Sram Corporation

Sram Deutschland Gmbh

Raymond Florczyk

Henrik Braedt

Markus Reiter

Marcus Auer

Christian Desenclos

Arndt Gockisch

Philipp Hölle

Christian Buettner

Hung-I Chen

A bicycle chainring for engagement with a drive chain includes a plurality of teeth extending from a periphery of the chainring wherein roots of the plurality of teeth are disposed adjacent the periphery of the chainring. The plurality of teeth include a first group of teeth and a second group of teeth.

Chainring

A bicycle chainring includes a plurality of teeth extending from a periphery of the chainring wherein roots of the plurality of teeth are disposed adjacent the periphery of the chainring. The plurality of teeth include a first group of teeth and a second group of teeth, each of the first group of teeth wider than each of the second group of teeth. At least some of the second group of teeth are arranged alternatingly and adjacently between the first group of teeth, and wherein the periphery of the chainring is generally non-circular.

A bicycle chainring for engagement with a drive chain includes a plurality of teeth extending from a periphery of the chainring wherein roots of the plurality of teeth are disposed adjacent the periphery of the chainring. The plurality of teeth include a first group of teeth and a second group of teeth, each of the first group of teeth wider than each of the second group of teeth. At least some of the second group of teeth are arranged alternatingly and adjacently between the first group of teeth, and at least some of the first group of teeth are asymmetrically wider than each of the second group of teeth.

A bicycle chainring includes a plurality of teeth extending from a periphery of the chainring wherein roots of the plurality of teeth are disposed adjacent the periphery of the chainring. The plurality of teeth include a first group of teeth and a second group of teeth, each of the first group of teeth wider than each of the second group of teeth, and at least some of the second group of teeth arranged alternatingly and adjacently between the first group of teeth, wherein the center of a top land of at least some of the first and second groups of teeth are offset from a plane in a direction toward one of the inboard and outboard sides of the chainring.

A bicycle chainring includes a plurality of teeth extending from a periphery of the chainring wherein roots of the plurality of teeth are disposed adjacent the periphery of the chainring. The plurality of teeth including a first group of teeth and a second group of teeth, each of the first group of teeth wider than each of the second group of teeth. At least some of the second group of teeth are arranged alternatingly and adjacently between the first group of teeth, each of the plurality of teeth includes an outboard side and an inboard side opposite the outboard side and one of the inboard and outboard sides of each of the second group of teeth includes a link-receiving recess formed in the chainring.

A bicycle chainring includes a plurality of teeth extending from a periphery of the chainring wherein roots of the plurality of teeth are disposed adjacent the periphery of the chainring. The plurality of teeth include a first group of teeth and a second group of teeth, each of the first group of teeth wider than each of the second group of teeth. At least some of the second group of teeth arranged alternatingly and adjacently between the first group of teeth, and at least some of the first and/or second group of teeth being asymmetric along the chainring circumference.

A solitary chainring of a bicycle front crankset for engaging a drive chain, including a plurality of teeth formed about a periphery of the chainring, the plurality of teeth consisting of an even number. The plurality of teeth includes a first group of teeth and a second group of teeth arranged alternatingly between the first group of teeth. The first group of teeth and the second group of teeth are equal in number. Each of the first and second group of teeth include an outboard side and an inboard side opposite the outboard side and each tooth of the first group of teeth includes at least a first protrusion on the outboard side thereof and each tooth of the second group of teeth are free of the first protrusions on the outboard side and the inboard side.

The invention relates to a sprocket assembly for mounting on a driver of a rear wheel hub of a bicycle. By means of a threaded element, a sprocket cluster and a separately embodied ring element are axially clamped together, and a rotation-coupling device is provided between the sprocket cluster and the ring element. Knurled teeth features on the threaded element and ring element prevent the loosening of the threaded element. Through the separate embodiment of the ring element and sprocket cluster, the respective most suitable manufacturing methods can be used for the two parts and, in the event that the sprocket cluster is manufactured by means of machining methods, the knurled features on the ring element can also be produced in a cost-effective and precise manner through shaping methods.

Sprocket assembly

A chain guide for a front derailleur includes inner and outer guide plates. The outer guide plate includes an interior surface having a guide surface that protrudes toward the chain. During the shifting from a larger chainring to a smaller chainring, the chain grazes against the guide surface and is shifted to an adjoining chainring by the guide surface. Viewed in a chain travel direction, the guide surface has a width at least equal to a distance between consecutive outer chain links or a width at least equal to the distance between the link pins. So configured, the noise generated by the dipping of the chain guide into the space between the outer chain links and/or between any protruding link pins is minimized during the shifting process.

Chain guide for a front derailleur

A front derailleur that includes a derailleur housing having a tubular clamp and a chain guide coupled to parallelogram arms. A pivotal transfer element transfers the shifting motion through a pull cable to the chain guide. The shifting momentum is supported by a derailleur housing having a support extension extending in a support direction along the bicycle frame beyond the hinge of the tubular clamp. The transfer element is pivotally mounted to the derailleur housing by a pivot pin. The return spring is disposed around the pivot pin and is supported on a spring stop of the derailleur housing. The return spring is partially surrounded by a spring cover, which is integrated into the derailleur housing, all of which is protected from dirt by a second covering. The bores for accepting the adjustment screws, which are inclined relative to the frame tube in order to improve accessibility, are located in the spring cover.

Front derailleur

A rotatable handgrip shifting device () that is mountable on a bicycle handlebar and connected to a bicycle gear changing mechanism by a cable within a tube and reversibly operable at discrete shift points corresponding to the gears of the bicycle gear changing mechanism. The shifting device () includes a handgrip () rotatable about the handlebar, a spool () rotatable with the handgrip () and a housing () that secures the shifting device () to the handlebar. The housing () includes a gear display () denoting a plurality of discrete shift points of the gear changing mechanism. A flexible member () includes at one end a pointer () and a spool tab () at another end. The pointer () is reciprocally displaceable along the gear display () in response to rotation of the handgrip (). The spool tab () is removably attachable to the spool () or the handgrip () and configured such that the flexible member () spools at a radius permitting alignment of the pointer () with the plurality of discrete shift points denoted on the gear display ().

Bicycle gear indicator mechanism

A device for switching a chain on different sprockets of a pedal bearing mounted to a seat tube of a frame of a bicycle. The chain switching device includes a cage which can be economically manufactured in a plurality of constructions and readily mounted on different bicycle frames with different angles between a seat tube and a chain brace in order to achieve optimum operating angles with appropriately modified cages. The different cage constructions are manufactured from a single sheet metal blank and have brackets arranged at different positions and of different lengths which are formed by appropriately positioning their bending edges to attach the cage to a parallel guide device.

Growing community of inventors

Schwebheim, Germany

Raymond Florczyk