Patent US3779113A successfully refreshed from Google Patents.
US3779113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Punching unit
Assignee: Individual
•
Filing: 1971-08-05
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Granted: 1973-12-18
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Expires: 1991-08-05
Abstract
Abstract A punching unit of the type comprising a C-shaped body has the punch and die disposed coaxially at the outer ends of its arms. A stop member limiting the upward stroke of the external sleeve, having a punch slidably mounted therein is, fitted in a transverse bore formed in the outer end of the upper arm of the body of the punching unit and engages a longitudinal slot formed in said external sleeve. The stop member is retained in said bore by an expansion ring. A striker plate or punch head capping the upper portion of the external sleeve is secured to the flange constituting the upper portion of the sleeve by means of a retaining spring. Thus, the punch can be fitted and removed without resorting to any screwing or unscrewing operation.
Inventors
- 👤 P Jestin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:48
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/24; B21D28/34; Y; Y10; Y10T; Y10T83/00; Y10T83/202; Y10T83/2092; Y10T83/2096; Y10T83/2135; Y10T83/215; Y10T83/2155; Y10T83/2159; Y10T83/869; Y10T83/8776; Y10T83/8785; Y10T83/929; Y10T83/9457; Y10T83/9473; Y10T83/9476
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
291 words
A punching unit comprising a jaw-shaped body of which the upper arm has formed therethrough a vertical cylindrical bore adapted to receive the punch the corresponding die of which is aligned therewith and fitted in the lower arm of said body, a sleeve slidably mounted in said bore, an inner shoulder at the lower portion of said sleeve, a coaxial stripper comprising at its upper portion a flange bearing on said sleeve shoulder, a punch carrier mounted in the upper portion of said sleeve, a punch having its lower portion guided by said stripper and its upper portion provided with an integral head bearing on said punch carrier, a first relatively powerful spring surrounding said punch within said sleeve and bearing at one end against said stripper flange and at its other end against the lower portion of said punch carrier, at least one axially displaced external spring weaker than said first spring and constantly urging said sleeve upwards in said bore, said sleeve having formed therein an elongated longitudinal aperture, a stop member for lImiting the upward stroke of said sleeve which extends through a radial bore formed in said upper arm of said punch unit body, said radial bore opening into said cylindrical bore, an external control knob for actuating said stop member and an inner end portion of said stop member engaging said elongated aperture of said sleeve, the lower edge of said elongated aperture abuting against said inner end portion to limit the upward stroke of said sleeve, and a circlip retaining said punch with respect to the upper portion of said sleeve, and wherein the punch, punch carrier and stripper are simultaneously withdrawable from the bore by the manual removal of the stop member and circlip.
Claim 2
Dependent Claim
291 words
A punching unit comprising a jaw-shaped body of which the upper arm has formed therethrough a vertical cylindrical bore adapted to receive the punch the corresponding die of which is aligned therewith and fitted in the lower arm of said body, a sleeve slidably mounted in said bore, an inner shoulder at the lower portion of said sleeve, a coaxial stripper comprising at its upper portion a flange bearing on said sleeve shoulder, a punch carrier mounted in the upper portion of said sleeve, a punch having its lower portion guided by said stripper and its upper portion provided with an integral head bearing on said punch carrier, a first relatively powerful spring surrounding said punch within said sleeve and bearing at one end against said stripper flange and at its other end against the lower portion of said punch carrier, at least one axially displaced external spring weaker than said first spring and constantly urging said sleeve upwards in said bore, said sleeve having formed therein an elongated longitudinal aperture, a stop member for lImiting the upward stroke of said sleeve which extends through a radial bore formed in said upper arm of said punch unit body, said radial bore opening into said cylindrical bore, an external control knob for actuating said stop member and an inner end portion of said stop member engaging said elongated aperture of said sleeve, the lower edge of said elongated aperture abuting against said inner end portion to limit the upward stroke of said sleeve, and a circlip retaining said punch with respect to the upper portion of said sleeve, and wherein the punch, punch carrier and stripper are simultaneously withdrawable from the bore by the manual removal of the stop member and circlip.
Claim 3
Dependent Claim
83 words
A punching unit as set forth in claim 1, wherein said die is an easy fit in a bore formed with a shoulder engageable by the lower face of said die, said bore being formed in the end of the lower arm of the punching unit body and comprising a radial notch extending longitudinally to a lower level than said shoulder to permit the removal of said die by lever means comprising the circlip the circlip engaging the notch formed beneath the die.
Claim 4
Dependent Claim
201 words
A punching unit comprising: a jaw-shaped body having an upper arm and lower arm, the upper arm being provided with a vertical bore adapted to receive a punch and a radial bore in communication with the vertical bore, the lower arm adapted to receive a die, an external sleeve slidably mounted in the vertical bore, and having a longitudinal slot formed therein, a stripper concentrically disposed interiorly of and seatingly engaging the sleeve, a punch disposed in the vertical bore and guided by the stripper, means for carrying the punch mounted in the sleeve, and including means for retaining the punch in the sleeve, biasing means interposed between the stripper and the punch-carrying means, an axially displaced external biasing means for constantly urging the sleeve upwards in the bore, the external biasing means being weaker than the biasing means interposed between the stripper and punch-carrying means, a stop member normally extending through the radial bore into the vertical bore and terminating at the longitudinal slot and wherein the stripper means for carrying the punch and the punch are simultaneously removed from the sleeve by the manual removal of the stop member and the means for retaining the punch in the sleeve.
Claim 5
Dependent Claim
201 words
A punching unit comprising: a jaw-shaped body having an upper arm and lower arm, the upper arm being provided with a vertical bore adapted to receive a punch and a radial bore in communication with the vertical bore, the lower arm adapted to receive a die, an external sleeve slidably mounted in the vertical bore, and having a longitudinal slot formed therein, a stripper concentrically disposed interiorly of and seatingly engaging the sleeve, a punch disposed in the vertical bore and guided by the stripper, means for carrying the punch mounted in the sleeve, and including means for retaining the punch in the sleeve, biasing means interposed between the stripper and the punch-carrying means, an axially displaced external biasing means for constantly urging the sleeve upwards in the bore, the external biasing means being weaker than the biasing means interposed between the stripper and punch-carrying means, a stop member normally extending through the radial bore into the vertical bore and terminating at the longitudinal slot and wherein the stripper means for carrying the punch and the punch are simultaneously removed from the sleeve by the manual removal of the stop member and the means for retaining the punch in the sleeve.
Claim 6
Dependent Claim
48 words
The unit of claim 3 wherein the stop member includes an external control knob for actuating the stop member and an inner end portion which engages the longitudinal slot, the lower edge of the slot abutting against the end portion to limit the upward stroke of the sleeve.
Claim 7
Dependent Claim
28 words
The unit of claim 3 wherein the means for carrying the punch includes a striker plate and a counter-punch, the head of the punch bearing against the counter-punch.
Claim 8
Dependent Claim
32 words
The unit of claim 3 wherein the lower arm is provided with a radial bore notch extending from the bore and a shoulder, the notch being axially lowerly displaced from the shoulder.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |