Patent US3871264A successfully refreshed from Google Patents.
US3871264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Driven fastener for limited penetration of metal
Assignee: Individual
•
Filing: 1972-11-27
•
Granted: 1975-03-18
•
Expires: 1992-11-27
Abstract
Abstract A fastener having a shank with a head at one end and a hardened penetrating portion at the opposite end with a frustoconical exterior wall terminating in a penetrating end. The penetrating portion includes a recess having a transverse wall axially spaced from the penetrating end and at least a portion of the transverse wall extends laterally outwardly of the penetrating end to provide an undercut portion. The fastener is adapted to be driven into a hard material so that the hard material flows into the undercut portions of the fastener without deforming the penetrating portion of the fastener.
Inventors
- 👤 Robert L Hallock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:56
CPC Classifications
F; F16; F16B; F16B19/00; F16B15/00; F16B17/00; F16B17/006; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/965; Y10S411/968; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833; Y10T29/49908; Y10T29/49915; Y10T29/4992; Y10T29/49936; Y10T29/49938
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
228 words
A fastener for limited penetration into metal comprising a smooth generally cylindrical shank with an enlarged head at one end and a rigid substantially non-deformable penetrating portion at the other end, said head being engageable by an impact force which is applied generally axially of said shank, said penetrating portion having a generally circumferentially continuous frusto-conical exterior wall tapering inwardly towards the axis of said shank in a direction away from the head and terminating in a penetrating end, said penetrating portion having a recess defined by an inner wall extending from said penetrating end to an abutment wall spaced axially inwardly therefrom, at least portions of said abutment wall extending laterally outwardly of the iinner periphery of said penetrating end, at least portions of said inner wall being inclined outwardly at an angle of substantially 10* from said penetrating end to said portions of said abutment wall to provide significant undercut portions, and said penetrating portion being hardened so that it is harder than the metal into which it is to be driven, whereby when said fastener is driven substantially axially into metal by impact, the driving force causes said penetrating portion to penetrate the metal until the metal engages said abutment wall and is diverted outwardly into said undercut portions to secure the fastener to the metal and resist withdrawal of the fastener from the metal.
Claim 2
Dependent Claim
228 words
A fastener for limited penetration into metal comprising a smooth generally cylindrical shank with an enlarged head at one end and a rigid substantially non-deformable penetrating portion at the other end, said head being engageable by an impact force which is applied generally axially of said shank, said penetrating portion having a generally circumferentially continuous frusto-conical exterior wall tapering inwardly towards the axis of said shank in a direction away from the head and terminating in a penetrating end, said penetrating portion having a recess defined by an inner wall extending from said penetrating end to an abutment wall spaced axially inwardly therefrom, at least portions of said abutment wall extending laterally outwardly of the iinner periphery of said penetrating end, at least portions of said inner wall being inclined outwardly at an angle of substantially 10* from said penetrating end to said portions of said abutment wall to provide significant undercut portions, and said penetrating portion being hardened so that it is harder than the metal into which it is to be driven, whereby when said fastener is driven substantially axially into metal by impact, the driving force causes said penetrating portion to penetrate the metal until the metal engages said abutment wall and is diverted outwardly into said undercut portions to secure the fastener to the metal and resist withdrawal of the fastener from the metal.
Claim 3
Dependent Claim
29 words
The structure of claim 1 including a central portion within said recess, said central portion extending from said abutment wall to a position substantially coextensive with said penetrating end.
Claim 4
Dependent Claim
15 words
The structure of claim 2 in which said central portion is substantially conical in cross-section.
Claim 5
Dependent Claim
13 words
The structure of claim 2 in which said central portion is substantially cylindrical.
Claim 6
Dependent Claim
40 words
The structure of claim 1 in which other portions of said inner wall are inclined inwardly from said penetrating end to other portions of said abutment wall to provide segments with said exterior wall which are generally conical in cross-section.
Claim 7
Dependent Claim
243 words
A fastener for limited penetration into metal comprising a generally cylindrical shank having an enlarged head at one end and a substantially non-deformable penetrating portion at the other end, said head being engageable by an impact force generally axially of said shank, said penetrating portion including a circumferentially continuous exterior wall tapering inwardly towards the axis of said shank in a direction away from said head and terminating in a flattened penetrating end having inner and outer peripheries, said penetrating portion having a recess defined by an inner wall extending upwardly from the inner periphery of said penetrating end to a substantially transverse wall spaced axially therefrom, at least portions of said transverse wall extending laterally outwardly of the inner periphery of said penetrating end, at least portions of said inner wall being inclined outwardly at an angle of substantially 10* from said penetrating end and connected to said portions of said transverse wall to provide significant undercut portions, a substantially conical central portion extending downwardly from said transverse wall to a position substantially co-extensive with said penetrating end, and said penetrating portion being hardened to retain the shape thereof when driven, whereby when said fastener is driven substantially axially into metal by impact, the driving force causes said penetrating portion to penetrate the metal so that the metal engages said central portion and is diverted outwardly to said transverse wall and into said undercut portions to secure the fastener to the metal.
Claim 8
Dependent Claim
243 words
A fastener for limited penetration into metal comprising a generally cylindrical shank having an enlarged head at one end and a substantially non-deformable penetrating portion at the other end, said head being engageable by an impact force generally axially of said shank, said penetrating portion including a circumferentially continuous exterior wall tapering inwardly towards the axis of said shank in a direction away from said head and terminating in a flattened penetrating end having inner and outer peripheries, said penetrating portion having a recess defined by an inner wall extending upwardly from the inner periphery of said penetrating end to a substantially transverse wall spaced axially therefrom, at least portions of said transverse wall extending laterally outwardly of the inner periphery of said penetrating end, at least portions of said inner wall being inclined outwardly at an angle of substantially 10* from said penetrating end and connected to said portions of said transverse wall to provide significant undercut portions, a substantially conical central portion extending downwardly from said transverse wall to a position substantially co-extensive with said penetrating end, and said penetrating portion being hardened to retain the shape thereof when driven, whereby when said fastener is driven substantially axially into metal by impact, the driving force causes said penetrating portion to penetrate the metal so that the metal engages said central portion and is diverted outwardly to said transverse wall and into said undercut portions to secure the fastener to the metal.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |