CA1053143A - Device for removing the wearing surface of a tire - Google Patents
Device for removing the wearing surface of a tireInfo
- Publication number
- CA1053143A CA1053143A CA265,186A CA265186A CA1053143A CA 1053143 A CA1053143 A CA 1053143A CA 265186 A CA265186 A CA 265186A CA 1053143 A CA1053143 A CA 1053143A
- Authority
- CA
- Canada
- Prior art keywords
- cutting
- bits
- disks
- tire
- cutting member
- 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
Links
Landscapes
- Tyre Moulding (AREA)
Abstract
The present invention concerns a device for removing the wearing surface of a tire, comprising a tire fixing member, which rotates the tire if need be, and a rotating cutting member shaped like a disk and on the circumference of which cutting bits have been af-fixed.
Description
~ .3 The pre3ent invention concerns a device for removiny the wearing surface of a ~ire, comprising a tire fixing memberr which rotates the tire if need be, and a rotating cutting member shaped like a disk and on the circumference of which cutting bits have been affixed.
Devices of ~his kind are used for removing the wearing surface of vehicle tires meant to be resurfaced, the new wearing surface being affixed with the aid of a cement in place of the wearing surface that has been removed~ A device of this kind is known in prior art e.g. through the Garman publicizing print No. 2,429,145. In said device, in depressions on the periphery of a disk disk-shaped cutting bits have been affixed with the aid of wedge pieces that can be tightened with the aid of screws.
~his device of prior art is encumbered by the following drawbacks.
It features poor arrangements for disposal of the chips that are removed. ~his is associated with a great elevation of temperature, with consequent risk of blocking as the overheated rubber material tends to become vulcanized to adhere to the depression in front of the cuttîng bit~ Servicing of the device is slow work because of the inconvenient dismounting and replacing of bits, and in addition it is not possible in this device to adjust ~he position of the bits, that is their cutting angle. The cut is completely smooth, although professionals usually believe that the wearing surface will stick better to a rough surface. It has furthermore been suggested that the device should be used in a direction longitudinal to the wearing surace of the tire, whereby grQoveS
paralleliny the periphery of the tire are produced in the surface upon which the new surface ywl~
'~ :: . , :`. ~ ,`
~ ~ 5 ~
will be fixed. These grooves inter~ere with the degassing that has to be carrled ou-t in co~nect.ion with the affixing of the new surface. Gas inclusions entrained under the surfacing usually cause premature loosening of the surface.
The object of the present invention is to afford an improved device of the t~pe mentioned, by the aid of which the wearing surface of a tire can be removed with high speed, with low energy consumption and wi~hout detriment from heating.
Broadl~ speaking, the present invention provides a device for removing the wearing surface of a tire, which comprises a disk-shaped cutting member formed of two disks detachably joined to each other, the disks having means defining a groove around the periphery of the cutting member and including a number of tire surface cuttiny bits disposed in the cutting member groove in spaced reIationship around the member and being held in the cutting member groove. by clamping action when the two disks are joined together; the GUtting bits each being formed of at least a partial ring having sharp cutting edges, the bits being held in the cutting member groove with portions of the cutting edges exposed, the exposed cutting edges being adapted to cut tire wearing surfaces upon engagement with a tire rotated relative to the deuice, the rings including means defining periphexal groo~es thereabout, the device ~urther includîng bit retaining strips fastened to. the cutting member and passing around the bits in the bit grooves for additionally retaining the ~its in the cutting member periphery gxoove.
The cutting edges of t~e ring-shaped cutt.ing bits perfor~
a slicing cut, whereby the wearing surface is cut away in rather ~ - 2 ~
, ... ..
: . . .
- - . . ...
. . .~.. : - . : .
~5~
larye pieces, which can depart through the central hole of the ring. The material that is bein~ cut is not subjected to any powerful abrasion nor deformations resulting ~rom pressure, ~here-by there is no substantial heating. It is ~urther notPd that the air flow has good access through the cutting ring to cool the work.
In a favourable embodiment of ~he invention the cutting member consists of two disks intended to be ~ixed to each other, whereby the cutting bits will be held b~ form fit in the groove on the periphery face of the disks. Hereby, ~hen the bits have become dull, all the bits may be rapidly and with ease exchanged for new ones, or the rings may be rotated, whereby the dulled bit moves into the fixing groove and from the fixing groove a new sharp edge emerges.
The invention is more closely described in the following with reference to the attached drawing, wherein:-Fig. 1 presents part of a disk of the invention and of the tire which is being worked on, in cross section.
Fig. 2 shows the section carrled along the line II-II
in Fig. 1, on an enlarged scale~
Flg. 3 shows the section of the ring-shaped cutting bit, carried along the line III III in Fig. 2, on a further enlarged scale.
