GB2410727A - Human powered vehicle or exercise machine - Google Patents

Abstract

The vehicle or machine has a footboard 60 which can be rotated and tilted by an operator on a resisting board 13, by twisting about the waist. The footboard, mounted on a ball and soket joint 81, acts to rotate an arm 20 about a vertical axis, the arm being coupled by bevel gears 50, 51 to driven wheels 21, 22 for the vehicle. The arm 20 carries one or more wheels at its outer end for contact by the footboard 60. Two footboards in tandem can be provided. For an exercising machine, the footboard is on a sliding treadmill surface; the rotary motion is transmitted to a sensor and shown on a digital screen.

Description

1 2410727

A WHEELED VEHICLE DRIVEN BY TWISTING OF WAIST

The background of the invention.

1. Field of the Invention

This invention relates to a self-propelled vehicle that can be driven by waist-twisting movement and the method thereof. It is specially suitable for the person who needs exercise to develop her (his) waist, hips and thighs with a lot of fun. One of a main field of the present invention is a method of motion transmission which converts the waist-twisting movement of human body to a rotary motion then drive the vehicle.

To estimate for the future, the present invention will be diversely developed many similar kinds of vehicle driven by waist-twisting. It is similar to the development of paddles and cranks of bicycle. Early in 1818, someone invented a bicycle. At that age, bicycle was made by a main body comprising two wheels and handlebars in front. So, people could only slide on a bicycle in 1818. Then in 1839, someone invented pairs of paddles and cranks which convert the motion of human feet to a rotary motion to drive bicycles. Therefore, a self-propelled bicycle was invented.

The bicycle was driven by a method of motion transmission which converted motion of human feet into a circular motion then caused bicycles forward. Soon, the diversities of bicycle were invented --- unicycle, tricycle and the five-wheeled bicycle, and then a stationery bicycle (exercycle). As to the number of rider thereof, the original bicycle evolved a tandem bicycle, and a bicycle for three persons' riding Same story happened to the kick scooters. Originally, people can only stand on kick scooters to slide. Because of the disclosure of present invention, people then can propel the scooter-liked vehicle by the movement of their waist-twisting.

2. Description of the Related Arts

Several of the prior arts devices have the same function as the present invention. A previous device of waist-twisting exercise for ladies (gentlemen) is shown in FIG. 5. Its main body looks like two overlapped Frisbees. To describe it precisely, the two overlapped plastic discoid boards share one axle inside of and between both of their centers. And several metal balls are embraced between the two discoid boards, and they enable the upper discoid board rotates freely when user twist her (his) waist on this device. As the shown FIG. 2, FIG. 3, FIG. 4 and FIG. 6, the conventional waist-twisting vehicles are driven by the strength from the player's waist-twisting and arm-swinging movement. In other words, the user's arm muscles plus waist muscles make these conventional vehicles move. The moving track of their two front wheels is like a letter "S". User grips the handlebars and swings it by two arms, then this movement causes the vehicle move forward. Please see the FIG. 7, (prior art D) the reason why these kinds of vehicle are made to move is because the distance of their two front wheels (d) are always shorter than the distance of the two stable rear wheels'. (D) A user twists his waist with his two hands gripping the handlebars and swings his two arms to cause the vehicle to move by the strength of waist through the rider's arm muscles. This is the method of motion transmission of the prior art.

Obviously, it is different to the method of present invention's method.

Explaining the problem the invention solves The problem that the invention is to solve is to create a more beautiful waist- twisting posture than the prior arts do and bring an entertainment that prior arts never do. By this way of the present invention, waist-twisting exercise becomes a popular outdoor sport. Besides, people can have a lot of fun when they are doing or watching this exercise in a group or in a specially designed game. The prior art of waist-twisting exercisers make the users horizontally twist their waists. Frankly, it's not a beautiful and charming posture. So, ladies do the waist-twisting exercise only inside of their house with the prior art shown in FIG. 5. These conventional waist- twisting exercisers really bring a boring homework to the users. And, it wasts time. That doing exercise is a kind of homework is an old concept. Nowadays, people like to have much more fun. But most of the modernized people have limited time to do exercise and have a few times to have entertainment. The present invention combines entertainment and exercise together.

Therefore, players can have well-proportioned figure in a short term and have lots of fun instantly when doing this exercise.

Beside the vehicle, the new-invented brake kits is specially for small wheel. In the prior arts, kick scooter always have the brakes operated by foot palm. It is impossible to use a foot operated brake in this invention. A hand-griped calliper brake of prior art does not suit for small wheel.

