WO2012108772A1 - Overload releasable connector - Google Patents

Overload releasable connector Download PDF

Info

Publication number
WO2012108772A1
WO2012108772A1 PCT/NO2012/000006 NO2012000006W WO2012108772A1 WO 2012108772 A1 WO2012108772 A1 WO 2012108772A1 NO 2012000006 W NO2012000006 W NO 2012000006W WO 2012108772 A1 WO2012108772 A1 WO 2012108772A1
Authority
WO
WIPO (PCT)
Prior art keywords
locking
dog
connector
casing
blocking body
Prior art date
Application number
PCT/NO2012/000006
Other languages
French (fr)
Inventor
Knut Ove Steinhovden
Original Assignee
Knut Ove Steinhovden
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 Knut Ove Steinhovden filed Critical Knut Ove Steinhovden
Priority to EP12744718.3A priority Critical patent/EP2673233B1/en
Publication of WO2012108772A1 publication Critical patent/WO2012108772A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F19/00—Hoisting, lifting, hauling or pushing, not otherwise provided for
    • B66F19/005—Lifting devices for manhole covers
    • 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
    • B66C1/62—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 comprising article-engaging members of a shape complementary to that of the articles to be handled
    • B66C1/66—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 comprising article-engaging members of a shape complementary to that of the articles to be handled for engaging holes, recesses, or abutments on articles specially provided for facilitating handling thereof

Definitions

  • This invention relates to an overload-releasable connector. More particularly, it relates to an overload-releasable connector which fits complementarily into a connector holder, the connector including a locking-dog casing, which is connected to a load attachment, and being formed with at least one locking dog which is radially movable between a pushed- in or swung- in passive position and a pushed-out or swung-out active position, the locking dog fitting complementarily in the connector holder, and the connector being provided with a blocking body which is movable between a blocking position, in which the blocking body prevents the locking dog from being moved out of its locking position, and a free position, in which the locking dog is free to be moved away from its locking position.
  • the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
  • An overload-releasable connector that fits complementarily into a connector holder
  • the connector including a locking-dog casing, which is connected to a load attachment, and including at least one locking dog which is radial ly movable between a pushed- in or swung- in passive position and a pushed-out or swung-out active position, the locking dog fitting complementarily in the connector holder, and the connector being provided with a blocking body which is movable between a blocking position, in which the blocking body prevents the locking dog from being moved out of its locking position, and a free position, in which the locking dog is free to be moved away from its locking position.
  • the connect or is characterized by the load attachment, which is axially movable relative to the locking-dog casing, being locked to the locking-dog casing by means of a shear pin. All the components of the connector may form a unit even after the shear pin has sheared off.
  • the entire connector can be pulled out of the connector holder, even in an overloaded state, so that a new connector, alternatively the same connector with a new shear pin, may immediately be connected to the connector holder.
  • a displacement of the load attachment relative to the locking-dog casing may bring the load attachment to hit the blocking body or a part connected to the blocking body, a further displacement of the load attachment relative to the locking-dog casing bringing the blocking body to be moved into its free position.
  • the locking-dog casing may be of a cylindrical shape with at least one radial locking-dog cut-out for a locking dog, the blocking body being centrical, axially movable in the locking-dog casing. Thereby the blocking body may lock several locking dogs that may be distributed around the centre axis of the locking-dog casing.
  • the locking-dog casing may be provided with a first axial slot, through which a connecting element connecting the blocking body to an actuating body extends.
  • the load attachment is provided with a second axial slot through which the connecting element extends.
  • the load attachment may abut against the connecting element and thereby be connected to the locking-dog casing, the at least one locking dog and to the blocking body.
  • the structure of the connector has the effect of lateral forces acting on the connector affecting the shear pin only to an insignificant degree.
  • a connector in accordance with the invention enables new connection of a connector to the connector holder after an overloading has happened, without any intermediate cleaning or repair work on the connector holder being necessary.
  • Figure 1 shows, in perspective, a connector according to the invention which is connected to a connector holder
  • Figure 2 shows an axial section of the connector
  • Figure 3 shows the same as figure 2, but a blocking body
  • Figure 4 shows the same as figure 2, but after a shear pin has sheared off and the connector has been released;
  • Figure 5 shows the same as figure 4, but after the connector has been pulled out of the connector holder.
  • the reference numeral 1 indicates a connector which is connected to a connector holder 2.
  • the connector 1 is provided with a lifting eye 4 for the connection of a lifting tool, not shown, in the form of a shackle or the like.
  • the connector holder 2 is arranged to be connected to a load, not shown, or to a fixed attachment.
  • a tubular locking-dog casing 6 is provided with a number of radial locking-dog cut-outs 8 at its lower portion, which are distributed around the centre axis 10 of the connector 1.
  • a locking dog 12 is arranged, ro- tatable around a pivot axle 14 between a swung- in position and a swung-out position.
  • the locking-dog casing 6 is formed with two diametrically opposite, axially elongated, through- going first slots 16.
  • a first shear-pin bore 18 extends through the locking-dog casing 6 at the upper end portion of the locking-dog casing 6.
  • a load attachment 20 which is provided with the lifting eye 4 at its top, is tubular at its opposite portion and, axially movable, surrounds the locking-dog casing 6.
  • the load attachment 20 is also formed with two diametrically opposite, axially elongated, through-going second slots 22 corresponding with the first slots 16 in the locking-dog casing 6.
  • a second shear-pin bore 24 extends through the load attachment 20, corresponding with the first shear-pin bore 18 in the locking-dog casing 6.
  • a shear pin 26 is positioned in the shear-pin bores 18, 24.
  • a blocking body 28 is arranged centrically, axially movable in the locking-dog casing 6.
  • a diametric bore 30 extends through the blocking body 28.
  • a connecting element 32 here in the form of a bolt, extends through the bore 30, the first slots 16 and second slots 22 and out to an external, axially movable actuating body 34.
  • the connector 1 fits complementarily in the tubular connector holder 2 which is provided with annular grooves 36 internally for the locking dog 12.
  • the connector holder 2 is provided with an entrance cone 38 to facilitate the leading-in of the connector 1 when it is to be moved into the connector holder 2.
  • the connector 1 includes an axially movable holder ring 40 which is arranged to hold the locking dog 36 in a swung- in position, see figure 5.
  • the holder ring 40 hits the connector holder 2 and is then moved along the load attachment 20 and out of its locking position by further movement of the connector 1 into the connector holder 2.
  • the connector 1 may be released by moving the actuating body 34 in the direction away from the connector holder 2.
  • the shear pin 26 When overloaded, the shear pin 26 will shear off and the locking-dog casing 6 may be moved downwards relative to the load attachment 20, see figure 4. The connecting element 32 will thereby strike against the second slot 22 in the load attachment 20. Thereby, the blocking element 28 is moved upwards relative to the locking-dog casing 6 and out of its locking position behind the locking dog 12, see figure 4.
  • the shear pin 26 is affected only by torsional forces and axial load between the load attachment 20 and the locking-dog casing .
  • the connector 1 When the locking dog 12 pivots into its swung-in position, the connector 1 may be moved out of the connector holder 2 in its entirety with all the components 42 belonging to it, which include the locking-dog casing 6, the locking dog 12, the pivot axle 14, the load attachment 20, the shear pin 26, the blocking element 28, the connecting element 32, the actuating element 34 and the holder ring 40.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)
  • Sink And Installation For Waste Water (AREA)
  • Confectionery (AREA)
  • Seal Device For Vehicle (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)

Abstract

An overload-releasable connector (1) which fits complemen- tarily in a connector holder (2), the connector (1) including a locking-dog casing (6) which is connected to a load attachment (20), and being formed with at least one locking dog (12) which is radially movable between a pushed- in or swung- in passive position and a pushed-out or swung-out active position, the locking dog (12) fitting complementarily in the connector holder (2), and the connector (1) being provided with a blocking body (28) which is movable between a blocking position, in which the blocking body (28) prevents the locking dog (12) from being moved out of its locking position, and a free position, in which the locking dog (12) is free to be moved away from its locking position, and the load attachment (20), which is axially movable relative to the locking-dog casing (6), being locked to the locking-dog casing (6) by means of a shear pin (26).

Description

OVERLOAD RELEASABLE CONNECTOR
This invention relates to an overload-releasable connector. More particularly, it relates to an overload-releasable connector which fits complementarily into a connector holder, the connector including a locking-dog casing, which is connected to a load attachment, and being formed with at least one locking dog which is radially movable between a pushed- in or swung- in passive position and a pushed-out or swung-out active position, the locking dog fitting complementarily in the connector holder, and the connector being provided with a blocking body which is movable between a blocking position, in which the blocking body prevents the locking dog from being moved out of its locking position, and a free position, in which the locking dog is free to be moved away from its locking position.
Many operations include the use of elongated bodies, for example in the form of a chain or a wire, for lifting or as guides. During some of these operations it is important that a connector which is connected to the elongated body will release at the correct load. At the same time, it is vital that all components belonging to the connector, which may be connected to a connector holder, will follow the released connector so that the connector holder will immediately be ready, so that a new connector may be connected to it. An example elucidating the circumstance is so-called "guide wires" that extend through the splash zone at a vessel and that are used to launch an ROV (Remotely Operated Vehicle) , for example. If an unforeseen, great, lateral load occurs on the wires, they may tear. According to the prior art, such wires are often formed with a weak connector part which breaks before the wire does. However, known weak connector parts have the drawback of leaving behind submerged components that will have to be removed before the wire may be reconnected .
The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
The object is achieved in accordance with the invention through the features which are specified in the description below and in the claims that follow.
An overload-releasable connector that fits complementarily into a connector holder is provided, the connector including a locking-dog casing, which is connected to a load attachment, and including at least one locking dog which is radial ly movable between a pushed- in or swung- in passive position and a pushed-out or swung-out active position, the locking dog fitting complementarily in the connector holder, and the connector being provided with a blocking body which is movable between a blocking position, in which the blocking body prevents the locking dog from being moved out of its locking position, and a free position, in which the locking dog is free to be moved away from its locking position. The connect or is characterized by the load attachment, which is axially movable relative to the locking-dog casing, being locked to the locking-dog casing by means of a shear pin. All the components of the connector may form a unit even after the shear pin has sheared off.
Thus, the entire connector can be pulled out of the connector holder, even in an overloaded state, so that a new connector, alternatively the same connector with a new shear pin, may immediately be connected to the connector holder.
A displacement of the load attachment relative to the locking-dog casing may bring the load attachment to hit the blocking body or a part connected to the blocking body, a further displacement of the load attachment relative to the locking-dog casing bringing the blocking body to be moved into its free position.
The locking-dog casing may be of a cylindrical shape with at least one radial locking-dog cut-out for a locking dog, the blocking body being centrical, axially movable in the locking-dog casing. Thereby the blocking body may lock several locking dogs that may be distributed around the centre axis of the locking-dog casing.
The locking-dog casing may be provided with a first axial slot, through which a connecting element connecting the blocking body to an actuating body extends.
The load attachment is provided with a second axial slot through which the connecting element extends.
In an overloaded state, in which the shear pin has sheared off, the load attachment may abut against the connecting element and thereby be connected to the locking-dog casing, the at least one locking dog and to the blocking body. The structure of the connector has the effect of lateral forces acting on the connector affecting the shear pin only to an insignificant degree.
A connector in accordance with the invention enables new connection of a connector to the connector holder after an overloading has happened, without any intermediate cleaning or repair work on the connector holder being necessary.
In what follows, an example of a preferred embodiment is described, which is visualized in the accompanying drawings, in which:
Figure 1 shows, in perspective, a connector according to the invention which is connected to a connector holder;
Figure 2 shows an axial section of the connector and the
connector holder of figure 1 ;
Figure 3 shows the same as figure 2, but a blocking body
having been moved into its free position by means of an actuating body;
Figure 4 shows the same as figure 2, but after a shear pin has sheared off and the connector has been released; and
Figure 5 shows the same as figure 4, but after the connector has been pulled out of the connector holder.
In the drawings, the reference numeral 1 indicates a connector which is connected to a connector holder 2. The connector 1 is provided with a lifting eye 4 for the connection of a lifting tool, not shown, in the form of a shackle or the like. The connector holder 2 is arranged to be connected to a load, not shown, or to a fixed attachment. A tubular locking-dog casing 6 is provided with a number of radial locking-dog cut-outs 8 at its lower portion, which are distributed around the centre axis 10 of the connector 1. In each locking-dog cut-out 8, a locking dog 12 is arranged, ro- tatable around a pivot axle 14 between a swung- in position and a swung-out position.
The terms upper and lower refer to the normal working position of the connector 1.
At its middle portion, the locking-dog casing 6 is formed with two diametrically opposite, axially elongated, through- going first slots 16. A first shear-pin bore 18 extends through the locking-dog casing 6 at the upper end portion of the locking-dog casing 6.
A load attachment 20 which is provided with the lifting eye 4 at its top, is tubular at its opposite portion and, axially movable, surrounds the locking-dog casing 6. The load attachment 20 is also formed with two diametrically opposite, axially elongated, through-going second slots 22 corresponding with the first slots 16 in the locking-dog casing 6.
A second shear-pin bore 24 extends through the load attachment 20, corresponding with the first shear-pin bore 18 in the locking-dog casing 6.
A shear pin 26 is positioned in the shear-pin bores 18, 24.
A blocking body 28 is arranged centrically, axially movable in the locking-dog casing 6. A diametric bore 30 extends through the blocking body 28. A connecting element 32, here in the form of a bolt, extends through the bore 30, the first slots 16 and second slots 22 and out to an external, axially movable actuating body 34. When the actuating body 34 is in its lower position, see figure 2, the blocking body 28 is in its blocking position behind the locking dog 12, whereas the blocking body 28 is in its released position when the actuating body 34 is in its upper position, see figure 3.
The connector 1 fits complementarily in the tubular connector holder 2 which is provided with annular grooves 36 internally for the locking dog 12.
At its top, the connector holder 2 is provided with an entrance cone 38 to facilitate the leading-in of the connector 1 when it is to be moved into the connector holder 2.
The connector 1 includes an axially movable holder ring 40 which is arranged to hold the locking dog 36 in a swung- in position, see figure 5.
When the connector 1 is moved into the connector holder 2, the holder ring 40 hits the connector holder 2 and is then moved along the load attachment 20 and out of its locking position by further movement of the connector 1 into the connector holder 2.
The connector 1 may be released by moving the actuating body 34 in the direction away from the connector holder 2.
When overloaded, the shear pin 26 will shear off and the locking-dog casing 6 may be moved downwards relative to the load attachment 20, see figure 4. The connecting element 32 will thereby strike against the second slot 22 in the load attachment 20. Thereby, the blocking element 28 is moved upwards relative to the locking-dog casing 6 and out of its locking position behind the locking dog 12, see figure 4. The shear pin 26 is affected only by torsional forces and axial load between the load attachment 20 and the locking-dog casing .
When the locking dog 12 pivots into its swung-in position, the connector 1 may be moved out of the connector holder 2 in its entirety with all the components 42 belonging to it, which include the locking-dog casing 6, the locking dog 12, the pivot axle 14, the load attachment 20, the shear pin 26, the blocking element 28, the connecting element 32, the actuating element 34 and the holder ring 40.

