US 1989357 A
Description (OCR text may contain errors)
Jan. 29, 1935. F. w. GRISWOLD SIGNAL FOR RAILWAY CROSSINGS Filed Feb. 4, 1928 4 Sheets-Sheet 2 IN vnvrom F/ffiN/f W. 6/715 WOLD. arms flTTfl N575.
Jan. 29, 1935.
F. w. GRISWOLD SIGNAL FOR RAILWAY CROSSINGS Filed Feb. 4, 1928 4 Sheets-Sheet 3 6) HWIWKEYEZ,
Jan. 29, 1935. F. w. GRISWOLD 1,989,357
SIGNAL FOR RAILWAY CROSSINGS Filed Feb. 4, 1928 4 Sheets-Sheet 4 A 2% W W 1,, I" fll l l m M I 5 Patented Jan. 29, 1935 UNITED STATES PATENT oer-"ICE SIGNAL FOR RAILWAY CROSSINGS Frank W. Griswold, Minneapolis, Minn., assignor,
by mesne assignments, to Griswold Signal Conipany, a corporation Application February 4, 1928, SerialNo. 251,858 13 Claims." (01. 171-329) when a train is approaching. It is also desirable to have a signal which requires electrical operation. Where signals are used in cities, no difli culty is experienced in having a ready supply of current to operate the signals. In operating signals at rural crossings, however, it is often necessary to use batteries for supplying the current, and it is desirable to have a mechanism which will use a minimum amount of current when the signal is in inoperative'position. The signal is in inoperative position the greater part of the time in most cases, as the intervals between trains are often long.
It is an object of this invention, therefore, to
provide a simple and eflicient signal device particularly designed for use at railway crossings, and one which, will automatically display a stop signal when the train is approaching the crossing, and will return said signal to non-stop position after the train has passed.
It is another object of the invention to provide a signal device particularly adapted for use at railway crossings, having a signal adapted to be turned to stop and non-stop positions, said signal normally being held in non-stop position by a locking mechanism, means being provided for automatically turning said signal to stop position as soon as said locking means released, said locking means being held in position byan electro-magnet using very little current, a motor being provided which .is connected to said means to restore the signal to non-stop position and reengage the locking means and electro-magnet, the motor circuit being open when the signal reaches non-stop position, and being closed when the signal is moved to stop position.
It is more specifically an object of the invention .55 position and the train has passed, whereby the which is closed when the signal ismovedto stop motor will be actuated to turn said drum and raise the weight and again latch the same in position to restore the signal to non-stop position, the motor circuit again being opened when the signal reaches non-stop position.
It is another object of the invention to provide a signal having a sign adapted to be turned to stop and non-stop position, together with lamps displayed in proximity to said sign, which are periodically lighted and extinguished. 10
These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the accomsignal, the outer casing being shown in vertical section to reveal the parts therein, certain other parts being broken away and some shown in vertical section; t
Fig. 2 is a horizontal section taken on line 2--2 of Fig. 1;'
Fig. 3 is-a vertical section taken substantially on line 33 of Fig.2;
Fig. 4 is a horizontal section taken on line 44 of Fig. 3;
Fig. 5 is a horizontal section taken on line 55 of Fig.1, said sections being taken as indicated by the arrows;
Fig. 6 is'a view in front elevation of the signal;
Fig. 7 is a partial view similar to Fig. 6, showing the signal member in non-stop position; and Fig. 8 is a diagram of the wiring used.
Referring to, the drawings, a signal device is shown, comprising a base member 15 from which rises a standard 16, to which standard is secured a casing 17. The'casing 17 has a bracket 18 at its top having a central hub above which is oscillatably mounted the signal member proper 19. The bracket 18 also has at each side thereof and disposed at opposite sides of and somewhat below the member 19, lamps 20. While these lamps might be provided with lenses of various colors, such lenses preferably are made of red color and such color is indicated in the drawings. Arms 21 extend upward from bracket 18 at each side of the member 19, which arms converge above the member 19 and then extend vertically in contact, as shown at 21a. A pair of cross arms 22 are provided, shown as intersecting at right angles,
which arms have respectively thereon the words Railroad crossing".. Said arms 22 have a block 23 connected at the rear side thereof which. is clamped by a bolt or clip 24 to the arms 21. A
conduit 25 extends upward along one of the arms 21 and supports above the upper end of said arms a lamp 26, which lamp is provided with a shade or reflector 27. While the arms 21 may be variously made, in the embodiment of the invention illustrated they are shown as formed of T sections. The lamps 20 are also provided with reflectors 20a and preferably with forwardly projecting hoods 20b extending over their upper halves. It will be noted that the casing 17 is provided with a hinged door giving access thereto. A motor 28 is secured in the casing 17 having the members 29 secured to the armature shaft ber has a horizontal flange at its lower end sub- 1 stantially co-extensive with the horizontal flange at the upper end of the upper member 29; Friction plates 34 of fiber or similar material are disposed between the flanges on members 29 and 32 and below the latter, and headed and nutted bolts 35 extend through said friction platesand the flange on said member 32 and are surrounded by compression springs 36 bearing against the nuts on said bolts, and the lower plate 34, whereby members 29 and 32 are frictionally connected. The member 32 hasan upwardly projecting reduced portion on which is rotatably mounted a collar 37. Another collar 37ais rotatably mount ed on shaft 30 spaced above collar 37 and a plate 38 bent into U-shape at its end has the spaced arms of said U-shaped portion secured to collars 37 and 37a, said plate extending radially from the shaft 30. A ratchet member 39 is secured to shaft 30 between collars 37 and 37a, said ratchet being illustrated as having a pair of ratchet teeth or shoulders 39a at opposite sides thereof. The plate 38 has pivoted thereto by the headed and nutted bolt 40 passing through a spacing thimble 41, the pawl arm 42, said arm having a lip 42a turned downwardly therefrom, adapted at certain times to act as a pawl toothengaging the ratchet teeth 39a. The arm 42 is adapted to engage or be engaged by the pin 43 upstanding from plate 38 and to engage a pin 17c projecting downwardly from the auxiliary casing 170..
The arm 38 has an armature plate 44 secured to one side thereof at its outer end, adapted to form the armature for and be held in contact with the core member 45 of an electro-magnet coil 46. The frame member 47 comprises spaced rightangled plates 45a secured by headed and nutted bolts 48 to a plate member 49 secured to one side of a bracket 17d secured to casing 172). A multiplicity of thin plates 45b are disposed between the plates 4511, thus forming a laminated core. The shaft 30 extends through the lower portion of the auxiliary casing 17a and is journaled therein, and has a collar 50 secured thereto immediately within casing 17a. The collar 50 has a reduced portion on which is secured a pinion 51, with which mesh at opposite sides gears 52, which gears in turn mesh with an internal gear53 held in recesses in the auxiliary casings 17a and 17b. The gears 52 have the headed and nutted bolts 53a extending axially therethrough, which also extend through a block 54 having a projection 54a thereon and through a plate 55a forming part of the drum 55 disposed above and thus secured to said block. Stop screws 54b and 540 are threaded into casing 17b and positioned to be engaged by projection 54a. The shaft 30 has its upper 'end disposed in a recess in said block. The
block 54 has a reduced portion extending up through the drum 55 which is journaled in the ball bearings 31 and also has an angular portion 54d at its top extending through a similarly shaped recess in an arm 56, the terminal portion 54d being reduced and threaded to receive the nut 57 holding arm 56 in place. The drum 55 has a hookshaped clip 58 secured thereto (see Fig. 2) to which is secured one end of a-chain 59 which chain extends around said drum and passes out through one opening in casing 17b and over a sheave 60 secured on a plate 61 which is bolted to the side of the auxiliary casing 17b. The chain at its other end is pivotally secured to a plunger 62 extending through an opening in the top of a weight member 63. The weight member 63 has a bore or recess 63a extending thereinto from its bottom, into which plunger 62 extends, said plunger having an enlarged end 62a. substantially fitting in the recess 63a. A coiled spring 64 is disposed between the inner end of the portion 62a and the end of the recess 63a so that the weight 63 is suspended on said spring 64 and through the same, carriedbyplunger 62 and. chain 59. A plate 63b is secured to the side of the motor casing, adapted to. be engaged by the weight 63 when the same descends sufliciently. It will be seen that in the position of the parts shown in the drawings, the weight 63 is tending to revolve drum 55 and turn arm 56. A plate 65 is secured to the side of the casing 17b having a horizontal plate 66 secured to its outer edge, to which are riveted insulating blocks 67having adjustably secured thereto respectively, switch plates or contacts 68 and 69 and 68a and 69a having their adjacent ends curved outwardly. An arm 70 is pivoted on a pivot 71 secured in plate 65, which arm has a block of insulating material at its outer end having a convex surface to which is secured movable switch contacts or plates 72 and 72a. The arm 70 has a projection 70a from which upstands'a pin 73 adapted to be disposed in a recess 55c formed in the edge of the plate 550. Said plate 55a. also has a pin 74 depending therefrom, adapted to engage with another projection 70b on the arm 70, which projection extends beneath the plate 55a. The arm 70 also has a downwardly bent portion 700 to which is secured a piate spring 75, which spring is adapted at times to engage the end of arm 42.
The arm 56 has a cam roller 76 secured thereto; disposed in a groove 77a formed in an arm 77 secured to a stem 78 projecting upward through ball bearing 79 carried in the top member 18, which stem has a plate 78a. secured thereto extending over the top of the central hub of the top member 18 and having a depending flange extending thereabout.
The stem 78 and member 78a carry a bracket 80 bolted or riveted thereto, to which is secured the signal member proper 19, said member being in the form of a plate and illustrated as having the word Stop thereon. The, term signal member used in the claims designates the oscil-' latable parts above casing members 17 and 18.
In Fig. 8 is shown the diagrammatic arrangeto opposite poles of the battery 84. Conductors extend respectively from conductors 83 to the terminals of the winding of an electro-magnet 86, having an armature 86a. The armature 86a when in held up or closed position, engages the contact 87 from which extends a conductor 88 secured to a conductor 89 which extends from one winding of the electro-magnet 46 to the contact 680. A conductor 90- extends from the contact 69a to-one terminal of the motor 28. A conductor 91 is secured to armature 86a, and extends to one pole of the battery 92. A conductor 93 extends from the other pole of battery 92 to the other terminal of the motor 28. Another conductor 94 extends from the terminal of the electro-magnet 46 to conductor 93. A conductor 98 also extends from contact 68 to one side of a battery 100. A conductor 95 extends from the other side of battery to a flashing device 96, and conductors 97 extend from said flashing device to the lamps 20 and to a conductor 99 which extends from conductor 95 through a lamp 26 and is connected to contact 69. At switch 101 preferably is disposed in conductor 99 to control lamp 26. i
In operation the signal normally occupies the position shown in Figs. 1 to 5 and 7. At this time the electro-magnet 86 is energized by battery 84 and armature 86a. is in its attracted position as shown in Fig. 8. At this time the contact '72 is in engagement with contact 68 as shown in Figs. 1 and 2. The signal is in non-stop position with the edge of the signal plate proper 19 directed longitudinally of the highway so that the legend thereon, such as the word Stop is not visible to anyone approaching the crossing. The circuit through the electro-magnet coil 46 is closed by armature 86a and contact 8'7 and this electro-magnet holds its armature 44 in attracted position asshown in Fig. 5. The weight 63 is elevated and through the chain 59 normally tends to rotate the drum 55 and swing arm 56 to in turn swing arm 77a and turn the signal 19 to stop position with its flat side facing the highway. As shown in Fig. 4, arm 56 swings through about three-quarters of a revolution," and projection 54a engages screws 54b and 540 which form the stops. The plate 63b is provided to receive the weight 63 when it has just about reached its lowest position. The pawl arm 42 at this time has its lips 42a in engagement with one of the teeth 39a of a ratchet 39 and this prevents rotation of the drum 55 and descent of the weight 63. The signal is thus being held in non-stop position and the electromagnet coil 46 takes a very small amount of current. The battery 92 therefore need not be of very large voltage and will not be rapidly exhausted. This is a great advantage in rural districts where a ready supply of current is not available, as a battery of standard construction will operate the signal for a long period. The weight 63 tends to turn the signal, but the leverage tending to swing arm 38 to pull the armature 344 away from the electro-magnet coil 46 is quite disadvantageous so that once the armature 44 has been attracted, it is ample to hold the signal in its non-stop position. At this time the spring'75 engages the end of pawl lever 42 and swings the same inward toward the ratchet 39. It will be seen that with the parts in the position described, the circuit for motor 28 is opened at contact 69.
If a train nowcomes on the track 82 adjacent the signal, it will short-circuit to a certain extent the battery 84 so that very little current will be supplied to electro-magnet 86 which is of quite high resistance, and this electro-mag'net will be de-energized, thus permitting the armature 86a to be released and drop. When armature 86a is released the circuit through electro-magnet 46 is broken. This releases the armature 44 and weight 63 thus descends, turning drum 55 and through the gears 53, 54 and 51 turning the shaft 30. The shaft 30 in turning swings the arm 38 in a clockwise direction, and as drum 55 rotates, the cam surface at the side of recess 55c engages the pin 73 and cams the same out of said recess. This swings the arm 70 about its pivot 71, swinging the switch contact 72 and 72a into engagement with contacts 69 and 68a respectively, thus connecting these contacts. The motor circuit is closed at this point, but it will be seen that it is now open at armature 8611.
