US1953529A - Automatic die - Google Patents

Description

April 1934- T-. BYs sinz El AL 1,953,529

AUTOMATIC DIE F iled Feb 25; 1930 e Sheets-Shet 1 if A 1/ J W J.

' April! 3, 119340 E. T. BY-SSHE ET AL 1,953,529

AUTOMATIC DIE Filed Feb. 25, 1950 6 Sheets-Sheet 2 April 3,1934, E. T. BYssHE ET AL 1,953,529

' AUTOMATIC DIE Fjiled Feb. 25, 1930 6 Sheets-Sheet 3 April 3, 1934. E. T. BYSSHE ET AL.

AUTOMATICDIE Filed Feb. 25, 1950 6 Sheets-Sheet 5 29 /2511 I I faial i WMM April 1934 E. T. BYSSHE El AL 1,953,529

AUTOMATIC DIE Filed Feb. 25, 1950 6 Sheets-Sheet 6 i nmmmmmnu Patented Apr. 3, 1934 PATEN r OFFICE AUTOMATIC DEE Ernest T. Bysslie and Robert R. Finn, Springfield,

Vt., assignors to Jones & Lamson Machine Company, Springfield, Vt., a corporation of Vermont Application February 25, 1930, Serial No. 431,498

13 Claims.

This invention relates to automatically opening dies and has for one of its objects to produce a die of this type which may be used satisfactorily where great accuracy in the finished work is required.

" adjustment.

A further object is to produce 'a die by which threads may be cut on the work very close to the face of the work-holding chuck or to shouldered portions of the work.

A further object is to produce such a die in which chasers of the tangent type and of substantial length may be used with a die of the relatively small diameter which can be successfully applied to screw cutting machines of stand ard dimensions and clearances already in use.

For securing great accuracy of work, especially with chasers oi the tangent type, the chasers are accurately ground to shape and are-adjustably carried in accurately ground holders movable in accurately fitting ways in the die, and the chasers are rigidly backed when in service and when released are released simultaneously at a plurality of positions spaced angularly about the axis of the die.

In order to permit the use oi chasers of the tangent type and yet permit the die to be of the necessary small diameter so as to be applicable to types of machines already in extensive use, the chasers are supported on the end face of the die, and by so mounting them it is possible for the chasers to cut close to a shoulder on the work or to the work-holding chuck.

This application is a continuation in part oi our application Serial No. 352,107, April 3, 1929,

' for Automatic dies.

For a more complete understanding of this invention reference may be had to the accompanying drawings in which Figure l is a side elevation of a die constructed according to this'invention.

Figure 2 is a front elevation partly in section of the same.

Figure 3 is similar to a portion of Figure L, but showing a modified micrometer form of chaser Figure 4 is a detail plan showing the adjust-i merit of Figure 3.

Figure 5 isa side elevation of the same.

Figure 5a is a fragmentary view partly broken away showing a further modification.

Figure 6 is a longitudinal section through the die on line 6-6 of Figure 1 showing the die closed.

Figure to is a view similar to the upper portion. of Figure 6, butshowing the die open.

Figure 7 is a section on'line 7-7 of Figure 6.

Figure 8 is a detail section on line d-t of Figure '7. y I

Figures 9, 10 and 11 are sections on lines 9--9, 10--10 and 11-11, respectively, of Figure 6.

Figure 12 is a view similar to Figure 10, Tout showing the parts in the die open position.

Figure 13 is a detail plan of the die, the outer casing being removed, the full line position show= ing the die closed and the dotted line position showing the die open.

Figures to to 21 are detail perspectives oi various parts of the 0116.

Figure 22 is a perspective of a tangent type chaser.

Figure is a view partly in elevation and partly in section shovnng a modified construction having an internal trip.

Figure 24 is a similar view showing a shoulder trip.

Figure 25 is a fragmentary view partly in tion and showing a modified form of external trip.

Figure 26 is a fragmentary front elevation partly in. section showing the construction oi Figure 25.

As shown in the drawings the die comprises a body member '1 shown detached in Figure 14. This member comprises a shank portion 2 and a head portion 3. The head portion 3 is provided with means at its forward face as for supporting the chasers with capability of movement toward and from the longitudinalaxis of the die. For this purpose intersecting radial dovetail slots 5 are shown as formed in this end face for the reception of chaser holders 6, one of which is shown detached in FigureZl. Each holder has a dovetail portion 7 slidably fitting one of the grooves 5. These cooperating parts, including the forward face of the head portion 3 and the mating rear face of the holders 6, should be ground and lapped accurately to form so that the die holders may be held accurately in proper position. There may be clearance at the root'of the portion 7. The re face 8 ofeach die holder rests squarely and inst the forward face portion' l of the body 1. er 1. Thus the chaser holder is accurately supported free from liability of rocking or. other play.

One side face of each holder is provided with adjusted position, the side'face 11 of the holder is shown as provided with a dovetail. slot 12 and In order to secure I of a locking and releasing plug 193.

the chaser 10 is provided with a mating dovetail portion 13. These portions and the confronting side face of the holder and the rear face of the chaser should also be ground and lapped accurately. There may be clearance at the root of the chaser dovetail, but it is important that the rear face of the chaser on both sides of the dovetail and particularly at the outer edge where the cutting teeth are positioned bear accurately fiat against the chaser holder; By this accurate engagement between the chasers and holders and between the holders and body portion, ac-' curacy of positioning of the chaser teeth may be maintained, possibility of tilting or other lost motion between the parts being reduced to the minimum. This is highly important and particularly so when the chasers 'are carried on the forward face of the die body where they may cut close to shouldered work. The rear edge face of the chaser slidably engages the forward face of the die body, and it is moved perpendicular to the axis of the body portion. Thus for any given number of chaser teeth the cutting teeth at the forward end of the ch'asers are at the minimum distance from the front face of the die body thus to keep to the minimum the effective lever arm tending to tilt the chaser away from the work by engagement of these cutting teeth therewith.

Any suitable means may be provided for fixing the chasers longitudinally relative to their holders. Three constructions for this purpose are illustrated in Figures 2 to Ed. The rear portion 15 of the chaser at the dovetail 13 is shown in Figurs 2 to 5 as provided'with ratchet serrations and fitting these serrations and slidable in an aperture 18 in a corresponding holder, in the construction shown in Figure 2, is a plug 19 having its outer end face 20 shaped to mate the serrations 15. As shown in Figure 2 this plug 19 is pressed into contact with the chaser as by means of a spring 21 seated in a socket in the rear end of the plug and reacting against the rear face 22 of a chamber 24 within which the plug 19 is slidably fitted. The plug 19 is laterally perforated as at 191 for the passage therethrough of a stem 192 The stem 192 is smaller than the perforation 191 but has a head 194 at its inner end having its opposite end faces beveled which is of a size to slidingly fit this I perforation. This head is also slidable into and out of a socket portion 195 in the chaser holder. The plug 193 has a threaded portion 196 engaging in'a mating threaded opening 197 in the chaser holder and has a head 198 which at its end may be providedwith a polygonal socket 199 to receive an actuating tool by which it may be turned. At

the inner end of the threaded portion is a circular shoulder 200 which may enter a counterbored portion 201 at the outer end of the plug passage. This shoulder is of sufliciently smaller diameter than the counterbore to permit the plug 19to adjust itself to the toothed face of the chaser, but the difference in size is too small to permit the plug to become disengaged therefrom. By unscrewing the plug 193, however, this shoulder is first withdrawn from the counterbore and the tapering rear end of the head 194 then engages the upper wall portion of the perforation 191 and wedges the plug .19 against the action of the spring 21 out of engagement with the chaser whereupon the chaser can be removed. The tapering front end of the head 198 exerts a similarreleasing action on insertion of the plug 193 after it has been removed for any reason.

The serrations 15 of the chase may act a a rier.

gage in the sharpening operation, at each grinding operation the amount of stock removed being equal to the space between adjacent serrations. The chasers can then be returned to position in the die with assurance that the cutting edges will be in the same relation to the work as before the sharpening the chaser being moved inwardly the definite increment of one tooth further than its position before sharpening.

In Figures 3, 4 and-5 a modification is shown in which a micrometer adjustment of the chaser can be effected. As there shown the plug 190 is provided with a slot 25 at one side within which normally extends the inner end of a latch plug 26 which is removably held seated in a perforation 2'? through a wall of the holder 6 as by means of a split spring ring 270 positioned in a portion 28 of reduced diameter in the plug 26 and engaging the wall of the perforation 27: This plug 190 is slidably mounted in a carrier 30 axially rotatable in the holder 6, the plug 19 being eccentrically mounted relative to the axis of this carrier which can be turned as by means of a suitable implement inserted in a polygonal socket 31 in its outer end. By such rotation the plug 19 is moved with a component of motion lengthwise of the chaser thus to move the chaser lengthwise. The plug carrier 30 may be provided with a spring latch to retain it yieldably in any one of a plurality of adjusted angular positions, which, as shown comprises a plug 35 having a pointed end 36 pressed toward the periphery of the member 30 by a spring 3'? housed in a member 370 threaded in the chaser holder so' as to enter in any selected one of a series of peripheral recesses 38 therein brought op posite to this pointed end.

In Figure 5a another micrometer adjustment construction is shown. In this figure the chaser is shown as provided instead of the serrations 15 with spaced notches 42 defining transverse ribs 43. An annular shoulder 44 on an adjusting screw 45 may be engaged in any of these notches and this screw may then be screwed to the desired extent into athreaded socket 46 in the holder.

The screw 45 is shown as provided with a screwall! driver slot 47 at its outer end. It will be noted against the chaser, this all being taken care of by 1 the bearing of the chaser against the solid portion of the holder in contact therewith. Not only does this make for simpler and more rigid and accurate and stronger construction but it also avoids warping or other distortion of the chasers and holders occasioned by pressure of clamping elements thereon.

From an inspection of Figure 6 it will be seen that the outer edge 40 of the chaser is substantially in the same plane as the outer face 41 of its car- Thus it is able to approach shoulders on work to be threaded or the chuck for carrying the work as close as the chaser holder may be made to approach it.

The chasers are designed to be moved inwardly toward the axis of the die to closed position or to be moved outwardly to open position, all the chasers being moved simultaneously by a cam member 50 shown detached in Figure 15. This cam member has a central bore 51 which is slidable on the shank portion 2 of the body member immediately back of the head 3 and it is provided with cam extension portions 52 shown as of substantially rectangular cross section which are inclined outwardly from the axis of the die torot ward their free ends. These extension elements 52 pass through slots 54 in the head 3 being clear therefrom and into inclined openings 55 through the chaser holders with which they have bearing, each of these openings 55, there being one for each chaser holder fitting closely'the cam extensions 52. It will be noted that the elements 52 are one piece with the remainder of the cam member 'so that they are rigid therewith. When the cam member 50 is moved forwardly toward the head 3 these cam extensions passing into the openings cause the chaser holders to move inwardly across the Figure 6. When the cam member 50 is moved rearwardly from the head 3, as shown in Figure 6a the engagement of the chaser holders on these cam extensions causes the holders to be moved outwardly to die open position as shown in Figure Means are provided tending to hold the cam 50 in its rearward position relative to the head 3 so as to hold the chasers in open position. As shown best in Figure 8 this means comprises'springs' 60 seated in oppositely disposed sockets 61 and 62 in the rear face of the head 3 and the forward face of the cam member 50.

Means are provided, however, for holding the cam member in its forward position so that the chasers may be held closed, such means being releasable to permit the springs 60 to open the die. Such holding means as shown comprise spaced segmental extensions 65 on the rear face of the cam member 56 spaced inwardly from a rearwardly extending outer rim portion 66. Cooperating with these segments 65 are segments v'70 of a locking ring 71 shown detached in Figure 16. These segments are so spaced that the segments 65 may pass therebetween when the member 50 and the ring 71 are properly angularly related and when the cam member is in die closed position, permitting the cam to be moved to die open position, as shown in Figures 6a. and 12. In

normal die closed position these segments are out of such angular position, the segments 76 partially overlapping the segments 65 so that the cam member 50 is prevented from moving rearwardly, as shown in Figures 6 and 10. Four each of segments 65 and 70 are shown, these engaging portions being chaser holders in closed position, but in any event at least three should be used to prevent possibility of tilting of the cam member which would throw the chasers off center. This permits the use of a cam member of such short axial engagement with the member 2 that its bearing lengthwise thereon would not be sumcient to prevent tilting were it held against opening movement atone side only of the axis of the shank portion 2. This permits substantial shortening of thedie without sacrifice of accuracy. By the use of multiple loching members which are released simultaneously, the wear of the locking parts is minimized, thus prolonging the effective life of the die. The ring '11 is rockable on the shank 2 on a portion 73 back of the cam member, 50 and against a shoulder -72 thereon and is held against rearward motion by means of a ring member 75 of annular cross section which in turn is held in proper position by end face 4 of the head into closed position as shown in The segments 70 of the ring 71 extend outwardly radially further than the segments 65 of the cam member 50 and these extension end portions are formed with inclined cam faces 80 with which cooperate inclined faces 81 of a releasing sleeve 85 shown detached in Figure 19. This sleeve 85 is axially slidable onthe outer face of the nut member Z6, this member having an annularshoulder portion 86 at its rear end which forms a stop limiting the rearward sliding of the member 85. The member 85 is cut away as at 90 adjacent to each cam surface 81 to permit the extensions 80 of the segments 70 of the locking ring 71 to pass freely and to permit this ring to rock between locking and releasing positions. The outer face of the member 85 is formed to receive with a press fit thereon an outer sleeve member 95. This member is shown as provided with. a peripheral groove 96 with which may be engaged any of the usual releasing yokes (not shown) employed to stop the advance of the releasing sleeve as the die continues to move lengthwise of the work thus to effect the releasing and resultant opening of the die. The members and 85 operate together as a unit and are made of separate pieces for ease in manufacture, particularly to facilitate the formation of the cut away portions 96 and the cam faces 81 with which the cam extensions 80 of the locking ring cooperate.

When the surfaces 80 and 81 are in contact as shown in Figure lathe locking ring is so angularly, related to the cam member 50 as to bring its segments '20 in slightly overlapping relation to the segments 65 of the cam 50. By drawing rearwardly on the sleeve 96 relative to the body portion 1, however, the cam faces 81 acting against the cam faces 86 cause rotation of the ring member until the segments 70 come opposite to the spaces between the segments 65, releasing all the segments 65 simultaneously, whereupon the springs 61 force the cam member 56 rearwardly and open the die. When the member 95 is moved forwardly an internal shoulder portion 98 thereon engages the end portion of the rim 66 of the cam member 50, continued motion forcing the cam member forwardly and thus closing the die. As soon as this has been done sufficiently for the segments 65 to clear the segments 76 the ring member 71 is rotated angularly to its locking position by means of a spring pressed plunger 160 seated in a socket 101 of one of the segments '70 and engaging an edge portion 102 at one of the openings 96 of the releasing member 65. The forward end of the member 85 is provided with a peripheral groove 105 within which is positioned a ring member 106, the outer face of which rides within the rim 66 of the cam member 50,- and the. release member 95 is provided with a forwardly extending annular housing 126 within which the rear end portion of the cam 50 rides, thus to prevent the entry of chips or other foreign matter to the interior of the mechanism about the locking ring. The member '25 is provided with a keywa y' 116 for the reception of a key plug 111 projecting outwardly from the shank portion 2 of the body member, thus to hold this ring member '75 against rotation relative thereto while permitting it to be adjusted axially of the body by rotation of the adjusting nut 76. The position of the flange 86 of this adjusting nut determines the maximum opening the cam 50.

of the die since it limits the rearward motion of the cam member. This nut may be held in adjusted position by means of the set screw 115. The member 75 is also keyed to the sleeve 85 as by the key 112 seated in a socket 113 in the member 75. The cam member 50 is held from angular motion relatively to the body member by engagement of the cam extension 52 in the head openings.

54. In Figure 16 the locking ring is shown as provided with a keyway 116. This, however, has no function in the operation of the die, but is put in merely to aid in assembly.

In Figures 23 to 26 slightly modified constructions are shown, the modifications residing in the mechanism for turning the locking ring to release In Figure 23 this release mechanism is actuated by the Work 150, the end of which engages an adjustable stop 151 threaded into a plug 152 slidable Within the shank portion 2 of the body member. This shank portion is shown as provided with oppositely disposed longitudinal slots 153 through which extends a rod 154, this rod being carried by the plug 152. Opposite ends of the rod 154 have fixed thereto fingers 155 having hooked portions 156 which engage over the flange 157 of the member 95. Thus as the chasers run up onto the work the end of the work contacts the end of the stop 151, whereupon further relative motion endwise between the work and the die causes the plug 152 to be-moved rearwardly, moving the release member 95 to release thecam 50.

In Figure 24 the work 160 is shown as provided with a shoulder portion 161, which when the work has been threaded to the desired extent, engages against the end of a plug 162 which rides in the shank portion 2 of the body member, this plug 162 being connected through the bar 154 and fingers 155' to the member 95 in the same manner as the member 154 is shown in Figure 23.

In Figures 25 and 26 are shown external release mechanism in which an annular member 170 is substituted for the members 85 and 95 in the construction shown in the other Figures of the drawings, this member 170 being keyed to the members as by the key 171. At 172 is shown a locking ring similar to the ring 71 heretofore described, except that it is provided with a cam follower portion 173 with which cooperates a cam member 174 pivoted at 175 to the member 170. This cam member 174 has a cam face 176 acting on the follower 173 and an actuating projection 177 which extends outwardly of the periphery of the member 170. This member 177 is designed to impinge upon a suitable fixed part of the machine when the threading has been carried to the desired extent, thus depressing the cam member 174, causing its cam face 176 acting on the follower portion 173, to rock the locking ring to released position.

From the foregoing description of certain embodiments of this invention having thus been described it should be evident to those skilled in the art that various changes and modifications might be made without departing from the spirit or scope of this invention as defined by the appended claims.

We claim:

1. A die comprising a body portion, holders radially movable on an end face of said body portion, and a chaser of the tangent type carried by each of said holders and adjustable relative to its holder at an angle to the line of motion thereof relative to saidbody portion, said chaser being radial grooves in one end face, a holder for each groove having a tongue riding therein, and a tangent chaser for each holder, each said holder having a tongue and groove connection on one side face with its chaser and the back face of each chaser back of its cutting teeth bearing directly against its holder and one face of said chaser lying in slidable engagement with a face of said body portion.

4. A die having a body portion, chasers carried thereby and relatively movable to open and closed positions, a member movable axially of said body portion to move said chasers positively to open or closed positions, means tending to move said member to chaser open position, said member having at least three spaced segments, a locking ring having spaced segments normally overlapping the segments of said member and preventing movement of said member to open position, and means actuable to rock said ring to bring its segments opposite to the spaces between said member segments to permit said-member to be moved to open position and engageable with and actuable to move said member to closed position.

5. A die having a body portion, chasers carried thereby and relatively movable to open and closed positions, a member movable axially of said body portion to move said chasers positively to open or closed positions, means tending to move said member to chaser open position, said member having at least three spaced segments, a locking ring having spaced segments normally overlapping the segments of said member and preventing movement of said member to open position and means movable axially of said body in one direction to rock said ring to bring its segments opposite to the spaces between said member segments to permit said member to be moved to open position and in the opposite direction to move said member to closed position.

6. A die having a body portion, chasers carried thereby and relatively movable to open and closed positions, a member movable axially of said body portion to move said chasers positively to open or closed positions, means tending to move said member to chaser open position,:said member having at least three spaced segments, a. locking ring having spaced segments normally overlapping the segments of said member and preventing movement of said member to open position, and means movable axially in said body in one direction to rock said ring to bring its segments opposite to the spaces between said member segments to permitsa'id member to be moved to open position, said means having operative connections to said member to cause movement of said means in the opposite direction to move said member to chaser closed position.

7. A die having a body portion, chasers carried thereby and relatively movable to open and closed positions, a member movable axially of said body portion and controlling the relative to the axis of said body, and a lock releasing member movable axially of said body and having mating inclined faces acting on axial motion thereof in one direction to engage said ring segment faces and rock said ring to bring its segments opposite to the spaces between said member segments to thereby permit-said member to move to chaser open position.

8. A die having a body portion, chasers carried thereby and relatively movable to open and closed positions, a member movable axially of said body portion and controlling the relative positions of said chasers, means tending to move said member to chaser open position, said member having at least three spaced segments thereon, a locking ring having spaced segments normally overlapping said member segments and holding said member in chaser closed position, said ring segments each having a face inclined to the axis of said body, and a lock-releasing member movable axially of said body and having mating inclined faces acting on axial motion thereof in one direction to engage said ring segment feces and rock said ring to bring its segments opposite to the spaces between said member segments to thereby permit said member to move to chaser open position, and means tending to hold said ring in looking position.

9. A die having a body portion, chasers carried thereby and relatively movable to open and closed positions, a member movable axially of said body portion and controlling the relative positions of said chasers, means tending to move said member to chaser open position, said member having at least three spaced segments thereon, a locking ring having spaced segments normally overlapping said member segments and holding said member in chaser closed position, said ring having a face inclined to the axis of said body, and a lock releasing member movable axially of said body and having a mating inclined face acting on axial motion thereof in one direction to engage said ring face and rock said ring to bring its segments opposite to the spaces between said member segments to thereby permit said member to move to chaser open position, said releasing member having a portion engageable with said chaser controlling member to move said controlling member to chaser closed position on movement of said releasing member in the opposite direction.

10. A die having a body portion, chasers carried thereby and relatively movable to open and closed positions, a member movable axially of said body portion and controlling the relative positions of said chasers, means tending to move said member to chaser open position, said member having spaced segments thereon, a locking ring having spaced segments normally overlapping said member segments and holding said member in chaser closed position, said ring segments each having a face inclined to the axis of said body, and a lock releasing member movable axially of said body and having mating inclined faces acting on axial motion thereof in one direction to engage said ring segment faces and rock said ring to bring its segments opposite to the spaces between said member segments to thereby permit said member to move to chaser-open position, and a member positioned in the path of work operatively connected to said releasing member whereby to open said chasers when the work has been threaded to a predetermined point.

11. A die having a body portion, chasers carried thereby and relatively movable to open and closed positions, a member movable axially of said body portion and controlling the relative positions of said chasers, means tending to move said member to chaser open position, said member having at least three spaced segments thereon, a locking ring having spaced segments normally overlapping said member segments and holding said member in chaser closed position, said ring segments each having a face inclined to the axis of said body, and a lock releasing member movable axially of said body and having mating inclined faces acting on axial motion thereof in one direction to engage said ring segment faces and rock said ring to bring its segments opposite to'the spaces between said member segments to thereby permit said member to move to chaser open position, said releasing member having a portion engageable with said chaser controlling member to move said controlling member to chaser closed position on movement of said releasing member in the opposite direction.

12. A die having a body portion, chasers mounted for motion from and toward the axis of said body portion to open and close said die, a member movable axially of said die and having operative connections to said chasers for positively opening and closing said die on axial movement of said member, means tending to move said member to die open position, means for preventing such movement, and an element movable axially of said die for rendering said preventing means inoperative by movement in one direction and for moving said member to die closed position by movement in the opposite direction.

13. A die having a body portion having a head at one end, chasers carried on the end of said head for movement toward and from the axis of said body to die closed and open positions, a member movable axially of'said body portion and having operative connections to said chasers whereby axial movement of said member away from said head moves said chasers to open position and movement toward said head moves said chasers toward closed position, said member having spaced segments on a face remote from said head, a locking ring journaled on said body por- 'tion and having spaced segments normally overlapping said member segments and preventing movement of said member to open position, spring means tending to move said member to open position, means for holding said ring against axial movement, said ring segments having extensions provided with inclined faces, a sleeve movable axially of said body portion and having inclined faces mating said ring segment inclined faces to turn said ring into position to permit said member segments to pass between said ring segments as said sleeve is moved away from said head, means for preventing relative rotation between said body portion and sleeve, and means for yieldingly holding said ring in angular locking position, said sleeve having a portion engaging said member to move said member to closed position on movement of said sleeve toward said head sufficiently to permit return of said ring to locking position.

ERNEST T. BYSSI-IE. ROBEBT R. FINN.

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