Dual control for vehicular cranes

Traversing hoists – With motor control – Remote control or at dual control positions

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Details

74480R, 901 49, G05G 1100

Patent

active

060504315

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION

This invention relates to a dual control for vehicular cranes, comprising two control units that are placeable on opposite longitudinal sides of a vehicle and that either comprise a plurality of manually actuatable control elements, for instance levers, which cooperate in pairs insofar as the individual control element in the one unit is connected with a corresponding control element in the other unit, in order to make possible an activation of a common operating means, independently of whether the one or the other element in a pair of elements is actuated manually, each control unit comprising a casing arranged to protect the control elements, the casing having a shell-shaped part that is movable between a closed position in which the control elements are enclosed and protected, and an open position in which they are accessible from outside.


PRIOR ART

Dual controls of the type as defined in the introduction are previously disclosed in, e.g., SE 8201833-4. Further, by prior use it is known to equip the two control units with protective casings consisting of two inter-pivotably movable, shell-shaped parts which in a closed position enclose and protect the control elements, while they in an open position permit the access to the control elements. Moreover, WO 95/16630 discloses a protective casing in the form of a simple cover that is pivotable between closing and opening positions.
A drawback in connection with dual controls of the type referred to, is that they theoretically permit a simultaneous actuation by both control units. If the permanent crane operator, normally the vehicle driver, actuates an individual control element in one of the control units, for instance on the driver's side of the vehicle, it is possible for another person to intentionally or unintentionally actuate another control element in the other control unit, on the opposite longitudinal side of the vehicle. This implies that the crane could be subjected to motions that are not at all intended to be executed by the permanent crane operator. For instance, said operator could actuate a control element for only lowering the crane beam and a load hanging on it, at the same time as somebody not directly concerned actuates an element comprised in the opposite control unit, which element makes the crane beam pivot laterally. In practice, such a situation may of course have disastrous consequences, for the load object as well as the environment.


OBJECTS AND FEATURES OF THE INVENTION

The present invention aims at eliminating the above mentioned safety risk related to previously known dual commands and create the conditions for a reliable control of the different functions of the crane. Therefore, a basic object of the invention is to further develop the protective casings known per se for the two control units of the dual command to such an extent that a simultaneous actuation of individual control elements in the units is rendered impossible. One object is also to bring about this increased safety by means of simple, mechanical means which are not dependent on the supply of electricity or hydraulic oil.
According to the invention, at least the basic object is attained by the features as defined in the characterizing clause of claim 1. Advantageous embodiments of the invention are further defined in the dependent claims.


BRIEF DESCRIPTION OF THE APPENDED DRAWINGS

In the drawings:
FIG. 1 is a perspective view of a vehicular crane with a dual command, whose two control units are built into protective casings,
FIG. 2 is a partial, enlarged perspective view showing the protective casing of the one control unit, in an open state,
FIG. 3 is a schematic view of a first embodiment of the invention, each one of the two protective casings of the control units being shown in a closed state,
FIG. 4 is a corresponding view showing one of the protective casings in an open state, at the same time as the other protective casing is closed,
FIG. 5 is a view corresponding to FIG. 3, showing a second, alternative embodi

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