Patent ID: 8070182

Claim:
A hand truck comprising: a pair of telescopic handles ( 13 ); a ledge ( 10 ) comprising a rear well ( 11 ) and a cavity ( 12 ) further behind the well ( 11 ) and open to a rear end; a fastening device ( 30 ) comprising a rear quick release ( 32 ) and a front fastening element ( 31 ); a locking device ( 20 ) comprising a hollow first section ( 21 ) including an opening ( 212 ) on either side, a hollow second section ( 22 ) releasably put on a front portion of the first section ( 21 ), the second section ( 22 ) including an opening ( 222 ) on either side, the openings ( 222 , 212 ) being in registration to each other, a block member ( 23 ) retained in the first section ( 21 ) and including a transverse channel ( 231 ) aligned with the openings ( 212 , 222 ) and the cavity ( 12 ), a lock pin ( 24 ) slidably disposed in the cavity ( 12 ), the openings ( 212 , 222 ), and the channel ( 231 ) to lock the first and second sections ( 21 , 22 ), the lock pin ( 24 ) having a projection ( 241 ) at one end in the channel ( 231 ), a spring depressible shuttle member ( 25 ) disposed in the first section ( 21 ) and including a hook ( 251 ) partially disposed in the block member ( 23 ), and an inclined slot ( 252 ) in the hook ( 251 ) with the projection ( 241 ) disposed at a blind end of the slot ( 252 ), and an actuation rod ( 27 ) releasably secured to the shuttle member ( 25 ), the actuation rod ( 27 ) being retained in a rear portion of the first section ( 21 ); a trunk ( 40 ) including a rear lock ( 41 ) adapted to releasably dispose in the well ( 11 ); and two wheels ( 15 ) at two rear bottom corners of the ledge ( 10 ); wherein in an operating position the first section ( 21 ) is secured to the fastening element ( 31 ); and wherein after detaching the fastening element ( 31 ) from the first section ( 21 ), the actuation rod ( 27 ) can be pushed to further move the hook ( 251 ) into the block member ( 23 ) with the projection ( 241 ) moving to an open end of the slot ( 252 ) to completely dispose the lock pin ( 24 ) in the channel ( 231 ) so as to unlock both the first and second sections ( 21 , 22 ).