Weather tight blind fastener

• US 4,189,977 A
• Filed: 01/06/1978
• Issued: 02/26/1980
• Est. Priority Date: 01/06/1978
• Status: Expired due to Term

• Current Assignee: H.K. Porter Co., Inc.
• Original Assignee: H.K. Porter Co., Inc.
• Inventors: Hintz, Carman R., Jahns, Warren K.
• Primary Examiner(s): Bonck, Rodney H.
• Application Number:
  US05/867,463
• Time in Patent Office: 781 Days
• Field of Search: 85/70, 85/71, 85/72, 85/77, 85/78, 85/7, 85/8.8, 85/36, 85/1 JP, 85/50 R
• US Class Current: 411/34
• CPC Class Codes: F16B 21/20 for bolts or shafts without holes, grooves, or notches for locking members by rings resilient in their plane F16B21/18

Abstract

A weather tight fastener, for joining two or more adjacent members, having a flanged sleeve member which is disposed through aligned openings in the members and a rod member having an enlarged end, engaging a portion of the tubular member for collapsing the unflanged end of the tubular member in a controlled fashion. The end of the rod member which is not enlarged, projects from the flanged end of the tubular member and is engaged by a holding plate which is slidable in one direction only. Disposed between the slidable holding plate and the exposed surface of the members to be joined are a rigid washer and a resilient washer which are necessary for proper setting and providing a secure weather tight seal. The rigid washer has a counterbore of the same general size as the flanged end of the sleeve. The steel washer is disposed with the flanged end of the sleeve nested in the counterbore. The rod member includes a breakneck groove portion which breaks away from the rod member when the fastener is secured in place. When set the rod member is drawn through the sleeve member and the slidable holding plate is forced down the rod member to engage a portion of the rod member beneath the breakneck groove. The slidable plate member thus securely holds the rod member within and in engagement with the sleeve member when the fastener is in place. The surfaces to be joined are thus held both by the collapsed sleeve and also by the slidable plate member acting through the steel washer, which engages the surface outside of the sleeve flange area.

Claims

1. A blind weather tight fastener for joining together two or more members having aligned openings formed therethrough comprising:

a tubular member extending through the members to be joined having a flanged end portion which engages the outer member when the blind fastener is inserted through the aligned openings;

a mandrel having a headed portion, defining an annular surface engaging the unflanged end of said tubular member to cause controlled collapsing of the unflanged end of said tubular member when an axial setting force, relative to said tubular member, is applied to said mandrel;

a rigid metallic washer having a thickness greater than the thickness of the flange of said tubular member, having a counterbore formed in the center thereof to receive the flanged end of said tubular member, disposed on said mandrel with the flanged end portion of said tubular member positioned in the counterbore;

a circular retainer, slidable in one direction only, disposed over the end of said mandrel, which projects from the flanged end of said tubular member, to resiliently hold said mandrel within said tubular member when the fastener is set;

a resilient washer formed of resilient material sandwiched between said rigid metallic washer and said circular retainer having a diameter at least as great as said circular retainer and said rigid metallic washer; and

,

said rigid metallic washer having sufficient rigidity to transmit a holding force applied to its periphery to the flanged end of said tubular member to cause the collapse of said tubular member when the axial setting force is applied to the mandrel.

2. A blind fastener as claimed in claim 1 wherein:

said tubular member includes a reduced diameter portion extending from a position intermediate the ends thereof to the unflanged end; and

,

the reduced diameter portion of said tubular member is tapered towards its unflanged end so that the unflanged end of the tubular member has the smallest cross section.

3. A blind fastener as claimed in claim 2 wherein:

the taper formed on the reduced diameter portion of said tubular member is 1/2°

.

4. A blind fastener as claimed in claim 1 wherein:

the portion of said tubular member extending through the members to be joined is of sufficient length so that when an axial force is applied to said mandrel the free end of said tubular member collapses into a plurality of pleats; and

,

said tubular member constructed so that as an axial force is applied to the mandrel to form the plurality of pleats the first pleat starts at the free end of the tubular member in contact with the annular surface of the mandrel and the pleats are sequentially formed from the free end of the tubular member towards the flanged end until the material to be joined is secured at one end by the flanged end of the tubular member and at the other end by the last pleat to be formed.

5. A blind fastener as claimed in claim 4 wherein:

the diameter of each of the plurality of pleats formed after the first pleat is of a slightly larger diameter than the preceding pleat formed.

6. A blind fastener as claimed in claim 1 wherein:

the annular surface formed on the headed portion of the mandrel slopes from the outer periphery towards the center and headed end of said mandrel;

said tubular member includes a reduced diameter portion extending from a position intermediate the ends thereof to the unflanged end; and

,

the reduced diameter portion of said tubular member tapers to the unflanged end.

7. A blind fastener as claimed in claim 6 wherein:

the sloped portion of the annular surface is 5°

relative to the perpendicular of the longitudinal axis of said mandrel.

