Abstract:
A channel nut is attachable to a structural channel. The channel nut includes a nut portion having a planar surface and a resiliently flexible cone attachable to the nut portion. The cone includes an attachment portion for attachment to the planar surface of the nut portion, the conical portion extending conically from the attachment portion. The conical portion is defined by a conical wall having at least one slot therethrough to permit resilient deflection of the conical wall portion with respect to the attachment portion.

Description:
[0001]    This application claims priority to U.S. Provisional Application No. 60/253,782, filed on Nov. 29, 2000. 
     
    
     
       FIELD OF THE INVENTION  
         [0002]    The present invention relates generally to channel nuts for use with structural channels. More particularly, the present invention relates to an improved cone for fastening the channel nut to the channel.  
         BACKGROUND OF THE INVENTION  
         [0003]    Elongate structural members have long been used for various purposes in the construction industry. These structural members, which are commonly referred to as struts, include an elongate channel having a generally U-shaped configuration. The upper edges of the U-shaped channel include inwardly turned flanges or shoulders extending along the length thereof. These inwardly turned shoulders support fastening hardwares which allow for the attachment of various loads which may be supported by the struts.  
           [0004]    In order to permit attachment of loads to the strut, a threaded fastener or nut is positioned within the channel of the strut and secured thereto. Channel nuts of this type are shown, for example, in U.S. Pat. Nos. 3,483,025, 4,645,393 and 4,486,133. These channel nuts include a nut portion typically formed of metal having a generally rectangular configuration so that it may be inserted into the strut channel longitudinally beneath the inwardly turned flanges or shoulders. Thereafter, the nut portion is rotated approximately 90° to a transverse position so that it will engage the undersurface of the flanges.  
           [0005]    In order to locate and retain the nut portion within the channel, conventional channel nuts include an attached flexible cone typically formed of resilient plastic extending upwardly therefrom. The cone is snap fitted onto the nut portion and due to the flexibility, resiliency and the particular shape forming the cone, the nut portion is continuously urged into engagement with the underside of the inwardly turned flanges of the channel.  
           [0006]    In typical installation, as the nut is rotated to effect attachment, the cone slightly deforms or deflects to permit the nut portion to be captured by the inwardly turned flanges. The cone is returnable to its undeformed condition to provide a bias to hold the nut portion against the inwardly turned flanges. The deformability of the cone as well as its attachment to the nut portion is critical in providing the desired securement of the channel nut to the strut.  
           [0007]    It may be appreciated that the material forming the cone should be suitably flexible so as to permit ease of installation and retention of the channel nut within the strut. However, it has been found that if the cone is formed of a material which is too flexible, it may be difficult to retain the cone in an attached condition to the nut portion. During installation and use, it is possible that the cone can become detached from the nut portion rendering the channel nut useless. Attempts to form the cone of a harder material results in superior attachment of the cone to the channel nut, but renders installation of the channel nut more difficult as more manual force is needed to deflect the cone portion to effect installation.  
           [0008]    It is desirable to provide an improved channel nut having a cone which permits easy installation, yet remains captively attached to the channel nut portion.  
         SUMMARY OF THE INVENTION  
         [0009]    The present invention provides a channel nut for attachment to a structural channel which may be more easily and securely manually attached thereto.  
           [0010]    The channel nut of the present invention includes a nut portion having a planar surface. The resiliently flexible cone includes an attachment portion for attachment to the planar surface of the nut portion. The flexible cone further includes a conical portion extending conically outwardly from the attachment portion. The conical portion is defined by a conical wall having at least one slot therethrough to permit resilient deflectability of the conical wall with respect to the attachment portion.  
           [0011]    In the preferred embodiment of the present invention, the slot extending through the conical wall is T-shaped having a vertical slot portion extending along the conical wall in a transverse slot portion extending in a section therewith. The attachment portion of the flexible cone is snap fitted onto the planar surface of the nut portion. The conical portion further includes finger grips extending inwardly from the conical wall so as to permit manual rotation of the channel nut onto the channel.  
           [0012]    The channel nut is designed for use with a structural channel having a U-shaped cross section including upwardly extending sidewalls having inwardly turned upper flanges. The upper surface of the nut portion is engageable with the inwardly turned upper flanges of the channel sidewall. 
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0013]    [0013]FIGS. 1 and 2 show a top and side perspective views respectively of the improved channel nut of the present invention.  
         [0014]    [0014]FIGS. 4, 5 and  6  show front, bottom and top perspective views respectively of the channel nut of the present invention positioned over a portion of a structural member.  
         [0015]    [0015]FIGS. 7, 8 and  9  show respectively bottom, front and top perspective views of the channel nut of the present invention attached to the structural member. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0016]    An improved channel nut  10  of the present invention is shown in FIGS. 1 and 2. Channel nut  10  is designed for attachment to a structural member  12 , commonly referred to as a strut.  
         [0017]    As particularly shown in FIGS. 3 through 8, strut  12  is an elongate member typically formed of metal, having a generally U-shaped cross-sectional configuration. The U-shaped configuration is defined by a bottom wall  14  and a pair of upwardly extending spaced apart sidewalls  16  and  18 . Bottom wall  14  and the sidewalls  16  and  18  define an elongate channel  20 . The upper extents of sidewalls  16  and  18  include inwardly turned flanges  22  and  24  having downwardly directed edges  22   a  and  24   a  which, as will be described in further detail hereinbelow, provide for the attachment of channel nut  10 . Strut  12  is a conventional, structural member which is suspended within a building and is used to support mechanical and electrical devices.  
         [0018]    Referring more specifically to FIGS. 1 and 2, channel nut  10  is a two-part component, including a nut portion  30  and a cone  32 . Nut portion  30  is of conventional construction, having a generally rectangular body  34  typically formed of metal. Body  34  includes an internally screw-threaded central bore  36  for screw attachment of a bolt or similar fastening device (not shown). An upper surface  34   a  of body  34  includes a pair of spaced apart slots  38 , which are spaced apart a distance corresponding to the inwardly turned flanges  22  and  34  of strut  12 . Thus, when the nut portion  30  is inserted within the channel  20  of strut  12  and rotated, the edges  22   a  and  24   a  of inwardly turned flanges  22  and  34  will reside within slots  38 . To facilitate insertion and rotation of nut portion  30 , opposite diagonal corners  34   b  of body  34  may be rounded. As is known, slots  38  may include extending frictional gripping members  38   a  to facilitate securement of the nut portion to the edges of inwardly turned flanges.  
         [0019]    In order to provide resilient securement of channel nut  10  to strut  12 , cone  32  is secured thereto. Cone  32  is generally a plastic member which may be formed of resilient thermoplastic material. In the present invention, cone  32  may be particularly formed of nylon by injection molding or other suitable manufacturing technique. Cone  32  includes an upper conical portion  40  and a lower cylindrical portion  42 . Lower cylindrical portion  42  may be snap-fitted around an upwardly extending generally annular protrusion  44  extending from surface  34   a  of nut  30  about threaded bore  36 . The snap fit is sufficient to retain cone  32  on nut portion  30 . Conical portion  40  includes a pair of diametrically opposed finger grips  46  on an inner conical surface  41  thereof. Finger grips  46  permit manual rotation of the channel nut upon attachment to strut  12 .  
         [0020]    The conical portion  40  of cone  32  further includes a plurality of T-shaped slots  50  formed therein. Each slot  50  includes a vertical slot portion  50   a  and a transverse slot portion  50   b . The T-shaped slots  50  are arranged in equally rotationally spaced apart relationship about the cone. The T-shaped slots  50  provide enhanced flexibility to the cone so as to facilitate attachment of the channel nut  10  to the strut  12 . This enhanced flexibility is provided as the slots can compress under manual pressure caused by attachment of the channel nut  10  to strut  12 . The enhanced flexibility provided by slots  50  allows the channel nut  10  to more easily be attached to the strut  12 , yet provides the desired degree of resilient compression to hold the channel nut  10  against inwardly turned flanges  22  and  24  of strut  12 .  
         [0021]    The enhanced flexibility of the cone  32  provided by the slots  50  also allows the conical portion  40  of the cone to resiliently deflect without transmitting such deflection forces to the cylindrical portion  42  attached to the nut portion  30 . As the cone is deflected at the slots  50 , no stress is transmitted to the cylindrical portion  42 . This reduces the risk that upon installation of the channel nut  10 , the cone  32  will become dislodged from the channel nut  30 . As a result, the cone  32  may be formed of a more rigid material such as nylon without risk of detachment of the cone  32  from the nut portion  30 . A rigid material such as nylon produces a better snap-fit engagement between the cone and the nut portion.  
         [0022]    As shown particularly in FIGS. 1 and 2, the T-shaped configuration of slots  50  is preferred in that it provides enhanced flexibility of the cone when the cone is compressed in order to effect installation on strut  12 . The vertical portion  50   a  of slot  50  provides for enhanced radial inward compression of the cone. The transverse slot  50   b  allows compression of the cone inward and downward without transmitting the force of such compression to the cylindrical portion  42 .  
         [0023]    While the particular T-shaped configuration shown herein is preferred, other slot-like configurations may be provided in accordance with the present invention. Further, depending on the particular size of the channel nut  10 ,  4  T-shaped slots have been found to be preferable. It, of course, may be appreciated that other numbers and locations of slots may also be employed in combination with the present invention.  
         [0024]    It will be appreciated that the present invention has been described herein with reference to certain preferred or exemplary embodiments. The preferred or exemplary embodiments described herein may be modified, changed, added to or deviated from without departing from the intent, spirit and scope of the present invention, and it is intended that all such additions, modifications, amendment and/or deviations be included within the scope of the following claims.