US1331780A - System of hoist control - Google Patents

Description

R. C. NEWHOUSE. SYSTEM OF HOIST CONTROL. APPLICATION FILED 0on2. 1916.

1,331,780. Patented Feb. 24,1920.

- Hoist Control, .of which specification.

UNITED s tar-Tits PATENT omen. y}

jRA Y C. NEWHOUSE, F WA UWATOSA WISCONSIN, ASSIGNOR TO ALLIS-OI-IALMERS MANUFACTURINGCOMPANY, 0F MILWAUKEE, WISCONSIN, CORPORATION OF DELAWARE.

Original applicatiim flledJ'une -17, 1911,

T Wauwatosa, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Improvement in Systems of the following is a My invention relates to electrically 0p-- eratedskip hoists,

It is the ob'ect of my invention to pro- 'vide askip hoist system, for hoisting stone,

. system" involvin coal, ore, etc., which is normally completely automatic vin its operation but may be manually controlled when desired. r

' In attaining this object I have provided a tunes; The movement of the skips is preferably obtained by an electric motor,- and the motor is controlled by theclosing of the gate of the bin from which the material to be hoisted is supplied to the "at the bottom of the'hoist. ;-The automatic operation of the motor is always in the proper direction to raise the loaded skip and lower the empty skip, the motor being reversible iprthis purposei The closing of the bin gate occurs when the load in the skip at the turn is biased to 'unlatchin bottom of thehoist reaches a predetermined time assume control-and obtain any desired value; Although theiroperation is normally.

entirely automatic,'the' operator may "at any movement of "the skips within their limits of movement. There are also provided a number ofsafety features,

- {Thebr-Oald features of myinvention'are "claimed .in -in copendingf application, Ser.-

Nod-633,798, ed June 17,, 1911", of which,

latter ,bein 3 dlrected more-td-an' ex sltion:

pplication= is a. division, the;

and definition, ofthefeatures' of e ectric hf f prti e rl fr iated drawings,

l at the-bottomef the hoist, occupies;

n nt on-i T e W0 usual:iti'acks 1 ranged so that the skips} pass each other withoutinterference and-yetachskip, when 1110 5113 11 tnie.

svsrnm or HOIS'I common Specification of Letters Patent. I

a number ofnovel fea-' Patented Feast, 1920.

Serial No. 633,798. Divided and this application filed October 2, v 1916. Serial No. 123,288.

tially the samerplace as does the other skip,

under the same circumstances. The operating'cable or cables 13 extend. in the usual ends are fastened to bails 15 pivoted to the skips near their rear ends. This manner of pivoting the bails 15- allows the automatic tipping of the skips as they reach the top.

which engage the auxiliary track 18 *when the skip iS at the top of the hoist; As a, skip manner around the winding drum 14:, and its To obtain this tipping, the rear axle of each skip is provided with additional wh'eels l7, 4

approaches the top, its front axle follows the curved upper end'of the main track, while its rear axle follows the auxiliary track 18,.the

skip being this automatically dumped, the skip ll'is shown dumping.

The hoisting "drlim 1 1 is operated bythe motor 20, preferably" beingdirectly con-' 4 nected thereto. This motor maybe of any desired type, being shown as'an induction motorof the wound rotor type. Its primary circuit supplied from a three-'phase'l 'ne 21," through a circuit-breaker 22. and. a re.-

versing switch 23. The circuit-breaker -22 is biased to open. position, but is held 1n y'closed position by a latch 24. v The latch in position, but is held in latching position y a soleno1d '25.-

located in a circuit which 'under normal Icon ditions -is always closed. The circuit of this "solenoid may be called the emergency con:

trol ciicuit'f all the others are normal -con-' .trol circuits. Upon the 'denergilization of the solenoid 25 for any reason, t e circuit- 'breaker'22 opens The reversing switch 23,- "lslpreferably of the oil-immersed doubleow, mult ple type, and is biased to open position. It s movable to its two-closed. positions by solenoids 26 and '27, respectively. In the' rotorcircuit of the motor 20 Te sections 28, 2'9, 30 and 31,

.32,- 33, 34 and 35,roperated by soenoids 36,

,manually operated master control switch 110,

which may be .sho'rt-circuited -b' switches 1 any electrically. operated; multiple, double throw s'witch'41, alset 1 f'switch'es ;53,-

in lusive, a masterfiirection switch-'54, an

P5 2-, these tracks 12 being. mam eafetyswltch 55.

