WO2003054416A1 - Spirale permettant de raccorder les extremites des segments d'une courroie sans fin - Google Patents

Spirale permettant de raccorder les extremites des segments d'une courroie sans fin Download PDF

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Publication number
WO2003054416A1
WO2003054416A1 PCT/CA2001/001784 CA0101784W WO03054416A1 WO 2003054416 A1 WO2003054416 A1 WO 2003054416A1 CA 0101784 W CA0101784 W CA 0101784W WO 03054416 A1 WO03054416 A1 WO 03054416A1
Authority
WO
WIPO (PCT)
Prior art keywords
spiral
loops
monofilament
legs
pintle
Prior art date
Application number
PCT/CA2001/001784
Other languages
English (en)
Inventor
André Corriveau
Sylvain CRÊTE
Caroline Fraser
Jean-Sébastien PLANTE
Original Assignee
Lippert Pintlepin Mfg. Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lippert Pintlepin Mfg. Inc. filed Critical Lippert Pintlepin Mfg. Inc.
Priority to PCT/CA2001/001784 priority Critical patent/WO2003054416A1/fr
Priority to EP01275043A priority patent/EP1463897A1/fr
Priority to AU2002215762A priority patent/AU2002215762A1/en
Publication of WO2003054416A1 publication Critical patent/WO2003054416A1/fr

Links

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
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G3/00—Belt fastenings, e.g. for conveyor belts
    • F16G3/02—Belt fastenings, e.g. for conveyor belts with series of eyes or the like, interposed and linked by a pin to form a hinge
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0054—Seams thereof

Definitions

  • the present invention relates to a spiral for interconnecting ends of endless belt segments.
  • Segments of an endless belt have ends provided with sets of terminal fabric loops interdigitatable with one another so that the segments can be connected together by insertion of a pintle into the channel formed by the interdigitated sets of loops of two adjacent belt segments.
  • the sets of loops and the pintle are however subjected to high stresses and strains during operation of the endless belt, so their design and strength are of utmost importance as a loose segment or pintle may cause important damages to the machine or serious injuries to a passer-by.
  • the sets of loops are frequently provided by spirals seamed at the ends of the belt segments.
  • US patent no. 5,915,422 (Fagerholm) shows an example of such a spiral attached at the end of a woven (felt) belt. When viewed sideways, the spiral exhibits a series of V-shaped loops spaced from one another by straight sections especially intended to receive flat filament yarns for attachment of the spiral to the end of the belt section.
  • the interdigitation of two such spirals at the ends of adjacent belt sections is however uneven and unsteady due to the mismatching of the loops between the two interdigitated sets and the large spaces left between the loops for the yarns.
  • the interdigitation is frequently incomplete or partial as a result of the non-complementary shapes of the spirals, so the resulting channel has a reduced size compared to the size of the loops and thus only a small size pintle can disadvantageously be used instead of a larger size one. Furthermore, the pintle is prone to jam in or to deviate out of the channel due to its unevenness and irregularity.
  • An object of the invention is to provide a spiral for interconnecting ends of endless belt segments using a pintle, which better interdigitates with like spirals than the spirals of the prior art and which allows the use of a larger size pintle for interlocking the spirals together.
  • Another object of the invention is to provide such a spiral having loops that fully insert down to the bottom of a like spiral, and provide a fairly smooth and regular inner channel facilitating the insertion of the pintle.
  • Another object of the invention is to provide such a spiral which can be easily manufactured in a large range of sizes and models to fit multiple needs and applications.
  • Another object of the invention is to provide such a spiral which can be made according to a required pitch for easier assembly with the endless belt, with the pitch possibly ranging over twice the diameter of the monofilament used to form the spiral.
  • a spiral for interconnecting ends of endless belt segments with terminal fabric loops using a pintle.
  • the spiral comprises a series of loops having preformed inverted U-shaped loop portions extending in a transverse direction of the spiral.
  • the loop portions have front and rear parallel legs spaced apart from each other for passage of the pintle therebetween, and an uppermost head bending from and extending between the legs.
  • Preformed U-shaped loop linking portions extend diagonally with respect to a longitudinal direction of the spiral, between lower ends of the front legs and lower ends of the rear legs of the next loop portions respectively.
  • the loop portions are parallel with and spaced from one another by a definite pitch distance in the longitudinal direction of the spiral, adapted to match with the fabric loops at the ends of the endless belt segments and to define openings for interdigitation with a like spiral to form a channel for the pintle without longitudinal deformation of the spirals during interdigitation.
  • Each loop portion may have projections made out of the spiral on opposite sides of the loop portion in the longitudinal direction of the spiral, for interlocking with like projections on the like spiral.
  • the heads and the loop linking portions have substantially straight portions, so that the channel has a cross-section more rectangular than oblong.
  • the spiral according to the invention almost fully blends with a like spiral, which leaves more inner space for a larger pintle or for receiving a filling material, while facilitating the spiral assembly.
  • a process for producing the spiral characterized in that a monofilament made of a thermoformable material is wound around a rod having a cross-section reflecting a desired inner shape of the spiral.
  • the wound monofilament is press-shaped against the rod so that it forms a series of loops having the aforesaid features.
  • the press-shaped monofilament is subjected to a heating and cooling fixating cycle .
  • Figures 1A-B are front and side elevation views of a spiral according to the invention
  • Figures 2A-C are front and side elevation and top views of a spiral with interlocking heads according to the invention
  • Figure 3 is a perspective view illustrating a spiral according to the invention.
  • Figure 4 is a side elevation view illustrating two spirals with interlocking heads during interdigitation in order to interconnect ends of endless belt segments.
  • FIG. 1A-B and 3 there is shown a spiral according to the invention, for interconnecting ends of endless belt segments with terminal fabric loops using a pintle (not shown in the Figures) .
  • the spiral comprises a series of loops 2 each having a preformed inverted U-shaped loop portion 4 extending in a transverse direction of the 'spiral, as depicted by arrow 6 in Figure 3.
  • the loop portion 4 has front and rear parallel legs 8, 10 spaced apart from each other for passage of the pintle therebetween, as best shown in Figure 3.
  • the loop portion 4 has also an uppermost head 18 bending from and extending between the legs 8, 10.
  • Each loop 2 also has a preformed U-shaped loop linking portion 12 extending diagonally with respect to a longitudinal direction 7 of the spiral, between a lower end of the front leg 8 of the loop portion 4 and a lower end of a rear leg 10 of . a loop portion 4 of a next one of the loops 2.
  • the loop portions 4 are parallel with and spaced from one another by a definite pitch distance 14 in the longitudinal direction 7 of the spiral, adapted to match with the fabric loops at the ends of the endless belt segments and to define openings 17 for interdigitation with a like spiral to form a channel 19 for the pintle, as best shown in Figure 4, without longitudinal deformation (stretching or contracting) of the spirals during the interdigitation.
  • the interdigitation and assembly with the endless belt segments are quite simple and easy, and the original dimensional and formal features of the spirals are preserved without any spatial or structural losses.
  • the inner channel 19 is thus fairly if not fully smooth and even, which facilitates the insertion of the pintle. Due to its symmetry, there is no longer any need for a left and right spiral model.
  • the series of loops 2 can be made of a monofilament (single wire) of polyester (trademark) , nylon (trademark) , PEEK (PolyEther Ether Ketone) , PVDS (Fluoropolymer) , Ryton (trademark), or any other suitable material.
  • a thread can also be used instead of a monofilament if desired.
  • a polyester that resists to hydrolysis should preferably be used.
  • an atoxic material should be used.
  • the monofilament may have a flat cross-section, providing more inner space for the channel 19.
  • spirals according to the invention can be seamed or otherwise attached to the ends of the belt segments to be interconnected with yarns woven in the belt segments and curling back around the linking portions 12, forming the aforesaid terminal fabric loops.
  • the loop and linking portions 4, 12 have a uniform cross-section as illustrated in Figures 1A- B and 3.
  • each loop portion 4 may have projections 22 made out of the spiral on opposite sides of the loop portion 4 in the longitudinal direction 7 of the spiral, for interlocking with like projections 22 on the like spiral as exemplified in Figure 4.
  • the projections 22 can be made by a flattening of the head 18 between the legs 8, 10 of each loop portion 4, provided that the monofilament has a cross-section (e.g. a round cross-section) suitable for the flattening operation which involves no injection of additional material.
  • the heads 18 have a flared profile with bent surfaces 24 between the heads and the legs 8, 10 as a result of the flattening operation.
  • the heads 18 preferably have an oval shape when viewed from above.
  • Such an interlocking feature is particularly useful to hold back the spirals together the time to install the pintle inside the channel 19.
  • This feature along with the design of the spirals also prevent cross disengagement of the loops of the spirals if they are subjected to a contracting force.
  • a loss in the strength of the resulting interconnection is likely to happen due to the flattening of the wire to form the heads 18 when made in this way.
  • each loop portion 4 may be longer than a width 16 of the loop portion 4 in the transverse direction 6 of the spiral, so that the channel 19 has an obround cross-section adapted to receive a flat pintle.
  • the heads 18 and the loop linking portions 12 preferably have substantially flat inner faces 26 so that the channel 19 has a cross-section more rectangular than oblong. Such a feature may especially be difficult to achieve for smaller sizes of spirals due to the bending of the material, yet more channel space is nevertheless obtained compared to conventional spirals.
  • typical sizes (or models) of spirals made according to the invention are 5.2 mm (height) x 2.6 mm (transverse width of a loop 2), 3.7 mm x 2.2 mm, and .38 mm x .63 mm. Larger or smaller sizes can also be considered, provided that the loop per spiral rate is adjusted accordingly.
  • the gauge of the wire used to make the spiral can be chosen according to the needs (desired strength, available space for the spiral, etc.).
  • the design of the spirals according to the invention allows two interdigitated spirals to reach the bottom of the other. With the larger channel 19 obtained with the spirals according to the invention, a larger (stronger) pintle can be used, or a remaining gap in the channel 19 after pintle insertion can be filled with a suitable material.
  • Typical pitch distances 14 with the spiral according to the present invention range from one time to at least twice a diameter of the material used to form the spiral.
  • the very requirements specified by the client can be met.
  • the following parameters can be specified for the manufacture of the spirals according to the present invention: the type of spiral (regular or with teeth); the material; the diameter of the monofilament; the dimensions of the monofilament; the spiral dimensions (width x thickness) ; the number of pitch of the spiral / 100 mm (or another predetermined spiral length) .
  • the spirals according to the present invention fully match with the endless belt segments and their terminal loops, instead of deforming the spirals to match the terminal loops of the endless belt segments or stretching the terminal loops to match the spirals as in the conventional practice, with all the problems related to such practice.
  • the pitch of the spirals according to the present invention can be chosen so that more than one yet a definite number of terminal loops hook around each loop linking portion 12 of the spirals.
  • the spiral can advantageously be produced using a monofilament made of thermoformable material.
  • the monofilament is first wound around a rod (not shown in the Figures) having a cross-section reflecting a desired inner shape of the spiral (i.e. to form the channel 19).
  • the wound monofilament is press-shaped against the rod so that it forms a series of loops 2 having the above described features.
  • the press-shaped monofilament is then subjected to a heating and cooling fixating cycle.

Abstract

Cette invention a trait à une spirale permettant de raccorder les extrémités des segments d'une courroie sans fin au moyen d'une cheville. Cette spirale est constituée d'une série de boucles (2) se composant d'éléments de boucle en forme de U inversé (4) se déployant dans le sens travers (6) de la spirale. Ces éléments de boucle (4) comportent des bras (8, 10), écartés les uns des autres, afin de laisser place à la cheville, les chapeaux de ces éléments, qui sont recourbés, partant des bras (8, 10) et s'étendant entre ceux-ci. Des éléments de liaison de boucle en forme de U (12) se déploient en diagonale par rapport à la direction longitudinale (7) des spirales, entre les parties inférieures des bras (8, 10) des boucles successives. Les éléments de boucle (4), qui sont parallèles les uns des autres, sont séparés par une distance prédéfinie (14) correspondant aux boucles textiles et prévue pour laisser place à des ouvertures (17) par lesquelles les éléments de spirale s'interdigitent afin de former un canal pour la cheville, sans qu'il ne survienne de déformation dans le sens longitudinal lors de l'interdigitation.
PCT/CA2001/001784 2001-12-10 2001-12-10 Spirale permettant de raccorder les extremites des segments d'une courroie sans fin WO2003054416A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/CA2001/001784 WO2003054416A1 (fr) 2001-12-10 2001-12-10 Spirale permettant de raccorder les extremites des segments d'une courroie sans fin
EP01275043A EP1463897A1 (fr) 2001-12-10 2001-12-10 Spirale permettant de raccorder les extremites des segments d'une courroie sans fin
AU2002215762A AU2002215762A1 (en) 2001-12-10 2001-12-10 Spiral for interconnecting ends of endless belt segments

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA2001/001784 WO2003054416A1 (fr) 2001-12-10 2001-12-10 Spirale permettant de raccorder les extremites des segments d'une courroie sans fin

Publications (1)

Publication Number Publication Date
WO2003054416A1 true WO2003054416A1 (fr) 2003-07-03

Family

ID=4143182

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2001/001784 WO2003054416A1 (fr) 2001-12-10 2001-12-10 Spirale permettant de raccorder les extremites des segments d'une courroie sans fin

Country Status (3)

Country Link
EP (1) EP1463897A1 (fr)
AU (1) AU2002215762A1 (fr)
WO (1) WO2003054416A1 (fr)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2059021A1 (de) 1970-12-01 1972-06-08 Opti Holding Ag Vorrichtung zur Verbindung von Foerdergurten od.dgl.
US4539730A (en) 1983-08-22 1985-09-10 Albany International Corp. Seaming means and a tool for forming the seam
EP0275656A1 (fr) 1986-12-13 1988-07-27 Scapa-Porritt Limited Liaison sans fin d'une bande
US4791708A (en) 1984-02-23 1988-12-20 Asten Group, Inc. Abrasion and hydrolysis resistant joining means for fabric seams
EP0364066A1 (fr) * 1988-10-14 1990-04-18 Asten Group Inc. Jonction des extrémités du tissu d'une machine à papier
EP0674041A2 (fr) 1994-03-16 1995-09-27 Asten, Inc. Jonction à enroulement hélicoidal pour un tissu industriel à couche unique ayant un rapport d'armure impair
US5915422A (en) 1995-03-23 1999-06-29 Albany Nordiskafilt Ab Machine clothing having a seam, and spiral for use in such a seam
EP0967306A1 (fr) * 1998-06-26 1999-12-29 Johns Manville International, Inc. Monofilament à base de polyéthylène-2.6-naphthalate
WO2001096761A1 (fr) * 2000-06-16 2001-12-20 Lippert Pintlepin Mfg. Inc. Spirale permettant d'interconnecter les extremites des segments d'une courroie sans fin

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2059021A1 (de) 1970-12-01 1972-06-08 Opti Holding Ag Vorrichtung zur Verbindung von Foerdergurten od.dgl.
US4539730A (en) 1983-08-22 1985-09-10 Albany International Corp. Seaming means and a tool for forming the seam
US4791708A (en) 1984-02-23 1988-12-20 Asten Group, Inc. Abrasion and hydrolysis resistant joining means for fabric seams
US4791708B1 (en) 1984-02-23 1995-02-07 Asten Group Abrasion and hydrolysis resistant joining means for fabric seams
US4791708B2 (en) 1984-02-23 1995-11-28 Asten Group Abrasion and hydrolysis resistant joining means for fabric seams
EP0275656A1 (fr) 1986-12-13 1988-07-27 Scapa-Porritt Limited Liaison sans fin d'une bande
EP0364066A1 (fr) * 1988-10-14 1990-04-18 Asten Group Inc. Jonction des extrémités du tissu d'une machine à papier
EP0674041A2 (fr) 1994-03-16 1995-09-27 Asten, Inc. Jonction à enroulement hélicoidal pour un tissu industriel à couche unique ayant un rapport d'armure impair
US5915422A (en) 1995-03-23 1999-06-29 Albany Nordiskafilt Ab Machine clothing having a seam, and spiral for use in such a seam
EP0967306A1 (fr) * 1998-06-26 1999-12-29 Johns Manville International, Inc. Monofilament à base de polyéthylène-2.6-naphthalate
WO2001096761A1 (fr) * 2000-06-16 2001-12-20 Lippert Pintlepin Mfg. Inc. Spirale permettant d'interconnecter les extremites des segments d'une courroie sans fin

Also Published As

Publication number Publication date
EP1463897A1 (fr) 2004-10-06
AU2002215762A1 (en) 2003-07-09

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