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Publication numberUS611170 A
Publication typeGrant
Publication dateSep 20, 1898
Filing dateNov 16, 1897
Publication numberUS 611170 A, US 611170A, US-A-611170, US611170 A, US611170A
InventorsJames Howard
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
James howard
US 611170 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Nu. 6ll,|70. Patented Sept. 20, I898. J. HOWARD.


(Application filed Nov. 16, 1897.)

(No Model.)




SPECIFICATION forming part of Letters Patent No. 611,170, dated September 20, 1898. Application filed November 16, 1897. $erial No. 658,752. on; model.) Patented in England April 10, 1897, No. 9,167.

To all whom it may concern: I

Be it known that 1, JAMES HOWARD, engineer, a subject of the Queen of Great Britain, residing at 2 Sandfield Terrace, Guildford, London, in the county of Surrey, England, have invented certain new and useful Improvements in Driving-Gears for Cycles or the Like, (for which I have obtained a patent in Great Britain, No. 9,167, dated April 10, 1897,) of which the following is a specification.

The invention relates to means for taking up the slack of drivingchains when used with elliptical chain-wheels, such slackness of the chain occurring when the longer axis of the ellipse is in a horizontal position.

In order that my said invention may be particularly described and ascertained, reference is hereby made to the accompanying drawings, in which similar letters of reference indicate corresponding parts.

- Figure 1 is a front elevation of an elliptical chain-wheel fitted with my improved means for taking up the slack of the chain, Fig. 2 is a sectional plan view of same. Figs. 3 and at are diagrams serving to illustrate the action of the improved apparatus.

According to my invention I provide a triangular oscillatory frame a, suitably mounted loosely on the boss I) of the elliptical chainwheel 0 or on the axle d in such a manner that the chain-wheel c and the axle d are free to revolve in bearings in. the crank-bracket e without causinga similar action on the frame a, which remains in position between forward and backward moving portions of the chain f, Figs. 3 and 4.

The frame a,which can oscillate on the boss I) of the chain-wheel, is provided with a small chain roller or wheel g, suitably mounted on ball-bearings, and is also provided with a short arm h, carrying a small chain-guide wheel g, also mounted on ballbearings. The short arm his pivoted to the frame a at i, the short arm h being controlled in its movement pin Z, fixed in the frame to within the by a coil-spring in the box 7:, which is-arranged to exert its power outward and against the under side of the chain, the construction beingsuch that the arm h, carrying the guidewheel g, can yield on the oscillatory frame a. The motion of the short arm is limited by a formed in the short arm h.

recess m, v

The elliptical wheel may be set at any antaken up, the spring also forcingthe arm hto assumeits relative position at all other. points of the revolution. The frame a also accommodates itself to the action of the small wheels g g.

I claim- I 1. The combination with an axle, and an elliptical wheel, of an oscillatory frame carrying two chain-guide wheels, one of which is yieldingly mounted thereupon, substantially L as described.

2. The combination with an axle, and an elliptical chain-wheel, of an oscillatory frame loosely mounted in operative relation to the chain-wheel and provided with a chain-guide wheel 9 and a pivoted spring-yielding arm h carryinga chain-guide wheel g, substantially as and for the purposes described.

Dated the 24th day of September, 1897.




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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
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US20110070986 *Sep 18, 2009Mar 24, 2011Gm Global Technology Operations, Inc.Drive Belt Tensioner for Motor Generator Unit
US20120252622 *Oct 4, 2012Tai-Her YangTreadle-drive eccentric wheel transmission wheel series with periodically varied speed ratio
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
US20150345597 *Dec 23, 2013Dec 3, 2015Litens Automotive PartnershipOrbital tensioner assembly
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US20160052599 *Nov 2, 2015Feb 25, 2016Sram, LlcChainring
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EP1906052A2 *Sep 21, 2007Apr 2, 2008Delphi Technologies, Inc.Load dependent belt tensioner
EP2080932A2 *Jan 15, 2009Jul 22, 2009Bayerische Motoren Werke AktiengesellschaftPower transmission tensioning device
WO1990002894A1 *Sep 7, 1989Mar 22, 1990Trustees Of Columbia UniversityNoncircular drive
International ClassificationF16H7/08, F16H7/12
Cooperative ClassificationF16H7/1281, F16H2007/081, F16H2007/0874, F16H2035/003, B62M2009/002
European ClassificationF16H7/12N4