Tonnage indicator for toggle press

Details Tonnage indicator for toggle press Tonnage indicator for toggle press

1980-05-29

1981-11-03

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to force

7386254, 7386258, G01L 500

Patent

active

042979013

ABSTRACT:
Apparatus is disclosed for indicating the final tonnage produced by a press having a toggle mechanism actuated by a closing means. The apparatus comprises means for measuring the closing force exerted on the toggle mechanism by the closing means, means for detecting the initial peak closing force measured by the measuring means, means for converting the initial peak closing force to a final press tonnage value preferably using a proportional relationship, and means for outputting the final press tonnage value. In addition, the apparatus may include switch means for disconnecting the measuring means from the detecting means after the detecting means has detected the initial peak closing force. The apparatus is easily adaptable to most presses having toggle mechanisms such as those used in injection molding machines, and may be used to provide an accurate tonnage indication without the necessity of directly measuring tonnage such as by mounting strain gages on the tie bars.

REFERENCES:
patent: 2924968 (1960-02-01), Colten et al.
patent: 3101610 (1963-08-01), Rosander
patent: 3897680 (1975-08-01), Grundmann et al.
patent: 4122704 (1978-10-01), Lutenegger et al.

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