Non-removable structural threaded fastener with threads of lesser outer diameter than the shank and method of forming same

• US 6,290,445 B1
• Filed: 04/18/2000
• Issued: 09/18/2001
• Est. Priority Date: 04/18/2000
• Status: Expired due to Fees

• Current Assignee: Avibank Manufacturing Incorporated (Berkshire Hathaway Incorporated)
• Original Assignee: Avibank Manufacturing Incorporated (Berkshire Hathaway Incorporated)
• Inventors: Avetisian, Edward, Diamond, Todd, Duran, John A.
• Primary Examiner(s): Saether, Flemming
• Application Number:
  US09/552,474
• Time in Patent Office: 518 Days
• Field of Search: 411/423, 411/411, 411/395, 411/399, 411/366.1, 411/283
• US Class Current: 411/423
• CPC Class Codes: F16B 39/30 Locking exclusively by special shape of the screw-thread
• CPC Class Codes: F16B 5/0208 using panel fasteners, i.e. permanent attachments allowing for quick assembly

Abstract

Apparatus and method for forming a pin and nut fastener assembly for temporarily or permanently securing two panels having conventional drilled generally aligned holes into which the assembly is inserted. Weight of the pin and nut is reduced while retaining predetermined industry established strength requirements. The thread section of the pin is reduced along with the mating thread of the nut. The pin may be cold-worked in critical areas.

Claims

1. In a fastener assembly including a pin having a head at one end, a cylindrical shank integral with the head, a threaded shaft and a transition section interconnecting the threaded shaft and said shank, said threaded shaft comprises:

spaced threaded portions, each of which having a pair of flanks at an approximate angle of 60°

each;

said pair of flank being truncated and defining an outer major diameter D₁, the imaginary point where said flanks would meet when extended to an apex being defined at a point D;

opposing flank of adjacent spaced threaded portions further defining a root diameter d₁, the imaginary point where said opposing flanks of adjacent spaced threaded portions would meet being defined at a point d;

the distance between D and d being defined by H and the distance between D₁ and d₁ being defined by h;

said distance h being about 55% to 65% of the distance H; and

said root diameter being continuous.

2. In a fastener assembly including a pin having a head at one end, a cylindrical shank integral with the head, a threaded shaft and a transition section interconnecting the threaded shaft and said shank, said threaded shaft comprises:

spaced threaded portions, each of which having a pair of flanks at an approximate angle of 60°

each;

said pair of flank being truncated and defining an outer major diameter D₁, the imaginary point where said flanks would meet when extended to an apex being defined at a point D;

opposing flank of adjacent spaced threaded portions further defining a root diameter d₁, the imaginary point where said opposing flanks of adjacent spaced threaded portions would meet being defined at a point d;

the distance between D and d being defined by H and the distance between D₁ and d₁ being defined by h;

said distance h being about 55% to 65% of the distance H; and

said root diameter being continuous;

a nut having a main body portion with a threaded throughbore threadably mounted on said threaded shaft of said pin, the thread of said nut formed to mate with the thread of said pin.

3. A fastener assembly including a pin having a head at one end, a threaded shaft at the other end, and an integral main body portion interconnecting the head and the shaft, said threaded shaft comprising:

spaced threaded portions, each of which having a pair of flanks at an approximate angle of 60°

each;

said pair of flank being truncated and defining an outer major diameter D₁, the imaginary point where said flanks would meet when extended to an apex being defined at a point D;

opposing flank of adjacent spaced threaded portions further defining a root diameter d₁, the imaginary point where said opposing flanks of adjacent spaced threaded portions would meet being defined at a point d;

the distance between D and d being defined by H and the distance between D₁ and d₁ being defined by h;

said distance h being about 55% to 65% of the distance H;

said root diameter being continuous; and

a nut having a main body portion with a threaded throughbore threadably mounted on said threaded shaft of said pin, the thread of said nut formed to mate with the thread of said pin.

4. A pin comprising:

a head section;

a cylindrical shank portion integral with the head section;

a transition section integral with the cylindrical shank portion;

attachment means integral with the transition section adapted to secure the pin to a mating drive nut;

a drive socket formed internally in the attachment means of the pin, said socket being axially aligned with said shank portion and said transition section; and

said attachment means including;

spaced threaded portions, each of which having a pair of flanks at an approximate angle of 60°

each;

said pair of flank being truncated and defining an outer major diameter D₁, the imaginary point where said flanks would meet when extended to an apex being defined at a point D;

opposing flank of adjacent spaced threaded portions further defining a root diameter d₁, the imaginary point where said opposing flanks of adjacent spaced threaded portions would meet being defined at a point d;

the distance between D and d being defined by H and the distance between D₁ and d₁ being defined by h;

said distance h being about 55% to 65% of the distance H; and

said root diameter being continuous.