Easily removeable push-on spring nut

Patent metadata

Field	Value
Publication number	US-2019219087-A1
Application number	US-201816186787-A
Country	US
Kind code	A1
Filing date	Nov 12, 2018
Priority date	Nov 22, 2017
Publication date	Jul 18, 2019
Grant date	—

Abstract

A fastener is installed by applying an axial pressing force onto a mating component such as a round pin or a square tab. The fastener includes spring arms formed by bent tabs which deflect when pressed onto and grip the pin or other mating component between jaws of the arms making the fastener resistant to being pulled off. Downward facing fingers located around the periphery of the fastener flex when they come into contact with another portion of the mating component. This creates a residual clamp load between the fastener and the component. The fastener can easily be removed using a tool similar to snap ring pliers or needle nose pliers. Two holes on opposite sides of the fastener allow the part to be squeezed and deformed into an oval shape. This action disengages the arms and allows the fastener to slide off the mating component without resistance.

First claim

1 . A unitary fastener, comprising:
a unitary body composed of resilient material, said body having a planar top with a circular periphery; a substantially rectangular opening through the center of the top, said opening having pairs of opposing short and long sides, the centerlines of which define minor and major axes of the fastener, respectively; an opposing pair of resilient arms upwardly and inwardly extending from the top, each arm affixed to one of the short sides of the opening along the major axis; and a plurality of outwardly and downwardly extending resilient fingers located on the periphery of the top.

2 . The fastener of claim 1 wherein the top has two through-holes, each located on an opposite side of the opening adjacent its longer sides along the minor axis, said holes having inward sides adapted to receive the application of an inwardly directed force whereby the fastener is distorted such that the tabs spread apart.

3 . The fastener of claim 2 wherein each of the arms has an arcuate jaw at its distal end.

4 . The fastener of claim 3 wherein each of the fingers is tapered radially.

5 . The fastener of claim 4 wherein the entire fastener is a unitary element composed of spring steel or stainless steel.

6 . The fastener of claim 5 wherein the fastener has the same thickness throughout.

7 . An assembly, comprising:
a first fastener member having a head and an elongate shank which extends from the head; and the fastener of claim 1 located about the shank such that the arms engage the shank and a residual clamp load is applied to the head.

8 . The assembly of claim 7 wherein the top has two through-holes, each located on an opposite side of the opening adjacent its longer sides along the minor axis, said holes adapted to receive the application of an inwardly directed force whereby the fastener is distorted such that the tabs spread apart.

9 . The assembly of claim 8 wherein each of the arms has an arcuate jaw at its distal end.

10 . The assembly of claim 9 wherein each of the fingers is tapered radially.

11 . The assembly of claim 10 wherein the entire fastener is a unitary element composed of spring steel or stainless steel.

12 . The fastener of claim 11 wherein the fastener has the same thickness throughout.

13 . The assembly of claim 7 wherein the fastener is approximately 3 mm in diameter.

14 . The fastener of claim 2 wherein the fingers are equally spaced about the periphery.

15 . The fastener of claim 2 wherein there are only two arms.

Assignees

• Penn Eng & Mfg Corp

Inventors

• Bentrim Brian G
• Brunk Jonathan

Classifications

• F16B2/245

  external, i.e. with contracting action · CPC title

• F16B5/0642

  the plates being arranged one on top of the other and in full close contact with each other · CPC title

• F16B21/076 Primary

  the socket having a resilient part on its outside (F16B21/075 takes precedence) · CPC title

• F16B21/07

  in which the socket has a resilient part {(F16B21/065 takes precedence)} · CPC title

• F16B21/20

  for bolts or shafts without holes, grooves, or notches for locking members {(by rings resilient in their plane F16B21/18)} · CPC title