preferred embodiments of this invention generally include two members , or legs , of the canopy which attach to the chair back support , or backrest , are of pipe or tubular construction and are slotted on their facing surfaces so that the legs may slide over , and be in snug relationship with , the back support member of the chair frame . a cross member , also of tubular construction , contacts but does not attach to , the two slotted legs at their ends opposite the slots , and a rod extends therethrough . the rod is threaded on at least one end and the threaded end extends through the wall of a leg member so that it can mate with a threaded cap which can be rotated at will . the opposite end of the rod is attached , or fastened , to the upper end of the other leg members as by bending the rod to extend into the other leg member . on applying tension on the rod by tightening the tension cap , the bent portion of the rod firmly by contact , grips the leg member and is thereby attached through the pressure , or tension applied . by tightening the threaded cap , the two leg members connected by the connecting member are forced against the ends of the connecting member and the connecting member is then held in any desired position . the connecting member is attached near its ends to two arm members extending outwardly therefrom in the same plane , the outwardly extending arm members terminating by attachment to a cross arm member , said outwardly extending arm members and said cross arm member forming a frame on which shading material such as plastic sheet or cloth is attached . the cross arm member and the two arm members can be constructed by bending arm construction material into a &# 34 ; u &# 34 ; shape so that the single piece forms the two arm members and the cross arm member and may be used to carry the shading material , or together with the connecting member attached to the two arms of the &# 34 ; u &# 34 ;, form a frame to which the shading material may be attached . since the frame is attached to the connecting member , when the connecting member is rotated , the frame is rotated and its end away from the connecting member is raised or lowered , the ease of rotation being adjusted by turning the threaded cap . polyvinyl chloride ( pvc ) which has been stabilized against deterioration by light , and especially against radiation from the sun , is the preferred material of construction for the framing arm members , but other materials such as polypropylene or aluminum may be used . pipelike , or tubular , materials of construction are required for certain members as herein described , but for other members solid or rod - like materials may be used . referring to a specific embodiment of the invention as depicted in fig1 there is shown a recreational chair 10 with the canopy of this invention mounted thereon . chair 10 is of conventional type having a back portion 11 , a seat area 12 and a leg - rest 13 hingably connected so that the chair may be folded for ease of carrying and transport . canopy 14 of this invention is mounted at the top of chair back 11 . details of the canopy construction are more clearly illustrated by reference to fig2 and 3 in conjunction with fig1 wherein like reference numerals refer to the same or equivalent elements in each drawing figure . canopy 14 includes a pair of mounting leg members 15 having cutaway portions forming slots 16 at their lower ends . members 15 are of tubular or pipe construction having an inside diameter sized to fit edges of the chair back support 11 . leg members 15 are held in a fixed and rigid attitude spaced apart a distance equal to the width of the chair back 11 by means of support bar 17 . each leg member 15 terminates at its upper end in an inwardly pointing end piece 18 of generally ell shape . disposed between the two inwardly pointing end pieces 18 is a tubular connecting member 19 with tee - shaped canopy frame base members 20 rotatably positioned between each end piece 18 and connecting member 19 . base members 20 are frictionally rotatable relative to each end piece 18 and are arranged to be locked or fixed at any position over a large arc . in one embodiment , the locking means may comprise a rod 21 extending axially through tubular connecting member 19 . rod 21 has threads 22 of a length sufficient to extend through the end of member 19 and end piece 18 , and has threaded tension cap 23 mated therewith . the opposite end of rod 21 bends downwardly into leg 15 as shown at 21a so that when cap 23 is rotated to increase the tension on rod 21 , bent end 21a is forced against end piece 18 of leg 15 by being drawn toward cap 23 ; bent end 21a is thereby attached by pressure to leg member 15 . fig4 shows another embodiment for attaching rod 21 to the end opposite tension cap 23 . in this embodiment rod 21 is threaded on both ends and the threaded ends each extend through connecting member 19 and through end pieces 18 . tension caps 23 and 23a are each mated to a threaded end of rod 21 . this embodiment supplies two tension caps and either or both simultaneously can be used to position the canopy 14 . also , instead of tension cap 23a , a threaded lock nut or cap ( not shown ) can be used to anchor rod 21 at the end opposite tension handle 23 , as can other anchor means so long as rod 21 does not significantly rotate as tension cap 23 is rotated . canopy 14 itself may comprise a u - shaped frame member 25 , the two ends of the u member fitting into and being attached to the canopy frame base members 20 . the stability of position and ease of rotation of frame 25 is regulated by tension handle 23 . frame 26 may rotate to touch either the front or back of the chair back rest , which provides for compact folding of the chair with the canopy attached thereto . as is best shown in fig2 frame 25 is preferably bent downwardly near its center at an small angle 28 , preferably on the order of about 30 degrees from the horizontal . alternatively , frame 25 may be bent in the form of a gentle , continuous arc . tension cap 23 allows rotational movement of frame 25 and locks the frame into any desired position such as is shown in dotted outline at 25a and 25b . a light screening material 26 , preferably of fabric form , is disposed over frame 25 . the screening material 26 may be fabricated in sleeve - like form to slip over frame 25 . alternatively , the screening material may be attached to the canopy frame by any convenient means , such as by sewing , zippers , or snaps . it is preferred to have the screening material attached by means which permit changing or replacement . conveniently the material will carry an adhesive or adhesive means 27 at least along its edges so that it will grip the canopy frame on contact , and be detachable at will . the material may also attach to connecting member 19 . materials of different colors and appearances may be substituted on the canopy frame . mesh screen material of a plastic such as nylon , polyethylene , polypropylene , or the like can be used . a mesh screen material is preferred as admitting a minor amount of sun rays which can be largely controlled by adjusting the angle of the canopy . parachute material and the like may be used . emblems , logos , trademarks , advertising , and the like may be displayed on the canopy .
a canopy provides sun protection for the occupant of a recreational chair . the canopy is slidably mountable on the chair back and can be positioned immediately to any desired angle by simple but effective tension applying means .