US3677009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control arrangement for the male die of a hydraulic press brake
Assignee: KELSO MARINE Inc
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Filing: 1970-11-12
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Granted: 1972-07-18
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Expires: 1990-11-12
Abstract
Abstract A control arrangement for maintaining the male die of a hydraulic press brake aligned in a predetermined relationship relative to its longitudinal axis during metal braking operations so as to compensate for variations in the resistance to being formed in the metal work piece to thereby maintain the male die properly aligned longitudinally and inhibit erratic bending of the metal work piece and possible die damage.
Inventors
- 👤 Russell S Thatcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:22
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/16; B30B15/24; B21; B21D; B21D37/00; B21D37/10; B21D37/12; B21D5/00; B21D5/02; B30B15/007; F; F15; F15B; F15B11/00; F15B11/16; F15B11/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
182 words
A control arrangement for maintaining the male die of a hydraulic press brake aligned in a predetermined relationship relative to its longitudinal axis during metal braking operations comprising: a. pump means for connecting with a liquid reservoir; b. positive liquid displacement means for receiving the liquid flow from said pump means to divide the liquid flow into a plurality of streams os substantially equal liquid displacement; c. a plurality of double acting hydraulic cylinder and piston means spaced longitudinally of the male die and each of said cylinder and piston means communicating with a separate stream from the plurality of streams; d. piston rod means for connecting said piston means and the male die to raise and lower the male die; e. indicating means associated with the male die at spaced intervals therealong indicating the vertical movement of the male die; and f. by-pass valve means to selectively bypass the liquid stream from any of said hydraulic cylinder and piston means in an amount to maintain the male die aligned in a predetermined relationship to its longitudinal axis during metal braking operations.
Claim 2
Dependent Claim
182 words
A control arrangement for maintaining the male die of a hydraulic press brake aligned in a predetermined relationship relative to its longitudinal axis during metal braking operations comprising: a. pump means for connecting with a liquid reservoir; b. positive liquid displacement means for receiving the liquid flow from said pump means to divide the liquid flow into a plurality of streams os substantially equal liquid displacement; c. a plurality of double acting hydraulic cylinder and piston means spaced longitudinally of the male die and each of said cylinder and piston means communicating with a separate stream from the plurality of streams; d. piston rod means for connecting said piston means and the male die to raise and lower the male die; e. indicating means associated with the male die at spaced intervals therealong indicating the vertical movement of the male die; and f. by-pass valve means to selectively bypass the liquid stream from any of said hydraulic cylinder and piston means in an amount to maintain the male die aligned in a predetermined relationship to its longitudinal axis during metal braking operations.
Claim 3
Dependent Claim
27 words
The invention of claim 1 wherein said liquid displacement means comprises positive displacement hydraulic motors which are mutually connected so that all move the same angular distance.
Claim 4
Dependent Claim
59 words
The invention of claim 1 wherein said hydraulic cylinder and piston means comprises a plurality of groups of hydraulic cylinders and pistons spaced longitudinally of the male die with each of said groups containing the same number of hydraulic cylinders and pistons with the total number of hydraulic cylinders and pistons being divisible by the total number of groups.
Claim 5
Dependent Claim
57 words
The invention of claim 3 including a main shut off valve between said positive liquid displacement means and each of said groups of hydraulic cylinder and piston means which may be actuated to shut off flow to the group of hydraluic cylinder and piston means with which the liquid flow through said main shut off valve communicates.
Claim 6
Dependent Claim
11 words
The invention of claim 1 wherein said hydraulic motors are reversible.
Claim 7
Dependent Claim
63 words
The invention of claim 1 including control valve means between said pump means and said liquid displacement means, and conduit means connected with said control valve means and said hydraulic cylinder and piston means whereby when said control valve means is shifted to communicate liquid from said pump means to said conduit means, said piston and piston rod means raises the male die.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |