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US3698279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion fastener
Assignee: Expandet SA
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Filing: 1971-02-23
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Granted: 1972-10-17
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Expires: 1991-02-23
Abstract
Abstract A blind fastener has an elongated body of polygonal crosssection with a plurality of longitudinally extending laterally projecting ribs formed at the corners of its sides. These ribs bite into the wall of a bore when the fastener is inserted therein. The short leg of each of a plurality of J-shaped arms is connected to the end of the fastener opposite its head and the long leg of each arm is formed with its own head so that on insertion of the fastener into the bore the short legs are bent out and the long legs lie against the blind side of a panel. The ribs are longitudinally ridged and the fastener is made of a deformable synthetic-resin material so that a screw inserted into the tubular body can expand it.
Inventors
- 👤 Emile Mallet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:54
CPC Classifications
F; F16; F16B; F16B19/00; F16B19/04; F16B19/08; F16B19/10; F16B19/1027; F16B19/1036; F16B19/1081
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
168 words
A fastener assembly receivable in a bore and comprising: an elongated continuous tubular body of closed uniform polygonal cross-section having at least three sides and composed of an elastically expandible material; a head at one end of said body and formed unitarily therewith; at least three axially extending ribs projecting laterally from the corners of said body and engageable with the wall of said bore; at least three angularly-spaced generally J-shaped deformable arms each having a short leg attached to the other end of said body between said ribs and a long leg of lesser length than said body formed with an enlarged head and lying along a respective one of said sides, each rib extending outwardly between and laterally beyond a pair of said arms when said arms are pressed against said body portions of each of said arms being laterally outwardly deformed upon driving said body into said bore; and a screw received in said body at said head for expanding said body against said wall.
Claim 2
Dependent Claim
168 words
A fastener assembly receivable in a bore and comprising: an elongated continuous tubular body of closed uniform polygonal cross-section having at least three sides and composed of an elastically expandible material; a head at one end of said body and formed unitarily therewith; at least three axially extending ribs projecting laterally from the corners of said body and engageable with the wall of said bore; at least three angularly-spaced generally J-shaped deformable arms each having a short leg attached to the other end of said body between said ribs and a long leg of lesser length than said body formed with an enlarged head and lying along a respective one of said sides, each rib extending outwardly between and laterally beyond a pair of said arms when said arms are pressed against said body portions of each of said arms being laterally outwardly deformed upon driving said body into said bore; and a screw received in said body at said head for expanding said body against said wall.
Claim 3
Dependent Claim
16 words
A fastener assembly defined in claim 1 wherein said legs are all parallel to said body.
Claim 4
Dependent Claim
13 words
The fastener assembly defined in claim 2 wherein said ribs are longitudinally ridged.
Claim 5
Dependent Claim
14 words
The fastener assembly defined in claim 3 wherein said body is triangular in cross-section.
Claim 6
Dependent Claim
15 words
The fastener assembly defined in claim 4 wherein said body is made of synthetic resin.
Claim 7
Dependent Claim
22 words
The fastener assembly defined in claim 5 wherein said long legs lie within a cylinder tangent to the periphery of said ribs.
Claim 8
Dependent Claim
116 words
A one-piece fastener receivable in a hole in a wall, comprises a tubular expandable polyhedral body of synthetic resin having at least three angularly-spaced longitudinally-extending surfaces, respective deformable arms unitary with said body and continuing each of said surfaces while being turned back parallel thereto, said arms being of lesser length than said body, respective ribs extending longitudinally along said body and projecting laterally beyond said arms when the latter are pressed against said body, and respective enlarged formations on the free end of said arms engageable with said wall for retaining said free ends upon driving of sAid body into said hole, portions of each of said arms being laterally outwardly deformed upon said driving.
Claim 9
Dependent Claim
116 words
A one-piece fastener receivable in a hole in a wall, comprises a tubular expandable polyhedral body of synthetic resin having at least three angularly-spaced longitudinally-extending surfaces, respective deformable arms unitary with said body and continuing each of said surfaces while being turned back parallel thereto, said arms being of lesser length than said body, respective ribs extending longitudinally along said body and projecting laterally beyond said arms when the latter are pressed against said body, and respective enlarged formations on the free end of said arms engageable with said wall for retaining said free ends upon driving of sAid body into said hole, portions of each of said arms being laterally outwardly deformed upon said driving.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |