EP3819254B1 - Symmetrical pulley with unlimited rotation having a mechanism for terminating winding of a rope and a winch comprising the said pulley - Google Patents

Symmetrical pulley with unlimited rotation having a mechanism for terminating winding of a rope and a winch comprising the said pulley Download PDF

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Publication number
EP3819254B1
EP3819254B1 EP20204196.8A EP20204196A EP3819254B1 EP 3819254 B1 EP3819254 B1 EP 3819254B1 EP 20204196 A EP20204196 A EP 20204196A EP 3819254 B1 EP3819254 B1 EP 3819254B1
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EP
European Patent Office
Prior art keywords
rope
pulley
onto
parts
drum
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.)
Active
Application number
EP20204196.8A
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German (de)
English (en)
French (fr)
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EP3819254A1 (en
Inventor
Franc Pisek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pisek Vitli Krpan doo
Original Assignee
Pisek Vitli Krpan doo
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Publication date
Application filed by Pisek Vitli Krpan doo filed Critical Pisek Vitli Krpan doo
Priority to HRP20231427TT priority Critical patent/HRP20231427T1/hr
Priority to SI202030313T priority patent/SI3819254T1/sl
Priority to RS20231052A priority patent/RS64805B1/sr
Publication of EP3819254A1 publication Critical patent/EP3819254A1/en
Application granted granted Critical
Publication of EP3819254B1 publication Critical patent/EP3819254B1/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

Definitions

  • the present invention belongs to the field of forestry winches, more particularly to the field of constructional details in forestry winches, which are related to pulling a load by winding a rope onto a drum via a pulley.
  • the invention relates to a symmetrical pulley with unlimited rotation and having a mechanism for terminating winding of a rope as well as to a winch comprising the said pulley.
  • Termination or suspension of pulling of a load via winding of a pulling rope onto a drum is often required during use of a winch. It may occur that the user does not timely stop the winding, which leads to the rope being stuck in the already wound coils on the drum or the end of the rope gets teared off. At the same time other constructional elements, such as the guide of the pulling rope, may be damaged. Consequently, work has to be terminated and the damaged parts have to be repaired or exchanged if the deformation is permanent.
  • Symmetrical pulleys with unlimited rotation do not have mechanisms for automatic stopping, suspending or terminating winding of a pulling rope onto the drum of the winch, which would be triggered by closing of the end part of the rope to the pulley, while the known solutions for pulleys with limited movement due to different construction are not suitable for symmetrical pulleys with unlimited rotation. Therefore, the technical problem, which is solved by the present invention, is constructional design of a mechanism for terminating winding of the rope, which will be suitable for a symmetrical pulley with unlimited rotation.
  • Patent SI 24805 describes a pulley of a forestry winch with a freely-rotatable housing around the symmetry axis in a fixed housing, having a sensor installed onto the fixed housing. Opposite the sensor the rotatable housing is provided with a ring that can be moved in the direction of the symmetry axis for activating the said sensor.
  • the ring is connected with a ring guide, which is movable in the direction of the symmetry axis and in contact with a collision lever.
  • a spring installed on the ring guide ensures a larger distance from the ring from the sensor.
  • the plate attached to the rope hits the collision lever and moves it in the direction of pulling of the rope, which moves the ring guide and the ring towards the sensor.
  • the ring activates the sensor, which via a control unit terminates pulling and winding of the rope onto the drum of the forestry winch.
  • the mentioned patent describes a non-symmetrical pulley (1), in which only one sheave (5) and pushing sheave (6) is used.
  • the mass centre of the rotating part of the pulley is thus out of the axis of rotation.
  • the rotating part of the housing has a tendency to rotate in such a way that the sheave (5) is under the axis.
  • termination of winding is not reliable.
  • the rope is located inside the working area shown by the triangle in figure 1 , rotation of the pulley is disabled, as the force in the rope has no lever force with regards to the axis of rotation, therefore the pulley does not rotate.
  • Document KR20120042370 relates to a pulley device for a transport system with a symmetrical pulley with unlimited rotation having a mechanism for terminating winding of a rope onto a drum, wherein the said pulley comprises a fixed part for mounting onto a winch housing or a ramp board, and a rotatable part connected with the fixed part via a bearing; said rotatable part having two equally sized sheaves, each inside a sheave housing and two rollers installed above the said sheaves for directing the rope and positioning the rotatable part of the pulley.
  • the roller bracket includes a sensing unit capable of detecting the initial position of the wire in the second wire lead-in/out portion.
  • Document US2005258302 describes a rotatable cable guide with cable switching feature.
  • a cage in which two pulley wheels are mounted with tangent circumferences so that their circumferential cable grooves surround a cable passing between the wheels.
  • the cage freely rotates about an axis that passes between the wheels.
  • the cage axis is normal to the plane of the parallel wheel axes.
  • the cage extends forward of the wheels and forms two curved edges on opposed sides of the cage axis. Each curve has an apex at its forward-most point.
  • a flexible cable passes through the cage, between the wheels, and forward between the curves. Extending the cable substantially away from the plane of the wheels causes it to contact one of the curves. This rotates the cage so that the wheels are aligned with the cable deflection. This switches the cable to one or the other of the wheels, and provides low friction cable operation for any cable direction.
  • the present invention is based on a symmetrical pulley, which differs from the asymmetrical pulleys in its design, shape and operation.
  • the technical problem is solved as defined in the independent claim, while the preferred embodiments of the invention are defined in the dependent claims.
  • the symmetrical pulley with unlimited rotation comprises a fixed part, which is attached, usually screwed, to the winch frame or a ramp board, and a rotatable part.
  • the rotatable and the fixed part are connected with a bearing or a sliding bushing in the same way as is known in the field of freely rotatable pulleys.
  • the essence of the symmetrical pulley with unlimited rotation with the mechanism for terminating winding of a rope is in that the pulley is symmetrical with two equally sized sheaves for leading the rope, wherein the sheaves are installed in a housing in the rotatable part, due to which the mass centre of the pulley is on the axis of rotation.
  • rollers At the exit of the pulley, i.e. above the sheaves, preferably two rollers are provided, which serve to direct the rope and to position the rotatable part of the pulley.
  • the rollers are preferably mounted onto the housing of the sheaves with holders using suitable screws. In case the rollers are present the wear of the rope is lower. If they are absent, the rope runs on the mechanical part of the pulley.
  • the two-part collision piece is provided, having any suitable shape, wherein the collision piece is rotatably mounted at the sides of the pulley or the housing of the sheaves.
  • Both parts of the collision part are shaped correspondingly to the shape of sheave housing and/or rollers, and they form a suitable opening for the rope in the middle.
  • the opening may have any shape.
  • both parts of the collision piece are shaped as parts with a corresponding cut-out, for example as a comb.
  • One of the possible embodiments of the collision parts is that they are shaped as a letter U, both legs of which are shaped as a comb, while a long opening is provided in-between, in which the rope may run towards the drum.
  • the collision part after interaction with an end part of the rope moves the lever connected with the ring installed on the movable part so that it can embrace the fixed part of the pulley, wherein the ring is moved towards at least one sensor on the fixed part of the pulley. Consequently, the said ring terminates the signal of the sensor and thus causes a termination of the winding of the rope.
  • the two-part collision part enables reliable termination of winding regardless of the pulley or the direction from which the rope is coming.
  • the vertical rollers and the opening in the collision part enable that the rope turns the pulley in such a way, that the rope is lead via a sheave.
  • the rope can never slide on the collision part, if the winch is pulling in the transverse direction (rotation of the pulley is directed by the rope weight). If the winch pulls in such a way that the rope is in the vertical plane, the upper sheave is active during pulling upwards, while the lower sheave is used during pulling downwards. In case the end part of the rope hits into the collision part, both parts are moved downwards, which causes a movement of the lever, which pushes the ring towards the sensor or the switch, thus terminating the winding of the rope.
  • the mechanism for terminating winding of the rope returns to its original state due to a spring, which is installed between both handles of the lever, so that they are moved apart and the ring is pulled above the sensors.
  • the spring may be tension, compression, gas or any other spring that enables return of the mechanism into its original state.
  • a hydraulic cylinder with a hydraulic accumulator could also be used, but such embodiments are more demanding and complicated.
  • the collision part may be designed in any suitable way so that its parts equally cover the sheaves or the rollers, if they are present, which enables a reliable termination of rope winding regardless of the position of the pulley and regardless of the direction from which the rope is coming.
  • the lever connecting the collision part with the ring may be shaped in any suitable way, preferably it is designed as two handles, movably connected with each other, which are on one side mounted on the collision parts and on the other side to the ring, which can at least partially cover the sensor in the fixed part, in case the end part of the rope hits the collision part.
  • the handles may be connected to the ring via a second intermediate part, which can move in the direction of the rope towards and away from the drum.
  • the second intermediate part preferably comprises a middle part and two side parts, each of which is connected with its own handle of the lever.
  • any type of sensor can be used, preferably inductive, magnetic, capacitive or optical.
  • the sensor may also be replaced by switches or similar elements for terminating winding of the rope. At least one such element has to be present, preferably two, as this ensures more reliable operation in case of malfunction of one of them.
  • the symmetrical pulley with unlimited rotation with the mechanism for terminating winding of a rope can be installed in any winch or tractor, wherein the winch may have one or more drums. In case of two drum winches the pulleys are installed at a pre-defined distance, as is known in this technical field.
  • Figure 1 shows a known solution of an asymmetrical pulley with unlimited rotation having the above-described disadvantages.
  • the embodiment with one collision part or single part collision piece is not suitable for symmetrical pulleys, as due to the single mounting such collision piece cannot ensure a reliable termination or suspension of winding of the rope in any position of the pulley.
  • pulley 2 comprises:
  • the sheaves are installed inside their own housing 221a, 221b (behind their housing and not shown in the figure) and inside the protection of the lever 26 of the pulley 221, while rollers 222 are installed via holders with suitable screws onto the housing of the sheaves 221a,b.
  • the collision part 223 comprises two equal parts, which have the shape of an approximate letter U, of which both legs are shaped as a comb 223G, while along the middle a long opening is provided, along which the rope can run towards the drum of the winch.
  • Both parts in the shape of the letter U are curved, so that they correspond to the shape of the rollers 222 and sheave housing 221a,b, while the mounting 224 is carried out at the sides of the sheave housing 221a,b or the pulley protection 221 in any suitable way, which allows movement of both collision parts 223 upon interaction with the ending of the rope.
  • the preferred embodiment is with an axis, mounted in the housing 221 of the pulley 2 and the collision part 223 and attached with screws or suitably long screw and a nut.
  • Figure 3 shows an elevation view of the pulley 2, wherein the lever 226 connecting both collision parts 223 with the ring 225 is visible, the ring 225 being able to activate at least one sensor 21a on the fixed part 21.
  • the collision parts are wider in the side part of the pulley and in the mounting, wherein they are narrower in the part above the rollers.
  • the lever On each side of the pulley 2 the lever is mounted, so that the pressure on the ring is symmetrical.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)
  • Control And Safety Of Cranes (AREA)
EP20204196.8A 2019-11-05 2020-10-27 Symmetrical pulley with unlimited rotation having a mechanism for terminating winding of a rope and a winch comprising the said pulley Active EP3819254B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
HRP20231427TT HRP20231427T1 (hr) 2019-11-05 2020-10-27 Simetrični kolotur s neograničenom rotacijom koji ima mehanizam za okončanje namatanja užeta te vitlo koje sadržava navedeni kolotur
SI202030313T SI3819254T1 (sl) 2019-11-05 2020-10-27 Neskončno vrtljiv simetrični škripec z mehanizmom za zaustavitev navijanja vrvi in vitel z omenjenim škripcem
RS20231052A RS64805B1 (sr) 2019-11-05 2020-10-27 Simetrični kotur sa neograničenom rotacijom koja ima mehanizam za zaustavljanje namotavanja užeta i vitlo koje se sastoji od navedenog kotura

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SI201900210A SI25933A2 (sl) 2019-11-05 2019-11-05 Neskončno vrtljiv simetrični škripec z mehanizmom za zaustavitev navijanja vrvi na boben vitla in vitel z omenjenim škripcem

Publications (2)

Publication Number Publication Date
EP3819254A1 EP3819254A1 (en) 2021-05-12
EP3819254B1 true EP3819254B1 (en) 2023-08-16

Family

ID=73475847

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20204196.8A Active EP3819254B1 (en) 2019-11-05 2020-10-27 Symmetrical pulley with unlimited rotation having a mechanism for terminating winding of a rope and a winch comprising the said pulley

Country Status (8)

Country Link
EP (1) EP3819254B1 (fi)
DK (1) DK3819254T3 (fi)
FI (1) FI3819254T3 (fi)
HR (1) HRP20231427T1 (fi)
HU (1) HUE064232T2 (fi)
PL (1) PL3819254T3 (fi)
RS (1) RS64805B1 (fi)
SI (2) SI25933A2 (fi)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116730108B (zh) * 2023-08-14 2023-10-24 安徽博诺思信息科技有限公司 一种电力施工架线用放线滑轮结构

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US658908A (en) * 1900-05-12 1900-10-02 Lisena Alice Fenner Rope or cable guide.
US1433751A (en) * 1921-08-22 1922-10-31 Parsons Co Ralph M Swivel fair lead
US7118094B2 (en) * 2004-05-21 2006-10-10 Space-Age Control, Inc. Rotatable cable guide with cable switching feature
KR101245756B1 (ko) * 2010-10-25 2013-03-25 삼성중공업 주식회사 와이어를 이용한 이송 시스템용 도르래 장치 및 그의 와이어 초기 위치 셋팅 방법
KR20130034172A (ko) * 2011-09-28 2013-04-05 현대제철 주식회사 크레인의 중추 리미트
SI24997A (sl) 2015-05-22 2016-11-30 PIĹ EK - VITLI KRPAN, d.o.o. Vitel z varnostnim mehanizmom za izklop navijanja vrvi

Also Published As

Publication number Publication date
HRP20231427T1 (hr) 2024-02-16
RS64805B1 (sr) 2023-11-30
HUE064232T2 (hu) 2024-02-28
SI25933A2 (sl) 2021-05-31
DK3819254T3 (da) 2023-11-13
EP3819254A1 (en) 2021-05-12
FI3819254T3 (fi) 2023-11-15
PL3819254T3 (pl) 2024-02-26
SI3819254T1 (sl) 2024-01-31

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