' ..The master controller 4 0 has" .an oif and I live operative positions, normally stands infthe fifth 'position-.. 1 It is'j not used in the res ' solenoids 26 and 27 of the reversing switch 23. It has one pole for each of the solenoids 36, 37, 38' and 39-andwhen in its two POSI- tions respectively puts such solenoids under the control of the switches 52 and 44 to 47, inclusive, or 43 and 51 to 48, inclusive.

The switches 42 to 53, inclusive, are biased to their lower positions, as by gravity, but may be raised to their upper positions by a taper-ended nut 58 traveling along a threaded rod 59 driven through suitable reducing earing from the shaft of the motor 20. jruides58 prevent the nut 58 from turning. The switches 42 and 53 have upper and lower closed positions, while the switches 43 to 52, inclusive, are closed only when in their lower positions. The switches 42 and 53 in *their lower positions are in the circuits of The switch 54 is normally automatically opthe solenoids 56 and 26, and 57 and 27, respectively. The switches 43 and 52 are in th e'circuits of theswitches 51 to 48, inclusive, and 44 to 47, inclusive, respectively. The switches 51 to .48, inclusive, or the switches 44 to 47 inclusive, according its, the double-throw switch 41 is to the right or to the left, are in the. respective circuits of the solenoids 36 to 39, inclusive. The switches 42 to 53 may be spaced as desired, evenly or unevenly; and the position of the switches 43 and 52 in the series may often be varied. The master directionswitch 54' has on its shaft a ratchet wheel 60, the number of teeth of the ratchet wheel corresponding to the number of positions of the switch 54. This number is an even number, the switch in alternate positions closing the cir cuit to the switches 42 and 43, and '52 and 53, respectively; thus oppositely controlling the direction of operation of the motor 20.

erated, through the ratchet wheel. 60, in a manner hereinafter described. It may also be operated manually by a handle 61. This handle is not used normally.

The main safety switch 55 is biased to .open position, as by gravity, but maybe moved to and held in closed position by a solenoid 62. In order to complete the circuit of this solenoid, either the master controller 40 must .be in position 1, theswitch 42 must be in its upper position, the switch 53 must be in its upper position, or aswitch 63 must be closed; if none of these conditions exist, the switch 55 opens and deenergizes all the normal control circuits. -The switch 63 just referred to is closed whenever a mechanical brake 64, coiiperating with a disk 65 on the shaft of the'motor 20, is released, and the brake 64 released a solenoid 66 whenever current is being supplied-to the motor 20,cthe solenoid 66 being connected to the motor circuit through curdicated in dot and dash lines. During the last part of the closing movement of the bin gate 70, the finger 68 strikes one of the teeth of the ratchet wheel 60 and moves the master direction switch 54 from one position to the next. The bin gate 70 carries a pivoted finger 73, which is in the path of an arm 74 on the top of each skip. The finger 73 is.

biased into the path of the arm 74 by a light spring 7 5 and most of the time is held there by a latch 76, which latter is connected by suitable connecting mechanism to the balance beam 77 of a scale upon which the skip at the bottom of the hoist rests and is released upon a suflicient deflection of said beam. The platform of this scale consists of-two parallel-plates 78 and 7 9, the former being mounted on the other by a nest of springs 80. On the balance heam 77 is an adjustable weight *1 the load taken by a skip.

