Patent US3571956A successfully refreshed from Google Patents.
US3571956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cable plow draft linkage
Assignee: Individual
•
Filing: 1968-04-16
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Granted: 1971-03-23
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Expires: 1988-04-16
Abstract
Abstract A versatile plow for burying cable in a furrow behind a tractor or as much as 5 and 1/2 feet beyond either side of the tractor and in a roadside ditch below the level of the tractor or in a roadside embankment abode the level of the roadway on which the tractor travels. Such wide lateral adjustment is provided by a special hitch block and such great range of vertical adjustment is provided by a special parallelogram linkage behind the hitch block. The hitch block places the parallelogram linkage in outboard position so that it can be lowered into a ditch at a distance to one side of the tractor.
Inventors
- 👤 Robert C Heiberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:59
CPC Classifications
E; E02; E02F; E02F5/00; E02F5/02; E02F5/10; E02F5/102
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
294 words
Cable plow apparatus comprising a track bar adapted for mounting in transverse position on the back of a tractor, a hitch block slidable on said track bar, a first cylinder and piston for shifting said hitch block along said track bar, a vertical hinge pin, means on said hitch block for mounting said hinge pin, a first pivot member mounted on said hinge pin for free swinging movement, a draft arm having horizontal pivot connection in its forward end with said pivot member, a second pivot member having horizontal pivot connection with the rear end of said draft arm, a cable laying paravane plowshare having vertical pivot connection with said second pivot member, a second cylinder and piston connected between said second pivot member and said plowshare for swinging said plowshare on said second pivot member, a linkage including said draft arm and said first and second pivot members for maintaining said vertical pivot connection of said plowshare in vertical position when said draft arm pivots up and down on said horizontal pivot connection in the forward end of the draft arm, said linkage including cylinder and piston means arranged for raising and lowering said plowshare in parallel movement to working positions at different levels in the ground, and said linkage including cylinders and piston means arranged to pivot said plowshare upward to inoperative position above the ground, said linkage further comprising a cylinder and piston connected between said first pivot member and said draft arm for pivoting said draft arm on said horizontal pivot connection in its forward end, and a cylinder and piston connected between said second pivot member and said draft arm for pivoting said second pivot member on said horizontal pivot connection in the rear end of the draft arm.
Claim 2
Dependent Claim
294 words
Cable plow apparatus comprising a track bar adapted for mounting in transverse position on the back of a tractor, a hitch block slidable on said track bar, a first cylinder and piston for shifting said hitch block along said track bar, a vertical hinge pin, means on said hitch block for mounting said hinge pin, a first pivot member mounted on said hinge pin for free swinging movement, a draft arm having horizontal pivot connection in its forward end with said pivot member, a second pivot member having horizontal pivot connection with the rear end of said draft arm, a cable laying paravane plowshare having vertical pivot connection with said second pivot member, a second cylinder and piston connected between said second pivot member and said plowshare for swinging said plowshare on said second pivot member, a linkage including said draft arm and said first and second pivot members for maintaining said vertical pivot connection of said plowshare in vertical position when said draft arm pivots up and down on said horizontal pivot connection in the forward end of the draft arm, said linkage including cylinder and piston means arranged for raising and lowering said plowshare in parallel movement to working positions at different levels in the ground, and said linkage including cylinders and piston means arranged to pivot said plowshare upward to inoperative position above the ground, said linkage further comprising a cylinder and piston connected between said first pivot member and said draft arm for pivoting said draft arm on said horizontal pivot connection in its forward end, and a cylinder and piston connected between said second pivot member and said draft arm for pivoting said second pivot member on said horizontal pivot connection in the rear end of the draft arm.
Claim 3
Dependent Claim
44 words
Apparatus as defined in claim 1, said track bar comprising a pair of vertically spaced upper and lower hollow box beams, said first cylinder and piston being disposed between said beams, and a removable anchor bar in said beams detachably connected with said cylinder.
Claim 4
Dependent Claim
22 words
Apparatus as defined in claim 1, said means for mounting said hinge pin comprising holes in said hitch block receiving said pin.
Claim 5
Dependent Claim
33 words
Apparatus as defined in claim 1, said means for mounting said hinge pin comprising an adjustable extension arm on said hitch block to position said hinge pin beyond either side of the tractor.
Claim 6
Dependent Claim
188 words
Plow apparatus comprising a vertical hinge pin adapted for mounting on a tractor hitch, a first pivot member mounted for free swinging movement on said pin, a lower arm having a forward end with horizontal pivot connect to said first pivot member, a second pivot member having horizontal pivot connection with the rear end of said arm, a plowshare having vertical pivot connection with said second pivot member, a cylinder and piston connected between said second pivot member and said plowshare for swinging said plowshare on said vertical pivot, an upper arm having a rear end with horizontal pivot connection to said second pivot member, an arm having horizontal pivot connections with forward end portions of said upper and lower arms, said last arm, second pivot member and upper and lower arms forming a parallelogram linkage for varying the vertical position of the plowshare in plowing, a variable length linkage connected between the forward end of said upper arm and said first pivot memBer, and a cylinder and piston arranged to adjust the length of said variable length linkage for raising and tilting the plowshare to inoperative position.
Claim 7
Dependent Claim
188 words
Plow apparatus comprising a vertical hinge pin adapted for mounting on a tractor hitch, a first pivot member mounted for free swinging movement on said pin, a lower arm having a forward end with horizontal pivot connect to said first pivot member, a second pivot member having horizontal pivot connection with the rear end of said arm, a plowshare having vertical pivot connection with said second pivot member, a cylinder and piston connected between said second pivot member and said plowshare for swinging said plowshare on said vertical pivot, an upper arm having a rear end with horizontal pivot connection to said second pivot member, an arm having horizontal pivot connections with forward end portions of said upper and lower arms, said last arm, second pivot member and upper and lower arms forming a parallelogram linkage for varying the vertical position of the plowshare in plowing, a variable length linkage connected between the forward end of said upper arm and said first pivot memBer, and a cylinder and piston arranged to adjust the length of said variable length linkage for raising and tilting the plowshare to inoperative position.
Claim 8
Dependent Claim
28 words
Apparatus as defined in claim 5, said variable length linkage comprising a toggle linkage, said last cylinder and piston means being arranged to fold and straighten said toggle.
Claim 9
Dependent Claim
36 words
Apparatus as defined in claim 5 including cylinder and piston means connected to said parallelogram linkage and arranged to raise and lower said plowshare in parallel movement to working positions at different levels in the ground.
Claim 10
Dependent Claim
214 words
Cable plow apparatus comprising a vertical hinge pin adapted for mounting on a tractor hitch, a first pivot member mounted for free swinging movement on said pin, a draft arm having a forward end with horizontal pivot connection to said first pivot member, a second pivot member having horizontal pivot connection with the rear end of said arm, a cable laying paravane plowshare having vertical pivot connection with said second pivot member, a cylinder and piston connected between said second pivot member and said plowshare for swinging said plowshare on said vertical pivot, a cylinder and piston connected between said first pivot member and a mid portion of said draft arm for pivoting the draft arm on said horizontal pivot connection on its forward end, and a cylinder and piston connected between said second pivot member and a mid portion of said draft arm for pivoting said second pivot member on said horizontal pivot connection with the rear end of the draft arm, upward pivotal movement of both the draft arm and second pivot member pivoting the plowshare upward to inoperative position above the ground and opposite pivotal movements of said draft arm and second pivot member raising and lowering said plowshare in parallel movement to working positions at different levels in the ground.
Claim 11
Dependent Claim
214 words
Cable plow apparatus comprising a vertical hinge pin adapted for mounting on a tractor hitch, a first pivot member mounted for free swinging movement on said pin, a draft arm having a forward end with horizontal pivot connection to said first pivot member, a second pivot member having horizontal pivot connection with the rear end of said arm, a cable laying paravane plowshare having vertical pivot connection with said second pivot member, a cylinder and piston connected between said second pivot member and said plowshare for swinging said plowshare on said vertical pivot, a cylinder and piston connected between said first pivot member and a mid portion of said draft arm for pivoting the draft arm on said horizontal pivot connection on its forward end, and a cylinder and piston connected between said second pivot member and a mid portion of said draft arm for pivoting said second pivot member on said horizontal pivot connection with the rear end of the draft arm, upward pivotal movement of both the draft arm and second pivot member pivoting the plowshare upward to inoperative position above the ground and opposite pivotal movements of said draft arm and second pivot member raising and lowering said plowshare in parallel movement to working positions at different levels in the ground.
Claim 12
Dependent Claim
103 words
The apparatus defined in claim 8, said tractor hitch comprising a track bar adapted for mounting in transverse position on the back of a tractor, said track bar comprising a pair of vertically spaced upper and lower beams, a hitch block slidable on said track bar and having a portion disposed between said beams, a vertical anchor bar removably mounted in said beams, and a horizontal cylinder and piston between said beams connected between said anchor bar and hitch block, said hitch block having a plurality of holes spaced apart lengthwise of said track bar for receiving vertical connector pins in selected positions.
Claim 13
Dependent Claim
27 words
Plow apparatus as defined in claim 9, said beams having a plurality of aligned vertical openings to receive said anchor bar in different positions along the beams.
Claim 14
Dependent Claim
73 words
Plow apparatus as defined in claim 9, including an extension arm having an outboard end extending beyond the side of the tractor and equipped with a hole to receive said vertical hinge pin for pulling said plowshare offset beyond the side of the tractor, the inboard end of said arm having spaced holes, and vertical pins in said spaced holes in said arm and hitch block securing said arm to said hitch block.
Claim 15
Dependent Claim
32 words
Plow apparatus as defined in claim 11, said extension arm being pivotally adjustable on said hitch block by placing one of said inboard pins in different ones of said hitch block holes.
Claim 16
Dependent Claim
47 words
Plow apparatus as defined in claim 11, said hitch block holes being arranged for the selective positioning of said extension arm to project beyond either the right or left side of the tractor when the hitch block is shifted to the corresponding end of said track bar.
Claim 17
Dependent Claim
94 words
A cable plow as defined in claim 8, said tractor hitch comprising a track bar in transverse position relative to the tractor, said track bar having a length less than the width of the tractor, a hitch block slidable on said track bar, and an extension arm on said hitch block having an outboard end projecting beyond said side of the tractor, said vertical hinge pin being mounted on said outboard end of said extension arm, said outboard end of said extension Arm being movable to a position within the width of the tractor.
Claim 18
Dependent Claim
37 words
A cable plow as defined in claim 14, said hitch block being elongated in the direction of said track bar, and means for pivotally mounting said extension arm selectively on the opposite ends of said hitch block.
Claim 19
Dependent Claim
41 words
A cable plow as defined in claim 15, said pivotal mounting means comprising a pair of holes in said extension arm, a plurality of pairs of holes in said hitch block, and a pair of pins for insertion in said holes.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |