0.000 title claims description 44
- 230000002787 reinforcement Effects 0.000 claims description 33
- 238000005096 rolling process Methods 0.000 claims description 13
- 239000013013 elastic material Substances 0.000 claims description 2
- 239000000428 dust Substances 0.000 description 2
- 230000001976 improved effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
- F16C33/7809—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for needle roller bearings
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C21/00—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement
- F16C21/005—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement the external zone of a bearing with rolling members, e.g. needles, being cup-shaped, with or without a separate thrust-bearing disc or ring, e.g. for universal joints
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race rings
- F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings
- F16C33/605—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings with a separate retaining member, e.g. flange, shoulder, guide ring, secured to a race ring, adjacent to the race surface, so as to abut the end of the rolling elements, e.g. rollers, or the cage
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/72—Sealings
- F16C33/76—Sealings of ball or roller bearings
- F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
- F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
- F16C33/7873—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section
- F16C33/7876—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a single sealing ring of generally L-shaped cross-section with sealing lips
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
- F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
- F16D3/382—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another constructional details of other than the intermediate member
- F16D3/385—Bearing cup; Bearing construction; Bearing seal; Mounting of bearing on the intermediate member
-
- 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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D3/00—Yielding couplings, i.e. with means permitting movement between the connected parts during the drive
- F16D3/16—Universal joints in which flexibility is produced by means of pivots or sliding or rolling connecting parts
- F16D3/26—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected
- F16D3/38—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another
- F16D3/40—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another with intermediate member provided with two pairs of outwardly-directed trunnions on intersecting axes
- F16D3/41—Hooke's joints or other joints with an equivalent intermediate member to which each coupling part is pivotally or slidably connected with a single intermediate member with trunnions or bearings arranged on two axes perpendicular to one another with intermediate member provided with two pairs of outwardly-directed trunnions on intersecting axes with ball or roller bearings
-
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
- F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
- F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
-
- 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
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2361/00—Apparatus or articles in engineering in general
- F16C2361/41—Couplings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sealing Of Bearings (AREA)
Description
2 Lagerbüchse
3 Lagerzapfen
4 Wälzkörper
5 Endabschnitt
6 Armierung
7 Mittelteil (zylindrisch)
8 Innenwandung
9 Verbindungszone
10 Abschnitt (radial)
11 Abkantung
12 Schulter (Lagerbüchse)
13 Ausnehmung
14 Schulter (Lagerzapfen)
15 Dichtspalt
16 Dichtkörper
17 Ausnehmung
18 Dichtlippe
19 Dichtlippe
20 Oberfläche
41 Dichtung
46 Armierung
47 Mittelteil
51 Abkantung
52 Schulter (Lagerbüchse)
54 Schulter (Lagerzapfen)
55 Dichtspalt
56 Abschnitt (bogenförmig)
Claims (8)
- - über ein zylindrisches Mittelteil (47) kraftschlüssig an einer Innenwandung der Lagerbüchse (2) anliegt;
- - einen radial nach innen gerichteten Abschnitt (10) aufweist, der einen Axial anschlag für die Wälzkörper (4) bildet;
- - eine radial nach außen ausgerichtete Abkantung (51) aufweist, die an einer Stirnseite, einer Schulter (52) der Lagerbüchse (2) abgestützt ist;
- - mit einem Abschnitt (56) versehen ist, der von der Abkantung (51) beginnend unter Einhaltung eines radial verlaufenden Dichtspaltes (55) bis an eine Schulter (54) des Lagerzapfens (3) geführt ist (Fig. 2).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4412132A DE4412132C5 (de) | 1994-04-08 | 1994-04-08 | Abdichtung für eine Gelenkkreuzbüchse |
US08/645,128 US5597356A (en) | 1994-04-08 | 1996-05-13 | Sealing arrangement for a cardan spider bush |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4412132A DE4412132C5 (de) | 1994-04-08 | 1994-04-08 | Abdichtung für eine Gelenkkreuzbüchse |
Publications (3)
Publication Number | Publication Date |
---|---|
DE4412132A1 DE4412132A1 (de) | 1995-10-12 |
DE4412132C2 true DE4412132C2 (de) | 1997-03-13 |
DE4412132C5 DE4412132C5 (de) | 2005-07-28 |
Family
ID=6514919
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4412132A Expired - Lifetime DE4412132C5 (de) | 1994-04-08 | 1994-04-08 | Abdichtung für eine Gelenkkreuzbüchse |
Country Status (2)
Country | Link |
---|---|
US (1) | US5597356A (de) |
DE (1) | DE4412132C5 (de) |
Families Citing this family (35)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3302891B2 (ja) * | 1996-10-31 | 2002-07-15 | 三菱電機株式会社 | 可とう歯車継手 |
US6045137A (en) * | 1998-02-16 | 2000-04-04 | Caterpillar Inc. | Radial seal having a metal support |
US6050899A (en) * | 1998-05-15 | 2000-04-18 | Neapco, Inc. | Sealing system for a universal joint assembly |
US6601855B1 (en) | 1998-10-12 | 2003-08-05 | Freudenberg Nok Gp | Seal for a universal joint |
US6609716B2 (en) * | 2001-12-26 | 2003-08-26 | Caterpillar Inc | Wiper seal |
DE10234305A1 (de) * | 2002-07-26 | 2004-02-19 | Spicer Gelenkwellenbau Gmbh & Co. Kg | Dichtring zur Abdichtung eines Längenausgleichs einer Gelenkwelle |
CN100417848C (zh) * | 2002-09-09 | 2008-09-10 | Nok株式会社 | 密封装置 |
DE10252433A1 (de) * | 2002-11-12 | 2004-05-27 | Ina-Schaeffler Kg | Abdichtung für eine Lagerbüchse |
US20040171427A1 (en) * | 2003-02-28 | 2004-09-02 | Wagner John Brian | U-joint face seal |
US6827649B2 (en) * | 2003-03-12 | 2004-12-07 | American Axle & Manufacturing, Inc. | Universal joint with friction fit and bearing cup retainer |
US6837795B2 (en) * | 2003-04-14 | 2005-01-04 | American Axle & Manufacturing, Inc. | Universal joint with bearing cup retention seal assembly |
