CA1102060A - Core apparatus - Google Patents
Core apparatusInfo
- Publication number
- CA1102060A CA1102060A CA295,407A CA295407A CA1102060A CA 1102060 A CA1102060 A CA 1102060A CA 295407 A CA295407 A CA 295407A CA 1102060 A CA1102060 A CA 1102060A
- Authority
- CA
- Canada
- Prior art keywords
- core
- annular
- axial end
- roll
- core portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229920001971 elastomer Polymers 0.000 claims abstract description 5
- 239000000806 elastomer Substances 0.000 claims abstract description 4
- 239000004576 sand Substances 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000011065 in-situ storage Methods 0.000 claims 1
- 239000011162 core material Substances 0.000 description 39
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 14
- 239000013536 elastomeric material Substances 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D30/00—Producing pneumatic or solid tyres or parts thereof
- B29D30/06—Pneumatic tyres or parts thereof (e.g. produced by casting, moulding, compression moulding, injection moulding, centrifugal casting)
- B29D30/48—Bead-rings or bead-cores; Treatment thereof prior to building the tyre
- B29D2030/482—Applying fillers or apexes to bead cores
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Laminated Bodies (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Tires In General (AREA)
- Tyre Moulding (AREA)
Abstract
CORE APPARATUS
Abstract of the Disclosure An annular member is integrally positioned within a core portion so that a side surface of the annular portion coacts with the outer surface of the core portion to form a substantially smooth and continuous outer surface of a core. A substantially inextensible portion of the annular member is joined in end-to-end relation to an elastomer portion of the annular member. An axial end portion of the elastomer portion is mechanically locked to the core portion.
Abstract of the Disclosure An annular member is integrally positioned within a core portion so that a side surface of the annular portion coacts with the outer surface of the core portion to form a substantially smooth and continuous outer surface of a core. A substantially inextensible portion of the annular member is joined in end-to-end relation to an elastomer portion of the annular member. An axial end portion of the elastomer portion is mechanically locked to the core portion.
Description
~la~60 Background of the Invention ~
This invention relates to a core, and more partic-ularly to a portion of a core used in the formation of, for example, a tire.
U.S. Patent No. 3,883,287 to Grawey et al. issued May 13, 1975 (assigned to the assignee of this invention), discloses apparatus including a rigid mold body and an ex-pandable bladder associated therewith, the bladder being inflatable and expandable to form and press a core between itself and the mold body. Such core is made up of sand core material and an annular substantialIy inextensible roll-restraining hoop. The roll-restraini~ng hoop as disclosed in that patent defines in cross-section a rounded upper end.
In the final core as formed, a side surface of the roll-restraining hoop defines a portion of the outer surface of the core.
In general, the roll-restraining hoop of the type disclosed in that patent is made up of a first elastomeric annular part having substantially inextensible wires embedded therein, and a second annular part of elastomeric material secured to the first part. The elastomeric material making up the separate roll-restraining hoop portions are uncured and are ~oined together as a unit to form the overall roll-restraining hoop. The hoop is then located within the upper portion of the mold, as described in that patent.
As is well known, all rubber materials, whether cured or uncured, tend to assume an original form when re-leased from an applied stress. In the presently used system as disclosed in that patent, a great degree of care must be exercised in the operation joining the roll-restraining hoop sections, to provide
This invention relates to a core, and more partic-ularly to a portion of a core used in the formation of, for example, a tire.
U.S. Patent No. 3,883,287 to Grawey et al. issued May 13, 1975 (assigned to the assignee of this invention), discloses apparatus including a rigid mold body and an ex-pandable bladder associated therewith, the bladder being inflatable and expandable to form and press a core between itself and the mold body. Such core is made up of sand core material and an annular substantialIy inextensible roll-restraining hoop. The roll-restraini~ng hoop as disclosed in that patent defines in cross-section a rounded upper end.
In the final core as formed, a side surface of the roll-restraining hoop defines a portion of the outer surface of the core.
In general, the roll-restraining hoop of the type disclosed in that patent is made up of a first elastomeric annular part having substantially inextensible wires embedded therein, and a second annular part of elastomeric material secured to the first part. The elastomeric material making up the separate roll-restraining hoop portions are uncured and are ~oined together as a unit to form the overall roll-restraining hoop. The hoop is then located within the upper portion of the mold, as described in that patent.
As is well known, all rubber materials, whether cured or uncured, tend to assume an original form when re-leased from an applied stress. In the presently used system as disclosed in that patent, a great degree of care must be exercised in the operation joining the roll-restraining hoop sections, to provide
- 2 -proper relative positioning of those portions. This is extremely important since one side of the roll-restraining hoop defines a portion of the outer surface of the core, and i~ is of great interest that this outer surface of the core be smooth and continuous throughout. Reference will be made herein to particular problems which may result in the above system. According to the present invention, there is provided an annular core comprising a core portion formed of sand and hinder and having an outer surface;
an annular member having a side surface and being integrally positioned within said core portion, said side surface and said outer surface of said core portion being positioned relative to one another to define a smooth and continuous outer surface of said core, said annular member including an inextensible first annular portion and a second annular portion constructed from an elastomer material and having first and second axial ends, said first annular portion being 20 positioned at and joined to the first axial end of the second annular portion in a manner causing the second axial end of said second annular portion to be biased in a direction away from said core portion; said second annular portion having a depression in the second axial 25 end thereof; and said core portion having a projection extending into the depression -to position the second axial end relative to the outer surface of the core .~
,~
" 110~060 portion and to hold the second axial end relative to the core portion against the bias causing the second axial end to be biased in the direction away from said core portion.
These and other objects of the invention will become apparent from a study of the following specification and drawings in which:
FIG. 1 is a sectional view of a portion of an overall core forming apparatus.
FIG. 2 is an enlarged view of the area II-II
of FIG. 1.
FIGS. 3 and 4 are sectional views of the core formed by the apparatus of FIGS 1 and 2, utilizing conventionally formed roll-restraining hoops; and FIGS. 5 and ~ show first and second embodiments of particular roll-restraining hoops which are the subject of this invention.
Shown in FIG. 2, and in accordance with U.S.
Patent No. 3,883,287, cited above, an annular 20 roll-restraining hoop lO is supported by extendable and retractable fingers 12 of plungers 1102~60 14 within the mold body 16 in close proximity thereto, The conventional roll-restraining hoop 10 is made up of a first annular member portion 18 of elastomeric material having wires 20 embedded therein, and a second elastomeric annular portion 22 secured thereto. It is to be seen that the roll-restraining hoop 10 defines in cross-section an end 24 of generally rounded configuration. As set forth above, in the joining of the roll-restraining hoop portions 18,22 it is possible that the end 24 of the portion 22 is caused to locate more to the left with respect to a vertical line in FIG. 1 than is desired. This results in a condition where-in, subsequent to the support of the roll-restraining hoop 10 by the fingers 14, but prior to the introduction of a mixture of sand and silica binder 26, the end 24 naturally adopts the position shown in FIG. 3. Upon introduction of sand and silica binder 26 into the area described above, and upon formation of the core 28, the overall core 28 will adopt the configuration shown in FIG . 3. It will be seen that the outer surface 30 thereof is not smooth and continuous in configuation as is desired for the formation of a tube-tire on such outer surface.
Similarly, if the joining operation of the portions 18', 22' causes the portion 22 to be biased to the right as shown in FIG. 4, upon removal of the core 28' from the apparatus, the portion 22' will adopt the position shown in FIG. 4, again providing a discontinuous outer surface 30' of the core 28'. In either the case of FIG. 3 or FIG. 4, it will be seen that a certain amount of re-working of the core 28,28' is necessary to indeed provide the desired outer surface of that core.
Referring to FIG. 5, it will be seen again that the ll(~Z060 core 32 is made up of a core portion 34 and an annular member 36, generally as described above. In such apparatus, the annular roll-restraining hoop member 36 is made up of a first annular member portion 38 of elastomeric material having wires 40 embedded therein, and a second elastomeric annular member portion 42 secured thereto. First portion 38 is substantially inextensible so that the overall annular member is substantially inextensible. As shown in the cross-section of the roll-restraining hoop, the second annular member portion defines in cross-section a depression 44, the end 46 actually being dove-tailed in configuration.
In the use of such roll-restraining hoop 36, it is positioned~in ~the same manner as ~he one previously described, and then sand and silica binder is introduced in accordance with the above. The dove-tailed end 46 provides surfaces 48,50 which co-act with the core portion 34 formed of sand and silica binder, to provide positive and effective location of that end 46 relative to the core portion 34, so that the core portion 34 and the core portion made up of the roll-restraining hoop 36 together define a core 32 having a smoothouter surface 52 with a side surface 54 of the roll-restraining hoop 36 making up a portion of that outer surface 52 of the core 32.
In FIG. 6 is shown another embodiment of roll-restraining hoop 60 in accordance with the present invention.
As shown therein, the roll-restraining hoop 60 is made up of an annular member portion 62 of elastomeric material having wires 64 embedded therein, and a second annular member portion 66 of elastomeric material, the wires 64 rendering the overall roll-restraining hoop 60 to be substantially inextensible.
In this embodiment, the end 68 defined by the roll-restraining 11(3'~060 hoop 60 in cross-section is generally stepped in configuration, with the depression 70 thereof being located in the end product closer to the outer surface 76 than the inner surface of the core 72.
Again, it will be seen that the roll-restraining hoop 60 is positioned in accordance with the FIG. 1 and 2 disclosure, and the particular configuration of the end 68 results in positive and effective location and holding of that end 68 in relation to the core portion 74 so that the overall core 72 formed defines a smooth outer surface 76 with a side surface 78 of the roll-restraining hoop 60 making up a portion of that outer surface 76 of the core 72.
an annular member having a side surface and being integrally positioned within said core portion, said side surface and said outer surface of said core portion being positioned relative to one another to define a smooth and continuous outer surface of said core, said annular member including an inextensible first annular portion and a second annular portion constructed from an elastomer material and having first and second axial ends, said first annular portion being 20 positioned at and joined to the first axial end of the second annular portion in a manner causing the second axial end of said second annular portion to be biased in a direction away from said core portion; said second annular portion having a depression in the second axial 25 end thereof; and said core portion having a projection extending into the depression -to position the second axial end relative to the outer surface of the core .~
,~
" 110~060 portion and to hold the second axial end relative to the core portion against the bias causing the second axial end to be biased in the direction away from said core portion.
These and other objects of the invention will become apparent from a study of the following specification and drawings in which:
FIG. 1 is a sectional view of a portion of an overall core forming apparatus.
FIG. 2 is an enlarged view of the area II-II
of FIG. 1.
FIGS. 3 and 4 are sectional views of the core formed by the apparatus of FIGS 1 and 2, utilizing conventionally formed roll-restraining hoops; and FIGS. 5 and ~ show first and second embodiments of particular roll-restraining hoops which are the subject of this invention.
Shown in FIG. 2, and in accordance with U.S.
Patent No. 3,883,287, cited above, an annular 20 roll-restraining hoop lO is supported by extendable and retractable fingers 12 of plungers 1102~60 14 within the mold body 16 in close proximity thereto, The conventional roll-restraining hoop 10 is made up of a first annular member portion 18 of elastomeric material having wires 20 embedded therein, and a second elastomeric annular portion 22 secured thereto. It is to be seen that the roll-restraining hoop 10 defines in cross-section an end 24 of generally rounded configuration. As set forth above, in the joining of the roll-restraining hoop portions 18,22 it is possible that the end 24 of the portion 22 is caused to locate more to the left with respect to a vertical line in FIG. 1 than is desired. This results in a condition where-in, subsequent to the support of the roll-restraining hoop 10 by the fingers 14, but prior to the introduction of a mixture of sand and silica binder 26, the end 24 naturally adopts the position shown in FIG. 3. Upon introduction of sand and silica binder 26 into the area described above, and upon formation of the core 28, the overall core 28 will adopt the configuration shown in FIG . 3. It will be seen that the outer surface 30 thereof is not smooth and continuous in configuation as is desired for the formation of a tube-tire on such outer surface.
Similarly, if the joining operation of the portions 18', 22' causes the portion 22 to be biased to the right as shown in FIG. 4, upon removal of the core 28' from the apparatus, the portion 22' will adopt the position shown in FIG. 4, again providing a discontinuous outer surface 30' of the core 28'. In either the case of FIG. 3 or FIG. 4, it will be seen that a certain amount of re-working of the core 28,28' is necessary to indeed provide the desired outer surface of that core.
Referring to FIG. 5, it will be seen again that the ll(~Z060 core 32 is made up of a core portion 34 and an annular member 36, generally as described above. In such apparatus, the annular roll-restraining hoop member 36 is made up of a first annular member portion 38 of elastomeric material having wires 40 embedded therein, and a second elastomeric annular member portion 42 secured thereto. First portion 38 is substantially inextensible so that the overall annular member is substantially inextensible. As shown in the cross-section of the roll-restraining hoop, the second annular member portion defines in cross-section a depression 44, the end 46 actually being dove-tailed in configuration.
