Closing mechanisms for concrete containers

Details Closing mechanisms for concrete containers Closing mechanisms for concrete containers

1975-02-26

1976-12-14

Reeves, Robert B.

Dispensing

With discharge assistant

Rotary

B65G 6546, B65G 6556

Patent

active

039970876

ABSTRACT:
A closing mechanism for the outlet of a concrete container and comprising a vertical shaft carrying a feed worm having at least three grooves defined by threads. Each thread extending at the outside as well as at the inside over an angle not below 360
.degree. and not exceeding 720
.degree., where n is the number of threads, and having over its whole width angles of inclination not below 8.degree. and not exceeding 15.degree.. Preferably the upper edge of each thread forms an upwards open angle of between 65.degree. and 90.degree. with the shaft, and the transition between said upper edge and the peripheral edge of the thread is rounded off with a radius of curvature of between 35 % and 55 % of the width of the thread. Further advantageously the lower edge of each thread may be curved so that over its whole length it is overlapped by the previous thread and that the outer portion of the lower part of the thread forms a rearwardly extending tongue having over the greatest part of its length a width less than one third of the width of the thread.

REFERENCES:
patent: 146107 (1973-12-01), Taggart
patent: 1881365 (1932-10-01), Martin
patent: 2023111 (1935-12-01), Alsing

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