EP0798261B1 - Dispositif de sécurité pour chariots élévateur - Google Patents

Dispositif de sécurité pour chariots élévateur Download PDF

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Publication number
EP0798261B1
EP0798261B1 EP97850048A EP97850048A EP0798261B1 EP 0798261 B1 EP0798261 B1 EP 0798261B1 EP 97850048 A EP97850048 A EP 97850048A EP 97850048 A EP97850048 A EP 97850048A EP 0798261 B1 EP0798261 B1 EP 0798261B1
Authority
EP
European Patent Office
Prior art keywords
lifting
measurement
lift
takes place
velocity
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.)
Expired - Lifetime
Application number
EP97850048A
Other languages
German (de)
English (en)
Other versions
EP0798261A3 (fr
EP0798261A2 (fr
Inventor
Lars Eriksson
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.)
BT Industries AB
Original Assignee
BT Industries 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 BT Industries AB filed Critical BT Industries AB
Publication of EP0798261A2 publication Critical patent/EP0798261A2/fr
Publication of EP0798261A3 publication Critical patent/EP0798261A3/fr
Application granted granted Critical
Publication of EP0798261B1 publication Critical patent/EP0798261B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B66F17/00—Safety devices, e.g. for limiting or indicating lifting force
    • B66F17/003—Safety devices, e.g. for limiting or indicating lifting force for fork-lift trucks

Definitions

  • the current is not a direct measurement of the weight that is lifted but also depend on the acceleration of the lifting movement it is in accordance with the invention in order to increase security suggested that the measuring takes place at a constant lifting velocity.
  • a mean value of the current is taken during a certain time or this is integrated during a fixed time interval. Obtained values are then multiplied with a conversion factor so that the weight in for instance kg is obtained and fed to a suitable representation device that may be digital or analogous. Possibly the calibration weight indication may automatically control the indication in kilograms, lbs e t c. The weight may of course also be presented in a percentage of allowed maximum load.
  • the measuring device is preferably set to zero or calibrated by measuring taking place during a lift without load. Since furthermore the inertia or rolling friction of the fork carriage etc may vary from truck to truck calibration may as an alternative be done by lifting of a calibration weight.
  • the calibration weight may be of the same size as the weights prefered to have the most correct measured value or have a slightly higher weight.
  • the 0-position may be altered during use, that is in principal the current necessary for an empty lift. If desired a corresponding adjustment of the measured value can be carried out successfully since checking and comparing can be carried out by means of a small computer or microprocessor every time that an empty lift is executed.
  • the weight of the load is measured during a free lift, that is the movement when the fork carriage moves in an associated extendable mast that is in its lowest position. During this movement the lifted weight associated with the truck is the lowest in relation to the load and therefor the best precision at the measuring of weight is obtained. Since it may however also be important at the lowering of a load that is situated very high up already at the lifting of this from its storing place to know its weight at least a rough weight indication may be very important. In order to achieve this compensation can be made for the weight of the lifted mast, that is the current that the engine of the hydraulic pump requires for lifting higher than the free lift without load.
  • the differentiation of the measuring device between a free lift or a higher lift may easily be achieved by means of a switch or other sensor placed in the vicinity of the lower end of the mast, which switch is influenced as soon the mast is in its lowest position. When the mast is in its lowest position it is a free lift and otherwise it is a lift in which the entire mast take part.
  • a switch may be used that react at the passing of the upper end of the free lift and that at each passage switch measuring mode. If lift height indication is present this can be used to deliver this information.
  • the constant speed at measuring can for instance be achieved by controlling the voltage the during the measurement, which voltage is to be essentially constant in order to indicate constant velocity, alternatively a compensation can take place for the acceleration.
  • the constant speed at measuring is preferably chosen considerably lower than maximum speed for lifting so that the influence of hydraulic flow losses is reduced.
  • the measurement in any case if a good accuracy is desired, is carried out at the same speed from measurement to measurement.
  • To the weight indication may be coupled a warning signal that is activated if too big loads are on their way to be handled.
  • the presentation may also indicate to which height a particular load may be lifted. Directly when the driver lifts a load from the ground or from a lorry he thus knows which is his highest permitted storage level in the ware house.
  • the indication may be given directly in permitted storage levels and one can consider a programming that is also adapted to other trucks working in the ware house so that no loads get out of reach for certain trucks.
  • the truck is also equipped with an additional indication or warning that indicates or warns if the maximum load is exceeded.
  • the position indication may for instance be obtained in the way that is described in a simultaneously filed Swedish patent application.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Structural Engineering (AREA)
  • Forklifts And Lifting Vehicles (AREA)
  • Component Parts Of Construction Machinery (AREA)

Claims (10)

  1. Procédé pour indiquer le poids d'une charge soulevée pendant une opération d'un chariot élévateur, où le courant adressé au moteur délivrant la puissance pour l'élévation est mesuré et utilisé comme une mesure de charge soulevée, caractérisé en ce que la mesure se produit à une vitesse constante d'élévation.
  2. Procédé selon la revendication 1, caractérisé en ce que la mesure se produit seulement dans la zone d'élévation libre qui est le mouvement, lorsque le tablier porte-fourche se déplace sur un montant extensible qui lui est associé dans sa position la plus basse.
  3. Procédé selon la revendication 1 ou 2, caractérisé par la détection de l'élévation libre qui est le mouvement, lorsque le tablier porte-fourche se déplace sur un montant extensible qui lui est associé dans sa position la plus basse ou non, et en ce que les différentes valeurs de courant sont retranchées de la valeur mesurée dont elle dépend si la mesure se produit dans la zone d'élévation libre ou au-dessus de celle-ci.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la vitesse d'élevage est choisie lente pendant la mesure.
  5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la marne vitesse est choisie de mesure en mesure.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé par un contrôle de la tension pendant la mesure qui doit être essentiellement constante pour indiquer une vitesse constante.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé par une compensation de l'accélération.
  8. Chariot élévateur comprenant un dispositif pour l'exécution du procédé tel que défini dans la revendication 1, comprenant un capteur de courant placé sur la ligne d'alimentation du moteur électrique qui entraíne la pompe hydraulique du chariot et comprenant une unité de calculs comparant le courant obtenu avec une valeur de courant enregistrée à l'avance à une élévation d'un poids étalonné et/ou, une élévation à vide, caractérisé en ce qu'il comprend de plus un dispositif de présentation et des moyens de surveillance, et en ce que, durant la mesure, la vitesse du mouvement est constante.
  9. Chariot élévateur selon la revendication 8, caractérisé en ce que les moyens de surveillance de la vitesse sont des moyens de surveillance du nombre de tours par minute du moteur de la pompe.
  10. Chariot élévateur selon la revendication 8 ou 9, caractérisé en ce qu'il comprend de plus un capteur qui enregistre lorsque le montant est dans sa position la plus basse, zone d'élévation libre, et, en conséquence, l'élévation se produit seulement avec le tablier porte-fourche, et en ce qu'il comprend une mémoire additionnelle pour la valeur de courant qui est obtenue lors d'une élévation à vide au-dessus de la zone d'élévation libre, de manière à ce qu'elle en dépende, si l'élévation se produit dans la zone d'élévation libre ou au-dessus, celle-ci puisse retrancher en correspondance, lors d'une élévation à vide, les courants obtenus des valeurs correspondantes mesurées.
EP97850048A 1996-03-28 1997-03-26 Dispositif de sécurité pour chariots élévateur Expired - Lifetime EP0798261B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9601185 1996-03-28
SE9601185A SE9601185L (sv) 1996-03-28 1996-03-28 Förfarande och anordning för att vid lyfttruckar indikera vikten av den lyfta lasten

Publications (3)

Publication Number Publication Date
EP0798261A2 EP0798261A2 (fr) 1997-10-01
EP0798261A3 EP0798261A3 (fr) 1998-12-23
EP0798261B1 true EP0798261B1 (fr) 2003-02-26

Family

ID=20401979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97850048A Expired - Lifetime EP0798261B1 (fr) 1996-03-28 1997-03-26 Dispositif de sécurité pour chariots élévateur

Country Status (3)

Country Link
EP (1) EP0798261B1 (fr)
DE (1) DE69719232T2 (fr)
SE (1) SE9601185L (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602005019047D1 (de) 2005-09-20 2010-03-11 Atlet Ab Verbessertes Kontrollsystem für ein Flurförderfahrzeug

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2758830A (en) * 1945-11-19 1956-08-14 Bentley Desmond Mulock Weighing the output of lifting and lowering machines
US4053742A (en) * 1976-12-20 1977-10-11 Youngstown Sheet And Tube Company Energy measuring systems adapted for use in conjunction with load moving and weight indicating devices
DE3607135A1 (de) * 1986-03-05 1987-09-10 Feldmuehle Ag Verfahren zum signalisieren der be- und ueberlastung
DE4207072C2 (de) * 1992-03-06 1994-03-10 Heidelberger Druckmasch Ag Vorrichtung zur Bestimmung des Gewichtes eines bewegbaren Gegenstandes
US5393939A (en) * 1992-11-20 1995-02-28 Westinghouse Electric Corp. Apparatus and method for weighing moving objects
DE19511591C2 (de) * 1995-03-29 1997-02-06 Jungheinrich Ag Verfahren zur Bestimmung der Last eines Flurförderzeugs

Also Published As

Publication number Publication date
EP0798261A3 (fr) 1998-12-23
EP0798261A2 (fr) 1997-10-01
SE505605C2 (sv) 1997-09-22
SE9601185D0 (sv) 1996-03-28
DE69719232T2 (de) 2003-12-11
DE69719232D1 (de) 2003-04-03
SE9601185L (sv) 1997-09-22

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