Patent ID: 8434604

Claim:
A reversing transmission comprising: a shaft; a holder sleeved on the shall with a plurality of spaced sliding notches throughout the wall of the holder and axially extending through an end of the wall; a spacing collar mounted on an outer circumference surface of the holder at the middle portion; a plurality of reversing members each comprising two spaced swing plates, wherein each of the swing plates is divided into two regions, one of the regions is formed with a group of spiral teeth, the groups of spiral teeth of the two swing plates are diagonally symmetrically arranged, the extending direction of teeth curves of the two groups of spiral teeth of each reversing member are consistent; and the reversing members are received in the corresponding sliding notches of the holder and the swing plates of each of the reversing members are distributed at opposite sides of the spacing collar; two gears each being annular shaped and comprising a group of spiral teeth with consistent teeth curves formed on the inner side for engaging with the groups of spiral teeth of the reversing members and cogs formed on the outer surface for engaging with an external toothed member for transmission power; and two covers mounted on two opposite ends of the holder to keep the reversing members in position; wherein a switch between the gears is executed when rotation of the shaft is reversed, and during the switch, currently engaged ones of the swing plates gradually descend relative to the shaft to drive an engaged one of the gears apart from the spacing collar until the engaged swing plates disengage from the engaged gear, meanwhile, non-engaged ones of the swing plates gradually elevate relative to the shaft to engage with the spiral teeth of a non-engaged one of the gears via the groups of spiral teeth of the non-engaged swing plates.