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EP0020385A1 - Bande de roulement amovible et sa methode de rechappage - Google Patents

Bande de roulement amovible et sa methode de rechappage

Info

Publication number
EP0020385A1
EP0020385A1 EP79901035A EP79901035A EP0020385A1 EP 0020385 A1 EP0020385 A1 EP 0020385A1 EP 79901035 A EP79901035 A EP 79901035A EP 79901035 A EP79901035 A EP 79901035A EP 0020385 A1 EP0020385 A1 EP 0020385A1
Authority
EP
European Patent Office
Prior art keywords
tread
belt
worn
bonding
recapping
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.)
Withdrawn
Application number
EP79901035A
Other languages
German (de)
English (en)
Inventor
Charles E. Grawey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Caterpillar Inc
Original Assignee
Caterpillar Tractor Co
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 Caterpillar Tractor Co filed Critical Caterpillar Tractor Co
Priority to EP79901035A priority Critical patent/EP0020385A1/fr
Publication of EP0020385A1 publication Critical patent/EP0020385A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D30/00—Producing pneumatic or solid tyres or parts thereof
    • B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
    • B29D30/52—Unvulcanised treads, e.g. on used tyres; Retreading
    • B29D30/54—Retreading

Definitions

  • This invention relates to retreading and more particularly to the recapping of a removable tread belt for a replaceable tread tire.
  • Examples of prior art patents which illustrate conventional tire recapping methods include the Elmer J. Wasko United States Letters Patent 3,802,977, issued April 9, 1974, which teaches the retreading of the tire casing by utilization of a previously vulcanized tread which is cemented on the buffed, worn periphery of the casing. Wasko teaches the use of a specially configured bag to cover the precured tread so as to contain steam in heating and vulcanizing the adhesive to permanently cement the tread to the prepared tire casing.
  • Robert E. Sausaman in United States Letters Patent 3,839,123, issued October 1, 1974, shows a prevulcanized annular tread section which is similarly applied to the buffed or otherwise prepared worn tire carcass or casing. Sausaman teaches the use of internal pressure in forcing the carcass against the annulus which is structurally adapted to tightly engage the worn carcass prior to the application of pressure thereto. A pressurized fluid heating medium is circulated within the casing so that the tread section is cured thereto in the bonding operation.
  • United States Letters Patent 3,868,284 issued February 25, 1975, Bernard E. Hogan, Sr.
  • et al teach an apparatus and method of recapping worn tires with a precured tread arranged so as to maintain the sidewalls of the tire carcass relatively cool during the bonding operation.
  • the heat is applied through the precured tread and a mold is utilized to introduce direct fluid pressure onto the outer surface of the tread to provide both pressure for the bonding operation and to provide a portion of the heat transfer means.
  • a vulcanizable rubber band is provided around the tire carcass and the ring mold is first expanded and then fitted over the thusly applied band. The mold is then allowed to contract and is centered on the body while the tire is being rotated. The entire unit has been heated to a temperature sufficient to fuse the band and permit the ring mold to emboss the tread design onto the band which is concurrently vulcanized and bonded to the tire body.
  • the present invention comprehends an improved recapped removable tread belt manufacture.
  • the invention comprehends the utilization of preformed tread sections in recapping a worn tread belt.
  • the recapped tread belt more specifically includes an annular belt base having an accurately circularly cylindrical machined outer surface, and a plurality of tread sections secured in end-to-end annular relationship to the belt base surface. Adhesive may be provided between the juxtaposed ends of the belt tread sections which may be cured concurrently with the curing of the belt sections to the worn removable tread belt.
  • the machined outer surface.. may be disposed closely outwardly of the reinforcing portion of the belt base, as desired.
  • the invention further comprehends the provision of such a recapped tread belt wherein the tread is applied in the form of a continuous strip tread section secured annularly about the belt base surface.
  • the invention further comprehends the improved method of reconstructing such removable tire belts having worn tread portions including the steps of arranging the worn belt in a cylindrical configuration with the worn tread portion thereof outermost, removing the worn tread portion to expose an outer cylindrical bonding surface, and bonding a replacement tread portion to the bonding surface.
  • a layer of adhesive may be applied to the bonding surface which is set while the replacement tread portion is in contact therewith to effect the desired manufacture.
  • the manufacture may include the step of preforming a plurality of replacement tread portion sections and the bonding step may comprise a step of bonding the sections in end-to-end relationship, as well as to the bonding surface.
  • a pressure force may be applied to the sections to urge the sections forcibly in intimate association with the adhesive coating bonding surface.
  • the tread may be formed in an unmolded strip applied to the bonding surface concurrently with the bonding of the strip to the machined belt surface.
  • the worn tread may be removed as by machining, buffing, trimming, etc., as desired.
  • the worn belt may be mounted on a radially outwardly acting mandrel during the bonding step.
  • the mandrel may be rotated during the bonding step to provide further improved manufacture of the recapped belt.
  • FIGURE 1 is a fragmentary transverse section of a replaceable tread tire
  • FIGURE 1a is a perspective view of a tire illustrating a worn tread belt portion thereof;
  • FIGURE 2 is a fragmentary transverse section of a tire having a worn tread belt
  • FIGURE 2a is a section taken substantially along the line 2a-2a of Figure 2;
  • FIGURE 3 is a fragmentary section illustrating the step of removing the worn portion of the tread belt
  • FIGURE 4 is a fragmentary transverse section illustrating the application of adhesive to the partially prepared tread belt
  • FIGURE 5 is a fragmentary transverse section illustrating the provision of the replacement tread on the adhesively bonded, partially prepared tread belt
  • FIGURE 6 is a fragmentary section illustrating the step of heating the assembly of Figure 5 to effect a bonding of the recapping tread to the tread belt;
  • FIGURE 7a is a fragmentary perspective view of one form of tread for use in the recapping of the tread belt
  • FIGURE 7b is a fragmentary perspective view of another form of tread for such use.
  • FIGURE 7c is a fragmentary perspective view of still another form of tread for such use
  • FIGURE 8 is a perspective view of an annular arrangement of the recapping tread elemens suitable for installation on the partially prepared tread belt;
  • FIGURE 9 is a side elevation of a recapping belt in extended arrangement made up of preformed tread sections disposed in end-to-end relationship;
  • FIGURE 10 is a perspective view of the completed annular tread belt.
  • FIGURE 11 is a fragmentary perspective view illustrating a step in forming the tread in situ on the reworked belt by means of tread-forming elements engaging the annular periphery thereof.
  • a structure for use in recapping a worn tread belt and method of forming the same are shown wherein a removable belt 10 is recapped with a new tread portion 11 so as to permit renewal of tread material in a worn replaceable tread tire, such as tire 12 shown in Figure la.
  • a worn replaceable tread tire such as tire 12 shown in Figure la.
  • One conventional form of tire includes an inner annular carcass portion 13, as seen in Figure 1, having a removable belt 10 mounted on an outer surface 14 thereof.
  • the tread portion 15 of the belt may become worn, such as illustrated in Figure 2.
  • the belt has been removed and replaced with a new belt.
  • the worn belts have been scrapped.
  • the present invention comprehends an improved manufacture wherein the worn removable belt is recapped, thereby providing a substantial economy and improved utilization of natural resources by permitting the reuse of a substantial part of the worn removable belt including the reinforcing portion 16 as a base, as shown in Figure 3.
  • the worn belt 10 may be placed on a suitable mandrel 18 during the reworking operation after having been removed from the tire carcass 13 in the conventional manner well known to those skilled in the art.
  • Mandrel 18 may comprise an annular mandrel supporting the belt circumferentially, as illustrated in
  • the mandrel may be provided with a grooved outer surface 19 for receiving the radially inwardly projecting annular ribs 20 of the replaceable belt for facilitated handling of the removable belt in the recapping operation.
  • the worn belt 10 may have the outer worn portion 21 thereof removed by machining or similar operation to define an accurate annular outer surface 21' for receiving the new tread portion 11.
  • the worn tread portion 21 is removed by a grinding operation, such as by application of grind wheel 22 to the outer surface portion.
  • a layer of adhesive 23 is applied to the machined outer surface 21' of the removable belt, and as shown in Figure 5, the new tread portions 11 may be secured to the surface 21' by the adhesive 23.
  • the adhesive may comprise a rubber adhesive.
