Patent US3898828A successfully refreshed from Google Patents.
US3898828A
Expired / Lapsed
US
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Die assembly and method for interior roll-necking-in a tubular member
Assignee: Primerica Inc
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Filing: 1973-10-01
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Granted: 1975-08-12
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Expires: 1993-10-01
Abstract
Abstract A die assembly and method for interior roll-necking-in an end portion of a tubular member. The die assembly comprises an outer reducing die and a rotatable spindle assembly concentricallymounted therewithin and axially-movable in relation thereto. The spindle assembly includes a plunger having cam surfaces thereon and a pilot in turn including a housing having an axial bore therethrough and a radial slot communicating therewith, and a free-wheeling roller axially-mounted between the legs of a substantially U-shaped bracket radially slideably seated within the slot. The bracket includes bracket cam surfaces cooperative with plunger cam surfaces for moving the roller radially when the plunger is moved axially through the housing. The pilot can include biasing means for biasing the bracket and roller radially inward toward the plunger, and cushioning means loosely pinmounted within cavities in the bracket legs to allow the shoes to slide radially in the cavities to compensate for variations in wall thickness of the tubular member. The method comprises providing an outer reducing die having a chamber whose walls include an inwardly-angled directing surface and a rim-forming surface, providing a rotatable, radiallymovable roller axially-mounted interior of the die chamber, axially moving the marginal edge portion of a tubular member into the chamber mouth, and simultaneously moving the roller vertically toward the marginal edge portion and spinning a portion thereof against the die chamber walls to neck in the tubular member. The method can also include allowing the roller to move radially inward away from a marginal edge portion which is thicker than the rest of the wall of the tubular member.
Inventors
- 👤 Eugene Cassai
- 👤 Andrew Halasz
- 👤 Edward Herman Hanke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:35
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/26; B21D51/2615; B21D51/2638; B21D41/00; B21D41/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
402 words
A die assembly for interior roll-necking-in an end portion of a tubular member comprising: an outer reducing die having a chamber whose walls include an annular inwardly-angled directing surface and an annular rimforming surface adjoining and axially interior of said directing surface, a rotatable spindle assembly concentrically mounted within said outer reducing die, said spindle assembly including a. an axially-movable elongated plunger having cam surfaces thereon, b. a hollow spindle having pilot mounting means thereon, c. a pilot, said pilot including i. a cylindrical housing mounted onto said pilot mounting means, said housing having inner and outer end walls, a circumferential sidewall, a bore running from said inner end wall axially through said housing for receiving said plunger, a slot, and a slot extension formed in said side wall, said slot communicating axially with said bore and extending radially from said bore through said slot extension, ii. a free-wheeling roller mounted within said housing in a manner that the axis of said roller is parallel to the axis of said housing, said roller including a frustoconical portion and an adjoining axially-interior cylindrical portion, the circumferential profile of said roller substantially corresponding to the profile of said outer reducing die chamber surfaces, iii. means for mounting said roller within said housing slot so that its axis is parallel to that of said housing and so that said roller is radially movable within said slot, iv. biasing means for biasing said roller radially inward toward said plunger, v. means for moving said roller radially outward to allow the outer surfaces of said frustoconical and cylindrical roller portion to protrude through said slot extension in said side wall to allow the surfaces of said roller portions to engage the interior wall surfaces of a tubular member placed within the outer reducing die, and vi. means for axially retaining said roller mounting means within said slot; vii. means for rotating said pilot housing; and means for independently advancing and retracting said plunger such that when a marginal edge portion of said tubular member is within said reducing die chamber, all of said previously recited means cooperate to move said roller axially outward and cause it to spin against and neck-in said portion of said tubular member and to move said roller radially inward away from said necked-in portion so that said necked-in portion clears said roller when said tubular member is withdrawn from said die assembly.
Claim 2
Dependent Claim
402 words
A die assembly for interior roll-necking-in an end portion of a tubular member comprising: an outer reducing die having a chamber whose walls include an annular inwardly-angled directing surface and an annular rimforming surface adjoining and axially interior of said directing surface, a rotatable spindle assembly concentrically mounted within said outer reducing die, said spindle assembly including a. an axially-movable elongated plunger having cam surfaces thereon, b. a hollow spindle having pilot mounting means thereon, c. a pilot, said pilot including i. a cylindrical housing mounted onto said pilot mounting means, said housing having inner and outer end walls, a circumferential sidewall, a bore running from said inner end wall axially through said housing for receiving said plunger, a slot, and a slot extension formed in said side wall, said slot communicating axially with said bore and extending radially from said bore through said slot extension, ii. a free-wheeling roller mounted within said housing in a manner that the axis of said roller is parallel to the axis of said housing, said roller including a frustoconical portion and an adjoining axially-interior cylindrical portion, the circumferential profile of said roller substantially corresponding to the profile of said outer reducing die chamber surfaces, iii. means for mounting said roller within said housing slot so that its axis is parallel to that of said housing and so that said roller is radially movable within said slot, iv. biasing means for biasing said roller radially inward toward said plunger, v. means for moving said roller radially outward to allow the outer surfaces of said frustoconical and cylindrical roller portion to protrude through said slot extension in said side wall to allow the surfaces of said roller portions to engage the interior wall surfaces of a tubular member placed within the outer reducing die, and vi. means for axially retaining said roller mounting means within said slot; vii. means for rotating said pilot housing; and means for independently advancing and retracting said plunger such that when a marginal edge portion of said tubular member is within said reducing die chamber, all of said previously recited means cooperate to move said roller axially outward and cause it to spin against and neck-in said portion of said tubular member and to move said roller radially inward away from said necked-in portion so that said necked-in portion clears said roller when said tubular member is withdrawn from said die assembly.
