CALCULATOR
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Accused Products
Abstract
A calculator'"'"'s input interface includes a knob projecting above the top face of the casing. The knob is provided to allow numbers to be input manually. It is arranged to be able to be switched selectively into a plurality of active positions by tilting it in corresponding directions from an idle position. Each direction corresponds to a different digit to be entered in the calculator. The top face of the casing also has a plurality of first keys associated respectively with mathematical operators, the first keys being positioned relative to the knob in such a way that the ends of the fingers of a user'"'"'s hand can each be located facing one of the first keys when the palm of the hand is turned downwards and the hollow of the hand covers the end of the knob.
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Citations
34 Claims
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1-14. -14. (canceled)
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15. Electronic calculator comprising a power supply, an input interface (10, 12, 14, 15) for entering numbers and mathematical operations to be carried out, a memory for storing data, a microprocessor for carrying out operations on the entered numbers, a digital display device (18) for showing the result of operations carried out on the entered numbers and a casing (20) comprising a front edge (22) and a rear edge (24) located opposite each other, the casing further comprising a base (26) and an upper face (28) both extending between the rear edge (24) and the front edge (22), the input interface (10, 12, 14, 15) comprising a lever (10) projecting above the upper face (28) of the casing (20), the lever being designed to allow numbers to be entered manually and being arranged to be able to be selectively tilted in a plurality of active positions by being inclined in corresponding directions from a rest position, each direction corresponding to a different number, the microprocessor being arranged to associate every tilt of the lever in one of said active positions with the entry of the corresponding number, the upper face (28) comprising a front input zone (34) and a rear input zone (36), the lever (10) being located in the front input zone and the rear input zone having a plurality of first keys (12) respectively associated with mathematical operators, and the input interface (10, 12, 14, 15) further comprising at least one second key (14, 15),
wherein the first keys are positioned relative to the lever so that the ends of the fingers of a hand of a user each can be located facing one of the first keys (12) when the palm of said hand is turned downwards and the hollow of said hand covers the end of the lever (10), and wherein said at least one second key (14, 15) is arranged on the casing (20) behind the lever (10) and is offset to the side relative to the longitudinal axis of the calculator so as to be facing the thumb of said hand when the fingers of said hand are facing the first keys (12), the hollow of said hand simultaneously covering the end of the lever (10).
Specification