FIELD OF THE INVENTION

The present invention relates to the field of bicycles, which is classified as B62M in international patent classifications, in particular to a cardan joint steering titanium alloy hand and foot cooperatively operated bicycle capable of being ridden with one leg.

BACKGROUND OF THE INVENTION

Most of the existing ordinary bicycles rely on alternating pedaling of the two legs to achieve movement. Alternating pedaling of left and right feet also causes transient force imbalance. The two hands can only be used for controlling the direction, braking and assisting in keeping body balance. The two hands cannot help the legs at all, and the one-leg disabled cannot be competent at riding. Even for sound people, once one leg or foot is injured, they cannot ride a bicycle. In our daily life, the driving devices of bicycles are all of rotary pedaling type. The mechanism of alternating pedaling of two feet is like a crank and connecting rod mechanism, which produces upper and lower dead points. Therefore, work cannot be done continuously, and there are the disadvantages such as of low efficiency. When the positions of a pedal rod and a chain wheel middle shaft are perpendicular to the ground, the left and right feet cannot produce driving force when pedaling downwards. Only when the positions of the pedal rod and the chain wheel middle shaft are in a horizontal relationship, no idle work will be done. For this reason, someone has designed a buckle type bicycle pedal to make the feed of a rider cling to the pedals at any position of the circumference, for example, in the granted patent No. 201020300738.7; one disadvantage of the buckle type bicycle pedal is that it is difficult to separate the rider and the bicycle in case of an accident. Moreover, only when the feed of the rider are at the downwards pedaling position of the circumference, can it produce the greatest effect on the pedals. In addition to the downwards pedaling position, the feed of the rider can hardly exert force on the pedals. Some people design the round chain wheels as elliptical ones, for example, in the patent No. 201280041248.1, titled Asymmetric Elliptical Chain Wheel for Bicycle, all of which are efforts to improve the speed of the bicycle. In order to allow the two hands to assist the two feet, some people use the hand-held mechanism for the disabled on bicycles, for example, in a hand-foot compound bicycle with double ratchets disclosed in U.S. Pat. No. 9,056,653 B2. However, the hand-held mechanism brings about left and right instability, and still fails to solve the inherent defect that upper and lower dead points are inevitably produced on rotary pedaling type bicycles. The 100-year history of bicycles at home and abroad has proved two points: one is that low-carbon environment-friendly bicycles will never be eliminated; the other is that low-carbon environment-friendly bicycles may definitely be improved creatively. What kind of mechanism is used to control the steering effectively while the two hands assist in applying force is the technical bottleneck of two-hand assisted bicycles.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a cardan joint steering titanium alloy hand and foot cooperatively operated bicycle capable of being ridden with one leg, which, by creatively improving the driving force structure, ingeniously coordinating the hands and feet to apply force to continuously drive the circumference of the chain wheel, and adopting a cardan joint steering combined assisting sliding sleeve mechanism, solves the problem pointed out in the background, so as to realize high riding speed.

A cardan joint steering titanium alloy hand and foot cooperatively operated bicycle capable of being ridden with one leg comprises a bicycle front wheel, a front wheel fork frame, a bicycle rear wheel, a frame body, a seat cushion assembly, a steering handlebar, a single dual chain wheel and a rear wheel fork frame, a frame front fork hole and a frame middle shaft hole are provided in the frame body, and a frame middle shaft is rotatably fixed in the frame middle shaft hole. As an improvement,

the upper end of the front fork rotating shaft and the lower end of the assisting stem are connected through a cardan joint component, a single dual ratchet wheel is provided on at least one side of the bicycle rear wheel, the single dual chain wheel is fixed to at least one side of the frame middle shaft, pedal shaft pins are symmetrically provided on the outer sides of the single dual chain wheel, and the single dual chain wheel and the single dual ratchet wheel are connected through a single dual chain; the lower end of the assisting stem is fixedly connected with a cardan joint upper joint, the upper end of the front fork rotating shaft is fixedly connected with a cardan joint lower joint, and a cardan joint square block is movably fixed between the cardan joint lower joint and the cardan joint upper joint;

a swinging rod through slot and an assisting support hole seat are provided on a frame upper beam, a swinging rod middle seat hole, a swinging rod upper hole ring and a swinging rod lower fork are provided on an assisting swinging rod, and swinging rod lower seat holes are provided in the swinging rod lower fork; the swinging rod upper hole ring penetrates through the swinging rod through slot, and a swinging rod shaft pin penetrates through the swinging rod middle seat hole and fixes the swinging rod middle seat hole on the assisting support hole seat; a sliding sleeve through hole and a pair of sliding sleeve swinging seats are provided on an assisting sliding sleeve, a sliding sleeve pin hole is provided in each sliding sleeve swinging seat, the sliding sleeve pin hole and the swinging rod upper hole ring are hinged by a sliding sleeve shaft pin, and the sliding sleeve through hole and the assisting stem are in sliding fit; the front and rear ends of the assisting connecting rod are respectively provided with connecting rod assisting holes and connecting rod pedal holes, the swinging rod lower seat holes and the connecting rod assisting holes are hinged by a hand drive shaft pin, and the connecting rod pedal holes and the pedal shaft pins are in rotatable fit;

a rear column seat hole is provided in the upper end of a frame rear column, pull rod lower fork holes and a pull rod upper seat hole are respectively provided in the upper and lower ends of a pull rod swinging fork, a seat sliding rail, sliding rail pin holes and a seat swinging fork are provided on a seat transverse swinging rod, and seat fork pin holes are provided in the seat swinging fork; the rear column seat hole and the seat rod pin hole are hinged by a seat shaft pin; the seat fork pin holes and the pull rod upper seat hole are hinged by a pull rod shaft pin, and the pull rod lower fork holes and the pedal shaft pins are in rotatable fit;

the seat cushion assembly is adjustably fixed at the rear end of the seat transverse swinging rod.

As a further improvement, the seat cushion assembly further comprises a seat sliding groove, sliding groove pin holes and a gravity seat, a seat backrest is provided at the rear end of the gravity seat, and the included angle between the gravity seat and the seat backrest is an obtuse angle of 115-135 degrees; the seat sliding groove and the seat sliding rail are in sliding fit, the sliding groove pin holes and the sliding rail pin holes are selectively aligned, and the sliding groove pin holes and the sliding rail pin holes are fixedly connected through groove-rail shaft pins.

As a further improvement, the front wheel fork frame comprises a front fork hole seat and a front fork rotating shaft, a front brake handle and a rear brake handle are respectively fixed on the two sides of the steering handlebar, and an assisting stem is provided at the lower end of the steering handlebar; the front brake handle is connected to a front brake through a front brake flexible wire, and the front brake is fixed on the front wheel fork frame; the rear brake handle is connected to a rear brake through a rear brake flexible wire, and the rear brake is fixed on the rear wheel fork frame.

As a further improvement, the cardan joint component consists of the cardan joint upper joint, the cardan join lower joint and the cardan joint square block, a transverse shaft pin and a longitudinal shaft pin are provided on the cardan joint square block, a joint upper pin fixes the cardan joint upper joint at the lower end of the assisting stem, a joint upper fork mouth is provided on the cardan joint upper joint, a joint upper pin hole is provided in the joint upper fork mouth, and the joint upper pin hole and the transverse shaft pin are rotatably fixed; a joint lower pin fixes the cardan joint lower joint at the upper end of the front fork rotating shaft, a joint lower fork mouth is provided on the cardan joint lower joint, a joint lower pin hole is provided in the joint lower fork mouth, and the joint lower pin hole and the longitudinal shaft pin are rotatably fixed.