An indicated, the bin gate is in the form of a shell or shield having side pieces through which it may be rotatably mounted for such I movement from openppsition, indicated in the drawings, as causes swinging ofithe shell or shield upwardly over andaround and in comparatively close contact with the outer Assume that the parts are in the position shown, the arm 74 on the skiplO having engaged the finger 73 and opened the bin gate 70 as suchskip approached the bottom of the hoist. Immediately upon theopening of the r bin gate, the stone, ore, or other material to be,hoisted,-begins to run from the bin 71 into the skip' 10, which may be provided with a lip 82 to prevent any of the material from falling between the gateand the skip. The "circuit-breaker 22 is closed. The switches 23 and 41 are intheir middle or of positions. The brake 64 is applied. The traveling nut 58 is-at the extreme left. hand limit of its movement, holding the switches 42 to 47, in

clusive, in their upperpositions.- The switches 48 to 53, inclusive, arein their lower positions.- The resistance switches 32' to 35, inclusive, are in their lower or open posi' tions. i i

for predetermining To make the system operate autpmatically I skip rises.

rlght, 1t first allows the swltch 42 to drop.

-at full speed the master controller 40 is placed in position 5,- and left there while the automatic operation is to continue. The switch 42 being in its upper position and the master controller 40 being in. an-operative position, the solenoid 62 is energized and the main safety switch is'- held in its-closed position. V

As the skip 1O fills, theplate 78 of the scale platform is depressed, first compressing the springs 80, and then engaging and depressing the plate 79 of the scale platform and raising t the tiltin the latch 6, and the finger 73 momentarily swings past the arm 74 to allow the weight 72 to close the bin. gate 70. This shuts off the supply of material to. the skip .10. As .0

thebin gate'approaches its closed position, the finger 68 strikesone of the teeth of the ratchet wheel and moves the master di-- side of the line 83. The resultant energiza-- tion' of the solenoids 57 and 27 closes the switches 41 and 23 to the left, thus putting the resistance switches 32-. to 35, inclusive, 'underthe'control of the switches 52 and'44 to 47, inclusive, and "completing the primary circuit of the'motor 20 for operation in the one direction. The completion of this primary circuit energizes the solenoid .66 to release the brake 64 and close the switch 63.

The motor 20 now-starts s owly, driving the windingdrum 14 and the rod 59; thus causing thefskip 10 to start upward, the skip 11 to start downward, and the traveling nut '58 to start to the right. The hingedend of the finger 73, which finger has been brought back by the spring 75 into the path of the arm 74 and is reengaged by the latch 76 as soon-as the skip 10 has started upward, al- "lows such arm to pass without effect as the As thenut 58 moves to' the from its upper to.,its lower position, thus ,the solenoids 56 and Y26. The circuit of the solenoid 62, however, remains complete at 60 the switch 63, which isclosed at this tirne;

and the potential circuit for the solenoids 56 and 26 is open at the switch 54; As the nut 58 continues its movementto the right, it next allows the switch 43 to drop'to its lower li orclosed position, thus, completing another I 7 e weight 81. When the load in the skip 10 reaches a predetermined value,

ofthe balance beam 77 releases breaking one maintaining branch for the Q circuit of the operating solenoid 62 ofthe switch 55v and making a potential circuit for j potential circuit, through the switch 43 and the switches 51 to 48, inclusive, for the sole: ,IlOldS 36 to 39, inclusive; this potentiahclrcuit is open both at the switch 54 and the switch 41; The dropping of the switches 42 and 43 does not affectthe speed of the motor 20. I

The continued movement of the nut 58 to the right next causes the switch44 to drop.

This completes a. circuit which branches from the conductor 85 and extends through the switches 52, 44, and 41 to the operating solenoid 36, the circuit continuing through the master a controller 40. The resultant energization of this perating solenoid 3 6 closes the switch32, thus cutting out the first section, 28, of the resistance 1n the rotor circuit ofthe motor 20.- This causes the motor to. increase in speed. As the nut 58 continues its movement to the right, the switches-45, 46, and 47 drop in succession similarly completing the circuits for the solenoids 37, 38, and 39 and causing such solenoids to close their switches 33, 34, and 35 to cut out the resistance sections 29, 30,

and 31 successively. This brings the motor 20 up to full speed.

Such fullspeed continues until the ski-p &

10 approaches its upper limit of movement and the skip 11 its lowerv limit of movement.

At the same time, the traveling nut 58"ap-.

proaches its right hahd limit of movement.

The tapered end of the nut 58 now raises theswitches 48 to 53, inclusive, successively. The raising of the first four of these switches are for use in starting the motor 20 in the opposite direction. Thelifting of the switch 52 breaks the circuits for the solenoids 36 to 39, inclusive, thus deenergizing said solenoids and causing the switches 32 to 35-, inclusive, tojopel'l to cut all the resistance sections 28- to 31, inclusive, into the rotor circuit .of the motor 20 to check the speed thereof. The-lifting of the switch 53 deenergizes solenoids 57 and 27, thus causing the switches 41 and 23, to move to their middle or open positions and interrupting the supplyof current. to the motor. 20. The

interruption of this supply of current causes the denergization of the solenoid 66 and switches produces no effect, as-these four the setting of "the brake 64. The resultant opening of the switch 63 does not deenergizethe solenoid 62 and cause the switch 55 to open,'because the circuit of such solenoid is 'now maintained by the switch 53 in its upper position.

The motor 20 and the two skips now stop,

the skips 10 and 11 having now reached,

their -upper and lower limits, respectively.

The skip 10 in approaching its] upper limit on its front axle having followed the curve at the upper end of the main track 12 and the auxiliary wheels on its rear axle having ,hastipped to dumping position, the wheels 7 followed the auxiliary track 18. The material is thus dumped from the skip into .the receiving bin 89. The arm 74 of the skip 11, as the latter has approached its lower limit of movement, has engaged the finger. 73 and swung the bin gate 70 to open position, whereupon the supply bin 71, unless empty, immediately begins to discharge material into the sk1p 11. r

When the skip 11 is filled with a predetermined'load, the finger 73 is again re-- leased fromthe latch 76 and the bin gate 70 again swings closed. At the end of this 7 closing movement, the finger 68 engages the next tooth of the ratchet wheel 60, and

swings it and the 'master direction switch 54 forward to the next position. This brings the contact 90 of said switch into operation, and completes a circuit which extends from one side of the line 38 through the switch 55,

the contact 90 of the switch 54, the conductor 91, the switch 42 in its lower position the solenoids 56 and 26, the contacts 86 and 87 of the master controller 40 and the switch 88 to the'other side ofthe line 83. The resultant energization of the solenoids 56 and 26-causes the switches 41 and 23 to closeto the right, thus putting the solenoids 36 to 39, inclusive, under the control of the described.

The action of the switches 53 to 48, inclusive, corresponds to-the previous action of the switches .42to 47, inclusive, already described. As the parts reach their other limits of movement, the switches 47 to 42, inclusive, are raised successively, the first.

four of these performing no-function and the last two corresponding in their action to that of the switches 52 and 53 as the nut 58 approaches its right hand limit, as

i already described. The skip 10, which is now approaching the bottom, opens the bin gate in the last art of its downward movement. FI'0'I11 tl11S point the cycle above described is repeated continuously as long as any material is left in the supply hm 71. Then it automatically stops.

During the last part ofthe travel of the I ascending skip, the movement of this skip is not in a direction parallel to the main track 12 but, rather, in such a direction that the skip consumes less ener y of the driving motor. As the most efficient opers ation of the hoisting system. is secured with a fairly constant torque on the driving motor, it is advisable to provide means for absorbing at least some of the energy not needed during the final tripping movement of the ascending skip. Again, considerable energy must be absorbed in order to arrest .the movement of the descending skip. Of

course, the nested springs between the parts 78 and 79 of the platform, are effective to Therefore, to supplement the effect of the sprmgs, in absorbing energy of the descend mg skip and in transmitting energy to the ascending skip in starting, to accelerate the same, a novel scheme is provided which accomplishes the purpose in an economical manner. 1

There is provided between the rails of the track 12, near the bottom thereof, a hook 92, which can slide in suitable guide rails lengthwiseof thetrack 12. i This hook extends upward from the track into the path of some suitable projecting part of the skip, such as one of the axles or a hook 93 firmly fastened to thebody of the skip. The sliding hook 92 is attached by a sturdycable 94 to a circular sheave 95 the cable 94 extending over one or more pulleys 96 to a convenient location for such sheave 95. This circular sheave 95 is mounted onthe same shaft or otherwise firmly connected to a spiral sheave 97, on the periphery of which is a cable 98 attached to a heavy weight 99.

When either skip approaches the end of its downward movement, the hook 93 on such skip engages the sliding book 92, and winds the cable 98 around the spiral sheave 97, thus raising the weight 99 and storing energy in it. The pulley 95 and the sheave] 96 are preferably of such relative size as to afford a speed reduction between the skip and theenergy-absorbing weight 99, such an arrangement causing considerably less shock to the apparatus at the beginnmg of the weight-lifting operation. This eflectis further heightened by the spiral sheave 97 the lever arm through'which the weight I 99 acts being considerably less when the same is at its, lowest point than when atit's highest point, that is, equal increments 'bf angular travel of the' sheavecause unequal increments of travel of the wei ht, the incw ment of travel of the weight ing least at the beginning'of its In other words,

the mechanical advantageof'the skip onthe weight is decreased as the weight moves upward. The weight thusassists in bringing the skip to a standstill, this'action being obtained, because of the spiral sheave 97, without any violent jerks on the mechanism or any undue strains on the cables 94 and. 98. The energy stored in the lifted weight 99 is returned to the skip when the latter starts on its upward movement, thus relieving the motor 20 of someof its starting load. The rate at which this energy is returned to the skip is a gradually decreasing one, thus relieving the starting load on the motor 20 mostly at the beginning of the movement of the latter and gradually decreasing as the motor and skips gain in speed and the extra starting load diminishes. 7 It will be apparent that the spring platform abutment, or the energy absorbing weight may be of such dimensions and so disposed, or both of these elements'may be of 'such relative dimensions and relatively disposed, that the load on the motor, while it is in operation, may be practically con-; stant, that is, of the value required for moving the skips during the intermediate part of their travel, at which art the effort of the driving motor is unah If at any time during the operation of the system, the operator desires to take control, he ma, do so by manipulating the' master 'contro ler 40 and the master direction switch 54. If the skips are at their limits of movement, and the traveling nut 58 is at one of its limits of movement, the motor 20 may be started by moving the master direction switch 5 1 by hand forward to the next positionf This'produces the same efi'ect as the .closing of the :bin gate 70, and theimotor ac-- celerates automatically as the nut 5'8 moves away from its extreme position. If the mo tor is in motion and it is desiredto stop the. skips, the master controller 40 is, moved backward to the off position, thus breaking-- the circuits for the solenoids 36, 37, 38 and 39, the solenoids 26 and 56 or 27 and 57 whichever pair is energized, and the solenoid 62. j This interrupts all the normal control circuits, and the resultant opening of the reversing switch 23 interrupts the primary circuit of the motor and causesthe setting 3 of the brake 64. If a complete stopping of the skips is not desired, the master controller mastercontro11er 40 is moved forward step 40 may be moved lessthan all the Way to the off position, its movement back from pos1'- tions 5, 4, 3, 2 and 1 causing successively the deenergization of the solenoid 39, thesolenoid 38, the solenoid. 37, the solenoid 36, and

opening the switches operating thereby.

' To start the skips againfiin the same""- direc tion in, which they have been; traveling, the

ected by any of the energy absorbing means.

by step to any desired position, the succes-' sive positions causing successively the closing of the primary circuit and the cutting out of the resistance sections 28, 29, 30, and 31. If it is desired to start the motors in the opposite direction, the master direction switch 54 is moved forward to the next position and then the master controller 40 is moved forward from ofi' position, the results --being the same as above described save that the motor revolves in the oppositedirection.

6 When once started, thev system will at once rection switch fromone position to the'next while the parts are in motion, hewill cause the breaking of the primary circuit of the motor 20, the setting of the-brake 64, the opening of the switch 63, and the dropping of the switch 55, thus breaking all the nor.- mal control circuits and stopping the motor and the skips. They cannot be started again I until the master controller 40 is moved to position 1, thus completing the circuit of thesolenoid 62 and causing the recliising of the switches 55 and 63. Then'the'l motor will startand will attain a speed determined by the position to which the master controller 40 isadvanced 1 The switch 8 8-is provided for manually stopping the motor and skips independently of the master controller 4:0.1 By opening the switch 88, the blade leaves the contacts and 101 successively, Onleaving the con:

tact 100 it deenergizes all the resistance controlling solenoids -36 to 39, inclusive. By

leaving the contact l01,' sornewhat later, it 'deenergizes the solenoid of the switch 23,,

thus causing the breaking of the primary circuit of themotor. I which would be given the motor 1f the pri-' mary circuit were broken before the resist- I .ancein the rotor circuit were cut in. -The switch '88 is generallylocated at some con-' This avoids the an venient point-at adistance from the master controller-40; This swi'tch may be omitted if desired, in which case the contact fingers 87 and 102, and their coiiperating contact segments on the master? controller drum, could be combined, the combined finger be-' ingk connected 'direct1y. to one fsideofthef 1 line83..-

Should the pa -alrez 1dy described get out wind'the'. cabld-13 on the drum 14. -.I t.m ight fofor'derf. or fail to work 'for'tany reason, it is possible, that the motor vfr'r'oulldzoven' each 0 A ping of such circuit-breaker and the breaking of the circuit of the motor 20. This stops the motor. In order to prevent the skip at the to of the hoist from falling in case the ca le has been broken by the over-winding, the latch 103 at once automatically swings back beneath the cross-bar of the bail 15. If the skip starts to drop, this latch will therefore catch the bail and prevent such dropping.

If the cable 13 breaks whilethe system is in operation, bothv skips may fall to the bottom of thehoist. The'first skip to reach the ,bottom would open the bin gate 70, and would probably be traveling with so much momentum that it would raise the weight 81 sufiiciently to trip the latch 76 and allow,the bin gate to close and move the switch 54 one step orward. This would usually cause deenergi ation of the solenoid 62 and the opening of the switch 55, thus breaking all the normal control circuits as well as the primary circuitof the, motor.

In order to provide additional rotection, a snap switch 105 is arranged to e tripped by the balance beam 77 of the hoist scale as the latter swung upward from the impact of a f ling skip on the scale platform. This switch 105 is also in the emergency control circuit, or that of the solenoid 25,

"and its opening produces the same results as does the opening of the switch 104. The dis osition of the switch 105 relative to the .welghted beam' 77' such that ordinary operation of the beam, due-to the weight of a loaded skip, is not capable of causing actuation of the switch to openposition. The nest of springs 80 is for the purpose of preventing the lesser impacts, occurring in the ordinary operation of the system, from tripping the latch? 6 and the switch 105, for absorbing the last of the momentum 'of a descending skip, and for giving an ascending skip a kick at starting.

Should the voltage of the main supply circuit 21 fail for any reason while the motor is in operation, the solenoid 66 is immediately denergized. This causes the setting of thebrake 64 and'the opening of .the switch 63. The opening of this switch 63, I

the traveling nut, of course, being somewhere else than in an extreme posltlon I causes the deenergization of the.solenoid"62' and the opening of the switch 55. This breaks all the normal control circuits as well to open, the resistance in the rotor circuit of the motor to be cut in, and the primary circuit of the motor to be broken both at the reversing switch '23 and the circuit breaker 22. In either of these cases, the

system cannot be started in operation again until the switch 55 is closed; and in order to close the switch 55 the master controller must be moved back to its first position.

Any suitable protective means may be provided for protection against overloads. In case of any overload in the arrangement illustrated, a series relay 106 opens the circuit of the solenoid 25 and thus causes the opening of the circuit-breaker 22. In some cases, the circuit-breaker 22 may be dispensed with and the switches 104, 105, and 106 put in some oth'er suitable circuit, as in'the circuit of thesolenoid 62.

