US 4,289,619 AGranted

Material handling apparatus

OwnerMilo J. Sampsoninventor

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Abstract

With a screen disposed in a flowing waterstream of sewage and other waste materials to intercept objects such as rags, plastic, wood, metal, fragments of masonry and the like, such objects are removed from the screen by a reciprocating mechanical rake to a point of disposal or further treatment. Elongated rods secured at one end to the rake are pivotally connected at the other end to a power driven endless chain for travel therewith towards and away from the screen with such chain and power supply being remotely located at a point free of contact with the waterstream. The screen shown with this invention is one formed of parallel spaced longitudinal bar grates and teeth on the rake extend between the grates as the rake travels on a lower track during its debris removal stroke effected by the rod connection to the chain and the moving chain draws the rods into engagement with a fulcrum at the end of the cleaning stroke for tilting the rod and rake upwardly for registration of the rake with an upper track so that the continuing travel of the chain in reversing its direction moves the rake through the rod connection on the upper track in a return stroke out of engagement with the screen to a point where the rake drops by gravity onto the lower track in engagement with the screen for another debris removal stroke. Debris adhering to the rake at the end of the cleaning stroke will fall therefrom by gravity as the rake is tilted in transfer from the lower track to the upper track.

Claims11

Dependent claims

In a screening apparatus adapted to be disposed in a refuse laden waterstream to collect debris therein and a rake disposed for reciprocal movement relative thereto to remove collected debris, the combination therewith of:

an elongated frame defining respective upper and lower end portions,
said screening apparatus mounted on said lower end portion,
respective lower and upper parallel tracks extending longitudinally of said frame at said lower end portion,
said rake adapted to slidably ride on said lower track in engagement with said screening apparatus in an upwardly cleaning stroke and to slidably ride on said upper track out of engagement with said screening apparatus on a downwardly return stroke,
a power driven endless chan operably mounted on said frame at said upper end portion to move in respective directions towards and away from said screening apparatus,
an elongated rod pivotally connected at one end to said chain for movement therewith in its path of travel and secured at its other end to said rake,
fulcrum means on said frame in said upper end portion in the line of travel of said rod,
movement of said chain away from said screening apparatus acting through said rod to slide said rake on said lower track in its cleaning stroke, and
movement of said chain in reversing its direction towards said screening apparatus effecting the engagement of said rod with said fulcrum means and the resulting upwardly tilting of said rod and said rake to a position where further movement of said chain towards said screening apparatus acts to move said rake on said upper track on its return stroke.

6 more elements

Dependencies are inferred from the claim text.