CA1121314A - Agri-winch - Google Patents
Agri-winchInfo
- Publication number
- CA1121314A CA1121314A CA000353348A CA353348A CA1121314A CA 1121314 A CA1121314 A CA 1121314A CA 000353348 A CA000353348 A CA 000353348A CA 353348 A CA353348 A CA 353348A CA 1121314 A CA1121314 A CA 1121314A
- Authority
- CA
- Canada
- Prior art keywords
- vehicle
- plate
- point
- winch
- point hitch
- 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
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
- B66C23/44—Jib-cranes adapted for attachment to standard vehicles, e.g. agricultural tractors
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Agronomy & Crop Science (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Agricultural Machines (AREA)
- Handcart (AREA)
Abstract
ABSTRACT
An apparatus for drawing logs behind a tractor having a hydraulic three point hitch. The apparatus is a substantially vertical plate positioned transversely with respect to the direction of travel of the vehicle and a pair of wheels located at opposite edges of the plate and journalled for rotation on axles rigidly mounted relative to the plate. A
cross-bar is pivotally attached to the plate adjacent a lower edge thereof by a pivot pin having a pivot axis parallel to the direction of travel of the vehicle in mid-width thereof. Two points of the three point hitch are connected to the cross-bar respectively on opposite sides of the pivot point and the third point of the three point hitch is connected to a frame supporting the plate at a point higher than the cross-bar.
A which is mounted on the plate at a side thereof facing the vehicle and driven by power take-off on the vehicle. The frame on which the plate is mounted projects upwardly beyond the upper edge of the plate and terminates in a towing hitch. A
fairlead is secured to the projecting portion and over which a cable passes that is wound onto the winch.
An apparatus for drawing logs behind a tractor having a hydraulic three point hitch. The apparatus is a substantially vertical plate positioned transversely with respect to the direction of travel of the vehicle and a pair of wheels located at opposite edges of the plate and journalled for rotation on axles rigidly mounted relative to the plate. A
cross-bar is pivotally attached to the plate adjacent a lower edge thereof by a pivot pin having a pivot axis parallel to the direction of travel of the vehicle in mid-width thereof. Two points of the three point hitch are connected to the cross-bar respectively on opposite sides of the pivot point and the third point of the three point hitch is connected to a frame supporting the plate at a point higher than the cross-bar.
A which is mounted on the plate at a side thereof facing the vehicle and driven by power take-off on the vehicle. The frame on which the plate is mounted projects upwardly beyond the upper edge of the plate and terminates in a towing hitch. A
fairlead is secured to the projecting portion and over which a cable passes that is wound onto the winch.
Description
2~31~
This invention relates to an apparatus for use in skidding trees and more particularly a tractor mountable wheeled logging winch.
In the prior art there is disclosed numerous different types of apparatus attached in one ~anner or another to a tractor to reduce drag forces in skidding pre-felled trees from the felling site to some distant location where the trees are loaded or processed. Such apparatus permits using ordinary mid-power range farm tractors for logging operations when the tractor is not required for farm use or provides a line of mechanized skidders at a reasonable cost for small operators unable to afford tree skidders designed specifically for such purpose and of, for example, the articulated type used in large industrial logging operations.
Onet~pe ofprior artdevice is an arch and choker consisting of a trailer unit having an upwardly arched frame and towed by a tractor having a winch mounted thereon. The trailer is normally supported by two wheels and the arched frame has pulleys and/or fair leads on an upper portion thereof guiding a cable reeled onto and paid out from the winch mounted on the -tractor. The arch frame straddles the end of a log attached to a choker on the end of the cable. Drag forces during skidding are substantially reduced by raising the leading end of the log while being towed by the vehicle. The arch and cho~er devices, however, in most instances are designed for commercial full time use and thus are heavy and costly pieces of equip-ment. Considerable interest in recent years has developed in having a farm tractor mounted winch enabling farmers and/or ~Z~31~
wood lot owners to supplement their income or secure a source of fire wood at a time when their tractor would otherwise be idle. This will become even more prevalent as wood burning stoves become more widely used due to shortages of oil and/or gas for heating.
