Patent US3751962A successfully refreshed from Google Patents.
US3751962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making a drawn article
Assignee: Reynolds Metals Co
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Filing: 1970-11-06
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Granted: 1973-08-14
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Expires: 1990-11-06
Abstract
Abstract An apparatus for drawing an article from a blank of material disposed between cooperating draw members and being drawn therefrom by a movable ram moving relative to the draw members and having a fluid chamber receiving piston portions of one of the draw members and the ram whereby relative movement between the apparatus and the one draw member in one direction causes the blank drawing movement of the ram by the fluid action between the piston portions in the chamber. Restriction means are provided in the chamber for restricting fluid flow between the piston portions at least during the initial part of the drawing operation of said ram on said blank so that a back pressure is created on the one draw member to maintain sufficient holding force on the blank being drawn therefrom to prevent adverse wrinkles on the article being drawn.
Inventors
- 👤 D Cvacho
- 👤 J Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:56
CPC Classifications
B; B21; B21D; B21D24/00; B21D24/10; B21D24/14; B21D22/00; B21D22/20; B21D22/22
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
237 words
In an apparatus adapted for drawing an article from a blank of material adapted to be disposed between cooperating draw members and being adapted to be drawn therefrom by a movable ram moving relative to said draw members and with said apparatus having a single fluid chamber receiving coaxially arranged piston portions of one of said draw members and said ram whereby relative movement between said apparatus and said one draw member in one direction causes the drawing movement of said ram by the fluid action between said coaxially arranged piston portions in said chamber, the improvement comprising restricting and separating means on at least one of said piston portions and being located in said chamber, said restricting and separating means restricting fluid flow between said piston portions at least during part of the drawing operation of said ram on said blank, said restricting and separating means separating said chamber into two interconnected chamber parts and the fluid in one chamber part associates primarily with the piston portion comprising said one draw member and creates a back force on the piston portion of the one draw member greater than the force that would be created on said piston portion of the one draw member only by the resistance of the blank to the drawing action of the ram to thereby provide a controlled holding force of the one draw member on the blank during the drawing operation.
Claim 2
Dependent Claim
237 words
In an apparatus adapted for drawing an article from a blank of material adapted to be disposed between cooperating draw members and being adapted to be drawn therefrom by a movable ram moving relative to said draw members and with said apparatus having a single fluid chamber receiving coaxially arranged piston portions of one of said draw members and said ram whereby relative movement between said apparatus and said one draw member in one direction causes the drawing movement of said ram by the fluid action between said coaxially arranged piston portions in said chamber, the improvement comprising restricting and separating means on at least one of said piston portions and being located in said chamber, said restricting and separating means restricting fluid flow between said piston portions at least during part of the drawing operation of said ram on said blank, said restricting and separating means separating said chamber into two interconnected chamber parts and the fluid in one chamber part associates primarily with the piston portion comprising said one draw member and creates a back force on the piston portion of the one draw member greater than the force that would be created on said piston portion of the one draw member only by the resistance of the blank to the drawing action of the ram to thereby provide a controlled holding force of the one draw member on the blank during the drawing operation.
Claim 3
Dependent Claim
22 words
In an apparatus as set forth in claim 1, the further improvement wherein said restricting and separating means provides a varying restriction.
Claim 4
Dependent Claim
37 words
In an apparatus as set forth in claim 2, the further improvement wherein said restricting and separating means comprises means for progressively increasing the size of said restriction during at least said part of said drawing operation.
Claim 5
Dependent Claim
29 words
In an apparatus as set forth in claim 1, the further improvement wherein said part of said drawing operation takes place during the initial part of said drawing operation.
Claim 6
Dependent Claim
32 words
In an apparatus as set forth in claim 4, the further improvement wherein said restricting and separating means does not restrict such fluid flow during the remaining part of said drawing operation.
Claim 7
Dependent Claim
49 words
In an apparatus as set forth in claim 1, the further improvement wherein said restricting and separating means comprises a wall disposed in said chamber and separating said chamber between said piston portions into two chamber parts, said wall having a fixed orifice therethrough interconnecting said chamber parts together.
Claim 8
Dependent Claim
37 words
In an apparatus as set forth in claim 6, the further improvement wherein a one-way flow device also interconnects said chamber parts together to facilitate return of said ram to its non-drawing position relative to said apparatus.
Claim 9
Dependent Claim
61 words
In an apparatus as set forth in claim 1, the further improvement wherein said restricting and separating means comprises cooperating surfaces on said piston portions of said one draw member and said ram that separate said chamber between said piston portions into said two chamber parts, the spacing between said surfaces interconnecting said chamber parts together and providing said restricted flow.
Claim 10
Dependent Claim
37 words
In an apparatus as set forth in claim 8, the further improvement wherein a one-way flow device also interconnects said chamber parts together to facilitate return of said ram to its non-drawing position relative to said apparatus.
Claim 11
Dependent Claim
61 words
In an apparatus as set forth in claim 8, the further improvement wherein said piston portion of said ram is disposed within said piston portion of said one draw member, said surface of said ram comprising a spool, said surface of said one draw member comprising a ring telescoping with said spool during at least said part of said drawing operation.
Claim 12
Dependent Claim
46 words
In an apparatus as set forth in claim 10, the further improvement wherein said spool has a tapering surface to provide for a progressively increasing in the size of the restriction between said spool and said ring during at least said part of said drawing operation.
Claim 13
Dependent Claim
68 words
In an apparatus as set forth in claim 10, the further improvement wherein said spool has an outer cylindrical surface disposed coaxial with said ring during the entire telescoping relation therebetween, said cylindrical surface having at least one tapering groove therein to provide for a progressively increasing in the size of the restriction between said spool and said ring during at least said part of said drawing operation.
Claim 14
Dependent Claim
211 words
In an apparatus adapted for drawing an article from a blank of material adapted to be disposed between cooperating draw members and being adapted to be drawn therefrom by a movable ram moving relative to said draw members and with said apparatus having a single fluid chamber receiving piston portions of one said draw members and said ram whereby relative movement between said apparatus and said one draw member in one direction causes the blank drawing movement of said ram by the fluid action between said piston portions in said chamber, the improvement comprising restricting and separating means on at least one of said piston portions and being located in said chamber, said restricting and separating means causing said fluid to create a force on said piston portion of said one draw member greater than the force that would be created on said piston portion of said one draw member by the resistance of said blank to the drawing action of said ram thereon at least during part of the drawing operation of said ram on said blank, said restricting and separating means in said chamber separating said chamber into two chamber parts with the fluid in one chamber part associating primarily with the piston portion of said one draw member.
Claim 15
Dependent Claim
211 words
In an apparatus adapted for drawing an article from a blank of material adapted to be disposed between cooperating draw members and being adapted to be drawn therefrom by a movable ram moving relative to said draw members and with said apparatus having a single fluid chamber receiving piston portions of one said draw members and said ram whereby relative movement between said apparatus and said one draw member in one direction causes the blank drawing movement of said ram by the fluid action between said piston portions in said chamber, the improvement comprising restricting and separating means on at least one of said piston portions and being located in said chamber, said restricting and separating means causing said fluid to create a force on said piston portion of said one draw member greater than the force that would be created on said piston portion of said one draw member by the resistance of said blank to the drawing action of said ram thereon at least during part of the drawing operation of said ram on said blank, said restricting and separating means in said chamber separating said chamber into two chamber parts with the fluid in one chamber part associating primarily with the piston portion of said one draw member.
Claim 16
Dependent Claim
55 words
In an apparatus as set forth in claim 13, the further Improvement wherein said part of said drawing operation takes place only during the initial part of said drawing operation so that said restricting and separating means does not effect the fluid force between said piston portions during the remaining part of said drawing operation.
Claim 17
Dependent Claim
37 words
In an apparatus as set forth in claim 13, the further improvement wherein said restricting and separating means varies the force on said piston portion of said one draw member during said part of said drawing operation.
Claim 18
Dependent Claim
224 words
In a method for drawing an article from a blank of material disposed between cooperating draw members and being drawn therefrom by a movable ram moving relative to the draw members and with a single fluid chamber receiving piston portions of one of said draw members and said ram so that relative movement between said one draw member and said fluid chamber in one direction causes the blank drawing movement of said ram by the fluid action between said piston portions in the camber, the improvement comprising the step of restricting fluid flow between said piston portions at least during part of the drawing operation of said ram on said blank, with restricting and separating means located in said chamber, said step of restricting fluid flow with said restricting and separating means comprising separating said chamber into two interconnected chamber parts so that the fluid in one chamber part associates primarily with the piston portion comprising said one draw member and creates a back force on the piston portion of the one draw member greater than the force that would be created on said piston portion of the one draw member only by the resistance of the blank to the drawing action of the ram to thereby provide a controlled holding force of the one draw member on the blank during the drawing operation.
Claim 19
Dependent Claim
224 words
In a method for drawing an article from a blank of material disposed between cooperating draw members and being drawn therefrom by a movable ram moving relative to the draw members and with a single fluid chamber receiving piston portions of one of said draw members and said ram so that relative movement between said one draw member and said fluid chamber in one direction causes the blank drawing movement of said ram by the fluid action between said piston portions in the camber, the improvement comprising the step of restricting fluid flow between said piston portions at least during part of the drawing operation of said ram on said blank, with restricting and separating means located in said chamber, said step of restricting fluid flow with said restricting and separating means comprising separating said chamber into two interconnected chamber parts so that the fluid in one chamber part associates primarily with the piston portion comprising said one draw member and creates a back force on the piston portion of the one draw member greater than the force that would be created on said piston portion of the one draw member only by the resistance of the blank to the drawing action of the ram to thereby provide a controlled holding force of the one draw member on the blank during the drawing operation.
