Router with improved safety system

• US 7,784,507 B2
• Filed: 08/19/2005
• Issued: 08/31/2010
• Est. Priority Date: 09/29/2000
• Status: Expired due to Fees

• Current Assignee: Sawstop Holding LLC
• Original Assignee: SD3, LLC
• Inventors: Gass, Stephen F., Fulmer, J. David
• Primary Examiner(s): SELF, SHELLEY M
• Application Number:
  US11/208,214
• Publication Number:
  US 20050274432A1
• Time in Patent Office: 1,838 Days
• Field of Search: 144/136.95, 144/154.5, 144/371, 144/382, 144/402, 144/404, 144/394, 144/1.1, 144/136.1, 144/401, 409/188, 318/431, 318/432, 318/433, 318/434, 83/62, 83/621, 83/63, 83/64, 83/66, 83/763, 835/221.2, 835/90, 192/130, 192/132, 192138-140, 192/144, 192/148, 192/150
• US Class Current: 144/382
• CPC Class Codes: B27C 5/10 Portable hand-operated wood-milling machines; Routers
• CPC Class Codes: B27G 21/00 Safety guards or devices specially designed for other wood-working machines auxiliary devices facilitating proper operation of said wood-working machines
• CPC Class Codes: F16P 3/12 with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine F16P3/08 takes precedence
• CPC Class Codes: F16P 3/148 using capacitive technology
• CPC Class Codes: Y10T 409/306608 End mill [e.g., router, etc.]
• CPC Class Codes: Y10T 83/089 Responsive to tool characteristic

Abstract

A router is described for cutting workpieces with router bits. The router includes a safety system configured to detect one or more dangerous conditions between a person and a router bit. The safety system includes a reaction subsystem configured to perform one or more predetermined actions in the event a dangerous condition is detected. In one embodiment, the safety system is configured to detect accidental contact between a person and the router bit, and then at least partially retract the router bit the person.

Claims

1. A router for cutting workpieces with one or more router bits, the router comprising:

an operative structure including a rotatable shaft;

a motor assembly coupled to rotate the shaft; and

a safety system that includes a detection subsystem configured to detect accidental contact between an operator and a router bit coupled to the operative structure, where the safety system is configured to stop the rotation of the router bit coupled to the operative structure in the event the detection subsystem detects accidental contact between the operator and the router bit.

2. The router of claim 1, where the safety system includes a reaction subsystem configured to stop the rotation of the router bit coupled to the operative structure within 10 milliseconds after the detection subsystem detects accidental contact between the operator and the router bit.

3. A router for cutting workpieces with one or more router bits the router comprising:

an operative structure including a rotatable shaft;

a motor assembly coupled to rotate the shaft; and

a safety system that includes a detection subsystem configured to detect accidental contact between an operator and a router bit coupled to the operative structure, where the safety system is configured to stop the rotation of the router bit coupled to the operative structure in the event the detection subsystem detects accidental contact between the operator and the router bit;

where the safety system includes a reaction subsystem configured to engage at least a portion of the operative structure to stop the rotation of the router bit coupled to the operative structure.

4. The router of claim 3, where the operative structure includes a releasable coupling assembly configured to receive a router bit and rotationally couple the router bit to the shaft, and where the releasable coupling assembly is configured to rotationally uncouple the router bit from the shaft under predetermined conditions.

5. The router of claim 3, where the operative structure includes a brake engagement structure coupled to rotate with the shaft, and where the reaction subsystem includes one or more braking elements configured to engage and stop the rotation of the brake engagement structure.

6. The router of claim 5, further comprising a housing assembly configured to enclose at least a portion of the motor assembly, and where the brake engagement structure is disposed external to the housing assembly.

7. The router of claim 5, ,further comprising a housing assembly configured to enclose at least a portion of the motor assembly, and where the brake engagement structure is disposed within the housing assembly.

8. The router of claim 5, where the operative structure includes a releasable coupling assembly configured to rotationally couple the brake engagement structure to the shaft, and where the releasable coupling assembly is configured to rotationally uncouple the brake engagement structure from the shaft under predetermined conditions.

9. The router of claim 8, where the releasable coupling assembly is configured to rotationally uncouple the brake engagement structure from the shaft when a predetermined torque load is applied to the releasable coupling assembly.

10. The router of claim 9, where the releasable coupling assembly is configured to rotationally re-couple the brake engagement structure to the shaft when the torque load applied to the releasable coupling assembly decreases to a predetermined level.