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J. M. Downer. Bicycle Brake

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J. M. Downer. Bicycle Brake (No Model.) J. M. DOWNER. BICYCLE BRAKE. No. 606,834., _ ‘ Patented June 28, 1898. 1 % f llmrnn FFlCFt JOHN MITCHELL DOWNER, OF TORONTO, CANADA. BICYCLE-BRAKE. SPECIFICATION forming part of LettersPatent No. 606,334, dated June 28, 1898.. Application ?led Decen1her.18,‘189‘6. Serial No, 616,150. (No model.) To aZZ whom it may concern. Referring ?rst more particularly to Figs. 1 Be it known that I, J OHN MITCHELL Dow~ and 2, A represents the hub, formed in one NEH, a subject of the Queen of Great Britain, withor connected to the tubing or framing 55 residing at the city of Toronto, in the county of the bicycle and provided with anysuitable of York and Province of Ontario, Canada, antifrietion "devices a a to insure easy run have invented a certain new and useful Im ning, B and B’ are the pedal~crank_s_, and O provement in Bicycle-Brakes, of which the the driving-axle, all‘ of any approved con following is a speci?cation. ‘ struction. - D is the sprocket, ?xed upon said This invention relates to bicycle- brakes axle as usual and by preference having of that class which are applied through the formed upon its inner face an annular groove sprocket driving-wheel by the action of back cl to loosely receive the rim of a tubular ex pedaling, and has for its object to produce a tension A’ of the hub or framing A. This brake which shall be positive and direct in tubular extension is preferably somewhat 65 its action, easily applied, either instantane— larger in diameter than the main body of the onsly or gradually, and one which shall be hub and serves to inclose and protect myim simple and cheap in construction, not liable proved brake mechanism, which, as herein~ to get out of order, and one which will not add before pre1nised,consists of one or more brake materially to the weight of the bicycle or inter shoes E, pivoted at e to the inner face of the fere in any way with its easy running. sprocket D, and a cam F for operating said 20 The essential features of my invention con brake-shoe or brake-shoes made in one with sist in a cam ?xed upon the crank-axle and or ?rmly ?xed upon the crank-axleO. a brake-shoe pivotally‘ connected to the‘ Connection between the crank B and the sprocket and adapted to be thrown into fric sprocket D is made by means of the pin 1), 75 tional contact with a stationary. part of the ?tting into said crank B and ‘projecting 25 framing of the bicycle by the action of back-' through a curved‘ slot d’, formed in the pedaling. sprocket D, or this connection ‘may be made For full comprehension of the invention in any other convenient way~—such as by reference must be had to the accompanying means of the ?nger d2, projecting from the drawings, forming part of this speci?cation, inner side of the crank-arm B andentering a in which similar letters of reference indicate depression (13 in the web of the sprocket D, like parts in the several ?gures. as shown in Figs. 5 and 6 of the drawings, or In said drawings, Figure 1 represents a 1011— in any other convenient manner, the other gitudinal sectional elevation showing a bicy conditions and arrangements being practi~ 85 cle crank-axle in connection with the hub, cally the same as hereinbefore described. 35 sprocket, and pedal-cranks and illustrating It must be understood that I reserve to the improved brake thereto applied. Fig. 2 myself various forms of arrangement of the is a vertical sectional elevation taken on the ‘brake-shoes E in connection with the sprocket line a: :c, Fig. 1, looking toward the sprocket D and tubular extension A’. For instance, and showing the cam engaging two brake the pivot e may serve to support and connect shoes separately pivoted," the‘ brake being. two brake-shoes, as in Fig.‘ 3, or one brake shown in operation. Fig. 3 is a View taken shoe only7 as in Fig. 4-, or there may be two on similar lines, but showing the two brake pivots, one carrying "each brake-shoe, as in shoes carried on the same pivot and a differ Fig. 2, or a pivot-point might project from ent form of returning-spring, the brake being one member into another, or there might be 45 also shown in operation. Fig. 4 represents no special pivot between the brake-shoes and another modi?cation on the same line, show~ the contiguous surfaces, but reliance be had ing the cam with only one brake-shoe and entirely upon the spring G (of which I have without a spring. Figs. 5 and 6 are details shown various modi?cations) to retain and showing parts of one crank ~ arm and the return the parts to either position when the sprocket and illustrating a modi?cation of cam is either in or out of action, or any other the means connecting same to insure their co modi?ed arrangement upon the same princi operation. ple might be adopted without departing from 2 606,334 my improvement, and other variations of con 1. In a bicycle-brake the combination with struction may be substituted without any es the crank-hanger and crank-axle, of the sta sential change of structure or Without de tionary sleeve or ring carried by the hanger, parting from the essential principle of the the sprocket-wheel having a limited move 30 improvement. ment on the crank-axle, a brake-shoe pivoted The operation of my improved bicycle to the sprocket~wheel and adapted to bear brake may be described as follows: When" against the inner face of the stationary sleeve, a steep downgrade may be encountered or and the cam on the crank-axle adapted to op when it is desired at any time to slow up or‘, erate the brake-shoe, substantially as de 35 IO to quickly stop the forward movement of the scribed. ‘ bicycle, a slight back-pedalin g motion is im-' 2. In combination with the crank-hanger parted to the pedal-cranks, (more especially and crank, the stationary sleeve carried by to that crank marked B, immediately adja-\ the hanger, the sprocket - wheel rotatably cent to the sprocket,) which retarding move-’ mounted upon the axle, a spring - pressed 15 ment of the pedals and their axle has the ef- _ brake-shoe pivoted to the sprocket within the feet of operating the cam F and bringing its wheel, the cam on the axle adapted to con longer surfaces or points into contact with tact with the brake-shoe, and the projection the brake-shoe or brake-shoes E in such man from the crank engaging an elongated slot or ner as to press same into frictional contact recess ‘in the sprocket, substantially as de 45 with the inner side of the rim of the tubular scribed. - extension A’ of the stationary hub or frame Toronto, 4th day of December, 1896. A, which frictional contact causes the grad JOHN MITCHELL DOIVNER. ual or immediate suspension of progress of the wheel according to the will of the rider. \Vitnesses: 25 “That I claim, and desire to secure by Let Ronr. A. KELLOND, ters Patent, is E. LONG. .
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