the preferred embodiment illustrated is not intended to be exhaustive or to limit the invention to the precise form disclosed . it is chosen and described in order to best explain the principles of the invention and to enable others skilled in the art to best utilize the invention . as shown in fig1 - 4 , shelter 10 includes spaced apart parallel runners 12 which are connected together at the aft end of the runners by a floor 14 supported upon transverse rails 15 and a seat 16 located approximately mid - length of the runners . pivotally connected vertical supports 18 extend between runners 12 and seat 16 . a pair of inverted u - shaped frames 20 are pivotally connected to the front end of runners 12 and extend upwardly . the forward most frame 20 is pivotally connected to horizontal supports 22 which extend rearwardly and connect also to seat 16 . a flexible cover 24 , such as formed from canvas and illustrated by broken lines , extends about and over frames 20 . cover 24 includes left and right sides 26 which extend to at least upper edges 30 of the runners 12 and a rear side 28 . the front of cover 22 may be open or include a door which allows access into the interior of shelter 10 . the construction of cover 24 may have numerous variations well known in the art . frames 20 , rails 15 , and supports 18 and 22 may be of a light metal , such as aluminum construction , while floor 14 and seat 16 may be either wooden or metal construction . runners 12 are preferably of a frame form covered by a wall so as to produce a solid form of runner . by being of solid form , wind is prevented from entering the shelter from either the right or left sides . by pivotally connecting frames 20 and supports 18 and 22 , the support frames and seat can be collapsed or folded as illustrated in fig3 and 4 for ease of transportation and storage . the cover 24 of the shelter may be removed and folded prior to folding of the shelter . after the shelter is pulled to the desired site over the ground or ice , the frames and seat can be swung from their collapsed or lowered position shown in fig3 and 4 into their raised position shown in fig1 and 2 and the cover unfolded and placed over vertically extending frames 20 for usage of the shelter . in normal climatic conditions and intended use , the rear of the shelter would be placed into the wind with the front and usually open end of the shelter being position down wind . a locking brace 32 extends between one runner 12 and a frame 20 and is used when placed in its extended and locked position to secure frames 20 in their raised , cover - supporting positions . as thus far described , shelter 10 is of a known form and construction . while cover 24 is designed to extend at least to the level of the upper edges of runners 12 , there is a tendency for the wind as it is driven against the rear of the shelter to pass under floor 14 and into the shelter interior . this flow of air is blocked by a wind break which includes a plate 34 . plate 34 extends fully between runners 12 and is connected by hinge 36 at its upper edge to the forward edge of floor 14 . the width of plate 34 as measured from hinge 36 to the lower edge 38 of the plate preferably exceeds the height of runners 12 as measured from the ground 39 to the runners upper edges 30 so as to enable the plate to rest upon the ground or similar support when shelter 10 is positioned at the desired site and cover 24 is applied . in this manner , with plate 34 in its lowered position as shown in fig1 and 2 , a break is formed to prevent the entry of wind from the rear of the shelter into the interior in front of wall 14 . when shelter 10 is moved from location to location at a particular site when in its usable form with cover 24 in position , the shelter may be towed from its rear end by attaching a rope or towing cord to towing bar 40 connected to the rear most transverse support 15 under seat 16 . as the shelter moves from one location to another , any stones , lumps of dirt or snow upon the ground or ice 39 which passes between runners 12 will contact plate 34 and cause the plate to be pivoted upwardly about its connecting hinge 36 . when it is time to transport shelter 10 to a carrier such as a truck , plate 34 can be raised and pivoted upwardly and back over and rest upon wall 14 as best illustrated in fig4 and frames 20 and seat 16 collapsed after the removal of cover 24 . when shelter 10 is taken to a new direction site , frames 20 are raised and cover 24 reapplied over the frames with plate 34 being pivoted forwardly from its seat supported position in fig4 to its ground contacting position shown in fig2 . it is to be understood that the invention is not to be limited to the details above given but may be modified within the scope of appended claims .
a portable shelter having a pair of spaced apart runners supporting a frame carrying a suitable covering . a hinged plate extends between the runners and is shiftable between a lower position extendintg to the bottom of the runners for blocking the flow of air between the runners under the covering and a raised position to allow non - interfering movement of the shelter across the ground or ice .