FR2534191A1 - TIRE FULL RUBBER OR ANALOGUE MATERIAL WITH REMOVABLE ROLLER BELT - Google Patents

Abstract

THE INVENTION RELATES TO A SOLID TIRE MADE OF RUBBER OR SIMILAR MATERIAL WITH A REMOVABLE TREAD. IT INCLUDES AN ELASTIC BANDAGE 1 IN THE FORM OF TWO COAXIAL ANNULAR PARTS 2 AND 3 OF DIFFERENT HARDNESSES AND MODULES OF ELASTICITY AND PRESENTING AN ELASTIC ELASTIC COEFFICIENT BETWEEN 1.03 AND 1.08, A HEEL 3 PRESENTING A MODULE OF ' ELASTICITY LOCATED BETWEEN 7 NMM (70 SH) AND 15 NMM (95 SH), THE BODY OF BANDAGE 2 SHOWING A MODULE OF ELASTICITY INCLUDED BETWEEN 3 NMM (40 SH) AND 10 NMM (80 SH), TREAD 5 BEING CONSTITUTED BY AN INEXTENSIBLE RING IN THE RADIAL AND CIRCUMFERENTIAL DIRECTION AND PRESENTING AN INTERNAL DIAMETER SLIGHTLY GREATER THAN THE EXTERNAL DIAMETER OF BANDAGE 1 BEFORE ITS FITTING ON A RIM OR WHEEL AND SLIGHTLY LOWER THAN THE OUTER DIAMETER OF THE BANDAGE, ON A BANDAGE OR WHEEL.

Description

1. "Tire full of rubber or strip-like material

removable bearing ".

  The present invention relates to a tire solid rubber or the like, with removable tread> intended to be used in particular

  on wheels of industrial trucks or other vehicles

similar industrial processes.

  Vehicles of this type are generally

  equipped with solid tires rather than inflatable tires.

  vehicles because of the insensitivity of these solid tires to cuts and perforations and, secondly,

  weak subsidence under even large loads.

Such solid tires are however

  expensive because they include more

  In addition, the rigidity of such solid tires has the consequence that they are practically integral with their rim, so that the assembly and disassembly of such tires must

  usually be done in a workshop.

  To reduce as much as possible the cost of such full tires, it has been envisaged to

  on the market for solid tires with an inadequate tread

  vible. 2. So when this tread

  used, simply replace it with a new one.

of rolling.

  However, these solid tires with removable tread are subject to relatively harsh requirements for securing and maintaining

  this tread on the elastic bandage body

than tire.

  In solid tires of this type known up to now> the risk exists that after a certain time of use the tread is detached from the body of the tire In addition, a certain clearance can be formed between the rim or the wheel and the bead of the tire when it is subjected to a relatively large load, which causes a slip between the tire and the rim

or wheel.

  Some known tires with removable tread have an inner groove hollow in

  the purpose of giving the tire some flexibility.

  However, the attachment to a rim of a tire to soul

  the tire does not allow the tire to

  important risks and presents the risk of

  and moving the tread.

  Other known tires include a removable tread that is fixed or vulcanized on a metal strapping, which is in turn attached to the

  body of the tire by hooping on another metal circle

  that surrounding the tire body The manufacture of such

tires is storytelling and delicate.

3. 2534191

  3. In still other tires, the removable tread is held on the tire body

  by air pressure in a central annular chamber.

  This way of proceeding is also quite complicated and relatively unreliable. The present invention is essentially for

  aim to remedy the aforementioned drawbacks and to pre-

  a solid tire with a removable tread of simple construction which forms, however, practically body with the bandage while being easily

replaced after wear.

  For this purpose, according to the invention, the tire comprises a substantially elastic tire formed of two coaxial annular parts of different hardness and modulus of elasticity and having an elastic elongation coefficient of between 1.03 and 1.08, a

  inner part constituting the heel for

  with a rim or a wheel and having a modulus of elasticity between 7 N / mm 2 (+ 70 Sh) and 15 N / mm 2 (+ 95 Sh), a second part constituting the body of the

  bandage having a modulus of elasticity less than

  heel and included between 3 N / mm 2 (+ 40 Sh) and 10 N / mm 2 (+ 80 Sh), the tread being constituted by a ring substantially not extendable in the radial direction and

  circumferential and having a slight inner diameter

  higher than the outside diameter of the tire before it is placed on a rim or wheel and slightly lower than

  outside diameter of the set bandage, without the roll band

on a rim or a wheel.

  Advantageously, the tread is arranged by an annular reinforcement extending at 4.

  proximity of the inner surface of this band, intended

born to fit on the bandage.

  The invention also relates to a

  assigned mounting and assembly of the aforesaid tire.

  This method of assembly is characterized by the fact that the tread is first slid over the elastic bandage and the elastic bandage is then forced with the tread on the rim or the wheel by the tread. intermediate of a conical surface guiding device, adapting laterally against the rim or the wheel, and a laterally acting press

  on the heel of the bandage engaged on the guiding device.

  dage. Other details and particularities of

  the invention will emerge from the description given above.

  after, by way of non-limiting example, of several

  particular embodiments of the object of the in-

  with reference to the annexed drawings.

  FIG. 1 is a cross-section and radial section of a part of a tire before mounting on a

wheel or rim.

  Figure 2 shows this tire mounted on

a rim.

  Figure 3 is a circumferential cross-section

  part of a variant of a tire according to the invention. Figure 4 shows schematically

  the assembly and assembly of a tire on a rim.

  In the different figures the same

  references refer to identical or similar elements.

  The tire shown in FIGS.

  takes a substantially elastic bandage formed of two 5.

  coaxial annular portions 2 and 3 of hardness and

  dules of different elasticity and having a coeffi-

  elastic elongation of between 1.03 and 1.08.

  By coefficient of elastic elongation it is necessary

  to hear, in this description, the report

  between the maximum diameter of the tire as a result of

  elastic formation and the diameter of the front tire deforms

  mation. The inner portion 3 constitutes the heel intended to cooperate with a rim or wheel 4 and advantageously has a modulus of elasticity greater than that of the second portion 2 constituting the body of the bandage.

  In particular, the elasticity module

  The taper of the heel 3 is between 7 N / mm 2 (+ 700 Sh) and N / mm 2 (+ 950 Sh), while that of the tire body 2 has a modulus of elasticity of between 3 N / mm 2

  (+ 40 Sh) and 10 N / mm 2 (+ 800 Sh).

  This tire comprises, in addition, a band

  removable bearing 5 formed by a sensitive ring

  This tire tread has an inside diameter slightly greater than the outer diameter of the tread, which is inextensible in the radial and circumferential direction of the tire.

  bandage before laying on the rim or wheel 4 and light-

  less than the outside diameter of the bandage 1 placed, without a band of bearings on this rim or wheel. This difference in relative diameter depends on the nature

  of the material of which the bandage and

  of rolling as well as the shape and dimensions

constituent parts of the tire.

  In the embodiment according to the figures, the tread is reinforced by a

253419 1

  6. annular armature 6 extending near the inner surface 7 of this band adapted to fit on the

bandage 1.

  This frame is formed by metal cables extending substantially in the direction

  circumferential band & ede bearing.

  Conveniently, this armature is formed by a ribbon in which several cables extend side by side in the longitudinal direction of the ribbon, the ribbon extending helically around the central axis of the ribbon 5 This is therefore a practical way for laying cables

in the tread.

  The body of the tire 1 is made of vulcanizable or thermoplastic rubber with a shore hardness between 40 and 800 and advantageously a

hardness of the order of 600 shore.

  The heel of the bandage body, on the other hand,

  is harder to resist rubbing and rubbing

  frying caused by the rim or wheel 4.

  To obtain this heel hardness,

  solutions may be envisaged according to the invention

  Using a vulcanizable mixture of hard rubber 70 to 95 shore 2 use a rubber loaded with relatively short textile or other fibers, in particular of the order of 5 to mm. forming the heel of a composite material of layers of fabric alternating with layers of hardness rubber

from 55 to 750 shore.

  The outer surface 8 of the tire 1 and the inner surface 7 of the tread 5 7 intended to be applied on this outer surface 8 are substantially cylindrical. This is a manufacturing advantage and makes it possible, above all, to predict a difference.

  minimum between the inside diameter of the road band

  5 and the outside diameter of the tire is not dilated It suffices that the clearance between the tread and

  the bandage is just enough to allow the gliding

from one to the other.

  In this way, the expansion of the elastic bandage 1 obtained by mounting on the rim or wheel 4 can be reduced to a minimum to obtain the

  blockage of the tread 5 on this tire.

  However, in some cases, he may

  be useful to increase the contact between the bank body

  tread 1 and the tread 5 For this purpose, it is

  advantageously sees on the respective contact surfaces 7 and 8 grooves and complementary ribs orienées

  preferably transversely along the axis of the tire.

  Possibly, it could be

  very interlocking means to increase the adhesion between

these two surfaces.

  Another important feature of the tire according to the invention is that the tire body 1 has a transverse narrowing at a location between the heel 3 and its contact surface 8 with the tire.

5.

  As shown in Figures 1 and 2, this

  is advantageously obtained by providing

  concave sidewalls 2a and 2b to the body of the bandage 2.

  Furthermore, depending on the nature and the constitution of the material of which are formed the heel 3 and the body 2 of the bandage 1, advantageously, the zone 10 of the 8. heel 3 intended to protrude from the groove of housing he provided on the periphery of the wheel or rim 4 is

  wider than the area of the bandage near its sur-

  contact face 8 with the tread 5.

  These particular forms make it possible to influence the relative elasticity of the different parts

  This relative elasticity is in fact

  a very important factor for mounting and fixing

  tread 5 on the tire 1 and for

  the adherence of the heel 3 to the rim, especially when

relatively important.

  It is indeed as it is indis-

  It is conceivable that the modulus of elasticity and the hardness of the heel are greater than modulus of elasticity and hardness.

of the body of the bandage 2.

  As already mentioned above, the invention

  In addition, it relates to a method of assembling and assembling

  the tire as described above which

  it is essential to me that, thanks to the simplicity of

  given, these assembly, assembly and disassembly of the tire can be performed by unskilled labor

  and without requiring expensive or complicated equipment.

  For this purpose, as is clear from

  of Figure 4, first slide the web

  5 to the elastic bandage 1 and then force the elastic bandage 1, provided with the tread 2,

  on the rim or wheel 4 by means of a device

  tif guide 12 with conical surface adapting side-

  against the rim or wheel and a press, not shown

  felt in the figures, acting laterally on the heel 3

  the opposite side to the one engaged on the guiding device.

age 12.

9.

  Here is an example of a

  practical use of a tire according to the invention which allows

  to further illustrate the essential characteristics of

the ones of this one.

  -This is a 700 x 12 tire consisting of a replaceable tread 5 made of a 69 Shore abrasion resistant rubber, a tire body 2 comprising an elastic rubber layer having a hardness 58 shore and a heel 3 with 62 shore rubber layers, having

  a thickness of 2 mm, altexnant with layers of fabric 13.

  Tread 5 comprises, at

  proximity of its contact surface 7, a layer of

  6 7 x 4 x 0.175 Adhered Brass Wires

  rubber having a resistance of 1800 N / cable, the number of cables per cm of width being

five -

  The fabric layers 13 have a resistance towards the warp and weft

800 N / cm.

  The dimensions of the tread, the tire and the corresponding rim have been indicated by references in FIG. 4 and have been included in the following table: Tread (mm) tread (mm) rim 500-12 (mm) )

D 1 = 577.3 D 2 = 286.3 D 4 = 301.3

L 1 = 141 D 3 = 574.3 L 3 = 127

E 1 = 48 L 2 = 133

E 2 = '3 E 3 = 65

2 _ 3

  10. Bandage 1 must therefore represent a coefficient of elastic elongation of at least 1.05

(D 4 / D 2 -301.3 / 286.3 = 1.05).

  When mounting the tire on the rim 4, the following observations can be made: the inside diameter D 2 of tire 1 increases from 286.3 mm to 301.3 mm, from 15 mm, the outside diameter D 3 bandage 1 increases

  574.3 mm at 589.3 mm also at 15 mm (without

of rolling).

  if we admit that the radial extension of the band of

  turnover is negligible when it has been

  mounted on the body of the tire 2 before mounting the tire on the rim, the increase in the length of the diameter D 3 is blocked to the length of the diameter DB, c to d at 577.3 mm instead of 589.3 mm without tread, the specific pressure thus obtained by this blocking,

  to the contact surfaces 7 and 8 between the rolling strip

  and the elastic bandage is 0.25 M Pa.

  It has, moreover, been found, after the

  of the tread, that the outer diameter D 3 of the tire increases up to 575 mm after having disassembled

  the tire from the rim-and removed the worn tread.

  This leads to the conclusion that the replacement

  this tread can be achieved without any problem and that the new tread will be

  still applied with sufficient pressure on the banda-

  11. The rim 4 may be of the type of

  represented in Figure 2 which consists of two

  4 a and 4 b assembled according to the median plane by 4 c bolts, to form a rim having a groove 11 with flat bottom or slightly conical prolonged on each side

by raised edges.

  This rim can also be of the type

  shown in Figure 4 and include a removable ledge

  14 retained in a groove 15 by a locking circle

16.

  This flange 14 and this locking circle

  lage 16 have been represented in dashed lines being

  given that these elements are only placed on the rim

  near the mounting of the tire on it.

  In the same way as the heel 3, the body 2 of the tire 1 can be made of either homogeneous rubber or be reinforced by flexible elements,

  not shown in the figures; which can be incorporated

  provided that these elements do not prevent the former

  radial and circumferential tension of the bandage until

  desired rate to obtain blocking of the tape

  detachable on the contact surface thereof% The tread 5 is constituted

  by a ring of rubber or polyurethane p e.

  having good wear resistance which is rendered inextensible in the radial and circumferential direction by

  an annular frame 6, as already mentioned above.

  This armature is flexible and is preferably constituted by a ply of wire rope extending in a circumferential direction, as already mentioned above also: this cable ply can be incorporated into a rubber tube 9,

12 -

  However, in some cases, it may

  It would be useful to use a sheet of textile cables

  or several -nappings of textile or metal

  overlapping cables arranged in such a way that the superposed cables are crossed symmetrically with respect to the

  median plane by forming a relative angle with the latter

small.

  In addition, instead of cables, other reinforcing means could be used which fulfill the same role as these, such as a rubber layer.

  with a very high modulus of elasticity or loaded with fibers or

  core a flexible or perforated sheet metal ring etc. Another variant that could be considered for securing the tread on the body of the tire is to provide, either on

  band, or on the body of the bandage, a circumferential rim

  preferential and relatively lateral

  facilitate the assembly and disassembly of the

  is lying. It is understood that the invention is not limited to the various embodiments described and that many variants could still be

  envisaged without departing from the scope of this patent.

13.

Claims (13)

REVENDI CATI ONS   1 Tire made of rubber or rubber material   removable tread log characterized in that it comprises a substantially elastic tire (1) formed of two coaxial annular portions (2 and 3) of   different hardnesses and moduli of elasticity and   an elastic elongation coefficient of between 1.03 and 1.08, an inner part constituting the heel (3) designed to cooperate with a rim or a wheel and having a modulus of elasticity of between 7 N / mm 2 ( <700 Sh) and 15 N / mm 2 (950 Sh), a second part constituting the body of the bandage (2) having a modulus of elasticity lower than that of the heel and between 3 N / mm 2 (+ 40 Sh) and 10 / Nmm 2 (+ 80 Sh), the tread (5) being constituted by a ring   substantially inextensible in the radial and cir-   and having a small inside diameter   higher than the outside diameter of the tire (1) before it is applied to a rim or wheel (4) and slightly smaller than the outside diameter of the laid tire, without   tread on a rim or wheel (4).   Tire according to claim 1, characterized   characterized in that the tread (5) is reinforced by an annular reinforcement (6) extending close to its inner surface (7) intended to fit on the bandage (1).   Tire according to claim 2, characterized   in that the armature (6) is formed by cables   extending substantially in the circumferential direction   tread of the tread (5), close to the inner surface of the latter fitting on the bandage (1).   Tire according to claim 3, characterized in that the cables (6) extend helically around the central axis of the belt. rolling.   Tire according to any one of Claims 1 to 4, characterized in that the body of the aforesaid tire (2) is made of rubber with a hardness of shore. between 40 to 800 shore.   Tire according to claim 5, characterized   rised by the fact that the hardness of the body's rubber   bandage (2) is of the order of 600 shore.   Tire according to any one of the claims   1 to 6, characterized in that the bead (3) of the bandage body (2) is made of rubber having a hardness of 700 to 950 shore.   Tire according to any of the claims   1 to 7, characterized in that the rubber contains a load of short fibers, in particular the order of 5 mm to 80 mm.   Tire according to any of the claims   1 to 6, characterized in that the heel (3)   holds a composite material formed of layers of alternating fabric with layers of hardness rubber of 550 to 750 shore.   Tire according to any one of the   cations 1 to 9, characterized in that the outer surface   of the tire (1) and the inner surface of the tread (5) applying to that surface   outer are substantially cylindrical.   Tire according to claim 10, characterized   in that the aforesaid surfaces are ribbed in the transverse direction.   Tire according to any of the claims   1 to 11, characterized in that the tire body (2) has a transverse narrowing at a location between the bead and its contact surface. with the tread.   Tire according to claim 12, characterized   in that the side walls (2a and 2b) of the   bandage body (2) are substantially concave.   Tire according to any of the claims   preceding claims, characterized in that the area of the bead (3) of the tire (1) intended to protrude from the intended housing area on the periphery of the wheel or rim (4) is wider than the area of the tire near its contact surface with the tread. Tire assembly and assembly method   according to any one of claims 1 to 14,   characterized in that the tread (5) is first slid over the elastic tread (1) and the elastic tread (1) with the tread (5) is then forced on the rim or the wheel (4) via a conical surface guiding device (12), laterally fitting against the rim or the wheel, and a press acting laterally on the   heel of the bandage engaged on the guiding device (12).