Claim 20
Dependent Claim
39 words
In a method as set forth in claim 16, the further improvement wherein said step of restricting fluid flow between said piston portions comprises the step of varying the size of the restriction with said restricting and separating means.
Claim 21
Dependent Claim
42 words
In a method as set forth in claim 17, the further improvement wherein said step of varying the size of the restriction comprises the step of progressively increasing the size of the restriction during at least said part of said drawing operation.
Claim 22
Dependent Claim
29 words
In a method as set forth in claim 16, the further improvement wherein said part of said drawing operation takes place during the initial part of said drawing operation.
Claim 23
Dependent Claim
33 words
In a method as set forth in claim 19, the further improvement wherein said step of restricting fluid flow does not restrict such fluid flow during the remaining part of said drawing operation.
Claim 24
Dependent Claim
61 words
In a method as set forth in claim 16, the further improvement wherein said step of restricting fluid flow comprises the steps of providing said restricting and separating means as a wall in said chamber which separates said chamber between said piston portions into said two chamber parts, and providing a fixed orifice through said wall interconnecting said chamber parts together.
Claim 25
Dependent Claim
41 words
In a method as set forth in claim 21, the further improvement comprising the step of interconnecting said chamber parts together with a one-way flow device to facilitate return of said ram to its non-drawing position relative to said fluid chamber.
Claim 26
Dependent Claim
74 words
In a method as set forth in claim 16, the further improvement wherein said step of restricting fluid flow comprises the steps of providing said restricting and separating means as cooperating surfaces on said piston portions of said one draw member and said ram which separate said chamber between said piston portions into said two chamber parts, and interconnecting said chamber parts together by the spacing between said surfaces to provide said restricted flow.
Claim 27
Dependent Claim
41 words
In a method as set forth in claim 23, the further improvement comprising the step of interconnecting said chamber parts together with a one-way flow device to facilitate return of said ram to its non-drawing position rElative to said fluid chamber.
Claim 28
Dependent Claim
69 words
In a method as set forth in claim 23, the further improvement comprising the steps of disposing said piston portion of said ram within said piston portion of said one draw member, defining said surface of said ram in the form of a spool, and forming said surface of said one draw member as a ring telescoping with said spool during at least said part of said drawing operation.
Claim 29
Dependent Claim
50 words
In a method as set forth in claim 25, the further improvement comprising the step of forming said spool with a tapering surface to provide for a progressively increasing in the size of the restriction between said spool and said ring during at least said part of said drawing operation.
Claim 30
Dependent Claim
73 words
In a method as set forth in claim 25, the further improvement comprising the step of forming said spool with an outer cylindrical surface disposed coaxial with said ring during the entire telescoping relation therebetween, and forming at least one tapering groove in said cylindrical surface to provide for a progressively increasing in the size of the restriction between said spool and said ring during at least said part of said drawing operation.
Claim 31
Dependent Claim
167 words
In a method for drawing an article from a blank of material disposed between cooperating draw members and being drawn therefrom by a movable ram moving relative to said draw members and with a single fluid chamber receiving piston portions of one of said draw members and said ram whereby relative movement between said fluid chamber and said one draw member in one direction causes the blank drawing movement of said ram by the fluid action between said piston portions in said chamber, the improvement comprising the step of providing restricting and separating means on at least one of said piston portions located in said chamber causing said fluid to create a force on said piston portion of said one draw member greater than the force that would be created on said piston portion of said one draw member by the resistance of said blank to the drawing action of said ram thereon at least during part of the drawing operation of said ram on said blank.
Claim 32
Dependent Claim
167 words
In a method for drawing an article from a blank of material disposed between cooperating draw members and being drawn therefrom by a movable ram moving relative to said draw members and with a single fluid chamber receiving piston portions of one of said draw members and said ram whereby relative movement between said fluid chamber and said one draw member in one direction causes the blank drawing movement of said ram by the fluid action between said piston portions in said chamber, the improvement comprising the step of providing restricting and separating means on at least one of said piston portions located in said chamber causing said fluid to create a force on said piston portion of said one draw member greater than the force that would be created on said piston portion of said one draw member by the resistance of said blank to the drawing action of said ram thereon at least during part of the drawing operation of said ram on said blank.
Claim 33
Dependent Claim
68 words
In a method as set forth in claim 28, the further improvement wherein said part of said drawing operation takes place only during the initial part of said drawing operation so that said step of causing said fluid to create said force on said piston portion said one draw member does not affect the fluid flow between said piston portions during the remaining part of said drawing operation.
Claim 34
Dependent Claim
55 words
In a method as set forth in claim 28, the further improvement wherein said step causing said fluid to create a force on said one piston portion of said one draw member comprises the step of varying the force on said piston portion of said one draw member during said part of said drawing operation.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |