US705538A - Screw-cutting machine. - Google Patents

Description

No. 705,538. Patented July 22, 1902.

. 11. LAKE & E. w. CRELUN.

SCREW CUTTING MACHINE.

' (Application filed Aug. 5. 1901.)

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No. 705,538. Patented July 22, I902.

D. LAKE 81. E. W; CRELLIN.

SCREW CUTTING MACHINE. (Application filed Aug. 5, 1901J- I (No Mqdel.) 4 Sheets-Sheet 2.

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No. 705,538. Patented July-.22, I902,

o. LAKE & E. w. CRELLIN.

SCREW CUTTING MACHINE. (Application filed Aug. 5, 190i. (No Model.) 4 Sheets-Sheet 3.

Hi nomus PETERS c0.. PHOYO-LITND. wAsmNcrou. 0 c

No. 705,538. "Patented July 22, I902.

11. LAKE & E. w. CRELLIN.

SCREW CUTTING MACHINE.

(Application filed Aug. 5, 1991.)

I 4 Sheets-Sheet 4.

(No Model.)

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UNITED STATES PATENT OFFICE.

DAVID LAKE AND EDWIN W. ORELLIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNORS OF ONE-HALF TO ALVAN MARKLE AND JOHN W. ORELLIN,

OF HAZLETON, PENNSYLVANIA.

SCREW-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 705,538, dated July 22, 1962. Application filed August 5, 1901. Serial No. 70,978. (No model.)

To aZZ whom it may concern.-

Be it known that we, DAVID LAKE and EDWIN W. CRELLIN, citizens of the United States, and residents of Philadelphia, Pennsylvania, have invented certain Improvements in Screw-Cutting Machines, of which the following is a specification.

Our invention relates to certain improvements in screw-cutting machines in which the bar to be threaded is fed to a rotary cutter by means of mechanism operated through the medium of a lead-screw.

The object of ourinvention is to simplify the construction of such a machine, to provide means whereby a screw having two or more threads can be accurately out, and to so construct the head of the machine that a keyway can be readily cut in a rod, as fully described hereinafter.

In the accompanying drawings, Figure l is a side view of our improved screw-cutting machine. Fig. 2 is a plan view. Fig. 3 is a longitudinal sectional view on the line 3 3, Fig. 2. Fig. 4 is an end view. Fig. 5,is an 2 5 enlarged transverse sectional view on the line 5 5, Fig. 1. Fig. 6 is a transverse sectional view on the line 6 6, Fig. 1. Fig. 7 is a sectional plan view on the line 7 7, Fig. 5.

A is the bed-plate of the machine, support- 0 ed on suitable legs A A. On the edgeof the bed-plate is a flange a, which forms a drip-catcher for oil or other lubricant, which is freely used in operating screw-cutting machines. Secured to the bed-plate is an un- 5 dercut slideway B, upon which the carriage D travels and on which the guide E can be adj usted. This slideway extends the full length of the machine in the present instance.

F is a lead-screw running parallel with the slidewayB and mounted ina bearing carried by the end frame G and in a bearing G, secured to the opposite end of the bed-plate of the machine.

His the driving-shaft, mounted in a long bearing G projecting from the frame G. On one end of this shaft H is a belt-pulley h, and on the opposite end is a pinion h. The shaft H is hollow, made so to receive the spindle I, by which the cutter is driven." This spin- 5o dle is splined, and a key on the shaftII enters the spline, so that the spindle will turn with the shaft, but will freely slide longitudinally therein when it is found necessary to adjust the cutter. The shaft H is geared to the lead-screw F through the following train of gears, Fig. 4: The pinion h meshes with a gear-wheel k on a stud H, and on this stud isa pinion 71 which meshes in turn with a gear-wheel h on a stud H and on this stud is a pinion h which meshes with a gear-wheel f carried by a stud F, adjustable on an arm G The arm has a curved slot, as shown, and the stud F can be adjusted in the slot to or from the screw-shaft F, according to the diameter of the gear-wheel f on the shaft F and the gear-wheel f on the stud F, with which the gear-wheel f meshes. By changing the gear-wheel fand adjusting the stud F the screw-shaft can be revolved ata greater or less speed. i

The carriage D, as mentioned above, travels on the slideway B, being driven forward or backward by the lead-screw E. On the carriage is a bearing d for the chuck-spindle J, and on the end of this spindle is a gear-. wheelj, held to the spindle by a nutj. The gear-wheel j meshes with an intermediate wheel 70, carried by two pivoted arms K K, the arm K being pivoted at k, at the side of the bearing d, and the other arm K is pivoted So at 70 above the bearing, as illustrated in Fig. 5. These two arms K K are slotted and can be secured in their adjusted positions by means of abolt 7t and nut7c The gear-wheel 70 is mounted on the bolt 70 being held to the bolt by a nut 70*. The intermediate Wheel 7c meshes with a pinion Z on a sleeve L, loose on the screw F. This pinion Z is keyed to the sleeve and is held in place by a nut Z. By the above-described construction the sleeve L can be driven at any speed desired by simply changing the intermediate wheel 7.; and the wheel j, the slotted arms forming an adj ustable bearing for the spindle of the wheel 7a. In order to prevent the sleeve moving longi- 5 tudinally independent of the carriage D, we mount on the carriage a forked arm L", which rests in an annular groove in the sleeve L, as shown in Figs. 5 and 7.

On the sleeve L is a pinion 1 which may 10o be used in connection with a second gearwheel on the stud 10 when it is desired to change the speed of the sleeve L to a greater extent than by the train of gears described above.

L is a second sleeve, having a key Z which enters a spline fin the lead-screw F. This spline preferably extends from one end of the screw to the other.

The two sleeves L and L are flanged, as shown, and passing through the flanges is a tapered pin Z, which confines the sleeve L to the sleeve L, so that when the shaft F is turned both sleeves must turn with the shaft, and thus motion is imparted to the chuckspindle J through the train of gears above described.

M is a clutch mounted on the carriage D and has two jaws m m, which can be moved toward and from the screw F by a cam-disk m, carried by the shaft m having an operating-wheel. This form of clutch is common in machine-tool practice, where it is desired to throw a carriage or slide into and out of control of the leadscrew.

On the end of thespindle J is an ordinary form of split chuck 7' having a tapered periphery, which is threaded, and on the chuck is a nutj When this nutis turned, the jaws can be drawn tightly on the rod upon which the thread is to be out.

By constructing the parts in the manner described, so that the sleeve L can be turned independently of the lead-screw, the carriage can be moved forward or backward to a limited extent, so that two or more threads can be cut on a rod by simply shifting the carriage. If it is desired to cut a double thread on a rod, for instance, the cutter is set at the desired angle, and the feed mechanism of the carriage is arranged so that when the machine is set in motion a single thread will be cut with a space wide enough so that when the rod is turned one half-turn the cutter will be in line with the space. This is accomplished by simply withdrawing the pin Z and turning the sleeve L one full turn, then inserting the pin Z so as to lock the two sleeves together. By turning the sleeve L the chuck-spindle J is turned, and with it the rod upon which the thread is to be cut. The cutting operation is repeated and the second thread out upon the rod.

The flanges of the sleeves L L may have indexed perforations at intervals, so that the machine can be set to cut any number of flanges on a single rod or bar.

We will now describe the carrier for the cutter-head, which is situated at one end of the machine.

Depending from the bed of the machine is a large stud G. This stud in the present instance passes through an opening in the bed plate A and is screwed into the slideway B. Thus the stud is firmly held to the bed of the machine.

P is a carrier mounted on the stud O. The

lower portion of the carrier P is in the 'form of a split bearing, the bearing being clamped tightly to the stud by means of a set-screw 19, Fig. 1, so that when the carrier is adjusted in position it may be fixed rigidly to the bed of the machine. Secured to the stud C is a disk 0. This disk in the present instance is held in place by a bolt 0 and prevented from turning by a pin 0 We preferably provide the carrier P with an index-finger p and graduate the periphery of the disk 0. Thus the operator can readily adjust the carrier to the proper angle to cut a screw of the pitch desired. The upper end of the carrier is in the form of a slideway P, and mounted on this slideway is a head R. The position of this head is regulated by a screw 1", provided with a hand-wheel r, so that on turning the hand-wheel the head may be raised or lowered. WVe graduate the hub of the'handwheel r and place an index-finger on the bearingp for the screw-shaft r, so thatwhen the said screw-shaft is turned the amount of movement given to the head R is clearly indicated.

Carried by the head R are two bearings R in the present instance, and mounted in these hearings is a cutter-shaft S. This cutter-shaft carries at one end a cutter s, which is mounted so as to be directly in line with the center of rotation of the carrier on its axis 0. No matter in what position the car rier is adjusted the cutter will always be on this center line. The shaft S is threaded at its outer end, and on this threaded portion is a coupling-nut I, which is connected to a rod I by a universal joint 2', and the rod 1 is coupled to the rod I bya universal joint 41. The rod 1, as before remarked, is keyed to the driving-shaft H, but in such a'manner that it can slide longitudinally in the shaft when it is necessary to adjust the head R or the carrier P. On the cutter-shaft, in the present instance is a bevel-wheel s, which meshes with a bevel-wheel s on a short shaft 3 projecting at right angles to the shaft S. The outer end of this shaft 5 is threaded, so that the coupling 1 can be-readily secured to it when the carrier is shifted to bring the cutter-shaft at right angles to the line of travel of the work. When the carrier is adjusted to this position, the coupling 1 is detached from the shaft S and coupled to the shaft 8 as indicated in dotted lines in Fig. 2. The cutter can then be used to cut a spline or keyway in the shaft which has been pre- .viously threaded, or a cut may be made in a plain shaft, if desired. The machine can be used not only as a screw-cutting machine, but also to a certain extent as a keyway and spline cutter.

In order to hold the rod or bar to its work while the cutter is cutting the thread, we mount a guide E on the slideway B, Figs. 1, 3, and 6, and this guide can be adjusted 1ongitudinally on the slideway by means of a set-screw c, Fig. 1, so as to move it to either side of the cutter s. The slide is usually in the position shown in the figures of the drawings when an ordinary. thread is to be out; but when it is desired to cut to a shoulder or head then the guide is moved to the opposite side of the cutter, so that the cut portion of the rod will rest in the guide. The guide has two transverse slides E, controlled by an adjusting-screw 6, having a right and left hand thread, so that when the screw is turned the slides will be moved toward or from each other. Carried by the slides E are jaws e held in place by bolts 6 These jaws in the present instance are V-shaped, so as to properly grasp a cylindrical rod or tube.

V The operation of the machine is as follows: If the parts are in the position shown in Fig. 1, the rod or tube to be cut is secured in the chuck-spindle J and in position under the cutter s, which has been set to the desired angle and clamped. Motion is then imparted to the carriage D through the screw-shaft and the driving-gear from the driving-shaft H, and as the lead-screw is turned the carriage will be moved forward at a certain speed, according to thearrangement of the gearing at the end of the machine, and the clutch-spindle and the rod will be turned according to the arrangement of the gears on the carriage, and as the work is fed to the cutter the cutter is rotated by the driving mechanism 1 1'1" and the thread is cut on the rod. If the rod has a shoulder or head and it is desired to cut up to the head, then when the cutter reaches a point near the head the guide E is shifted to the opposite side of the cutter, so that the cutter can cut the thread up to the shoulder. If it is desired to cut two or more threads on a rod, so as to make it a double or triple threaded screw, then the cutter-carrier is so set as to make the pitch of the thread steep, and the gearing is changed so that the speed of the carriage will 'be increased, and when one thread is cut the sleeve L is turned, as remarked above, so as to turn the rod independently of the screw, so that the cutter will be in position between the grooves previously cut, and when the parts are locked the cutter will cut a second thread between the grooves of the preceding thread.

It will thus be seen that a machine built in accordance with our invention is simplein construction, can be used to cut a single thread on a rod or tube, or can be used to out two or more threads, if desired, and the machine can be used to cut a keyway or spline in a shaft or in a screwrod, if desired.

We claim as our invention- 1. The combinationin a screw-cutting machine, of a bed, a slideway thereon, a carriage mounted on said slideway, a chuck-spindle on the carriage to which the work is secured, a longitudinally-arranged lead-screw on the bed, a clutch on the carriage engaging said lead-screw, a sleeve on the screw and carried by the carriage, said sleeve having a key entering a spline in the lead-screw and geared to the chuck-spindle, and a cutter mounted to cut a thread on the rod as it is fed forward by the lead-screw, substantially as described.

2. The combination in a screw-cutting ma chine, of a bed, alongitudinal keyway therein, a longitudinal lead-screw parallel thereto, gearing for driving said lead-screw, a carriage and a chuck-spindle both driven by said leadscrew, a carrier pivoted to the bed, a cuttershaft mounted on the carrier, a cutter mounted on said shaft in the pivotal line of the carrier, a stud upon which the carrier is mounted, and means for driving the cutter shaft, substantially as described.

3. The combination of a bed, a carrier pivoted to one end of the bed, a cutter-shaft having its hearings in said carrier, a cutter there on, a hollow driving-shaft at the opposite end of the bed, a splined driving-rod mountedin the hollow shaft and keyed thereto, a universal coupling connecting the said driving-rod to the cutter-shaft, a carriage, a lead-screw, gearing by which the lead-screw is driven from the driving-shaft, and gearing by which the chuck-spindle on the carriage is driven from the lead screw, substantially as described.

4. The combination in a screw-cutting machine of means for feeding a rod, a pivoted carrier, a cutter-shaft mounted in hearings in said carrier, a cutter on said shaft, means connected to the shaft for driving said outter, said carrier being capable of adjustment on its pivot so that the cutter-shaft will be at right angles to the line of the Work, and auxiliary mechanism for coupling said cutter shaft to the driving mechanism when said shaft is in its adjusted position, substantially as described.

5. The combination of a bed, a pivoted carrier mounted on one end of the bed, a head, means for vertically adjusting said head, a cutter-shaft on said head, a cutter, driving mechanism at the opposite end of the machine, the driving mechanism consisting of three rods coupled together by universal joints, one of said rods being connected to the cutter-shaft, and means for feeding the work to the cutter, substantially as described.

6. The combination of a bed, a frame at one end of the bed, a driving-shaft mounted in saidframe, a carrier pivoted to the opposite end of said bed, a cutter-shaft mounted on the carrier, a cutter thereon, a longitudinal guideway, a longitudinal lead-screw, said screw being mounted in a bearing on one end of the machine and in the frame at the opposite end of the machine, a train of changegears by which the lead-screw is driven from the driving shaft, a carriage on the guideway, a chuck on the carriage engaging the lead screw and by which the carriage is moved toward or from the Work, a hollow spindle on the carriage to which the work is clutched,

IIO

by said head, said cutter being mounted in line with the pivot of the carrier, substantially as described.

In testimony whereof We have signed our 1 5 names to this specification in the presence of two subscribing Witnesses.

DAVID LAKE. EDWIN W. ORELLIN. Witnesses:

WILL. A. BARR, J 0s. H. KLEIN.

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