NZ198787A - Self-sealing curing rim for large tubeless tyres - Google Patents

Description

198787 Priority Da?3(s): Complete Specification Filed: t \/-i| Class: ° ^^30\S4- Pubilcstion Data: ... ... OCT .1981..

P.O. Journal, fio: . , NEW ZEALAND No.: Date: #1 We, PATENTS ACT, 1953 Htf. PATENT OFFICE 28 OCT 1981 r .RECEIVED ^ COMPLETE SPECIFICATION SELF-SEALING CURING RIM FOR TUBELESS EARTHMOVER TIRE BRANICK MFG., INC., a corporation organized under the laws of the State of North Dakota, 2600 Third Avenue North, Fargo, North Dakota 58107, U.S.A. hereby declare the invention for which £c/ we pray that a patent may be granted tox&e/us, and the method by which it is to be performed, to be particularly described in and by the following statement: - _ 1 - (followed by page la) 198787 ■SELF*SEALING GURIHO RIM FOR TUDELEOD EARTUMOVER TIRE Technical Field This invention relates generally to apparatus for supporting a vehicle tire during a curing operation and more particularly relates to self-sealing curing rim apparatus for large tubeless tires.

Background of the Invention During a curing operation, the vehicle tire is typically mounted on a curing rim which may consist of two or more sections which are connected together to encompass the tire during the curing operation. After the tire is mounted on the curing rim, it is necessary to initially expand or inflate the tire into a sealing relationship with the curing rim sd^hat full pressure can be applied to the tire to maintain it in position during a curing operation. Because the tire is not initially sealed to the rim, it has been necessary in the past to take special steps or utilize additional sealing apparatus to achieve the initial seal. Surge tanks have been used to inflate the tire very rapidly. Other systems have employed sealing bands or inner tubes. A system employing an inner tube is disclosed in the Peterson U.S. Patent No. 4, 051, 881.

Brief Summary of the,Invention The curing rim of the present invention includes apparatus for sealing the tire at the bead while the tire is inflated, and requires no inner tubes, sealing bands or surge tanks to accomplish the initial sealing. The tire can be inflated by a standard quarter inch air line. In particular, the curing rim includes a two-part body having a tire bead engaging portion at one end, a cylindrical central portion which extends through the tire, and a stop flange at the opposite, upper end. A flanged sealing 1987 87 sleeve is telescopically mounted around • the cylindrical portion and includes^ a tire bead engaging portion to maintain an air-tight seal with the bead of the tire as the tire is inflated. The sealing sleeve also has a 5 cylindrical inner wall portion which carries an O-ring seal to sealingly engage the cylindrical wall portion of the body to prevent air leaking between them as the tire is inflated. The sealing sleeve and the body initially cooperate to seal the top and bottom tire beads, and as 10 the tire is inflated, the sealing sleeve is carried upwardly with the top tire bead and eventually seats against the stop flange on the body where it continues to maintain an air-tight seal while the tire is being fully inflated.

Brief Description of the Drawings FIGURE 1 is an exploded perspective view of the present invention and a vehicle tire to be mounted on the self-sealing curing rim^ FIGURE—is a top plan view of the locking 20 sleeve shown in FIGURE 1; FIGURE 3 is a top plan view of the first sleeve shown in FIGURE 1; and FIGURE 4 is an enlarged sectional view of the curing rim mounted on an inflated vehicle tire, portions 25 thereof being broken away.

' Description of the Preferred Embodiment Referring now to the drawings, wherein like .reference numerals are used throughout the several views to indicate like elements of the invention, there is 30 disclosed a typical large tubeless tire 10 of the type used for earthmovers or the like. Tire 10 has a bead 11 on each side and an adjoining side wall portion 12. The curing rim of the present invention comprises three major parts, a first, flanged sleeve or sleeve member 13, a 35 flanged sealing sleeve or sleeve member 14, and a locking sleeve or sleeve member 15. First sleeve 13 has a generally tubular body 16 with an annular, outwardly extending 198787 flange 13a attached to a first, bottom end perpendicular thereto. Tubular body 16 includes a lower body portion 16a which is cylindrical in shape and which has an outside diameter corresponding to the diameter of the bottom bead 5 11 of tire 10. Tubular body 16 also includes an upper body portion 16b of slightly smaller outside diameter which includes a cylindrical inner wall portion 16c at the top end. Wall portion 16c is of larger diameter than the remaining lower,-inner portion 16d. A plurality of metal 10 blocks or lugs 17 are welded to wall portion 16d at spaced intervals around its periphery, and a flat, annular metal ring 18 is welded to the blocks 17. An annular groove 19 is formed in cylindrical inner wall portion 16c, the groove lying in a plane perpendicular to the axis of 15 tubular body 16; and an 0-ring 20 is mounted in groove 19.

It can be seen from FIGURE 1 that when tire 10 is placed over first sleeve 13, the bottom bead 11 engages lower body portion lSa^and the inner side wall portion 12 engages flange l-3a to provide - an air-tight seal at that 20 bead of the tire.

Flanged sealing sleeve 14 includes a tubular body portion 22 having an outside diameter corresponding to the diameter of bead 11 so that it snugly engages the bead when inserted into the tire 10. Attached to the top 25 end of tubular body portion 22 is an annular, outwardly , extending flange 23, lying in a plane perpendicular to the axis of tubular portion 22. Flange 23 is designed to engage side wall portion 12 to aid in sealing the tire as it is inflated. Tubular body portion 22 of sealing sleeve 30 14 also has a cylindrical inner wall 24 of the same diameter as cylindrical inner wall 16c of first sleeve 13. An annular groove 25 is formed in cylindrical inner wall 24 and lies in a plane perpendicular to the axis of tubular body portion 22; and an O-rihg 2 6 is mounted in groove 35 25. Sealing sleeve 14 can be inserted into the top of tire 10 as shown to provide an air-tight seal between it and the tire bead 11. 198787 Locking sleeve 15 includes a tubular body portion 30 having an outside diameter corresponding to the inside diameters of cylindrical inner wall 24 and cylindrical inner wall 16c. An annular stop flange 31 is mounted at the top, first end of locking sleeve 15, and lies in a plane perpendicular to the axis of tubular body portion 30. Mounted to the cylindrical inner wall 32 of locking sleeve 15 at spaced intervals are a plurality of downwardly extending hooks 33, equal in number to the lugs 17 of first sleeve 13. An air inlet valve assembly 34 is mounted in tubular body portion 30 to permit an operator to inject compressed air into the tire 10. A metal ring 35, corresponding in size to metal ring 18, is welded to the ring of hooks 33 within the tubular body portion 30. A pair of closing loops 36, 36a are welded to the inner edge of metal ring 35 and a corresponding pair of closing loops 21, 21a are welded to the inner edge of metal ring 18. Corresponding metal>tabs 37 and-38 are also welded to the inner edges T^f rings 35 and 18 respectively, each having a hole formed therein.

When it is desired to mount a tire 10 on the self-sealing curing rim assembly of the present invention, the first sleeve 13 is normally placed with the flanged first end 13a on some wood blocks to elevate it from the floor. In this position, which is shown in FIGURE 1, the tubular body 16 extends upwardly, and the tire 10 is then placed over the tubular body 16 so that the bottom bead 11 seals against the lower body portion 16a and the flange 13a supports the lower side wall portion 12. The O-ring 20 is mounted in groove 19. The sealing sleeve.14 is then telescoped over the locking sleeve 15 so that the O-ring 26 in groove 25 sealingly engages tubular body portion 30 which is machined to tightly fit against the O-ring. After the sealing sleeve 14 has been inserted over the locking sleeve 15 with the flanged end 23 facing the stop flange 31, the combined unit is lowered into the tire 10 so that the tubular body portion 22 sealingly engages the 198787 upper bead 11 and flange 23 supports side wall portion 12, and so that the hooks 33 extend between the lugs 17. Although not shown in detail on the drawings, the respective hooks 33 and lugs 17 should be arranged so that the 5 same hook will always be matched with the same lug. After insertion, the locking sleeve 15 is rotated so that the hooks extend beneath the lugs 17 to prevent axial separation of the locking sleeve 15 from first sleeve 13. Although not shown on the drawings, a rod-like tool can be 10 used in cooperation with the closing loops 36, 36a and 21, 21a to effect relative rotation between the two sleeves, and after the sleeves are properly aligned, a. pin can be inserted through the holes in matching tabs 37, 38 to lock the sleeves in place. If not already in place, the seal-15 ing sleeve 14 should be pushed down tightly against the tire to seal the tire bead. The tire can then be inflated through the air inlet 34 with a standard one-quarter inch compressed air line. bottom bead is initially sealed by first sleeve 13-, and the top bead is initially sealed 20 by sealing sleeve 14 so that air does not leak between the sleeves and the tire. At the same time, the.bottom end of tubular body portion 30 is telescoped into the cylindrical inner wall 16c of first sleeve 13, and the gap between them is sealed by O-ring 20. The space between sealing 25 sleeve 14 and locking sleeve 15 is sealed by the O-ring 26. As air is inserted into the tire, the tire expands upwardly and carries with it sealing sleeve 14 which moves upwardly along wall portion 30 until flange 23 engages stop flange 31, at which point the sealing sleeve 14 is 30 blocked from further movement and the tire can be com-pletedly inflated.

The assembled curing rim with tire mounted thereon, can then be handled in normal fashion throughout the treating process. After the treatment is completed, 35 the tire 10 is deflated which permits the sealing sleeve 14 to be forced downwardly until locking sleeve 15 can be rotated to release the hooks. 33 from lugs 17. 198787 Although not shown on the drawings, it should be noted that one curing rim assembly can be used for several widths of tires by using one or more spacer rings between first sleeve 13 and locking sleeve 15.

