US1561047A

US1561047A - Car dump

Info

Publication number: US1561047A
Application number: US551158A
Authority: US
Inventors: Vernor T Barkley
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-04-10
Filing date: 1922-04-10
Publication date: 1925-11-10
Anticipated expiration: 1942-11-10

Description

Nov- 10 1925 v. T. BARKLEY CAR DUMP Filed April 10, 1922 6 Sheets-Shet. 1

Nov. 10, 1925 V. T. BARKLEY CAR DUMP Filed April 10, 1922 6 Sheets-Sheet 2 INVENTOR i k z Nov. 10, 1925 v. T. BARKLEY cm DUMP Filed April 10, 1922 6 Sheets-Sheet 3 INVENTOR Nov. 10, 1925- v. T. BARKLEY CAR DUMP Filed April 10, 1922 6 Sheets-Sheet 4 Nov. 10, 1,561,047

V. T. BARKLEY CAR DUMP Filed April 10, 1922 6 Sheets-Sheet 5 FIG. 5

I I7 24. 8? /5 I I I 2/ .94 93 i Bis \La 1 h -a' o I J I 95 54 M 1 a 1 s l .3 l 62 85 1, 3 86 6/ T I I I /40 I2 f i VENTOR Nov. 10, 1925 1,561,047"

V. T. BARKLEY CAR DUMP Filed April 10, 1922 6 Sheets-Sheet 6 I F\G.1O

Patented Nov. lit), 1925.

UNETED STEtTE PATENT QFFifiE.

VERNOR T. BARKLEY, (3F EITTSBUBGI-I, PENNSYLVANIA.

can DUMP.

Application filed April 10, 1922.

T 0 all whom it may concern:

Be it known that I, Vernon T. BARKLEY, a citizen of the United States, and resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Car Dumps; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to automatic car dumping apparatus, particularly intended for dumping coal cars.

The general object of my invention is to provide a car dump of simple and rugged construction which shall operate automatically to receive one or more loaded cars and to clamp the car in position on the dump,

and which shall then operate automatically to rotate by gravity to empty the car, and shall then return by gravity rotation to its upright position where the car is automatically unlocked from the dump.

Another object of my invention is to provide a car dump in which the wheels of the car shall not be subjected to any shock or strain, either when the car is stopped upon the dump or while the car is being inverted.

The car dump herein shown is related to that described and claimed in my copending application for Letters Patent, which issued on Nov. 11, 1924-, as Patent No. 1,515,326, in that it includes a dump frame mounted loosely on a stationary horizontal shaft and carrying a set of tracks which are so placed the dump is provided with an automatic lock which holds the dump in its upright position until a car runs on the dump and depresses a trigger, whereupon the lock is withdrawn and the dump is free to rotate by gravity.

My present car dump differs mainly from the dump shown in my said prior application in the manner in which the dump is balanced, the means which are employed for clamping the car upon the dump, and the means for returning the dump to its upright position after the car is emptied. in my present invention the car is attached to the dump by means of pivoted clamps or hooks which engage either the wheels, the side sills or the top rails of the car, depending on the construction of the car, and are not thrown into operation until the dump begins to rotate, whereupon stationary cams carried by Serial No. 551,158.

the stationary shaft quickly force the clamping arms into clamping position.

The means for returning the dump to its upright position consists, in the present case, of a movable weight suspended from circularly curved hangers beneath the dump in such a way that the weight ofiers no resistance to the dumping movement, but is picked up by the rotating dump and acts as a brake during the latter part of the dumping movement. After the dumping movement the weight is in position to restore the dump by gravity to its upright position. The movable wei ht is also arranged to stop the rotation of the dump when the dump returns fully to its upright position. The dump therefore operates by gravity in both directions, first to empty the loaded car and then to return the dump to its upright position, and the movable counterweight operates to start the rotation of the dump in the return direction and to check the rotation of the dump both at the end of the dumping move ment and at the end of the returning movement.

The dump is so constructed that when an empty car is placed on the dump and the rolling counterweight is omitted, the center of gravity of the entire revolving system is a short distance vertically above the center of rotation of the system, that is, a short distanceabove the axis of the stationary shaft. This balance is produced by means of an adjustable counterweight. The center line of the car, however, is at one side of the center line of the dump, so that when a loaded car is placed on the dump, the weight of the load imbalances the revolving system and, assistedby the movable counterweight, tends to rotate the dump to its dumping position.

Other objects and advantages of my invention will appear as the description proceeds. p

In the accompanying drawings, l is a plan view of the dump with a portion of the floor plate broken away to show the operating mechanism; Fig. 2 is a longitudinal central vertical section tl rough the dump; Fig. 3 is an end elevational view taken from the left of Figs. 1 and 2; r. 4 is an end elevational view similar to F1 g. 8 showing a modified form of hooks for clamping the car to the dump; Fig. 5 is another end view similar to Fig. 3 showing the dump in its inverted position; Fig. 6 is an end view, partly in elevation'and partly in section, of the buffer stop, the section being 3 taken on the line 6 -6, Fig. 1; Fig. .7. is a detail View, partly in elevation and partly insection on the line 7-7, Fig. 1, showing the means for manually shifting the operating trigger into and out of operating position; Fig. 8 is an enlarged detail view showing the construction of the car clamping hooks shown in Fig. 3; Fig. 9 is an enlarged View of the trigger mechanism, partly in elevation and partly in sectionon the line '9-9, Fig. 1; Fig. 10 is an end view of a dump having clamping hooks of modified construction; and Fig. 11 isan enlarged detail view of a portion of the hook mechanism shown in Fig. 10.

In the drawings, the numeral 2 indicates a stationary shaft which is mounted in bearings 3 carried by fixed supports 4. The frame of the dump is loosely mounted on the shaft 2 by means of hearings or hangers 5, and consists of side channels 6 and end channels 7 framed together at the corners, and strengthened by means of. intermediate channels 8. A cover plate 9 extends oven. the whole frame, with suitable openings for the operating mechanism, and tracks 10 are laid upon the cover plate 9 in line with stationary tracks 11 on which the cars 12 are brought to and removed from the dump. As shown in Figs. 3, 4 and 10, the tracks 10 are unevenly spaced from the stationary shaft 2 for the purpose of unbalancing the dump when it carries a loaded car and causing the dump to rotate by gravity to dump the car.

Extending downward from the intermediate channels 8 of the frame are two vertical braces 15 which join with diagonal braces 16, as shown in Fig. 2, to support two semicircular angle irons 17, the upper ends of which are attached to the transverse channels 8 and to the side channels 6. The angle. bars 17 form tracks on which run the wheels 18.0f a floating weight carriage consisting of a channel support 19 suspended by means of stirrups 20 from a shaft 21 which carries the wheels 18. lVeights 22 are placed in the support 19. It will be Seen that when the dump rotates from its upright position to the inverted position shown in Fig. 5 the weight construction just described will roll on the tracks 17 and will remain stationary in its lowest position untilthe side channels 6 of the frame strike the .stirrups 20, where upon the entire weight construction is lifted to the position shown in Fig. 5. While being thus lifted, the weight operates as a brake to check the rotation of the dump, and when the rotation stops and the car is emp tied the weight then operates to restore the dump to its upright position by giving the dump a quick downward movement which is .sufiicient to bring the dump upright.

and the leading car is stopped in proper po- A permanent counterweight is adjustably secured between the tracks 17 on the side of the dump opposite to that on which the roll ing counterweight operates. This is adjusted to give the dump its proper balance, as stated above, and consists of an angle bar 23 in which weights 24 are placed.

- One or more loaded cars 12 are run upon. the dump from the left of Figs. 1 and 2,

sition on the dump by means of a buffer 25 which is loosely mounted on the stationary shaft 2 and which is hollowed out to receive a spring 26 which cushions the shock of engagement between the car and the buffer. It will beobserved that the buffer 25 engages the body of the car and not the wheels or axles as in prior car dumps. Buffers which act upon the wheels or axles of the cars frequently cause the axles of heavy cars to spring or break.

. One end of a spring 27 is attached to a projection 28 from the barrel 29 of the buffer 25, while the other end of the spring 27 is attached to an adjustable eye-bolt 30. The spring 27 thus tends to hold the buffer 25 in. its upright or operative position.

