Buckles – buttons – clasps – etc. – Belt fasteners – Hinged
Patent
1996-03-20
1997-09-23
Cuomo, Peter M.
Buckles, buttons, clasps, etc.
Belt fasteners
Hinged
1988442, F16G 304
Patent
active
056691149
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
PRIOR ART
Conveyor belts are used in mines quarries and various industries. They comprise known junctions, obtained by joining the two ends of the conveyor belt, for instance by vulcanization, or by fitting the edge of each one of the belt edges with a row of staples, generally U-shaped, arranged side by side. The curved part of these staples projection outwardly beyond the edge of the belt on which the staples are placed, the dimension of this projecting part being, in the transversal direction of the conveyor, approximately equal to half of the dimension of the two lugs of the staple located respectively on the upper side and on the lower side of the end of the conveyor belt. Gaps are thus formed, in the transversal direction of the conveyor belt, between the curved projecting parts, although the staple lugs are positioned side by side.
These gaps are provided for receiving the projecting portions of the projecting curved parts of the staples belonging to the staple row fixed on the other end of the conveyor belt, when the ends are brought close to each other in order to carry out the junction.
The fixing of the staples on the end of the conveyor belt is carried out in a known way by means of simple or dual nails or points which are passed from one of the sides of the conveyor belt through holes purposedly drilled in one of the lugs of each staple, then by stitching through the conveyor belt. Last holes are drilled in the other lug of each staple, in alignment with the corresponding through hole of the other lug, and the projecting part of the point being is folded down in longitudinal grooves provided on the lug from which it projects. This arrangement is used in order to avoid an overthickness above the level of the external surface of the lug.
The concave parts of the lugs of both rows of lugs form a series of eyelets interleaved side by side. A connecting and hinging rod can be passed through, the exclets from one of the sides of the conveyor belt.
Once the connecting and hinging rod is passed through, the assembly thus obtained acts like a flexible hinge linking the two ends of the conveyor belt, which are thus articulated.
The belt can then be submitted to the suitable mechanical tension of operation, for instance by moving the idle pullers away from each other. When submitted to this mechanical tension, only the front concave parts of the staples bear upon the linking and hinging rod, over approximately 180.degree.. These concave parts have a half-circle shape, in order to bear uniformly against the linking and hinging rod having a round cross-section.
In course of operation the staples are submitted to various stresses. The most obvious stress is that corresponding to the wear of the front concave parts of the staples which is caused by the friction against the linking and hinging link against which they bear.
This stress is most often amplified by the presence of abrasive particles rejected by the material carried on the conveyor belt (coal, minerals, sand). Since the assembly formed by the staples leave gaps therebetween, mainly between the front convex part of the staples and the opposed edge of the conveyor belt, these particles pass through these gaps and are spread under the conveyor.
The other stress concerns the tension exerted on the staple lugs, this tension being transmitted to the fixing points and through these to the conveyor belt, thus tending to tear the latter. This tension may lead to a shifting of at least certain of these lugs with respect to the end of the conveyor belt, in its longitudinal direction. This shifting may be unequaly distributed between the displaced lugs, some of them moving more than the others. A misalignment of the eyelets may result, and therefore a certain concave parts of the staples bear against the linking and hinging line with a smaller force for certain staples, and even with no force at all. This reversely increases the force borne by the staples which have been slighty moved. It is easily inderstood that this situatio
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ASER
Cuomo Peter M.
Sandy Robert J.
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