Material or article handling – Wheeled – load-transporting type vehicle having driven means...
Patent
1993-08-09
1995-03-14
Bucci, David A.
Material or article handling
Wheeled, load-transporting type vehicle having driven means...
187243, 187269, 254 9C, 280 4322, 280 4323, 280 4324, 280 796, 414495, 4147451, B23Q 700, B23Q 710, B66F 708
Patent
active
053972090
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a device for transporting workpieces, in particular rods, to be machined and/or worked, with a base housing or frame which may be moved on wheels, the workpieces being carried on a bed.
BACKGROUND OF THE INVENTION
Maintenance of stocks for workpieces to be machined and/or worked represents a considerable problem, in particular in large shops with a large number of machining stations. As a rule, such workpieces are located beside the processing machine in a corresponding storage bin, a desired amount of stock being maintained in this storage bin.
In many cases the processing machines stand so close together that it is not possible for ordinary transport vehicles, such as, for example, forklifts or the like, to move between the machines. For this reason the relevant workpieces still are taken to the storage bins on simple carts and the bins are then filled by hand. This is time-consuming and unsatisfactory. The task of the present invention is to develop a device of the above-mentioned type by means of which maintenance of stock may be at least partially automated.
SUMMARY OF THE INVENTION
For solving this task a bed is connected with a base housing via a scissors mechanism and may be raised via the scissors mechanism.
This has at least the consequence that the transport device no longer has to be unloaded by hand after reaching the storage bin. The workpieces are raised by the scissors mechanism and then may be put, for example, into the storage bin. If, for example, the workpieces to be transported are rod stock, preferably there are support frames on both sides which are connected with the storage bin in an appropriate way, and, for example, have a sliding slope along which the rods may slide and enter the storage bin after the bed is lowered and the rod stock is lifted out of the bed. In this way maintenance of stock at the processing machine itself is simplified significantly.
Further, it is possible to keep the transport device so narrow that even very narrow passages between the individual processing machines may be negotiated.
Of particular significance are, on the one hand, the maneuverability of the transport device and, on the other hand, its stability during unloading. In accordance with the invention both problems are solved by providing wheels which, on the one hand, provide a very good radius of turn, but which, on the other hand, may be raised when reaching the unloading position, so that the base housing rests on the floor. These corresponding features of the device will be described further below.
In the present specific embodiment the scissors mechanism consists of arm braces which cross at a pivot. In this case one end of one arm brace is connected with the base housing via a pivot, while the other arm brace with one of its ends has a pivot with the bed. The free ends of the arm braces, on the other hand, are made so they may slide. One arm brace, which has a hinged connection with the bed, on the other end forms a sliding foot which slides on a housing floor during the scissors motion. The free end of the other arm brace, on the other hand, slides in a corresponding guide groove in the bed resp. a frame of the bed. No limit is to be set on the inventive imagination here.
It is important that the end of an arm brace, made as a sliding foot, clamp under a cross rod in the housing when the resting position of the scissors mechanism is reached, i.e. when the bed is lowered, so that the wheels, which preferably are located on the shaft which also connects the arm braces with one another, may be pushed out of the base housing. However, this means, vice versa, that when the bed is lifted the wheels are retracted, and, the base housing is set down.
Moreover, at least two pairs of arm braces parallel to one another, connected together via the shaft, are preferred.
Also, maneuverability of the device is provided with a swiveling front wheel, in the specific embodiment under consideration a swiveling front wheel of this type being provided on eac
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patent: 2706102 (1955-04-01), Cresci
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patent: 2833587 (1958-05-01), Saunders
patent: 3174722 (1965-03-01), Alm
patent: 3891108 (1975-06-01), Traficant
patent: 4744716 (1988-05-01), Pasko et al.
patent: 5105915 (1992-04-01), Gary
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