USRE9290E - Chbistopher m - Google Patents

Description

O..M. SPENCER,

Assignor to THE HARTFORD MACHINE ScREw 60..

Machine for Making Metalsorews v No. 9,290. V Reissued lu ly 13, 1880.

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IWITNCESEEI; }|\|\/ENTEIF\-.

" UNITED STATES PATENT OFFICE.

CHRISTOPHER. M. SPENCER, or HARTFORD, CONNECTICUT, ASSIGNOR TO THE HARTFORD MACHINE seanw COMPANY, or SAME PLACE.

MACHlNEFdR MAKING METAL SCREWS.

SPECIFICATION forming part of Reissued Letters Patent No. 9,290, dated July 13, 1880.,

Original No. 143,306, dated September 30, 1813,- Reissue No. 5,836, dated April 14, 1814. Application for reissue filed April 14, 1880.

To all whom it may concern:

Be it known that I, CHRISTOPHER M. SPENCER, of Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Machines for Making Metal Screws, of which the following is a specification, reference being had to the accompanying drawings. Figure 1 is a top or plan view of the whole in machine. Fig. 2 is a view, in central longitudinal section, of the chuck and its immediate attachments. Fig. 3 is a view of the front end or mouth of the chuck. Fig. 4 is a detached \iew of the frictional feeding device which I 5 {.L'lEtSDS and feeds forward the metal rod from which the screws are 'inadel verse vertical section of the left of the machine on the dotted line a; m. Fig. 6 is a side view of the tool-carriage dctachedfrom the machine. The machine automatically makes screws upon the end of a rod. This my improved machine has been organized with especial reference to operate upon the end of a rod, form a screw, remove the threading-tool from the 2 5 screw-thread cut on the rod,-cut off the said screw, and then to automatically feed the rod forward and make another screw, and so on until the rod is exhausted. I

By my plan the intermittent feeding of the red is effected by a frictional feeding device made as a slotted rotating and reciprocating and the rod is rotated by a. rotating chuck havin g jaws, the chuck having no function whatever in the forward movement of the red; and in connection with such mechanism to feed forward and rotate the rod at the proper time, I have combined and arranged a rotating tool-carrying turret, the tools of which are brought intermittingly into proper position to tube,

40 turn down and thread the end of therod; and

the screw having been threaded and tliethreading-tool removed from it, a cutting-off tool is moved forward and made to cut the screw from the end of the rod.

By feeding the rod forward by means of 2. friction-feed such as herein employed, rather than by a chuck, I am enabled to simplify the coifitruction of the chuck, as it has but one motion-via, that of rotation-and by employing a rotary tool-carrying turret and cuttingoff tool, as hereinafter set forth, I am enabled to form and thread the screws and cut them off, all in the simplest and most expeditious manner, my mechanism, by reason of its simplicity and mode of operation, increasing the speed of manufacturing screws and decreasing their cost beyond what would be the case if the turning-down and threading tools were operated by independent carriers; and so, also,

by withdrawing the threading-tool from the screw before it is cut from the rod the use of ascrew-driver to remove the screw from the threading-tool is obviated.

Theletteradcnotes the base of the machine,

4 and b the main shaft, driven by a belt running on the pulley I). On the main shaft isa cam, c, for giving an intermittent reciprocating motion to the slide 0', for a purpose indicated hereinafter. An arm, 0*, upon this slide en gages with the collar d of the frictional feed device or tube and causes it to reciprocate with the slide 0'. Through the longitudinal center of the friction-feed or tube 11 passes the rod 0, from which the screws are made. 7

The front end of the tube is slotted at (P, 7 and sprung togetherso as to embrace the rod c-tightly enough to make it move longitudinally with the tube except when the rod is grasped by the chuc g.

7 On the main shaft I: is a'cam,-f, to intcr|nit- 8otently reciprocate the slide f, having an arm,

engaging with the collar f 3 on the sleeve f. The friction-fwd device or tube 11 runs inside the sleeve 1', and the slcevof inside the shaft 0, rotated by a belt running on the pulley e. At the end of-this shaft 0 is the chuck g, provided with two jaws, g, ivoted at g.

The end of the slecvef is shown as made conical, in order that when forced forward between the jaws y it will act to press the rear 0 ends of the jaws g outward and their front ends inward, so that they will pinch and hold the rode to prevent longitudinal movement of it, yet cause it to rotate with the shaft 0.

When the tube (1 moves forward the jaws g 5 g are opened, and the tube d, then grasping the rod, carries or feeds it forward, causing it to project beyond the mouth of the chuck gfar length. The rod having been fed forthe desired distance, the sleeve f is vcd forward, causing the jaws g g of the a. to grasp and hold the rod 0, so that when the tube d moves backward it cannot carry the rod 6 with it, the chuck, during the backward movement of the tube, causing the rotation of the rod 0, so that it. can be operated uponto make a screw.

, @he-tootcarriage h, fitted in suitable ways or the frame, is reiprocate'd longitudinally by e cam h on the shaft 1), the said cam. engag the wing it at the side of the tool-carriage. tootcarriage is provided with the rotattnrreth This turret has an intermittent r :ep-bystep rotation to bring, one at a time, I attached tools into position for operating on E1 and of the rod 6 to form a screw.

The turret is rotated by means of a pawl and ratchet, one of which is attached to the turret and the other to the base, as is common in sorewmachines.

In the drawings but two tools are shown attached to the turret-the forming-tool n,which cuts down the body of the rod e to the proper diameter of the screw, and the screw-cutting die within the half-clutch m, which cuts the thread upon the screw.

The half-clutch m is placed upon the shaft 0, which runs through the turret,and can turn freely in it except'when the carriage and turret are moved towardlflthe chuck g, during which time the half-clutch 1), fast on the tur- 5 ret, engages with the half'clutch m and holds it stationary while a thread is outupon the screw.

When the thread has been cut the'die is run oft the thread in the following novel mane. Ubait, r, driven by abelt on the pulley 'r', the =1 rotating faster than the shaft c. On the shaft 4* is a friction-roll, r. The shaft 7 hang in loose or spring bearings, so that ay have some little plav toward and from o. A cam, s, on the shaft b operates ?er s pivoted at s at the proper time, a it to depress the shaft 7* and bring the n-rclir into contact with the frictionn nonthe shaft 0,- thus causing the shaft dire ion with but faster than the shaft 6 and rod 6, so that the screw-cutting die is run ofi' the th zad it has just cut by means'of its aceel-era on of'speed oven-the speed of the rod c. The cutting-011' tool t, attached to the toolblock t", moving back and forth transversely the base at, (its forward'movement given by the cam b on the shaft I; and its return movement byfthe spring 16 now comes forward and cntccfl' the screw-blank from the rod 6, after which the machine is again ready to go through the operation of making another screw.

In screw-machines heretofore made employin g turrets to carry the difl'erent tools for forming'the screws the operationsof feeding the rod 0, of rotatingthe turret, and-of bringing eno u to furnish material for a screw of the r r? Overlying the rear end of theshaft o is new-cutting die to revolve in the same,

up and carrying back the cutting-oft tool have heretofore been performed by hand.

I am fully aware of United States Patent No. 120,044,.October 17 1871, containing a rotating spindle having springs to engage and hold the rod so that it will revolve with the spindle, chuck to engage and feed the rod forward and rotate with it and move back over the rod while held by the springs of the rotating spin-J In this latter patent the threadingtoo'l, is' made co dle. carried, by an independent arm, form the thread at the end of the rod, and while the threading-tool yet retains within it the threaded end of the said rod a cuttingscrew in the threading-tool, by which it is presented successively to the action of other tools to complete the head of the screw and slot it, after which the screw is extracted from the threading-tool by a screw-driver.

I do notbroadly claim a rotating turret in a screw-machine, as I am aware that such turret is used in other screw-making machines; but 1 am not aware that a rotating turret provided with a series of tools has ever been employed'in connection with automatic mechanism for progressively feeding forward a rod to the tools of the said turret, the turret being also automatically operated.

I do 'not claim anything shown in United States Patent No. 120,044.

I claim as my invention from a rod, the combination of the sliding carriage, the rotating tool-carrying turret there on, its threading-tool to cut a thread on the rod and then withdraw from the part of the rod and .a reciprocating and rotating 1 tool is made to sever the rod and leave the ice 1. In amachiueto aut' maneanyarm screws so threaded, mechanism to grasp and rotate Y the rod, the cutting-off tool to separate the threaded screw from the end of the rod, as described, after the removal of the threadingtool, and means to operate the'cutting-ofi' tool at the proper time, all substantially as set forth.

- 2. In a machine to form a screw at the end of a red, the rotating and horizontally-moving slotted friction-feed device and the rotating hollow shaft and chuck, combined with the sleeve located between the friction-feed device and the said hollow shaft, to operate the jaws of the chuck to hold the rod while the friction-feed device is being drawn backward, substantially as described.

3; The friction-feed device (1, slotted as at scribed, the hollow shaft and attached chuck,

and the interposed conical -ended sleeve f combined with means, substantially as described to move the sleeve backward and release th'j aws of the chuck. fromthe rod, and to move-forward the said friction-feed device -to prqiectthe end of the rod beyond the end of the chuck far enough to insure proper length of rod for the screw it is desired to make.

4. In combination, the revolving chuck g, provided with jaws g, the friction-feed device 11,111 grasp the rod and the sleeve f, the cam 4 ing turret h tin g-ofl'T tool t, tool-stock t, and cam 13, all operating automatically, and all constructed, arranged, and designed for operation an use substantially as shown and 7. In a screw-cutting machine, rotate the rod, combined with the screw-thread ing tool andits spindle, and with mechanism adapted to rotatc the said spindle in the direction of rotation of the but at a faster speed, the th reading-tool from the screw formed atthe endof the 'rodwrh le heldby the chuck,

or its equivalent, to reciprocate the tube 41 intermittingly to feed the rod forward, and f, or its equivalent, to reciprocate the close the aws while the rod 18 6. The combination of the rotating tool-bearthe lever s, s, or its equivalent, the whole constructed, arranged, and designed for opersubstantially as set forth.

CKRISTOPHER M. SPENCER.

carriage h, cam" h with the cutd. h, shaft 0,

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