Variable opening device

Details Variable opening device Variable opening device

1975-07-23

1976-05-04

Swisher, S. Clement

Measuring and testing

Measuring vessel

138 45, G01N 108

Patent

active

039540138

ABSTRACT:
A resilient tube of predetermined length, inside diameter and outside diameter has embedded therein, in axial relation, a helical winding of substantially non-resilient material. The helix is effective to resist forces exerted on the walls of the tube by internal fluid pressure tending to change the inside and outside diameters of the tube but is ineffective to resist the forces tending to lengthen the tube as the internal fluid pressure is increased or to resist the resilience of the tube material in restoring the tube toward original length as internal fluid pressure is decreased.
By using the tube as an enclosure to define an opening, the area of the opening can be selectively varied by establishing fluid pressure within the tube at the required values; and by varying the extent of the opening as a function of sample height, an accurate core sample can be obtained when the variable opening device is used in conjunction with a sampler for bulk loads of fruits or vegetables.

REFERENCES:
patent: 2590215 (1952-03-01), Sausa
patent: 3646971 (1972-03-01), Godet
patent: 3683702 (1972-08-01), O'Brien et al.

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