Abstract: The shiftable bottom bracket gear train according to the invention for a bicycle or the like comprises a bottom bracket tube, a gear train housing having an associated sprocket and a disk arranged parallel thereto, and a drive shaft, which penetrates the bottom bracket tube in the axial direction and is operatively connected to pedal cranks and in which a shifting axle is arranged, which is connected to a coupling piece and can be actuated from the outside by means of a shifting element. In the shiftable bottom bracket gear train, the torque support of the gear train engages on the bottom bracket tube (1) or on an adapter (2) inserted in the bottom bracket tube (1), and is implemented by using screws (8) or screw connections (4,5,12), pins (9, 17), cams (14), or clamps (13).

Abstract: The present invention relates to a toothed belt wheel (1), in particular for bicycles or motorcycles, for torque transmission from the crankshaft or engine shaft to the rear wheel. The toothed belt wheel (1) consists of individual disc-shaped elements (2, 3, 4; 10, 11, 12), which are fixedly connected to one another to form a unit. The toothed belt disc (9) of the toothed belt wheel (1), which is intended for the engagement of a toothed belt, is assembled from at least two elements (2, 3; 10, 11), specifically a carrier disc (2) and one or more tooth discs (4). In addition, a flanged disc (3) can also be arranged on the toothed belt disc (9).

Abstract: The shiftable bottom bracket gear train according to the invention for a bicycle or the like comprises a bottom bracket tube, a gear train housing having an associated sprocket and a disk arranged parallel thereto, and a drive shaft, which penetrates the bottom bracket tube in the axial direction and is operatively connected to pedal cranks and in which a shifting axle is arranged, which is connected to a coupling piece and can be actuated from the outside by means of a shifting element. In the shiftable bottom bracket gear train, the torque support of the gear train engages on the bottom bracket tube (1) or on an adapter (2) inserted in the bottom bracket tube (1), and is implemented by using screws (8) or screw connections (4,5,12), pins (9, 17), cams (14), or clamps (13).

Abstract: A shiftable drive mechanism for bicycle or similar is proposed which includes a driveshaft and coupling supported at the driveshaft and movable in axial direction relative to the driveshaft and a first and second function element fro transmitting power to a housing and wherein the coupling with its two coupling members having a first function element with a recess formed as curved tracks, alternatively a second functional element with a recess formed as curved tracks such that upon a rotational movement about the longitudinal axis the at least two coupling members are sequentially and form fittingly engaging the curved tracks recesses.

Abstract: The invention relates to an apparatus for actuating a switch shaft (30) which is operatively connected with a switchable bottom bracket bearing gear (10) for a bicycle or the like, which shaft is arranged and held coaxially in a drive shaft (35) which is provided on at least one end with a torsionally rigidly arranged crank (1,2). In order to achieve a change in the rotational speed a first coupling member (23) is arranged on the drive shaft (35), which member is displaceable in the axial direction by means of the switch shaft (30), as a result of which the power transmission elements of the bottom bracket bearing gear (10) can be brought into form-locked and non-positive engagement with one another.

Abstract: A shiftable pedal bearing gearing for use in a pedal bearing of a type having a pedal bearing housing and a crank axle axially traversing the pedal bearing housing and carrying at least one pedal crank, for use in a bicycle or the like, includes a chainwheel mounted on the crank axle and a disk extending parallel to the chainwheel. Arranged between the chainwheel and the disk is a coupler which is rotatably mounted on the crank axle and movable in axial direction between two switching positions. The coupler, on the one hand, and the chainwheel and disk, on the other hand, have opposing sides of complementary configuration to allow interlocking or form-fitting connection at uniform surface pressure between said coupler and the chainwheel in one switching position and the disk in the other switching position.

Abstract: A shiftable pedal bearing for a bicycle or the like includes a pedal bearing housing supporting a hollow crank axle carrying pedal cranks, and a gear casing with pertaining chainwheel and accommodating a disk which extends parallel to the chainwheel. Arranged in the crank axle is a switch shaft which is actuatable from outside by a shifter so that a coupler, which is operatively connected to the switch shaft, is selectively engageable with circumferential recesses in the chainwheel and a disk. Each recess of the chainwheel and each recess of the disk is of stepped configuration to define a first recess section and a second recess section, with the coupler in a first stage engaging the first recess section with play and in a second stage snugly fitting in the second recess section with no play.