EP3912951A1 - Riemenscheibe mit verschlussklappe und winde mit dieser riemenscheibe - Google Patents

Riemenscheibe mit verschlussklappe und winde mit dieser riemenscheibe Download PDF

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Publication number
EP3912951A1
EP3912951A1 EP21174626.8A EP21174626A EP3912951A1 EP 3912951 A1 EP3912951 A1 EP 3912951A1 EP 21174626 A EP21174626 A EP 21174626A EP 3912951 A1 EP3912951 A1 EP 3912951A1
Authority
EP
European Patent Office
Prior art keywords
pulley
closure flap
housing
locking pin
winch
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.)
Pending
Application number
EP21174626.8A
Other languages
English (en)
French (fr)
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
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 Pisek Vitli Krpan doo filed Critical Pisek Vitli Krpan doo
Publication of EP3912951A1 publication Critical patent/EP3912951A1/de
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D3/00—Portable or mobile lifting or hauling appliances
    • B66D3/04—Pulley blocks or like devices in which force is applied to a rope, cable, or chain which passes over one or more pulleys, e.g. to obtain mechanical advantage
    • B66D3/046—Openable pulley blocks

Definitions

  • the invention belongs to the field of forestry winches, more precisely to the field of constructional details in winches, which are related to pulling a load by winding the rope onto a drum via a pulley.
  • the invention relates to a pulley with a closure flap and a winch with the said pulley.
  • Pulleys for guiding a rope, which is used for pulling a load.
  • Pulleys usually comprise a housing, inside which a sheave is installed, said sheave being freely rotatable around its central axis.
  • a rope that is winding or unwinding from the drum runs on the sheave.
  • the rope often fails to wind in a straight manner, but comes at different angles, which may result in disengaged rope from the sheave. In extreme cases the rope may be torn, consequently leading to a damaged winch.
  • Lower pulleys in winches serve to decrease the centre of gravity of the pulling force during pulling of a load with the forestry winch and thus represent an important part of winches that ensure reliable load pulling. Due to the occasional use a lower pulley has to be prepared for a fast and simple use, hence, that it is opened quickly, the rope is installed in place and then the pulley is closed. The rope has to be reliably hidden in the housing of the pulley in order to prevent derailing and possible tearing.
  • the technical problem which is solved by the present invention, is a constructional design of a pulley for a forestry winch that will have a safety element for preventing the rope from derailing (falling out) of the pulley, wherein the invention has to enable installation of the rope in a fast and simple manner.
  • the said safety mechanism comprising a pin installed through openings on the both sides of the pulley housing, wherein the pin covers a diameter larger than the diameter of the sheave. Control of the pin is ensured with a stem equipped with a compression spring and a restrictor.
  • the problem of this design is in that the stem with the spring and the restrictor protrudes from the housing, due to which the safety mechanism can deform and cease to optimally operate.
  • the safety mechanism comprises at least a pin and a stem with an integrated spring, which are firmly interconnected.
  • the pin can be past the pulley inserted through the coaxial openings, which are at corresponding locations available in the mutually displaced walls of the housing, while through the specified walls an axis is running through the freely rotating pulley.
  • the stem is rigidly connected to the aforementioned pin, which can be shifted in the direction of its longitudinal axis from the position of fitting the aforementioned openings in the walls of the housing to the position of fitting only one opening in the wall against the spring force, which is during this supported against the corresponding wall of the housing.
  • the stem is on its free end inside the housing equipped with a restrictor, wherein the step is parallel to the pin and inserted through openings in the corresponding wall on that side of the housing, which the pin can be moved to against the force of the aforementioned spring, while the specified stem with the pin is firmly connected via a link located outside the housing.
  • This solution differs from the present invention in the construction of the closure flat and the locking element.
  • the pulley with the closure flap comprises a housing, inside which a freely rotatable sheave for leading a rope is installed in an axis.
  • the housing is movably mounted on a winch or any other device suitable for pulling a load with a rope and a pulley.
  • the closure flap is installed via a bolt of the pulley, which allows movement of the pulley when it is installed on a winch, which means that the rotation movement of the lower pulley and the closure flap is the same.
  • the closure flap may be installed via a pivot or a hinge on the housing of the pulley, however, the installation via the bolt is preferred due to its simplicity and price.
  • the closure flap has an open position and a closed position, and switching between both positions is enabled with a locking pin.
  • the closure flap is locked to the housing of the lower pulley with the locking pin, the pulley and the flap move together as a single entity.
  • the closure flap is not fixed with the locking pin, it can be moved independently from the lower pulley.
  • the closure flap is preferably shaped as an approximate right-angled triangle, wherein the hypotenuse is curved to correspond to the shape of the sheave or the housing of the pulley, respectively. This results in the flap covering a significant part of the housing with the sheave, which prevents derailing of the rope from the sheave or even tearing of the rope.
  • an ear with a hole is provided, preferably screwed or welded, the said hole being arranged to receive a part of the locking pin, which locks the flap in place.
  • the flap can be opened and thus the rope may be installed into the housing of the pulley.
  • the closure flap may be alternatively shaped as a rectangle or any other geometrical shape, wherein it may cover at least a part of the pulley or is installed to be near the edge of the housing.
  • the triangular part may be equipped with any other suitable element, which allows interaction with the pin, so that the pin can be engaged (stuck) in place in the locked position, whereas the pin is not engaged (is removed) in the open position.
  • the locking pin may be designed in any suitable way allowing the closure flap is locked or unlocked. It may be designed to have a housing in the shape of a hollow screw, wherein a spring is installed in the said hollow screw, and an inner part, which can be raised and lowered depending on the state of the spring and required position of the flap (open/closed), wherein the pin interacts with the hole in the ear of the flap depending of the open/closed position.
  • a spring is installed in the said hollow screw
  • an inner part which can be raised and lowered depending on the state of the spring and required position of the flap (open/closed)
  • the pin interacts with the hole in the ear of the flap depending of the open/closed position.
  • In the closed position the inner part of the pin is pushed downwards with the spring, so that the pin is stuck in the hole of the bottom part of the flap, thus closing and locking the flap.
  • the inner part In the open position the inner part is raised and released from the hole, which unlocks the flap and opens it.
  • the locking pin is preferably with nuts or any other way mounted into a corresponding hole, a bore or an ear of the housing of the pulley.
  • the pin is according to a second, preferable embodiment similar to the first embodiment; with the difference being that no rotation is required for unlocking. Rather, the inner part of the pin is gripped with fingers and pulled out. In case the inner part of the pin is released, the spring pulls it back and pushes it in the hole thereby locking the position.
  • closure flap Operation of the closure flap is carried out in the following way:
  • the described solution is particularly suitable for bottom pulleys of forestry winches, which are not constantly used, but has to be adapted to the pulled load and work with the winch.
  • the design of the closing flap and the locking pin can be used in other types of pulleys.
  • the pulley with the closure flap may be installed in any winch or tractor, wherein the winch may have one or several drums.
  • pulley with the closure flap in a closed position is shown in figure 1 , wherein the pulley comprises at least:
  • Figure 2 shows a pulley with a closure flap 1 from figure 1 shown in an open state of the flat, so that the locking pin 3, which is preferably shaped as a hollow screw, wherein for its unlocking rotation is not needed, but is rather gripped with fingers and pulled out.
  • the locking pin 3 has an inner part, which can be moved in relation to the condition of the spring. When the inner part is pulled out, the spring is compressed and the pin is released from the hole 12a' of the ear 12a, thus allowing the flap 1 to be opened. In case the pin 3 is released upon closure of the flap 1, the spring pulls it back into the hole 12' and locks the position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)
EP21174626.8A 2020-05-21 2021-05-19 Riemenscheibe mit verschlussklappe und winde mit dieser riemenscheibe Pending EP3912951A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SI202000089A SI26003A (sl) 2020-05-21 2020-05-21 Škripec z zapiralno loputo in vitel z omenjenim škripcem

Publications (1)

Publication Number Publication Date
EP3912951A1 true EP3912951A1 (de) 2021-11-24

Family

ID=76641566

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21174626.8A Pending EP3912951A1 (de) 2020-05-21 2021-05-19 Riemenscheibe mit verschlussklappe und winde mit dieser riemenscheibe

Country Status (2)

Country Link
EP (1) EP3912951A1 (de)
SI (1) SI26003A (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115321404A (zh) * 2022-08-31 2022-11-11 安徽省中冶重工机械有限公司 打桩船专用万向多功能安全滑车

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1672823A (en) * 1927-08-12 1928-06-05 Thomas A Mcmillan Fiddle snatch block
US1908784A (en) * 1931-11-13 1933-05-16 Peterson Joseph Quick-opening snatch block
US3372908A (en) * 1967-02-27 1968-03-12 Norco Inc Quickly openable snatch block
WO2008118105A1 (en) * 2007-03-23 2008-10-02 Tajfun Planina Proizvodnja Strojev, D.O.O. Pulley block

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1672823A (en) * 1927-08-12 1928-06-05 Thomas A Mcmillan Fiddle snatch block
US1908784A (en) * 1931-11-13 1933-05-16 Peterson Joseph Quick-opening snatch block
US3372908A (en) * 1967-02-27 1968-03-12 Norco Inc Quickly openable snatch block
WO2008118105A1 (en) * 2007-03-23 2008-10-02 Tajfun Planina Proizvodnja Strojev, D.O.O. Pulley block

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115321404A (zh) * 2022-08-31 2022-11-11 安徽省中冶重工机械有限公司 打桩船专用万向多功能安全滑车

Also Published As

Publication number Publication date
SI26003A (sl) 2021-11-30

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