US2130119A - Positive acting circular chaser die - Google Patents

Description

Sept. 13, 1938. A. E. DRISSNER 2,130,119

POSITIVE ACTING CIRCULAR CHASER DIE Filed May 22, 1937 4 Sheets-Sheet 1 g Q @l.

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Sept. 13, 1938.

A. E. DRISSN ER POSITIVE ACTING CIRCULAR CHASER DIE Filed May 22, 1957 4 Sheets-Sfieet 2 Sept. 13, 1938. A. E. DRISSNER POSITIVE ACTING CIRCULAR CHASER DIE 4 Sheets-Sheet 3 Filed May 22, 1957 Wm m 0 N mm 7 w K m @w/ m l 1 |.v[il!ii V H. .WN [NW1 @N NH QNMVN MN mm Mw Sept. 13, 1938'.

IIIMIF A. E. DRISSNER 2,130,119

POSITIVE ACTING CIRCULAR CHASER DIE Filed May 22, 1957 4 Sheets-Sheet 4 I I I Patented Sept. 13, 1938 omen stares ATENT orFmE Alfred E. Drissner, Cleveland, Ohio, assignor to The National Acme Company, Cleveland, Ohio,

a corporation of Ohio Application May 22, 1937, Serial No. 144,228

20 Claims.

This invention relates to threading dies for use on automatic screw machines, the object of the invention being to provide an improved positive acting die in which the cutters or chasers are positively expanded or retracted in an eificient manner and which die is simple in construction and operation.

In the drawings accompanying and forming a part of this specification, Fig. 1 is a side View of this improved die.

Fig. 2 is a front end View thereof.

Fig. 3 is a longitudinal sectional view. 7

Fig. 4 is a section on line 4% of Fig. 3, looking in the direction of the arrows.

;; Fig. 5 is a perspective View of the cam holder with the cams removed.

Fig. 6 is a perspective view of one of the cams for use in the cam holder of Fig. 5.

Fig. 7 is a sectional view on line 'l! of Fig. 1,

looking in the direction of the arrows.

Fig. 8 is a longitudinal section on line 8-8 of Fig. 7, looking in the direction of the arrows.

Fig. 9 is a detail perspective view of the several parts of the die disassembled, and

25, Fig. 10 is a perspective view of a chaser block showing in dotted lines a circular chaser applied thereto.

Similar characters of reference indicate corresponding parts in the several views.

Before explaining in detail the present improvement and mode of operation thereof, I desire to have it understood that the invention is not limited to the details of construction and arrangement of parts illustrated in the accompanying drawings since the invention is capable of other embodiments, andthat the phraseology employed is for the purpose of description and not of limitation.

In the preferred form, this improved die comprises a die body 2 having an enlarged head 3 having radially extending slots A of T-shape therein for the reception of similarly formed chaser blocks 5 adapted to carry chasers 6 which are shown herein as of circular form. The die body has an extended bored shank l for attach- 'ment to suitable holding means of a screw machine, whereby the die is rotated.

Slidably carried on the body 2 is a hood 8 having an annular recess 9 in the periphery thereof for the reception of a yoke, not shown, carried by the machine whereby the hood is shifted back and forth. Within this hood 8 is an inwardly projecting annular cam I9 in position to cooperate with a pair of oppositely located segmentally formed shiftable cams l I (see Fig. 4)

' adjustment of this collar toward the chasers, the

having inclined cam faces l2 (see Fig. 6). These cams II are carried in opposed segmental recesses of an annular cam holder or carrier I3 located on the inner end of the shank l and within the hood 8. These cams are in position to be operated by the cam Ill as the hood is shifted back and forth and are held in projected position by suitable springs I4 (see Fig. 4) located in opposed faces of the cams and cam holder and in their projected position they engage the rear face of an annular sliding ring l5 carried on the cam holder l3 and in juxtaposition to the rear face of the head 3. This ring l5, upon the depression of the cams II, will be shifted rearwardly on the cam holder l3 by suitable springs 20 located in opposed faces of the ring l5 and die head 3.

This sliding ring I5 carries a series of longitudinally extending cam studs 16 secured to the ring by pins l6 and adapted to project through suitable openings IT in the head 3 and provided with tapered cams or keys [8 (see Fig. 9). Each of these keys l8 engages a similarly formed cam slot H9 in a chaser block 5 adapted to slide in the radial slot 4 of the head 3.

Threaded on the shank l is a collar 24 in position to engage the rear face of the cam holder l3 and hold the parts properly assembled and also effective to adjust the position of the cam holder !3. Adjustment of this collar 24 in either direction effects a like movement of this cam holder l3, cams ll ring I5, studs l6 and thereby, through the cams or keys l8, shifts the chaser blocks and their chasers inwardly or outwardly radially. By

chasers are adjusted to cut a smaller diameter of work. Suitable springs I3 co-operate with the cam holder l3 and rear face of the die body for holding the cam holder in engagement with the collar 24.

A retaining block 25 having an elongated slot 26 is suitably secured on this collar 24 by means of a screw and limits the backward movement of the ring i5 and its associated parts and prevents the keys l8 from riding beyond the slots 59 in the chaser blocks 5 and thus also prevents the blocks from falling out of the die. This retaining block 25 may be moved backward to permit the cams E8 to disengage the slots IQ of the blocks 5 when it is desired to remove the blocks for the insertion of new or reground chasers.

Suitably removably secured within the body 2 as by a bayonet joint 21 and projecting between the chasers is a work guide member 28 having projecting tines 29 extending between the chasers,

to prevent the work falling between the chasers when the die is in open position.

To insure the positive action of this die, elongated slots 2| (see Fig. 3) are provided in the hood 8 and through these slots suitable screws 22 project into the ring I5. When the hood 8 contacts these screws 22, the expanding action of the chasers is started if for any reason the springs 20 fail to do this Work. After the expanding action of the chasers is started, the springs will complete the expanding action as before described.

The operation of the die is as follows:

Just before the completion of the threading operation, the yoke carried by the machine andengaging the hood 8 in the annular recess 9 holds back the hood as the other parts of the die continue their forward travel. The annular cam III on the inside of the hood rides up the inclined surface I2 of the cams I I thereby depressing them within the cam holder I3 against the action of the springs I4. As these cams are pressed withinthe periphery of the holder I3, the locking action of the cams against the rear face of the ring I5 is released and the springs 20 acting against the die head 3 force the ring I5 to the ear and with it the cam rods I6 and due to the sliding action of the keys I8 in slots I9 of the blocks 5', the chasers are released form the work.

To reset the die, the spindle is moved backward until the yoke engaging in the groove 9 of the hood 8 is stopped. The body of the die continues to move back until the flanged face 23 of the hood contacts the rear face of the ring I5 thus holding this ring stationary and permitting the cams II to expand or project outward by means of the springs I4, thus locking the ring I5 in place.

It is to be understood that, by describing in detail herein any particular form, structure or arrangement, it is not intended to limit the invention beyond the terms of the several claim or the requirements of the prior art.

Having thus explained the nature of my said invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which itmay be made, or all of the modes of its use, I claim:

1. A threading die comprising a body, a. plurality of radially shiftable chasers and a carrier carried thereby, positive acting means for shifting the chasers and comprising a sliding member, means for locking said member, both of said means carried by the carrier, and a shiftable hood for controlling the operation of and directly engaging said locking means and effective to release the locking means by depression thereof.

2. A threading die comprising a body, a plurality of radially shiftable chasers and a cam carrier carried thereby, positive acting means for shifting the chasers and comprising a sliding member, means for locking said member and comprising a shiftable cam, both of said means carried by the cam carrier, and a shiftable hood for controlling the operation of and directly engaging said locking means and effective to release the locking means by depression thereof.

3. A threading die comprising a body, a plurality of radially shiftable chasers and a carrier carried thereby, positive acting means for shifting the chasers and comprising a sliding member, means for locking said member, both of said means carried by the carrier, a shiftable hood for controlling the operation of and directly engaging said locking means and effective to release the locking means by depression thereof, and means for adjusting the position of the locking means and thereby the diameter of the chasers.

4. A threading die comprising a body, a plurality of radially shiftable chasers and a cam carrier carried thereby, positive acting means for shifting the chasers and comprising a sliding member, means for locking said member and com prising a shiftable cam, both of said means carried by the cam carrier, a shiftable hood for controlling the operation of and directly engaging said locking means and effective to release the locking means by depression thereof, and means for adjusting the position of the locking means and thereby the diameter of the chasers.

5. A threading die comprising a body, a plurality of radially shiftable chasers and a cam carrier carried thereby, positive acting means for shifting the chasers and comprising a sliding ring, said cam carrier projecting into said ring and provided with shiftable cams for locking the ring, and a hood having a cam directly engaging said shiftable cams for controlling said cams whereby on the depression thereof said ring will be released to permit sliding thereof.

6. A threading die comprising a body, a plurality of radially shiftable chasers and a cam carrier carried thereby, positive acting means for shifting the chasers and comprising a sliding ring, said cam carrier projecting into said ring and provided with shiftable cams for locking the ring, a hood having a cam directly engaging said shiftable cams for controlling said cams whereby on the depression thereof said ring will be released to permit sliding thereof, and means for adjusting said cam carrier for controlling the diameter of the chasers.

7. A threading die comprising a body, a plurality of radially shiftable chaser carrying blocks carried thereby and having inclined slots, a cam carrier encircling said body, positive acting means for shifting the blocks and comprising a sliding ring having forwardly projecting cam formed studs co-operating with the slots of the chaser blocks, said cam carrier projecting into said ring and provided with radially shiftable cams for locking the ring, and a shiftable hood having a cam directly engaging said shiftable cams for controlling the operation of said cams whereby on the depression thereof said ring will be released to permit sliding thereof.

8.- A threading die comprising a body, a plurality of radially shiftable chaser carrying blocks carried thereby and having inclined slots, a cam carrier encircling said body, positive acting means for shifting the blocks and comprising a sliding ring having forwardly projecting cam formed studs co-operating with the slots of the chaser blocks, said cam carrier projecting into said ring and provided with radially shiftable cams for locking the ring, a shiftable hood having a cam directly engaging said shiftable cams for controlling the operationof said cams whereby on the depression thereof said ring will be released to permit sliding thereof, and means for adjusting the cam carrier thereby to adjust the diameter of the chasers carried by the blocks.

9. A threading die comprising a body, a plurality of radially shiftable chaser carrying blocks carried thereby and having inclined slots, a cam carrier encircling said body, positive acting means for shifting theblocks and comprising a sliding ring having forwardly projecting cam formed studs co-operating with-the slots of the chaser blocks, resilient means co-operating with the body and ring for shifting the ring rearwardly, said cam carrier projecting into said ring and provided with radially shiftable spring actuated cams for locking the ring, and a shiftable hood having a cam directly engaging said shiftable cams for controlling the operation of said cams whereby on the depression thereof said ring will be released to permit sliding thereof.

10. A threading die comprising a body, a. plurality of radially shiftable chaser carrying blocks carried thereby and having inclined slots, a cam carrier encircling said body, positive acting means for shifting the blocks and comprising a sliding ring having forwardly projecting cam formed studs co-operating with the slots of the chaser blocks, said cam carrier projecting into said ring and provided with radially shiftable cams for locking the ring, a shiftable hood having a cam directly engaging said shiftable cams for controlling the operation of said cams whereby on the depression thereof said ring will be released to permit sliding thereof, and means co-operating with the ring and the hood for shifting the ring in one direction on the movement of the hood.

11. A threading die comprising a body, a plurality of radially shiftable chaser carrying blocks carried thereby and having inclined slots, a cam carrier encircling said body, positive acting means for shifting the blocks and comprising a sliding ring having forwardly projecting cam formed studs co-operating with the slots of the chaser blocks, said cam carrier projecting into said ring and provided with radially shiftable cams for locking the ring, a shiftable hood having a cam directly engaging said shiftable cams for controlling the operation of said cams, resilient means co-operating with the body and the ring for shifting the ring upon depression of said cams, and means co-operating with the ring and hood for insuring the shifting movement of the ring in one direction.

12. A threading die comprising a body, a plurality of radially shiftable chaser carrying blocks carried thereby and having inclined slots, positive acting means for shifting the blocks and comprising a sliding ring having forwardly projecting cam formed studs co-operating with the slots of the chaser blocks, resilient means co-operating with the body and ring for shifting the ring, an annular cam carrier carried by the body and projecting into said ring and provided with radially shiftable spring actuated cams for locking the ring, a shiftable hood having a cam directly engaging said shiftable cams. for controlling the operation of said cams, whereby on the depression of said spring actuated cams said sliding ring will be released, means co-operating with the ring and hood for insuring the shifting of the ring in one direction on the movement of the hood, and an adjustable collar co-operating with the cam carrier for adjusting the position of the chaser blocks and thereby the chasers.

13. A threading die comprising a body having a shank, a plurality of radially shiftable chaser carrying blocks carried by the body and having inclined slots, positive acting means for shifting the blocks and comprising a sliding ring having forwardly projecting cam formed studs projecting through the body and co-operating with the slots of the chaser blocks, an annular cam carrier carried by the shank and projecting into the ring and provided with radially shiftable cams for locking the ring, and a shiftable hood having an inwardly extending cam directly engaging said shiftable cams for controlling the operation of said shiftable cams whereby on the depression thereof said ring will be released thereby to permitsliding of said ring.

14. A threading die comprising a body having a shank, a plurality of radially shiftable chaser carrying blocks carried by the body and having inclined slots, positive acting means for shifting the blocks and comprising a sliding ring having forwardly projecting cam formed studs projecting through the body and co-operating with the slots of the chaser blocks, an annular cam carrier carried by the shank and projecting into the ring and provided with radially shiftable cams for locking the ring, a shiftable hood having an inwardly extending cam directly engaging said shiftable cams for controlling the operation of said shiftable cams whereby on the depression thereof said ring will be released thereby to permit sliding of said ring, and an adjustable collar carried by the shank and in engagement with the cam carrier for adjusting the position thereof and thereby the diameter of the chasers.

15. A threading die comprising a body, a plurality of radially shiftable chasers and a carrier carried thereby, positive acting means for shifting the chasers and comprising a sliding member, means for locking said member, both of said means carried by the carrier, a shiftable hood for controlling the operation of and directly engaging said locking means and eiiective to release the locking means by depression thereof, and work guiding means carried by the body and projecting between the chasers, to prevent the work falling between the chasers when the die is open.

16. A threading die comprising a body, a plurality of radially shiftable chasers and a carrier carried thereby, positive acting means for shifting the chasers and comprising a sliding member, means for locking said member, both of said means: carried by the carrier, and a shiftable hood for controlling the operation of and directly engaging said locking means and effective to release the locking means by depression thereof, and a detachable work guiding means carried by the body.

17. A threading die comprising a body, a plurality of radially shiftable chaser carrying blocks carried thereby and having inclined slots, positive acting means for shifting the blocks and comprising a sliding ring having forwardly projecting camformed studs co-operating with the slots of the chase-r blocks, a cam carrier encircling the body and projecting into said ring and provided with radially shiftable cams for locking the ring, a shiftable hood having a cam directly engaging said shiftable cams for controlling the operation of said cams whereby on the depression thereof said ring will be released thereby to permit sliding of said ring, and a detachable work guiding means carried by the body.

18. A threading die comprising a body having a shank, a plurality of radially shiftable chaser carrying blocks carried by the body and having inclined slots, positive acting means for shifting the blocks and comprising a sliding ring having forwardly projecting cam formed studs projecting through the body and co-operating with the slots of the chaser blocks, an annular cam carrier carried by the shank and projecting .into the ring and provided with radially shiftable cams for locking the ring, a shiftable hood having an inwardly extending cam directly engaging said shiftable cams for controlling the operation of said shiftable cams whereby on the depression thereof said ring will be released therebyto permit sliding of said ring, and a detachable work guiding means carried by, the body.

19. A threading die comprising a body, a plurality of radially shiftable chaser carrying blocks carried by the body and having wing extensions adapted to engage the face of the body, a carrier encircling said body, positive acting means for shifting the chasers and comprising a sliding member, means for locking said member, both of said means carried by the carrier, and a shiftable hood for controlling the operation of and directly engaging said locking means and effective to release the locking means by depressions thereof.

20. A threading die comprising a body having a shank, a plurality of radially shiftable chaser carrying blocks carried by the body and having wing extensions adapted to engage the front face of the body and also having inclined slots,

positive acting means for shifting the blocks and comprising a sliding ring having forwardly projecting cam for-med studs. co-operating with the slots of the, chaser blocks, resilient means cooperating with the body and ring for shifting the ring rearwardly, an annular cam carrier mounted on theshank and projecting into said ring and provided with radially shiftable spring actuated cams for locking the ring, springs co-operating with, the body and cam carrier, a shiftable hood having a cam directly engaging said shiftable cams: and effective to depress the cams of the cam carrier and thereby release the stud carrying ring thereby to shift the chasers, and an adjustable collar carried by the shank and cooperating with the cam carrier to adjust the position thereof and thereby adjust the position of the chasers.

ALFRED E. DRISSNER.

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