Portable weighing device having improved resolution
OwnerArthur E. Gealtinventor
Life of this patent
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Abstract
A portable device for weighing objects is provided in which the object being weighed is supported against gravity by a self-aligning tension spring and a supporting frame. The device utilizes an indicator which carries no substantial part of the load, but senses the position of the lower, free end of the resilient measuring means, through the use of an activator probe, self-aligned with the resilient measuring means. The device can further provide high resolution to one part in one thousand while minimizing the inherent non-linearity in the no-load portion of its spring deflection curve.
Claims21
In a portable device for weighing objects of the type having a supporting frame and indicator means disposed on said frame, said indicator means having an internal resilient means for causing said indicator means to provide a reading proportional to the weight of an object, the improvement comprising:
- (a) activator probe means extending from said indicator means and slidably mounted thereon for engaging said internal resilient means;
- (b) resilient measuring means attached to said frame for supporting the weight of said object, said resilient measuring means disposed in an amount of tension sufficient to cause the calibration curve of the device to be substantially linear;
- and
- (c) an extension member disposed within said resilient measuring means, said extension member abutting said activator probe means, said extension member and said resilient measuring means applying a compressive force to said activator probe means to cause said internal resilient means to be compressed prior to weighing an object.
Dependencies are inferred from the claim text.