SE544516C2 - Vacuum lifting device with a locking device and a method for locking a vacuum control head - Google Patents

Vacuum lifting device with a locking device and a method for locking a vacuum control head

Info

Publication number
SE544516C2
SE544516C2 SE1950198A SE1950198A SE544516C2 SE 544516 C2 SE544516 C2 SE 544516C2 SE 1950198 A SE1950198 A SE 1950198A SE 1950198 A SE1950198 A SE 1950198A SE 544516 C2 SE544516 C2 SE 544516C2
Authority
SE
Sweden
Prior art keywords
locking
vacuum
locking member
lifting device
control head
Prior art date
Application number
SE1950198A
Other languages
Swedish (sv)
Other versions
SE1950198A1 (en
Inventor
John Carlsson
Original Assignee
Tawi Ab
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 Tawi Ab filed Critical Tawi Ab
Priority to SE1950198A priority Critical patent/SE544516C2/en
Publication of SE1950198A1 publication Critical patent/SE1950198A1/en
Publication of SE544516C2 publication Critical patent/SE544516C2/en

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Classifications

    • 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
    • B66C1/02—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 suction means
    • B66C1/0218—Safety measures, e.g. sensors, duplicate functions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
    • B25J15/00—Gripping heads and other end effectors
    • B25J15/06—Gripping heads and other end effectors with vacuum or magnetic holding means
    • B25J15/0616—Gripping heads and other end effectors with vacuum or magnetic holding means with vacuum
    • B25J15/0625—Gripping heads and other end effectors with vacuum or magnetic holding means with vacuum provided with a valve
    • B25J15/0633—Air-flow-actuated valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G47/00—Article or material-handling devices associated with conveyors; Methods employing such devices
    • B65G47/74—Feeding, transfer, or discharging devices of particular kinds or types
    • B65G47/90—Devices for picking-up and depositing articles or materials
    • B65G47/91—Devices for picking-up and depositing articles or materials incorporating pneumatic, e.g. suction, grippers
    • B65G47/917—Devices for picking-up and depositing articles or materials incorporating pneumatic, e.g. suction, grippers control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
    • F16B7/10—Telescoping systems
    • F16B7/14—Telescoping systems locking in intermediate non-discrete positions
    • F16B7/1463—Telescoping systems locking in intermediate non-discrete positions with the expansion of an element inside the outer telescoping member due to the axial movement towards a wedge or a conical member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/06—Check valves with guided rigid valve members with guided stems
    • F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
    • F16K15/066—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring with a plurality of valve members

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Robotics (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

A vacuum lifting device is disclosed comprising a vacuum control head and a locking device (1) comprising a locking arrangement (7) preventing the vacuum control head from moving downwards when vacuum is not being supplied. Also disclosed is a method for locking the vacuum control head of the vacuum lifting device to the vacuum lifting device, which method comprises moving the locking arrangement (7) from a locked position to an unlocked position upon activation of a vacuum pump of the vacuum lifting device, and moving the locking arrangement (7) from the unlocked position to the locked position upon deactivation of the vacuum pump of the vacuum lifting device.