.
, :
- 2a ~
A:
- ` , ` ` . ;
.. .. . . . . . . . . . .
~, .
~S.~
Fig. 4 is a sectioned partial ~iew presenting another embodiment of the invention, wherein the cutting angle of the cutting bits has been arranged to be a~justable.
In the case depicted in Fi~. 1, the cutting disk rotates at right angles to the direction of rotaticn of the tire 10. The cutting disk 1 consists of two disks 12 and 13 mounted side by side and affixed to each other ~y screws 1~. ~he peripheral faces of the disks 12 and 13 have been so shaped that bet~een their rims remains a groove 9 having a cross section with the form of a partial circle. In ~his groove ring-shaped cutting bits 2 have been disposed, which have been tightly impacted between the disks 12 and 13 by the aid of screws 14~ For increased security of their fixiny, the cutting ring 2 has on its outer side an encircling groove 3, which is entered by the strips 4 on the disks 12 and 13. In order that all cutting bits ~
might be positively impacted between the disks 12 and 13 in spite of their dimensional differences due to manufacturing tolerances, slits 5 have been provided on the circumference of the disks 12 and 13 to separate sector parts, each of which contain5 two cutting bits 2 and one fixing screw 14.
Both edges of the cutting ring 2 serve as cutting bits 6, whereby the disk 1 may be rotated in either direction. The disk 1 may be provided in a manner known in prior art with a reversing mèchanism, the reversing of direction taking place over the centre of the tire and the cutting always being towards the outer edge of the tire. To this purpose the disk 1 has been fitted with a mechanism not depicted, to be displaceable in the transverse direction of the tire. In view of producing a roughened surface ` ywl/~ ~ _ 3 ~r~5;~3 after c~ltting, the ring 2 has on its outer ~urface, grooves 7 paralleling its axi~. The cutting grooves produced by the rings
Devices of ~his kind are used for removing the wearing surface of vehicle tires meant to be resurfaced, the new wearing surface being affixed with the aid of a cement in place of the wearing surface that has been removed~ A device of this kind is known in prior art e.g. through the Garman publicizing print No. 2,429,145. In said device, in depressions on the periphery of a disk disk-shaped cutting bits have been affixed with the aid of wedge pieces that can be tightened with the aid of screws.
~his device of prior art is encumbered by the following drawbacks.
It features poor arrangements for disposal of the chips that are removed. ~his is associated with a great elevation of temperature, with consequent risk of blocking as the overheated rubber material tends to become vulcanized to adhere to the depression in front of the cuttîng bit~ Servicing of the device is slow work because of the inconvenient dismounting and replacing of bits, and in addition it is not possible in this device to adjust ~he position of the bits, that is their cutting angle. The cut is completely smooth, although professionals usually believe that the wearing surface will stick better to a rough surface. It has furthermore been suggested that the device should be used in a direction longitudinal to the wearing surace of the tire, whereby grQoveS
paralleliny the periphery of the tire are produced in the surface upon which the new surface ywl~
'~ :: . , :`. ~ ,`
~ ~ 5 ~
will be fixed. These grooves inter~ere with the degassing that has to be carrled ou-t in co~nect.ion with the affixing of the new surface. Gas inclusions entrained under the surfacing usually cause premature loosening of the surface.
The object of the present invention is to afford an improved device of the t~pe mentioned, by the aid of which the wearing surface of a tire can be removed with high speed, with low energy consumption and wi~hout detriment from heating.
Broadl~ speaking, the present invention provides a device for removing the wearing surface of a tire, which comprises a disk-shaped cutting member formed of two disks detachably joined to each other, the disks having means defining a groove around the periphery of the cutting member and including a number of tire surface cuttiny bits disposed in the cutting member groove in spaced reIationship around the member and being held in the cutting member groove. by clamping action when the two disks are joined together; the GUtting bits each being formed of at least a partial ring having sharp cutting edges, the bits being held in the cutting member groove with portions of the cutting edges exposed, the exposed cutting edges being adapted to cut tire wearing surfaces upon engagement with a tire rotated relative to the deuice, the rings including means defining periphexal groo~es thereabout, the device ~urther includîng bit retaining strips fastened to. the cutting member and passing around the bits in the bit grooves for additionally retaining the ~its in the cutting member periphery gxoove.
The cutting edges of t~e ring-shaped cutt.ing bits perfor~
a slicing cut, whereby the wearing surface is cut away in rather ~ - 2 ~
, ... ..
: . . .
- - . . ...
. . .~.. : - . : .
~5~
larye pieces, which can depart through the central hole of the ring. The material that is bein~ cut is not subjected to any powerful abrasion nor deformations resulting ~rom pressure, ~here-by there is no substantial heating. It is ~urther notPd that the air flow has good access through the cutting ring to cool the work.
In a favourable embodiment of ~he invention the cutting member consists of two disks intended to be ~ixed to each other, whereby the cutting bits will be held b~ form fit in the groove on the periphery face of the disks. Hereby, ~hen the bits have become dull, all the bits may be rapidly and with ease exchanged for new ones, or the rings may be rotated, whereby the dulled bit moves into the fixing groove and from the fixing groove a new sharp edge emerges.
The invention is more closely described in the following with reference to the attached drawing, wherein:-Fig. 1 presents part of a disk of the invention and of the tire which is being worked on, in cross section.
Fig. 2 shows the section carrled along the line II-II
in Fig. 1, on an enlarged scale~
Flg. 3 shows the section of the ring-shaped cutting bit, carried along the line III III in Fig. 2, on a further enlarged scale.
.
, :
- 2a ~
A:
- ` , ` ` . ;
.. .. . . . . . . . . . .
~, .
~S.~
Fig. 4 is a sectioned partial ~iew presenting another embodiment of the invention, wherein the cutting angle of the cutting bits has been arranged to be a~justable.
In the case depicted in Fi~. 1, the cutting disk rotates at right angles to the direction of rotaticn of the tire 10. The cutting disk 1 consists of two disks 12 and 13 mounted side by side and affixed to each other ~y screws 1~. ~he peripheral faces of the disks 12 and 13 have been so shaped that bet~een their rims remains a groove 9 having a cross section with the form of a partial circle. In ~his groove ring-shaped cutting bits 2 have been disposed, which have been tightly impacted between the disks 12 and 13 by the aid of screws 14~ For increased security of their fixiny, the cutting ring 2 has on its outer side an encircling groove 3, which is entered by the strips 4 on the disks 12 and 13. In order that all cutting bits ~
might be positively impacted between the disks 12 and 13 in spite of their dimensional differences due to manufacturing tolerances, slits 5 have been provided on the circumference of the disks 12 and 13 to separate sector parts, each of which contain5 two cutting bits 2 and one fixing screw 14.
Both edges of the cutting ring 2 serve as cutting bits 6, whereby the disk 1 may be rotated in either direction. The disk 1 may be provided in a manner known in prior art with a reversing mèchanism, the reversing of direction taking place over the centre of the tire and the cutting always being towards the outer edge of the tire. To this purpose the disk 1 has been fitted with a mechanism not depicted, to be displaceable in the transverse direction of the tire. In view of producing a roughened surface ` ywl/~ ~ _ 3 ~r~5;~3 after c~ltting, the ring 2 has on its outer ~urface, grooves 7 paralleling its axi~. The cutting grooves produced by the rings
2 as well as the rou~hening grooves produced by the xoughenings 7 are transversal to the tire and therefore they do not interfere with the degassing carried out in connection with the resurfacing of the tire.
As the cutting disk I rotates, the cutting edyes 6 of the cutting ring 2 cut from the wearing surface strip-shaped pieces, which depart through the aperture 8 of the cutting ring 2.
With a speed of the disk 1 about 2000 to 3000 r.p.m., the risk of heating of the cut rubber is extremely high. When cutting rings according to the invention are used, the cutting process as well as the chip removal will be ideal, in addition to which the cutting bits are cooled by the air flowing through the aperture 8, and no detrimental heating will occur. It follows that the work is fast, since no interruptions for cooling are necessary, nor for removal of the rubber mass that ha~ been heated and vulcanized to adhere to an~ clog the cutting bits.
The cutting bits 2 may be made of sintered hard metal, or ceramic bits may be used as well.
Fig. 4 displays another embodiment of the invention, wherein the cutting angle of the cutting ring 2' has been arranged to be adjustable or even to be automatically changeable when the direction of rota~ion of the disk l' is reversed. In this case, too, the disk 1' may consist of two disks 12l and 13' fixed against each other and into which appropriate receiving sockets 9' have been machined for the cutting rings 2'. ~rom the cutting ring 2' an a~m 15 extends through an aperture in the disk 12', its end being ywl/~
: :, , . -: : . . . .
As the cutting disk I rotates, the cutting edyes 6 of the cutting ring 2 cut from the wearing surface strip-shaped pieces, which depart through the aperture 8 of the cutting ring 2.
With a speed of the disk 1 about 2000 to 3000 r.p.m., the risk of heating of the cut rubber is extremely high. When cutting rings according to the invention are used, the cutting process as well as the chip removal will be ideal, in addition to which the cutting bits are cooled by the air flowing through the aperture 8, and no detrimental heating will occur. It follows that the work is fast, since no interruptions for cooling are necessary, nor for removal of the rubber mass that ha~ been heated and vulcanized to adhere to an~ clog the cutting bits.
The cutting bits 2 may be made of sintered hard metal, or ceramic bits may be used as well.
Fig. 4 displays another embodiment of the invention, wherein the cutting angle of the cutting ring 2' has been arranged to be adjustable or even to be automatically changeable when the direction of rota~ion of the disk l' is reversed. In this case, too, the disk 1' may consist of two disks 12l and 13' fixed against each other and into which appropriate receiving sockets 9' have been machined for the cutting rings 2'. ~rom the cutting ring 2' an a~m 15 extends through an aperture in the disk 12', its end being ywl/~
: :, , . -: : . . . .
3~3 pivotally connected with a third disk 16~ The disk 16 r~tates along with the diisk 1', but it has the freedom of movement through a given angle with reference to thie disk 1'. By means of a friction plate 17, the turning of the disk 16 through the said angle with reference to the disk 1' may be caused every time when the rotation of the disk 1' is reversed. It is possible to use instead of the fric~ion plate 17, a fi æ d setting between the disks 1' and 16 so that the cutting angle of the cutting ring 2 may be adjus~ed to any desired value. Such fixed set~ing is possible in practice owing to the fact that it has been found that the de~icP of the invention may be used to machine a tire without periodic changes of the direction of rotation and yet there is no risk of damage to the supporting structures of thie tire, such as the radial ply course.
Al~hough most favourahly the fixing of the cutting rings 2 is between two disks 12, 13, thie fixing may also be accomplished by means of a hoop passed thirough the apertures 8 and which urges thie rings into a groove on thie outer circumference of the unitary disk.
Generally considered7 the speed of rotation of the disk 1 is about ten times that of the tire 10.
It is not absolutely necessary that the cutting rings have the shape of closed rings: cut~ing bit~ shaped like part of the ring, or like thie letter C, may also be used. The shape of the rings ne~d not be circular. it may as well be oval, for instance.
: :
- ywl/,~f~,, 5 --~: . . . .
..
. , . ,,,
Al~hough most favourahly the fixing of the cutting rings 2 is between two disks 12, 13, thie fixing may also be accomplished by means of a hoop passed thirough the apertures 8 and which urges thie rings into a groove on thie outer circumference of the unitary disk.
Generally considered7 the speed of rotation of the disk 1 is about ten times that of the tire 10.
It is not absolutely necessary that the cutting rings have the shape of closed rings: cut~ing bit~ shaped like part of the ring, or like thie letter C, may also be used. The shape of the rings ne~d not be circular. it may as well be oval, for instance.
: :
- ywl/,~f~,, 5 --~: . . . .
..
. , . ,,,
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A device for removing the wearing surface of a tire, which comprises a disk-shaped cutting member formed of two disks detachably joined to each other, the disks having means defining a groove around the periphery of the cutting member and including a number of tire surface cutting bits disposed in the cutting member groove in spaced relationship around the member and being held in the cutting member groove by clamping action when the two disks are joined together;
the cutting bits. each being formed of at least a partial ring having sharp cutting edges, the bits being held in the cutting member groove with portions of the cutting edges exposed, the exposed cutting edges being adapted to cut tire wearing surfaces upon engagement with a tire rotated relative to the device, the rings including means defining peripheral grooves thereabout, the device further including bit retaining strips fastened to the cutting member and passing around the bits in the bit grooves for additionally retaining the bits in the cutting member peripheral groove.
the cutting bits. each being formed of at least a partial ring having sharp cutting edges, the bits being held in the cutting member groove with portions of the cutting edges exposed, the exposed cutting edges being adapted to cut tire wearing surfaces upon engagement with a tire rotated relative to the device, the rings including means defining peripheral grooves thereabout, the device further including bit retaining strips fastened to the cutting member and passing around the bits in the bit grooves for additionally retaining the bits in the cutting member peripheral groove.
2. The device according to claim 1, characterized in that the two disks are formed having means defining a number of radial slits at the circumference thereof to divide edges of each disk into separate sector parts, each sector part containing at least one of the cutting bits and each sector having means for joining the disks together, the cutting bits being thereby positively held between the disks in spite of any dimensional differences due to manufacturing tolerances.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA265,186A CA1053143A (en) | 1976-11-09 | 1976-11-09 | Device for removing the wearing surface of a tire |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA265,186A CA1053143A (en) | 1976-11-09 | 1976-11-09 | Device for removing the wearing surface of a tire |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1053143A true CA1053143A (en) | 1979-04-24 |
Family
ID=4107229
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA265,186A Expired CA1053143A (en) | 1976-11-09 | 1976-11-09 | Device for removing the wearing surface of a tire |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1053143A (en) |
-
1976
- 1976-11-09 CA CA265,186A patent/CA1053143A/en not_active Expired
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