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US 4,400,117 AGranted
Insert type milling cutter
AssigneeMilling Specialties, Inc.
InventorTheo J. Smith
Life of this patent
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AssigneeMilling Specialties, Inc.
InventorTheo J. Smith
Estimating the term…
A rotary milling cutter has a body with one or more insert seats on the body. A cutting insert is disposed in each seat and is locked in place by means of a pair of fasteners which are threaded into corresponding tapped holes in the cutter body adjacent the seat. Each insert contains a pair of spaced grooves on a surface of the insert adjacent the fastener. The axis of each fastener is disposed in the same plane as and at an acute angle to the axis of a corresponding groove. As each fastener is advanced into its threaded hole, a circular edge of the head of the fastener lodges in the corresponding groove exerting a locking force to lock the insert in place in its seat. The grooves have elliptically contoured cross sections conforming to the elliptical projections of the circular edges of the fastener heads when viewed axially of the grooves. There is also a counterbore at the near end of each threaded hole for receiving the head of the corresponding fastener.
A rotary milling cutter having a body, at least one insert seat on said body, a cutting insert disposed in each such seat, each such insert having a cutting edge spaced from its seat, each insert having a first surface portion disposed against its seat and a second surface portion opposite its first surface portion, and means for releasably locking each insert in its seat comprising a pair of indentations in the second surface portion of each insert and a pair of threaded holes in the cutter body, each of said pair of threaded holes corresponding to a corresponding one of the insert indentations and having its axis disposed at an acute angle relative to the location on the second surface portion of the corresponding insert at which the corresponding indentation is located, and a pair of fasteners each having a threaded shank threaded into a corresponding one of the pair of threaded holes, and means on the end of each fastener exterior of the corresponding hole which, upon threading of the fastener to the hole, engages the corresponding indentation thereby locking the insert in the seat, wherein each such insert has four sides extending lengthwise of the insert with adjacent sides being generally at right angles to each other, said first surface portion of each insert corresponding to two adjacent ones of said four sides and said second surface portion of each insert corresponding to the remaining two of said four sides, said indentations being in one of said remaining two sides and spaced from each other in a direction lengthwise of the insert, said indentations being grooves each of whose length is transverse to the length of the side of the insert which contains said grooves, said grooves being parallel to each other and identical in shape, and wherein each of said grooves has a cross section transverse to its length which is of concave elliptical contour and wherein said means on the corresponding fastener engaging the elliptical contour of each groove comprises an elliptical contour of convex cross section when viewed lengthwise of the groove and corresponding to that of the groove.
A rotary milling cutter having a body, at least one insert seat on said body, a cutting insert disposed in each such seat, each such insert having a cutting edge spaced from its seat, each such insert having a first surface portion disposed against its seat and a second surface portion opposite its first surface portion, and means for releasably locking each such insert in its seat comprising a groove in the second surface portion of the insert, a threaded hole in the cutter body having its axis disposed in same plane as and at an acute angle relative to the axis of the insert groove, a fastener having a threaded shank threaded into said threaded hole, and means on the fastener exterior of the threaded hole comprising an edge which is circular when viewed axially of said hole and fastener and which is elliptical having a convex elliptically contoured segment facing the groove when viewed axially of the groove, said groove having a transverse cross section with a smooth concave contour complementary and congruent to said convex elliptically contoured segment so that as the fastener is advanced into said hole, said edge congruently fits into and engages with said groove to lock the insert in its seat.
An insert for use with a rotary milling cutter body containing an insert seat on which the insert is adapted to releasably locked by means of fastening means having a threaded shank threaded into a threaded hole in the body, said insert comprising a first surface portion adapted to be seated against the insert seat and a second surface portion opposite said first surface portion, said second surface portion including at least one groove having a concave transverse cross sectional shape whose contour corresponds to a segment of an ellipse and which is adapted to congruently receive the edge of a fastening means which is so disposed that it presents to the groove a convex elliptical contoured segment congruent to the transverse cross section of the groove.
A rotary milling cutter having a body, at least one insert seat on said body, a cutting insert disposed in each such seat, each such insert having a cutting edge spaced from said seat, each insert having a first surface portion disposed against said seat and a second surface portion opposite said first surface portion, and means for releasably locking each insert in its seat comprising a pair of spaced parallel grooves in the second surface portion of the insert, a pair of threaded holes in the cutter body each corresponding to a corresponding one of the insert grooves and each having its axis disposed in the same plane as and at an acute angle relative to the axis of the corresponding insert groove, and a pair of headed screws each having a threaded shank threaded into a corresponding one of the two threaded holes and a circular edge on the head of each screw whose projection is a convex elliptically contoured segment when viewed axially of the corresponding groove, each groove having a concave elliptical contour complementary to the projection of the circular edge of the screw head, the edge of each screw head, upon threading of each screw into its hole, engaging the corresponding groove, thereby locking the insert in the seat.
Dependencies are inferred from the claim text.