Stand-off for retractable screw fastener

• US 3,204,680 A
• Filed: 02/04/1963
• Issued: 09/07/1965
• Est. Priority Date: 02/04/1963
• Status: Expired due to Term

• Current Assignee: John K. Barry
• Original Assignee: John K. Barry
• Inventors: Barry, John K.
• Application Number:
  US04/256,078
• Time in Patent Office: 946 Days
• US Class Current: 411/349
• CPC Class Codes: F16B 41/002 Measures against loss of bolts, nuts or pins devices for fastening nuts to surfaces F16B37/04
• CPC Class Codes: Y10S 411/999 with retainer, e.g. tether
• CPC Class Codes: Y10T 29/4992 by flaring inserted cup or tube end
• CPC Class Codes: Y10T 29/4994 Radially expanding internal tube

Claims

1. A RETRACTABLE SCREW FASTENER FOR DETACHABLY CONNECTING TWO STRUCTURAL MEMBERS TOGERHER, SAID FASTENER COMPRISING A RETRACTABLE STUD HAVING (A) TREADS OF A FIRST DIAMETER LOCATED AT ONE END FOR ENGAGING THE SECOND STRUCTURAL MEMBER WHEN THE STUD EXTENDS THROUGH A BORE IN THE FIRST STRUCTURAL MEMBER, (B) A HEAD LOCATED AT THE END OF THE STUD OPPOSITE THE THREADS, SAID HEAD BEING LARGER IN DIAMETER THAN THE THREADS AND HAVING A FLAT, AXIALLY DIRECTED ABUTMENT SURFACE SURROUNDING THE STUD WHERE IT JOINS THE HEAD, AND (C) A STUD SMOOTH PORTION LOCATED BETWEEN THE THREADS AND THE HEAD WITH A DIAMETER SMALLER THAN THAT OF THE THREADS, AND A LOAD-BEARING, STAND-OFF BUSHING ANCHORED AT ONE END TO THE FIRST STRUCTURAL MEMBER THROUGH A BORE THEREIN AND PROVIDING AT ITS DISTAL END A STAND-OFF SUPPORT UPON WHICH THE LARGER DIAMETER ABUTMENT SURFACE OF THE STUD HEAD PRESSES AFTER THE STUD IS ENGAGED WITH THE SECOND STRUCTURAL MEMBER, SAID BUSHING BEING GENERALLY TUBULAR IN SHAPE AND HAVING (A) A FLARED INNER END WHICH GRIPS THE INNER SURFACE OF THE FIRST STRUCTURAL MEMBER THROUGH A BORE THEREIN, (B) AN OUTWARDLY EXTENDING FLANGE LOCATED CONTIGUOUS THE OUTER SURFACE OF THE FIRST STRUCTURAL MEMBER WHEN THE BUSHING IS OPERATIVELY POSITIONED, SAID FLARED INNER END AND FLANGE GRIPPING THE FIRST STRUCTURAL MEMBER THEREBETWEEN, (C) A STUD HEAD, STAND-OFF ANNULAR SUPPORT PORTION LOCATED AT THE DISTAL END OF SAID BUSHING FORMED BY DOUBLING THE WALL OF THE BUSHING INWARDLY ALONG THE AXIS OF THE BUSHING, (D) AN INWARDLY DIRECTED FLANGE FORMED FROM PART OF THE DOUBLED-WALL PORTION LOCATED WITHIN THE BORE OF THE BUSHING, SAID FLANGE POSITIONED WITHIN THE TWEEN THE STUD THREADS AND THE STUD HEAD WHEN THE STUD IS OPERATIVELY POSITIONED WITHIN THE BUSHING, AND (E) MEANS LOCATED ON THE STUD HAVING A DIAMETER LARGER THAN THE BORE OF THE INNER FLANGE FOR RETAINING THE STUD IN THE BUSHING WHEN THE STUD IS NOT ENGAGED IN THE SECOND STRUCTURAL MEMBER.