Screw with two cut removing curved grooves

• US 6,106,208 A
• Filed: 09/23/1998
• Issued: 08/22/2000
• Est. Priority Date: 12/31/1997
• Status: Expired due to Term

• Current Assignee: Jack Lin
• Original Assignee: Jack Lin
• Inventors: Lin, Jack
• Primary Examiner(s): WILSON, NEILL R
• Application Number:
  US09/159,396
• Time in Patent Office: 699 Days
• Field of Search: 411/386, 411/387, 411/418, 411/420, 411/421, 411/387.2
• US Class Current: 411/418
• CPC Class Codes: F16B 25/0015 the material being a soft organic material, e.g. wood or plastic F16B25/0031 takes precedence
• CPC Class Codes: F16B 25/0078 with a shaft of non-circular cross-section or other special geometric features of the shaft
• CPC Class Codes: F16B 25/103 by means of a drilling screw-point, i.e. with a cutting and material removing action

Abstract

A screw with two cut removing curved grooves has a head and a shank with a helical threads. The shank has two lengthwise grooves partially overlapping with each other, when viewed projectively from the horizontal surface or from the vertical surface of the center line or axis of the screw.

Claims

1. A screw with two cut removing curved grooves comprising ahead and a shank substantially provided with helical threads, said shank having a pointed end, and characterized in that said shank has a first lengthwise groove and a second lengthwise groove partially overlapping with each other, said first and second grooves respectively having a curvature so that the -depth of said grooves is larger than 0 but smaller than the outer diameter of said threads, and the length of said grooves is larger than 0 but smaller than the whole length of said shank;

said first lengthwise groove extends upward from the pointed end; and

said second lengthwise groove extends upward from the level about on upper end of the first lengthwise groove.