摘要:
A power transmission mechanism includes a gear member and an annular and eccentric floating member having internal gear teeth meshed with external gear teeth of the gear member. A pair of guide plates provided on both outer sides of either the gear member or floating member prevent lateral disengagement of the floating member from the gear member. A pair of seal rings arranged between the inner sides of the guide plates and the outer sides of either the floating member or gear member prevent entry of dust or the like foreign material into a substantially closed space between the teeth of the gear member and the floating member, to thereby improve the durability of the mechanism.
摘要:
The disclosed speed-change gear includes a fitting secured to the frame of a bicycle, a parallel link means having an outside link and an inside link whose one ends are pivotally connected to the fitting, a movable member pivotally connected to the opposite ends of the inside and outside links, a changeover frame rotatably secured to the movable member, which changeover frame carries a guide wheel and a tension wheel of a chain, and a cam means adapted to selectively move said movable member so as to shift the speed-change ratio by changing the position of said changeover frame to shift the chain to the desired step of a multi-step sprocket assembly of the bicycle. The cam means has a spring-biased cam rotatably mounted on a shaft connecting the outside link to the fitting, which cam rotates together with a wire-operated reel coaxially mounted on said shaft. The rotation of the cam actuates said parallel link means through a lever pivotally carried by a shaft connecting the inside link to the fitting.
摘要:
A caliper brake for a bicycle comprising left and right caliper arms rotatably fitted to a pivot shaft and having at their ends brake shoes adapted to be urged against a rim of a wheel of the bicycle, a rocking arm having a base portion pivotally mounted to a frame of the bicycle between the caliper arms on the pivot shaft in a semi-fixed condition, and the rocking arm having at its end a through-hole, opposite to which the left and right caliper arms have bottomed holes, respectively, and a universal joint lever having at its middle portion a middle protrusive ball portion and at both its ends end protrusive ball portions, respectively, the middle protrusive ball portion fitting in the through-hole of the rocking arm, those end protrusive ball portions fitting in the bottomed holes of the left and right caliper arms, respectively, whereby the extent of the free gaps between the left and right brake shoes and the rim are maintained substantially equal. Even if the free gaps become unequal, the normal condition having equal gaps can be automatically restored by subsequent braking operation.
摘要:
A vulcanizer constructed in that a body structure which is wide in the vertical direction is provided above a lower frame for supporting a lower mold in such a manner that an opening/closing and tightening mechanism is disposed below a laterally extending plane of an upper mold and a lower mold. Accordingly, there is no opening/closing and tightening mechanism in the periphery of a radial direction of the upper and lower molds, which makes it possible to utilize a split mold of a complex shape.
摘要:
The following technical measure is taken to provide a bicycle speed change system or method wherein a speed change operation can be performed substantially without unhanding a handlebar and without erroneously shifting to a lower or higher speed.Specifically, the bicycle speed change system (1) comprises a front speed shifter (1a), a rear speed shifter (1b), and speed change operation assemblies respectively including cylindrical operation members (4a, 4b) rotatably supported around right and left grip portions (3a, 3b), respectively, of a handlebar (2); each of the shifters being operated by a control cable (T) which is pulled or released by rotating a corresponding one of the cylindrical operation members, wherein each of the cylindrical operation members (4a, 4b) is designed so that rotation thereof in a direction of moving its top surface rearward causes a corresponding one of the shifters (1a, 1b) to shift to a lower speed position.
摘要:
A friction stepless speed change device includes an input shaft, a driven shaft and an output shaft arranged on a common axis, and a countershaft rotatably provided in parallel with the common axis. The device further includes tow rockable arms rockable about the countershaft, a cylindrical driving rotary assembly rotatably provided on free ends of the rockable arms to enclose the driven shaft, a set of driving friction discs rotating together with the driving rotary assembly, and a set of driven friction discs rotating together with the driven shaft. The countershaft includes a first gear in mesh with a gear fixed to the input shaft, a second gear in mesh with a gear fixed to the driving rotary assembly, and a third gear in mesh with a sun gear of a planetary gear provided on the driven shaft. The output shaft is integrally formed with an internal gear in mesh with planet gears of the planetary gear.
摘要:
A stepless speed change device including an eccentric cam assembly whose eccentricity is adjustable relative to a center shaft, a carrier rotatably arranged about the eccentric cam assembly, rotary members on input and output sides, respectively, and a plurality of friction pieces arranged in two rows each including a plurality of the friction pieces. The friction pieces in one row are rockably connected to the rotary member on the input side and free ends of the friction pieces are engaged with an inside of the carrier. The friction pieces in the other row are rockably connected to the carrier and free ends of the friction pieces are engaged with an inside of the rotary member on the output side. As an alternative, all the friction pieces are rockably connected to the carrier and free ends of the friction pieces in one row and the other row are engaged with insides of the rotary members on the input and output sides, respectively.
摘要:
A stepless speed change device comprises internally toothed ratchet rings arranged in plural rows side by side in an axial direction on an inner circumference of a driving rotary member on an input side through one-way clutches interposed therebetween, a stationary ring fixed to a frame of a bicycle and encircling the driving rotary member, a plurality of planet rollers rotatably fitted in the driving rotary member at plural locations, pawls in plural rows to engage ratchets of the internally toothed ratchet rings and having bottoms pivotally connected to an eccentric cam whose eccentricity relative to a center shaft is adjustable, and a resilient member provided in contact with the planet rollers to produce the frictional transmission between the stationary ring and the internally toothed ratchet rings respectively and the planet rollers. When the driving rotary member is being rotated the planet rollers are revolved together with the driving rotary member and at the same time are rotated about their axes with the aid of the frictional transmission and the internally toothed ratchet rings are rotated by the planet rollers with the aid of the frictional transmission.
摘要:
A stepless speed change device for a bicycle comprises a plurality of planetary members journaled in a carrier fixed to a crankshaft of the bicycle in two parallel planes perpendicular to the crankshaft, planetary gears respectively fitted on the planetary members through one-way clutches so as to rotate in one direction, an eccentric shifter having a circular track for guiding rocking pins extending from and eccentric to the planetary members, the eccentric shifter capable of changing its eccentricity relative to the crankshaft and a sun gear connected to a crank gear as an output portion of the device, thereby making it possible to make the diameters of the planetary gears much larger than that of the sun gear so as to make much larger the speed-up transmission ratio and at the same time increase the number of planetary gears to make small pulsations in transmission force. According to the invention, the device includes a speed change operating device having for itself a performance of a reverse input allowing device so as to effectively bring the stepless speed change device into practical use. In this manner, the stepless speed change device becomes light weight and small-sized as a whole.
摘要:
A bicycle frame comprises a main frame having a head tube portion and a seat tube support portion integrally formed of a single blank tube, a seat tube inserted in the seat tube support portion of the main frame and having a cross-shaped lower end formed from a single blank tube by bulge-forming, a metal fitting having an aperture adapted to receive a lower end of the seat tube and chain stay supports on both sides of the aperture, two chain stays having front ends fixed to a mid portion of the main frame and mid portions abutting against the chain stay supports of the metal fitting, and rear forks connecting rear ends of the chain stays and an upper end of the seat tube. Two lateral expanded portions of the cross-shaped lower end are pierced to form apertures into which commercially available bearings are press-fitted to form a hanger portion or bottom bracket of the seat tube.Production processes are simplified to improve the productivity of bicycles. Increased strength of the frame makes it possible to use thinner tubes for the frame to reduce the entire frame weight and hence cost.