Patent US222327A successfully refreshed from Google Patents.
US4091964A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cutoff pad for an air planter
Assignee: Landoll Corp
•
Filing: 1976-11-18
•
Granted: 1978-05-30
•
Expires: 1996-11-18
Abstract
Abstract A vertical rotating disc has perforated seed pockets which pick up individual kernels of seed from an air pressurized cavity of a planter housing. Air flowing through the perforated pockets creates a pressure differential which moves a kernel into each pocket as the pocket moves on an arcuate path upwardly through the cavity. The pocket then moves into axially confronting relation with a flat sealing surface of a resilient air cutoff pad which sealingly engages the seed disc to prevent escape of air and holds the seed in the pocket as the disc rotates further to bring the pocket to the lower part of the housing where the seed falls by gravity into the soil. The air cutoff pad is arcuate in shape and is held in place by a pair of screws. Thin sheets of plastic material are bonded to the front and back sides of the pad and stiffening material, such as plastic cement, is added to the radially outer edge of the pad. The added material stiffens the pad so that it substantially retains its shape during planting whereby the lodging of the seed in the seam between the radially outer edge of the pad and the housing is minimized or eliminated.
Inventors
- 👤 Paul H. Harrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:48
CPC Classifications
A; A01; A01C; A01C7/00; A01C7/04; A01C7/042; A01C7/044; A01C7/046; A01C7/0443
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
162 words
An air cutoff pad for an air planter of the type having a housing with a seed cavity to which bulk seed and pressurized air are supplied and coplanar axial facing sealing surfaces radially spaced from one another by a flat bottom arcuate recess terminating at a seed drop portion at the lower part of the housing and a vertical seed disc with circumferentially spaced seed pockets and a generally flat sealing face in axially abutting and sealing relationship with the sealing surfaces on the housing, said pad comprising: an arcuate body of resilient material having radially inner and outer cylindrically shaped peripherial sides, axially opposite flat sides, and circumferentially opposite ends, said pad being adapted to fit snugly in said recess with one of said flat sides in confronting relation to said sealing face of said disc and a separate layer of dense plastic bonded on said one flat side adapted for sealing engagement with said sealing face of said disc.
Claim 2
Dependent Claim
162 words
An air cutoff pad for an air planter of the type having a housing with a seed cavity to which bulk seed and pressurized air are supplied and coplanar axial facing sealing surfaces radially spaced from one another by a flat bottom arcuate recess terminating at a seed drop portion at the lower part of the housing and a vertical seed disc with circumferentially spaced seed pockets and a generally flat sealing face in axially abutting and sealing relationship with the sealing surfaces on the housing, said pad comprising: an arcuate body of resilient material having radially inner and outer cylindrically shaped peripherial sides, axially opposite flat sides, and circumferentially opposite ends, said pad being adapted to fit snugly in said recess with one of said flat sides in confronting relation to said sealing face of said disc and a separate layer of dense plastic bonded on said one flat side adapted for sealing engagement with said sealing face of said disc.
Claim 3
Dependent Claim
11 words
The pad of claim 1 wherein resilient material is foam plastic.
Claim 4
Dependent Claim
18 words
The pad of claim 1 wherein said ends are spaced circumferentially more than 90 degrees from one another.
Claim 5
Dependent Claim
11 words
The pad of claim 1 wherein said layer is polyurethane film.
Claim 6
Dependent Claim
11 words
The pad of claim 1 wherein said body is polyether foam.
Claim 7
Dependent Claim
11 words
The pad of claim 5 wherein said layer is polyurethane film.
Claim 8
Dependent Claim
35 words
The pad of claim 1 and further comprising a layer of relatively dense plastic on the radially outer peripherial side of said body increasing the axial stiffness of the radially outer portion of said pad.
Claim 9
Dependent Claim
31 words
The pad of claim 1 and further comprising a layer of relatively dense plastic material on a major portion of the axial side of said body opposite to said one side.
Claim 10
Dependent Claim
35 words
The pad of claim 8 and further comprising a layer of relatively dense plastic on the radially outer peripheral side of said body increasing the axial stiffness of the radially outer portion of said pad.
Claim 11
Dependent Claim
18 words
The pad of claim 9 wherein said pad in a non-compressed condition is axially thicker than said recess.
Claim 12
Dependent Claim
13 words
The pad of claim 9 wherein said body is made of plastic foam.
Claim 13
Dependent Claim
12 words
The pad of claim 1 wherein said axially opposite sides are parallel.
Claim 14
Dependent Claim
22 words
The pad of claim 1 wherein said layer of plastic on said radially outer peripheral side is a coating of plastic cement.
Claim 15
Dependent Claim
13 words
The pad of claim 13 wherein said body is made of plastic foam.
Claim 16
Dependent Claim
18 words
The pad of claim 14 wherein said pad in a noncompressed condition is axially thicker than said recess.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |