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US3830610A Expired / Lapsed US ⏱️ 0.0 years remaining

Apparatus for forming rubber products such as a tread rubber by extrusion

Assignee: Bridgestone Corp
•
Filing: 1973-10-24
•
Granted: 1974-08-20
•
Expires: 1993-10-24
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Abstract

Abstract An apparatus for forming rubber products such as a tread rubber by extrusion in which rubber is extruded through an extruding die opening which is formed by the lower edge of an upper slidable thin sheet shaped die piece and the upper edge of a lower plate shaped die piece. The upper slidable thin sheet shaped die piece is constructed by laminating a number of sheet units side by side and each sheet unit consists of an elongated thin sheet piece adapted to be moved in a transverse direction and having at its center portion an inclined groove and of a thin sheet die piece arranged perpendicular to said elongated thin sheet piece and provided at its upper end with a latch portion engaged in said inclined groove. The configuration of the extruding die opening is adjusted to a given configuration by moving upwards and downwards each sheet unit consisting of the upper thin sheet shaped die piece. The configuration of the rubber products extruded through the extruding die opening is adjusted by measuring the configuration and then comparing the measured results with a standard configuration. The adjusting operation is automatically effected under an electronic program using a tape or card punched with holes corresponding to die openings which are similar in contour to given extruding die openings and coded into a program.

Inventors

  • 👤 T Mizuno
  • 👤 T Matsumura
  • 👤 S Ohkawa
  • 👤 Y Yatabe

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 19:15
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29C; B29C48/00; B29C48/03; B29C48/12; B29C48/25; B29C48/30; B29C48/305; B29C48/31; B29C48/313; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92114; B29C2948/92123; B29C2948/92133; B29C2948/92152; B29C2948/92314; B29C2948/92504; B29C2948/92609; B29C2948/92819; B29C2948/92857; B29C2948/92904; B29C48/07; B29C48/08; B29L; B29L2030/00; B29L2030/002

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 137 words
An automatic extrusion apparatus for producing tire tread rubbers comprising a plurality of horizontally slidable thin sheets, each of said slidably thin sheets consisting of two sheets of which one sheet is provided with an inclined groove and the other sheet is provided with a notch whose upper edge coincides with the upper edge of said inclined groove, a plurality of vertically slidable thin die pieces each provided at its upper end with a latch piece slidably engaged with said inclined groove, means cooperating with the lower ends of said die pieces to form a die opening, and means for reciprocally moving each of said slidable thin sheets horizontally in the extruding direction so as to move each of said slidable thin die pieces in the vertical direction and thereby adjust the contour of said die opening.
Claim 2
Dependent Claim 137 words
An automatic extrusion apparatus for producing tire tread rubbers comprising a plurality of horizontally slidable thin sheets, each of said slidably thin sheets consisting of two sheets of which one sheet is provided with an inclined groove and the other sheet is provided with a notch whose upper edge coincides with the upper edge of said inclined groove, a plurality of vertically slidable thin die pieces each provided at its upper end with a latch piece slidably engaged with said inclined groove, means cooperating with the lower ends of said die pieces to form a die opening, and means for reciprocally moving each of said slidable thin sheets horizontally in the extruding direction so as to move each of said slidable thin die pieces in the vertical direction and thereby adjust the contour of said die opening.
Claim 3
Dependent Claim 76 words
The apparatus of claim 1 and further comprising automatic control means for forming a die opening having a given configuration, said automatic control means including a card or tape punched with a predetermined program corresponding to the initial configuration of said die opening, means for measuring the dimensions of the rubber product extruded, means for comparing said measured dimensions with the dimension of a standard configuration, and means for re-adjusting the configuration of said die opening.
Claim 4
Dependent Claim 19 words
The apparatus of claim 1 and further comprising automatic control means for adjusting the contour of said die opening.
Claim 5
Dependent Claim 30 words
The apparatus of claim 3 in which said automatic control means includes a card or tape punched with a predetermined program corresponding to the initial contour of said die opening.
Claim 6
Dependent Claim 22 words
The apparatus of claim 4 in which said autOmatic control means comprises means for monitoring the contour of the extruded rubber product.
Claim 7
Dependent Claim 40 words
The apparatus of claim 5 in which said automatic control means comprises means for comparing the monitored contour of said extruded rubber product with a predetermined contour pattern and further comprising means for readjusting the contour of said die opening.
Claim 8
Dependent Claim 38 words
The apparatus of claim 6 in which said monitoring means comprises a contour meter, an analog to digital converter following said contour meter and a pattern memory circuit for storing the output of said analog to digital converter.
Claim 9
Dependent Claim 33 words
The apparatus of claim 6 in which said automatic control means comprises a card or tape punched with said predetermined contour pattern and a pattern memory circuit for storing said predetermined contour pattern.

References Cited (Backward Citations)

US1252821A Cited
US3003245A Cited
US3093860A Cited
US3323169A Cited
US3407441A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-08-19 1978-02-18 1978-08-20 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-08-19 1982-02-18 1982-08-20 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-08-19 1986-02-18 1986-08-20 $7700.00 Window Closed / Lapsed

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