Patent US3990291A successfully refreshed from Google Patents.
US3990291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bending machine for bending sheet and strip
Assignee: Individual
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Filing: 1975-04-08
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Granted: 1976-11-09
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Expires: 1995-04-08
Abstract
Abstract A bending apparatus for bending individual sheet and strip blanks and having a bending punch curved to a radius less than the desired bending radius. Tip-supports are arranged at either side of the punch and are pivotable in the bending plane. Each support has a supporting pad for holding the blank and the pivotal articulations of the supports are arranged beneath the pads and spaced horizontally from the edges of the pads facing the punch.
Inventors
- 👤 Egon Evertz
- 👤 Rolf Seybold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:48
CPC Classifications
B; B21; B21D; B21D5/00; B21D5/01; B21D5/02; B21D5/0209; B21D5/0263
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
172 words
Bending apparatus for bending sheet and strip, comprising a bending punch movable through a punch plane, said bending punch having a working end elongated in said punch plane and curved in cross section, a pair of supports disposed respectfully at either side of said punch plane, said supports each having a planar support surface elongated in the direction of said bending punch working end and adapted to support a sheet or strip for engagement by said punch working end, said supports each being pivotable about first and second axes disposed in planes transverse to said punch plane and to each other, said bending punch being adjustable in said punch plane to dispose said working end parallel to and at oblique angles relative to said supported sheet or strip, whereby said supports are adapted to pivot to conform to the supported sheet or strip during bending, and to facilitate conical bending of said sheet or strip when said bending punch working end is disposed at an angle relative to said sheet or strip.
Claim 2
Dependent Claim
172 words
Bending apparatus for bending sheet and strip, comprising a bending punch movable through a punch plane, said bending punch having a working end elongated in said punch plane and curved in cross section, a pair of supports disposed respectfully at either side of said punch plane, said supports each having a planar support surface elongated in the direction of said bending punch working end and adapted to support a sheet or strip for engagement by said punch working end, said supports each being pivotable about first and second axes disposed in planes transverse to said punch plane and to each other, said bending punch being adjustable in said punch plane to dispose said working end parallel to and at oblique angles relative to said supported sheet or strip, whereby said supports are adapted to pivot to conform to the supported sheet or strip during bending, and to facilitate conical bending of said sheet or strip when said bending punch working end is disposed at an angle relative to said sheet or strip.
Claim 3
Dependent Claim
229 words
A bending apparatus for bending sheet and strip, comprising a bending punch movable through a punch plane, said bending punch having a working end elongated in said punch plane and curved in cross section, a pair of supports disposed respectively at either side of said punch plane, said supports each having a planar support surface elongated in the direction of said bending punch working end and adapted to support a sheet or strip for engagement by said punch working end, said supports each being pivotable about first axes extending in the direction of said bending punch working end and disposed in a plane transverse to said punch plane, said supports also being pivotable about second axes extending in the direction of said punch plane end and disposed in a plane transverse to said punch plane and said first mentioned pivotal axis plane, said bending punch being adjustable in said punch plane to dispose said working end parallel to and at oblique angles relative to said supported sheet or strip, whereby said supports are adapted to pivot about said first axes to conform to the supported sheet or strip during bending, and whereby said supports are pivotally adjustable about said second axes to facilitate conical bending of said sheet or strip when said bending punch working end is disposed at an oblique angle realtive to said supported sheet or strip.
Claim 4
Dependent Claim
229 words
A bending apparatus for bending sheet and strip, comprising a bending punch movable through a punch plane, said bending punch having a working end elongated in said punch plane and curved in cross section, a pair of supports disposed respectively at either side of said punch plane, said supports each having a planar support surface elongated in the direction of said bending punch working end and adapted to support a sheet or strip for engagement by said punch working end, said supports each being pivotable about first axes extending in the direction of said bending punch working end and disposed in a plane transverse to said punch plane, said supports also being pivotable about second axes extending in the direction of said punch plane end and disposed in a plane transverse to said punch plane and said first mentioned pivotal axis plane, said bending punch being adjustable in said punch plane to dispose said working end parallel to and at oblique angles relative to said supported sheet or strip, whereby said supports are adapted to pivot about said first axes to conform to the supported sheet or strip during bending, and whereby said supports are pivotally adjustable about said second axes to facilitate conical bending of said sheet or strip when said bending punch working end is disposed at an oblique angle realtive to said supported sheet or strip.
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) | 1979-11-09 | 1980-05-10 | 1980-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-09 | 1984-05-10 | 1984-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-09 | 1988-05-10 | 1988-11-09 | $7700.00 | Window Closed / Lapsed |