EP3395746B1 - Palan à chaîne - Google Patents

Palan à chaîne Download PDF

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Publication number
EP3395746B1
EP3395746B1 EP18165582.0A EP18165582A EP3395746B1 EP 3395746 B1 EP3395746 B1 EP 3395746B1 EP 18165582 A EP18165582 A EP 18165582A EP 3395746 B1 EP3395746 B1 EP 3395746B1
Authority
EP
European Patent Office
Prior art keywords
chain
chain hoist
shaft
threaded washer
housing
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
EP18165582.0A
Other languages
German (de)
English (en)
Other versions
EP3395746A1 (fr
Inventor
Klaus C. Uebel
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.)
Heinrich de Fries GmbH
Original Assignee
Heinrich de Fries GmbH
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 Heinrich de Fries GmbH filed Critical Heinrich de Fries GmbH
Publication of EP3395746A1 publication Critical patent/EP3395746A1/fr
Application granted granted Critical
Publication of EP3395746B1 publication Critical patent/EP3395746B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B66D3/12—Chain or like hand-operated tackles with or without power transmission gearing between operating member and lifting rope, chain or cable
    • B66D3/14—Chain or like hand-operated tackles with or without power transmission gearing between operating member and lifting rope, chain or cable lever operated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/12—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect
    • B66D5/14—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect embodying discs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/32—Detent devices
    • B66D5/34—Detent devices having latches

Definitions

  • the invention relates to a chain hoist for lifting, lowering and pulling loads according to the preamble of patent claim 1.
  • Components of such a chain hoist as in a typical design of the DE 33 23 110 A1 is known, provided with a hook as an abutment element housing, a drive shaft rotatably mounted therein, a drive shaft coupled to the drive lever, and a rotatable by the drive shaft in sprocket over which is provided with a hook load chain of the chain hoist.
  • the drive lever can be coupled to the drive shaft via a ratchet mechanism.
  • chain hoists usually have a freewheel, by the switching of which the drive shaft is decoupled from the drive lever or the ratchet mechanism.
  • the DE 33 23 110 A1 discloses the preamble of independent claim 1.
  • chain hoists are used to raise or lower loads.
  • Generic chain hoists also have a manually switchable freewheel. In freewheeling position, the chain can be pulled freely in one direction or the other.
  • chain hoists have an automatically acting load pressure brake. This is a mechanism that prevents the freewheel from starting when a load is still hanging on the sprocket and therefore a minimum torque is applied to the drive shaft. The load pressure brake prevents the drive shaft and thus the weight load from being released by accidentally switching on the freewheel.
  • the invention has for its object to make a contribution by technical measures on the chain hoist to defuse dangerous albeit rare extreme situations, as they can occur especially when the freewheel.
  • Such a chain hoist is characterized by an integrated, load pressure and speed-dependent brake.
  • the speed is limited, with which the load chain in the case of activated freewheel device, can out-roar. Too rapid noise of the load chain is associated with the risk that their other, free end begins to beat (whip effect), thereby endangering people.
  • the freewheel device is designed to increase the axial distance between the threaded disk and the drive shaft arranged on the central shaft by rotating the threaded disk on the external thread of the central shaft.
  • the spring is a centrifugal elements together enclosing annular spring. This allows a simple design with few items and low imbalances in operation.
  • the centrifugal elements are arranged in radially outwardly open recesses of the threaded disc.
  • the centrifugal elements are circumferentially supported against walls of the recesses to ensure the rotationally fixed arrangement of the centrifugal elements with respect to the threaded disc.
  • Part of the chain hoist is inter alia a housing 1, which is composed of a plurality of housing plates 2A, 2B, 2C and 2D and other housing parts.
  • the housing plates 2A, 2B, 2C, 2D are interconnected by bolts 3 which pass through openings near the outer edges of the housing plates.
  • the bolts 3 are arranged parallel to one another and guided transversely through the housing plates 2A, 2B, 2C, 2D, whereby the housing plates are pulled against each other and connected with further housing parts in total to a housing 1 which is closed towards the outside.
  • an abutment element in the form of a secured by a carabiner hook 5 is fixed so that the hook 5 is tensile strength, but pivotally connected to the housing 1.
  • a drive shaft 10 arranged on a central axis A passes.
  • the drive shaft 10 is rotatably mounted in at least some of the housing plates.
  • a drive lever 11 is present at one end of the chain hoist, which is provided at its free end with a rubberized handle.
  • the drive lever 11 is coupled via gear elements and partly also locking elements with the drive shaft 10 to enable by pivoting the drive lever, the drive shaft 10 in rotation.
  • a ratchet mechanism of two movable pawls is formed in such a way that the drive lever 11 entrains the drive shaft 10 by means of a pawl when rotated in the one circumferential direction, but decouples this pawl when rotated in the opposite direction, and then blocks another pawl instead.
  • a freewheel device 12 serves for rotational decoupling of the drive shaft 10 so that it can normally rotate freely.
  • the freewheel device is first released via a switching lever 13 on the drive lever 11, and then switched on via a coaxially arranged on the shaft 10 shift knob 14.
  • the shift knob 14 is first tightened slightly in the longitudinal direction of the shaft 10, and then rotated, whereby the freewheel turns on.
  • the drive shaft 10 is provided with a pinion, which is part of a reduction gear 15.
  • the transmission 15 is in a transmission housing connected to the first housing plate 2 A and transmits the rotation of the drive shaft 10 in a slower rotation of a transmission output shaft.
  • the gear output shaft is in turn rotationally fixed to a sprocket 17.
  • the sprocket 17 is located between the housing plates 2A and 2B and preferably rotates coaxially with the shaft 10, but at a different speed.
  • the sprocket 17 may be mounted via a rolling bearing on the centrally passing through the sprocket 17 drive shaft 10.
  • the sprocket 17 is provided with evenly distributed over its circumference mold recesses for the individual chain links formed as a link chain load chain 20.
  • a towing hook 21 At one end of the load chain 20 is provided with a towing hook 21, which may be secured with a carabiner.
  • a blocking block At the other end of the load chain 20 shown only schematically in the drawing, a blocking block can be attached, which prevents complete release of the load chain 20 of the sprocket 17.
  • the threaded disc 22 is provided with an internal thread which is screwed to an external thread 23 of the shaft 10.
  • This screw is preferably a multi-start screw with a relatively large pitch, whereby the threaded disc 22 is relatively easy to screw against the shaft 10.
  • the threaded disc 22 is provided with teeth of a drive toothing 26.
  • the drive teeth 26 can engage a switchable pawl 27 which is formed on the switching lever 13, which in turn is arranged on the manual drive lever 11.
  • the drive lever 11 is here so the actual force-applying element.
  • the pawl 27 is connected either in one direction of rotation, or in the other direction of rotation with the drive teeth 26, or the ratchet teeth of the pawl 27 are in the Freewheeling position of the freewheel device 12, completely out of engagement with the drive teeth 26th
  • the threaded disc 22 is also part of a brake, which mainly serves as a load pressure brake.
  • a brake disk 25 which is arranged axially between a driving surface 22A formed on the threaded disk 22 and a drive surface 10A.
  • the brake disk 25 has a first braking surface directed against the driving surface 10A, and toward the other side a second braking surface directed against the driving surface 22A of the rotating disk 22.
  • the drive surface 10A is either part of the shaft 10, or rotatably in a suitable manner to the shaft 10.
  • On both sides of the brake disc 25 may be arranged additional, the braking effect improving friction, as shown in Fig. 3 is reproduced.
  • ratchet teeth 25A Distributed over the circumference of the brake disk 25, this is provided with ratchet teeth 25A.
  • the ratchet teeth 25A are formed for a one-sided blocking engagement of a pawl 28 mounted on the housing 1. Instead of a pawl 28 and two such pawls 28 may be present.
  • the chain hoist has a freewheel device 12 with self-acting load pressure brake. Both are in details z. B. in the DE 33 23 110 A1 to which reference is made.
  • the load pressure brake regardless of the operation of the shift knob 14 of the freewheel device 12, the actual freewheel of the shaft 10 then and as long as the sprocket 17 still has a minimum load, and therefore at the central shaft 10 is applied a corresponding torque. Therefore, the load pressure brake operates as far as the shaft 10 still acts a certain minimum torque and prevents in this way that by accidentally switching on the freewheel the central shaft 10 and thus the hanging on the tow hook 21 weight load is released.
  • the chain hoist has an additional safety device in addition to the load pressure brake.
  • This consists of two arranged on the threaded disc 22 and rotating at the speed of the threaded disc centrifugal elements 31, 32.
  • the centrifugal elements 31, 32 are, against a spring force, until it rests against a Threaded disc 22 coaxially surrounding braking surface 33 is movable.
  • This braking surface 33 is formed on the inside of the housing 1.
  • the braking surface 33 is located on the cylindrical inner wall of a housing ring 35, which is integrally fixed to the housing plate 2C and has a smaller diameter than the rest of the housing plate 2C.
  • the safety device operates with a total of two centrifugally extending radially to each other centrifugal elements 31, 32, each extending over slightly less than half the circumference of the threaded disc 22.
  • the centrifugal elements 31, 32 are mounted in recesses of the threaded disc 22.
  • centrifugal elements 31, 32 are movable outwardly according to the magnitude of the centrifugal forces. By contrast, they are supported by means of corresponding rigid stops in the circumferential direction and therefore rotationally fixed with respect to the threaded disc 22nd
  • the centrifugal elements 31, 32 are connected to each other by an annular spring 39 guided around them.
  • the strength of this spring 39 determines the speed at which the centrifugal elements abut at high speeds of more than 250 U / min and preferably more than 400 U / min against the housing-fixed, cylindrical braking surface 33, and therefore the threaded disc 22 is braked.
  • the sudden deceleration of the threaded disc 22 is unable to follow the shaft 10 rotating at high torque and high speed about the axis A due to its own inertia and the inertia of the masses rotating together with the shaft 10. It comes in no time, namely in fractions of a second, to a relative rotation between the - still - rotating shaft 10 and stopped abruptly Threaded disc 22. As a result draws in a very short time, the helical, still rotating external thread 23, the threaded disc 22 in the direction of the brake disc 25. The brake closes, as if the load pressure brake suddenly activated.
  • the advantage of the chain hoist described here is that a load pressure and speed-dependent brake is provided.
  • the speed at which the load chain 20 can escape, even in the case of activated freewheel device, is limited. Above all, a faster and faster moving load chain 20 is prevented, with the risk that its other end will begin to beat (whip effect), thereby endangering persons in the vicinity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Load-Engaging Elements For Cranes (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)

Claims (7)

  1. Palan à chaîne pour le levage, l'abaissement et la traction de charges, comprenant :
    un boîtier (1), dans lequel sont logés de manière rotative une roue dentée (17), qui est entourée, par complémentarité de forme, par une chaîne de levage (20) munie, à son extrémité, d'un crochet de traction (21), et un arbre (10) entraînant la roue dentée (17), de préférence par l'intermédiaire d'une transmission (15) ;
    une rondelle filetée (22), qui est en liaison vissée, avec son filetage disposé à l'intérieur, avec un filetage externe (23) de l'arbre (10) et qui est munie d'une denture d'entraînement (26) pour l'emboîtement d'un élément de force (11) entraîné manuellement ou par un moteur ;
    un disque de freinage (25) rotatif par rapport à l'arbre (10) et à la rondelle filetée (22), avec une première surface de freinage, qui est orientée contre une surface d'entraînement (10A) fixe en rotation par rapport à l'arbre (10) et une deuxième surface de freinage qui est orientée contre la rondelle rotative (22) et avec des dents de blocage (25A), disposées sur le disque de freinage (25), pour l'emboîtement à blocage unilatéral d'un cliquet (27) logé au niveau du boîtier (1) ;
    un dispositif de roue libre (12), qui est conçu pour agrandir la distance axiale entre la rondelle filetée (22) et la surface d'entraînement (10A),
    caractérisé en ce que, sur la rondelle filetée (22), est disposé au moins un élément centrifuge (31, 32) fixe en rotation par rapport à celle-ci, qui est munie à l'extérieur d'une surface de friction (34) et en ce que l'élément centrifuge (31, 32) peut être élargi vers l'extérieur contre la force d'un ressort (39) jusqu'au contact de la surface de friction (34) avec une surface de freinage (33) réalisée sur le boîtier (1).
  2. Palan à chaîne selon la revendication 1, caractérisé en ce que le dispositif de roue libre (12) est conçu pour agrandir la distance axiale entre la rondelle filetée (22) et la surface d'entraînement (10A) par la rotation de la rondelle filetée (22) sur le filetage externe (23).
  3. Palan à chaîne selon la revendication 1 ou 2, caractérisé en ce que la surface de freinage (33) est cylindrique.
  4. Palan à chaîne selon l'une des revendications 1 à 3, caractérisé par deux éléments centrifuges (31, 32) au total, qui sont disposés de façon à pouvoir être éloignés entre eux vers l'extérieur sur la rondelle filetée (22).
  5. Palan à chaîne selon la revendication 4, caractérisé en ce que le ressort (39) est un ressort annulaire entourant conjointement les deux éléments centrifuges (31, 32).
  6. Palan à chaîne selon la revendication 4 ou 5, caractérisé en ce que les éléments centrifuges (31, 32) sont disposés dans des logements, ouverts radialement vers l'extérieur, de la rondelle filetée (22).
  7. Palan à chaîne selon l'une des revendications 4 à 6, caractérisé en ce que les éléments centrifuges (31, 32) sont appuyés, dans la direction circonférentielle, contre des parois des logements.
EP18165582.0A 2017-04-24 2018-04-04 Palan à chaîne Active EP3395746B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017108694.3A DE102017108694A1 (de) 2017-04-24 2017-04-24 Kettenzug

Publications (2)

Publication Number Publication Date
EP3395746A1 EP3395746A1 (fr) 2018-10-31
EP3395746B1 true EP3395746B1 (fr) 2019-10-09

Family

ID=61899098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18165582.0A Active EP3395746B1 (fr) 2017-04-24 2018-04-04 Palan à chaîne

Country Status (4)

Country Link
US (1) US10351397B2 (fr)
EP (1) EP3395746B1 (fr)
CA (1) CA3002452A1 (fr)
DE (1) DE102017108694A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019120036A1 (de) * 2019-07-24 2021-01-28 Columbus Mckinnon Industrial Products Gmbh Hebezeug
USD982871S1 (en) * 2020-03-20 2023-04-04 Konecranes Global Corporation Hoist
DE102021101058A1 (de) 2021-01-19 2022-07-21 Columbus Mckinnon Industrial Products Gmbh Hebezeug

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1246972B (de) * 1962-08-29 1967-08-10 Hitachi Ltd Motor-Kettenzug
JPS5293063A (en) * 1976-02-02 1977-08-05 Hitachi Ltd Overload-preventing apparatus for winch
JPS6239029Y2 (fr) * 1979-04-03 1987-10-05
JPS597695A (ja) 1982-07-02 1984-01-14 株式会社キト− レバ−式小型巻上兼牽引装置における遊転装置
JPS5939692A (ja) 1982-08-25 1984-03-05 株式会社キト− 電気式巻上兼牽引装置
DE3910369A1 (de) * 1989-03-28 1990-10-04 Mannesmann Ag Sicherheitseinrichtung
TW267151B (fr) * 1993-11-11 1996-01-01 Shoin Chain Block Kk
US5848781A (en) * 1994-01-13 1998-12-15 Ingersoll-Rand Company Balancing hoist braking system
DE10148408C1 (de) * 2001-09-29 2002-11-14 Hoffmann Foerdertechnik Gmbh W Sicherheitsbremse für einen Elektrokettenzug
US9764172B2 (en) * 2009-03-09 2017-09-19 D B Industries, Llc Safety device with fall arrest and descending modes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3395746A1 (fr) 2018-10-31
US20180305189A1 (en) 2018-10-25
US10351397B2 (en) 2019-07-16
DE102017108694A1 (de) 2018-10-25
CA3002452A1 (fr) 2018-10-24

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