A silent hub structure includes a hub housing, an interlocking ring, a detent ring and a cassette base. The interlocking ring is installed inside the hub housing and has a central through-hole slot therein through which a detent ring is rotatably disposed therethrough. The through-hole slot is internally and circumferentially provided with a plurality of receiving grooves recessed at an equal distance therebetween on the internal wall. Each of these receiving grooves is disposed with a metal roller pin along the axial direction. The forward-rotating direction side of every receiving groove forms a clamping portion; a magnetic member is disposed in the interlocking ring near the clamping portion of each of the receiving groove separately, whereas the backward-rotating direction side of every receiving groove forms a releasing portion.

A spring component for a ratcheting mechanism, such as a ratchet wrench. The spring component is shaped to be retained in a recess without any special machining. For example, the spring component can be retained at three abutment points. A leaf of the spring component can abut a pawl, and a base portion opposite the leaf can abut the drive gear. Support arms can abut the sidewall of the recess to retain the spring component within the recess without the need for special machining or tooling.

A bicycle hub includes an axle, a main body, a freehub body, and a clutch, which are engaged with the axle, wherein the clutch includes a first ratchet and a second ratchet. The first ratchet and the second ratchet are respectively engaged with the main body and the freehub body. The first ratchet has a first engaging surface, and the second ratchet has a second engaging surface facing the first engaging surface. The bicycle hub is characterized in that a minimum of number of first ratchet teeth on the first engaging surface is seventy-two, and a number of the second ratchet teeth on the second engaging surface is lesser than the number of first ratchet teeth. With such design, when the first ratchet is meshed with the second ratchet, the freehub body could stably drive the main body, and a total weight of the bicycle hub could be decreased.

A directional transmission mechanism, a directional sprocket apparatus using the directional transmission mechanism, and a pedal device using the directional sprocket apparatus are disclosed. The directional transmission mechanism includes a driving shaft, an output shaft, a co-rotating wheel, a reverse-rotating wheel, and a switching mechanism. The co-rotating wheel set drives the output shaft to rotate in a direction that is the same as that of the driving shaft. The reverse-rotating wheel set drives the output shaft to rotate in a direction opposite to that of the driving shaft. The switching mechanism switches the driving shaft to drive the co-rotating wheel set or drive the reverse-rotating wheel set to rotate, so as to enable the output shaft to rotate directionally. The co-rotating wheel set is connected with the driving shaft and the output shaft, and the reverse-rotating wheel set is connected with the driving shaft and the output shaft.

A one-way driving mechanism for a cordless window blind essentially includes two volute spring gears, which are meshed with each other, and a volute spring connected between the volute spring gears. The volute spring gears each meshes with a cord gear. Each of the cord gears is connected with a cord, which is encircled with a single loop by a clutch wheel. Each clutch wheel is provided therein with a position-securing member.

A gear train assembly comprises a gear train and a motor to drive the gear train. A shaft which is driven by the gear train, a rubber roller engaging the shaft and being co-axial therewith. The gear train also comprises a roller gear disposed on the shaft. The roller gear disengages from a second gear that drives the shaft or the rubber roller in response to pulling of media from the peripheral containing the gear train.

A charging mechanism for charging a stored-energy spring of a stored-energy spring mechanism includes a charging gear coupled to the stored-energy spring, an intermediate shaft coupled to the charging gear, an idler gear that can be driven by a charging motor, a freewheel coupled to the idler gear, and a dog clutch that couples the freewheel to the intermediate shaft in order to charge the stored-energy spring and uncouples same from the intermediate shaft in the charged state of the stored-energy spring. The dog clutch has a first clutch block coupled to the intermediate shaft for conjoint rotation, and a second clutch block connected to the freewheel. The first clutch block can be displaced along an axis of rotation of the intermediate shaft between two end positions and, in an intermediate position between the end positions can be freely rotated only in a direction of rotation with respect to the second clutch block.

A brake roller may comprise a brake shaft and a brake stack assembly located around the brake shaft. A one-way jaw clutch assembly may be configured to apply a force to the brake stack. A roller shell may be located radially outward of the brake stack. The one-way jaw clutch assembly may be configured to vary the force applied to the brake stack in response to a rotation of the roller shell in a circumferential direction.

Transmission gear box (1) comprising, at least partially accommodated in the housing (1), an output shaft (6), a rotating drive member (5) mounted to rotate freely about the shaft (6), a system (2) for rotating the rotating drive member (5) in forward and reverse gear and, arranged between the shaft (6) and the rotating drive member (5), a clutch mechanism (3) having an engaged state and a disengaged state, wherein the shaft (6) is free to rotate in any of the directions of rotation thereof, the automatic clutch mechanism (3) being configured, in forward gear, to shift from the disengaged state to the engaged state by rotating in forward gear the motor member (5) when the speed of rotation of the rotating drive member (5) is higher than that of the shaft (6), and from the engaged state to the disengaged state by rotating in forward gear the shaft (6) when the speed of rotation of the shaft (6) is higher than the speed of rotation of the rotating drive member (5). The clutch mechanism (3, 4) is also automatic in reverse gear.

A bicycle hub includes an axle, a main body, a freehub body, and a clutch, which are engaged with the axle, wherein the clutch includes a first ratchet and a second ratchet. The first ratchet and the second ratchet are respectively engaged with the main body and the freehub body. The first ratchet has a first engaging surface, and the second ratchet has a second engaging surface facing the first engaging surface. The bicycle hub is characterized in that a minimum of number of first ratchet teeth on the first engaging surface is seventy-two, and a number of the second ratchet teeth on the second engaging surface is lesser than the number of first ratchet teeth. With such design, when the first ratchet is meshed with the second ratchet, the freehub body could stably drive the main body, and a total weight of the bicycle hub could be decreased.