Railways – Traction – Cable
Patent
1986-10-03
1988-09-20
Reeves, Robert B.
Railways
Traction
Cable
254415, B61B 700
Patent
active
047717017
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a support head of a pulley over which a cable passes in a cable conveyor, this support head comprising a rigid frame and a pulley axle carried by this frame, a first extremity of this axle being adapted to serve as a pivot for the pulley outside the frame.
In cable conveyors, the pulleys supporting the mobile cable are pivotally mounted on support heads which are in general fixed at the extremity of a tubular arm mounted on a post or on any other fixed construction. To prevent the cable from getting out of the groove of the pulley, the latter must be as exactly as possible in the place determined by the two cable ends situated on both sides of the pulley. Now, when this plane is not vertical, the orientation of the pulleys must generally be adjusted once the cable has been set in place and appropriately stretched. To allow this adjustment, each support head is mounted on the tubular arm by means of a clamp assembly, which is made to pivot after having been loosened. One may likewise make the arm pivot on the post, or else an element of the arm on another tubular element, by means of another clamp assembly. However, these adjusting operations are long and difficult, because they necessitate relieving the pulley of the load exerted by the cable. In addition, since at least one of said clamp assemblies is necessarily at a certain distance from the pulley, any pivoting of this assembly leads to a substantial displacement of the pulley with respect to the post, which may appreciably modify the load distribution and necessitate reinforcement accordingly. It would thus be advantageous to be able to orient the pulley without substantially changing its place.
SUMMARY OF THE INVENTION
Consequently, the present invention has the object of providing a pulley support head permitting a fine adjustment of the orientation of the pulley to be effected, while the latter supports the cable, by simple and inexpensive means and without displacement of the support head.
To this end, the support head according to the present invention is characterized in that its frame is fixed and comprises mechanical means for pivoting the pulley axle pivot with respect to the frame on two substantially orthogonal pivoting axes.
According to a preferred embodiment of the invention, said pivoting axes are defined by bearing edges which are solid with the frame. The pulley axle advantageously presents a square or rectangular section in the zone of said bearing edges.
In this embodiment, the first pivoting axis is defined by a first bearing head situated in a front part of the frame, near to the pulley, while the mechanical means for pivoting the pulley axle on this first pivoting axis comprise a tie rod connected to the frame and to a second extremity of the pulley axle, and means for adjusting the length of this connecting rod and locking it. Said tie rod preferably comprises a threaded rod having one extremity articulated on the second extremity of the pulley axle and having the other extremity placed in an opening provided in an element of the frame, while said means for length adjustment and locking this tie rod comprise at least two screws mounted on this threaded rod so as to hold said frame element.
In the preferred embodiment, the pulley axle comprises, on its face arranged to bear upon the first bearing edge, stop means which are engaged against said bearing edge to fix the longitudinal position of the pulley axle. These stop means may comprise two studs fixed to the pulley axle, on both sides of the first bearing edge. The frame may further comprise a locking bar disposed parallel to the first bearing edge and on the other side of the pulley axle, so as to prevent said studs from passing over this edge.
In the preferred embodiment, the second pivoting axis is defined by a guiding fork solid with the frame and comprising two parallel bearing edges, substantially orthogonal with the first bearing edge and disposed respectively on both sides of the pulley axle for coming int
REFERENCES:
patent: 3128992 (1964-04-01), Luketa
patent: 3817484 (1974-06-01), Mundy
patent: 3902701 (1975-09-01), Orme
patent: 4358089 (1982-11-01), Metcalf
Reeves Robert B.
Stormer Russell D.
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