US4470790A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable extrusion die assembly
Assignee: Bridgestone Corp
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Filing: 1983-01-25
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Granted: 1984-09-11
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Expires: 2003-01-25
Abstract
Abstract An adjustable extrusion die assembly forming part of an extruder for an elastic material, comprises: a stationary die member having an end surface; a plurality of movable die members positioned in side-by-side relationship to one another and slidably contacted with one another, the movable die members respectively having end surfaces opposing to and spaced apart from the end surface of the stationary member, the end surfaces of the stationary and movable die members defining in combination an extrusion opening through which the elastic material is to be extruded, the movable die members being individually movable toward and away from the end surface of the stationary die member with respect to one another so as to vary the distances between the end surface of the stationary die member and the end surfaces of the movable die members; a guide member having formed therein a guide slit having the movable die members guided therein; and a plurality of link members each interconnecting two adjacent movable die members.
Inventors
- 👤 Jumei Harada
- 👤 Takashi Yokoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:23
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29C48/31; B29C48/313; B29C48/03; B29C48/07; B29C48/08; B29C48/12; B29C48/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
199 words
An adjustable extrusion die assembly forming part of an extruder for an elastic material, comprising: a stationary die member having an end surface; a plurality of movable die members positoned in side-by-side relationship to one another and slidably contacted with one another, the movable die members respectively having end surfaces opposing to and spaced apart from the end surface of said stationary member, the end surfaces of said stationary and movable die members defining in combination an extrusion opening through which the elastic material is to be extruded, the movable die members being individually movable toward and away from the end surface of said stationary die member with respect to one another so as to vary the distances between the end surface of said stationary die member and the end surfaces of said movable die members; a guide member having formed therein a guide slit having said movable die members guided therein; and a plurality of link members each positioned on lower end portions of said two adjacent movable die members and each interconnecting two adjacent movable die members, said link members forming part of said extrusion opening whenever said movable die members are not flush with one another.
Claim 2
Dependent Claim
199 words
An adjustable extrusion die assembly forming part of an extruder for an elastic material, comprising: a stationary die member having an end surface; a plurality of movable die members positoned in side-by-side relationship to one another and slidably contacted with one another, the movable die members respectively having end surfaces opposing to and spaced apart from the end surface of said stationary member, the end surfaces of said stationary and movable die members defining in combination an extrusion opening through which the elastic material is to be extruded, the movable die members being individually movable toward and away from the end surface of said stationary die member with respect to one another so as to vary the distances between the end surface of said stationary die member and the end surfaces of said movable die members; a guide member having formed therein a guide slit having said movable die members guided therein; and a plurality of link members each positioned on lower end portions of said two adjacent movable die members and each interconnecting two adjacent movable die members, said link members forming part of said extrusion opening whenever said movable die members are not flush with one another.
Claim 3
Dependent Claim
67 words
An adjustable extrusion die assembly as set forth in claim 1, in which each of said link members has an end surface opposing to the end surface of the stationary die member and flush with the end surface of each of said movable die members under the condition that said two adjacent movable die members are held in positions having the end surfaces flush with each other.
Claim 4
Dependent Claim
54 words
An adjustable extrusion die assembly as set forth in claim 1, in which each of the end portions of said movable die members opposing to the end face of said stationary die member is chamfered at its lateral end portions in the vicinity of the contacting surfaces of said two adjacent movable die members.
Claim 5
Dependent Claim
24 words
An adjustable extrusion die assembly as set forth in claim 1, in which each of said link members is cranked at its intermediate portion.
Claim 6
Dependent Claim
48 words
An adjustable extrusion die assembly as set forth in claim 1, in which each of the link member is formed at its one end portion with a generally circular hole and at its other end portion with a slot extending in the longitudinal direction of the link member.
References Cited (Backward Citations)
US3093860A
Cited
US3195183A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |