Nut locking means and method for muffler clamps
United States Patent 1191 Hunckler 1451 Apr. 15, 1975 1 NUT LOCKING MEANS AND METHOD FOR MUFFLER CLAMPS [75] Inventor: Paul J. I-Iunckler, Huntington, Ind.  
 [73] Assignee: Hunckler Products, Inc.,  
 Huntington, Ind.  
 [22] Filed: Aug. 29, 1973 [21] Appl. No.: 392,658  
 [52] US. Cl. 151/20; 24/277; 151/35 [51] Int. Cl. Fl6b 39/24 [58] Field of Search 151/20, 34, 35, 41.5; 24/277, 284, 135 M [56] References Cited UNITED STATES PATENTS 240,387 4/1881 Cowdy 151/35 310,985 l/1885 Campbell 151/20 323,560 8/1885 Burdick 151/20 900,796 10/1908 Tambling.... 151/20 1,043,721 11/1912 Prince 151/34 1,387,085 8/1921 Whippey 151/20 3,126,934 3/1964 Marx 151/34 3,316,605 5/1967 Tabbert 24/277 FOREIGN PATENTS OR APPLICATIONS 268,681 4 1927 United Kingdom 151 35 501,432 3 1951 Belgium 151/20 Primary Examiner-Marion Parsons, Jr. Attorney, Agent, or Firm-Woodard, Weikart, Emhardt &amp; Naughton [5 7] ABSTRACT A flat circular washer is provided with a bulge on the nut facing surface thereof to impart a bind on the nut as it is tightened onto the bolt or stud passing through the washer, to lock the nut on the threads. Similarly, a muffler clamp is provided with bulges or humps on the nut facing surface thereof to tilt the nut and impose a binding action between the nut threads and the bolt threads, thus locking the nut in place.  
 3 Claims, 8 Drawing Figures NUT LOCKING MEANS AND METHOD FOR MUFFLER CLAMPS BACKGROUND OF THE INVENTION pensive. Also, where possible, it is desirable to avoid the necessity of using more than one part to lock a nut to a bolt, thus avoiding extra handling in assembly operations.  
  Some examples of prior art brought to light as a result of searching, are as follows:  
 1.326.279 MacLean Dec. 30, 1919 1,631,819 Ivory June 7, 1927 2,180,773 Simpson Nov. 21. 1939 2,363,319 Hanson Nov. 21, 1944 2,570,863 Rowe Oct. 9, 1951 2,923,190 lngwer et al Feb. 2, 1960 3,398,775 Morin Aug. 27, 1968 Of these patents, FIG. 3 of the Ingwer et a1. patent discloses a washer having a dimple 39 thereon, somewhat similar to that of my lock washer, but for a different purpose. Specifically, the dimple 39 of the Ingwer washer or ring 37 is intended to be received in a recess 40 in the end of a portion of the pipe vise disclosed in that patent, and is not for the purpose of locking a nut on a bolt. It is intended to prevent rotation of the friction ring 37. Some of the other patents listed above show means for tilting a nut, but I believe that none of them are quite as simple and inexpensive as mine.  
 SUMMARY OF THE INVENTION Described briefly, according to a typical embodiment of my invention, an apertured flat washer has a hump adjacent the aperture on one face thereof to impart a tilt and binding action on a nut engaging that face, with respect to a bolt extending through the washer. A further development of the invention provides humps adjacent apertures in saddle clamps for mufflers, and tail pipes and the like, to impose a tilt and therefor a binding action between the threads of a U-bolt and nuts securing the saddle clamp to the U-bolt.  
 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a circular apertured washer showing a typical embodiment of my invention.  
 FIG. 2 is another perspective view thereof.  
  FIG. 3 is a section therethrough taken at line 3-3 in FIG. 1 and viewed in the direction of the arrows.  
  FIG. 4 is a section through an apertured plate receiving a bolt through the aperture, the washer on the bolt, and a nut in close proximity to the washer as it is threaded onto the bolt.  
  FIG. 5 is a section like FIG. 4 showing in exaggerated form the tilt imposed by the washer on the nut as it is tightened onto the bolt and washer assembly.  
  Hg. 6 is an elevational view of a saddle clamp assembly showing one nut partially threaded onto the U-bolt,  
 DESCRIPTION or THE PREFERRED EMBODIMENT LII face of the saddle Referring now to the figures of the drawings, the  
 washer 11 is acirc&#39;ular apertured wsher havinga hump 12 formed therein as shown in these views. The washer is received over the end of a bolt 13 in the usual way and rests flat on the face 14 of a part of the assembly. The nut 16 threadedly received on the bolt has a lower face 17 facing the upper face of the washer. As the nut is tightened further onto the bolt 13, the lower face 17 thereof engages the upper extremity of the hump 12 to impose a tilt on the nut 16. Of course this tilt is exaggerated in the drawings. It imposes a locking action at the points 18, 19, and along the portions of the thread where the nut is being held up by the hump on the washer. These are indicated generally at 21. This provides the locking action desired.  
  In the embodiment of FIG. 6, the saddle clamp 25 is provided with humps 23 and 24 immediately adjacent to apertures therein receiving the threaded portions 26 and 27, respectively, of the U-bolt 22. The nut 28 is shown partially threaded onto the U-bolt and the nut 29 is shown threaded sufficiently onto it to engage and be tilted by the hump 23. It should be assumed that there is resistance to further advance of the saddle clamp in the direction of arrow 31, as would be the case with an exhaust pipe 32 therein, for example, to therebycause the nut to be tilted by the hump 23 as the saddle clamp, and therefore the hump thereon resists being moved in the direction of arrow 31.  
  FIG. 7 is a section showing the shape of the hump 23 to be essentially the same as in the washers of FIGS. 1 through 5. The pipe 32 is omitted from FIG. 7 to avoid confusion in the drawings.  
  While the invention has been disclosed and described in some detail in the drawings and foregoing description, they are to be considered as illustrative and not restrictive in character, as other modifications may readily suggest themselves to persons skilled in this art ing said first member, an inner portion of said nut, adjacent the thread on the fastener, engaging the upper face of said hump, engaging the flat surface of said member and thereupon imposing on said nut a tilted attitude with respect to said member and to said thread whereupon a binding action of said nut with respect to said thread and said member is obtained;  
 and said member being a saddle clamp having a pair 2. A saddle clamp having a generally U-shaped cross section with a flat upper surface and a pair of horizontally spaced apertures in the upper surface thereof;  
 a hump at the outer edge of each of said apertures and projecting from the surface thereof in a direction opposite the open end of the U, each said hump being positioned adjacent a location along the half of the perimeter of its associated aperture which is nearest the other said aperture.  
 3. The saddle clamp of claim 2 wherein: said humps are located on a line extending between the apertures thereof and slope from maximum offsets with respect to the top face to a flush condition with respect thereto as they extend toward each other.