CA1093372A - Coupling mechanism for agricultural trailer units - Google Patents
Coupling mechanism for agricultural trailer unitsInfo
- Publication number
- CA1093372A CA1093372A CA299,332A CA299332A CA1093372A CA 1093372 A CA1093372 A CA 1093372A CA 299332 A CA299332 A CA 299332A CA 1093372 A CA1093372 A CA 1093372A
- Authority
- CA
- Canada
- Prior art keywords
- towbar
- carrier
- locking
- locked
- locking lever
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60D—VEHICLE CONNECTIONS
- B60D1/00—Traction couplings; Hitches; Draw-gear; Towing devices
- B60D1/24—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions
- B60D1/36—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions for facilitating connection, e.g. hitch catchers, visual guide means, signalling aids
- B60D1/40—Traction couplings; Hitches; Draw-gear; Towing devices characterised by arrangements for particular functions for facilitating connection, e.g. hitch catchers, visual guide means, signalling aids involving a temporarily extensible or alignable member
-
- 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
- A01B59/00—Devices specially adapted for connection between animals or tractors and agricultural machines or implements
- A01B59/04—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor
- A01B59/042—Devices specially adapted for connection between animals or tractors and agricultural machines or implements for machines pulled or pushed by a tractor having pulling means arranged on the rear part of the tractor
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Zoology (AREA)
- Soil Sciences (AREA)
- Environmental Sciences (AREA)
- Agricultural Machines (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to coupling mechanism for agricultural trailer units. The mechanism comprises, at its front end, a towbar fitted with a coupling element and the towbar is adapted to move longitudinally and transversely within a range defined by a guiding device, and to be locked in a central position. In accordance with the invention, the guiding device consists of a guide part rigidly attached to the towbar and spaced laterally therefrom. It also includes a carrier, the outer end of which is mounted pivotably upon the free end of the guide part and which, when the towbar is in a locked position, projects therebeyond to the other side thereof, where it is mounted pivotably upon a frame part forming a part of the trailer unit.
The invention relates to coupling mechanism for agricultural trailer units. The mechanism comprises, at its front end, a towbar fitted with a coupling element and the towbar is adapted to move longitudinally and transversely within a range defined by a guiding device, and to be locked in a central position. In accordance with the invention, the guiding device consists of a guide part rigidly attached to the towbar and spaced laterally therefrom. It also includes a carrier, the outer end of which is mounted pivotably upon the free end of the guide part and which, when the towbar is in a locked position, projects therebeyond to the other side thereof, where it is mounted pivotably upon a frame part forming a part of the trailer unit.
Description
The in~ntion relates to a coupling rnechanism for agricultural trailer units. More specifically, the invention rela-tes to such a mechanism comprising, at i-ts front end, a tow-bar fitted with a coupling element, the said towbar beiny adapted to move longitudinally and transversely wlthin a range defined by a guiding device, and to be locked in a central position.
A coupling mechanism of -this kind is already known from German Utility Model 73 26 989. Thi~ mec~an.ism has an elonyate~, trapezoidal frame arranged to pivot in a vertical plane on the relevant trailer uni-t, and it is tranversed longitudinally by the towbar. In the simplest form of the said coupling mechanism, the guiding device consists of two guide paths arranged within the frame and a guide part mounted pivotably at the front end of the frame and equipped with guide rollers, the towbar being adapted to be locked in its central position b~ means of a lock-ing mechanism located at the rear end of the frame.
The towing device in accordance with the invention, is intended to simplify considerably the process of coupling a trailer unit to a tractor, it being sufficient to move the : tractor, approximately in the direction of the coupling mechanism, : 20 towards the trailer unit to be coupled, until the tractor coupling is located within the range o~ ~ovement of the coupling element of the trailer coupling mechanism. However, this is.quite easy to ùo, even if neither the tractor coupling nor the coupling nor the coupling mechanism on the trailer unit can be seen from ;~ the driverls seat of the tractor.
ven in its simplest form, the known coupling mechanism has the considerable ùlsadvantage of belng highly complex and expensive. Another disadvantage is that the elongated frame of the coupling mechanism prevents the trailer unit from being ~30 locateù as closely as possible to the tractor, which is desirable in the case of certain ~trailer units such as drilling machines, ~: :
' ~ ' ~33~
for example, or, if -this d.isadvantage is overcome by usiny a towbar which, in its central locked position, projects only slightly in a forward direction from the frame, then i-t restricts the turning radius of the train to an extent such that very wide turning areas mus-t be lef-t free at: each end of the field wher the sald train is in opera-tion.
Now it is the purpose of the invention -to achieve, by subs-tantially simpler means, the ability of known mechanisrn to facilitate -the coupling of a trailer unit to a -tractor or to a preceding trailer unit.
According to the invention, -this purpose is achieved in that the guiding device consists of a guide part rigidly attached to the towbar and spaced laterally therefrom, and of a carrier, the outer end of which is mounted pivotably upon the free end of the said guide part, and which, when the towbar is in the locked position, projects therebeyond to the other side, where it is arranged pivotably upon a frame par-t forming a part of the trailer unit.
This arrangement makes it possible to keep the frame of the coupling mechanism very short, as seen in the direc-tion of travel, or the said frame may consist of a single carrier arranged to pivot in a vertical plane upon the frame of the trailer unit to be coupled. Furthermore, in the case of single-axle trailer units, no separate frame is required for the coup-ling mechanism. Instead, the frame part upon which the carrier of the guiding device is arranged to pivot, may be included in the frame of the unit. The turning radius of the tractor and trailer unit is then determined merely by the lenyth of the tow-bar, since the length of the frame of the known coupling mechanism is thus eliminated.
According to one preferred example of embodiment of the invention, a locking part is -fitted to the towbar and a locking :
3~3~7~
lever is mounted pivotably upon -the frame ~ar-t and has a pro-jection adapted to move over sald loc~incJ part. The said locking lever is connected to a resllient elemen-t ac-tiny in the direction of the said locking part, the range over which the said locking lever pivots being restricted, in the forwardly directed position and against the -tension of said resilient element, by a stop. The front of the said projection has a surface sloping obliquely Eorwards. This is a simple way of providing fully automatic locking of the towbar, so that the driver needs to leave his seat only once, -to carry cut the actual coupllng, i.e. to connect -the -tractor coupling element to the coupling mechanism.
If the coupling element on the towbar, when the latter is in its locked position, is loca-ted upon the centreline run-niny, when the train is moving in a straigh-t line, forwardly between the two bearings on the carrier, then the -towbar is safely guided, after the coupling operation, in its locked position, when the tractor is moved back. This is improved still further by the provision of a stop which limits the extent to which the carrier can pivot to an angle of 60 in relation to its initial locked position. This is to ensure that even a force produced by moving the tractor back, and acting obliquely in an outward direction upon the said carrier, cannot pivot the latter into an outward position in which the towbar would not be locked. If the tractor and a unit already coupled thereto, is moved back in an oblique direction towards a trailer unit to be coupled, then, after the coupling operation, the tractor need be moved only a short distance forwards un-til the carrier of the coupling mechanism bears against the stop. Since in this position, both the towbar coupling element and the guide-ar-t bearing must be located in front of the central area of the coupling mechanlsm, the towbar will be moved safely into its :; :: :
:: : `
~33~
loc~sed posi'ion when -the backward movement takes place.
In order to prevent automatic release of the locking lever from the locking part during travel at high speeds over uneven ground, provision is made, according to ~he invention, ~or the locking lever to be locked additionally, by means of a pin, to the carrier and the towbar, when the latter is in its locked position. In this case, a particularly stable and reliable design is obtained, in that the locking lever is located above both the carrier and the towbar and ~is connected to, and secured against rotation in relation to, a second locking lever of the same kind and in the same position below -the carrier and the tow-bar, with the locking part projecting through the towbar.
If a handle projecting freely in an upward direction is secured to locking lever located above the carrier and the towbar, this provides the additional advantage of easy and con-venient actuation of the locking lever, or levers, during un-coupling of the trailer unit.
In accordance with a specific embodiment of-the invention, a coupling mechanism for agricultural trailer-units comprises: a coupling element movable within aspecific range and mounted at one end of a towbar; said towbar being adapted to be locked in a towing position by means of a spring loaded lockingimeans, said towbar bein~
connected, at the other end thereof, to one end o~ a guide part, the other end of said guide part being pivotably connected to one end of a carrier, the one end of said carrier projecting from said towbar towards said guide part when the mechanism is loc~ed in said towing position, characterized in that the one end of the towbar comprises the forwardly projecting end thereof; and in that the said towbar is secured rigidly to the guide part, and the locking ~ 4 -B
-o~ ~ q~
means is in the form of a pivotably arranged locki.ng lever adapted to be locked by means of a locking part, the said locking lever comprising, for locking purposes, a projec-tion and a surface running obliquely outwards against the action of a resilient element, and the pivoting range of said locking lever being limited, by a lever stop, to a position in which the said surface of the projection comes into contact with the locking part when the coupling element is moved into the locked towiny position.
The invent.ion is expla.ined in greater detail hereinafter in conjunction with the drawing attached hereto, wherein:
FIGURE 1 is a plan view of the coupling mechanism according to the invention in the locked position:
FIGURE 2 is a section along the line A-B through the same coupling mechanism, and FIGURE 3 is a plan view of the same coupling mechanism with the lock released.
The coupling mechanism comprises a towbar 1 equipped at its front end w~th a coupling element 2 and with its rear end connected to a guiding device 3. The latter consists of a forked guide part 4 welded to tow-bar 1 and spaced laterally therefrom, and of a carrier 5, one end of which is arranged to pivo-t in a bearing 6 at the free end of guide part 4. In the locked position shown in Fig. 1, carrier 5 extends to the other side - 4a -~ILV~V~D f ~o beyond towbar 1, -the other encl of the said carrier being also pivotable in a bearing 7 located in a frame part 8, the latter being connected in any known manner, not shown, to the trailer unit to be coupled up. In this case, coupling element 2 is located exactly upon centreline 10 which passes, when the train is running in a straight line, in a forward direction between bearings 6 and 7 of carrier 5.
Furthermore a locking par-t 11 is secured to towbar 1, the said part projecting from the towbar on both sides and being located, when the mechanism is in the retrac-ted posi-tion, close to carrier 5, so that the said towbar cannot be pivoted rear-wardly beyond carrier 5. Mounted ro-tatably in frame paxt 8, behind towbar 1 is a pin 12 which projects on both sides from frame par-t 8, a forwardly projecting locking lever 13 being secured, on each side of the frame, to the projecting ends of said pin. The front end of each of the said locking levers has projection 14 adapted to pivot over the outwardly projecting ends of locking part 11. In order to prevent locking levers 13 : from pivoting inwardly towards bearing 7 of carrier 5, they are connected together, above frame part 8 by a s-top 15. A
resilient element 16 is secured to the each projecting end of the stop, the other ends of these elements being secured to frame part 8 and thus applying to locking levers 13 a force causing them to bear against locking part 11 and stop 15.
In order to achieve, during the locking operation, ~automatic return of locking lever 13 against the force of res-ilient element 6, the front end of each locking lever 13 is provided with a surface 17 which slopes obliquely in a forward direction. Also~secured to upper locking lever 13 is a handle 18 projec-ting freely upwards. For the purpose of securing : towbar 1 additionally in its locked position, holes 19 are located ln the lower~part of the said towba~, halfway along 33~7~
carrier 5, and in lockiny levers 13. When towbar :L is in its locked position, locking pin 20 is inserted into holes 19.
When this lockin~ pin is not in use, it may be inserted into sleeve 21 welded to frame part 8. Finally, a stop 22 is pro-vided in front of bearing 7 in carrier 5. As shown in Fig. 3, this stop restricts the range over which carrier 5 may pivot from its locked position to an angle~ of 60.
The procedure for coupling a trailer unit to a tractor is as follows:
The tractor is first moved towards the coupling mechanism until the trailer coupling thereof is located wi-thin the range of movement 23 of coupling element 2, indicated in do-tted lines in Fig. 3. Since -this covers a relatively large area, it is quite possible for the tractor driver to accomplish this maneuvre, even when the closeness of the -tractor and the trailer unite prevents him from seeing -the coupling member from his seat on the tractor.
Locking pin 20 is then removed from holes 19, upper locking lever 13 is pivoted rearwardly until its projection 1~, and therefore also projection 1~ of the lower locking lever, are released from locking part 11, and towbar 1 is pulled forward un-til coupling element 2 can be coupled to the tr~iler coupling on the tractor. Since the tractor wlll relatively located centrally and straight ahead oE the coupli.ng mechanism, the tractor, with the trailer unit, should always be driven a short distance straight ahead, so that the coupling mechanism may assume the extended configuration shown in Fig. 2. This brinys carrier 5 up against stop 22, while bearing 6 and coupling elemcnt 2 are located exactly upon the centre line.
The tractor is then moved back, causing towbar 1 and guide part ~ to pivot in the direction of arrow 2~, and carrier 5 in the direction arrow 25. Towards the end of these movements, ' ~. .
~LV~3~7~
lockinc~ part 11 lmpinges upon oblique surfaces 17 o:E locklng levers 13 which are therefore forcecl back ~gainst the action of resilient elements 16, until projections 1~ are in -front of the said locking part and are pulled into the locked position, shown in Fig. 1, by resilient elements 16. Lockiny pin 20 may now be reinserted into holes 19 which are now aligned with each other.
A coupling mechanism of -this kind is already known from German Utility Model 73 26 989. Thi~ mec~an.ism has an elonyate~, trapezoidal frame arranged to pivot in a vertical plane on the relevant trailer uni-t, and it is tranversed longitudinally by the towbar. In the simplest form of the said coupling mechanism, the guiding device consists of two guide paths arranged within the frame and a guide part mounted pivotably at the front end of the frame and equipped with guide rollers, the towbar being adapted to be locked in its central position b~ means of a lock-ing mechanism located at the rear end of the frame.
The towing device in accordance with the invention, is intended to simplify considerably the process of coupling a trailer unit to a tractor, it being sufficient to move the : tractor, approximately in the direction of the coupling mechanism, : 20 towards the trailer unit to be coupled, until the tractor coupling is located within the range o~ ~ovement of the coupling element of the trailer coupling mechanism. However, this is.quite easy to ùo, even if neither the tractor coupling nor the coupling nor the coupling mechanism on the trailer unit can be seen from ;~ the driverls seat of the tractor.
ven in its simplest form, the known coupling mechanism has the considerable ùlsadvantage of belng highly complex and expensive. Another disadvantage is that the elongated frame of the coupling mechanism prevents the trailer unit from being ~30 locateù as closely as possible to the tractor, which is desirable in the case of certain ~trailer units such as drilling machines, ~: :
' ~ ' ~33~
for example, or, if -this d.isadvantage is overcome by usiny a towbar which, in its central locked position, projects only slightly in a forward direction from the frame, then i-t restricts the turning radius of the train to an extent such that very wide turning areas mus-t be lef-t free at: each end of the field wher the sald train is in opera-tion.
Now it is the purpose of the invention -to achieve, by subs-tantially simpler means, the ability of known mechanisrn to facilitate -the coupling of a trailer unit to a -tractor or to a preceding trailer unit.
According to the invention, -this purpose is achieved in that the guiding device consists of a guide part rigidly attached to the towbar and spaced laterally therefrom, and of a carrier, the outer end of which is mounted pivotably upon the free end of the said guide part, and which, when the towbar is in the locked position, projects therebeyond to the other side, where it is arranged pivotably upon a frame par-t forming a part of the trailer unit.
This arrangement makes it possible to keep the frame of the coupling mechanism very short, as seen in the direc-tion of travel, or the said frame may consist of a single carrier arranged to pivot in a vertical plane upon the frame of the trailer unit to be coupled. Furthermore, in the case of single-axle trailer units, no separate frame is required for the coup-ling mechanism. Instead, the frame part upon which the carrier of the guiding device is arranged to pivot, may be included in the frame of the unit. The turning radius of the tractor and trailer unit is then determined merely by the lenyth of the tow-bar, since the length of the frame of the known coupling mechanism is thus eliminated.
According to one preferred example of embodiment of the invention, a locking part is -fitted to the towbar and a locking :
3~3~7~
lever is mounted pivotably upon -the frame ~ar-t and has a pro-jection adapted to move over sald loc~incJ part. The said locking lever is connected to a resllient elemen-t ac-tiny in the direction of the said locking part, the range over which the said locking lever pivots being restricted, in the forwardly directed position and against the -tension of said resilient element, by a stop. The front of the said projection has a surface sloping obliquely Eorwards. This is a simple way of providing fully automatic locking of the towbar, so that the driver needs to leave his seat only once, -to carry cut the actual coupllng, i.e. to connect -the -tractor coupling element to the coupling mechanism.
If the coupling element on the towbar, when the latter is in its locked position, is loca-ted upon the centreline run-niny, when the train is moving in a straigh-t line, forwardly between the two bearings on the carrier, then the -towbar is safely guided, after the coupling operation, in its locked position, when the tractor is moved back. This is improved still further by the provision of a stop which limits the extent to which the carrier can pivot to an angle of 60 in relation to its initial locked position. This is to ensure that even a force produced by moving the tractor back, and acting obliquely in an outward direction upon the said carrier, cannot pivot the latter into an outward position in which the towbar would not be locked. If the tractor and a unit already coupled thereto, is moved back in an oblique direction towards a trailer unit to be coupled, then, after the coupling operation, the tractor need be moved only a short distance forwards un-til the carrier of the coupling mechanism bears against the stop. Since in this position, both the towbar coupling element and the guide-ar-t bearing must be located in front of the central area of the coupling mechanlsm, the towbar will be moved safely into its :; :: :
:: : `
~33~
loc~sed posi'ion when -the backward movement takes place.
In order to prevent automatic release of the locking lever from the locking part during travel at high speeds over uneven ground, provision is made, according to ~he invention, ~or the locking lever to be locked additionally, by means of a pin, to the carrier and the towbar, when the latter is in its locked position. In this case, a particularly stable and reliable design is obtained, in that the locking lever is located above both the carrier and the towbar and ~is connected to, and secured against rotation in relation to, a second locking lever of the same kind and in the same position below -the carrier and the tow-bar, with the locking part projecting through the towbar.
If a handle projecting freely in an upward direction is secured to locking lever located above the carrier and the towbar, this provides the additional advantage of easy and con-venient actuation of the locking lever, or levers, during un-coupling of the trailer unit.
In accordance with a specific embodiment of-the invention, a coupling mechanism for agricultural trailer-units comprises: a coupling element movable within aspecific range and mounted at one end of a towbar; said towbar being adapted to be locked in a towing position by means of a spring loaded lockingimeans, said towbar bein~
connected, at the other end thereof, to one end o~ a guide part, the other end of said guide part being pivotably connected to one end of a carrier, the one end of said carrier projecting from said towbar towards said guide part when the mechanism is loc~ed in said towing position, characterized in that the one end of the towbar comprises the forwardly projecting end thereof; and in that the said towbar is secured rigidly to the guide part, and the locking ~ 4 -B
-o~ ~ q~
means is in the form of a pivotably arranged locki.ng lever adapted to be locked by means of a locking part, the said locking lever comprising, for locking purposes, a projec-tion and a surface running obliquely outwards against the action of a resilient element, and the pivoting range of said locking lever being limited, by a lever stop, to a position in which the said surface of the projection comes into contact with the locking part when the coupling element is moved into the locked towiny position.
The invent.ion is expla.ined in greater detail hereinafter in conjunction with the drawing attached hereto, wherein:
FIGURE 1 is a plan view of the coupling mechanism according to the invention in the locked position:
FIGURE 2 is a section along the line A-B through the same coupling mechanism, and FIGURE 3 is a plan view of the same coupling mechanism with the lock released.
The coupling mechanism comprises a towbar 1 equipped at its front end w~th a coupling element 2 and with its rear end connected to a guiding device 3. The latter consists of a forked guide part 4 welded to tow-bar 1 and spaced laterally therefrom, and of a carrier 5, one end of which is arranged to pivo-t in a bearing 6 at the free end of guide part 4. In the locked position shown in Fig. 1, carrier 5 extends to the other side - 4a -~ILV~V~D f ~o beyond towbar 1, -the other encl of the said carrier being also pivotable in a bearing 7 located in a frame part 8, the latter being connected in any known manner, not shown, to the trailer unit to be coupled up. In this case, coupling element 2 is located exactly upon centreline 10 which passes, when the train is running in a straight line, in a forward direction between bearings 6 and 7 of carrier 5.
Furthermore a locking par-t 11 is secured to towbar 1, the said part projecting from the towbar on both sides and being located, when the mechanism is in the retrac-ted posi-tion, close to carrier 5, so that the said towbar cannot be pivoted rear-wardly beyond carrier 5. Mounted ro-tatably in frame paxt 8, behind towbar 1 is a pin 12 which projects on both sides from frame par-t 8, a forwardly projecting locking lever 13 being secured, on each side of the frame, to the projecting ends of said pin. The front end of each of the said locking levers has projection 14 adapted to pivot over the outwardly projecting ends of locking part 11. In order to prevent locking levers 13 : from pivoting inwardly towards bearing 7 of carrier 5, they are connected together, above frame part 8 by a s-top 15. A
resilient element 16 is secured to the each projecting end of the stop, the other ends of these elements being secured to frame part 8 and thus applying to locking levers 13 a force causing them to bear against locking part 11 and stop 15.
In order to achieve, during the locking operation, ~automatic return of locking lever 13 against the force of res-ilient element 6, the front end of each locking lever 13 is provided with a surface 17 which slopes obliquely in a forward direction. Also~secured to upper locking lever 13 is a handle 18 projec-ting freely upwards. For the purpose of securing : towbar 1 additionally in its locked position, holes 19 are located ln the lower~part of the said towba~, halfway along 33~7~
carrier 5, and in lockiny levers 13. When towbar :L is in its locked position, locking pin 20 is inserted into holes 19.
When this lockin~ pin is not in use, it may be inserted into sleeve 21 welded to frame part 8. Finally, a stop 22 is pro-vided in front of bearing 7 in carrier 5. As shown in Fig. 3, this stop restricts the range over which carrier 5 may pivot from its locked position to an angle~ of 60.
The procedure for coupling a trailer unit to a tractor is as follows:
The tractor is first moved towards the coupling mechanism until the trailer coupling thereof is located wi-thin the range of movement 23 of coupling element 2, indicated in do-tted lines in Fig. 3. Since -this covers a relatively large area, it is quite possible for the tractor driver to accomplish this maneuvre, even when the closeness of the -tractor and the trailer unite prevents him from seeing -the coupling member from his seat on the tractor.
Locking pin 20 is then removed from holes 19, upper locking lever 13 is pivoted rearwardly until its projection 1~, and therefore also projection 1~ of the lower locking lever, are released from locking part 11, and towbar 1 is pulled forward un-til coupling element 2 can be coupled to the tr~iler coupling on the tractor. Since the tractor wlll relatively located centrally and straight ahead oE the coupli.ng mechanism, the tractor, with the trailer unit, should always be driven a short distance straight ahead, so that the coupling mechanism may assume the extended configuration shown in Fig. 2. This brinys carrier 5 up against stop 22, while bearing 6 and coupling elemcnt 2 are located exactly upon the centre line.
The tractor is then moved back, causing towbar 1 and guide part ~ to pivot in the direction of arrow 2~, and carrier 5 in the direction arrow 25. Towards the end of these movements, ' ~. .
~LV~3~7~
lockinc~ part 11 lmpinges upon oblique surfaces 17 o:E locklng levers 13 which are therefore forcecl back ~gainst the action of resilient elements 16, until projections 1~ are in -front of the said locking part and are pulled into the locked position, shown in Fig. 1, by resilient elements 16. Lockiny pin 20 may now be reinserted into holes 19 which are now aligned with each other.
Claims (6)
1. A coupling mechanism for agricultural trailer-units, comprising:
a coupling element movable within a specific range and mounted at one end of a towbar;
said towbar being adapted to be locked in a towing position by means of a spring loaded locking means;
said towbar being connected, at the other end thereof, to one end of a guide part, the other end of said guide part being pivotably connected to one end of a carrier;
the one end of said carrier projecting from said towbar towards said guide part when the mechanism is locked in said towing position;
characterized in that the one end of the towbar comprises the forwardly projecting end thereof;
and in that the said towbar is secured rigidly to the guide part, and the locking means is in the form of a pivotably arranged locking lever adapted to be locked by means of a locking part, the said locking lever com-prising, for locking purposes, a projection and a surface running obliquely outwards against the action of a resilient element, and the pivoting range of said locking lever being limited, by a lever stop, to a position in which the said surface of the projection comes into con-tact with the locking part when the coupling element is moved into the locked towing position.
a coupling element movable within a specific range and mounted at one end of a towbar;
said towbar being adapted to be locked in a towing position by means of a spring loaded locking means;
said towbar being connected, at the other end thereof, to one end of a guide part, the other end of said guide part being pivotably connected to one end of a carrier;
the one end of said carrier projecting from said towbar towards said guide part when the mechanism is locked in said towing position;
characterized in that the one end of the towbar comprises the forwardly projecting end thereof;
and in that the said towbar is secured rigidly to the guide part, and the locking means is in the form of a pivotably arranged locking lever adapted to be locked by means of a locking part, the said locking lever com-prising, for locking purposes, a projection and a surface running obliquely outwards against the action of a resilient element, and the pivoting range of said locking lever being limited, by a lever stop, to a position in which the said surface of the projection comes into con-tact with the locking part when the coupling element is moved into the locked towing position.
2. A coupling device according to claim 1, wherein the other end of said carrier is pivotably mounted on a frame, said carrier being mounted, at both ends thereof, by bearings which permit the pivoting at both ends;
characterized in that, in the inset lock towing position, the coupling element is located upon the centre-line running forwardly, in the straight direction of travel, between the said bearings of the carrier.
characterized in that, in the inset lock towing position, the coupling element is located upon the centre-line running forwardly, in the straight direction of travel, between the said bearings of the carrier.
3. A coupling mechanism according to any one of claims 1 or 2, characterized in that a carrier stop is provided for the purpose of restricting the range over which the carrier pivots to an angle .alpha. of 60° in relation to the locked position thereof.
4. A coupling mechanism according to any one of claims 1 or 2, characterized in that a carrier stop is provided for the purpose of restricting the range over which the carrier pivots to an angle .alpha. of 60° in relation to the locked position thereof and further characterized in that, with the towbar in its locked position, the locking lever is adapted to be locked additionally to the carrier and the said towbar, by means of a locking pin.
5. A coupling mechanism according to any one of claims 1 or 2, characterized in that a carrier stop is provided for the purpose of restricting the range over which the carrier pivots to an angle .alpha. of 60° in relation to the locked position thereof and further characterized in that, with the towbar in its locked position, the locking lever is adapted to be locked additionally to the carrier and the said towbar, by means of a locking pin, and still further characterized in that the locking lever is located above the carrier and the towbar and is connected to, and secured against rotation in relation to, a similar second locking lever located in the same position: and in that the locking part passes through the said towbar.
6. A coupling mechanism according to any one of claims 1 or 2, characterized in that a carrier stop is provided for the purpose of restricting the range over which the carrier pivots to an angle .alpha. of 60° in relation to the locked position thereof and further characterized in that, with the towbar in its locked position, the lock-ing lever is adapted to be locked additionally to the carrier and the said towbar, by means of a locking pin, and still further characterized in that the locking lever is located above the carrier and the towbar and is connected to, and secured against rotation in relation to, a similar second locking lever located in the same position, and in that the locking part passes through the said towbar, and still further characterized in that a handle is secured, projecting freely in an upward direction, to the locking lever located above the carrier and the towbar.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772712960 DE2712960C3 (en) | 1977-03-24 | 1977-03-24 | Coupling device for agricultural implements |
| DEP2712960.8-21 | 1977-03-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1093372A true CA1093372A (en) | 1981-01-13 |
Family
ID=6004547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA299,332A Expired CA1093372A (en) | 1977-03-24 | 1978-03-20 | Coupling mechanism for agricultural trailer units |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1093372A (en) |
| DE (1) | DE2712960C3 (en) |
| GB (1) | GB1575164A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2835920C2 (en) * | 1978-08-16 | 1982-09-23 | Steinbock Gmbh, 8052 Moosburg | Coupling device |
| US4440417A (en) * | 1982-03-18 | 1984-04-03 | Kirchner Jerry K | Hitch assembly |
| DE3301984C2 (en) * | 1983-01-21 | 1986-11-13 | H. Niemeyer Söhne GmbH & Co KG, 4446 Hörstel | Additional roller for trailing implements for tillage |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH567947A5 (en) * | 1972-12-19 | 1975-10-15 | Wehr Gmbh | |
| US3904225A (en) * | 1974-07-29 | 1975-09-09 | Jimmie George | Adjustable trailer hitch |
-
1977
- 1977-03-24 DE DE19772712960 patent/DE2712960C3/en not_active Expired
-
1978
- 1978-03-20 CA CA299,332A patent/CA1093372A/en not_active Expired
- 1978-03-23 GB GB1158578A patent/GB1575164A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1575164A (en) | 1980-09-17 |
| DE2712960A1 (en) | 1978-09-28 |
| DE2712960B2 (en) | 1980-12-11 |
| DE2712960C3 (en) | 1981-10-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |