577,594. Hand trucks. MARTIN, L. Sept. 5, 1944, No. 16952. [Class 108 (i)] An open truck which may be converted to a closed truck bv means of sides 5 attached by clips 6 and ends 7 held by hooks 9 on the handles 2 formed of bent inverted U- shaped bars and bolted to the platform 1 carries a tray 10 by means of sockets 11 engaging pins 12. The axle 14 is carried in brackets 15 while legs 16 of flat iron strip support the truck when released.