US357180A - Machine for cutting screws - Google Patents

Description

(No Model.) `3 Sheets-Sheet 1. H. E. COY.

MACHINE FOR CUTTING SGREWS. N0. 357,180. Patented Feb. 8, 1887.

(No Model.) 3 Sheets-Sheet 2.

H. E. ooY.

MACHINE FOR CUTTING SCREWS.

4180.857,180. .Patented Feb. 8, 1887.

N. PETERS, Phwllhugmphnn Washingtun. DV C.

3 Sheets-Sheet 3.

(No Mom.)

H'. B.- GOY. MACHINE FOR GUTTING- SGREWS.

Patented Feb. 8, 1887.

W lTNEssgs:

. single operation, a rotating steel disk having 5o tion-clutch a.

UNITED STATES PATENT OFFICE.'

HENRY n OOY, or TOLEDO, OHIO.

MACHiNE FOR CUTTING SCREWS.

SPECIFICATION forming part of Letters Patent No. 357,180, dated February 8, 1887. Application llcd January 11, 188,6. Serial No. 188.207. (No model.)

To @ZZ whom it may concern:

Be it known that I, HENRY E. COY, a citizen of 'the United States, residing at rIoledo, Lucas county, Ohio, have invented certain new and useful Improvements in and relating to ScrewLCutting or Screw-Threading Machines, of which the following is a specification.

The object of lmy invention is to provide,.

as a'means or tool for cutting and finishing large pointed screw-bolts or lag-screws by a a toothed periphery, the teeth and notches of which are arranged spirally to the disks axis, the corners of the several teeth formed by the lat* as cutting-points or chasers; also, to provide inea'ns for' giving such cutter and the bolt to j l porting roller attached Ato rotary cutter, and .A 30

represented in place on its adjustable seat; Fig. 7, an end elevation of the same; Fig. S, a plan of the same, Fig. 9, a side view of former or roller-guide in place on its plate; Fig. 10, an end View of the same; Fig. l1, a plan view of the same; Figs. 12 and 13, plans of rotary cutter and screws partly out; Fig. 14, an end view of traveling head and mechanism for releasing the same from feed-screw; Fig. 15, a rear elevation of same; Fig. 16, an end view of nut m, hereinafter'referred to; and Fig. 17, a side view of same.

The same letters areused to indicate like parts throughout the several gures.

My machine is mounted upon astout frame or table. A spindle carrying the bolt to be threaded is provided with a socket to receive the head of the bolt I), andY is driven directly by cone-pulley A, which is made to run fast or loose on its shaftat will by means of fric- Bolt b is braced and prevented from yielding or bending from the pressure of angle ofthe face and side of the disk servingthe cutter by means of guide-block b on traveling head Rotary toothed'cutter c, which resembles a disk cut transversely froin alarge multiple-threaded screw, rotates horizontally, the upperscorners or angles of the teeth of the cutter forming a series of cutting or chasing edges.

Bolt b, in Figs. 1, 2, 12, and 13, revolves from the observer, and cutter c revolves from left to right, so that the shavings are taken off toward the point or end of bolt b.

At the beginning of the operation, bolt b to be threaded and pointed being in place, cutter c is set touching the bolt, and so that the circle described by the cutting edges or corners of the teeth of cutter c touches the extended line of the a`Xis of the bolt. Bolt b being caused to revolve, cutter c is also rotated at such constant rate of speed that for each revolution of bolt b cutter c rotates the distance ofA from the face of one tooth to the corresponding face of the next tooth, allowing also for the forward travel of cutter c. From this point, besides its rotary motion, which, for convenience, may be called its first motion, cutter c has also the following motions, viz: second,

forward in the direction of the line of bolt b third, away from the center line of bolt b gradually, according to the taper of point required; fourth, when bolt b is threaded as far as desired, still farther away `from the bolt; so that the cutter no longer touches the bolt,and, llfth, the return to its starting-point.

Vertical shaft d of cutter c, Figs. 4 and 5, is provided with worm-wheel @engaging screw f on square shaft g, on which is pinion 10. The first or rotary motion, at a speed relative to that of bolt b, as above stated, is communicated to cutter through train of gearing l (on shaft of `cone-pulley) 2 3 t 8 8 9 10, shaft g, screw f, and worm-wheel con shaft d.

Box h, containing shaftd and worm-gearing ef, is attached to sliding head t', secured to and running upon shears or way k. Horizontal feed-screw Z, extending the entire length of way @revolves in a groove in the upper face of 7c, so that only a small part of the screwl appears above the upper face of way k. Through a vertical opening in head t', directly over screw Z, is inserted half-nut m, which 4en- IOO gages the upper part of horizontal feed-screw y l. Screwl centers in pinion 7 and receives motion through train of gear-wheels l, 2, 3, 4, 5, 6, G, and in the order mentioned. Screw Z being caused to revolve, nut m, being forced down upon the screw, travels along said screw, carrying with it sliding head t and box h, attached thereto, together with cutter c, shaft (l, worin-wheel c, and screwj', the latter sliding upon square shaft g. The rapidity of the horizontal travel or feed of rotary cutter c may be governed by theY lead of screw l and nut my. The screw I, as a means of securing the feed of cutter c horizontally as the cut progresses, is not, nor is the worm-gearing d e f g, as a means of securing rotation of the cutter, absolutely essential, for without these, when the cutting-corners of c catch the iron of bolt b properly, a slight spiral cut is at once formed on bolt b, which, growing` constantly deeper by engaging successively the spiral teeth of cutter c, causes said cutter to both rotate on its axis (after the manner of wormgearing) and to feed forward, and thus to perform its office; but I prefer the herein-de scribed positive means of securing rotation and feed of cutter as more certain, expeditious, and uniform in results.

For the purpose of securing its third and fourth motions above mentioned, rotating eutter c is designed and arranged to tilt to and from bolt b in such a manner thatthe cutting-edges describe an are of a circle of which square shaft g is the center. On shaft g, at each end of screwj", fitting loosely ou said shaft, so as to slide, (see Fig. 5,) are collars n, having cy.- lindrical exteriors. Over collars u are slipped sleeves a', which are screwed into box 71 as shown in Fig. 5. Plate o, having at each end sockets p, (see Figs. 14 and 15,) is bolted to head t'. Sleeves n are slipped into sockets p, fitting loosely therein. Socketsp are prevented from rotating by their connecting-plate o being bolted to head t, and collar u is prevented from rotating by square shaft g; but sleeves n', with their attached box h and its appendages,) fitting loosely between collar a and sockets j), are permitted to rotate vertically on shaft g as a center.

Attached to box 7L is curved arm q, bearing at its outer end roller r, arranged to travel in the direction of motion of sliding head t. By depressing or elevating roller 1' cutter c is thrown from or toward bolt b, as the case may be, thus providing for giving taper to the bolt being threaded, or for removing the cutter c entirely from contact with bolt b. Plate s is aformerorroller-guide, upon the upper edge, s', of which roller r travels. Surface sis shaped so as to conform to the required size, taper, and general shape of the screw to be cut, the roller Ir in traveling over surface s causing cutter to tilt to or from bolt b, in conformity with the lines and undnlations of said surface s', without interruption of the rotary or forward movelnentvof cutter c.

To permit cutter c, it having completed its cut, to tilt far enough away from bolt l to return to its original position without coming in contact with the thread just formed, I provide means for dropping former or roller-guide s s slightly as soon as the thread is finished, so that rollcri1 may travel back on a lower level. I also provide nieans for raising said guide to its original level as soon as cutter c is returned for a new bolt. Plate t, (see Figs. 6, 7, and 8,) which by means of set-screws L is adjustable longitudinally, is stationary. On a seat on plate t slides plate u, having standards a', supporting adjustable horizontal rods u2. Projections u on the upper edge of plate a coincide with and support similar projections, o, on the lower edge of plate v, to which former or roller guidcplate .s' is attached. Plate c is provided with an arm, w, extending downward, which dovetails and slides vertically in slide w in plate t. It will be observed that plateuonlymoveshorizontally,whileplate o only moves vertically, both being attached to plate t, which can be set to correspond with the cut to be made on any length of bolt b. The rotary cutter having advanced along bolt b as far as desired, roller r comes in contact with forward rod, a?, which is previously set at the proper point, causing plate u, with vits projections u, to slide forward, removing the supports from under projections c', which drop into recesses at, causing plates @and s to drop,

and causing roller r, and consequently cutter c, to tilt away from bolt b, preparatory to the return ofthe cutter to its original position.

When the screw has been threaded as far as required, and the cutter has tilted away from bolt b, a slip-collar and stop, provided with set-screw and adj ustahle on rod w, (said stop having been previously set the proper distance in advance of head 2,) comes in contact with the upper end of catch y, forcing it off lug m on nut m, releasing the nut, so that it is raised from contact with serewZ bythe downward pull of spring nf on lever m. Sliding head t', being now released from the feed of screw Z, is, with all its attachments, caused to travel quickly back to its original position by means of a weight or spring. (Not shown in the drawings.) Roller r on its return comes in contact with rear rod, u2, causing plate u to slide backward, lifting plate c and its former or roller-guide s, together with cutter c, to their original position by means of the beveled or wedge-shaped sides of projections a and c' touching and sliding upon each other. A fresh bolt having been supplied, the workman forces downward the handle of lever m, throwing nut m into gear with fecd-screw l. Catch y now slips over` lug in', being forced forward and held in position by upward pressure of spring y until again tripped by contact with stop :0.