When the signal is moved to the stop position and arm '70 is oscillated as described, it will be seen that through the engagement of switch 72 and contacts 68 and 69 the lamps 20 will be lighted from battery 100. These lamps in practice are provided with red lenses, and the flasher 96 operates to alternately flash these lamps. The lamp 26 which preferably will be used at night is also illuminated and by the reflector 27 the light is thrown down on the face of the signal proper 19, so that the legend for halting traflic is brightly illuminated. The stop signal thus displayed comprises the stop sign 19, flashing red lamps of large size at either side thereof and the illumination from the lamp 26.
After the train has passed the signal, the short circuit is removed from the rails 82 and the battery 84 again energizes the electro-magnet 86, attracting armature 866. As the contacts 68a and 69a are now connected, the circuit for motor 28 is thus closed. The motor now draws current from battery 92 and is operated, turning the shaft 30 through the members 29 in a counter-clockwise direction. This, through the gears 51 and 52, turns block 54 and drum 55, again winding up the chain 59 and elevating the weight 63. When the drum 55 turns so that weight 63 is elevated to substantially the position shown in Fig. 1, the pin 74 engages the projection 70b of lever 70, swinging lever 70 so that contact 720 is swung out of engagement with contact 69a and into the position shown in Fig.2. As lever'70 is thus swung, the pin 73 is swung into the recess 550 in the position shown in Fig. 2. The circuit for the motor is thus opened. When the drum 55 was turned to wind up chain 59 and elevate weight 63, arm 56 was also turned, so that the signal proper 19 is again brought to non-stop position. Projection 54a engages screw 54b and theparts are stopped in proper position. In order that the motor will not be stopped with a sudden shock, the friction connection comprising members 32,
29, and 34 is provided. When the arm 54a thus engages its lug and is stopped suddenly, the motor can make a small further revolution through the slipping connection. When the shaft 30 was thus turned in a counter-clockwise direction by the motor, the arm 38 was swung through the friction of the collars 3'7 and 37a. on shaft 30 and armature 44 was swung overto engagement with the core of the electro-magnet coil 46. The electro-magnet coil 46 thus does not have to attract or swing the arm 38 and armature 44, but merely holds the same after it is engaged. When armature 38 is thus swung over to the electromagnet 46, the end of arm 42 engages the lower end of spring '75 and this spring swings the arm 42 so that its lip 4212 comes into the path of the pawl teeth 39a. The pawl and ratchet are thus engaged and the signal is again locked in nonstop position and the weight 63 is locked or held in elevated position. When the motor operates to raise weight 63 and move the signal to nonstop position and lever 70 is swung, switches 72 and 72a move out of engagement respectively with contacts 69 and 69a. This opens the motor circuit and also opens the circuit through the lamps 20 and 26 and the flasher 96. The parts are thus brought to the position shown in the drawings and as indicated in the diagram in Fig. 8.
The signal is now ready to be again operated upon the arrival of another train. It will be noted that the motor circuit is not closed except for the short period when the motor turns the drum 55 to wind up the chain 59. It will also be noted that when arm 77a is in its positions with the signal in stop or non-stop position, that it extends at right angles to the arm 56. The arm 56 thus cannot be turned by movement of the arm 77a and any person attempting to turn the signal 19 by hand to turn it to the wrong position, would be unable to turn the same.
It will be noted that should the battery current from either battery 84 or battery 92 for any reason fail, the signal will be moved to stop position. The electromagnet 46 will be de-energized and weight 63 will be released so that, as above described, the sign 19 will be turned to stop position and the lamps illuminated. This is a desirable feature in the signal.
From the above description it is seen that applicant has provided a very simple and efficient signal device particularly adapted foruse at railway crossings. With the mechanism described and operated from the battery 84 having the relay 46, the signal is held in its non-stop position by the use of a very small amount of current. As above stated, this is very desirable in many places where the signal is not operated so frequently. It is also quite important to have separate pairs of switches 68, 69 and '72, and 68a, 69a and 72a. .With thisarrangement the operating mechanism for the signalproper is on a separate circuit from the lamps 26 and 20 and the flasher for the latter. If the railroad should have a higher voltage line available, this line, such as 110 volt line, can be used instead of the battery and will be used to start the 'flasher 96 when the member 72 operates. There is thus quite an advantage in having the separate switches in the two circuits.
