Патент USA US2410896код для вставки
NOV- 12, 1946. c. E. NORDSTROM 2,410,896 METAL CUTTING TOOL Filed Jan. 29, 1945 INVENTOR CARL E. NORDSTROM BY ATTORNEY Patented Nov. 12, 1946 2,410,895 UNITED STATES PATENT OFFICE 2,410,896 METAL CUTTING TOOL Carl E. Nordstrom, Evanston, Ill., assignor to Tele type Corporation, Chicago, 111., a corporation of Delaware Application January 29, 1945, Serial No. 575,137 1 Claim. 1 This invention relates to metal cutting tools and more particularly to burring or counterbor ing and countersinking devices. The principal object of the invention is to pro vide a metal cutting device for simplifying the execution of certain metal cutting operations. Another object of the invention is to provide a burring tool which comprises a retractable cut (01. 77-735) 2 A compression spring I 8 is positioned in the recess 13 and is seated in spring seats [9 and 2| in the shank II and element l4, respectively. In this manner, the spring [8 normally tends to eject the element I4 and. to maintain said ele ment M in its protruded position, as shown in Fig. 3. A collar 22 is adjustab-ly mounted on shank H by means of a set screw 23. Collar 22 ting element which is susceptible of being ejected is provided with a groove 24 joining its central by camming action automatically upon forcing 10 opening to receive the element l4. Collar 22 the tool into cutting position. thus restricts or limits the movement of blade Speci?cally, the burring tool comprising a M. The edge of element [4 is appropriately shank, cutting element, compression spring and curved at 25 to provide a camming surface. collar is clamped in a drill chuck or similar hold In the operation of the arrangement according ing device in a lathe or drill press. The piece part 16 to the invention, the pilot 26, forming the lower to be burred is held in a suitable ?xture and as the burring tool is piloted through the hole, end of the shank II, is caused to be projected through the hole to be burred. Then, as pres sure is applied to shank H to force the blade the edge of which is to be burred, the cutting element is held in retracted position by a spring, [4 further into the piece part [2, the blade l4, compressed between the cutting element and the 20 due to the camming action between shoulder 27 shank portion. Then, as pressure is applied to force the cutting element into the hole to be of the piece part [2 and curved portion 25 of blade M, will be cammed forward to the dotted burred, the cutting element, due to the camming position shown in Fig. 1, to countersink and action between the edge of the hole and a round “burr” the piece part l2 at 28. It is observed ed corner of the cutting element, will be cammed 25 that thev collar 22 is independently adjustable forward to countersink or counterbore the hole along the shank I l and not only restricts or limits in the piece part. With the device, according to the movement of blade l2, but also, it gauges the the present invention, countersinking or burring depth of countersinking as determined by its po operations which were heretofore inaccessible and sition on the shank I I. By advancing or adjust dllTlClllt of execution are rendered more readily 80 ing the collar 22 toward the end of the pilot 26, accessible. the aperture in the piece part I2 is countersunk The foregoing objects and features of the in to a lesser degree than if the collar 22 were vention will appear from the following detailed shifted or adjusted in the opposite direction. description taken in conjunction with the accom The device according to the invention facilitates panying drawing, in which 35 the burring of the inner sides of U-formed piece Fig. 1 is an elevational view of the arrange parts. ~ ment according to the present invention; The embodiment described herein is considered Fig. 2 is a top view of the device substantially to be illustrative and not restrictive, and accord as shown in Fig. 1, and ingly, all modi?cations are contemplated which Fig. 3 is a vertical sectional view taken approx 40 come within the spirit and scope of the appended imately on line 3-3 of Fig. 2. claim. Having reference to the drawing, a spindle or What is claimed is: shank H is adapted to be clamped in a drill In a burring tool, a rotatable cutter-carrying chuck (not shown) or similar holding device in member comprising a shank adapted to be in a lathe or drill press. A U-formed piece part l2 45 serted through a hole in the work, a retractable ' to be burred is held in a suitable ?xture (not cutter reciprocably mounted in a slot in said shown), appropriately placed on the table of the shank, said cutter provided with a cam contour, drill press. The shank H is recessed or slotted at It! to receive, slidably therein, a cutting ele a collar adjustably carried on said shank and grooved to receive said cutter in retracted posi ment or blade l4. Blade I4 is provided with a 50 tion, and spring means for yieldably retaining forwardly attending portion I 5 which terminates said cutter in said groove between said shank ‘ in a cutting edge l6, which portion extends and said collar, said spring means thereby nor through an aperture. IT in shank H which con mally acting to retract said cutter and urge it- ‘ nects with the recess l3. Of course, the projec- ‘ against said collar, whereby upon the coopera tion l5 may be round or square or of any geo 55 tion of said cam contour with said work when metrical conformation. Furthermore, the cut ting edge may be conformed or shaped to pro duce a countersink, or it may be shaped to pro duce a counterbore, if desired. the tool is forced into cutting position said cut ter is automatically ejected by the camming ac tion between said cam contour and said work. CARL E. NORDSTROM.