US675834A - Screw-cutting machine. - Google Patents

Screw-cutting machine. Download PDF

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Publication number
US675834A
US675834A US2789800A US1900027898A US675834A US 675834 A US675834 A US 675834A US 2789800 A US2789800 A US 2789800A US 1900027898 A US1900027898 A US 1900027898A US 675834 A US675834 A US 675834A
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United States
Prior art keywords
screw
shaft
cutter
carriage
rod
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US2789800A
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David Lake
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EDWIN W CRELLIN
JOHN LEISENRING
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EDWIN W CRELLIN
JOHN LEISENRING
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23GTHREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G1/00Thread cutting; Automatic machines specially designed therefor
    • B23G1/32Thread cutting; Automatic machines specially designed therefor by milling
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/51Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5104Type of machine
    • Y10T29/5109Lathe
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/51Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5104Type of machine
    • Y10T29/5109Lathe
    • Y10T29/5113Commutator
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00Gear cutting, milling, or planing
    • Y10T409/30Milling
    • Y10T409/300056Thread or helix generating
    • Y10T409/300672Thread or helix generating with means to rotate work and means to interrelatedly infeed the work relative to the cutter
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00Gear cutting, milling, or planing
    • Y10T409/30Milling
    • Y10T409/300056Thread or helix generating
    • Y10T409/300784Thread or helix generating with means to circumferentially adjust the position of the cutter with respect to the work

Definitions

  • Patented lune 4
  • the object of my invention is to so construct a machine for cutting screw-threads that the'thread can be cut on a bar of any length and of any diameter in a continuous operation and the thread can be cut on any pitch desired.
  • Fig. i is a plan view.
  • Fig. 3 is a plan View of the cutting end of themachine, showing the cutter in the act of cutting a screw on the bar.
  • Fig. 4L is a longitudinal sectional view on the line 4 et
  • Fig. 3 is a longitudinal sectional view on the line 4 et
  • Fig. 3 is a longitudinal sectional view on the line 4 et
  • Fig. 3 is a longitudinal sectional view on the line 4 et
  • Fig. 3 is a longitudinal sectional view on the line 4 et
  • Fig. 3 is a longitudinal sectional view on the line 4 et
  • Fig. 3 is a longitudinal sectional view on the line 4 et
  • Fig. 3 is a longitudinal section
  • A is a hollow standard mounted on a suitable foundation so that it will be rigid.
  • a d are guides for the vertically-adjustable bed-carrying piece B.
  • This piece has portions h h, which conform to the guides, and has an extension b', which enters a vertical slot a in the standard, so that the piece Il is free to slide vertically on the standard.
  • a bed-plate B' Oarried by the piece B is a bed-plate B'. This bed-plate extends rearward and carries the rear portion of thc machine.
  • a bracket B2 stiffens the bed, as it will be understood that the bed must be rigidly supported and capable of vertical adjustment.
  • O is a shaft which can be provided with a suitable handle, and on this shaft is a bevel- Wheel c, gearing with the bevel-wheel c on a vertical shaft C'.
  • the lower end of the vertical shaft Cl is threaded and passes through a nut o2 on a bracket a2, projecting from the standard, so that on turning the shaft C the threaded shaft C will turn in the nut and will either raise or lower the bed B.
  • the shaft C may be provided with a hand, and on the frame may be placed a dial, as shown in Fig. 5, to indicate the extent of movement.
  • D is the hollow screw-threaded carrier for the rod on which the thread is to be cut.
  • This threaded carrier has its forward bearing in a carriage D@ having guides d d, traveling on guideways E E, supported on each side of the machine by brackets E', which are bolted to the bed-plate B.
  • the rear of the screwthreaded carrier travels through a nut fin the rear bearing F, as clearly shown in Figs. l and 2.
  • On the front of the carriage D is a chuck D2, having jaws d. These jaws are arranged to grasp the rod on which the thread is to be cut and clamp it securely to the carriage, so-that it will be fed at a given speed according to the pitch ot' the thread and the depth of cut desired.
  • G is the carrier for the cutting-tool and its drivingmechanism.
  • Thiscarrier isconstructed as follows:
  • the carrier has two segmental arms g g, which rest on the upper portion of the standard A, and the arms are slotted at g.
  • Bolts g2 pass through the slots into the standard and secure the carrier in its adjusted position.
  • I preferably form a rib a3 on the standard and groove the under side of the arms g of the carrier.
  • the rib is on a radius taken from the center of the cutting-line of the tool.
  • I is the cutting-tool shaft, and i is the cutting-tool.
  • This tool in the present instance is of the form clearly shown in Fig. 3, having a series of cutting-teeth on its periphery.
  • the cutter inthe present instance is so formed as to cut a thread with one side vertical and the other side beveled; but it will be understood that any form of thread maybe cut, according to the shape of the cutting-tool, the position of the tool, and the feed of the bar.
  • the shaft I is mounted in bearings G, as clearly shown in Fig. 4.
  • the bearings are preferably bushed, and the shaft I has a screw-threaded portion z", on which are nuts 2, so as to take up for any lost motion when desired.
  • the cutter t is held to the spindle by a nut t3 in the ordinary manner.
  • a spiral gear-wheel I' Keyed to the spindle is a spiral gear-wheel I', and meshing with this is a Second spiral gear- Wheel h on the driven shaft H, mounted in IOO bearings h on the carrier G.
  • This shaft is driven by a belt which passes over a beltpulley h2 from a belt-pulley h3 on a shaft Il, mounted in bearings in the bracket G2, depending from the carrier G.
  • the shaft is also mounted in bearings H2, swiveled on a vertical shaft H3, having its bearings (t4 on a fixed portion of the standard.
  • the vertical shaft 113 has a double gear-wheel 7L", or two bevel gear-wheels may be placed back to back, if desired.
  • One of the gear-wheels h4 meshes with the bevel gear-wheel h5 on the shaft II, while the other meshes with a gearwheel 7L6 on the driving-shaft H, mounted in suitable bearings in the standard.
  • This d riving-shaft has a cone-pulley h7 for changing the speed of the driving mechanism.
  • the vertical shaft Il3 is on a vertical line around which the carrier Gis adjusted-namely,thelinedrawn through the center of the cutter y[-so that no matter what position the carrier G is in the drivingshaft H4 will always be in gear with the shaft H and will drive the cutter through the shaft II and cutter-spindle I.
  • I provide two sets of jaws J and K.
  • the bearing portions of each set of jaws are V- shaped, so as to hold the work firmly, preventing it from moving out of line, yet allowing it to pass freely through the jaws when fed forward by the feed mechanism.
  • the jaws J are arranged forward of the tool and the jaws K are arranged back of the tool.
  • the jaws K are only used when it is desired to cut a thread on a rod up to thel chuck. Then the jaws J are moved out', so as to clear the chuck, while the jaws K are moved into position to guide the rod.
  • the adjusting-screw J2 has a head to which a key can be applied, while the screw K2 is geared to a spindle if at right angles to the screw, aud this spindle is provided with a head, so that a key can be applied.
  • This construction is necessary, as the adjustable carrier G for the tool will not allow for the application of a key to the end of thc shaft K2.
  • a clearing-tool Il mounted between the two sets of jaws J aud K is a clearing-tool Il. This tool enters the groove between thc threads of the screw immediately after the cutter has cut the groove, so as to finish and clean the thread.
  • This cutter is of the peculiar form shown in Fig. 5, being mounted on acarriage L, moved toward and from the rod being cut by a screw Z, mounted in a bearing L2, secured to the bedplate B, as shown in Fig. 5.
  • the hollow screw-rod D is journaled to the carriage D.
  • the construction of the coupling is clearly shown in Fig. 4.
  • a tubular section D3 is mounted in the bearings of the carriage D, and a coupling D4 couples the tubular screw D to the section D3, so that the carriage D is fed forward as the screw D revolves.
  • the spindle D5 of the chuck D2 is hollow and extends through the tubular section D, as clearly shown in Fig. 4.
  • spindle has a shoulder at one end and is threaded at the opposite end for the reception ofthe confining-nuts.
  • a gear-wheel d? On the spindle of the chuck is keyed a gear-wheel d?, which is geared through a gear-wheel (Z3, secured to a sleeve d4, splined to au intermediate wheel with a shaft M.
  • the shaft )I turns the chuck at the proper speed, and with it the rod to be cut, while the screw-spindle D is fed forward, so that by feeding the screw-spindle D forward and turning the shaft M at a given speed, according to the pitch desired, and setting the cutter at an angle to agree with the pitch a screw-thread will be cut accurately upon the rod.
  • a worm-wheel n On the shaft lI is a worm-wheel n, which gears with a worm n. on a short shaft N.
  • This shaft is coupled to a shaft N by a gimbal-joint n2, and the shaft N is coupled by another gimbal-joint n3 to a short shaft N2, having its bearings in the frame F at the end of the machine, as clearly shown in Fig. G.
  • the shaft N"2 has agcar-wheel j), which meshes with an intermediate wheel p' on a stud p2, mounted in the frame F, and this intermediate wheel meshes with a gear-wheel 193 on thc hollow spindle D.
  • the wheel p meshes with a gearwheel p", carried by a stud 19"', on which is a pinion [1, which meshes with a wheel m on the shaft M.
  • the spindle p is carried by a pivotcd arm P, which can be locked in different positions by a bolt jfl', which rests in a slot in the arm. This is the same construction as an ordinary back gear ou a lathe.
  • the gear-wheel p3 is held in position by the bearing F and a yoke Q, which is dctachably secured to a bracket on the base, Figs. (i and S.
  • the nutf can be thrown into and out of mesh with the threads of the spindle D by a lcverf, asthenutfisahalf-nutaud mounted in guides in the frame F.
  • On one of the guideways E is a rack S, and mounted on the bear- IOO IIO
  • ing s on the carriage is a shaft s', having a gear-wheel Q?,which meshes with the rack, and this wheel is turned by a handle s, so that when it islwished to move the carriage forward or back by hand the lever f is operated to throw the nutfout of mesh with the screwspindle D. Then the carriage, with its spindle, can be moved toward or from the cutter by operating the handle s3; but when it is wished to feed the carriage forward by power the leverf is operated to throw in the nutf in mesh with the screw-spindle I), and the carriage can be fed forward by power.
  • the chuck D2 may be of any ordinary type, so formed that a key can be used to clutch the jaws to the rod.
  • the chuck is operated so as to rmly grasp the rod as it is fed to the cutting-tool, and the jaws J J are so set that the rod will pass between the jaws without vibration, the jaws steadying it against the cutting action of the cutting-tool, and if the machine has a hollow screw-spindle D of such a length that it can feed forward, say, four feet of the rod at one operation the chuck need not be released until a thread four feet long is eut upon the red.
  • the machine is able to cut a thread very quicklyand accurately on any length of rod, and when it is desired to work up to the head-*for instance, as on a bolt-the jaws J J are backed olf and the jaws K K are set to guide the rod, so as to allow the chuck to come up to the cutting-tool.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)

Description

No. 675,834. Patented June 4, I90I. D. LAKE.
SCREW CUTTING MACHINE.
6 Sheets-Shoot I.
(Application ledAug. 24, 1900.)
oOo
(llo Model.)
No. 675,834. Patented lune 4, l90l'. D. LAKE. scnEw crrma uAcHmE;
(Lpphcationbd Aug 24 1900) 6 Sheets-Sheet 2.
(lo Model.)
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SCREW CUTTING MACHINE..
(Applicivn Mad A 94, 1900.) (No Model.) s 6 Sheets-Sheet 3.
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No. 675,834. Patented lune 4, |901. D. LAKE.
SCREW CUTTING MACHINE.
(Application led Aug. 24, 1900.)
6 Sheets-Shack 4.
(N0 Model.)
1 l i I l l l No. 675,834. Patented lune 4, I90I. D. LAKE.
SCREW CUTTING MACHINE.
- (Application Bled Aug. 24, 1900.) (lo Model.) 6 Sheets-Sheet 5.
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(No Model.)
Patented lune 4, |90I. D. LAKE.
SCREW CUTTING MACHINE.
(Applicntion led Aug. 24, 1900.)
6 Sheets-Sheet 6.
UNITED STATES PATENT OEEICE.
DAVID LAKE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF THREE- FOURTHS TO EDWIN IV. CRELLIN, OF SAME CPLACE, AND JOIIN LEISEN- RING, OF UPPER LEIIIGII, PENNSYLVANIA.
SCREW-CUTTING MACHINE.
SPECIFICATION forming part of Letters Patent No. 675,834, dated June 4, 1901.
Application tiled August 24, 1900. Serial No. 27,898. (No model.)
T0 all whom it may concern:
Be it known that I, DAVID LAKE, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Screw-Cutting Machines, of which the following is a specification.
The object of my invention is to so construct a machine for cutting screw-threads that the'thread can be cut on a bar of any length and of any diameter in a continuous operation and the thread can be cut on any pitch desired. This object I attain in the following manner, reference being had to the accompanying drawings, in which-- Figurelisasideview of myimprovcd screwcutting machine. Fig. i is a plan view. Fig. 3 is a plan View of the cutting end of themachine, showing the cutter in the act of cutting a screw on the bar. Fig. 4L is a longitudinal sectional view on the line 4 et, Fig. 3. Fig. 5 is a vertical sectional view on the line 5 5, Fig. et. Fig. 6 is an end view of the machine. Fig. 7 is a section on the line 7 7, Fig. 4; and Fig. 8 is a section on lthe line 8 8, Fig. (5.
A is a hollow standard mounted on a suitable foundation so that it will be rigid.
a d are guides for the vertically-adjustable bed-carrying piece B. This piece has portions h h, which conform to the guides, and has an extension b', which enters a vertical slot a in the standard, so that the piece Il is free to slide vertically on the standard. Oarried by the piece B is a bed-plate B'. This bed-plate extends rearward and carries the rear portion of thc machine. A bracket B2 stiffens the bed, as it will be understood that the bed must be rigidly supported and capable of vertical adjustment.
I will rst explain the means for adjusting the hed.
O is a shaft which can be provided with a suitable handle, and on this shaft is a bevel- Wheel c, gearing with the bevel-wheel c on a vertical shaft C'. The lower end of the vertical shaft Cl is threaded and passes through a nut o2 on a bracket a2, projecting from the standard, so that on turning the shaft C the threaded shaft C will turn in the nut and will either raise or lower the bed B. The shaft C may be provided with a hand, and on the frame may be placed a dial, as shown in Fig. 5, to indicate the extent of movement.
D is the hollow screw-threaded carrier for the rod on which the thread is to be cut. This threaded carrier has its forward bearing in a carriage D@ having guides d d, traveling on guideways E E, supported on each side of the machine by brackets E', which are bolted to the bed-plate B. The rear of the screwthreaded carrier travels through a nut fin the rear bearing F, as clearly shown in Figs. l and 2. On the front of the carriage D is a chuck D2, having jaws d. These jaws are arranged to grasp the rod on which the thread is to be cut and clamp it securely to the carriage, so-that it will be fed at a given speed according to the pitch ot' the thread and the depth of cut desired.
G is the carrier for the cutting-tool and its drivingmechanism. Thiscarrier isconstructed as follows: The carrier has two segmental arms g g, which rest on the upper portion of the standard A, and the arms are slotted at g. Bolts g2 pass through the slots into the standard and secure the carrier in its adjusted position. I preferably form a rib a3 on the standard and groove the under side of the arms g of the carrier. The rib is on a radius taken from the center of the cutting-line of the tool.
I is the cutting-tool shaft, and i is the cutting-tool. This tool in the present instance is of the form clearly shown in Fig. 3, having a series of cutting-teeth on its periphery. The cutter inthe present instance is so formed as to cut a thread with one side vertical and the other side beveled; but it will be understood that any form of thread maybe cut, according to the shape of the cutting-tool, the position of the tool, and the feed of the bar.
The shaft I is mounted in bearings G, as clearly shown in Fig. 4. The bearings are preferably bushed, and the shaft I has a screw-threaded portion z", on which are nuts 2, so as to take up for any lost motion when desired. The cutter t is held to the spindle by a nut t3 in the ordinary manner. Keyed to the spindle is a spiral gear-wheel I', and meshing with this is a Second spiral gear- Wheel h on the driven shaft H, mounted in IOO bearings h on the carrier G. This shaft is driven by a belt which passes over a beltpulley h2 from a belt-pulley h3 on a shaft Il, mounted in bearings in the bracket G2, depending from the carrier G. The shaft is also mounted in bearings H2, swiveled on a vertical shaft H3, having its bearings (t4 on a fixed portion of the standard. The vertical shaft 113 has a double gear-wheel 7L", or two bevel gear-wheels may be placed back to back, if desired. One of the gear-wheels h4 meshes with the bevel gear-wheel h5 on the shaft II, while the other meshes with a gearwheel 7L6 on the driving-shaft H, mounted in suitable bearings in the standard. This d riving-shaft has a cone-pulley h7 for changing the speed of the driving mechanism.
It will be noticed that the vertical shaft Il3 is on a vertical line around which the carrier Gis adjusted-namely,thelinedrawn through the center of the cutter y[-so that no matter what position the carrier G is in the drivingshaft H4 will always be in gear with the shaft H and will drive the cutter through the shaft II and cutter-spindle I.
In order to steady the work at the cutter, I provide two sets of jaws J and K. The bearing portions of each set of jaws are V- shaped, so as to hold the work firmly, preventing it from moving out of line, yet allowing it to pass freely through the jaws when fed forward by the feed mechanism. The jaws J are arranged forward of the tool and the jaws K are arranged back of the tool. The jaws K are only used when it is desired to cut a thread on a rod up to thel chuck. Then the jaws J are moved out', so as to clear the chuck, while the jaws K are moved into position to guide the rod. Ey this arrangement the major portion of the rod on which the thread is cut is not in contact with any bearing-surface, as the jaws J guide the rod just prior to its being cut, and it is only when the jaws K are in position that the rod is guided by its threaded portion. Each of thejaws is mounted on carriers J and K, respectively, and these carriers are supported on suitable bearings secured to the bed 13 of the machine. The jaws are moved toward and from the center of the rod to bc cut by ordinary adjusting screws .l2 and K2, respectively. The adjusting-screw J2 has a head to which a key can be applied, while the screw K2 is geared to a spindle if at right angles to the screw, aud this spindle is provided with a head, so that a key can be applied. This construction is necessary, as the adjustable carrier G for the tool will not allow for the application of a key to the end of thc shaft K2.
Mounted between the two sets of jaws J aud K is a clearing-tool Il. This tool enters the groove between thc threads of the screw immediately after the cutter has cut the groove, so as to finish and clean the thread. This cutter is of the peculiar form shown in Fig. 5, being mounted on acarriage L, moved toward and from the rod being cut by a screw Z, mounted in a bearing L2, secured to the bedplate B, as shown in Fig. 5.
I will now refer again to the mechanism for feeding a rod to the cutter. As before remarked, the hollow screw-rod D is journaled to the carriage D. The construction of the coupling is clearly shown in Fig. 4. A tubular section D3 is mounted in the bearings of the carriage D, and a coupling D4 couples the tubular screw D to the section D3, so that the carriage D is fed forward as the screw D revolves. The spindle D5 of the chuck D2 is hollow and extends through the tubular section D, as clearly shown in Fig. 4. The
spindle has a shoulder at one end and is threaded at the opposite end for the reception ofthe confining-nuts. On the spindle of the chuck is keyed a gear-wheel d?, which is geared through a gear-wheel (Z3, secured to a sleeve d4, splined to au intermediate wheel with a shaft M. The shaft )I turns the chuck at the proper speed, and with it the rod to be cut, while the screw-spindle D is fed forward, so that by feeding the screw-spindle D forward and turning the shaft M at a given speed, according to the pitch desired, and setting the cutter at an angle to agree with the pitch a screw-thread will be cut accurately upon the rod.
In order to feed the hollow screw-spindle forward and to drive the shaft M, I use the following gearing, referring to Figs. l, 2, 6, and S: On the shaft lI is a worm-wheel n, which gears with a worm n. on a short shaft N. This shaft is coupled to a shaft N by a gimbal-joint n2, and the shaft N is coupled by another gimbal-joint n3 to a short shaft N2, having its bearings in the frame F at the end of the machine, as clearly shown in Fig. G. The shaft N"2 has agcar-wheel j), which meshes with an intermediate wheel p' on a stud p2, mounted in the frame F, and this intermediate wheel meshes with a gear-wheel 193 on thc hollow spindle D. The wheel p meshes with a gearwheel p", carried by a stud 19"', on which is a pinion [1, which meshes with a wheel m on the shaft M. The spindle p is carried by a pivotcd arm P, which can be locked in different positions by a bolt jfl', which rests in a slot in the arm. This is the same construction as an ordinary back gear ou a lathe. Ey changing the gears p p p3 the speed of the carriage forward can be regulated, and by changing the gears p1, p", and m the speed of the shaft M can be regulated. The gear-wheel p3 is held in position by the bearing F and a yoke Q, which is dctachably secured to a bracket on the base, Figs. (i and S. The nutf can be thrown into and out of mesh with the threads of the spindle D by a lcverf, asthenutfisahalf-nutaud mounted in guides in the frame F. On one of the guideways E is a rack S, and mounted on the bear- IOO IIO
ing s on the carriage is a shaft s', having a gear-wheel Q?,which meshes with the rack, and this wheel is turned by a handle s, so that when it islwished to move the carriage forward or back by hand the lever f is operated to throw the nutfout of mesh with the screwspindle D. Then the carriage, with its spindle, can be moved toward or from the cutter by operating the handle s3; but when it is wished to feed the carriage forward by power the leverf is operated to throw in the nutf in mesh with the screw-spindle I), and the carriage can be fed forward by power. The chuck D2 may be of any ordinary type, so formed that a key can be used to clutch the jaws to the rod.
It will be seen that I simply use a tool to cnt one portion of the rod at a time and turn the rod and feed it to the cutter as the cutter rotates, and with one cut I finish the thread. l do not require two or three sets of dies or sets of cutters. The finishing-tool which follows the cutis simply for the purpose of cleaning the thread after the cutter. Furthermore, it will be seen that by having the tubular chuck and screw-spindle D, I can thread a rod of any length, and by having the jaws at the cutter the machine can be made compact and sections of the rod can be cut at intervals.
The chuck is operated so as to rmly grasp the rod as it is fed to the cutting-tool, and the jaws J J are so set that the rod will pass between the jaws without vibration, the jaws steadying it against the cutting action of the cutting-tool, and if the machine has a hollow screw-spindle D of such a length that it can feed forward, say, four feet of the rod at one operation the chuck need not be released until a thread four feet long is eut upon the red. Then all thatis necessaryis to clamp the jaws J J to the rod by turning the adjustingscrews, releasing the chuck and backing it olf by means of the rack and pinion, and then attaching the clutch again to the rod and backing olf the jaws J J slightly, and the cutter can proceed with the work of cutting the thread at the point where itpreviously stopped.
I have found by experience that the thread is continuous and the marks do not show where one section of thread stops and another begins.
The machine is able to cut a thread very quicklyand accurately on any length of rod, and when it is desired to work up to the head-*for instance, as on a bolt-the jaws J J are backed olf and the jaws K K are set to guide the rod, so as to allow the chuck to come up to the cutting-tool.
l claim as my inventionl. The combination in a screw-threading machine, of a hollow-threaded carrier for the blank upon which a thread is to be eut, means for feeding the carrier laterally, means for turning the blank, a cutter, an adjustable carrier therefor and means for operating the cutter, substantially as described.
2. The combination in a screw-cutting machine, of ahollowcarrier for the blank, means for rotating the carrier, means for rotating the blank independently of the carrier, a cutter, and means for rotating the cutter, substantially as described.
3. The combination in a screw-cutting machine, of a carriage, a hollow feed-screw for feeding the carriage and through which the blank is passed, a chuck on the carriage engaging the blank, means for turning the chuck independently of said hollow feed-screw, and a cutter, substantially as described.
4. The combination in a screw-cutting machine, of a carriage, a hollow feed-screw for the carriage, a chuck on the carriage, a cutter, driving mechanism for the cutter, and mechanism for feeding and other mechanism for turning the blank, substantially as described.
5. The combination in a screw-cutting lnachine, of a standard, a cutter carried by the standard, means for rotating the cutter, a bed vertically adjustable on thc standard, and a hollow tubular carrier for the blank to be eut, said carrier being mounted on the bed, substantially as described.
G. The combination in a screw-cutting machine, of a standard, an adjustable carrleron the standard, a cutter carried by the standard, a vertically-adjustable bed, guides thereon, a carriage on said guides, a hollow feedscrew for the carriage, a chuck for the blank mounted on the carriage, and means for rotating the chuck and fo' rotating the feedscrew, substantially as described.
7. The combination in a screw-machine, of a standard, a bed thereon, a carriage for the blank mounted on said bed, means for feeding the carriage and for turning the blank, an adjustable carrier for the cutter, a vertical driving-shaft on a line with the cutter, and mechanism between the said shaft and the cutter-shaft, substantially as described.
8. The combination in a screw-cnttingmachine, of a standard, a bed vertically adjustable on the standard, a carriage on the bed, a chuck for the blank on the carriage, a long hollow feed-screw coupled to the carriage, a nut on the bed, means for turning the screw and for revolving the chuck, and a cntteron the standard, substantially as described.
i). The combination in a screw-cutting machine, of a cutter, means fordriving the same, a bed, a carriage on said bed, a hollow feedscrew for the carriage, a chuck for engaging the blank, a shaft running parallel with thc feed-screw, and means for turning the shaft and the feedscrew, substantially as dcscribed.
l0. The combination in ascrew-cutting machine, of a cutter, driving means therefor, a
IIO
carriage, a, hollow feed-screw connected tol In testimony whereof I have signed my said Carriage, a chuck journaled in the carllame t0 this specification in the presence of lo ringe in line with the feed-screw, a drivingtwo subscribing Witnesses.
shaft for the chuck, a train of gears fordi'iving both the shaft and the feed-screw, and a DAVID LAKE' shaft coupling the train of gears t0 the cutfitnessesz ter-driving mechanism, substantially :1 -s de- XVILL. A. BARR,
scribed. JOS. IT. KLEXN.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2775167A (en) * 1952-09-29 1956-12-25 Waldrich Werkzeugmasch Machining of long work-pieces
US20050186673A1 (en) * 1995-02-22 2005-08-25 Ed. Geistlich Soehne Ag Fuer Chemistrie Industrie Collagen carrier of therapeutic genetic material, and method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2775167A (en) * 1952-09-29 1956-12-25 Waldrich Werkzeugmasch Machining of long work-pieces
US20050186673A1 (en) * 1995-02-22 2005-08-25 Ed. Geistlich Soehne Ag Fuer Chemistrie Industrie Collagen carrier of therapeutic genetic material, and method

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