US 2470258 A
Description (OCR text may contain errors)
May 17, 1949.
F. MUSTAFA I COLLAPSIBLE WHEEL CHAIR 2 Sheets-Sheet 1 Filed May 26. 1947 INVENTOR Fer/70d Musfafa ATTO' NEY May 17, 1949. F. MUSTAFA COLLAPSIBLE WHEEL CHAIR Filed May 26, 1947. 2 sheets-s heet 2 IO 44 4 45 l4 l5 \E 12' I i X I 44 INVENTOR 4 Patented May 17, 1949 UNITED STATES PATENT OFFICE COLLAPSIBLE WHEEL CHAIR Ferhad Mustafa, Highland Park, Mich.
Application May 26, 1947, Serial No. 750,571
2 Claims. (01. 155117) The purpose of my improvement is to provide a collapsible wheel chair of novel construction. My object is to provide a chair which may be easily set up for use and which may be just as easily collapsed for storage. The construction of the chair is such, that by raising a part of it at the top, the chair sets itself up automatically. On the other hand, a pull on one definite member of the chair will serve to collapse it.
I shall now describe my chair with reference to the accompanying drawings, in which:
Figure 1 is a perspective view of the chair as set up for use and shown in a smaller relative size than in the following views;
Figure 2 is a side elevation of the chair'shown in Figure 1;
Figure 3 is a side elevation of the chair as collapsed;
Figure 4 is a top elevational view of said chair;
Figure 5 is a longitudinal sectional view of the chair on line 5-5 of Figure 4;
Figure 6 is a sectional view on line 66 of Figure 5.
Similar numerals refer to similar parts throughout the several views.
The chair includes a base frame which is composed of two parallel members It], each of them being provided with a pair of upstanding side guards l2. A plurality of transverse rungs l3 gives the guards the appearance of ladders, the rungs being spaced from the top of members I0. Resting on top of said members I0, but under the rungs I3 is a bar I I which is in a sliding relation to said member I0. A bolt [5 projecting upwardly from member l0 passes through a slot l4 in bar II and is provided with a thumb screw I6 by means of which the bar may be secured in place against longitudinal movement'with respect to said member l0. Casters l1 under members l0 and wheels l8 on the bar I I permit the chair to be wheeled. The casters it will be noted, are secured to a transverse block [9, while the wheels at the front are mounted on stub axles projecting laterally from block 20. Pivotally connected to rod 2| which is afiixed to the top surface of block 20, are two main rails 22 extending in parallel upwardly and rearwardly, as best shown in Figure 2. The rails are bound together at the top by a tie rod 25. Extending upwardly from the rod are two parallel members 23 connected by a transverse handle bar 24. A pair of cross rails 26 extend upwardly and forwardly from a horizontal rod 21 affixed in place on top of block l9. The rails 26 are pivotally connected in what is known 2 as scissor type arrangement to the main rails 22 at 28.
Now I shall describe what may be called the arm rest assembly of the chair. This includes, an arm rest 29 on each side of the chair. Each arm rest is supported by a prop 30 at the front and a prop 32 at the rear. Said props 30 are pivotally afiixed at 3| to the respective main rails 22. Rear props 32 are connected at the top by a cross pin 34, the cross pin being disposed within a horizontal slot 35 in a member which forms the under side of arm rest 29. At the lower end the props 32 are joined by a cross bar 36 which rests on cross rails 26, being in a longitudinally sliding relation thereto. As shown in the drawings, said props 30 at the front are disposed in a substantially parallel relation to props 32 at the rear and are held so by a link 40 pivoted at each end to the respective props.
Fulcrumed to cross rails 26 by means of a bolt 38 is a lever made of two parallel arms 31 which are normally disposed in a substantially horizontal position, the arms being provided on their underside with a plurality of notches 39 which are adapted to fit over a cross bar 36 joining props 32.
A coiled spring 4| anchored to a transverse member 43, supported by end blocks 44 on bar II, is connected at the opposite end to said lever. This is effected by means of another transverse member 42 the ends of which are inserted into the respective arms 31 of the above said lever. The object of the spring is to exert a downward pull on the lever to keep the sliding bar 36 in a frictional engagement with the respective notches 39 in said arms 31. A strip of flexible textile material 5! extends from rod 25 to another rod joining the outward ends of cross rails 26 and serves as a seat. A cord 46 aflixed to the end portion of the lever at 31a, is looped at the opposite end over the tie rod 25, and serves as a means of swinging the lever upwardly from its fulcrum 38 against the tension of spring 4|.
The manner in which the chair may be used is quite obvious. It may be set up for use into a structure best shown in Figures 1 and 2 or it may be collapsed, its parts folding up as shown in Figure 3. Assuming that the chair is collapsed, and that it is to bet set up for use, all that needs to be done is to grasp the rod 25 and lift it to a suitable height. What will result is as follows: Rails 22 will pivot around from rod 2 I, cross rails 26 being connected at 28 to said rails 22, will swing up from the opposite end of the chair, that is pivot around rod 21. The movable bars I I will move forwardly over the frame members ID and lever arms 31, drawn downwardly by spring 4!, will clamp over the sliding bar 36 until said bar will fall into one pair of notches 39. This will in effect lock in place the whole super-structure of the chair including rails 22, 26 and bars H, the latter being a part of the base framework of the chair. It will be understood that the angle of inclination of rails 22 on the chair as set up, depends upon which pair of the respective notches gets into engagement with the sliding bar 36. This will be apparent on referring to the drawing in Figure 2, where the rails 22 may be swung closer to the base of the chair on allowing the sliding bar 36, to engage the free pair of notches 39, said notches being closer to the free end of lever arms 31.
In order to collapse the chair all that has to be done is to exert an upward pull on cord 46. This will swing the lever 31 out of engagement with sliding rod 36 whereupon spring 4| will pull rails 26 and 22 downwardly. It will be understood that in the process of the collapse, props 36 and 32 will fold up as shown in Figure 3.
After having described the construction of my chair and the manner of its operation, I wish to claim as follows:
1. A chair of the kind described includin a telescopic base frame composed of a relatively stationary rear member and a movable front member, each mounted on ground wheels, a pair of rails pivotally afiixed to the front member and extending rearwardly, a pair of rails pivotally afixed to the rear part and extending forwardly,
said first mentioned rails and said second mentionedrails being pivotally connected in a scissor type formation midway their respective lengths, a transverse rod connected to back ends of the first mentioned rails and another connected to front ends of said second mentioned rails, a flexible webbing to form a seat, said webbing extending between said transverse rods, the rails and the top portion of the cross rails respectively, an arm rest on each side of the chair and two vertical props for each arm rest, one of the props being at the rear and one at the front,'the two rear props being joined by a sliding bar resting on the second mentioned rails, a substantially horizontally disposed lever pivotally aiiixed to the mid portion of said second mentioned rails and extending rearwardly therefrom, the lever having on its underside a plurality of transverse recesses for selective engagement with the sliding bar, a coil spring anchored at one end to the rear member of the base frame and affixed at the other end to the lever to secure the same in a state of engagement with the sliding bar.
2. A chair of the kind described having a telescopic base frame including a front and a rear part, each mounted on ground wheels, a pair of rails connected to the front part of the base and extending therefrom at an angle, rearwardly, a pair of rails pivotally connected to the rear part of the frame and extending therefrom forwardly, the two pairs bein pivotally connected intermediate their respective ends, a transverse rod connecting the outer ends of the first mentioned rails, andanother connecting the outer ends of second mentioned rails, a webbing extending between the first and second mentioned rods, arm rests supported by two pairs of props, one
being pivotally afiixed to said first ,mentioned rails and the other pair being connected by a transverse slide bar resting on said second mentioned rails, an elongated lever disposed substantially horizontally and pivotally connected to said second mentioned rails, said lever having a plurality of notches for selective engagement with said transverse siide bar, and spring means connected to said lever and a part of said chair to pull the lever downwardly into engagement with .7 said transverse slide bar.
REFERENCES CITED The following references are of record in the fileoi this patent:
UNITED STATES PATENTS Number Name Date 1,248,931 Schuman Dec. 4, 1917 2,046,644 Marten July '7, 1936 FOREIGN PATENTS Number Country Date 532,038 Germany Aug. 6, 1931