I have described my hoisting system in what I now consider to be its. preferred form. Many of the features described can be used, without others, or in specifically difi'erent systems, and many features may readily be modified. I aim to cover all features of my invention, whether separately or in combination, which do not depart from the spirit and scope of my invention as set forth in the appended'claims.

It isclaimed and desired to secure by Letters Patent: i

1. In combination, an electric motor, a reciprocable device operable by said motor, and independently operable switches controlled by said'reclproca-ble device near each limit of its movement, two of said switches at said respective limits of movement controlling the motor circuit to influence the direction of motion, and one-or more others of said switchesat each limit of movement controlling the acceleration of the motor.

2. In combination, an electric motor, a

motor circuit-controlling and acceleration controlling switches shall be effective.

3.. In a hoist, the combination of a car, an electric motor for'operating said car, a cir-' ling said motor,

cuit interrupter for contro and means coacting with said car at one limit of itstrav'el for actuating said circuit interrupter, said means being unresponsive to the dead weight of the car loaded or un-- loaded, but responsive to a predetermined impulse applied by said car.

4. In a skip hoist, the combination of pair of skips, an electric motor for" operat-v ing them, a reversing switch for the motor,

a circuit-breaker in the "motor circuit, and

means for causing the opening of the circuit-breaker in case a'skip falls to the bottom of the hoist, said means being inoperative if the skip travelsto the bottom of the hoist at normal speed.

5. In combination, an electric motor, a

device reciprocable thereby, a switch operated bysaid devirm near each limit, of its movement for controlling the acceleration of the motor, and a separate switch operated by said device near each limit of its movement for controlling the deceleration of the. "motor.

6. In combination, an electric motor, a device reciprocable thereby, and a plurality of switches operated by said device near each limit of its movement, said switches at each crating switch and a motor-decelerating switch and the motor-accelerating switch at each end being in series with the motor-decelerating switch at the other end.

' 7. In combination, an electric motor, a

device reciprocable' thereby, a power-operated' reversingswitch for the motor, one or more power-operated speed-regulating switches for the motor, and a plurality of movement, 'ne of said power-admitting means at each limit of movement controlling the reversingswitch, one or more the speed-' 40 increasing action, and one the speed-decreasing action of said speed-regulating switches,

8. In combination, an electric motor, a

device reciprocable thereby, an. electrically operated reversing switch for the, motor, a

limit of movement including a motor-accel-' regulating resistance for the motor, oneor more electrically operated-switches for con-,-

trolling sa'idlresistance and a plurality of one or morecontrolling the closing, of the resistance switches, anda different one-con- "trolling the opening of said" resistance switches, and means for determining which: ofthe control switches shall control.,

,10. In combination, an electric motor, a; device reciprocable thereby, control means vfor said motor operative to effect continuous reciprocation of said device and comprising 7 Ya plurality of successively operable s eed- 76- controlling devices, said'control means eing operable automatically in response to conditions attending the desired operation of said .normal operating conditions-and said reciprocable device for controlling the operation of said motor, said emergency control means comprisin a switch operable by said brake and etiectlve to render said emergency control ineffective when said brake is in released condition. v

power-admitting means operated by said reciprocable device near each limit of its- '12.' In combination, an electric mo;tor, a

brake operatively associated with said motor an automatically. operative in response to conditions of the motor circuit, a device re- 'ciprocable by said motor,normal control;

means operable by said reciprocable device for efl'e'cting the desired automaticcontrol of said motor, emergency control means opera- ;tive in response to predetermined abnormal 7 control switches operated by said recip'rocable device near each limit of movement, one

50 of said control switches near each-limit of movement controlling said reversing'switch, one or more controlling the closing'of'the resistanceswitches, and a different one controlling the opening of said resistance switches. s 9. In combination, an electric motor, adevicereciprocable thereby, an electrically Operated' reversing switch for. the motor, a regulating, resistance fornthe motor, one or more electrically operated 'switches for con trolling said resistance a pluralityvof. control switchesgop'e'rated by; said reciprocable devicen'ear each limit of movement, one of said control switches near eaohllmitfof o5 movement controlling said reversing sw tch,

operating conditions ,for controlling theopera-tion of said motor,-and means for rendering said emergency control ineifective during normal operation of said motor, saidmeans comprising'a switch operatively asso ciated with said brake and operative to ren-' d'er said emergency control inefi'ective when the motor is running, and an auxiliary switch automatically operative in response tothe movement and position of said reciproe'able device for. rendering the emergency control ineffective-when the motor is inoperative and thebra'ke is in set position.

13. In combination, an electric motor, a device reciprocable thereby control means for said 'motor operative to cause the controlled operation of said motor in either direction and comprising a circuit-opening switch and a pluralityof successively operable speed-controlling devices, vsaid rec1pro--- cable device-F beingautomaitically operative to cause the desiredsuccessive operation of said speed-controlling devices, a manually operable device operative to efi'ect the desired successive operation of said speed-controlling devices, and auxiliary means opera-- tive at thewill of an operator for causing the successive operation of said speed-controllingvdevices and-the operation of said circuit-opening switch.

14. In combination, a motor having a rotor, a reversing switch therefor, primary a,

speed controlling means, means for controllingsaid speed controlling means including devices responsive to the travel of the rotor of said motor in either direction, and means dependent upon thetravel of said rotor for controlling both said reversin switch and said means for controlling said" speed con trolling means. I

15. In combination, a motor, a device reciprocable thereby, means for controlling the speed of said motor comprising a pluralit of sets of switches associated-respectively w1th. the limiting positions of said device, means responsive to the position of said reciprocable device for transferring control from one set of said switches to the other and reversing the direction of operation of said motor.

16. In combinatiom'a motor,'a device reciprocable thereby, means for causing said motor to automatically reciprocate said device at desired intervals, and means dependent upon the position of said device for in-;

creasing the speed of said motor as said device moves away from a limit of its reciprocation. v

17. In combinatiom-a motor, a device re.- ciprocable thereby, means for causing said motor-to automatically reciprocate said device at desired intervals, means dependent upon the position of saiddevice for increasing the speed of said motor as said device moves away from a limit of its reciprocation,

and for decreasing the speed of said motor as said device moves toward a limit of reciprocation).

. 18. Incombination, a motor, a device reciprooable thereby, reversing switch-means forcontrolling said. motor, means responsive to the reciprocation of said device, a pluralityof-sets of switches associatedrespectively withthe limiting positions ofthrecipro- I cable device, one switch at least ofeach set of said switches exercising control over said reversing? switch jointly with said reciprocation-responsive means, and means responsive to the reciprocation of said device for transferring control from one set of said switches to the other.

19. In combination, a motor, a device reciprocable thereby, a reversing switch for conling means for said motor, a plurality of sets of switches dependent uponthe position of saiddevice for controlling said primary speed controlling means, means for trans ferring control from one of said sets to the other, a portion of. each of said sets of switches being operable to cause an increase of speed of said motor as said device moves away from a limit of reciprocation'and one switch at least of each of said sets being operable to cause a portion of the other set to become inactive. I

21 In combination, a motor, a device ,reciprocable thereby, means for controlling the speed of said motor, a plurality of sets ofv switches associated respectively with the limitingJpositions of said device, means responsive to the position of said device for controlling said sets of switches so that as said device moves away from a limit of reciprocation the speed of said motor will be increased and as said device approaches the opposite limit of reciprocation control Wlll be taken away from said first mentioned set and transferred to another set.

22. In combination, amotor, a devlcere- .ciprocable thereby, means for causin said motor'to automatically reciprocate sald de-.

"vice at desired intervals including means for automatically controlling the speed of said motor, and means whereby said speed controlling means may be controlled m-an ually wliile automatic reciprocation continues.

In testimon whereof the signature of the inventor is a xed hereto.

RAY O. NEWHOUSE.

Images