US1487855A - Die and die holder - Google Patents

Description

March 25 z 1924.

l487,855 L. B. HASBROUCK DIE AND DIE HOLDER Filed Jan' 24. 1921 20 J 2 @Z 303/ //g 43 .4 4,

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SWUQ/wtoz fr@ www @33 M @awww Patented lidar. 25, wget LGUIS B. EASBRO'UCK, OF ELMIR-A, NEW YO RK, ASSIGNOR OFiO-NE-HALF TO HENRY E.

VAN NESS, OF ELMIRA, NEW YORK.

DIE AND DIE HOLDER.

Application filed January 24, 1921. Serial No. 439,514.

T all whom t may concern:

Be it lrnown that l, Louis B. l-lasnnonon, a citizen of the United States, residing at Elmira, in the county of Ghemung and State of New York, have invented certain new and useful Improvements in Dies and Die Holders, fully described and represented in the following specification and the accompanying drawings7 forming a part of the same. This invention relates to dies and die holders and has for an object to provide means for cutting a screw thread with great accuracy, and for a further-object to facilitate the adjustment of the die to determine'the depth of the thread cut.

According to the invention, a firm support is provided for the front or outer end of the cutting die by arranging the die holder so that it completely surrounds the periphery of the die at the front end of the die and adords means for expanding the die so as to force its edge into firm contact with the holder.A The die and die holder are provided with corresponding conical surfaces au which are capable of relative longitudinal adjustment. The means for expanding the die serves to force its conical surface into firm contact with the conical surface of the holder in any of the various longitudinal to relations of these surfaces. The extent of the expansion necessary to obtain such con tact depends upon the relative longitudinal position of the conical surfaces, and consequently the diameter to which the die is expanded may be accurately adjusted by longitudinal adjustment of the conical surfaces.

The firm support provided for the front or outer end of the die not only serves to guide the die accurately upon the work, but serves also to correct any distortion in the die which may be caused by the heat treatment to which it must be subjected to harden it. Furthermore, the nieans for adjusting the die facilitates fine regulation of the depth of the thread cut.

@ther objects and advantages of the invention are hereinafter pointed out in connection with a detailed description of the specific embodiment of the invention which is illustrated in the accompanying drawings, in which Fig. 1 is a central longitudinal section of the die and die holder; and

Fig. 2 is a front end View of the die and die holder.

The die 1 is formed of a single piece of metal and is provided at its inner periphery with the usual cutting means for forming screw threads. The rear end 2 of the die 1 is perpendicular to the axis of the die, that is to say, to the a-Xis of the cutting teeth of the die. The front end 3 of the die is preferably also perpendicular to the axis of the die. Upon the edge of the die is formed a conical surface 4 tapering outwardly from the front edge 3 of the die. ln order to permit the reversal of the die in the holder it is desirable also to form upon the edge of the die a second cnical surface 5 tapering outwardly from the end 2 of the die. The die contains a longitudinal slot 6 eX- tending its entire length. This slot tapers inwardly, but its transverse cross-section is uniform, that is to say, the sides of the slot lie in planes containing the axis of the die or planes parallel to the axis. l

The die holder comprises the body 10 having at its forward end an abutment surface 11 perpendicular to its axis, and the hood 2O mounted upon the body and extending forwardly from the abutment surface 11 of the body 10. The hood 2O has at its forward end an internal conical surface 21. Means are provided for varying the longitudinal position of the hood upon the body and thus varying the distance between the abutment surface 11 and the conical surface 21. ln the form shown in the drawings, this adjustment is obtained by a threaded engagement between the hood and the body. For a purpose hereinafter explained, the

thread upon the body 10 is cut in the saine l direction as the thread to be cut by the die 1. A lock nut 12 may be screwed upon the body to retain the hood 20 in position after it has been adjusted.

rPhe die 1 is placed in the die holder between the conical surface 21 of the hood 20 and the abutment surface 11 of the body 10. A wedge 30 is provided for expanding the die. In the form shown, this wedge comprises a pin having a threaded portion 31 engaging a tapped hole 32 in the hood ifi and a tapered portion 33 extending into the slot G of the die l. As the wedge is screwed in, its tapered portion 33 expands the die, forcing the conical surface il of the die into close contact with the conical surface 2l of the hood 2O.A rllhis centers the die in the holder and serves to correct any distortion in the die. Furthermore, a lirin support is thus afforded for the outer end of the die, and this serves to guide the die accurately upon the work. The contact of the rear end of the die with the abutment surface ll of the body brings the axis of the dieV in line with the airis of' the holder.

l/Vhen it is desired to adjust the die, that is to say, slightly to change its diameter so as torvary the depth of the thread eut, the wedge 30 is loosened and the distance between the conical surface 2l of the hood 20 and the abutment surface 1l of the body l0 is varied by screwingl the hood 20 inwardly or outwardly upon the body l0. rihe hood 20 is retained in adjusted position by screwing the lock nut l2 against it. ll-he wedge 30 is then screwed in until it forces the conical surface 4 of the die l into firm contact with the conical surface 2l of the hood 20, in the new position of the parts. lt is apparent that, in making` adjustments, if the hood 2O is screwed outwardly upon the body 10, the resu'ft of expanding the die until the conical surfaces are forced into Contact will be to increase the diameter of the die and diminish the depth of the thread cut. Conversely, if the hood 20 is screwed inwardly, less expansion of the die will be necessary to force the conical surfaces together so that a deeper thread will be cut. Thus, minute adjustments in the depth of the thread may be made easily and quickly. Furthermore, when the proper adjustment has been secured it may be retained since the die is firmly locked in position by the wedge ln addition7 the lock nut 12 serves to prevent any turning,v of the hood 2O uponthe body 10.

ln order to provide convenient means for mounting' the die holder in lathe, a drillpress, or any other means adapted to rotate it, the body l0 ofthe die holder is mounted upon ahollow shank 40. The body 10 has at its rear end a flange 4l which fits around kthe periphery of a shoulder 42 at the outer end of the shank 4:0. The body 10 is secured to the shank by rue-ans of ay nut- 4-3 which is screwed upon the body and has a flange 44 engaging' the rear surface of the shoulder 4:2. To facilitate the attachment of the die holder 'to the shank L10, the body l0 is provided with a hollow stud 45 which is inserted in the interior of the shank 40 when the die holder is applied to the shank.

Any suitable means may be used for trans- .-ferrine the torque of the shank 40 to the body l0. As shown in the drawings the intense means for this purpose comprise pins et extending from the outer end of the shank and pins t? extending from the inner end of the body 10, and a driving disc- 48 having holes into which the pins 46, 47 extend.

il positive driving connection is provided between the body l0 which is turned by the shank #l0 and the die il. As the threads conne-tingthe hood 9,0 to the body 10 are cut in the same direction as the thread to be cut by the die l, the turning movement of the bodylO tends to screw the hood '2O further upon the body; but, as inward movement of the hood with respect to the bddy is prevented by the engagement of the hood and body with the die l well as by the lock nut l2, the turning movement of the body is transferred to the hood without slippage. The wedge SO'pr-events the die l from turningin the hood 20. It follows that the turningl movement of the shank 40 is trans- `mittedto the die l without slippage.

In addition to the advantages hereinbcfore pointed out it is apparent that the device described is of simple construction and is in consequence economical to manufacture. Furthermore, the Vabsence of all slippage and the firm support provided for the die, and particularly for its front end, have proved in practice to `rive the device a hie-h degree of durability. Y

It should be clearly understood that the invention is by no means limited to the specific form and arrangement of parts described.

lVhat is claimed is:

l. The combination of a one-piece die in the form of a split annulus of substantially uniform width and having an externa-l conical surface, a die holder having an internal conical surface. and means for expandingJ the die so as to force its conical surface uniformly into contact with the conical surface of the die holder.

2. The combination of a die of annular form having a surface of revolution at its outer edge and spaced sets of cutting teeth on its inner edge and recesses extending` radially outward between said sets of cutting' teeth, each of said recesses terminating at substantially the same distance from the outer periphery of the die, and a` slot eX- tending from the end of one of said recesses to the outer periphery of the die, a die holder havinga surface of revolution adapted to engage the edge of the die completely around its periphery, and a wedge adapted to enter the slot in the die and to expand the die so as to force its outer edge uniformly against said surface of the die holder.

3. The combination of a die of annular form having a conical surface at its outer edge and spaced sets of cuttingr teeth on its inner edge and recesses extending radially lid i the rear end of the die;

outward between said sets of cutting teeth, each of said recesses terminating at substantially the same distance from the outer periphery of the die, and slot extending from the end of one of said recesses to the outer periphery of the die; a die holder having a conical surfaceformed to engage the edge of the die near its front end and providing an abutment adapted to engage and a wedge adapted to enter the slot in the die and expand `the die so as to force its outer edge uniformly against the conical surface of the die i holder.

le Ein adjustable and reversible one-piece die in the form of a split annulus of substantially uniform width having, at its opposite ends, surfaces perpendicular` to its axis; at its outer edge, conical surfaces tapering outwardly from each of its ends; and, at its inner edge, spaced inward projections provided with cutting teeth.

5. The combination of a reversible die containing a slot and having at each of its ends surfaces perpendicular to its anis and having its edge formed to provide conical surfaces tapering outwardly from each of its ends; a die holder having an abutment surface perpendicular to its asis adapted to engage either end of the die and a conical surface in front of said abutment surface and tapering outwardly toward said abutment surface adapted to engage either conical surface of the die; and a wedge extending into the die in a direction toward the conical surface of the die holder and adapted to expand the die and force it into contact with the conical surface of the die holder.

5. The combination of a reversible die containing a slot and having at each of its ends surfaces perpendicular to its anis and having its edge formed to provide conical surfaces tapering outwardly from each of its ends; a die holder having an abutmentv surface perpendicular to its axis adapted to engage either end of the die and a conical surface in front of said abutment surface and tapering outwardly toward said abutment surface adapted to engage either conical surface of the die; and a radial wedge adapted to enter the slot inthe die to enpand the die so as to force the die against the conical surface and the abutment surface of the die holder.

7. The combination of a die holder having a longitudinal shank, a body mounted on one end of said shank and adapted to be rotated thereby, said body having a plane surface extending completely across its outer end and lying perpendicular to the airis of the shank, and a hood mounted upon said body extending forwardly from said plane surface and having on its extending portion an internal conical surface; and a die havg an external conical surface adapted to i gage the conical surface of the hood and a rear surface perpendicular to its anis a 1apted to engage the plane surface of the body.

8. The combination of a die holder having'a longitudinal shank, a body mounted on one end of said shanlr, a driving connection between said shank and body, and a hood mounted upon said body so as to be adjustable longitudinally of the body and so as to be rotated by the rotation of the body, said hood having at its outer end an internal conical surface; die containing a slot and having an external conical surface adapted to engage the conical surface of the hood; and a pin mounted on said hood and extending into the slot of said die adapted to expand the die and to form a driving connection between the hood and the die.

9. The combination of a die holder, comprising a rotatable body having a plane abutment surface extending completely across its outer end, a hood having a threaded connection with said body and en tending forwardly from said abutment surface and having at its outer end a tapering engaging surface, means for rotating said body in a direction tending to cause said body to screw into said hood so as to bring its abutment surface nea-rer said tapering surface, and a die formed to extend between said tapering surface and said abutment surface and serving by engagement with said surfaces to prevent inward movement of the body in the hood so that the rotation of the body is transferred to the' hood and die.

10. The combination of a one-piece die having an external conical surface and containing an inwardly tapering longitudinal slot of uniform transverse section, a die holder having an internal conical surface., means for varying the relative longitudinal position of said conical surfaces, and a wedge having a threaded connection with the die holder and a tapering portion entendinq radially into the slot in the die and adapted to expand the die uniformly so as to force its conical surface into uniform contact with the conical surface of the die holder in various di'erent longitudinal re lations of these surfaces.

il. The combination of die holder having a body providing an abutment surface perpendicular to the axis of the die holder, a hood mounted upon said body, extending forwardly from said abutment surface and having on its extending portion an internal conical surface, means for adjusting said hood longitudinally of said body so as to vary the distance between the abutment surface and the conical surface, a die containing a slot and having an externa-l conical surface adapted to engage the conical surill) ias

face of the hood, and a rear surface perpendicular to its axis adapted to engage the abutment surface of the body, and a wedge extending through the hood into the die and adapted to expand the die so as to ioroe its conical surface into contact with the conical surface of the hood.

12. The combination of a die holder having a body providing an abutment surface perpendicular to the axis of the die holder, a hood having a threaded engagement with the body extending forwardly from said abutment surface and having on its extending portion an internal conical surface, a die containing an inwardly tapering longitudinal slot and having an external conical surface adapted to engage the conical aur-1 face of the hood and a rear surface perpendicular to its axis adapted to engage the abutment of the body, and a wedge positioned radially of the die and die holder having a threaded connection with the hood and a tapered portion adapted to enter the slot in the die.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

LOUlS B. HASBROUCK.

'Witnessesz J. C. FERGUSON, H. E. VAN Nissa.

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