Patent Abstract:
A steerable leveraged suspension suitable for a bicycle or electric Bicycle of motorized wheel hub design. Comprising of a vertical fork, which attaches to a bicycle frame front neck tube. The lower portion of said vertical fork is curved at its bottom to the rear of the frame neck head tube centerline, so as to improve steering trail geometry. The bottom of the curved fork is a pivot point to which pivot arms are attached. To the pivot arms the front wheel is attached forward of the pivot points by means of slots to which the front wheel Axel shaft fits into. Also two leveraging pivot arm extensions are attached. The leveraging arms provide a means of suspension leverage and a mounting point for brakes. For the purpose of suspension are rubber cord (bungee cord) and a compression damping spring of gas charge type.

Full Description:
BACKGROUND OF INVENTION 
   The present invention relates to a vehicle steerable suspension system particularly suitable for use on a Bicycle or an Electric powered Bicycle of Motorized Wheel Hub design. 
   Bicycle suspension systems have been around for well over 100 years going back to the early days of bicycles and continuing on into motorcycles. Some of the first front suspension systems designs being simple and somewhat effective in providing a means of shock absorptions. However some of these early designs did not fully explore the steering geometry in the terms of steering trail as did later or newer designs have utilized. 
   Many improvements have been made over the years some types have origins beginning with aircraft as with telescopic sliding fork tube type other types have there origins with motorcycles. 
   Some early designs which have external springs, such as Leading Link or Earls type, Girder type, springer type, to name just a few, some of which are still used on modern day motorcycles. In there present day form some are equipped with hydraulic shock absorbers externally mounted, their spring rates are designed for high speed usage and they do not take full advantage of leverage. Another type of design is the telescopic sliding fork tube type front suspension system, most of this type have internal springs and internal hydraulic shock absorbers, this type as used on modern day motorcycles are very effective at high speed and although tuned differently are quite effective on dirt trails. This same design found on many makes of bicycles today although with limited Travel and no hydraulic damping. They are adequate for there intended purpose, but are difficult To fine tune for differences in rider weights and road conditions. 
   All of the types of steerable suspension systems suitable for use on bicycles today typically do not make use of leverage in an economical and easily tuneable design. 
   SUMMARY OF THE INVENTION 
   In the presented invention of a bicycle steerable suspension, suitable for use on a bicycle or an electric powered bicycle of motorized wheel hub design. Presented is a light weight, low unsprung weight, steerable suspension system which can be made from inexpensive materials preferably steel or aluminum. This steerable suspension system is easily adaptable for different rider weights and various road conditions, such as smooth roads or a bumpy mountain trail. This is accomplished with the use of inexpensive rubber type cords or ‘bungee cord’ added or removed in varied number to suit road condition or rider weight. Also added a compression type damping spring for higher speed operation (above 30 m.p.h.) preferably gas charged type. The presented bicycle steerable suspension system also permits the use of side mounting rim contacting type brakes, as well as disc type brake systems. 
   The scope of the invention, a steerable suspension system suitable for use on a bicycle or an electric powered bicycle, which is attached to a standard type bicycle frame, neck head tube. This steerable suspension system comprising a forked section that fits in a vertical plain over the Wheel of which the said vertical fork is curved at its bottom to the rear of the said bicycle frame Neck head tube centerline so as to improve steering trail geometry in a front wheel steering suspension System. The bottom of said vertical fork has pivot bearings on each side of the wheel, these pivot Bearings which can be constructed of a plastic or bronze plain type or needle roller, they are attached to Pivot Arms a left and right by means of a welded on shaft one on each pivot arm and Secured by means of a threaded nut. The front wheel is attached forward of this said pivot point By means of slots to which the wheel Axle is attached by means of threaded nuts. To said pivot arms are attached Pivot Arm extensions, one is attached to the pivot arms to the rear of the pivot points and another is attached forward of the wheel axle, they are attached by means of nut and bolts. 
   In the presented invention of a steerable suspension system suitable for use on a bicycle or an electric-powered bicycle. The said vertical fork which is attached to a standard type bicycle frame neck tube at its upper portion and at its bottom by means of pivot points attached to pivot arms. The front wheel is attached to the pivot arms by the front wheel axle, to the ends of said pivot arms are attached pivot arm extensions one loops around the rear of the said wheel in a horizontal plain and another loops around the front portion of said front wheel in a plane approximately 45 degree between horizontal and vertical. The said pivot arm extensions loop around said wheel and bolt on each side of wheel to the said pivot arms. To the outer end portion of the said rear pivot arm extension near the circumference of the said wheel and to the upper portion of said vertical fork at a point located below the said bicycle frame neck tube are attached rubber cords (bungee cord)or extension springs for the purpose of a leveraged suspension system and shock absorption. To the outer end portion of the forward pivot arm extension near the said wheel circumference and to the upper portion of the said vertical fork via pivots at each end is attached a compression damping spring, preferable a light weight gas charged type for the purpose of a leveraged damping compression spring and shock absorption. 

   
     BRIEF DESCRIPTION OF DRAWINGS 
     The drawings presented are intended to illustrate, but not limit the invention&#39;s potential. The drawings contain four views. 
       FIG. 1  is a right side view of a bicycle fitted with the steerable leveraged suspension system as would be viewed at rest or being used on a smooth road. 
       FIG. 2  is a right side view of a bicycle fitted with the steerable leveraged suspension system as would be viewed at full compressed extension or as would be upon contact with a large bump. 
       FIG. 3  is a right side view of the steerable leveraged suspension shown without a bicycle frame or front wheel or disc brake mount. 
       FIG. 4  is a right side frontal view of the steerable leveraged suspension system shown without a bicycle frame or front wheel or brake mounts. 
       FIG. 5  is a sectional parts view of the steerable leveraged suspension system. 
   

   REFERENCE CHARACTERS 
   
     
       
             
             
           
         
             
                 
                 
             
           
           
             
                 
                1A, Rubber Cords (right side) 
             
             
                 
                1B, Rubber Cords (left side) 
             
             
                 
                2, Vertical Fork 
             
             
                 
                3, Rear Pivot Arm Extension 
             
             
                 
                4A, Pivot Arm (right side) 
             
             
                 
                4B, Pivot Arm (left side) 
             
             
                 
                5, Forward Pivot Arm Extension 
             
             
                 
                6, Pivot Point 
             
             
                 
                7, Compression type Damper Spring 
             
             
                 
                8, Front Wheel Axle 
             
             
                 
                9, Brake mount 
             
             
                 
               10, Compression spring mount 
             
             
                 
               11, Vertical Fork Neck 
             
             
                 
               12, assembly nuts, bolts 
             
             
                 
               13, Front Wheel 
             
             
                 
               14, Pivot Point Bolts 
             
             
                 
               15, Axle slot 
             
             
                 
               16, extension spring mounts 
             
             
                 
               17, Drive chain, or rubber belt 
             
             
                 
               18, rear wheel 
             
             
                 
               19, Bicycle Frame Neck Tube 
             
             
                 
               20, Disc Brake Caliper 
             
             
                 
               21, Disc, for Disc Brake 
             
             
                 
               22, Peddle Crank 
             
             
                 
               23, Bicycle Frame 
             
             
                 
               24, Handle Bar 
             
             
                 
               25, seat 
             
             
                 
                 
             
           
        
       
     
   
   DETAILED DESCRIPTION OF THE INVENTION 
   Referring to the drawings of  FIG. 1  thru  FIG. 5  illustrates the Steerable Leveraged Suspension system as shown in items  1 A thru  16 . The illustrations are to provide a means of description and are not intended to limit the scope of the present invention. 
   Further descriptions in  FIG. 2  to one who has knowledge in the art describes the Steerable Leveraged Suspension system, and to simplify understanding it is attached to a bicycle frame  23  to which is attached a rear wheel  18 , also shown is a disc brake system caliper  20  and disc  21 , a seat  25  crank peddles  22  a chain or toothed belt  17  and handlebars  24 . 
   The Steerable Leveraged Suspension system items  1  a thru  16  as viewed in  FIG. 2  can be appreciated by one skilled in the art, is attached to the bicycle frame  23  by means of the bicycle frame neck tube  19 ,  FIG. 2  into which fits the vertical fork neck  11 ,  FIG. 3  thru  FIG. 5  in typical bicycle fashion via ball bearings (not shown), for the purpose of steering movement. A comparison of illustrations in  FIG. 1  and  FIG. 2  shows the Steerable Leveraged Suspension system items  1 A thru  16  as viewed in  FIG. 1  to be at rest or as would be viewed on a smooth road.  FIG. 2  shows a comparison of the Steerable Leveraged Suspension system items  1 A thru  16  compressed or as would be viewed hitting a large bump. 
   A description of operation of the Steerable Leveraged Suspension system starts with the weight of the bicycle and rider, which rest upon the vertical fork neck  11  and its bearings (not shown) Which provide for movement in a left to right or side to side plane in a typical bicycle arrangement as one skilled in the art would appreciate, this vertical fork neck  11  and its bearing (not shown) connect to the rest of the bicycle by the frame neck tube  19   FIG. 2 , in a manner well known in the art. 
   The above mentioned vertical fork neck  11   FIG. 3  thru  FIG. 5  which is part of the vertical fork  2  is constructed as one piece by means of welding so as to provide strength, the mentioned vertical fork  2  is as its name implies, shaped in a fork manner in that it has two downward legs shown in  FIG. 4  at the bottom of each leg is a pivot point  6  which consists of a bearing of which different types could be used such as plain type bronze or plastic or more expensive ball or needle type bearings(not shown), also fitted into the pivot point bearings are pivot point bolts  14   FIG. 4  and  FIG. 5 . 
   The described above pivot point bolts  14  in which there are two, one for each leg of the vertical fork  2 , are attached to a pivot arm  4  of which there are also two  4 A, 4 B,  FIG. 3  thru  FIG. 5  a right side and a left side. The pivot point bolts  14  are welded or brazed to the inside of pivot arms  4 A and  4 B as viewed in  FIG. 4  the outer portion of the pivot point bolts  14  are threaded so as to be able to secure the pivot arms  4 A and  4 B  FIG. 4  to the vertical fork  2  by means of a threaded type locking nut, this provides for a removable pivoting connection. With reference to  FIG. 1  and  FIG. 2  the illustrations show a comparison of the up and down movement of the Steerable Leveraged Suspension system specifically in  FIG. 2  which shows pivot point  6  and its bearings (not shown) and with the pivot bolts  14  shown in  FIG. 4  and  FIG. 5  moving downward and the front wheel axle  8   FIG. 1  and  FIG. 2  moving upward as would be the situation having encountered upon an obstacle in the road. 
   The front wheel Axel  8   FIG. 1  and  FIG. 2  is attached to the front wheel  13   FIG. 1  and  FIG. 2  by means of bearings (not shown) and the ends of the front wheel axle  8   FIG. 1  and  FIG. 2  are threaded, to which a threaded nut is attached (not shown) for the purpose of securing the front wheel as would be well known in the art. 
   The above mentioned front wheel axle  8   FIG. 1  and  FIG. 2  fits into the axle slot  15   FIG. 3  thru  FIG. 5  located in pivot arm  4 A and  4 B  FIG. 3  thru  FIG. 5  the front wheel axle  8   FIG. 1  and  FIG. 2  is threaded at its ends so as to provide a means of securing the front wheel axle  8   FIG. 1  and  FIG. 2  into the axle slot  15   FIG. 3  thru  FIG. 5  which are located in pivot arms  4 A and  4 B  FIG. 3  thru  FIG. 5  and then securing with threaded nuts(not shown) at each end. 
   The next part of the Steerable Leveraged Suspension system is the rear pivot arm extension  3  which provides a means of leverage, as illustrated it is constructed in the shape of a U and constructed by a steel stamping with ribs or an aluminum casting or a means so as to be of sufficient strength so as to prevent bowing or flexing primarily so that the newer side mounting  9   FIG. 1  and  FIG. 2  rim contacting type brakes can be used as can be appreciated by one skilled in the art, also a disc type brake can be used items  20  and  21   FIG. 1  and  FIG. 2 . 
   The rear pivot arm extension  3  is attached to the pivot arms  4 A and  4 B  FIG. 3  thru  FIG. 4  by assembly nuts and bolts  12   FIG. 4  so as to provide for assembly and disassembly. 
   The rear pivot arm extension  3  provides for a means of leverage for the suspension system so as to use lighter weight and decreased tensioned extension type springs or as in the illustration drawings using inexpensive rubber cord (bungee cord)  1 A and  1 B  FIG. 3  thru  FIG. 5  the number of which being depends primarily on road conditions and rider weight. Two are used on average. 
   The above mentioned rubber cords  1 A and  1 B are attached to the rear pivot arm extension  3  and to the vertical fork  2  by means of the extension spring mounts  16  which are loops that are attached by bolting or welding which provide a simple means of attaching rubber cords  1 A and  1 B for the purpose of providing a sprung leveraged suspended movement or a suspension system. 
   Further description of the Steerable Leveraged Suspension system is the forward pivot arm extension  5  which provides a means of leverage, as illustrated it is constructed in the shape of a U and constructed by a steel stamping with ribs or an aluminum casting or a means so as to be of sufficient strength as to prevent bowing or flexing primarily so that the newer side mounting  9   FIG. 1  and  FIG. 2  rim contacting type brakes can be used as can be appreciated by one skilled in the art, also disc type brakes can be used items  20  and  21   FIG. 1  and  FIG. 2 . 
   The forward pivot arm extension  5  provides for a means of leverage for the suspension system so as to use a light weight compression type damping spring  7  gas type preferable, the compression type damping spring  7  aids in damping wheel oscillations when used on bumpy roads at higher speeds. 
   The mentioned forward pivot arm extension  5  and the vertical fork  2  have a compression spring mount  10 , a simple bracket for the purpose of attaching the compression type damping spring  7  between the vertical fork  2  and the forward pivot arm extension  5 . 
   A few other facts to mention about the illustration of the Steerable Leveraged Suspension system  1 A thru  16 , is the lever and fulcrum effect created by the pivot arm  4 A, and  4 B  FIG. 3  thru  FIG. 5  the rear pivot arm extension  3  and the forward pivot arm extension  5  all of which constitutes the lever, the fulcrum point being the front wheel axle  8   FIG. 1  and  FIG. 2  being supported against the ground by the front wheel  13   FIG. 1  and  FIG. 2 , the lever pushing upward against pivot point  6  this amplified levered effect along with the rubber cords  1 A AND  1 B that create a suspended lever effect along with the compression type damper spring make a very effective and economical suspension system. 
   Furthermore the bicycle frame neck tube  19   FIG. 1  And  FIG. 2  can be set at different angles to facilitate different handling characteristics as can be appreciated by one skilled in the art, an average angle being between  22  and  28  degree. Another note to mention is steering trail it is a measurement taken from the bicycle frame neck tube  19   FIG. 1  and  FIG. 2  centerline to the ground and a vertical line from the front wheel axle centerline to ground, the distance between the to lines at ground level is the amount of steering trail as can be appreciated by one skilled in the art. Some of the factors that affect this measurement being the amount of the bicycle frame neck tube  19   FIG. 1  and  FIG. 2  angle, the size of the front wheel  13   FIG. 1  and  FIG. 2  the length of the vertical fork  2  and the distance between the front wheel axle  8   FIG. 1  and  FIG. 2  and the pivot point  6 . Test models indicate that 89 mm (3.5″) between front wheel axle center  8   FIG. 1  and  FIG. 2  and pivot point  6 , a bicycle frame neck tube  19   FIG. 1  and  FIG. 2  angle of  26  degree a 26″ front wheel  13   FIG. 1  and  FIG. 2  and front fork  2  of 16″ in length will give an approximate at rest steering trail measurement of 4.5″ and upon compression approximately 3″. 
   Other facts to mention are that upon application of the brakes either disc type  20  and  21   FIG. 1  and  FIG. 2  or rim contacting type (not shown) there is an uplift instead of a dive to the suspension system which is appreciated upon hard braking. Another fact to mention is that this same up lift effect which is desirable, upon acceleration is obtained when an electric hub motor (not shown) is incorporated into the front wheel  13   FIG. 1  and  FIG. 2  of the Steerable Leveraged Suspension system  1 A thru  16 . 
   Although this invention has been described in the form of a preferred embodiment it should be understood by those skilled in the art, and that the present invention can be expanded beyond the specifically disclosed embodiment and can be used in alternate embodiments and uses, and obvious equivalents or modifications thereof. The invention is intended to be defined by the appended claims.

Technology Classification (CPC): 1