Description

Locking device for a vacuum control head of a vacuum lifting device TECHNICAL FIELD The disclosure relates to a locking device for a vacuum control head of a vacuum lifting deviceand a method for providing a locking device for locking a vacuum control head of a vacuum lifting device.
BACKGROUND ART Vacuum lifting devices are well known in the art and are used in many types of businesses toassist an operator in lifting heavy, cumbersome and/or ungainly items. A vacuum lifting devicemay comprise a vacuum source connected to a housing on which a suction arrangement isattached. The suction arrangement normally comprises a vacuum control head, having one ormore suction cups. The vacuum control head can be located at the end of a flexible tube thatcan unfold under atmospheric pressure when a partial vacuum is applied to the tube. The tubetypically hangs vertically from one end and therefore, when the tube folds up in this way, it lifts up the vacuum control head and any item to which the vacuum control head is attached.
Alternatively, the vacuum lifting device may comprise a cylinder to which the vacuum controlhead is attached, for instance via a wire or a tube. A device inside the tube moves depending on the partial vacuum that can be applied to the tube.
However, when shutting ofthe partial vacuum of the vacuum lifting device, the position of thevacuum control head is not controlled. This means that a separate hanger for the vacuumcontrol head may be required or that it is possible for the vacuum control head to movedownwards although this is not wanted, which may cause the vacuum control head to drop, leading to damage to the vacuum control head and possible injury to an operator.There is thus a need for an improvement with regards to the control of vacuum control head.SUMMARY OF THE INVENTION One object of the present invention is to provide an inventive locking device for a vacuumcontrol head of a vacuum lifting device and a method for providing such a locking device, where the previously mentioned problems are at least partly avoided. This object is achieved by the 2features of the characterising portion of claims 1 and 10. Variations of the invention are described in the appended dependent claims.
The disclosure relates to a locking device for a vacuum control head of a vacuum lifting device.The locking device comprises a locking arrangement comprising a hollow first locking memberattached to a plate. A hollow second locking member is arranged to be attached to the vacuumlifting device and comprises a locking mechanism arranged to engage with a vacuum controlhead locking pin. The second locking member is arranged inside the locking arrangement. Thelocking arrangement is arranged to be movable relative the second locking member from alocked position to an unlocked position upon a force resulting from the activation of a vacuumpump of the vacuum lifting device acting on the plate, such that the movement of the lockingarrangement to the unlocked position disengages or unlocks the locking mechanism of the second locking member.
An advantage with a locking device is that it comprises only mechanical parts and is thereby notreliable on electrical or electromechanical parts. This makes the locking device inexpensive andeasy to install and maintain. The locking device can be installed when assembling the vacuumlifting device or a vacuum lifting device can be retrofitted with the locking device. The lockingdevice is also easily adaptable to different vacuum lifting devices as the parts making up the locking device can be adapted in size to fit various designs of vacuum lifting devices.
The locking mechanism ofthe second locking member may comprise at least one spherical bodyarranged in a conical through-hole in the second locking member, where the spherical body hasa diameter larger than a narrow part ofthe through-hole, such that a part of the spherical bodyextending through the through-hole into the second locking member is arranged to engage withthe locking pin of the vacuum control head. This allows for an easy mechanical, yet sturdy locking mechanism that ensures a secure locking ofthe locking pin.
The first locking member may be a cylinder comprising a first inner diameter and a second innerdiameter, and the second locking member is a cylinder having a first outer diameter, where thefirst outer diameter is approximately 0.1 - 0.5 mm smaller than the first inner diameter. Thisallows for an easy installation of the parts of the locking arrangement. Some play may be allowed between the first locking member and the second locking member. 3The second inner diameter may be smaller than a combined length of the first outer diameterand the diameter of the spherical body, such that when the locking arrangement is in theunlocked position, at least a part ofthe spherical body remains inside the conical through-holeof the second locking member. This leads to that the risk of the spherical bodies escaping the through-hole is reduced or removed entirely.
A transition between the first inner diameter and the second inner diameter may be conical.This results in a smoothertransition between the locked and the unlocked positions and reduces or removes the risk of the spherical bodies to get stuck and jam the locking device.
The first locking member may comprise outer threads on at least an end part of the first lockingmember which can engage with inner threads arranged in a centrally placed opening on the plate. This allows for an easy assembly and disassembly of the locking arrangement.
The locking device may further comprise a spring arranged to be mounted between the plateand an attachment of the vacuum lifting device. This ensures that the plate and thereby the locking arrangement returns to its locked position once the vacuum pump is deactivated.
The disclosure also relates to a vacuum lifting device comprising a flexible tube, a top swivelcomprising a check valve, a vacuum control head comprising a vacuum control head locking pinconnected to the flexible tube and a locking device according to the above description, where the check valve is arranged to be the plate ofthe first locking arrangement.
The disclosure also relates to a vacuum lifting device comprising a cylindrical tube arranged tobe connected to a vacuum pump and a vacuum control head comprising a vacuum control headlocking pin arranged to move inside the cylindrical tube, wherein a locking device according toabove description is arranged inside the cylindrical tube. A locking device according to the disclosure is adaptable for various types of vacuum lifting devices.
The disclosure also relates to a method for locking a vacuum control head of a vacuum liftingdevice to the vacuum lifting device, wherein the vacuum lifting device is provided with a lockingdevice comprising a locking arrangement comprising a first locking member attached to a plateand a second locking member comprising a locking mechanism arranged to engage with avacuum control head locking pin, wherein the second locking member is adapted to move inside the locking arrangement, wherein the method comprises: 4 - moving the locking arrangement from a locked position to an unlocked position upon a forceacting on the plate resulting from the activation of a vacuum pump of the vacuum lifting device,such that the movement of the locking arrangement to the unlocked position disengages orunlocks the locking mechanism of the second locking member, - moving the locking arrangement from the unlocked position to the locked position upondeactivation of the vacuum pump of the vacuum lifting device, such that the movement of thelocking arrangement to locked position engages or locks the locking mechanism of the second locking member.
When the locking device further comprises: - at least one conica| through-hole in the second locking member in which a spherical bodyhaving a diameter larger than the sma||est extension ofthe conica| through-hole in the conica|through-hole is arranged, the method may further comprise: - pressing, in the locked position, by the first locking member on the spherical bodies, such thatthe distance between the spherical bodies inside the second locking member is smaller than thediameter ofthe second locking pin part, - pressing, in the unlocked position, by the first locking member on the spherical bodies suchthat the spherical bodies are allowed to move outwards from their respective conica| through-holes, increasing the distance between them such that the distance is larger than the diameter of the second locking pin part and the locking pin can be released from the locking device.
When the locking device further comprises: - a spring arranged to be mounted between the plate and an attachment of the vacuum liftingdevice, the method may further comprise: - moving the locking arra ngement from the unlocked position to the locked position by means of the spring.
The disclosure also relates to a method for providing a locking device for locking a vacuumcontrol head of a vacuum lifting device, wherein the method comprises: - providing a locking arrangement comprising a first locking member attached to a plate, - providing a second locking member arranged to be attached to the vacuum lifting device andcomprising a locking mechanism arranged to engage with a vacuum control head locking pin, wherein the second locking member is arranged inside the locking arrangement, - moving the locking arrangement from a locked position to an unlocked position upon a forceacting on the plate resulting from the activation of a vacuum pump of the vacuum lifting device,such that the movement of the locking arrangement to the unlocked position disengages orunlocks the locking mechanism of the second locking member, - moving the locking arrangement from the unlocked position to the locked position upondeactivation of the vacuum pump of the vacuum lifting device, such that the movement of thelocking arrangement to locked position engages or locks the locking mechanism of the second locking member.
The method may further comprise:- providing at least one conica| through-hole in the second locking member,- providing a spherical body having a diameter larger than the sma||est extension ofthe conica| through-hole in the conica| through-hole.
The method may further comprise: - providing a cylinder as the first locking member, comprising a first inner diameter and a secondinner diameter, - providing a cylinder as the second locking member, having a first outer diameter, where the first outer diameter is approximately 0.1 - 0.5 mm smaller than the first inner diameter.
The method may further comprise:- providing the first locking member with a second inner diameter being smaller than a combined length of the first outer diameter and the diameter of the spherical body.
The method may further comprise:- providing the first locking member with a conica| transition between the first inner diameter and the second inner diameter.
The method may further comprise: - providing the first locking member with outer threads on at least an end part ofthe first lockingmember, - providing the plate with inner threads in a centrally placed opening of the plate, which are arranged to engage with the outer threads of the first locking member.
The method may further comprise:- providing a spring arranged to be mounted between the plate and an attachment of the vacuum lifting device.The method providesBRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 schematically shows a locking device according to a first example embodiment in a locked state,Fig. 2 schematically shows a close up of the locking mechanism in figure 1, Fig. 3 schematically shows a locking device according to a first example embodiment in an unlocked state, Fig. 4 schematically shows a locking device according to second example embodiment in an unlocked position.DETAILED DESCRIPTION Fig. 1 schematically shows a locking device 1 according to a first example embodiment in alocked state. In the first example embodiment, a vacuum lifting device (not shown) comprisesan essentially horizontal cylindrical tube 2 arranged to be connected to a vacuum pump (notshown) and a vacuum control head (not shown). The vacuum control head is further connectedto a vacuum control head locking pin 3. In this example, the vacuum control head locking pin 3is connected to a piston 4 or similar arranged to move inside the cylindrical tube 2 which in turnis connected to the vacuum control head by connection 4a. The vacuum control head lockingpin 3 does not have to be directly connected to the vacuum control head, but can like in thisexample be connected to an intermediary device, e.g. a piston, which in turn is connected tothe vacuum control head. The locking device 1 is arranged inside the cylindrical tube 2. An airconnection 5 connects the cylindrical tube 2 to the vacuum pump. The air connection 5 and the cylindrical tube 2 are arranged in a housing 6.
The locking device 1 comprises a locking arrangement 7 comprising a hollow first lockingmember 8 attached to a plate 9. A hollow second locking member 10 is arranged to be attached to the vacuum lifting device by a fastening device 11, for instance by means of a screw 12 7arranged to engage with a threaded rear end 13 of the second locking member 10, where thescrew 12 extends through a wall 14 of the housing 6 of the vacuum lifting device. The fastening device 11 may also be a bolt or a welded connection to the wall 14. ln this example embodiment, the first locking member 8 and second locking member 10 arecylinders. lt is also conceivable that the first locking member 8 and second locking member 10are hollow cuboids, or comprise another hollow body with for instance an oval cross section or a polygonal cross section.
The plate 9 has a hole (not shown) arranged in the centre of the plate 9 which is arranged toreceive an end part 15 of the first locking member 8. The first locking member 8 may havethreads on the outside of the end part 15 which can engage with threads arranged on the insideof the hole in the plate 9. The first locking member 8 can be attached to the plate 9 also by forinstance welding or gluing. A flange 16 on the first locking member 8 ensures that the firstlocking member 8 is essentially flush with a rear side 17 of the plate 9. ln the closed state, theplate 9 closes the air connection 5 between the vacuum pump and the cylindrical tube 2 bymeans of a spring 18 placed between the plate 9 and the wall 14 of the housing 6, where the spring is biased to push the plate 9 towards a closed position as shown in figure 1.
A bushing 19, or another kind of suitable bearing, is arranged between the first locking member8 and the second locking member 10 in order to enable movement in a forward and a rearwarddirection ofthe first locking member 8 relative the second locking member 10. ln case of a non-circular cross section of the first locking member 8 and second locking member 10, the bushing 19 is adapted accordingly.
The locking arrangement 7 is arranged to be movable relative the second locking member 10from a locked position to an unlocked position upon a pressure resulting from the activation ofa vacuum pump of the vacuum lifting device acting on the plate 9, such that the movement ofthe locking arrangement 7 to the unlocked position disengages or unlocks a locking mechanism20 of the second locking member 10. When the vacuum pump is deactivated, the lockingarrangement 7 returns to its locked position due to that there is no vacuum or lower pressureon the rear side 17 ofthe plate 9. ln figure 1, the locking mechanism 20 is in a locked state, with the locking arrangement 7 in its locked position. 8The second locking member 10 is arranged inside the locking arrangement 7 and comprises alocking mechanism 20 arranged to engage with the vacuum control head locking pin 3. Thelocking mechanism 20 of the second locking member 10 comprises in this example two sphericalbodies 21a, 21b arranged in conical through-holes 22a, 22b in the second locking member 10arranged on diametrically opposite sides ofthe second locking member 10. The conical through-holes 22a, 22b are arranged such that a wider part of the conical through-holes 22a, 22b isarranged on the outer side of the second locking member 10 and a narrow part of the conicalthrough-hole 22a, 22b is arranged on the inner side of the second locking member 10 facing the interior ofthe second locking member 10.
The spherical bodies 21a, 21b has a diameter larger than the diameter ofthe narrow part of theconical through-holes 22a, 22b, and smaller than the diameter of the wider part of the conicalthrough-hole 22a, 22b. ln this way, the spherical bodies 21a, 21b can move in and out of theconical through-holes 22a, 22b from the outside, and such that only a part of the spherical bodyextends through the narrow part of the conical through-hole 22a, 22b into the interior of thesecond locking member 10 and therein can engage with the locking pin 3 ofthe vacuum controlhead. The locking mechanism 20 can also comprise cones or conical frustums, with either a flatouter end or a curved outer end, where at least an inner part ofthe locking mechanism extendsinto the interior of the second locking member 10 and therein can engage with the locking pin 3 ofthe vacuum control head.
The vacuum control head locking pin 3 comprises a first locking pin part 23 and a second lockingpin part 24, wherein the second locking pin part 24 is wider than the first locking pin part 23 andhas a shape and size that matches the internal shape and size of the second locking member 10.ln this example, the vacuum control head locking pin 3 is cylindrical in shape with the firstlocking pin part 23 having a diameter smaller than the second locking pin part 24. When thelocking arrangement 7 is in the locked position, the locking pin 3 is arranged inside the secondlocking member 10 and the spherical bodies 21a, 21b ofthe locking mechanism 20 are arrangedforward ofthe second locking pin part 24. Forward means towards a front ofthe cylindrical tube2, the second locking member 8 of the locking device 1 is attached at the rear end 13 of the cylindrical tube 2. 9Fig. 2 schematically shows a close up of the locking mechanism 20 of fig. 1. The first lockingmember 8 comprises a first inner diameter D1 and a second inner diameter D2. The secondlocking member 10 comprises a first outer diameter D3. The size ofthe bushing 19 is adaptedto provide a good fit between the first locking member 8 and the second locking member 10.Alternatively or complementary, the first outer diameter D3 may be approximately 0.1 - 0.5mm smaller than the first inner diameter D1, thus some play may be allowed between the first locking member 8 and the second locking member 10. ln the locked position, the size ofthe first inner diameter D1 is such that the first locking member8 presses on the spherical bodies 21a, 21b such that a distance L between the spherical bodiesis smaller than a diameter D4 of the second locking pin part 24. ln this way, the locking pin 3 and thereby the vacuum control head is locked in position.
Fig. 3 schematically shows a locking device 1 according to a first example embodiment in anunlocked state. The unlocked state is achieved when the vacuum pump of the vacuum liftingdevice is activated. This causes the pressure in the air connection 5 to drop, creating a vacuumor low pressure on the rear side 17 of the plate 9. This causes the atmospheric pressure in thecylindrical tube 2 to press on the plate 9 until the plate 9, and thereby the locking arrangement7 reaches its unlocked position. ln this position, air is allowed to flow through the cylindricaltube 2 through the air connection 5 to the vacuum pump in order to create the desired vacuumof the vacuum control head. The piston 4 is designed such that it allows air to flow past it or through it. ln the unlocked position, the first locking member 8 has moved backwards together with theplate 9 such that the second inner diameter D2, being larger than the first inner diameter D1 isin contact with the spherical bodies 21a, 21b. The second inner diameter D2 allows the sphericalbodies 21a, 21b to move outwards from their respective conical through-holes 22a, 22b,thereby increasing the distance L between them such that the distance L is larger than thediameter D4 of the second locking pin part 24 and the locking pin 3 and thereby the vacuumcontrol head can be released from the locking device 1. The first locking member 8 may have aconical transition 25 between the first inner diameter D1 and the second inner diameter D2,allowing for a smoother opening and closing ofthe locking mechanism 20 as the spherical bodies 21a, 21b are not at risk of getting stuck against a sharp edge between the first inner diameter D1 and the second inner diameter D2 ofthe first locking member 8. lfthe first locking member 8 and the second locking member 10 are not cylindrical, the transition 25 is adapted accordingly.
The second inner diameter D2 of the first locking member 8 is in this example smaller than acombined length of the first outer diameter D3 and the diameter of the spherical bodies 21a,21b, such that when the locking arrangement 7 is in the unlocked position, at least a part of thespherical body 21a, 21b remains inside the conical through-hole 22a, 22b of the second lockingmember 10. ln this way the spherical bodies cannot fall out of the locking device. A forwardmostdiameter, even bigger than the second diameter D2, is such that the spherical bodies 21a, 21bcan be inserted into or removed from the locking device 1 upon assembly/disassembly of the locking device 1.
Fig. 4 schematically shows a locking device 1 according to second example embodiment in anunlocked position. ln the second example embodiment, the vacuum lifting device comprises aflexible tube (not shown) attached to a top swivel 26 and to a vacuum control head (not shown).ln this example embodiment, the top swivel 26 comprises a check valve 27 that closes the airconnection 5 to the vacuum pump when the vacuum pump is not active. The lockingarrangement 7 in this example comprises the check valve 27 into which a hole (not shown) hasbeen made that allows for attachment of the first locking member 8 to the check valve 27. The check valve 27 in this case functions as the plate 9 in the first example embodiment.
The second locking member 10 is according to one example attached to a bracket 28 inside thetop swivel 26 and thereby to the vacuum lifting device. The second locking member 10 can beattached to the top swivel 26 in different ways than the one described. The remaining details of the top swivel 26 are known in the art and will not be described further. ln figure 4, when the locking device is in an unlocked state, the vacuum pump is active and theatmospheric pressure acting on the check valve 27 causes the check valve 27 and thereby thelocking arrangement 7 to rise allowing air to flow through the air connection 5 to the vacuumpump, thereby creating the desired vacuum at the vacuum control head. When the vacuumpump is deactivated, the locking arrangement 7 is returned to its locked position by means ofgravity. A spring (not shown in this example) similar to the first example embodiment can assist with the return of the locking arrangement 7 to its closed position. 11ln this example, the locking pin 3 is directly attached to the vacuum control head. The remainingdetails of the locking device 1 not described in conjunction to the second example embodiment function in the same way as described in conjunction with the first example embodiment.
Reference signs mentioned in the claims should not be seen as limiting the extent ofthe matter protected by the claims, and their sole function is to make claims easier to understand.
As will be realised, the invention is capable of modification in various obvious respects, allwithout departing from the scope of the appended claims. Accordingly, the drawings and the description thereto are to be regarded as illustrative in nature, and not restrictive.

Claims (8)

1. A vacuum lifting device, comprising a flexible tube, a top swivel (26) comprising acheck valve (27), a vacuum control head comprising a control head locking pin (3), the lockingpin comprising a first locking pin part (23) and a second locking pin part (24), wherein the secondlocking pin part (24) is wider than the first locking pin part (23), the flexible tube being attachedto the top swivel (26) and to the vacuum control head, and a locking device (1) comprising: - a locking arrangement (7) comprising a hollow first locking member (8) attached to a plate (9),- a hollow second locking member (10) arranged to be attached to the vacuum lifting device andcomprising a locking mechanism (20) arranged to engage with the vacuum control head lockingpin (3) directly attached to the vacuum control head, wherein the second locking member (10)is arranged inside the locking arrangement (7), wherein the locking mechanism (20) of thesecond locking member (10) comprises at least two spherical bodies (21a, 21b) arranged in atleast two conical through-holes (22a, 22b) in the second locking member (10), where thespherical bodies (21a, 21b) have a diameter larger than a narrow part ofthe through-holes (22a,22b), such that a part of the spherical bodies (21a, 21b) extending through the respectivethrough-holes (22a, 22b) into the second locking member (10) is arranged to engage with thelocking pin (3) of the vacuum control head, such that in the locked position, the size of a firstinner diameter (D1) of the first locking member (8) is such that the first locking member (8)presses on the spherical bodies (21a, 21b) such that a distance (L) between the spherical bodies(21a, 21b) is smaller than a diameter (D4) of the second locking pin part (24), - the locking arrangement (7) is arranged to be movable relative the second locking member(10) from a locked position to an unlocked position upon a force resulting from the activationof a vacuum pump ofthe vacuum lifting device acting on the plate (9), such that the movementof the locking arrangement (7) to the unlocked position disengages or unlocks the lockingmechanism (20) of the second locking member (10), where the check valve (27) is arranged tobe the plate (9) of the first locking member (8), wherein the locking arrangement (7) is arranged to be returned to its locked position by means of gravity upon deactivation ofthe vacuum pump.
2. A vacuum lifting device, comprising a cylindrical tube (2) arranged to be connectedto a vacuum pump and a vacuum control head, the vacuum control head comprising a vacuumcontrol head locking pin (3) arranged to move inside the cylindrical tube (2), the vacuum controlhead locking pin (3) comprising a first locking pin part (23) and a second locking pin part (24),wherein the second locking pin part (24) is wider than the first locking pin part (23), an airconnection (5) connecting the cylindrical tube to a vacuum pump, the air connection (5) and thecylindrical tube (2) being arranged in a housing (6), and a locking device (1) comprising: - a locking arrangement (7) comprising a hollow first locking member (8) attached to a plate (9),where a spring (18) is placed between the plate (9) and a wall (14) ofthe housing (6), where thespring (18) is biased to push the plate (9) towards a closed position when athe vacuum pump isdeactivated, - a hollow second locking member (10) arranged to be attached to the vacuum lifting device andcomprising a locking mechanism (20) arranged to engage with the vacuum control head lockingpin (3), wherein the second locking member (10) is arranged inside the locking arrangement (7),wherein the locking mechanism (20) of the second locking member (10) comprises at least twospherical bodies (21a, 21b) arranged in at least two conical through-holes (22a, 22b) in thesecond locking member (10), where the spherical bodies (21a, 21b) have a diameter larger thana narrow part ofthe through-holes (22a, 22b), such that a part ofthe spherical bodies (21a, 21b)extending through the respective through-holes (22a, 22b) into the second locking (10) memberis arranged to engage with the locking pin (3) ofthe vacuum control head, such that in the lockedposition, the size of a first inner diameter (D1) of the first locking member (8) is such that thefirst locking member (8) presses on the spherical bodies (21a, 21b) such that a distance (L)between the spherical bodies (21a, 21b) is smaller than a diameter (D4) of the second lockingpin part (24), - the locking arrangement (7) is arranged to be movable relative the second locking member(10) from a locked position to an unlocked position upon a force resulting from the activationof the vacuum pump of the vacuum lifting device acting on the plate (9), such that themovement of the locking arrangement (7) to the unlocked position disengages or unlocks thelocking mechanism (20) of the second locking member (10), wherein the locking device (1) is arranged inside the cylindrical tube (2).
3. 3. The vacuum lifting device according to claim 1 or 2, wherein the first lockingmember (8) is a cylinder comprising a first inner diameter (D1) and a second inner diameter(D2), and the second locking member (10) is a cylinder having a first outer diameter, where the first outer diameter is approximately 0.1 - 0.5 mm smaller than the first inner diameter (D1).
4. The vacuum lifting device according to claim 3, wherein the second inner diameter(D2) is smaller than a combined length of the first outer diameter and the diameter of thespherical bodies (21a, 21b), such that when the locking arrangement (7) is in the unlockedposition, at least a part ofthe spherical bodies (21a, 21b) remains inside the respective conical through-holes (22a, 22b) of the second locking member (10).
5. The vacuum lifting device according to claim 3 or 4, wherein a transition between the first inner diameter (D1) and the second inner diameter (D2) is conical.
6. The vacuum lifting device according to any one of claims 1-5, wherein the firstlocking member (8) comprises outer threads on at least an end part ofthe first locking member (8) which can engage with inner threads arranged in a centrally placed opening on the plate (9).
7. The vacuum lifting device according to claim 1, wherein the locking device (1)further comprises a spring arranged to be mounted between the plate (9) and an attachment of the vacuum lifting device.
8. A method for locking a vacuum control head of a vacuum lifting device to thevacuum lifting device according to any one of the preceding claims, wherein the methodcomprises: - moving the locking arrangement (7) from a locked position to an unlocked position upon a force acting on the plate (9) resulting from the activation of the vacuum pump of the vacuum 4lifting device, such that the movement of the locking arrangement (7) to the unlocked positiondisengages or unlocks the locking mechanism (20) of the second locking member (10),- moving the locking arrangement (7) from the unlocked position to the locked position upondeactivation of the vacuum pump of the vacuum lifting device, such that the movement of thelocking arrangement (7) to locked position engages or locks the locking mechanism (20) of the second locking member (10).
SE1950198A 2019-02-18 2019-02-18 Vacuum lifting device with a locking device and a method for locking a vacuum control head SE544516C2 (en)

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SE544516C2 true SE544516C2 (en) 2022-06-28

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413853A (en) * 1980-02-04 1983-11-08 Sten Andersson Lifting means for goods
US20160075537A1 (en) * 2013-05-22 2016-03-17 Vaculex Ab Vacuum tube lifting device and lifting hose and method for control of a vacuum tube lifting device
US20160076563A1 (en) * 2014-09-11 2016-03-17 Korea Pneumatic System Co., Ltd. Device for locking rod member using lock block
SE1630045A1 (en) * 2016-03-02 2017-09-03 Vaculex Ab VACUUM ULTIMATES WITH DEVICE FOR AVOIDING DISPOSALS OF LOADED LOAD AND METHOD FOR CONTROLING THEM

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4413853A (en) * 1980-02-04 1983-11-08 Sten Andersson Lifting means for goods
US20160075537A1 (en) * 2013-05-22 2016-03-17 Vaculex Ab Vacuum tube lifting device and lifting hose and method for control of a vacuum tube lifting device
US20160076563A1 (en) * 2014-09-11 2016-03-17 Korea Pneumatic System Co., Ltd. Device for locking rod member using lock block
SE1630045A1 (en) * 2016-03-02 2017-09-03 Vaculex Ab VACUUM ULTIMATES WITH DEVICE FOR AVOIDING DISPOSALS OF LOADED LOAD AND METHOD FOR CONTROLING THEM

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