Material or article handling – Self-loading or unloading vehicles – Conveyor
Reexamination Certificate
1999-11-16
2001-05-29
Keenan, James W. (Department: 3652)
Material or article handling
Self-loading or unloading vehicles
Conveyor
C414S921000
Reexamination Certificate
active
06238168
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates generally to retractable ramp platforms that facilitate boarding of a passenger onto a vehicle and, in particular, retractable ramp platforms that facilitate access to a low floor vehicle.
BACKGROUND OF THE INVENTION
Intra-city buses have included wheelchair lifts for transporting persons of limited mobility in and out of the vehicles. Typically, a prior art wheelchair lift included a mechanically driven platform to raise and lower a passenger between loading from outside of the vehicle at ground level and entry into the vehicle at a vehicle floor level. For example, wheelchair lifts of the type installed in the stairwell of transit vehicles, such as intra-city buses, have been used for some time. One type of prior art wheelchair lift, commonly referred to as a “step lift” was disclosed in U.S. Pat. No. 4,466,771 to Thorley et al. The step lift in Thorley et al. was designed to be installed in the stairwell of a transit vehicle, and included hinged panels that were movable between a step configuration and a platform configuration. In the step configuration, the hinged panels formed steps for use by passengers to board and exit the vehicle. In the platform configuration, the hinged panels formed a horizontal platform used to raise and lower a wheelchair passenger between a vehicle floor-level position and a ground-level position.
Municipalities recently began using “low floor buses.” In this style of bus, a passenger entered the bus at a level that was above ground by a sufficient amount so that the chassis had proper ground clearance. The floor of the bus throughout the vehicle was substantially at this level. It was believed that such buses were more stable in operation, and permitted simpler egress and ingress of passengers.
A problem encountered with the low floor buses was that wheelchair lifts such as were disclosed in Thorley et al. could not be installed in the buses because there was not a stairwell. Moreover, the low floor buses lacked sufficient under-chassis space to mount the complex lifting mechanisms for a wheelchair lift. Therefore, other systems had to be developed to accommodate wheelchair users and other passengers of limited mobility. To address these concerns, some manufacturers developed ramp assemblies for providing limited mobility passengers access into and out of the low floor buses. The ramp assemblies were structures that selectively provided a ramp platform that extended between the outside ground and the floor of a vehicle such as an intra-city bus to provide access into and out of the vehicle.
Prior art ramp assemblies typically stowed the ramp platform under the vehicles when not in use, and deployed the ramp platform when it was necessary to provide passenger access. When the ramp platform was deployed, the two ends were positioned at different heights, creating a slope upward from the ground to the bus floor. An example of a ramp assembly for use in a low floor bus was disclosed in U.S. Pat. No. 5,636,399 to Tremblay et al. A similar ramp assembly for use in a van was disclosed in U.S. Pat. No. 5,393,192 to Hall et al.
One of the problems found in designing prior art ramp assemblies for low floor vehicles was the limited amount of space allotted for the ramp platform and its reciprocating mechanism, including the motor and necessary drive mechanism. Because the low floor buses lacked a stairwell and a raised floor under which the ramp assembly could be mounted, the designer was forced to minimize size in all dimensions to prevent loss of ground clearance or interference with other under-chassis structures. Tremblay et al. and Hall et al. addressed this problem by providing a compact ramp assembly. However, while the ramp assemblies disclosed in Tremblay et al. and Hall et al. were relatively small, the motors used for the ramps were mounted behind or underneath the frame for the ramp assembly, requiring additional installation area underneath the vehicle. There exists a need for a more efficient manner of mounting a motor for a ramp assembly.
Another problem with the prior art ramp assemblies was that the ramp platform was stowed several inches below the floor level and, to reach the deployed position, had to be raised to extend between the floor and the ground. Alternatively, some form of transition between the ramp in the deployed position and the floor had to be provided. Tremblay et al. addressed this problem by providing a hinged panel that formed a transition between the floor and the ramp platform. Hall et al., on the other hand, provided a complex tilting mechanism utilizing a reciprocating motor to lift the trailing end of the ramp to floor level. There is a need for a less complex mechanism for providing a transition between the floor and a ramp platform.
Another problem with prior art ramp assemblies is that, if power was cut to the reciprocating mechanism for the ramp platform, the ramp platform may be stuck in a deployed position. In such case, the driver of the bus would have to wait for maintenance crews to repair, or at least stow, the ramp platform. There is a need for a more simple way of retracting a ramp platform when the reciprocating mechanism for the ramp platform is inoperable.
SUMMARY OF THE INVENTION
In accordance with the present invention, a ramp assembly is provided. The ramp assembly includes a frame, a ramp platform, and first and second locking mechanisms. The ramp platform is mounted in the frame defining trailing and forward ends and is extendible and retractable along a length of the frame between a stowed and a deployed position. The ramp platform is arranged when deployed, such that the forward end extends down towards the ground. The first locking mechanism locks the ramp platform into a fully deployed position, wherein the second locking mechanism locks the ramp platform into a fully stowed position. The ramp assembly further includes a manual release mechanism, the actuation of which releases the first locking mechanism when the ramp assembly is in the fully deployed position. The manual release mechanism also releases the second locking mechanism when the ramp platform is in the fully stowed position.
In accordance with other aspects of this invention, the first locking mechanism includes a first latch arm operatively associated with the ramp platform to extend and retract with the ramp platform. The first locking mechanism also includes a first latch plate attached to the frame, wherein the first latch plate is engaged by the first latch arm when the ramp platform is in the fully deployed position.
In accordance with additional aspects of this invention, the first locking mechanism includes a second latch arm operatively associated with the ramp platform to extend and retract with the ramp platform and a second latch plate. The second latch plate is attached to the frame and is engaged by the second latch arm when the ramp platform is in the fully deployed position.
In accordance with yet other aspects of this invention, the ramp platform further includes a coupling operatively associated with the first and second latch arms, so that the first and second locking mechanisms operate simultaneously when actuated.
In accordance with still yet other aspects of this invention, the manual release mechanism includes a handle assembly operatively associated with the first latch arm when the ramp platform is in the employed position, such that actuation of the handle causes the first latch arm to release the first latch plate. The handle assembly is also operatively associated with the second latch arm when the ramp platform is in the stowed position, such that actuation of the handle assembly causes the second latch arm to release the stowed latch plate.
REFERENCES:
patent: 3511393 (1970-05-01), Abromavage et al.
patent: 4078678 (1978-03-01), Tordella
patent: 4131209 (1978-12-01), Manning
patent: 4243147 (1981-01-01), Twitchell et al.
patent: 4294571 (1981-10-01), Tordella
patent: 4325668 (1982-04-01), Julian et al.
patent: 4338642 (1982-07-01), Clark et
Cohn Alan R.
Lewis Cleatus A.
Simon Curtis J.
Christensen O'Connor Johnson & Kindness PLLC
Keenan James W.
Lift-U, division of Hogan Mfg.
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