US1374124A - System for the control of dirigible devices from a distance - Google Patents

Description

A. D. TRENOR. SYSTEM FOR THE CONTROL 0F DIRIGIBLE DEVICES FROM A DISTANCE.

APPLICATION FILED .IUNE 3, 1918. RENEWED JUNE 24,1920.

Patented Apr. 5, 1921.

2 SHEETS-SHEET I.

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Lamm@ WIT/V588:

' his 770mm A. D. THENOR. SYSTEM FOR THE CONTROL OF DTRIGTBLE DEVICES FROM A DISTANCE.

APPLICATION FILED JUNI-2,3, 1918. BENI-:WED JUNE 24,1920.

/W H55 77031415 Y Patented Apr. 5, 19

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man STATES PATENT OFFICE.

ALBERT D. TRENOR, OF NEW YORK, N. Y., ASSIGNOR TO JOHN IEIYS HAMMOND, JR.,

' OF GLOUCESTER, MASSACHU'SETTS.Y

SYSTEM FOR THE CONTROL OF DIRIGIBLE DEVICES FROM A DISTANCE.

Patented Apr. 5, 1921.

Application led June 3, 1918, Serial N0. 237,921. Renewed June 24, 1920. Serial No. 391,552.

To all whom t may concern.'

Be it known that I, ALBEN;` D. TRENOR, a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented cer.

tain new and useful Improvements in Systems 4for the Control of Dirigible Devices From a Distance, of which the following is a specification.

Some of the objects of this invention are to providean improved system for the control of dirigible bodies from a distance whereby a plurality of different mechanisms may be selectively controlled by a minimum number of impulses or signals received from a distance; to provide a common control for distributing motive fluid to a plurality of different actuating devices and providing selective means operated froma distance to position said common control 1n a predetermined manner to cause the' operation ofany one of said actuating devlces; to provide other improvements as w1l`ln appear ,heremafter.

In the accompanying drawings, Figure 1 is a diagrammatic plan partly in section of a system embodying one form of this invention; Fig. 2 is a detail in elevation o f one part of the control mechanism; Figs. 3 to 10 inclusive represent longitudinal sections of a control part of the system showing the same in various positions; Fig. 11 is an enlarged longitudinal section of a detail forming a part of this invention; Fig.l12 is a detail in plan of the centering device controlled by the gyroscope; and Fig. 13 is a detail in bottom plan of the commutator construction. A f

Referring to the drawings, one embodiment of this invention comprises any suitable dirigible device, for example a marine vessel (not'shown), which is provided with a rudder 10 pivotally connected thereto to swing with respect thereto about a fixed axis 11. To oscillate the rudder 10 about its axis 11 under pneumatic pressure, a cylinder 12 is rigidly secured to the vessel and i. is provided with a piston A413 arranged to reciprocate` therein and which is rigidly secured to one en-d of a piston rod 14, the other end of which has a pivoted connection l5 'with a link 16 which in turn is pivoted at 17 to the arm 20 which is rigid with the mounted upon the vessel to perform various functions, as will appear hereinafter, a tank 23 or other suitable'source of air or other fluid under pressure is mounted upon the vessel and is connected to the various devices'as will bey described hereinafter.

Forvcontrolling the distribution of fluid under pressure from the source 23 to various Huid actuated devices on the vessel, a main distributing valve is provided comprising a tubular casing 24 having a cylindrical bore in which a cylindrical plug 25 is snugly but Vrotatably fitted. `The valve casing 24 is provided on one side with two fluid inlet ports 26 and 27, an exhaust port 28, and three additional ports 30, 31 and 32, and upon its opposite side with two exhaust ports 33 and 34 and four other ports 35, 36,

37 and 38. The valve casing 24 is also pro-- vided with two olppositel arranged ports 40 and 41 preferab y exten ing in a direction substantially perpendicular to the ports 30, 35 of theV casing and openingl lnwardly against the periphery of the plug 25. The valve plug 25 is provided with four annular recesses 42, 43, 44 and 45, the first 42 communicating with the exhaust port l33; thel second 43 with the inlet port 26; the third 44 with the inlet port 27 ;and the fourth 45 with the exhaust port28. One end of thevalve plug'25 is -provided with a circumferential series of eight longitudinally arranged passages 50 51, 52, 53, 54, 55, 56, 57, one

