Planting – Drilling – Having depositor feature
Reexamination Certificate
1999-11-10
2004-06-01
Pezzuto, Robert E. (Department: 3671)
Planting
Drilling
Having depositor feature
C221S211000
Reexamination Certificate
active
06742464
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to planters and more particularly to an automatic cleaning device for the seed absorbing needles of the planter which device can keep the needles always in clear and smooth condition without obstructing by filth or dirt.
Typical seed distributing system of a planter comprises a plurality of seed absorbing needle spacedly disposing under a transverse vacuum rack and communicating with a pneumatic pump on the top of the vacuum rack which is slidable on a pair of supports. The pneumatic pump provides intermittent air pressures to operate the seed absorbing needles to pick up the seeds from a seed container and then to drop them down into the earth through a plurality of planting tubes thereunder. This procedure is done alternately and repeatedly in cooperation with the arcuate sliding of the vacuum rack and the seeds will be planted regularly and spacedly in the earth. This type of seed distributing system has great disadvantage because it lacks of an automatic cleaning device therefore some of the seed absorbing needles may be obstructed by filth or dirt during the operation of the vacuum planter and causing vacancies of the seeds waiting to be replanted. Besides, a manual replantation of the seeds or a manual repairing of the seed absorbing needles may waste a great deal of time and labor that is not economical.
SUMMARY OF THE PRESENT INVENTION
The present invention has a main object to provide an automatic cleaning device for the seed absorbing needles of a vacuum planter which device uses the intermittently inverse operation of the pneumatic pump to alternately provide the inverse air pressure to clean the seed absorbing needles which will not be obstructed by filth or dirt.
Another object of the present invention is to provide an automatic cleaning device for the seed absorbing needles of a vacuum planter which device keeps the seed absorbing needles always reliable in order to prevent a manual replantation of the seeds and the manual repairing of the seed absorbing needles.
The present invention will become more fully understood by reference to the following detailed description thereof when read in conjunction with the attached drawings.
REFERENCES:
patent: 4019651 (1977-04-01), Starr et al.
patent: 4669922 (1987-06-01), Hooper et al.
patent: 5392722 (1995-02-01), Snipes et al.
patent: 6092609 (2000-07-01), Jeffrey et al.
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