In the invention, a new-designed flat brake kits is disclosed. So, the invention also solve the problem of instoring a hand-griped brake operated by cable wire in small wheel.

What the invention does The object of the present invention is to provide a wheeled vehicle propelled by waist-twisting, then the users can have a beautiful posture of Hawaiian hula style. In this way, users can save much of time by combining exercise and entertainment together and have a well-proportioned figure in a short term.

The essential features of the invention Accordingly, in one form of the invention, the scooter-liked vehicle driven by twisting of human waist comprises: a main body frame with five wheels; a shaft with a ball-shaped top end coupler, and with its bottom end welded on mid of said main body frame; a round footboard with a receiving coupler in centre thereof coupling to said ball-shaped top end coupler; a resisting board located under said footboard, with at least a ring-shaped plane surface; a driver unit, including at least one rotatable wheel and corresponding axle therein, and at least one supporting body to support said axle; said driver unit located between a space of said footboard and said resisting board, and with at least one rotatable wheel withstanding said footboard, so that said footboard is able to press said driver unit sideways then push said driver unit to move; a rotation arm with a first end coupled to said shaft by rotary coupler, with a second end joined to said driver unit; at least one mechanism of motion transmission, in which at least one element driven by said rotation arm or said driver unit, to drive said driven wheels, said mechanism is a pair of bevel gears or worm and gears.

The method to operate the vehicle is to stand on said footboard and twist waist, and then tilt heels and toes to force each point of circumference edge of said footboard to ground on said resisting board in turn, and meanwhile, said footboard presses said driver unit sideways in a same direction, therefore said driver unit moves tangentially toward the highest point on the circumference of said footboard; said driver unit therefore drives said rotation arm to produce rotary motion. The rotary motion of said rotation arm is transmitted to the two driven wheels by said mechanism, such as a pair of bevel gears or warm and gear. In this way, waist-twisting strength causes the vehicle to run.

Some important fitures of the invention Preferably, businessmen and manufacturer will choose to adopt the bicycle spare parts, such as the bicycle's free wheel, the chain and the hub of children's bicycle to assemble this invention.

Not only the adoptions from bicycle spare parts, the front wheel assembly of this invention is also an adoption of a kick scooter's front wheel and handlebares. The driven wheels are PU wheels from kick scooter also. The body shell of this invention can be an aluminium tyre rim of a bicycle. The band and pulley can be adoptions form mortor scooter's spare parts.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

A preferred embodiment of the invention will now be described with reference to the accompanying drawing in which: FIG.lis a perspective view of the present invention. This is the embodiment A.

FIG.2is a perspective view of prior art A.

FTG.3is a plane view of prior art A

FIG.4is a perspective view of prior art B.

FIG.5is a perspective view of prior art C

FIG.6is a perspective view of prior art D.

FIG.7is a bottom view of the prior art D.

FIG.8is a perspective view of another proposal of the "driver unit". It can replaces the element 77 in FIG. 11 or the element 977 in FIG. 16.

FIG.9is a perspective view of the "driver unit" with three rotatable wheels.

It can be configured in the embodiment A in FIG. 1 or the embodiment B in FIG. 13 to replace the driver unit.

FIG.10is a cross sectional view of another proposal embodiment (The shaft D80, the driven wheels D21,D22 and horizontal axle D701 are not cross sectional.) For another porposal, it shows that the driver unit D70 and rotation arm D20 can be located on the edge portion of a flywheel D15.

FIG.llis an exploded view of the embodiment A in FIG 1.

FIG.12is a perspective view of the other proposal of the "driver unit". The screw hole F20 1 is to be fastened to a flywheel or a rotation arm.

FIG.13is a perspective view of the embodiment B. FIG.14is an exploded view of the flat brake kits of embodiment B in FIG l 3.

FIG.15is a perspective view of a friction body 999 glued onto an elastic body 998.

FIG.16is an exploded view of the embodiment B in FIG 13.

FIG.17is a cross sectional view of the embodiment B in FIG 13.( view II toII) FIG. 18 is a perspective view of the present invention in tandem design. The construction under each single footbaord is the same as the embodiment A in FIG. 11 (except the castor trailing wheels 23,24).

