US 8,082,825 and US 8,336,432

And the recently issued 

US 10,684,601 5G - IoT



Introducing 21st Century Machine Tool Safety Technology
US 8082825 US 8336432 US 10684601

US 8,082,825
View Patent

US 8,336,432
View Patent
 US 10,684,601
View Patent
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Revolutionary Machine Tool Safety Patents Inventor David Butler holds three patents in disruptive technology that revolutionize machine tool safety standards world wide, including the 'Black Box' non-destructive flesh-sensing safety device for table saws & existing machine tools as well as newly issued 5-G IoT data logging station patent.
Black Box Prototype World's first 'Plug & Play' non-destructive flesh-sensing safety device for table saws & existing machine tools. Stops the saw blade in 1/8 of a second, with no injury to operator or damage to equipment.
Needs No Electrical Modification The Whirlwindâ„¢ BLACK BOX used with a typical 14" band saw, requires no electrical modification. Easily switch between tools.
Customized Safety Margin Whirlwind BLACK BOX accommodates various enclosures and shields for adjusting degrees of safety.
LED Blade Lights Enclosed LEDs provide a unique super-bright blade light to focus on the cutting action and enhance operator safety.
Classroom Application When properly supervised, children can experience machine woodworking. The Whirlwindâ„¢ BLACK BOX increases safety margin for novices.
Beyond the Basics Table saw miter cuts, bevels, narrow rip cuts, non-through cuts and dadoes have all been implemented in prototype. View more photos.
Dust Extraction Superior above-table saw dust containment and extraction reduces exposure and hazard.

The BLACK BOX 'Plug & Play' Flesh-Sensing Saw Safety Stop

Senses when fingers are in danger and STOPS the saw blade in 1/8 OF A SECOND!

Developed by veteran woodworker David Butler, the patented Whirlwind Tool BLACK BOX table saw emergency blade brake is a simple bolt-on/removable device which can be easily and inexpensively incorporated into use with millions of existing saws and machine tools. The prototypes showcased on this site differ from all previous table saw blade guards and emergency blade brakes, with a built-in "electronic fence" blade enclosure. Removable, extended safety shields can be wide or narrow to offer varying safety margin depending on user comfort and experience.

If the operator approaches or touches the clear blade guard fence, the proximity detector will immediately shut down the saw motor and stop the blade, without damage, in one-eighth of a second — long before the operator can contact the spinning blade. The saw can be restarted almost immediately. Table saw miter cuts, bevels, narrow rip cuts, non-through cuts and dadoes have all been implemented with the BLACK BOX prototype.

Metal Cutting and Fabrication

Whirlwind Tool Saw Safety Brake for Metal Cutting

The BLACK BOX has been used for metal cutting and fabrication. With a simple modification to our woodworking guards we are able to cut metal on a band saw and two types of our table saws.

In addition to the revolutionary, new BLACK BOX system showcased here, Whirlwind health and safety technologies have been successfully implemented using the Makita bench top, Delta, Powermatic and Rigid saws.


Key Features

  • Flesh-Sensing technology
  • Stops blade within 1/8 second
  • Plug & Play, removable
  • No electrical modifications
  • Varying degrees of protection
  • Inexpensive relative to market options
  • Non-destructive
  • Restart immediately
  • Fits existing saw/machine tools
  • Integrated LED lighting
  • Integrated sawdust removal

The Whirlwind Hot Dog Test

Click here to view on YouTube.

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