US3640167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Punching apparatus
Assignee: Maschinenfabrik Lorenz AG
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Filing: 1970-06-15
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Granted: 1972-02-08
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Expires: 1990-06-15
Abstract
Abstract A punching apparatus in which two tool portions come together to punch out a workpiece. At least one tool portion is mounted on a cylinder housing with one part of that tool portion fixed relative to the cylinder housing and another part movable relative to the cylinder housing. Such movement of the tool parts is provided by inner and outer piston systems in the cylinder housing. Either piston system can be fixed to the cylinder housing while the other remains movable relative to the cylinder housing. The movable part of the tool portion can be connected to either piston system, depending on which is arranged to be movable relative to the cylinder housing.
Inventors
- 👤 Adam Axtmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:13
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/16; Y; Y10; Y10T; Y10T83/00; Y10T83/566; Y10T83/5669; Y10T83/5715; Y10T83/5787; Y10T83/5805; Y10T83/869; Y10T83/8821; Y10T83/8835; Y10T83/8858
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
174 words
A punching apparatus comprising, a frame, first and second ram systems mounted on said frame for relative movement axially towards and away from each other, means on each of said ram systems for holding a portion of a punching tool such that when the two ram systems are brought together the two tool portions cooperate with each other to punch a workpiece, at least said first ram system comprising a cylinder housing, inner and outer relatively movable coaxial piston systems mounted in the cylinder housing, each piston system operatively connected to at least one part of the tool of the first ram system, said inner and outer piston systems being constructed such that either one of them can be fixed to the cylinder housing to prevent movement of that fixed piston system relative to the cylinder housing while the other piston system is movable relative to the cylinder housing, whereby relative movement of the inner and outer piston systems assist in the punching of the workpiece when the two ram systems are brought together.
Claim 2
Dependent Claim
174 words
A punching apparatus comprising, a frame, first and second ram systems mounted on said frame for relative movement axially towards and away from each other, means on each of said ram systems for holding a portion of a punching tool such that when the two ram systems are brought together the two tool portions cooperate with each other to punch a workpiece, at least said first ram system comprising a cylinder housing, inner and outer relatively movable coaxial piston systems mounted in the cylinder housing, each piston system operatively connected to at least one part of the tool of the first ram system, said inner and outer piston systems being constructed such that either one of them can be fixed to the cylinder housing to prevent movement of that fixed piston system relative to the cylinder housing while the other piston system is movable relative to the cylinder housing, whereby relative movement of the inner and outer piston systems assist in the punching of the workpiece when the two ram systems are brought together.
Claim 3
Dependent Claim
85 words
A punching apparatus according to claim 1, the tool portion of the said first ram system including an annular outer matrix, an annular raised ridge on said outer matrix projecting therefrom toward the second ram system, whereby when a workpiece is placed between the two tool portions of the ram systems, and when the tool portions are brought together, the annular ridge is impressed in the workpiece material before the punching begins to prevent the workpiece from being pulled inwardly from said matrix during punching.
Claim 4
Dependent Claim
104 words
A punching apparatus according to claim 2, including means for operatively connecting said outer matrix to the outer piston system for movement therewith during punching when the outer piston system is arranged to be movable relative to the cylinder housing, and for operatively connecting the outer matrix to the inner piston system for movement therewith during punching when the inner piston system is arranged to be movable relative to the cylinder housing, and for operatively connecting the outer matrix to the inner piston system for movement therewith during punching when the inner piston system is arranged to be movable relative to the cylinder housing.
Claim 5
Dependent Claim
45 words
A punching apparatus according to claim 3, wherein the means for operatively connecting the outer matrix with the outer piston system includes a toolholder supporting the matrix radially and axially, and means for operatively connecting the toolholder to the outer piston system for movement therewith.
Claim 6
Dependent Claim
71 words
A punching apparatus according to claim 4, including an inner matrix, means for operatively connecting the inner matrix with the outer piston system for movement therewith when the outer matrix is connected to the outer piston system for movement therewith, said inner and outer matrixes being separated by a punching member operatively connected to the inner piston system such that the punching member does not move relative to the cylinder housing.
Claim 7
Dependent Claim
56 words
A punching member according to claim 3, wherein the means for operatively connecting the outer matrix with the inner piston system includes thrust pins acting as spacing elements between the outer matrix and the inner piston system such that the outer matrix moves with the inner piston system when the two ram systems are brought together.
Claim 8
Dependent Claim
71 words
A punching apparatus according to claim 6 including an inner matrix, means for operatively connecting the inner matrix with the inner piston system for movement therewith when the outer matrix is connected to the inner piston system for movement therewith, said inner and outer matrixes being separated by a punching member operatively connected to the outer piston system such that the punching member does not move relative to the cylinder housing.
Claim 9
Dependent Claim
31 words
A punching apparatus according to claim 1 including a stop member connected to the cylinder housing and arranged to limit movement of the outer piston system relative to the cylinder housing.
Claim 10
Dependent Claim
73 words
A punching apparatus according to claim 1 wherein said air piston system comprises an axially extending piston having a pistonhead in a cylinder formed in the cylinder housing and including a first piston rod extending from the piston towards the tool portion and including a rear piston rod extending from the piston in a direction opposite from the tool portion, and including means for fixing the rear piston rod to the cylinder housing.
Claim 11
Dependent Claim
39 words
A punching apparatus according to claim 9 wherein said outer piston system comprises an annular piston surrounding the front piston rod of the inner piston, and including means for rigidly connecting the outer annular piston to the cylinder housing.
Claim 12
Dependent Claim
82 words
A punching press according to claim 10 including a first fluid passage for delivering fluid to the cylinder housing when the outer piston member is fixed to the cylinder housing, and including a second fluid passage for delivering fluid to the cylinder housing when the air piston member is fixed to the cylinder housing, and including a switch for delivering pressurized fluid to either one of said passages depending on which of said piston systems is fixed relative to the cylinder housing.
References Cited (Backward Citations)
US2586695A
Cited
US3084580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |