CA1111718A - Method of forming puncture preventing layer for tire and apparatus employed therefor - Google Patents
Method of forming puncture preventing layer for tire and apparatus employed thereforInfo
- Publication number
- CA1111718A CA1111718A CA294,254A CA294254A CA1111718A CA 1111718 A CA1111718 A CA 1111718A CA 294254 A CA294254 A CA 294254A CA 1111718 A CA1111718 A CA 1111718A
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- CA
- Canada
- Prior art keywords
- tire
- sealing material
- stream
- disc
- casing
- 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
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Abstract
ABSTRACT OF THE DISCLOSURE
A method of forming a puncture preventing layer on an inner surface of a pneumatic tire including the steps of extruding sealing material and pulverizing the extruded sealing material into fine particles for coating the inner surface with a layer of the sealing material under pressure through action of centrifugal force. For effecting the above described method in an efficient manner, there is also provided a puncture preventing layer forming apparatus which includes arrangements for holding the tire, extruding the sealing material, and pulverizing the extruded sealing material so as to be coated onto the inner surface of the tire through the action of centrifugal force.
A method of forming a puncture preventing layer on an inner surface of a pneumatic tire including the steps of extruding sealing material and pulverizing the extruded sealing material into fine particles for coating the inner surface with a layer of the sealing material under pressure through action of centrifugal force. For effecting the above described method in an efficient manner, there is also provided a puncture preventing layer forming apparatus which includes arrangements for holding the tire, extruding the sealing material, and pulverizing the extruded sealing material so as to be coated onto the inner surface of the tire through the action of centrifugal force.
Description
7~8 BACKGROUND OF T~IE INVENTION
The present invention relates to pneumatic tires and more particularly, to a method of forming puncture preventing layer on an inner surface of a pneumatic tire and an apparatus employed therefor For forming a puncture preventlng layer on an inner surface of a pneumatic tire, there has been known a method in which such a layer is formed by a sealing material during molding or after molding of a green or unfinished tire, in which case, however, the green tire is further subjected to vulvanization process, and since such sealing material, if comparatively 1 in viscosi.ty, tends to become uneven in qllality during the vulcanization, it is very difficult to obtain the puncture prevention layer of a predetermined quality~
Therefoxe, depending on the kinds o~ the sealing materials, such puncture prevention layer should preferably bè formed after vulcanization of the green tire. In this case, : there may be employed sne method in which a sealing material extruded into a sheet-like form is applied onto the inner surface of the tixe, and another method in which the sealing material is sprayed onto the inner surface of the tire to form thereon the puncture prevention layer. Although the latte~ ~praying method is preferabl2 : 25 due to its simplicity, there are such disadvantages that, in -the known high pres.sure thlgh temperature) spraying, the sealing material must be in a state close to liquid, and if powder ru~her or the like is contained in the sealing material~ clogging may result during the spraying,
The present invention relates to pneumatic tires and more particularly, to a method of forming puncture preventing layer on an inner surface of a pneumatic tire and an apparatus employed therefor For forming a puncture preventlng layer on an inner surface of a pneumatic tire, there has been known a method in which such a layer is formed by a sealing material during molding or after molding of a green or unfinished tire, in which case, however, the green tire is further subjected to vulvanization process, and since such sealing material, if comparatively 1 in viscosi.ty, tends to become uneven in qllality during the vulcanization, it is very difficult to obtain the puncture prevention layer of a predetermined quality~
Therefoxe, depending on the kinds o~ the sealing materials, such puncture prevention layer should preferably bè formed after vulcanization of the green tire. In this case, : there may be employed sne method in which a sealing material extruded into a sheet-like form is applied onto the inner surface of the tixe, and another method in which the sealing material is sprayed onto the inner surface of the tire to form thereon the puncture prevention layer. Although the latte~ ~praying method is preferabl2 : 25 due to its simplicity, there are such disadvantages that, in -the known high pres.sure thlgh temperature) spraying, the sealing material must be in a state close to liquid, and if powder ru~her or the like is contained in the sealing material~ clogging may result during the spraying,
- 2 -1. ' - ~ , .
'7~
thus the sealing material which can be employed being undesirably limited.
Accordingly, an essential object of the present inven-tion is to provide an imp.rcved method of forming puncture preventing layer Eor a pneumatic tire in which a sealing material extrucled even of high viscosity is pulverized into fine particles for being coated uncler pressure onto an inner surface of a pneumatic tire through centrifugal force, without possibility of clogging cluring spraying.
~: 10 SUMMARY OF THE INVENTION
. .
According to the present invention, the method of forming a puncture preventing layer on an inner surface of a pneumatic tire includes the steps of extruding sealing material, and pulverizing the extruded sealing material into fine particles for coating the inner surface of the tire with such sealing material under pressure through action of centrifugal force to form the puncture prevent-ing layer on the inner surface of the tire~
For effecting the above described method in an ~: 2Q ef~icient manner~ there is also provided a puncture preventing layer forming apparatus which includes means Eor holding the tire, means for extruding sealing material, and means for pulverizing the extruded sealing material so as to be coated under pressure onto the inner ~: surface of the tire through action. of centrifugal force, said means for pulverizing the extruded sealing material : ~ 3 -~ ,:
~,..-., ~.
7~3 having a first disc provided at the forward end of said cylinder, and a second disc disposed in a coaxial relation to said first disc with a predetermined clearance provided therebetween, said first and second discs being adapted to be relatively rotated at high speed.
By the above arrangement, it has been made possible to pulverize even a sealing material of high viscosity for efficient spraying of such sealing material onto the inner surface of the tire to form the puncturè preventing ].ayer thereon without possibility of clogging during spraying even when powder rubber or the like happens to be contained in the sealing material, with substantial elimination of disadvantages inherent in the conventional puncture preventi.ng layer forming methods and apparatuses.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other objects and features of the present invention will become apparent from the followins des-cription taken in conjunction with the pr~.ferred embodiment thereof wi.th reference to the accompanyiny drawings, in which;
Fig. 1 is a sectional view of a pneumatic tire, with an inner tube removed away, in which a puncture preventing layer is formed according to the puncture preventing layer forming method and apparatus therefor of the present invention, and ::
.
~ - 4 - .
~ "' 'f ' .
:
L7~
Fig. 2 is a schematic side elevational view, partly in section, showing construction of the puncture preventing la~er forming apparatus of the present invention. I
Be~ore the description of the present invention proceeds, it is to be noted that like parts are designated by like reference numerals th~oughout the drawings.
DETAILED DESCRIPTION OF_THE IN~ENTION
Referring to Fig. 1, the pneumatic tire or tire cover 1 to which the present invention may be applied includes a tread portion la, a pair of opposed side wall portions ld contiguous to both sides of the tread portion la, a pair of bead portions lb in whlch bead cores lc are respectively embedded, and a carcass portion le; for example, of a bias-ply defining the innex surface of the tire 1 in a known manner~ The tire l further includes a puncturepreventing layer P formed according to the method and apparatus of the present in~ention on the inner surface le in a position generally correspondin~ to the tread portion la as shown.
Referring also to Fiy. 2, there is sho~n ~n apparatus T of the present invention for forminy ~he puncture preventing la~er P of Fig. l which generally comprises means for holding the tire 1, means for ex-truding seallng materi~I 4 and means for pulverizing the ext~uded sealiny material for application thereof onto the inner surfaoe le of the tire l under pressure to form the puncture prevellting layer P on said inner :
~ ':
' ~
, : . . .
surface le. More specifically, the apparatus T includes a base pnrtion 16 of rectangular box-like configura~ion for a shif-ting device 12 which is movably disposed at a lower portion of the apparatus T and on which a pair S of spaced columns 16a ex-tend upwardly from the upper surface of the base portion 16 for rotatzlbly supporting therebetween a driving roller 2 having a concave face and associated, through a suitable -transmission means, for example, a chain and sprocket mechanism and the like, with a first motor 14 placed on the base portion 16, and an upper ~rame 16b of generally rectangular shape which also extends upwardly from the surface of the base portion 16 over the spaced columns 16a.
From the top horizontal portion 16b-1 of the rectangular frame 16b, two-spaced supports 16b-2 corresponding in positions to the support cvlumns 16 extend downwardly to support therebetween a guide roller 2~ having a cvrresponding concave race through sliding members l~b-3 slidably fitted over the lower end of the supports 16b-2 to be retained thereat and normally urged downward, for example~ bv s~einy means S disposed around the supports 16b-2, so that when a pneumatic tire 1 is disposed between the rollers 2 and 2l, such a tire is depressed toward the dr.iving roller 2 by the guide ro~ler 2' ar.d held ~etween the rollers 2 and 2' in a known manner.
In positions adjaceIIt to the bead portions lb (Fig. 1 of the tire 1, there are disposed cylinders 3 each having a xotary e~randing wheel lS at its forward end for expanding the bead portions lb of ~he tire 1 :
, , - - : .
7~L~
outwardly and secured to corresponding brackets extending inwardly from the upper frame 16 as shown.
It should be noted here that each of the cylinders 3 is coupled to a source 100 of working medium or power fluid through a suitable control device 101 as shown by chain lines in Fig. 2.
The base portion 16 of the shifting device 12 further includes a plurality of wheels 17 provided for displacement of the base portion 16 on the lower lQ surface thereof, which wheels 17 are rotatable on a guide rail 20 disposed on the ground level, and a screw bar 19 hori~ontally extending in said base portion 1~ and threadedly engaged with a corresponding threaded member 19a which is rotatably supported on a support or stopper l9b secured to the guide rail 20 to be associated with a second motor 18, for example, through a chain and sprocket mechanism.
Accordir.gly, upon rota-tion of the second mokor 18, the base portion 16 is movable together with the drive roller 2, quide roller 2', and cylinders 3 supported on the spaced columns 16a and rectangular frame 16b in directions indicated by the arrow a, i.e., in the axi~1 direction of the tire 1 held bet~een ; the rollers 2 and 2'.
; 2S The apparatus T fu~ther comprises a sealing material spraying device 21 fixedly disposed, for example, at the right of the axis of the tire 1 on an L~shaped frame F extending upwardly from the ground.
The =aaling material supplying device 21 includes a ~: :
_ 7 _ : ' . .
cylinder 6 enclosed in a heating device 13 and a piston S housed in the cylinder 6 and coupled with the working medium source 100 through the control device 101 for reciprocation within the cylinder 6 so as to extrude the sealing materia. 4 contained in the cyl~nder 6 through a bore 7 of small diameter which is formed in the forward portion of said cylinder 6 and open at a fixed disc 10 provided on the distal end of the cylinder 6.
In a corresponding position facing the fixed disc 10 at the left side of the axis of the tire 1, there is provided a rotary disc 9 in a coaxial relation to the fixed disc 10, with the rotary disc 9 beiny coupled, for high speed rotation thereof in a direction shown by an arrow, with a shaft of a third motor 22 which is secured adjacent to one end of a support shaft 11. The other end of the supported shaft 11 is threaded for engagement with one end of a screw bar ~4 rotatably mounted on an upper horizontal a-m F~. of the 2Q rame F, while the other end of the screw bar 24 is associated for ro~ation with a fourth motox 23, for example, by a chain and sprocket mechanism and the like. Since the support shaft 11 is prevented ~ro~
rotation by a guide me~ber or stopper lla secured, at 25: its one end, to a corresponding end oi the horizontal arm Fa of the frame E~ said support shaft 11 together with the motor 22, and rotary disc 9 can be seleotively moved in the directiGns indicated by axrows b upon rotation of the screw bar ~4 in the direction shown by . - 8 -.
-, , "
- the motor 23, by which arrarlcJement, it is possible to set the tire 1 be-tween the rollers 2 and 2' or remove the same tire 1 held between the said rollers 2 and 2', while simul-taneously, -the ro-tary disc 9 can be helcl in position wi-th respect to -the fixed disc 10, with a small clearance 8 provided therebetween for spraying the sealing material 4 there-through onto the inner surface le of the tire 1.