The device comprises compartively few parts and-the signal requires practically no attention whatever for maintenance. The device has been amply tested in actual practice, is being commercially marketed and is meeting with unusual success. It may be stated that the device, in an endurance test made at the factory, operated several hundred thousand times without attention or without developing any trouble whatever.
It will, of course, be understood that various changes maybe made in the form, details, arrangement and proportions of the parts, without departing from the scope of applicant's invention, which, generally stated, consists in a device capable of carrying out the objects above set forth, in the novel parts and combinations of parts disclosed and defined in the appended claims.
What is claimed is:-
l. A railway signal having in combination, a. signal member adapted to'be turned to stop and non-stop positions, means for moving said signal to non-stop position including a shaft, 9.
member carried by said shaft, a swinging arm having a locking means for engaging said member to hold said shaft in position when said sig-- nal is in non-stop position, and an electromagnet for holding said arm in position with said ing arm being mounted on said shaft and moved thereby to a position close to said electro-magnet when said signal is moved to non-stop" position whereby said electro-magnet can magnetically attract said arm and thus can'have a small current energizing the same.
3. A signal device having in combination, a signal member movable to stop and non-stop positions, a shaft for turning said signal member, an arm secured-tosaid shaft for turning the same, automatically acting mechanical means normally tending to turn said arm to move said signal member to stop position, a second shaft for turning said arm, a member carried by said shaft, a movable arm having holding means engaging said member, an armature movable with said arm, an electro-magnet for holding-said arm in position with said means and member engaged when said electro-magnet is energized to hold said signal member in non-stop" position, a circuit for said electro-magnet, means for maintaining said circuit closed when said signal member is in nonstop position and for opening said circuit when said signal member is to be moved to stop position to permit said mechanical means to rotate said second shaft, move said signal member to stop position, move said armature away from said electro-magnet and release said member and said holding means, and means to subsequently rotate said second shaft to turn said signal member to non-stop position and energize said electromagnet to hold said armature with said holding ible member secured to said weight and adapted tobe wound on said drum.
5. A signal device for a railway crossing having in'combination; acasing, a signal member oscillatable about a vertical axis anddisposed at the top of said casing and formed with a face of wide and arrestive appearance extending transversely of the highway when said signal is in stop position and an edge of narrow and non-arrestive appearance directed longitudinally of the highway when the signal is in non-stop position, a shaft secured to said signal member and extending downwardly into said casing, an arm to said shaft, a second shaft oscillata-ble in said casing about an axis spaced from said first mentioned shaft, a second arm securedto said last mentioned shaft and connected to said first mentioned arm, stops for determining the stop and non-stop positions of said signal member, a motor in said casing for moving said signal to nonstop position and having an armature shaft axially aligned with said'second shaft and, means connecting said armature shaft and second shaft adapted to slip when said last mentioned arm engages one of said stops so that said motor can make several revolutions thereafterand gravitysition at the desired time.
6. A signal device for a railway crossing having in combination, a casing, a sign plate oscillatable about a vertical axis and disposed at the top of said casing and formed with .a face of wide and arrestive appearance extending transversely of the highway when said signal is in stop position and an edge of narrow and non-arrestive appearance directed longitudinally of the highway when the signal is in non-stop position, a shaft secured to said sign plate and extending downwardly into said casing, an arm secured to said shaft, a second shaft oscillatable in said casing about an axis spaced from said first mentioned shaft, means connecting said second shaft and said arm for turning said arm and the sign plate, a. drum secured to said second shaft, a flexible member secured to said drum adapted. to wind thereon, a weight secured to said flexible member normally tending to turn said drumand move said sign plate to stop position,'a motor in said casing having an upwardly extending armature shaft connected to said second shaft adapted to move said sign plate to non-stop position and means for holding said second shaft and sign plate in nonstop position, said last mentioned means comprising an arm swinging about the axis of said second shaft, a stop member mounted on said second,
actuated means for moving said signal to stop poshaft, a pawl carried by said arm adapted to engage said stop member, an armature carried by said armand a magnet coil to which said armature is moved adapted to hold said armature and arm" with the pawl and stop member engaged and said signal in non-stop position.
