US3593552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Can body fabrication
Assignee: Dayton Reliable Tool and Manufacturing Co
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Filing: 1969-03-12
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Granted: 1971-07-20
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Expires: 1989-03-12
Abstract
Abstract To produce a cylindrical can body, a cup-shaped workpiece having a relatively thick and relatively short cylindrical wall is telescoped over the end of a mandrel and a rotating ring of hard material is advanced axially onto and along the mandrel to cooperate with the mandrel to thin and spread the cylindrical wall.
Inventors
- 👤 Ermal C Fraze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:19
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/26; B21D22/00; B21D22/14; B21D22/16
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
215 words
A method of fabricating from ductile sheet material a cylindrical can body with an integral bottom wall, characterized by the steps of: forming the ductile sheet material into a cup-shaped receptacle having a cylindrical wall of substantially the desired inside diameter of the can body and having an axial dimension substantially less than the desired axial dimension of the can body with the cylindrical wall of the receptacle substantially thicker than the thickness desired in the finished can body; telescoping the cup-shaped receptacle over the end of a mandrel having a cross section corresponding to the desired internal configuration of the finished can body; providing a hard ring of an inside diameter exceeding the outside diameter of the mandrel by substantially twice the thickness desired for the cylindrical wall of the finished can body; and advancing the ring axially over the mandrel from the end thereof while simultaneously causing relative coaxial rotation between the ring and the mandrel to cause the inner circumferential surface of the ring to advance helically of the mandrel to thin the cylindrical wall of the receptacle to the desired final thickness and to spread the material of the cylindrical wall to increase the axial dimension of the receptacle to at least the desired final axial dimension of the can body.
Claim 2
Independent Claim
215 words
A method of fabricating from ductile sheet material a cylindrical can body with an integral bottom wall, characterized by the steps of: forming the ductile sheet material into a cup-shaped receptacle having a cylindrical wall of substantially the desired inside diameter of the can body and having an axial dimension substantially less than the desired axial dimension of the can body with the cylindrical wall of the receptacle substantially thicker than the thickness desired in the finished can body; telescoping the cup-shaped receptacle over the end of a mandrel having a cross section corresponding to the desired internal configuration of the finished can body; providing a hard ring of an inside diameter exceeding the outside diameter of the mandrel by substantially twice the thickness desired for the cylindrical wall of the finished can body; and advancing the ring axially over the mandrel from the end thereof while simultaneously causing relative coaxial rotation between the ring and the mandrel to cause the inner circumferential surface of the ring to advance helically of the mandrel to thin the cylindrical wall of the receptacle to the desired final thickness and to spread the material of the cylindrical wall to increase the axial dimension of the receptacle to at least the desired final axial dimension of the can body.
Claim 3
Independent Claim
228 words
A method of fabricating from ductile sheet material a cylindrical can body with an integral bottom wall, characterized by the steps of: forming the ductile sheet material into a cup-shaped receptacle having a cylindrical wall of substantially the desired inside diameter of the can body and having an axial dimension substantially less than 75 percent of the desired axial dimension of the can body with the average thickness of the cylindrical wall of the receptacle at least 35 percent thicker than the average thickness desired in the finished can body; telescoping the cup-shaped receptacle over the end of a mandrel having a cross section corresponding to the desired internal configuration of the finished can body; providing a hard ring of an inside diameter exceeding the outside diameter of the mandrel by substantially twice the thickness desired for the cylindrical wall of the finished can body; and advancing the ring aXially over the telescoped receptacle from the bottom end thereof while simultaneously causing relative coaxial rotation between the ring and the mandrel to cause the inner circumferential surface of the ring to advance helically of the mandrel to thin the cylindrical wall of the receptacle to the desired final thickness and to spread the material of the cylindrical wall to increase the axial dimension of the receptacle to at least the desired final axial dimension of the can body.
Claim 4
Independent Claim
228 words
A method of fabricating from ductile sheet material a cylindrical can body with an integral bottom wall, characterized by the steps of: forming the ductile sheet material into a cup-shaped receptacle having a cylindrical wall of substantially the desired inside diameter of the can body and having an axial dimension substantially less than 75 percent of the desired axial dimension of the can body with the average thickness of the cylindrical wall of the receptacle at least 35 percent thicker than the average thickness desired in the finished can body; telescoping the cup-shaped receptacle over the end of a mandrel having a cross section corresponding to the desired internal configuration of the finished can body; providing a hard ring of an inside diameter exceeding the outside diameter of the mandrel by substantially twice the thickness desired for the cylindrical wall of the finished can body; and advancing the ring aXially over the telescoped receptacle from the bottom end thereof while simultaneously causing relative coaxial rotation between the ring and the mandrel to cause the inner circumferential surface of the ring to advance helically of the mandrel to thin the cylindrical wall of the receptacle to the desired final thickness and to spread the material of the cylindrical wall to increase the axial dimension of the receptacle to at least the desired final axial dimension of the can body.
