Abstract: A gear crank comprising a crank having a pair of crank arms and an adapter having a chain gear, the adapter being provided with two groups of each two stays, the stays in each group being positioned at the rear side in the drive-revolving direction of each crank arm and in a range in which the respective crank arms are subjected to the maximum torque.

Abstract: A pedal for a bicycle, which is provided at the upper surface of a pedal body having a pedal shaft and in the vicinity thereof with a first foot bearing portion with which the head portion of a first metatarsus at a cyclist's foot comes into contact and a second foot bearing portion with which at least a fifth metatarsus among the second and fifth metatarsi at the same comes into contact.

Abstract: A pedal for a bicycle, which is provided at the upper surface of a pedal body having a pedal shaft and in the vicinity of the pedal shaft with a main foot bearing surface with which the metatarsi of a cyclist's foot at the phalange side are brought into contact, and at the rear side of the main foot bearing surface with an auxiliary foot bearing surface with which the metatarsi at the tarsus side are brought into contact.

Abstract: A drop type handle for a bicycle, comprising a first bar body horizontally extending and second bar bodies which have first bent portions in continuation of both lengthwise ends of the first bar body and extending forwardly in a curved manner, second bent portions in continuation of the front ends of the first bent portions and curving downwardly and rearwardly, and second straight portions in continuation of the lower rear ends of second bent portions and extending rearwardly. The first bar body has first grip portions inclined rearwardly and downwardly at lengthwise outer ends with respect to first straight portions at the bar body, and the second bar bodies have second gripping portions being inclined at the front sides inwardly and downwardly with respect to the forward extension lines of the first bent portions respectively, and having third gripping portions inclined at the front sides inwardly with respect to the rearward extension lines of the second straight portions.

Abstract: A brake operating device for a bicycle, comprising: a fixing member comprising a bracket member, a mounting member retained thereto, and a tightening band, and an operating lever; the lever being provided with a support member which supports a retainer at one end of a control wire, the mounting member being provided with an outer stop for an outer sheath guiding the wire, so that the wire and outer sheath are drawn out from below the bracket member toward a handle bar.

Abstract: A brake operating device for a bicycle brake having front wheel and rear wheel brakes is provided with at least one control lever, a movable control member operable in association with operation of the control lever, an associated member for transmitting an operating force of the control lever to the movable control member, a first and a second brake wire transmitting operation of the movable control member to the front and rear wheel brakes, and first and second connecting members connecting the first and second brake wires to the movable control member.

Abstract: A speed-changing device for a bicycle, which comprises a control device having a control lever, a derailleur comprising a fitting member, a four member linkage mechanism having a chain guide and a return spring, and a control wire, said control device having a first positioning mechanism for positioning the chain guide only during returning motion of said chain guide by said return spring, said derailleur having a second positioning mechanism for positioning of said chain guide only during forward motion of said chain guide through a pulling operation of said wire.

Abstract: A handlebar for a bicycle, which comprises a bar body having a mounting portion for a handle stem of the bicycle and gripping members each having a gripping portion, the bar body and gripping members being separate from each other, the gripping members being provided with support brackets for supporting control levers respectively.

Abstract: An operating device for a bicycle, which is mounted on a drop handlebar having a straight portion and bent portions and has a bracket member pivotally supporting a first lever extending along the bent portion and a second lever extending along the straight portion and connected with the first lever, the bracket member and the pivoted bases of the first and second levers being covered with a grip-like shaped cover, and supports each having a height larger than a thickness of the second lever and being disposed between the outer surface of the first side wall pivotally supporting the second lever and the inner surface of the cover opposite to the side wall and at both sides of said second lever in the swinging direction thereof.

Abstract: A speed-changing device which supports an operating lever rotatably to a fixing member having a lever shaft, the lever being provided at a boss thereof with a cavity, the fixing member being provided with a support member entering into the cavity, the cavity housing therein a sound generating mechanism comprising a plurality of recesses and an engaging member, so that a sound generated by the engagement of engaging member with each recess is amplified by resonance of said cavity.

Abstract: A handlebar for a bicycle, which comprises a bar body and attaching members each having a concave surface in cross section to fit the outer periphery of the bar body and being formed in a semiellipse-like shape in cross section, so that the attaching members are fixed to the outer periphery of the bar body along the rear side thereof in the forward moving direction of the bicycle.

Abstract: A pedal for a bicycle, which comprises a pedal shaft and a pedal body, the pedal body having a first foot bearing body which is formed in a frame-like shape and has a front foot bearing surface and a rear foot bearing surface, and a second foot bearing body having a middle foot bearing surface, the front foot bearing surface being formed in an arch matching with the toe arrangement at a cyclist's foot, and the middle foot bearing surface being formed in an arch matching with the line of all balls at his foot from the root of the big toe to the root of the little toe.

Abstract: A running type health promoting device, in which a running vehicle having at least one front wheel and one rear wheel to be driven by pedalling, the vehicle being incorporated with; a microprocessing unit which sets a period of time for training and a proper number of pulses during the training so as to obtain a proper quantity of exercise; a pulse detector for detecting the pulse of a driver who drives the vehicle; a measuring instrument for measuring the time period for training; an indicator for displaying a finish of the time period for training; and a source of electric energy; so that the driver can take proper exercise with interest correspondingly to his age or the like.

Abstract: A water-bottle mounted along the bicycle frame, in which a body is of a block-like shape and thin, a pair of side walls extending longitudinally and vertically of the bicycle, the interval between the outer surfaces of side walls gradually decreasing from the front surface portion to the rear surface portion, and the rear surface portion is formed in a circular arc smaller in a curvature than the surface of a circular arc of the frame, so that the body is formed to be streamlined together with the frame.

Abstract: A derailleur for a bicycle, comprising a derailleur body provided with a fixing member and a four link parallelogram mechanism, the derailleur body being supported swingably with respect to the fixing member, and between the fixing member and the derailleur body is interposed an intermittent feed mechanism, so that a control wire is operated to allow the derailleur body to swing intermittently corresponding to the speed change stages with, respect to the fixing member, and thereafter, the link mechanism at the derailleur body is transformed, thereby switching a driving chain to a desired one of multistage sprockets.

Abstract: A handle stem for a bicycle, comprising a stem body, a projecting portion extending from the top of said stem body radially outwardly thereof, and a holding portion for a handle bar, provided at the foremost end of the projecting portion, so that a hollow, which is provided therein, houses an indicator electrically displaying running conditions of the bicycle.

Abstract: A speed-change operating device mounted directly on a frame of a bicycle, in which a screw thread only is provided at a direct-mounting bed fixed to the bicycle frame by a fixing means, such as welding, and a control lever is assembled in a lever shaft to form a lever unit, so that the lever unit is mounted on the frame by screwing a screw member with the bed.

Abstract: A chain guide for a derailleur for a bicycle, which switches a driving chain to one of multi-stage sprockets and has pulleys meshing with the chain and guiding it to a desired one of the multi-stage sprockets, the pulleys each being divided into a pulley toothed member having a number of teeth and a pulley body having a shaft bore, the pulley body being formed of an elastic material.

Abstract: A detecting device for detecting the number of rotations of a wheel at a bicycle, comprises a fixing member fixed to a hub shaft and a rotary member fixed to a hub shell supported rotatably to the hub shaft, the fixing member being opposite and close to the rotary member, so that at the opposite portions therebetween are provided a detecting element and actuators, the actuators operating said detecting element to thereby provide a detection of the number of rotations of the wheel by use of rotations of the hub shell.

Abstract: A roller chain comprising outer link plates, inner link plates, pins, bushes, and rollers, the bushes each including an elastic member so that a total axial length of the bush including the elastic member controls an interval between opposite inner link plates, the elastic member being elastically deformed to change the interval, the outer surfaces of the inner link plates being kept in close proximity to the inner surfaces of the outer link plates to avoid above entry of dirt or sand therebetween.