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Publication numberUS596289 A
Publication typeGrant
Publication dateDec 28, 1897
Filing dateAug 31, 1896
Publication numberUS 596289 A, US 596289A, US-A-596289, US596289 A, US596289A
InventorsThomas Smith
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
William thomas smith
US 596289 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

(N0 Model.)

W. T. SMITH. DRIVING GEAR FOR VELOGIBEDBS.

No. 596,289. Patented Deo. 28,1897.

WILLIAM THOMAS SMITH, OF BOLTON, ENGLAND.

DRIVING-G EAR FOR VELOC-IPEDES.

SPECIFICATION forming part of Letters Patent No. 596,289, dated December 28, 1897. Application tiled August 31, 1896. Serial No. 604,372. (No model.)

To LZZ whom t may concern.:

Be it known that I, WILLIAM 'IrtoivrAsv SMITH, a subject of the Queen of Great Britcaster county, England, have invented certain new and Improved Driving-Gear for Velocipedes, of which the following description is a specification.'

In connection withA the driving-gear of ve-` cle more evenly throughout the entirety of\ each revolution of the crank without entailing the use of mechanism which will greatly add to the cost of production of the velocipede or which will engender other disadvantages is the object of this invention, and this object I attain by the employment of the mechanism illustrated by the accompanying sheets of drawings, in which- Figure l is a part sectional elevation of such a portion of a velocipede with my improved driving-gear applied thereto as is necessary to show how the latter may be put into use. Figs. 2 and 3 are similar views to Fig. l, but show in each case the employment of only one guide-pulley, the same being mounted to guide the chain in itsupper and lower paths,

`parts throughout the several views.

B indicates portions vof the velocipedes framework upon which the crank-spindle a and the spindle b of the velocipedes drivingwheel f are mounted, while c' are the cranks fixed to said spindle aand carrying the pedals dl On the spindle a I fix the well-known elliptical driving-wheel e, its larger diameter being at or about right angles to the radial arms or cranks c. Thus when these cranks c arein position for the rider to have the greatest power over them this power or force will at this time be transmitted by the chain g to the'driving-wheel f through the greater diameter of the elliptical wheel e in a manner vcircular driving-wheel is employed, I secure an ordinary sprocket-wheel h on the hub lof Ithe rear wheel, whileguideepulleys p p',

mounted to revolve on fixed bearings qq', are arranged in such positions relatively with the wheel c as to keep the chain gat its proper' tension, this position being clearly deiined as the center of the arc 3 4, (shown in broken lines, Fig. 1,) which bisects the horizontal planes in which the chain g travels and the vertical plane through the spindle a. Thus the slight variations in the tension of the chain g are represented by the distance that said arc 3 4 passes out of the vertical linel 2. In other Words, each of the Wheels p or p is so situated in its fixed location that although it delects the chain but slightly, if at all, when the longer radii of the elliptical wheel are at a right angle to the path of movement of the Wheel it materially deflects said chain when the shorter radii of the elliptical wheel are at a right angle to said path of movement. This will be evident by referring to Fig. 1, from which iigure it will be clear that if theguide-wheels Were omitted the chain would be very slack or loose when the ellip- However, when this ellipl tical 'Wheel is in the position indicated by full lines in said ligure. Again, I iind that one guide-wheel p, as shown by Fig. 2, or one, p', as shown by Fig. 5, is quite suicient to maintain the chain g in its proper positions on the wheels e h', and either or any of these devices may be employed when the wheel e has a circumference greater or less than twice that of the wheel 7L.

Having thus described the nature and object of my invention, what I consider new, and therefore claim, is-

l. In a velocipede, the combination of an elliptical driving chain-wheel, a concentric driven chain-Wheel, a chain connecting them, and a concentric guide-wheel mounted to re- IOO volve on iixed bearings, the outer portion of the periphery of the guide-Wheel being situated outside of a line drawn from the periphery of the concentric driven Wheel to the shorter radius of the elliptical Wheel, Whereby the path of movement of the chain is de- Iiected more or less according to Whether the shorter or the longer `radius respectively of the elliptical Wheel is at a substantial right angle to said path of movement.

2. In a velocipede, the combination of an elliptical driving chain-Wheel, a concentric driven chain-Wheel, a chain connecting them, and a pair of concentric guide-Wheels, one for each stretch of the chain and mounted to revolve on fixed bearings, each of said guide- Wheels having the outer portion of its periphery situated outside of aline drawn from the periphery of the concentric driven wheel to the shorter radius of the elliptical Wheel, whereby the path of movement of the chain is deflected more orless according to whether the shorter or the longer radii respectively of the elliptical Wheel are at a substantial right angle to said path of movement.

XVILLIAM THOMAS SWITIT.

lVitnesseS:

JOHN WHITEHEAD, SAMUEL HEY.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3259398 *Dec 9, 1964Jul 5, 1966Green William PBicycle drive
US4133550 *Feb 3, 1978Jan 9, 1979Brown Lawrence GBicycle and power transmission system
US5882025 *Feb 1, 1996Mar 16, 1999Runnels; David J.Bicycle with rhombus-like gear with circularly curved apexes
US7125356Nov 6, 2001Oct 24, 2006Borgwarner Inc.Tension-reducing random sprocket
US7520028 *Feb 18, 2005Apr 21, 2009Gm Global Technology Operations, Inc.Hinge device
US7654925Jul 10, 2006Feb 2, 2010Borgwarner Inc.Tension-reducing random sprocket
US7749117 *Feb 10, 2006Jul 6, 2010Rotor Components Technologies, S.L.Ovoid chainrings for optimising conventional pedaling
US8066602Dec 18, 2009Nov 29, 2011Borgwarner Inc.Tension-reducing random sprocket
US8430775Dec 26, 2007Apr 30, 2013Borgwarner Inc.Multiple tension reducing sprockets in a chain and sprocket system
US9005062 *Jul 5, 2011Apr 14, 2015Rotor Componentes Technologicos S.L.Attachment of an ovoid chainring
US9039553 *Mar 30, 2012May 26, 2015Tai-Her YangTreadle-drive eccentric wheel transmission wheel series with periodically varied speed ratio
US9169903 *Dec 18, 2012Oct 27, 2015Tai-Her YangTransmission wheel system series with periodically varied speed ratio and having reciprocally displacing auxiliary pulley for storing/releasing kinetic energy
US9243691 *Dec 18, 2012Jan 26, 2016Tai-Her YangNoncircular synchronous transmission pulley set having periodically varying speed ratio and circumference compensating function
US9255629 *Dec 17, 2013Feb 9, 2016Tai-Her YangTransmission wheel series with periodically varied speed ratio and having reciprocally displacing auxiliary pulley for storing/releasing kinetic energy
US9493211 *Nov 2, 2015Nov 15, 2016Sram, LlcChainring
US20020169043 *May 7, 2002Nov 14, 2002Chieh-I LiuElliptic gearing for a bicycle
US20030087714 *Nov 6, 2001May 8, 2003Borgwarner Inc.Tension-reducing random sprocket
US20060211529 *Feb 10, 2006Sep 21, 2006Rotor Componentes Tecnologicos S.IOvoid chainrings for optimising conventional pedaling
US20060240925 *Jul 10, 2006Oct 26, 2006Borgwarner Inc.Tension-Reducing Random Sprocket
US20070096503 *Feb 18, 2005May 3, 2007Daniel BorleisHinge device
US20070246908 *Apr 21, 2006Oct 25, 2007Ming-Tsan ShuChain wheel for bicycle
US20100151978 *Dec 18, 2009Jun 17, 2010Borgwarner, Inc.Tension-Reducing Random Sprocket
US20100167857 *Jun 20, 2007Jul 1, 2010Borgwarner Inc.Resonance tension reducing sprocket with combined radial variation and sprocket wrap
US20100292038 *Dec 26, 2007Nov 18, 2010Borgwarner Inc.Multiple Tension Reducing Sprockets in a Chain and Sprocket System
US20120252613 *Apr 15, 2011Oct 4, 2012Tai-Her YangTreadle-drive elliptical wheel transmission wheel series with periodically varied speed ratio
US20120252622 *Mar 30, 2012Oct 4, 2012Tai-Her YangTreadle-drive eccentric wheel transmission wheel series with periodically varied speed ratio
US20130130851 *Jan 15, 2013May 23, 2013Tai-Her YangTreadle-drive eccentric wheel transmission wheel series with periodically varied speed ratio
US20130281239 *Jul 5, 2011Oct 24, 2013Rotor Componentes Tecnologicos S.L.Attachment of an ovoid chainring
US20140171239 *Dec 18, 2012Jun 19, 2014Tai-Her YangTransmission Wheel System Series with Periodically Varied Speed Ratio and Having Reciprocally Displacing Auxiliary Pulley for Storing/Releasing Kinetic Energy
US20140171240 *Dec 18, 2012Jun 19, 2014Tai-Her YangNoncircular Synchronous Transmission Pulley Set Having Periodically Varying Speed Ratio and Circumference Compensating Function
US20140171241 *Dec 17, 2013Jun 19, 2014Tai-Her YangTransmission wheel series with periodically varied speed ratio and having reciprocally displacing auxiliary pulley for storing/releasing kinetic energy
US20150226293 *Apr 24, 2015Aug 13, 2015Tai-Her YangTreadle-drive eccentric wheel transmission wheel series with periodically varied speed ratio
US20160052596 *Nov 2, 2015Feb 25, 2016Sram, LlcChainring
US20160052597 *Nov 2, 2015Feb 25, 2016Sram, LlcChainring
US20160052599 *Nov 2, 2015Feb 25, 2016Sram, LlcChainring
US20160121966 *Jan 11, 2016May 5, 2016Sram, LlcChainring
WO2007003263A1Jun 16, 2006Jan 11, 2007Schaeffler KgContinuous belt drive
Classifications
Cooperative ClassificationF16H2035/003, B62M2009/002