GB2139066A - Connecting implements to tractor lift linkages - Google Patents
Connecting implements to tractor lift linkages Download PDFInfo
- Publication number
- GB2139066A GB2139066A GB08405998A GB8405998A GB2139066A GB 2139066 A GB2139066 A GB 2139066A GB 08405998 A GB08405998 A GB 08405998A GB 8405998 A GB8405998 A GB 8405998A GB 2139066 A GB2139066 A GB 2139066A
- Authority
- GB
- United Kingdom
- Prior art keywords
- linkage
- interconnecting
- collapse
- soil loosening
- shear
- 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.)
- Withdrawn
Links
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B61/00—Devices for, or parts of, agricultural machines or implements for preventing overstrain
- A01B61/02—Devices for, or parts of, agricultural machines or implements for preventing overstrain of the coupling devices between tractor and machine
Abstract
Interconnecting means for interconnecting the top hitch point of a towed agricultural implement to the top hitch point of a three point linkage of a towing vehicle is provided in which a collapsible linkage (30) is restrained against collapse by a shear pin interconnecting two relatively slidable linkage portions (31, 36). The uncollapsed position of the linkage is defined by abutment portions (33, 40) on each of the two linkage portions (31, 36) and suitably one (40) is adjustable so that the length of the linkage may be varied. The shear pin is arranged to fail on encountering a load in excess of a predetermined load which causes initial collapse of the linkage. On collapse the towed implement is allowed to pivot upwards about the lower hitch points so as to clear an obstruction whereupon a tensile load is automatically imposed upon the linkage causing the two linkage portions (31, 36) to return to their predefined positions thereby permitting a new shear pin to be positioned between the two portions. <IMAGE>
Description
SPECIFICATION
Improved soil loosening apparatus
This invention relates to a linkage for connecting a soil loosening apparatus to a towing vehicle and to a soil loosening apparatus including such a linkage.
In our prior British Patent No. 1582961 there is disclosed a chisel plough for loosening soil comprising a frame having two arms diverging rearwardly from a common apex, and a plurality of teeth depending from the arms of the frame. The teeth are secured to the arms by means permitting adjustment of the spacing between the teeth and with two pins, one of which is a shear pin to prevent damage to the teeth. Thus, in the event of a tooth meeting an immovable object such as a rock, the shear pin breaks and the tooth pivots about its thicker pivot pin. The shear pin then has to be replaced before ploughing can continue. The plough is connected in conventional manner to the three point linkage of a towing vehicle.
Other similar ploughs are disclosed in U.S. Patent
Nos. 3559747 and 3450212. However, in all the prior arrangements, the teeth tine or shanks, are protected by the provision of individual shear pins and the apparatus is connected direct to the three-point linkage of a towing vehicle.
According to the present invention there is provided means for interconnecting the top hitch point of a towed agricultural implement to the top hitch point of a three point linkage of a towing vehicle, the interconnecting means comprising a collapsible linkage restrained against collapse by means arranged to permit collapse upon a certain predetermined load being exceeded.
Preferably the linkage comprises two portions interconnected by a shear pin, the two portions including means defining the uncollapsed position of the linkage. One of the means may be adjustable to adjust the length of the linkage.
The invention also includes means for interconnecting the top hitch point of a towed agricultural implement to the top hitch point of a three point linkage of a towing vehicle, the inter connecting means comprising a collapsible linkage restrained against collapse by shear means, and means defining the uncollapsed position of the linkage, the arrangement being such that, on a certain predetermined load being exceeded, the shear means fails causing initial collapse of the linkage allowing the towed implement to pivot upwards about the lower hitch connections so as to clear an obstruction whereupon a tensile load is automatically imposed upon the linkage causing itto return to its predefined uncollapsed position allowing the implement once again to be restrained against collapse by re-set or replacement shear means.
According to another aspect of the present invention there is provided soil loosening apparatus including means for interconnecting the apparatus to a towing vehicle, the interconnecting means being as defined above.
The invention will now be described byway of example with reference to the accompanying drawings in which:
Figure lisa plan view of a preferred form of soil loosening apparatus;
Figure 2 is a rear elevation of Figure 1 with the rear blanking plate removed for clarity;
Figure 3 is a side elevation of the apparatus of
Figure 1;
Figure 4 is a front elevation of the headstock of the apparatus;
Figure 5 is a side elevation of a preferred tine;
Figure 6 is a rear elevation of the tine shown in
Figure 5;
Figure 7 is a top plan view of Figure 5;
Figure 8 is a perspective view of a first embodiment of collapsible top linkage of the present invention;
Figures 9a and 9b are a top plan and side elevation of the outer member for attachment to the towing vehicle;;
Figures lox and lob are a top plan and side elevation of the centre member of the top linkage for attachment to the soil loosening apparatus;
Figure lOc is a plan view of an adjustment plate for use with the first embodiment of collapsible top linkage;
Figure 11 is a perspective view of an alternative collapsible linkage in accordance with the invention;
Figures 12a, 12b and 12c are a top plan view, an end view and a side elevational view, respectively of a first member for connection to the agricultural implement;
Figures 13a, 13b and 13c are a top plan view, a side elevational view, and an end view respectively, of a second member;;
Figures 14a, 14b and 14e are a top plan view, an end view and a side elevational view, respectively, of an adjustment member; and
Figures 15a and 15b show the principle of operation of the invention.
In the drawings a soil loosening apparatus 1 comprises a frame 2, triangular in plan, with a leading apex 3. At each corner of the frame 2 is a tine receiving slipper sub-assembly 4 defined by a pair of spaced plates 5 and 6 secured together by means of collars 7,8 and 9. In each plate 5 and 6 is a hole 10 which are aligned with one another to receive a thick securing bolt (not shown) for securing a tine as will be explained below. The slipper sub-assemblies 4 are welded to the frame 2.
Disposed at the apex 3 of the frame 2 and positioned transverse thereto is a cross-bar 11 to which is secured a conventional headstock arrangement comprising upper and two spaced, lower tine points 12,13 and 14 positioned appropriatelyfor receiving the three-point linkage of a towing vehicle.
The frame 2 is strengthened by a trailing spar 15 extending rearwardly from the apex 3 to the centre of the rear member of the triangular frame 2. The assembled apparatus is completed by upper and lower blanking plates 16, 17 and a rear blanking plate 18.
In Figures 5,6 and 7 the preferred form of tine 19 is shown one of which is fitted in each tine slipper sub-assembly by a thick bolt (not showy). The tine 19 has an eye 20 at its upper end by means of which it may be manipulated into position, a plurality of securing holes 21 one of which, depending upon the desired draft, is aligned with respective holes 10 in the sub-assembly 4 to secure it thereto, and a forwardly curved free end 22 to which is attached a replaceable wear nose 23. The tine 19 has very little curvature and presents a thick forward edge, e.g. 75 mm. Adjacent the free end 22 of the tine 19 are secured a pair of wings 24, suitably inclined at an angle of 25 to the direction of travel each of the wings having two depending ribs 25,26 as shown.
In Figure 8 a first embodiment of collapsible linkage 30 of the present invention is shown which is used to connect the upper link point 12 to the linkage of a towing assembly suitably a SIM BA (Registered
Trade Mark) tool carrier. The linkage 30 comprises an outer member 31 consisting of two plates 32 welded together in spaced disposition at one end by means of upper and lower web connectors 33. At that same end the plates 32 are provided with a plurality of holes 34 for receiving a shear bolt (not shown) as will be explained. At the other end of the outer member are aligned holes 35 (which suitably have a bush therebetween as shown in Figure 9a) for conventional connection with the top linkage of the three point linkage of the towing vehicle.
Disposed between the plates 32 of the outer member 31 is an elongate inner, centre member 36 shown in detail in Figures 10a and lOb. The member 36 has a plurality of holes 37 intermediate the ends thereof for alignment with holes 34, a single hole 38 for connection to the upper link point 12 of the soil loosening apparatus at one end, and three holes 39 drilled at the other end between the longitudinal side edges thereof. The holes 39 receive upper and lower adjustment plates 40, one of which is shown in detail in Figure 10c.
In operation the three tines 19 of the soil loosening apparatus 1 are arranged in a V formation with one central leading tine at the apex 3 and two outer rear tines. This configuration is beneficial in the following ways:
(a) a greater overall distance between adjacent tines 19 allows easier passage of the worked ground through the apparatus, as compared to the conventional three tines in line configuration previously used for heavy application. This reduces the possibility of blockage;
(b) the central tine is allowed to completely lift and loosen the soil around itself before the rear tines come into work.This reduces the work required to be done by the rear tines to a greater extent than the increase in work undertaken by the leading tine, giving a net reduction in draft force compared to a conventional all in line soil loosening apparatus; (cj the net draft force reduction enables a wing 24 to be fitted to the central tine to give a level surface finish as compared to an all in line ripper, whose draft requirement is too great to enable a central wing to be fitted; and
(d) from a design strength viewpoint, considering the two outer tines primarily as cantilever loads on the frame 2, a triangular section which increases in strength as distance from the tine increases most closely fulfills strength requirements.
The soil loosening apparatus is attached to a towing vehicle suitably via a Simba Tool Carrier (Registered Trade Mark), by a collapsible linkage 30.
This linkage 30 is restrained from collapse by a shear bolt (not shown) the capacity of which is related to the design strength of the apparatus and tool carrier frames.
The principle of operation of the collapsible linkage 30 is as follows:- When the inner and outer members 36 and 31 are under working loads, the linkage is under compressive loading, the magnitude of which varies proportionately with the applied loads. At a certain predetermined load value related to the bolt shear strength and cross-sectional area, (the bolt extending through one of aligned holes 34 and 37) the bolt shears. This allows the inner section 36 to slide further into the outer 31, allowing the soil loosening apparatus 1 to pivot upwards about the lower hitch pins and the tine to clear obstructions.
The adjustable pair of plates 40 bolted to the rear of the inner section 36 are calculated to touch the outer section 31 upper and lower web connectors 33 when the appropriate shear bolt holes 34 and 37 are aligned. Raising the soil loosening apparatus out of work imposes a tensile load on the linkage 30 which pulls the inner section 36 out of the outer 31 again until the adjustable plates 40 touch the web connectors 33 as described, thereby aligning the desired holes 34 and 37 and enabling another shear bolt to be fitted in the desired hole (see Figure 8).
The plates 40 are adjustable to enable any set of shear bolt holes 34 and 37 to align, giving the linkage 30 a range of working length settings, this in turn can be used to vary the pitch of the apparatus.
If desired the adjustable plates 40 may be replaced with a screw thread and nut to perform the same operation as the plates, whilst also allowing for errors of drilling. The screw thread being infinitely adjustable, as compared to finite values associated with the plates 40.
In Figures 11 to 14 of the drawings a second embodiment of collapsible linkage 50 comprises a first member 51, for connection to a n an agricultural implement such as plough 52 (see Figures 15a and 15b), and means for connecting the first member 51 to the towing vehicle such as tool carrier 53: the connecting means consisting of a second member 54 and an adjustment member 55.
The first member 51 (see Figures 12a, 12b and 1 2c) has two spaced plates 56 interconnected at a trailing end by a tubular bush 57, which is adapted to receive the main pin (not shown) for connecting the linkage to the plough 52, and at a leading end by a tie 58 of square section. Disposed intermediate the ends of the member 51 are aligned holes 59 (only one shown) which receive a shear bolt (not shown) as will be explained.
The first member 51 cooperates with the second member 54 of the connecting means of the linkage 50 as shown in Figures 13a, 13b and 13c. The second member 54 comprises two side plates 60 interconnected by top and bottom plates 61 welded thereto.
The side plates 60 each have a bulbous trailing end 62 in which is formed a hole 63, the holes being aligned and adapted to receive the shear pin passing through aligned holes 59 of the first member 51. The top and bottom plates 61 each have four holes 64 towards the trailing end and a single hole 65 adjacent the leading end of the member, these holes 64 and 65, which are aligned in the respective plates 61, cooperate with the adjustment member 55.
The adjustment member 55 comprises a pair of spaced top and bottom plates 66 interconnected only at a leading end by a bush welded thereto: the bush 67 receives the main pin for connection to the tool carrier 53. The top and bottom plates 66 each have four holes 68 adjacent the trailing end thereof and a centrally disposed slot 69, the respective holes 68 and slots 69 being aligned.
In use, with particular reference to Figures 11 and 15a and 15b, the collapsible linkage 50 connect the upper points 70 and 71 of the three point linkages of the tool carrier 53 and the 3 tine heavy duty ripper plough 52. In order to alter the pitch of the ripper 52 relative to the tool carrier 53, the linkage 50 is lengthened or shortened accordingly, the ripper pivoting about its lower connection points on the tool carrier. This adjustment of the linkage is achieved, when connected into the ripper-carrier combination, by removing an adjuster bolt, which passes through cooperating holes 68 and 64, loosening a bolt which passes through slot 69 and hole 65, and lifting or lowering the tool carrier which has the effect of lengthening or shortening the linkage accordingly.When the desired pitch has been achieved, and a suitable set of holes 68 and 64 in the adjuster member 54 and the second member 55 have aligned, the adjuster bolt is replaced and both bolts are retightened. Hole alignment is made simply by the fact that, although the bolt passing through aligned slot 69 and hole 65 is loosened it stays in position, thus the linkage can pivot about that bolt to a limit governed by the fits of the main pins at each end.
If the ripper plough 52 encounters an immoveable object at depth, this can impose excessive stresses on certain parts of the ripper-tool carrier combination and therefore, the top linkage is calculated to shear and collapse before damage is incurred by the implement.
When in work, the linkage is under compressive loading which increases proportionately with the drawbar pull from the tractor. Above a certain value the shear bolt passing through aligned holes 59 and 63 will fail and the linkage 50 will collapse. This has the effect of allowing the ripper 52 to pivot upwards about the lower hitch pins, lifting the tines above an object as shown in Figure 15b. The angle of the tines also causes the implement to lift out of the ground which is noticeable to the driver. When this occurs, to reset the linkage, the ripper 52 is raised by the tool carrier. This puts the linkage 50 into tension, causing it to lengthen. The linkage is so designed to lengthen until the face B on tie 58 (see Figure 12a) hits face D on the end of the first member 51 (see Figure 13c).At this time the shear bolt holes 59 and 63 in the first member and the second member have once again aligned and a new shear bolt can be inserted in the unit. The implement is then returned to work as before.
Accordingly, the linkage of the present invention is an overall protection device in the ripper-tool carrier combination. It is adjustable to enable the correct pitch of the ripper to be achieved, and, when damage is likely to be incurred by the implement, the linkage will collapse. The linkage is then simply reset by lifting the implement out of the ground, and replacing the shear bolt.
Although the means arranged to permit collapse of the collapsible linkage has been particularly described as shear means, alternatively it could include resilient means in which case the linkage would reset automatically on removal of the loading.
However, preferably the linkage comprises two portions interconnected by a shear pin, the two portions each including means defining the uncollapsed position of the linkage, one of which means may be adjustable for altering the length of the linkage and hence the pitch of the plough.
Claims (14)
1. Means for interconnecting the top hitch point of a towed agricultural implement to the top hitch point of a three point linkage of a towing vehicle, the interconnecting means comprising a collapsible linkage restrained against collapse by means arranged to permit collapse upon a certain predetermined load being exceeded.
2. Interconnecting means according to claim 1 wherein the means arranged to permit collapse comprises shear means.
3. Interconnecting means according to claim 1 wherein the means arranged to permit collapse comprises resilient means.
4. Interconnecting means according to claim 1 or claim 2 wherein the linkage comprises two portions interconnected by a shear pin, the two portions each including means defining the uncollapsed position of the linkage.
5. Interconnecting means according to claim 4 wherein one of the portions includes an adjustment member for altering the length of the linkage.
6. Means for interconnecting the top hitch point of a towed agricultural implement to the top hitch point of a three point linkage of a towing vehicle, the interconnecting means comprising a collapsible linkage restrained against collapse by shear means, and means defining the uncollapsed position of the linkage, the arrangement being such that, on a certain predetermined load being exceeded, the shear means fails causing initial collapse of the linkage allowing the towed implement to pivot upwards about the lower hitch connections so as to clear an obstruction whereupon a tensile load is automatically imposed upon the linkage causing it to return to its predefined uncollapsed position allowing the implement once again to be restrained against collapse by re-set or replacement shear means.
7. Interconnecting means according to any one of the preceding claims wherein the collapsible linkage comprises an elongate body including two spaced arms defining at a first end a hitch connec tion for interconnection with the top linkage of the towing vehicle, an elongate member slidable relative to the elongate body and arranged to be interconnected to the top hitch point of the towed agricultural implement, means arranged to permit collapse upon the predetermined load being exceeded, said means defining the disposition of the elongate member relative to the body in use, and abutment means on the elongate member and the body arranged to abut when the relative positions thereof have been defined for use.
8. Interconnecting means according to claim 7 wherein the abutment means on the elongate member is adjustable along a part of the length thereof.
9. Soil loosening apparatus including an interconnecting means according to any one of claims 1 to 8 for connecting the soil loosening apparatus to a towing vehicle, the soil loosening apparatus comprising a chisel plough comprising a frame having two arms diverging rearwardly from a common apex and a plurality of tines depending from the frame.
10. Soil loosening apparatus according to claim 9 wherein each tine is adjustably positioned to enable the draft ofthe plough to be varied.
11. Soil loosening apparatus according to claim 9 or 10 wherein the tines each include a pair of laterally extending wings inclined to the direction of travel.
12. Soil loosening apparatus according to claim 11 wherein the wings are inclined at an angle of about 25 to the direction of travel.
13. An interconnecting means substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
14. Soil loosening apparatus including intercon
necting means according to claim 13 and substantially as hereinbefore described with reference to and as illustrated in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08405998A GB2139066A (en) | 1983-03-07 | 1984-03-07 | Connecting implements to tractor lift linkages |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB838306241A GB8306241D0 (en) | 1983-03-07 | 1983-03-07 | Improved soil loosening apparatus |
| GB08405998A GB2139066A (en) | 1983-03-07 | 1984-03-07 | Connecting implements to tractor lift linkages |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8405998D0 GB8405998D0 (en) | 1984-04-11 |
| GB2139066A true GB2139066A (en) | 1984-11-07 |
Family
ID=26285435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08405998A Withdrawn GB2139066A (en) | 1983-03-07 | 1984-03-07 | Connecting implements to tractor lift linkages |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2139066A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2318273A (en) * | 1996-10-15 | 1998-04-22 | Patrick Mccormick | Tractor linkage siabilizer |
| US6840333B2 (en) * | 2002-05-31 | 2005-01-11 | Todd Rieke | Multi-function implement for attachment to a tractor and the like |
| GB2424564A (en) * | 2005-03-29 | 2006-10-04 | Edward Arthur John Bagshaw | Locking device for a tractor coupling |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB557209A (en) * | 1942-02-27 | 1943-11-10 | Harry Ferguson Motors Ltd | Improvements in or relating to hitch means for connecting trailed devices to tractive vehicles |
| GB568928A (en) * | 1943-07-05 | 1945-04-26 | Duncan Macneill | A safety device for a hitched tractor and agricultural implement |
| GB576274A (en) * | 1944-01-07 | 1946-03-27 | Brown Tractors Ltd | Improvements in or relating to tractor-implement towing connections |
| GB584612A (en) * | 1945-01-10 | 1947-01-20 | Brown Tractors Ltd | An improvement in or relating to tractor-trailer couplings |
| GB626922A (en) * | 1947-01-31 | 1949-07-22 | Charles Rennie Mcleod | Improvements in and relating to tractor drawgear |
| GB791682A (en) * | 1953-04-21 | 1958-03-12 | Massey Harris Ferguson Ltd | Improvements in or relating to tractor-hitched implements |
| GB1600846A (en) * | 1977-05-04 | 1981-10-21 | Lely Nv C Van Der | Coupling member |
| GB1601163A (en) * | 1977-02-22 | 1981-10-28 | Lely Nv C Van Der | Agricultural implement |
-
1984
- 1984-03-07 GB GB08405998A patent/GB2139066A/en not_active Withdrawn
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB557209A (en) * | 1942-02-27 | 1943-11-10 | Harry Ferguson Motors Ltd | Improvements in or relating to hitch means for connecting trailed devices to tractive vehicles |
| GB568928A (en) * | 1943-07-05 | 1945-04-26 | Duncan Macneill | A safety device for a hitched tractor and agricultural implement |
| GB576274A (en) * | 1944-01-07 | 1946-03-27 | Brown Tractors Ltd | Improvements in or relating to tractor-implement towing connections |
| GB584612A (en) * | 1945-01-10 | 1947-01-20 | Brown Tractors Ltd | An improvement in or relating to tractor-trailer couplings |
| GB626922A (en) * | 1947-01-31 | 1949-07-22 | Charles Rennie Mcleod | Improvements in and relating to tractor drawgear |
| GB791682A (en) * | 1953-04-21 | 1958-03-12 | Massey Harris Ferguson Ltd | Improvements in or relating to tractor-hitched implements |
| GB1601163A (en) * | 1977-02-22 | 1981-10-28 | Lely Nv C Van Der | Agricultural implement |
| GB1600846A (en) * | 1977-05-04 | 1981-10-21 | Lely Nv C Van Der | Coupling member |
| GB1600845A (en) * | 1977-05-04 | 1981-10-21 | Lely Nv C Van Der | Coupling member |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2318273A (en) * | 1996-10-15 | 1998-04-22 | Patrick Mccormick | Tractor linkage siabilizer |
| GB2318273B (en) * | 1996-10-15 | 2001-03-07 | Patrick Mccormick | Improved stabilizer |
| US6840333B2 (en) * | 2002-05-31 | 2005-01-11 | Todd Rieke | Multi-function implement for attachment to a tractor and the like |
| GB2424564A (en) * | 2005-03-29 | 2006-10-04 | Edward Arthur John Bagshaw | Locking device for a tractor coupling |
| GB2424564B (en) * | 2005-03-29 | 2009-08-19 | Edward Arthur John Bagshaw | Hydraulic lifting-arm locking device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8405998D0 (en) | 1984-04-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |