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US 4,913,248 AGranted
Portable weighing scale
AssigneeAran Engineering Development Ltd.
InventorAvi Zakai
Life of this patent
Estimating the term…
Abstract
A compact electronic weighing scale whose major dimension is not substantially greater than the width of an average adult shoe and comprises a capacitive load cell adapted to be acted upon by an annular load transmission element coupled to the weighing platform. The capacitive load cell and the load transmission element are so dimensioned that the change in capacitance of the load cell in response to a load acting upon the weighing platform is substantially uniform regardless of the point of application of the load on the weighing platform.
Claims13
In a weighing scale:
- a capacitive load cell comprising a pair of spaced apart electrically conductive plates, at least one of which is capable of resilient deformation, said plates being insulated with respect to each other, and
- a load transmission element adapted to bear on the capacitive load cell so that in response to a load applied to the load transmission element the plates are resiliently displaced towards each other thereby increasing their capacitance;
- said capacitive load cell and load transmission element being so dimensioned that the change in capacitance of the capacitive load cell is substantially uniform regardless of where on the load transmission element the load is applied.
A weighing scale including:
- a split casing comprising mutually displaceable first and second sections,
- a pair of spaced apart electrically conductive plates constituting a capacitive load cell, at least one of said plates being capable of resilient deformation, said plates being fixedly mounted to the first section whilst being insulated with respect to each other;
- a load transmission element coupled to the second section and adapted to bear on the capacitive load cell so that in response to a load applied to the second section the plates are resiliently displaced towards each other thereby increasing their capacitance,
- signal processing means coupled to the capacitive load cell and responsive to a change in capacitance thereof for generating an output signal representative of the applied load,
- said capacitive load cell and load transmission element being so dimensioned that the output signal is substantially uniform regardless of where on the second section the load is applied, and
- display means for displaying data representative of the output signal.
3 more elements
Dependencies are inferred from the claim text.