US3759130A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Replaceable tip shear proof punch
Assignee: Mate Punch and Die Co
•
Filing: 1972-04-13
•
Granted: 1973-09-18
•
Expires: 1992-04-13
Abstract
Abstract A shear proof punch with heel aligning structure formed as a part of the punch tip retainer but without difficult machining tolerances.
Inventors
- 👤 C Patterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:01
CPC Classifications
B; B21; B21D; B21D28/00; B21D28/02; B21D28/14; Y; Y10; Y10S; Y10S83/00; Y10S83/916; Y10T; Y10T83/00; Y10T83/869; Y10T83/8821; Y10T83/8841; Y10T83/8853; Y10T83/8855; Y10T83/929; Y10T83/9411; Y10T83/9442; Y10T83/9444; Y10T83/9457; Y10T83/9473; Y10T83/9476
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A shearproof punch structure including: A. a retainer portion adapted to be secured to a punch holder during use, B. a tip secured to the retainer in a manner allowing them to be separated when desired, C. heels secured to said tip for limited sliding movement relative thereto, D. means for urging said heels to one limit of movement, and E. heel aligning structure secured to said retainer.
Claim 2
Dependent Claim
68 words
A shearproof punch structure including: A. a retainer portion adapted to be secured to a punch holder during use, B. a tip secured to the retainer in a manner allowing them to be separated when desired, C. heels secured to said tip for limited sliding movement relative thereto, D. means for urging said heels to one limit of movement, and E. heel aligning structure secured to said retainer.
Claim 3
Dependent Claim
19 words
The shear proof punch structure of claim 1 in which the heel aligning structure is spring fingers having pads.
Claim 4
Dependent Claim
29 words
The shear proof punch structure of claim 1 in which the tip is releaseably secured to the retainer by means actuated at the cutting face of the punch tip.
Claim 5
Dependent Claim
44 words
The shear proof punch structure of claim 1 in which the heel aligning structure is spring fingers and the means for securing the heel and tip together is screw thread means that also can force the tip and retainer apart and draw them together.
Claim 6
Dependent Claim
39 words
The shear proof punch structure of claim 1 in which said retainer has a reference surface against which the tip bears when in operable condition and characterized by having the reference surface spaced from the heel aligning structure vertically.
Claim 7
Dependent Claim
41 words
The sheer proof punch structure of claim 5 in which the heel aligning structure is spring fingers having pads and the distance between pads is never greater than the corresponding distance between faces of the tip that the pads will engage.
Claim 8
Dependent Claim
67 words
The sheer proof punch structure of claim 6 in which the tip and retainer are releaseably secured to each other by a cap screw having a groove in it, and a snap ring in said groove that engages said tip when said cap screw is backed off to push said tip from said retainer; said cap screw head being accessible at the cutting face of said tip.
References Cited (Backward Citations)
US3296905A
Cited
US3348443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |