the embodiments of the present disclosure described below are not intended to be exhaustive or to limit the disclosure to the precise forms disclosed in the following detailed description . rather , the embodiments are chosen and described so that others skilled in the art may appreciate and understand the principles and practices of the present disclosure . referring now to fig1 , a vehicle 100 adapted for transporting a mobility - challenged individual is shown . the vehicle can be a van , taxi , bus , or any other type of vehicle capable of transporting a mobility - challenged individual . in fig1 , a rear end of the vehicle 100 is shown having a powered lift - gate 102 capable of being electrically , hydraulically , mechanically , or manually raised or lowered . when raised , the lift - gate exposes an access opening 104 to the rear of the vehicle 100 . a ramp 106 is shown in a stowed position , i . e ., a vertical orientation with respect to a floor of the vehicle 100 . the ramp can be used to assist with transporting the mobility - challenged individual from a ground surface to a location inside of the vehicle . in fig2 , for example , one embodiment is shown of a ramp system 200 capable of being adapted in a vehicle 100 similar to the one in fig1 . here , the ramp system 200 includes a ramp 202 disposed in a stowed or vertical position . in this position , the ramp system 200 is capable of stowing a wheelchair 206 , for example . to do so , the ramp system 200 may include a partial enclosure or frame 204 that includes at least a front member 208 disposed towards a front 216 of the ramp system 200 , a rear member 228 disposed towards the rear 218 thereof , and a first side member 210 and a second side member 212 . the first side member 210 and second side member 212 may each be coupled to the front member 208 and rear member 228 to form the frame 204 . the frame 204 forms a cage - like structure that surrounds the wheelchair 206 when disposed inside of the vehicle 100 . each of the front member 208 , first side member 210 , second side member 212 , and rear member 228 can be formed of a robust material such as steel to offer protection to the wheelchair and , when occupied , to the occupant . each member can further include a flange 522 ( fig5 ) that defines a top surface 214 as shown in fig2 . in some embodiments , the vehicle floor may be redesigned to a location beneath its conventional location , i . e ., the floor level is lowered , so that a space is provided for the ramp system 200 to occupy inside the vehicle . in this embodiment , the top surface 214 of each of the front member 208 , first side member 210 , second side member 212 , and rear member 228 can be arranged substantially parallel or aligned with the conventional floor level inside the vehicle . with the vehicle floor being lowered to a new location , sufficient clearance is provided in the vehicle so that an occupant sitting in the wheelchair 206 can do so comfortably . as also shown , the ramp 202 of the ramp system 200 is shown in the vertical or stowed position . the ramp 202 can include a first side panel 224 and a second side panel 226 . each side panel extends in an approximately 90 ° angle with respect to a ramp surface 302 of the ramp 202 . as such , the side panels offer side support to the ramp 202 when a wheelchair 206 is being moved on and off the ramp 202 . the ramp 202 can also include a main handle 222 defined within its main surface 302 for use to manually manipulate the ramp 202 between positions . in addition , each of the first side panel 224 and the second side panel 226 may include a side handle 230 as well . while there are several handles depicted in the embodiment of fig2 , it is to be understood that in alternative embodiments the ramp 202 may be controlled electronically or otherwise such that the handles are unnecessary to manipulate the ramp 202 . moreover , in other embodiments , the ramp 202 may be manipulated manually or automatically , i . e ., there may be automatic means in the form of an electronic , hydraulic , mechanical , etc . mechanism to control positioning of the ramp 202 . referring to the embodiments of fig3 - 7 , the ramp system 202 is capable of being maneuvered in a plurality of orientations or positions . in fig3 , for example , the ramp 202 is disposed in a lowered position 300 . here , the ramp 202 may be pivoted about a pivot pin 304 that defines a pivot axis from the stowed position of fig2 to the lowered position 300 of fig3 . the pivot pin 304 is shown in greater detail in fig8 and will be described below . in the lowered position 300 , the ramp 202 can be configured at an angle with respect to a floor or pan 220 of the enclosure 204 . as described above , the frame 204 includes the front member 208 , first side member 210 , second side member 212 , and rear member 228 to partially surround or enclose the wheelchair 206 in the stowed position . in this position , the ramp 202 may be disposed in its lowered position 300 so that the wheelchair 206 may be moved along the ramp surface 302 and into the interior of the vehicle 100 . as the wheelchair 206 enters the interior of the vehicle 100 , it may be rolled or moved onto the floor 220 of the enclosure 204 . the floor 220 of the enclosure 204 may be in contact with the lowered vehicle floor ( not shown ). this , of course , is only the case when the vehicle floor is lowered from its conventional floor level . in those embodiments in which the vehicle floor is not lowered , the floor 220 may be in contact and rest above the vehicle floor at the conventional floor referring to fig5 , the pan 220 may be formed by a plurality of plates . for instance , the pan 220 may include a first plate 504 , a second plate 506 , and a third plate 508 . each plate may be secured or coupled to the vehicle floor via rivets or other fasteners 510 . in other embodiments , there may be additional or fewer plates that form the pan 220 . the inclusion of two or more plates allows the pan 220 to take the shape of an uneven surface . for instance , some of the mechanical components of the vehicle such as the driveline , rear axle , engine , transmission , exhaust system , etc . may require the vehicle floor to be uneven , i . e ., unparallel from front to rear of the vehicle . the additional plates form the pan 220 to take shape of this lowered floor of the vehicle . as also shown in the illustrated embodiment of fig3 , the first side panel 224 may include a first latch member 306 . likewise , the second side panel 226 may include a second latch member 308 . each latch member may be positioned along the respective side panel at a location between the pivot pin 304 and the side handle 230 . in addition , each latch member may be structured to define an opening for receiving a pin 310 when the ramp 202 is moved to the stowed position . in other words , the first latch member 306 may define an opening 514 ( see fig5 ) for receiving one pin 310 and the second latch member 308 may define a different opening 516 for receiving another pin 310 . in this embodiment , one pin 310 is coupled to the first side member 210 and the other pin 310 is coupled to the second side member 212 . both pins 310 are coupled to the respective side member towards the rear thereof , and at a location that is approximately vertically aligned with the pivot pin 304 of the ramp 202 . in the lowered position 300 , the ramp 202 may be pivoted about its pivot pin 304 so that the first latch member 306 comes into contact with one pin 310 and the second latch member 308 comes into contact with the other pin 310 . as shown , each latch member can form or define the respective opening therein by a pair of fingers that are structured like pinchers or claws . thus , as the latch member comes into contact with the pin 310 , the ramp 202 is pivoted about its pivot pin 304 an additional amount until the pin 310 becomes disposed within the respective opening . in this manner , the structure or design of each latch is such that when the pin 310 is engaged by each latch member , i . e ., disposed within the opening formed by the latch member , the latch member partly surrounds the pin 310 to hold or maintain the ramp 202 in the stowed position . in other words , an additional force may be required to position the pin 310 within the respective opening formed by each of the first latch member 306 and the second latch member 308 . referring to fig4 , the ramp 202 is disposed in its stowed position 400 . as previously described , the ramp 202 includes a ramp surface 302 . on the opposite side as the ramp surface 302 , the ramp 202 may include an underneath surface 408 upon which one or more pads 402 are coupled . the pads 402 may be formed of an elastic material or a plastic . other materials are also possible for the pads 402 . the pads 402 may protrude from the underneath surface 408 when the ramp 202 is in its lowered position 300 so that each pad 402 contacts a ground surface . in this manner , the pads 402 offer support to the ramp 202 . the pads 402 may be secured to the ramp 202 via one or more fasteners 512 ( see fig5 ). in fig4 , the rear member 228 is shown being positioned in an open position . the rear member 228 is capable of moving between this open position and a closed position , e . g ., see fig7 . the ramp 202 and rear member 228 are independently coupled to the ramp system 200 , and thus each is capable of being moved independently from the other . when the rear member is in the open position , for example , it is possible to maneuver or position the ramp 202 in any one of three positions . for instance , the ramp 202 may be disposed in a raised or stored position 600 ( i . e ., see fig6 ), the lowered or deployed position 300 ( i . e ., see fig3 and 5 ), and the stowed position 400 ( i . e ., see fig4 ). in the closed position , however , the ramp 202 can only be maneuvered or positioned in its raised position or stowed position , i . e ., the ramp 202 cannot be moved to its lowered or deployed position with the rear member 228 in the closed position . the rear member 228 can pivot about a pivot point 406 as shown in fig4 . moreover , the rear member 228 may be coupled to the floor 220 of the enclosure 204 via a plurality of hinges 404 to allow for the pivotal movement . the pivot point 406 of the rear member 228 may be different from the pivot pin 304 of the ramp 202 , such that the ramp 202 and rear member 228 are independent from one another . in other words , the rear member 228 may be pivoted between its open and closed position independently from the ramp 202 , and similarly the ramp 202 may be pivoted between its raised position , lowered position , and stowed position independently of the rear member 228 . this may be possible with the ramp 202 and rear member 228 not being coupled directly to one another . in many conventional ramp systems , a conventional ramp is directly coupled to a rear tailgate structure such that both pivot in unison with one another . referring now to fig5 , the ramp system is shown with the ramp 202 . in its lowered position 300 and the rear member 228 in its open position . in order to reach its lowered position , the ramp 202 can be in a sliding engagement or slidably coupled to a track system . as shown , a longitudinally - extending track 500 is coupled to the second side member 212 . likewise , another track ( not shown ) is coupled to the first side member 210 in a way such that both tracks 500 are in approximate alignment with one another . each track 500 defines a guide channel 502 . the guide channel 502 may include a first end 518 and a second end 520 . the first end 518 may be positioned near a front 216 of the ramp system 200 , whereas the second end 520 may be positioned near a rear 218 thereof . the ramp 202 may move through the guide channel 502 between the first end 518 and the second end 520 , such that at the first end 518 the ramp 202 is disposed in its raised position and at the second end 520 the ramp 202 is disposed at its lowered position . this is further shown in fig8 and 9 . in fig8 , for example , the manner in which the second side panel 226 of the ramp 202 is coupled to the track 500 is shown . here , the second side panel 226 includes a curved end 836 this is located at or near the pivot location of the ramp 202 . as described above , the ramp 202 may pivot about a pivot pin 304 . in fig8 , the pivot pin 304 is shown as being formed by a pin 816 that is inserted through a correspondingly defined hole 818 in the curved end 836 of the side panel 226 . the hole 818 is shaped as a key - like slot capable of receiving a key 830 . the key 830 protrudes from a cap 828 that is positioned on a side opposite the track 500 from the side panel 226 . the cap 828 has an annular cross - section as shown in fig9 . moreover , the key 830 includes a threaded opening which may receive the pin 816 in a threaded engagement . in this embodiment , a washer or bushing 820 may be positioned between an outer wall of the side panel 226 and an inner wall of the track 500 . the pin 816 may pass through the hole 818 defined in the side panel 226 and a corresponding opening defined in the washer or bushing 820 . in addition , the key 830 may pass through an opening defined in a second washer or bushing 826 . the second washer or bushing 826 may be positioned in contact with an outer wall of the track 500 . as shown best in fig9 , the key 830 may pass through the guide channel 502 for coupling to the pin 816 . as such , the pin 816 may be tightened in threaded engagement with the key 830 . the engagement of the key 830 and pin 816 may move or slide within the guide channel 502 between its first end 518 and its second end 520 to allow the ramp 202 to move between its raised and lowered positions . in the lowered position , the cap 828 may be received within an opening 834 defined within a coupler 832 . the coupler 832 includes a main body with a through - hole defined therein . a screw or other fastener 822 may pass through a corresponding opening 824 in the track 500 and be coupled to the coupler 832 via the through - hole . for example , the screw or fastener 822 may be threadedly engaged with the through - hole in the coupler 832 to secure the coupler 832 and track 500 to one another . as also shown , the second side member 212 may include an opening or through - hole 808 for receiving the screw or fastener 822 as well . thus , the track 500 and coupler 832 may be coupled to the second side member 212 . at the opposite end of the track 500 , i . e ., near the front 216 or first end 518 of the guide channel 502 , another coupler 806 may be provided . this coupler 806 may be shaped similarly to the coupler 832 previously described , i . e ., having an opening 810 capable of receiving the cap 828 . a screw or fastener 802 may secure the track 500 via an opening 804 and coupler 806 to the second side member 212 via hole 808 as shown . the second side member 212 may include a plurality of holes 808 such that the track 500 may be secured at two or more locations along its longitudinal length . in fig8 , for example , another screw or fastener 812 is shown capable of being inserted through a hole 814 defined in the track 500 at some location between the two ends thereof . the screw or fastener 812 may be coupled to one of the plurality of holes 808 in the second side member 212 as shown . referring to the cross - section 900 of fig9 , the pin 816 is shown being coupled to the key 830 and cap 828 . the pin 816 is positioned within the guide channel 502 at a location between the first and second ends . in the location shown in fig9 , the cap 828 is coupled or “ snapped ” into engagement with the second coupler 832 . each of the first coupler 806 and second coupler 832 are structurally designed to include an opening or open end capable of receiving the cap 828 . in the raised position , the ramp 202 can be pushed toward the front 816 of the vehicle 100 until the cap 828 enters and is received in the open end 810 of the first coupler 806 . in one example , the engagement between the first coupler 806 and the cap 828 may be a snap - fit engagement . once engaged , the ramp 202 may rotate or pivot about its pivot location 304 , but the coupler 806 is capable of retaining the cap 828 from sliding or moving within the guide channel 502 . likewise , the second coupler 832 is structured similar to the first coupler 806 for receiving the cap 828 . the second coupler 832 also includes an open end or opening 834 for receiving the cap 828 . an engagement between the cap 828 and second coupler 832 may be a snap - fit engagement , for example . other types of engagement between the cap 828 and the first and second couplers is also possible , e . g ., a latching engagement between a slide - bolt and latch opening . in any event , the ramp 202 may freely rotate or pivot about the pivot location 304 while retained or coupled to the first and second couplers . moreover , when the cap 828 is coupled to the second coupler 832 , the ramp 202 may be pivoted between its stowed position and lowered position . the ramp 202 may not pivot any further than its stowed position due to the engagement of the first and second latch members 306 , 308 with the pins 310 . as shown further in fig8 , each pin 310 may be coupled to its respective side member via a screw , bolt , or other fastener 800 . while the embodiments of fig5 - 8 only show one track 500 coupled to the second side member 212 , a similar track 500 is coupled to the first side member 210 . a first coupler 806 and a second coupler 832 may also be coupled to the first side member 210 as well to enable the ramp 202 to move within the guide channels 502 of both tracks 500 in a sliding manner . as shown in fig1 , the ramp 202 is configured in its raised position and the rear member 828 is disposed in its closed position . here , a cross - section of the aforementioned pad 402 is shown . the pad 402 can be fastened to the ramp 202 via a screw or fastener 512 as previously described . the pad 402 can isolate the ramp 202 from the pan 220 to thereby reduce rattle or other noise during vehicle operation . in some embodiments , the pad 402 may also contact the ground surface when the ramp is disposed in its lowered position , although this is not the case in all embodiments . as also shown , a wheelchair tie down restraint 1000 may be provided . a rear belt retractor may couple to the restraint 1000 . in some embodiments , this may not be present . a rear weather strip seal 1002 is also shown in fig1 . this feature may be optional in some embodiments . the ramp system 200 described above and shown in the accompanying drawings provides for a less complicated mechanism than other conventional ramp systems . in addition , this ramp system 200 allows for additional storage space when the ramp system is designed for a rear or side access to a vehicle . while the accompanying drawings illustrate the ramp system 200 for a rear access vehicle , it is within the scope of this disclosure that the ramp system 200 may be designed for a side access vehicle as well . in any event , luggage and other items may be stowed in the rear or side of the vehicle , and the ramp 202 does not obstruct or prevent items from being stowed as in many conventional ramp systems . moreover , the ramp 202 is capable of being retracted from its raised position to its lowered position , or pivoted between its lowered and stowed positions in an easier manner than many conventional ramp systems . the ramp system 200 is coupled to the vehicle , but the ramp 202 is independent from the rear member 228 . thus , the ramp 202 is easy to maneuver between positions as needed . the ramp system 200 may be welded or otherwise coupled to the vehicle to add rigidity and security to the overall system . in some embodiments , the vehicle floor may be dropped or lowered by up to 14 ″ from its conventional floor level in order to accommodate the ramp system 200 . in some embodiments , a latching mechanism in the form of a slide bolt may be used to secure the ramp 202 in the stowed position rather than the engagement of the latch members and pins 310 . one skilled in the art may appreciate other mechanisms that can be used to secure or couple the ramp 202 in the stowed position . attached hereto is an appendix which includes additional features and embodiments of the present disclosure . among these features is a slotted opening formed in the tracks 500 to allow the ramp 202 to be removably coupled thereto . the slotted opening may he angled and a top portion of the coupler may limit movement of the ramp 202 out of engagement with the track . thus , the ramp 202 may be shifted laterally or lifted at an angle to become disengaged from the track 500 via the slotted opening . while exemplary embodiments incorporating the principles of the present disclosure have been disclosed hereinabove , the present disclosure is not limited to the disclosed embodiments . instead , this application is intended to cover any variations , uses , or adaptations of the disclosure using its general principles . further , this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this disclosure pertains and which fall within the limits of the appended claims .
a retractable ramp system for facilitating mobility - challenged individual &# 39 ; s entrance to and exit from a structure , particularly , from a motorized vehicle . the ramp system includes a frame having a front member , a first side member , a second side member , a rear member , and a floor . the rear member is pivotally coupled to the frame between an open position and a closed position . the ramp system includes a first track coupled to the first side member and defining a longitudinal channel therein , and a second track coupled to the second side member and defining a longitudinal channel therein . a ramp is pivotably coupled to the first and second tracks about a pivot axis , and includes a ramp floor , a first side panel , and a second side panel . the system includes a latch to maintain the ramp in a stowed positon .