US900165A - Progressive cut-out mechanism. - Google Patents

Description

J. H. HALL.

PROGRESSIVE GUT-OUT MECHANISM.

APPLICATION rum) MAR. 18, 1908.

Patented Oct. 6, 1908.

3 SHEETS-SHEET 1.

w y g WIT ESSES: |NVENTOR J. H. HALL. PROGRESSIVE GUT-OUT MECHANISM.

APPLIOATION FILED MAR. 18, 1908. Patented Oct 6,

3 SHEETS-SHEET 2.

Ilium II h wfTff'isz fill I Z Z ATTORNEY J. E. HALL.

PROGRESSIVE GUT-OUT MECHANISM.

APPLICATION FILED MAR. 18, 190B.

Patented 061; 6, 1908.

3 SHEETS-SHEET 3.

WITNESSES: mvsu-rofi ATTORN EV UNITED STATES PATENT OFFICE.

JAY H. HALL, OF NEW YORK, N. Y., ASSIGNOR TO THE ELECTRIC CONTROLLER AND SUPPL COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

PROGRESSIVE CU T-OUT MECHANISM.

Specification of Letters Patent.

; Patented Oct. 6, 1908.

i L Applicationflled March 18, 1908. Serial No. 5121,939.

To all whom 'it may coiicern:

Be it known that I, J A H. HALL, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented or discovered new and useful Improvements in Progressive Cut-Out Mechanism, of-which the followingis a specification.

In orderto provide a uniform distribu-' 'tion of the material charged into a blast furnace, the furnace top' is sometimes so made that it can be revolved through a larger or smaller angle after each skip-load has" been deposited upon the usual bell in the top. Such an angle of revolution can be selected that the successive charges may be discharged into the furnace at any desired number of degrees from adjacent char es. If the skip always dumps the material into the top at the zero point, the top may be revolved 85 and the material dropped into the furnace. The next skip-load is, after having been deposited in the bell,.revolved 170 and dropped; the third is revolved 255% be a space of 5 between the adjacent charges. If each angle of movement is 87 instead of 85, the charges will be spaced 3 apart and there will be 120 movements or steps before a cycle is completed. Similarly, if the angle of movement is 89, the charges will be spaced1 apart and there will be, 360

movements or steps before completing a cycle.

My invention is a device which will auto-- matically stop a revolving mechanism so that any desired angle may be included be--,

tween two successive stops.

I shall describe the device as used in connection with-an electric controller operating 21;.ii10t01 which drives the revolving mechan- "-ism of a blast furnace top. Its uses are not *limited to a blast furnace top only but it may be applied to any mechanism movingthrough any given cycle.

Figure 1 is acdiagrammatical representation of one form of my invention for use with a non-reversing motor; Fig. 2, a vertical 4 section through the cut-out mechanism for use with the invention shown in Fig. 1;

Fig. 3, a diagram of a second form of my invention for use with a reversing motor; and Fig. 4, a vertical section of the cut-out mechanism for use with the invention shown in Fi 3. v

Referring first to Figs. 1 and 2, S, S and S represent a set of magnetically operated starting or acceleration switches, having the respective windings 8', s and s for actuating the respective switch arms a, s and 8, arranged to engage with the fixed contacts s s and 8, respectively]. The fixed 'contact 5- is connected by the wire 8 to the movable.

contacts 8'' and s. The movable contact 8* is connected to the positive side of the main switch S by the wire 8,- and the fixed contacts 8 and s are connected by the wires s and s to opposite ends of the starting resistance R, its middlepoint being connected by the wire 8 to the fixed contact 8*.

M is a motor having its armature m in series with the series field winding 1n, connected to the negative side of the main switch S by the wire 8 Iv also provide the shunt winding m bridged across the mains .bei tween the wire 8 and the wire 8 by means of the wire 8 1 The remaining end of the armature winding is connected to the negative end of the resistance R through the winding C of the'magnetic clutch J, the ends of the winding C being joined by the brushes 0 and 0 to the rings 0 and 0 on the hub of the clutch (Fig. 2).

I provide the throttle H, actuated by the winding h, bridged by the wire 8" on the wire .9 and the variable resistance R, which has one end connected to the resistance R by a movable connection, these features. being shown and described in A. C. Eastwoods' patent, N0.8G7,81 0, granted October 8, 1907.

The auxiliary contact h of the throttle H is connected through the resistances r and r to the lower ends of the windings s and is The lower end of and also to the wire .9 the winding 8 is also connected to the auxiliary contact if and the auxiliary con tact 8 while the lower end of the winding s is connected to the auxiliary contact 8 the contacts- 8 and 8 being the'coil C and the rings and c represented by the small letter closed by the auxiliary switch 8 when the switch S closed. The upper ends of the windings s and 8 are connected respectively, to the wires 5 and 8 K and P represent sections of my cut-out mechanism, the parts of the sect n K being 1 with exponents, and the parts of the section P by the small letter 7) with exponents.

70 represents a shaft connected to that portion of the magnetic clutch J which contains The top of the shaft k has pinned thereonthe arm it: which carries the brush 70 arranged to contact with the two concentric contacts 70 and 70 the former being a complete ring and the latter being broken or interrupted at'the point 70.

'p is a shaft parallel to the shaft is, the two said shafts being connected together by the spur-gearsk and p or by any other suitable transmission mechanism. The shaft has loosely mounted thereon the arm latter from left to right.

of the motor L is connected to the gear is by carrying the insulated brush p arranged to connect togetherthe concentric contacts p and p, the former bein broken into six equal sections p to p, t e sections being separated slightly but alternately electrically connected by the wires 7) and 79 so placed as not to be engaged by the brush 7). The contact p is a complete ring. The shaft 19 has the arm 19 secured thereto by a pin, the arm having thereon a pendent portion arranged behind the arm p to drive the The armature Z,

the pinion 12 on the saidshaft." The upper endiof the winding .9 i connected by the wire 4: to the contact 19 aTiid the positive side of the switch S is connected by the wire 5- to the contacts The wire 3 is connected by the wire 6 through the field winding Z of the motor L to the contact 70 and the remainingend of the armature Z, the resistance E being between the armature and the junction of the wires 8 and 6'. The long stationary contact strip n of the master controller N is connected to the wire 3, which is connected to the negative side of the switch S. v The contact at of the master controller N is connected by the wire 1 to the wire. 10, and the contact 12 is connected by the wire 2 to the wire p The arm or handle n of the controller has the brush 12, arranged to-connect the strip n to the strip 11/ or 11 G isa shaft v hi h carries the second member of the magnetic clutch J and is connected at its lower end to any mechanism which angular or other movement it is desired to control according to the principles hereinbefore stated or according to principles derivable tlr refrom. I may for the sake of definiteness assume that the shaft G is cohnected to a furnace top rotatable by the motor M so-as Z to give the shaft and furnace top the same angular movement; that is, the same number oflrevolutions per minute.

The arrangement of the wiring shown on Fig. l is for a non-reversing controller, since each move of the driving motor is always in the same direction. If the arm n be moved {.to bring the brush n on the contact at, the following circuit will exist; from the positive main through the wire .9, the winding 8, the wire 4, the contact 77 the brush p the contact 79, thewires 15 and 1, the contact negative main. The energization of the circuit as follows: from the positive main through the'- wire .9, movable and fixed contacts s and s, the wire 8, all of the resistance R, the clutch winding C, the armature m of the motor M, the series field m, and the wire 8 to the negative main. This circuit causes the rotation of the motor M and consequently of the shaft G. As the circuit of the clutch winding G is also closed the shaft 10 will be caused to rotate with the shaft G.

As soon as the speed of the motor is such as to make it safe to cut-out the first section of the resistance R (which will not be until the current through the winding h permits the contacts h and ll? to be closed), a circuit is set up from the resistance R through the wire sfithe winding 8 the contacts k and h, and the wire 8 to the negative main. This circuit closes the switch S and causes the first sect-ion of the resistance R to be shunted through the wire 8 the contacts 8 and s and the wire 8 to the second section of the said resistance. As the winding 8 is in the circuit of the contact h and k as the throttle H may be lifted as soon as the switch S has been closed, the winding .3 is still kept energized by the small current flowing through the resistance '1', which is so adjusted as not to short-circuit the winding 5 but to permit enough current to flow through it to hold the switch S? closed though never permitting enough current to pass to close the switch when open. The switch S is closed when the motor current is bridge the contacts h and h again, The resistance 7 performs the service for the switch i that the resistance 1" serves for the switch As the shaft it rotates in the direction of the arrow, the brush 70 soon bridges the contacts 70 and [0 thus closing the circuit of the field coil Z and armature Z through the wires 3 and 5. The motor is arranged to tend to rotate the shaft k oppositely to the direction of the arrow, but is over-powered by the motor M. As the arm 70 travels, the arm p drives the arm 29* until the brush 7) is brought over the gap between the sections ,1? and 2 of the contact 77 at which time the win ing 8 becomes dleinergized and the fn'flthe' brush n, and the contact 119 to the.

winding 8 closes the switch S and the motor switch S opens. The switches S and S also open their contact? immediately.

As the clutch winding G has also been deenergized, the shaft p and the gears 73, 19*", and 12 will be no longer driven by the shaft G, but will be driven in the reverse direction vto drive the sections? and K and iotate the motor L againstits torque.

There being six equal gaps inthe contact ring they are apart. If the gears 2 and/ c have 85 and 60 teeth, respectively, it is clear that When the arm p moves 60 or to the gap between the sections 10 and p of the contact pl, the arm will move 85.

The inertia of the moving mechanism causes the arm p to drift 'to the section p of the contact but until the controller arm is brought .to the contact is; thewinding 5- cannot be energized, because the contact 19 is in circuit with the contact a? and not with the contact n. enough to bridge the gap, 8 will be deenergized as soon as 72 leaves 7). No incrt-ia drift is necessary. j

The furnace top, having been revolved 85, is in position to be discharged by the lowering of the usual bell. A fresh charge having been placed inthe furnace top aftert-he bell has been raised, the controller arm n is moved so as to bring the brush 11) on the contact 11*. The-motor M and. the cut-out sections K and P will be rotated before.

The motor M will. operate till the arm p pushes the arm 1) to the. gap between the sections 7) and p, whereupon the winding 3 becomes denergized', the switches S to S open, the motor M stops, the clutch J is decnergized, the arm p drifts 'on to the section 7) and the motor L .returns-the arms is and i to their original positions, leaving the arm behind. The shaft it and therefore the furnace top, has during this second step of revolution turned 17 0. The sec6nd charge is at the end of'this step dropped.

into the furnace and a new chargedeposited m the furnace top. The controller arm 12. is again moved onto the contact '11, causing a rep'etition of the two steps above described except that the furnace top will rot-ate 255 before the arm 79 comes to the gap between the sections 1 and p on the contact-ring p; The operations are repeated hollibz'tum, the furnace top or other rotary mechanism rotating 85 further during each step than it. rotated during the next. preceding step;

If the brush 72 is wide that is, each successive operation automatically stops the furnace top or its equivalent at a point 85 in advance of the previous step. Seventy-two .operations will make a complete cycle and a stop will have been made at each 5 point about the circle. By changing the number of teeth in gear 19 to 87 the successix'e stops will be 87 apart and it will require 120 stops to completeacycle, a. stop being made at each 3 point about the circle. Similarly, if the gear 2) has 89 teeth, it will take 360 stops to complete a cycle, a stop being. made at each degree By properly changing the relative point. number of teeth in the gears 1) and If, any deslred arrangement of stops may be obtamed. The number of gaps in the contact rings 19 and k may be changed to suit various conditions. Gaps in the rings p" and 73" may 'also be made to alter the arrangement of the stops. The motor L is merely a torque device and may be replaced by other means operated by gravity, or a spring, or other force.

Fig. 3 does not differ from Fig. 1 except that the motor Land clutch J have been omitted and the control system has been adapted to a reversing motor. It may be supposed that the motor M drives a revolving ore-bucket'whose cycle of motions is as follows: Starting from the zero position, the

bucket must move forward 85, stop, return to'the zero position, and stop. In the second forward movement, the bucket must move 170, stop, return to the zero position, and stop. Similarly each successive forward movement proceeds 85 in advance of the previous movement, to be followed by av return to the zero position.

In'Figs. 3 and 4, the cut-out mechanism K: and P are thesame as in Figs. 1 and 2. F and F are a, pair of magnetically oper ated switches for giving a forward rotation of the motor M and B and B are similar switches for giving said motor abackward. rotation. S and are magnetically operated switches for accelerating the motor in a well-known manner. The pairs of switches F, B and F B are connected by the wellknown interlocking bars if and f H is the throttle or relay for controlling the switches S and S.

To describe the operation, suppose that the switch S is closed and all other parts of the apparatus are in the position as shown on Fig. '3, and the ore bucket, which lsto be revolved, 1s at the zero pos1t10n.. SIIICG the shaft 7c" makes the same number of revolu-.

-ment of the cut-out arm '70 will {be considered in this description. The zero posi-;

tion is that shown 011* ig. 3. The master switch arm it always moves in a clockwlse direction over the fixed contacts a a, a", and n. The contacts 39, p and p are con nected to the master-controller contact if, and the contacts 10 p and p are connected to the master [controller contact a.

The contact is is connected to the contacts the switch S through the auxiliary contacts of the switches S and S, the windings oi 5 the switches F and F the contact .71 the brush p thecontact p, the wire 1, the contact of, the brush n and the contact ring it to the negative side of the switch. This circuit closes the switches F and F completing the motor circuit as follows: from the positive side of the .switch S through the resistance R, the resistance It, and the winding of the throttle H, the field m of the motor M, the switch F, the armature m, and the switch F to the negative side of the switch S. As the motor speeds up, the switch S will be closed automatically as were the switches S and S shown in Fig. l.

The motor M is started and will stop when the arm p has left the contact p. The movement of the master-handle n to the contact a, causes the controlling circuit to pass through the windings of the switches B and B through the contactlc, the brush 70 the contact 70 and the contact n to the contact ring at. This circuit closes the switches B and B which complete the motor circuit, the current pasing through the armature in the reverse direction, causing the arms 70 and p to return to their original positions, where the arm 7: again causes the motor circuit to be opened. \Vhen the bandle n is moved to the contact a, the windings of the switches F and F 2 are again energized, the current passing from the contact 29*, the wire 2, and the contact n to the brush a and the contact ring of the controller N. This starts the motor,again in a forward direction and it is stopped when the arm p leaves the contact 29 the arm 71: having revolved through 170. hen the arm n is moved to the contact a the switches B and B will be closed and the motor will again be reversed, causing the return of the arms 72 and p to zero.

These operations described are repeated as desired, it requiring 72 forward movements before the cycle begins to repeat. For each;

successive movement, the arm 70 is stopped 85 in advance of the preceding one. By changing the number of teeth in the gears 01' the arrangement of the contacts on the 1 February, 1908.

cut-out sections K and P, any desired cycle may be obtained.

\Vith the construction shown on Figs. 3 and 4: it is not necessary that the arm p be carried across the gaps between consecutive contacts by means of the momentum of the moving mechanism, since the gaps may be small enough to be bridged by the brush p and contact will always be made with either one of the two sets of contacts.

My invention is not limited to the uses described, but is applicable to any apparatus wherein the described movements are required.

The means described may be variously modified while retaining the spirit of my in vention.

I claim- 1. The combination of an electric motor, a

mechanism driven thereby, a starting switch for said motor, a cut-out switch for said motor, means for driving the movable member to successive cut-out positions, and means for rendering the said cut-out driving means inoperative for a predetermined travel of the driven mechanism after each cut-out oper ation. i r 2. The combination of an electric motor, a mechanism driven thereby, a startin switch for said motor, a cutout switch or said motor, means for driving the movable member to successive cut-out. positions, and means for rendering the said cut-out driving means inoperative for a successively different period after each cut-out operation.

3. The combination of an electric motor, a mechanism driven thereby, a starting switch for said motor, a series of spaced contacts, connections including said spaced and mov able contacts for making-said motor operative, and means for driving said movable contact intermittently past the successive spaced contacts, and for rendering said movable contact inactive for variable successive periods prior to its actuation by its said driving means.

' 4. In a rotary a tomatic cut-out, stationary contact membe s spaced with reference to the successive degrees of angular travel required, a movable contact member cooperating with said stationary contact members, means for moving said movable contact forward at a definite angular ratio with respect to the mechanism to be controlled, and automatic means for. returning said moving means to an initial position subsequent to each operation of the cut-out.

Signed at New York city, this 28th day JAY H. HALL.

\Vitnesses MARY F. GATES, KARL FENNING.

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