The buffer 25 is rotated on the shaft 2 to release each empty car and then snaps back into its upright position in time to stop the next loaded car. These movements are pro duced and controlled by means of a horizontal pin 31 which is slidably mounted in a hanger 32 carried by the shaft 2 and is adapted to move into and out of the path of a projection 33 which extends down from the barrel 2901? the buffer, as shown in Figs. 2 and 6. A spring 34 surrounds the pin 31 and is compressed againsta collar 35 so as to tend to force the pin toward the projection 33. The pin 31 is provided with a head 36 adjacent to which is a projection 37 carried by a shifting rod 38 which slides in fixed bearings 39 secured to the dump frame. A link '40 is pivotally attached at 41 to the 110 shifting rod 38 and is also pivotally connected at 42 to a lever 43 which is rigidly carried by a horizontal shaft 44 that also carries a trigger 45 which, when a loaded car runs on the dump, extends into a recess 115 46 in one of the tracks 10, so as to be depressed by one of the front wheels of the car. When the trigger 45 is thus depressed, it rocks the shaft 44 which, through the connections just described, pulls the pin 31 120 from the projection 33 and permits the 7 spring 37 to snap the buffer 25 from the dotted-lineinclined position shown in Fig. 6 to the upright position where it is ready to stop the movement of the car 12.

. \Vhen the dump begins to rotate, the trigger 45 is withdrawn laterally from beneath the car wheel by mechanism to be described below, and when the trigger is so released the spring 34 is free .to return the pin 31 1311' into the path of the projection 33 which by this time has rocked beyond the pin 31. When the dump rocks back to its upright position the pin 31 is engaged by the projection 33 and holds the buffer 25 against further movement toward its upright position, s that when the dump is again upright the horn is still in the inclined position shown in dotted lines in Fig. 6, and therefore offers no obstruction to the empty car which leaves the dump and is replaced by a loaded car, a wheel of which again depresses the trigger and causes the buffer 25 to snap up to its operative position in time to stop the loaded car.

When the dump is in its upright position it is held. against rocking movement by means of two latches which are similar to the latches described and claimed in my said patent, and which consist of locking pins surrounded by springs 51 which are con fined between fixed bearings and collars 53 carried by the pins 50, as shown in 1. The springs 51 tend to force the pins 50 outward into engagement with latches 54 which are carried by the stationary supports 4 and are so constructed, as shown in my said patent, that when the dump rotates from its dumping position toits upright position the pins 50 are received between two jaws 55 which open to allow the pins 50 to pass and then close by spring pressure above the 1 For the purpose of withdrawing the pins 50 from the latches 54, links 56 are pivotally connected to the pins 50 and to the upper and lower ends of a lever 57 which is carried by the shaft 44 which also carries the trigger 45. The shaft 44 also carries a collar 58 and a spring 59 is compressed be-' tween the collar 58 and a washer 60 which rests against one of the side channels 6 of the frame. When the trigger 45 is depressed and rocks the shaft 44 the lever 57 is likewise rocked and withdraws the pins 50 from the latches 54, thus releasing the dump and permitting it to rotate by gravity.

The operation of the latches and the looking pins thus far described is similar to those of the latch devices shown in my said patent. The present device differs from my prior locking device in that, after the dump starts to rotate, the pins 50 are again allowed to snap out into their operative position. in order to engage other bufling and locking devices which may be employed to hold the dump in its inverted position when it is desired to hold a car inverted for cleaning, or to hold the dump inverted for repairs or for any other purpose. In order to so release the pins 50 and permit them to again snap out, the trigger 45 is withdrawn from beneath the car wheel during the rotation of the dump. This is accomplished by means of one of the two stationary cams 61 which are carried by the stationary shaft 2 and serve to operate the carclamping hooks. The cams 61 operate through rollers 62 to rock levers 63 which are secured to opposite ends ofa horizontal shaft 64 which carries an intermediate lever 65. The lever 65 has an arcuate slot 66 in which is received a pin 67 carried by one end of a curved link 68, the other end of which is pivotally secured at 69 to a lug 70 carried by a collar 71 which loosely surrounds the shaft 44 between fixed collars 72 and 7 3.

When the dump begins to rotate the roller 62 rides up on the cam 61, thereby rocking the levers 63, the shaft 64 and the lever 65. This rocking movement of the lever 65 op crates through the link 68 and the collar 61' to move the shaft 44 to the left, in opposition to the spring 59, until the trigger 45 is released from the car wheel, whereupon the springs 51 are free to force the pins 50 out into their operative position. This takes place just after the dump begins to rotate, and when the dump reaches its inverted position, as shown in Fig. 5, one or both of the pins 50 may be received in bufling and locking devices shown in Figs. 1, 3 and 5, each of which consists of a tubular casing 75 containing a compression spring 76 upon which is supported a plate 7 7 which extends through openings in the casing 75 beneath stop projections 78. A latch 79 having a tapered head 80 extends through bearings 81 above the casing 75 and is surrounded by a spring 82 which tends to force the head 80 into locking position above the plate 77.

When one of the pins 50 is brought by the rotary movementof the dump to the position shown in Fig. 5 it moves downward upon the head 80 of the latch 79, pushes the latch aside and is yieldingly stopped by the plate 77, whereupon the plate 72 snaps the latch 79 above the pin 51 and holds this pin in position, as shown in Fig. 5, until the latch 79 is withdrawn by means of a hand lever 83 which is adjustably connected to the latch 79, whereupon the dump is free to be brought back to its starting position by the rolling weight device described above.

lVhen it is desired to hold the latch 79 out of operation, which is usually the case, the hand lever 83 is withdrawn to the dotted line position shown in Fig. 5 and a pivoted stop member 83 is swung over from the full line position to the dotted line position shown in Fig. 5, where it prevents the hand lever and latch from returning to the full line position. As thus arranged the plate 77 operates as a yielding stop for the dump in its inverted position, but the dump is not locked in this inverted position until the stop member 84 is again removed.

The latch construction just described may be duplicated at the opposite side of the dump, and such additional latch may be used to operate the dump'by handerelease, thereby dispensing with the automatic looking and releasing mechanism.

. As soon as the dump begins to rotate by gravity the car is gripped by means of clamping hooks'which may be of-several different constructions, depending on the construction of the cars that are to be dumped. All of these hooks are designed to support most of the weight of the car while the car is being inverted, thereby relieving the flanges of the car wheels from the strain of supporting the car during the dumping movement. Three of these different hook constructions are shown in the drawings. Figs. 1, 3, and 8 show a construction in which four pivoted hooks 85 grip the side channels 86 of a fiat-bottom car, while Figs. 4 and 5 show a modified construction in which hooks 85 grip the wheels of a car of the gun'wale type. Fig. 10 shows a still further modification in which the hooks indicated at 85 engage over the upper rails of the car. In all of these forms the clamping hooks 85, 85 or 85 do not come into operation until the dump begins to rock and then are. caused to grip the car or the car wheels. The hooks hold the car on the dump while the dump is rocking and are released just before the dump returns to its upright position.

The manner in which the hooks 85 are connected and operated is best shown in Figs. 3 and 8. Each of the hooks 85 is mounted on a pivot 86 and has a downward extension 87 to which is connected one end of a rod 88, the other end of which is pivotally connected to one of the levers 63 which, as stated above, carries a cam roller 62 running upon one of the stationary cams 61 carried by the stationary shaft 2. Heavy springs 89 surround the rods 88 and are confined between spring seats 90 that are adjustable on the rods 88 by means of nuts 91. The function of the springs 89 is to provide for adjustment of the hooks 85 and also to cushion the pressure with which the hooks 85 on the descending side of the car support the weight of the car. Springs 92 similar to the springs 89, but of less strength, surround the rods 88 which connect the levers 63 with the hooks 85 on the left of the dump, as shown in Fig. 3. do not support the weight of the car the springs 92 need not be as strong. as the springs 89. a r v A spring 93 is connected to the lower end of each of the levers 63 and has itsopposite end connected to an adjustable eyebolt 94. The springs 93 keep the rollers 62 in contact with the cams 61 and also open the hooks when the dump rocks back to its up Since these hooks the form described above, the lower ends of the hooks 85? are pivoted directly to links 95 which are also pivoted directly to the levers 63. The springs 93 withdraw the hooks from the wheels when the dump returns to its upright position, and the hooks are closed to grip the wheels just after the dump begins to rotate.

Fig. .10 shows another modified form in which the clamping hooks may be constructed. As shown in this figure, the hooks 85 slide vertically inbearings 96 carried by brackets 97 which are supported on the cover plate 9 of the frame and are provided with braces 98. The lowerend of each of the four hooks 85 is pivotally connected at 99 to a link 100, the lower end of which is pivotally connected at 101 to a combined lever and ratchet plate 102 which is pivoted on a horizontal shaft 103. The combined lever and ratchet plates 102 are provided with teeth 104 which are engaged by pawls 105 mounted on pivots 106 and pressed toward the teeth 104 by means of springs 107. Each of the members 102 has a downwardly extending forked projection 108 which is connected by means of pins 109 to a collar 110 surrounding a sleeve 111 which is screwed upon a horizontal rod 112., A spring 113 surrounds the rod 112' and is compressed between the adjustable collar 110 and a fixed collar 114. The rod 112 also carries adjustably two strikers115 which, when the rod is reciprocated, engage the projections 116 of the pawls 105 to move the pawls into and out of contact with the teeth 104.

Cams 61 on the stationary shaft 2 operate the two horizontal rods 112 to raise and lower the horns 85 andfor this purpose are connected to the rod 112 through the cam roller 117 and a lever 118 which is pivoted at 119 and is connected at its lower end to the rod 112.

' Adjacent to the hooks 85 at the right side of Fig. 10, that is to say, on the descending side of the dump, additional means are pro vided for sustaining the weight of the cal consisting of shoes 120 which are pivoted at 121 to brackets 122 and are pivotally attached at 123 to connecting rods 124 which, like the connecting rods 100, are attached to the combined levers and ratchet plates 102 on this side of the dump..,

In the operation of the car holding mech- Cir anism shown in Fig. 10, the parts are in the positions shown in full lines on Fig. 10 when the loaded car runs upon the dump. Then the dump starts to rotate the cam 61 operates through the lever 118 to shift the rod 112 to the left, thereby rocking the plates 102 on their pivots 103 and drawing down the connecting rods 100 and with them the hooks 85 which engage the upper rails of the car. At the same time the strikers 115 which have been holding the pawls 105 out of contact with the teeth 104 move to the left and release the pawls which are forced by the springs 107 into engagement with the teeth 104, thereby preventing the members 102 from turning backward to release the hooks 85 as long as the pawls 105 engage the ratchet teeth, At the same time the shoes 120 are rocked by their pivots 121 into engagement with the side of the car and support most of the weight of the car while it is being rocked to dumping position and raised again to its upright position. When the dump has emptied the car and again approaches its upright position, the cam rollers 117 run ofi the cams 61 and enter recesses 125 in the cams 61 which act as stops for the rollers 117 and rock the levers 118 around their pivots 119 to shift the rods 112 to the right in Fig. 10. The shoes 120 take up side thrust and keep wheel flanges from pressing on the track. This movement of the rods 112 brings the strikers 115 against the projections 116 of the pawls 105, thereby releasing the pa-wls from the ratchet teeth 104. The continued movement of the rod 112 rocks the members 102 around their pivots 103, thereby raising the hooks 85 and the shoes 120, and leaving the car 12 ready to run off the dump.

In order to lock the latch pins 50 in their locking position, and to prevent them from being withdrawn until a car properly rolls upon the dump, I provide a locking pin 133 operated by an auxiliary trigger 126 which, as shown on Fig. 1, extends into a recess 127 in one of the tracks 10 a short distance behind the recess 46 which receives the trig ger 45. The auxiliary trigger 126 is mounted on a shaft 127 to which is also secured a double lever, one arm 128 of which carries a small weight 129 which tends to hold the trigger 126 in its upright position. The other arm 130 of the double lever is connected by means of a pin-and-slot connection to a link 131, the forward end of which is pivoted at 132 to the locking pin 133 which, in its forward position, extends behind the collar 73 which, as stated above, is carried by the shaft 44 which also carries the unlocking trigger 45.

As the car 12 runs upon the dump from the left of Fig. 2, one of its front wheels depresses the auxiliary trigger 126 which rocks the shaft 127 and, through the lever 130 and the link 131, withdraws the pin 133 from behind the collar 73, permitting the spring to move the shaft 44 to bring the trigger 45 into position where it can be depressed by the car wheel.

In order to throw the unlocking mechanism out of operation to enable cars to be run across the dump without rocking the dump, as when empty cars are to be shifted, or when rock cars are to be brought out of the mine, I provide a hand lever 135 which, as shown on Figs. 1 and 7, consists of a bent pipe 136 which carries a lever 137, the lower end of which is pivoted to one end of a connecting link 138, the other end of which is pivoted to a collar 139 secured to the shaft 127 which carries the trigger 126. lVhen the lever 135 is moved to turn the rod 136, the shaft 127 with the trigger 126 is drawn out of the path of movement of the car wheels, and the pin 133 holds the trigger 45 out of the path of the car wheels, so that cars may run acrossthe dump without depressing either of the trig.- gers and therefore without unlocking the dump.

In order to prevent the coal from falling out of the car 12 before the dump is in vertcd, a curved apron 140 extends down below the level of the dump and holds the coal in the car until the dump reaches the position shown in Fig. 5.

At the beginning of each car-dumping operation, the dump is in its upright position with the locking pins 50 engaged in the latches 54, the rear trigger 126 is raised and in position to be engaged by one of the car wheels, the front trigger is held away from the track by the locking pin 133, and the buffer 25 is in its inclined position shown in dotted lines on Fig. 6. A loaded car runs upon the dump from the left of Figs. 1 and 2. The front wheel on the left side of the car first depresses the auxiliary trigger 126, thereby withdrawing the locking pin 133 from behind the collar 73 and permitting the spring 59 to move the shaft 44 to the right, Fig. 10 to bring the trigger 45 into its recess 46 in the car track. The front wheel of the car next depresses the trigger 45. When the trigger 45 is thus depressed its first action is to release the pin 31 from the projection 33 of the buffer 25, which permits the buffer to snap up into its vertical position, where itengages and stops the car. Meanwhile, the further depression of the trigger 45 withdraws the latch pins 50 from the latches 54 and the dump, being unbalanced on the right, as shown on Fig. 3, immediately be ins to rock in a clockwise direction, as seen in this figure.

As soon as the dump begins to rotate the cams 61 operate through the lever. 63 to close the

hooks

85, 85 or 85 and these'horns clamp the car to the dump and support, a

considerable portion of its weight during the dumping operation. At the same time, the cams 61 operate through shaft 64 and the

levers

65 and 68 to shift th shaft 44: and withdraw the trigger 15 from beneath the car wheel, whereupon the springs 51 force the locking pins out into their looking position and the pin 133 snaps behind the collar 73 on the shaftv 14 and locks the pins 51 in their locking position.

As the dump revolves, the weight carriage 18-21 rolls upon the track 17 without interfering in any way with the rotation of the dump until the dump has made about one-fourth of a complete rotation, when the dump frame engages the frame of the weight and carries the weight along with it to the position shown in Fig. 5. While thus being carried, the weight checks the speed of rotation of the dump and is so proportioned that when the pins 51 strike the buffer plate 77 of the latch shown in Fig. 5, the dump has nearly ceased to rotate, so that but little shock is produced at this tin1e.flTl1e coal in the car is kept from falling out by the apron 140 until the car is nearly inverted,

and then falls into the hopper, or other suitable receiving apparatus.

If the latch 7 9 is in operation, the dump is held in its inverted position, as shown in F ig. 5, until the latch is released by the hand lever 83. Usually, however, this latch is not operated and the dump is free to return to its upright position as soon as the coal has been emptied. In this inverted'position the dump is unbalanced by means of the rolling weight, so that its center of gravity is on the left side of the stationary shaft 2, and the dump with the empty car therefore rocks by gravity in a counterclockwise direction. When the rolling weight reaches its lowest position it remains there and the dump continues to rotate by: its inertia of movement, assisted by the fixed weights 24. Y

VJ hen the dump approaches the end of its backward movement the cam rollers 62 ride off from the raised portions of the cams 61' and the springs 93 open the hooks and release the car. Immediately thereafter the atch pins 50 strike down upon the latches 54: which snap into place and hold the dump against rotation in either direction.

. The horn 25 is engaged by the pin 31 during the return movement of the dump and is held aside in its dottedeline position in Fig. 6 through the mechanism described above. Therefore, when the dumpreaches its upright position the car 12 is free to roll from the dump and it is usually pushed ahead by the next loaded car which comes upon the dump. The left front wheel of this loaded car depresses the trigger 126 and the whole cycle of operations is then automaticallv repeated.

The car dump herein shown and described has the advantage of being entirely autopermits the use of an automatic gravity dump where great dumping. capacity is unnecessary, and where therefore a. single-car dump is sufficient. i

It is recognized that various changes in the construction and arrangement of parts may be made without .departing from my invention, the scope of which is set forth in the appended claims.

I claim as my invention:

1. Car-dumping apparatus comprising a support rotatably movable by gravity, car tracks carried by said support and unsymmetrical with respect to axis of rotation of said support, means for locking said support in car-receiving position, means forreleasing said locking means, meansoperable after the release of said locking means for engaging said car to holdit upon said support, and automatically operable gravity actuated means for rocking said support from its car-dumping position back to its car receiving position.

