US3757558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for necking-in tubular members
Assignee: Primerica Inc
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Filing: 1973-01-16
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Granted: 1973-09-11
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Expires: 1993-01-16
Abstract
Abstract Method and die assembly for necking-in tubular members wherein the die assembly comprises an outer reducing die and an inner die pilot comprised of a T-shaped holder on which is mounted a pilot ring that floats radially on an also mounted spring biased axially floating retaining ring means. The reducing die has a recessed inwardly angled directing surface on the wall of its inner chamber, and the pilot ring has a wide diameter circumferential step surface and two supporting surfaces of lesser diameter. A clearance is provided between the pilot ring supporting surfaces and the outer reducing die. The outer reducing die is brought into telescoping engagement with the marginal edge portion of the wall of a tubular member. This causes the reducing die directing surface to direct the marginal edge portion inwardly against the pilot ring step whereby the edge portion is directed into a groove formed by the pilot ring, the outer reducing die and a control surface which transversely engages the edge of the wall and controls its axial movement in relation to the die assembly. In the groove, the marginal edge portion is formed into a rim of reduced diameter. As the outer reducing die continues to move axially over the tubular wall, the directing surface directs the flow of tubular wall material into the aforementioned clearance and toward the lesser diameter pilot ring surfaces against and along which it rests to form a neck having a diameter less than that of the rim. The method and die assembly accomodates can bodies having side seams and utilizes a spring means to compensate for irregularities in and for changes in wall length which occur during the necking-in operation.
Inventors
- 👤 C Heinle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:08
CPC Classifications
B; B21; B21D; B21D41/00; B21D41/04; B21D51/00; B21D51/16; B21D51/26; B21D51/2615; B21D51/2638
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
364 words
A die assembly for necking-in an end portion of a tubular member comprising: an outer reducing die having a recessed inwardly angled directing surface, and a rim-forming surface adjoining and interior of said forming surface, a die interior of and telescoped within said reducing die, a pilot ring mounted on said pilot and having an upper circumferential step of greater diameter than the rest of said pilot ring, an axially moveable retaining ring means contiguous to said pilot ring for retaining said pilot ring in position on said pilot, said retaining ring means including a control surface adjacent to and protruding slightly beyond said pilot step, said control surface being for transversely engaging the edge of and essentially stopping the movement of a tubular member brought thereagainst, spring means contiguous with said retaining ring means and providing biasing pressure against said retaining ring means, spring support means contiguous with said spring means for rigidly supporting said spring means, mounting means for mounting said die pilot, pilot ring, retaining ring means, spring means and spring support means thereon and for carrying said pilot and each of said means axially in and out of said reducing die, means for independently advancing and retracting said reducing die and said pilot such that they cooperate and that said directing surface and the marginal edge portion of said tubular member are movingly engaged before said pilot is fully positioned within an open end of said tubular member, said directing surface directs said marginal edge portion inwardly against said pilot step, a portion of said marginal edge portion is brought into abutting engagement with at least a portion of a groove formed by said control surface, said retaining ring means and said pilot step to thereby form a rim of a reduced diameter out of said marginal edge portion, and said directing surface is moved axially and engagingly through and along wall portions of said tubular member to progressively direct said wall portions inwardly against the rest of said pilot without engaging said rim-forming surface with said inwardly-directed wall portions, to thereby form a neck in said tubular member, said neck having a diameter less than that of said rim.
Claim 2
Dependent Claim
364 words
A die assembly for necking-in an end portion of a tubular member comprising: an outer reducing die having a recessed inwardly angled directing surface, and a rim-forming surface adjoining and interior of said forming surface, a die interior of and telescoped within said reducing die, a pilot ring mounted on said pilot and having an upper circumferential step of greater diameter than the rest of said pilot ring, an axially moveable retaining ring means contiguous to said pilot ring for retaining said pilot ring in position on said pilot, said retaining ring means including a control surface adjacent to and protruding slightly beyond said pilot step, said control surface being for transversely engaging the edge of and essentially stopping the movement of a tubular member brought thereagainst, spring means contiguous with said retaining ring means and providing biasing pressure against said retaining ring means, spring support means contiguous with said spring means for rigidly supporting said spring means, mounting means for mounting said die pilot, pilot ring, retaining ring means, spring means and spring support means thereon and for carrying said pilot and each of said means axially in and out of said reducing die, means for independently advancing and retracting said reducing die and said pilot such that they cooperate and that said directing surface and the marginal edge portion of said tubular member are movingly engaged before said pilot is fully positioned within an open end of said tubular member, said directing surface directs said marginal edge portion inwardly against said pilot step, a portion of said marginal edge portion is brought into abutting engagement with at least a portion of a groove formed by said control surface, said retaining ring means and said pilot step to thereby form a rim of a reduced diameter out of said marginal edge portion, and said directing surface is moved axially and engagingly through and along wall portions of said tubular member to progressively direct said wall portions inwardly against the rest of said pilot without engaging said rim-forming surface with said inwardly-directed wall portions, to thereby form a neck in said tubular member, said neck having a diameter less than that of said rim.
Claim 3
Dependent Claim
31 words
The die assembly of claim 1 wherein there is also included retaining ring control means engaging said retaining ring means, for preventing inward axial movement thereof beyond a certain preset distance.
Claim 4
Dependent Claim
34 words
The die assembly of claim 1 wherein said pilot ring floats radially in relation to said retaining ring means to compensate for an extra thickness in the marginal edge portion of said tubular member.
Claim 5
Dependent Claim
34 words
The die assembly of claim 2 wherein said pilot ring floats radially in relation to said retaining ring means to compensate for an extra thickness in the marginal edge portion of said tubular member.
Claim 6
Dependent Claim
72 words
The die assembly of claim 4 wherein said retaining ring means includes a control ring having Said control surface thereon and being in abutting engagement with said retaining ring means and said pilot ring, and means tied to said retaining ring means for adjustably holding said control ring in place and for maintaining a gap between said control ring and said pilot ring which will allow said pilot ring to float radially.
Claim 7
Dependent Claim
72 words
The die assembly of claim 3 wherein said retaining ring means includes a control ring having said control surface thereon and being in abutting engagement with said retaining ring means and said pilot ring, and means tied to said retaining ring means for adjustingly holding said control ring in place and for maintaining a gap between said control ring and said pilot ring which will allow said pilot ring to float radially.
Claim 8
Dependent Claim
25 words
The die assembly of claim 6 wherein said reducing die has a slightly inwardly tapered initial guiding surface adjoining and exterior of said directing surface.
Claim 9
Dependent Claim
25 words
The die assembly of claim 5 wherein said reducing die has a slightly inwardly tapered initial guiding surface adjoining and exterior of said directing surface.
Claim 10
Dependent Claim
25 words
The die assembly of claim 1 wherein said reducing die has a slightly inwardly tapered initial guiding surface adjoining and exterior of said directing surface.
Claim 11
Dependent Claim
91 words
The die assembly of claim 1 wherein said reducing die has a slightly inwardly tapered initial guiding surface adjoining and exterior of said directing surface, and wherein said retaining ring means includes a control ring having said control surface thereon and being in abutting engagement with said retaining ring means and said pilot ring, and means tied to said retaining ring means for adjustably holding said control ring in place and for maintaining a gap between said control ring and said pilot ring which allow said pilot ring to float radially.
References Cited (Backward Citations)
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |