Abstract: A lifting truck with a telescoping mast and a balancing cylinder is disclosed. The stages of the mast are each constructed with three vertical beams. A mechanism for extending the mast are contained in or near the side beams. The balancing cylinder exerts an upward force to counter the dead weight of the telescoping stages and other parts of the truck that are lifted. The balancing cylinder is connected to the lower portion of the first stage and the upper portion of the second stage. The beams making up the stages of the mast can be tubular or U-shaped to allow space for the balancing cylinder and/or hydraulic lines or control leads.
Abstract: Narrow aisle truck that on each side includes two forward extending support legs, which each leg is provided with two support wheels. The two outer support wheels are displaced somewhat to the rear in relation to the inner support wheels, and, in the corner space outside the inner support wheels in front of the outer support wheels, lateral guide wheels are arranged.
Type:
Grant
Filed:
June 3, 2003
Date of Patent:
June 20, 2006
Assignee:
BT Industries
Inventors:
Magnus Alveteg, Mikael Svensson, Rolf Carlund
Abstract: Method to control the lowering movement of the lifting cylinder or cylinders (1, 2) of a truck. When a lowering is to take place the pump (5) is started in the pumping direction for increasing the pressure between the pump and a loadholding valve (3, 4) until essentially the pressure has been achieved as in the hydraulic cylinder (1, 2), whereafter the pump with its motor is switched over to regenerative operation, that is the pump works as motor and the motor as generator. The holding valve (3, 4) is opened so that the oil while driving the pump can flow back through this.