US3704644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Punching machine-tools
Assignee: Individual
•
Filing: 1970-04-21
•
Granted: 1972-12-05
•
Expires: 1990-04-21
Abstract
Abstract This invention relates to an improvement in punching machine tools comprising a frame in which is mounted a slide carrying at one of its ends a punching tool and connected at its other end to hydraulic control means, wherein a plurality of small diameter hydraulic cylinders are mounted on the frame of the machine which has a relatively small front width, in which cylinders pistons unitary with the slide are slidably mounted, said cylinders having their axes located in the same plane extending along the largest dimension of the frame.
Inventors
- 👤 Jean Cloup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:55
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; Y; Y10; Y10T; Y10T83/00; Y10T83/869; Y10T83/8821; Y10T83/8858; Y10T83/8864
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
An improvement in hydraulic punching machine-tools comprising a frame in which is mounted a slide carrying at one of its ends a punching tool and connected at its other end to hydraulic control means, wherein a plurality of small diameter hydraulic cylinders are mounted on the frame of the machine which has a relatively small front width, in which cylinders pistons unitary with the slide, are slidably mounted, said cylinders having their axes located in the same plane extending along the largest dimension of the frame and said slide having in its upper part a T-rib which is engaged in a corresponding groove provided at one of the ends of said pistons, whereby hydraulic fluid from the hydraulic control means acts on the pistons so as to drive the punch by means of the slide and then return the punch by reduction in the fluid pressure.
Claim 2
Dependent Claim
146 words
An improvement in hydraulic punching machine-tools comprising a frame in which is mounted a slide carrying at one of its ends a punching tool and connected at its other end to hydraulic control means, wherein a plurality of small diameter hydraulic cylinders are mounted on the frame of the machine which has a relatively small front width, in which cylinders pistons unitary with the slide, are slidably mounted, said cylinders having their axes located in the same plane extending along the largest dimension of the frame and said slide having in its upper part a T-rib which is engaged in a corresponding groove provided at one of the ends of said pistons, whereby hydraulic fluid from the hydraulic control means acts on the pistons so as to drive the punch by means of the slide and then return the punch by reduction in the fluid pressure.
Claim 3
Dependent Claim
42 words
Improvement in punching machine-tools as defined in claim 1, wherein the hydraulic cylinders are bored in a unit fixed to the frame and are fed with hydraulic fluid under pressure at their ends through two conduits in communication with all the cylinders.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |