Pettibone, LLC

Milton Stone

Control apparatus and a method for making battery paste by mixing selected quantities of lead oxide, sulfuric acid and water to form a reaction mixture are disclosed. During the reaction portion of the process, the viscosity of the mixture initially descends on a time-viscosity curve, which then changes in slope to reach a point of minimum viscosity. The temperatures of the reaction mixture form a time-temperature curve having a temperature peak therein. The temperature and the viscosity of the reaction mixture are determined respectively by temperature sensing devices and by viscosity sensing devices. In response to the temperature of the reaction mixture rising to a predetermined temperature or above as determined by the temperature sensing devices and to the viscosity thereof being at or above a predetermined value as determined by the viscosity sensing devices, coincidence devices actuate a valve controlled water supply to add a quantity of water to the reaction mixture, until the viscosity thereof is reduced to a value below the predetermined value. The predetermined temperature corresponds approximately to at least one of (a) a temperature at which a predetermined time-viscosity curve reaches a point adjacent to the minimum viscosity, and (b) a temperature at a point on a predetermined time-temperature curve which corresponds to said predetermined time-viscosity curve, a point adjacent to and below its peak. The water content of the reaction mixture is adjusted thereby, as needed, so as to approximate the water content desired in the final product.

Method and apparatus for making battery paste

A level control system involving both an apparatus and a method for a rotary feed hopper of the inverted, open-ended, truncated cone-type, wherein heavy paste-like viscous material which is fed into the large open upper end of the feed hopper is delivered or discharged through the small lower end of the hopper. A load meter in connected relation with the motor which drives the hopper senses the power required to drive the hopper and thus indirectly indicates the quantity of the material in the hopper, and consequently, the height or level of the material. When the load on the motor reaches a predetermined maximum the feed of material to the hopper is discontinued thus preventing overflow. When the load on the motor reaches a predetermined minimum the feed of material into the hopper is resumed.

Level control system for a rotary cone-type feed hopper

An apparatus for adding trim water or liquid to a mixture in a powered mixer and controlling the amount automatically. After a selected temperature has been signalled by a temperature sensing device, the water or liquid is pulsed into the mixer, each pulse being followed by a dispersion time, until a selected power level is detected by a power sensing device, the selected power level having previously been correlated through testing with a desired characteristic of the mixture. When the selected power level is detected, a signal from the power sensing device terminates the water or liquid addition.

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Chicago, IL, United States of America

Milton Stone