Combines open concave

The open concave is the open grate at the bottom of the cylinder. The earlier combines had small channel irons bolted to the bottom of the cylinder area against solid steel plate as did the K and F series. The l and M had the open grate to let the grain start dropping thru immediately to the raddle(conveyor) thus giving more capacity and area to start the separation process. The stalks_vines stayed in the cylinder chamber and were laid on top of the grain and finer particles as the were sent back to the fan, walkers, chaffer and sieve area(shoe). Kind of a pre-separation process and an enlarged concave area to work with for better threshing. I have owned both open and closed and the open is so much better.

Thanks for the info John.I was going to ask if the older combines can be converted into a open concave but I for forgot to ask in my first post. Does the rattle chain drop down lower in the open concaves or does the momentum throw the grain up to the rattle.

Merry Christmas! The rattle in the open system starts just behind the rock door under the open concave. The closed has to be thrown clear out of the cylinder on to the rattle. literature from the K_F and the l_M systems makes it much clearer with pictures. I do have this literature and can Email it if requested. K_F have one rattle chain, l_M have two rattle chains for the extra length under the open concave.

Sent Email info, it was returned for improper address.

Here is my Email John, thanks once again! dsfrey7771@msn.com