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1. 发明授权

US3759111A High speed variable ratio pulley 失效
标题翻译：高速可变比率PULLEY
公开(公告)号：US3759111A
公开(公告)日：1973-09-18
申请号：US3759111D
申请日：1973-02-05
申请人： HOFFCO INC , HOFFCO INC
发明人： HOFF S , HOFF S
IPC分类号： F16H9/18 , F16H55/56 , F16H61/662 , F16H11/06
CPC分类号： F16H61/66227 , F16H55/563
摘要： Improved safety and operation is obtained in a high-speed variable ratio pulley having a movable pulley flange which is driven rotatively by torque transmitting engagement between fixed spider arms and drive posts adjacent the periphery of the movable pulley flange, and is thrust axially toward a fixed pulley flange by centrifugal cam levers acting between the movable pulley flange and the spider arms. The drive posts closely straddle the thrust line and are long enough to give clearance for the intended flange movement, and their ends are tied together by a tie plate and a ductile bell housing which also engage an outboard bearing to support the posts and movable pulley flange against tilting. Cam movement of the pulley flange is limited, in one case by providing the cam levers with hooked ends which stop their swing at a point short of thrusting the movable pulley flange into forceful abutment with the fixed pulley flange, and in another case by positioning the tie plate to move as a stop against the ends of the spider, substantially on the cam thrust line. For special applications, the spider is adjustably positioned to provide different cam locations and engaging speeds.
摘要翻译：在具有可动皮带轮法兰的高速可变比皮带轮中获得了改进的安全性和操作性，该可动皮带轮法兰通过固定的双臂臂与邻近可动皮带轮凸缘的周边的驱动柱之间的扭矩传递接合而被驱动而被驱动，并且被轴向推向固定的滑轮凸缘由作用在可动皮带轮法兰和蜘蛛臂之间的离心凸轮杆构成。驱动柱紧紧地跨越推力线并且足够长以为预期的凸缘运动提供间隙，并且它们的端部通过连接板和延性钟罩壳体连接在一起，该壳体还接合外侧轴承以支撑柱和可动滑轮凸缘反倾斜。滑轮凸缘的凸轮运动受到限制，在一种情况下，通过提供具有钩端的凸轮杆，该钩端在不能将可动滑轮凸缘推动到与固定滑轮法兰有力抵接的点处停止摆动，并且在另一种情况下，连接板以基本上在凸轮推力线上的方式移动，以阻止蜘蛛的端部。对于特殊应用，蜘蛛可调节地定位，以提供不同的凸轮位置和啮合速度。

2. 发明授权

US3747721A Mini bike drive kit 失效
标题翻译： MINI BIKE DRIVE KIT
公开(公告)号：US3747721A
公开(公告)日：1973-07-24
申请号：US3747721D
申请日：1971-09-13
申请人： HOFFCO INC
发明人： HOFF S
IPC分类号： B62M25/00 , F16H61/662 , B60K17/06
CPC分类号： F16H61/66227 , B62M25/00 , B62M2701/0046
摘要： A belt transmission kit for mini bikes and the like provides variable ratio drives with small offset between the belt plane and the drive chain. A mounting plate which bolts to the engine supports a jackshaft spaced from the crankshaft. Variable-width, asymmetric V-groove pulleys on the crankshaft and countershaft both have flat fixed pulley flanges on the inner side of the belt, close to the mounting plate, and movable pulley flanges on the outer side. This keeps the belt aligned in a plane close to the engine, and permits use of a drive sprocket and chain drive to the rear wheel in a plane only slightly offset from the belt, at the same side of the engine. The kit can be mounted on a direct-drive mini bike by removing the direct-drive sprocket, from the crankshaft, mounting the kit, and shortening the chain.

3. 发明授权

US3338361A Centrifugal clutch 失效
公开(公告)号：US3338361A
公开(公告)日：1967-08-29
申请号：US51028265
申请日：1965-11-29
申请人： HOFFCO INC
发明人： HOFF STEPHEN J
IPC分类号： F16D43/22
CPC分类号： F16D43/22

4. 发明授权

US3625079A Variable ratio mini bike drive 失效
标题翻译：可变比率微型自行车驱动
公开(公告)号：US3625079A
公开(公告)日：1971-12-07
申请号：US3625079D
申请日：1970-09-21
申请人： HOFFCO INC
发明人： HOFF STEPHEN J
IPC分类号： B62M25/00 , F16H61/662 , F16H55/52
CPC分类号： F16H61/66227 , B62M25/00 , B62M2701/0046
摘要： A VARIABLE-RATIO BELT DRIVE FOR MINI BIKES AND THE LIKE, RESPONSIVE TO BOTH ENGINE SPEED AND DRIVE TORQUE. A NORMALLY-OPEN, VARIABLE-WIDTH DRIVER PULLEY RESPONSIVE TO ENGINE SPEED IS CONNECTED BY A V-BELT TO A NORMALLYCLOSED VARIABLE-WIDTH DRIVEN PULLEY WHICH INITIALLY GIVES A HIGH-REDUCTION DRIVE RATIO, E.G., 3:1. ONE FLANGE OF THE DRIVEN PULLEY IS MOVABLE AND URGED TOWARD THE FIXED FLANGE BY LOW-ANGLE CAMS AND A TORSION SPRING. A MOVABLE FLANGE OF THE DRIVER PULLEY IS URGED TOWARD THE FIXED FLANGE THEREOF BY WEDGE WEIGHTS ACTING BETWEEN THE MOVABLE FLANGE AND A REACTION CONE, SO THAT INCREASED SPEED CLOSES THE DRIVER PULLEY AND EXERTS BELT TENSION TO OPEN THE DRIVEN PULLEY, WHICH LOWERS THE DRIVE RATIO. HIGH TORQUE CAUSES THE CAMS TO CLOSE THE DRIVEN PULLEY AND OVERCOME THE SPEED-RESPONSE CONTROL, HENCE TO INCREASE THE DRIVE RATIO TO HANDLE THE INCREASED TORQUE AT HIGH ENGINE SPEED.

5. 发明授权

US3581853A Two-speed motor-bike drive 失效
标题翻译：双速电动自行车驱动
公开(公告)号：US3581853A
公开(公告)日：1971-06-01
申请号：US3581853D
申请日：1969-04-21
申请人： HOFFCO INC
发明人： HOFF STEPHEN J
IPC分类号： B62M9/04 , B62M7/00 , F16H57/10 , F16D67/02
CPC分类号： B62M7/00 , B62M2701/0007
摘要： A two-speed chain transmission for minibikes, as original equipment or as a conversion kit. High- and low-speed sprockets on a jackshaft are chain driven at different speeds by high and low drive sprockets carried by a centrifugal clutch on the engine shaft. The jackshaft is chain connected to the rear wheel of the bike. The low speed driven sprocket is mounted on the jackshaft by an overrunning clutch which permits the jackshaft to overrun the low drive when it is driven by the high drive. The high-speed sprocket is mounted on the jackshaft by a clutch which is disengageable to let the low-speed drive takeover. A brake acts on the jackshaft on the driven side of the clutches.

6. 发明授权

US3059491A Saw chain drive sprocket 失效
标题翻译：锯链传动链轮
公开(公告)号：US3059491A
公开(公告)日：1962-10-23
申请号：US75446758
申请日：1958-08-11
申请人： HOFFCO INC
发明人： HOFF HARRY J , HOFF STEPHEN J
IPC分类号： B27B17/08
CPC分类号： B27B17/08 , Y10T74/19926 , Y10T74/19935 , Y10T83/707

7. 发明授权

US2888994A Cultivating implement 失效
标题翻译：培养工具
公开(公告)号：US2888994A
公开(公告)日：1959-06-02
申请号：US53885455
申请日：1955-10-06
申请人： HOFFCO INC
发明人： HOFF HARRY J , HOFF STEPHEN J
IPC分类号： A01B33/02
CPC分类号： A01B33/027

8. 发明授权

US3610062A Automatic mini-bike transmission 失效
标题翻译：自动微型自行车变速箱
公开(公告)号：US3610062A
公开(公告)日：1971-10-05
申请号：US3610062D
申请日：1969-12-03
申请人： HOFFCO INC
发明人： HOFF STEPHEN J
IPC分类号： B62M9/04 , B62M25/00 , F16D45/00 , F16H9/24 , F16H45/00 , F16D23/10 , F16H9/00
CPC分类号： F16H45/00 , B62M25/00 , B62M2701/0046 , F16D45/00 , F16H9/24
摘要： AN AUTOMATIC TWO-SPEED TRASMISSION FOR MINI-BIKE AND OTHER LIGHT-WEIGHT VEHICLES. A FIRST CENTRIFUGAL MAIN CLUTCH ON THE ENGINE SHAFT DRIVES PARALLEL CHAINS TO HIGHAND LOW-SPPED SPROCKETS ON A JACK SHAFT WHICH IS CHAINCONNECTED TO THE DRIVE-WHEE. THE LOW-SPEED SPROCKET DRIVES THE JACK SHAFT THROUGH A ONE-WAY, ROLLER "LOW" CLUTCH OF STUDY 4-ROLLER CONSTRUCTION, WHICH ALLOWS THE JACK SHAFT TO OVERRUN WHEN THE HIGH DRIVE ENGAGES. THE HIGH-SPEED SPROCKET DRIVES THE CLUTCH SHOES OF A SECOND CETRIFUGAL "HIGH" CLUTCH WHICH HAS ITS CLUTCH DRUM FIXED TO THE JACK SHAFT. THE HIGH-CLUTCH SHOES ARE PRIMARILY CENTRIFUGALLY RESPONSIVE, BUT ARE ARRANGED TO HAVE LIMITED SELF-ENRGIZING ACTION AND THEREBY TO MAINTAIN SMOOTH ENGAGEMENT AND RELEASE AS TRANSITION HANGES OCCUR DURING SHIFTS. THE COMBINATION GIVES RELIABLY PREDICTABLE SHIFTS IN RESPONSE TO DRIVE CONTROL OF ENGINE SPEED, AND SMOOTH TRANSITIONS BETWEEN LOW DRIVE AND HIGH DRIVE.

THE JACK SHAFT ASSEMBLY COMPRISES A CONTINUOUSLY SLOTTED SHAFT ON WHICH THE CLUTCHES, SPROCKETS, A BRAKE DRUM, AND SUPPORTING BEARINGS ARE MOUNTED IN AXIALLY ADJUSTABLE RELATION TO ADAPT SUCH ASSEMBLY FOR VERSATILE APPLICATION TO DIFFERENT BIKE STRUCTURES AND FOR USE AS A MODIFICATION KIT ON EXISTING BIKES.

9. 发明授权

US3493088A Latch and cam released coil clutch 失效
标题翻译：拉链和凸轮释放线圈离合器
公开(公告)号：US3493088A
公开(公告)日：1970-02-03
申请号：US3493088D
申请日：1968-02-23
申请人： HOFFCO INC
发明人： HOFF STEPHEN J
IPC分类号： A01D34/68 , F16D13/02 , F16D11/08 , A01D35/12
CPC分类号： A01D34/6812 , A01D2101/00 , F16D13/025

10. 发明授权

US3026980A Centrifugal clutch with controlled self-energizing action 失效
标题翻译：离心式离合器具有自动控制功能
公开(公告)号：US3026980A
公开(公告)日：1962-03-27
申请号：US78217058
申请日：1958-12-22
申请人： HOFFCO INC
发明人： HOFF STEPHEN J
IPC分类号： F16D43/18
CPC分类号： F16D43/18

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