Claim 5
Dependent Claim
36 words
A method as set forth in claim 1 which includes the step of pressing the bottom wall of the receptacle against the end of the mandrel to anchor the receptacle against rotation relative to the mandrel.
Claim 6
Dependent Claim
25 words
A method as set forth in claim 1 in which the mandrel is held against rotation and the ring is rotated as it is advanced.
Claim 7
Independent Claim
278 words
A method of fabricating from ductile sheet material a cylindrical can body with an integral bottom wall, characterized by the steps of: providing a blank of ductile sheet material of a thickness greater than any wall thickness desired in the finished can body; forming the blank sheet into a cup-shaped receptacle having a cylindrical wall of substantially the desired inside diameter of the can body and having an axial dimension substantially less than the desired axial dimension of the can body with the cylindrical wall of the receptacle substantially thicker than the thickness desired in the finished can body; squeezing the bottom wall of the cup-shaped receptacle to reduce the thickness of the bottom wall to the desired final thickness and to spread material of the bottom wall radially to form a circumferential bead on the receptacle; telescoping the cup-shaped receptacle over the end of a mandrel having a cross section corresponding to the desired internal configuration of the finished can body; providing a hard ring of an inside diameter exceeding the outside diameter of the mandrel by substantially twice the thickness desired for the cylindrical wall of the finished can body; and advancing the ring axially over the telescoped receptacle from the bottom end thereof while simultaneously causing relative coaxial rotation between the ring and the mandrel to cause the inner circumferential surface of the ring to advance helically of the mandrel to thin the cylindrical wall of the receptacle to the desired final thickness and to spread the material of the cylindrical wall including said bead to increase the axial dimension of the receptacle to at least the desired final axial dimension of the can body.
Claim 8
Independent Claim
278 words
A method of fabricating from ductile sheet material a cylindrical can body with an integral bottom wall, characterized by the steps of: providing a blank of ductile sheet material of a thickness greater than any wall thickness desired in the finished can body; forming the blank sheet into a cup-shaped receptacle having a cylindrical wall of substantially the desired inside diameter of the can body and having an axial dimension substantially less than the desired axial dimension of the can body with the cylindrical wall of the receptacle substantially thicker than the thickness desired in the finished can body; squeezing the bottom wall of the cup-shaped receptacle to reduce the thickness of the bottom wall to the desired final thickness and to spread material of the bottom wall radially to form a circumferential bead on the receptacle; telescoping the cup-shaped receptacle over the end of a mandrel having a cross section corresponding to the desired internal configuration of the finished can body; providing a hard ring of an inside diameter exceeding the outside diameter of the mandrel by substantially twice the thickness desired for the cylindrical wall of the finished can body; and advancing the ring axially over the telescoped receptacle from the bottom end thereof while simultaneously causing relative coaxial rotation between the ring and the mandrel to cause the inner circumferential surface of the ring to advance helically of the mandrel to thin the cylindrical wall of the receptacle to the desired final thickness and to spread the material of the cylindrical wall including said bead to increase the axial dimension of the receptacle to at least the desired final axial dimension of the can body.
Claim 9
Dependent Claim
23 words
A method as set forth in claim 1 in which the leading inner circumferential rim of the ring is of rounded cross-sectional configuration.
Claim 10
Dependent Claim
30 words
A method as set forth in claim 1 in which the inner circumference of the ring is of stepped configuration to thin the cylindrical wall of the receptacle by stages.
Claim 11
Dependent Claim
86 words
A method as set forth in claim 1 in which the inside diameter of the leading end portion of the ring is less than the outside diameter of the receptacle but greater than the desired outside diameter of the finished can body; and in which the ring is formed with an inner circumferential shoulder spaced from the leading end portion of the ring, the inside diameter of the ring being stepped down at the shoulder to substantially the desired outside diameter of the finished can body.
Claim 12
Dependent Claim
86 words
A method as set forth in claim 1 in which the inside diameter of the leading end portion of the ring is less than the outside diameter of the receptacle but greater than the desired outside diameter of the finished can body; and in which the ring is formed with a plurality of inner circumferential shoulders at each of which the inside diameter of the ring steps down, the last shoulder stepping the inside diameter down to the desired outside diameter of the finished can body.
