Land vehicles – Wheeled – Articulated vehicle
Reexamination Certificate
2000-09-07
2003-04-29
Lerner, Avraham (Department: 3618)
Land vehicles
Wheeled
Articulated vehicle
C280S500000, C280S164100
Reexamination Certificate
active
06554311
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates the hitch bar and hitch ball of a receiver type hitch assembly used on pickup trucks and other vehicles for towing boat trailers and other trailers.
BACKGROUND OF THE INVENTION
Owners of recreational boats typically have a boat trailer for moving the boat from storage to a lake, river or other body of water. Boat trailers are usually towed by a pickup truck or other vehicle to a boat ramp for unloading the boat. When the truck pushes the boat trailer down the boat ramp into the water and after any tie downs and a winch cable from the trailer's winch are released, the boat floats off the trailer and is available for use.
When the boat is loaded to the trailer from the water, the winch cable is attached to the boat and the winch, hand cranked by an operator, pulls the boat onto the trailer. The winch operator, typically not certain of the footing at the boat ramp, typically stands on the tongue of the trailer or the bumper of the truck in order to be in position for operating or turning the handle of the winch. Although neither the tongue of the trailer nor the bumper is a safe place to stand when operating the winch, these somewhat narrow steps are the only steps available. For safety reasons it would be desirable to have a place with better footing to stand when operating the winch. Such a place, a step, should not hinder any of the normal operation of truck the towing apparatus.
In addition to providing a step or a place to stand for the operator of the winch, the step could provide additional benefits. For example the step could provide a place to step from the ground to the bed of the pickup truck or a place to stand when loading items in the bed of the pickup truck.
The present invention uses a receiver hitch (“receiver”) and a hitch bar assembly as elements for attaching a step plate assembly or step to vehicles having a receiver. Typically, the hitch bar assembly may support a vertical load of 300 pounds or more and is therefore capable of supporting a step plate assembly in addition to the typical weight of a person standing on a tread plate of the step plate assembly.
The step plate assembly of the present invention includes a support structure, a pivot plate and a tread plate as an integral parts of the hitch bar assembly. The hitch bar assembly is typically installed and pinned into the receiver of a pickup truck or similar vehicle. The hitch bar assembly is typically comprised of a hitch bar with a coupling end and a tongue end where the tongue end has a hole for attaching a hitch ball with washers and a nut. The receiver of a vehicle may be a factory installed option or may be installed at a specialty shop. Hitch bar assemblies are usually available at stores that sell truck and auto parts The present invention adds a step plate assembly to the hitch bar assembly in a novel and cost effective manner.
The problem associated with having a step plate assembly coupled to the hitch bar assembly, and probably the reason such a step plate assembly is not used, is that a step would hinder the removal and attachment of a trailer hitch to the hitch ball. However a step is desirable for when a boat trailer is attached to the hitch ball, since a person using a winch to pull the boat on a trailer needs a suitable place to stand when rotating the crank handle of the winch. Hence a step plate could serve to provide a place for secure footing instead of using the truck bumper or the shaft of a trailer bar. The present invention, the step plate assembly, provides a place to stand and therefore reduces accidents that occur with existing equipment.
There are prior art step plates that attach to the hitch bar of a receiver assembly. However the prior art step plates serve only one purpose, providing a place to stand. If it is desired to use the receiver for another purpose, such as a trailer hitch, a bike rack, a ski rack or the like, the prior art step plate must be removed. There are also many combinations and accessories which are sold to magnify the utility of the receiver, since receivers are a common accessory on many trucks and other vehicles. However, the inventors are not aware of any apparatus or assembly which allows the standard hitch bar to serve as both a trailer hitch and a step. Hence there is a need for a step plate apparatus or assembly that could provide a place to step or stand and in addition could provide access to a hitch ball for pulling a trailer. Further it would be desirable if such an apparatus was easy to install or remove. It would also be desirable if such an apparatus could provide the described functions at a cost less than the cost of purchasing both a hitch assembly and a prior art step plate.
SUMMARY OF THE INVENTION
In view of the needs for an improved apparatus to provide a step and a trailer hitch, one object of the present invention is to replace two assemblies, an individual prior art step plate and an individual trailer hitch, with a step plate assembly that provides both a step and a trailer hitch.
Another object of the present invention is to furnish a step plate assembly that is easy to install on or remove from a traditional hitch bar and has a simple structure, thereby reducing cost.
Yet another object is to provide a step plate assembly that does not hinder the attachment of a trailer or obstruct the movement of a trailer when the trailer is being towed by a vehicle.
The above and other objects are met by a step plate assembly for attachment to a receiver bar of a hitch assembly where the receiver bar has a tongue for holding a hitch ball with a nut and washer. The step plate assembly is comprised of a support frame having a horizontally oriented bottom side with a hole for attachment to a bottom side of the tongue with the nut, the support frame also has a left side and a right side extending vertically upward and perpendicular to the bottom side. The vertical sides may also have flanges extending horizontally and outward to provide support for a tread plate. A pivot plate is pivotally mounted to the left and right side of the support frame using a bolt as pivot pin. A tread plate attached to the pivot plate serves as a surface of a step when horizontally oriented and when the tread plate is rotated upwardly to a vertical position a trailer tongue has access to the hitch ball. Most of the time the tread plate is oriented or positioned horizontally and is only moved to a vertical position when the trailer tongue is attached to or removed from the hitch ball. Notches in the vertical sides of the support frame allow the tongue of the trailer to move from side to side and therefore do not obstruct the movement of the trailer.
An abbreviated description of the present invention indicates that the step assembly is comprised of a support structure having a means for supporting a step plate, where the supporting means provides for the step plate to pivot or rotate between a horizontal position and a vertical position where the step plate is a step when the step plate is in the horizontal position.
It will become apparent upon reading a detailed description and viewing several illustrations that the objects of the present invention are met by the step plate assembly described in the detailed description of the invention.
REFERENCES:
patent: 3394947 (1968-07-01), Strube, Sr.
patent: 3580613 (1971-05-01), Northrop
patent: 3588160 (1971-06-01), Reiner
patent: 3610658 (1971-10-01), Sartori
patent: 3716254 (1973-02-01), Tarvin
patent: 3779580 (1973-12-01), Thelen
patent: 3794345 (1974-02-01), Locke
patent: 4301953 (1981-11-01), Abbott
patent: 4943076 (1990-07-01), Tripke
patent: 5135274 (1992-08-01), Dodd
patent: 5803475 (1998-09-01), Dick
patent: 4-372434 (1992-12-01), None
Blankenship Lowell E.
Dawson, Jr. Willie L.
Dodd Curtis W.
Lerner Avraham
USA Ramp, Inc
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