CA1074222A - Building drum for tires and cylindrical articles having axially spaced beads - Google Patents
Building drum for tires and cylindrical articles having axially spaced beadsInfo
- Publication number
- CA1074222A CA1074222A CA279,395A CA279395A CA1074222A CA 1074222 A CA1074222 A CA 1074222A CA 279395 A CA279395 A CA 279395A CA 1074222 A CA1074222 A CA 1074222A
- Authority
- CA
- Canada
- Prior art keywords
- axially
- cylindrical
- drum
- radially
- shaft
- 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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- Tyre Moulding (AREA)
- Tires In General (AREA)
Abstract
BUILDING DRUM FOR TIRES AND CYLINDRICAL ARTICLES
HAVING AXIALLY SPACED BEADS
Abstract of the Disclosure A simple low cost building drum, free of axially movable parts for building tires and cylindrical articles having inextensible beads of given diameter therein but spaced axially any selected distance apart, has a single axially and circumferentially continuous radial expandable membrane overlying a thick-walled cylinder of deformable rubbery material the full axial length of which is expandable radially to wrap the membrane against beads placed about the drum and to divide the membrane into a non-inflatable center section and two inflatable end sections each axially outboard of a respective bead.
The thick-walled cylinder is expanded radially by inflating in axially extending cylindrical sleeve within control members in the form of four semi-cylindrical strips which prevent bulging outward of the central portion of the thick-walled cylinder and which engage cylindrical flanges of a pair of end rings spaced along the drum's center shaft.
The foregoing abstract is not to be taken as limiting the invention of this application, and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to the accompanying drawing and the following detailed description.
HAVING AXIALLY SPACED BEADS
Abstract of the Disclosure A simple low cost building drum, free of axially movable parts for building tires and cylindrical articles having inextensible beads of given diameter therein but spaced axially any selected distance apart, has a single axially and circumferentially continuous radial expandable membrane overlying a thick-walled cylinder of deformable rubbery material the full axial length of which is expandable radially to wrap the membrane against beads placed about the drum and to divide the membrane into a non-inflatable center section and two inflatable end sections each axially outboard of a respective bead.
The thick-walled cylinder is expanded radially by inflating in axially extending cylindrical sleeve within control members in the form of four semi-cylindrical strips which prevent bulging outward of the central portion of the thick-walled cylinder and which engage cylindrical flanges of a pair of end rings spaced along the drum's center shaft.
The foregoing abstract is not to be taken as limiting the invention of this application, and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to the accompanying drawing and the following detailed description.
Description
~074ZZZ
The present invention relates to a building drum for tires and cylindrical articles having axially spaced beads.
Broadly, according to one aspect of the invention there is provided a building drum for tires, airsprings, and like articles, independent of the required spacing of bead rings of such articles, and comprising in cooperative combination a center shaft having an air passage opening radially out-wardly therefrom; a pair of rigid end rings mounted on -the shaft and spaced axially thereof farther apart than said bead rings, each end ring having an air passage and a flange projecting axially toward the other end rings; a single radially expansible cylindrical sleeve extending axially of and around the shaft between the end rings radially inwardly of the flanges and forming with the shaft and the end rings an air-retaining chamber in communication with the first said air passage; a plurality of control members extending axially of the shaft between the end rings radially inwardly of the flanges in a circular array about said sleeve and engageable upon expansion of the sleeve with each said flange to control said expansion; a thick-walled cylinder of elastically deformable rubbery material extending axially of the shaft between the flanges and around said control members and capable of partially enveloping a bead ring disposed circumferentially therearound; the outward surfaces of the cylinder and of the end rings cooperating to define a support surface; a pair of cylindrical extensions fixed on and extending axially outwardly from each end ring; and a single axially and circumferentially continuous elastic membrane providing a cylindrical building surface for accommodating a ply thereon and extending around and axially along said support surface to near the respective ends of the extensions and thence axially inwardly along and in cir-` 1~74ZZZ
cumferential contact with the respective extensions, andhaving its ends fixed adjacent the respective end rings, whereby portions of said membrane axially outward of bead rings partially enveloped by the cylinder can be moved axially to turn ply endings about such bead rings.
