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LDosser

"Chris Friesen" wrote in message
el...
On 03/11/2010 06:49 PM, Chris Friesen wrote:
On 03/11/2010 06:12 PM, zzzzzzzzzz wrote:

Have you read the patent claims?

"1. A table saw comprising: a frame structure with a generally flat
work
surface; a rotatable circular blade mounted on an arbor and being
adapted
to have at least a portion of said blade extending above the flat
work
surface in position to cut a work piece; a drive motor with an output
shaft
mounted to the frame structure for powering the saw blade; a sensing
mechanism for generating at least a first actuation signal responsive
to
predetermined sensed characteristics relating to the existence and/or
movement of a person in close proximity thereto; a retracting
mechanism
located beneath said work surface for rapidly moving the blade
downwardly
below the work surface responsive to said first actuation signal
being
received.

Just to clarify, the patent you're quoting from isn't actually a Sawstop
patent.

The main sawstop patents are 20020069734 and 20020170399.

Sorry, my bad. Those are applications. Gass' patents are below. The
main sawstop patents are the first three.

US7617752 - Contact detection system for power equipment - 11/17/2009
A woodworking machine having one or more dangerous portions is
disclosed. The machine also includes a safety system configured to
detect accidental contact between a person and at least one of the
dangerous portions by electrically coupling a signal to the person's
body,

How is That done? Anyone know?

and detecting if the signal becomes coupled to the dangerous portion.