7. A signal device having in combination,- a frame, a signal member movable about a-vertical axis to stop and non-stop positions, means connected to said signal member normally tending to move said signal to stop position, a stationary electro-magnet secured to said frame, means constructed and-arranged to hold said first mentioned means against its tendency. to move said signal to stop position with the signal in non-stop position, a swinging armature member for said electro-magnet carrying said holding means, means for energizing said electro-magnet, and means for moving said' signal to non-stop position and movingsaid armature adjacent said electro-" magnet.
' 8. A signal device for railway crossings having in combination, a signal member movable to stop and non-stop positions, an arm for moving said signal, a motor driven shaft for turning said arm,
atu'omatically acting mechanical means normally tending to turn said arm to move said signal to stop position, a member carried by said shaft, means engaging said member, an electro-magnet, an arm oscillatable on said shaft carrying said last mentioned means for positioning the same to engage said member to hold said signal in nonstop position, an electro-magnet for holding said arm in position with said means and member engaged when said electro-magnet is energized, a circuit for said electro-magnet, means for clos- .ing' said circuit when said signal non-stop position and for opening said circuit when said signal is to be moved to stop position. A
9. A'signal device for railway crossings having in combination, a signal member oscillatable to stop and non-stop positions, means normally tending to turn said signal 'to stop position, means for holding said signal in non-stop position including a stationary electro-magnet, an armature therefor, an arm swingable by said signal carrying said armature, a pawl carried by said arm, a rotatable member movable with said sig-.
nal. adapted to be engaged by said pawl, means for moving said signal to non-stop position and swinging said arm to a position adjacent said electro-magnet, means actuated by said arm for causing engagement of said pawl and last mentioned member and permitting attraction of said armature by said electro-magnet, and means for energizing said electro-magnet when said armature is adjacent the same to hold said swinging arm in'position with said pawl and last mentioned member engaged, and for deenergizing said electro-magnet to release said armature for said arm to be swung by said signal to release said pawl.
10. A signal device for railway crossings having in combination, a signal member movable to stop and non-stop positions, a shaft, means for turning said shaft to move said signal to stop and non-stop positions, mechanical means normally tending tomove said means to stop position, a holding member connected to said shaft, an arm freely and frictionally rotated on said shaft, a pawl swingingly mounted on said arm to engage said member to hold said shaft with said signal in non-stop position, an electro-magnet for hold ing said arm in position with said pawl and ratchet engaged, said mechanical means swinging said arm away from said electro-magnet when said signal is swung to stop position to cause said pawl and member to become disengaged and swinging said arm toward said electro-magnet when said signal is moved to non-stop position to cause said pawl" and member to be engaged.
11. A signal device having in combination, a casing, a signal member oscillatable about a vertical axis and disposed at the top of said casing movable to stop and non-stop positions, a shaft secured to said signal member and extending downwardly into said casing, a second shaft mounted in said casing about an axis spaced from a third gear meshing with said planetary gear,
a shaft connected to said third gear for rotating the same, a motor in said casing having a verti-.
cally disposed armature shaft alined with said last mentioned shaft to drive said third gear, and operate said drum and signal member.
12. A signal device having in combination, a
casing, a signal member disposed above. said casing and oscillatable about a vertical-axis to stop and non-stop positions, a shaft secured to said plate and extending downwardly into said casing, rotatable means in said casing connected to said shaft for turning said signal member to stop position, a planetary gear having an orbit gear secured to said casing, a driven gear secured to said last mentioned means, a driving gear, a shaft extending downwardly from said driving gear, a motor rotatable in one direction and having a vertically disposed armature shaft alined with said last mentioned shaft for rotating said driving gear for turning said signal to non-stop position and gravity-actuated means for turning 'said signal to stop position at the desired time.
arm for moving said signal to stop and nonstop positions, a shaft connected to said am, a memberconnected to said shaft for turning the same, means connected to said last mentioned member normally tending to move the same and move said signal to stop position, a member connected to said shaft, a latch for engaging said last mentioned member to hold said shaft and first mentioned member against being moved by said means, said latch comprising a swinging member forming an armature, an electromagnet adapted tohold said armature when the same is moved into contact therewith to maintain said latch in holding position, a motor connected to said shaft for turning the same, said arm and first mentioned member to move said signal to non-stop position against the force of said means and also to move said swinging member to said electromagnet and switch means actuated by said shaft and first mentioned member for closing and opening a circuit for said motor.
FRANK W. GRISWOLD.