Certain examples are described herein with reference to the drawing ~orming a part of the present application and in which:
Fig 1 is an axial elevation in cross-section of a drum in accordance with the invention;
Fig 2 is a cross-section view, enlarged, taken as indicated by the line 2-2 in Fig l;
Fig 3 is a partial elevation view of the drum of Fig 1 illustrating the operation thereof.
Referring to the drawing, Fig 1 illustrates in axial cross-section a preferred embodiment of the invention.
The drum 10 in Fig 1 comprises a center shaft 12 formed of a simple cylindrical tube 13. A mounting flange 14 adapted for mounting on a suitable tire building machine spindle 16 is fixed coaxially to one end of the tube.
The spindle, preferably, is provided with dual air passages in the usual manner. The distal end of the tube, that is the end remote from the flange, is closed by a cylindrical plug 18. A passage 20 extending radially , ~
inward between the outer surface of the plug and the central axis 25 of the shaft is connected to an axial passage 28 terminating in a socket 30 which acco~modates the end of a dual air tube 32 containing a central air passage 34 and an annular air passage 36 and which tube extends axially into a corresponding socket 38 provided coaxially in the flange 14. The flange 14 has a similar passage 39 com~unicating with the central passage 3~.
The annual air passage 36 is connected by way of a short tube 40 to a port 42 in the tube wall opening outwardly thereof near the mid-axial plane 45 and provides for air flow between the annular air passage 36 a~d an air chamber 50 later more fully described. Alternatively the tube 32 can be replaced by a single pipe, and the annular space 52 between the pipe and the wall of the tube 13 will serve as the an~ular air passage.
A pair of rigid end rings 60~ 62 are secured rigidly~
coaxially and airtightly on the tube 13 at locations spaced respectively equally from the mid-axial plane.
For purposes described presently~ each end ring has a passage 64 extending between its radially outward surface and its axially outward surface and there connected by a flexible tube 66 to the respective passages 20~ 390 Each end ring has a cylindrical flange 70 extending axially toward the other end ring. The cylindrical outer surface 71 of each flange forms a continuing part of the cylindrical outer surface of the ring. The radially inner surface 72 of the flange is cylindrical and provides a radial stop limiting the radially outward movement of . .
control members presently to be described. The radial faces 7~ of the end rings inwardly of the flanges 70 are smooth planes perpendicular to the axis of the drum.
Surrounding the shaft 12 and extending between the faces 7~ of the end rings is a single radially expansible sleeve 80 of a cured rubber compound and capable of repeated radial expansions and contractions.
Optionally but preferably~ the sleeve is provided at each of its ends w1th sealing lips 81 which bear on the faces 7~ of the respective rings. m e sleeve 80 and the center shaft 12~ t~gether with the lips 81 and end rings 60~62 define the air chamber 50~ previously mentioned~ into which com~ressed air can be introduced by way of the port ~2 and the annular air passage 36 (or the space 52) and from which such air can be exhausted by the same route.
Immediately surrounding the sleeve 80 is a plurality of control members which~ in the present embodiment~ are elongated metal strips 85 having arcuate cross-section which extend between the end rings 60~62 ~erminating close to but not in contact with the radial faces 7~
inwardly of the respective flanges 70~ In the present embodiment~ each of four such strips~ arranged in two pairs~ are in the form of semi-cylindrical members.
m e first or inner pair of members 86~ 87 extend axially of the drum around and in contact with the cylindrical surface of the sleeve 80o me second or outer pair of members 88~89 extend axially between the end rings in surface contact with the outer surface of the inner ~07~ZZZ
members 86,87. m e longitudinal edges of the outer members 88~89 are displaced angularly about the shaft 12 approximately 90 degrees with respect to the longitudinal edges of the inner members 86~87 as will be seen in Fig. 2 ~he four members in the arrangement described are relatively stiff parallel to the drum axis but are sufficiently flexible in directions normal to the axis so that they can expand and contract radially together with the expansion and contraction of the sleeve~ Fig. 1 illustrates the drum with the sleeve in its collapsed radially inward position~ while in Fig 3 there will be seen the control members 85 expanded radially outwardly by the sleeve 80 to bring the end portions of the control members into radially limiting engagement with the cylindrical inner surfaces 72 of the respective flanges.