The known trailer type logging arches in most all instances connect by a single point hitch to the towing vehicle and because of this there results in a substantial overall length of the combined tractor and trailer. This substantial overall length limits the turning capability and thus is difficult to manoeu~re in restricted ~ield conditions. There is disclosed in UOS~ Patent 3,384,254, issued May 21st, 1968 to H. Helm, a log drawing apparatus connectible to a towing vehicle having a three point hitch. This considerably shortens the overall length and eliminates difficulties encountered when backing up with a normal tractor-trailer apparatus. The present invention is directed to a three point hitch attachment type, but in cases o~ necessit~ can also be used with tow vehicles having a single point hitch. One of the basic advantages in utilizing a three point hitch contact is that weight shifting ~rom the sulky to the tractor and/or vice versa is simply accomplished for maximization of traction forces to drag a load when the need occurs and/or manoeuvre through ditches, over banks, rocl;s, and other obstacles. I~eight shi~ting is known in the trailer type arch for example as disclosed in U.S. Patent 2,~12,279 issued September 30th, 1952 to L.R. Si~mons.
A principal objectof the present invention is to provide a sulky type tree towing apparatus mountable on a ~arm type 213~4 tractor having a hyclraulically operated three point hitch.
In accordance with the present invention there is provided an apparatus for drawin~ logs behind a vehicle and for connection to the vehicle having a hydraulic three point hitch, said apparatus comprising a substantially vertical plate positioned transversely with respect to the direction of travel of said vehicle, a pair of wheels located at opposite edges of the plate and journalled for rotation on axles rigidly mounted relative to said plate, a cross bar pivotally attached to said plate adjacent a lower edge thereof by a pivot pin having a pivot axis parallel to the direction of travel of the vehicle and mid-width thereof, first connection means on said cross bar permitting said cross bar to be mounted on two points of the hydraulic three point hitch of said vehicle, said two points being located respectively on opposite sides of said pivot pin and equally spaced therefrom, second connection means on said plate above said cross bar permitting the third point of said three point hitch to be attached thereto/ a winch mounted on said plate on a side thereof facing said vehicle and driven by a power take off on said vehicle, a frame secured to said plate and projectin~ upwardly above the upper edge thereof and having a fair lead on said projecting portion over which a cable wound ons~id winch passes to the rear for attachment to logs to be skidded.
The invention is illustrated by way of example with reference to the accompanying drawings wherein:
~12~3~4 Figure 1 is an oblique view of the apparatus provided in accordance with the present invention;
Figure 2 is a front elevational view illustrating the apparatus in fur~her detail;
Figure 3 is a rear elevational view of the apparatus il~ustrated in Figure 2; and Figure 4 ~s a side elevational view of Figure 3.
Referring now to the drawings, there is illustrated a sulky type apparatus mountable on a tractor having a three point hitch quickly transforming a farm type tractor into an effective logging machine that resembles a wheeled cable skidder but at substantially reduced cost. The apparatus is referred to a sulky type as it is supported on wheels and connected to the three point hi~ch of the tractor in such a manner as to allow the tractor to roll while the wheels of the sulky remain in contact with the ground for supporting loads carried during skiddiny of tre~s attached to a cable anchored to the frame of the sulky. The apparatus consists of a fra~e 10 having rigidly mounted thereon a pair of stub axles 11 on which there is journalled for rotation respective ones of a pair of ground engaging wheels 12. The rame 10 has a plate 13 secured thereto and which in nor~al use of the device is disposed in a substantially vertical position. The terr.l 'substantially vertical' herein is used in its broadest sense, distinguishing the present type of apparatus from, for example, skid pans that are substantially horizontal and on which the butt end of logs are placed during skidding. The purpose of the plate being substantially vertical is that it forms a butt
This invention relates to an apparatus for use in skidding trees and more particularly a tractor mountable wheeled logging winch.
In the prior art there is disclosed numerous different types of apparatus attached in one ~anner or another to a tractor to reduce drag forces in skidding pre-felled trees from the felling site to some distant location where the trees are loaded or processed. Such apparatus permits using ordinary mid-power range farm tractors for logging operations when the tractor is not required for farm use or provides a line of mechanized skidders at a reasonable cost for small operators unable to afford tree skidders designed specifically for such purpose and of, for example, the articulated type used in large industrial logging operations.
Onet~pe ofprior artdevice is an arch and choker consisting of a trailer unit having an upwardly arched frame and towed by a tractor having a winch mounted thereon. The trailer is normally supported by two wheels and the arched frame has pulleys and/or fair leads on an upper portion thereof guiding a cable reeled onto and paid out from the winch mounted on the -tractor. The arch frame straddles the end of a log attached to a choker on the end of the cable. Drag forces during skidding are substantially reduced by raising the leading end of the log while being towed by the vehicle. The arch and cho~er devices, however, in most instances are designed for commercial full time use and thus are heavy and costly pieces of equip-ment. Considerable interest in recent years has developed in having a farm tractor mounted winch enabling farmers and/or ~Z~31~
wood lot owners to supplement their income or secure a source of fire wood at a time when their tractor would otherwise be idle. This will become even more prevalent as wood burning stoves become more widely used due to shortages of oil and/or gas for heating.
The known trailer type logging arches in most all instances connect by a single point hitch to the towing vehicle and because of this there results in a substantial overall length of the combined tractor and trailer. This substantial overall length limits the turning capability and thus is difficult to manoeu~re in restricted ~ield conditions. There is disclosed in UOS~ Patent 3,384,254, issued May 21st, 1968 to H. Helm, a log drawing apparatus connectible to a towing vehicle having a three point hitch. This considerably shortens the overall length and eliminates difficulties encountered when backing up with a normal tractor-trailer apparatus. The present invention is directed to a three point hitch attachment type, but in cases o~ necessit~ can also be used with tow vehicles having a single point hitch. One of the basic advantages in utilizing a three point hitch contact is that weight shifting ~rom the sulky to the tractor and/or vice versa is simply accomplished for maximization of traction forces to drag a load when the need occurs and/or manoeuvre through ditches, over banks, rocl;s, and other obstacles. I~eight shi~ting is known in the trailer type arch for example as disclosed in U.S. Patent 2,~12,279 issued September 30th, 1952 to L.R. Si~mons.
A principal objectof the present invention is to provide a sulky type tree towing apparatus mountable on a ~arm type 213~4 tractor having a hyclraulically operated three point hitch.
In accordance with the present invention there is provided an apparatus for drawin~ logs behind a vehicle and for connection to the vehicle having a hydraulic three point hitch, said apparatus comprising a substantially vertical plate positioned transversely with respect to the direction of travel of said vehicle, a pair of wheels located at opposite edges of the plate and journalled for rotation on axles rigidly mounted relative to said plate, a cross bar pivotally attached to said plate adjacent a lower edge thereof by a pivot pin having a pivot axis parallel to the direction of travel of the vehicle and mid-width thereof, first connection means on said cross bar permitting said cross bar to be mounted on two points of the hydraulic three point hitch of said vehicle, said two points being located respectively on opposite sides of said pivot pin and equally spaced therefrom, second connection means on said plate above said cross bar permitting the third point of said three point hitch to be attached thereto/ a winch mounted on said plate on a side thereof facing said vehicle and driven by a power take off on said vehicle, a frame secured to said plate and projectin~ upwardly above the upper edge thereof and having a fair lead on said projecting portion over which a cable wound ons~id winch passes to the rear for attachment to logs to be skidded.
The invention is illustrated by way of example with reference to the accompanying drawings wherein:
~12~3~4 Figure 1 is an oblique view of the apparatus provided in accordance with the present invention;
Figure 2 is a front elevational view illustrating the apparatus in fur~her detail;
Figure 3 is a rear elevational view of the apparatus il~ustrated in Figure 2; and Figure 4 ~s a side elevational view of Figure 3.
Referring now to the drawings, there is illustrated a sulky type apparatus mountable on a tractor having a three point hitch quickly transforming a farm type tractor into an effective logging machine that resembles a wheeled cable skidder but at substantially reduced cost. The apparatus is referred to a sulky type as it is supported on wheels and connected to the three point hi~ch of the tractor in such a manner as to allow the tractor to roll while the wheels of the sulky remain in contact with the ground for supporting loads carried during skiddiny of tre~s attached to a cable anchored to the frame of the sulky. The apparatus consists of a fra~e 10 having rigidly mounted thereon a pair of stub axles 11 on which there is journalled for rotation respective ones of a pair of ground engaging wheels 12. The rame 10 has a plate 13 secured thereto and which in nor~al use of the device is disposed in a substantially vertical position. The terr.l 'substantially vertical' herein is used in its broadest sense, distinguishing the present type of apparatus from, for example, skid pans that are substantially horizontal and on which the butt end of logs are placed during skidding. The purpose of the plate being substantially vertical is that it forms a butt
3~
plate for ends of the logs being skidded, protecting the operator duriny use of the apparatus. The frame 10 has a lower, horizontal ~rame member 14 to which there is pivotally attached a cross bar 15 by a pivot pin 16. The frame 10 has a further cross member 17 at a higher elevation than the cross bar 15 and projecting forwardly from the main portion of the frame. A hydraulically operated three point hitch of a tractor 1~ is represented by a pair of spaced apart lower bars designated 19 and 20 respectively, and an upper bar 21.
The lower bars 19 and 20 are connected at their free outer ends thereof by respective pivot pins 22 and 23 to the cross bar 15 passing through aligned holes in respective ones of a pair of bracket memhers 2~ secured to the cross bar. The pivot pin 16 is preferably located mid-distance between the wlleels and at an elevation at least as high as the pivot axis of the wheels providing clearance ~or use in rough terrain.
The pair of brackets are preferably located e~ually spaced from the pivot pin 16 and on opposite sides thereof. The upper bar 21 of the three point hitch is connected to the frame member 17 by way of a pin 25 passing through aligned apertures in a bracket mer,lber 26. The three point hltch arms 19, 2~
and ,1 have a certain amount of free play on pivot pins 22, 23 and 25 permitting the arms to swing a limited amount in a horizontal plane thus allowing the trailer to trail behind the vehicle when turniny rather than s~id sideways. Similar play occurs in the attachment o~ the arms to the tractor. Tight fits, of course, are possible but this means when turnin~ a corner the trailer unit will skid sideways to accommodate ~2iL3~
changes in direction of the tractor when moving forwardly.
A winch drum-28 is mounted on a shait 29 journalled for rotation ~y respective bearings 30 and 31 on the frame 10.
toothed wheel 32 is secured to the shaft 29 for ro-tation therewith and cooperates with a movable pawl 33 for locking the drum preventing rotation while skidding a load. The pawl 33 is a lever arm member pivotally attached as at 34 to the plate 13 and is normally in a disengaged upper position.
The pawl is remotely controlled by a rope or fl~xible cable 35 which when pulled by the vehicle operator releases the pawl allowing the sa~le to drop by gravity into engagement with the toothed wheel.
A flexible cable, for example l/2" wire rope, 36 is wound onto the drum and passes over a fair lead or pulley 37 journalled on the frame adjacent the upper end thereof by respective ones of a pair of bearings 3~ and 39. The cable has one or more nooses or chokers 40 (many dif~erent arrangements of which are known in the art) for grasping one or more trees 42 to skid the same during forward movement of the vehicle and/or reeling in the cable on the winch drum.
The winch drum shaft 29 has a sprocket 45 secured thereto for rotation therewith as, for example, by a pin 46 passing through a flanged hub on the sprocket and an aperture in the shaft. The pin 46 may be of appropriate material and/or size to determine ma~imum pull permitted on the cable; i.e. shear pin protection avoiding damaging the cable by over-stressing the same. The sprocket 45 is driven by a power take-off from the tractor through a power take-off shaft 47 having a universal l~Z3L3~L4 joint therein designated 4~, a worm gear reduction unit 43 and a chain 50. The chain 50 is a roller chain which loops around and meshes with the sprocket 45 and a further sprocket 51 journalled for rotation on the output shaft 52 of the worm gear reduction unit 4~. The sprocket 51 has an outer face with peripherally spaced apart projections 52 disposed in face to face relation with similarly arranged projections 53 on a flange 54 secured to the shaft for rotation therewith and longitudinally slidable along the shaft by a manually reciprocal unit 55. Effectively the toothed faced flange and tooth face of the sprocket provide a manually operable pull-in pull-out type clutch in the drive train for driving the winch drum as required to reel in the cable for skidding the logs.
In operation the operator drives the tractor with the trailer winch mechanism attached thereto empty to a landing where prefelled trees are to be collected and when arriving at that site, stops, dismounts from the tractor and disengages the ~anual clutch. Thereafter the cahle can be manually pulled from the free wheeling winch drum and upon reaching one or ~ore prefelled trees the choker or chokers are fastened to the trees. Returning to the tractor the operator engages the clutch and mounts the tractor, winching in the trees by engaging the power take-off. The winching in can be effected while the vehicle is stationary or moving forwardly to another site for collecting further trees. The trees when they are winched in are locked by dropping the pawl onto the toothed wheel. The sequence of choking, winching and manoeuvering is repeated until a full load is obtained.
., ~ 7 --~, . . .
:
. .
~.~Z~3~4 Applicant~s log towing device has been constructed an~
used and is known in the market under applicant's trade mark ~GRI-~IINCH and during use has proven efficient. Due to the axle on the apparatus there is better load distribution for skidding and because of utilizing a three-point hitch no weights are required on the front end of the tractor permitting hauling of larger loads without undue strain on three point hitch linkages. The three point hitch arrangement permits manoeuvering on steep slopes because of tlle hydraulicallv controlled extra trailer unit readily adjustable by the operator to shift weight as required for stability and/or traction of the tractor. The unit is simply constructed and rugged.
Because of utilizing a manually operable clutah, no adjustment is needed in corl~parison to conventional winches previously used in sil~lilar circumstances. The turning ability ls excellent because of the looseness in the connections of the pivot pins in thethree poin-t hitchj allowing the use of a three point hitch wnile at the same time providing turning characteristics comparable to a sinyle point hitch.
The log towing device previously described i5 also provided Wit.l a towing hitch 60 secured to the upper free end of the frame 10. The hitch 60 allows using the device as a trailer for occasional use in which case the plate 13 can be used as a load carrying surface. In such position the bars 17 protect the winch and drive mechanism, preventing the same from striking obstacles on the ground. The winch mechanism may also be used when the trailer is in a horizontal position by appropriately re-positioning the worm gear reduction unit 43 3~4~
for connec-ting to the power take-off shaft of the towing vehicle.
_ g _ .
plate for ends of the logs being skidded, protecting the operator duriny use of the apparatus. The frame 10 has a lower, horizontal ~rame member 14 to which there is pivotally attached a cross bar 15 by a pivot pin 16. The frame 10 has a further cross member 17 at a higher elevation than the cross bar 15 and projecting forwardly from the main portion of the frame. A hydraulically operated three point hitch of a tractor 1~ is represented by a pair of spaced apart lower bars designated 19 and 20 respectively, and an upper bar 21.
The lower bars 19 and 20 are connected at their free outer ends thereof by respective pivot pins 22 and 23 to the cross bar 15 passing through aligned holes in respective ones of a pair of bracket memhers 2~ secured to the cross bar. The pivot pin 16 is preferably located mid-distance between the wlleels and at an elevation at least as high as the pivot axis of the wheels providing clearance ~or use in rough terrain.
The pair of brackets are preferably located e~ually spaced from the pivot pin 16 and on opposite sides thereof. The upper bar 21 of the three point hitch is connected to the frame member 17 by way of a pin 25 passing through aligned apertures in a bracket mer,lber 26. The three point hltch arms 19, 2~
and ,1 have a certain amount of free play on pivot pins 22, 23 and 25 permitting the arms to swing a limited amount in a horizontal plane thus allowing the trailer to trail behind the vehicle when turniny rather than s~id sideways. Similar play occurs in the attachment o~ the arms to the tractor. Tight fits, of course, are possible but this means when turnin~ a corner the trailer unit will skid sideways to accommodate ~2iL3~
changes in direction of the tractor when moving forwardly.
A winch drum-28 is mounted on a shait 29 journalled for rotation ~y respective bearings 30 and 31 on the frame 10.
toothed wheel 32 is secured to the shaft 29 for ro-tation therewith and cooperates with a movable pawl 33 for locking the drum preventing rotation while skidding a load. The pawl 33 is a lever arm member pivotally attached as at 34 to the plate 13 and is normally in a disengaged upper position.
The pawl is remotely controlled by a rope or fl~xible cable 35 which when pulled by the vehicle operator releases the pawl allowing the sa~le to drop by gravity into engagement with the toothed wheel.
A flexible cable, for example l/2" wire rope, 36 is wound onto the drum and passes over a fair lead or pulley 37 journalled on the frame adjacent the upper end thereof by respective ones of a pair of bearings 3~ and 39. The cable has one or more nooses or chokers 40 (many dif~erent arrangements of which are known in the art) for grasping one or more trees 42 to skid the same during forward movement of the vehicle and/or reeling in the cable on the winch drum.
The winch drum shaft 29 has a sprocket 45 secured thereto for rotation therewith as, for example, by a pin 46 passing through a flanged hub on the sprocket and an aperture in the shaft. The pin 46 may be of appropriate material and/or size to determine ma~imum pull permitted on the cable; i.e. shear pin protection avoiding damaging the cable by over-stressing the same. The sprocket 45 is driven by a power take-off from the tractor through a power take-off shaft 47 having a universal l~Z3L3~L4 joint therein designated 4~, a worm gear reduction unit 43 and a chain 50. The chain 50 is a roller chain which loops around and meshes with the sprocket 45 and a further sprocket 51 journalled for rotation on the output shaft 52 of the worm gear reduction unit 4~. The sprocket 51 has an outer face with peripherally spaced apart projections 52 disposed in face to face relation with similarly arranged projections 53 on a flange 54 secured to the shaft for rotation therewith and longitudinally slidable along the shaft by a manually reciprocal unit 55. Effectively the toothed faced flange and tooth face of the sprocket provide a manually operable pull-in pull-out type clutch in the drive train for driving the winch drum as required to reel in the cable for skidding the logs.
In operation the operator drives the tractor with the trailer winch mechanism attached thereto empty to a landing where prefelled trees are to be collected and when arriving at that site, stops, dismounts from the tractor and disengages the ~anual clutch. Thereafter the cahle can be manually pulled from the free wheeling winch drum and upon reaching one or ~ore prefelled trees the choker or chokers are fastened to the trees. Returning to the tractor the operator engages the clutch and mounts the tractor, winching in the trees by engaging the power take-off. The winching in can be effected while the vehicle is stationary or moving forwardly to another site for collecting further trees. The trees when they are winched in are locked by dropping the pawl onto the toothed wheel. The sequence of choking, winching and manoeuvering is repeated until a full load is obtained.
., ~ 7 --~, . . .
:
. .
~.~Z~3~4 Applicant~s log towing device has been constructed an~
used and is known in the market under applicant's trade mark ~GRI-~IINCH and during use has proven efficient. Due to the axle on the apparatus there is better load distribution for skidding and because of utilizing a three-point hitch no weights are required on the front end of the tractor permitting hauling of larger loads without undue strain on three point hitch linkages. The three point hitch arrangement permits manoeuvering on steep slopes because of tlle hydraulicallv controlled extra trailer unit readily adjustable by the operator to shift weight as required for stability and/or traction of the tractor. The unit is simply constructed and rugged.
Because of utilizing a manually operable clutah, no adjustment is needed in corl~parison to conventional winches previously used in sil~lilar circumstances. The turning ability ls excellent because of the looseness in the connections of the pivot pins in thethree poin-t hitchj allowing the use of a three point hitch wnile at the same time providing turning characteristics comparable to a sinyle point hitch.
The log towing device previously described i5 also provided Wit.l a towing hitch 60 secured to the upper free end of the frame 10. The hitch 60 allows using the device as a trailer for occasional use in which case the plate 13 can be used as a load carrying surface. In such position the bars 17 protect the winch and drive mechanism, preventing the same from striking obstacles on the ground. The winch mechanism may also be used when the trailer is in a horizontal position by appropriately re-positioning the worm gear reduction unit 43 3~4~
for connec-ting to the power take-off shaft of the towing vehicle.
_ g _ .
Claims (5)
1. An apparatus for drawing logs behind a vehicle and for connection to the vehicle having a hydraulic three point hitch, said apparatus comprising a substantially vertical plate positioned transversely with respect to the direction of travel of said vehicle, a pair of wheels located at opposite edges of the plate and journalled for rotation on axles rigidly mounted relative to said plate, a cross bar pivotally attached to said plate adjacent a lower edge thereof by a pivot pin having a pivot axis parallel to the direction of travel of the vehicle and mid-width thereof, first connection means on said cross bar permitting said cross bar to be mounted on two points of the hydraulic three point hitch of said vehicle, said two points being located respectively on opposite sides of said pivot pin and equally spaced therefrom, second connection means on said plate above said cross bar permitting the third point of said three point hitch to be attached thereto, a winch mounted on said plate on a side thereof facing said vehicle and driven by a power take off on said vehicle, a frame secured to said plate and projecting upwardly above the upper edge thereof and having a fair lead on said projecting portion over which a cable wound on said winch passes to the rear for attachment to logs to be skidded.
2. An apparatus as defined in claim 1 including a towing hitch attached to said upwardly projecting frame portion beyond the fairlead.
3. An apparatus as defined in claim 1 including a clutch in the winch drive train.
4. An apparatus as defined in claim 3 including a ratchet and pawl means associated with the winch selectively to prevent rotation of the same when skidding logs are attached to the cable.
5. An apparatus for drawing logs behind a vehicle and for connection to the vehicle having a hydraulic three point hitch, said apparatus comprising a substantially vertical plate positioned transversely with respect to the direction of travel of said vehicle, a pair of wheels located at opposite edges of the plate and journalled for rotation on axles, first connection means adjacent the lower edge of said plate for connecting two points of the hydraulic three point hitch of said vehicle to said apparatus at horizontally spaced apart positions, second connection means on said apparatus permitting the third point of said three point hitch to be attached to said apparatus at a higher elevation than said first connection means, a winch mounted on said apparatus on a side thereof facing said vehicle and driven by a power take off on said vehicle, a frame secured to said apparatus and projecting upwardly above the upper edge of said plate and having a fair lead on said projecting portion over which a cable wound on said winch passes to the rear for attachment to logs to be skidded and pivot means on said apparatus allowing said wheels to oscillate relative to the vehicle about an axis parallel to the direction of travel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000353348A CA1121314A (en) | 1980-06-04 | 1980-06-04 | Agri-winch |
| SE8102737A SE8102737L (en) | 1980-06-04 | 1981-04-29 | TIMMERSLEPA |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000353348A CA1121314A (en) | 1980-06-04 | 1980-06-04 | Agri-winch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1121314A true CA1121314A (en) | 1982-04-06 |
Family
ID=4117105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000353348A Expired CA1121314A (en) | 1980-06-04 | 1980-06-04 | Agri-winch |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA1121314A (en) |
| SE (1) | SE8102737L (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0532821A1 (en) * | 1991-09-19 | 1993-03-24 | Franz Xaver Dechant | Trailer for transporting timber |
| US6231030B1 (en) * | 2000-05-12 | 2001-05-15 | Robert C. Smith | Minimal topsoil disturbance log skidder |
| US20190232850A1 (en) * | 2018-01-31 | 2019-08-01 | Riccardo Mistichelli | Vehicle log hitch |
-
1980
- 1980-06-04 CA CA000353348A patent/CA1121314A/en not_active Expired
-
1981
- 1981-04-29 SE SE8102737A patent/SE8102737L/en not_active Application Discontinuation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0532821A1 (en) * | 1991-09-19 | 1993-03-24 | Franz Xaver Dechant | Trailer for transporting timber |
| US6231030B1 (en) * | 2000-05-12 | 2001-05-15 | Robert C. Smith | Minimal topsoil disturbance log skidder |
| US20190232850A1 (en) * | 2018-01-31 | 2019-08-01 | Riccardo Mistichelli | Vehicle log hitch |
| US10933792B2 (en) * | 2018-01-31 | 2021-03-02 | Riccardo Mistichelli | Vehicle log hitch |
Also Published As
| Publication number | Publication date |
|---|---|
| SE8102737L (en) | 1981-12-05 |
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