US Patent: 2,549,190
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| Weighing Scale Indicator
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Patentee:
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| Fred W. Gilchrist (exact or similar names) - Toledo, OH |
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Patent Dates:
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| Applied: |
May 19, 1945 |
| Granted: |
Apr. 17, 1951 |
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Joel Havens
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Description: |
| Marshall & Marshall - patent attorneys
This invention relates to weighing scale indicators and in particular to a maximum load indicator for use in a sensitive fan scale. Maximum load indicators when applied to weighing scales introduce small errors in the weight indication because of their friction. It is desirable that the friction be made as low as possible, yet it may be made so small that the indicator will not remain in position but will move away from the correct indication if the weighing scale housing is bumped or subjected to vibration. It is possible to satisfactorily add maximum load indicators to dial scales because a relatively large amount of power is available to overcome their friction. Previous attempts to provide maximum load indicators for fan scales have met with failure because of the small amount of power available at the indicator and the resulting large errors due to variations in friction of the maximum load indicator. The object of this invention is to provide a maximum load indicator for a fan scale, which indicator has sufficient friction to prevent erratic movement yet whose friction is sufficiently small so as to introduce negligible error into the weight indications. Another object of the invention is to provide braking means for a maximum load indicator which braking means are releasable by a weighing indicator. These and other objects and advantages are attained according to the invention by providing a track fashioned of wire or similar material that lies parallel to the path of the weighing scale indicator and a slider or maximum load indicator mounted on the track in such a manner that the weighing scale indicator may engage and drive the slider along the track. The slider is made as light as possible and is provided with spring means which engage the track to provide a slight amount of friction to hold the slider in position. The spring is so shaped that when it is engaged by the weighing scale indicator to move the slider along the track it tends to relieve the pressure with which the spring engages the track. In this manner sufficient friction is obtained to hold the slider accurately in position and yet the friction is sufficiently reduced so that it does not affect the accuracy of weight indication.
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