US3735451A - Seam for paper felts - Google Patents

Seam for paper felts Download PDF

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Publication number
US3735451A
US3735451A US00189436A US3735451DA US3735451A US 3735451 A US3735451 A US 3735451A US 00189436 A US00189436 A US 00189436A US 3735451D A US3735451D A US 3735451DA US 3735451 A US3735451 A US 3735451A
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hooks
groups
seam
felt
loops
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Expired - Lifetime
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US00189436A
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J Haythornthwaite
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Scapa Inc
Seapa Dryers Inc
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Seapa Dryers Inc
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Assigned to SCAPA INC., A CORP OF GA reassignment SCAPA INC., A CORP OF GA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCAPA GROUP INC. (F/K AS SCAPA DRYER, INC.)
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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
    • F16GBELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G3/00Belt fastenings, e.g. for conveyor belts
    • F16G3/02Belt fastenings, e.g. for conveyor belts with series of eyes or the like, interposed and linked by a pin to form a hinge
    • F16G3/04Belt fastenings, e.g. for conveyor belts with series of eyes or the like, interposed and linked by a pin to form a hinge in which the ends of separate U-shaped or like eyes are attached to the belt by parts penetrating into it
    • 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
    • Y10T24/00Buckles, buttons, clasps, etc.
    • Y10T24/16Belt fasteners
    • Y10T24/1608Hinged
    • Y10T24/1636Wire knuckles, common pintle

Definitions

  • Haythornthwaite 4 1 May 29, 1973 SEAM FOR PAPER FELTS [75] Inventor: James Haythornthwaite,
  • ABSTRACT A clipper seam wherein the hooks for joining the ends of felts are arranged in alternating groups such that a limited number of hooks will be brought into rubbing engagement by lateral shifting or bowing of the ends of the fe1ts 4 Claims, 2 Drawing Figures PA-TENTEB MAY 2 9 I973 Fl G.
  • the conventional clipper seam for joining the ends of paper makers dryer felts and the like comprises a number of wire hooks which are clinched side-by-side in spaced parallel relation to the adjacent ends of the felt or felts which are to be joined or in lengths of webbing stitched to the respective ends of the felt or felts.
  • the hooks which have loops at their ends, alternate from one side and then the other so that their ends intermesh.
  • a lacing wire is threaded through the loops to connect the hooks and hence to provide a hinge.
  • the clipper seam prefferably be set at right angles to the selvages of the felt so that the hooks are at right angles to the ends of the felt and so that under tension the load exerted by the hooks on the lacing wire is spread substantially equally along the length of the seam.
  • the seam develops a configuration such that it no longer runs at right angles to the selvages across its full width. This configuration is commonly known as bowing or running-out-of-square and it is invariably accompanied by a loss of overall width of the felt and seam.
  • the hooks used in the clipper seam are capable of re-alignment by pivoting about their ends which are embedded in the felt or webbing. This re-alignment of the hooks increases the number of hooks per linear inch of the seam when con sidered at right angles to the selvages and decreases the amount of space between adjacent hooks.
  • the object of this invention is to so space the hooks in the clipper seam that even if severe bowing or running-out-of-square occurs only a limited number of hooks stand any change of contacting hooks on the opposite edge of the seam.
  • the foregoing problems are minimized by providing at the adjacent ends of the dryer felt hooks set into the ends in groups of three or more which alternate first from one end and then from the other end and so that the loops of the alternating groups form a continuous passage through which a lacing wire or wires is adapted to be inserted to provide a hinge.
  • the groups of hooks are in turn uniformly spaced and the distance between the adjacent groups is slightly greater than the distance between the adjacent hooks in a group.
  • FIG. l is an enlarged fragmentary plan view at the adjacent ends of a dryer felt showing the seam constructed according to this invention.
  • FIG. 2 is a section taken on the line 2-2 of FIG. 1
  • FIG. 1 shows the adjacent ends 10 and T2 of a dryer felt or felts joined by a seam M which is designed especially to minimize the contact of the hooks joining the adjacent ends of the felt or felts in spite of bowing and/or misalignment of the ends by arranging the hooks in groups 16, of three hooks which alternate first from one end of the felt and then from the adjacent other end of the felt.
  • the hooks in each group are set into the end of the felt to which they are attached in uniformly spaced parallel relation with their distal ends extending across toward the end of the felt at the other side of the seam and coextensive.
  • Each hook comprises upper and lower limbs 22, 2d joined at one end by an integral loop 26 and provided at their opposite ends with prongs 28 and 30, the latter being set into opposite surfaces of the felt and clinched.
  • the loops 26 at the distal ends of the hooks of the alternating groups collectively provide a transverse passage 32 through which a lacing wire or wires 3 5 is adapted to be inserted to thereby hingedly connect the adjacent ends of the felt.
  • the adjacent ends of the felts may be reinforced by means of lengths of webbing fixed to the respective ends for receiving the prongs 2d, 3d.
  • a clipper seam for hingedly joining the adjacent ends of dryer felts comprising groups of wire connectors in which the wires in each group are closely adjacent and the groups alternate from opposite sides of the seam, each wire connector having a loop and a long and short leg terminating in hooks, said wire connectors being secured to the adjacent ends of the felt with the legs disposed in engagement with the opposite surfaces at the ends and the hooks buried in the ends and with the loops projecting from the ends in overlapping relation from opposite sides of the seam such that the centers of the loops lie along a common line transversely of the web midway between the ends and collectively define a transverse passage in which is mounted a flexible hinge element, and wherein the loops are arranged in groups of three, alternating from first one end and then the other and wherein the connector wires in each group are set in uniformly closely spaced parallel relation to each other and perpendicular to the plane of the felt.
  • a clipper seam according to claim 1, wherein the flexible hinge element is comprised of a pair of lacing wires, the combined diameters of which do not exceed the diameter of the passage constituted by said loops.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

