Low-wear screw structure
AssigneeBi-Mirth Corp.
InventorYi-Chieh Shih
Life of this patent
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Abstract
The invention provides a low-wear screw structure which comprises a screw head, a rod body, a first thread and at least a crushing rib, wherein the rod body extending out from the screw head and being successively formed with a rod extension part, a reaming part and a taper part, the first thread being annularly arranged on an outer peripheral surface of the rod body at a distance from the taper part to the rod extension part through the reaming part, the crushing ribs being arranged on the rod body at the reaming part, wherein a first included angle is formed between the first side surface and the outer peripheral surface of the rod body, a second included angle is formed between the second side surface and the outer peripheral surface of the rod body, and the first included angle is different from the second included angle.
Claims10
A low-wear screw structure including:
- a screw head comprising a top and a neck extending from the top and tapering away from the top;
- a rod body extending from the neck of the screw head, wherein the rod body comprises a rod extension part connected to the neck, a reaming part connected to the rod extension part and a taper part connected to an other side of the reaming part, wherein the rod extension part is provided with a first bottom diameter, and the reaming part is provided with a second bottom diameter;
- a first thread annularly arranged on an outer peripheral surface of the rod body at a distance from the taper part to the rod extension part through the reaming part;
- and
- at least a crushing rib, the crushing rib being arranged on the outer peripheral surface of the rod body at the reaming part, each crushing rib being provided with a first side surface and a second side surface;
- wherein the first thread at the reaming part being provided with a plurality of sawtooth cutting edges at an outer periphery;
- wherein a first included angle being formed between the first side surface of each crushing rib and the outer peripheral surface of the rod body at a cross section of the crushing rib and the rod body, a second included angle being formed between the second side surface of each crushing rib and the outer peripheral surface of the rod body at a cross section of the crushing rib and the rod body, and the first included angle being different from the second included angle.
Dependencies are inferred from the claim text.