Abstract:
A bicycle mechanism to permit a forward force to be applied to the bicycle&#39;s drive wheel by backward rotation of the bicycle&#39;s pedals in addition to permitting a forward force to be applied to the drive wheel by a forward rotation of said pedals. A preferred embodiment allows one of the pedals to be rotated in one direction while the other pedal rotates in the opposite direction.

Description:
This invention relates to pedal powered devices and in particular to bicycles and pedal powered exercise equipment. 
     BACKGROUND OF THE INVENTION 
     Bicycle riding is excellent exercise. Vigorous biking is wonderful for general body health in that it produces increased heart pumping to supply increased blood to the large leg muscles. There is not the constant leg impact associated with jogging. 
     In the basic bicycle design, a chain sprocket on the rear wheel of the bicycle is driven by a bicycle chain through a chain sprocket powered by a pedal shaft driven by the legs and feet of the bicyclist operating on a pair of bicycle pedals attached to the pedal shaft. 
     For the typical bicycle to move in the forward direction, the bicyclist applies force to the pedals causing them to rotate in the same rotational direction as the wheels of the bicycle for forward motion. (This rotational direction is hereinafter referred to as the &#34;forward direction&#34;. The reverse direction is hereinafter referred to as the &#34;reverse direction&#34;. In some cases we will refer to rotational direction of various parts of the bicycle as either clockwise or counter-clockwise. In such cases it will be assumed that we are viewing the bicycle from its right side, and in all of the figures we will be viewing the bicycle and the bicycle parts from the right side.) Typical bicycles in use today do not operate in reverse. For these bicycles the pedals can be rotated in the counter-clockwise direction when the bicycle is moving forward, but such motion provides no force to the wheels of the bicycle. Thus, with prior art bicycles, force can be applied to the wheels of the bicycle only by rotating the pedals in the forward direction. Normally force is applied to the rear wheel only on the downward stroke of the pedals; however it is fairly common practice for bicyclists to clamp their shoes to the pedals. Then force can also be applied to the rear wheel on the upward stroke of the pedals. 
     With prior art bicycles there is no way to apply forward force to the wheels of the bicycle with a reverse motion of the pedals. Such an improvement would increase the value of the bicycle as an exercise device and also provides an alternate method of propulsion emphasizing use of different leg and related muscles which would increase endurance for long bike trips. 
     What is needed is a bicycle mechanism which will permit the bicyclists to apply forward driving force to the wheels of the bicycle with both forward and reverse motion of the pedals to obtain these performance enhancements. 
     SUMMARY OF THE INVENTION 
     The present invention provides a bicycle attachment to permit a forward force to be applied to the bicycle&#39;s drive wheel by reverse rotation of the bicycle&#39;s pedals in addition to permitting a forward force to be applied to the back wheel by a forward rotation of said pedals. A preferred embodiment allows the pedals to be rotated in opposite directions. 
     The present invention is well suited to provide a wide range of exercise routines for the user in order to tone thighs, hamstrings, calfs, abdominal, back and various upper front and side-body muscles. The invention provides reverse conventional pedaling, forward reciprocal pedaling, reverse reciprocal pedaling, kangaroo or pogo-stick pedaling, counter (alternating forward and backward) pedaling. 
     The invention is unobtrusive, barely visible from the right side of the bicycle. It is very light weight and can be easily installed on most existing bicycles or incorporated into the design of new bicycles. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIGS. 1A and 1B are two views showing a preferred embodiment of the present invention. 
     FIGS. 2A and 2B are two views showing a preferred embodiment. 
     FIGS. 3A and 3B are two views showing a preferred embodiment. 
     FIG. 4 shows a configuration of spur gears. 
     FIGS. 5 and 6 show a kinetic modes switching unit where forward or reverse pedaling and relative pedal positions are selected from the bicycle handlebar. 
     FIG. 7 shows a variety of pedaling positions. 
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Forward Motion with Forward or Reverse Pedaling 
     FIGS. 1A and 1B describe an embodiment of the present invention which provides for forward motion of the bicycle with either forward or reverse rotation of the pedals. This embodiment is provided by adding specified equipment to a standard bicycle. The additional equipment is depicted within the dashed line 1 on FIG. 1A. Standard bicycle parts relevant to this invention are shown in the figures are left pedal 2 and right pedal 3, pedal arms 4 and 5, pedal shaft 6, front wheel 8, drive wheel 10, seat tube 12, down tube 14, drive chain 13 and pedal sprocket 15. 
     In this embodiment pedal shaft 6 has been extended with an 29 so that the gear equipment shown on FIG. 1A can be added. Added parts are a first bevel gear 16, a second bevel gear 18, and a third reversing bevel gear 20. Reversing gear 20 is gear matched to gears 16 and 18 and rotates on reversing gear shaft 22 which rotates within bearings 24 mounted in frame 26 which is attached to down tube 14 by clamp 28. Gear 16 is mounted on freewheeling clutch 17 which causes gear 16 to rotate freely in the counter-clockwise direction about shaft 6 but rotate with shaft 6 in the clockwise direction. Gear 18 is mounted on freewheeling clutch 19 which causes gear 18 to rotate freely in the clockwise direction about shaft 6 but rotate with shaft 6 in the counter-clockwise direction. Gear 16 is attached to pedal sprocket 15 by fastener 30. 
     Both pedals are connected to the pedal shaft 6 in the normal manner but pedal sprocket 15 rotates about shaft 6 on bearing 11. Clockwise motion of the pedals causes gear 16 to rotate clockwise which causes chain sprocket 15 to rotate clockwise driving chain 13 clockwise and the bicycle forward. Gears 20 and 18 rotate freely with no significant loss of energy or total bicycle efficiency. Counter-clockwise rotation of the pedals causes gear 18 to rotate counter-clockwise which, through reversing gear 20, causes gear 16 to rotate clockwise which again causes clockwise chain sprocket 15 rotation and forward bicycle motion. Due to some small gear losses there is some reduction in total bicycle efficiency but not much. We estimate this efficiency loss in the gears to be practically imperceptible. 
     Thus, with this improvement the bicyclist can pedal alternatively clockwise or counter-clockwise. This variety of the pedal rotation utilizes the leg and related muscle groups in slightly different ways which increases overall endurance and makes traveling long distances easier for the bicyclist. 
     Gears 16 and 18 are preferably sized to fit within the diameter of the existing crankcase. Persons skilled in the art will recognize that many other gear arrangements and sizes which would work effectively. An appropriate housing for the gears should be provided using techniques well known in the art. 
     Kangaroo Stroke 
     FIGS. 2A and 2B shows a slightly different embodiment using the same parts described above. This embodiment is the same as that shown in FIGS. 1A and 1B except both pedals are positioned to be parallel to each other. In this embodiment the bicyclist&#39;s shoes must be firmly attached to the pedals. Commercially available equipment can be used to clamp the shoes to the pedals. Up and down motions are used to propel the bicycle. If desired limiters can be provided at 2:00 and 4:00 o&#39;clock. 
     Alternatively the limiters can be arranged in other positions to provide a great variety of back and fourth, clockwise or counter-clockwise leg motions are possible. Many of these options provide great exercise for the abdominal and gludteal and related muscles. 
     Stair Climbing 
     FIGS. 3A and 3B show an embodiment which provides for forward bicycle motion with the pedals reciprocally rotating in opposite directions. The alternating motions can be started from any major quadrant. This embodiment contains the parts shown in FIGS. 1A and 1B and the following additional parts: a fourth bevel gear 32, a fifth bevel gear 34 (similar to gears 16 and 18), and a sixth reversing idler gear 40. Reversing idler gear 40 is matched to gears 32 and 34 and gear 40 rotates on reversing shaft 42 which in turn rotates within bearing 44 mounted in frame 2. Gear 32 is fixedly mounted on shaft 6 and gear 34 rotates freely about shaft 6 on bearing 36. Right pedal arm 5 also rotates freely about shaft 6 on bearing 47. Because of the arrangement of gears 32 and 34, pedals 2 and 3 must of necessity rotate in opposite directions. Since gear 32 is engaged in gear 34, pedal 2 rotates in the same direction as shaft 6 and pedal 3 rotates in the direction opposite of the direction of rotation of shaft 6. For reasons explained above, reciprocating motion or rotation of either of the pedals in either direction will produce forward motion of the bicycle. This embodiment is excellent for stair climbing type of leg motion to exercise gluteal and greater hamstring muscles in addition to the other leg muscles. A limiter could also be engaged for limiting the alternating pedal movement between 7:00 and 11:00 o&#39;clock and 1:00 to 5:00 o&#39;clock. 
     Connecting the pedal arm 5 to flange 46 instead of gear 34 permits operation of the bicycle in a continuous mode as described in the two previous sections. 
     Exercise Bicycle 
     The bicycle could be mounted on a stationary exercise frame such as units marketed by Minoura and Blackburn Corporations. As a result most regular bicycles can be converted to a multiple variation exercise machine providing a very wide variety of exercise options. 
     Relative Pedal Positions 
     Persons skilled in the art will note that in all of the embodiments of the present invention discussed above, the pedals rotate at the same speed either in the same direction or different directions. In either case the relative starting positions can be important. These starting positions can be established in a wide variety of ways such as fixing the pedal arm at specific relative positions on pedal shaft 6 or on gear 34 or on flange 46. 
     Remote Adjustment of Pedal Position and Relative Pedal Rotation 
     It is feasible to provide for selection of relative pedal positions and relative direction of rotation at the will of the bicyclist while riding down the road. This can be done with a clutch-cable arrangement with controls at the handlebar as is shown in FIGS, 5 and 6. As shown in FIG. 5, the basic arrangement of the pedal shaft and the gears is the same as shown in FIGS. 3A and 3B, Positional discs 50 and 52 have been added along with control disc 54 and pins 56. Positional disc 52 is attached to gear 34 and turns freely on pedal shaft 6. Positional disc 50 is permanently attached to pedal shaft 6. Pedal crank 5 rotates freely on shaft 6 and through prongs 58 is slidably coupled to control disc 54. Axial movement of the control disc 54 along the shaft 6 is caused by shifting mechanism 62 which is remotely actuated through lever 64 mounted on the handlebar 66. Boden cable 68 provides the link between actuator 64 and the shifter 62. FIG. 6 shows a side view of the positional discs 50 as well as control disc 54. Positional discs 50 and 52 have four holes equally spaced from the central axis of the pedal shaft and represent the four major quadrants. Control disc 54 has two pins 180 degrees apart matching the holes in positional discs 50 and 52. The rim of control disc 54 is held in a particular position by shifting mechanism 62 through a slidable joint 63. As the bicyclist moves shifter 64, control disc 54 is axially displaced to either side O or S. With shifter 64 at &#34;0&#34; engaging pins 56 engage into positional disc 52 for alternating pedaling (the right side pedal moves in the rotational direction opposite that of the left pedal and the pedal shaft), and with shifter 64 at S engaging pins engage into positional disc 50 for continuous forward or reverse pedaling (the right side pedal moves in the rotation direction in the same direction as the pedal shaft and the left pedal). While shifter 64 is in the neutral position N the pedals can be moved to any position relative to each other. 
     Wide Variety of Options 
     FIG. 7 summarizes some of the wide variety of pedaling options available with this invention. 
     Other Gear Arrangements 
     Although the present invention has been described above making use of bevel gears, persons skilled in this art will recognize that many other gear arrangement could be used with essentially equivalent results. One preferred alternative would be to use spur gears to achieve the reversing effects described above. FIG. 4 is a sketch demonstrating how the reversing effects are achieved with spur gears. Drive shaft 5 comporting gear 71 engages idler gear 72 rotating on shaft 77. Gear 72 being of an enlarged width to that of gears 71 and 74. ldlet gear 73 which rotates on shaft 78 engages idler gear 72 as well as idler gear 74. Idler gear 73 being of an enlarged width compared to gears 71 and 74. Output shaft 76 is affixed to gear 74 and is concentric to input shaft 75. Spacing between idlers and gears 71 and 74 are such that they never interlock themselves with each other, in this way achieving concentric reverse rotation between input shaft 85 and exit shaft 6. Persons skilled in the art will also recognize that these reversing effects can also be accomplished with a chain and sprocket arrangement. In fact Applicants built their first proof of principal demonstration model using a chain and sprocket unit which worked reasonably well. 
     While the above description contains many specificities, the reader should not construe these as limitations on the scope of the invention, but merely as exemplification&#39;s of preferred embodiments thereof. Those skilled in the art will envision many other possible variations which are within its scope. Accordingly the reader is requested to determine the scope of the invention by the appended claims and their legal equivalents, and not by the examples which have been given.