초록 ▼

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

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.

대표청구항 ▼

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

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; andc) 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.