In the use of such roll-restraining hoop 36, it is positioned~in ~the same manner as ~he one previously described, and then sand and silica binder is introduced in accordance with the above. The dove-tailed end 46 provides surfaces 48,50 which co-act with the core portion 34 formed of sand and silica binder, to provide positive and effective location of that end 46 relative to the core portion 34, so that the core portion 34 and the core portion made up of the roll-restraining hoop 36 together define a core 32 having a smoothouter surface 52 with a side surface 54 of the roll-restraining hoop 36 making up a portion of that outer surface 52 of the core 32.
In FIG. 6 is shown another embodiment of roll-restraining hoop 60 in accordance with the present invention.
As shown therein, the roll-restraining hoop 60 is made up of an annular member portion 62 of elastomeric material having wires 64 embedded therein, and a second annular member portion 66 of elastomeric material, the wires 64 rendering the overall roll-restraining hoop 60 to be substantially inextensible.
In this embodiment, the end 68 defined by the roll-restraining 11(3'~060 hoop 60 in cross-section is generally stepped in configuration, with the depression 70 thereof being located in the end product closer to the outer surface 76 than the inner surface of the core 72.
Again, it will be seen that the roll-restraining hoop 60 is positioned in accordance with the FIG. 1 and 2 disclosure, and the particular configuration of the end 68 results in positive and effective location and holding of that end 68 in relation to the core portion 74 so that the overall core 72 formed defines a smooth outer surface 76 with a side surface 78 of the roll-restraining hoop 60 making up a portion of that outer surface 76 of the core 72.
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An annular core comprising:
a core portion formed of sand and binder and having an outer surface;
an annular member having a side surface and being integrally positioned within said core portion, said side surface and said outer surface of said core portion being positioned relative to one another to define a smooth and continuous outer surface of said core, said annular member including an inextensible first annular portion and a second annular portion constructed from an elastomer material and having first and second axial ends, said first annular portion being positioned at and joined to the first axial end of the second annular portion in a manner causing the second axial end of said second annular portion to be biased in a direction away from said core portion;
said second annular portion having a depression in the second axial end thereof; and said core portion having a projection extending into the depression to position the second axial end relative to the outer surface of the core portion and to hold the second axial end relative to the core portion against the bias causing the second axial end to be biased in the direction away from said core portion.
a core portion formed of sand and binder and having an outer surface;
an annular member having a side surface and being integrally positioned within said core portion, said side surface and said outer surface of said core portion being positioned relative to one another to define a smooth and continuous outer surface of said core, said annular member including an inextensible first annular portion and a second annular portion constructed from an elastomer material and having first and second axial ends, said first annular portion being positioned at and joined to the first axial end of the second annular portion in a manner causing the second axial end of said second annular portion to be biased in a direction away from said core portion;
said second annular portion having a depression in the second axial end thereof; and said core portion having a projection extending into the depression to position the second axial end relative to the outer surface of the core portion and to hold the second axial end relative to the core portion against the bias causing the second axial end to be biased in the direction away from said core portion.
2. The annular core of claim 1 wherein said projection of said core portion is formed in situ with the depression in the second axial end.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US78886077A | 1977-04-19 | 1977-04-19 | |
| US788,860 | 1977-04-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1102060A true CA1102060A (en) | 1981-06-02 |
Family
ID=25145806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA295,407A Expired CA1102060A (en) | 1977-04-19 | 1978-01-20 | Core apparatus |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS53129269A (en) |
| CA (1) | CA1102060A (en) |
| FR (1) | FR2387761A1 (en) |
| GB (1) | GB1573358A (en) |
| IT (1) | IT1093460B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2985938A (en) * | 1958-04-15 | 1961-05-30 | James A Rappas | Molding with a flexible chamfer strip |
| US3552480A (en) * | 1968-07-12 | 1971-01-05 | Caterpillar Tractor Co | Pattern for making a sand mold with a back draft |
| US3883287A (en) * | 1973-06-15 | 1975-05-13 | Caterpillar Tractor Co | Pneumatic core press |
-
1977
- 1977-12-16 GB GB52458/77A patent/GB1573358A/en not_active Expired
-
1978
- 1978-01-20 CA CA295,407A patent/CA1102060A/en not_active Expired
- 1978-02-07 JP JP1202778A patent/JPS53129269A/en active Pending
- 1978-02-09 FR FR7803676A patent/FR2387761A1/en active Granted
- 1978-04-04 IT IT21949/78A patent/IT1093460B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| FR2387761B1 (en) | 1983-04-08 |
| FR2387761A1 (en) | 1978-11-17 |
| IT7821949A0 (en) | 1978-04-04 |
| JPS53129269A (en) | 1978-11-11 |
| IT1093460B (en) | 1985-07-19 |
| GB1573358A (en) | 1980-08-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |