Abstract The present invention relates to a forced-air spreader for spreading pulverulent or granular material. This spreader comprises a frame which is adapted to be connected to a tractor and which is mounted on wheels and which carries a hopper adapted to receive pulverulent or granular material and to distribute it through proportioning units of known type to tubes of different lengths mounted on two arms pivotally connected to the hopper, pipe connections being provided whereby, from each proportioning unit, the distributed material passes transversely into the neck of a venturi which at its inlet receives air supplied by a centrifugal fan and which produces, in the respective pipe connection, a suction effect that draws in the said material, this material being entrained by the current of air, being projected out of the venturi with acceleration, and escaping through the respective pivotally mounted tube, which at its end is provided with a deflector or dividing element dispersing the material thus entrained and projected, and the pivotally mounted tubes thus effecting the uniform distribution of the material over the ground.
A forced air spreader for spreading particulate material, comprising: a frame mounted on wheels and adapted to be connected to a tractor; a hopper which is carried on the frame and which is adapted to receive particulate material; rotary proportioning units fed from the hopper; tubes of differentiated lengths disposed on two arms pivotally connected to the hopper; a series of pipe connections and a series of venturis, a pipe connection leading from each proportioning unit into the neck of a venturi; a centrifugal air blower whose outlet communicates with the inlets of the venturis, whereby in each pipe connection there is produced a suction effect drawing forth the particulate material, which is entrained by the air current in the venturi and projected out of the venturi at accelerated speed into one of the tubes of differentiated lengths; and guiding means disposed at the outlets of the tubes of differentiated lengths whereby the material entrained in and projected from the venturis is distributed uniformly over the ground.
Claim 2
Dependent Claim
167 words
A forced air spreader for spreading particulate material, comprising: a frame mounted on wheels and adapted to be connected to a tractor; a hopper which is carried on the frame and which is adapted to receive particulate material; rotary proportioning units fed from the hopper; tubes of differentiated lengths disposed on two arms pivotally connected to the hopper; a series of pipe connections and a series of venturis, a pipe connection leading from each proportioning unit into the neck of a venturi; a centrifugal air blower whose outlet communicates with the inlets of the venturis, whereby in each pipe connection there is produced a suction effect drawing forth the particulate material, which is entrained by the air current in the venturi and projected out of the venturi at accelerated speed into one of the tubes of differentiated lengths; and guiding means disposed at the outlets of the tubes of differentiated lengths whereby the material entrained in and projected from the venturis is distributed uniformly over the ground.
Claim 3
Dependent Claim
26 words
A spreader as set forth in claim 1, in which the fan is provided with drive means adapted to be connected to a tractor power takeoff.
Claim 4
Dependent Claim
49 words
A spreader as set forth in claim 1, in which the rotary proportioning units are driven by the wheels of the spreader through a variable-speed drive whereby the output of the proportioning units can be adjusted with respect to the rate of advance of the spreader over the ground.
Claim 5
Dependent Claim
34 words
A spreader as set forth in claim 1, which further comprises screens which separate the proportioning units from one another and divide the output of the proporTioning units between the tubes of differentiated lengths.
Claim 6
Dependent Claim
35 words
A spreader as set forth in claim 4, in which the arms pivotally connected to the hopper are adapted to be folded to the rear of the spreader, whereby the spreader is prepared for transportation.
Claim 7
Dependent Claim
40 words
A spreader as set forth in claim 1, in which the frame comprises an axle of adjustable length, whereby the spreader wheel track can be adjusted in accordance with the width of a tractor to which the spreader is connected.