Patent US3820609A successfully refreshed from Google Patents.
US3820609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rear-mounted blade
Assignee: Deere and Co
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Filing: 1972-06-29
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Granted: 1974-06-28
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Expires: 1992-06-29
Abstract
Abstract A rear-mounted blade having a mounting frame adapted for attachment to the three-point hitch arms of an agricultural tractor and a generally L-shaped main frame including a longitudinally extending portion connected at its forward end to the mounting frame for pivotal movement about a vertical axis, and a vertically extending portion rigidly fixed to and extending downwardly from the rear end of the longitudinal portion. A pivot pin extends longitudinally through the lower end of the vertical frame portion and has a blade carrier structure mounted thereon for pivotal movement about the axis of the pin, the carrier structure, in turn, having a transversely elongated blade pivotally connected thereto for relative movement about a generally vertical axis. Movement about the longitudinal axis of the pivot pin is imparted to the blade by means of a hydraulic cylinder disposed above the longitudinal frame portion and acting between the frame and one arm of a bell crank mounted thereon, the other arm of the bell crank being connected to the blade carrier structure by means of a vertically extending link.
Inventors
- 👤 C Trott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:52
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7622; E02F3/7627
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
253 words
Rear-mounted blade means comprising: a generally L-shaped reigid frame including a longitudinally extending portion adapted at its forward end for attachment to the rear of a tractor and a vertically extending portion fixed at its upper end to the rear of the longitudinal portion and extending downwardly therefrom; a longitudinally extending pivot pin received in the vertical portion of said frame; blade carrier structure; means mounting said blade carrier structure on said pivot pin for pivotal movement about the axis thereof; an elongated blade; means mounting said blade on said blade carrier structure for pivotal movement about a generally vertical axis; bell crank means mounted on the rear end of the longitudinal frame portion and having a first arm extending upwardly to an upper end disposed above the top side of the longitudinal frame portion, and a second arm extending longitudinally to an outer end disposed transversely outwardly from one side of the longitudinal frame portion; an extensible and retractable hydraulic cylinder disposed above the top side of the longitudinal frame portion and interconnecting said frame portion and the upper end of said first arm, said hydraulic cylinder being operative to pivot said bell crank means and thereby move the outer end of said second arm through a vertical arc; and a vertically extending link interconnecting the outer end of said second arm and said blade carrier structure to pivotally move the latter and thereby the blade about the axis of said pin in response to pivotal movement of said bell crank means.
Claim 2
Dependent Claim
253 words
Rear-mounted blade means comprising: a generally L-shaped reigid frame including a longitudinally extending portion adapted at its forward end for attachment to the rear of a tractor and a vertically extending portion fixed at its upper end to the rear of the longitudinal portion and extending downwardly therefrom; a longitudinally extending pivot pin received in the vertical portion of said frame; blade carrier structure; means mounting said blade carrier structure on said pivot pin for pivotal movement about the axis thereof; an elongated blade; means mounting said blade on said blade carrier structure for pivotal movement about a generally vertical axis; bell crank means mounted on the rear end of the longitudinal frame portion and having a first arm extending upwardly to an upper end disposed above the top side of the longitudinal frame portion, and a second arm extending longitudinally to an outer end disposed transversely outwardly from one side of the longitudinal frame portion; an extensible and retractable hydraulic cylinder disposed above the top side of the longitudinal frame portion and interconnecting said frame portion and the upper end of said first arm, said hydraulic cylinder being operative to pivot said bell crank means and thereby move the outer end of said second arm through a vertical arc; and a vertically extending link interconnecting the outer end of said second arm and said blade carrier structure to pivotally move the latter and thereby the blade about the axis of said pin in response to pivotal movement of said bell crank means.
Claim 3
Dependent Claim
55 words
The invention defined in claim 1 wherein said blade carrier structure comprises an upwardly opening box member loosely receiving the lower end of the vertically extending portion of the L-shaped rigid frame, the front and rear walls of said box member being pivotally mounted on the front and rear end portions, respectively, of said pin.
Claim 4
Dependent Claim
74 words
The invention defined in claim 2 wherein the bottom wall of said box member comprises a substantially horizontal plate extending forwardly from the front wall of said box member and rearwardly from the rear wall of said box member; and including support structure mounted on said blade and receiving the front and rear portions of said horizontal plate for pivotal movement of said plate relative to said support structure about a generally vertical axis.
Claim 5
Dependent Claim
183 words
Rear-mounted blade means comprising: a generally L-shaped frame including a longitudinally extending portion adapted at its forward end for attachment to the rear of the tractor, and an integral, vertical post rigidly fixed at its upper end to the bottom side of the rear end of the longitudinal portion; a pivot pin extending longitudinally through said post and having front and rear end portions extending forwardly and rearwardly, respectively, of said post; blade carrier structure including an upwardly opening box member loosely receiving the lower end of said vertical post, the front and rear walls of said box member being pivotally mounted on the front and rear end portions, respectively, of said pin, and the bottom wall of said box member including a substantially horizontal plate extending forwardly from the front wall of said box member and rearwardly from the rear wall of said box member; an elongated blade; and support structure mounted on said blade and receiving the front and rear portions of said horizontal plate for pivotal movement of said plate relative to said support structure about a generally vertical axis.
Claim 6
Dependent Claim
183 words
Rear-mounted blade means comprising: a generally L-shaped frame including a longitudinally extending portion adapted at its forward end for attachment to the rear of the tractor, and an integral, vertical post rigidly fixed at its upper end to the bottom side of the rear end of the longitudinal portion; a pivot pin extending longitudinally through said post and having front and rear end portions extending forwardly and rearwardly, respectively, of said post; blade carrier structure including an upwardly opening box member loosely receiving the lower end of said vertical post, the front and rear walls of said box member being pivotally mounted on the front and rear end portions, respectively, of said pin, and the bottom wall of said box member including a substantially horizontal plate extending forwardly from the front wall of said box member and rearwardly from the rear wall of said box member; an elongated blade; and support structure mounted on said blade and receiving the front and rear portions of said horizontal plate for pivotal movement of said plate relative to said support structure about a generally vertical axis.
Claim 7
Dependent Claim
153 words
The invention defined in claim 4 including means for pivotally moving said blade carrier structure and blade about the axis of said pin comprising bell crank means pivotally mounted on the rear end of the longitudinal frame portion and having a first arm portion extending upwardly to an upper end and a second arm portion extending longitudinally to an outer end; extensible and retractable means interconnecting the upper end of said first arm portion and the longitudinal portion of the frame, said extensible and retractable means being operative to pivot said bell crank means and thereby move the outer end of said second arm portion through a vertical arc; and a vertically extending link interconnecting the outer end of said second arm portion and said blade carrier structure to pivotally move the latter and thereby the blade about the axis of said pin in response to pivotal movement of said bell crank means.
Claim 8
Dependent Claim
226 words
Rear-mounted blade means comprising: a generally L-shaped rigid frame including a longitudinally extending portion adapted at its forward end for attachment to the rear of a tractor and a vertically extending portion fixed at its upper end to the rear end of the longitudinal portion and extending downwardly therefrom; a longitudinally extending pivot pin received in the vertical portion of said frame; blade carrier structure mounted on said pivot pin for pivotal movement about the axis thereof; an elongated blade; means mounting said blade on said blade carrier structure for pivotal movement about a generally vertical axis; bell crank means pivotally mounted on the rear end of the longitudinal frame portion and having a first arm portion extending upwardly to an upper end and a second arm portion extending longitudinally to an outer end; extensible and retractable means interconnecting the upper end of said first arm portion and the longitudinal portion of the frame, said extensible and retractable means being operative to pivot said bell crank means and thereby move the outer end of said second arm portion through a vertical arc; and a vertically extending link interconnecting the outer end of said second arm portion and said blade carrier structure to pivotally move the latter and thereby the blade about the axis of said pin in response to pivotal movement of said bell crank means.
Claim 9
Dependent Claim
226 words
Rear-mounted blade means comprising: a generally L-shaped rigid frame including a longitudinally extending portion adapted at its forward end for attachment to the rear of a tractor and a vertically extending portion fixed at its upper end to the rear end of the longitudinal portion and extending downwardly therefrom; a longitudinally extending pivot pin received in the vertical portion of said frame; blade carrier structure mounted on said pivot pin for pivotal movement about the axis thereof; an elongated blade; means mounting said blade on said blade carrier structure for pivotal movement about a generally vertical axis; bell crank means pivotally mounted on the rear end of the longitudinal frame portion and having a first arm portion extending upwardly to an upper end and a second arm portion extending longitudinally to an outer end; extensible and retractable means interconnecting the upper end of said first arm portion and the longitudinal portion of the frame, said extensible and retractable means being operative to pivot said bell crank means and thereby move the outer end of said second arm portion through a vertical arc; and a vertically extending link interconnecting the outer end of said second arm portion and said blade carrier structure to pivotally move the latter and thereby the blade about the axis of said pin in response to pivotal movement of said bell crank means.
Claim 10
Dependent Claim
28 words
The invention defined in claim 6 wherein said extensible and retractable means comprises an extensible and retractable hydraulic cylinder, said hydraulic cylinder being disposed directly above the frame.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |