US3757871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Minimum tillage agricultural implement
Assignee: Deere and Co
•
Filing: 1972-01-26
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Granted: 1973-09-11
•
Expires: 1992-01-26
Abstract
Abstract A combination disk harrow and chisel plow for effectively working the soil while leaving sufficient residue on the surface to prevent soil erosion and water run-off. The implement includes an adjustment for varying the effective working depth of the disk gangs with respect to the working depth of the chisel plows.
Inventors
- 👤 W Jackson
- 👤 J Maust
- 👤 D Honnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:11
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/655; A; A01; A01B; A01B49/00; A01B49/02; Y; Y02; Y02A; Y02A40/00; Y02A40/10; Y02A40/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
338 words
A minimum tillage agricultural implement comprising: a rear frame including a plurality of transverse frame bars; a plurality of chisel plow shank assemblies secured to the transverse frame bars in spaced relation to each other; a front frame including a pair of side frame members and a longitudinal center frame member; a pair of disk gang assemblies each having an outer portion mounted on one of the side frame members for pivotal movement in a plane parallel to the plane of the front frame and an inner end portion releasably and selectively secured to the center frame member in any one of a plurality of positions spaced along the length of the center frame member; means interconnecting the front and rear frames for relative vertical movement including a pair of upper and lower parallel links connected between each of the side frame members and the center frame member of the front frame and the forwardmost transverse frame member of the rear frame for pivotal movement about transverse axis; adjustable means acting between one of the front and rear frames and the parallel links connected between the side frame members of the front frame and the forwardmost transverse frame member of the rear frame for selectively establishing and maintaining the relative vertical positions of the front and rear frames; wheel means adjustably connected to the rear frame adjacent the forward portion thereof for supporting the two frames; means connected between the rear frame and the wheel means to vertically adjust the frames between a raised transport position and any one of a plurality of lowered working positions; and hitch means connected to the front of the front frame and extending forwardly therefrom for connection with a propelling vehicle, whereby the working depths of the shank assemblies and disk gangs can be simultaneously adjusted, the working depth of the shanK assemblies can be varied relative to the working depth of the disk gangs, and the angles of the disk gangs can be varied to vary the aggressiveness of the disks.
Claim 2
Dependent Claim
338 words
A minimum tillage agricultural implement comprising: a rear frame including a plurality of transverse frame bars; a plurality of chisel plow shank assemblies secured to the transverse frame bars in spaced relation to each other; a front frame including a pair of side frame members and a longitudinal center frame member; a pair of disk gang assemblies each having an outer portion mounted on one of the side frame members for pivotal movement in a plane parallel to the plane of the front frame and an inner end portion releasably and selectively secured to the center frame member in any one of a plurality of positions spaced along the length of the center frame member; means interconnecting the front and rear frames for relative vertical movement including a pair of upper and lower parallel links connected between each of the side frame members and the center frame member of the front frame and the forwardmost transverse frame member of the rear frame for pivotal movement about transverse axis; adjustable means acting between one of the front and rear frames and the parallel links connected between the side frame members of the front frame and the forwardmost transverse frame member of the rear frame for selectively establishing and maintaining the relative vertical positions of the front and rear frames; wheel means adjustably connected to the rear frame adjacent the forward portion thereof for supporting the two frames; means connected between the rear frame and the wheel means to vertically adjust the frames between a raised transport position and any one of a plurality of lowered working positions; and hitch means connected to the front of the front frame and extending forwardly therefrom for connection with a propelling vehicle, whereby the working depths of the shank assemblies and disk gangs can be simultaneously adjusted, the working depth of the shanK assemblies can be varied relative to the working depth of the disk gangs, and the angles of the disk gangs can be varied to vary the aggressiveness of the disks.
Claim 3
Dependent Claim
43 words
A minimum tillage implement as set forth in claim 1 wherein the hitch means is pivotally connected to the front frame, and spring means acting between the hitch and front frame yieldably maintains the frames substantially level when in the raised transport position.
Claim 4
Dependent Claim
106 words
A minimum tillage agricultural implement as set forth in claim 2 wherein the adjustable means includes an integral upwardly extending projection on the upper link of each of the pair of links connected between the side frame members of the front frame and the forwardmost transverse frame member of the rear frame, a pair of upstanding brackets rigidly secured to the forwardmost transverse frame member of the rear frame in alignment with the upwardly extending projections, and means acting between the upper end of each of the brackets and the upper end of the associated projection to selectively move the same toward and awayfrom each other.
Claim 5
Dependent Claim
72 words
A minimum tillage agricultural implement as set forth in claim 3 wherein each of the means acting between the upper ends of each pair of associated bracket and projection includes an elongated threaded rod having one end anchored to the upper end of one of the bracket and projection and an intermediate portion extending through a threaded bearing block secured to the upper end of the other of the bracket and projection.
References Cited (Backward Citations)
FR570933A
Cited
US1685278A
Cited
US3131775A
Cited
US3190366A
Cited
US3235013A
Cited
US3502155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |