US3653301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drawing press pressure control
Assignee: PAUMIER Inc
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Filing: 1970-07-06
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Granted: 1972-04-04
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Expires: 1990-07-06
Abstract
Abstract A mechanism for controlling the pressure resisting the stroke of a drawing press consists primarily of two fluid actuated control pistons. The drawing stroke is first resisted by only one of the pistons and then, after a predetermined amount of movement, is resisted by both pistons. The time which the stroke is resisted only by the first piston can be varied according to the physical properties of the material being drawn so that undesirable distortions in the article being manufactured are avoided.
Inventors
- 👤 William H Clendenin
- 👤 Thomas B Paumier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:03
CPC Classifications
B; B21; B21D; B21D24/00; B21D24/04; B21D24/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
Apparatus for controlling the resistance to the downward stroke of a drawing press mechanism comprising, a first cylinder, a second cylinder aligned therewith, said first and second cylinders having a common wall between them, first piston means movable within said first cylinder, second piston means movable within said second cylinder, said first and second cylinder receiving fluid under pressure and means moving said first piston means responsive to the initial downward movement of the press against the fluid pressure in said first cylinder, said first piston means thereafter extending through said common wall to contact said second piston means, said second piston means being responsive to the movement of said first piston means so that continued movement of the press is resisted by fluid pressure acting against said first and second piston means.
Claim 2
Dependent Claim
133 words
Apparatus for controlling the resistance to the downward stroke of a drawing press mechanism comprising, a first cylinder, a second cylinder aligned therewith, said first and second cylinders having a common wall between them, first piston means movable within said first cylinder, second piston means movable within said second cylinder, said first and second cylinder receiving fluid under pressure and means moving said first piston means responsive to the initial downward movement of the press against the fluid pressure in said first cylinder, said first piston means thereafter extending through said common wall to contact said second piston means, said second piston means being responsive to the movement of said first piston means so that continued movement of the press is resisted by fluid pressure acting against said first and second piston means.
Claim 3
Dependent Claim
22 words
Apparatus according to claim 1 having means to adjust the position of said second piston means relative to said first piston means.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 1 including means to provide a fluid under pressure to both said first and second piston means within said first and second cylinders.
Claim 5
Dependent Claim
25 words
Apparatus according to claim 3 wherein said second piston means has a larger area exposed to said fluid under pressure than said first piston means.
Claim 6
Dependent Claim
84 words
Apparatus according to claim 3 wherein the exposed area of said first piston means is such that the force on said first piston means is in the range of 2,320 to 4,480 pounds and the exposed area of said first and second piston means is such that the total force on said first and second piston means is in the range of 5,360 to 7,520 pounds to draw an H19 aluminum alloy having a tensile strength in the range of 33,000 to 42,000 pounds.
Claim 7
Dependent Claim
84 words
Apparatus according to claim 3 wherein the exposed area of said first piston means is such that the force on said first piston means is in the range of 480 to 1,340 pounds and the exposed area of said first and second piston means is such that the total force on said first and second piston means is in the range of 1,450 to 3,350 pounds to draw an ABS plastic material having a tensile strength in the range of 1,540 to 1,840 pounds.
Claim 8
Dependent Claim
21 words
Apparatus according to claim 1 wherein said second piston means is adjustably movable toward and away from said first piston means.
References Cited (Backward Citations)
US1602411A
Cited
US1773439A
Cited
US2584339A
Cited
US3130963A
Cited
US3447795A
Cited
US3451667A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |