Abstract:
A wheeled cart to provide light weight, collapsible and portable mobility for individuals who have the need to be in the prone position. The bed of the cart and the two large front wheels are provided with quick disconnect means and the two sides of the tubular frame of the prone cart fold easily together for transport.

Description:
BACKGROUND OF THE INVENTION 
     This invention relates generally to an improved means of light-weight, collapsible, and portable mobility for individuals who must be in the prone position, such as those having a physical handicap. 
     In the past, prone boards have been equipped with wheels, such as the Ambulatory Wheelstand disclosed in Daniel W. Davis U.S. Pat. No. 4,620,714, see also L. E. Hoffman&#39;s Hospital Buggy, U.S. Pat. No. 651,605, W. F. Berstein&#39;s Vehicle for Hospital and Other Purposes, U.S. Pat. No. 922,841, W. F. Bernstein&#39;s Stretcher for Hospital and Other Purposes, U.S. Pat. No. 970,877 and L. Q. Peterson&#39;s Mobile Carrier, U.S. Pat. No. 2,715,030. Some of these have been combined with a collapsible support frame, such as R. L. Hastings&#39; Foldable Utility Cart, U.S. Pat. No. 3,223,429, I. C. Klingler&#39;s Collapsible Stretcher, U.S. Pat. No. 2,596,250, E. Sullivan&#39;s Portable Cot, U.S. Pat. No. 2,360,453, O. L Herod&#39;s Stretcher, U.S. Pat. No. 1,924,496, and H. Liedtke&#39;s Folding Stretcher, U.S. Pat. No. 1,483,607. However, there has not been a device, which allows individuals who must be prone to be self-mobile, while being capable of rapid and easy collapse and portability. 
     Therefore, the primary object of this invention is to provide people who must be prone the means to move about in our society less encumbered and to make the task of their supporters easier. Individuals who must be prone rely upon others for much of their mobility, i.e. interfacing with various modes transportation other than their personal mobility device. It has long been known that there is a need to make these personal mobility devices, such as wheel chairs, stretchers and carts, as portable as possible, so that they may accompany the disabled individual on other modes of transportation. This invention will greatly reduce the task of those who support such individuals and thus increase the mobility of such individuals throughout the spectrum of modes of transportation. 
     SUMMARY OF THE INVENTION 
     The foregoing objectives are satisfied by this invention, which is comprised of an open sided, wheeled cart having a mobile mattress, removably attached to a top pair of tubular parallel bars, held in fixed relation to each other by means of an &#34;X&#34; support, the top of the arms of which are readily freed from a set of parallel bars located near the mid-point of the sides so as to enable the frame to fold for travel. The bottom of the &#34;X&#34; frame is comprised of a section of aluminum tubing inserted within the span of the bottom parallel bar of a side by means of a sleeve of phenolic material of slightly smaller outside diameter than the inside diameter of the tube of the &#34;X&#34; frame and the bottom parallel bar, so that the bottom of the &#34;X&#34; frame can smoothly rotate around the circumference of the bottom parallel bar. The mobile mattress is removably mounted to the top pair of parallel bars by means of saddle clamps. The frame is of tubular aluminum construction resting on standard axle and wheel means and wheel chair wheels with standard quick release hubs, on one end, and small steerable wheels mounted by standard caster means on the opposite end of the cart. 
     The novel features of the invention will be best understood from the following description in light of the accompanying drawings. While particular embodiments of the present invention are shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from this invention in its broader aspects and, therefore, the aim of the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of this invention. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a view from the left front of a cart made according to my invention. 
     FIG. 2 is an expanded view of the base of the &#34;X&#34; frame rotatably communicating with the bottom parallel tubular side of the cart. 
     FIG. 3 is a cross-sectional view of the preferred means of joining the aluminum tubing used in my invention. 
     FIG. 4 is an expanded view of the means of removably attaching the bed to the top parallel bars of my invention. 
     FIG. 5 is a plane view of the underside of the bed. 
     FIG. 6 a side elevational view of my invention in its folded state for travel or storage. 
     FIG. 7 is an isolated view of one side of the &#34;X&#34; frame. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     With reference to the drawings and particularly FIGS. 1 and 6 thereof, the preferred embodiment of the Prone Cart of the present invention is there shown and comprises a bed (1), two tubular sides (10), an &#34;X&#34; frame (49) and four wheels, two standard wheel-chair wheels (37) and two small wheels (39). For storage for travel the bed (1) detaches from the tubular sides (10), the standard wheel-chair wheels (37) detach from the tubular sides (10), and said tubular sides fold together via the &#34;X&#34; frame (49). 
     With reference to FIGS. 1, 4 and 5 the bed (1) is shown to be comprised of 1/2 inch plywood (2), or other suitably rigid material, of sufficient size to accommodate a patient or other user, overlaid with a suitable cushioning material (3) on the top of the bed, and covered with a stain resistant material (4), such as vinyl, while the bottom of the bed (5) has three equally spaced channels (6), routed out perpendicular to its length so as to accommodate three flat aluminum bars (7), preferably 2 inches wide and 1/4 inch thick, which are fixedly attached to the 1/2 inch plywood (2) by standard bolt means (8). With specific reference to FIG. 4, a quick release fitting (25), for attaching and detaching the bed (1), from the top pair of parallel bars (9) of the tubular sides (10), is shown to be comprised of a saddle clamp (11), anchored to each end of the flat aluminum bars (9) by standard screw means (12), the head of which is counter sunk into the bottom face (13) of the saddle clamp (11) so as not to contact the top pair of parallel bars (9) when the saddle clamp (11) sets astride the top pair of parallel bars (9), and held securely in place by a standard release pin (14), which release pin (14) is permanently secured to the saddle clamp (11) by a standard wire cable (15), so as not to become lost when the release pin (14) is removed for travel or storage of the invention. FIG. 6 discloses two standard security belts with quick release buckles (41), fixedly attached to the bed (1) to stabilize its user. 
     With reference to FIGS. 3, 6 and 7, the means of joining the sections of the tubular side (10) and the sections of the &#34;X&#34; frame (49) together, other than the base aluminum tube (29) for the &#34;X&#34; frame (49) to the vertical parallel tubes for the &#34;X&#34; frame (48) which is by standard aluminum weld means (6), is by standard cup and bolt means. The preferred embodiment of the invention utilizes T6 6061 Aluminum Tubing 11/8 inch by 0.065 inch for its tubular members and T6 6061 Aluminum Solid 11/4 inches for the aluminum tubing cap insert (18), said aluminum tubing cap insert (18) being milled out at its top radius (19) to accommodate a 11/8 inch aluminum tube (20), while its bottom 2/3rds is turned down to 11/8 inch by 0.990 inch (17) so as to fit inside the T6 0661 Aluminum tubing 11/8 inch by 0.065. The tube (20) to be mated with the tube cap (18) is joined by standard screw means (21) communicating through the tube to be mated (20) and into a pre-drilled receiving hole of appropriate size and thread, in the aluminum solid (17),(18), said turned-down portion (17) of the tubing cap insert (18) being secured within the Aluminum tubing (16) by means of a standard aluminum rivet nut (23) pressed into a hole, (22), of appropriate dimension, drilled through the aluminum tube (16) and the aluminum solid (17). 
     With specific reference to FIGS. 1 and 6, there is disclosed the two standard wheel-chair wheels (37) which are mounted on the invention with standard wheel-chair quick disconnect hubs (38) on the vertical strengtheners (28) running from the bottom parallel tube (24) to the mid-pair of parallel bars (26) of the tubular side (10), and the two small wheels (39) rotatably attached by standard caster mounts (40) to the bottom parallel tubes (24) at the end opposite to the standard wheel-chair wheels (37), just inside the vertical strengtheners (28) on that end of the tubular side (10). Vertical parallel bars (27) join the top pair of parallel bars (9) to the bottom parallel tubes (24) of the tubular sides (10), at their ends by standard cup and bolt means described above, and are further stabilized in vertical and perpendicular relation thereto by a mid-pair of parallel bars (26). 
     With specific reference to FIGS. 2 and 7, the preferred embodiment of the &#34;X&#34; frame (49) is disclosed to be comprised of two identical sections of tubular aluminum construction, each having a base aluminum tube (29), a pair of vertical parallel tubes (48) of sufficient length to span the distance from the bottom parallel tube of the tubular side (24) to the mid pair of parallel bars (26) when the bed (1) is installed on the top pair of parallel bars (9), the two identical sections being rotatably joined, by standard screw and nut means (42) through pre-drilled holes (43) at the mid-point of the length of the vertical parallel tubes (48) for the &#34;X&#34; frame (49). The top parallel tubes (44) of the two identical sections of the &#34;X&#34; frame are slightly shorter than the span of the tubular sides (10) so as to allow the &#34;X&#34; frame (49) freedom of movement. The vertical parallel tubes (48) for the &#34;X&#34; frame are equipped with rigid supports (45) being fixedly attached to said vertical parallel tubes (48) by standard screw means (46), so that the opposite end of said rigid support (45), being of suitable concave shape (47), engages the upper surface of the mid pair of parallel bars (26) of the tubular side (10) when the &#34;X&#34; frame (49) is extended to stabilize the relative position of the components of the invention when the bed (1) is installed on the top pair of parallel bars (9). 
     The base aluminum tube (29) for the &#34;X&#34; frame is joined by standard aluminum weld means (36) to the one vertical parallel tube (48) and is of identical cross-sectional dimension as the bottom parallel tube (24) of the tubular side (10) so that it is inserted within and becomes a part of the bottom parallel tube (24), being rotatably affixed thereto by means of a solid tube of suitable phenolic material (30), which has the same external diameter as the internal diameter of the base aluminum tube (29) and the bottom parallel tube (24) and of sufficient length to span the base aluminum tube (29) and extend on both ends thereof a sufficient distance into the bottom parallel tube (24) and being anchored in relative position to each tube (24), (29) by standard aluminum rivet means (35) through a hole (33) drilled through the aluminum parallel tube and in the base aluminum tube (29) for the &#34;X&#34; frame (49). The ends of the tubes communicating with each other are protected by standard nylon bushings (32). 
     Although particular embodiments of the present invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from this invention in its broader aspects and, therefore, the aim in the appended claims is to cover all such changes and modifications as fall within the true spirit and scope of this invention.