8. A blind fastener for joining at least two members comprising:

a sleeve, having one end flanged, projecting through an opening formed in the materials to be joined with the flanged end contacting the outside member through which the fastener is installed;

a rod extending through said sleeve, having an enlarged head portion disposed outside of the unflanged end of said sleeve, for partially collapsing said sleeve when an axial force is applied thereto;

a rigid metal washer, having a counterbore formed therein, disposed around the portion of said rod extending from the flanged end of said sleeve with the flange of said sleeve disposed within the counterbore;

a spacer of resilient material disposed around said rod in contact with said rigid metal washer;

a retaining member disposed around said rod to permit said rod to move in one direction only, along its longitudinal axis, with respect to the retaining member and,

said rigid metal washer engaging and holding in place the flanged end of said sleeve when force is applied to said rod relative to the periphery of said rigid metal washer to set the blind fastener.

9. A blind fastener as claimed in claim 8 wherein:

said rigid metal washer, said spacer of resilient material, and said retaining member, are all circular and of approximately the same diameter.

10. A blind fastener as claimed in claim 8 wherein:

said sleeve member is constructed to collapse into a plurality of circular pleats as an axial force is applied to said rod.

11. A blind fastener as claimed in claim 9 wherein:

the diameters of the plurality of pleats formed when the blind fastener is set decreases from the pleat engaging the material to be joined to the pleat engaging the enlarged rod head.

12. A blind fastener as claimed in claim 11 wherein:

the enlarged head portion of said rod defines an annular surface; and

,

when the blind fastener is set the first pleat formed in said sleeve is formed at the end of said sleeve engaging the annular surface of said rod and the last pleat formed engages one of the members to be joined.

13. A blind fastener as claimed in claim 12 wherein:

said sleeve includes a tapered portion extending from a point intermediate the ends thereof to the unflanged end; and

,

the annular surface of said rod is undercut for gripping and positioning the unflanged end of said sleeve.

14. A blind fastener as claimed in claim 13 wherein:

the tapered portion of said sleeve is formed on a portion of the sleeve which is of a reduced wall thickness.

15. A blind fastener as claimed in claim 14 wherein:

the taper formed on said sleeve is 1/2°

; and

,

the undercut on the headed portion of said mandrel has a 5°

slope.

16. A blind fastener comprising:

a mandrel having one end enlarged to define an annular surface around the mandrel;

a sleeve disposed around a portion of said mandrel having an unflanged end facing the annular surface of said mandrel and a flanged end separated from the enlarged end of said mandrel;

a rigid metal washer disposed around said mandrel having a counterbore formed therein for receiving the flanged end of said sleeve and for transmitting a setting force applied to its periphery to the flanged end of said sleeve;

a resilient washer disposed around said mandrel in proximity to said rigid metal washer; and

,

a plate member slidable in one direction only disposed around said mandrel to sandwich said resilient washer between itself and said rigid metal washer.

17. A blind fastener as claimed in claim 16 wherein:

the annular portion of said mandrel slopes from its outside circumference towards the longitudinal center and the enlarged end of said mandrel.

18. A blind fastener as claimed in claim 17 wherein:

the slope of the annular portion of said mandrel is 5°

with respect to a perpendicular from the longitudinal axes.

19. A blind fastener as claimed in claim 18 wherein:

said sleeve has a reduced diameter portion formed intermediate the ends thereof extending to the unflanged end.

20. A blind fastener as claimed in claim 19 wherein:

said sleeve slope is 1/2°

with respect to the longitudinal axes of said mandrel.

21. A blind fastener as claimed in claim 16 wherein:

said rigid metal washer, said resilient washer, and said plate member are all circular and of approximately the same diameter.

22. A blind fastener as claimed in claim 21 wherein:

said sleeve is formed of hot-rolled steel.

23. A blind fastener as claimed in claim 21 wherein:

said sleeve is formed of aluminum.

24. A blind fastener as claimed in claim 16 wherein:

the flange formed on said sleeve is circular and flat on the top and bottom; and

,

said rigid metal washer is flat and circular.

25. A blind fastener as claimed in claim 24 wherein:

the diameter of said rigid metal washer is at least 21/2 times the diameter of the flanged end of said sleeve.

26. A blind fastener as claimed in claim 24 wherein:

said resilient washer and said plate member are circular and of the same diameter as said rigid metal washer.

27. A blind fastener for joining a plurality of surfaces having aligned openings formed therethrough comprising:

a sleeve extending through the aligned openings having a flanged end for engaging the surface through which it is inserted and an unflanged end projecting from the surfaces;

a mandrel extending through said sleeve having a headed portion with an annular surface which engages the unflanged end of said sleeve for collapsing a portion of said sleeve when a relative axial force is applied thereto and having a portion which extends from the flanged end of said sleeve when the rivet is set;

holding means for holding the portion of said mandrel, which extends from the flanged end from one of the surfaces when the rivet is set, from one of the surfaces to be joined;

said sleeve having a reduced diameter portion formed intermediate its end and extending to the unflanged end;

the reduced diameter portion of said sleeve being tapered and of sufficient length so that when the rivet is set said sleeve collapses and three or more pleats are formed; and

,

said holding means comprises a rigid washer having a counterbore for receiving the flanged end of said sleeve and for holding said sleeve in place when the blind fastener is set;

a retaining member disposed around said mandrel to permit said mandrel to move in one direction only, along its longitudinal axis, with respect to said retaining member; and

, a spacer of resilient material disposed around said mandrel between and in contact with said rigid washer and said retaining member.