EP0447384A2 - Control device in vacuum hoist means - Google Patents

Control device in vacuum hoist means Download PDF

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Publication number
EP0447384A2
EP0447384A2 EP91850064A EP91850064A EP0447384A2 EP 0447384 A2 EP0447384 A2 EP 0447384A2 EP 91850064 A EP91850064 A EP 91850064A EP 91850064 A EP91850064 A EP 91850064A EP 0447384 A2 EP0447384 A2 EP 0447384A2
Authority
EP
European Patent Office
Prior art keywords
valve
vacuum
container
goods
control
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Withdrawn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
EP91850064A
Other languages
German (de)
French (fr)
Other versions
EP0447384A3 (en
Inventor
Leif Emblad
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.)
CONVACOR AB
Original Assignee
CONVACOR 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 CONVACOR AB filed Critical CONVACOR AB
Publication of EP0447384A2 publication Critical patent/EP0447384A2/en
Publication of EP0447384A3 publication Critical patent/EP0447384A3/en
Withdrawn legal-status Critical Current

Links

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
    • B66C1/0256—Operating and control devices
    • 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
    • B66C1/0212—Circular shape
    • 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
    • B66C1/0293—Single lifting units; Only one suction cup
    • 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
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/24—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated
    • B66F3/242—Devices, e.g. jacks, adapted for uninterrupted lifting of loads fluid-pressure operated suspended jacks

Definitions

  • the present invention relates to a control device in vacuum hoist means.
  • This may be of the type described in US Patent 4 413 853 granted 8 November, 1983, for instance.
  • hoist means the speed of the lowering movement can be controlled but it is impossible to control the speed of the hoisting movement. This is a considerable drawback.
  • the object of the present invention is to eliminate this drawback and this is achieved by supplying the vacuum-generating means with air from outside with the aid of a valve and a control device.
  • the air supplied can be regulated from a value O up to a predetermined maximum amount.
  • the vacuum-generating means will cease to draw air out of the vacuum-generating means when the maximum amount of air is supplied in parallel with air from the hoist means.
  • a non-return valve provided on the hoist means will close and the hoist means will stop its movement.
  • the air supplied from the outside thus supplies the vacuum-generating means with air in parallel with air from the actual hoist means.
  • the hoist means can be controlled by means of a valve which valve can be caused by a control device to steplessly open very slightly and thereafter open to its fullest extent.
  • the drawings show an anchoring point 6, the container 1 of a vacuum hoist means, and a suction foot 3 arranged at the lower end 2. Said lower end is provided with manual control 4 and a vacuum-generating means is also also connected to the lower end 2.
  • the vacuum-generating means 5 is provided with a non-return valve 10 which closes the connection to the container 1 when no suction prevails.
  • the manual control 4 is connected to a steplessly variable valve which is connected both to an air intake 8 and to an air intake 9 on the vacuum-generating means 5.
  • the control 4 also influences a second valve 11 which can be steplessly varied from a fully closed position to a position in which it is open to a predetermined extent.
  • the vacuum-generating means described functions in the following manner: It is assumed that the valve 11 is closed and that the vacuum-generating member has been activated to withdraw air from the container 1. A suction foot with load or closed valve will then move upwards at a specific speed. If increased speed is desired, the stepless valve 7 is influenced so that air from the intake 8 is supplied to the air intake 9 of the vacuum-generating means. The air coming from the air intake 9 will thus be drawn off by the vacuum-generating means in parallel with air from the container 1. All air supplied to the cacuum- generation means 5 from the air intake 8 will reduce the upward speed until the vacuumgenerating means 5 is only able to pass on air from the intake 8 but not from the container 1.
  • the manual control 4 must be utilized to influence the stepless valve 11, whereupon the suction foot 3 will move downwards at a speed which is dependent on the opening of the valve 11.
  • a vacuum hoist means has thus been created in which both the upward speed and the downward speed can be controlled steplessly with the aid of two valve systems 7 and 11.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Structural Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

) The present invention relates to vacuum hoist means (1-11) of the type described in US Patent 4 413 853 of 8 November, 1983, for instance. In such hoist means (1-11) the speed of the lowering movement can be controlled but not that of the hoisting movement. The invention enables speed-control of the latter movement by supplying the vacuum-generating means (5) with a controllable quantity of air in parallel with air from the container (1) of the vacuum hoist means.

Description

  • The present invention relates to a control device in vacuum hoist means. This may be of the type described in US Patent 4 413 853 granted 8 November, 1983, for instance. In known hoist means the speed of the lowering movement can be controlled but it is impossible to control the speed of the hoisting movement. This is a considerable drawback.
  • The object of the present invention is to eliminate this drawback and this is achieved by supplying the vacuum-generating means with air from outside with the aid of a valve and a control device. The air supplied can be regulated from a value O up to a predetermined maximum amount. Usually the vacuum-generating means will cease to draw air out of the vacuum-generating means when the maximum amount of air is supplied in parallel with air from the hoist means. In the latter case a non-return valve provided on the hoist means will close and the hoist means will stop its movement. The air supplied from the outside thus supplies the vacuum-generating means with air in parallel with air from the actual hoist means.
  • During lowering movements the hoist means can be controlled by means of a valve which valve can be caused by a control device to steplessly open very slightly and thereafter open to its fullest extent.
  • In known hoist means air is withdrawn from the upper end of the container. However, air can also be withdrawn from the lower end of the container. The present invention will be described more fully with reference to the accompany drawings in which
    • Figure 1 shows schematically a hoist means seen from the side and
    • Figure 2 shows the said hoist means seen from below.
  • The drawings show an anchoring point 6, the container 1 of a vacuum hoist means, and a suction foot 3 arranged at the lower end 2. Said lower end is provided with manual control 4 and a vacuum-generating means is also also connected to the lower end 2. The vacuum-generating means 5 is provided with a non-return valve 10 which closes the connection to the container 1 when no suction prevails. The manual control 4 is connected to a steplessly variable valve which is connected both to an air intake 8 and to an air intake 9 on the vacuum-generating means 5. The control 4 also influences a second valve 11 which can be steplessly varied from a fully closed position to a position in which it is open to a predetermined extent.
  • The vacuum-generating means described functions in the following manner: It is assumed that the valve 11 is closed and that the vacuum-generating member has been activated to withdraw air from the container 1. A suction foot with load or closed valve will then move upwards at a specific speed. If increased speed is desired, the stepless valve 7 is influenced so that air from the intake 8 is supplied to the air intake 9 of the vacuum-generating means. The air coming from the air intake 9 will thus be drawn off by the vacuum-generating means in parallel with air from the container 1. All air supplied to the cacuum- generation means 5 from the air intake 8 will reduce the upward speed until the vacuumgenerating means 5 is only able to pass on air from the intake 8 but not from the container 1.
  • If the raised hoist means is now to be lowered, the manual control 4 must be utilized to influence the stepless valve 11, whereupon the suction foot 3 will move downwards at a speed which is dependent on the opening of the valve 11.
  • A vacuum hoist means has thus been created in which both the upward speed and the downward speed can be controlled steplessly with the aid of two valve systems 7 and 11.

Claims (1)

1. Control device in vacuum hoist means ( 1 - 11 ) for goods or other objets, which can be connected to a stationary or movable anchoring point (6) and is provided with a member to grip said goods (3), said member being vertically movable in relation to said anchoring point (6), said means (1-11) . comprising a tubular container (1) closed at both ends, the upper end of which is connectable to said anchoring point (6) and the lower end of which is intended via a suction body (3) connected thereto to cooperate with the goods to be moved, and wherein the wall material between the ends of which container (1) is partially or entirely compressible in axial direction, and wherein a connection is provided on the container, preferably at its upper end, for connection to a vacuum-generating means (5), said means ( 1 - 11 ) being provided with control and valve means (4 and 11) to control the vacuum in the tubular container (1) so that its length in axial direction can be altered, which control and valve means (4 and 11 ) are preferably arranged close to the lower end of the container (1) and so designed that the valve means (11) can be brought by means of said control means (4) into a fully open state either steplessly or in two steps, and which means (1-11) is preferably provided at the lower end of the container (1) with an additional valve to openor close a channel between the lower end of the container (1) and the suction body (3), which valve consists of a spring-loaded sealing body which is displaced by the goods when the suction body (3) approaches the goods, thereby opening the channel so that the goods can be adhered by means of suction,
characterised in that the vacuum-generating means (5) is connected via an operable valve (7) to the surroundings or to a blast air source, which valve (7)is preferably steplessly adjustable so that the hoisting speed of the hoist means ( 1-11 ) is reduced when air is supplied from the last-mentioned valve (7).
EP19910850064 1990-03-14 1991-03-13 Control device in vacuum hoist means Withdrawn EP0447384A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9000901 1990-03-14
SE9000901A SE465773B (en) 1990-03-14 1990-03-14 MANUAL DEVICE FOR VACUUM LIFTING DEVICE

Publications (2)

Publication Number Publication Date
EP0447384A2 true EP0447384A2 (en) 1991-09-18
EP0447384A3 EP0447384A3 (en) 1992-03-04

Family

ID=20378852

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910850064 Withdrawn EP0447384A3 (en) 1990-03-14 1991-03-13 Control device in vacuum hoist means

Country Status (2)

Country Link
EP (1) EP0447384A3 (en)
SE (1) SE465773B (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB376110A (en) * 1931-10-05 1932-07-07 Fritz Neuenschwander Lifting tackle, for cranes with crabs
FR1474799A (en) * 1965-12-30 1967-03-31 Bertin & Cie Load-carrying suction cup device
DE1431936A1 (en) * 1965-11-13 1969-04-24 Hasenclever Ag Maschf Device for lifting and lowering loads
CH526461A (en) * 1971-02-10 1972-08-15 Gis Ag Vacuum lifting device
FR2370660A1 (en) * 1976-11-12 1978-06-09 Thierion Michel Vacuum pad for lifting bottles - has sprung valve with operating lever actuated by presence of bottle
GB2200615A (en) * 1987-01-22 1988-08-10 Portec Inc Suction actuated lifting apparatus

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB376110A (en) * 1931-10-05 1932-07-07 Fritz Neuenschwander Lifting tackle, for cranes with crabs
DE1431936A1 (en) * 1965-11-13 1969-04-24 Hasenclever Ag Maschf Device for lifting and lowering loads
FR1474799A (en) * 1965-12-30 1967-03-31 Bertin & Cie Load-carrying suction cup device
CH526461A (en) * 1971-02-10 1972-08-15 Gis Ag Vacuum lifting device
FR2370660A1 (en) * 1976-11-12 1978-06-09 Thierion Michel Vacuum pad for lifting bottles - has sprung valve with operating lever actuated by presence of bottle
GB2200615A (en) * 1987-01-22 1988-08-10 Portec Inc Suction actuated lifting apparatus

Also Published As

Publication number Publication date
SE9000901D0 (en) 1990-03-14
EP0447384A3 (en) 1992-03-04
SE9000901L (en) 1991-09-15
SE465773B (en) 1991-10-28

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