# US 6,719,081 B2 · Electrical bicycle with steering control by biasing the body > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,719,081 B2 - Document ID: US6719081B2 - Status: Granted - Kind: B2 - Application number: 10/167,303 - Filed: 2002-06-12 - Published: 2003-12-18 - Granted: 2004-04-13 - Earliest claimed: 2002-06-12 - Assignees: Taiwan Bicycle Industry R&D Center - Inventors: Pen-Cuang Liao; Chih-Hung Liang; Chao-Ming Ko - Web page: https://patentgrep.com/patent/US6719081B2 ## CPC - B62M 6/65: with axle and driving shaft arranged coaxially - B60L 50/20: using propulsion power generated by humans or animals - B62K 21/00: Steering devices - B60L 2200/12: Bikes - B60L 2220/44: Wheel Hub motors, i.e. integrated in the wheel hub - B60L 2220/46: Wheel motors, i.e. motor connected to only one wheel - B60L 2240/24: Steering angle - B62M: RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR {SINGLE-TRACK} CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES (arrangements or mounting of transmissions in vehicles in general B60K; transmission elements per se F16) - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - B62K: CYCLES; CYCLE FRAMES; CYCLE STEERING DEVICES; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FOR CYCLES; CYCLE AXLE SUSPENSIONS; CYCLE SIDECARS, FORECARS, OR THE LIKE ## Abstract An electrical bicycle includes a front body unit, a rear body unit and a pivot coupler unit which couples the front body unit and the rear body unit. The coupler unit enables the front body unit to be turned relative to the rear body unit when the rider turns his or her body to shift his or her center of gravity. ## Claims ### Claim 1 An electrical bicycle comprising: a front body unit; a rear body unit; and a pivot coupler unit coupled between said front body unit and said rear body unit for enabling the rider to control the direction of steering by twisting the rider's body, said pivot coupler unit comprising, an inverted T-shaped bar disposed vertically, a bottom bracket fixedly transversely fastened to a bottom side of said T-bar, said bottom bracket having two ends fixedly connected to said rear body unit, a foot bar supported in said bottom bracket and protruded over two distal ends of said bottom bracket, a smoothly arched guard extended over the periphery of said T-shaped bar and fixedly fastened to said front body unit, with said pivot coupler unit for enabling said front body unit and said rear body unit to be biased relative to each other, and a seat assembly coupled to a top end of said T-shaped bar. ### Claim 2 (depends on 1) The electrical bicycle as claimed in claim 1, wherein when the center of gravity of the rider's body is at the electrical bicycle, said front body unit and said rear body unit are maintained aligned enabling the electrical bicycle to be moved forwardly in a straight line. ### Claim 3 (depends on 1) The electrical bicycle as claimed in claim 1, wherein when the rider's body is turned to shift the center of gravity to the right side of the electrical bicycle, said front body unit is turned rightwards relative to said rear body unit, thereby causing the electrical bicycle to turn right. ### Claim 4 (depends on 1) The electrical bicycle as claimed in claim 1, wherein when the body rider's body is turned to shift the center of gravity to the left side of the electrical bicycle, said front body unit is turned leftwards relative to said rear body unit, thereby causing the electrical bicycle to turn left. ### Claim 5 (depends on 1) The electrical bicycle as claimed in claim 1, wherein said front body unit comprises: two flat side frames connected in parallel, said flat side frames each having a front a front wheel coupling end, a top handlebar coupling end, and a rear coupling end respectively connected to two ends of said guard of said pivot coupler unit, a front wheel coupled between said flat side frames, said front wheel having a wheel axle connected between the front wheel coupling ends of said flat side frames, and a head assembly fastened to the top handlebar coupling ends of said flat side frames. ### Claim 6 (depends on 5) The electrical bicycles as claimed in claim 5, wherein said front body unit further comprises a fender connected between said flat side frames and spaced relative to said front wheel. ### Claim 7 (depends on 6) The electrical bicycle as claimed in claim 6, wherein said fender has an arched shape. ### Claim 8 (depends on 6) The electrical bicycle as claimed in claim 6, wherein said front body unit further comprises: a plurality of transverse rod members fixedly connected between said flat side frames at different elevations and equally spaced apart from of said front wheel to support said fender between said flat side frames. ### Claim 9 (depends on 5) The electrical bicycle as claimed in claim 5, wherein said front body unit further comprises: a bottom plate fixedly connected between said flat side frames at a bottom side and defining with said flat side frames and said guard of said pivot coupler unit a receiving chamber. ### Claim 10 (depends on 9) The electrical bicycle as claimed in claim 9, wherein said front body unit further comprises: a sliding cover plate coupled to said flat side frames at a top side and adapted for closing said receiving chamber. ### Claim 11 (depends on 5) The electrical bicycle as claimed in claim 5, wherein said head assembly of said front body unit comprises: a locating block fixedly connected between the top handlebar coupling ends of said flat side frames and arranged in parallel to said sliding cover plate, a head tube forwardly extended from said locating block, a handlebar stem fixedly connected to said head tube, and a handlebar transversely supported on said handlebar stem. ### Claim 12 (depends on 1) The electrical bicycle as claimed in claim 1, wherein said rear body unit comprises: a rear wheel, said rear wheel having a wheel axle and two rear forks bilaterally connected between the bottom bracket of said pivot coupler unit and the wheel axle of said rear wheel. ### Claim 13 (depends on 1) The electrical bicycle as claimed in claim 1 wherein said rear body unit comprises: a shock absorber which supports said seat assembly. ### Claim 14 (depends on 1) The electrical bicycle as claimed in claim 1, wherein said rear body unit comprises: an oblique support arm, said support arm having a lower front end connected to said T-shaped bar and an upper rear end, a seat tube fastened to the upper rear end of said support arm and a saddle supported on said seat tube. ### Claim 15 (depends on 14) The electrical bicycle as claimed in claim 14, wherein said shock absorber has a free end connected to a bottom side of said support arm.