A vehicle tonneau cover design that adjustably accommodates changes in the size of the tarp of the tonneau cover due to weather or the like and provides stable attachment of the tarp to the vehicle. The tonneau cover includes a tarp, a frame coupled to the vehicle, and a latch assembly made up of a latch bar attached to the free end of a cover and a pair of latch mechanisms used to lock the latch bar to the frame at an attachment point. The latch mechanisms are releasable and adjustable to change the longitudinal position of the attachment point relative to the frame.
1. A tonneau cover for a truck box comprising:
a. a frame having a first rail and a second rail;
b. a tarp having a free end;
c. a latch bar attached to said free end;
d. a first latch mechanism attached to said first rail and a second latch mechanism attached to said second rail, said first and second latch mechanisms each comprising (i) a block fixed to the rail; (ii) a housing slidably coupled to said block, said housing including structures that releasably secure the latch bar to said housing at an attachment point; and (iii) a mechanism for adjusting the longitudinal position of the attachment point relative to the rail comprising a bolt carrying an engagement surface, said bolt coupled to the block, and a stop on the housing which cooperates with said engagement surface to define the position of the attachment point and whereby the position of the attachment point can be adjusted by turning the bolt.
2. The tonneau cover of claim 1 further including a calibrated guide for indicating the distance between said engagement surface and said stop.
3. The tonneau cover of claim 1 further including a calibrated guide indicating the position of the attachment point.
4. The tonneau cover of claim 1 wherein said structures that releasably secure the latch bar to the housing at the attachment point include a biased pall.
5. The tonneau cover of claim 4 further including a tool coupled to the pall for releasing the latch bar.
6. The tonneau cover of claim 5 wherein said tool is a cable attached to the pall and the frame.
7. The tonneau cover of claim 1 further including another engagement surface and biasing member positioned between said engagement surfaces.
8. A tonneau cover for a truck box comprising:
a. a frame having a first rail and a second rail;
b. a tarp having a free end;
c. a latch bar attached to said free end;
d. a first latch mechanism attached to said first rail and a second latch mechanism attached to said second rail, said first and second latch mechanisms each comprising (i) a block fixed to the rail; (ii) a housing slidably coupled to said block, said housing including structures that releasably secure the latch bar to said housing at an attachment point; and (iii) a mechanism for adjusting the longitudinal position of the attachment point relative to the rail comprising a bolt coupled to the block, an engagement surface associated with said block, and a stop on the housing which cooperates with said engagement surface to define the position of the attachment point and whereby the position of the attachment point can be adjusted by turning the bolt.