Patent US3705512A successfully refreshed from Google Patents.
US3705512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bending tool for bending deformable workpieces, such as metal sheets and the like
Assignee: MAN AG
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Filing: 1971-01-27
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Granted: 1972-12-12
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Expires: 1991-01-27
Abstract
Abstract A device for bending deformable workpieces, especially metal sheets, in which in the path of movement of the male die below a holding jaw on opposite sides of said die there is provided an elastic counter bearing each respectively located in recess means adjacent the mold bottom through which extend a reciprocable piston operable both as counterpressure plate during the shaping action of said die and as an ejector at the end of said shaping action, said elastic bearing means extending into the path of movement of said die prior to its shaping operation and being elastically displaceable by said die during its shaping operation into said recess means adjacent the mold bottom.
Inventors
- 👤 Karl Koschatzky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:35
CPC Classifications
B; B21; B21D; B21D5/00; B21D5/01; B21D22/00; B21D22/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
293 words
A device for bending deformable workpieces into accurate Uform out of flat plates, especially metal sheets, which includes in combination: supporting means, mold means supported by said supporting means and having a cavity adapted to receive the workpiece while it is being deformed, a portion of said cavity being defined by a mold bottom having an opening therethrough, elastic counter bearing means supported by said bottom and arranged around that end of said bore which is adjacent said bottom, said elastic counter bearing means during bending procedure being effective upon the workpiece only in the range of workpiece bending edges, jaw means detachably connected to said mold for holding said elastic counter bearing means connected to said mold, piston means reciprocable in said bore and operable to act both as counterpressure member and as ejector, male die means arranged substantially coaxially with regard to said piston means and operable to enter said mold and to move between said elastic counter bearing means to thereby deform a workpiece placed between said die means and said mold, at least those lateral edges of said die means being rounded which during the deforming operation engage said elastic counter bearing means, said die means having inwardly bent side surfaces at an incline to compensate return springiness and opening during subsequent annealing procedure and having a level bottom surface, and power means respectively operatively connected to said piston means and said die means for actuating the same being pressed against the workpiece to such an extent that pressure of said die means exceeds the pressure exerted by said piston means over the entire length thereby to assure a completely even bottom surface, said opening and said piston means extending over the length of the workpiece to be formed.
Claim 2
Independent Claim
293 words
A device for bending deformable workpieces into accurate Uform out of flat plates, especially metal sheets, which includes in combination: supporting means, mold means supported by said supporting means and having a cavity adapted to receive the workpiece while it is being deformed, a portion of said cavity being defined by a mold bottom having an opening therethrough, elastic counter bearing means supported by said bottom and arranged around that end of said bore which is adjacent said bottom, said elastic counter bearing means during bending procedure being effective upon the workpiece only in the range of workpiece bending edges, jaw means detachably connected to said mold for holding said elastic counter bearing means connected to said mold, piston means reciprocable in said bore and operable to act both as counterpressure member and as ejector, male die means arranged substantially coaxially with regard to said piston means and operable to enter said mold and to move between said elastic counter bearing means to thereby deform a workpiece placed between said die means and said mold, at least those lateral edges of said die means being rounded which during the deforming operation engage said elastic counter bearing means, said die means having inwardly bent side surfaces at an incline to compensate return springiness and opening during subsequent annealing procedure and having a level bottom surface, and power means respectively operatively connected to said piston means and said die means for actuating the same being pressed against the workpiece to such an extent that pressure of said die means exceeds the pressure exerted by said piston means over the entire length thereby to assure a completely even bottom surface, said opening and said piston means extending over the length of the workpiece to be formed.
Claim 3
Dependent Claim
31 words
A device in combination according to claim 1, in which said die means has a trapezoidal cross section with the smaller side of the trapezoid facing away from said mold bottom.
Claim 4
Dependent Claim
74 words
A device in combination according to claim 2, in which the cavity of said mold adjacent said bottom includes recess means containing said elastic counter bearing means, said counter bearing means normally extending partially into the forming path of said die means and only partially into said recess means and being elastically deformable and displaceable by said die means out of the path of movement of the latter and further into said recess means.
Claim 5
Dependent Claim
26 words
A device in combination according to claim 3, in which the length of said recess means corresponds to the length of the workpiece to be deformed.
Claim 6
Dependent Claim
29 words
A device in combination according to claim 4, in which said elastic counter bearing means extend over the length of said recess means in the form of rubber balls.
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |