Attachment for a portable router

• US 3,332,462 A
• Filed: 04/30/1965
• Issued: 07/25/1967
• Est. Priority Date: 04/30/1965
• Status: Expired due to Term

• Current Assignee: Fred L. Williams
• Original Assignee: Fred L. Williams
• Inventors: Williams, Fred L.
• Application Number:
  US04/452,229
• Time in Patent Office: 816 Days
• US Class Current: 144/251.1
• CPC Class Codes: B23B 51/0054 Drill guiding devices
• CPC Class Codes: B23Q 35/104 with coaxial tool and feeler

Claims

1. IN COMBINATION WITH A PORTABLE ROUTING TOOL HAVING A PLANAR BASE PLATE AND CUTTING TOOL ROTATING ABOUT AN AXIS PERPENDICULAR TO SAID PLATE, AN ATTACHMENT TO FACILITATE USE OF SAID TOOL IN TEMPLATE ROUTING COMPRISING:

FIRST MEANS COMPRISING A FIRST PLANAR SURFACE DEFINING A CENTRAL APERTURE AND ADAPTED TO BE SECURED TO SAID PLANAR BASE PLATE, SECOND MEANS COMPRISING A SECOND PLANAR SURFACE ADAPTED TO FIT IN SAID CENTRAL APERTURE AND A CIRCULAR CYLINDRICAL BOSS PROJECTING THEREFROM, SAID BOSS DEFINING A TOOL RECEIVING APERTURE EXTENDING THERETHROUGH AND HAVING A DIAMETER AT LEAST EQUALLING THE DIAMETER OF THE CYLINDER OF REVOLUTION DEFINED BY SAID CUTTING TOOL, RESILIENT SUPPORT MEANS FOR SUPPORTING SAID SECOND MEANS WITH SAID SECOND PLANAR SURFACE PARALLEL TO SAID FIRST PLANAR SURFACE AND WITH SAID TOOL RECEIVING APERTURE IN AXIAL ALIGNMENT WITH THE AXIS OF SAID CUTTING TOOL, SAID RESILIENT SUPPORT MEANS INCLUDING MEANS FOR RESILIENTLY URGING SAID SECOND MEANS OUTWARDLY ALONG THE AXIS OF SAID CUTTING TOOL AND TOWARDS ITS TIP TO THEREBY MOVE SAID CIRCULAR BOSS TO A POSITION SURROUNDING AND PROTECTING SAID CUTTING TOOL, WHEREBY THE EXERTION OF FORCE ON SAID ROUTING TOOL AGAINST A TEMPLATE WHEN SAID BOSS IS INSERTED IN A PATTERN CUT INTO SAID TEMPLATE FORCES SAID SECOND MEANS ALONG THE AXIS OF SAID CUTTING TOOL AGAINST THE ACTION OF SAID RESILIENT SUPPORT MEANS UNTIL SAID SECOND PLANAR SURFACE IS CO-PLANAR WITH SAID FIRST PLANAR SURFACE OT THEREBY EXPOSE THE END OF SAID CUTTING TOOL AND PERMIT A ROUTING OPERATION WITHOUT THE POSSIBILITY OF CONTACT BETWEEN SAID CUTTING TOOL AND SAID TEMPLATE.