Conveyors – chutes – skids – guides – and ways – Rollerways – Submerging and rising
Patent
1997-09-23
1999-04-06
Valenza, Joseph E.
Conveyors, chutes, skids, guides, and ways
Rollerways
Submerging and rising
1984596, 1984634, B65G 13075, B65G 4734
Patent
active
058905774
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to the general field of dynamic storage of pallet-type loads, for instance; it relates more particularly to a safety system for the load separation devices in dynamic storage chutes.
2. Discussion of Background
The dynamic storage facilities are made up of chutes fitted with rollers or cylinders mounted parallel to one another on beams forming a frame which is tilted from its upstream to its downstream section. These rollers and/or cylinders determine a raceway on which the loads, generally handling pallets, are placed.
In order to suppress the problems associated with the extraction of the loads located at the lower portion of the storage chute, and notably that of the pressure exerted onto the end load by the accumulation of the upstream loads, a load separation device is commonly used at the level of the downstream end of the chute. This device is suited to isolate at least the first load, located downstream on the facility, with respect to the other loads which are waiting, upstream, in order to allow smooth extraction of this first load, without causing any problems, using for instance a fork-lift.
These separation devices are constituted of a pedal and of a stop, interconnected by a pole- or a tie-shaped linking rod. The pedal has been accommodated at the end of the chute and is designed to be actuated by the downstream load; the stop is used to retain the upstream load(s) in order to separate them from the load located at the downstream end. This stop is brought into active retaining position by the pedal when the latter is actuated by the end downstream load and it is de-actuated when the said downstream load is removed, in order to let the following load take its place at the end of the chute and actuate, in turn, the pedal as well as the retaining stop for the other loads.
Moreover, to provide greater safety when handling the load removed downstream of the chute, it proves interesting to retain the upstream load(s), to give some time to the operator to remove the downstream load without being affected by the pressure of the other loads on the chute. In this view, the load separation devices are usually fitted with means enabling to prevent too soon a release of the stop when removing the downstream load.
The documents FR-2 639 331 and DE-GM 7 534 405 describe two separation devices. In both these facilities, the end pedal controls the retaining stop directly, via a tie rod or a pole. The retaining stop is rotatably mounted on an articulation axis and it is subject to balancing means round the said axis which tend, by themselves, to bring the pedal back into raised position and to put the said stop in inactive position. These balancing means enable handling the separation device with minimum encumbrance; the end pedal can be actuated by any type of load, even by very light loads.
The separator according to the document FR-2 639 33 1 follows a principle in which the control of the stop is delayed by a particular interconnection between the handling pedal and the pulling rod. In such a case, the beginning of the motion of the pedal, linked to the extraction of the end load, has little influence on the motion of the stop; when the pedal reaches the end of its stroke, its motion is transmitted integrally to the said stop, until the latter is de-actuated.
With this separation device, the retaining stop is automatically de-actuated as soon as there is no contact between the pedal and the end load any longer. In spite of the provisions adopted to delay this de-actuation, the construction features of these gearworks cause quite a rapid release of the stop.
In the document DE-GM 7 534 405, the arrival of a load at the end of the chute actuates the retaining stop located upstream, but also a system to lock the pedal in lower position. The end load can be removed and handled without modifying the position of the separation device and hence without de-actuating the retaining stop. This de-actuation is carried out by a positive manoe
REFERENCES:
patent: 5213189 (1993-05-01), Agnoff
Deuble Mark
Sipa-Roller
Valenza Joseph E.
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