Abstract:
A mechanical lift system for a truck topper comprising a power lift arm and securing one side of the truck topper to the upper side of the truck bed by a continuous hinge or a series of two or more hinges allowing the truck topper to open 90 degrees and close the truck topper.

Description:
DETAILED DESCRIPTION OF THE INVENTION 
   In reference to  FIGS. 1 , and  2 , the inside base  1  of a longitudinal side of a vehicle canopy or cover  2  is affixed to the top side of the truck bed  3  by a series of hinges  4  or a continuous hinge, all of which will maintain stability of the cover when lifting, closing, or in the open or closed position. In reference to  FIG. 1 , the top flange of the hinge  4  is secured to the bottom of the canopy or cover side in a safe and appropriate manner. In reference to  FIG. 2 , the end of the bottom flange of hinge  4  is bent at a 90 degree angle downward in order to secure the hinge to the top inside portion of the truck bed. This is done to accommodate a safe and easy method of attaching the canopy or lid to the vehicle. 
   In reference to  FIG. 3 , the mechanical lift system is comprised of two parts. The first part is comprised of a base plate  5 , which is preferably affixed to the top of a vehicle wheel well  6 , and an upright arm  7  which is permanently attached to the base plate  5 . The upright arm  7  is then attached to the top inside of the truck bed  3  via a moveable plate and sleeve  9  which is attached to the upright arm  7 . Again, in reference to the base plate  5 , a pivotal point  10  is attached to the base plate to accommodate the base of the power pack  11  used. In addition, the top of the upright arm  7  has also a pivotal point  12 . 
   The second part of the mechanical lift system is the lift arm mechanism. Again, in reference to  FIG. 3 , it is comprised of a lift arm  13  that is attached to pivotal point  12 , and follows the upward contour of the canopy  2  to the cover ceiling. It then follows adjacent to the canopy ceiling in a parallel manner to the opposite side of the canopy ceiling to pivotal point  14 . In addition, the lift arm  13  has a guide arm  15  with a pivotal point  16  at its end. Pivotal point  16  is the connection point for the top end of the power lift  11 . Also attached to the guide arm  15 , is a support arm  17  which also attaches to the upper portion of the lift arm  13 . The lift arm mechanism continues with a down arm  18  connected to pivotal point  14  and follows downward the contour of the canopy side and connects with pivotal point  19  which is on inside base cover plate  20 . The inside cover base plate  20  is attached to the canopy inside cover base  21 . 
   A heavy gauge wire ( 12 ) should be used to connect the power pack  11  to the vehicle battery through an ON-OFF-ON 3-way toggle (intermittent rocker) switch. A 20 amp fuse should be placed on line between the battery and the toggle switch. This switch may be placed where it is most convenient to the customer. 
   The novel of this operation is the fact that it is simple and uncomplicated. We are using a structure (the canopy) that was intended to be a rigid on a truck box, to be opened and closed at will, thus allowing complete access to the truck bed and free access to all cargo you haul eg: fuel tanks, service lubricants, tools, miscellaneous equipment. When using this lift arm, the canopy is automatically secured while in the down position due to the character of the actuator used. 

   
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG.  1 —is a perspective view of attaching the upper hinge flange to the bottom side of a vehicle canopy or cover. 
     FIG.  2 —is a perspective view of the bottom hinge flange with the end of the flange bent over at a 90 degree angle where it is secured to the top side of the vehicle bed. 
     FIG.  3 —is a perspective view of the complete lift arm and power system as seen attached to the vehicle bed. 
     FIG.  4 —is a perspective view of an installed canopy lift system with the canopy nearly in the vertical or open position. 
   

   DESCRIPTION OF PRIOR ART 
   A search for prior art includes: U.S. Pat. No. 3,578,387 LIFTABLE VEHICLE TOP; U.S. Pat. No. 3,923,334 TRUCK BODY CLOSURE; U.S. Pat. No. 3,954,296 VEHICLE BED COVER ASSEMBLY; U.S. Pat. No. 4,101,162 RAISABLE TOPPER; U.S. Pat. No. 4,277,098 VERTICALLY SWINGABLE CAMPER SHELL; U.S. Pat. No. 4,420,181 TRUCK BED CAP STRUCTURE; U.S. Pat. No. 4,768,824 TRUCK BED COVERING; U.S. Pat. No. 5,102,185 LOAD BED LIFT ROOF COVER; U.S. Pat. No. 5,503,450 TRUCK LID LIFT SYSTEM; U.S. Pat. No. 5,909,921 TRUCK CARGO COVER.