Patent US3763690A successfully refreshed from Google Patents.
US3763690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Press brake ram leveling
Assignee: DREIS AND KRUMP MANUF CO
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Filing: 1972-04-17
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Granted: 1973-10-09
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Expires: 1992-04-17
Abstract
Abstract A press brake having a ram leveling adjustment in its ram advancing means is disclosed. Adjustment can be made even though tooling is secured to the bed and ram. In a preferred embodiment, the mechanical portion of the ram advancing means includes substantially parallel, linked bell cranks, each having a pivot, and at least one of the pivots inludes an eccentric pivot pin which can be rotated to a desired position for ram leveling adjustment. Preferably the orientation of the eccentric pivot pin is adjusted, and secured after adjustment, by means of a manually operable gear system which is self-locking with respect to forces applied at the pivot pin.
Inventors
- 👤 J Kirincic
- 👤 R Heitner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:13
CPC Classifications
B; B21; B21D; B21D5/00; B21D5/02; B23; B23D; B23D33/00; B23D35/00; B23D35/005; B30; B30B; B30B15/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A press brake comprising hydraulic-mechanical power means for advancing and returning a ram, said power means including a plurality of bell cranks pivotally supported by a frame, at least one of said bell cranks being pivotally supported on an eccentric portion of an operator rotatable shaft rotatably supported on said frame.
Claim 2
Dependent Claim
51 words
A press brake comprising hydraulic-mechanical power means for advancing and returning a ram, said power means including a plurality of bell cranks pivotally supported by a frame, at least one of said bell cranks being pivotally supported on an eccentric portion of an operator rotatable shaft rotatably supported on said frame.
Claim 3
Dependent Claim
33 words
The press brake of claim 1 wherein said shaft is attached to gear means for rotating said shaft, said gear means being self-locking with respect to forces applied to it from said shaft.
Claim 4
Dependent Claim
51 words
The press brake of claim 1 in which said shaft has worm gear means operably connected therewith, said worm gear means including a worm wheel gear fixed with respect to said shaft, and including a worm gear operably engaging said worm wheel gear, and handle means for rotating said worm gear.
Claim 5
Dependent Claim
24 words
The press brake of claim 3 in which said shaft has indicator means fixed thereto to correspond to predetermined position adjustment of said ram.
Claim 6
Dependent Claim
196 words
A press brake comprising a rigid frame, a bed, a ram, and driving means for advancing and returning the ram, limit means for limiting the length of travel of the ram while advancing and returning, said driving means comprising double acting hydraulic cylinder means for extending and retracting a piston rod, said ram being supported at a plurality of points by respective lengths pivotally attached to respective first levers of respective bell cranks, said bell cranks being pivotally connected to said frame on respective pivot shafts, said bell cranks being connected to each other by connecting rod means at second lever arms of said bell crank, said first lever arms being substantially identical, and each of said second lever arms being substantially identical, and the angle between respective first and second lever arms being identical, one of said bell cranks including an extending arm portion pivotally secured to said piston rod, at least one of said bell crank pivot shafts having an eccentric portion supporting the respective bell crank, said shaft having gearing means for rotation of said eccentric portion, said gearing means being self-locking with respect to forces applied to it from said eccentric portion.
Claim 7
Dependent Claim
196 words
A press brake comprising a rigid frame, a bed, a ram, and driving means for advancing and returning the ram, limit means for limiting the length of travel of the ram while advancing and returning, said driving means comprising double acting hydraulic cylinder means for extending and retracting a piston rod, said ram being supported at a plurality of points by respective lengths pivotally attached to respective first levers of respective bell cranks, said bell cranks being pivotally connected to said frame on respective pivot shafts, said bell cranks being connected to each other by connecting rod means at second lever arms of said bell crank, said first lever arms being substantially identical, and each of said second lever arms being substantially identical, and the angle between respective first and second lever arms being identical, one of said bell cranks including an extending arm portion pivotally secured to said piston rod, at least one of said bell crank pivot shafts having an eccentric portion supporting the respective bell crank, said shaft having gearing means for rotation of said eccentric portion, said gearing means being self-locking with respect to forces applied to it from said eccentric portion.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |