21 has a plurality of strips 210 parallel to each other the second rectangular plate 22 comprises a frame 220 and a releasable plate 221 which has a hole therein for holding a gas container when the releasable plate 221 is removed the gas container may be laid across the frame 220 so as to perform a stabilizing function the rectangular plates 21 and 22 have downward peripheral flange 211 and 222 respectively there is a fixing plate 212 protruding from a lower portion of the flange 211 at both lateral sides of the first plate 21 with the second plate 22 having a similar fixing plate 223 each fixing plate 212 and 223 has a hole therein thus the first and second rectangular plate 21 and 22 may be pivotally linked by a bolt or rivet referring to fig1 and 3 the trolley has four legs 3 pivotally attached on each corner of the base plate 2 one pair of the legs 3 are attached with a pair of wheels 33 each leg 3 has an upper and a lower post 31 and 32 the upper post 31 being capable of receiving the lower post 32 and having a.