# US 10,870,464 B2 · Rear gearshift mechanism for coaxial installation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,464 B2 - Document ID: US10870464B2 - Status: Granted - Kind: B2 - Application number: 15/926,194 - Filed: 2018-03-20 - Published: 2018-09-20 - Granted: 2020-12-22 - Earliest claimed: 2017-03-20 - Assignees: SRAM Deutschland GmbH - Applicants: SRAM DEUTSCHLAND GmbH - Inventors: Henrik Braedt - Web page: https://patentgrep.com/patent/US10870464B2 ## CPC - B62M 9/125: Mounting the derailleur on the frame - B62K 25/02: for mounting axles rigidly on cycle frame or fork, e.g. adjustably - B62M 9/1242: characterised by the linkage mechanisms - B62M 9/126: Chain guides; Mounting thereof - B62M 9/127: Mounting or guiding of cables - B62M 9/128: Accessories, e.g. protectors - B62M 9/16: Tensioning or adjusting equipment for chains, belts or the like - B62M: RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR {SINGLE-TRACK} CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES (arrangements or mounting of transmissions in vehicles in general B60K; transmission elements per se F16) - B62K: CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDECARS, FORECARS, OR THE LIKE ## Abstract A bicycle gearshift mechanism has a base element, a pivot mechanism, a movable element, and a chain guide arrangement. The pivot mechanism connects the base element to the movable element. The chain guide arrangement is connected, rotatably about a rotary axle, to the movable element. The base element comprises a first attachment end, which is coaxial with respect to the rear-wheel axle or axis, and a second attachment end for coupling to the pivot mechanism. ## Claims ### Claim 1 A rear gearshift mechanism for coaxial installation on a rear-wheel axis of a bicycle, comprising: a base element, a linkage mechanism, a movable element, and a chain guide arrangement, wherein the linkage mechanism connects the base element to the movable element, and the chain guide arrangement is connected rotatably about a rotary axis, to the movable element, and wherein the base element comprises a first attachment end for coaxial installation on the rear-wheel axis and a second attachment end for coupling to the linkage mechanism, and wherein the first attachment end has a first arm and a second arm, which are arranged so as to be spaced apart from one another along the rear-wheel axis, and in an installed state, the first arm is arranged on an axial inner side of a frame and the second arm is arranged on an axial outer side of the frame. ### Claim 2 (depends on 1) The mechanism according to claim 1, wherein the first arm has a first centring opening and the second arm has a second centring opening. ### Claim 3 (depends on 1) The mechanism according to claim 1, wherein the first arm has, on its axial outer side, an adapter stop surface. ### Claim 4 (depends on 1) The mechanism according to claim 1, wherein the first arm has, on its axial inner side, a hub stop surface. ### Claim 5 (depends on 1) The mechanism according to claim 1, wherein the first arm has, on its axial inner side, a hub guide. ### Claim 6 (depends on 1) The mechanism according to claim 1, wherein the first arm has an axle opening for the leadthrough of an axle, in particular of a thru axle. ### Claim 7 (depends on 1) The mechanism according to claim 1, wherein the base element has an attachment point for a cable diverter. ### Claim 8 (depends on 1) The mechanism according to claim 1, wherein the base element has a first receptacle for a first pivot axle of the linkage mechanism and a second receptacle for a second pivot axle of the linkage mechanism, and wherein the first and second receptacles are each oriented orthogonally with respect to the rear-wheel axis. ### Claim 9 (depends on 1) The mechanism according to claim 1, having an adapter which comprises a screw connection, in particular a bolt with an external thread and a nut with an internal thread. ### Claim 10 (depends on 9) The mechanism according to claim 9, wherein the adapter is insertable into a frame opening and is fixable on the frame by the screw connection. ### Claim 11 (depends on 10) The mechanism according to claim 10, wherein the bolt has a bolt body with a contact region and a compensation region. ### Claim 12 (depends on 11) The mechanism according to claim 11, wherein the adapter, in particular the bolt, has an axle opening in which an internal thread is arranged, into which a counterpart thread of the thru axle can be screwed. ### Claim 13 (depends on 11) The mechanism according to claim 11, wherein a first external diameter of the adapter is coordinated with an internal diameter of a first centring opening of the base element, and a second external diameter of the adapter is coordinated with an internal diameter of a second centring opening of the base element. ### Claim 14 (depends on 13) The mechanism according to claim 13, wherein an external diameter of a bolt foot is coordinated with the first centring opening and an external diameter of the bolt head is coordinated with the second centring opening. ### Claim 15 (depends on 14) The mechanism according to claim 14, wherein the adapter, in particular an axial stop surface of the bolt, bears against the axial adapter stop surface of the base element. ### Claim 16 (depends on 15) The mechanism according to claim 15, wherein the base element has a stop and the adapter has a counterpart stop. ### Claim 17 A rear gearshift mechanism for coaxial installation on a rear-wheel axis of a bicycle, comprising: a base element, a linkage mechanism, a movable element, and a chain guide arrangement, wherein the linkage mechanism connects the base element to the movable element, and the chain guide arrangement is connected rotatably about a rotary axis, to the movable element, and wherein the base element comprises a first attachment end, having a first arm and a second arm, for coaxial installation on the rear-wheel axis and a second attachment end for coupling to the linkage mechanism, and wherein the base element, in particular a hub stop surface of the first arm, abuts in an operationally ready state axially against a hub end cap, and in an installed state, the first arm is arranged on an axial inner side of a frame and the second arm is arranged on an axial outer side of the frame. ### Claim 18 (depends on 17) The mechanism according to claim 17, wherein the first arm is arranged between the hub end cap and the adapter, in particular is fixed in non-positively locking fashion between the hub end cap and the adapter. ### Claim 19 A rear gearshift mechanism for coaxial installation on a rear-wheel axis of a bicycle, comprising: a base element having a rotary axle, the rotary axle of the base element running along the rear-wheel axis of the bicycle, a linkage mechanism, a movable element, and a chain guide arrangement, wherein the linkage mechanism connects the base element to the movable element, and the chain guide arrangement is connected rotatably about a rotary axis, to the movable element, and wherein the base element comprises a first attachment end, having a first arm and a second arm, for coaxial installation on the rear-wheel axis and a second attachment end for coupling to the linkage mechanism, and wherein the linkage mechanism comprises at least one pivot axle which is oriented orthogonally with respect to the rear-wheel axis, and in an installed state, the first arm is arranged on an axial inner side of a frame and the second arm is arranged on an axial outer side of the frame. ### Claim 20 (depends on 19) The mechanism according to claim 19, wherein the linkage mechanism is formed as a four-joint parallelogram with four pivot axles, and all four pivot axles are oriented orthogonally with respect to the rear-wheel axis. ### Claim 21 (depends on 20) The mechanism according to claim 20, wherein a first pivot axle rotatably connects an inner pivot arm of the linkage mechanism to an inner receptacle on the base element and a second pivot axle rotatably connects an outer pivot arm of the linkage mechanism to an outer receptacle on the base element, and the receptacles are aligned axially with the pivot axles. ### Claim 22 (depends on 21) The mechanism according to claim 21, wherein the chain guide arrangement comprises an upper chain guide roller which is rotatably arranged with a constant upper spacing to the rotary axis, and comprises a lower chain guide roller, which is arranged rotatably with a constant lower spacing to the rotary axis.