US2011316A - Signal of automatic type for railway crossings - Google Patents

Description

1935. F. w. GRISWOLD 2,011,316

SIGNAL OF AUTOMATIC TYPE FOR RAILWAY CROSSINGS Filed Aug. 9, 1 3 5' Sheets-Sheet 1 1935. F. w. GRISWOLD 2,011,316

SIGNAL OF AUTOMATIC TYPE FOR RAILWAY CROSSINGS Filed Aug. 9; 193 5 Sheets-Sheet 2 I w. l

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Aug. 13; 1935. F. w. GRISWOLD SIGNAL OF AUTOMATIC TYPE FOR RAILWAY CROSSINGS Filed Aug. 9, 1930 5 Sheets-Sheet 4 3, 1935- F. w. GRISWOLD 2,011,316

SIGNAL OF AUTOMATIC TYPE FOR RAILWAY CROSSINGS Filed Aug. 9, 1930 5 Sheets-Sheet 5 Patented Aug. 13, 1935 UNITED STATES PATENT OFFICE SIGNAL 0F AUTOMATIC TYPE FOR RAILWAY CROSSINGS Application August 9, 1930, Serial No. 474,117

15 Claims.

This invention relates to a signal device, and while the device may be disposed at various places, it particularly is designed for use at railway crossings, where a thoroughfare crosses the railway. It is desirable at such crossings to have an automatic signal which will be turned to stop position when a train is approaching and which will be moved to non-stop position when a train has left the vicinity of the crossing. It is also desirable and convenient to have such a signal electrically. operated and it is desirable to have a signal operated with a minimum of current. Such a signal should also be simple, compact and reliable in operation.

It is an object of this invention, therefore, to provide a simple, eflicient and compact automatic signal for railway crossings which will automatically display a stop signal when a train is adjacent the crossing, and which will return tononstop position after the train has left the vicinity of the crossing.

It is a further object of the invention to provide a signal device for use at railway crossings having a signal which will normally be held in non-stop position but which has a weight movable vertically and actuating the signal through a cam to move it to stop position when the train comes in the vicinity of the crossing, together with motor driven means automatically set in operation after the train has departed to elevate said weight and again move the signal to nonstop position.

It is a further object of the invention to provide a signal for use at railway crossings which will normally be held in non-stop position, but will be moved by gravity operated means to stop position when the train comes in the vicinity of the crossing, together with motor driven means for moving the signal to non-stop position after the train has departed, including a clutch, which clutch is disconnected when the signal moves to stop position but is connected when the signal is returned to non-stop position. J

It is still another object of the invention to provide a simple and eflicient automatic signal device for railway crossings having gravity operated means for moving the signal to stop position when a train approaches, and motor driven.

It is a further object of the invention to provide a signal device for railway crossings having a signal plate with a face of wide and arrestivo appearance and an edge of narrow and nonarrestive appearance movable about a vertical axis to stop and non-stop positions, together with a vertically movable weight and cam operated thereby to move said signal, said weight preier- 5 ably having a rack thereon so that it can be elevated by means of a gear.

These and other objects and advantages of the invention will be fully set forth in the following description made in connection with the i0 accompanying drawings in which like reference characters refer to similar parts throughout the several views and in which,

Fig. 1 is a view in front elevation of the complete signal;

Fig. 2 is a vertical section through the frame casing used, showing parts within said casing;

Fig. 3 is a vertical section taken substantially on line 3-3 of Fig. 2;

' Fig. 4 is a vertical section taken on line 4-4 20 of Fig. 3;

Fig. 5 is a section taken substantially on line 55 of Fig. 3;

Fig. 6 is a section taken on line 6-6 of Fig. 5, some parts being broken away and others shown 25 in horizontal section;

Fig. 7 is a horizontal section taken on line 'I-l of Fig. 5, certain parts being indicated in dotted lines; and

Fig. 8 is a view of the wiring diagramfor the 30 device.

Referring to the drawings, a signal device is shown comprising a base member l0, having a flange Ilia at its bottom adapted to engage a supporting surface, said base member prefer- 3 ably being made in two parts connected by headed and nutted bolts II and having a central opening adapted to receive a standard I! engaged by a coupling collar I! having screws ll extending therethrough and which supports a 40 casing {5. While the casing l5 might be of various shapes, in the embodiment of the invention illustrated, it is shown as rectangular in form having a curved tapered top portion lie through which extends a shaft l6 carrying a sig- 45 nal plate l1. While the signal plate might be variously made, it is shown as made of a thin plate so that it has an edge of narrow and nonarrestive appearance; Said plate I! is illustrated as of octagon shape and has the legend stop" 50 on its flat side, the same therefore, having a face of wide and arrestive appearance. Casing II has brackets l8 secured thereto at its 'upper corners and extending vertically, which support lamps II which will preferably be provided with shields 28 and with red lenses 2|. Brackets or bars 22 extend vertically from brackets I8 and support the crossed plates or timbers 23 at their upper ends, said plates 23 being shown as extending substantially at right angles to each other in upwardly inclined directions and having thereon the legend or words Railroad crossing. A bracket 24 extends upwardly from the central crossing points of plates 23 and supports a lamp bracket and conduit 25 including a socket in which is supported a depending lamp 26, the same being provided with a reflector 21 adapted'to direct the light on the plates 23 and I1.

Shaft l6 extends through a cup-like plate 28 having its convex surface directed upwardly and resting on the top of casing I5. Casing |5 has a hub |5b at its upper end in which are secured bushings 29 in which shaft I6 is journaled. Shaft |6 has secured to its lower end a cylindrical cam 38. Cam 38 is shown as being hollow and threaded at its lower end on the lower end of shaft l6, a nut [6a being threaded on said shaft below cam 38 and pinned to said shaft. Cam 30 is provided with a downwardly extending and helical groove 38a extending through a quarter turn about said cam 38 in which is disposed to travel a roller 3| carried on a headed and nutted bolt 32 extending diametrically through the top of a comparatively long cylindrical weight 33. Collars 34 are disposed at either side of roller 3|, a washer 35 preferably being disposed under the nut of bolt 32. Weight 33 has grooves 33a in its opposite sides into which project rollers 36 having trunnions 36a journaled in brackets 31, the latter having flanges secured respectively to plates 38 and 39 suitably supported. in casing l5.

There are two rollers 36 vertically spaced at each side of weight 33 and these form guides for said weight. Weight 33 has one side formed as a rack 33b with which rack meshes a pinion 48. Pinidn 40 is secured to a shaft 4|. Shaft 4| is journaled at one end in a bearing 42 having a flange also secured to plate 38. Shaft 4| is journaled in its other end in a bearing 34 having a flange secured to a plate 44 and having a hub projecting through said plate. Shaft 4| also has secured thereto a comparatively large spur gear 45 which meshes with a pinion 46 secured to a shaft 41 journaled at one end in a bearing 48 similar to bearing 43, the same having a flange secured to plate 44 and a hub projecting through said plate. Shaft 41 has pinned thereto a cylindrical member 49 forming one member of a clutch, the same having an annular groove 49a in one side into which projects a stud 58 secured in member 49. Shaft 41 beyond member 49 is reduced and extends into another rotatable member 5| of cylindrical shape having secured thereon and rigid therewith a ring 52. Member 5| has a rectangular slot at its edge in which is slidable a key or dog 53 having an outwardly projecting arm 53a. Arm' 53a in horizontal cross section, is shaped, as shown in Figs. 6

and 7, its outer side 53b being on an incline, while 56 secured to the armature shaft 51 of en 'elec-- tric motor 58 supported upon a plate 59 secured in one end to plate 39 and suitably supported at its other end by a rod 68 having nut 6| thereon at either side of plate 59. A ratchet wheel 62 is secured to shaft 41 between members 46 and 49, said ratchet wheel, as shown in Fig. 4, being formed with one or more teeth 62a. A pawl 63 has a tooth 63a.adapted to engage tooth 62a, said pawl being pivotally mounted on a stud 64 secured to a bracket 65, which is carried on collars 66 journaled on shaft 41. A pin 63b is secured in and projects from plate 44 into the path of movement of pawl 63 as bracket swings about shaft 41. Bracket 65, as shown in Fig. 3, is formed by bending a,.flat piece of sheet metal into U shape at one end, said piece of metal and bracket extending downwardly at one side and having an armature block 65a secured thereto adapted to cooperate with the core 61a of an electromagnet 61, said core having parallel arms and said magnet coil 61 being disposed on one of said arms. Members 61 and 61a are secured by screws 69 to a plate 68 extending between plates 44 and 38. A switch 18 comprising a movable contact 18a is provided, said contact being secured in a plate 1| of insulating material and having secured thereto a conductor 12. Plate 1| is secured to an arm 13 pivoted on a pin 14 projecting from plate 44, said arm having pivotally secured at its end a link 15, which is in turn pivotally secured at its other end to a lever 16, which is pivoted at its opposite end 16a to plate 44. Lever 18 is disposed so as to be engaged by a pin 11 secured to gear 45. Arm 13 has a cylindrical projection to which is secured a flat spring 18 adapted to be engaged by pawl 63. The fixed contact 18b of switch 10 is secured in a plate 19 projecting from plate 44 and said contact has connected thereto a conductor 88.

An electromagnet 8| is provided comprising a coil mounted on one of the parallel arms of a core member 82 secured to plate 39 by means (not shown). A lever 83 in the form of a flat plate is provided, the same being pivoted at one end wardly, which is triangle-shaped as shown in Fig.

7. Plate 83 is arranged to drop by gravity about its pivot 84 when magnet 8| is not energized and is thrown up to the position shown in Fig. 5 when magnet 8| is energized. Casing I5 is open at one side as shown at I50 and a. door (not shown) is hinged to said casing for giving access thereto. Plates 38, 39 and 44 are shown as connected by a plurality of headed and nutted bolts 86 extending therethrough and between the same.

Referring to Fig. 8, the wiring diagram for the device is shown. The rails 98 of the railway track are indicated, from which extend conductors 9| extending to opposite sides of battery 92. An electromagnet 93 is provided and conductors 94 and .95. extend respectively from the conductors 9| to opposite ends of the winding of said magnet. 'An armature 96 is adapted to be attracted by magnet 93 and engage a contact 81 when magnet 93 is energized. A conductor 98 extends from contact 91 to one end of the winding of magnet coil 61. v The conductor 12 extends from conductor 98 through the movable contact of switch 10 and a conductor 80 extends from the stationary contact of switch 10 to one end of the winding of magnet coil 8 I. The other end of the winding of coil 8I is connected by a conductor 82 to one terminal of motor 58. The other terminal of motor 58 is connected by a conductor IN to one side of battery I02 or one side of an electric line leading to a suitable source of electric energy. The other side of battery I02 or of the electric supply line is connected by conductor I04 t armature 96 forming the movable contact engaging contact 91. A conductor I03 extends from conductor IOI. to the other end of the winding of magnet coil 61.

Assuming the signal is in non-stop position, plate I1 will have its edge directed longitudinally of the highway so its flat side with the word stop thereon will not bevisible to traflic approaching the crossing. At this time, magnet coil 93 is energized by battery 92 and armature 96 is attracted and engages contact 91. Magnet coil 93 is of considerable resistance. It will be seen that a circuit is now closed through magnet coil 61. This circuit can be traced from one side of battery I02 through conductor I04, armature 96 contact 91, conductor 98, conductors I03 and IOI to the other side of battery I02.- Magnet coil 61 is, therefore, energized and arma- -ture 65a is held against collars 66, thus holding arm 65 in position. Tooth 63a. engages tooth 62a of ratchet wheel 62 and said wheel, together with shaft 41 is thus held from rotation. Weight 33 is elevated, as shown in Fig. 2, and tends to drop and is thus exerting rotational stress on' gear 40, which stress is transmitted through gears 45 and 46 to shaft 41. Weight 33 is, therefore, tending to move wheel 62 and holds the same against pawl 63. At this time, gear 45 is in position to move pin 11 against lever 16, thus elevating the outer endof arm 13. and thus separating contacts 10a and 10b. When a train comes on the track in the vicinity of the signal, the same completes a circuit between the rails and through conductors 9|, and magnet 93 is short circuited and-deenergized. This allows armature 96 to drop, thus disengaging contact 91. The circuit through magnet coil 61 is now broken and bracket 65 is no longer held by the armature block 65a, weight 33 acting through the gearing and turning shaft 41 and ratchet wheel 62. Owing to the engagement of tooth 621: with the pawl tooth 63a, bracket 65 swings the shaft 41 in a counterclockwise direction. This movement of bracket 65 continues until the end of pawl arm 63 engages pin 63b. When this occurs, pawl arm 63 is moved relatively to arm 65 and tooth 63a is withdrawn from engagement with ratchet wheel 62. The weight 33 continues to drop, rotating shaft 41 as it does. As weight 33 drops, the cam roller 3|, acting on cam groove 30a. rotates cam 30 and shaft I6 so that signal plate I1 is rotated ninety degrees and its flat side is brought into position perpendicular to the highway so that itis displayed to traffic. 'Iraflic is now warned that a train is approaching and the signal is in its stop position. When weight 33 moves down and shaft 41 is turned after the signal moves to its stop position, dog 53 is withdrawn from members 49 so that .the clutch formed by members 49 and is disengaged. Member 5| and gears 54 and 56 and armature shaft 51 are, therefore, not turned as weight 33 descends in moving the signal to stop position. The signal remains in its stop position until the train departs from the vicinity of the crossing. When this occurs, the circuit is broken through conductors 9I and rails 90 and battery 92 again energizes magnet 93. Magnet 93 attracts armature 96 which again engages contact 91. The motor circuit is now closed, switch 10 having closed, as said switch closes by gravity. The closing of the motor circuit energizes the magnet 6| which is in the motor circuit. When this magnet 8| is energized armature block 85 is attracted and lever 63 is raised about its pivot 84. This brings cam 83d into alinement with projection 53a on the dog 53, and as member 5I revolves carrying with it dog 53, projection 53a will engage cam portion 83d, as shown in Fig. 7 and this will push 'dog 53 toward member 49 and into the groove 49a. Dog 53 is thus moved into alinement with pin 50 and will rotate member 49 and shaft 41 through the' pin 50. The motor now is driven and turns gear 54, member 5I and shaft '41, as first described, thus turning pinion 46, gear 45 and shaft 4| so that pinion 40 acts on the rack 33b of weight 33 and said weight is elevated. As said weight is elevated cam 30 is again turned and signal plate I1 turned ,ninety degrees so that its edge is nowrdirected longitudinally of the highway. When weight 33 is substantially in its upper position, pin 11 on gear 45 engages lever 16, thus elevating link 15 and the outer end of arm 13 and depressing the movable contact 100. so that the motor circuit is opened at switch 10. The motor thus has its current shut off and magnet 8I is deenergized. Armature block 85 is released and lever 83 drops so that the cam portion 830 is brought into alinement with projection 53a of dog 53 and cam portion 63d moves out of the path of projection 53a. The motor 58 revolves slightly after the current is shut off and this is usually suflicient to move dog 53 away from member 49 and out of the path of pin 50. The clutch, comprising members 49 and 5| is thus disengaged. If this clutch should not be disengaged before the motor stops, it will be disengaged in the first movement .of shaft 41, due to weight 33 when the signal is moved to stop position. When the train leaves the vicinity of the signal, the circuit is again closed through magnet 61 and armature 65a is held against magnet core 61a-so that arm 65 cannot move. When lever 16 .is moved upwardly, spring 18 engages pawl arm 63 and moves the same so that tooth 62a, of ratchet wheel 62 engages tooth 63a of the pawl and the signal is thus again locked in non-stop position with weight 33 elevated. It will be seen that ratchet wheel 62 acts on arm 65 at a very disadvantageous leverage so that a great force is not necessary for magnet 61 to hold bracket or arm 65in position. When the train is in the vicinity of the signal the lamps I9 are illuminated and preferably flashed alternately to assist in the warning signal at night. It will be seen that plate 55 acts to guide lever 83 in its oscillating'movement.

From the above description, it will be seen that applicant has provided a very simple and emcient signal device particularly adapted for a'railway crossing. The signal is entirely automatic and works on very little current. It will be noted that current is only on the motor during the short time it is used to return the signal to non-stop position. The winding of magnet 61 is arranged to take very small current and, as stated, little current is needed to hold the signal in its non-stop position. It will also be seen that should current to magnet 6'! be discontinued, for any reason, the signal will immediately move to stop position, thus warning the trafiic of the crossing. By the provision of the clutch comprising members 49 and 5| it is not necessary for the weight to move all of the mechanism when it moves downward to move the signal to stop position. The mechanism is all housed within the comparatively small casing l5 and the same is .comparatively simple and very compact. The device has been amply demonstrated in actual practice and found to be very successful and efliclent;

It will, of course, be understood that various changes may be made in the form, details, ar-

rangement 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:

1. 'A signal device for railway crossings having in combination, a signal movable to stop and non-stop positions a weight actuated by gravity for moving said signal to stop position, means for holding said signal in non-stop position and against said movement including a stop member, a pawl engaging said member, said pawl being pivoted for swinging movement, means for raising said weight and moving said signal to non-stop position including a motor, a circuit for said motor, a switch in said circuit, means operated by said last mentioned means when the signal is moved to non-stop position and the weight elevated for opening said switch, and means actuated by said last mentioned means for moving said pawl into position to engage said ratchet.

2. A signal device for railway crossings having in combination, a frame, a signal member movable to stop and non-stop positions, a vertically movable weight actuated by gravity and means operated thereby for moving said signal member to stop position, said weight having a rack thereon, a pinion meshing with said rack, a shaft to which said pinion is secured, means for rotating said shaft to move said signal to non-stop position, including a motor, a circuit for said motor, a switch in said motor circuit, a lever carrying one contact of said switch, members connected to said lever for raising the same and opHnng saidswitch, and a member rotatable with said shaft for engaging one of said last mentioned members for moving the same and raising said lever.

3. A signal device for railway crossings having in combination, a frame, a signal plate oscillatable about a vertical axis to stop and non-stop positions, a vertical shaft journaled in said frame turnable with said signal plate, a cam cylinder on said shaft having a helical cam groove therein, a weight movable vertically and having means engaging said groove to turn said cam and shaft by vertical movement of said weight, means for preventing rotation of said weight, motor driven means for elevating said weight to turn said sig nal plate to non-stop position, means for holding said motor driven means in the non-stop position of said signal plate,'and means for rendering said last mentioned means inoperative to hold said motor driven means, whereby to permit said shaft supporting said signal member,

weight to drop and turn position.

said signal plate to stop in combination, a frame, a signal plate oscillatable about a vertical axis to stop and non-stop positions, a vertical shaft journaled in said frame turnable with said signal plate, a cam member on said shaft having a helical cam groove therein, a weight movable vertically and having means engaging said groove to turn said cam member and shaft by vertical movement of said weight, means for preventing rotation of said weight, a. rack upon said weight, motor driven means including a pinion meshing with said rack for elevating said weight to turn said signal plate to non-stop position, means for holding a part of said motor driven means in the non-stop position of said signal plate, and means for releasing said holding means from said mentioned part of said motor driven means to thus permit said weight to drop and turn said signal plate to stop position. I

5. A signal device for railway crossings having in combination, a frame, a signal member movable to stop and non-stop positions, a vertically movable weight actuated by gravity to produce force for moving said signal member to stop position, said weight having a rack thereon, a pinion meshing with said rack, a shaft to which said pinion is secured, a second pinion, a comparatively large gear on said shaft meshing with said second pinion, a second shaft to which said second pinion is secured, a second comparatively large gear upon said second shaft, a pinion meshing with said last metioned gear, a motor for driving said last mentioned pinion, a clutch mounted on said second shaft for detachably connecting said second comparatively large gear to said second shaft, and means for disengaging said clutch when said signal member is moved to stop position by said weight and for engaging said clutch when said motor is actuated to move said signal member to non-stop position.

6. A signal device for railway crossings having in combination, a signal member turnable to stop and non-stop positions, gravity actuated means including a weight for turning said signal member to stop position, a connection between said weight and said signal member, means for holding said signal member in non-stop position with said weight elevated, and motor driven means for elevating said weight to turn said signal member to non-stop position, said motor driven means including a clutch and a pinion, and said weight including a rack engaged by said pinion.

7. A signal device for railway crossings having in combination, a frame, a signal member turnable to stop and non-stop positions, a vertical gravity actuated means including-a weight for turning said signal member to stop position, means for guiding said weight for vertical movement and preventing rotation thereof, a cam and follower connection between said weight and said vertical shaft, means for holding said signal member in non-stop position with said weight elevated, and motor driven means for elevating said weight and turning said signal member to non-stop position, said motor driven means including a rack and pinion driving connection with said weight.

8. A signal device for railway crossings having in combination, a frame, a signal member turnable to stop and non-stop positions, a vertical shaft supporting said signal member, gravity actuated means including a weight for turning said' signal member to stop position, means for guiding said weight for vertical movement and preventing rotation thereof, a cam and follower connection between said weight and said vertical shaft for turning said shaft 90 degrees upon vertical movement of said weight, means for holding said signal member nonstop position with said weight elevated, andand shaft by vertical movement of said weight, said shaft being turned to move said signal plate to stop position by downward movement of said weight and to non-stop position by upward movement of said weight, means for preventing rotation of said weight, a second shaft mounted in said frame, means connecting said shaft and said weight whereby said second'shaft is placed under stress to rotate when said weight is in'elevated position, means preventing rotation of said second shaft to hold said signal in non-stop position and said weight in elevated position including a swinging arm having an armature thereon and a magnet for holding said arm in position, means for energizing and deenergizing said magnet and means for raising said weight and moving said signal to non-stop position.

10. A signal devicefor railway crossings having in combination, a frame, a signal plate oscillatable about a vertical axis to stop and non-stop positions, a vertical shaft journaled in said frame turnable with said signal plate, a cam member on said shaft having a helical cam groove therein, a weight movable vertically and having means engaging said groove to turn said cam member and shaft by vertical movement of said weight, said shaft and signal plate being moved to stop position by downward movement of said weight and to non-stop position by upward movement of said weight, means for preventing rotation of said weight, a second shaft, gearing connecting said second shaft to saidweight, whereby said second shaft is placed under stress to rotate when said weight is in elevated position and said signal s in non-stop position, means holding said second shaft against rotation including a rotatable stop member thereon, a pawl engaging said member, arms swingable on said. shaft carrying said pawl, an armature on said arm and an electromagnet for engaging said armature, means for energizing and deenergizing said magnet, and means for raising said weight and moving said signal to non-stop position. 11. A signal device for railway crossings hav ingin combination, a frame, a signal member movable about a vertical axis to stop and nonstop positions, a weight, means for. confining the movement of said weight to vertical rectilinear movement, a cam and follower connection between said weight and signal member whereby movement of said weight vertically downward will oscillate said signal member to stop position and movement of said weight upward will move said signal member to non-stop .position, a magnet controlled stop means for signal member to non-stop position including a clutch, means for disconnecting said clutch when said weight drops and moves said signal member to stop position and means for engaging said clutch when said signal member is to be moved to non-stop position.

12. A signal device for railway crossings having in combination, a frame, a signal member oscillatable about avertical axis tostop and mm stop positions, a shaft carrying said signal member, a drum on said shaft, a weight, means for confining the movement of said weight to vertical rectilinear movement, a connection between said weight and drum oscillating said drum 90 degrees when said weight moves vertically through its range of movement, a rotatable shaft, gearing between said weight and shaft construct ed and arranged to rotate said shaft when said 1 means and shaft, said clutch being connected to permit said motor to elevate said weight and move said signal to non-stop position.

13. A signal device for railway crossings having in combination, a frame, a signal member mounted in said frame and oscillatable about a vertical axis to stop and non-stop positions, a weight, means for confining the movement of said weight to vertical rectilinear movement, a connection between said weight and signal member constructed and arranged to move said signal member to stop position when said weight moves downward and to move said signal member to non-stop position when said weight moves upward, means including an electromagnet for holding said weight elevated and said signal in non-stop position, means for deenergizing said magnet and permitting said weight to drop and move said signal member to stop position, means for moving said signal member to non-stop position including a motor, a circuit for said motor, a switch in said circuit, means for closing said switch when said signal member is moved to stop position, means for connecting said motor and third mentioned means including a clutch, a control member for said clutch, a magnet in said motor circuit for actuating said'control member and means operated when said signal member reaches non-stop position to open said switch and energize said first mentioned electromagnet to hold said signal member in non-stop position.

14. A signal member for railway crossings having in combination, a frame, a signal member, a shaft mounted in said frame carrying said signal member and oscillatable about a vertical axis, a drum on said shaft, a weight, means for guiding said weight for vertical and rectilinear movement and preventing rotation thereof, a cam and follower connection between said weight and drum causing oscillation of said shaft and signal through 90 degrees in the vertical movement of said weight, said signal member being moved to stop position by downward movement of said weight and to non-stop position by upward movement of said weight, a second shaft, gearing including a rack on said weight connecting said second shaft and weight, a third shaft, gearing connectingsaid second shaft and said third shaft whereby said third shaft is placed under tendency to rotate when said weight is elevated, a

member on said third shaft, a pawl engaging said member to prevent rotation of said third shaft and hold said weight elevated, means for moving said pawl to permit said weight to descend and move said signal to stop position and a motor for subsequently elevating said weight and moving said signal to non-stop position.

15. A signal member for railway crossings having in combination, a casing having a base adapted to rest on the ground, a vertical shaft journaled in said casing and projecting at the top thereof, a signal having a face of wide and arrestive appearance and an edge of non-arrestive appearance secured to said shaft above said casing and disposed above said casing for oscillating movement about a vertical axis to stop and nonstop positions, a weight movable downwardly by gravity in said casing, means confining the movement of said weight to a vertical rectilinear movement, a cam and follower connection between said shaft and weight for rotating said shaft upon vertical movement of said weight, said weight having a rack formed thereon, a gear meshing with said rack and means for driving said gear to elevate said weight, rotate said shaft and move said signal to non-stop position.

FRAN W. GRISWOLD.

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