Coiled spring lock washer for socket bolts

• US 4,064,921 A
• Filed: 09/05/1974
• Issued: 12/27/1977
• Est. Priority Date: 09/08/1973
• Status: Expired due to Term

• Current Assignee: Shigeru Kose
• Original Assignee: Shigeru Kose
• Inventors: Kose, Shigeru
• Primary Examiner(s): Britts, Ramon S.
• Application Number:
  US05/503,520
• Time in Patent Office: 1,209 Days
• Field of Search: 151/38, 151/36, 151/37
• US Class Current: 411/148
• CPC Class Codes: F16B 39/24 by means of washers, spring washers, or resilient plates that lock against the object locking to the screw-thread F16B39/14 , F16B39/34, F16B39/36

Abstract

A coiled spring lock washer characterized in that it is made by winding elastic wire rod spirally into two rings at the most, an upper ring of which having the outside diameter slightly larger than the inside diameter of a lower ring so that the upper ring may be forced into the lower ring to some extent when fastening a bolt, thereby preventing the bolt from loosening perfectly.

Claims

1. A coiled spring lock washer for a socket bolt having a head portion and fitted into a member having a socket for receiving said bolt, said lock washer comprised of an elastic wire rod positioned beneath the head of the bolt in said socket and wound conically into a coil having more than one ring and less than two rings, said coil having a lower ring portion and an upper ring portion conically above the lower ring portion beneath the head of the socket bolt, the upper ring portion having an outside diameter slightly larger than the inside diameter of the lower ring portion, and the lower ring portion having an outside diameter slightly smaller than the inside diameter of the socket in which it is positioned, whereby tightening the bolt causes the upper ring portion of the rod above the lower ring portion contacting the underneath side of the head of the bolt to move downward against the inside diameter of the lower ring portion, forcing the lower ring portion to move downward into the socket and to expand the wedge against the side wall of the bottom of the socket, thus forcing the upper ring portion of the rod to wind around the bolt shaft as it is tightened, hereby locking the bolt into position in the socket.