Tablet or capsule drop tube assembly

Details Tablet or capsule drop tube assembly Tablet or capsule drop tube assembly

1990-07-09

1992-01-21

Fox, John C.

Valves and valve actuation

Tube compressors

Fluid pressure actuated

137613, F16K 702

Patent

active

050822365

ABSTRACT:
A drop tube assembly for feeding particulate material such as tablets or capsules between an upper level and a lower level is disclosed. The assembly employs a pair of vertical tubes, including an outer tube and a flexible inner tube. The flow of particulate material is controlled by introducing air under pressure between the tubes so as to reduce the diameter of the inner tube and thus constrict the vertical passageway interior of the inner tube. The flexibility of the inner tube and the pressurized air flow are controlled to allow the passageway to be closed initially along approximately 80 to 90 percent of the length of the tube. Air may be exhausted to open the passageway. The length and number of tubes in series can be varied depending on the length of the drop as well as the fragility of the material.

REFERENCES:
patent: 2291912 (1942-08-01), Meyers
patent: 2604246 (1952-07-01), Hood
patent: 3397860 (1968-08-01), Bushmeyer

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