of which as 57 is normallyin communication with the annular recess 43 and the remain- .ing passages 50 to 56 inclusive being `normally in communication with the' annular recess 42 while all of said ports are adapted to registerl respectively with the ports 30, 35, 40 and 41, and with respect to each other are spaced circumferentially forty-five degrees apart.l The opposite endk of the valve plug'25 is provided with a group of eightw circumferentially arranged longitudinally disposed passages 60, 61, 62, 63, 64, 65, 66

and 67, two of which, as 66 and 67, are normally in communication with the annular recess 44 and the remaining passages 60 to 65 normally in communication with the anvnular recess 45, all of said passages being adapted. to register respectively with the and 76'and one passage 77 bored into the' plug 25 and having two openings 78 and 79 on the surface of the plug, the latter being in communication with a passage 79 extending diametrica-lly through the plug 25. The opening 78 is adapted to register successively with the ports 32 and 37 and the opening 79 is adapted in one position 'to vregister directly .with the exhaust port 34 and" in a second position to register indirectly with the exhaust port 34 by way of the passage 79. The passage 76 is normally lin communication with the annular recess 44 and is arranged to register with either the port 32 or theport 37 according to the position of the valve plug 25, while the passages 70`to 75 incluslve are respec-,

tively adapted toregister with either the pair of ports 31 and 32 or the pair of ports 36`and 37 according to the position of the valve plug25. The passages 70 to 77 inclusive are angularly spaced one with respect to another at a forty-five degree angle and consequently each eighth of a revolution of the valve plug 25 brings a different passage into operation.

From the foregoing it will be evident that .the plug- 25 is provided -with three setsvof control passages, and in this connection it should be noted that the respective passages of each set are in longitudinal alinement with the respective passages of the two other sets so that any movement of the plug through one eighth of a revolutionjwill bring three dilerent passages into a position for control purposes.

For automatically controlling the flow of pressure fluid from the tank or source 23 through the valve casing.24 to maintain the vessel automatically upon a predetermined course, as will appear hereinafter, an auxiliary valve 80 is arranged to reciprocate in a' fixed auxiliary casing 81 and the opposite ends of the valve 80 are extended to l form cores 82 and 83 which reciprocate in xed solenoids`84 and 85 respectively. The

valve 80 is Anormally held central by the` springs 86 and 87. The valve casing 81 is provided with an inlet pipe 90 which con- 91 and 92 with the oppositely disposed ports 31 and 36 of the mam valve casing 24. The valve 8()v is formed with an annular recess 93 with which the supply pipe90 normally communicates and the parts are so arranged that when the valve is in a central position, as shown in Fig. 1, no air will be allowed to fiow from the inlet pipe 90, through the valve casing 81 to either of the pipes 91 or 92, and these latter will be permitted to exhaust through the open ends of the valve casing 81. When, for example, the left hand solenoid 84 is energized the auxiliary valve 80 will be drawn to the left a'sufiicient distance to establish communication between the inlet pipe 90 and the pipe 91 while leaving the pipe 92 open to the exhaust, but when the current is broken through the solenoid 84 and the right hand solenoid 85 is energized, the auxiliary valve 8() will be drawn to the right to establish communication between the inlet pipe 90 and the pipe 92 and to leave the pipe 91 open to the exhaust. l

When the steering of the vessel is under the automatic control of valve 80 the main valve plug 25 is in such a position as to establish communication between the pipe 91 and a pipe 94 by way of one of the passages, as 70, and to also establish communication between the pipe 92 and a pipe 95 by way of another of the passages, as 73, see Fig. 3.

f The pipe 94 is connected to the steering control cylinder 12 to communicate with one end thereof and the; pipe 95 is connected to the cylinder 12 to communicate with the opposite end, the arrangement being suchn that the piston 13 is intermediate the inlets of the two pipes and is accordingly Iioyied as one or the other supplies pressure For automatically energizing the solenoids 84 and 85 to maintain the vessel upon a predetermined course, any suitable dire"- tion maintaining means may beprovidedY but in the form ofv the invention shown there is provid'ed for this purpose in a suitrotation in space with respect to its longitudinal axis. In llongitudinal alinement with the stem 97 isa spindle 99 which is arranged to rotate in a fixed bearing 100 and has its lower portion in the form of a hollow cylinder 101 having a cap 102 xed over its lower end, and within this cylinder 101 is arranged tov reciprocate a piston 103 which is fixed upon the end of a piston rod 104, the lower portion of which projects slidably through the cap 102 and through a yoke 105 lixedupon theupper end of the stem 97. The lower end of the piston rod 104 has 'fixed thereon a clamping disk 106 arranged to coperate with the yoke 105 to clamp the yoke against the cap 102 to hold the spindle 99 fixed with respect to the gyroscope stem 97. A compressed spiral spring 107 normally presses thepiston 103 upwardly to clamp the yoke 105 to the cap 102. For forcing the piston 103 downwardly to disconnect the spindle 99 from the stem 97 the upper portion of the cylinder 101 communicates through a longitudinal passage 108 with an annular recess 109 in the spindle 99 and from the recess 109 by way of a pipe 110 to the port 38 of the main valve casing 24. The spindle 99 has fixed thereto to move therewith -`a segmental contact disk 111 having two points of insulation 112 to form two contact lsegments 113' and 114, the first 113 being connected by a ,conductor 115 through a slip ring 113 with the windin of the solenoid 84, and the second 114 being connected by a conductor 116 through a sl1p ring 114 with the winding of the solenoid 85. A contact arm 117 is secured toa fixed partsuch as a bracket 118 and normally rests upon one point of insulation 112 between the segments 113 and 114, but is adapted to engage one or the other of vsaid segments 113 and 114 u on movement of the disk about its axis. il'he arm 117 forms the common return of the pins 126 upon the disk 111.

For pneumatically controlling a plurality of operative devices controlled by suitable pressure fluid motors, -not shown, the port 30 of the main valve casing 24 is provided with a pipe 130 leading to one device, such for example 'as an engine control; the port 35 is provided with a pipe 131 leading to another device such for l, example as a searchlight shutter; and the ports 40 and 41 provided respectively with pipes 132 and 133 connecting respectively to other pressure fluid controlled devices. Pressure fluid is admitted to the valve casing 24 by the , pipes 127 and 128 communicating respectively with the ports 26 and 27 and with compressed air tank 23 or like source.

For-rotating the valve plug 25 to control the distribution of fluid tothe various de-` vices 'on the' vessel, one end of the plug 25 is provided with a projecting shaft 134 coaxial therewith and rigidly secured thereto and upon this shaft 134 is xedly secured a sleeve 135 havingas a-iixed part thereof a ratchet wheel 136. At one side of the ratchet wheel 136 there is a pinion 137 loosely mounted on the sleeve 135 and adapted to turn with respect thereto, this pinion 137 having a spring pressed pawl 138 arranged to coperate with the ratchet wheel 136 so as to'turn the same in a clockwise direction when viewed as in Fig. 2. At the opposite side of the ratchet wheel 136 there is another pinion 140 also loosely mounted on the sleeve 135 and adapted to turn with respect thereto and having a spring pressed pawl 141 arranged to'copcrate with the ratchet wheel 136 so as to turn the same also in a clockwise direction when viewed as in Fig. 2.

For rotating the two pinions 137 and 140, two substantially parallel racks 142 and 143 are arranged to engage the opposite sides of determined position (as shown in Fig. 1)

by a spiral spring,147 operatively located in the cylinder 145. yThe end of the cylinder 145 opposite to the spring end is provided with a'port 148 controlled by a slide valve'150 arranged to reciprocate 1n a casing 151 and alternately places the port 148 in communication with the supply pipe 152 and the exhaust pipe 153. The pipe 152 is connectedto the air supply tank 23'and receives pressure iluidtherefrom as required.

Any suitable means may be provided to reciprocate the slide' valve 150 but in the form ofthis invention shown the movable valve 150 is rigid with a core 154 which is drawn in one direction by the energizing of a solenoid 155 'and in the other direction by a spring 156, which latter also-maintains the valve in normal osition to cut oi the supply of. pressure uid. The solenoid 155 is 1n a normally open circuit including the battery 157 and detector 158 which is in the form of an evacuated glass bulb having a terminal 160, grid 161 and filament 162- heatedby the local circuit of. battery 163.

f The grid 161 is connected as usual with the primary closed oscillatory circuit 164 having the variable condenser 165 and secondary transformer coil 166. kThe primary oscillatory circuit is :tuned-to the natural frequency of oscillation of an open aerial r circuit comprisin an antenna 170 in series with a primary co1l171 and grounded at 172.'

The construction and arrangement are such that when an impulse is received the solenoid v155 will be energized and thus pull the slide va1ve`150 to a position to close the exhaust pipe 153 and admit pressure fluid to the cylinder 145 back of the piston 146 thereby overcoming the pressure of the spring 147 and forcing the piston 146 and the racks 142 and 143 to the right a suiiicient distance to rotate the pinion 137 in aclockwise direction throu h 45 degrees, while the pinion 140 is rotate in a counter-clockwise direction through 45.

This action results in the pawl 138 engaging the ratchet wheel 136 and turning the shaft 1,34 through 45 degrees while the pawl 141 of the pinion 140 rides freely over the ratchet 136 without doing any work. At the end of the impulse the solenoid 155 is deenergized and the spring 156 returns slide valve 150 to a position to cut ofi' the pressure Huid to cylinder 145 and open the port 148 to the exhaust, whereupon the spring 147 causes the piston 146 to move to the left. The result of this is a reverse movement of the racks 142 and 143 whereupon the pinion 140 through its pawlv operatively engages the ratchet wheel 136 and moves the shaft 134 in a clockwise direction through another 45 degrees. The return movement of the rack-142 rotates the pinion 137 in ay counterclockwise direction without aliecting the ratchet wheel 136 since the pawl 138, in this direction of movement, merely rides over the ratchet wheel 136.

In the operation of the form ofthe invention hereinbefore described, and shown in the several figures of the drawings, the movable body is normally steered automatically upon a predetermined course through the action of the gyroscope 96 and the coperatin mechanisms and for this purpose movab e .valve plug 25 is normally positioned as shown in Fig. 3, though the same result may be obtained with this part in other positions as will later appear.

Assuming that the valve parts 24and 25 are in the position shown in Fig. 3 for automatically controlling the course of the vessel, then the pipe 110 leading from the gyroscope clutch is open to exhaust through the port 38, passage 61, recess 45 and exhaust port 28, thus permitting the air to flow out of the upper part of the cylinder 101 to allow the spring 107 to press the piston -103 upwardly and to clamp the yoke- 105 against the cap 102, thus holdin the spindle 99 and its disk 111 rigidly in xed relation to the gyroscope stem 97, and when the armis thus held, if the vessel should deviate either to the right or to the left from its predetermined Ycourse, the arm 117would make contact with one or the other of the contact segments 113 and 114 according to the direction of movement. Assuming the deviation of the vessel to be to the right, then the contact arm117 will swing with the vessel and contact with segment 114 whereupon the circuit will be closed through conductor 116, right hand solenoid 85, conductor 120, battery 121 and arm 117, and the solenoid 85 energized to draw the valve 80 toward the right and permit compressed air to fiow from tank 23, pipe 90, annular passage 93,

Lamme pipe 92 passage 73 in pl' 25 pipe 95 into the right hand end of cyilinder 12 vto move the plston 13 toward the left, thus swinging ythe rudder 10 clockwise to restore the vessel to its predetermined course. In this movement of the piston 13 toward the left, the left hand end of the cylinder 12 will be free to exhaust through the pipe 9.4, passage in plug 25, pipe 91, to the valve casing 81 at the left hand end. Whenthe piston 13 is moved a suiicient distance Atoward the left to cause the boat to turn to the left a suiicient amount to bring the arm 117 to rest again upon the insulation, the circuit through the right hand solenoid 85 will be broken and the valve 80will be restored to normal position bythe springs 86 and 87, thus cutting oil' communication between the air supply pipe 90 and the pipe 92 and permitting this pipe 92 to' exhaust through the right hand end of the valve casing 81, thus relieving the right hand end of cylinder 12 and allowing the piston 13 to be returned to a' central position by the springs 21 and 22. If the vessel should deviate toward the left,

-the same automatic action takes place but bringing the solenoid 84 into operation and the set of pipes and ports necessary to admit air to the left hand end of cylinder 12 to shift the rudder to return the vessel to its predetermined cours'e.

When it is desired to take over the control of the vessel from the gyroscope and steer the vessel at will from a distance in response to impulses of radiant energy, the required number of impulses are sent to turn thevalve plug 25 to release the gyroscope control and position the plug passages to properly give the desired shifting of the steerlng piston 13.l

Assuming that it is desired to steer the vessel to the right by distant control and assuming that the valve parts 24 and 25 are in the normal position, as shown in Fig. 3,' a relatively short impulse is sent and received by the antenna 1-70 whereby the solenoid 155 is energized to cause the valve 150 to admit pressure Huid to the cylinder 145 4and the piston 146 reciprocated one stroke. The or-.` i

ward half of this piston stroke, by means of the rack 142, pinion 137, pawl 138 and ratchet wheel 136, turns the valve plug 25 clockwise an eighth of a 'revolution to the position of] Fig. 4, and upon the return stroke 'of the piston, which takes place in this instance immediately, the valve plug 25 is continued in its clockwise movement another eighth of a revolution by the action of the rack 143 and the associated parts. AThe transmitted impulse has thus brought the valve parts to the position shown in Fig. 5, wherein the gyroscope control is released because the pipe 110. is now in communication `by way of port 67 and recess 44 with the pressure fluid supply pipe 128 and consef quently the piston 103 is moved against the whereupon the parts will bein the position pressure of the spring 107 to release the clutch heretofore connecting the parts together. Also. the valve plug 25 is in position to connect the pipe 95 by passage 77 with the exhaust port 34 and to simultaneously' connect pipe 94 by passage 76 and recess 44 with the pressure fluid supply pipe 128. The pipes 91 and 92 from the electro-magnetic control valve are cut oli and the steering accomplished independently of the automatic control. Pressure iuid is therefore admitted through pipe 94 to the left end of cylinder 12, thus forcing the piston 13 toward the right to swing the rudder 10 counter-clockwise to turn thevessel toward the right. During this movement of the rudder the right hand end of cylinder 12 is free to exhaust through pipe 95, passage 77 and exhaust port 34.

When it is desired to steer the vessel toward the left the valve plug 25 is rotated through one half a revolution from the position shown in Fig. 5, by sending the re quired number of im ulses to energize the solenoid 155 the required number of times,

indicated in Fig. 9 and the automatic con- ,trol cut out as heretofore explained, and the right end of the cylinder 12 will be in communication with the pressure fluid supply ipe 128 and the left hand end of the cylinder 12 will be open to the exhaust through the pipe 94, passage 77, passage 79' and exhaust port 34, and the rudder 10 will be -rotated clockwise to steer the vessel toward the left. When it is desired to operate any of the auxiliary devices under the control of the pipes 130, 131, 132 and 133 without disturbing the automatic steering control the following o peration takes place, it being assumed, by way of example, that vthe device controlled by pressure fluid through pipe 132 is the one to be actuated. With the valve 25 in the neutral position of Fig. 3, a long impulse is transmitted to'energize the solenoid 155 and cause pressure fluid to be admitted to the cylinder 145 to move the racks 142 and 143 to the right, as viewed in Fig. 1, and hold them in such position for the length of the impulse. This rack movement turns the valve plug 25 through 45 into the position shown in Fig. 4 wherein air enters the pipe 127 and passes by wayof groove 43 and passage 57 to pipe 132 by which it is delivered to a suitable fluid operated means for operating the desired auxiliary device. The automatic steering control is not interfered with and remains operative because the passages 72 and 75 have respectively move into the position of the passages 73 and 70 so that the pipes 91 and 94, and 92 and 95 are still in communication. Also the pie 110 is still in communication with the e aust port 28 so that `the gyroscope is effective. The impulse is of suflicient length to allow the pressure iiuid to operate the selected device and when the impulse is stopped the return movement of the racks 142 and 143 ,turns the valve plug 25 through another 45 into the position shown in Fig. 5, which is a Vposition to cut out the automatic steering control and to cause the boat to be steered to the right. Unless this is the action desireda short impulse is immediately sent to again reciprocate the racks 142 and 143 and cause the valve plug 25 to turn through 90, namely from the position of Fig. 5 to the position of Fig. 7, which latter 1s a neutral position as far as the auxiliary devices are concerned but allows the boat to remain under automatic control. In this manner the valve plug 25 may be rotated to any selected position by varying the lengthV of the impulse, the long impulse being effective to connect a desired auxiliary device with a source of pressure iuid for a suffi cient time to operate that device and yet without disturbing conditions of automatic steering control. It should be noted that in the present form it is perferable to have but one auxiliary device operable at a time, and consequently when the valve lug 25 is in a position to control one suc device the pipes for the remaining auxiliary devices are connected with the exhaust 33.

In each of the positions indicated in Figs.

4, 6, and 8 and 10 the valve parts 24 and 25 are located to maintain the automatic steering control in operation while permit-` vices, of a source of pressure fluid, and

means including a single rotatable valve member operative in response to an impulse of energy to cause the distribution of pressure fluid'l from said source to one of said devices to actuate the same and operative upon the cessation of said impulse to cause the distribution of pressure fluid from said source to another of said devices to operate the same.

2. The combination with a dirigible body, of steering means therefor, direction maintaining means carried by said body and automatically operative to control said steering means to direct said body upon a predetermined course,v and means including a single rotatable valve member operative in response to an impulse of energy to move said valve to one position and operative as a result of the cessation of said impulse to render said direction maintaining means inoperative and yto changeA the direction of ymovement of said body through said steerand to admit pressure Huid to said steering means to ldirect said body in' a 'predetermined manner, said responsivevmeans being operative upon the cessation o f'another impulse to vrotate said rotatable member in the same direction to another position to restore said direction maintaining means as an automatic control of said steering means.

4. In acontrol system for dirigible bodies, a multiple portvalve including a rotatable control element, a source of pressure fluid controlled by said valve, means for rotating said control element in one direction, means responsive to impulses of radiant energy for operating said rotating means to move said control element to a' predetermined position, means rendered operative upon the cessation of an impulse to continue the rotation of said control element in the same direction to another position, a steering device, means controlled by said valve for causing said steering device to be automatically.; :operated, and independent meansgcintrolled by said valve for causingsai'd steering device to be operated at will from a'iistance.

5. In a control system for 'dirigible bodies, a multiple port valve including a rotatable control element, a source of pressure fluid controlled by said valve, means for rotating said control element in one direction, means responsive to impulses of radiant energy for operatin said rotating means to move said control e ement to a predetermined posltion, means rendered operative upon the cessation of an impulse to continue the rotation of said control element in the same direction to another position, a steering device, means controlled by said valve for causing said steering device to be automatically operated, independent means controlled by said valve for causing said steerin device to be operated at will from a dlstance, and means for rendering said automatic means inoperative when said steering device is controlled at will.i

6. In a control system for dirigible bodies, a steering means, a multiple port valve including a rotatable control element, a source of pressure fluid controlled by said valve, a plurality of distributing pipes connected respectively to auxiliary control devices, and meansresponsive to impulses of radiant energy to rotate said valve to selectivel Icontrol said distributing pipes and to simu taneously maintain automatic control of said source o pressure fluid controlled by said valve, a plurality of distributing pipes con nected respectively to auxiliary control devices, and means responsivev to a relatively long impulse of radiant ener to shift said valve to admit pressure fluid to one distributing pipe and to simultaneously maintain automatic control of v said steering means and responsive to asucceeding short impulse to restore said valve to a neutral position with said' steering means under said automatic control. v

9. In a control system for dirigible bodies, a steering means, a multiple port valve including a single rotatable valve member, a source of pressure Huid controlled by said valve, a plurality of distributing pipes connected respectively to auxiliary control devices, and means responsive to a relatively.

long impulse of radiant energy to rotate -said valve member to admit pressure Huid to one distributing pipe and to simultaneously maintain automatic control of said steering means and responsive to a succeeding short impulse to restore said valve to a neutral position with saidsteering means under said automatic control.

10. The combination with a dirigible body, of steering means therefor, direction maintaining means carried by said body and automatically operative to control said steering means to direct said body upon a predetermined course, a source of pressure fluid, a single rotatable valve member operative to control the admission of said pressure fluid to said steering means, a plurality of distributing pipes connected repectively to auxiliary divices and controlle by said valve, and means responsive to impulses of radiant energy to position said valve to select a predetermined distributing 'pipe for pressure fluid and to simultaneously maintain said automatic direction maintaining means operative to steer said body.

11. The combination with a plurality of vices, of a source of pressure fluid, and

`means including Ia valve member operative in response tov an impulse of energy to cause the distribution of pressure `Huid from said sourceto one of said devices to actuate 'the same, and operative upon the cessation of Ysai 1f-imp111`se to cause the distributies of pressure fluid from said source to another of said devices to o erate the same.

Signed at New ork, in the county of 27th day of May, A. D. 1918. Y

'- ALBERT D. TRENOR,

'New York and kState of New York, this

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