Anchoring screw with double heads and triple threads of different depths of thread

• US 6,918,727 B2
• Filed: 01/14/2004
• Issued: 07/19/2005
• Est. Priority Date: 05/01/2002
• Status: Active Grant

• Current Assignee: Joker Industrial Company Limited
• Original Assignee: Joker Industrial Company Limited
• Inventors: Huang, Pan-Ching
• Primary Examiner(s): Miller, William L.
• Application Number:
  US10/756,270
• Publication Number:
  US 20050129484A1
• Time in Patent Office: 552 Days
• Field of Search: 411411-413, 411/416, 411/423, 411/389, 411308-312, 411/82, 411/403, 411/107
• US Class Current: 411/389
• CPC Class Codes: F16B 25/00 Screws that cut thread in the body into which they are screwed, e.g. wood screws F16B35/065 takes precedence; joining sheets or plates using screws with two separate threads F16B5/0275, using screws with adjustment sleeves F16B5/0283
• CPC Class Codes: F16B 25/0026 the material being a hard non-organic material, e.g. stone, concrete or drywall F16B25/0031 takes precedence
• CPC Class Codes: F16B 25/0047 the ridge being characterised by its cross-section in the plane of the shaft axis
• CPC Class Codes: F16B 25/0068 with multiple-threads, e.g. a double thread screws
• CPC Class Codes: F16B 35/042 for retention or rotation by a tool, e.g. of polygonal cross-section
• CPC Class Codes: F16B 5/0275 the screw-threaded element having at least two axially separated threaded portions F16B5/0283 takes precedence

Abstract

An anchoring screw with triple threads of different depths of thread especially useful for coupling with a construction hole on a cement wall (or other construction boards and panels) includes a first bolt section, a tool driven section and a second bolt section. The second bolt section has a first screw thread, a second screw thread and a third screw thread of different depths of thread formed on the outer surface that are spaced from one another at 120 degrees. Thus, the screw threads can gather extruded cement debris when the screw is fastened into the construction hole to produce a stronger fastening effect. As there is no expansion incurred, the wall or board does not crack. Therefore, the interval between the construction holes may be shortened, and the number of construction holes may be increased in a given unit area. The anchoring screw of the invention also may be removed easily and conveniently to facilitate construction.

Claims

1. An anchoring screw comprising:

a) a first bolt section having an external thread formed on an exterior thereof;

b) a second bolt section having first, second, and third screw threads equally spaced on an exterior periphery thereof, each of the screw threads having a different thread height, wherein the height of the first screw thread is greater than the height of the second screw thread, and the height of the second threw thread is greater than the height of the third screw thread, the third screw thread being located adjacent the free end of the second bolt section; and

c) a tool driven section located between the first bolt section and the second bolt section, wherein the tool driven section is a polygonal flange located adjacent to an end of the first, the second and the third screw threads on a first tool driven section end and located adjacent to an end of the external thread of the first bolt section on a second tool driven section end.

2. The anchoring screw according to claim 1, wherein a first screw edge of the first screw thread, a second screw edge of the second screw thread and a third screw edge of the third screw thread maintain a three-point balanced condition on a force receiving cross section.