초록 ▼

A self cleaning sprocket for a roller chain comprising a circular disc having a plurality of outwardly extending teeth and between which are formed roller receiving pockets. At the base of each pocket extending radially inwardly therefrom are foreign material receiving niches which receive foreign m

A self cleaning sprocket for a roller chain comprising a circular disc having a plurality of outwardly extending teeth and between which are formed roller receiving pockets. At the base of each pocket extending radially inwardly therefrom are foreign material receiving niches which receive foreign material driven from the pocket by the engaging roller of the roller chain. The niches are U-shaped and extend from curved portions of the pocket which form the working faces of the sprocket. The sprocket and chain drive associated therewith is particularly well suited for use with an agricultural machine, such as a planter, which is used in a dirty and trashy environment.

대표청구항 ▼

An agricultural planter for planting seeds into a field, the planter comprising: a frame having a hitching means for coupling the frame to a means for towing the frame through a field; a plurality of individual planter units mounted on the frame for placing seeds in individual rows in a field; and o

An agricultural planter for planting seeds into a field, the planter comprising: a frame having a hitching means for coupling the frame to a means for towing the frame through a field; a plurality of individual planter units mounted on the frame for placing seeds in individual rows in a field; and operating means for operating the individual planter units, the operating means comprising a roller chain having a plurality of rollers operatively coupled to one another by a plurality of links the roller chain is operatively coupled between at least two chain sprockets, at least one of the sprockets being self cleaning and comprising a circular disc having a plurality of radially outwardly extending teeth defining a plurality of inwardly projecting pockets having curved surfaces forming roller receiving means for receiving the rollers and providing the working surface of the sprocket, a U-shaped niche above the bottom of the pocket extending radially inwardly from the roller receiving means defining a foreign material receiving means, the U-shaped niche extending across the circular disc and being sized to substantially prevent the rollers contacting the roller receiving means from entering the niche.