US4220494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire building drum
Assignee: Bridgestone Corp
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Filing: 1978-10-20
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Granted: 1980-09-02
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Expires: 1998-10-20
Abstract
Abstract Herein disclosed is a tire building drum which is constructed expansible in diameter and stretchable in width. The tire building drum comprises in combination: a plurality of base segments circumferentially arranged to define as a whole a cylindrical drum body and adapted to be radially expansible; a pair of side flange means disposed oppositely at axially outer positions of the base segments to be movable along the axial direction of the drum body toward and away from the base segments; and a drum width arranging means for adjusting a drum width measured along the axial direction of the drum body between the side flange means: characterized in that each of the side flange means includes a slide base provided axially movably toward and away from each of the base segments and a side flange axially movably toward and away from the slide base; and that the drum width arranging means includes a pair of screw shafts having oppositely threaded portions which are in threaded engagement with the slide base and the side flange, respectively, for connecting the slide base and side flange, a rotary shaft having axially outer end portions axially slidably received in the screw shafts and rotatable in unison with the screw shafts, and a rotary shaft rotating mechanism provided at the central portion of the rotary shaft to transform a radial rotational force into an axial rotational force for transmitting the same to the rotary shaft; whereby the rotary shaft is rotated by the rotary shaft rotating mechanism to cause the side flange to be axially moved toward and away from the slide bases.
Inventors
- 👤 Sinji Kawaida
- 👤 Yoshihumi Kitayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:11
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/08; B29D30/20; B29D30/24; B29D30/244; B29D30/248
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
288 words
A tire building drum, comprising in combination: a plurality of base segments circumferentially arranged to define as a whole a cylindrical drum body and adapted to be radially expansible; a pair of side flange means disposed oppositely at axially outer positions of said base segments to be movable along the axial direction of the drum body toward and away from said base segments; a synchronized drum width changing means axially moving said side flange means toward and away from each other in synchronism with radial retraction and expansion of said base segments; and a drum width arranging means operated independently of said synchronized drum width changing means for adjusting a drum width measured along the axial direction of the drum body between said side flange means: characterized in that each of said side flange means includes a slide base provided axially movably toward and away from each of said base segments and a side flange axially movably toward and away from said slide base; and that said drum width arranging means includes: a pair of screw shafts having oppositely threaded portions which are in threaded engagement with said slide base and said side flange, respectively, for connecting said slide base and side flange, a rotary shaft having axially outer end portions axially slidably received in said screw shafts and rotatable in unison with said screw shafts, and a rotary shaft rotating mechanism provided at the central portion of said rotary shaft to transform a radial rotational force into an axial rotational force for transmitting the same to said rotary shaft, whereby said rotary shaft is rotated by said rotary shaft rotating mechanism to cause said side flange to be axially moved toward and away from said slide bases.
Claim 2
Dependent Claim
288 words
A tire building drum, comprising in combination: a plurality of base segments circumferentially arranged to define as a whole a cylindrical drum body and adapted to be radially expansible; a pair of side flange means disposed oppositely at axially outer positions of said base segments to be movable along the axial direction of the drum body toward and away from said base segments; a synchronized drum width changing means axially moving said side flange means toward and away from each other in synchronism with radial retraction and expansion of said base segments; and a drum width arranging means operated independently of said synchronized drum width changing means for adjusting a drum width measured along the axial direction of the drum body between said side flange means: characterized in that each of said side flange means includes a slide base provided axially movably toward and away from each of said base segments and a side flange axially movably toward and away from said slide base; and that said drum width arranging means includes: a pair of screw shafts having oppositely threaded portions which are in threaded engagement with said slide base and said side flange, respectively, for connecting said slide base and side flange, a rotary shaft having axially outer end portions axially slidably received in said screw shafts and rotatable in unison with said screw shafts, and a rotary shaft rotating mechanism provided at the central portion of said rotary shaft to transform a radial rotational force into an axial rotational force for transmitting the same to said rotary shaft, whereby said rotary shaft is rotated by said rotary shaft rotating mechanism to cause said side flange to be axially moved toward and away from said slide bases.
Claim 3
Dependent Claim
102 words
A tire building drum as set forth in claim 1, wherein each of said base segments includes a guide member having a groove formed on the radially outer face thereof to axially extend, an attachment block securely mounted on the central portion of said guide member to have an axially extending groove in engagement with said guide member and to rotatably receive said rotary shaft, and a cover plate securely mounted on said attachment block and having both opposite end portions partially covering the radially outer faces of said side flanges to form an arcuate cylindrical surface together with said side flanges.
Claim 4
Dependent Claim
100 words
A tire building drum as set forth in claim 1, wherein a radially inwardly projecting protrusion is formed on the inner face of each of said side flanges and has a threaded bore extending in the axial direction of said drum body to be in threaded engagement with one of said oppositely threaded portions of said screw shaft; and a threaded bore is formed in each of said slide base in axial alignment with said threaded bore of said radially inwardly projecting protrusion to be in threaded engagement with the other of said oppositely threaded portions of said screw shaft.
Claim 5
Dependent Claim
48 words
A tire building drum as set forth in claim 1, wherein a square cross-sectioned bore is formed in each of said screw shafts to extend along its axial direction and to receive a square cross-sectioned portion formed at each of said opposite end portions of said rotary shaft.
Claim 6
Dependent Claim
103 words
A tire building drum as set forth in claim 2, wherein said rotary shaft rotating mechanism includes a first herical gear securely mounted on the longitudinally intermediate portion of said rotary shaft, a second herical gear having a rotational axis perpendicular to the rotational axis of said rotary shaft and in meshing engagement with said first herical gear, and a shaft rotatably received in said attachement block and securely connected with said herical gear in coaxial relation therewith, said shaft having an axially outer end portion formed with a hexagonal cross-sectioned hole and extending within the radially outer surface of said cover plate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |