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| Number | Title | Issue Date |
| 4953652 | Four-wheel steering system for motor vehicle A four-wheel steering system for motor vehicle including a front wheel steering mechanism for steering front wheels in response to a steering wheel, a rear wheel steering mechanism in accordance with the movement of the front wheels, control unit having d... | 09/04/1990 |
| 4944358 | Driving wheel slip control system for vehicles A driving wheel slip control system for a vehicle equipped with an internal combustion engine, in which a decelerating condition of the engine is detected, a slip state of the driving wheels is detected, and the torque of the driving wheels is reduced in ... | 07/31/1990 |
| 4923204 | Adjustable king pin assembly An adjustable king pin assembly for releasably mating with a fifth wheel assembly on a tractor-trailer arrangement. The king pin is secured to a plate which plate is slidably positioned for longitudinal movement with respect to the frame of the trailer in... | 05/08/1990 |
| 4923203 | Composite bicycle frame with crossed tubular portions A generally hollow bicycle frame of resin impregnated fibrous material having a main tubular portion and a cross tubular portion arranged in an X-shaped geometry as viewed from one side. A rear segment of the main portion may be slit to provide opposing r... | 05/08/1990 |
| 4917406 | Length-adjustable holding device for the lower steering arm of a three-point coupling device The invention relates to a length-adjustable holding device (5) for supporting the lower steering arms of a three-point coupling device of an agricultural tractor. The holding device (5) comprises a helical spring (6) and an adjusting member (9). The spri... | 04/17/1990 |
| 4917209 | Motorcycle A motorcycle has a frame assembly including a main frame supporting front and rear wheels on a central line thereof. A connecting means mounted on the main frame between the front and rear wheels, and a subframe is mounted on the connecting member and bei... | 04/17/1990 |
| 4915403 | Skateboard with mechanical drive A skateboard has a frame (1) on which a petal (7b) is pivotably mounted. When the pedal (7b) is pressed down its movement is converted via a push rod (16), a crank (26) and a toothed segment (29) into a rotational movement which is transmitted to a gear t... | 04/10/1990 |
| 4915185 | Portable aircraft moving device A portable aircraft moving device comprising a portable electric drill containing a drive shaft extending from the drill output shaft to a worm gear reducer having an output shaft connected to a drive wheel that is mounted temporarily to the front wheel o... | 04/10/1990 |
| 4915190 | Control system for split axle drive mechanism in part-time four-wheel drive vehicle In a part-time four-wheel drive vehicle equipped with a transfer device adapted to change the operating mode of the vehicle drive system from a two-wheel drive mode to a four-wheel drive mode in response to engagement of a hydraulically operated clutch me... | 04/10/1990 |
| 4911459 | Launcher/retriever cradle for trailered boats A cradle, having positive buoyancy, and wheels, at the stern, is launched and recovered by a push/pull rod assembly pivotally attached to the forward portion of the cradle platform. Cabling, looping a double pulley forward and a single roller assemble pul... | 03/27/1990 |
| 4911260 | Four-wheel drive vehicle A four-wheel drive vehicle has an engine output shaft; a transmission having an input shaft connected to the output shaft and an output shaft connected through a transmission mechanism to the input shaft; a drive gear meshed with an output gear connected ... | 03/27/1990 |
| 4911458 | Folding bicycle An improved folding bicycle comprising a folding hinge mechanism as well as a set of foldable handle-bar and a collapsible seat structure. During normal use, the folding hinge mechanism is easily associated with multi-securing effect to ensure the safety ... | 03/27/1990 |
| 4909343 | Electric power steering system A hydraulic power steering system is disclosed which has a steering control valve operatively connected to a steering shaft to be actuated by the torsional torque exerted thereon by a steering wheel, and a hydraulic cylinder operated by the control valve ... | 03/20/1990 |
| 4909342 | Four wheel steering system A closed hydraulic system (22 or 200) is provided for transmitting steering movement to a rear wheel steering assembly (16) in response to steering movement of a front wheel steering assembly (14). The front wheel steering assembly is controlled by a stee... | 03/20/1990 |
| 4909344 | Arrangement for the drive of a motor vehicle In order to be able to use a four-wheel drive of a motor vehicle for different vehicle types without significant changes, it is combined into a compact drive unit. For that purpose, a four-wheel-locking mechanism and a free-wheel device with by-pass clutc... | 03/20/1990 |
| 4905781 | Water skate A fluid-cushion-supported pallet or water skate in which the cushion-fluid is generally defined by a multi-part or segmental, flexible skirt, in which the contiguous skirt members have their downwardly and inwardly extending lateral portions flanked by ti... | 03/06/1990 |
| 4906012 | Self-propelled quadrupedal toy The present invention is related to a self-propelled quadrupedal toy and, more particularly to a quadrupedal toy (toy horse, dog or deer etc.) having a driving mechanism equipped with two protruding handlebars for the rider (children) to operate to let th... | 03/06/1990 |
| 4905783 | Vehicular controller with differential wheel speed input A vehicular control with differential wheel speed input senses and operates with differential rotation of wheel speeds and uses information obtained from individual wheel speed sensors to control steering and/or suspension systems of a vehicle.... | 03/06/1990 |
| 4905784 | Power-assisted steering system for automotive vehicle A power-assisted steering system includes a changeover valve unit comprising an input member arranged to be applied with the driver's steering effort and a valve assembly disposed between a hydraulic pump and a hydraulic power cylinder to control the supp... | 03/06/1990 |
| 4902029 | Wheelchair with luggage carrier A wheelchair and carrier for a disabled person having a seat and back, and wheels, a carrier integrally formed with the wheelchair extending rearwardly at the back of the seat and back, support wheels on the carrier for supporting the weight of items on t... | 02/20/1990 |
| 4900051 | Boat trailer frame assembly A trailer for hauling a boat having a wheel and axle supported frame including a pair of frame members extended rearwardly from a tongue connection in a laterally spaced relationship, a cross member assembly supported on upper surfaces of the frame member... | 02/13/1990 |
| 4900045 | Alternative bicycle drive device An alternative drive device for a bicycle comprising a drive wheel assembly having two drive shafts and a drive wheel with dual rachet assemblies therein; vertical frame for mounting the drive wheel assembly in frictional engagement with the bicycle front... | 02/13/1990 |
| 4899841 | Leveling assembly for a work vehicle The present invention is directed to a leveling assembly for a work vehicle. The leveling assembly comprises upper and lower plates that are pivotally connected to one another about a horizontal axis. Two trunnion mounted hydraulic cylinders are mounted t... | 02/13/1990 |
| 4898258 | Electric power steering apparatus An electric power steering apparatus includes a torsion bar, input and output shafts, an electric motor, and a detecting mechanism. The input and output shafts are coupled to each other by the torsion bar so as to be pivotally displaced in relation to eac... | 02/06/1990 |
| 4896739 | Four-wheel drive vehicle A four-wheel drive vehicle has a front wheel side having a front wheel set, a rear wheel side having a rear wheel set, an engine having an output shaft extending in a transverse direction of a vehicular body, a transmission having an input shaft connected... | 01/30/1990 |
| 4895387 | Semi-submersible trailer for transporting boats A trailer for transporting boats is provided with an automatic centering structure having a pair of equal-length centering cables each having a first exterior end connected to a forward interior portion of the trailer frame, and a second interior end coup... | 01/23/1990 |
| 4893883 | Belt tension control system Hydraulic recoil mechanisms are useful, for example, in maintaining desired tension in the drive belts of vehicles. The hydraulic components of such mechanisms are prone to leakage over an extended period of frictionally driven belted non-usage and thereb... | 01/16/1990 |
| 4890852 | Tow mechanism for vehicles A tow mechanism for vehicles including a frame having front and rear ends, a platform at the front end for supporting the front wheels of a towed vehicle, a pair of cables at the rear end of the frame adapted to be secured to the towed vehicle rear end, a... | 01/02/1990 |
| 4889204 | Drive force distribution control system for four-wheel drive motor vehicle A drive force distribution control system in a four-wheel drive motor vehicle for distributing drive forces from an engine of the motor vehicle to first and second wheels of the motor vehicle includes drive force distributing means for distributing and tr... | 12/26/1989 |
| 4889206 | Viscous shear coupling A viscous shear coupling has housing and hub parts (20 and 22) with interleaved sets of plates (35, 36, 37), the set of plates carried by the housing part being in two sub-sets (35 and 36), the plates (36) of one sub-set being rotationally fast with the h... | 12/26/1989 |
| 4887688 | Motorcycle A motorcycle having a swingable front frame, a stable, non-swingable main frame, a front cowling supported by the main frame and covering a forward part of the motorcycle and an extension projecting laterally outwardly from each side of the front cowling.... | 12/19/1989 |
| 4887683 | Rack and pinion steering gear with intermediate take-off An apparatus for steering a vehicle having a longitudinal central axis. The apparatus comprises a pinion gear and a rack member in meshing engagement with the pinion gear. The rack member is movable in a path extending transverse to the longitudinal centr... | 12/19/1989 |
| 4887686 | Working vehicle A working vehicle comprising a vehicle body having a pair of front wheels and a pair of rear wheels, at least the rear wheels being drivingly rotatable and steerable, a working machine provided at the front end of the vehicle body, and a steering wheel an... | 12/19/1989 |
| 4887829 | Rear wheel suspension system for a tricycle vehicle A three wheeled vehicle having one front wheel and two rear wheels. The front wheel is for steering. Each rear wheel is rotatably mounted to a swing arm means. The two swing arms are pivotably mounted to the frame. The swing arms are connected to each oth... | 12/19/1989 |
| 4887827 | Bicycle safety turning device A bicycle safety turning device for installation upon a bicycle frame lower cross bar adapted to be engaged by the bicycle front wheel fork shoulder to limit the front fork from turning so far to the left or right as to be at a right angle to the forward ... | 12/19/1989 |
| 4887830 | Wheelchair with combined wheel lock and hill holder A wheel chair (A) has at least one wheel (50) rotatably mounted to a side frame (14). A combined wheel lock and hill holder assembly (D) is mounted adjacent an outermost peripheral surface of a tire (60) mounted to a rim (58) of the wheel. The wheel lock ... | 12/19/1989 |
| 4884650 | Slip detecting system for a four-wheel drive motor vehicle A system for detecting a slip for four wheels of a four-wheel drive motor vehicle has a speed difference detector for detecting the difference between the front-wheel speed and the rear-wheel speed and for producing a speed difference signal when the diff... | 12/05/1989 |
| 4883138 | Four-wheel drive vehicle operating system An operating system used in a vehicle equipped with a part-time four-wheel drive comprises; a center-differential shiftable between at least a two-wheel drive mode and a four-wheel differential-locked drive mode; a free-wheeling device with a clutch mecha... | 11/28/1989 |
| 4877260 | Anti-tip wheelchair accessory A wheelchair anti-tip mechanism including an adjustable base that is bolted to the lower frame of a wheelchair inside of the wheels and below the center of gravity. Telescoping legs are placable into the sides and rear of the base in an outrigged fashion ... | 10/31/1989 |
| 4875701 | Boat trailer hull and keel supporting assembly A boat trailer having a frame, a wheel unit supporting the frame, a rear cross member between elements of the frame for supporting a plurality of roller units, and a front cross member between other elements of the frame for supporting a hull supporting u... | 10/24/1989 |