With the employment of the apparatus T as described in th~ foregoing, the method of forming the puncture preventing layer P in the irner surface le of the tire 1 will be described step by step hereinbelow.
(1) After the rotary disc 9 has been retracted to the left in Fig. 2, the tire 1 is mounted on the driviny roller 2 for being held in position between the guid roller 2' and driving roller 2.
(2) The bead portions lb of the tire 1 are ex-panded ~oward the lefL and right sides of the tire axis up to predetermi.led positions by the cylinders 3 having the expanding wheels 15.
t3~ The rotary disc 9 is brought toward the fixed di c 10 up to such a position that there is provided the pxedete.-mined c~.eararlce 8 therebetween.
(4 ) The tire 1 held between the rollers 2 and is rotated at a low speed by driving the d.riving roller 2.
(5~ By operatirly the piston 5 r the sealing material 4 accommodated in the cylinder 6 is extruded through the bore 7 and the clearance 8.
(6) Simultaneously with or before or after the procedure in the above ltem 5, the rotary disc 9 i5 rotated at a high speed ~or spraying the sealing material 4 through centriEugal force.
(7) Meanwhile, the tire 1 held between the rollexs 2 and 2' is moved at a low speed from the left to the right or from the right to the left in Fig. 2 along the axis oE the tire l so that the sealing material 4 is sprayed only onto the prede~ermined portion of the inner surface le of the tire 1.
(8) Upon completion o~ the spraying, the rotary disc 9 is spaced away from the fixed disc 10, and the tire l held between the rollers 2 and 2' is removed.
It should be noted here that the method o:E
forming puncture preventing layer according to the present invention is not limited, in its application to the foregoing procedures, but may be altered in its order within the scope depending on the necessity.
It should also be noted that in the apparatus T according to the present invention, the fixed disc lO
and the rotary disc 9 may be modifled to b~ changed in their posi~ions with each other, or to be rotated in directions opposi~b to each other. In any case, in the present invention, these two discs 9 and lO o.m means for pulverizing the sealing material and applying the same under pressure onto the inner surface of the tire ; through centrifugal forca.
It is urther to be noted that the angle an~ the like of the clearance 8 formed bet-~een the two discs 9 and 10 may be suitably selecte~ to provide ~L~
the optimum condition for the spraying.
Given below is one Example carried out throuyh the method as described in the foxegoing with the em-ployment of the apparatus T according to the present invention.
Example W~= tions (i) Composition of the sealing material Polybutene 100 ~olyisobutylene 20 Aexogel 20 Po~der rubber 30 (ii) Temperature of sealing material 150C
(iii) Distance of the clearance 8 i 1.5mm ~i~) Revolutions of the rotary disc 9 4,500r~p.m.
Results The puncture preventing layex of the pre-determined thickness could be formed.
According to the method of the present in-~ention as descri~ed in the foregoing, it is possibleto pulverize e~en a hign viscosity sealing material (for example, having 100,000 cps at a temperature of 150Cj which was con.sidered impossible to be formed into spra~ up to the present for application onto the inner surfaces of ires under pressure through action of centrifugal ~orce. It is another advantage of the metho~ and a~paratus according to the present invention that even a sealing material containing therein powder rubber and the like aan be coated under pressure onto .. .
.
the inner surfaces o tires without causin~ inconveniences such as clogging during spraying inherent in the conven tional methocls and arrangements.
Although the present invention has been fully described by way of example with reference to the attached drawings, it is to be noted that vari.ous changes and modifications are apparent to those skilled in the art. Therefore, unless otherwise such changes and modif1cations depart from the scope of the present invention, they should be construed as included therein.
'7~
thus the sealing material which can be employed being undesirably limited.
Accordingly, an essential object of the present inven-tion is to provide an imp.rcved method of forming puncture preventing layer Eor a pneumatic tire in which a sealing material extrucled even of high viscosity is pulverized into fine particles for being coated uncler pressure onto an inner surface of a pneumatic tire through centrifugal force, without possibility of clogging cluring spraying.
~: 10 SUMMARY OF THE INVENTION
. .
According to the present invention, the method of forming a puncture preventing layer on an inner surface of a pneumatic tire includes the steps of extruding sealing material, and pulverizing the extruded sealing material into fine particles for coating the inner surface of the tire with such sealing material under pressure through action of centrifugal force to form the puncture prevent-ing layer on the inner surface of the tire~
For effecting the above described method in an ~: 2Q ef~icient manner~ there is also provided a puncture preventing layer forming apparatus which includes means Eor holding the tire, means for extruding sealing material, and means for pulverizing the extruded sealing material so as to be coated under pressure onto the inner ~: surface of the tire through action. of centrifugal force, said means for pulverizing the extruded sealing material : ~ 3 -~ ,:
~,..-., ~.
7~3 having a first disc provided at the forward end of said cylinder, and a second disc disposed in a coaxial relation to said first disc with a predetermined clearance provided therebetween, said first and second discs being adapted to be relatively rotated at high speed.
By the above arrangement, it has been made possible to pulverize even a sealing material of high viscosity for efficient spraying of such sealing material onto the inner surface of the tire to form the puncturè preventing ].ayer thereon without possibility of clogging during spraying even when powder rubber or the like happens to be contained in the sealing material, with substantial elimination of disadvantages inherent in the conventional puncture preventi.ng layer forming methods and apparatuses.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other objects and features of the present invention will become apparent from the followins des-cription taken in conjunction with the pr~.ferred embodiment thereof wi.th reference to the accompanyiny drawings, in which;
Fig. 1 is a sectional view of a pneumatic tire, with an inner tube removed away, in which a puncture preventing layer is formed according to the puncture preventing layer forming method and apparatus therefor of the present invention, and ::
.
~ - 4 - .
~ "' 'f ' .
:
L7~
Fig. 2 is a schematic side elevational view, partly in section, showing construction of the puncture preventing la~er forming apparatus of the present invention. I
Be~ore the description of the present invention proceeds, it is to be noted that like parts are designated by like reference numerals th~oughout the drawings.
DETAILED DESCRIPTION OF_THE IN~ENTION
Referring to Fig. 1, the pneumatic tire or tire cover 1 to which the present invention may be applied includes a tread portion la, a pair of opposed side wall portions ld contiguous to both sides of the tread portion la, a pair of bead portions lb in whlch bead cores lc are respectively embedded, and a carcass portion le; for example, of a bias-ply defining the innex surface of the tire 1 in a known manner~ The tire l further includes a puncturepreventing layer P formed according to the method and apparatus of the present in~ention on the inner surface le in a position generally correspondin~ to the tread portion la as shown.
Referring also to Fiy. 2, there is sho~n ~n apparatus T of the present invention for forminy ~he puncture preventing la~er P of Fig. l which generally comprises means for holding the tire 1, means for ex-truding seallng materi~I 4 and means for pulverizing the ext~uded sealiny material for application thereof onto the inner surfaoe le of the tire l under pressure to form the puncture prevellting layer P on said inner :
~ ':
' ~
, : . . .
surface le. More specifically, the apparatus T includes a base pnrtion 16 of rectangular box-like configura~ion for a shif-ting device 12 which is movably disposed at a lower portion of the apparatus T and on which a pair S of spaced columns 16a ex-tend upwardly from the upper surface of the base portion 16 for rotatzlbly supporting therebetween a driving roller 2 having a concave face and associated, through a suitable -transmission means, for example, a chain and sprocket mechanism and the like, with a first motor 14 placed on the base portion 16, and an upper ~rame 16b of generally rectangular shape which also extends upwardly from the surface of the base portion 16 over the spaced columns 16a.
From the top horizontal portion 16b-1 of the rectangular frame 16b, two-spaced supports 16b-2 corresponding in positions to the support cvlumns 16 extend downwardly to support therebetween a guide roller 2~ having a cvrresponding concave race through sliding members l~b-3 slidably fitted over the lower end of the supports 16b-2 to be retained thereat and normally urged downward, for example~ bv s~einy means S disposed around the supports 16b-2, so that when a pneumatic tire 1 is disposed between the rollers 2 and 2l, such a tire is depressed toward the dr.iving roller 2 by the guide ro~ler 2' ar.d held ~etween the rollers 2 and 2' in a known manner.
