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US 2021/0079945 A1Published application
Reinforced Cap Head Screws
AssigneeClarcorp Industrial Sales, Inc.
InventorsHsin-Te Tsai, Ya-Lun Tsai
Life of this patent
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Abstract
A self-tapping screw for use in securing at least two materials together. The self-tapping screw may include a screw cap that receives a screw body to reinforce the strength of the screw head. The screw cap is composed of a zinc-aluminum alloy that may be die casted and provides additional strength and hardness to the attached screw body. The screw cap has a rolled flange that helps to securely retain the flat rim of the attached screw body.
Claims20
A screw comprising:
- a screw body having an elongate shaft extending along a central linear axis and supporting threads extending about the linear axis in a helical path and, at a lower end, providing a screw tip and, at an upper end, providing an outwardly extending rim extending substantially perpendicular to the linear axis;
- a screw cap having an inner bore receiving the outwardly extending rim therein and supporting a rolled flange extending inwardly from an inner surface of the screw cap and having an innermost end that is angled upwardly from horizontal to retain the outwardly extending rim.
A self tapping screw comprising:
- a screw body wherein the screw body comprises
- an elongate shaft extending along a central linear axis and supporting threads extending about the linear axis in a helical path and, at a lower end, providing a pointed tip;
- a non-circular head supported at an upper end of the elongate shaft;
- an outwardly extending rim supported below the screw head and extending perpendicular to the linear axis;
- and
- a screw cap having an exterior surface providing a hex head and a non-circular inner bore receiving the non-circular head and outwardly extending rim therein and supporting an upwardly rolled flange extending inwardly from an inner surface of the screw cap and having a distal end that is angled upwardly to retain the outwardly extending rim.
3 more elements
A method of manufacturing a screw wherein the screw comprises:
- a screw body having an elongate shaft extending along a central linear axis and supporting threads extending about the axis in a helical path and, at a lower end, providing a screw tip and, at a upper end, providing an outwardly extending rim extending perpendicular to the linear axis;
- and
- a screw cap having an inner bore receiving the outwardly extending rim therein and supporting a rolled flange extending inwardly from an inner surface of the screw cap and having an innermost end that is angled upwardly from horizontal to retain the outwardly extending rim;
- the method comprising the steps of:
- attaching the screw cap to the elongate shaft to retain the outwardly extending rim within the rolled flange of the screw cap.
2 more elements
Dependencies are inferred from the claim text.