Tonneau cover having securing mechanism

A tonneau cover apparatus for removable attachment about a top of a perimeter of a cargo box of a pickup truck, the perimeter of the cargo box including a forward end, two opposing sidewalls and a tailgate, the tailgate being positioned rearward of the forward end and having an open position and a closed position, the tonneau cover apparatus comprising:

• a furlable cover;
• a support frame for attachment to the cargo box, the support frame having two opposing side rails, each of which can be secured to one of the respective opposing side walls;
• and
• a cover securing plate having first and second ends, the cover securing plate being attached to the cover, the cover securing plate being engageable with the respective side rails to secure the cover to the support frame;
• wherein the cover securing plate includes a locking member and a channel proximate one of the respective ends;
• wherein the cover securing plate is linear and the channel extends entirely within the cover securing plate;
• the locking member being slidably secured at least partially within the channel;
• wherein the cover securing plate is prevented from disengaging from the respective side rail, when the locking member is in a first position and the cover securing plate is secured to each of the respective side rails;
• wherein the locking member is biased toward the first position;
• and wherein the cover securing plate can disengage from the respective side rails when the locking member is in a second position.