US3797358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blind fastener with prismatic body
Assignee: Individual
•
Filing: 1972-07-25
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Granted: 1974-03-19
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Expires: 1992-07-25
Abstract
Abstract A one-piece blind fastener, of the kind which serves as a nut plate, has a head to bear against the exposed face of a structural member having a hole in it, and a prismatic hollow body having preferably four to six flat faces to pass through the hole. The middle part of the body is divided longitudinally into as many strips as it has faces, and its end remote from the head is internally threaded. The bore of the fastener contains a small step or offset so that the major diameter of bore extends from the outer face of the head to the step, and a slightly smaller diameter of bore extends from the step to the threaded portion. When the fastener is shortened by a pull on a threaded draw rod, the longitudinal strips fold outward at the step and bear firmly against the back or blind face of the structure.
Inventors
- 👤 M Allender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:46
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/04; F16B37/06; F16B37/062; F16B37/065; F16B37/067; F16B13/00; F16B13/04; F16B13/06; F16B13/061
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
202 words
A one-piece blind fastener comprising a head and a prism shaped body integral with the head, the fastener having a longitudinal bore extending through the head and the body and having three sections, the bore of the section farthest from the head being of smallest diameter and being internally threaded, the bore of the central section being of a greater diameter to clear the tips of threads of a screw fitting the internal threads, the bore of the other section being of slightly greater maximum diameter and slightly smaller wall thickness along its length than the central section, in at least several circumferential locations, with an abrupt internal shallow step or offset between it and the central section in the same circumferential locations, the last mentioned section extending from the step to aNd through the head, the portion of the body capable of passing completely through a hole in a structure in which it is to be installed but not including the internally threaded section farthest from the head being of essentially uniform external size and shape and of a length at least approximately as great as its maximum external diameter, and longitudinal slots in the said portion dividing it into strips.
Claim 2
Dependent Claim
202 words
A one-piece blind fastener comprising a head and a prism shaped body integral with the head, the fastener having a longitudinal bore extending through the head and the body and having three sections, the bore of the section farthest from the head being of smallest diameter and being internally threaded, the bore of the central section being of a greater diameter to clear the tips of threads of a screw fitting the internal threads, the bore of the other section being of slightly greater maximum diameter and slightly smaller wall thickness along its length than the central section, in at least several circumferential locations, with an abrupt internal shallow step or offset between it and the central section in the same circumferential locations, the last mentioned section extending from the step to aNd through the head, the portion of the body capable of passing completely through a hole in a structure in which it is to be installed but not including the internally threaded section farthest from the head being of essentially uniform external size and shape and of a length at least approximately as great as its maximum external diameter, and longitudinal slots in the said portion dividing it into strips.
Claim 3
Dependent Claim
24 words
A fastener as in claim 1, in which the numbers of slots is the same as the number of faces of the prismatic body.
Claim 4
Dependent Claim
18 words
A fastener as in claim 2, in which the longitudinal slots are in the center of the faces.
Claim 5
Dependent Claim
21 words
A fastener as in claim 1, in which the prismatic body has not less than four nor more than six faces.
Claim 6
Dependent Claim
14 words
A fastener as in claim 1, in which the prismatic body has four faces.
Claim 7
Dependent Claim
20 words
A fastener as in claim 1, in which each section of the bore other than the threaded section is cylindrical.
Claim 8
Dependent Claim
36 words
A fastener as in claim 1, in which the section of the bore from the step to the head is prism shaped and the wall of the body in that section has an approximately uniform thickness.
Claim 9
Dependent Claim
24 words
A fastener as in claim 7, in which the central section of the bore, from the internally threaded end to the step, is cylindrical.
Claim 10
Dependent Claim
29 words
A fastener as in claim 1, in which the step is approximately midway between the location of the back face of the structure and the internally threaded end section.
Claim 11
Dependent Claim
46 words
A fastener as in claim 7, in which the prismatic body has six faces, the longitudinal slots are in the centers of the faces, and the step is approximately midway between the location of the back face of the structure and the internally threaded end section.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |