US2862283A - Anti-friction fabric - Google Patents

Anti-friction fabric Download PDF

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Publication number
US2862283A
US2862283A US662071A US66207157A US2862283A US 2862283 A US2862283 A US 2862283A US 662071 A US662071 A US 662071A US 66207157 A US66207157 A US 66207157A US 2862283 A US2862283 A US 2862283A
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United States
Prior art keywords
yarns
filler
ply
fabric
teflon
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
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US662071A
Inventor
Lawrence J Rasero
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RUSSELL Manufacturing CO
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RUSSELL Manufacturing CO
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Priority to US662071A priority Critical patent/US2862283A/en
Application granted granted Critical
Publication of US2862283A publication Critical patent/US2862283A/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime legal-status Critical

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16CSHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02Parts of sliding-contact bearings
    • F16C33/04Brasses; Bushes; Linings
    • F16C33/20Sliding surface consisting mainly of plastics
    • F16C33/201Composition of the plastic
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D25/00Woven fabrics not otherwise provided for
    • DTEXTILES; PAPER
    • D03WEAVING
    • D03DWOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D2700/00Woven fabrics; Methods of weaving; Looms
    • D03D2700/01Woven fabrics; General weaving methods
    • D03D2700/0155Industrial fabrics
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S384/00Bearings
    • Y10S384/90Cooling or heating
    • Y10S384/911Cooling or heating including fiber
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49636Process for making bearing or component thereof
    • Y10T29/49643Rotary bearing
    • Y10T29/49647Plain bearing
    • Y10T29/49668Sleeve or bushing making
    • Y10T29/49677Sleeve or bushing making having liner
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49636Process for making bearing or component thereof
    • Y10T29/4971Nonmetallic bearing element
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T442/00Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
    • Y10T442/30Woven fabric [i.e., woven strand or strip material]
    • Y10T442/3179Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
    • Y10T442/3195Three-dimensional weave [e.g., x-y-z planes, multi-planar warps and/or wefts, etc.]
    • Y10T442/3211Multi-planar weft layers

Description

ANTI-FRICTION FABRIC Lawrence J. Rascro, Middletown, Conn., asslgnor to The Russell Manufacturing Company, Mlddletovm, Conn., a corporation of Connecticut This invention relates to fabrics and more particularly to a fabric having an anti-friction surface.

An object is to provide a fabric suitable for use in bearings, bushings, airplane ski liners and other parts having sliding surfaces.

Another object is to provide a fabric having anti-icing properties for such uses as air intake ducts, venturis, the leading edges of airplane wings or the like.

Another object is to provide a fabric construction wherein yarns composed of anti-friction material are bound into a backing which is adapted to be bonded by an imprcgnant to a supporting surface and which is moldable when impregnated'with a phenolic resin or the like to form a rigid, self -sustaiuing product.

Other objects and advantages will be apparent as the nature of the invention is more fully disclosed.

It has been found that Teflon, a tetrafluorethyleneproduct, has such a low coefficient of friction that it will not adhere to other materials and cannot be bonded by the usual impregnants or adhesives. For the same reason it is especially adapted to the uses above named. It forms a bearing surface which requires no lubrication. Also since it will not adhere to ice it forms a superior liner for vehicle skis or runners and for other purposes where icing is to be eliminated.

However. by reason of these characteristics it is diflicult to fabricate Teflon into a surface layer which is permanent in form and can be attached by a bonding impregnant to a supporting member.

A further object of the present invention is to provide a fabric construction which overcomes the above difliculties and is capable of being physically bonded.

In a specific embodiment this is accomplished by weaving a multi-ply fabric in which the Teflon yarns are disposed as floats on one surface and are bound under spaced filler yarns in both the upper ply and the second ply. The filler yarns of the third and subsequent plies are bound by chains of a material capable of bonding to an impregnant, such as cotton or spun Dacron, and the various plies are bound together by spaced crossed chains. The filler yarns are composed of a material having a high tensile strength, such as nylon, high tenacity rayon, continuous filament Dacron or the like.

With this construction the fabric retains an impregnant and can be bonded to a supporting surface or molded. The Teflon is mechanically bound to the fabric plies and is retained in place thereby.

The nature of the invention will be better understood from the following description, taken in connection with the accompanying drawing in which a specific embodiment has been set forth for purposes of illustration.

