Separable fastening device

• US 3,878,589 A
• Filed: 08/01/1974
• Issued: 04/22/1975
• Est. Priority Date: 08/01/1974
• Status: Expired due to Term

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Henry A. Schaefer
• Inventors: Schaefer, Henry A.
• Primary Examiner(s): Gelak, Bernard A.
• Application Number:
  US05/493,507
• Time in Patent Office: 264 Days
• Field of Search: 403/353 24/222R,222S,23TC,23NP,21A 248/223 224/5E,26R
• US Class Current: 24/669
• CPC Class Codes: A45F 2005/026 with a pin having an enlarged head detachably connected to a fastening device, e.g. to a pin receiving slot
• CPC Class Codes: A45F 5/02 Fastening articles to the garment
• CPC Class Codes: A45F 5/021 to the belt
• CPC Class Codes: Y10T 24/45812 and access opening with gapped perimeter for allowing movement of noninserted projection support therepast
• CPC Class Codes: Y10T 24/45995 having access opening with gapped perimeter for allowing movement of noninserted projection support therepast

Abstract

Two objects are fastened together by a device having a base plate with a cavity and an overhanging holder plate fastened to one object, and having a cylindrical stud with an overhanging flange fastened to the other object. The cavity, holder plate, stud, and flange are shaped so that the two objects must be oriented in a particular relation in order that the stud flange can be inserted into the cavity. After insertion, a slight relative rotation of the two objects fastens the two objects together in a pivotal relation.

Claims

1. A device for removably and pivotally fastening first and second objects together, comprising:

a. a base plate having a surface having a cavity therein, said cavity being bounded by a wall extending from a first point in the vicinity of one edge of said base plate in a first straight line to a second point, extending from said second point along a generally circular arc for approximately 225* to a third point, and extending from said third point along a second straight line that is parallel to said first straight line to a fourth point in the vicinity of said one edge;

b. a holder plate having an opening therethrough that is bounded by substantially parallel third and fourth straight lines extending from an edge of said holder plate to interior points and by a concave semicircular arc between said interior points, the distance between said third and fourth parallel straight lines and the diameter of said semicircular arc being substantially equal but being less than the distance between said first and second parallel straight lines;

c. means fastening said holder plate on said surface of said base plate in a position so that said fourth straight line substantially coincides with said second straight line, so that said semi-circular arc overhangs said cavity and is concentric with said generally circular arc, and so that said third straight line overhangs said cavity and is substantially parallel to said first straight line;

d. a cylindrical stud adapted to be fastened at one end to said second object, said stud having a diameter slightly less than said distance between said third and fourth straight lines to permit said stud to pass therebetween;

e. and a substantially flat, generally circular flange concentrically fastened to the other end of said stud, said flange having a thickness less than the depth of said cavity and having an edge formed by a straight line chord tangent to said cylindrical stud and by a circular arc between the ends of said chord, said circular arc having a diameter slightly less than the diameter of said circular arc of said cavity so that the circular part of said flange overhangs said stud.

2. The device of claim 1 wherein said cavity wall flares outward from said first and fourth points in diverging directions to said one edge of said base plate to facilitate insertion of said stud flange.

3. The device of claim 1 wherein said cavity wall diverges from a portion of said generally circular arc to provide notches, and wherein said device further comprises a resilient spring positioned in said notches to frictionally engage said stud flange.