Patent GB-191228304-A (GB)
Title: Improvements in Variable-geared Coaster Hubs for Bicycles.
Inventor: OLSEN FREDERIK JOHANNES
IPC: B62M11/14
Filed: 1912-12-07
Granted: 1913-12-08
Abstract: 28,304. Olsen, F. J. Deo. 7. [Addition to 25,680/11.] Variable - speed gearing; back - pedalling brake arrangements. - In the kind of variablespeed hub for bicycles described in the parent Specification, wherein the change of speed is effected by a back-pedalling action and the sunwheel g is for the high gear clutched to the axle by a spring-controlled conical nut h, frictional means are provided for ensuring the axial displacement of the sleeve m when the gear is to be changed. As shown in Figs. 1 and 3, the sleeve is formed with a conical part 40 to impart the drive to the hub on the lower gear, and a spring ring 21 is provided to engage frictionally either the hub or the ring 30 of the brake according to the position of the sleeve. The driving-sleeve d is notched and grooved on its inner surface as shown in Fig. 3, to engage a pair of projections z on the sleeve m, and with the parts in the position shown in Fig. 1 the projections occupy the deep notches so that the sleeve m is in its right-hand position in which it holds the spring n clear of the nut h and engages the hub at 40 for transmitting the direct drive. On back-pedalling, the projections z pass out of the notches z<5> and are then gradually pressed to the left by the inclined surfaces 26. At the time the points 29 are passing the projections, the movement to the left is not complete so that these points clear the projections, but the subsequent further axial movement brings the projections into the path of the points 28 so that they are caught thereby and forced against the action of a spring s into the notches z<6>. The sleeve m has then been displaced to the left so that the teeth 22, 23 are in engagement ready for the application of the brake on further back-pedalling. If, however, the cranks be turned forwards, the combined action of the spring s and of the reverse rotation of the sleeve d causes the projections z to pass into the shallow notches z<7>, and the sleeve ri then occupies an intermediate position in which the spring n bears upon the nut h for turning it to lock the sunwheel to the axle and the part 40 is clear of the hub, the spring 21 bearing upon the ring 30. On further back-pedalling followed by forward pedalling, the projections z pass in similar manner from the shallow notches z<7> to the notches z' and then z<5>. The spring s bears upon a sliding washer 25 so that it is compressed only when the projections are passing into notches z<6> or z<8>. In a modification similar to Fig. 6 of the parent Specification, the sleeve m has a squared portion carrying rollers controlled by a cage which is capable of turning relatively to the sleeve in the low-gear and braking positions, but cannot at any time move axially in relation thereto. The cage has a spring which bears frictionally upon the brake ring 30, and the openings in the part d are formed with inclined surfaces so that for the application of the brake by the rollers the sleeve is displaced clear of the shallow and deep notches in the loose ring. When the projections z engage the deep notches, the part d bears upon a lug on the cage so that the members d, m and the cage turn together, and the rollers remain on the flat faces of the sleeve; when, however, the projections engage the shallow notches or bear upon the opposite edges of the openings in the part d, the cage is capable of relative movement, and the rollers are pressed out into engagement with the hub for transmitting the direct drive or into engagement with the ring 30 for operating the brake, as the case may be.