Rapidly deployable modular shelter system

1. A leg element for use in a folding tent frame system, said folding tent frame system having a roof frame comprising arch brackets configured to receive a plurality of said leg elements, each said leg element comprising:

a) a first inner leg element comprising a base and a rigid vertical element mounted on said base, said rigid vertical element having a plurality of vertically spaced latch-receiving slots; and

b) a second outer sliding leg element slideably movable vertically on said first inner leg element, said second outer sliding leg element comprising a horizontally extending lifting bar secured thereto and a spring-biased latch element for securing said outer sliding leg element at selected vertical locations on said inner leg element, wherein said second outer sliding leg element further comprises adjacent the upper end thereof a spring-biased T-shaped lever rotatable about a central horizontal axis and forming a horizontal bar at the upper end thereof.

2. A folding tent frame comprising a folding roof frame, and a plurality of leg elements according to claim 1 engageable with said folding roof frame wherein said folding roof frame comprises a plurality of arch brackets located on the periphery thereof for releasably receiving and securing said plurality of leg elements.

3. The folding tent frame of claim 2 wherein each said arch bracket comprises a vertical passage open on the outer side thereof for receiving one of said outer sliding leg elements and opposed tapered interior surfaces for bearing against an outer surface of said outer sliding leg elements.

4. The folding tent frame of claim 2 wherein each said arch bracket comprises a flange for removably receiving said horizontal latch bar of said T-shaped lever.

5. The folding tent frame of claim 2 wherein said outer sliding leg elements comprise tapered outer surfaces configured to engage said tapered interior surfaces of said plurality of arch brackets.

6. A shelter system comprising a folding tent frame according to claim 2 , and a flexible tent body removably suspended from said folding tent frame when said folding tent frame is in an unfolded and locked configuration.

7. A method of deploying a shelter wherein said shelter comprises a folding tent frame according to claim 2 and a flexible tent body, said method comprising the steps of:

a) unfolding said roof frame, reversibly locking said roof frame in an unfolded configuration and placing said unfolded roof frame on a generally horizontal surface such as the ground;

b) removably securing said flexible tent body to said unfolded roof frame at a plurality of points;

c) securing said plurality of leg elements to said arch brackets of said unfolded roof frame wherein said leg elements are in a first lowered configuration to thereby raise one or both sides of said unfolded roof frame above said surface;

d) raising said roof frame further above said surface by sliding each said outer sliding leg elements of said plurality of leg elements vertically on each said first inner leg element to thereby secure each said leg element in a further extended configuration;

e) repeating step d) until said unfolded roof frame has been raised to a selected extended height;

f) before or in the course of any one of steps c), d) or e) securing each base of said plurality of leg elements to said generally horizontal surface; and

g) further securing said flexible tent body to said roof frame and extended leg elements and said generally horizontal surface.

8. The method of claim 7 wherein said bases of said leg elements comprise apertures and in step f) each base of said plurality of leg elements is secured to said surface using stakes extending through said apertures into said surface.

9. The method of claim 7 wherein in step d) said outer sliding leg elements are slid vertically on each said first inner leg element by lifting said horizontally extending lifting bars.