Conveyors: power-driven – Conveyor section – Pusher conveyor and separate load support surface
Patent
1991-07-05
1993-11-16
Bidwell, James R.
Conveyors: power-driven
Conveyor section
Pusher conveyor and separate load support surface
198747, B65G 2500
Patent
active
052615243
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for conveying loose material, with back-and-forth motion, of the kind that is suited for instance to convey scrap, pulverulent or grained material or also pasty material, along a conveyor chute.
Such apparatuses are known to the art
Thus, the French Published patent specification 2 077 973 discloses a conveyor for loose material which includes a chute with a static bottom shaped like a trough, which accommodates the material to convey, and a series of shutters driven simultaneously in a back-and-forth motion along the length of the chute, that motion including a rectilinear movement of translation for advancing the material, imposed by a stop that is also driven, against which the shutter comes to lean, the end of the shutter being then contiguous with the bottom of the chute, without touching it, and a movement of translation in the opposite direction, combined with a free pivoting of the shutter moving apart the stop under the effect of its rubbing against the material, in which each shutter has a generally concave profile, with a concavity turned in the direction of the advance of the material, that concave profile displaying however a flat part that is adapted to cooperate with the associated flat stop.
On the other hand, the French Published patent specification 25 79571 discloses an apparatus for conveying granular or pasty materials, which includes a chute with a static bottom shaped like a trough, which accommodates the material to convey, and a series of pulser elements supported by a movable frame driven by a motive element, in which the pulser-elements stem from the combination of a flexible blade and a rigid comb so that, during the return motion, the rigid comb moves inside the material without driving it, while the flexible blade changes shape and slides on the material, and during the forward motion of the flexible blade, cooperates with the rigid comb, thus making it possible to obtain enough rigidity in the pulser element to ensure the movement of the material.
Those two kinds of conveyance devices display an inconvenience in that, if too much material is brought at once inside the conveyance chute, it can become clogged, the conveyance members (above shutters or pulsers) then ceasing to be efficient until there is external intervention.
This clogging takes place in practice when the height of the material inside the conveyance chute becomes too great in relation to the height of the conveyance members. Indeed, the position adopted by those members, during a return run, is then such (free end portion forming an angle that is too small in relation to the direction of the movement) that those members simply slide, in both directions, and in the clearance position, on the upper surface of the material inside the chute, since the penetration force inside the material, which is a function of said angle, is not adequate.
One purpose of the invention is to solve at least in substance this clogging problem.
According to the invention, this goal is reached with an apparatus for conveying loose material, which includes a chute with a static bottom shaped like a trough, to accommodate the material to convey, and a series of conveyance members, supported in the chute by a frame movable back-and-forth, by providing for that each conveyance member is made of a blade fastened at its upper end to the movable frame and which, under the sole action of forces to which it is subjected during its movement, tends to move in an initial active position, buried inside the material, leaning on a support member, during the active run of the back-and-forth motion of the movable frame, and in a clearance position in relation to the material during the return run of the back-and-forth motion of said frame, wherein each conveyance member includes at least two juxtaposed blades said blades having lengths such that they extend to different depth inside the chute, and the depth up to which the superimposed blades extend inside the chuts decrease from the leading blade, facing the conve
REFERENCES:
patent: 544031 (1895-08-01), Draver
patent: 2751061 (1956-06-01), Nickerson
patent: 2920753 (1960-01-01), Wenger
patent: 3024765 (1962-03-01), Reed
Bidwell James R.
Ettecom S.A.
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