Claim 3
Dependent Claim
73 words
The die assembly of claim 1 wherein said roller mounting means includes bracket means including a substantially U-shaped bracket radially slideably seated within said slot, said bracket having a backwall and legs extending perpendicularly from said backwall for mounting said roller between the legs, roller pin holes extending axially into said bracket legs, and a roller pin for pin-mounting said roller thereon, said roller being pin mounted on said pin between said legs.
Claim 4
Dependent Claim
52 words
The die assembly of claim 2 wherein said roller mounting means includes bracket cam surfaces which cooperate with said plunger cam surfaces to allow said roller to be moved radially outward and inward as said respective cam surfaces engage and disengage each other when said plunger is moved axially through said housing.
Claim 5
Dependent Claim
30 words
The die assembly of claim 3 wherein said biasing means includes a helical spring mounted radiallY between and having its end portions engaging portions of said housing and said bracket.
Claim 6
Dependent Claim
37 words
The die assembly of claim 4 wherein one of said bracket legs has a cutout therein running substantially the length of and through a portion of said leg, said cutout being for seating said helical spring therein.
Claim 7
Dependent Claim
148 words
The die assembly of claim 2 wherein said roller mounting means includes cam surfaces on said plunger, a pair of cavities in said bracket, each cavity being cut vertically into said bracket backwall and extending into one of said legs, a pair of shoe pins for mounting shoes thereon, axial pin holes in said bracket each pin hole communicating with each of said cavities, and a pair of shoes, each of said shoes being pin-mounted in one of said cavities, each of said shoes having a top and bottom, said bottom having an angled cam surface thereon exposed beyond the plane of said bracket backwall, each of said plunger and shoe cam surfaces being cooperative to allow said roller to be moved radially outward and inward as said respective plunger and shoe cam surfaces engage and disengage each other when said plunger is moved axially through said housing.
Claim 8
Dependent Claim
78 words
The die assembly of claim 6 wherein said bracket legs include resilient cushioning means seated in said cavities and held there by said shoe top walls, and wherein the diameter of said shoe pin holes are larger than the diameter of said shoe pins so that said shoes are loosely pin-mounted to said bracket, to allow said shoes to slide radially in said bracket cavities and thereby compensate for any variations in wall thickness of said tubular member.
Claim 9
Dependent Claim
52 words
The die assembly of claim 7 wherein said roller mounting means includes bracket cam surfaces which cooperate with said plunger cam surfaces to allow said roller to be moved radially outward and inward as said respective cam surfaces engage and disengage each other when said plunger is moved axially through said housing.
Claim 10
Dependent Claim
33 words
The die assembly of claim 8 wherein said biasing means includes a helical spring mounted in said cutout radially between and having its end portions engaging portions of said housing and said bracket.
Claim 11
Dependent Claim
20 words
The die assembly of claim 9 wherein said pilot includes a plurality of said rollers pin-mounted to said roller housing.
Claim 12
Independent Claim
186 words
A method of interior roll-necking-in a tubular member which comprises: providing an outer reducing die having a chamber whose walls include an annular inwardly-angled directing surface, and an annular rim-forming surface adjoining and axially interior of said directing surface, providing a plurality of rotatable rollers pin-mounted to a pilot axially interior of said die chamber in a manner that the axes of the rollers are parallel to that of the pilot. axially aligning the marginal portion of the wall of an open end of a tubular member with the chamber mouth, axially moving said marginal edge portion gradually into the die chamber so that the outer wall surface of the marginal edge portion engages one of said chamber surfaces, and simultaneously with said axial moving step, moving said rollers vertically towards said rim-forming surface in a manner that the axes of the rollers remain parallel to that of the pilot, and spinning a portion of said marginal edge portion against said chamber surfaces so that said rim-forming surface imparts a neck of reduced diameter to said portion of said marginal edge portion of said tubular member.
Claim 13
Independent Claim
186 words
A method of interior roll-necking-in a tubular member which comprises: providing an outer reducing die having a chamber whose walls include an annular inwardly-angled directing surface, and an annular rim-forming surface adjoining and axially interior of said directing surface, providing a plurality of rotatable rollers pin-mounted to a pilot axially interior of said die chamber in a manner that the axes of the rollers are parallel to that of the pilot. axially aligning the marginal portion of the wall of an open end of a tubular member with the chamber mouth, axially moving said marginal edge portion gradually into the die chamber so that the outer wall surface of the marginal edge portion engages one of said chamber surfaces, and simultaneously with said axial moving step, moving said rollers vertically towards said rim-forming surface in a manner that the axes of the rollers remain parallel to that of the pilot, and spinning a portion of said marginal edge portion against said chamber surfaces so that said rim-forming surface imparts a neck of reduced diameter to said portion of said marginal edge portion of said tubular member.
Claim 14
Dependent Claim
72 words
The method of claim 11 wherein there is included the step of compensating for extra thicknesses in said wall of said marginal edge portion of said tubular member by allowing each of said rollers to move independently radially inward away from said marginal edge portion when each of said rollers engages a portion of said wall marginal edge portion which is thicker than the rest of the wall of said tubular member.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |