Abstract:
A trailer coupler which has two cameras mounted at right angles at the rear of the towing vehicle. The cameras transfer images to a monitor inside the cab of the towing vehicle.

Description:
Applicants claim priority for Provisional application Ser. No. 61/214,596, filed Apr. 27, 2009. 
    
    
     BACKGROUND OF THE INVENTION 
     This invention relates, in general, to trailer accessories, and, in particular, to a trailer accessory for coupling a trailer to a towing vehicle. 
     DESCRIPTION OF THE PRIOR ART 
     In the prior art various types of trailer accessories have been proposed. For example, U.S. Pat. No. 7,309,075 to Ramsey et al discloses a trailer coupler which uses a single camera attached to the rear of the towing vehicle (see col. 8, lines 5-7). 
     U.S. Pat. No. 7,195,267 to Thompson discloses a trailer coupler which uses a single video camera, a transmitter and a light to transmit an image to a monitor in the cab. 
     U.S. Pat. No. 7,171,769 to Schultz et al discloses a trailer coupler which uses a single video camera. 
     U.S. Pat. No. 6,386,572 to Cofer discloses a trailer coupler which uses an optical guide. 
     Users of trailers have difficulty in aligning the towing vehicle&#39;s hitch with the trailer hitch. The user must align the hitches of the two vehicles at least one of which is out of sight from the driver&#39;s seat. Generally two people are needed to align the two hitches; one the driver and the other person outside of the vehicle where he can see the two hitches and signal the driver in how to maneuver the towing vehicle. 
     However, if the user is alone the process becomes much more difficult. The user must back the vehicle up, get out and check its alignment, back up some more, get out to check the alignment, and so on until the process is completed. Therefore, there is a need for an alignment system that allows a user to conveniently and precisely align a trailer hitch with the towing vehicle hitch. 
     Prior art devices such as the patent to Ramsey et al (U.S. Pat. No. 7,309,075) have used a single camera to allow the user to view the area behind the towing vehicle, however, the single camera gives an, essentially, two dimensional view, which is inadequate in a three dimensional world. 
     SUMMARY OF THE INVENTION 
     The present invention is directed to a trailer coupler which has two cameras mounted at right angles at the rear of the towing vehicle. The cameras transfer images to a monitor inside the cab of the towing vehicle. 
     It is an object of the present invention to provide a new and improved trailer coupler. 
     It is an object of the present invention to provide a new and improved trailer coupler which can be installed in a new vehicle or retrofitted to an older vehicle. 
     It is an object of the present invention to provide a new and improved trailer coupler which uses multiple visual devices to provide an improved coupling guide. 
     These and other objects and advantages of the present invention will be fully apparent from the following description, when taken in connection with the annexed drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of the cameras of the system of the present invention mounted on a trailer hitch. 
         FIG. 2  is a view of the viewing screen of the system of the present invention. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
     The preferred embodiment herein described is not intended to be exhaustive or to limit the invention to the precise form disclosed. It is chosen and described to best explain the invention so that others, skilled in the art to which the invention pertains, might utilize its teachings. 
     Referring now to the drawings in greater detail,  FIG. 1  shows a perspective view of the present invention  1 . The towing vehicle hitch is a conventional hitch having a horizontal portion  4  attached to a vertical portion  2  which is, in turn, attached to a towing vehicle (not shown) by any conventional method. A conventional trailer ball  3  is secured to the horizontal portion  4  in any conventional manner. Since the towing vehicle hitch and the method of attachment are conventional no further description is necessary. 
     A first camera  5  is secured to the vertical portion  2  of the towing vehicle hitch and is pointed rearwardly at the ball  3 . This camera will allow the operator to view the hitch and determine whether the operator should move the towing vehicle right or left in order to align with the corresponding hitch on the trailer. However, the single camera gives basically a two dimensional view and the operator will still have some difficulty in aligning the vehicles in order to couple the towing vehicle hitch and the trailer hitch due to a lack of perspective. 
     In order to alleviate this difficulty a second camera  6  is mounted on the horizontal portion  4  of the towing vehicle hitch by any conventional method. The second camera is mounted approximately horizontally of the portion  4  of the towing vehicle hitch and the ball  3 . The view from the second camera along with the view from the first camera will provide the operator with a perspective view to align the towing vehicle hitch with the trailer hitch. 
       FIG. 2  shows a screen  8  mounted within a vehicle dashboard  7 . It should be noted that while the screen is shown as being mounted within a dashboard this is not critical. The screen could be mounted on the exterior of the dashboard and secured thereto in any conventional manner. Controls  11  are mounted adjacent to the screen and will control various aspects of the screen such as brightness, contrast, etc. 
     Conventional wiring or a wireless camera will be used to electronically connect the cameras  5 ,  6  to the screen  8 . The screen, as shown in  FIG. 2 , is divided by an imaginary dotted line  11  to indicate two portions. The view of camera  5  could be shown on the left hand side of the screen  9  and the view from the camera  6  could be shown on the right hand side  10  of the screen. This would give the operator views from both cameras simultaneously. It should be noted that the side of the screen showing camera  5  and the side showing camera  6  have been selected randomly and if so desired the view form camera  5  could be shown on the right side  10  of the screen and the view from camera  6  could be shown on the left side  9  of the screen without departing from the scope of the invention. 
     If an operator found the views from both cameras at the same time to be confusing he could use one of the controls  11  to switch from showing both cameras to showing first camera  5  and then switching to camera  6 . The controls would allow him to switch from camera  5  to camera  6  manually or the controls could allow the screen to switch automatically from one camera to the other. In addition, the controls could allow the operator to select a timing sequence. For example, a timer could allow the view from camera  5  to stay on the screen for a selected period of time, then switch to the view from camera  6  for a selected period of time. The operator would be able to select the amount of time the views would appear on the screen, and then the operation would become automatic. 
     Although the Trailer Coupler and the method of using the same according to the present invention has been described in the foregoing specification with considerable details, it is to be understood that modifications may be made to the invention which do not exceed the scope of the appended claims and modified forms of the present invention done by others skilled in the art to which the invention pertains will be considered infringements of this invention when those modified forms fall within the claimed scope of this invention.