Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-05-31
2005-05-31
Goins, Davetta W. (Department: 2632)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S677000, C030S166300, C361S179000, C192S12900A
Reexamination Certificate
active
06900728
ABSTRACT:
A system and method for detecting user entry into a defined danger zone surrounding a saw blade includes a non-conducting member defining an opening therein for receiving a saw blade. The non-conducting member may comprise, for example, an insert received by an opening in the work surface or table of a table saw, scroll saw, band saw, miter saw, etc. Alternatively, it may comprise the blade guard of a radial arm saw or miter saw, for example. A conductive sensor is situated on the non-conducting member adjacent the opening to define a danger zone near the saw blade. A voltage source is coupled to the sensor, and a monitor circuit is configured to detect a change in the sensor's capacitance so as to signal a user entry into the danger zone.
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Dulaney, III Robert B
Goins Davetta W.
Home Depot U.S.A., Inc.
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