US3613490A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Punching presses
Assignee: C Behrens AG
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Filing: 1969-02-18
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Granted: 1971-10-19
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Expires: 1989-02-18
Abstract
Abstract A punching press comprising transmission means having an energyabsorbing resilient portion adapted to be compressed during a punching operation after the stripper assembly contacts a workpiece to be punched.
Inventors
- 👤 Walter Bredow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:25
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/12; B21D45/00; B21D45/003; B21D45/006; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/2135; Y10T83/2142; Y10T83/2163; Y10T83/566; Y10T83/5669; Y10T83/5787; Y10T83/5796; Y10T83/748; Y10T83/7487; Y10T83/7533; Y10T83/869; Y10T83/8727; Y10T83/8732
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
158 words
A punching press comprising an upper rotary punch carrier with a plurality of punches mounted thereon and a lower rotary punch carrier journaled coaxially therewith, each punch having an individual associated stripper mechanism including an individual holddown disc for movement independently of the punch movement and for movement independently of the other individual stripper mechanisms to strip a punched article from the punch on completion of a punching operation, rotary drive means, means for converting rotation of the drive means into reciprocation of a single punch, means drivingly connected with the drive means and transmission means for converting rotation of the drive means into reciprocation of the stripper mechanism, said transmission means having an energy absorbing resilient portion prestressed between yokes and a frame, said resilient portion adapted to be compressed only to a comparatively small extent corresponding to the stripping force required during a punching operation after the stripper assembly contacts a work piece to be punched.
Claim 2
Dependent Claim
158 words
A punching press comprising an upper rotary punch carrier with a plurality of punches mounted thereon and a lower rotary punch carrier journaled coaxially therewith, each punch having an individual associated stripper mechanism including an individual holddown disc for movement independently of the punch movement and for movement independently of the other individual stripper mechanisms to strip a punched article from the punch on completion of a punching operation, rotary drive means, means for converting rotation of the drive means into reciprocation of a single punch, means drivingly connected with the drive means and transmission means for converting rotation of the drive means into reciprocation of the stripper mechanism, said transmission means having an energy absorbing resilient portion prestressed between yokes and a frame, said resilient portion adapted to be compressed only to a comparatively small extent corresponding to the stripping force required during a punching operation after the stripper assembly contacts a work piece to be punched.
Claim 3
Dependent Claim
38 words
A press as claimed in claim 1 wherein said transmission means for the stripper mechanism are driven by cam means which lead the motion of the punching tool just before reaching the die surface of the blank material.
Claim 4
Dependent Claim
32 words
A press as claimed in claim 1, wherein said resilient portion of said transmission means for the stripper mechanism is held and guided in a casing fixed to the outer machine frame.
Claim 5
Dependent Claim
29 words
A press as claimed in claim 1, wherein the resilient portion of the transmission means comprises a plurality of resilient members disposed symmetrically around a guide for the ram.
Claim 6
Dependent Claim
21 words
A press as claimed in claim 1, wherein the resilient portion of the transmission means includes a stack of resilient elements.
Claim 7
Dependent Claim
53 words
A press as claimed in claim 1, wherein the resilient portion of the transmission means is accommodated between a pair of relatively movable members one of which members carries a pin or pins adapted to slide during compression of said resilient portion in a guide formed in a part of the press frame.
Claim 8
Dependent Claim
28 words
A press as claimed in claim 6, wherein each pin terminates in a bearing carrying a roller for rolling a follower for a cam of said cam means.
Claim 9
Dependent Claim
21 words
A press as claimed in claim 7, further comprising spring means urging each roller into surface contact with its associated cam.
Claim 10
Dependent Claim
20 words
A press as claimed in claim 1, in which the resilient portion of the transmission means has a residual stress.
Claim 11
Dependent Claim
21 words
A press as claimed in claim 1, in which each stripper mechanism is spring-urged towards a face of the punch carrier.
Claim 12
Dependent Claim
57 words
A press as claimed in claim 2, wherein the punch carrier comprises a rotatable disc carrying a plurality of punches each having an associated stripper mechanism, the punches with their associated stripper mechanism being capable of selective alignment with a punch operating ram connected to the drive means by suitable positioning of the disc about its axis.
Claim 13
Dependent Claim
50 words
A press as claimed in claim 1, wherein the holding down and stripping disc is connected to guide pillars with return springs driven by a frame and so arranged that the disc is held in its rest position in contact with the lower face of the rotary upper punch disc.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |