WO2013180664A1 - Forestry winch with controlled decoiling of a towing cable - Google Patents

Forestry winch with controlled decoiling of a towing cable Download PDF

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Publication number
WO2013180664A1
WO2013180664A1 PCT/SI2013/000029 SI2013000029W WO2013180664A1 WO 2013180664 A1 WO2013180664 A1 WO 2013180664A1 SI 2013000029 W SI2013000029 W SI 2013000029W WO 2013180664 A1 WO2013180664 A1 WO 2013180664A1
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WO
WIPO (PCT)
Prior art keywords
pulley block
towing cable
roller member
sensor
upper pulley
Prior art date
Application number
PCT/SI2013/000029
Other languages
French (fr)
Inventor
Iztok Span
Original Assignee
Tajfun Planina Proizvodnja Strojev, D.O.O.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tajfun Planina Proizvodnja Strojev, D.O.O. filed Critical Tajfun Planina Proizvodnja Strojev, D.O.O.
Priority to EP13748379.8A priority Critical patent/EP2855335B1/en
Publication of WO2013180664A1 publication Critical patent/WO2013180664A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/36—Guiding, or otherwise ensuring winding in an orderly manner, of ropes, cables, or chains
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/28—Other constructional details
    • B66D1/40—Control devices
    • B66D1/48—Control devices automatic
    • B66D1/50—Control devices automatic for maintaining predetermined rope, cable, or chain tension, e.g. in ropes or cables for towing craft, in chains for anchors; Warping or mooring winch-cable tension control
    • B66D1/505—Control devices automatic for maintaining predetermined rope, cable, or chain tension, e.g. in ropes or cables for towing craft, in chains for anchors; Warping or mooring winch-cable tension control electrical

Definitions

  • the invention refers to hoisting, lifting or hauling appliances, in particular to winches, namely to construction details thereof.
  • the invention is to create a forestry winch, which should be suitable for coupling to an usual tractor, and by which a towing cable could be decoiled from a winding drum by means of a motor-driven pulley block, but at the same time each uncontrolled decoiling of the cable and forming of insufficiently tensioned sections of said cable, which might lead to formation of loops and consequently to damages or destroying of said cable, would have to be prevented in a reliable manner.
  • a forestry winch as such is described e.g. in SI 9600339 A2.
  • Such winch comprises a casing, which is on the one hand furnished with beams for establishing a required connection with a three-point mechanism of an usual tractor, as well as with an end portion of a shaft suitable for connection with a joint shaft of a tractor.
  • the opposite side of said housing is furnished with a deflecting surface, a so-called board, which essentially forms a part of casing of a driving and towing unit in such winch, which moreover comprises a winding drum with a brake and a clutch, as well as a reduction gearbox, via which said shaft is connected to said end portion of the shaft for connection with said joint shaft of each tractor.
  • a towing cable is wound around said drum, which is optionally directed over an upper pulley block or over a lower pulley block towards each load, which shall be towed.
  • An upper pulley block is mounted on said winch frame above an lower pulley block and is furnished with a motor-driven pulley.
  • Such upper pulley block is described e.g. in SI 22800 A and is furnished with a pulley, which is driven by means of a hydraulic motor and is moreover adapted for guiding of a towing cable and in particular also for decoiling of said towing cable from each belonging winding drum.
  • the section of the towing cable in the area between the upper pulley block and the lower pulley block shall be permanently tensioned at least in such extent that the cable could maintain at least approximately linear shape, which is normally expected when an user together with the free end portion of said towing cable is moving towards the load.
  • the present invention refers to a forestry winch with controlled decoiling of a towing cable, wherein such winch comprises a frame, on which a winding drum together with a towing cable wound thereon is rotationally embedded and adapted to be driven by means of a cardan joint of a tractor and controlled by means of a clutch and a brake, said winch further comprising an upper pulley block with an integrated motor driven upper pulley and an lower pulley block with an integrated freely rotatable pulley, so that said towing cable extends from said winding drum via the upper pulley block and the lower pulley block towards each disposable load.
  • an additional roller member is arranged in the area between the upper pulley block and the lower pulley block, and is adapted to be rolled along the surface of each disposable towing cable.
  • Said roller member when resting on said surface of the towing cable, is pivotally i.e. with the possibility of swiveling between its first and second position mounted on said upper pulley block, and is
  • Said winch is furthermore characterized by a sensor which is adapted for detecting each position of said additional roller member, namely at least for detecting, whether said roller member is located in its first or second position.
  • said pulley of the upper pulley block is driven by means of a motor, which is at least by operating in a direction of decoiling of the towing cable from the winding drum controlled on the basis of signals received from the sensor for detecting of each position of the roller member and herewith also of the tension of the towing cable in the area between the upper pulley block and the lower pulley block.
  • Said motor for driving of a pulley of the upper pulley block is preferably a hydraulic motor.
  • Said additional roller member is preferably a roller, which is freely rotatable around its axis, wherein said axis is embedded on at least one lever, which is pivotally mounted and elastically supported on the casing of the upper pulley block, by means of which said roller member is pressed in a direction away from the frame and towards the towing cable, wherein said at least one lever is adapted to cooperate with said sensor for detecting of position of the roller member.
  • Said sensor for detecting of position of the roller member can be an inductive sensor.
  • Said sensor for detecting of position of the roller member is attached on the casing of the upper pulley block adjacent to the lever, which bears the roller member.
  • At least one lever for bearing of said roller member is furnished with a protrusion, which is adapted to cooperate with said sensor, wherein said protrusion is formed to establish a contact with the sensor, when the roller member is located in its first position and the towing cable is tensioned, and is in any other position of the roller member, when the towing cable is not tensioned, located apart from said sensor.
  • At least one lever for bearing said roller member is furnished with a protrusion , which is adapted to cooperate with said sensor, wherein said protrusion is displaced apart from said sensor, when the roller member is located in its first position and the towing cable is tensioned, but in any other position of said roller member, when the towing cable is not tensioned, said protrusion is brought in contact with the sensor.
  • Fig. 1 is a perspective view of a motor-driven upper pulley block of a forestry winch with controlled decoiling of a towing cable
  • Fig. 2 is a side view of a partially shown forestry winch during decoiling of the towing cable, wherein the section of said towing cable in the area between the upper pulley block and the lower pulley block is tensioned;
  • Fig. 3 is also a side view of a partially shown forestry winch during decoiling of the towing cable, wherein the section of said towing cable in the area between the upper pulley block and the lower pulley block is insufficiently tensioned i.e. not tensioned.
  • FIG. 1 A forestry winch with controlled decoiling of a towing cable is presented in Fig. 1, wherein such winch comprises a frame 1 , in which a winding drum is rotationally embedded, around which a towing cable 2 is wound and which is driven by means of a cardan joint shaft of a tractor and controlled by means of a clutch and a brake.
  • the drum as such drum is known to persons skilled in the art, and is therefore not separately shown in the attached drawing.
  • a clutch and optionally also a transmission gear is foreseen between the shaft of said drum and said cardan joint.
  • Said upper pulley block 3 is adapted for decoiling of the towing cable 2 when the brake is deactivated and the clutch is activated, by which the winding drum together with the towing cable 2 wound thereon becomes freely rotatable, upon which the user is allowed to extend the free end of said towing cable 2 towards the load and to couple it with the load.
  • the pulley 30 of the upper pulley block 3 is driven by means of a motor 32, which is at least in a direction of decoiling of the towing cable 2 from the winding drum controlled on the basis of signals obtained from said sensor 6 for detecting of position of the roller member 5 as well as of each tension of the towing cable 2 in the area between the upper pulley block 3 and the lower pulley block 4.
  • Said motor 32 for driving said pulley 30 of the upper pulley block 3 is preferably a hydraulic motor.
  • said additional roller member 5 is a roller, which is freely rotatable around its axis 50, wherein said axis 50 is mounted on a lever 51 , which is pivotally and in an elastically supported manner attached to a casing 31 of the upper pulley block 3 and by means of which the roller member 5 is pressed in a direction apart from the frame 1 and towards the towing cable 2, and wherein said lever 51 is adapted to cooperate with said sensor 6 for indicating each position of the roller member 5.
  • a spring, by which said lever 51 is supported, is not separately shown in the drawings, but generally it is a tension or compression helical spring, or deflecting spring or any other suitable sufficiently resilient part.
  • At least one lever 51 for bearing said roller member 5 is furnished with a protrusion 510, which is adapted to cooperate with said sensor 6.
  • the protrusion 510 is formed to establish a contact with the sensor 6, when the roller member 5 is located in its first position and the towing cable 2 is tensioned, and is in any other position of the roller member 5, when the towing cable 2 is not tensioned, located apart from said sensor 6.
  • said at least one lever 51 for bearing said roller member 5 is furnished with a protrusion 510, which is adapted to cooperate with said sensor 6, wherein said protrusion 510 is displaced apart from said sensor 6, when the roller member 5 is located in its first position and the towing cable 2 is tensioned, but in any other position of said roller member 5, when the towing cable 2 is not tensioned, said protrusion 510 is brought in contact with the sensor 6.
  • said motor 32 for driving the pulley 30 of the upper pulley block 3 can be controlled in such manner that it can be activated when the clutch on the shaft of the winding drum is deactivated and the drum is upon deactivation of the brake freely rotatable, by which the pulley 30 of the upper pulley block 3 is driven for the purposes to decoiling of the towing cable 2 from the winding drum until the sensor 6 for detecting of position of said additional roller member detects that the towing cable 2 in the area between the upper pulley block 3 and the lower pulley block 4 is no more tensioned.
  • energizing of the motor 32 of the upper pulley block 3 is automatically terminated.
  • any uncontrolled decoiling of the towing cable 2 from the winding drum is prevented in a reliable manner, by which formation of insufficiently tensioned sections of the towing cable is eliminated, and loops leading to damages or destroying of the towing cable 2 cannot be formed anymore.

Abstract

The invention refers to a forestry winch with controlled decoiling of a towing cable (2) extending from a winding drum via the upper pulley block (3) and via the lower pulley block (4) towards each towed load. An additional rolling member (5) is foreseen between said upper pulley block (3) and said lower pulley block (4) and is with the possibility of swiveling between its first end position and second end position embedded on said upper pulley block (3). Said winch is moreover furnished with a sensor (6), which is capable to identify, whether said rolling member (5) is located in its first or in its second position, which depends on the state of the towing cable (2), namely on the tension thereof in the area between the upper pulley block (3) and the lower pulley block (4). Consequently, the motor (32) for driving the pulley (30) of the upper pulley block (3) can be controlled on the basis of signal received from said sensor (6).˙

Description

Forestry winch with controlled decoiling of a towing cable
In the field of transporting, the invention refers to hoisting, lifting or hauling appliances, in particular to winches, namely to construction details thereof.
The invention is to create a forestry winch, which should be suitable for coupling to an usual tractor, and by which a towing cable could be decoiled from a winding drum by means of a motor-driven pulley block, but at the same time each uncontrolled decoiling of the cable and forming of insufficiently tensioned sections of said cable, which might lead to formation of loops and consequently to damages or destroying of said cable, would have to be prevented in a reliable manner.
A forestry winch as such is described e.g. in SI 9600339 A2. Such winch comprises a casing, which is on the one hand furnished with beams for establishing a required connection with a three-point mechanism of an usual tractor, as well as with an end portion of a shaft suitable for connection with a joint shaft of a tractor. The opposite side of said housing is furnished with a deflecting surface, a so-called board, which essentially forms a part of casing of a driving and towing unit in such winch, which moreover comprises a winding drum with a brake and a clutch, as well as a reduction gearbox, via which said shaft is connected to said end portion of the shaft for connection with said joint shaft of each tractor. A towing cable is wound around said drum, which is optionally directed over an upper pulley block or over a lower pulley block towards each load, which shall be towed. An upper pulley block is mounted on said winch frame above an lower pulley block and is furnished with a motor-driven pulley. Such upper pulley block is described e.g. in SI 22800 A and is furnished with a pulley, which is driven by means of a hydraulic motor and is moreover adapted for guiding of a towing cable and in particular also for decoiling of said towing cable from each belonging winding drum.
Such forestry winch is generally suitable for coupling to a tractor and is furnished with a winding drum, on which a towing cable is wound. As soon as each load, e.g. a timber or several timbers coupled to each other, rotation of said winding drum in appropriate direction results in winding of the towing cable onto said drum and consequently to towing of said load towards the winch. Prior to said towing, the drum needs to be directed in the opposite direction, by which the cable is decoiled from the drum and extended towards the load in order to attach the load to the cable. In particular in some larger winches the towing cable is relatively thick, and the force required for decoiling of the cable is quite high due to friction and inertia of the drum together with the towing cable wound thereon. Of that reason, a motor-driven upper pulley block is extremely useful for each user.
Despite to essential easier decoiling of the towing cable from the winding drum by means of said motor-driven upper pulley block, such approach can also result in certain deficiencies. By activating said motor-driven upper pulley block, which can in modern winches be achieved by means of a remote controller, the pulley starts tensioning the cable and decoiling said cable from the winding drum with a predetermined velocity. A section of decoiled towing cable in the area between the winding drum and the upper pulley block is permanently tensioned and remains tensioned even in situation, where each user has stopped operation of the pulley block, since in such situation also rotation of the winding drum is simultaneously and automatically terminated by means of a brake. Also the section of the towing cable in the area between the upper pulley block and the lower pulley block shall be permanently tensioned at least in such extent that the cable could maintain at least approximately linear shape, which is normally expected when an user together with the free end portion of said towing cable is moving towards the load. In the practice, it may happen from time to time that the user is unable to move towards the load with the velocity equal to velocity of decoiling of the cable, and the towing cable in the area between the upper pulley block and the lower pulley block, or each user respectively, is no more tensioned. This may actually happen in various situations and of various reasons, in particular when the user suddenly stops walking or his progress by walking is hindered due to obstacles in situ, by which the user is sometimes also unable to terminate promptly operation of the pulley block and decoiling of the towing cable from the winding drum. Those skilled in the art shall no doubt understand that the probability of such situations by performing forestry operations in the forest is pretty high due to irregularities of terrain and natural obstacles. The towing cable, when insufficiently tensioned, shows a tendency of rotation around its longitudinal axis, bending and formation of loops, and moreover, also extending thereof into a linear shape is not easy due to its thickness and elasticity. When such towing cable starts coiling onto a winding drum, it is tensioned by means of the torque on the winding drum and due to resistance of the load against displacing thereof, by which each formed loop on the towing cable usually cannot be transformed back to linear shape and is therefore bent or even knicked, which due to essential loadings leads to damages or even to destroying of the towing cable, upon which both further use of the winch and security of each user and other persons in the vicinity are questionable.
The present invention refers to a forestry winch with controlled decoiling of a towing cable, wherein such winch comprises a frame, on which a winding drum together with a towing cable wound thereon is rotationally embedded and adapted to be driven by means of a cardan joint of a tractor and controlled by means of a clutch and a brake, said winch further comprising an upper pulley block with an integrated motor driven upper pulley and an lower pulley block with an integrated freely rotatable pulley, so that said towing cable extends from said winding drum via the upper pulley block and the lower pulley block towards each disposable load.
In accordance with the invention, an additional roller member is arranged in the area between the upper pulley block and the lower pulley block, and is adapted to be rolled along the surface of each disposable towing cable. Said roller member, when resting on said surface of the towing cable, is pivotally i.e. with the possibility of swiveling between its first and second position mounted on said upper pulley block, and is
- either thanks to its elastic supporting thereof, in particular by means of a spring, forced to remain in its first position, in which a tangent to its circumferential surface is aligned with a tangent to the pulley of the upper pulley block and also with a tangent to the pulley of the lower pulley block and therewith also with a direction of the towing cable when extending via the pulley of the upper pulley block and the pulley of the lower pulley block;
- or is, thanks to elastic supporting thereof, swiveled from said first position, in which a tangent to its circumferential surface is aligned with a tangent to the pulley of the upper pulley block and with a tangent to the pulley of the lower pulley block and therewith with a direction of the towing cable when extending via the pulley of the upper pulley block and the pulley of the lower pulley block, to its second position, which indicates that the towing cable between the upper pulley block and the lower pulley block is not tensioned
Said winch is furthermore characterized by a sensor which is adapted for detecting each position of said additional roller member, namely at least for detecting, whether said roller member is located in its first or second position.
In accordance with a preferred embodiment of the invention, said pulley of the upper pulley block is driven by means of a motor, which is at least by operating in a direction of decoiling of the towing cable from the winding drum controlled on the basis of signals received from the sensor for detecting of each position of the roller member and herewith also of the tension of the towing cable in the area between the upper pulley block and the lower pulley block. Said motor for driving of a pulley of the upper pulley block is preferably a hydraulic motor.
Said additional roller member is preferably a roller, which is freely rotatable around its axis, wherein said axis is embedded on at least one lever, which is pivotally mounted and elastically supported on the casing of the upper pulley block, by means of which said roller member is pressed in a direction away from the frame and towards the towing cable, wherein said at least one lever is adapted to cooperate with said sensor for detecting of position of the roller member.
Said sensor for detecting of position of the roller member can be an inductive sensor.
Said sensor for detecting of position of the roller member is attached on the casing of the upper pulley block adjacent to the lever, which bears the roller member.
In one of alternative embodiments of the invention at least one lever for bearing of said roller member is furnished with a protrusion, which is adapted to cooperate with said sensor, wherein said protrusion is formed to establish a contact with the sensor, when the roller member is located in its first position and the towing cable is tensioned, and is in any other position of the roller member, when the towing cable is not tensioned, located apart from said sensor.
In another alternative embodiment at least one lever for bearing said roller member is furnished with a protrusion , which is adapted to cooperate with said sensor, wherein said protrusion is displaced apart from said sensor, when the roller member is located in its first position and the towing cable is tensioned, but in any other position of said roller member, when the towing cable is not tensioned, said protrusion is brought in contact with the sensor.
The invention will be described in more detail by means of an embodiment, which schematically presented in the attached drawings, wherein
Fig. 1 is a perspective view of a motor-driven upper pulley block of a forestry winch with controlled decoiling of a towing cable; Fig. 2 is a side view of a partially shown forestry winch during decoiling of the towing cable, wherein the section of said towing cable in the area between the upper pulley block and the lower pulley block is tensioned; and
Fig. 3 is also a side view of a partially shown forestry winch during decoiling of the towing cable, wherein the section of said towing cable in the area between the upper pulley block and the lower pulley block is insufficiently tensioned i.e. not tensioned.
A forestry winch with controlled decoiling of a towing cable is presented in Fig. 1, wherein such winch comprises a frame 1 , in which a winding drum is rotationally embedded, around which a towing cable 2 is wound and which is driven by means of a cardan joint shaft of a tractor and controlled by means of a clutch and a brake. The drum as such drum is known to persons skilled in the art, and is therefore not separately shown in the attached drawing. A clutch and optionally also a transmission gear is foreseen between the shaft of said drum and said cardan joint.
The drum is furnished with a brake, wherein said clutch and said brake are adapted to operate in an alternative manner, which means that by coiling of the cable 2 around said drum and by activating the brake, the clutch is automatically deactivated and the drum is capable to rotate, while by releasing the clutch the brake is automatically activated. When the cable 2 is decoiled from said drum, the brake is deactivated, upon which the drum is allowed to rotate in opposite direction.
Besides, the winch is furnished with an upper pulley block 3, which is attached on said casing 1 and comprises a motor-driven pulley 3, as well as with a lower pulley block 4, which is also attached to said frame 1 below said upper pulley block 3 and is furnished with a freely rotatable pulley 40, so that the towing cable 2 extends from said winding drum via the upper pulley block 3 and via the lower pulley block 4 towards each particular load.
Said upper pulley block 3 is adapted for decoiling of the towing cable 2 when the brake is deactivated and the clutch is activated, by which the winding drum together with the towing cable 2 wound thereon becomes freely rotatable, upon which the user is allowed to extend the free end of said towing cable 2 towards the load and to couple it with the load.
In accordance with the present invention, and additional roller member 5 is foreseen between the upper pulley block 3 and the lower pulley block 4, which is adapted to cooperate with said towing cable 2 in the sense of being rolled along the surface of said towing cable 2. Said additional roller member 5 is rest on the surface of said towing cable 2, and is moreover pivotally embedded in said upper pulley block 3 in order to be pivoted between its first and second end position. Consequently, said additional roller member 5 is
- either forced, in particular thanks to its elastic supporting, maintained in its first position, in which a tangent to its circumferential surface 50 is aligned with a tangent to the pulley 30 of the upper pulley block 3 as well as with a tangent to a pulley 40 of a lower pulley block 4 and therefore extends in a direction along the towing cable 2 placed around the pulley 30 of the upper pulley block 3 and a pulley 40 of the lower pulley block 4,
- or is thanks to said elastic support pivoted away from its first position, in which a tangent to its circumferential surface 50 is aligned with a tangent to the pulley 30 of the upper pulley block 3 as well as with a tangent to a pulley 40 of a lower pulley block 4 and therefore extends in a direction along the towing cable 2 placed around the pulley 30 of the upper pulley block 3 and a pulley 40 of the lower pulley block 4, into its second position, which indicates that the cable 2 in the area between the upper pulley block 3 and the lower pulley block 4 is not tensioned.
At the same time, the invention provides that the winch is furnished with a sensor 6 for indicating a position of said additional roller member 5, namely at least for indicating, whether the roller member 5 is located in its first or second position, which then indirectly indicates, whether the towing cable 2 in the area between said pulley blocks 3, 4 is tensioned or not.
On the other hand, the pulley 30 of the upper pulley block 3 is driven by means of a motor 32, which is at least in a direction of decoiling of the towing cable 2 from the winding drum controlled on the basis of signals obtained from said sensor 6 for detecting of position of the roller member 5 as well as of each tension of the towing cable 2 in the area between the upper pulley block 3 and the lower pulley block 4. Said motor 32 for driving said pulley 30 of the upper pulley block 3 is preferably a hydraulic motor.
In a preferred embodiment of the invention, said additional roller member 5 is a roller, which is freely rotatable around its axis 50, wherein said axis 50 is mounted on a lever 51 , which is pivotally and in an elastically supported manner attached to a casing 31 of the upper pulley block 3 and by means of which the roller member 5 is pressed in a direction apart from the frame 1 and towards the towing cable 2, and wherein said lever 51 is adapted to cooperate with said sensor 6 for indicating each position of the roller member 5. A spring, by which said lever 51 is supported, is not separately shown in the drawings, but generally it is a tension or compression helical spring, or deflecting spring or any other suitable sufficiently resilient part. In a preferred embodiment of the invention according to Figs 1 - 3, said sensor 6 for indicating each position of the roller member 5 is an inductive sensor, which is adapted to detect the distance between it and the lever 51 bearing the roller member 5. The sensor 6 is preferably mounted on the casing 31 of the upper pulley block 3 adjacent to said lever 51, which bears the roller member 5.
In the embodiment of the winch as shown in Figs 1 - 3, at least one lever 51 for bearing said roller member 5 is furnished with a protrusion 510, which is adapted to cooperate with said sensor 6. The protrusion 510 is formed to establish a contact with the sensor 6, when the roller member 5 is located in its first position and the towing cable 2 is tensioned, and is in any other position of the roller member 5, when the towing cable 2 is not tensioned, located apart from said sensor 6.
An alternative embodiment is also possible, in which said at least one lever 51 for bearing said roller member 5 is furnished with a protrusion 510, which is adapted to cooperate with said sensor 6, wherein said protrusion 510 is displaced apart from said sensor 6, when the roller member 5 is located in its first position and the towing cable 2 is tensioned, but in any other position of said roller member 5, when the towing cable 2 is not tensioned, said protrusion 510 is brought in contact with the sensor 6.
In the practice, said motor 32 for driving the pulley 30 of the upper pulley block 3 can be controlled in such manner that it can be activated when the clutch on the shaft of the winding drum is deactivated and the drum is upon deactivation of the brake freely rotatable, by which the pulley 30 of the upper pulley block 3 is driven for the purposes to decoiling of the towing cable 2 from the winding drum until the sensor 6 for detecting of position of said additional roller member detects that the towing cable 2 in the area between the upper pulley block 3 and the lower pulley block 4 is no more tensioned. When the tension of the towing cable 2 in said area is terminated, energizing of the motor 32 of the upper pulley block 3 is automatically terminated.
Accordingly, any uncontrolled decoiling of the towing cable 2 from the winding drum is prevented in a reliable manner, by which formation of insufficiently tensioned sections of the towing cable is eliminated, and loops leading to damages or destroying of the towing cable 2 cannot be formed anymore.

Claims

PATENT CLAIMS
1. Forestry winch with controlled decoiling of a towing cable, comprising a frame (1) on which a winding drum with a towing cable (2) wound thereon is rotationally embedded and adapted to be driven by means of a cardan joint of a tractor and controlled by means of a clutch and a brake, and further comprising an upper pulley block (3) with an integrated motor driven upper pulley (30) and an lower pulley block (4) with an integrated freely rotatable pulley (40), so that said towing cable (2) extends from said winding drum via the upper pulley block (3) and the lower pulley block (4) towards each disposable load, characterized in that
an additional roller member (5) is arranged in the area between the upper pulley block (3) and the lower pulley block (4), and is adapted to be rolled along the surface of each disposable towing cable (2),
wherein said roller member (5), when resting on said surface of the towing cable (2), is pivotally i.e. with the possibility of swiveling between its first and second position mounted on said upper pulley block (3), and is
- either thanks to elastic supporting thereof, in particular by means of a spring, forced to remain in its first position, in which a tangent to its circumferential surface is aligned with a tangent to the pulley (30) of the upper pulley block (3) and with a tangent to the pulley (40) of the lower pulley block (4) and therewith with a direction of the towing cable (2) extending via the pulley (30) of the upper pulley block (3) and the pulley (40) of the lower pulley block (4);
- or is, thanks to elastic supporting thereof, swiveled from said first position, in which a tangent to its circumferential surface is aligned with a tangent to the pulley (30) of the upper pulley block (3) and with a tangent to the pulley (40) of the lower pulley block (4) and therewith with a direction of the towing cable (2) extending via the pulley (30) of the upper pulley block (3) and the pulley (40) of the lower pulley block (4), to its second position, which indicates that the towing cable between the upper pulley block (3) and the lower pulley block (4) is not tensioned,
and in that said winch further comprising a sensor (6) which is adapted for detecting each position of said additional roller member (5), namely at least for detecting, whether said roller member (5) is located in its first or second position.
2. Forestry winch according to Claim 1, characterized in that said pulley (30) of the upper pulley block (3) is driven by means of a motor (32), which is at least by operating in a direction of decoiling of the towing cable (2) from the winding drum controlled on the basis of signals received from the sensor (6) for detecting of each position of the roller member (5) and herewith also of the tension of the towing cable (2) in the area between the upper pulley block (3) and the lower pulley block (4).
3. Forestry winch according to Claim 2, characterized in that the motor (32) for driving of a pulley (30) of the upper pulley block (3) is a hydraulic motor.
4. Forestry winch according to anyone of Claims 1 to 3, characterized in that said additional roller member (5) is a roller, which is freely rotatable around its axis (50), wherein said axis (50) is mounted on at least one lever (51), which is pivotally embedded and elastically supported on the casing (31) of the upper pulley block (3), by means of which said roller member (5) is pressed in a direction away from the frame (1) and towards the towing cable (2), wherein said at least one lever (51) is adapted to cooperate with said sensor (6) for detecting of position of the roller member (5).
5. Forestry winch according to Claim 4, characterized in that said sensor (6) for detecting of position of the roller member (5) is an inductive sensor.
6. Forestry winch according to Claim 5, characterized in that said sensor (6) for detecting of position of the roller member (5) is attached on the casing (31) of the upper pulley block (3) adjacent to the lever (51), which bears the roller member (5).
7. Forestry winch according to Claim 6, characterized in that at least one lever (51) for bearing of said roller member (5) is furnished with a protrusion (510), which is adapted to cooperate with said sensor (6), wherein said protrusion (510) is formed to establish a contact with the sensor (6), when the roller member (5) is located in its first position and the towing cable (2) is tensioned, and is in any other position of the roller member (5), when the towing cable (2) is not tensioned, located apart from said sensor (6).
8. Forestry winch according to Claim 6, characterized in that at least one lever (51) for bearing said roller member (5) is furnished with a protrusion (510), which is adapted to cooperate with said sensor (6), wherein said protrusion (510) is displaced apart from said sensor (6), when the roller member (5) is located in its first position and the towing cable (2) is tensioned, but in any other position of said roller member (5), when the towing cable (2) is not tensioned, said protrusion (510) is brought in contact with the sensor (6).
PCT/SI2013/000029 2012-05-29 2013-05-13 Forestry winch with controlled decoiling of a towing cable WO2013180664A1 (en)

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EP13748379.8A EP2855335B1 (en) 2012-05-29 2013-05-13 Forestry winch with controlled decoiling of a towing cable

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SIP-201200170 2012-05-29
SI201200170A SI24107A (en) 2012-05-29 2012-05-29 Forestry winch with controlled decoiling of a towing cable

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SI24539A (en) 2013-11-08 2015-05-29 Tajfun Planina Proizvodnja Strojev, D.O.O. Logging winch with improved management of stretching a rope in the area of upper pulley

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SI9600339A2 (en) 1996-11-19 1998-06-30 Tajfun Planina Proizvodnja Strojev, D.O.O. Winch, particularly forestry winch featuring improved rope guide
JP2004217422A (en) * 2002-11-21 2004-08-05 Nihon Bisoh Co Ltd Rope winder, gondola device and curing net lifting device using this winder
WO2009072992A2 (en) * 2007-12-04 2009-06-11 Uniforest, D.O.O. Driving gear for rope unwinding on forestry windlasses
SI22800A (en) 2008-06-03 2009-12-31 Tajfun Planina Proizvodnja Strojev, D.O.O. Hydraulic driving and guiding assembly of a line supporting element, in particularly pulley of a forestry winch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SI9600339A2 (en) 1996-11-19 1998-06-30 Tajfun Planina Proizvodnja Strojev, D.O.O. Winch, particularly forestry winch featuring improved rope guide
JP2004217422A (en) * 2002-11-21 2004-08-05 Nihon Bisoh Co Ltd Rope winder, gondola device and curing net lifting device using this winder
WO2009072992A2 (en) * 2007-12-04 2009-06-11 Uniforest, D.O.O. Driving gear for rope unwinding on forestry windlasses
SI22800A (en) 2008-06-03 2009-12-31 Tajfun Planina Proizvodnja Strojev, D.O.O. Hydraulic driving and guiding assembly of a line supporting element, in particularly pulley of a forestry winch

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EP2855335B1 (en) 2015-10-14
EP2855335A1 (en) 2015-04-08
SI24107A (en) 2013-12-31

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