Claims

C l a i m s
1. An overload-releasable connector (1) which fits com- plementarily in a connector holder (2), the connector (1) including a locking-dog casing (6) which is connected to a load attachment (20) , and being formed with at least one locking dog (12) which is radially movable between a pushed- in or swung-in passive position and a pushed-out or swung-out active position, the locking dog (12) fitting complementarily in the connector holder (2) , and the connector (1) being provided with a blocking body (28) which is movable between a blocking position, in which the blocking body (28) prevents the locking dog (12) from being moved out of its locking position, and a free position, in which the locking dog (12) is free to be moved away from its locking position, c h a r a c t e r i z e d i n that the load attachment (20) , which is axially movable relative to the locking-dog casing (6), is locked to the locking-dog casing (6) by means of a shear pin (26) .
2. The overload-releasable connector (1) in accordance with claim 1, c h a r a c t e r i z e d i n that all the components (42) of the connector (1) form a unit, even after the shear pin (26) has sheared off.
3. The overload-releasable connector (1) in accordance with claim 1, c h a r a c t e r i z e d i n that a displacement of the load attachment (20) relative to the locking-dog casing (6) makes the load attachment (20) hit the blocking body (28) or a part connected to the blocking body (28) , a further displacement of the load attachment (20) relative to the locking-dog cas- ing (6) having the effect of the blocking body (28) being moved into its free position.
4. The overload-releasable connector (1) in accordance with claim 1, c h a r a c t e r i z e d i n that the locking-dog casing (6) is of a cylindrical shape with at least one radial locking-dog cut-out (8) for a locking dog (12), the blocking body (28) being centrical, axially displaceable in the locking-dog casing (6) .
5. The overload-releasable connector (1) in accordance with claim 1, c h a r a c t e r i z e d i n that the locking-dog casing (6) is provided with a first axial slot (16) through which a connecting element (32), connecting the blocking body (28) to the actuating body (34), extends.
6. The overload-releasable connector (1) in accordance with claim 1, c h a r a c t e r i z e d i n that the load attachment (20) is provided with a second axial slot (22) through which the connecting element (32) extends .
7. The overload-releasable connector (1) in accordance with claim 1, c h a r a c t e r i z e d i n that in the overloaded state, in which the shear pin (26) has sheared off, the load attachment (20) abuts against the connecting element (32) and is thereby connected to the locking-dog casing (6) , the at least one locking dog (12) and to the blocking body (28) .
PCT/NO2012/000006 2011-02-08 2012-01-23 Overload releasable connector WO2012108772A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12744718.3A EP2673233B1 (en) 2011-02-08 2012-01-23 Overload releasable connector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20110220 2011-02-08
NO20110220A NO334870B1 (en) 2011-02-08 2011-02-08 Overload releasable load coupling

Publications (1)

Publication Number Publication Date
WO2012108772A1 true WO2012108772A1 (en) 2012-08-16

Family

ID=46638813

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2012/000006 WO2012108772A1 (en) 2011-02-08 2012-01-23 Overload releasable connector

Country Status (3)

Country Link
EP (1) EP2673233B1 (en)
NO (1) NO334870B1 (en)
WO (1) WO2012108772A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016178583A1 (en) * 2015-05-06 2016-11-10 Steinhovden Knut Breakable coupling between lifting equipment and load

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107215830B (en) * 2017-06-20 2019-06-07 江苏富华交通运输设备股份有限公司 A kind of well cover opening device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4240090A1 (en) * 1992-11-28 1994-06-01 Leistritz Ag Automatic load coupling unit for crane - consists of crane tackle upper part with pivoted hook segments which enter bore of load mounted lower part and swing out to hook behind shoulder of bore
WO2001079107A1 (en) * 2000-04-13 2001-10-25 Knut Ove Steinhovden Releasable locking device for a mechanical coupling
WO2001087761A1 (en) * 2000-05-19 2001-11-22 Knut Ove Steinhovden Buoyancy-releasable mechanical coupling

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4240090A1 (en) * 1992-11-28 1994-06-01 Leistritz Ag Automatic load coupling unit for crane - consists of crane tackle upper part with pivoted hook segments which enter bore of load mounted lower part and swing out to hook behind shoulder of bore
WO2001079107A1 (en) * 2000-04-13 2001-10-25 Knut Ove Steinhovden Releasable locking device for a mechanical coupling
WO2001087761A1 (en) * 2000-05-19 2001-11-22 Knut Ove Steinhovden Buoyancy-releasable mechanical coupling

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2673233A4 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016178583A1 (en) * 2015-05-06 2016-11-10 Steinhovden Knut Breakable coupling between lifting equipment and load
NO341119B1 (en) * 2015-05-06 2017-08-28 Knut Ove Steinhovden Breakable coupling between lifting equipment and load
GB2554615A (en) * 2015-05-06 2018-04-04 Ove Steinhovden Knut Breakable coupling between lifting equipment and load
GB2554615B (en) * 2015-05-06 2020-07-29 Ove Steinhovden Knut Breakable coupling between lifting equipment and load

Also Published As

Publication number Publication date
NO20110220A1 (en) 2012-08-09
EP2673233A4 (en) 2015-05-27
NO334870B1 (en) 2014-06-23
EP2673233B1 (en) 2016-03-23
EP2673233A1 (en) 2013-12-18

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