US3883915A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a nut
Assignee: Multifastener Corp
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Filing: 1974-10-21
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Granted: 1975-05-20
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Expires: 1994-10-21
Abstract
Abstract A nut having a threaded bore including a cylindrical threaded portion through one end of the nut and a conical threaded portion opening through the opposed end of the nut for receiving the unthreaded portion of a bolt shank, without binding. The nut bore is formed by impacting one end of the nut blank with a cylindrical punch while the nut is supported on a die having an enlarged opening, breaking a cylindrical opening through the opposed end of the nut blank. The disclosed nut is a pierce nut and the conical bore portion opens through the pilot portion, eliminating the requirement for a countersink or counter-bore.
Inventors
- 👤 Joseph H Steward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:41
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/24; F; F16; F16B; F16B37/00; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/965; Y10S411/968
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
162 words
A method of forming a nut having a threaded bore, comprising the steps of: a. supporting the nut blank on a die having a circular opening, b. forming in said blank a bore comprising a cylindrical portion opening at one face of said blank at one end thereof, which cylindrical portion smoothly blends into a coaxially aligned conical portion which opens through said blank at another face of said blank at an end opposed to said one end, said conical portion having a major diameter generally equal to said die opening, by impacting the nut with a high-speed cylindrical punch coaxially aligned with said die opening, said die opening having a diameter approximately 13 to 18% greater than the diameter of said punch, and c. tapping the internal surface of said cylindrical and conical openings, forming a continuous female thread in the nut bore defined by said openings with partially formed, truncated threads in said conical portion adjacent said opposed nut end.
Claim 2
Independent Claim
162 words
A method of forming a nut having a threaded bore, comprising the steps of: a. supporting the nut blank on a die having a circular opening, b. forming in said blank a bore comprising a cylindrical portion opening at one face of said blank at one end thereof, which cylindrical portion smoothly blends into a coaxially aligned conical portion which opens through said blank at another face of said blank at an end opposed to said one end, said conical portion having a major diameter generally equal to said die opening, by impacting the nut with a high-speed cylindrical punch coaxially aligned with said die opening, said die opening having a diameter approximately 13 to 18% greater than the diameter of said punch, and c. tapping the internal surface of said cylindrical and conical openings, forming a continuous female thread in the nut bore defined by said openings with partially formed, truncated threads in said conical portion adjacent said opposed nut end.
Claim 3
Dependent Claim
91 words
The method of forming a nut as defined in claim 1, wherein the enlarged conical opening is formed with a diameter of sufficient dimension to receive a threaded bolt having a head, a threaded shank portion and an unthreaded shank portion adjacent said head, said bolt unthreaded shank portion having a diameter greater than the minor internal crest diameter of said threaded cylindrical portion, but smaller than the major diameter of said conical portion adjacent said opposed nut end, permitting the bolt to be threadably received within said nut without interference.
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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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |