Screw with anti-loosening features

Patent metadata

Field	Value
Publication number	US-2019242425-A1
Application number	US-201815887726-A
Country	US
Kind code	A1
Filing date	Feb 2, 2018
Priority date	Feb 2, 2018
Publication date	Aug 8, 2019
Grant date	—

Abstract

A screw may include a head, a threaded cylindrical shaft mechanically coupled to the head such that an axis of the threaded cylindrical shaft extends from the head, and a plurality of substantially spaced serration features formed proximate to where the head is mechanically coupled to the threaded cylindrical shaft, each of the plurality of substantially spaced serration features mechanically coupled to the head and threaded cylindrical shaft. Each serration feature may include a displacer mechanically coupled to the head and the threaded cylindrical shaft and configured to, when the screw is driven into a receptacle for receiving the screw via a countersink, displace material of the countersink and an undercut mechanically coupled to the head and the threaded cylindrical shaft and configured to engage with the countersink in order to prevent the screw from disengaging from the countersink and the receptacle due to a mechanical force upon the screw.

First claim

What is claimed is:

1 . A screw comprising:
a head; a threaded cylindrical shaft mechanically coupled to the head such that an axis of the threaded cylindrical shaft extends from the head; and a plurality of substantially spaced serration features formed proximate to where the head is mechanically coupled to the threaded cylindrical shaft, each of the plurality of substantially spaced serration features mechanically coupled to the head and the threaded cylindrical shaft and comprising:
a displacer mechanically coupled to the head and the threaded cylindrical shaft and configured to, when the screw is driven into a receptacle for receiving the screw via a countersink, displace material of the countersink; and
an undercut mechanically coupled to the head and the threaded cylindrical shaft and configured to engage with the countersink in order to prevent the screw from disengaging from the countersink and the receptacle due to a mechanical force upon the screw.

2 . The screw of claim 1 , wherein the mechanical force comprises a vibrational force.

3 . The screw of claim 1 , wherein the displacer comprises an approximately planar surface with convexity, wherein such surface is generally triangular in shape.

4 . The screw of claim 3 , wherein:
a first edge of the triangular shape of the displacer is coupled directly to a bottom of the head; a second edge of the triangular shape of the displacer is coupled directly to the cylindrical shaft; and a third edge of the triangular shape of the displacer extends from the bottom of the head to the cylindrical shaft.

5 . The screw of claim 4 , wherein:
a first edge of the triangular shape of the undercut is coupled directly to a bottom of the head; a second edge of the triangular shape of the undercut is coupled directly to the cylindrical shaft; and the undercut shares a third edge of the triangular shape of the undercut with the third edge of the triangular shape of the displacer.

6 . An information handling system comprising:
a chassis; an information handling resource; a carrier mechanically coupled to the chassis and configured for receiving the information handling resource; and a screw for mechanically coupling the information handling resource to the carrier, the screw comprising:
a head;
a threaded cylindrical shaft mechanically coupled to the head such that an axis of the threaded cylindrical shaft extends from the head; and
a plurality of substantially spaced serration features formed proximate to where the head is mechanically coupled to the threaded cylindrical shaft, each of the plurality of substantially spaced serration features mechanically coupled to the head and the threaded cylindrical shaft and comprising:
a displacer mechanically coupled to the head and the threaded cylindrical shaft and configured to, when the screw is driven into a receptacle of the information handling resource for receiving the screw via a countersink of the carrier, displace material of the countersink; and
an undercut mechanically coupled to the head and the threaded cylindrical shaft and configured to engage with the countersink in order to prevent the screw from disengaging from the countersink and the receptacle due to a mechanical force upon the screw.

7 . The information handling system of claim 6 , wherein the mechanical force comprises a vibrational force.

8 . The information handling system of claim 6 , wherein the displacer comprises an approximately planar surface with convexity, wherein such surface is generally triangular in shape.

9 . The information handling system of claim 8 , wherein:
a first edge of the triangular shape of the displacer is coupled directly to a bottom of the head; a second edge of the triangular shape of the displacer is coupled directly to the cylindrical shaft; and a third edge of the triangular shape of the displacer extends from the bottom of the head to the cylindrical shaft.

10 . The information handling system of claim 9 , wherein:
a first edge of the triangular shape of the undercut is coupled directly to a bottom of the head; a second edge of the triangular shape of the undercut is coupled directly to the cylindrical shaft; and the undercut shares a third edge of the triangular shape of the undercut with the third edge of the triangular shape of the displacer.

11 . A method comprising:
mechanically coupling a head of a screw to a threaded cylindrical shaft of the screw such that an axis of the threaded cylindrical shaft extends from the head; and mechanically coupling a plurality of substantially spaced serration features proximate to where the head is mechanically coupled to the threaded cylindrical shaft, each of the plurality of substantially spaced serration features mechanically coupled to the head and the threaded cylindrical shaft and comprising:
a displacer mechanically coupled to the head and the threaded cylindrical shaft and configured to, when the screw is driven into a receptacle for receiving the screw via a countersink, displace material of the countersink; and
an undercut mechanically coupled to the head and the threaded cylindrical shaft and configured to engage with the countersink in order to prevent the screw from disengaging from the countersink and the receptacle due to a mechanical force upon the screw.

12 . The method of claim 11 , wherein the mechanical force comprises a vibrational force.

13 . The method of claim 11 , wherein the displacer comprises an approximately planar surface with convexity, wherein such surface is generally triangular in shape.

14 . The method of claim 13 , wherein:
a first edge of the triangular shape of the displacer is coupled directly to a bottom of the head; a second edge of the triangular shape of the displacer is coupled directly to the cylindrical shaft; and a third edge of the triangular shape of the displacer extends from the bottom of the head to the cylindrical shaft.

15 . The method of claim 14 , wherein:
a first edge of the triangular shape of the undercut is coupled directly to a bottom of the head; a second edge of the triangular shape of the undercut is coupled directly to the cylindrical shaft; and the undercut shares a third edge of the triangular shape of the undercut with the third edge of the triangular shape of the displacer.

Assignees

• Dell Products Lp

Inventors

• Chen Yu-Lin
• Lo Michael

Classifications

• H05K7/1489

  characterized by the mounting of blades therein, e.g. brackets, rails, trays (H05K7/1491 takes precedence) · CPC title

• F16B39/282 Primary

  Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts · CPC title

• F16B35/065

  with self-countersink-cutting means · CPC title