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United States Patent (19) 11 Patent Number: 4,770,433 Hartmann 45 Date of Patent: Sep

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United States Patent (19) 11 Patent Number: 4,770,433 Hartmann 45 Date of Patent: Sep United States Patent (19) 11 Patent Number: 4,770,433 Hartmann 45 Date of Patent: Sep. 13, 1988 54 MULTIPLESPEED DRIVE FORMOUNTAIN (57) ABSTRACT BICYCLES An enclosed drive for a mountain bicycle features a 76 Inventor: Dirck T. Hartmann, 4121 Morning chain case which replaces the conventional chain stay Star Dr., Huntington Beach, Calif. on the right side of the bicycle coupled with an im 92649 proved twelve speed transmission using four counter shafts, which is housed in a gear case inside the rear (21) Appl. No.: 88,885 wheel hub. The gear case is bolted to a cylindrical ex 22 Filed: Aug. 18, 1987 tension of the chain case which mounts the rear wheel bearing on the right side. The chain case is press fit on 51) Int. Cl." ............................................... B62M 1/00 a steel tube rotatably mounted in the bottom bracket, 52) U.S.C. .................................... 280/260; 280/238; and the chain case cover is a close shear fit on the rear 280/284; 280/289 G spindle which is clamped with over center quick dis 58 Field of Search ............... 280/259, 260, 261, 284, connects in dropouts at the lower ends of conventional 280/285, 289 G, 236, 238 seat stays. To change the rear tire, the rear spindle is 56) References Cited released and the chain case is rotated about the axis of U.S. PATENT DOCUMENTS the bottom bracket to swing the wheel clear of the frame. The wheel can then be separated from the bicy RE 28,335 2/1975 Wood ............................. 280/289 G cle without disturbing or exposing any drive train com 4,706,982 11/1987 Hartmann ........................... 280/260 ponents by removing four wheel nuts and pulling the 4,721,015 l/1988 Hartmann ........................... 280/260 wheel off from the left side. Primary Examiner-John Love Assistant Examiner-Donn McGiehan 6 Claims, 3 Drawing Sheets U.S. Patent Sep. 13, 1988 Sheet 2 of 3 4,770.433 NONN or exerxee &N? assavatahavavassaaravataavavanasaravataxiwa Yarasaaaaaa ?.? S NCSANNSOESOESSINNINNOSTNINCSENCS?KIÑÑ???KOKKDK 24. 2%y NNNNNNNNNNNN ZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZZ 2Øzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzò NYNSSNY NNYYYYY P Ø % (4. O22222222 NN N NN aZZZZZZZZZ N N 3772272177122477-7721/7ZZssss??sssssssssssssssss?sssssssss ZaaZZZZZZZZZZZZZZZZZ 2, ||||||||| FO 3 S &VZ %% Z N FO 4 4,770,433 1 2 tension of the chain case and supports the wheel hub on MULTIPLE SPEED DRIVE FOR MOUNTAIN the right side. BECYCLES The means for selectively locking the driving and driven gears to their respective carriers includes an BACKGROUND OF THE INVENTION 5 external circumferential groove in the carrier in the 1. Field of the Invention: plane of each gear, with the grooves extending radially This invention relates generally to multiple speed inward to a depth equal to about two thirds the thick transmissions using countershafts which are housed ness of the carrier; a pair of diametrically opposed inter within the rear hub of chain driven bicycles coupled nal axial grooves which extend radially outward to a with a modification of a conventional bicycle frame 10 depth equal to about two thirds of the thickness of the which permits the chain to be fully enclosed. carrier; a pair of ring halves installed in each circumfer 2. Description of the Prior Art: ential groove with radial projections locking them to Multiple speed bicycles commonly use either a chain the gear installed over them, and internal teeth for en and derailleur system or a chain driven rear hub em gaging the tooth form on the drive or driven gear selec ploying one or more epicyclic gear trains. Conventional 15 tor which is slidably mounted in the axial grooves; and mountain bicycles and all-terrain bicycles (ATBs) use pin/chain assemblys installed with return springs on the chain and derailleur systems commonly with eighteen centerline of the spindle and connected via conven speeds, of which about fourteen speeds are useable. On tional cable assemblys with shift levers on the bicycle all chain driven bicycles the chain must be kept reason handlebars for controlling the axial position of the drive ably clean and well oiled for efficient operation and to 20 prevent premature chain failure and chain maintenance and driven gear selectors. Each drive and driven gear becomes particularly troublesome if the bicycle is rid with its ring halves locked to it, rotates freely on its den extensively on dirt roads and trails. With the cur respective carrier unless the drive or driven gear selec rent popularity of mountain bicycles, a sealed chain tor is located in its plane. drive is needed to minimize the maintenance problem in 25 An over center quick disconnect comprising a cap a bicycle which can serve for commuting as well as link pinned to the bicycle frame, a pair of spring links off-road recreation riding. An object of the present pinned to the cap link, and a handle pinned to the spring invention is to provide a chain enclosure which essen links, is used to clamp each end of the spindle in its tially eliminates chain maintenance coupled with a mul frame dropout by placing the nose of the handle in a tiple speed transmission housed within a sealed gear 30 notch in the frame on the aft side of the dropout and case inside the rear wheel hub, with a range of gear rotating the handle up and forward to force the spring ratios comparable to the currently popular mountain links overcenter. The wheel is separated from the bicy bicycles using the chain/derailleur system. cle by removing the four nuts from the studs press fit in the hub driving plate, releasing the quick disconnects, SUMMARY OF THE INVENTION 35 rotating the chain case about the axis of the bottom The enclosed multiple speed drive in accordance bracket to swing the wheel clear of the bicycle frame, with the present invention includes a chain case, prefer and pulling the wheel off the mounting studs from the ably of die cast aluminum, with a chain case cover left side. which is attached to it with flush head screws. The chain case is press fit on a steel tube which is rotatably BRIEF DESCRIPTION OF THE DRAWINGS mounted in an otherwise conventional bottom bracket, FIG. 1 is a side elevation view of a mountain bicycle and the chain case cover is a close shear fit on the rear with a chain case and a twelve speed transmission inside spindle. The case and cover replace the conventional the rear wheel hub according to the present invention; chain stay on the right side of the bicycle, enclose the FIG. 2 is a section taken along the line 2-2 of FIG. chain and sprockets, and react the load from drive chain 45 1; tension. FIG. 3 is a section taken along the line 3-3 of FIG. The twelve speed transmission in accordance with 1; this invention is housed in a gear case inside the rear FIG. 4 is a section taken along the line 4-4 of FIG. wheel hub. The gear case is rigidly fastened to the chain 2 case. The transmission includes a drive gear carrier 50 FIG. 5 is a plan view of the drive gear carrier, driven by the rear sprocket with four drive gears rotat FIG. 6 is an end view of the drive gear carrier; ably mounted on it, with a means for locking any se FIG. 7 is a side elevation view of the rear hub; and lected one of the drive gears to the drive gear carrier; a FIG. 8 is a section taken along the line 8-8 of FIG. driven gear carrier with three driven gears rotatably 2. mounted on it with a means for locking any selected one 55 of the driven gears to the driven gear carrier; four coun DESCRIPTION OF THE PREFERRED tershafts with the seven gears on each rigidly joined, EMBODIMENT preferably by flash welding, with each countershaft Referring to FIG. 3, the enclosed chain drive in ac gear in constant mesh with one of the driving or driven cordance with the present invention includes a chain gears; and a conventional one way clutch coupling the 60 case 12; a chain case cover 13; a bottom bracket 15 driven gear carrier with a wheel hub driving plate. The which is integral with the bicycle frame and conven wheel hub is mounted on four studs press fit in the tional except that the chain case replaces the chain stay wheel hub driving plate. The driving plate is mounted on the right side; the left side chain stay 16; and the on an angular contact ball bearing on the spindle and bearing tube 17 which is press fit in the chain case 12. supports the wheel hub on the left side. A wheel hub 65 The bearing tube 17 is mounted with a running fit in the closing plate, which is threaded into a cylindrical exten bottom bracket 15 with its axial position secured by the sion of the wheel hub driving plate, is mounted on an snap ring 18. The end of the bearing tube 17 on the right angular contact ball bearing on a short cylindrical ex side forms the outer race for the ball bearings 23 which 4,770,433 3 4. support the pedal drive shaft 22. The other end of the tions on the ring halves locking them to the gear within bearing tube is threaded to receive the bearing nut 19 which they are installed. A drive gear selector 60 is which forms the outer race for the ball bearings 23 installed in the annular space between the drive gear which support the pedal drive shaft 22 on the left side.
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