Material or article handling – Wheeled – load-transporting type vehicles and means for... – With means on each vehicle cooperating to effect – or...
Patent
1997-01-15
1998-08-18
Bucci, David A.
Material or article handling
Wheeled, load-transporting type vehicles and means for...
With means on each vehicle cooperating to effect, or...
414346, 414347, 414495, 414786, B60P 164
Patent
active
057951233
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION AND PRIOR ART
This invention is related to a method for transferring load units between two carriers.
The prior art may roughly be divided into the following categories: equipments are arranged on the first carrier for elevating the load unit resting on the second carrier so far that the arm and the carrying member may be pushed in under the load unit, whereupon the latter is moved over to the first carrier by displacement of the carrying member along the arm. The lifting equipments have in practice the character of relatively complicated crane like arrangements based upon only partial lifting of the load unit being carried out by inclining the load unit towards one side. This partial lifting means that the load unit leaves the engagement with the securing members arranged on the second carrier at least as far as some of the securing members is concerned, which jeopardises holding of the load unit on the second carrier. Speaking in general terms, inclination of the load unit in the described manner involves a great danger. lifting members capable of elevating, after introduction of the carrying member under the load unit, the load unit out of contact and engagement with the second carrier such that the load unit then may be transferred to the first carrier. This category involves the disadvantage that it requires a considerable degree of complication of the design of the load carrying structure of the second carrier since the arm, carrying member and the lifting members arranged thereon must be capable of getting under the load unit. More specifically, this requires particular channels or similar recesses in the load carrying structure of the second carrier (see for instance the Swedish patent No. 7613978-1). The need for providing the carrying member itself with lifting members capable of entirely elevating the load unit and maintaining the same elevated during at least parts of the transfer course involves a relatively complicated design of the carrying member and also that the same tends to be rather bulky, at least in vertical direction, a fact which contributes to the complicated load carrying structure and makes its extent in vertical direction rather great, which in its turn involves a reduction of the total load volume on the carrier.
SUMMARY OF THE INVENTION
The object of the present invention is to develop the prior art such that the inconvenience discussed hereinabove are eliminated or at least reduced.
By designing the securing members on the second carrier, and possible also on the first, in this way as vertically moveable, possibilities are created to locate the load unit in an elevated position such that the arm and carrying member may be located under the load unit without necessitating for that purpose complication of the load carrying structure in a degree worth mentioning. Thus, it is no longer necessary to provide the carrying member itself with any lifting members, which on their own are capable of elevating the load unit, but the load unit is applied on the carrying members by lowering the securing members from an upper position to a lower.
Securing members of the kind in question here and conventionally arranged on load vehicles may, in accordance with the invention, relatively easily be replaced by such which are vertically movably arranged in order to be able to operate the load units between upper and lower positions. This means that the load carrying structure for the rest does not have to be subjected to any changes at all, apart from the fact that possible local reinforcements may have to be provided where the transfer arm is intended to rest on the load carrying structure.
Further features and advantages of the solution according to the invention appear from the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the enclosed drawings a more specific description of an embodiment of the invention cited as an example follows hereinafter.
In the drawings:
FIGS. 1-5 are diagrammatical views illustrating transfer of a lo
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patent: 4728241 (1988-03-01), Edelhoff et al.
patent: 5421687 (1995-06-01), Wayman
patent: 5467827 (1995-11-01), McLoughlin
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