in fig1 the vehicle 10 has a front 11 and a rear 12 . the vehicle may be any conventional style , including cars , vans , suvs , and trucks . because of differing body construction in conventional vehicles , the distance between the floor pan 13 and the bottom edge of the door opening is not the same in all vehicles . in the instant invention it is essential that the dock 14 clear the bottom edge of the vehicle door opening 15 . the mounting plate 16 may be made in various thicknesses or shims may be added between the floor pan 13 and the mounting plate 16 to arrive at the correct height . as shown in fig1 the arms 17 of the dock must be of sufficient length to extend through the door opening 15 and , at least , beyond the vehicle body to allow the chair to back onto the lift portion 19 on the dock . the mounting plate 16 should be mounted in the floor pan 13 so that the chair 18 may rotate from outside the vehicle through the door opening to a conventional seating arrangement as shown . since the floor pan is designed to support passengers and their seats , no major alteration of the vehicle construction is contemplated for installing this system . as shown in fig1 and 2 , the chair 18 is supported on four wheels , the wheels 20 , 21 , 22 and 23 are shown as located at the four corners of the chair . the set of wheels 20 , 21 on the left side of the chair are duplicated on the right side . the rear wheels of the chair may be powered , as illustrated by motor 24 on wheel 21 . of course , the front wheels or all four wheels could be powered by different layouts and gearing using one , two or more motors . wheel 21 is mounted by axle 25 on shaft 27 . each wheel is supported on an axle at the bottom of a vertical shaft 26 , 27 , and 28 . the vertical shafts extend and retract into vertical pylons 29 , 30 , and 31 with the axles as a stop . the shafts and pylons may be integral portions of a jack or other hydraulic , mechanical or electrical lift device ( not shown ) to vertically extend and retract the wheels . the lift devices may be individually powered , powered by pairs or all four may be powered by one engine . the front wheels 20 and 22 are steerable by rotating the shafts within the pylons . the steering may be accomplished by the controls 100 mounted on one of the arm rests , eg . a joystick or left and right buttons . the controls 100 also direct the raising and lowering of the wheels with up and down buttons or similar devices . the conveyor mechanism may also be commanded by the controls 100 . the lifting mechanism and conveyor may also be operated from controls in the vehicle , if desired . the dock 14 has a active conveyor mechanism 32 that cooperates with the lifting portion 19 to permit the occupant of the chair to enter and exit the vehicle without leaving the chair 18 . the conveyor mechanism 32 has a motor 33 mounted on a shaft 34 between the interior ends of the arms 17 . the shaft 34 carries drive wheels or sprockets 35 , 36 at each end adjacent to each arm 17 . the drive wheels move linked chains or flexible drive belts 37 , 38 which extend parallel with the arms 17 . another shaft 39 connects the exterior ends of the arms 17 and includes rotary drive mechanisms or sprockets 40 , 41 at each end of the shaft adjacent the exterior ends of the arms 17 . these drive mechanisms are connected with and powered by the chains or flexible drive belts 37 , 38 . the drive mechanisms 40 , 41 engage the lift portion 19 of the dock to raise and lower the chair relative to the arms 17 when the chair is in contact with the lift portion . drive mechanisms 140 and 141 also operate in reverse to displace the chair from the seating position in the vehicle to the exterior ends of the arms 17 . the drive mechanisms may be in the nature of gears , sprocket wheels or pinions and the lift portion 19 in the nature of channeled or slotted tracks or racks so that as the drive mechanisms are turned by the flexible belts or chains , the lift portion is translated or moved in response . the ends of the flexible drive lines are connected to stub shafts which extend from the arms 17 as illustrated by stub shaft 105 in fig2 . idler pulleys 106 are located between the stub shafts and the drives 35 and 36 . the idler pulleys 106 are attached to springs 107 which move the idler pulley as the flexible drive shortens to take up slack . the springs 107 are attached to the exterior ends of the arms . the arms 17 have a channel members 50 forming the upper margin , shown in fig3 - 5 . the channel members have a vertical web 52 with an upper flange 51 and a lower flange 53 extending outwardly on the same side and parallel to each other . the channel members 50 have a downwardly opening section 51 forming the exterior ends of the arms . support wheels mounted on the lifting portion roll in the channel members in contact with flanges 53 during movement of the lift portion 19 . the brackets 60 are movably mounted on the exterior ends of the arms 17 . the brackets have a horizontal edge with four support wheels that travel in the horizontal portion of the channels 50 . one set of these support wheels 61 and 62 is shown in fig3 - 5 . these wheels operate to allow horizontal movement of the lift portion 19 and the chair 18 to translate the chair from the interior of the vehicle to the exterior and vice versa . the stops 63 , one in each channel , prevent the brackets from separating from the arms 17 . the brackets 60 have a leading edge 64 that parallels the vertical members 90 of the lift portion 19 . the leading edge of each bracket has two sets of wheels 65 , 66 and 67 , 68 that contact opposite sides of a flange 92 on the vertical member 90 . the brackets allow the lift portion 19 to move vertically and prevents the lift portion from tipping as the chair is hoisted off the ground . the lift portion 19 , as shown in fig3 - 5 , is a l - shaped frame with vertical members 90 and horizontal members 91 . there are two such l - shaped frames spaced apart approximately the same distance as the arms 17 . the horizontal members 91 carry guide wheels 93 connected to each member by a bracket 94 . as the lift portion is moving vertically , the guide wheels engage the channel portions 54 , as shown in fig4 and 5 . as the guide wheels approach the horizontal channels , they engage wheels 95 which smooth the transition from vertical movement to horizontal movement of the lift portion 19 . the wheels 95 are rotatably mounted on the exterior ends of the arms 17 . as the wheeled chair engages the lift portion , the bottom surface 96 of the seat of the chair is above the arms 17 and the rear surface of the back of the seat contacts the vertical members of the lift portion 19 , as shown in fig6 . the arms 17 have inwardly extending pins 97 , 98 which are disposed under brackets 99 , as shown in fig7 . there is a duplicate set of pins on the other arm 17 . these pins are captured by the box brackets 99 as the chair is lowered to be supported by the lift portion 19 . movement of the handle 108 , as shown in fig8 will close the bottom of the box brackets 99 with a movable slide 109 . the movable slide 109 is connected to the handle 108 by a spring loaded lever mechanism 110 . by securing the chair to the lift portion with laterally spaced pins , tipping of the chair relative to the lift portion is prevented upon lifting the chair out of ground contact . in a loading scenario , as shown in fig1 the chair will initially be backed onto the lift portion using the powered wheels and steering mechanism . once in place , the chair will be lowered to contact the horizontal members of the lift portion . the handle will be operated to lock the pins in place securing the chair to the lift portion . the chair is lifted off the ground as the active conveyor mechanism 32 begins to move . the conveyor mechanism initially exerts a lifting force on the lifting portion . when the chair has reached the limit of vertical movement , the wheels may be retracted . of course , this may be done simultaneously with the movement of the chair . with the chair at the appropriate level in relation to the dock , the continued movement of the conveyor mechanism translates the chair horizontally along the arms 17 and into the vehicle until the outer drive mechanisms are near the forward edge of the seat . the turntable is then rotated to place the chair in the normal vehicle seating arrangement . with regard to fig8 - 9 , the lift porting 19 may be horizontally translated by a stopper 111 located on the inside of the arms 17 to engage the flexible conveyor system 32 . as the lift portion 19 reaches the limit of vertical travel , the stopper is moved into engagement with the drive by the bracket 60 the stopper provides a positive connection between the lift portion and the conveyor for horizontal movement in both directions . it is to be understood that while we have illustrated and described certain forms of my invention , it is not to be limited to the specific forms or arrangement of parts herein described and shown . it will be apparent to those skilled in the art that various changes may be made without departing from the scope of the invention and the invention is not to be considered limited to what is shown in the drawings and described in the specification .
a docking mechanism for mounting in a vehicle movably supports a separable chair . the docking mechanism has a turntable , fixed in the vehicle , carrying arms with an articulated lifting device to move the chair vertically and horizontally along the arms . in operation , the chair is maneuvered over the lifting device , outside the vehicle , and raised vertically then moved horizontally along the arms to a stowed position inside the vehicle . the chair has powered supporting wheels which are steerable and retractable for stowing . in this manner , an occupant of the chair may enter and exit a vehicle without leaving the chair .