In positions adjaceIIt to the bead portions lb (Fig. 1 of the tire 1, there are disposed cylinders 3 each having a xotary e~randing wheel lS at its forward end for expanding the bead portions lb of ~he tire 1 :
, , - - : .
7~L~
outwardly and secured to corresponding brackets extending inwardly from the upper frame 16 as shown.
It should be noted here that each of the cylinders 3 is coupled to a source 100 of working medium or power fluid through a suitable control device 101 as shown by chain lines in Fig. 2.
The base portion 16 of the shifting device 12 further includes a plurality of wheels 17 provided for displacement of the base portion 16 on the lower lQ surface thereof, which wheels 17 are rotatable on a guide rail 20 disposed on the ground level, and a screw bar 19 hori~ontally extending in said base portion 1~ and threadedly engaged with a corresponding threaded member 19a which is rotatably supported on a support or stopper l9b secured to the guide rail 20 to be associated with a second motor 18, for example, through a chain and sprocket mechanism.
Accordir.gly, upon rota-tion of the second mokor 18, the base portion 16 is movable together with the drive roller 2, quide roller 2', and cylinders 3 supported on the spaced columns 16a and rectangular frame 16b in directions indicated by the arrow a, i.e., in the axi~1 direction of the tire 1 held bet~een ; the rollers 2 and 2'.
; 2S The apparatus T fu~ther comprises a sealing material spraying device 21 fixedly disposed, for example, at the right of the axis of the tire 1 on an L~shaped frame F extending upwardly from the ground.
The =aaling material supplying device 21 includes a ~: :
_ 7 _ : ' . .
cylinder 6 enclosed in a heating device 13 and a piston S housed in the cylinder 6 and coupled with the working medium source 100 through the control device 101 for reciprocation within the cylinder 6 so as to extrude the sealing materia. 4 contained in the cyl~nder 6 through a bore 7 of small diameter which is formed in the forward portion of said cylinder 6 and open at a fixed disc 10 provided on the distal end of the cylinder 6.
In a corresponding position facing the fixed disc 10 at the left side of the axis of the tire 1, there is provided a rotary disc 9 in a coaxial relation to the fixed disc 10, with the rotary disc 9 beiny coupled, for high speed rotation thereof in a direction shown by an arrow, with a shaft of a third motor 22 which is secured adjacent to one end of a support shaft 11. The other end of the supported shaft 11 is threaded for engagement with one end of a screw bar ~4 rotatably mounted on an upper horizontal a-m F~. of the 2Q rame F, while the other end of the screw bar 24 is associated for ro~ation with a fourth motox 23, for example, by a chain and sprocket mechanism and the like. Since the support shaft 11 is prevented ~ro~
rotation by a guide me~ber or stopper lla secured, at 25: its one end, to a corresponding end oi the horizontal arm Fa of the frame E~ said support shaft 11 together with the motor 22, and rotary disc 9 can be seleotively moved in the directiGns indicated by axrows b upon rotation of the screw bar ~4 in the direction shown by . - 8 -.
-, , "
- the motor 23, by which arrarlcJement, it is possible to set the tire 1 be-tween the rollers 2 and 2' or remove the same tire 1 held between the said rollers 2 and 2', while simul-taneously, -the ro-tary disc 9 can be helcl in position wi-th respect to -the fixed disc 10, with a small clearance 8 provided therebetween for spraying the sealing material 4 there-through onto the inner surface le of the tire 1.
With the employment of the apparatus T as described in th~ foregoing, the method of forming the puncture preventing layer P in the irner surface le of the tire 1 will be described step by step hereinbelow.
(1) After the rotary disc 9 has been retracted to the left in Fig. 2, the tire 1 is mounted on the driviny roller 2 for being held in position between the guid roller 2' and driving roller 2.
