Extensible handle assembly
 An extensible handle assembly has a base seat, two outer pipes, two inner pipes, a press button, a grip, a cover plate, a positioning seat, two inner seats, two gears, two springs, two slide blocks, and two racks. Two sleeves are disposed in the positioning seat. Each sleeve receives the inner pipe. Each inner pipes is inserted in the outer pipe. Two link plate are disposed in the grip. The cover plate is disposed on the grip. A connection rod is inserted in the inner pipe. The connection rod has an upper end hooks the link plate. Each inner pipe has a lower through hole and a bottom slot. Each inner seat is inserted in the inner pipe to receive the gear, and the slide block. Each inner seat has a recess and a channel. Each gear has a center shaft inserted in the recess. Each slide block has a bottom notch engaging with the gear and an upper end hooked by a lower end of the connection rod. Each slide block receives a spring. Each rack is disposed between the inner pipe and the outer pipe. 
Y Y A
Y10T Y10T A45C
additional additional inventional
Cheng-Tsan
Chou