Reading device for a watt-hour meter
First Claim
1. In a watt-hour meter for metering electrical power consumption of the type including, a rotation shaft, a disc mounted to the rotation shaft, a register means responsive to the rotation of said disc, said watt-hour meter being further provided with a reading device responsive to rotation of the rotation shaft, the reading device comprising:
- a light source means for producing a light beam;
a light detection means placed at a certain distance from the light source means, the rotation shaft being situated in a path of said light beam;
a light interrupting means operatively associated with the rotation shaft which sequentially interrupts the light beam during rotation of said shaft so as to produce light pulses on the light detection means;
a light pulse counting means operatively connected to said light detection means;
for counting light pulses on said light detection means which are representative of said electrical power consumption; and
a protective cover placed near one end of said rotation shaft, covering the light source means and the light detection means of the reading device and surrounding the rotation shaft.
6 Assignments
0 Petitions
Accused Products
Abstract
In a watt-hour meter for metering electricity consumption of the type including: a disc mounted to a rotation shaft and a register mechanism. The watt-hour meter is further provided with a reading device including a light source creating a light beam; a light detector; a light interrupting device mounted on the shaft of the disc; a pulse meter and a protective cover; wherein the light source and light detector are protected from outside light, which may influence the reading of the pulse meter, by the protective cover. This reading device may be coupled to a data transmission line via a data recorder to allow remote reading of the electricity consumption.
30 Citations
12 Claims
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1. In a watt-hour meter for metering electrical power consumption of the type including, a rotation shaft, a disc mounted to the rotation shaft, a register means responsive to the rotation of said disc, said watt-hour meter being further provided with a reading device responsive to rotation of the rotation shaft, the reading device comprising:
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a light source means for producing a light beam; a light detection means placed at a certain distance from the light source means, the rotation shaft being situated in a path of said light beam; a light interrupting means operatively associated with the rotation shaft which sequentially interrupts the light beam during rotation of said shaft so as to produce light pulses on the light detection means; a light pulse counting means operatively connected to said light detection means; for counting light pulses on said light detection means which are representative of said electrical power consumption; and a protective cover placed near one end of said rotation shaft, covering the light source means and the light detection means of the reading device and surrounding the rotation shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. In a watt-hour meter for metering electrical power consumption of the type including a rotation shaft, and a disc mounted to the rotation shaft, said watt-hour meter being further provided with a reading device responsive to the rotation shaft, the reading device comprising:
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a light source means for producing a light beam; a light detection means placed at a certain distance from the light source means in a path of the light beam; a light interrupting means mounted on said shaft which sequentially interrupts said light beam of said light source during rotation of said shaft so as to produce light pulses on the light detection means; a light pulse counting means operatively connected to said light detection means; for counting light pulses on said light detection means which are representative of said electrical power consumption; and a protective cover of a generally cube-shaped configuration made of an opaque material covering said light source means and the light detection means and partially surrounding said rotation shaft, the protective cover located near one end of said rotation shaft such that the protective cover surrounds a portion of the rotation shaft; wherein the light interrupting means comprises an opening into said rotation shaft. - View Dependent Claims (9, 10, 11, 12)
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Specification