US703986A - Machine for cutting worm-threads. - Google Patents

Description

No. 703,986. I Patented July 8, I902. J. P. BROPHY.

MACHINE FDR CUTTING WORM THREADS.

(Application filed July 30, 1900.) (No Model.) 4 Sheets-Sheet I.

W6 mess e Patented July-8; 1902. J. P. BROPHY. MACHINE FUR CUTTI'NG WORM THREADS.

(Application filed July 30, 1900.)

4 Sheets- Sheet 2.

(No Model.)

Hm nU UH Wtlzesses,

5 Farms 00. PHOTO-LITFO" WASHINGTON, D.

No. 703,986. Patented July 8, I902.

J. P. BROPHY.

MACHINE FOR CUTTING WORM THREADS.

(Application filed July 30 1900.)

(N0 Mqdel.) 4 Sheets-Sheet 3.

L *R Q Q W8 we I "w H P3 Fl A No. 703,986. Patented July 8, I902.

J. P. BROPHY.

I MACHINE FOB CUTTING WORM THREADS.

(Application filed July 30, 1900.)

(No Model.) 7 4 Sheets.$heet 4.

UNI

JOHN P. BROPIIY, OF CLEVELAND, OHIO, ASSIGNOR TO THE CLEVELAND MACHINE SCREW COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF oHIo.

MACHINE FOR CUTTING WORM-THREADS.

SPECIFICATION forming part of Letters Patent No. 703,986, dated July 8, 1902. Application filed 11.15.30. 1900. Serial No. 25,261. (No model.)-

To ctZZ whom, it may concern.-

Be it known that 1, JOHN P. BROPHY, a'citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State of Ohio, have invented a new and useful Improvement in Machines for Cutting WVorm- Threads, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I to have contemplated applying that principle, so as to distinguish it from other inventions.

My invention relates to machines for cutting worm-threads; and it consists of means hereinafter fully described.

The annexed drawings and the following description set forth in detail certain means embodying the invention, such disclosed means constituting but one of various mechanical forms in which the principle of the invention may be used.

In said annexed drawings, Figure I represents a plan viewof a machine embodying my invention; Fig. II, a front elevation thereof; Fig. III, a longitudinal cross-section of a portion of the machine, on an enlarged scale, taken upon the plane indicated by line 3 3, Fig. I; Fi IV, a second longitudinal cross section of a portion of the machine, on an enlarged scale and taken upon the plane in- 0 dicated by line 4 4, Fig. IV, showing the central spindle in elevation therein; Figs. V and VI represent enlarged perspective views of detail parts.

Upon suitable guideways formed upon the bed A'of the machine is mounted a longitudinally-movable tool-carriage B, upon which is supported a split bearing 6, which secures a rotatable'arm b, actuated longitudinally by a crank 19 The inner end of said arm is pro- 0 vided with a journal for a transversely-located tool-spindle 79 Fig. I. 'A pulley C is geared with a driving-shaft C, which is connected with the end of the tool-spindleby means of an intermediate shaft C provided 5 with two universal elbow-joints c and 0, whereby it is seen the said tool-spindle may be driven while inclined and during the movement of the carriage. The line" of toolspindle axis and the line of the axis of arm b are caused to lie in the same plane. A ro- 5o tary cutting-tool G is secured to the end of the tool-spindle and in a position such as to cause its center to lie in such plane. It is therefore seen that the movement of the arm Z) upon its axis will always permit of the work to be cut equally on each side of said plane, the tool therefor always occupying the same position relatively to the axis of rotation of the work, thereby insuring the proper operation of said tool upon such work.

The live-spindle cl of the head-stock D, Fig. III, is driven by means of differential gearing Diactuating a driving-shaft upon which is secured a worm D, geared with a wormwheel D Fig. I, mounted upon said livespindle. The outer end of said live-spindle is connected by means of suitable gearing with a longitudinal shaft E. (Shown in dotted lines in Fig. I.) Said worm-Wheel is, however, disconnectibly secured to spindle d by means of a friction-clutch D Fig. III. One clutch member, d, is secured to the spindie. The other, 61 is secured to or apart of worm-wheel D The engagement of the two members is effected by means of ahand-wheel D which has rotative bearing upon a rod (1 sliding within the outer spindle end. Said wheel is formed with a female thread which engages the threaded outer end of the outer spindle part. Said rod is formed with a shoul- 8o der d which engages a thrust-washer d in the nut, as shown, and is provided with a threaded outer end and a nut therefor, said nut and shoulder hence securing the handwheel against longitudinal displacement. The inner end of the rod is engaged by two headless screws d", which are secured to the member 61 of the clutch and extend through enlarged apertures d formed in the spindle, whereby said rod is permitted a limited o amount of longitudinal movement independently of the spindle. It is hence seen that the engagement or disengagement of the clutch members may be effected by the rotation of the hand-wheel. I

The outer end of the driving-shaft E is con nected by means of suitable gearing with a feed-screw F, Fig. I, which engages the tool= carriage and efiects the feeding movement of same. The engaging pinionfupon said screw is secured upon a sleeve F, which is formed with a friction-clutch member f and is mounted loosely upon the extended end of the screw, as shown in Fig. IV. The outer extremity of said sleeve is provided with a male thread which is engaged by a nut formed upon a hand-wheel F Said nutis provided upon its interior with a thrust-washer f which may be caused to engage a shoulder f formed upon the extended screw end. A second clutch member f is secured to said screw-shaft. The rotation of the hand-wheel may hence be caused to either connect the sleeve with or disconnect it from said shaft E. The extended end of the screw is pro vided with further extension upon which a crankf is secured, as shown. A shoulder f is formed upon the member f upon which is mounted a graduated ringf Fig. V, in a manner such as to provide sufficient frictional contact between ring and shoulder to cause the former to normally rotate with the latter and at the same time permit the ring to be turned by hand independently of its support. Such contact may be provided by a series of friction-washers f secured by screws, such Washers being supported upon the clutch member f, as shown. The contiguous frame portion is preferably beveled and is provided at its top part with a mark, as shown in Fig. V. The graduated ring f is for the purpose of indicating to the operator the distance between the threads to be out upon the worm. After one thread has been cut the ring is moved until the zeromark is in alinement with the mark at the top of the beveled frame, as shown in Fig. V. The shaft F may then be rotated by the crank f each rotation being indicated by the zeromark appearingv at the top in sight of the operator, and each rotation of the shaftF increasing the distance between the threads to be cut. The tool-spindle bearing is also provided with a graduated segment I), which, in conjunction with a pointer 5 supported upon the carriage, Fig. VI, permits of the angular adjustment of the tool to given angles.

The work H is secured at one end to a dog or chuck upon the live-spindle of the headstock, the opposite end being preferably turned down to a bearing and jonrnaled in a bearing provided in a bracket-support J, Fig. I.

An oil-separator K, provided with a flexible pipe 70, whose discharging end is secured to the split bearing b, journaling the rotatable arm I), and discharges upon the tool and is provided for supplying oil to the tool during its operation. I

In the operation of the machine the two clutches are caused to be in operative engagement, whereby the diiferential gear is caused to drive the work at a slow speed and through the medium of the driving-shaft E to operate the feed-screw to impart the'feeding movement to the carriage, the tool Gbeing rapidly and independently driven by the pulley O, the proper inclination having been previously given the tool. By disconnecting the clutch members f and f and turning the crank f it is seen that the carriage may, when desired, be shifted independently of the remainder of the mechanism. By causing such members to engage disconnecting clutch members (1'. and d and turning said crank the work and carriage may be moved together backward and forward independently of the differential gear when desired. When it is desired to out multiple threads upon the worm after completion of the first thread, the clutch members f and f are disconnected, which permit of the movement of the carriage independently of the remainder of the mechanism, as previously described, the work remaining stationaryduringsuchmovement. Priortosueh movement, however, the graduated ringf is turned by hand and independently of the screw-shaft F, so that the zero-mark and the mark upon the contiguous beveled frame portion are in alinement. The shaft may then be turned, carrying with it the ring through the desired angle, as indicated by the graduations, thereby moving the rotary tool to the proper point for cutting the second thread, the number upon said ring indicating the desired angle appearing always at the top, and

hence being convenient and clearly visible. Should a third thread be required upon completion of the second, the ring is again normally operated, as before, and the shaft again turned after the clutch members f and f have been disconnected.

The tool is brought into contact with the work by rotation of the crank Z7 whereby the arm I) may, as before described, be moved longitudinally, as is readily understood, the flexible shaft O permitting such movement.

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as regards the mechanism herein disclosed, provided the means covered by any one of the following claims be employed.

I therefore particularly point out and distinctly claim as my invention 1. In a machine for cutting worm-threads, the combination of a tool-carriage, a screw for feeding same longitudinally of the work, driving means, and a graduated disk mounted upon said screw so as to be rotatable therewith but movable thereon.

2. In a machine for cutting worm-threads, the combination of a tool-carriage, a screw for feeding same, driving means, a clutchmember secured to said screw, and a graduated ring mounted upon the latter so as to be rotatable therewith but movable ind ependently thereof.

3. In a machine for cutting worm-threads, the combination of a tool-carriage, a screw the combination of a tool-carriage, a screw,

for feeding same, driving means, a clutch member secured to said screw and provided with a shoulder, a graduated ring mounted upon such shoulder, and clamping means for securing such ring in place, said means adapted to permit of the movement of the ring upon the clutch member.

5. In a machine for cutting worm-threads, the combination of a tool-carriage, a screw for feeding same, driving means, a clutch member secured to said screw provided with a shoulder and mounted in proximity to the machine-frame, a graduated ring mounted upon said shoulder, the contiguous frame portion provided with a mark cooperating with said ring, and a series of clamps adapted to secure said ring to the clutch member to effect simultaneous rotation and permit of its movement independently of said member.

6. In a machine for cutting worms, the combination of a live spindle, a movable tool-carriage, a rotatable arm mounted in said carriage, the lines-of the spindle and arm-axes lying in the same plane, atool-spindle mounted transversely in the end of said arm, and a tool mounted upon said tool-spindle and having its center lying in said plane.

7. In a machine for cutting worm-threads, the combination of a tool-carriage, a screw for feeding said carriage longitudinally of the work, head-'stock driving means, gearing connectingsaid feed-screw and driving means, means for disconnecting the latter means fromthe head-stock whereby said screw and work may be rotated independently of said head-stock-driving means, and means for driving said tool independently of said head stock-driving means embodying a tool-shaft provided with universal joints.

Signed by me this 20th day of July, 1900.

J. P. BROPHY.

Attest:

D. T. DAVIES, A. E. MERKEL.

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