  • the completion of the bonding of the new tread portion to the reworked worn tread belt may be effected by heating the assembly on the mandrel 18 in a suitable apparatus, such as oven 24, defining a heating chamber 25 which may be heated by any suitable means, such as electric heating coil 26.
  • Chamber 25 may, if desired, be placed under a positive pressure so as to firmly urge the new tread portions against the adhesive 23 and, thus, assure a positive bond to the reworked belt surface 21'.
  • FIGs 7a, 7b and 7c different tread configurations may be utilized as desired in the recapping of the belt.
  • a first tread configuration 27 may be utilized, as shown in Figure 7b, a different tread configuration 28 may be utilized, and as shown in Figure 7c, a still different tread configuration 29 may be utilized, it being understood that the tread configurations illustrated are exemplary only and that the invention comprehends the utilization of any desired tread configuration in recapping the belt.
  • the tread portion may be formed of a plurality of segmental sections, such as sections 30.
  • the invention comprehends the selective bonding of the tread sections" to the prepared worn belt portion by either placing the individual sections on the adhesive coated surface
  • the individual sections may be laid out in a series, having the confronting ends 31 and 32 secured as by suitable adhesive.
  • the complete replacement tread length may be laid out in a rectilinear series which, as shown in Figure 8, may then be brought to an annular configuration with the opposite ends 33 and 34 of the series being joined adhesively to complete the annular arrangement 35.
  • annular retreaded belt 36 is illustrated in Figure 10 showing the secured assembly of the new tread portion 11 to the removable belt 10.
  • the reworked belt 36 may now be utilized as a replacement for the original worn belt of the tire 12 by the mounting thereof to the original tire carcass 13 in the conventional manner.
  • a modified method of providing the new tread on the belt is shown to include the step of providing the tread configuration in an annular body 37 mounted about the machined, reworked belt portion.
  • Annular body 37 may comprise an uncured rubber tread portion which may have the tread configuration molded therein concurrently with the bonding of the material to the machined belt portion by means of molding platens 38 and 39 movable against the moldable body 37 in diametrically opposed directions, as shown in Figure 11.
  • the formation of the desired tread configuration and the securing of the new tread to the reworked worn belt portion may be concurrently effected for further facilitated economy and simplicity in manufacture.
  • the tread body 37 may be comprised of conventional unvulcanized rubber or any other suitable tread material, as desired.
  • the interior of the machined worn belt portion may be supported on a suitable mandrel 40 during the tread forming and bonding operation.
  • the invention comprehends the removal of the worn tread of a removable tire belt by suitable means, such as buffing or machining, and the replacement of the worn tread portion with a new tread portion.
  • the replacement may be effected selectively by providing a plurality of individual tread sections about the circumference of the reworked belt outer surface, by the placement of an annular molded tread element thereabout, or by forming the tread on a tread body placed about the reworked belt portion by concurrently forming the tread configuration and bonding the tread means to the reworked belt portion.
  • the bonding and forming operations may be performed in a suitable autoclave or by suitable heating and pressure-applying means as are conventionally utilized in the tire-forming art.
  • the invention may be utilized in conjunction with all forms of vehicle tires and the like utilizing removable belts. By minimizing the amount of new material necessary to effect the recapping of the worn tread belt, a substantial economy and energy saving is obtained.
  • the invention has been found to be highly efficacious in connection with the recapping of removable tread belts for earthworking vehicle tires which are of relatively large size and wherein the retreading thereof by replacement of the removable belts is very expensive.
  • the use of the present invention realizes a substantial economy in particular in connection with tread belts for such large size vehicle tires.
  • Other aspects, objects and advantages of this invention can be obtained from a study of the drawings, the disclosure and the appended claims.
  • the foregoing disclosure of specific embodiments is illustrative of the broad inventive concepts comprehended by the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tyre Moulding (AREA)
  • Tires In General (AREA)

Abstract

Dans une structure et une methode de rechappage d'une bande de roulement amovible (10) de pneus de vehicule (12), une nouvelle partie d'une bande de roulement (11) est appliquee sur la surface externe usinee (21') d'une bande de roulement usee (10). La nouvelle partie de la bande de roulement (11) peut-etre appliquee a la surface de la bande usinee au moyen d'une couche adhesive (23) et en appliquant ulterieurement une pression et/ou de la chaleur comme dans un four (24). La bande de roulement appliquee peut se presenter sous forme de sections separees (30) disposees en series annulaires en bout a bout (35) soit directement sur la surface revetue du produit adhesif usinee soit comme une configuration annulaire preformee. En variante, la bande de roulement de remplacement peut etre appliquee sur la surface revetue de l'adhe comme un corps annulaire (37). Le moulage de la configuration de la bande de roulement dans le corps (37) peut etre effectue en utilisant des platines de moulage (38, 39) qui peuvent etre chauffees de maniere appropriee pour effectuer le moulage de la bande de roulement desiree et la liaison du corps (37) sur la bande usee usinee (10). La partie de renforcement (16) de la bande usee (10) est reutilisee dans la bande retravaillee terminee.
EP79901035A 1978-12-21 1980-07-01 Bande de roulement amovible et sa methode de rechappage Withdrawn EP0020385A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP79901035A EP0020385A1 (fr) 1978-12-21 1980-07-01 Bande de roulement amovible et sa methode de rechappage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US1978/000252 WO1980001262A1 (fr) 1978-12-21 1978-12-21 Bande de roulement amovible et sa methode de rechappage
EP79901035A EP0020385A1 (fr) 1978-12-21 1980-07-01 Bande de roulement amovible et sa methode de rechappage

Publications (1)

Publication Number Publication Date
EP0020385A1 true EP0020385A1 (fr) 1981-01-07

Family

ID=22141319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79901035A Withdrawn EP0020385A1 (fr) 1978-12-21 1980-07-01 Bande de roulement amovible et sa methode de rechappage

Country Status (3)

Country Link
EP (1) EP0020385A1 (fr)
IT (1) IT1124996B (fr)
WO (1) WO1980001262A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106255587B (zh) * 2014-05-01 2019-04-12 米其林集团总公司 轮胎胎面生产方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802977A (en) * 1971-11-12 1974-04-09 Goodyear Tire & Rubber Method of retreading tires
US3839123A (en) * 1972-09-01 1974-10-01 Gen Tire & Rubber Co Elastomeric heat and pressure annulus
US3868284A (en) * 1973-10-09 1975-02-25 Sr Bernard E Hogan Tire retreading apparatus and method
US4053265A (en) * 1973-11-12 1977-10-11 Dacapo Ab Mold for retreading pneumatic tires
US3919020A (en) * 1974-07-19 1975-11-11 Goodyear Tire & Rubber Method of retreading a tire
US4092196A (en) * 1976-03-22 1978-05-30 The Goodyear Tire & Rubber Company Retreading and rebuilding of radial tires

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8001262A1 *

Also Published As

Publication number Publication date
IT1124996B (it) 1986-05-14
WO1980001262A1 (fr) 1980-06-26
IT7927362A0 (it) 1979-11-16

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Inventor name: GRAWEY, CHARLES E.