(2) The bead portions lb of the tire 1 are ex-panded ~oward the lefL and right sides of the tire axis up to predetermi.led positions by the cylinders 3 having the expanding wheels 15.
t3~ The rotary disc 9 is brought toward the fixed di c 10 up to such a position that there is provided the pxedete.-mined c~.eararlce 8 therebetween.
(4 ) The tire 1 held between the rollers 2 and is rotated at a low speed by driving the d.riving roller 2.
(5~ By operatirly the piston 5 r the sealing material 4 accommodated in the cylinder 6 is extruded through the bore 7 and the clearance 8.
(6) Simultaneously with or before or after the procedure in the above ltem 5, the rotary disc 9 i5 rotated at a high speed ~or spraying the sealing material 4 through centriEugal force.
(7) Meanwhile, the tire 1 held between the rollexs 2 and 2' is moved at a low speed from the left to the right or from the right to the left in Fig. 2 along the axis oE the tire l so that the sealing material 4 is sprayed only onto the prede~ermined portion of the inner surface le of the tire 1.
(8) Upon completion o~ the spraying, the rotary disc 9 is spaced away from the fixed disc 10, and the tire l held between the rollers 2 and 2' is removed.
It should be noted here that the method o:E
forming puncture preventing layer according to the present invention is not limited, in its application to the foregoing procedures, but may be altered in its order within the scope depending on the necessity.
It should also be noted that in the apparatus T according to the present invention, the fixed disc lO
and the rotary disc 9 may be modifled to b~ changed in their posi~ions with each other, or to be rotated in directions opposi~b to each other. In any case, in the present invention, these two discs 9 and lO o.m means for pulverizing the sealing material and applying the same under pressure onto the inner surface of the tire ; through centrifugal forca.
It is urther to be noted that the angle an~ the like of the clearance 8 formed bet-~een the two discs 9 and 10 may be suitably selecte~ to provide ~L~
the optimum condition for the spraying.
Given below is one Example carried out throuyh the method as described in the foxegoing with the em-ployment of the apparatus T according to the present invention.
Example W~= tions (i) Composition of the sealing material Polybutene 100 ~olyisobutylene 20 Aexogel 20 Po~der rubber 30 (ii) Temperature of sealing material 150C
(iii) Distance of the clearance 8 i 1.5mm ~i~) Revolutions of the rotary disc 9 4,500r~p.m.
Results The puncture preventing layex of the pre-determined thickness could be formed.
According to the method of the present in-~ention as descri~ed in the foregoing, it is possibleto pulverize e~en a hign viscosity sealing material (for example, having 100,000 cps at a temperature of 150Cj which was con.sidered impossible to be formed into spra~ up to the present for application onto the inner surfaces of ires under pressure through action of centrifugal ~orce. It is another advantage of the metho~ and a~paratus according to the present invention that even a sealing material containing therein powder rubber and the like aan be coated under pressure onto .. .
.
the inner surfaces o tires without causin~ inconveniences such as clogging during spraying inherent in the conven tional methocls and arrangements.
Although the present invention has been fully described by way of example with reference to the attached drawings, it is to be noted that vari.ous changes and modifications are apparent to those skilled in the art. Therefore, unless otherwise such changes and modif1cations depart from the scope of the present invention, they should be construed as included therein.
Claims (10)
1. A method of forming a puncture preventing layer on an inner surface of a pneumatic tire comprising the steps of extruding sealing material, and pulverizing the extruded sealing material into fine particles for coating the inner surface of the tire with the sealing material under pressure through action of centrifugal force to form the puncture preventing layer on the inner surface of the tire.
2. A method as claimed in Claim 1, further including the step of rotating the tire held in position, with bead portion thereof expanded, and simultaneously moving the tire in a direction of its axis relatively with respect to position whereat the coating is effected under pressure through the centrifugal force for applying the sealing material in heated state onto the inner surface of the tire.