Claim 13
Dependent Claim
41 words
A method as set forth in claim 1 in which the mandrel tapers in diameter towards its opposite ends for maximum thinning of the material in the interMediate region of the length of the cylindrical wall of the finished can body.
Claim 14
Dependent Claim
37 words
A method as set forth in claim 1 which includes the step of trimming the cylindrical wall of the receptacle to length while the receptacle is on the mandrel after the receptacle is processed by the ring.
Claim 15
Independent Claim
167 words
An apparatus for spreading the material of the cylindrical wall of a cup-shaped receptacle for the dual purpose of thinning the cylindrical wall to a predetermined thickness and of increasing the axial dimension of the cylindrical wall, comprising: a mandrel dimensioned to fit into the receptacle to support the receptacle from inside, said mandrel tapering in diameter towards its opposite ends for maximum thinning of the material in the intermediate region of the length of the cylindrical wall of the finished can body; a ring having an inner circumferential surface of material substantially harder than the material of the receptacle and having an inside diameter exceeding the diameter of the mandrel by substantially twice said predetermined thickness; means to create relative axial movement between the ring and the mandrel to advance the ring coaxially of the mandrel over the end of the mandrel and along the length of the mandrel; and means to cause relative coaxial rotation between the ring and the mandrel as the mandrel advances.
Claim 16
Independent Claim
167 words
An apparatus for spreading the material of the cylindrical wall of a cup-shaped receptacle for the dual purpose of thinning the cylindrical wall to a predetermined thickness and of increasing the axial dimension of the cylindrical wall, comprising: a mandrel dimensioned to fit into the receptacle to support the receptacle from inside, said mandrel tapering in diameter towards its opposite ends for maximum thinning of the material in the intermediate region of the length of the cylindrical wall of the finished can body; a ring having an inner circumferential surface of material substantially harder than the material of the receptacle and having an inside diameter exceeding the diameter of the mandrel by substantially twice said predetermined thickness; means to create relative axial movement between the ring and the mandrel to advance the ring coaxially of the mandrel over the end of the mandrel and along the length of the mandrel; and means to cause relative coaxial rotation between the ring and the mandrel as the mandrel advances.
Claim 17
Dependent Claim
21 words
An apparatus as set forth in claim 12 which includes means to hold the receptacle against rotation relative to the mandrel.
Claim 18
Dependent Claim
35 words
An apparatus as set forth in claim 12 which includes means to press the bottom wall of the receptacle against the end of the mandrel to anchor the receptacle against rotation relative to the mandrel.
Claim 19
Dependent Claim
37 words
An apparatus as set forth in claim 12 which includes: a carriage on which the ring is rotatably mounted; means on the carriage to rotate the ring; and means to shift the carriage axially of the mandrel.
Claim 20
Dependent Claim
25 words
An apparatus as set forth in claim 12 in which the inner rim of the leading end of the ring is of rounded cross-sectional configuration.
Claim 21
Dependent Claim
30 words
An apparatus as set forth in claim 12 in which the inner circumference of the ring is of stepped configuration to thin the cylindrical wall of the receptacle by stages.
Claim 22
Dependent Claim
85 words
An apparatus as set forth in claim 12 in which the inside diameter of the leading end portion of the ring is less than the outside diameter of the receptacle but greater than the desired outside diameter of the finished can body; and in which the ring is formed with an inner circumferential shoulder spaced from the leading end of the ring, the inside diameter of the ring being stepped down at the shoulder to substantially the desired outside diameter of the finished can body.
Claim 23
Dependent Claim
86 words
An apparatus as set forth in claim 12 in which the inside diameter of the leading end portion of the ring is less than the outside diameter of the receptacle but greater than the desired outside diameter of the finished can body; and in which the ring is formed with a plurality of inner circumferential shoulders at each of which the inside diameter of the ring steps down, the last shoulder stepping the inside diameter down to the desired outside diameter of the finished can body.
Claim 24
Dependent Claim
27 words
An apparatus as set forth in claim 12 in which said ring has a replaceable liner of tungsten carbide providing said inner circumferential surface of the ring.
Claim 25
Dependent Claim
29 words
An apparatus as set forth in claim 12 which includes means to trim the thinned cylindrical wall of the receptacle to length while the receptacle is on the mandrel.
Claim 26
Dependent Claim
18 words
An apparatus as set forth in claim 12 in which the ring has at least one replaceable liner.
Claim 27
Dependent Claim
21 words
An apparatus as set forth in claim 22 in which the ring has a plurality of liners positioned end to end.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |