CA1091441A - Land levelling device - Google Patents
Land levelling deviceInfo
- Publication number
- CA1091441A CA1091441A CA331,149A CA331149A CA1091441A CA 1091441 A CA1091441 A CA 1091441A CA 331149 A CA331149 A CA 331149A CA 1091441 A CA1091441 A CA 1091441A
- Authority
- CA
- Canada
- Prior art keywords
- tractor
- arm
- dependent
- frame
- arms
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
- E02F3/80—Component parts
- E02F3/815—Blades; Levelling or scarifying tools
- E02F3/8157—Shock absorbers; Supports, e.g. skids, rollers; Devices for compensating wear-and-tear, or the like
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/627—Devices to connect beams or arms to tractors or similar self-propelled machines, e.g. drives therefor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Soil Working Implements (AREA)
- Agricultural Machines (AREA)
Abstract
ABSTRACT
A land levelling device for attachment to the front of a tractor to level a narrow path immediately in front of each tractor wheel so as to provide a smoother ride, parti-cularly when cross cultivating ploughed land. A frame with spring loaded dependent arms having V-shaped ground engaging blades at the ends thereof is pivotally mounted on the front of the tractor for movement between a ground engaging position and a raised transport position. As only a relatively narrow path is levelled the power requirements are low compared to a bulldozer-type of attachment.
A land levelling device for attachment to the front of a tractor to level a narrow path immediately in front of each tractor wheel so as to provide a smoother ride, parti-cularly when cross cultivating ploughed land. A frame with spring loaded dependent arms having V-shaped ground engaging blades at the ends thereof is pivotally mounted on the front of the tractor for movement between a ground engaging position and a raised transport position. As only a relatively narrow path is levelled the power requirements are low compared to a bulldozer-type of attachment.
Description
i~)9144 1 This invention relates to a land levelling device for use with a tractor or other farm implement. More parti-cularly this invention relates to a device especially adapted to level a narrow strip of land immediately in front of a tractor wheel.
There are, of course, many types of land levelling devices on the market or which have been developed for specific applications, including harrows, rollers and the like which are towed behind a powered vehicle such as a tractor, and blade devices which are normally mounted on the front of a powered vehicle. With any leve~ling device which is mounted behind the tractor there remains the problem that the ground over which the tractor is travelling has not yet been levelled and this can result in an extremely uncomfort-able ride for the driver as well as imposing severe strains on the vehicle suspension. The problem is particularly severe when a tractor is being used to cross cultivate ploughed or even ploughed and harrowed land. The transverse ridges left by the plough create a washboard effect which is extremely fatiguing for the driver as he is constantly bracing himself against the next bump. A blade attachment, such as a bull-dozer blade across the front of the tractor would, of course solve the problem of a rough ride, but such blades are expensive to produce and operate. Indeed it is rarely possible to attach a bulldozer blade to the front of a ; powered vehicle and use it to clear a smooth path for the vehicle and still have enough power available to be able to tow a cultivating implement or the like behind the vehicle as well. It is clear therefore that a bulldozer blade . . . .
` lV91~4:~
actually moves far more earth and the like than is actually required to provide a smooth ride for the tractor driver.
It is an object, therefore, of the present invention to provide a simple, relatively inexpensive attachment for mounting on the front of a tractor or the like which will smooth a pair of parellel, spaced narrow paths, each just sufficiently wide to permit passage of a tractor wheel, thus ensuring a relatively smooth ride for the driver.
Thus, by one aspect of this invention there is provided a land levelling device for attachment to a tractor forwardly thereof, comprising:
frame means having a pair of forwardly projecting parallel-ly spaced arms;
means to attach said frame to said tractor;
at least two arms pivotally supported from said frame and dependent downwardly therefrom;
ground levelling blade means rigidly mounted at the lower end of each said dependent arm; and means to pivot said blade means into and out of ground contact.
The invention will be described in more detail herein-after with reference to the drawings in which:
Figure 1 is an isometric view of one embodiment of the present invention, attached to a tractor;
Figure 2 is a side view of the device of Figure l;
Fiqure 3 is a plan view of the device of Figure 1: and Figure 4 is an isometric view of an alternative embodi-ment of the invention, attached to a tractor.
In Figure 1 there is shown a device of the present ~` 10~1~14~
invention attached to the front of a tractor 1 (shown in phantom). A frame 2, having a cross bar 3, a pair of parallel forwardly extending arms 4 and 5, and a pair of parallel rearwardly extending arms 6 and 7, is pivotally mounted on the front axle 8 of the tractor 1 at the outer ends of arms 6 and 7, via mounting brackets 9, on each side of the tractor motor, and pivot pins 10. Pivotal movement of frame 2 between a lowered operative position and a raised inoperative or travelling position is effected in any conven-tional manner as by means of one or more hydraulic cylinders 11and 12 pivotallymounted at one end thereof to brackets 13 and 14 on one or both sides of the tractor frame, and to suitable lugs 15, 16 on frame 2 at the other end thereof.
Downwardly dependent arms 17 and 18 are pivotally mounted at the forward ends of arms 5 and 6 respectively and provided with springs 19 and 20 biasing the ground engaging ends of arms 17 and 18 forwardly. V-shaped harrow-type blades 21 and 22 are secured to the ground engaging ends of arms 17 and 18. In the event that blades 21 or 22 strike a rigid obstruction arms 17 and 18 are moved rearwardly against the action of springs 19 and 20. Preferably, but not essentially, a slotted plate 23 is slidably secured between dependent arm 17 and arm S, and similarly between arm 18 and arm 4, to act as a stabilizer against twisting of the respective dependent arms relative to the frame.
It will, of course, be appreciated that the design of blades 21 and 22 is a matter of choice and that these blades may be of any selected length, depending upon the vehicle to , which they are attached. As seen most clearly in Figure 3 14~1 the length of the arms of blades 21 and 22, and the angle between them should be selected such that the width of the swept path created thereby is slightly greater than the width of the tractor tire 24 behind it. In the event that a tractor with dual rear wheels is employed, it may be preferable rather increasing the length of blades 21 and 22 to cover both wheels, to provide dual blades on each side of the tractor.
As the levelling path is relatively narrow, relatively little of the power available from the tractor is actually used to smooth the path, and consequently regular cultivating operations with a towed implement can be carried out without difficulty with the same sized tractor.
An alternative and preferred embodiment of the invention is illustrated in Figure 4. Frame members 30, 31 are securely bolted to front axle 8 on each side of the tractor motor and projecting substantially horizontally forwardly in a planar relationship. Adjacent the outboard ends thereof there is provided a substantially circular hole 32, 33 through which a bar 34 is inserted for angular rotation. Arms 17 and 18 are rigidly mounted on bar 34 and depend downwardly. Blades 21 and 22 are rigidly mounted at the lower ends of arms 17, 18 for ground engagement as described above. In order to position blades 21 and 22 in either a ground engaging position or a pivotally retracted position, a lever arm 35 is rigidly secured to bar 34 at a position intermediate holes 32 and 33 and pivotally connected to a hydraulic cylinder 11, mounted on one side of the tractor frame. Generally a single cylinder 11 is sufficient although it will be appreciated that a second cylinder 12 may be provided on the other side of the tractor .~ 10~
frame if required. Hydraulic cylinder 11 is actuable, utilizing power from the tractor, to move the upper end of lever arm 35 back and forth, thus pivotally turning bar 34 and blades 21 and 22 into and out of ground engagement respectively. Cylinder 11 also provides some resiliency, in the form of an accumulator, should the blades 21, 22 strike a rock or the like.
' _ 5 _
There are, of course, many types of land levelling devices on the market or which have been developed for specific applications, including harrows, rollers and the like which are towed behind a powered vehicle such as a tractor, and blade devices which are normally mounted on the front of a powered vehicle. With any leve~ling device which is mounted behind the tractor there remains the problem that the ground over which the tractor is travelling has not yet been levelled and this can result in an extremely uncomfort-able ride for the driver as well as imposing severe strains on the vehicle suspension. The problem is particularly severe when a tractor is being used to cross cultivate ploughed or even ploughed and harrowed land. The transverse ridges left by the plough create a washboard effect which is extremely fatiguing for the driver as he is constantly bracing himself against the next bump. A blade attachment, such as a bull-dozer blade across the front of the tractor would, of course solve the problem of a rough ride, but such blades are expensive to produce and operate. Indeed it is rarely possible to attach a bulldozer blade to the front of a ; powered vehicle and use it to clear a smooth path for the vehicle and still have enough power available to be able to tow a cultivating implement or the like behind the vehicle as well. It is clear therefore that a bulldozer blade . . . .
` lV91~4:~
actually moves far more earth and the like than is actually required to provide a smooth ride for the tractor driver.
It is an object, therefore, of the present invention to provide a simple, relatively inexpensive attachment for mounting on the front of a tractor or the like which will smooth a pair of parellel, spaced narrow paths, each just sufficiently wide to permit passage of a tractor wheel, thus ensuring a relatively smooth ride for the driver.
Thus, by one aspect of this invention there is provided a land levelling device for attachment to a tractor forwardly thereof, comprising:
frame means having a pair of forwardly projecting parallel-ly spaced arms;
means to attach said frame to said tractor;
at least two arms pivotally supported from said frame and dependent downwardly therefrom;
ground levelling blade means rigidly mounted at the lower end of each said dependent arm; and means to pivot said blade means into and out of ground contact.
The invention will be described in more detail herein-after with reference to the drawings in which:
Figure 1 is an isometric view of one embodiment of the present invention, attached to a tractor;
Figure 2 is a side view of the device of Figure l;
Fiqure 3 is a plan view of the device of Figure 1: and Figure 4 is an isometric view of an alternative embodi-ment of the invention, attached to a tractor.
In Figure 1 there is shown a device of the present ~` 10~1~14~
invention attached to the front of a tractor 1 (shown in phantom). A frame 2, having a cross bar 3, a pair of parallel forwardly extending arms 4 and 5, and a pair of parallel rearwardly extending arms 6 and 7, is pivotally mounted on the front axle 8 of the tractor 1 at the outer ends of arms 6 and 7, via mounting brackets 9, on each side of the tractor motor, and pivot pins 10. Pivotal movement of frame 2 between a lowered operative position and a raised inoperative or travelling position is effected in any conven-tional manner as by means of one or more hydraulic cylinders 11and 12 pivotallymounted at one end thereof to brackets 13 and 14 on one or both sides of the tractor frame, and to suitable lugs 15, 16 on frame 2 at the other end thereof.
Downwardly dependent arms 17 and 18 are pivotally mounted at the forward ends of arms 5 and 6 respectively and provided with springs 19 and 20 biasing the ground engaging ends of arms 17 and 18 forwardly. V-shaped harrow-type blades 21 and 22 are secured to the ground engaging ends of arms 17 and 18. In the event that blades 21 or 22 strike a rigid obstruction arms 17 and 18 are moved rearwardly against the action of springs 19 and 20. Preferably, but not essentially, a slotted plate 23 is slidably secured between dependent arm 17 and arm S, and similarly between arm 18 and arm 4, to act as a stabilizer against twisting of the respective dependent arms relative to the frame.
It will, of course, be appreciated that the design of blades 21 and 22 is a matter of choice and that these blades may be of any selected length, depending upon the vehicle to , which they are attached. As seen most clearly in Figure 3 14~1 the length of the arms of blades 21 and 22, and the angle between them should be selected such that the width of the swept path created thereby is slightly greater than the width of the tractor tire 24 behind it. In the event that a tractor with dual rear wheels is employed, it may be preferable rather increasing the length of blades 21 and 22 to cover both wheels, to provide dual blades on each side of the tractor.
As the levelling path is relatively narrow, relatively little of the power available from the tractor is actually used to smooth the path, and consequently regular cultivating operations with a towed implement can be carried out without difficulty with the same sized tractor.
An alternative and preferred embodiment of the invention is illustrated in Figure 4. Frame members 30, 31 are securely bolted to front axle 8 on each side of the tractor motor and projecting substantially horizontally forwardly in a planar relationship. Adjacent the outboard ends thereof there is provided a substantially circular hole 32, 33 through which a bar 34 is inserted for angular rotation. Arms 17 and 18 are rigidly mounted on bar 34 and depend downwardly. Blades 21 and 22 are rigidly mounted at the lower ends of arms 17, 18 for ground engagement as described above. In order to position blades 21 and 22 in either a ground engaging position or a pivotally retracted position, a lever arm 35 is rigidly secured to bar 34 at a position intermediate holes 32 and 33 and pivotally connected to a hydraulic cylinder 11, mounted on one side of the tractor frame. Generally a single cylinder 11 is sufficient although it will be appreciated that a second cylinder 12 may be provided on the other side of the tractor .~ 10~
frame if required. Hydraulic cylinder 11 is actuable, utilizing power from the tractor, to move the upper end of lever arm 35 back and forth, thus pivotally turning bar 34 and blades 21 and 22 into and out of ground engagement respectively. Cylinder 11 also provides some resiliency, in the form of an accumulator, should the blades 21, 22 strike a rock or the like.
' _ 5 _
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A land levelling device for attachment to a tractor forwardly thereof, comprising:
frame means having a pair of forwardly projecting parallelly spaced arms;
means to attach said frame to said tractor;
at least two arms pivotally supported from said frame, spaced from each other, and dependent downwardly therefrom;
ground levelling blade means rigidly mounted at the lower end of each said dependent arm and adapted to level a path in front of an associated wheel of said tractor; and means to pivot said blade means into and out of ground contact.
frame means having a pair of forwardly projecting parallelly spaced arms;
means to attach said frame to said tractor;
at least two arms pivotally supported from said frame, spaced from each other, and dependent downwardly therefrom;
ground levelling blade means rigidly mounted at the lower end of each said dependent arm and adapted to level a path in front of an associated wheel of said tractor; and means to pivot said blade means into and out of ground contact.
2. A land levelling device as claimed in claim 1 including bar means pivotally and axially mounted between said parallel arms on which said downwardly dependent arms are mounted.
3. A land levelling device for attachment to a tractor, comprising:
(a) a frame having a pair of forwardly projecting, parallelly spaced arms;
(b) means to pivotally attach said frame to said tractor forwardly thereof;
(c) an arm pivotally attached to and dependent from each said forwardly projecting arm, adjacent the forward end thereof;
(d) resilient means biasing a lower end of each said dependent arm forwardly;
(e) ground levelling blade means rigidly mounted at the lower end of each said dependent arm and adapted to level a path in front of an associated wheel of said tractor; and (f) means to pivot said frame from a first position in which said blade means contact the ground and a second position in which said blade means are raised out of contact with the ground.
(a) a frame having a pair of forwardly projecting, parallelly spaced arms;
(b) means to pivotally attach said frame to said tractor forwardly thereof;
(c) an arm pivotally attached to and dependent from each said forwardly projecting arm, adjacent the forward end thereof;
(d) resilient means biasing a lower end of each said dependent arm forwardly;
(e) ground levelling blade means rigidly mounted at the lower end of each said dependent arm and adapted to level a path in front of an associated wheel of said tractor; and (f) means to pivot said frame from a first position in which said blade means contact the ground and a second position in which said blade means are raised out of contact with the ground.
4. A land levelling device as claimed in claim 3 including:
(g) stabilizing means slidably mounted between each said dependent arm and its respective forwardly projecting arm.
(g) stabilizing means slidably mounted between each said dependent arm and its respective forwardly projecting arm.
5. A land levelling device as claimed in claim 1, 2 or 3 wherein said blade means are of selected width so as to level a path corresponding to the width of a tire of said tractor.
6. A land levelling device as claimed in claim 1, 2 or 3 wherein said forwardly projecting arms are spaced apart by a distance corresponding to the track width of said tractor.
7. A land levelling device as claimed in claim 3 or 4 wherein said resilient means comprise spring means between each said forwardly projecting arm and a respective said dependent arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA331,149A CA1091441A (en) | 1979-07-04 | 1979-07-04 | Land levelling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA331,149A CA1091441A (en) | 1979-07-04 | 1979-07-04 | Land levelling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1091441A true CA1091441A (en) | 1980-12-16 |
Family
ID=4114613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA331,149A Expired CA1091441A (en) | 1979-07-04 | 1979-07-04 | Land levelling device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1091441A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5007187A (en) * | 1989-08-07 | 1991-04-16 | Lloyd Mervin R J | Snow plow arrangement for moisture retention in a field |
| CN112036537A (en) * | 2020-08-04 | 2020-12-04 | 中国农业大学 | Three-dimensional path planning method and system for land scraper navigation |
-
1979
- 1979-07-04 CA CA331,149A patent/CA1091441A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5007187A (en) * | 1989-08-07 | 1991-04-16 | Lloyd Mervin R J | Snow plow arrangement for moisture retention in a field |
| CN112036537A (en) * | 2020-08-04 | 2020-12-04 | 中国农业大学 | Three-dimensional path planning method and system for land scraper navigation |
| CN112036537B (en) * | 2020-08-04 | 2023-12-26 | 中国农业大学 | Three-dimensional path planning method and system for land leveler navigation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |