(19)
(11) EP 1 046 610 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
30.11.2005 Bulletin 2005/48

(43) Date of publication A2:
25.10.2000 Bulletin 2000/43

(21) Application number: 00850068.8

(22) Date of filing: 18.04.2000
(51) International Patent Classification (IPC)7: B66F 9/22, F15B 13/02
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 20.04.1999 SE 9901408

(71) Applicant: BT Industries Aktiebolag
S-59581 Mjölby (SE)

(72) Inventor:
  • Joelsson, Bengt
    575 92 Hult (SE)

(74) Representative: Berglund, Erik Wilhelm 
Berglunds Patentbyra AB Aspebraten
590 55 Sturefors
590 55 Sturefors (SE)

   


(54) Device and method for movement of a load carrier at an industrial truck


(57) Device and method for movement of load carrying means of an industrial truck, in particular the pivot and lateral movement of a swing reach fork means. Hydraulic consumers (30, 32) provide the movements. A proportional valve (38, 40) is arranged in front each hydraulic consumer. The proportional flow valve (40) of the pivot movement has its inlet (58) connected to the outlet (56) of the other. At lateral movement the motor speed is controlled and the proportional flow valve (38) is held open. At pivot movement or simultaneous movement of both the motor speed is set so that the total flow somewhat surpasses a maximum value at the same time as the proportional flow valves (38, 40) are controlled to desired primary flow.






Search report