US6893350B2 (en) * | 2003-05-08 | 2005-05-17 | American Axle & Manufacturing, Inc. | Universal joint with torsionally-compliant spider assembly |
US7201663B2 (en) * | 2003-05-08 | 2007-04-10 | American Axle & Manufacturing, Inc. | Universal joint with integral seal deflector and retainer assembly |
DE10335872A1 (de) * | 2003-08-06 | 2005-03-10 | Voith Turbo Kg | Dichtungsanordnung und Kreuzgelenkanordnung |
JP2007064309A (ja) * | 2005-08-30 | 2007-03-15 | Ntn Corp | シェル形ころ軸受 |
EP1939485B1 (de) * | 2006-12-29 | 2010-11-10 | Aktiebolaget SKF | Dichtungs- und Führungseinheit für die Kolbenstange eines Einrohr-Stossdämpfers |
DE102007022316B4 (de) * | 2007-05-12 | 2018-04-19 | Schaeffler Technologies AG & Co. KG | Radial-Nadellager-Baueinheit |
US7887422B2 (en) * | 2007-08-02 | 2011-02-15 | American Axle & Manufacturing, Inc. | Universal joint with bearing cup retention mechanism |
US7926819B2 (en) * | 2008-08-25 | 2011-04-19 | GM Global Technology Operations LLC | Seals for transmission drive motors |
EP2366913B1 (de) | 2010-03-05 | 2016-06-01 | Tirsan Kardan Sanayi Ve Ticaret Anonim Sirketi | Schützende Ausführungsform des Dichtungsfilzes in Antriebswellengleitsätzen |
CN104379952B (zh) * | 2012-03-20 | 2018-03-23 | 舍弗勒技术股份两合公司 | 具有紧凑的静态外径密封件的密封轴承 |
CN103742545A (zh) * | 2013-12-27 | 2014-04-23 | 瓦房店轴承集团有限责任公司 | 双倒刺型外卡扣式密封挡圈 |
CN103742544A (zh) * | 2013-12-27 | 2014-04-23 | 瓦房店轴承集团有限责任公司 | 带有双倒刺型外卡扣式密封挡圈的控压厚壁轴承 |
EP2921734B1 (de) * | 2014-03-17 | 2018-05-09 | Spicer Gelenkwellenbau GmbH | Dichtung und Zapfenkreuz für Kreuzgelenke |
CN104061327A (zh) * | 2014-05-28 | 2014-09-24 | 史建伟 | 一种油封及包括该油封的轴承 |
DE102014219859A1 (de) | 2014-09-30 | 2016-03-31 | Aktiebolaget Skf | Kreuzgelenk |
DE102014224751A1 (de) * | 2014-12-03 | 2016-05-25 | Schaeffler Technologies AG & Co. KG | Zapfenlager für Kreuzgelenke und Verfahren zum Herstellen eines Zapfenlagers |
CN105782248A (zh) * | 2015-12-23 | 2016-07-20 | 江苏南方轴承股份有限公司 | 油封及包括该油封的轴承 |
US9695881B1 (en) * | 2016-06-28 | 2017-07-04 | Freudenberg-Nok General Partnership | U-joint seal |
DE102017205270A1 (de) * | 2017-02-09 | 2018-09-20 | Aktiebolaget Skf | Kreuzgelenklager |
FR3073913A1 (fr) * | 2017-11-22 | 2019-05-24 | Valeo Embrayages | Dispositif de transmission pour vehicule hybride |
KR102075472B1 (ko) * | 2017-12-14 | 2020-02-10 | 셰플러코리아(유) | 구름 베어링용 카트리지 씰 |
US20210040991A1 (en) | 2019-08-09 | 2021-02-11 | Amsted Rail Company, Inc. | Roller Bearing Seal Case |
KR20210120438A (ko) * | 2020-03-26 | 2021-10-07 | 현대모비스 주식회사 | 차량용 패킹장치 |
CN115126792A (zh) * | 2022-08-31 | 2022-09-30 | 万向钱潮股份公司 | 一种万向节密封装置 |
Family Cites Families (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2896432A (en) * | 1955-03-11 | 1959-07-28 | Borg Warner | Bearing seals for universal joints |
US2873153A (en) * | 1956-06-29 | 1959-02-10 | Federal Mogul Bower Bearings | Bearing shaft seal |
GB968837A (en) * | 1960-03-04 | 1964-09-02 | Birfield Eng Ltd | Improvements in or relating to universal joints |
DE1264170B (de) * | 1963-04-05 | 1968-03-21 | Goetzewerke | Abdichtung fuer Rollenlager in Kraftfahrzeugradnaben |
US3423140A (en) * | 1966-05-03 | 1969-01-21 | Torrington Co | Bearing seals for drawn cup bearings |