It will now be apparent~ therefore~ that the sleeve 80 can expand radially uniformly or nearly uniformly with respect to the axis of the drum free of serious or significant bulging in the vicinity of the mid-circumferential plane.
The control members 85 perform two functions.
Firstly~ they restrain the sleeve so as to maintain lts cylindrical shape during its radial expansion in response to inflating air pressure in the chamber 50. Secondly~
they limit the radial expansion of the sleeve to the diameter determined by their abutment against the radially inward cylindrical surfaces 72 of the respective flanges 70.
~0742ZZ
Surrounding the semi-cylindrical strips forming the control members is a thick-walled~ elastically deformable cylinder 90 which extends axially between the flanges. me cylinder 90 is formed of rubber compounds capable of enduring repeated elastic expan-sion and contraction. In the drum 10 the cylinder 90 is formed of an inner generally cylindrical portion 92 having radially outwardly turned ends. This portion is compounded of a rubber-like material and cured to have a greater hardness than the outer portion 9~ which is cylindrical~ is con~ormed to the radially outwardly turned ends of the portion 92~ and is compounded and cured of a relatively softer material.
More specifically~ the first or inner portion 92 15 is formed of a rubber compound cured to have an elastic modulus sufficiently high to hold the thick-walled cylinder firmly concentric with the axis in the collapsed condition and to restore the cylinder to its collapsed condition when in~lating air is exhausted from the chamber 50 The second or outer cylindrical portion 9~ is formed of a relatively soft cured gum rubber or rubber-like compound capable of readily conforming to an inextensible bead ; so as to wrap a ply partially around the bead and to hold such bead so embedded therein against axial dis-placement~ The two portions are cured integrally as a cylinder having plane radial ends disposed closely adjacent to the respective flanges 70 and the inner cylindrical surface of which is carried on the radially outer surfaces of the outer pair 88~89 of control members, Affixed coaxially on each end ring is a cylindrical extension 100 w~ich extends axially outwardly from the respective end ring and provides support for an elastically inflatable membrane 110.
It will be apparent that the building drum in accordance with the invention is extremely simple in construction and is notable in that the drum is completely ~ree of axially movable parts.
The elastic membrane 110 is a tubular cylindrical sleev~ extending circumferentially about and axially along the cylinder 90~ the respective end rings 60~62~
and the cylindrical extensions 100, m e membrane provides a cylindrical building surface for accommodating ply stock thereon and extends axially outwardly about to the axially outer ends of the respective cylindrical extensions and is there folded radially inwardly and extends thence axially inwardly along the respective extension. Its ends 112 are turned radially inwardly between the axially outer face of the respective end ring and the abutting face of the extensio~ being secured in the annular grooves 11~, A building drum in accordance with the invention can be constructed to provide a building surface of any suitable diameter and can without adjustment in any way to the drum be used to build tires ~ airsprings~ and like ---` 1074Z22 articles~ in which inextensible bead rings are disposed at any axial distance from each other. The drum is particularly useful ~or such products as small diameter tires7 airsprings~ rolling lobe diaphragms~ and like annular articles having axially spaced inextensible beads In operation~ a ply or plies of gum liner stock and/or of cord reinforced building stock is or are wrapped circumferentially about the collapsed drum. Inextensible bead rings such as that shown at 120 in Fig~ 3 are then moved axially over the drum and positioned at the required axial spacing~ in which position the beads may be held manually or by any suitable bead locating means (not shown)~ m e simplicity and ease with which con~entional bead locating devices can be adjusted axially in a tire 15 building machine relative to the building drum used therein is too well known to require detailed description here With the respective beads suitably positioned along the axial length of the ply or plies wrapped about the drum and spaced radially outwardly from such plies~
inflation air is admitted to the air chamber 50 at a pressure suf~icient to expand the sleeve 80 and the control members 85 radially of the shaft 12 outwardly to the limit provided by the respective flanges 70. The thick-walled cylinder 90 is thereby expanded concurrently. Upon engage-ment with the bead and the ply thereunder the deformable cylinder 90~ and particularly the so~ter outer portion 94 partially envelops the respective beads and at the same - ~074ZZ2 time forms an air seal isolating the respective end sections A and B of the membrane 110 extending axially outwardly from the beads from the center section C o~
the membrane extending between the beads, Compressed air is then admitted by way of the inner air passage 34 and the passages 64 in the respective end rings, The sections A and B axially outward of the beads then operate in a manner analogous to the ply turnup bladders used in known tire building drums, When inflated~ as illustrated in Fig, 3~ the membrane end sections A and B
can then be urged axially in a conventional manner to complete the folding of the ply endings about the bead, The end sections of the membrane and the chamber 50 are then exhausted and the tire~ or article~ including the beads enfolded in the respective axial ends can be removed axially from the drum for further processing, While certain representative embodiments and details have been shown for the purpose o~ illustrating the invention~ it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit or scope of the invention, _9_ - - - -: - .
