US700980A - Electric sawing-machine. - Google Patents

Description

No. 700,980. Patented May 27, 1002.

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ELECTRIC SAWING MACHINE.

(Application filed Nov. 2; 1901.)

3 Sheets-Sheet I.

(No lllod el.)

No. 700,980. Patented New 27, I902.

' C. PARTINGTON,

Lemme SAWING MACHINE (Application filed Nev. 2. 1901.)

all Ill/Ill] No. 700,980. Patented May 27, I902.

C. PARTINGTON.

ELECTRIC SAWING MACHINE.

(Applieltion filed Nov. 2, 1901.)

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UNITED STATES PATENT OFFICE.

CHARLES PARTINGTON, OF NEWPORT, KENTUCKY, ASSIGNOR TO THE WEIR FROG COMPANY, OF CINCINNATI, OHIO, A CORPORATION.

ELECTRIC SAWlNG-MACHINE.

SPECIFICATION forming part of Letters Patent No. 700,980, dated May 27, 1902.

Application filed November 2, 1901. Serial No. 80,852. (No model.)

T all whom, it may concern: Be it known that I, CHARLES PARTINGTON, a citizen of the United States, residing at Newport, in the county of Campbell and State of Kentucky, have invented certain new and useful Improvements in Electric Sawing-Machines, of which the following is a specifica tion.

My invention relates to an electrically-operated cold-saw, particularly adapted for sawing steel rails, girders, I-beams, and the like. The object of my invention is to provide a cold-saw wherein the saw and feeding mechanism are driven by independent electrical motors, enabling the saw to be driven at a very high rate of speed and-quickly controlled.

Another object of my invention is to provide the feeding mechanism with a powerdriven forward feed, which during its forward feed stores up power to automatically retract the feed-carri age when the power-feed is thrown out.

Other features of my invention will be more fully set forth in the description of the 2 5 accompanying drawings, forming a part of this specification, in which Figure 1 is a side elevation of my invention. Fig. 2 is a front elevation of the same. Fig. 3 is a central vertical section of the feed-carriage and its supporting-bed. Fig. t is a section on line a: at, Fig. 3. Fig. 5 is a section on line y y, Fig. 3. Fig. 6 is a section on line to w, Fig. 3. Fig. 7 is a central section of the clutch mechanism for operating the feed-car- 3 5 riage. Fig. 8 is a diagrammatical plan view of my improvement, illustrating the electrical connections.

A represents a frame-standard provided with journal bearings B B, in which the shaft 0 is journaled.

D represents a pulley keyed to the shaft 0 between the bearings B B and provided with a flanged extension D at one end thereof to serve as a fly-wheel, assisting in the velocity. E represents the saw, held secure between I clamping-disks E E, attached to the shaft C. The means for transmitting and controlling the power to the saw will be hereinafter described.

The feeding mechanism is constructed in the following manner:

F represents a motor-casing suitably supported and in proper relation to the saw-supporting standard A. G represents an electric motor set within said casing, having an extended driving shaft G for transmitting power to operate the feed-carriage.

F represents a cap at one end of the easing, the meeting faces of casing and cap being flanged and secured together by bolts f, thus permitting access to the motor and also providing a dust-proof compartment for the motor. It is very essential that all the operating parts be protected from the dust and also from the granular chips and fine metal- 6 5 lie particles which are forcibly ejected from the saw in its operation and which are very destructive to the operating mechanism.

The casing F is provided with an upwardlyprojecting flange F to which the carriagebed H is secured by means of bolts g. The bed H is provided with ways ct, upon which the carriage I slides. H represents a cover for said carriage-bed and serving the further function of holding the carriage upon its ways 7 5 a. The forward feed of the carriage is obtained as followsi J represents a supporting and journaling housing secured to the under side of the carriage-bed H, in which the transmitting Inech- 8c anism is located. The motor-shaft G is extended through the casing F and into the lower portion of the housing J, which is provided with bearings for journaling said shaft G.

K represents a stud-shaft journaled in the housing J above shaft G and at right angle thereto.

1 represents a worm keyed to shaft G within the housing J, transmitting motion to the worm-gear 2, keyed to shaft K, for driving the same.

L represents a shaft journaled within the carriage-bed H and running in parallel horizontal plane with shaft G. 3 represents a worm-sleeve keyed to shaft K, transmitting motion to shaft L through worm-gear 4:. Upon shaft L, loosely journaled, is a rack-gear 5, be

inclosed end. of the carriage.

ing provided with an extended sleeve l), having clutch-teeth Z) at the end thereof.

7r represents a bushing seating in the carriage bed, providing a journal bearing for shaft L.

M represents a rack secured to the lower central portion of the carriage, its teeth meshing with the teeth of rack-gear 5.

N represents a clutch-housin g provided with a flange c, encircling the same, for securing the housing to the carriage-bed H.

0 represents a sleeve extending from the housing N and seating within the carriagebed, fittingthe sleeve 1) of the rack-gear 5 and serving as a journal therefor.

cl represents a clutch-sleeve splined to slide on the end of shaft L and revolve therewith.

6 represents the clutch-operating stem, held in position by knurl-nut e, screw-threaded into the cap N, said cap being provided with a flange coincident with a flange on the clutchhousingforsecuringthesametogether. Theinner end of the stem 6 is provided with a sleeve fitting the outer circumference of the clutch d and having pins 6 projecting into an annular groove d, enabling the clutch (Z to be revolved freely with the shaft L, but permitting the inward and outward manipulation of the clutch for engaging and disengaging the teeth d with the teeth I) of the sleeved rack-gear 5..

h represents a lever loosely fulcrumed to the stem 6 for operating the clutch d, being swiveled on a bracket 7L, secured to the carriage-bed H.

i represents a coil-spring having outward tension to normally hold the clutch in engagement with clutch sleeve-gear 5.

j represents a latch for locking the lever and clutch mechanism from their engaged position.

Thus to impart the forward feed traverse to the carriage motion is imparted from shaft Gr through worm 1 to worm-wheel 2, revolving shaft K, imparting motion to Worm 3, keyed on said shaft K, from thence through worm 3 to worm-wheel & on shaft L. The lever h is released from its locked position, thereby enabling the clutch d through the expansion of spring t' to be automatically thrown into engagement with clutoh sleevegear 5. Clutch d being splined to shaft L revolves therewith and in its clutched position imparts motion to rack-gear 5, the teeth of which being in mesh with the teeth of rack M establishes the forward traverse of the feed-carriage. The carriage is automatically retracted by the following instrumentalities, (see Fig. 3:)

0 represents an adjusting and compression rod having bearing at one end of the carriage and provided with a boss m, contacting the The adjusting portion 0 of the rod 0 is screw-threaded, having its bearing within a corresponding screwthreaded sleeve secured to the carriage-bed H. P represents a hand-wheel for feeding said rod.

Q, represents a compression-spring encircling rod 0 and held in position and given Various tension by the nut n and washer a, while the opposite end of said spring bears against the inner surface of the carriage proper. Thus as the carriage is fed forward the spring Q is compressed against the washer and nut on the end of the red O, the rod 0 remaining in a stationary position. When the desired forward feed is reached, the carriage is retracted by releasing the engagement of clutch d and locked in its disengaged position by means of lever 7L and latch j, as before described, disconnecting the forward powerdrive from clutch rack-gear 5,preventing further carriage-feed. The stored-up energy of the spring will then instantly retract the carriage to its normal position, the clutch rackgear 5 revolving free upon shaft L.

The carriage may be fed forward when desired by hand by turning the hand-wheel P. This forward hand-feed does not cause or effect any compression on spring Q, for the reason that the springis moved a corresponding distance with the carriage, and as the powerfeed is thrown in the compression of the spring will be commenced at] the carriage-adjusted position. By this means the carriage carrying the work can be quickly fed to the proper relation with the saw when the power forward feed, which is operated to a proper running speed for the various grades of metal, is thrown in.

The work is supported upon the carriage, said carriage being inclosed within a housing so constructed as to form a telescopic housing for the hollow bed II, so that when the carriage is extended the gearing is fully protected against the entrance of dust of all kinds. This is a very important feature of my construction. The carriage I is provided with forwardly-prejecting bracket R, upon which the work is carried. 7" represents a slot in the central portion of said bracket, forming a passage-way for the saw. Upon opposite sides of said slot are placed antifriction-rollers S, havinga peripheral configuration corresponding to that of the work, so as to support the same on the feed-carriage and all the material to be sawed to be readily adjusted longitudinally on the carriage. T represents a roller journaled upon a standard T upon the opposite side of said rollers S (see Figs. 2 and S) to assist in supporting the work. To the flange of. the ex tended bracket R are attached telescopic extension-plates U U. These project rearward over the hollow bed or box of the carriagesupport a sufficient distance to keep the same inclosed when the carriage-bed is extended or projected forward, thus effectually preventing the entrance of dust into the gears inclosed in said bed or box.

In the operation of a machine of this class IIO it is very essential in order to successfully saw tenacious metal by what is termed as'the cold-saw method that the saw be run at a very high rate of speed, ranging about two thousand revolutions per minute, while the feed-carriage advances at a very low rate of speed, traveling about four inches per minute, and, further, it is necessary that they may be both controlled independent of each other, yet at the same time may be simultaneously stopped. This result is brought about through electrical appliances in the following manner: I provide apoWer-motor and circuit for driving the saw, the speed of said motor being governed by a controller and the motor-circuit being cut out by a switch located between the controller and the main circuit, the feed-motor circuit being connected to the power-motor between a powermotor controller and a main switch, so that the main switch throws out both circuits and each circuit is independently governed by its own switch and controller. The circuits are arranged as shown on the diagram viewFig. 8.

67 represent main electric current-supply wires connected to a switch 8 for throwing in and out the current. The power-motor circuit is as follows: Wire 9 is connected from the switch 8 to the saw-driving motor 10, transmitting power through belt 11 to pulley D. Wire 12 is connected from the switch 8 to the saw-motor controller 13 and said motor-controller 13 having the usual shunt and field connections 14 15 to the motor. The feed-motor circuit is as follows:

16 17 represent subwires connected to wires 9 and 12 and to an electric switch 18 and thence respectively to fuse-blocks 19, line 17 being connected directly from the fuse-block to the feed-driving motor, while line 16 is connected from the fuse-block to the feed-motor controller 20, said controller 20 having the usual shunt and field connections 21 22 with the feed-drivin g motor G. Thus it will be seen that the saw-motor 10 can be started in ad Vance of the feed-motor G and by the con troller 13 brought up to the desired speed while the motor G remains idle. When the proper speed is imparted to the saw, switch 18 is thrown in and controller 20 set to run motor G at the proper speed. If it is desired to stop both motors simultaneously, switch 8 is thrown out, breaking the current to both motors.

In sawing-machines of the kind before described it is essential to have easy and quick means for increasing and decreasing the feedpower in proportion to the character of the work. In sawing heavy work a very slow feed is required, and the speed of feed increases as the size of the work decreases, because the saw cuts small work much more rapidly than it does large work. I have found by experience that an electrical motor arranged as above described accomplishes this result in an expeditious and satisfactory manner, employing but very little machinery to obtain the desired results.

In a machine of this character it is necessary at times to stop instantaneously and at one and the same time both the saw and the saw-feed. By employing a branch circuit for the feed-motor connecting to the main circuit between the switch and the controller for the power-motor it is obvious that both circuits are thrown out by the switch 8, so that both are instantly stopped. Then as the powermotor has an independent controller and the feed-motor circuit has an independent controller of its own and a switch cutting it out of the main circuit it is independently controlled or cut out at will without affecting the main circuit, which drives the powermotor.

I-Iaving described my invention, I claim- 1. In an electrical sawing-machine, a main motor-circuit, a cut-out switch, a controller in said circuit, a motor connected to a drivingshaft, a saw shaft, in combination with a branch circuit connecting the main circuit between the controller and switch, said branch connection being provided with a switch and controller and in circuit with a feed-motor shaft geared to convey power to the feedingcarriage, substantially as specified.

2. In combination with a sawing-machine, a main power-circuit,a motor adapted to drive the saw-shaft, a controller in said circuit for regulating the power for the motor, a cut-out switch outside of the controller, a branch feedmotor circuit connecting with the main circuit between the switch and the controller, a feed-motor having its shaft connected by a train of back gears to the feed-carriage, an electric controller in said branch circuit, whereby said switch is adapted to simultaneously cut out both motors, substantially as herein described'.

3. In combination with a sawing-machine consisting essentially of a main circuit, amotor-controller, a switch, a branch circuit having connection with the main circuit between said main switch and power-motor controller, a branch switch and feed-motor controller, a motor located in said branch circuit, a feedcarriage connected by a train of back gears to the shaft of said motor in said branch circuit, devices for storing up power with a forward movement of said carriage, means for unshipping the geared connection between said carriage and its motor-shaft, whereby the feed-carriage is automatically retracted independent of all the power driving devices and of the energy transmitted by said circuit, substantially as described.

4:. In metallic-workin g machines employing a cutting-tool, a carriage for supporting and feeding the work to the tool, the combination therewith of a main electric circuit, a motor and controller for driving the cutting-tool, a switch for cutting in said main circuit, a

branch circuit connected with the main cir' main circuit in which said power-motor is located, a controller and a switch in said main circuit, a branch circuit connecting with the main circuit between the switch and controller thereof and in circuit connection with the feed-motor, a switch and controller in said branch circuit, substantially as described.

In testimony whereof I have hereunto set my hand.

CHARLES IARTINGTON. WVitnesses:

OLIVER B. KAISER, WILLY R. INNEs.

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