Title of Invention

AN IMPROVED ROTARY DRIVE GEAR SYSTEM HAVING NO REAR FREE WHEEL FOR A BICYCLE

Abstract

An improved rotary drive gear system for a bicycle having no rear free wheel comprising a rotary drive gear, a rear hub chain gear and a communicating chain between rotary drive gear and rear hub gear. The roatary drive gear of specified diameter fastened to the drive axle comprising a central circular portion (1) having at least one pair free locks (3, 4) with lock lever of laterlal bisymmetry at the periphery and an outer annular portion (2) rotatable with the help of a ball-set (5) in a circular housing on the either side between the two portions, the outer annular body having number of interior lock teeth and a number of outer chain teeth (7), the rear hub gear of specified diameter fastened to right side of the hub (10) of the rear wheel having a number of chain teeth (9), the communicating chain (11) of adequate length connecting the rotary drive gear and the gear hub gear, characterized in that the rear hub gear connected with rotary drive gear through the communicating chain the speed ratio between drive gear and driven rear gear is 4.8 : 1 [ Fig. 3 ].

Full Text

BACKGROUND OF THE INVENTION : The rolling friction between the tyre and road surface at higher speed is less than that at the speed of an existing bicycle achieved by normal driving. A speedy drive device working at normal paddling provides to a rider the advantages of less frictional forces limited by air resistance and inertial of motion. Attempts have been made over many years to invent a gear system for a bicycle to improve the vehicle. The related inventions for examples - U.S. PAT. NO. - 4,938,733, titled - "Bicycle gear shifting method and apparatus", U.S.PAT. NO. - 4,592,738, titled - "Chain gear for a bicycle" etc. include mainly derailleur and a free wheel of multi chain gears. Such a derailleur mechanism for speed change of a bicycle involves unnecessary friction. These shifting drive devices as a whole are tedious in long riding, trouble some in machining, complex in construction and expensive to produce. Such a drive gear system can not solve the aforesaid problems. OBJECT OF THE INVENTION : The principal object of this invention is to drive a bicycle in higher speed comfortably with less dissipation of energy limited by air resistance. The another object of this invention is to provide fuelless, pollution free and pedal powered speedy Bi-cycle fit for a long journey. FIELD OF THE INVENTION : The invention relates to the drive gear system for a bicycle and constitutes a speedy and comfortable drive device for a bicycle. A SUMMARY OF THE INVENTION : The improved rotary drive gear system (Fig - 3) includes a rotary drive gear, a rear hub chain gear and a communicating chain. The rotary drive gear (Fig -1) consists a central circular portion attached to pedal shaft and an outer annular portion. The outer annular body of the rotary drive gear is provided with an even number of interior teeth and a number of outer chain teeth. At least one pair free locks are mounted in opposite sides on the periphery of the central circular body adjacent to the interior teeth of the outer annular body. The lateral bi-symmetry in structure and supporting is the particular characteristic of the lock lever. A ball set is arranged in circular housing on either side between the central and outer portions of the rotary drive gear. The rotation of the pedal attached to the central circular portion body in forward direction makes the two lock levers lock simultineously with the interior teeth of the outer annular body and hence drives the communicating chain but a reverse rotation or rest of paddling becomes free due to unlock of the said locks. The rear hub gear (Fig - 2) simplest in construction replaces the existing free wheel of a bicycle. The rear hub gear having a number of teeth is fastened on the right side of the hub of the rear wheel of a bicycle in the same vertical plane to that of the rotary drive gear fastened on the drive axle of the bicycle. A chain means for communicating rotational movement of the rear hub gear and hence the rotation of the rear wheel of a bicycle is connected between the rotary drive gear and the rear hub gear. The speed of a bicycle for given rear wheel and rate of Paddling depends on the ratio of the diameter of the drive gear to that of the free wheel. The speed increases with the increase of the speed ratio means the ratio of the diameter of the drive gear to that of the free wheel. In case of an existing bicycle the said speed ratio is about 2'4 but in case of the invention, the ratio is at least 48. Thus same rate of paddling applied to this invention yields at least double speed w.r.t that of the existing bicycle. BRIEF DESCRIPTION OF THE DRAWINGS : Fig. - 1 is a left side view of the rotary drive gear. I - The central circular portion. 2 - The outer annular portion 3, 4 - The two free locks. 5 - The ball sets. 6 - Pedal of the rotary drive gear. 7 - The chain teeth of outer annular portion 8 - The drive axle of a bicycle. Fig. - 2 is a left side view of the rear hub chain gear. 9 - Teeth of the rear hub chain gear. Fig. - 3 is a left side view of the whole of the improved rotary drive gear system for a bicycle. 10 - The hub of the rear wheel of a bicycle. II -The communicating Chain. DETAILED DESCRIPTION OF THE INVENTION : Figure.-1 shows left side view of the rotary drive gear. The rotary drive gear comprises a central circular portion (1) attached to the pedal shaft and an outer annular portion (2) having diameter about -18.7 cm. The outer annular body of the rotary drive gear is provided with an even number of interior lock teeth designed for locking and a number of chain teeth (7) at the periphery. At least one pair free locks (3, 4) are mounted in opposite sides on the periphery of the central circular body adjacent to the interior teeth of the outer body (2). The particular characteristic of lock lever is that it is lateral bi-symmetric in structure and supporting at both ends in a horrizontal hollow of its housing to enable the outer portion (2) of the drive gear rotate in circular motaion confined in vertical plane. A ball-set (5) is arranged in circular housing on the either side between the central circular and outer annular portions of the rotary drive gear. When the pedal (6) attached to the central circular body is rotated about the drive axle (8) in forward direction means in a direction similar to that of the advancing rotation of the rear wheel of the bicycle, the two levers of the two locks (3, 4) become locked with interior teeth of the outer annular body and hence drives the communicating chain (11). But when the rotation of the pedal means rotation of the central circular portion (1) is reversed or at rest there is unlocking and said rotational motion of the pedal becomes free. The rear hub gear (Fig.-2) replaces the existing free wheel of a bicycle. It is very simple in construction consisting mainly a number of chain teeth (9). The diameter of the rear hub chain gear measuring about 3.9 cm is about half the diameter of the rear hub existing free wheel on the hub of rear wheel of a bicycle. The rear hub chain gear is fastened on the right side of the hub (10) of the rear wheel of a bicycle in the same vertical plane to that of the rotary drive gear. A chain (11) of adequate length means for communicating rotational movement of the rear wheel is connected between the rotary drive gear and the rear hub chain gear. I claim :- 1. An improved rotary drive gear system for a bicycle having no rear free wheel comprising a rotary drive gear, a rear hub chain gear and a communicating chain between rotary drive gear and rear hub gear. The roatary drive gear of specified diameter fastened to the drive axle comprising a central circular portion (1) having at least one pair free locks (3, 4) with lock lever of laterlal bisymmetry at the periphery and an outer annular portion (2) rotatable with the help of a ball-set (5) in a circular housing on the either side between the two portions, the outer annular body having number of interior lock teeth and a number of outer chain teeth (7), the rear hub gear of specified diameter fastened to right side of the hub (10) of the rear wheel having a number of chain teeth (9), the communicating chain (11) of adequate length connecting the rotary drive gear and the gear hub gear, characterized in that the rear hub gear connected with rotary drive gear through the communicating chain the speed ratio between drive gear and driven rear gear is 4.8 : 1 2. An improved rotary drive gear system for a bicycle as claimed in claim 1 wherein the rotary drive gear drives the communicating chain in forward driving rotation being simultaneous locking of the bi-symmetric lock levers but the reverse driving rotation or rest of the pedal becomes free due to unlocking of the said pair lock levers. 3. An improved rotary drive gear system as claimed in claim 1 wherein the communicating chain communicating between the rotary drive gear and rear hub gear moves so long as the bicycle runs. (4) ABSTRACT, An improved rotary drive gear system for a bicycle having no rear free wheel comprising a rotary drive gear, a rear hub chain gear and a communicating chain between rotary drive gear and rear hub gear. The roatary drive gear of specified diameter fastened to the drive axle comprising a central circular portion (1) having at least one pair free locks (3, 4) with lock lever of laterlal bisymmetry at the periphery and an outer annular portion (2) rotatable with the help of a ball-set (5) in a circular housing on the either side between the two portions, the outer annular body having number of interior lock teeth and a number of outer chain teeth (7), the rear hub gear of specified diameter fastened to right side of the hub (10) of the rear wheel having a number of chain teeth (9), the communicating chain (11) of adequate length connecting the rotary drive gear and the gear hub gear, characterized in that the rear hub gear connected with rotary drive gear through the communicating chain the speed ratio between drive gear and driven rear gear is 4.8 : 1 [ Fig. 3 ].

Documents:

00304-kol-2008-abstract.pdf

00304-kol-2008-claims.pdf

00304-kol-2008-description complete.pdf

00304-kol-2008-drawings.pdf

00304-kol-2008-form 1.pdf

00304-kol-2008-form 2.pdf

00304-kol-2008-form 3.pdf

304-KOL-2008-(10-09-2013)-ABSTRACT.pdf

304-KOL-2008-(10-09-2013)-CLAIMS.pdf

304-KOL-2008-(10-09-2013)-CORRESPONDENCE.pdf

304-KOL-2008-(10-09-2013)-DESCRIPTION (COMPLETE).pdf

304-KOL-2008-(10-09-2013)-DRAWINGS.pdf

304-KOL-2008-(10-09-2013)-FORM-1.pdf

304-KOL-2008-(10-09-2013)-FORM-2.pdf

304-KOL-2008-(22-02-2012)-ABSTRACT.pdf

304-KOL-2008-(22-02-2012)-AMANDED CLAIMS.pdf

304-KOL-2008-(22-02-2012)-DESCRIPTION (COMPLETE).pdf

304-KOL-2008-(22-02-2012)-DRAWINGS.pdf

304-KOL-2008-(22-02-2012)-EXAMINATION REPORT REPLY RECIEVED.PDF

304-KOL-2008-(22-02-2012)-FORM 1.pdf

304-KOL-2008-(22-02-2012)-FORM 2.pdf

304-KOL-2008-(22-02-2012)-FORM 3.pdf

304-KOL-2008-CORRESPONDENCE-1.1.pdf

304-kol-2008-CORRESPONDENCE.pdf

304-KOL-2008-EXAMINATION REPORT-1.1.pdf

304-kol-2008-EXAMINATION REPORT.pdf

304-kol-2008-FORM 18-1.1.pdf

304-KOL-2008-FORM 18-1.2.pdf

304-kol-2008-form 18.pdf

304-KOL-2008-GRANTED-ABSTRACT.pdf

304-KOL-2008-GRANTED-CLAIMS.pdf

304-KOL-2008-GRANTED-DESCRIPTION (COMPLETE).pdf

304-KOL-2008-GRANTED-DRAWINGS.pdf

304-KOL-2008-GRANTED-FORM 1.pdf

304-KOL-2008-GRANTED-FORM 2.pdf

304-KOL-2008-GRANTED-FORM 3.pdf

304-KOL-2008-GRANTED-SPECIFICATION-COMPLETE.pdf

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