US3704618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making a drawn article
Assignee: Reynolds Metals Co
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Filing: 1970-10-28
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Granted: 1972-12-05
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Expires: 1990-10-28
Abstract
Abstract A die block, a shearing die, means for causing relative movement between the die block and the shearing die to shear an article from a blank of material when the blank is disposed therebetween, a ram, and means for causing relative movement between the ram and the die block to draw the sheared article into a drawn shape, the die block and shearing die having cooperating drawing surfaces for respectively engaging against opposed sides of the sheared article and from between which the sheared article is adapted to be drawn by the drawing operation of the ram and the die block. The apparatus has means for maintaining a predetermined spacing between the drawing surfaces of the die block and the shearing die during the entire drawing operation of the sheared article therefrom so as to tend to prevent adverse ears at the outer peripheral edge of such drawn article.
Inventors
- 👤 Daniel S Cvacho
- 👤 Harry W Lee Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:20
CPC Classifications
B; B21; B21D; B21D37/00; B21D37/08; B21D22/00; B21D22/20; B21D22/22; B21D35/00
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
147 words
Apparatus for making a drawn article from a blank of material having a particular thickness comprising a die block, a shearing die, means for causing relative movement between said die block and said shearing die to shear said article from said blank when said blank is disposed therebetween, a ram, and means for causing relative movement between said ram and said die block to draw said sheared article into a drawn shape, said die block and said shearing die having cooperating drawing surfaces for respectively engaging against opposed sides of said sheared article and from between which said sheared article is adapted to be drawn by said drawing operation of said ram and said die block, said apparatus having means maintaining a predetermined fixed spacing between said drawing surfaces of said die block and said shearing die during said entire drawing operation of said sheared article therefrom.
Claim 2
Dependent Claim
147 words
Apparatus for making a drawn article from a blank of material having a particular thickness comprising a die block, a shearing die, means for causing relative movement between said die block and said shearing die to shear said article from said blank when said blank is disposed therebetween, a ram, and means for causing relative movement between said ram and said die block to draw said sheared article into a drawn shape, said die block and said shearing die having cooperating drawing surfaces for respectively engaging against opposed sides of said sheared article and from between which said sheared article is adapted to be drawn by said drawing operation of said ram and said die block, said apparatus having means maintaining a predetermined fixed spacing between said drawing surfaces of said die block and said shearing die during said entire drawing operation of said sheared article therefrom.
Claim 3
Dependent Claim
66 words
Apparatus as set forth in claim 1 wherein said means for maintaining a predetermined fixed spacing between said drawing surfaces of said die block and said shearing die comprises stop means to terminate the movement between said shearing die and said die block, with said fixed spacing being less than said particular thickness and always fully related thereto to provide a controlled drawing of said article.
Claim 4
Dependent Claim
23 words
Apparatus as set forth in claim 2 wherein said stop means comprises cooperating stop surfaces on said shearing die and said die block.
Claim 5
Dependent Claim
35 words
Apparatus as set forth in claim 3 wherein said stop surfaces are adapted to engage and hold said blank therebetween during said entire drawing operation whereby the thickness of said blank controls said fixed spacing.
Claim 6
Dependent Claim
40 words
Apparatus as set forth in claim 4 wherein said stop surfaces are so constructed and arranged that when holding said blank therebetween said drawing surfaces of said die block and said shearing die are closer together than said stop surfaces.
Claim 7
Dependent Claim
47 words
Apparatus as set forth in claim 4 wherein said die block and said shearing die having cooperating shearing surfaces for shearing said article from said blank, said shearing surfaces respectively being disposed intermediate said stop surfaces and said drawing surfaces of said die block and Shearing die.
Claim 8
Dependent Claim
68 words
Apparatus as set forth in claim 6 wherein said surfaces of said die block and said shearing die are annular with said drawing surfaces being disposed inboard of the other surfaces whereby said die block and said shearing die are adapted to shear a circular article from said blank and whereby said ram and said die block are adapted to draw said circular article into a cup shape.
Claim 9
Dependent Claim
40 words
Apparatus as set forth in claim 1 wherein said means for maintaining a predetermined spacing between said drawing surfaces of said die block and said shearing die is adapted to maintain said spacing narrower than the thickness of said blank.
Claim 10
Dependent Claim
45 words
Apparatus as set forth in claim 8 wherein said means for maintaining a predetermined spacing between said drawing surfaces of said die block and said shearing die comprises means on said die block and said shearing die homing on said blank during the shearing thereof.
Claim 11
Dependent Claim
23 words
Apparatus as set forth in claim 1 wherein said die block is stationary and said shearing die and said ram move relative thereto.
Claim 12
Dependent Claim
56 words
Apparatus as set forth in claim 10 wherein said means for causing relative movement between said shearing die and said die block comprises a crankshaft rotatably carried by said apparatus and operatively interconnected to said shearing die to cause reciprocating movement of said shearing die relative to said die block during rotational movement of said crankshaft.
Claim 13
Dependent Claim
49 words
Apparatus as set forth in claim 11 wherein said means for causing relative movement between said ram and said die block comprises said crankshaft also being operatively interconnected to said ram to cause reciprocating movement of said ram relative to said die block during rotational movement of said crankshaft.
Claim 14
Dependent Claim
44 words
Apparatus as set forth in claim 12 wherein said apparatus has another die block and cooperating shearing die and ram operatively interconnected to said crankshaft to operate in the same manner as the first named shearing die and ram during rotation of said crankshaft.
Claim 15
Dependent Claim
49 words
Apparatus as set forth in claim 13 wherein said apparatus has another rotatable crankshaft and another pair of die blocks and cooperating shearing dies and rams operatively interconnected to said other crankshaft to be reciprocated thereby relative to said other pair of die blocks as said other crankshaft rotates.
Claim 16
Dependent Claim
65 words
Apparatus as set forth in claim 4 wherein said die block has a top and a bottom surface and an opening passing through said top and bottom surfaces and through which said ram draws said article, said top surface defining the drawing surface of said die block and said bottom surface being adapted to strip said drawn article from said ram after said drawing operation.
Claim 17
Dependent Claim
114 words
Apparatus for making a drawn article from a blank of material comprising a die block, a shearing die, a ram arranged concentrically within said shearing die in telescoped relation, and a crankshaft rotatably carried by said apparatus and being operatively interconnected to said shearing die and to said ram to cause reciprocating movement thereof relative to said die block while said crankshaft rotates, said crankshaft being adapted to cause said shearing die to cooperate with said die block to shear said article from said blank and then being adapted to cause said ram to telescope through said shearing die and cooperate with said die block to draw said sheared article in a drawn shape.
Claim 18
Dependent Claim
114 words
Apparatus for making a drawn article from a blank of material comprising a die block, a shearing die, a ram arranged concentrically within said shearing die in telescoped relation, and a crankshaft rotatably carried by said apparatus and being operatively interconnected to said shearing die and to said ram to cause reciprocating movement thereof relative to said die block while said crankshaft rotates, said crankshaft being adapted to cause said shearing die to cooperate with said die block to shear said article from said blank and then being adapted to cause said ram to telescope through said shearing die and cooperate with said die block to draw said sheared article in a drawn shape.
Claim 19
Dependent Claim
44 words
Apparatus as set forth in claim 16 wherein said apparatus has another die block and cooperating shearing die and ram operatively interconnected to said crankshaft to operate in the same manner as the first named shearing die and ram during rotation of said crankshaft.
Claim 20
Dependent Claim
49 words
Apparatus as set forth in claim 17 wherein said apparatus has another rotatable crankshaft and another pair of die blocks and cooperating shearing dies and rams operatively interconnected to said other crankshaft to be reciprocated thereby relative to said other pair of die blocks as said other crankshaft rotates.
Claim 21
Dependent Claim
19 words
Apparatus aS set forth in claim 18 wherein said two crankshafts are operatively interconnected together to rotate in unison.
Claim 22
Independent Claim
136 words
A method for making a drawn article from a blank of material having a particular thickness comprising the steps of, disposing said blank between a die block and a shearing die, causing relative movement between said die block and said shearing die to shear said article from said blank, causing relative movement between a ram and said die block to draw said sheared article into a drawn shape, said die block and said shearing die having cooperating drawing surfaces respectively engaging against opposed sides of said sheared article and from between which said sheared article is drawn by said drawing operation of said ram and said die block, and maintaining a predetermined fixed spacing between said drawing surfaces of said die block and said shearing die during said entire drawing operation of said sheared article therefrom.
Claim 23
Independent Claim
136 words
A method for making a drawn article from a blank of material having a particular thickness comprising the steps of, disposing said blank between a die block and a shearing die, causing relative movement between said die block and said shearing die to shear said article from said blank, causing relative movement between a ram and said die block to draw said sheared article into a drawn shape, said die block and said shearing die having cooperating drawing surfaces respectively engaging against opposed sides of said sheared article and from between which said sheared article is drawn by said drawing operation of said ram and said die block, and maintaining a predetermined fixed spacing between said drawing surfaces of said die block and said shearing die during said entire drawing operation of said sheared article therefrom.
Claim 24
Dependent Claim
69 words
A method as set forth in claim 20 wherein said step of maintaining a predetermined fixed spacing between said drawing surfaces of said die block and said shearing die comprises the step of terminating the movement between said shearing die and said die block with stop means, with said fixed spacing being less than said particular thickness and always fully related hereto to provide controlled drawing of said article.
Claim 25
Dependent Claim
24 words
A method as set forth in claim 22 wherein said stop means comprises cooperating stop surfaces on said shearing die and said die block.
Claim 26
Dependent Claim
33 words
A method as set forth in claim 22 wherein said stop surfaces engage and hold said blank therebetween during said entire drawing operation whereby the thickness of said blank controls said fixed spacing.
Claim 27
Dependent Claim
32 words
A method as set forth in claim 23 wherein said drawing surfaces of said die block and said shearing die are spaced closer together than said stop surfaces during said drawing operation.
Claim 28
Dependent Claim
47 words
A method as set forth in claim 24 wherein said die block and said shearing die having cooperating shearing surfaces shearing said article from said blank, said shearing surfaces respectively being disposed intermediate said stop surface and said drawing surfaces of said die block and shearing die.
Claim 29
Dependent Claim
44 words
A method as set forth in claim 25 wherein said step of shearing said article from said blank comprises the step of shearing a circular article from said blank whereby said ram and said die block draw said circular article into a cup shape.
Claim 30
Dependent Claim
42 words
A method as set forth in claim 20 wherein said step of maintaining a predetermined spacing between said drawing surfaces of said die block and said shearing die comprises the step of maintaining said spacing narrower than the thickness of said blank.
Claim 31
Dependent Claim
47 words
A method as set forth in claim 27 wherein said step of maintaining a predetermined spacing between said drawing surfaces of said die block and said shearing die comprises the step of homing said die block and said shearing die on said blank during the shearing thereof.
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) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |