US1358074A - Die-head - Google Patents

Description

W. H. GATES.

DIE HEAD.

APPLICATION FILED .IULY 26.19I9.

1,358,074. Patented Nov. 9, 1920. V 71391 fi TigqZ INVENTO I 1 ATTORNEY w. H. GATES.

DIE HEAD.

APPLICATION FILED JULY 26,1919.

1,358,074. Patented Nov. 9, 1920.

2 SHEETS-SHET 2.

I 11 ATTORNEY UNITED STATES WILLIAM H. GATES, OF NEW HAVEN, CONNECTICUT.

DIE-HEAD.

Application filed July 26, 1919.

To all whom it may concern:

Be it known that l, VILLIAM H. GATES, citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in .l)ie-Heads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it ap pertains to make and use the same.

My invention relates to thread cutting tools of the character known in the trade as die heads, it being an improvement on the patent granted to me August'3, 1915, No. 1,18,510. One of the several improved features of the present construction consists in locating the cam, for actuating. the threading dies, in close proximity to the axis of the die head, thus greatly reducing the size of the die head for cutting threads on small screws and work of like character.

Referring to the drawings wherein the same figures and letters of reference indicate like parts throughout the several views;

Figure '1 represents a front elevation of the die head showing the threading dies closed;

Fig. 2 is a front elevation of the die head showing the dies opened;

Fig. 3 is a side elevation of the die head showing the position of the several members when the dies are closed also broken view partly in section of two of the members- Fig. 4' is a broken view partly in section of the die head showing the trip lever depressed so as to release the shell;

F i 5 is a detail plan view of the overhanging bracket and broken view of its shank and shank of the die head;

Fig. 6 is a rear elevation of the die head and sectional view of the overhanging bracket on line 6-6 of Fig. 3;

Fig. 7 is a front elevation of the shell and head carrying the dies with the front plate, overhanging bracket, cam lever, and trip lever removed;

Fig. 8 is a detail view and rear elevation of the head adapted to carry the threading dies- Fig. 9 is a front elevation and interior view of the shell, broken View of the cam lever extension and sectional view of the shank of the die carrying head;

Specification of Letters Patent.

Patented Nov. 9, 1920.

Serial No. 313,509.

Fig. 10 is a broken view of the die carrymg head and shell, showing the latter in open position;

Fig. 11 is a central sectional view of the shell, die head and broken View of the shank of the die head, on line 11--11 of Fig. 7

F 1g. 12 is a detail broken view of the cam lever;

Fig. 13 is a central sectional view of the die carrylng head and broken view of its shank, central sectional view of the shell, cam lever, its hub and the plate located between the head and cam lever on line 13r-l3 of Fig. 1;

Fig. 14 is a detail view of one of the threading dies; and

Fig. 15 is a broken sectional View of the cam lever, and broken view of the die head shank, showing the cam grooves located in the shank.

The head 1 is provided with the radial slots 2 to receive the threading dies 3 and the shank at integral with the head 5 is a plate secured to the front end of the head by the screws 6, Figs. 1 and 2, and '7, Fig. 7, are threaded holes in the head for said screws. 8 is the die actuating shell mounted on the periphery of the head 1. The four cam studs 9 are anchored to the shell and have a movement therewith and are also movably supported in the holes 10, Fig. 8, formed in the head 1.

The threading dies are each provided with a cam groove similar to the groove 11, Fig. 14, adapted to receive the cam projections 12 of the studs 9 whereby the dies are radially actuated by the reciprocation of the shell 8.

13 is atrip lever pivotally supported in V the periphery of the shell 8 and on the pin 14, Fig. 9. 15, Fig. 13, is a locking bolt located in the hole 16 of the head 1 and it extends through the hole 17, Fig. 9, of the vertical part of the shell 8. 18, Fig. 13, is a notch in the forward end of the bolt adapted to receive the tail piece 13 of the trip lever, and 14, Fig. 9, is a spring to maintain the trip lever with said notch. 19 is an adjusting screw adapted to adjust the notch with respect to the position of said tail piece. 20 is a hole through the plate 21 in alinement with the bolt 15 to give it end clearance.

The mechanism for automatically advancing and locking the shell 8 to the head 1 consists of the cam late or lever 22 having the hub 23 journa ed on the shank 4 of the head. The central opening 24, Fig. 11, of the shell and a similar central opening in the plate 21-not shown-embraces the hub 23, as shown in Fig. 13. The bore 25, Fi

The assembled die head is advanced- 12, through the cam lever is provided wit the cam grooves 26-see also Figs 6 and 9-registering with the outer surface of the shank 4 and adapted thereby to receive the in 27 projecting through the shank 4 of the head 1seen also in Fig. 8.

The cam lever 22 is rotatably secured to the plate 21, Fig. 6, by means of the screw 28, located in the slot 29, while the screws 30 secure the late 21 to the shell 8. 31 is a stop pin/a" aptedto be engaged by the shoulder 32, Figs. 3 and 6, when the cam lever is rotatedto close the threading dies, and to be engaged by the opposite shoulder 33 when the threading dies are opened and the cam lever is inthe position shown in Fig. 2. The stop pin 31 has a longitudinal movement in the hole 31, Fig. 8, of the shell 8, and a similar hole-not shown-in the plate 21, and it is backed up by the spring 34 so that it can be depressed to permit a further reverse rotary movement of the cam lever a distance sufficient to release the cam studs from the dies so that the dies can be removed. It is also depressed by the inner face of the cam lever 22 until said cam lever is fully seated in its normal workable po sition against the face of the plate or ring 21, when the stop pin will snap into the re- 4 cess 22 'Fig. 6, of the cam lever. In removing the cam lever, the pin 31 will also be depressed to permit of a, reverse rotary movement of said lever.

35 is a bracket overhanging the members 5, 8, 13' and 21 and has the hollow shank 36 adapted to be secured in a turret head or -other like carrier--not shown-for actuating the tool to and from the work. The shank 4 of the die head Fig. 3-has a sliding fit in the shank 36 and is operatively retained therein by the pin 37 embraced by the elongated slot 38. The threaded end of the screw 39 engages the threaded hole 40 see also Fig. 8-and the die head relief spring 41 is located between the end of the shank 4 and the partition 42, while the spring 43 is located between the head 44 of the screw and said partition. The object and purposes of these springs will be hereinafter more fully explained.

The overhang portion of the bracket 35 A carries the trip pin 45 whose threaded end is engaged by the nut 46. 47-see also Fig.

5--1s an adjusting screw adapted to locatethe position of the trip pin with respect to the trip lever 13.

48, Figs. 4 and 9, are springs located in the holes 49 projecting through the body of the shell 8 and resting against the inside face of the plate 21. 50, Fig. 8, are corresponding holes or-recesses in the head 1 in which the opposite ends of the springs are located when the head 1 and the sleeve are assembled. v

The operation of the device is as follows:

through the medium of the turret head, not shown-toward an article to be threaded, and, during such advance, the extension 51 of the cam lever 22 will engage with a proect1onnot shown-in line with the forward movement of the die head and cause the cam lever 22 to rotate toward thespring 41, Fig. 3, will allow the die head to give back slightly until the dies have taken hold in a proper manner. As soon as this takes place, the die head, with its shank 4, Fig. 4, will be carried along by the threading operation, and, in doing so, compress-the spring 43, Fig. 3. The threadcutting will continue a predetermined distance due to the position of the trip pin, 45, when said piirwill engage the trip lever 13; Figs. 2 and 4, to release its engagement with the locking bolt, whereupon the springs 48 will force the shell back into its normal open position shown in Fig. 10. This reverse movement of the shell will also reversethe movement of the cam lever v22 into its normal position shown in Fig. 2.

As soon as the shell is released, the stored to their normal positions shown in Fig. 3.

While I show theplate 21 secured to the die head, and the cam lever rotatably connected to the plate, said plate could be dispensed with and the cam lever rotatably connected to the head. 7 v

The cam grooves 26*, Fig. 15, could be located in the shank 4 of the die head, and the in 27* in the cam lever if so desired.

aving thus described my invention, what I claim is 1. In combination with a die head carrying radially operating threading dies and a shell embracing the head carrying cam studs engaging the dies, said head having a shank, a cam lever having a bore provided studs engaging the dies, an adjustable locking bolt mounted in the head, a trip lever pivotally supported in the shell. said head having a shank, a cam lever rotatably carrying radially operating dies and an adjustable locking bolt, a shell embracing the head carrying die actuating cam studs, a trip lever mounted in the shell adapted to engage with the bolt, said head having a shank, a cam lever rotatably mounted thereon and located in workable relation with the shell, said lever having internal cam grooves registering with the surface of the shank, means carried by the shank to register with the cam grooves, and a stop pin to limit the rotative movement of the cam lever.

4. In a die head of the character described carrying radially operating dies, an adjustable locking bolt within the head, a shell embracing the head carrying die actuating cam studs, a trip lever mounted in the shell,

said head having a shank, a shell actuating cam lever rotatably mounted on the shank and having internal cam grooves registering therewith, means on said shank adapted to register with said cam grooves, a bracket having a shank embracing the die head shank and in which said die head shank has a longitudinal movement under spring tension, and means carried by the bracket to engage the trip lever and release the shell from its locked engagement with the die head.

5. A die head having a shank integral therewith, a locking bolt, a sliding shell embracing the head, a trip lever carried by the shell, a bracket overlying the shell, adjustable tripping means carried by the bracket adapted to engage the trip lever and release the shell, said bracket having a shank embracing the die head shank in which the die head shank is adapted to have a longitudinal movement under spring tension.

6. A die head carrying radially operating dies, an adjustable locking bolt within the head, a sliding shell embracing the head and carrying die actuating cam studs, a trip lever carried by the shell, said die head having a shank, a cam lever rotatably mounted on said shank and in workable relation with the shell and having internal cam grooves registering with the shank, means on said shank registering with the cam grooves, an

overlying bracket, said bracket having a shank adapted to support the die head and embracing the die head shank, a relief spring for the die head located within the bracket shank, said cam lever having an extension adapted to be actuated to rotate said lever and advance the shell into locking engagement with the die head, means carried by the bracket to engage the trip lever and release the shell, and a spring located within the bracket shank and under control of the die head shank adapted to store up tension during the threading operation and return the die head to its normal position after the shell is released.

7. A die head having a shank and carrying radially operating dies, a shell embracing the head carrying die actuating cam studs, a member rotatably mounted on the shank in workable relation with the shell and having internal cam connection with the shank whereby the shell is actuated to close the dies.

In testimony whereof I affix my signature.

WILLIAM H. GATES.

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