In the drawing:

Fig. l is an expanded sectional view of an enlarged scale, illustrating a fabric embodying the present invention; and

Fig. 2 is a top plan view of the fabric.

Refcrringto the drawing more in detail the fabric is 2,362,283 Patented Dec. 2, 1958 shown as comprising four plies or rows of filler yarns 1, 2, 3 and 4, respectively.

In each dent the warpwise yarns comprise a first Teflon yarn 10 which passes over two filler yarns 1 and undera third filler yarn 1 to form floats 11 on the upper surface of the fabric. A second Teflon yarn 12 passes over two filler yarns l to form floats 13 and under a third filler yarn l of the upper ply and also under a filler yarn 2 of the second ply which lies directly beneath the third filler yarn l of the upper ply so as to bond the first ply to the second ply.

The second dent includes a Teflon yarn 14 which is woven over two filler yarns l to form floats 15 and under a third filler yarn l, and a third Teflon yarn 16 passing over two filler yarns l to form floats 17 and then under a third filler yarn l and under a filler yarn 2 of the second ply. The weave of the second dent is similar to the first dent but is displaced by one filler shot.

The third dent includes a pair of Teflon yarns l8 and 20 woven to form floats 19 and 21 and bound under the filler yarns of the first and second plies as above described but displaced by one filler shot from the Teflon yarns 14 and 16, the surface appearance being similar to a twill weave.

Of course the length of the floats and the sequence of the Teflon yarns may be varied as desired. The weave provides exposed Teflon yarns on the surface which are mechanically bound in place by the filler yarns of both the upper and the second plies.

The second and third plies are bound in one dent by warps 24 and 25 which pass under and over every second filler yarn 2 and 3, crossing between the plies. Other warp yarns 26 and 27 of a second dent, shown by dotted lines for clarity, are similarly disposed but are displaced by one filler shot from the warp yarns 24 and 25. The warp yarns of the third and subsequent dents will repeat the pattern of the first two dents above described.'

The third and fourth plies are bound together by crossed warp yarns 28 and 29 which pass under and over every second filler yarn 3 and 4, respectively. Similar warp yarns 30 and 31 in a second dent are displaced by one filler shot from the warp yarns 28 and 29. Warp yarns of the third and subsequent dents will be disposed to repeat the pattern of the first and second dents above described. The filler yarns 4 are bound by a single yarn 32 and 33 in the respective dents which cooperate with the yarns 28 to 31 to form chains.

The filler yarns 1 to 4 are preferably composed of a material having a high tensile strength such as nylon or high tenacity rayon. The warp yarns 24 to 31 and chains 32 and 33 may be composed ofa material capable of being bonded to an impregnant, such as cotton or spun Dacron.

While four plies have been shown it is to be understood that the number of plies may be varied in accordance with the required thickness of the product.

In use the fabric is impregnated with a phenolic resin or the like which is moldable under heat and pressure into a rigid structure. When the fabric is so impregnated and cured under heat and pressure the various yarns and plies will be secured in place but as the impregnant will not bond to the Teflon. the Teflon surface remains exposed.

The fabric can be used as a bearing surface, or as a liner for air ducts or venturis which are subject to icing, as a liner for airplane wings, as a liner for vehicle skis or as bushings or bearings or for various other purposes as will be apparent to a person skilled in the art.

What is claimed is:

l. A fabric having an anti-friction surface comprising a plurality of plies or layers of filler yarns, warpwise yarns having anti-friction characteristics woven over at least two adjacent filler yarns of the upper ply to form surface floats, certain of said warpwise yarns being bound between floats under upper ply filler shots and other of said warpwise yarns being bound between floats under filler shots in the second ply to bind said upper ply and second ply together, and other warpwise yarns binding the filler yarns of said second ply and a third ply.

2. A fabric as set forth in claim 1 in which said antifriction yarns are composed of Teflon.

3. A fabric as set forth in claim 2 in which said filler yarns are composed of nylon.

4. A fabric as set forth in claim 3 in which said other warprise yarns are composed of a material capable of bonding to an impregnant.

5. A fabric as set forth in claim 4 having a heat set phenolic resin impregnant bonding said plies into a rigid structure with said Teflon yarns exposed at the surface thereof.

6. A fabric composed of filler yarns disposed in at least three plies, Teflon warp yarns woven as surface floats spanning a plurality of upper ply filler shots and bound under other upper ply filler shots, other Teflon warp yarns woven as floats spanning a plurality of upper ply filler 4 r yarns and bound under spaced second ply filler yarns, other warp yarns forming chains extending between second ply filler yarns and third ply filler yarns to bond said plies together, other chain yarns bonding the filler yarns of the bottom ply, said other warp yarns and said chain yarns being composed of a material capable of bonding to an impregnant, and a heat set phenolic type resin impregnating said fabric and bonding the same in a rigid structure with said floats of Teflon yarn exposed at the upper surface thereof.

References Cited in the file of this patent UNITED STATES PATENTS 1,471,224 Weaver Oct. 16, 1923 2,536,974 Chagnon Ian. 2, 1951 2,540,874 Geddings Feb. 6, 1951 2,804,886 White Sept. 3, 1957 FOREIGN PATENTS 403,372 Great Britain Dec. 13, 1933

Claims (1)

1. A FABRIC HAVING AN ANTI-FRICTION SURFACE COMPRISING A PLURALITY OF PLIES OF LAYERS OF FILLER YARNS, WARPWISE YARNS HAVING ANTI-FRICTION CHARACTERISTICS WOVEN OVER AT LEAST TWO ADJACENT FILLER YARNS OF THE UPPER PLY TO FORM SURFACE FLOATS, CERTAIN OF SAID WARPWISE YARNS BEING BOUND BETWEEN FLOATS UNDER UPPER PLY FILLER SHOTS AND OTHER OF SAID WARPWISE YARNS BEING BOUND BETWEEN FLOATS UNDER FILLER SHOTS IN THE SECOND PLY TO BIND SAID UPPER PLY AND SECOND PLY TOGETHER, AND OTHER WARPWISE YARNS BINDING THE FILLER YARNS OF SAID SECOND PLY AND A THIRD PLY.
US662071A 1957-05-28 1957-05-28 Anti-friction fabric Expired - Lifetime US2862283A (en)

Priority Applications (1)

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US662071A US2862283A (en) 1957-05-28 1957-05-28 Anti-friction fabric

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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910329A (en) * 1958-01-10 1959-10-27 Russell Mfg Co Sealing ring and thrust bearing
US2983562A (en) * 1958-05-01 1961-05-09 Russell Mfg Co Oilless non-corrosive bearing
US2994223A (en) * 1958-11-06 1961-08-01 Standard Thomson Corp Actuating device
US3000076A (en) * 1957-12-05 1961-09-19 Russell Mfg Co Loom picker and bearing
US3067484A (en) * 1959-09-10 1962-12-11 Russell Mfg Co Fabric web
US3154384A (en) * 1960-04-13 1964-10-27 Texas Instruments Inc Apparatus for growing compound semiconductor crystal
US3328100A (en) * 1964-03-17 1967-06-27 Abex Corp Bearings
US3368664A (en) * 1966-10-04 1968-02-13 Hewitt Robins Inc Conveyor belt with improved troughing characteristics
DE2147397A1 (en) * 1970-12-01 1972-06-22 Textron Inc
DE2302206A1 (en) * 1972-01-20 1973-07-26 Textron Inc Bearing liner or jack of a braiding
US3804479A (en) * 1972-12-21 1974-04-16 Rexnord Inc Low friction fabric-lined bearings and improved fabric therefor
US3844195A (en) * 1972-05-26 1974-10-29 Du Pont Products
US3950599A (en) * 1974-02-21 1976-04-13 New Hampshire Ball Bearings, Inc. Low-friction laminate liner for bearings
US3957090A (en) * 1972-09-05 1976-05-18 Muhlen Sohn Hygroscopic transporting web
US3974009A (en) * 1969-05-21 1976-08-10 Rex Chainbelt Inc. Method for making ball and socket type bearings in multiple
US4107381A (en) * 1973-09-18 1978-08-15 Rexnord Inc. Composite article providing seamless fabric-lined bearings in multiple
US4302197A (en) * 1978-09-13 1981-11-24 Tsubakimoto Chain Co. Toothed belt
EP0251217A2 (en) * 1986-07-02 1988-01-07 Vorwerk & Co. Interholding GmbH Building element made from a laminated multilayer fabric
US4894108A (en) * 1988-10-17 1990-01-16 General Motors Corporation Method of forming a composite leaf spring with fabric wear pad
US5646076A (en) * 1979-12-21 1997-07-08 Bortz; David N. Friction controlling devices and methods of their manufacture
USRE35777E (en) * 1989-02-10 1998-04-28 Huyck Licensco, Inc. Self stitching multilayer papermaking fabric
US5952067A (en) * 1996-12-02 1999-09-14 A&P Technology, Inc. Braided structure having uncrimped strands
US5975149A (en) * 1998-08-11 1999-11-02 Asten, Inc. Multilayer press fabric including long floats of high temperature MD yarns in the paper support layer
DE19845442A1 (en) * 1998-10-02 2000-04-20 Cyril Xavier Latty packing
US20040091714A1 (en) * 1999-11-15 2004-05-13 Gunn Robert T. Compositions with low coefficients of friction and methods for their preparation
US20050191474A1 (en) * 2003-10-09 2005-09-01 Gunn Robert T. Compositions with low coefficients of friction and methods for their preparation
EP1813835A3 (en) * 2006-01-31 2008-03-26 Mitsuboshi Belting Ltd. Toothed power transmission belt with cloth component thereon
US20080121305A1 (en) * 2001-10-31 2008-05-29 Metzger Michael B Low friction fabric
US20110219618A1 (en) * 2006-07-07 2011-09-15 Gerald Thomas Lien Sleeve bearing assembly and method of construction
US20110314676A1 (en) * 2006-07-07 2011-12-29 James Benjamin B Sleeve bearing assembly and method of construction
US20120073854A1 (en) * 2010-09-23 2012-03-29 Allen Jerry L Conduit innerduct having reduced friction and high strength
US20130206276A1 (en) * 2011-07-12 2013-08-15 Nippon Filcon Co., Ltd. Joining loop structure of industrial multilayer fabric

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3781205A (en) * 1970-02-02 1973-12-25 Garlock Inc Composite bearings
DE102016014816B4 (en) * 2016-12-13 2019-02-28 Robert Lorenz Bearing assembly with maintenance-free fiber overlay

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1471224A (en) * 1921-07-21 1923-10-16 William I Weaver Padding for the covering of flatwork ironers
GB403372A (en) * 1931-09-10 1933-12-13 Paul Dehler Improvements in or relating to the weaving of ribbed jacquard fabrics
US2536974A (en) * 1947-03-11 1951-01-02 Albany Felt Co Compressive shrinking and finishing blanket
US2540874A (en) * 1949-05-25 1951-02-06 Geddings Saint Julian Felt for papermaking machines
US2804886A (en) * 1955-11-04 1957-09-03 Charles S White Low friction fabric material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1471224A (en) * 1921-07-21 1923-10-16 William I Weaver Padding for the covering of flatwork ironers
GB403372A (en) * 1931-09-10 1933-12-13 Paul Dehler Improvements in or relating to the weaving of ribbed jacquard fabrics
US2536974A (en) * 1947-03-11 1951-01-02 Albany Felt Co Compressive shrinking and finishing blanket
US2540874A (en) * 1949-05-25 1951-02-06 Geddings Saint Julian Felt for papermaking machines
US2804886A (en) * 1955-11-04 1957-09-03 Charles S White Low friction fabric material

Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3000076A (en) * 1957-12-05 1961-09-19 Russell Mfg Co Loom picker and bearing
US2910329A (en) * 1958-01-10 1959-10-27 Russell Mfg Co Sealing ring and thrust bearing
US2983562A (en) * 1958-05-01 1961-05-09 Russell Mfg Co Oilless non-corrosive bearing
US2994223A (en) * 1958-11-06 1961-08-01 Standard Thomson Corp Actuating device
US3067484A (en) * 1959-09-10 1962-12-11 Russell Mfg Co Fabric web
US3154384A (en) * 1960-04-13 1964-10-27 Texas Instruments Inc Apparatus for growing compound semiconductor crystal
US3328100A (en) * 1964-03-17 1967-06-27 Abex Corp Bearings
US3368664A (en) * 1966-10-04 1968-02-13 Hewitt Robins Inc Conveyor belt with improved troughing characteristics
US3974009A (en) * 1969-05-21 1976-08-10 Rex Chainbelt Inc. Method for making ball and socket type bearings in multiple
DE2147397A1 (en) * 1970-12-01 1972-06-22 Textron Inc
US3692375A (en) * 1970-12-01 1972-09-19 Textron Inc Composite plastic bearing and method for making the same
US3815468A (en) * 1972-01-20 1974-06-11 Textron Inc Braided fabric bearing liner
DE2302206A1 (en) * 1972-01-20 1973-07-26 Textron Inc Bearing liner or jack of a braiding
US3844195A (en) * 1972-05-26 1974-10-29 Du Pont Products
US3957090A (en) * 1972-09-05 1976-05-18 Muhlen Sohn Hygroscopic transporting web
US3804479A (en) * 1972-12-21 1974-04-16 Rexnord Inc Low friction fabric-lined bearings and improved fabric therefor
US4107381A (en) * 1973-09-18 1978-08-15 Rexnord Inc. Composite article providing seamless fabric-lined bearings in multiple
US3950599A (en) * 1974-02-21 1976-04-13 New Hampshire Ball Bearings, Inc. Low-friction laminate liner for bearings
US4302197A (en) * 1978-09-13 1981-11-24 Tsubakimoto Chain Co. Toothed belt
US5646076A (en) * 1979-12-21 1997-07-08 Bortz; David N. Friction controlling devices and methods of their manufacture
US5989375A (en) * 1979-12-21 1999-11-23 Bortz; David N. Friction controlling devices and methods of their manufacture
EP0251217A3 (en) * 1986-07-02 1990-03-07 Vorwerk & Co. Interholding Gmbh Building element made from a laminated multilayer fabric
EP0251217A2 (en) * 1986-07-02 1988-01-07 Vorwerk & Co. Interholding GmbH Building element made from a laminated multilayer fabric
US4894108A (en) * 1988-10-17 1990-01-16 General Motors Corporation Method of forming a composite leaf spring with fabric wear pad
USRE35777E (en) * 1989-02-10 1998-04-28 Huyck Licensco, Inc. Self stitching multilayer papermaking fabric
US5952067A (en) * 1996-12-02 1999-09-14 A&P Technology, Inc. Braided structure having uncrimped strands
US5975149A (en) * 1998-08-11 1999-11-02 Asten, Inc. Multilayer press fabric including long floats of high temperature MD yarns in the paper support layer
DE19845442A1 (en) * 1998-10-02 2000-04-20 Cyril Xavier Latty packing
US20040091714A1 (en) * 1999-11-15 2004-05-13 Gunn Robert T. Compositions with low coefficients of friction and methods for their preparation
US20080121305A1 (en) * 2001-10-31 2008-05-29 Metzger Michael B Low friction fabric
US20050191474A1 (en) * 2003-10-09 2005-09-01 Gunn Robert T. Compositions with low coefficients of friction and methods for their preparation
EP1813835A3 (en) * 2006-01-31 2008-03-26 Mitsuboshi Belting Ltd. Toothed power transmission belt with cloth component thereon
CN101070895B (en) 2006-01-31 2011-11-16 三之星机带株式会社 Toothed transfer belt with cloth
US20110219618A1 (en) * 2006-07-07 2011-09-15 Gerald Thomas Lien Sleeve bearing assembly and method of construction
US20110314676A1 (en) * 2006-07-07 2011-12-29 James Benjamin B Sleeve bearing assembly and method of construction
US8464427B2 (en) * 2006-07-07 2013-06-18 Federal-Mogul World Wide, Inc. Sleeve bearing assembly and method of construction
US20120073854A1 (en) * 2010-09-23 2012-03-29 Allen Jerry L Conduit innerduct having reduced friction and high strength
US20130206276A1 (en) * 2011-07-12 2013-08-15 Nippon Filcon Co., Ltd. Joining loop structure of industrial multilayer fabric
US8899276B2 (en) * 2011-07-12 2014-12-02 Nippon Filcon Co., Ltd. Joining loop structure of industrial multilayer fabric

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Publication number Publication date
DE1400041A1 (en) 1968-10-31
DE1400041B2 (en) 1970-02-26

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