Weight activated platform scale
First Claim
Patent Images
1. A platform scale comprising:
- a scale base;
weight sensing apparatus supported on said base including a weight supporting platform movable relative to said base and a weight sensing mechanism responsive to movement of said platform for rotating a shaft;
a rotary dial connected to said shaft for rotation therewith and including indicia representing rotational position of said dial and thus weight on said platform;
a first sensor operatively positioned relative to said dial for sensing said indicia;
an electrically operable control connected to said sensor for determining weight on said platform responsive to sensed position of said dial and including an electronic display means providing a digital readout of such weight on said platform; and
a power circuit providing electrical power to said control from a power source for limited intervals, including a second sensor operatively positioned relative to said dial for sensing movement of said dial and exhibiting a varying electrical condition responsive thereto, and a detecting circuit electrically connected to said second sensor for connecting the power source to said control for a select interval after detecting a variation in the electrical condition of said second sensor.
9 Assignments
0 Petitions
Accused Products
Abstract
A pulse count scale includes a change of state detector circuit and an alert circuit which operate together with an electrical interrupter to detect when weight is applied on a scale platform and immediately connect power to a controller for a select interval. These circuits preserve battery power as well as providing simple operation, eliminating the requirement of actuating a separate switch prior to stepping onto the platform.
-
Citations
10 Claims
-
1. A platform scale comprising:
-
a scale base; weight sensing apparatus supported on said base including a weight supporting platform movable relative to said base and a weight sensing mechanism responsive to movement of said platform for rotating a shaft; a rotary dial connected to said shaft for rotation therewith and including indicia representing rotational position of said dial and thus weight on said platform; a first sensor operatively positioned relative to said dial for sensing said indicia; an electrically operable control connected to said sensor for determining weight on said platform responsive to sensed position of said dial and including an electronic display means providing a digital readout of such weight on said platform; and a power circuit providing electrical power to said control from a power source for limited intervals, including a second sensor operatively positioned relative to said dial for sensing movement of said dial and exhibiting a varying electrical condition responsive thereto, and a detecting circuit electrically connected to said second sensor for connecting the power source to said control for a select interval after detecting a variation in the electrical condition of said second sensor. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. In a weigh scale including a scale base, weight sensing apparatus supported on said base including a weight supporting platform movable relative to said base and a weight sensing mechanism responsive to movement of said platform for rotating a dial movable an angular amount representing weight on said platform, and a pulse generator generating a series of pulses responsive to movement of said dial, a weight activated electrical display control comprising:
-
an electrically operable control connected to said pulse generator for determining weight on said platform responsive to the number of pulses received therefrom and including an electronic display means providing a digital readout of weight on said platform; an electrical switch including a contact which changes state in response to any change in weight on said platform sufficient to cause angular movement of said dial an amount so that said pulse generator generates a pulse; and a power circuit providing electrical power to said electrically operable control from a power source for limited intervals including a detecting circuit electrically connected to said switch for connecting the power source to said electrically operable control for a select interval immediately after detecting a change in state of said switch.
-
-
8. In a weigh scale including a scale base, weight sensing apparatus supported on said base including a weight supporting platform movable relative to said base and a weight sensing mechanism responsive to movement of said platform for rotating a dial movable an angular amount representing weight on said platform, and a pulse generator generating a series of pulses responsive to movement of said dial, a weight activated electrical display control comprising:
-
an electrically operable control connected to said pulse generator for determining weight on said platform responsive to the number of pulses received therefrom and including an electronic display means providing a digital readout of weight on said platform; an electrical switch including a contact which changes state in response to change in weight on said platform, wherein said dial comprises a conductive disk including a plurality of circumferentially spaced radially extending tabs about its periphery and said switch contact comprises a conductive wiper disposed in a path of said tabs to define a closed state only in response to one of the tabs contacting said wiper; and a power circuit providing electrical power to said control from a power source for limited intervals including a detecting circuit electrically connected to said switch for connecting the power source to said control for a select interval immediately after detecting a change in state of said switch. - View Dependent Claims (9, 10)
-
Specification