A clipper seam wherein the hooks for joining the ends of felts are arranged in alternating groups such that a limited number of hooks will be brought into rubbing engagement by lateral shifting or bowing of the ends of the felts.

Description

United States Patent [191 Haythornthwaite [4 1 May 29, 1973 SEAM FOR PAPER FELTS [75] Inventor: James Haythornthwaite,
Quebec, Canada .loliette,
[73] Assignee: Seapa Dryers, lnc., Waycross, Ga.
[22] Filed: Oct. 14, 1971 [21] Appl. No.: 189,436
[52] US. Cl ..24/33, 24/207, 74/231 J [51] Int. Cl ..Fl6g 3/02 [58] Field of Search ..24/33 C, 33 M, 33 V, 24/205 G, 207, 205.19, 31 R; 74/231 .1;
[56] References Cited UNITED STATES PATENTS Diamond ..24/33 C 2,145,455 1/1939 Olsen ..24/33 M FOREIGN PATENTS OR APPLICATIONS 476,175 12/1937 Great Britain ..24/31 V Primary Examiner-James T. McCall Assistant Examinerl(enneth J. Dorner Attorney-Robert T. Gammons et a1.
[57] ABSTRACT A clipper seam wherein the hooks for joining the ends of felts are arranged in alternating groups such that a limited number of hooks will be brought into rubbing engagement by lateral shifting or bowing of the ends of the fe1ts 4 Claims, 2 Drawing Figures PA-TENTEB MAY 2 9 I973 Fl G. I
FIGZ
1 SEAM ron PAPER rams BACKGROUND OF THE INVENTION The conventional clipper seam for joining the ends of paper makers dryer felts and the like comprises a number of wire hooks which are clinched side-by-side in spaced parallel relation to the adjacent ends of the felt or felts which are to be joined or in lengths of webbing stitched to the respective ends of the felt or felts. The hooks, which have loops at their ends, alternate from one side and then the other so that their ends intermesh. A lacing wire is threaded through the loops to connect the hooks and hence to provide a hinge. It is customary for the clipper seam to be set at right angles to the selvages of the felt so that the hooks are at right angles to the ends of the felt and so that under tension the load exerted by the hooks on the lacing wire is spread substantially equally along the length of the seam. When dryer felts are in use travelling around the cylinders and rolls in a paper or board machine at high speed, it is often found that the seam develops a configuration such that it no longer runs at right angles to the selvages across its full width. This configuration is commonly known as bowing or running-out-of-square and it is invariably accompanied by a loss of overall width of the felt and seam. Due to the longitudinal tensions applied to dryer felts during running the most natural alignment of the hooks in the seam is parallel to the selvages so that when the seam becomes misaligned the hooks strive to remain parallel to the selvages even when the seam is out of square. The hooks used in the clipper seam are capable of re-alignment by pivoting about their ends which are embedded in the felt or webbing. This re-alignment of the hooks increases the number of hooks per linear inch of the seam when con sidered at right angles to the selvages and decreases the amount of space between adjacent hooks. In case of se vere misalignment hooks are forced against adjacent hooks at the opposite side of the seam and commence rubbing together during the continual flexing and pivoting of ,the hooks around the lacing wire while the felt is running. This rubbing and the increased possibility of corrosion occurring in the contacting area of the metal hooks has lead to the failure of hooks in many clipper seams. The failure of the hooks has resulted in complete failure of the clipper seam and loss of felt before its full service lift has been realized.
This probelm of short life of the clipper seam relative to the service life available from the modern dryer felts has become more acute as improved materials and workmanship have been incorporated into the felts providing for longer service life of the felts.
The object of this invention is to so space the hooks in the clipper seam that even if severe bowing or running-out-of-square occurs only a limited number of hooks stand any change of contacting hooks on the opposite edge of the seam.
SUMMARY As herein illustrated, the foregoing problems are minimized by providing at the adjacent ends of the dryer felt hooks set into the ends in groups of three or more which alternate first from one end and then from the other end and so that the loops of the alternating groups form a continuous passage through which a lacing wire or wires is adapted to be inserted to provide a hinge. The groups of hooks are in turn uniformly spaced and the distance between the adjacent groups is slightly greater than the distance between the adjacent hooks in a group.
The invention will now be described in greater detail with reference to the accompanying drawings wherein:
FIG. l is an enlarged fragmentary plan view at the adjacent ends of a dryer felt showing the seam constructed according to this invention; and
FIG. 2 is a section taken on the line 2-2 of FIG. 1
Referring to the drawings, FIG. 1 shows the adjacent ends 10 and T2 of a dryer felt or felts joined by a seam M which is designed especially to minimize the contact of the hooks joining the adjacent ends of the felt or felts in spite of bowing and/or misalignment of the ends by arranging the hooks in groups 16, of three hooks which alternate first from one end of the felt and then from the adjacent other end of the felt. The hooks in each group are set into the end of the felt to which they are attached in uniformly spaced parallel relation with their distal ends extending across toward the end of the felt at the other side of the seam and coextensive. Each hook comprises upper and lower limbs 22, 2d joined at one end by an integral loop 26 and provided at their opposite ends with prongs 28 and 30, the latter being set into opposite surfaces of the felt and clinched. The loops 26 at the distal ends of the hooks of the alternating groups collectively provide a transverse passage 32 through which a lacing wire or wires 3 5 is adapted to be inserted to thereby hingedly connect the adjacent ends of the felt.
As illustrated in the drawings, the adjacent ends of the felts may be reinforced by means of lengths of webbing fixed to the respective ends for receiving the prongs 2d, 3d.
As thus constructed, bowing or running-out-ofsquare will dispose the hooks within each group in somewhat closer relation to each other but will not change the parallelism between hooks within a group and so no rubbing between hooks in a group will take place in spite of bowing or misalignment. Between groups there is less chance of rubbing because the spacing between groups is somewhat greater than the spacing between the wires in each group and only the hooks at the outer sides in adjacent groups can possibly have contact. Since even under the most severe bowing only the outer hooks in adjacent groups can rub, the wear when groups of three hooks are employed is reduced by about one-third (la) which increases the life expectancy of the felt by at least 30 percent. Groups of more than three may be employed with a corresponding proportionate increase in the life expectancy of the felt,
the maximum number of hooks being limited, of course, by the tendency for the portions of the felts between groups sagging.
By this arranging the wires in groups rather than aiternating the wires from first one end to the other wear and corrosion of the hooks is minimized and thus the longevity of expensive and specially prepared felts is preserved. This grouping of the hooks also facilitates more rapid closure than with a seam employing hooks which are intermeshed singly.
It should be understood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents falling within the scope of the appended claims.
I claim:
1. A clipper seam for hingedly joining the adjacent ends of dryer felts comprising groups of wire connectors in which the wires in each group are closely adjacent and the groups alternate from opposite sides of the seam, each wire connector having a loop and a long and short leg terminating in hooks, said wire connectors being secured to the adjacent ends of the felt with the legs disposed in engagement with the opposite surfaces at the ends and the hooks buried in the ends and with the loops projecting from the ends in overlapping relation from opposite sides of the seam such that the centers of the loops lie along a common line transversely of the web midway between the ends and collectively define a transverse passage in which is mounted a flexible hinge element, and wherein the loops are arranged in groups of three, alternating from first one end and then the other and wherein the connector wires in each group are set in uniformly closely spaced parallel relation to each other and perpendicular to the plane of the felt.
2. A clipper seam according to claim 1, wherein the groups of wire hooks are uniformly spaced.
3. A clipper seam according to claim 1, wherein the flexible hinge element is comprised of a pair of lacing wires, the combined diameters of which do not exceed the diameter of the passage constituted by said loops.
4. A clipper seam according to claim 1, wherein the groups of hooks are uniformly spaced with the spacing between groups greater than the distance between hooks within the groups.

Claims (4)

1. A clipper seam for hingedly joining the adjacent ends of dryer felts comprising groups of wire connectors in which the wires in each group are closely adjacent and the groups alternate from opposite sides of the seam, each wire connector having a loop and a long and short leg terminating in hooks, said wire connectors being secured to the adjacent ends of the felt with the legs disposed in engagement with the opposite surfaces at the ends and the hooks buried in the ends and with the loops prOjecting from the ends in overlapping relation from opposite sides of the seam such that the centers of the loops lie along a common line transversely of the web midway between the ends and collectively define a transverse passage in which is mounted a flexible hinge element, and wherein the loops are arranged in groups of three, alternating from first one end and then the other and wherein the connector wires in each group are set in uniformly closely spaced parallel relation to each other and perpendicular to the plane of the felt.
2. A clipper seam according to claim 1, wherein the groups of wire hooks are uniformly spaced.
3. A clipper seam according to claim 1, wherein the flexible hinge element is comprised of a pair of lacing wires, the combined diameters of which do not exceed the diameter of the passage constituted by said loops.
4. A clipper seam according to claim 1, wherein the groups of hooks are uniformly spaced with the spacing between groups greater than the distance between hooks within the groups.
US00189436A 1971-10-14 1971-10-14 Seam for paper felts Expired - Lifetime US3735451A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4344209A (en) * 1979-10-22 1982-08-17 Scapa Dryers, Inc. In-line clipper seam
US4364421A (en) * 1977-08-30 1982-12-21 Wangner Systems Corporation Woven textile dryer fabric and seam and weaving method
US4708558A (en) * 1986-02-21 1987-11-24 Flexible Steel Lacing Company Wire fastener
US4806208A (en) * 1987-10-14 1989-02-21 Asten Group, Inc. Method of seaming a seamed felt on a papermaking machine with oppositely tapered pintle elements
US6453521B1 (en) * 2001-03-08 2002-09-24 Delphi Oracle Corp. Multiple pitch zipper
US20030150698A1 (en) * 2002-02-14 2003-08-14 Wolfgang Herold Belt connector and method
US20040143937A1 (en) * 2003-01-25 2004-07-29 Allen Richard F. Clipper seams
US20050015944A1 (en) * 2003-06-18 2005-01-27 Arc'teryx Equipment Inc. Interdigitating quick release web fastener
US20080289716A1 (en) * 2007-05-23 2008-11-27 CROOK Robert Low tensile creep belt
US10746256B2 (en) * 2015-07-08 2020-08-18 Contitech Transportbandsysteme Gmbh Belt or belt segment
US10767728B2 (en) * 2015-07-29 2020-09-08 Contitech Transportbandsysteme Gmbh Belt or belt segment

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932203A (en) * 1933-05-26 1933-10-24 Clipper Belt Lacer Company Joint or seam construction for drier felts and the like
GB476175A (en) * 1936-06-02 1937-12-02 Hugh Wood And Company Ltd Improvements in or relating to fasteners for belts for transmitting power or for conveying purposes
US2145455A (en) * 1937-10-05 1939-01-31 Flexible Steel Lacing Co Flexible belt fastener

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932203A (en) * 1933-05-26 1933-10-24 Clipper Belt Lacer Company Joint or seam construction for drier felts and the like
GB476175A (en) * 1936-06-02 1937-12-02 Hugh Wood And Company Ltd Improvements in or relating to fasteners for belts for transmitting power or for conveying purposes
US2145455A (en) * 1937-10-05 1939-01-31 Flexible Steel Lacing Co Flexible belt fastener

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364421A (en) * 1977-08-30 1982-12-21 Wangner Systems Corporation Woven textile dryer fabric and seam and weaving method
US4344209A (en) * 1979-10-22 1982-08-17 Scapa Dryers, Inc. In-line clipper seam
US4708558A (en) * 1986-02-21 1987-11-24 Flexible Steel Lacing Company Wire fastener
US4806208A (en) * 1987-10-14 1989-02-21 Asten Group, Inc. Method of seaming a seamed felt on a papermaking machine with oppositely tapered pintle elements
US6453521B1 (en) * 2001-03-08 2002-09-24 Delphi Oracle Corp. Multiple pitch zipper
US6604263B1 (en) 2001-03-08 2003-08-12 Delphi Oracle Corp. Multiple pitch zipper
US6681456B1 (en) 2001-03-08 2004-01-27 Delphi Oracle Corp. Zipper stringer having coupling elements with variable properties
US6896124B2 (en) * 2002-02-14 2005-05-24 Mato Maschinen-Und Metallwarenfabrik Curt Matthaei Gmbh & Co. Kg Belt connector and method
US20030150698A1 (en) * 2002-02-14 2003-08-14 Wolfgang Herold Belt connector and method
US20040143937A1 (en) * 2003-01-25 2004-07-29 Allen Richard F. Clipper seams
US20050015944A1 (en) * 2003-06-18 2005-01-27 Arc'teryx Equipment Inc. Interdigitating quick release web fastener
US7694862B2 (en) * 2003-06-18 2010-04-13 Arc'teryx Equipment Inc. Interdigitating quick release web fastener
US20080289716A1 (en) * 2007-05-23 2008-11-27 CROOK Robert Low tensile creep belt
US7513277B2 (en) * 2007-05-23 2009-04-07 Voith Patent Gmbh Low tensile creep belt
US10746256B2 (en) * 2015-07-08 2020-08-18 Contitech Transportbandsysteme Gmbh Belt or belt segment
US10767728B2 (en) * 2015-07-29 2020-09-08 Contitech Transportbandsysteme Gmbh Belt or belt segment

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AS Assignment

Owner name: SCAPA INC., P.O. BOX 1949, WAYCROSS, GA 31508 A C

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SCAPA GROUP INC. (F/K AS SCAPA DRYER, INC.);REEL/FRAME:004182/0784

Effective date: 19830511