2. Car-dumping apparatus comprising a rotatably movable support, means for securing a loaded car to said support in such position that its center of gravity is to one side of the axis of the support, to permit move ment to car dumping position, and means for. thereupon returning the said support to its upright position, the said means being operable through only a portion of the return movement of said support. 7

3. Car-dumping apparatus comprising a rotatably movable member, car tracks carried by said member andunsymmetrical with respect to the axis of rotation of said member, means for locking said member in car receiving position, automatically operable means for releasing said locking means, means for securing the car upon said tracks. and gravity actuated means for rocking said member'from its car-dumping position back to its car-receiving position, the said gravity means being operable through only a portion of the movement to car receiving position.

4:. Car-dumping apparatus comprising a stationary shaft, a frame mounted loosely on said shaft, tracks carried by said frame and unbalanced with respect to said shaft,

means for locking said frame in car-receiv- 1ng position, means automatically operable by the movement of a car for releasing said locking means, and means automaticallv operable by movement of the said frame foisecuring the car in position on said frame.

5. Car-dumping apparatus comprising a stationary shaft, a frame mounted loosely Inn 011 said shaft, tracks carried by said frame and unsymmetrical with respect tosaid shaft, means for locking said frame in car receiving position, means for releasing said locking means, means automatically operable by movement of said frame for securing the car in position on said frame, and gravity-actuated means for returning said frame from car-dumping position back to car-receiving position.

6. Car-dumping apparatus comprising a stationary shaft, a frame mounted loosely on said shafts, tracks carried by said frame and unbalanced with respect to said shaft, means for locking said frame in car-receiving position, means automatically operable by the movement of a car for releasing said locking means, means automatically operable by movement of the said frame for securing the car in position on said frame, and gravity actuated means for returning said frame from car-dumping position back to car-receiving position.

7. Car-dumping apparatus comprising a rotatably movable member adapted to rotate by gravity from car-receiving position to car dumping position, and a weight mounted movably on said member and adapted to return said member from cardumping position to car-receiving position.

8. Car-dumping apparatus comprising a rotatably movable frame, means for securing a loaded car thereto in such position that the center of gravity of the dump and car are unbalanced with respect to the axis of rotation of the dump, circularly curved tracks depending from said member and a movable weight mounted on said tracks.

9. Car-dumping apparatus comprising a frame, means for securing loaded car to said frame in such a position that the frame and car are unbalanced with respect to the axis of rotation of said frame, two spaced and circularly curved tracks s cured beneath said frame, a carriage having wheels running on the said tracks, and a weight carried by said carriage.

10. Car dumping apparatus comprising a frame, tracks carried thereby, a stop disposed between said tracks in position to engage and stop a car, and means actuated automatically by movement of said frame for removing said stop from the path of said car and permitting the car to leave the dump.

11. Car-dumping apparatus comprising a stationary shaft, a frame loosely mounted on said shaft, car tracks carried by said frame, a stop member carried by said shaft, a spring tending to hold said stop in position to stop a car running on said tracks and a pin operable through rotation of said frame for rocking said stop member out of its operative position. i

12. Car-dumping apparatus comprising a stationary shaft. 2. frame loosely mounted on said shaft, car tracks carried by said frame, a stop member carried by said shaft, a spring tending to hold said stop member in upright position, a pin carried by said frame and adapted to engage a portion of said stop member to rock said stop member away from its upright position, and a trigger disposed adjacent to one of said car tracks and connected to withdraw said pin from said stop member.

13. Car-dumping apparatus comprising a stationary shaft, a frame. loosely mounted on said shaft, car tracks carried by said frame, means for securing a car in position on said tracks, latch pins carried by said frame, latches for engaging said pins to hold said frame in car-receiving position, automatically operable means for withdrawing said pins from said latches when a car runs upon said frame and for thereafter advanc ing said pins, and other latches for engaging said pins and holding said frame in cardumping position.

14. Car-dumping apparatus comprising a rotatably movable frame, car tracks carried by said frame, locking members also'carried by said frame for holding said frame in upright car-receiving position, a trigger operable by one of the wheels of the car for withdrawing said locking members and permitting said trigger to rotate, a lock connected to hold said trigger out of the path of the car wheels, and a second trigger disposed adjacent to one of said tracks behind said first-named trigger and connected to withdraw said lock when depressed by a car wheel, thereby permitthw said first-named trigger to move into the path of said car wheel.

15. Car-dumping apparatus comprising a rotatably movable frame, car tracks carried by said frame, locking members also carried by said frame for holding said frame in upright car-receiving position, a trigger oper able by one of the wheels of the car for withdrawing said locking members and permitting said trigger to rotate a lock connected to hold said trigger out of the path of the car wheels, a second trigger disposed adjacent to one of said tracks behind said firstnamed trigger and connected to withdraw said lock when depressed by a car wheel, thereby permitting said first-named trigger to move into the path of said car wheel, and manually operable means for moving said second trigger out of the path of the car wheels, whereby cars may move across said dump without depressing either of said triggers and therefore without unlocking the dump.

16. Car-dumping apparatus comprising a rotatably movable frame, means carried by said frame for securing cars thereto, andv a movable weight suspended beneath said frame, the said frame being so constructed that when an empty car is placed thereon and the said movable weight is omitted, the center of gravity is vertically in line with the axis of rotation of said frame.

17. Car-dumping apparatus comprising a frame mounted for oscillation to dump a car and then to return to upright position, a curved track suspended beneath said frame, and a movable weight adapted to move on said track, the said weight being mounted to check the dumping movement of said frame, then to give said frame an impulse in the return direction and thereafter to check the returning movement of said frame.

18. Car-dumping apparatus comprising a stationary shaft, a frame loosely mounted on said shaft, tracks carried by said frame, one on each side of said shaft and in substantially the same plane as said shaft, and car latching mechanism having engagement with said shaft and said frame so as to operate upon relative movement thereof.

19. Car-dumping apparatus comprising a frame adapted when released to rock from upright position to car dumping position, means carried by said frame for securing cars thereto, tracks on which the said cars run upon said frame, meansfor locking said frame in upright car receiving position, a trigger disposed adjacent to one said tracks and adapted when depressed to release said locking means, means for withdrawing said trigger from said track and for locking said trigger in its withdrawn po- 'sition, and a second trigger disposed adjacent to said track and adapted when depressed to release said trigger-locking means and to permit said trigger to move into posi tion adjacent to said track.

20. Car-dumping apparatus comprising a frame adapted when released to rock from upright position to car-dumping position, means carried by said frame for securing cars thereto, tracks on which the said cars run upon said frame, means for locking said frame in upright car-receiving position, a.

trigger disposed adjacent to one of said tracks and adapted when depressed to release said locking means, a spring tending to hold said trigger in position adjacent to said track, means actuated by the movement of said frame for withdrawing said trigger from said track, a spring-pressed lock for holding said trigger in its withdrawn position, and a second trigger disposed adjacent to said track and adapted when depressed to withdraw said locking pin and permit said spring to return said first-named trigger to position adjacent said track.

21. Car-dumping apparatus comprising a frame rotatable by gravity from car-receiving position to dumping position, pins for locking said frame in upright position, can

operated means for withdrawing said pins and releasing said'frame, means for thereafter releasing said pins and permitting them to move into operative position, and a buffer adapted to engage said pins and stop the rotation of the said frame in its dumping position. I

22. Car-dumping apparatus comprising a frame rotatable by gravity from car-receiving position to dumping position, hooks carried by said frame and adapted to automatically engage and support the car during the dumping movement of said frame, and springs associated with 'said'hooks and forming a resilient supporting connection between said hooks and said frame.

23. Car-dumping apparatus comprising a frame rotatable by gravity from car-receiving position to dumping position, hooks carried by said frame and adapted to engage and support the car during the dumping movement of said frame, springs associated with said hooks and forming a resilient supporting connection between said hooks and said frame, and means operable automatically in response to movement of the said frame for causing said hooks to engage said car and for thereafter releasing said hooks from said car. i

24. Car-dumping apparatus comprising a frame rotatable by gravity from car-receiving position to dumping position, hooks carried by said frame and adapted to engage and support the car during the dumping movement of said frame, springs associated with said hooks and forming a resilient supporting connection between said hooks and said frame, and means automatically responsive to the movement of said frame from carreceiving position to dumping position, for causing said hooks to .engage said car for thereafter releasing said hooks from said car when said frame again approaches its upright position.

25. Car-dumping apparatus comprising a shaft, a rotatably movable frame mounted on said shaft, car tracks carried by said frame, a stop member carried by said shaft, a spring tending to hold said stop member in position to stop a car running on said tracks, and a member operable through rotation of said frame for rocking said stop member out of its operative position.

26. Car-dumping apparatus comprising a rotatably movable frame mounted on said shaft, car tracks carried by said frame, a car-stopping member carried by said shaft and rotatably movable around the axis of Said shaft, and a spring associated with said stop member for cushioning the engagen'ient of cars with said stop member.

In testimony whereof, I the said VEnNor. T. BARKLEY have hereunto set my hand.

VERNOR r. BARKLEY.