Means for dispensing with any motion of my cutter, save the rotary motion, will suggest themselves to skilled machinists, it being quite practicable to cause bolt b to advance and recede longitudinally and laterally while the thread is forming; but such mechanism would,

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357,180 J l i 3 n obviously be merely the mechanical equivaf lents of the herein-described methods of obtaining the several necessary positions of cutter and bolt relatively to each other, and I do not, therefore, limit my invention tothe means herein indicated of obtaining the 'rates of speed and positions of bolt b and cutter c relatively to each other necessary in threading screws with my'rotary toothed cutter. v

Having fully described the construction and manner of operatingmy machine, what I claim as my invention, and desire to secure by Letters Patent, is

l. In a screw-cutting machine, rotary cutter c, in combination with means for causing said cutter to rotate on its axis at a suitable rate of speed relatively to the rate of speed ofthe bolt to be threaded, substantially as shown and described, for the purposes specified.

2. In a screw-cutting machine, rotaryy cutter c, in combination with means for causing` said i cutter to recede from the axial line of bolt b,

substantially as shown and described, for the purposes set forth.

3. In a screw-cutting machine, cutter @,combined with means for causing said cutter to rotate on its axis and to advance along the bolt to be threaded, substantially as shown and described, for the purposes set forth.

4. In a screw-cutting machine, cutter c, combined with means for causing the same to rotate on its axis, to advance along'the bolt to be threaded, and to recede from said bolt laterally, substantially as -shown and described, for the purposes specified.

5. In a screw-cutting machine, rotary cutter c, in combination with means for causing the same to rotate on its axis, to advance along the bolt to be threaded, to recede from said bolt according tothe taper thereof,and to return upon the completion of its cut to its starting point, substantially as shown and described, for the purposes specified.

6. In combination with toothedl cutter c, shaft d, worm-wheel e, screw f, and shaft g, substantially as shown and described, for the purposes specified. Y

7. In a screw-cutting machine, cutter c, in combination with shaft d, Worm-wheel e, screw 5o f, shaft g, head t', and feed-screw Z, substantially as shown and described,for the purposes set forth.

, S. In avscrew-cutting machine, rotary cutter c and its supporting mechanism, in corn.

bination with guide or former s s', substantially as shownand described ,for the purposes stated. e Y

9. In a screw-cutting machine, in combination with rotary cutter c, its supporting mechanism, and guide or former s s', a means for causing the latter to drop at the completion of the thread and toresume its original level upon the return of cutter c toits startingpoint, substantially as shown anddescribed, for the purposes set forth.

10. In a screweutting machine, rotary cutter c; head t', and feed-screw Z, in combination with former or guide s s', substantially as shown and described,` for the purposes specied.

11. In a screw-cutting machine, cutter aand its supporting mechanism,- in combination with former or guide s s', having projection o and arm w, plate u, having standards u', rods u, projections a3, and recesses u, and adjustable plate t, having slide w', substantially -as shown and described, for the` purposes set` forth. Y

v 12. In ascrew-cutting machine, rotary cutter c and its supporting mechanism, in combination with feed-screw Z, head t', nut m. lug m', spring m2, lever m3, stop x, and catch i, substantially as shown and described, for the purposes specified.

' 13. In a screw-cutting machine,rotary cutter c and its supporting mechanism, head t',

screw Z, nut m, lug m', spring m2, lever m3, stop' x, and catch y, in combination with suitable means for causing cutter c to return upon cornpletion of thread to its starting-point, substantially as shown and described, for the purposes set forth.

14. In a screwcutting machine, rotary cutter o, in combination with shaft Z,Worm-whee1 e, screw f, shaft g, collar n, sleeve n, plate o, having sockets p, and head t. substantially as shown and described, for the purposes set forth.

15. In a screw-,cutting machine, rotary cutter c, in combination with pulley A, shaft g and its train of gearing, screwf, wornrwheel e, and shaft eZ, substantially as shown and described, for the purposes specified.

16. Inra screw-cutting machine, rotary cutter c, in combination with pulley A,screwZ ioo and itstrain of gearing, nut m, head i, shaft HENRY E. COY.

Witnesses:

H. E. KING, W. F. CULBERsoN.

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