The present invention relates to a building drum for tires and cylindrical articles having axially spaced beads.
Broadly, according to one aspect of the invention there is provided a building drum for tires, airsprings, and like articles, independent of the required spacing of bead rings of such articles, and comprising in cooperative combination a center shaft having an air passage opening radially out-wardly therefrom; a pair of rigid end rings mounted on -the shaft and spaced axially thereof farther apart than said bead rings, each end ring having an air passage and a flange projecting axially toward the other end rings; a single radially expansible cylindrical sleeve extending axially of and around the shaft between the end rings radially inwardly of the flanges and forming with the shaft and the end rings an air-retaining chamber in communication with the first said air passage; a plurality of control members extending axially of the shaft between the end rings radially inwardly of the flanges in a circular array about said sleeve and engageable upon expansion of the sleeve with each said flange to control said expansion; a thick-walled cylinder of elastically deformable rubbery material extending axially of the shaft between the flanges and around said control members and capable of partially enveloping a bead ring disposed circumferentially therearound; the outward surfaces of the cylinder and of the end rings cooperating to define a support surface; a pair of cylindrical extensions fixed on and extending axially outwardly from each end ring; and a single axially and circumferentially continuous elastic membrane providing a cylindrical building surface for accommodating a ply thereon and extending around and axially along said support surface to near the respective ends of the extensions and thence axially inwardly along and in cir-` 1~74ZZZ
cumferential contact with the respective extensions, andhaving its ends fixed adjacent the respective end rings, whereby portions of said membrane axially outward of bead rings partially enveloped by the cylinder can be moved axially to turn ply endings about such bead rings.
Certain examples are described herein with reference to the drawing ~orming a part of the present application and in which:
Fig 1 is an axial elevation in cross-section of a drum in accordance with the invention;
Fig 2 is a cross-section view, enlarged, taken as indicated by the line 2-2 in Fig l;
Fig 3 is a partial elevation view of the drum of Fig 1 illustrating the operation thereof.
Referring to the drawing, Fig 1 illustrates in axial cross-section a preferred embodiment of the invention.
The drum 10 in Fig 1 comprises a center shaft 12 formed of a simple cylindrical tube 13. A mounting flange 14 adapted for mounting on a suitable tire building machine spindle 16 is fixed coaxially to one end of the tube.
The spindle, preferably, is provided with dual air passages in the usual manner. The distal end of the tube, that is the end remote from the flange, is closed by a cylindrical plug 18. A passage 20 extending radially , ~
inward between the outer surface of the plug and the central axis 25 of the shaft is connected to an axial passage 28 terminating in a socket 30 which acco~modates the end of a dual air tube 32 containing a central air passage 34 and an annular air passage 36 and which tube extends axially into a corresponding socket 38 provided coaxially in the flange 14. The flange 14 has a similar passage 39 com~unicating with the central passage 3~.
The annual air passage 36 is connected by way of a short tube 40 to a port 42 in the tube wall opening outwardly thereof near the mid-axial plane 45 and provides for air flow between the annular air passage 36 a~d an air chamber 50 later more fully described. Alternatively the tube 32 can be replaced by a single pipe, and the annular space 52 between the pipe and the wall of the tube 13 will serve as the an~ular air passage.
A pair of rigid end rings 60~ 62 are secured rigidly~
coaxially and airtightly on the tube 13 at locations spaced respectively equally from the mid-axial plane.
For purposes described presently~ each end ring has a passage 64 extending between its radially outward surface and its axially outward surface and there connected by a flexible tube 66 to the respective passages 20~ 390 Each end ring has a cylindrical flange 70 extending axially toward the other end ring. The cylindrical outer surface 71 of each flange forms a continuing part of the cylindrical outer surface of the ring. The radially inner surface 72 of the flange is cylindrical and provides a radial stop limiting the radially outward movement of . .
control members presently to be described. The radial faces 7~ of the end rings inwardly of the flanges 70 are smooth planes perpendicular to the axis of the drum.
Surrounding the shaft 12 and extending between the faces 7~ of the end rings is a single radially expansible sleeve 80 of a cured rubber compound and capable of repeated radial expansions and contractions.
Optionally but preferably~ the sleeve is provided at each of its ends w1th sealing lips 81 which bear on the faces 7~ of the respective rings. m e sleeve 80 and the center shaft 12~ t~gether with the lips 81 and end rings 60~62 define the air chamber 50~ previously mentioned~ into which com~ressed air can be introduced by way of the port ~2 and the annular air passage 36 (or the space 52) and from which such air can be exhausted by the same route.
Immediately surrounding the sleeve 80 is a plurality of control members which~ in the present embodiment~ are elongated metal strips 85 having arcuate cross-section which extend between the end rings 60~62 ~erminating close to but not in contact with the radial faces 7~
inwardly of the respective flanges 70~ In the present embodiment~ each of four such strips~ arranged in two pairs~ are in the form of semi-cylindrical members.
m e first or inner pair of members 86~ 87 extend axially of the drum around and in contact with the cylindrical surface of the sleeve 80o me second or outer pair of members 88~89 extend axially between the end rings in surface contact with the outer surface of the inner ~07~ZZZ
members 86,87. m e longitudinal edges of the outer members 88~89 are displaced angularly about the shaft 12 approximately 90 degrees with respect to the longitudinal edges of the inner members 86~87 as will be seen in Fig. 2 ~he four members in the arrangement described are relatively stiff parallel to the drum axis but are sufficiently flexible in directions normal to the axis so that they can expand and contract radially together with the expansion and contraction of the sleeve~ Fig. 1 illustrates the drum with the sleeve in its collapsed radially inward position~ while in Fig 3 there will be seen the control members 85 expanded radially outwardly by the sleeve 80 to bring the end portions of the control members into radially limiting engagement with the cylindrical inner surfaces 72 of the respective flanges.
It will now be apparent~ therefore~ that the sleeve 80 can expand radially uniformly or nearly uniformly with respect to the axis of the drum free of serious or significant bulging in the vicinity of the mid-circumferential plane.
The control members 85 perform two functions.
Firstly~ they restrain the sleeve so as to maintain lts cylindrical shape during its radial expansion in response to inflating air pressure in the chamber 50. Secondly~
they limit the radial expansion of the sleeve to the diameter determined by their abutment against the radially inward cylindrical surfaces 72 of the respective flanges 70.
~0742ZZ
Surrounding the semi-cylindrical strips forming the control members is a thick-walled~ elastically deformable cylinder 90 which extends axially between the flanges. me cylinder 90 is formed of rubber compounds capable of enduring repeated elastic expan-sion and contraction. In the drum 10 the cylinder 90 is formed of an inner generally cylindrical portion 92 having radially outwardly turned ends. This portion is compounded of a rubber-like material and cured to have a greater hardness than the outer portion 9~ which is cylindrical~ is con~ormed to the radially outwardly turned ends of the portion 92~ and is compounded and cured of a relatively softer material.
More specifically~ the first or inner portion 92 15 is formed of a rubber compound cured to have an elastic modulus sufficiently high to hold the thick-walled cylinder firmly concentric with the axis in the collapsed condition and to restore the cylinder to its collapsed condition when in~lating air is exhausted from the chamber 50 The second or outer cylindrical portion 9~ is formed of a relatively soft cured gum rubber or rubber-like compound capable of readily conforming to an inextensible bead ; so as to wrap a ply partially around the bead and to hold such bead so embedded therein against axial dis-placement~ The two portions are cured integrally as a cylinder having plane radial ends disposed closely adjacent to the respective flanges 70 and the inner cylindrical surface of which is carried on the radially outer surfaces of the outer pair 88~89 of control members, Affixed coaxially on each end ring is a cylindrical extension 100 w~ich extends axially outwardly from the respective end ring and provides support for an elastically inflatable membrane 110.
It will be apparent that the building drum in accordance with the invention is extremely simple in construction and is notable in that the drum is completely ~ree of axially movable parts.
The elastic membrane 110 is a tubular cylindrical sleev~ extending circumferentially about and axially along the cylinder 90~ the respective end rings 60~62~
and the cylindrical extensions 100, m e membrane provides a cylindrical building surface for accommodating ply stock thereon and extends axially outwardly about to the axially outer ends of the respective cylindrical extensions and is there folded radially inwardly and extends thence axially inwardly along the respective extension. Its ends 112 are turned radially inwardly between the axially outer face of the respective end ring and the abutting face of the extensio~ being secured in the annular grooves 11~, A building drum in accordance with the invention can be constructed to provide a building surface of any suitable diameter and can without adjustment in any way to the drum be used to build tires ~ airsprings~ and like ---` 1074Z22 articles~ in which inextensible bead rings are disposed at any axial distance from each other. The drum is particularly useful ~or such products as small diameter tires7 airsprings~ rolling lobe diaphragms~ and like annular articles having axially spaced inextensible beads In operation~ a ply or plies of gum liner stock and/or of cord reinforced building stock is or are wrapped circumferentially about the collapsed drum. Inextensible bead rings such as that shown at 120 in Fig~ 3 are then moved axially over the drum and positioned at the required axial spacing~ in which position the beads may be held manually or by any suitable bead locating means (not shown)~ m e simplicity and ease with which con~entional bead locating devices can be adjusted axially in a tire 15 building machine relative to the building drum used therein is too well known to require detailed description here With the respective beads suitably positioned along the axial length of the ply or plies wrapped about the drum and spaced radially outwardly from such plies~
inflation air is admitted to the air chamber 50 at a pressure suf~icient to expand the sleeve 80 and the control members 85 radially of the shaft 12 outwardly to the limit provided by the respective flanges 70. The thick-walled cylinder 90 is thereby expanded concurrently. Upon engage-ment with the bead and the ply thereunder the deformable cylinder 90~ and particularly the so~ter outer portion 94 partially envelops the respective beads and at the same - ~074ZZ2 time forms an air seal isolating the respective end sections A and B of the membrane 110 extending axially outwardly from the beads from the center section C o~
the membrane extending between the beads, Compressed air is then admitted by way of the inner air passage 34 and the passages 64 in the respective end rings, The sections A and B axially outward of the beads then operate in a manner analogous to the ply turnup bladders used in known tire building drums, When inflated~ as illustrated in Fig, 3~ the membrane end sections A and B
can then be urged axially in a conventional manner to complete the folding of the ply endings about the bead, The end sections of the membrane and the chamber 50 are then exhausted and the tire~ or article~ including the beads enfolded in the respective axial ends can be removed axially from the drum for further processing, While certain representative embodiments and details have been shown for the purpose o~ illustrating the invention~ it will be apparent to those skilled in the art that various changes and modifications may be made therein without departing from the spirit or scope of the invention, _9_ - - - -: - .
Claims (5)
1. A building drum for tires, airsprings, and like articles, independent of the required spacing of bead rings of such articles, and comprising in cooperative combination a center shaft having an air passage opening radially outwardly therefrom;
a pair of rigid end rings mounted on the shaft and spaced axially thereof farther apart than said bead rings, each end ring having an air passage and a flange projecting axially toward the other end rings;
a single radially expansible cylindrical sleeve extending axially of and around the shaft between the end rings radially inwardly of the flanges and forming with the shaft and the end rings an air-retaining chamber in communication with the first said air passage;
a plurality of control members extending axially of the shaft between the end rings radially inwardly of the flanges in a circular array about said sleeve and engageable upon expansion of the sleeve with each said flange to control said expansion;
a thick-walled cylinder of elastically deformable rubbery material extending axially of the shaft between the flanges and around said control members and capable of partially enveloping a bead ring disposed circumferentially therearound;
the outward surfaces of the cylinder and of the end rings cooperating to define a support surface;
a pair of cylindrical extensions fixed on and extending axially outwardly from each end ring; and a single axially and circumferentially continuous elastic membrane providing a cylindrical building surface for accommodating a ply thereon and extending around and axially along said support surface to near the respective ends of the extensions and thence axially inwardly along and in circumferential contact with the respective exten-sions, and having its ends fixed adjacent the respective end rings, whereby portions of said membrane axially outward of bead rings partially enveloped by the cylinder can be moved axially to turn ply endings about such bead rings.
a pair of rigid end rings mounted on the shaft and spaced axially thereof farther apart than said bead rings, each end ring having an air passage and a flange projecting axially toward the other end rings;
a single radially expansible cylindrical sleeve extending axially of and around the shaft between the end rings radially inwardly of the flanges and forming with the shaft and the end rings an air-retaining chamber in communication with the first said air passage;
a plurality of control members extending axially of the shaft between the end rings radially inwardly of the flanges in a circular array about said sleeve and engageable upon expansion of the sleeve with each said flange to control said expansion;
a thick-walled cylinder of elastically deformable rubbery material extending axially of the shaft between the flanges and around said control members and capable of partially enveloping a bead ring disposed circumferentially therearound;
the outward surfaces of the cylinder and of the end rings cooperating to define a support surface;
a pair of cylindrical extensions fixed on and extending axially outwardly from each end ring; and a single axially and circumferentially continuous elastic membrane providing a cylindrical building surface for accommodating a ply thereon and extending around and axially along said support surface to near the respective ends of the extensions and thence axially inwardly along and in circumferential contact with the respective exten-sions, and having its ends fixed adjacent the respective end rings, whereby portions of said membrane axially outward of bead rings partially enveloped by the cylinder can be moved axially to turn ply endings about such bead rings.
2. A building drum as claimed in Claim 1, wherein each control member comprises a metal strip having an arcuate cross-section.
3. A building drum as claimed in Claim 2, wherein said plurality of control members comprises four semi-cylinders and wherein one pair of semi-cylinders are displaced angularly about the shaft with respect to the other pair thereof.
4. A building drum as claimed in Claim 1, said drum being free of axially movable parts.
5. A building drum as claimed in Claim 4, wherein said thick-walled cylinder comprises a radially inner portion and a radially outer portion, the outer portion being of sorter material than the inner portion, and wherein said thick-walled cylinder is axially longer than the axial space between the beads of said tire or like article.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA279,395A CA1074222A (en) | 1977-05-30 | 1977-05-30 | Building drum for tires and cylindrical articles having axially spaced beads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA279,395A CA1074222A (en) | 1977-05-30 | 1977-05-30 | Building drum for tires and cylindrical articles having axially spaced beads |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1074222A true CA1074222A (en) | 1980-03-25 |
Family
ID=4108756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA279,395A Expired CA1074222A (en) | 1977-05-30 | 1977-05-30 | Building drum for tires and cylindrical articles having axially spaced beads |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1074222A (en) |
-
1977
- 1977-05-30 CA CA279,395A patent/CA1074222A/en not_active Expired
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|---|---|---|---|
| MKEX | Expiry |