Abstract A router subbase attachment to the base of the router, the subbase having an annular attaching portion and a radial arm carrying a main guide track longitudinally adjustable thereon by means of plural bolt and slot connections. The main guide track is provided with pin receiving openings and may have detachably affixed thereto guide track extensions. A trammel pin unit embodying a pin and circular base can be employed wherein the base is adhesively secured to the surface of the workpiece thus precluding the need for driving a pin into the workpiece. Various types of contour guide elements may be attached to the outer end of the main guide track and the coupling connection consisting of interfitting coupling bar and dovetailed recess respectively at the forward end of the guide track extension and at the rear of the main guide track is such that the dovetailed recess may have positioned therein a contour guide element having a coupling head. In addition the base of the router which is annular is provided with a slot so that a trammel pin may be located between the circumferential confines of the base so as to enable to cutting of a small diameter circle.
A guide structure attachment for a router having a lower flat annular base, comprising: a. a subbase detachably secured to the router base, b. an integral radial arm extending outwardly from said subbase, c. a main guide track movable supported on said radial arm to selected positions thereon. d. fastener means for securing said guide track in its selected position directly to said radial arm, and e. at least one trammel pin opening provided on said guide track, wherein: f. said subbase includes a flat annular portion abutting the underside of the router base to which it is detachably secured, g. said radial arm being coplanar with said annular portion and integral therewith, and h. both said annular portion and said radial arm being of uniform thickness with the upper and lower sides thereof lying in parallel planes, i. a longitudinal rectangular recess in the underside of the radial arm extending from the inside periphery of the annular portion to the outer terminal end of said radial arm, j. a longitudinal radial slot extending centrally of the rectangular recess from the bottom thereof through the upper side of the radial arm and corresponding in length to the length of said recess, and k. said guide track being dimensioned for slidable tracking longitudinal movement in said recess with the underside of the guide track coplanar with the lower side of the radial arm.
Claim 2
Dependent Claim
232 words
A guide structure attachment for a router having a lower flat annular base, comprising: a. a subbase detachably secured to the router base, b. an integral radial arm extending outwardly from said subbase, c. a main guide track movable supported on said radial arm to selected positions thereon. d. fastener means for securing said guide track in its selected position directly to said radial arm, and e. at least one trammel pin opening provided on said guide track, wherein: f. said subbase includes a flat annular portion abutting the underside of the router base to which it is detachably secured, g. said radial arm being coplanar with said annular portion and integral therewith, and h. both said annular portion and said radial arm being of uniform thickness with the upper and lower sides thereof lying in parallel planes, i. a longitudinal rectangular recess in the underside of the radial arm extending from the inside periphery of the annular portion to the outer terminal end of said radial arm, j. a longitudinal radial slot extending centrally of the rectangular recess from the bottom thereof through the upper side of the radial arm and corresponding in length to the length of said recess, and k. said guide track being dimensioned for slidable tracking longitudinal movement in said recess with the underside of the guide track coplanar with the lower side of the radial arm.