the present invention is an improved seed metering disc for a seed planter which provides for universal seed use . referring to fig1 and fig2 an exemplary improved universal seed metering disc 10 comprises a seed disc 20 and a seed retention plate 30 . seed disc 20 has a front side 41 and a backside 42 , wherein the front side has a plurality of grooved seed pockets 50 and seed cells 55 . the seed pockets 50 are generally radially situated around the front side 42 of the seed disc 20 . each of the seed pockets 50 comprise a channel which leads directly into a seed cell 55 . each channel may be round and smooth to facilitate seed movement within the seed pockets 50 . each seed cell 55 has a recess 66 , a seed delivery opening 67 and seed cell retention walls 68 . each seed cell 55 is further defined by seed retention plate 30 affixed to the seed disc 20 such as to form a backside of each seed cell 55 where the recess 66 ends at break 69 . seed retention plate 30 is substantially similar in shape and diameter as the seed disc 20 and is made from any suitable material , including a weather - safe durable material , such as a coated aluminum . the seed retention plate 30 can be affixed to the seed disc 20 by any appropriate fastening means , including a set of one or more fastening bolts 70 that pass through the front side 41 of the seed disc 20 and through the seed retention plate 30 where the bolts can be secured by one or more locking nuts . the locking nuts should be fastened tightly such as to provide contact or near contact between the seed disc 20 and the seed retention plate 30 , wherein the distance between seed disc 20 and seed retention plate 30 is small enough to prohibit seeds from sliding between the seed disc 20 and the seed retention plate 30 . in one embodiment , as shown in fig2 a gasket 80 , comprised of either sponge , foam , or other suitable material , is placed between the seed disc 20 and the seed retention plate 30 . the gasket assists in holding the seeds in the seed cells 55 by increasing the friction force which the seed must overcome in order to slide from the seed cell 55 . the gasket 80 further provides a means for ensuring contact or near contact between the seed disc 20 and the seed retention plate 30 , and fills any space therebetween . seeds stored in a seed reservoir of a planter are dropped onto the seed disc 20 which is at rotating in a vertical plane along a shaft which contacts and retains the seed metering disc 10 through the shaft hole 85 . in an embodiment , more than one seed metering discs 10 are used by dividing the planter into a set number of row units , connecting one seed metering disc 10 per row unit , and evenly delivering seeds from the seed reservoir to each of the row units . the seed disc 20 rotates at a set speed creating a centrifugal force which , along with a brush system as described in u . s . pat . no . 5 , 058 , 766 , forces the seeds into the seed pockets 50 . the rotational force pushes the seeds along the channel of the seed pockets 50 until the seeds reach the seed cells 55 . the seeds then fall individually , or in small seed packets , into the recess 66 of seed cells 55 and are retained within the seed cells 55 by the seed retention walls 68 and the seed retention plate 30 . smaller seeds that would otherwise slide out break 69 and out the backside 42 in the recess 66 of the seed cell 55 are held in place by the seed retention plate 30 . when the seed metering disc 10 reaches a fixed point in its rotation , the seeds are thrust from the seed cells 55 out the seed delivery opening 67 and into the corresponding crop row . while the present invention has been illustrated by the description of embodiments thereof , and while the embodiments have been described in detail , it is not the intention of the applicant to restrict or in any way limit the scope of the appended claims to such detail . additional advantages and modifications will readily appear to those skilled in the art . therefore , the invention , in its broader aspects , is not limited to the specific details and illustrative examples shown and described . accordingly , departures may be made from such details without departing from the spirit or scope of the applicant &# 39 ; s general inventive concept .
the present invention is a seed metering disc for the distribution and planting of various sizes of seeds . the seed metering disc is defined by a set of seed cells which can accommodate various seed sizes in that each cell is defined by a recess , seed cell retention wall , and seed cell retention plate .