US3479840A (en) * | 1968-04-16 | 1969-11-25 | Dana Corp | Trunnion seal for cardan-type universal joint |
SU444902A1 (ru) * | 1971-03-11 | 1974-09-30 | Центральный Научно-Исследовательский Институт Технологии Машиностроения | Герметизирующа манжета |
FR2226034A5 (de) * | 1972-12-22 | 1974-11-08 | Pitner Alfred | |
SU596755A1 (ru) * | 1975-11-10 | 1978-03-05 | Всесоюзный Научно-Исследовательский И Проектно-Конструкторский Институт Редукторостроения | Манжетное уплотнение зубчатой муфты |
DE2908713C2 (de) * | 1979-03-06 | 1985-04-18 | Skf Kugellagerfabriken Gmbh, 8720 Schweinfurt | Abdichtung für Lagerbüchsen |
DE3118430C2 (de) * | 1981-05-09 | 1984-05-10 | Gelenkwellenbau Gmbh, 4300 Essen | "Abdichtung für Lagerung des Kreuzes eines Kreuzgelenkes" |
US4810233A (en) * | 1984-03-27 | 1989-03-07 | Borg-Warner Corporation | Interlocking universal joint seal assembly |
DE8422559U1 (de) * | 1984-07-28 | 1984-12-06 | Birfield Trasmissioni, Brunico | Abdichtung fuer die lagerung des kreuzes eines kreuzgelenkes |
DE3428389A1 (de) * | 1984-08-01 | 1986-02-13 | FAG Kugelfischer Georg Schäfer KGaA, 8720 Schweinfurt | Schutzkappe fuer die dichtung eines kreuzgelenks |
DE8437288U1 (de) * | 1984-12-20 | 1985-03-21 | Skf Kugellagerfabriken Gmbh, 8720 Schweinfurt | Dichtungsanordnung f}r Lagerb}chsen, insbesondere f}r Kreuzgelenke |
JPH067220Y2 (ja) * | 1986-08-13 | 1994-02-23 | 株式会社共立 | オイルシール |
DE3639315C1 (de) * | 1986-11-17 | 1988-04-14 | Gelenkwellenbau Gmbh | Vorrichtung zum Abdichten eines Waelzlagers,insbesondere von Lagerbuechsen eines Kreuzgelenkes |
US4756382A (en) * | 1987-03-02 | 1988-07-12 | Hudson Iii Joseph L | Loudspeaker having enhanced response at bass frequencies |
US4968044A (en) * | 1987-12-14 | 1990-11-06 | P And C Engineering And Development | Rotary facial seal and bearing assembly |
DE3805443A1 (de) * | 1988-02-22 | 1989-08-31 | Gelenkwellenbau Gmbh | Dichtung, insbesondere radialwellendichtung oder manschettendichtung |
DE3806258C1 (de) * | 1988-02-27 | 1989-04-20 | Gelenkwellenbau Gmbh, 4300 Essen, De | |
DE3806397A1 (de) * | 1988-02-29 | 1989-09-28 | Gkn Cardantec | Lagerungsanordnung fuer ein zapfenkreuz eines kreuzgelenkes |
DE8805833U1 (de) * | 1988-05-03 | 1988-07-21 | SKF GmbH, 8720 Schweinfurt | Dichtungsring für Lager, insbesondere für Lagerbüchsen von Kreuzgelenken |
DE3824212A1 (de) * | 1988-07-16 | 1990-01-18 | Schaeffler Waelzlager Kg | Dichtungsanordnung fuer eine lagerbuechse |
DE4018216A1 (de) * | 1990-06-07 | 1991-12-12 | Goetze Ag | Wellendichtungsring |
DE9014393U1 (de) * | 1990-10-17 | 1991-01-03 | SKF GmbH, 8720 Schweinfurt | Lagerbüchse, insbesondere für Kreuzgelenke |
DE4114071C2 (de) * | 1991-04-30 | 1994-02-17 | Goetze Ag | Wellendichtungsring |
DE4128179A1 (de) * | 1991-08-24 | 1993-02-25 | Skf Gmbh | Abdichtung fuer lagerbuechsen, insbesondere fuer kreuzgelenke |
DE4225556C2 (de) * | 1992-08-03 | 1995-05-04 | Freudenberg Carl Fa | Zwischen radial nach innen weisenden Vorsprüngen einer Zylinderfläche abgestützte Stangenführung |
-
1994
- 1994-04-08 DE DE4412132A patent/DE4412132C5/de not_active Expired - Lifetime
-
1996
- 1996-05-13 US US08/645,128 patent/US5597356A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE4412132A1 (de) | 1995-10-12 |
DE4412132C5 (de) | 2005-07-28 |
US5597356A (en) | 1997-01-28 |
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