Patent Publication Number: US-7722011-B1

Title: Jack extension system

Description:
BACKGROUND OF THE-INVENTION 
   Field of the Invention 
   The present invention relates to lifting devices and more particularly pertains to a new lifting device for increasing the effective lifting height of a jack. 
   SUMMARY OF THE INVENTION 
   The present invention meets the needs presented above by generally comprising a mechanical jack that has a vertical support and a foot mounted on the vertical support. The foot is moved upwardly or downwardly on the vertical support. The vertical support has an upper end. A bracket is removably attached to the upper end of the jack. The bracket has an opening extending therethrough. A post has a bottom end and a top end. The bottom end comprises a coupler that is removably attached to the foot. The top end comprises a plate. The post extends through the bracket and the plate is abuttable against an object to be lifted. 
   There has thus been outlined, rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood, and in order that the present contribution to the art may be better appreciated. There are additional features of the invention that will be described hereinafter and which will form the subject matter of the claims appended hereto. 
   The objects of the invention, along with the various features of novelty which characterize the invention, are pointed out with particularity in the claims annexed to and forming a part of this disclosure. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention will be better understood and objects other than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein: 
       FIG. 1  is a front perspective view of a jack extension system according to the present invention. 
       FIG. 2  is an expanded front perspective view of the present invention. 
       FIG. 3  is an expanded front perspective view of the present invention. 
       FIG. 4  is an expanded view of a post of the present invention. 
       FIG. 5  is a side view of the present invention. 
       FIG. 6  is a rear view of the present invention. 
       FIG. 7  is a front view of the present invention. 
   

   DESCRIPTION OF THE PREFERRED EMBODIMENT 
   With reference now to the drawings, and in particular to  FIGS. 1 through 7  thereof, a new lifting device embodying the principles and concepts of the present invention and generally designated by the reference numeral  10  will be described. 
   As best illustrated in  FIGS. 1 through 7 , the jack extension system  10  generally comprises a conventional mechanical jack  12  that includes a vertical support  14  and a foot  16  mounted on the vertical support  14 . The foot  16  is moved upwardly or downwardly on the vertical support  14  when the jack  12  is actuated. The vertical support  14  has an upper end  18 . 
   A bracket  20  is removably attached to the upper end  18  of the jack  12 . The bracket  20  has an opening  22  extending therethrough. A post  24  has a bottom end and a top end. The bottom end comprises a coupler  26  that is removably attached to the foot  16 . The top end comprises a plate  28 . The post  24  extends through the bracket  20 . The plate  28  is abuttable against an object to be lifted. 
   The post  24  includes a plurality of sections releasable from each other. The sections include a bottom section  30  that also includes the coupler  26 . A rod  32  is attached to and extends upwardly from the coupler  16 . A bottom cylinder  34  is provided and the rod  32  extends into the bottom cylinder  34 . The bottom cylinder  34  extends through the bracket  20 . A bar  36  has a pair of opposite ends  38 . A flange  40  is attached to the bar  36  and is positioned between the opposite ends  38 . The bar  36  extends into the bottom cylinder  34  and the flange  40  abuts an end of the bottom cylinder  34 . An upper cylinder  42  is provided and the bar  36  extends into the upper cylinder  42  and abuts the flange  40 . A shaft  44  has the plate  28  attached thereto. The shaft  44  has a distal end  46  with respect to the plate  28 . The shaft  44  is extendable into the upper cylinder  42 . 
   In use, when a user of the jack  12  has to lift an object which is raised a distance off of a ground surface where the jack  12  cannot properly reach it, the bracket  20  and the post  24  are mounted on the jack  12  so that the plate  28  may be used to lift the object. The post  24  includes releasable sections so that they may be interchanged as needed to vary the height of the post  24 . 
   With respect to the above description then, it is to be realized that the optimum dimensional relationships for the parts of the invention, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present invention. 
   Therefore, the foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.