The present invention eliminates the need for sealing bands, surge tanks or the like because the sealing sleeve 14 maintains an air-tight seal as the tire is inflated and moves with the expanding tire until blocked by the stop member 31 of the locking sleeve 15. At the 10 same time, means are provided to seal between the three sleeves so that air cannot leak from the tire as it is being inflated. — - ^ -ft. 1164 1987

Claims (4)

CLAIMS WHAT^WE CLAIM IS:
1. A rim for supporting an earthmover or other vehicle tire during a curing operation, the rim comprising: (a) a first sealing member adapted to engage the tire' at a first tire bead when the tire is in an inflated condition; (b) a second sealing member adapted to engage the tire at a second tire bead when the tire is in an inflated condition; (c) a locking member for telescopic engagement within said second sealing member, soid locking member having stop means to limit the extent of said telescopic engagement; t (d) securing means for releasably securing together said first sealing member and the locking member; (e) sealing means to provide a seal between the second sealing member and the locking member; and (f) conduit means for introducing inflating air into the tire; whereby when the locking member is in telescopic engagement with the second sealing member and secured to by the securing means/the first sealing member and inflating air is introduced into the tire through said -7- 1987 conduit means, said first and second seaLing members are brought into, or maintained in, sealing relationship with the respective tire beads, and said second sealing member can move with respect to the locking member as the tire is inflated until blocked by the stop means.
2. A rim according i;o Claim 1, in which the first sealing member is a sleeve having a flanged first end and a second end; / the second sealing member is a sleeve having a cylindrical inner surface with an annular groove formed therein; the locking member is a sleeve having first and second ends, comprising a cylindrical outer wall portion and an annular stop flange at said first end, telescoped within said second sealing member to permit relative axial movement therebetween; the securing means is for securing together said first sealing member and the locking member at their second ends for support between them of a vehicle tire during a curing operation; and said groove has a gasket therein to engage said cylindrical outer wall portion. -8- -9- 198787
3. 3* A rim according to claim 2 wherein said first sealing member comprises a cylindrical innr-r wo 11 portion at said second end, wherein said second end of said locking member is telescoped within said cylindrical inner wall portion of said first sealing member, and wherein second sealing means is mounted between said telescoped first sealing ' member and locking member. ~9JULftQj
4. 4. A rim according to Claim 1 in which said first sealing member is a sleeve adapted to engage one side and the bead of the tire; said second sealing member is a sleeve adapted to engage the side and"T)ead of the tire opposite from the first sleeve, said second sealing member having a cylind- locking rical inner surface; the/member is a locking sleeve having a cylindrical outer wall portion telescoped v/ithin said sealing sleeve to permit relative axial movement there betv/een, and its stop means is an annular stop flange at one end; and the rim has second sealing means for providing a seal between said first sealing member and said locking member. P5. A rim according to claim 4, wherein said first sealing member has opposite ends and comprises a cylindrical inner wall portion at one end and a flange at the other end, wherein an end of said locking member opposite said stop flange is telescoped v/ithin said cylindrical inner wall portion of said first sealing member, and where in said second sealing means is mounted between said telescoped first sealing and locking members. -9- 198787 A rim according to claim 4 or 5, wherein said second sealing means comprises an annular groove formed in one of said cylindrical wall portions of said first sealing member and locking member, and an O-ring in said groove. member has opposite ends with an annular flange at one end, and wherein said means for providing a seal between said locking member and said second sealing member comprises an annular groove formed in one of said cylindrical wall portions an O-ring in said groove. A rim according to claim 7, wherein said groove is formed in said second sealing member. A rim according to claim 4, in which the securing means comprises a plurality of parallel bolts disposed axially of the locking member, each bolt having a hook formed thereon,and engagement means carried by the first sealing member for engagement with the hooks; and the locking member and second sealing member are adapted for relative rotation while telescoped together so that the hooks can be engaged with and disengaged from the engagement means as desired. A rim according to claim 4 wherein said second sealing of said locking member and saictr-second sealing member, and -10 7 > ,,, < o 11- 198787 10. A rim according to claim 1, having a body comprising said first sealing member and the locking member, said body having a flange-like tire bead-engaging portion formed integrally therewith at one end, a central portion adapted to extend through the tire and a flange-like stop member formed integrally therewith at an opposite end; said second sealing member comprising a sleeve surrounding said central portion, the sealing §eeve having a tire bead-engaging portion to maintain an air-tight seal with the bead of the tire sleeve as the tire is inflated and said sealing/having associated therewith separate sealing means for^-sealingly engaging said central portion to prevent air^leaking therebetween as said sealing sleeve moves along said central portion until blocked by said stop member as the tire is inflated. 11. A rim according to claim 1, substantially as described t - v herein with reference to the accompanying drawings. 12. A rim for supporting a vehicle tire during a curing k operation, substantially as described herein and substantially as shown in the accompanying drawings. \ ^7.$° si A ■ By Jrfls/Their authorised Agents, A. J. PARK & SON Per / 1 -11-