whereby first auxiliary support arm 12 may be folded from its fully deployed position as shown in fig3 and fig1 over onto and together with main support arm 11 as illustrated in fig1 2 8 and 9 together with main support arm 11 in general parallel alignment with the sling 17 first auxiliary support arm 12 when fully deployed as shown in fig3 and 10 is locked in position by a releasable lock 22 for locking the first auxiliary arm 12 in its fully deployed position at angle u03b8 relative to main support arm 11 when first auxiliary support arm 12 is fully deployed at angle u03b8 relative to main support arm 11 the lower backside portion 23 is pivoted at pivot point 20 and is received within a slot 24 of end 13 which acts as a stop to hold the angle u03b8 at this point the locking link 25 is provided with a notched end 26 which drops down into slot 24 to lock arm 12 into position to unlock this locking arrangement the operator simply pulls upwardly on link 25 so that end 26 disengages from slot 24 and then the first auxiliary arm 12 may be folded to the right as seen in the figures to lie down flat together on and with main support arm 11 the angle u03b8 may be made adjustable for example see the embodiment shown in fig6 and 7 here the end 13 of main support arm 11 is provided with first auxiliary support arm 12 pivoted thereto in the same manner as the previous embodiments except the locking link 25 is eliminated and spring loaded.