Abstract: A gear shifting system (1) particularly characterized in that the values required for displacement of the gear-shifting elements(s) (e.g. front changer (Y1) and rear changer (Z1)), are applied to each program (s) (e.g.: indexed or non-indexed multibossed cam(s) which is/are integrated into at least one gear shifting elements (Y1) and/or (Z1). Preferably, the system is provided with more than one program (e.g. a cam for the front changer and a cam for the rear changer, both of which can be combined to form a single changer (preferably, a front changer), the programs being synchronized directly or indirectly, e.g. by a single control elements (X) (e.g. an indexed or non-indexed handle) acting via transmission elements (e.g. cables (4A) and (5A) cooperating with casings (6)). The system the performance of the changers by organizing, i.e. synchronizing, the gear ratios via a disk/drive pinion combination potential.

Abstract: A bicycle drive system includes a front gear face, a rear gear face, a front guide assembly, a rear guide assembly, and a drive shaft coupled to a rear-suspension frame via a rear hub and a crank spindle. The bicycle drive system operates independently of the frame. Shifting from one gear to another is controlled by a shift controller. Each shift of the shift controller shifts both the front and rear guide assemblies at the same time. The shift controller is preferably coupled to the front and rear guide assemblies via a cable system.

Abstract: The Abdomicycle is a three or four-wheeled vehicle, (depending upon vehicle model) on which a rider sits upon a seat, leans back against a backrest which is provided for comfort and safety purposes and propels the vehicle either forward or reverse by a reciprocating motion on a bar that encloses them as they sit on the Abdomicycle. The bar is connected to either the single or dual rear wheels via a crank type mechanism that allows the linear pushing/pulling of the bar from front to back to be converted into a circular motion for the purpose of driving the rear wheel or wheels. The occupant's feet rest upon a forward steering linkage system that allows either foot pressure, or the leaning position of the occupant's body to turn the vehicle to the right or left. The vehicle includes a braking system connected by cable to the wheel(s) for the purpose of stopping the vehicle. The Abdomicycle is designed as a manually powered vehicle for exercises.

Abstract: A bicycle shift control device comprises a traveling state detecting circuit that detects a traveling state of the bicycle and a manually operated switch that outputs a switch signal. A shift control circuit provides a control signal, in response to the switch signal provided by the operation of the switch, for setting the speed stage of a bicycle transmission to correspond to the range of traveling states that contains the detected traveling state.

Abstract: A digitally encrypted audio signal may be transmitted with an analog television signal. Access to the analog television video signal may be controlled by using graphics overlay techniques. The use of digital encryption techniques on the audio channel prevents improper interception.

Abstract: A motorized bicycle derailleur assembly is provided with a motor unit, a derailleur, and a motor linkage. The motor unit rotates an output shaft in first and second rotational directions to shift the derailleur. The derailleur includes a fixing body, a chain guide and a derailleur linkage operatively coupled between the fixing body and the chain guide to move between a first shift position and a second shift position. The motor linkage is operatively coupled to the output shaft of the motor unit and the derailleur linkage to move the chain guide from the first shift position to the second shift position upon rotation of the output shaft in the first rotational direction and move the chain guide from the second shift position to the first shift position upon rotation of the output shaft in the second rotational direction.

Abstract: A bicycle shift control device is adapted to be mounted to a bicycle equipped with an alternating current generator and a shifting device having a plurality of speed steps. The shift control device includes a power storage unit adapted to store electrical power from the alternating current generator; a shift control element operatively coupled for receiving electrical power from the power storage unit and for providing shift control signals for controlling the operation of the shifting device; and a case adapted to be mounted to the bicycle, wherein the case houses both the power storage unit and the shift control element.

Abstract: A bell crank for a bicycle hub transmission includes a wire connecting bell crank member for connecting to a control wire, an actuator moving bell crank member for moving an actuating member, and an adjusting mechanism for adjusting a position of the wire connecting bell crank member relative to the actuator moving bell crank member.

Abstract: A mobile accommodation unit in container form for use as mobile hospital or mobile control or command center or the like has a box-shaped main box element and at least one secondary box element. In a transport state, the secondary box element is telescoped into the main box element. For setting up an accommodation unit of increased floor area, the secondary box element can be pulled out of a lateral opening of the main box element. In order to provide a continuous floor surface, after the secondary box element has been pulled out, the main box element has a movable floor element, which can be lifted relative to a basic floor element so as to equalize the floor levels of the main box element and the secondary box element.

Abstract: This transmission operates by use of a drive shaft, that by being extendible and retractable, can vary in length. Gears on each end of the drive shaft deliver power from one of a number of concentric rings of gear teeth on a pedal drive to a similar arrangement on a wheel drive. The drive shaft by moving between these concentric rings can vary the gear ratios of the power delivered. A cam wheel and spring mounted ball bearings are employed to change the length of the drive shaft and especially, lift the drive shaft off of the pedal drive/wheel drive as it disengages and set it down to engage the next set of concentric gears. An alternative method to the use of a cam wheel that performs the same function is also described. This allows a radial taper to all engaging gears and a deeper seat.

Abstract: A bicycle with a forward and backward pedaling system which drives a bicycle forward in either a forward or a backward pedaling.

Abstract: A control system for an automatic shifting bicycle transmission comprises a control unit that communicates with a memory location. The memory location stores a plurality of shift tables. The control system uses the information in the shift tables to shift gears with a powered shifting device. The powered shifting device can be manipulated using shift switches in a manual operating mode. The shift switches also are used to switch between the plurality of shift tables.

Abstract: The present invention relates to a vehicle, which is specifically adapted to be used as a bumper car. The vehicle is constructed from a frame that allows the vehicle to absorb and deliver impacts in a more efficient manner. Additionally, the vehicle includes steering and clutch assemblies-that allow for increased maneuverability. This increased maneuverability makes for,a more pleasurable and exciting bumper car game.

Abstract: A control method of a transmission system in a human-powered vehicle based on a forecasting comfortable power consumption and a comfortable cadence is provided in this invention to supply a comfortable travel for a controller of a human-powered vehicle. This control method includes the steps of sensing a traveling distance in one past period and an inclination. Then the controller may forecast a comfortable power consumption in the virtual period and calculate a forecasting traveling distance in the virtual period from the forecasting power consumption. Afterward, controller may calculate a forecasting optimum gear ratio from the forecasting traveling distance and a comfortable cadence and may generate control signals to the transmission system in the human-powered vehicle. The transmission system in the human-powered vehicle then automatically adjust its gear ratio to the forecasting optimum gear ratio or automatically choose an existing gear ratio which is most close to the forecasting optimum gear ratio.

Abstract: Computer for a bicycle includes a speed change with a chain transmission, including a plurality of front crown wheels (16) which can be driven in rotation by a pair of pedal cranks (18) and a plurality of rear sprockets (20), a first sensor (30) for providing an electric signal indicating the speed of rotation of one wheel of the bicycle, a second sensor (32) for providing an electric signal indicating the speed of rotation of the pedal cranks (18), and a third sensor (38) for providing an electric signal indicating which is the selected front crown wheel. The computer has a display (24) for displaying riding information of the bicycle, and an electronic control programmed so as to determine the number of teeth (Zp) of the selected rear sprocket as a function of said signals and as a function of stored data indicating the number of teeth (Zc) of the front crown wheels (16).

Abstract: A rear wheel hub and chainless drive train gear assembly for use on a bicycle having an axle bracket fixed to the frame of the bicycle, a spindle extending axially through the axle bracket and left and right pedal crank arms for rotating the spindle upon application of a pedaling force. A primary drive gear fitted to the spindle drivingly engages carrier gears which operate a planet gear cage housing and a multiple planetary gear and sun gear arrangement according to various gear ratios determined by selective operation of a clutch assembly. Planetary gear groups each include an integral set of planetary gears of varying size which mesh with corresponding sun gear rings. Operation of the clutch assembly serves to selectively engage pawl stops with a corresponding sun gear ring, thereby engaging the corresponding sun gear ring with one of the planetary gears of the planetary gear groups according to a selected gear ratio.

Abstract: The invention is to provide a chainless transmission mechanism comprising a first shaft connected to a pedal of the bicycle; a first bevel gear connected to the first shaft; a second shaft perpendicular to the first shaft, two ends of which are connected to a second bevel gear and a third bevel gear, respectively, the second bevel gear being matched with the first bevel gear to drive the second shaft; a fourth bevel gear mounted on an axle of a rear-wheel hub of the bicycle to engage with the third bevel gear; a ratchet clutch connected between the rear-wheel hub and the axle; and a connection member connected between the fourth bevel gear and the rear-wheel hub. A bicycle with the chainless transmission mechanism of the invention is of a simple manufacturing process and a lower cost.

Abstract: A traveling and accelerating system for bicycles includes a frame having a front wheel at a front part and a rear wheel at a rear part thereof; a pair of pedals fixed at both sides of a shaft which is rotatably supported at a boss being fixed under a center of the frame, to be driven by a user's feet; a driving sprocket axially fixed on the shaft for transmitting rotation power via a chain to the rear wheel; a housing attached at one side of the boss to be closed with a cap and having a hollow cross-sectional shape to accommodate accessories; a pinion axially fixed on the shaft beside the driving sprocket in the housing; a first gear member accommodated in the housing and having an inner gear part along its inner diameter; a second gear member movably contacting the first gear member and provided with planetary gears to be engaged with the inner gear part of the first gear, the planetary gears being fixed by pins and rotatable in relation to the pins; a pair of latch means respectively inserted and fixed

Abstract: A motor unit is provided for operating an internal hub transmission, and a speed sensor is mounted to the motor unit for detecting a speed signal external to the motor unit. Since the speed sensor is mounted to the motor unit, the position of the speed sensor can be securely fixed on the bicycle. Also, the wire for the speed sensor may be integrated into the wiring harness for the motor, thus eliminating the requirement of a separate wire route along the bicycle.

Abstract: A shiftable bicycle transmission (30) is automatically shifted by automatically sensing output power torque of the transmission (30) automatically converting sensed output power torque to transmission shifting motion, and automatically shifting the shiftable transmission (30) with that transmission shifting motion. A shiftable bicycle (10) driving power transmission has a transmission shifting element (47, 49), a bicycle output power torque sensor (51), and an output power torque-to-transmission shifting motion converter (1, 2, 3) having an output power torque input coupled to that output power torque sensor (51) and having a transmission shifting motion output. Such transmission shifting element (47, 49) is coupled to the transmission shifting motion output of that converter.

Abstract: An anti-rollback system allows wheelchair users the freedom of travelling up and down inclines without enlisting the assistance of others to do so and includes a pair of non-rotatable axles fixed to the frame of a wheelchair, a pair of wheel hubs, each of which includes two sprags or one-way clutches mounted in opposing rotational directions therein, and a shifting mechanism for selectively engaging either or neither sprag with the associated axle. The user may thereby select normal free-wheeling operation of the wheelchair or anti-rollback in either the forward or reverse direction.

Abstract: An automatic shift control apparatus for a bicycle transmission includes a shift control mechanism for the bicycle transmission and a bicycle speed receiving mechanism for receiving a bicycle speed. The shift control mechanism commands downshifting of the bicycle transmission from a higher speed step to a lower speed step in response to the bicycle speed and commands upshifting of the bicycle transmission from the lower speed step to the higher speed step in response to the bicycle speed.

Abstract: A bicycle shift control device includes a pedaling force determining unit for determining a pedaling force exerted on a pedaling member and a shift stage determining unit which determines an optimum shift stage of a bicycle transmission from the pedaling force. In a more specific embodiment, the shift control device includes a memory that stores first and second pedaling force values for a shift stage of the bicycle transmission, wherein the second pedaling force value is greater than the first pedaling force value, and first and second traveling speed values for the shift stage of the bicycle transmission, wherein the second traveling speed value is greater than the first traveling speed value.

Abstract: The present invention is related to a compact automatic gear change device for a bicycle in which all of the sprocket wheels (1) and (2) mesh by means of an intermediate moving element (3) and are equipped with anti-reverse pawls automatically controlled by mechanical or electronic tachometers. A first device is a line gear cluster incorporated in a sealed housing and connecting the bottom bracket spindle to the wheel spindle by completely eliminating the drive chain. A second device is composed of coaxial sprocket wheels driven by three intermediate moving elements (3) positioned on the inside, whereas the starting teeth of the wheels (1) and (2), the pawls (4) and (5) and the tachometers are positioned on the outside. The assembly is housed in two sealed housings (44) and (46) that rotate over one another. This compact cylindrical device can be positioned on the wheel or on the bottom bracket with a drive chain.

Abstract: An apparatus for changing power direction for a bicycle is provided. The apparatus for changing power direction roughly including a shaft housing, a change ring, a carrier, a sun gear and a sprocket cap is located between a pedal shaft and a driving sprocket. The shaft housing supports the rotating pedal shaft and controls the carrier by using a plurality of pawls to be released from and inserted into a plurality of openings formed at the inside of a rim of a right cap of the shaft housing when pedaling rearward. The change ring releases and inserts the pawls from and into the shaft housing when pedaling rearward, and the carrier having a first ratchet and a second ratchet at the outside and inside of a left portion thereof, respectively, and a plurality of planetary gears to be rotatably set at a right portion maintains or changes the direction of power from the pedal shaft, thereby transmitting the power to a driving sprocket.

Abstract: A rotary handle gearshift actuator for operating bicycle gears. The gearshift actuator includes a rotatable housing and a stationary housing. The rotatable housing has a planar surface and including an outer cylinder extending outwardly from the planar surface, the outer cylinder having an inside wall and a recess defined axially in the inside wall. The stationary housing has a planar surface and an inner cylinder extending outwardly from the planar surface of the stationary housing. The inner cylinder has a distal end and a bayonet hook extending radially outwardly from the distal end, the bayonet hook being configured for sliding engagement with the recess of the outer cylinder of the rotatable housing.

Abstract: This wheelchair employs the use of push levers attached to drive gear sprockets, which propel the main rear wheels of the chair through bicycle chains connecting the front sprockets to gear clusters mounted on the rear wheel axles. Ratchet mechanisms allow each push lever to transmit power in either a forward or reverse direction. Derailers are mounted over the rear axles and are activated by shifter mechanisms mounted on the push levers. Calliper-type wheel brakes are mounted on the frame beside each wheel and activated by hand brake levers mounted on the push levers.

Abstract: An electronically controlled speed change device for bicycles has an automatic mode of operation in which, at the request of the cyclist for increase or decrease of the speed ratio, the system itself automatically provides to select the pair front crown wheel-rear sprocket which is most suitable to provide a progressive increase, or respectively a decrease, of the distance covered by the bicycle at each turn of the pedals.

Abstract: Described is a bicycle with a gear arrangement in which drive force is transmitted from the pedal crank spindle to the rear wheel by way of a direction-changing transmission and a multi-stage shiftable main transmission. A common shaft serves as the driven shaft of the direction-changing transmission and the drive shaft of the main transmission. The transmission housing can be arranged substantially within the rear wheel hub and project therefrom only at the side at which the drive arrangement is disposed. The transmission housing is preferably connected to the bicycle frame by means of a single-sided mounting swing arm.

Abstract: A Pedal mechanism for a bicycle or similar piece of exercise equipment is disclosed which allows one to apply a forward force to the drive wheel by simultaneously pressing down on both pedals of the bicycle. The pedals are positioned parallel to one another extending in the same direction from the pedal shaft. The pedalling motion of the invention can be performed with the pedals positioned pointing towards the front of the bicycle or with the pedals pointing towards the rear of the bicycle. The pedalling motions are referred to as a hopping or kangaroo stroke.

Abstract: The invention discloses a pedal mechanism for a bicycle or a piece of exercise equipment which allows one to impart forward motion to the drive wheel of the bicycle through an alternating or stair climbing pedalling motion. The downward force of one of the pedals causes the other pedal to move in the opposite direction. Depending on the position of the pedals, many different pedalling patterns are possible.

Abstract: A shiftable variable ratio sprocket chain drive for rider propelled vehicles, such as bicycles, and for other uses has a shifting mechanism, such as a derailleur mechanism or a gear mechanism, a shifting actuator operable by the rider or user, and a novel hydraulic connector operatively connecting the actuator and the shifting mechanism for hydraulically operating the shifting mechanism to vary the ratio of the drive in response to operation of the actuator.

Abstract: A multiple speed shaft drive for a bicycle, including: a forward disk having a plurality of concentrically disposed ring gears, wherein the forward disk is connected with the pedal crank of the bicycle; a rearward disk having a plurality of concentrically disposed ring gears, wherein the rearward disk is connected to the rear wheel hub; a forward drive shaft; a rearward drive shaft; a free wheel mechanism connecting the forward drive shaft to the rearward drive shaft; a forward pinion gear slidably mounted to the forward drive shaft; a rearward pinion gear slidably mounted to the rearward drive shaft; a forward gear shift mechanism for moving the forward pinion gear into gearing engagement with a selected ring gear of the forward disk; a rearward gear shift mechanism for moving the rearward pinion gear into gearing engagement with a selected ring gear of the rearward disk; and a clutch mechanism which automatically disengages the rearward hub from gearing engagement with the rearward pinion gear whenever a ge

Abstract: A speed change mechanism, principally for use on a bicycle, is provided in which a plurality of driving gears and an associated plurality of driven gears are coupled by a plurality of drive chains, such that each driving gear and its associated driven gear form a gear pair, with each gear pair providing a different input-to-output drive ratio. The driving gears are fixedly mounted to a driving shaft that is operatively coupled to a power input, such as a pedal and crank assembly of a bicycle, and the driven gears are rotatably disposed around a driven hub, with means provided for shifting between and engaging one of the driven gears to the driven shaft, with the driven shaft further operatively coupled to an output gear that will transmit power to a rear wheel of a bicycle, for example.

Abstract: A shiftable pedal bearing gearing for use in a pedal bearing of a type having a pedal bearing housing and a crank axle axially traversing the pedal bearing housing and carrying at least one pedal crank, for use in a bicycle or the like, includes a chainwheel mounted on the crank axle and a disk extending parallel to the chainwheel. Arranged between the chainwheel and the disk is a coupler which is rotatably mounted on the crank axle and movable in axial direction between two switching positions. The coupler, on the one hand, and the chainwheel and disk, on the other hand, have opposing sides of complementary configuration to allow interlocking or form-fitting connection at uniform surface pressure between said coupler and the chainwheel in one switching position and the disk in the other switching position.

Abstract: A recumbent bicycle including a frame having a longitudinal main tube divided into a main tube front section telescopically inserted into a main tube rear section to form an adjustable length frame. A forked yoke is pivotally fixed to the main tube front section. A front wheel is rotatably mounted on the yoke. A rear wheel is rotatably fixed to the main frame adjacent the frame rear end. A pedal assembly of a driving mechanism for driving the rear wheel is mounted on the main tube front section adjacent the frame front end. A seat and a handle assembly are mounted on the main tube rear section adjacent the frame rear end. A linkage rod operatively connects the handle assembly and the front wheel yoke. The linkage rod is preferably slidably mounted on a central member of the handle assembly allowing a user to modify the steering ratio between the rotation of the handlebar assembly and the corresponding rotation of the front wheel yoke.

Abstract: A twin gear drive assembly for a bicycle comprising a front gear assembly with a plurality of gears for driving the rear gear; for driving the frontal wheel with an associated front derailleur; an intermediate gear with a shaft coupled to the front gear for concurrent rotation; a drive gear or the frame beneath the front gear assembly with pedals for the rotation thereof with a chain retainer for the drive gear; a lower gear with a larger number of teeth located beneath the drive gear of the second assembly with an associated chain coupling the upper and lower gears of the supplemental gear assembly and pebbles secured to the lower gear of the second assembly for rotating the lower gear directly, the upper gear through the second chain and the first driven gear through the axle therebetween; first control means for controlling the derailleur of the first gear assembly and a second control assembly for controlling the chain in its position with regard to the gears of the second assembly at the discretion of th

Abstract: The derailleur cable-collet system is an automatic pedal-rate to wheel-rate adjusting system. Pedal pressure is sensed at the crankshaft hub and electronically compared to pedal-pressure threshold values entered by the rider into an electronic circuit. Pedal velocity is sensed at the front sprocket and electronically compared to velocity threshold values. Shifting decision logic is relayed to feed battery current into solenoid-driven collets that move derailleur cables. An arc-jaw collet moves derailleur cable in one direction, and employs spring-forms for structure and bias. A distribution circuit senses travel limits of derailleur arms and redirects cable travel to another derailleur chain-guiding apparatus. A pedal-position sensor contributes to a pedal shifting time circuit that minimizes chain force during sprocket-shifting actions.

Abstract: An automatic electromechanical gear changing system for automatically derailing the endless chain of a multi-speed bicycle from one rear transmission sprocket to another rear transmission sprocket to effect rear transmission gear shifting. The automatic gear changing system includes a main housing member mounted to a down tube of the bicycle, a handlebar-mounted console which displays various system parameters for the rider (type of program in use by system, speed, gear, battery level, trip miles), and a microprocessor unit disposed within the console for initiating, controlling, and terminating transmission gear shifting of the endless chain on the rear transmission sprockets.

Abstract: A hub for a bicycle can typically have an axle for being non-rotationally connected to a frame of the bicycle, a hub body rotatably mounted about the axle, and a drive element rotatably mounted on the axle. A plurality of transmission elements can preferably be disposed between the axle and the hub body for transmitting a drive force from the drive element to the hub body, and a selection between various gearing ratios provided by the transmission elements can preferably be provided by a selectively engageable ratchet mechanism and a control device for selectively engaging and disengaging the ratchet mechanisms. The ratchet mechanism can be provided by at least one pawl, biased radially inward by at least one spring, to non-rotationally couple a ring body in one direction of rotation with the axle.

Abstract: A bicycle includes a first power train to propel the bicycle forward, a second power train to propel the bicycle forward and backward, and means for setting each of the first and second power trains from withdrawn mode into operative mode or vice versa. With this arrangement, the bicycle can be used for different purposes.

Abstract: A bicycle for converting reciprocal human motion into linear vehicular translation. The inventive device includes a frame supported relative to a ground surface by front and rear wheels. A pedal assembly converts user pedaling into rotational torque output through a pedal shaft extending vertically through the frame. A first transmission receives torque from the pedal shaft and couples with a drive shaft extending through the frame. A second transmission couples the drive shaft to the rear wheel such that the vehicle can be accelerated by an individual.

Abstract: A bicycle having pivotally mounted steps on alternate sides receives a rider straddling the bicycle frame while standing upon the steps. The rider shifts weight from side to side alternately driving each of the steps downward while the other step moves upward. A belt drive is attached to each step and through a pulley arrangement rotates a pair of drive pulleys on a rear axle to engage and alternately disengage the rear axle or the rear wheel for driving in a forward direction upon each down stroke.

Abstract: A bicycle transmission, comprising a primary axis mechanically linked to bicycle pedals, an intermediate axis, and a final axis, mechanically attached to the bicycle drive wheel. Gears of different sizes are located on each axis. The intermediate axis contains gears mounted in fixed locations along the intermediate axis. The primary axis has a group of gears that are movable along the primary axis so as to vary which gears on the primary axis engage gears on the intermediate axis. The final axis also has a group of gears that are movable along the final axis, so as to vary which gears on the final axis engage gears on the intermediate axis. Gear covers engage gears on the primary axis and final axis to move them along the primary axis and final axis, so as to obtain various combinations of gears, to vary the overall gearing ratios between the pedals and the drive wheel.

Abstract: The invention is a variable mechanical transmission for converting a rotary input into a rotary output. The transmission includes a spindle for mounting, allowing for rotation in response to the rotary input, a hub mounted on the spindle for rotation therewith, and a plurality of elongate arms. The arms are each pivotally mounted on the hub, with the pivoting axes of the arms being arranged about the spindle axis. Each arm carries at its outer end a clutched pinion which rotates in one direction only. The pinions engage the teeth of a gear. The gear is mountable on a frame for rotation about a gear axis paralleling the spindle axis and also for movement on a frame between concentric and extreme eccentric positions, at which the gear axis has a minimal and maximal displacement, respectively, from the hub axis.

Abstract: A drive mechanism for a cycle vehicle is disclosed herein for selectively importing a driving force from a pedal operated front gear drive section to a rear gear driven section via a variable transmission. The drive section and the driven section include a plurality of concentric circular rows of gear teeth selectively engageable by front and rear intermediate gears positionable on linear guide rods by a variable combination of manually settable transmission gears. The drive and driven section gears constitute shift gears adapted to achieve gear speed change and provide a driving force to the rear wheel via rotating shafts.

Abstract: An improved self-propelled wagon of the type having a body including front and rear ends, a front axle pivotally mounted to the front end, a rear axle mounted to the rear end, and a propelling means for transmitting the human force of the user to the rear axle. The improvement comprises a sliding gear assembly that includes a hollow tube having proximal and distal ends, a small spur sprocket freely rotably mounted at the proximal end of the hollow tube and a large spur sprocket means freely rotably mounted at said distal end of the hollow tube. The rotation of the sprockets driving corresponding chains trained thereon and causing the rotation of the rear axle. The sliding gear assembly is adapted such that a user may adjust the sliding gear assembly to selectively intermesh with, and turn, the small spur sprocket or the large spur sprocket. The improvement also comprises a steering assembly having a tube, horizontal rod, vertical rod, a fork and rod.

Abstract: For use on a wheelchair, a wheel assembly has a change speed gear mounted in the wheel hub. A handwheel is connected to the input of the speed gear and the output of the speed gear is connected to the hub. A free wheel device can be provided between the handwheel and the speed gear. To prevent unwanted backward movement, a clutch assembly can be provided. The clutch assembly engages with a member attached to the hub and permits forward movement only. The clutch can be disengageable. The footrests of the wheelchair can be pivoted up and down by a hand lever mounted on the wheelchair and connected, as by a cable, to a lever on the footrest. A hand lever is provided on each side of the wheelchair.

Abstract: A powered control device for speed change in a bicycle comprises an electric motor directly mounted onto the rear derailleur and is provided with an encoder for detecting the position of the rear derailleur.

Abstract: A hybrid transmission provides a continuous range of reduced output speeds in a coaxial relationship about a common central axis within a surrounding cylindrical housing. The input shaft speed is increased through a planetary transmission having a sun gear fixed to a variable eccentric shaft. The eccentric shaft is surrounded by an orbiter and spaced anchor and drive vanes, which are interconnected by a plurality of anchor and drive vanes. Output speed is varied by change of the degree of eccentricity, using a worm gear drive interposed between inner and outer eccentrics within the eccentric shaft. control is achieved through shift rings that rotate a worm in response to external cable tension.