US2119984A - Chaser-holder for thread-cutting tools - Google Patents

Description

June 7, 1938 A. F. B|'E|TF.x\1sTEn-ll l CHSER HOLDER4 FOR THREAD CUTTING TOOLS 2 Sheets-Sheet l Filed June 7, 1937 June 7, 1938. l A. F. BRElTl-:NsTElN CHASER HOLDER FOR THREAD CUTTING TOOLSh Filed June 7, 1937 2 Sheets-Sheet 2 Patented June 7, 1938 UNITE-D STATES PATENT OFFICE Albert F. Breitenstein,

New Haven, Conn., as-

signor to The Geometric Tool Company, New Haven, Conn., a corporation of Connecticut Application June 7, 1937, Serial No. 146,765

14 Claims.

This invention relates to improvement in Chaser-holders for mounting thread-cutting chasers in thread-cutting tools, such, for instance, as in self-opening die-heads.

One of the objects of the present invention is to provi-de a superior Chaser-holder by means of which the thread-cutting capacity of a threadcutting tool may be conveniently altered.

A further object is to provide chaser-holding means whereby a self-opening die-head or the like may be utilized for cutting a wide range of thread diameters without requiring the replacement of one Chaser-holder by another.

Another object is to provide a superior chaserholder of the character referred to whereby various thread diameters may be cut by employing in a given self-opening die-head or the like ychasers having substantiallythe same length.

A still further object is to provide a superior chaser-holder by means of which it will be neces'- sary to stock only chaser-blanks of substantially the same dimensions in order to cut a range of thread diameters with a given thread-cutting tool.

Still another object of the present invention is to provide superior Chaser-holding means Whereby, in Order to effect a change-over from cutting right-hand threads to cutting left-hand threads, or vice versa, it will not be necessary to replace an entire Chaser-holder. f

With the above and other objects in view, as Will appear to those skilled in the art from the present disclosure, this invention includes all features in the said disclosure which are novel over the prior art.

In the accompanying drawings, in which certain modes of carrying out the present invention are shown for illustrative purposes:

Fig. 1 is a view mainly in side elevation and 4o partly in section of a self-opening die-head equipped With Chaser-holders embodying the present invention; Y

Fig. 2 is a view thereof in front elevation Fig. 3 is a fragmentary sectional View taken on the line 3-3 of Fig. 2;

Fig. 4 is a similar view taken on the line 4 4 of Fig. 2;

Fig. 5 is a sectional view taken on the line 5 5 of Fig. 3;

Fig. 6 is a front-face View of one of Vthe-chaserholders, detached, and showing a chaser mounted therein; Y

Fig. 7 is a perspective View of the base-member of the Chaser-holder, looking mainly toward `the 55 forward 4face thereof;

drawings a self-opening die-head having the forward face of its body provided With four (more or less) T-shaped guide-grooves 2|, each of which is adapted to receive and guide for reciprocation the T-shaped guide-tang 22 of a reciprocating base-member, generally designated by the numeral 23, and including, in addition to the l tang 22, just referred to, a forward sector-shaped plate-portion 24.

Inasmuch as each of the four body-members 23 corresponds to each other, a description of one thereof, together with its associated parts, will serve for all.

The outer end of each of the body-members 23 is formed with an inclined cam-surface 25 which is adap-ted .to be engaged by a similarly-inclined internal cam-surface 26 formed within the forward end of a ring-like operating-sleeve 2l. The said operating-sleeve encircles the body 23 of the die-head and is adapted to slide axially upon the same to control the radial movement of the Chaser-holder. moved forwardly it acts to force the various body-members 23 bodily inwardly and to maintain the same in such position. When the said Chaser-operating sleeve 2l' is moved rearwardly, each of the body-members 23 of the chaserholder and the parts carried thereby will be permitted to move radially outward into a retired position in a manner hereinafter described.

Each body-member 23 is urged outwardly by a pair of cup-shaped plungers 28-28 (Figs. 1, 3 and 4), each of which is adapted to reciprocate in a suitable substantially-radial bore 29 formed in the body 2D of the die-head structure directly back of the guide-groove 2l in .the latter. Each plunger 28 is urged outwardly by a helical spring 30 and engages with a thrust-pin 3|, two of which latter project rearwardly from each of the body-members 23.

When .the operating-sleeve 21 is zov The detailed character of the various die-heads l slight advancement or retirement of the basemembers 23 and the parts carried thereby, byV

means of an adjusting-nut 32 mounted upon the threaded portion 33 of the shank 34 of the diehead structure. Y

On each of the respective opposite sides of the tang 22the rear face 35 ofthe plate-portion 24 of the base-member 23 is adapted to ride upon the front face of the body 28 of the die-head structure as is particularly well shown in Figs.

1 and 4, Each base-member 23 is formed onA itsV forward face with a'substantiallywadial guidegroove 36 which is adapted to receive a substan- V tially-radial guide-rib 31 projecting from the rear Vzo V guide-rib 31V just above referred to is formed with a plurality of transverse locating-teeth 39 which are adapted to selectively intert with similar butforwardly-extending locating-teeth 48 formed uponthe forward face of the headportionv 4I; of a locating-stud. 42. The Ylocating-stud 42 just referred to is firmly seated in a forwardly-opening counter-board recess 43 formed in the base-member 23centrally of the groove 3B therein as particularly well shown in Figs. 4 and '7. The said locating-,stud is retained in place by an anchor- Aing-pin 44 extending therethrough and through the adjacent portion of the tang 22 of the basemember 23. Y'

The base-member 23 on each of the respective oppositeY sides of the radial groove 35VV therein is formed with a threaded bore 45/receiving the threaded shank of a clamping-screw generally designated by the reference'character 43 and having its outer end located in a counter-bored slot 41 in the chaser-mounting member 38 so as'thus arranged serve to rmlyrattach the chaser'.-

. Vmounting member 38 to the base-member 23 so that the guide-rib 31 is maintained in the guidet groove y38 tor'thus restrainthe member 38 from twisting` with Yrespect-to the member 23 in a Y plane parallel with thercoacting faces of the two Y spect to thebase-'member 23.

FormedV YinrthefirnnerY contracted edge' of the i chaser-mounting member 38 is a chaser-receiving notch 48 which .extends fromV front to ,rear

through the said member and'isrbounded by opl posed side walls 49-49 andbyan outer end wall 58. installed in the chaser-receiving notch-48 of the chaser-mounting member 38 Aifs a substan-V tially-rectangular chaser 5l having `thread-cut ting teeth 52 atitsY inner end and transversely piercedrby a passage 53 which is flared at VAone end to Aprovide a `conical V cam-surface 54. f Substantially in line with the passage` 53 through the chaser 5| the chaser-mounting member 38 '1S' formed, with a `t1 nrtd 1inte 55 ,inte 'which is The clamping-screws 46 alsoserve Y threaded the threaded shank 58 of a chaser-seat?V ing screw generally designated by the reference character 51 and including a polygonallysocketed head-portion 58 joined to the threaded shank 56 by a conical cam-surface 59. The head 58 of the screw 51 is located in a bore 55a in the wall of the member 38 opposite the threaded bore 55 and the cam-surface 59 of the said screw is adapted to engage with the conical cam-surface 54 in the chaser 5l toforce the said chaser out- Vwardly firmly into engagement with the end wall 50 of the notch 48 and into firm engagement with Athe opposite wall 49 of the said member (Fig. 5)..

The outer end of the chaser 5I opposite Vthe thread-cutting teeth52ris formed with a transverse notch 68 into which extends the flattened end of a stabilizing-stud 8| rigidly positioned'in a socket 62 opening through the end wall 59 of the notch 48 in the chaser-mounting member 38. The projecting flattened jend of the stabilizing'- studl 8| by projecting into the notch 88 in the chaser 5| serves to prevent the outer end of the chaser from being cocked forwardly under the stress developedV when the thread-cutting teeth 52 of the chaser are in action. i Y

In all of the gures preceding Fig. 6 the chasermounting member 38 is shown as adjusted to `the `be moved inwardly by i'lrst Yloosening the' clamping-bolts 46 sufficiently to permit the said mounting-members to be moved forwardly with respect to their complemental base-member 23 adistance lll.Y

suicient to disengage the locating-teeth 39 of Y IfY desired the radially inwardly relative to their respective base.'-

members 23 a distance corresponding to the spacing of the locating-teeth to thus provide inthe particular structure chosen'for illustration for the cuttingof threadsof1/2 diameter as shown inFig.6.v 'f Y 'f When the chaser-mounting members 38 have been moved the ,desiredV distance Y(within the yrange provided by the slotsY 41) the locating- teeth 39 and 43 are reengaged and the clamping-'screws 148 tightenedto re-lock the members 38 and 23 together'into a unit. vA suitable chaserl of substantially the .same over-all dimensions as the chaser 5| may now be'installed in the chaserreceiving notches 48 in place ofY the said chasers 5I, if desired.

As thus constructed and arranged, the two-part VVchaser-holders providefor increments of adjiist`l` lmentinr a `radial direction corresponding tothe spacing of locating- teeth 39 and 40 thereby making'it possible to employ'chaserfs of substantially the same length for cutting threads o'fvar'ious Y standard diameters without requiring 'thef replacement of the chaser-holders by 'other chaserholders. Furthermore byproviding chaser-holdv with a die-head equippedwith holders., ofthe present invention for cutting various thread diameters Within the range of the particular diehead. In the instance shown and described' the Chaser-holder provides for adjustments in increments of l" though greater or lesser increments may be provided for but in the event that it is desired to cut a thread diameter intermediate the increments referred to the Chaser-blanks may be ground back an appropriate amount. It may be here noted that in the usual manner of self-opening die-heads, the adjusting-nut 32 provides for adjusting the Chaser-holders asa whole within a limited range.

In addition to other advantages to chaserholders as above described, it may here be noted that in the event that it is desired to make a change-over from a set-up for cutting right-hand threads to a set-up for cutting left-hand threads or vice versa, it is necessary only to replace the Chaser-mounting members 38 and substitute in conjunction with the remaining base-members 23 a similar Chaser-mounting member having its Chaser-seating screw 51 extending therethrough in the opposite direction from that of the members 38.

The invention may be carried out in other specic ways than those herein set forth without departing from the spirit and essential characteristics of the invention, and the present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, and all changes coming within the meaning and equivalency range of the appended claims are intended to be embraced therein.

I claim:

1. A composite Chaser-holder for thread-cutting tools, comprising: a base-member having means thereon for intertting with a die-head; a complemental Chaser-carrying member carried by the said base-member with ycapacity for bodily rectilinearv adjustment with respect thereto, the division between the two said members being in a plane substantially parallel with the front face of the die-head structure; and lockingmeans extending between the two said members and binding the same into a unitary structure.

2. A composite chaser-holder for thread-cutting tools, comprising: a base-member having means thereon for interi'ltting with a die-head; a complemental Chaser-carrying member having an inwardly-opening Chaser-receiving socket and carried by the said base-member with capacity for bodily rectilinear adjustment with respect thereto, the division between the two said members being in a plane substantially parallel with the front face of the die-head structure; and locking-means extending between the two said members and binding the same into a unitary structure.

3. A composite Chaser-holder for thread-cutting tools, comprising: a base-member having means thereon for interftting with a die-head; a complemental Chaser-carrying member having an inwardly-opening chaser-receiving notch'and being carried by the said base-member with capacity for bodily rectilinear adjustment with respect thereto,Y the division between the two said members being in a plane substantially parallel with the front face of the die-head structure; and locking-means extending between the said members and binding the same into a unitary structure.

4. A composite Chaser-holder for thread-cutting tools, comprising: a base-member having means thereon for interltting with a die-head; a

'complemental chaser-carrying member having an inwardly-opening Chaser-receiving notch extending thereacross from its forward to its rear face, the said 'Chaser-carrying member being carried by the said base-member with capacity for bodily adjustment with respect thereto and having the rear terminus of its Chaser-receivingY wardly-projecting tang for intertting with a die-head and also having a locating-shoulder extending transversely with respect to the said tang for engagement with a locating-shoulder on the ysaid Chaser-carrying member, and the said chaser-carrying member having a Chaser-receiving seat and a locating-shoulder engageable with the locating-shoulder of the said base-member.

6. A Ycomposite Chaser-holder for thread-cutting tools, comprising: a base-member; a complemental Chaser-carrying member carried by the said base-member with capacity for bodily rectilinear adjustment withrespect thereto; and locking-means extending between the two said members and binding the same into a unitary structure; the said base-member having a rearwardlyprojecting tang for interiitting with a die-.head and also havingv a plurality of 1ocatingteetheX tending transversely with respect to the said tang for engagement with a plurality of locating-teeth on the said Chaser-carrying member; and the said Chaser-carrying member having a chaserreceiving seat and the plurality of locating-teeth engageable with the locating-teeth of the said base-member.

7. A composite chaser-holder for thread-cutting tools, comprising: a base-member having a rearwardly-projecting tang for interfitting with a die-head and also having a locating-shoulder extending transversely with respectk to the said tang for engagement with a locating-shoulder on the said Chaser-carrying member; a complemental Chaser-carrying member carried by the said base-member with capacity for bodily rectilinear adjustment with respect thereto and having a Chaser-receiving seat and a locating-shoulder engageable with the locating-shoulder of the said base-member; and locking-means extending between the two said members and binding the same into a unitary structure; the division between the two said members being in a plane substantially parallel with the front face of th die-head structure.

8. A composite Chaser-holder for thread-cutting tools, comprising: a base-member having a rearwardly-projecting tang for intertting with a die-head and also having a plurality of locating-teeth extending transversely with respect to the said tang for engagement with a plurality of locating-teeth on the said Chaser-carrying member; a complemental Chaser-carrying member carried b-y the said base-member with capacity for bodily rectilinear adjustment with respect thereto and having a Chaser-receiving seat and a plurality of locating-teeth engageable with the locating-teeth of the said base-member; and

Y member also of sector shape and carried by the locking-means extending between the two said members and binding the same into a unitary structure; the divisionbetween the two said members being in-a plane substantially parallel with l the front face of the die-head structure.

9. A composite; chaser-holder for thread-cutting tools, comprising: a base-member having a xed rearwardly-projecting tang rigid therewith for interrlttingv with adie-head and having a forward sector-shaped stabilizing portion extending laterally on each of the respective opposite sides of `the said tang and engageable with the forward face of Va die-head; a complemental Chaser-carrying member also of sector shape and carried by the said base-member with capacity for bodily rectilinear adjustmentrwith respect theretoj andelocking-means extending between the two said sector-shaped members on each -of the respective opposite sides of the tang of the said base-member and binding-the said members into a 'unitary structure. Y

10. A composite Chaser-holder for thread-cutting tools, comprising: aV-base-member having a xed rearwardly-projecting tang rigid therewith for intertting with adie-head and having a rforward sector-shaped stabilizing portion eX- tending laterally on each of the respective opposite sides rof the said tang and engageable with the forward face of aVdie-head; a complemental Chaser-carrying member carried bythe said basemember with capacity for adjustment with re-f spect thereto, the division between the* two said members being in; a plane substantially parrallel with the front face ofthe die-head structure; and locking-means extending between the two said members'on-l each of the respective oppo- `Von each ofthe respective opposite sides 'of/the' said tang and engageable with the forwardr face of a die-head; a. complemental chaser-carrying said base-member withY capacity for adjustment with respect thereto, the division between the Y two said sector-shaped members being in a plane substantially parallelV with the frontface of the i die-head structure; and locking-means extending Uvf,

betweenv the two said members on each of the l respective opposite sides of the tangof the said base-member and binding the said members into a unitary structure. Y n V12. A composite Chaser-holder forthread-cutlocated on the opposite sides of the said tang.

ting tools,'comprising`: Va base-member having a forwardly-projecting tang for interfitting with a die-head and also having a locating-shoulder ex- Y tending transversely with respect to said'tang for engagement with a locating-shoulder on the said Chaser-carrying member; a complemental chasercarrying member carriedby the said base-member with capacity for bodily rectilinear adjust-` ment with respect thereto and having a chaserreceiving seat and alocating-shoulder engageable with'the locating-shoulder of the said basemember; and a pair of locking-screws extending,

between the two said members and binding the same into Va unitary structure and respectively 13. A composite Chaser-holder for thread-cutting tools, comprising: a base-member havinga rearwardly-projecting tang for intertting with a die-head and having a forward sector-shaped Y portion extending laterally on each of the respective opposite sides of the said tang and engageableiwith the forwardV face of a die-head; aV complemental chaser-carrying'member also of sector shape Vand carried by the said base-member with capacityfor adjustment with respect thereto, the division between the two said sectorshaped members being in a plane substantially parallel with the front face of the die-head structure; and a pair "oflocking-serews respectively located on the opposite sides of the tang of the said base-member and extending betweenthe two said members to bindjthe same into a unitaryA structure, f f n 14. A composite Chaser-holder for thread-cutting tools, comprising: a base-member Vhaving a rearwardly-projecting tangfor interiitting with a die-head and having a forward sector-shaped portion extendingv laterally oneachV of theY re- Y spective opposite sidesH oi the said tang and formed in its Yforwardface with'a substantiallyradial locating-groove; a.l locating-stud having locating-teeth thereonV and mounted in the said base-member in position to have its locatingof; a complemental Chaser-carrying member also of sector shape and carried by the said baseteeth projectingl into the locating-'groove there- Y 15 member with capacity for adjustment with respect thereto and formedfon its inner face with a guide-rib formed with a plurality of locatingteeth andprojecting intothe locating-groove Vof the said base-member into engagement with the locating-teeth on the locating-stud therein; and

Y a pair of locking-screws one of which extends between the said sector-shaped members on each of the respective-opposite sides ofthe said guider groove and the said guide-rib thereof.

ALBERT 1r. BREITENSTEIN,

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