3. An apparatus for forming a puncture preventing layer on an inner surface of a pneumatic tire which comprises means for holding the tire, means for extruding sealing material, and means for pulverizing the extruded sealing material so as to be coated under pressure onto the inner surface of the tire through action of centrifugal force, said means for pulverizing the extruded sealing material having a first disc provided at the forward end of said cylinder, and a second disc disposed in a coaxial relation to said first disc with a predetermined clearance provided therebetween, said first and second discs being adapted to be relatively rotated at high speed.
4. An apparatus as claimed in Claim 3, wherein said tire holding means is an arrangement for holding and rotating the tire.
5. An apparatus as claimed in Claim 4, wherein said tire holding and rotating arrangement is provided with a driving roller to be driven by driving means and a guide roller which freely rotates following rotation of said driving roller.
6. An apparatus as claimed in Claim 3, wherein said tire holding means is relatively movable in a direction of an axis of the tire with respect to said means for pulverizing the extruded sealing material.
7. An apparatus as claimed in Claim 3, wherein said seal-ing material extruding means is provided with a cylinder equipped with a heating device and having opening of small diameter at a forward end portion of said cylinder, and a piston reciprocatingly accommodated in said cylinder.
8. An apparatus as claimed in Claim 3, further including means for expanding the bead portion of the tire.
9. An apparatus for coating the inner surface of a pneumatic tire casing with a liquid puncture sealing material having a high viscosity, said apparatus comprising means for supporting and rotating a pneumatic tire casing having an annular open radially inner side, said means being movable in the direction of the axis of the pneumatic tire, means comprising a piston and cylinder arrangement disposed adjacent to the open side of the tire casing for spreading the casing apart at its beads, means for extruding a stream of said sealing material, means for intercepting and forming a spray of the extruded stream of sealing material and for directing the spray under centrifugal force through said open side against the inner wall of the casing comprising a pair of plate-like spaced facing discs disposed to intercept the stream in the space therebetween, one of said discs being rotatable relative to the other and having a flat surface on which said stream of sealing material impinges, means for rotating said disc on which said stream impinges relative to the other while said rotatable disc is disposed to intercept the stream in said space and propel the sealing material radially outwardly through the open side of the casing as a spray and against said inner wall, and means for moving one of said discs to and fro with respect to the other disc to vary the spacing of the discs relative to each other.
10. An apparatus for coating the inner surface of a tire casing with a puncture sealing material having a high viscosity, said apparatus comprising means for extruding a stream of said puncture sealing material, means disposed to intercept and break up the result-ing stream into a spray comprising a first disc having an opening therethrough for passage of said stream and dis-posed across the stream with the opening aligned therewith, and a second disc disposed across the stream spaced down-stream of and facing the first disc, said second disc having a flat surface which intercepts the stream, means for rotating the disc having said flat surface whereby the stream impinging thereon is propelled radially outwardly from the space between the discs as a spray, means for supporting and rotating a tire casing having an annular inner open side with the open side disposed to receive the said spray, said supporting and rotating means comprising a pair of spaced rollers disposed to press against the radial outer surface of the tire casing diametrically opposite each other, means for biasing a first of said pair of rollers against the tire casing, means for rotating the second of said pair of rollers to rotate the tire casing, means for moving the said rollers relative to the said spray for interception thereof, and means for spreading the open side of the casing com-prising a pressure cylinder having a reciprocating piston therein, said piston fixed to a piston rod which extends externally of the pressure cylinder and having a rotary disc fixed to its exposed end and disposed on each side of the tire casing adjacent said open side for spreading the casing apart to enlarge the opening for reception of the spray.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA294,254A CA1111718A (en) | 1978-01-03 | 1978-01-03 | Method of forming puncture preventing layer for tire and apparatus employed therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA294,254A CA1111718A (en) | 1978-01-03 | 1978-01-03 | Method of forming puncture preventing layer for tire and apparatus employed therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1111718A true CA1111718A (en) | 1981-11-03 |
Family
ID=4110432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA294,254A Expired CA1111718A (en) | 1978-01-03 | 1978-01-03 | Method of forming puncture preventing layer for tire and apparatus employed therefor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1111718A (en) |
-
1978
- 1978-01-03 CA CA294,254A patent/CA1111718A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |