Patent US3899893A successfully refreshed from Google Patents.
US3899893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anchoring pin and method for structures such as mine and tunnel roofs and side walls
Assignee: Lee Norse Co
•
Filing: 1974-01-03
•
Granted: 1975-08-19
•
Expires: 1994-01-03
Abstract
Abstract An anchoring pin comprising an enlarged leading portion having a leading face for enlarging a smaller pre-drilled hole during longitudinal insertion of the pin therein, the pin body having a longitudinal bore which opens through its leading end for discharge of material broken-up and displaced by said leading portion during such enlargement of the hole. Also, an anchoring method comprising the steps of forming a hole in the structure to be anchored, providing a said anchoring pin having a leading portion of greater peripheral dimension than the formed hole, and inserting the pin into the hole to cause the pin leading portion to enlarge the hole while material displaced by such enlargement is discharged through the pin contained bore.
Inventors
- 👤 Bani R Banerjee
- 👤 Mukund D Gangal
- 👤 Sigmund Black
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:30
CPC Classifications
E; E21; E21D; E21D21/00; E21D21/0026
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
144 words
An anchoring pin for anchoring structures such as mine and tunnel roofs and side walls, comprising an elongated body having a leading end and a trailing end, said body adjacent its said leading end including a leading portion of peripheral dimension greater than that of a thereafter following portion of said body, said leading portion being of outer diameter larger than the outer diameter of said following portion of said body, said leading portion having an annular leading face extending transversely of the axis of said body capable of breaking-up and displacing material to cause lateral enlargement of a smaller diameter hole during driven insertion of the pin, leading end first, therein, and said body having an axial bore which opens through its said leading and trailing ends for discharge of material broken-up and displaced by said leading face during such pin driven insertion.
Claim 2
Dependent Claim
144 words
An anchoring pin for anchoring structures such as mine and tunnel roofs and side walls, comprising an elongated body having a leading end and a trailing end, said body adjacent its said leading end including a leading portion of peripheral dimension greater than that of a thereafter following portion of said body, said leading portion being of outer diameter larger than the outer diameter of said following portion of said body, said leading portion having an annular leading face extending transversely of the axis of said body capable of breaking-up and displacing material to cause lateral enlargement of a smaller diameter hole during driven insertion of the pin, leading end first, therein, and said body having an axial bore which opens through its said leading and trailing ends for discharge of material broken-up and displaced by said leading face during such pin driven insertion.
Claim 3
Dependent Claim
83 words
An anchoring pin according to claim 1, wherein said leading portion is of outer diameter at least one-eighth of an inch larger than the outer diameter of saiD thereafter following portion of said body, said body is a complete annulus, said leading portion is, longitudinally of said body, only a minor portion of the length of said body, said leading face extends normal to the axis of said body, and further comprising supporting plate means slidably carried by said body intermediate its ends.
Claim 4
Independent Claim
169 words
A method for anchoring structures such as mine and tunnel roofs and side wall, comprising the steps of forming a hole in the structure to be anchored, providing an elongated annular anchoring pin including a transversely enlarged leading portion adjacent its leading end of outer diameter substantially greater than the diameter of said formed hole and having a transversely extending annular leading face capable of breaking-up and displacing material to laterally enlarge a smaller diameter hole, longitudinally driving said anchoring pin, leading end first, into said formed hole to cause said leading face of said leading portion to break-up and displace material adjacent the edges of said formed hole and thereby laterally enlarge said formed hole while said pin is so driven therein, during such driving of said pin discharging said broken-up and displaced material from the hole through an axial bore formed longitudinally through said anchoring pin, and employing the elastic force of the thus installed pin against the wall of the enlarged bore for anchoring the structure.
Claim 5
Independent Claim
169 words
A method for anchoring structures such as mine and tunnel roofs and side wall, comprising the steps of forming a hole in the structure to be anchored, providing an elongated annular anchoring pin including a transversely enlarged leading portion adjacent its leading end of outer diameter substantially greater than the diameter of said formed hole and having a transversely extending annular leading face capable of breaking-up and displacing material to laterally enlarge a smaller diameter hole, longitudinally driving said anchoring pin, leading end first, into said formed hole to cause said leading face of said leading portion to break-up and displace material adjacent the edges of said formed hole and thereby laterally enlarge said formed hole while said pin is so driven therein, during such driving of said pin discharging said broken-up and displaced material from the hole through an axial bore formed longitudinally through said anchoring pin, and employing the elastic force of the thus installed pin against the wall of the enlarged bore for anchoring the structure.
Claim 6
Dependent Claim
32 words
An anchoring method according to claim 3, wherein the provided pin includes a leading portion of outer diameter at least one-quarter of an inch greater than the diameter of the formed hole.
Claim 7
Dependent Claim
47 words
An anchoring method according to claim 3, further comprising the steps of, during said driving of said pin, causing a supporting plate to slide rearwardly on said anchoring pin, and employing said supporting plate, after the installation of said pin, for providing suspension support of the structure.
References Cited (Backward Citations)
US1963301A
Cited
US2963935A
Cited
US3377807A
Cited
US3643542A
Cited
US3653217A
Cited
US3832930A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |