end of each chain 60 connected to the trolley 65 at the end of the gas spring 56 when the support assembly 14 is lifted up it will pivot around the pins 45 the chain 60 will pivot around the end of the arm 62 on the plate 55 as the support assembly pivots to the storage position as shown in fig1 and 11 the legs will initially pivot approximately 30 u00b0 to 45 u00b0 by the counterbalance force of the gas spring 56 the operator adds additional lift to rotate the legs past the horizontal position as the legs go over horizontal the lock pin 76 will move into the notch 74 in the plate 70 to lock the support assembly in the upside down position as shown in fig1 the support assembly 14 may be folded to a storage position as shown in fig1 by pivoting the lower section about a pivot pin 84 in this regard the uprights 30 are split into two sections 30a and 30b a notch 86 is provided in the end of section 30b a pin 88 mounted on the lower section 30a is biased by a spring 90 into engagement with the notch 86 the pin 88 is connected to the foot pedal 75 by a cable 79 and is released from the notch 86 at the same time that the foot pedal 75 is actuated to release the support assembly so that the support assembly can pivot.