As a further improvement, middle shaft clamping grooves are symmetrically provided in the two sides of the frame middle shaft, middle shaft square columns are provided on the outer sides of the middle shaft clamping grooves, middle shaft studs are provided at the outer ends of the middle shaft square columns on the two sides, and a shaft inner clamping ring is located in the middle shaft clamping grooves and used for restricting axial displacement between the frame middle shaft hole and the frame middle shaft; chain wheel center square holes and chain wheel pedal shaft square holes are provided in the single dual chain wheel, the pedal shaft pins are fixedly fit on the chain wheel pedal shaft square holes; the chain wheel center square holes are fit with the middle shaft square column, middle shaft nuts and the middle shaft studs are in tight fit, and the middle shaft nuts block the single dual chain wheel;

a pedal shaft shoulder is provided on each pedal shaft pin, a pedal fixing screw hole is provided in the outer side end surface of the pedal shaft shoulder, and a pedal fixing screw is fit on the pedal fixing screw hole; the pedal fixing screw and the pedal fixing screw hole are in tight fit to fix the pedal on the pedal shaft pin; a pedal crankshaft surface, a pedal square shaft section and a pedal shaft stud are sequentially provided on the inner side of the pedal shaft shoulder; a connecting rod pedal hole bush is provided on the connecting rod pedal hole, and the inner hole of the connecting rod pedal hole bush and the outer circle of the pedal crankshaft surface are in rotatable sliding fit; a pull rod fork hole bush is provided on the pull rod lower fork hole, and the inner hole of the pull rod fork hole bush and the outer circle of the pedal crankshaft surface are in rotatable sliding fit; an isolating slip ring is located between the connecting rod pedal hole bush and the pull rod fork hole bush and is used to eliminate end face interference; a square hole retaining ring is provided between the step of the pedal crankshaft surface and the single dual chain wheel and is used to reduce end face friction; the chain wheel pedal shaft square holes sleeve the pedal square shaft section, a pedal nut is fit on the pedal shaft stud, and the pedal nut and the pedal shaft stud are in tight fit to fix the single dual chain wheel on the pedal square shaft section.

As a further improvement, a layer of titanium alloy hard material with a thickness of 0.37-0.39 mm is provided on the outer circle of the pedal crankshaft surface, and the titanium alloy hard material consists of the following elements in percentage by weight: 8.4-8.6% of titanium, 7.1-7.3% of copper, 6.4-6.6% of nickel, 5.1-5.3% of molybdenum, 3.7-3.9% of tungsten, 2.4-2.6% of chromium, 0.64-0.66% of carbon, 0.7-0.9% of zinc, 0.1-0.3% of aluminum, and balance of Fe and unavoidable impurities; the impurities comprise the following components in percentage by weight: less than 0.08% of manganese, less than 0.005% of silicon, less than 0.06% of sulfur and less than 0.04% of phosphorus, and the Rockwell superficial hardness number of the titanium alloy hard material is HRC64-66;

the isolating slip ring and the square hole retaining ring are both made of a copper-based powder metallurgy self-lubricating wear-resistant material, which consists of the following components in percentage by mass: 2.7-2.9% of nickel, 2.4-2.6% of graphite, 2.1-2.3% of molybdenum disulfide and balance of copper; the particle size of nickel is 140-160 meshes, the particle size of graphite is 70-80 meshes, molybdenum disulfide is colloidal powder with purity of 96%-98%, and the particle size of copper is 140-160 meshes; and the pressing pressure of the blanks of the isolating slip ring and the square hole retaining ring is 260-280 MPa.

The present invention has the following beneficial effects:

(I) Since the cardan joint component is provided between the upper end of the front fork rotating shaft and the lower end of the assisting stem, in combination with the sliding fit between the sliding sleeve through hole in the assisting sliding sleeve and the assisting stem, the assisting swinging rod and the swinging rod lower fork can be driven to rotate clockwise or anticlockwise with the swinging rod shaft pin as a fulcrum, the assisting connecting rod drives the pedal shaft pin and the single dual chain wheel to rotate with the frame middle shaft as a fulcrum, a creative role is played at the “high position dead point” and “low position dead point” of the conventional bicycles and a creative role is played at the “high position dead point” and “low position dead point” of the conventional bicycles; by providing the cardan joint component, the rider can use two hands to hold the steering handlebar to push forwards or pull backwards, and it will not obstruct the front wheel from turning left or right at any time; in particular, by acting on the seat cushion assembly through the dead weight through the body gravity, the seat transverse swinging rod and the seat cushion assembly can rotate anticlockwise with the seat shaft pin as a fulcrum, the pull rod swinging fork is driven to be “lifted up”, and the pedal shaft pin and the single dual chain wheel can rotate anticlockwise with the frame middle shaft as a fulcrum; in the present invention, by additionally providing the cardan joint component, the assisting sliding sleeve, the assisting swinging rod and the assisting connecting rod, the effect that the two hands participate in doing work is realized; and in the present invention, by additionally providing the seat transverse swinging rod and the pull rod swinging fork, the limit that the positions of the two pedals of the conventional bicycle must have a difference of 180 degrees is overcome, it does need the two feet to apply force alternately and it can be ridden by one leg.

(II) Since the seat transverse swinging rod rotates clockwise or anticlockwise with the seat shaft pin as a fulcrum, and the pull rod swinging fork pulls the pedal shaft pin and the single dual chain wheel to rotate upwards with the frame middle shaft as a fulcrum, in combination with the gravity of the rider which acts on the pedal shaft pin through one leg, the pedal shaft pin and the single dual chain wheel are driven to rotate downwards with the frame middle shaft as a fulcrum, the gravity produced when the body stands upright and lowers down and the pushing and pulling force of the two hands transfer smoothly, the joint force is given to the pedal shaft pins to drive the single dual chain wheel to rotate, and not only can the purpose of improving the riding speed be achieved and are the pedal shaft pins on two sides located on the same axis line, but also the left and right shaking caused by the alternating application of force by the left and right feet of the traditional bicycle is thoroughly eliminated; and moreover, since the actions that one leg stands upright and the hip lowers down are performed alternately, in combination with the perfect combination of the pushing and pulling force of the two hands, it also achieves the fitness effect of exercising the abdominal muscles and the entire body.

(III) Since the pedal crankshaft surface is provided between the pedal shaft shoulder and the pedal square shaft section on the pedal shaft pin, and the inner hole of the connecting rod pedal hole bush and the inner hole of the pull rod fork hole bush are in rotatable sliding fit with the outer circle of the pedal crankshaft surface, it is easy and smooth to ride the bicycle; since the square hole retaining ring is provided between the step of the pedal crankshaft surface and the single dual chain wheel, the end friction can be effectively reduced; and since the isolating slip ring is provided between the connecting rod pedal hole bush and the pull rod fork hole bush, it is ensured that end face interference does not occur.

(IV) Since the sliding groove pin holes and the sliding rail pin holes can be selectively aligned and are fixed by the groove rail shaft pins, the seat cushion assembly can be moved forwards and backwards, adjusted and fixed on the seat transverse swinging rod, and thus it is suitable for people with different arm length to ride.

(V) Since a layer of titanium alloy hard material is provided on the outer circle of the pedal crankshaft surface, it is ensured that the pedal crankshaft surface is more wear-resistant; since the isolating slip ring and the square hole retaining ring are both made of a copper-based powder metallurgy self-lubricating wear-resistant material, the end friction can be effectively reduced; and it is lighter and quicker to ride.

(VI) The work done jointly by the hands and feet in the present invention is great, the speed is naturally fast, and the force on the chains is also increased. The advantages of the single dual chain wheel in combination with the single dual chain and the single dual ratchet wheel on at least one side of the bicycle rear wheel are that the model size of the chains is particularly enhanced, it is convenient for the selection of standard parts, and in case that the chain on one side is broken, the bicycle can still be ridden to the maintenance point or destination, the situation that the bicycle needs to be pushed to move because “the chain falls off” on the half way is avoided, and this is especially important for the one-leg disabled.

