US3789728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blind fastener
Assignee: Goodrich Corp
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Filing: 1972-07-25
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Granted: 1974-02-05
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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 cylindrical hollow body to pass through the hole and expand in a flower petal shape against the blind face of the structural member when shortened by pulling up a threaded draw rod. The head and the internally threaded far end are circumferentially continuous, and are integral with the body. The intermediate portion of the body which protrudes through the hole is longitudinally divided into strips and has an internal shallow step or offset about midway of its length.
Inventors
- 👤 J Shackelford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:10
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/04; F16B37/06; F16B37/062; F16B37/065; F16B37/067
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
181 words
A one-piece blind fastener of the type having a head and a tubular body which is integral with the head, is capable of passing through a hole in a structure, and is capable of being reshaped for engagement with the blind surface of the structure by tension on a draw rod insertable and removable through the head, characterized in that: 1. the bore through the body consists of sections of progressively smaller diameter as they are more distant from the head; and 2. the portion of the body capable of being reshaped for engagement with the blind surface of the structure and short of the end engageable by the draw rod: a. has a length at least about as great as its external diameter, b. has a bore of uniform diameter and a wall of uniform thickness for approximately half of its length, and a bore of smaller diameter and a wall of greater thickness for the remainder of its length, establishing an abrupt step in thickness between the two sections, and c. is divided lengthwise into a plurality of strips.
Claim 2
Dependent Claim
181 words
A one-piece blind fastener of the type having a head and a tubular body which is integral with the head, is capable of passing through a hole in a structure, and is capable of being reshaped for engagement with the blind surface of the structure by tension on a draw rod insertable and removable through the head, characterized in that: 1. the bore through the body consists of sections of progressively smaller diameter as they are more distant from the head; and 2. the portion of the body capable of being reshaped for engagement with the blind surface of the structure and short of the end engageable by the draw rod: a. has a length at least about as great as its external diameter, b. has a bore of uniform diameter and a wall of uniform thickness for approximately half of its length, and a bore of smaller diameter and a wall of greater thickness for the remainder of its length, establishing an abrupt step in thickness between the two sections, and c. is divided lengthwise into a plurality of strips.
Claim 3
Dependent Claim
98 words
the portion of the body capable of being reshaped for engagement with the blind surface of the structure and short of the end engageable by the draw rod: a. has a length at least about as great as its external diameter, b. has a bore of uniform diameter and a wall of uniform thickness for approximately half of its length, and a bore of smaller diameter and a wall of greater thickness for the remainder of its length, establishing an abrupt step in thickness between the two sections, and c. is divided lengthwise into a plurality of strips.
Claim 4
Dependent Claim
98 words
the portion of the body capable of being reshaped for engagement with the blind surface of the structure and short of the end engageable by the draw rod: a. has a length at least about as great as its external diameter, b. has a bore of uniform diameter and a wall of uniform thickness for approximately half of its length, and a bore of smaller diameter and a wall of greater thickness for the remainder of its length, establishing an abrupt step in thickness between the two sections, and c. is divided lengthwise into a plurality of strips.
Claim 5
Dependent Claim
29 words
A fastener as in claim 1, in which the end of the body remote from the head is internally threaded to receive the end of a threaded draw rod.
Claim 6
Dependent Claim
32 words
the section of largest bore diameter next to the head has an essentially uniform wall thickness and terminates in a shallow internal step or offset establishing an abrupt reduction in bore diameter,
Claim 7
Dependent Claim
32 words
the section of largest bore diameter next to the head has an essentially uniform wall thickness and terminates in a shallow internal step or offset establishing an abrupt reduction in bore diameter,
Claim 8
Dependent Claim
17 words
the section of next smaller bore diameter adjacent to the step has an essentially uniform wall thickness,
Claim 9
Dependent Claim
17 words
the section of next smaller bore diameter adjacent to the step has an essentially uniform wall thickness,
Claim 10
Dependent Claim
18 words
A fastener as in claim 2, in which the body is cylindrical and of essentially uniform external diameter.
Claim 11
Dependent Claim
35 words
A fastener as in claim 2, in which the body is cylindrical and of essentially uniform external diameter between the head and the internally threaded end, and of reduced external diameter at the threaded end.
Claim 12
Dependent Claim
12 words
a section with a bore of still smaller diameter is internally threaded,
Claim 13
Dependent Claim
12 words
a section with a bore of still smaller diameter is internally threaded,
Claim 14
Dependent Claim
78 words
the section of largest diameter and the section of next smaller diameter are divided lengthwise into a plurality of strips continuously across the location of the step, and a. the strips have a total length at least about as great as the external diameter of the body and b. that part of the strips in the section of smaller bore diameter have a length at least about as great as one-third of the external diameter of the body.
Claim 15
Dependent Claim
78 words
the section of largest diameter and the section of next smaller diameter are divided lengthwise into a plurality of strips continuously across the location of the step, and a. the strips have a total length at least about as great as the external diameter of the body and b. that part of the strips in the section of smaller bore diameter have a length at least about as great as one-third of the external diameter of the body.
Claim 16
Dependent Claim
60 words
A one-piece blind fastener of the type having a head and a tubular body which is integral with the head, is capable of passing through a hole in a structure, and is capable of being reshaped for engagement with the blind surface of the structure by tension on a draw rod insertable and removable through the head, characterized in that:
Claim 17
Dependent Claim
60 words
A one-piece blind fastener of the type having a head and a tubular body which is integral with the head, is capable of passing through a hole in a structure, and is capable of being reshaped for engagement with the blind surface of the structure by tension on a draw rod insertable and removable through the head, characterized in that:
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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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |