EP1043264A2 - Dispositifs d'arrêt - Google Patents

Dispositifs d'arrêt Download PDF

Info

Publication number
EP1043264A2
EP1043264A2 EP20000302518 EP00302518A EP1043264A2 EP 1043264 A2 EP1043264 A2 EP 1043264A2 EP 20000302518 EP20000302518 EP 20000302518 EP 00302518 A EP00302518 A EP 00302518A EP 1043264 A2 EP1043264 A2 EP 1043264A2
Authority
EP
European Patent Office
Prior art keywords
stopper device
chain
clamp
clamp members
component
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.)
Withdrawn
Application number
EP20000302518
Other languages
German (de)
English (en)
Inventor
John Christopher Mee
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.)
GW 103 LIMITED
Original Assignee
Morris Material Handling Ltd
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
Priority claimed from GBGB9907518.6A external-priority patent/GB9907518D0/en
Priority claimed from GB0000486A external-priority patent/GB0000486D0/en
Application filed by Morris Material Handling Ltd filed Critical Morris Material Handling Ltd
Publication of EP1043264A2 publication Critical patent/EP1043264A2/fr
Withdrawn legal-status Critical Current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
    • B66D3/18—Power-operated hoists
    • B66D3/26—Other details, e.g. housings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/22—Rigid members, e.g. L-shaped members, with parts engaging the under surface of the loads; Crane hooks
    • B66C1/34—Crane hooks

Definitions

  • the invention relates to stopper devices and particularly to devices for stopping a component from moving through a piece of apparatus.
  • One embodiment of the invention relates to a device for stopping a chain from running through a piece of apparatus, for example a chain hoist.
  • Chain hoists are well known and comprise a length of chain which is pulled to raise a load.
  • the hoist may for example have an indented wheel with which the chain engages so that as the wheel is rotated, the chain is pulled to raise the load.
  • the invention provides a stopper device for a component, the stopper device comprising a pair of clamp members moveable towards one another to clamp the component therebetween, the clamp members then being connectable together to retain the component in the clamped condition.
  • the stopper device may be for a length of chain, the clamp members being moveable towards one another to clamp a link of the chain therebetween, subsequent connection of the clamp members retaining the link of the chain in the clamp condition.
  • the two clamp members are identical so that only one component has to be manufactured.
  • Each clamp member may comprise a component having a slot therein, such that when the two clamp members are moved towards one another the link of the chain is trapped between the respective ends of the slots.
  • Each clamp member may comprise a circular disc.
  • the clamp members may be connected together by at least one bolt.
  • each clamp member has two bolt holes therethrough, one on each side of the slot.
  • a spring loaded buffer may be provided for use with the stopper device.
  • the buffer may comprise a compression spring which in use is fitted over the chain adjacent to the stopper device.
  • a cap member may be provided around the chain, on the opposite side of the compression spring to the stopper device, and movable towards the stopper device to compress the spring.
  • the invention includes a length of chain fitted with a stopper device as defined above.
  • the invention includes a chain hoist having at least one stopper device as defined above.
  • the component comprises a crane hook.
  • the clamp members may be arrangeable to retain the chain hook in a crane block assembly.
  • the clamp members may be retained together by surrounding them by components of the crane block assembly.
  • the invention includes a crane hook associated with a stopper device according to the invention.
  • the invention includes a crane block assembly incorporating a stopper device according to the invention.
  • the stopper device according to the first embodiment of the invention comprises a pair of plates 10 and 11.
  • the plate 10 is shown in detail and to a larger scale in figures 1 and 2.
  • the plate is simply a circular disc with a slot 12 and two bolt holes 13, one on each side of the slot 12. It will thus be appreciated that the plates can be manufactured very quickly and very cheaply.
  • the plates are lined up on opposite sides of one link 14 of a length of chain 15.
  • the plates are lined up with the respective mouths of the slots 12 facing one another. The plates are then moved together so that the link 15 is trapped between the inner ends of the respective slots.
  • the stopper device is locked in position with respect to the longitudinal axis of the chain 15 by the fact that the upper link 19 and lower link 20 are at 90° to the link 14 and cannot therefore move into the slots 12.
  • the stopper device will normally be positioned at the end of the length of chain 15, as indicated in figure 3, to prevent the chain passing through a piece of apparatus such as a chain hoist, but it will be appreciated that the device can be used to provide a stopper device at any point along the length of a chain.
  • the stopper device might for example be positioned at a point where it is desired to have the chain operate a limit switch.
  • stopper device is very simple, it is also very strong, and is securely located in position by the bolts and by the links 19 and 20.
  • a cap 21 and compression spring 22 may be threaded onto the end of the chain 15.
  • the cap 21 has an aperture therein which has a diameter slightly greater than the thickness of the links, so that the cap is free to move back and forth in the direction of the longitudinal axis of the chain.
  • the spring 22 surrounds the chain and is trapped between the cap 21 and the stopper device.
  • the cap 21 is mushroom shaped, having a stem 23 which fits within the spring 22.
  • the use of the buffer is best illustrated by reference to figure 5, which shows a hoist utilising the invention.
  • the hoist comprises a body 24 which in use is suspended by a hook 25.
  • a load hook 26, through which the chain 15 passes, can be raised or lowered to raise or lower a load.
  • the chain passes over an indented wheel 26 and rotation of the wheel by a motor (not shown) operates the hoist.
  • the hoist is fitted with a limit switch having an actuating arm 28.
  • the load hook 26 moves further and further away from the body 24 and the stopper device moves towards the limit switch arm 28.
  • the cap 21 strikes the arm 28 at 8 metres per minute.
  • the arm 28 is pushed by the cap 21 through a few degrees of movement and this causes the limit switch to operate, removing power from the hoist.
  • a hoist brake (not shown) operates and slows the chain from 8 metres per minute to 0 metres per minutes as the load that the hoist is lowering is decelerated.
  • the buffer comprising the cap 21, stem 23 and spring 22, gives this embodiment of the invention two further enhancements.
  • the spring is so sized that when fully compressed, its length is less than the length of the stem of the mushroom shaped cap. This is demonstrated by the diagram of figure 4.
  • the lower part of the stem 23 has come into contact with the upper stopper plate 10 and the spring cannot therefore be compressed anymore. Thus the spring can never be crushed between the cap 21 and the plate 10.
  • the impacting of the stem 23 on the plate 10 protects the spring from damage. This makes the assembly more robust than known buffers in which excessive travel, caused by failure in their system or brake, crushes the spring, which then has to be replaced.
  • the second enhancement arises from the fact that the components are selected such that in normal operation, the fail-safe situation shown in the diagram of figure 4 will not occur.
  • the operation of the brake, following the actuation of the limit switch, will bring the components to rest before the spring 22 has fully compressed.
  • each disc has a raised portion 30 which has the same width as the slot 12.
  • the crane hook 31 which is to be clamped, has a shank 32 with a reduced diameter waist portion 33.
  • two of the discs 10 are each positioned on a respective side of the waist 33, with the mouths of the slots facing one another, and the discs are then moved towards one another in the direction of the arrows of Figure 9, movement being continued until the waist 33 is trapped between the ends of the slots 12.
  • the raised portion 30 of each disc engages in the mouth of the slot of the opposite disc.
  • the hook together with the discs, is then positioned between two halves of a chain block assembly 34, as shown in Figure 10, and when the two halves are locked together by bolts 35, the hook is securely retained within the block assembly.
  • each disc Because of the way in which the raised portion 30 of each disc is arranged to be engageable in the mouth of the slot of the opposite disc, it is not possible for the disc to be incorrectly assembled. Furthermore, once the discs are fitted together, they act as a single solid washer, which is capable of supporting a full load.
  • Pairs of discs having different sizes may be provided, for use with different sizes of crane hook.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)
EP20000302518 1999-04-01 2000-03-28 Dispositifs d'arrêt Withdrawn EP1043264A2 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9907518 1999-04-01
GBGB9907518.6A GB9907518D0 (en) 1999-04-01 1999-04-01 Stopper devices
GB0000486A GB0000486D0 (en) 2000-01-12 2000-01-12 Stopper devices
GB0000486 2000-01-12

Publications (1)

Publication Number Publication Date
EP1043264A2 true EP1043264A2 (fr) 2000-10-11

Family

ID=26243368

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000302518 Withdrawn EP1043264A2 (fr) 1999-04-01 2000-03-28 Dispositifs d'arrêt

Country Status (1)

Country Link
EP (1) EP1043264A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2444353A1 (fr) * 2010-10-25 2012-04-25 Ernst-günther Kröger Dispositif d'accrochage pour chaînes de levage
CN113716454A (zh) * 2021-09-06 2021-11-30 重庆大学 一种可抑制摆动的行车吊钩

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2444353A1 (fr) * 2010-10-25 2012-04-25 Ernst-günther Kröger Dispositif d'accrochage pour chaînes de levage
CN113716454A (zh) * 2021-09-06 2021-11-30 重庆大学 一种可抑制摆动的行车吊钩
CN113716454B (zh) * 2021-09-06 2023-02-17 重庆大学 一种可抑制摆动的行车吊钩

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