FIG. 19 is a cross sectional view of the main body of the embodiment A in FIG. 11 of the line I- I.(The shaft 80, the driven wheels 21,22 and horizontal axle 70 are not cross sectional.) FIG. 20 is another proposal of the embodiment A.(Cross sctional view, but the shaft A80, the driven wheels A21,A22 and horizontal axle A701 are not cross sectional.) It shows that the driver unit A70 may have a multiple of rotatable wheels A74, A75. And said driver unit A70 and rotation arm A20 can be located on an edge portion of a flywheel A15.

FIG. 21 is another proposal of the embodiment A..(Cross sctional view, but the shaft B80, the driven wheels B211,B221 and horizontal axle B709 are not cross sectional.) It shows that two free wheels B212, B222 located in the centres of the two driven wheels B211, B221 respectively.

The first end B201 of the rotation arm B20 is joined to an edge portion of a flywheel B 15. The driver unit B70 includes two supporting bodies B701, B702 supporting the rotatable wheel B74.

FIG. 22 is a perspective view of the present invention G1 a method of motion transmission being adopted by the prior art G2 stationary exerciser.

Detailed description

The present invention refers to three categories: one is the method of converting the human waist-twisting movement to a circular motion, the other is the structure of a vehicle which adopts this method; another is the structure of a flat brake kits specially for the narrow space between small wheel and supporting body thereof. The structure of the flat brake kits can be assembled much more fast than the proir arts did.

Embodiment A One preferred embodiment A is shown in FIG. 1. And its exploded view is shown in FIG. 11. A main body frame 10 is covered by a resisting board 13 above, and surrounded by a drum-shaped shell 11. The two castor trailing wheels 23,24 are assembled to the drum-shaped shell. l l The forward most 14 of said resisting board 13 engages a detachable steering device 30 --- a steering wheel 25, a handlebar 31 and a handlebar stem 32 extending through a steering column 33 which is incorporated with the forward most 14 of drum-shaped shell 11 with screws 34 and nuts 35.

The handlebar 31 is mounted by a brake lever 41 with cable 42 linking to brake shoes 43 - all the brake kits 40 are the same as bicycles'.

A shaft 80 vertically extends through a hole 12 in the middle of said resisting board 13 and extends through a square centre bore 16 of a fly wheel 15. The upper end 81 of said shaft 80 is a ball-shaped top end 81. Please also see FIG. 19. The ball-shaped top end 81 joins to the centre 61 of said footboard 60 with four blocks of bushing 63,64,65,66 which are secured by a hole 62 caved in the centre 61 of the footboard 60 with two round plates 67,68 fixed by screws and nuts.

The first end 201 of a rotation arm 20 joins to a free wheel 95 by a screw 93 and tenon joint. 92 (Also shown in FIG. 11, This free wheel 95 is like the one configured in the rear hub of a bicycle.

The only difference is that, instead of chain teeth, it has only one tenon 94 welded on its body 95.) Inner ring 96 of the free wheel 95 secures the upper end 501 of the hollow bevel gear 50 by a threaded ring 99. Please refer FIG. l 9, centre bore 502 of said hollow bevel gear 50 is coupled to said shaft 80 by ball bearing 505 and ball bearing 506. Said rotation arm 20 inclines and extends over the resisting board 13 with a second end 202 coupled to a rotatable wheel 74 with a ball bearing 75. In other words, the second end 202 of the rotation arm 20 tapers and becomes a rotatable wheel's axle 202. This rotation arm 20 enables the rotatable wheel 74 to keep in a high position 622 on the circumference edge of said footboard 60. Therefore, when an operator stands on the footboard 60 to twist waist and tilt his heels and toes, the wheel roller 74 is pressed sideways by the footboard 60 then move circularly.

A bevel gear 50 embraces ball bearings 505 and 506 in its centre bore 502 being rotatably coupled to the shaft 80. Please refer FIG. 11, the mid portion of bevel gear 50 is secured by the square-shaped centre bore 16 of a discoid metal plate 15 which acts as a flywheel 15. By this arrangement of flywheel 15, the circular motion transmitted from the rotation arm 20 can be stabilized and balanced.

Under the resisting board 13, the bevel gear 50 engages with bevel gear 51 (also shown in FIG. 19). Bottom end of the shaft 80 is firmly welded on a supporting bridge body 84. ( shown in FIG. 11, 19) Thereby, the vertical shaft 80 can afford a space for the horizontal axle 70 to extend across underneath. And centre bore 513 of the bevel gear 51 secures a horizontal axle 70 firmly with a tenon joint 511. The horizontal axle 70 extends and crosses the main body frame 10 and the drum-shaped body shell l l with ball bearings 701,702,703,704. Centre bore of the two driven wheels 21,22 are secured firmly to the two axle ends 700,705 respectively.

When operator stands on this vehicle with his two hands gripping the handlebars 31, and twisting his waist, and then tilts heels and toes to force each point of circumference of the footboard 60 to ground on the resisting board 13 in turn. Meanwhile, said footboard 60 pressies said driver unit 77 sideways in a same direction. Therefore said driver unit 77 moves tangentially toward the highest point on the circumference of said footboard 60 then drives said rotation arm 20 to produce a circular motion around said shaft 80. The circular motion of rotation arm 20 is transmitted to the two driven wheels 21,22 by the bevel gear 50 and the bevel gear 51 through the horizontal axle 70. In this way, operator's waist-twisting movement causes the vehicle to move forward.

It is very essential and critical to the function of footboard centre 61: The centre point 81 Of the ball-shaped head 81 of shaft 80 (shown in FIG. 19) should be always arranged on the level 150P.

It is the lower surface 622 of footboard 60. (This is a plane surface for rotatable wheel 74 to touch and roll under it 60.) Only in this arrangement, the centre point 6 l of footboard 60 will be a centre of tilting and grounding. (When operator tilts his heels and toes on footboard 60, the circumference edge of said footboard 60 on its lower surface 150P will tilt and ground on resisting board 13.) Another critical essential is: (please see the FIG.9) In case the driver unit 170 engages with the resisting board by two or multiple of rotatable wheels, the straight tracks l 75T, l 76T of each single rotatable wheel 175,176 should be arranged tangently to the circle track 60T (FIG 11) on the resisting board 13 respectively. (The circle track 60T is shown in FIG. 11. The rotatable wheel l 74 <also see FIG. 9>, which withstand and touch to the footboard 60, moves circularly and this motion projects a circle track 60T on resisting boardl3. It is the circle track 60T.) In this way, the driver unit 170 will move and rotate around a centre (such as a shaft) efficiently when operator plays the vehicle I (shown in FIG. l). If the rotatable wheels 175T,176T are not respectively arranged in different tangent line, the driver unit 170 will be stuck and unable to move well on resisting board. (Same condition to the driver unit F 170 in FIG. l 2, the straight tracks l 75t,176t should be respectively arranged tangently to the circle track on resisting board.) Because the transmission mechamism of the vehicle I is facilitated a free wheel 95, the rotation arm 20 can only drive the vehicle I in one rotary direction. If operator twists his waist and causes the rotation arm 20 move reversly, it will rotate in neutral only. In other words, if bevel gear 51 of the vehicle I runs faster than the rotation of bevel gear 50, the rotation arm 20 will not be driven reversely by driven wheels 21,22 and the bevel gear 51. This function enables the operator optionally not to twist his waist to drive the vehicle 1. Operator may choose to coast this vehicle I with his one foot propelling on the ground another standing on the footboard 60.

Because there is a free wheeler unit (some occasions, a ratchet to substitute) facilitated in a set of mechanisms to transmit rotary motion, a player's waist-swiveling direction can be clockwise or anti-clockwise. A "free wheeler" includes kinds of ratchet, kinds of free wheel system. As long as the unit has the function of transmitting only one directional driven strength and neutralizing reversed drive, it is named free wheeler or free wheel system.

The pair of bevel gears 50, 51 can be substituted by any mechanism which transmits and converts a rotary motion surrounding X-axis to Y-axis (to transmit a rotary motion surrounding a vertical axle to a rotary motion surrounding a horizontal axle), such as worm and gear.

Two footboards for two operators can be made in one vehicle --- a tandem design (show in FIG. 18). This vehicle S1 has two drum-shaped main body Fl l,Rl l linking together -- one in front, the other in rear. Construction of the two main bodies Fl l,R11 are complete the same as the vehicle 1 in FIG. 11, except the resisting board S12 is different and there is no castor trailing wheels 23,24. The two drum-shaped main bodies Fl l,R11 share one resisting board S12.

Both of two operators twist their waists separately and freely, one in front, the other in rear. The operator in rear may put hands on the front operator's shoulder. Then the tandem vehicle is driven forward by the two operators' waist strength. By this invention, waist-twisting exercise becomes an entertainment among men and women, boyfriends and girlfriends in a designed game.

The prior art exerciser such as a treadmills (FIG. 22) or the exercisers of electrical game can adopt the present invention. FIG. 22 shows the present invention wait-twisting device G 1 slidingly configured on a treadmills G2. Because the treadmills G2 has a sliding function, users can pull and push the waist-twisting device G1 to choose the functions thereof. The rotary motion caused by the waist-twisting device G1 is transmitted to a sensor G4 and shown by a digital screen G3. Therefore, the operator's waist-twisting strength is shown. It may cause an entertainment effect by grading the operators' waist strength or by sounds effect controled by the sensor G4.

Embodiment B The embodiment B is a structure mostly assembled by standardized spare parts. It is more progressive than the embodiment A because it costs down the spare parts' sourcing and speeds up the assembling line when manufacturer try to make it, especially the assembly of the front brake kits.

The embodiment B comprises a flat brake kits (FIG 14) specially for the small wheels. The flat brake kits is controled by hand grip 923 (FIG. 13), through cable 995 (FIG. 14) and tube 981. A friction body 999 is glued on a elastic body 998. Said elastic body 998 is fastened to a first side 801 of said fork body 800 by two fastener 996,997 (also FIG 15). The second side 802 of said fork body 800 facilitates a gap 803 and welded a cut screw nut 899 thereon. In this way, after the cable is stretched through the tube 991, the tube end 990 can be nested in the cut screw nut 899.

When assembling the flat brake kits (FIG 14), the end body 992 is nested in the curve portion 989 of said elastic body 998 by the worker quickly. The cable 995 stretches through the gap 888 of the curve portion 989 of the elestic body 998, then through the gap 803 located on the second side 802 of said fork body 800. The cable 995 and the spring 993 are fixed by a fastening screw 994 which is to fasten to the cut nut 899 by its teeth thread 889. Usually, in the prior arts, to assemble the cable brake kits takes much time. Workers has to stretch the cable through tube and all the hole of the prior art kits. But to assemble this flat brake kits saves much time.

When the operator grips the level 923 (FIG. 13) of the brake, the elastic body 998 (FIG.14) bend and the friction body 999 press onto surface of the front wheel 325. The flat brake kits are suitable for any wheel with fork-shaped supporting body which has little space between wheel and its supporting body.

The embodiment B has an aluminium body shell 311 (FIG. 16, some times adopt it from bicycle rim or mortocycle rim) joined to a square tube 310 (FIG.16) having two end fastened by screws respectively. Also see FIG. 17, the square tube 310 is welded to a first shaft 380, and is rotatably coupled to a second shaft 390 whic is secured by a rear pulley 391. The front pulley 393 is rotatably coupled to the first shaft 380 and it transmit a rotary motion to the rear pulley 391 through the band 392 (the band 392 and the pulley 391 are adoptions from the mortor scooter's spare parts). Bottom end of the rear pulley 390 is secured by a bevel gear 350 to engage with a bevel gear 351 to transmit a rotary motion to the driven wheel 921, 922 by securing a horizontal axle 370 respectively.

The centre of the footboard 360 is configured a round plate 367 which is welded a ball-and socket joint 382 on centre thereof. The centre bore of the ball-and-socket joint 382 is pluged by a top end of the first shaft 380 and is fixed by a screw 385. When an operator stands on the footboard 360 and tilts his feet palms, the footboard 360 will press the driver unit 977 sideways then cause a rotary motion around the first shaft 380. The rotary motion then is transmitted to a disk flywheel 315.

The disk flywheel 315 is rotatably coupled to the first shaft 380 and joined to the front pulley 393 by screws. Therefore, when a rotary motion is transmitted to the front pulley 393, the rear pulley 391 will drive the pair of bevel gears 350,351 then drive the driven wheels 921,922 to roll and cause the vehicle move forward. (The other constructions that are not mentioned here are substantially the same as the embodiment A.) The constructions in the main body of embodiment B are substaintially the same as the embodiment A. The cover body 313 covers on the top of said aluminium body shell 311 and is fastened by screws. Said cover body 313 is not necessary to the function of the whole vehicle (FIG 13). If the aluminium body shell 311 has at least a ring-shaped plane surface 312 on its top end. Then the ring-shaped plane surface 312 serves to withstand an circumference edge 369 of the tilting footboard 360, the cover body 313 is omissible.

The handlebars stem 932 and the aluminium body shell 311 are joined by a head tube 933 welded to a hole 93S of a head tube column 934. The head tube column 933 is joined to the aluminium body sheer 311 by fasteners. (or by welding, if the head tube column 933 is made of aluminium material. ) It will be appreciated that the invention broadly consists in the parts, elements and features described in this specification, and is deemed to include any equivalents known in the art which, is substituted for the described integers, would not materially alter the substance of the invention.

Claims (1)

1. CLAI MS

   1: A self-propelled vehicle driven by an operator's waist-twisting movement, comprising: a main frame supported by at least three wheels, in which at least one wheel steered by a handlebar and at least two driven wheels driven by a rotary motion, the main frame including a shaft with a bottom end joined to the main frame, a footboard centrally coupled to the shaft, and a resisting board under the footboard, a driver unit including at least one rotatable wheel rotatably supported by at least one supporting body, and is located between the footboard and the resisting board, a rotation arm with a first end rotatably coupled to the shaft, with a second end joined to the driver unit, and, motion transmission mechanisms driven by the rotary motion caused by a side press ol the footboard on the driver unit, the rotary motion being leaded by the rotation arm then transferred to a pair of bevel gears then a horizontal axle then the two driven wheels.

   2: The self-propelled vehicle according to claim 1, further comprises a free wheel located between the horizontal axle and one of the pair of bevel gears.

   3: The self-propelled vehicle according to claim 1, in which the motion transmission mechanisms further including a flywheel rotatably coupled to the shaft, the flywheel joined to the first end of the rotation arm and rotating around the shaft together.

   4: A self-propelled vehicle driven by an operator's waist-twisting movement, comprising: a main frame supported by at least three wheels, in which at least one wheel steered by a handlebar and at least two driven wheels driven by a rotary motion, the main frame including a shaft with a bottom end joined to the main framer a footboard centrally coupled to the shaft, and a resisting board under the footboard, a driver unit including at least one rotatable wheel rotatably supported by at least one supporting body, and is located between the footboard and the resisting board, a flywheel rotatably coupled to the shaft, an outer edge portion of the flywhee! joined to the driver unit, and, motion transmission mechanisms driven by the rotary motion caused by the driver unit and the flywheel, the rotary motion being transferred to a pair of bevel gears then a horizontal axle then the two driven wheels.

   5: The self-propelled vehicle according to claim 4, further comprising a free wheel located between the horizontal axle and one of the pair of bevel gears.

   6: The self-propelled vehicle according to claim 4, in which the flywheel joined to the driver unit, the driver unit including a rotatable wheel supported by one supporting body.

   7: A method of motion transmission to convert an operator's waisttwisting movement to a rotary motion, the method comprising, a first step: providing an apparatus, the apparatus comprising: a main frame including a shaft with a bottom end joined to the main frame, a handlebar joined to the outer edge portion of the main frame, a footboard centrally coupled to the shaft, a resisting board under the footboard, a driver unit with at least one rotatable wheel, and is located between the footboard and the resisting board, a rotation arm with a first end rotatably coupled to the shaft, with a second end joined to the driver unit, and, motion transmission mechanism including a pair of bevel gears, one of said pair of bevel gears joined to the said first end of the rotation arm and driven by the rotary motion caused by the driver unit, a second step: the operator standing on the footboard, gripping the handlebar, and applying the waist-twisting movement to tilt his toes and heels to force a circumference portion of the footboard to tilt and rock to press the resisting board in a same rotary direction, so that the footboard forcing the driver unit to move around the shaft and drive the motion transmission mechanism.

   8: A method of motion transmission to convert an operator's waisttwisting movement to a rotary motion, the method comprising, a first step: providing an apparatus, the apparatus comprising a main frame including a shaft with a bottom end joined to the main frame, a handlebar joined to the outer edge portion of the main frame, a footboard centrally coupled to the shaft, a resisting board under the footboard, a driver unit with at least one rotatable wheel, and is located between the footboard and the resisting board, a flywheel rotatably coupled to the shaft, an outer edge portion of the flywheel joined to the driver unit, and, motion transmission mechanism including a pair of bevel gears, one of the pair of bevel gears joined to the centre portion of the flywheel rotating together and driven by the rotary motion caused by the driver unit, a second step: the operator standing on the footboard, gripping the handlebar, and applying the waist-twisting movement to tilt his toes and heels to force a circumference portion of the footboard to tilt and rock to press the resisting board in a same rotary direction, so that the footboard forcing the driver unit to move around the shaft and drive the motion transmission mechanism.

   9: A self-propelled vehicle driven by an operator's waist-twisting movement substantially as herein described above and illustrated in the accompanying drawings