US1768848A - Rotary car dumper - Google Patents

Description

July 1, 1930. y E. H. KIDDER 1,768,848

ROTARY CAR DUMPER Filed 1356.9. 1927 4 sheets-sneer 1 July 1, 1930. I E. H. KIDDER 1,768,848

ROTARY CAR BUMPER Filed Dec. 9, 1927 4 Sheets-Sheet 2 Qq Q W@ @Uefa for July 1, 1930.

E. H. KIDDER ROTARY CAR BUMPER 4 Sheets-Sheet 3 Filed DSC. 9, 1927 July 1, 1930.

E. H. KIDDER ROTARY CAR DUMPER Filed Dec. 9. 1927 4 Sheets-Sheet 4 CLD Patented July l, 1930 stares Medea@ rarest ersten ELWIN E. KIDDER, OF CHICAGO, ILLINOIS, ASSIGNOR TO -LI1\TKBEIUI. COMPANY, 0F CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS ROTARY CAR BUMPER Application led December 9, 1927. Serial No. 238,819.

My invention relates to improvements in rotary car dumpers and has for one object to provide a new and improved form -of car dumper wherein by the use of a counterweight and lever the car may be clamped in position on the cradle and wherein the force exerted by the clamping means is adjustable to support the heaviest load that can be brought upon the mechanism without at the same time exerting a pressure sufiicient to damage the lightest and iiimsiest type of car. Another objectis to provide a clamp holding mechanism. Another object is to provide a clamping mechanism where the counterweights supporting the load are located entirely off the cradle. Other objects will appear from time to time in the course of the spe iiication and claims.

1fly invention is illustrated more or less diagrammatically in the accompanying drawings, wherein- Figure l is a transverse section;

Figure 2 is a section along the line 2 2 of Figure l;

Figure 3 is a section in the same plane as Figure l showing the car in the dumping position;

Figure 4 is a detail view;

Figure 5 is a section along the line 5-5 of Figure A;

Figure 6 is a section along the line 6-6 of Figure 4;

igure 7 is a section along the line 7-7 of Figure 2.

Like parts are indicated by like characters throughout the specification and drawings.

A is a foundation structure preferably of concrete and the like containing a receiving hopper A1 with room inside the foundation beneath the receiving hopper for material handling apparatus which since it forms no part of my present yinvention is not here shown or illustrated. A2 is a framework supported within the foundation and overlying the hopper. Mounted on this framework and upon the hopper are supporting blocks A3 A3 upon which are pivoted equalizing beams A4 A5, with rollers A3, one on each end of the equalizing beams. A7 A7 are roller rings one supported von the rollers AG y A6 at each end of the structure. A30 is a structural steel cradle mounted on and supported vby the roller rings A7. This cradle is generally U-shaped in cross section, being built up by structural shapes as indicated and the cradle with the roller ring is supported and free to rotate on the rollers A6. A3 is a transfer table extending longitudinally of the cradle from end to end. This transfer table carries car tracks A9 adapted when the cradle is in the upright position to be in line with the fixed car tracks A10 on the foundation. This transfer table is supported on rollers A11 adapted to travel on transverse tracks A12 on the cradle so that the transfer table may move to one side to permit the car A13 on the tracks on the transfer table to move laterally toward the left from the posit-ion shown in Figure l as the cradle rotates to bring the side of the car into engagement with the cushion A14. The engagement of the car with the cushion is shown in Figure 3.

Spaced along one side of the U-shaped cradle are a series of vertical guideways or stanchions B. Traveling along each of these guideways or stanchions is a clamp carriage B1, the clamp carriage being providedwith track engaging elements B1 whereby the carriage is free to travel along the guideway but held against rotation with respectthereto. This clamp carriage has a lug B3 overhanging the top of the car A13, the arrangement being such that when the clamp is in the down position thisl lug engages the' top of the car A13 as shown in Figure 3. Fivoted on this lug` is a clamp beam B4 having a car engaging face B5 which when the car is in the dumping position, engages the top ot' the caras shown in Figure 3. It will be noted that the car engaging face B5 is relatively short whereas the car engaging lug B3 is quite long, the reason for this being that the cars are of diflerent widths and since the side of the car always engages the cushion the lug B3 to be widely extended to engage the car no matter where it comes. B6 is a Cil stop interposed between the clamp B4 and the lug Ba whereby the angular rotation of the clamp arm W1th respect to the lug is limited. It will be noted that in the inoperative position, t-he surface B5 extends down below the car engaging surface of the lug B' so that this surface comes into engagement with the car first and as the carriage continues to descend the clamp beam rotates with res ect to the carriage unt-i1 both the surfaces 5 and B are in engagement with the car.

Referring now to the means for raising or holding the clamp in the raised position above the car, attention is drawn irst to Figure`7. C is acurved track on one of the track rollers. In this track travels a carriage C1. This carriage has an arm C2 adapted to ena sto C on the equalizing beam A5. A el! le C 1s dead ended on the carriage C1 which carriage it will be noted is free to travel along the track C. This cable extends around afsheave C5 on the roller ring back around a sheave C thence up around a sheave C7. It willbe noted that there is one of these lifting carriages on each of the roller rings and the cable C* between the sheave C and the twosheavesC7 is divided and one branch of the cable oes over each of the sheaves C7 but over a guide sheave C8, thence over a sheave C at the'top of the stanchions B and thence downwhere each of these cable parts is dead ended on'a link C, which link is concentric with the pivot axis of the clamp arm B* on the carria B1. When the parts are in the position s own in Figure 7, the lifting carriagevisA drawn away from the sheave C5 by its engagement with the stop Cs and raises the cla-Inps out of engagement with the car. I'f the roller ring rotates in a counterlockwim direction in Figure 7, the tension on the hoisting rope caused by the weight of the elampand carriage will cause the carriage G to remain in engagement with its stop, thus shortenin the distance between the carrig C1 and t e sheave C5 as the roller ring rotates.` This continues until as the cradle mtdies'the clamps have settled down against the car at which time there will be no further tension on the cable C4 and the carriage C1 will remain at rest in its track and travel away from the stop.

Die a brake shaft, there being one for each clamp. On this brake shaft is a brake wheel I)I associated with a brake band D2. Ds is a brake lever fulcrumed adjacent to one end 0i the band' D2 at a oint adjacent the fulcrum. D" is a power ul spring tending normadly to operate the lever and lock the brake drum D* against rotation. D5 is a cam track projecting upwardly from the foundation adjacent to the brake drum D1. D" is a bell crank lever pivoted on the arm D7 on the cradle having a roller D23 adapted to engage the cam track D5. A link D5 extends from the other arm of the bell crank lever to the free arm of the bell crank lever D1", the other arm of which carries a roller D11 adapted to engage thebrakeleverD3 so that when the arts are in the upright inoperative position s own in Figure 4, the cam track D5 through the two bell crank levers and links compress the spring D4 to release the tension on the brake band D2 and permit the brake shaft D to rotate. This condition continues as long as the roller D is in engagement with the cam. As the cradle rotates in a counter clockwise direction referring to Figure 4, toward the dumping position, the time comes when the roller D8 goes out of contact with the cam D. At this time the brake spring is no longer com ressed but is allowed to exert a tension on t e brake band, lock the brake band and brake shaft against rotation, the parts remaining so locked until upon return movement the cradle comes back to the upright position. Y

Mounted on and held against rotation with respect to the brake shaft D are a series of compound diferential pulleys E. El, there being one associated with each stanchion B. Dead ended on the pulley E is a drum rotating or take-up cable E2, which cable travels over a sheave E3 at the lower end of the pillar B thence up over a sheave E4 and around a sheave E5 at the upper end of the pillar and thence down Where it is dead ended on the link C1 to which is dead ended the hoisting cable. E5 is a spring take-up interposed in the cable and forming a part of it, there being thus a separate spring takeup for each of the clamps. E7 is a clamp holding cable. It is dead ended on the larger radius of the com ound pulley E1 and adapted to be wound a out it in a direction opposite to the winding of the take-up cable E. This cable E'I extends across beneath the cradle around the sheave E8 thence u over a sheave E9 at the outboard end of the c ampin g arm, thence over a sheave E10 on the clamp carriage, the axis of rotation of this carriage being the same as the axis of rotation of the clamp and also the same as the axis upon which the link C10 is pivoted. The cable E7 extends down thence over a sheave E51 and then up to the bell crank lever E12 upon which it is dead ended.

The lever E is pivoted on the lug F. It engages a stop F1 which holds it against rotation in a. counter clockwise direction as shown in Figure 1; extending from the free end of this lever is a cable F2 traveling up over a sheave F*l on a counterweight tower F, thence down around a sheave F5 on the counterweight F thence up around a sheave F7 down around a fixed curved guide member Fxs across beneath the cradle around a curved guide member F0 and then it extends to the arm F1o on the cradle where it is dead ended. The arrangement of this is such that the weight of the counterweight F6 tends to rotate the lever in a clockwise direction bringing it into engagement with the stop F1 and when in this position it serves as an abutment against which the cable El may pull, the cable E7 being anchored on the other end on the differential pulley. When, however, with the parts starting in the position shown in Figure l the cradle is rotated toward and into the position shown in Figure 3, as long as the spring brake is held out of engagement, the differential drum is free to rot-ate and as the cradle rotates and as the clamps descend they draw out on the hoisting cable and create a slack in the holding cable but since the take-up cable is drawn out as the hoisting cable is slackened up the take-up cable tends to rotate the diderential pulley and wind inon the holding cable` During this time the free end of the holding lever is moved toward the top on the counterweight tower and the same is true of the part of the cradle on which the other end of the counterweight cable F 2 is dead ended so that the 'counterweight tends to descend. rllhe equalizing spring in the take-up cable compensates for dierence in the contour of the car and since the two sides of the holding cable are shortened more rapidly than the one section of the takeup cable is taken up. There will be a winding up of the holding cable on this part of the differential pulley at a more rapid rate than the unwinding of the take-up cable from its part of the differental pulley. The result of this is that after about thirty degrees travel the clamp will have settled down against the car, the cable will be tight and the brake will be put on. rlhen as the cradle rotates further and as the clamp lever travels away from the counterweightptower the angle through which the cable pulls on the clamp lever will increase, the leverage will increase and the tension of this counterweight cable will tend to rotate the clamp lever awayout of Contact with its abutment thereby increasing the tension on the holding` cable as is shown in Figure 3.

lt will be understood that under ordinary conditions the car begins to dump its con tents long before it reaches the upside down position as shown in Figure 8 and the meehanism under ordinary conditions never has to support the entire weight of the car and its load. If, however, the load should be frezen into the car it might happen that the clamps might have to carry a load made up of the weight of the car and its frozen contents. Under these conditions it sometimes will happen that the weight of the car will overcome the counterweight but if it does, it will only overcome it to bring the clamp lever bacl: against its abutment. Thus under these conditions the counterweight is out of operation and it becomes possible to provide a relatively light counterweight, one sufficient to hold the ordinary loads encountered and at the same time light enough not to crush a light or imsy car. @ne purpose of the counterweight then is to take up additional slack in the cable holding the clamps, and to exert an additional tension on the car to taire care of the occasional situation where a lump of coal or something of that kind is caught between the car and the clamp. lWhen and if the weight of the counterweight is overcome the load is then carried by the cable held between the abutment against which the lever engages and the brake. l

@n the return movement of course the operation is j ust the opposite.

ylhe cradle is rotated by means of a drive shaft `(3f carried in pillow blocks G1 .driven by a motor not here shown. Each end of the drive shaft carries a pulley G2, about which s is wound a rotating cable G3, the cable Abeing dead ended at either. end on spring abutments G4 on the roller rings, the cable being wound about the ring as indicated in Figure l. Rotation of the motor in one direction or the other causes the cradle to rotate in a clockwise or counter clockwise direction as the case may be.

rlhe differential pulley is dierential merely in order to compensate for the fact that as the clamp comes down the cable E7 on both sides of the car is shortened and the cable FF extending from the clamp downwardly is lengthened and means must be provided so that the cable remains always right. This is accomplished in the preferred form by means of the differential pulley. i

Manifestly this spring take-up might be located in the cable or in the link C10 or might take the form of a spring support for the sheaves E3 or E4. It will be noted that this tal-e-up is not located in the load carrying part of the system but merely in that part of the system between the dierential pulley andthe clamp carriage B1. It has nothing to do then with the position of the clamp and y is not affected in any important way by the presence or absence above the car of any foreign matter, lumps of coal or the like which might and frequently do prevent seating of the clamp surfaces B1 and B5 against the car. Any change in operation resulting from presence of or subsequent collapse of such material is talen care of by the cable F2 which transmits the power of the counterweight F S to the lever E12 and rotates the lever away from its abutment F1 to set up an initial tension in the clamp holding cable system.

'lhe spring take-up FG does not function until after point B5 of clamp is seated on the car or on some obstruction. Up to this time the dierential drum acts to wind in cable E7 as fast as it is paid out by lowering of the clamp. rlhe amount paid out is twice the llO movement of the clamp due to the two-part reevin of the nope E7 about the clamp. The cable however has a single part reeving to the carriage and therefore moves only as far as the clamp or half as far as the cable E7. To compensate for this the two diameter derential drum is used. When the clamp seats itself on the car the point B5 strikes first and stops. Carriage B1 moves on down to the top ofthe car rotating the clamp beam about the pivot of sheave E1". During this movement the cable E' is paid out only an amount ual to the movement of carriage B1, instead o acting as a two part line, and paying out twice that amount, as it does during the part of the clamp movement up to the time when B strikes the car. The differential drum, of course, is so proportioned as to wind an amount of holding rope equal to double the movement of clamp carriage B1 and pay out an amount of rope E2 equal to the 'movement of the carriage. Since, however, duringV the last part of the movement carriage B1 only is moving, and point B5 is stationary the two to one ratio of rope movements is changed to a one to one ratio, some means of compensating is necessary or the carriage B1L would be held back by rope E2 prevented from comingr to its seat on the car. At this time spring E6 comes into play by elongang a sufficient amount to make up for the two to one ratio of movements which is created by the different diameters of the dji'erential drum. Spring E6 is to have only sucient carrying capacity to insure rotation of drum E1 to wind in cable E", but should deect easily under the weight of' carriage B1 after point B5 has seated and the weight of clam has been relieved from lifting ropes C4.

I c aim:

1. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable in engagement with the clamp at all positions thereof, a lever upon which one end of the cable is dead ended, means operative only after the clamp is seated on the car for rotating the lever to exert a tension on the clamp holding cable and hold the clamp in working position to support the car 2. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable in engagement with the clamp at all positions thereof, a. lever upon which one end of the cable is dead ended, means operative only after the clamp is seated on the car for rotating the lever to exert a tension on the clamp holding cable and hold the clamp in working position to support the car, and a separate structure upon which said means are in part supported independentof the cradle.

3. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable in engagement with the clam at all positions thereof, a lever upon whic one end of the cable is dead ended, means operative only after the clamp is seated on the car for rotating the lever to exert a tension on the clamp holding cable and hold the clamp in working position to support the car, said means comprising a counter-weight and a tractor upon which the counterweight is mounted independent of the cradle, and a cable interposed between the counterweight and the lever.

4. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable in engagement with the clam at all positions thereof, a lever upon whic one end of the cable is dead ended, means operative only after the clamp is seated on the car for rotating the lever to exert a tension on the clamp holding cable and hold the clamp in Working position to support the car, said means comprising a counterwelght and a tractor upon which the counterweight is mounted independent of the cradle and a cable interposed between the counterweight and the lever, the cable being dead ended on the lever extending over a sheave on the counterweight guide, thence over a sheave on the counterweight, thence back over a second sheave on the counterweight guide to and dead ended on the cradle.

5. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable in engagement with the clamp at all positions thereof, means operative only after the clamp has seated on the car for exerting a tension on the cable to hold the car and clamp in position, and a separate structure upon which said means are in part supported independent of the cradle.

6. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable in engagement with the clamp at all positions thereof, means operative only after the clamp has seated on the car for positively holding one end of the cable against movement and for exerting a tension on the other end of the cable to hold the clamp and car in fixed position with respect to the cradle.

7. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable in engagement with the clamp at all ositions thereof, means operative only a ter the clamp has seated on the car for positively holding one end of the cable against movement and for exerting a tension on the other end of the cable to hold the clamp and car in fixed position with respect to the cradle, the

tension exerting means being removed from the cradle.

8. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable in engagement With the clamp at all positions thereof, means operative only after the clamp has seated on the car for positively holding one end of the cable against Inove-` inent and for exerting a tension on the other end of the cable to hold the clamp and car in xed position with respect to the cradle, the tension exerting means comprising a lever upon which one end of the cable is dead ended.

9. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable in engagement with the clamp at all positions thereof, means operative only after the clamp hasseated on the car for positively holding one end of the lcable against movement and for exerting a tension on the other end of the cable to hold the clamp and car in fixed position with respect to the cradle, said tension exerting means comprising a. lever upon which one end of the cable is dead ended, means operative only after the clamp is seated on the car for rotating the lever to exert a tension on the clamp holding cable and hold the clamp in Working position to support the oar.

l0. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable in engagement with the clamp at all positions thereof, means operative only after the clamp has Seated on the car for positively holding one end of the cable against movement and for exerting a tension on the other end of the cable to hold the clamp and car in fixed position with respect to the cradle, said tension exerting means comprising Va lever upon Which one end of the cable is dead ended, means operative only after the clamp is seated on the car for rotating the lever to exert a tension on the clamp holding cable and hold the clamp in Working position to support the car, said means being removed from the cradle.

11. In a car dumper comprising a rotary car supporting cradle, a car clamp movable thereon tovvard and from the car, a clamp holding cable in engagement with the clamp at all positions thereof, means operative only after the clamp has seated on the car for positively holding one end of the cable against movement and for exerting a tension on the other end of the cable to hold the clamp and car in fixed position with respect to the cradle, said tension exerting means comprising a lever upon which one end of the cable is dead ended, means operative only after the clamp is seated on the car for rotating the lever to esert a. tension on the clamp holding cable and hold the clamp in Working position to support the car, said means comprising a counter- Weight removed from the cradle and a cable interposed between the counterweight and the lever.

l2. In a car dumper comprising a rotary car supporting cradle, a car clamp movable.

thereon toward and from the car, a clamp holding cable in engagement with the clamp atall positions thereof, means operative only after the clamp has seated on the car for positively holdingone end of the cable against movement and for exerting a tension on the other end of the cable to hold the clamp and car in fixed position with respect to the cradle, said tension exerting means comprising a lever upon which one end of the cable is dead ended, means operative only after the clamp is seated on the car for rotating the lever to exert a tension on the clamp holding cable and hold the clamp in Working position to support the oar, said means comprising a countertveight removed from the cradle and a cable interposed between the counterweight and the lever, the cable being dead ended on the lever extending over a sheave on the counterweight guide, thence over a sheave on the counterweight, thence back over a second sheave on the counterweight guide to and dead ended on the cradle.

13. In a car dumper comprising a rotary car supporting cradle a car clamp movable thereon toward and from the car, a clamp holding cable, means for taking up the slack therein as the clamp moves toward the car and means operative only after the clamp has seated on the car for positively holding the take-up end of the cable against displacementv with respect to the cradle.

14:. In a car dumper comprising a rotary car supporting cradle a car clamp movable thereon toward and from the car, a clamp holding cable, means for taking up the slack therein as the clamp moves toward the car and means operative only afterthe clamp has seated on the car for holding the take-up end of the cable against displacement, the take-up means including a differential pulley about which the cable travels and a separate cable connection between the differential pulley and the clamp.

l5. In a car dumper comprising a rotary car supporting cradle a car clamp movable thereon toward and from the car, a clamp holding cable, means for taking up the slack therein as the clamp moves toward the car and means operative only after the clamp has seated on the car for holding the take-up end of the cable against displacement, the takeup means, including a differential pulley about which the cable travels and a separate cable connection between the differential pulley and the clamp, a sheave over Which such separate cable connection travels being located "on the sideof the clamp removed from the differential pulley.

16. A car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holdi cable means responsive to the movemento the clam toward its seat on the car for maintainin t e cable taut independent of the position o the clamp, means operative only after the clamp is seated for positively hldng `one end of the cable against movement lwith respect to the cradle.

"179A cardumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holdin cable, means responsive to the movement o the clamp toward its seat on the car for maintaining the cable taut independent of the ition of the clamp, means for positively olding one end of the cable against movement operative `only after the clamp is seated and means operative only after the cable is soheld associated with the opposed end of the cable for exerting a tension thereon tolock the car in place on the cradle.

18. A car dumper comprising a rotary car supportingcradle, a car clamp movable thereon toward and lfromthe car, a clamp holding oable,means responsive to the movement of the clamptoward its seat on the car for maintaining t e cable taut independent of the positionwof the clamp, means operative only liter the clamp is seated for positively holding one end of the cable against movement with `respect to thecradle, the cable holding means comprising a brake operative responsive to the rotation of the cradle.

19. `A cardumper comprising a rotary car supporting cradle, a car clamp movable theaeon toward and from the car, a clamp hold `cable, means responsive to the movement o vthe clamp toward its seat on the car for maintainingthe cable taut independent of the `sition of the clamp, means for positively 1 olding one end of the cable against movement operative only after the clamp is seated and means operative only after the cable is soheld associated with the opposed endof the gable for exerting a tension thereon toilock the car in place on the cradle, the tension exerting means comprising a movable member upon which the cable is anchored and means responsive to the rotation of the cradle for displacing it.

20. A car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable, means responsive to the movement of the clamp toward its seat on the car for maintaining the `cable taut independent of theposition ofthe clamp, means for positively holding one end of the cable against movemento e'rative only after the clamp is seated, an means operative only after the cable is' so held associated with the opposed end of the cable for exerting a tension thereon to lock the car in place on the cradle, the tension exerting means com rising a movable member upon which the ca le is anchored and means removed from the cradle and responsive to the rotation thereof for displacing it.

2l. A car dumper comprising a rotary car supporting Cradle, a car clamp movable thereon toward and from the car, a clamp holding cable, means responsive to the movement of the clamp toward its seat on the car for maintaining the cable taut independent of the position of the clamp, means for positively holding one end of the cable against movement operative only after the clamp is seated,

and means operative only after the cable is so held associated with the opposed end of the cable for exerting a tension thereon to lock the car in place on the cradle, the tension exerting means comprising a movable member upon which the cable is anchored and means removed from the cradle and responsive to the rotation thereof for displacing it, said means comprising a counterweight.

22. A car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable, means responsive to the movement of the clamp toward its seat on the car for maintaining the cable taut inde )endent of the position of the clamp, means or positively holding one end ofthe cable against movement operative only after the clamp is seated and means operative only after the cable is so held associated with the opposed end of the cable for exerting a tension thereon to lock the car in place on the cradle, the tension exertingmeans comprising a movable member upon which the cable is anchored and means responsive to the rotation of the cradle for displacing it, the movable member comprising a. lever on one end of which the cable is dead ended, the movable member displacement means being associated With the opposed end of the lever.

23. A car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from the car, a clamp holding cable,means responsive to the movement of the clamp toward its seat on the car for maintaining the cable taut independent of the position of the clamp, means for positively holding one end of the cable against movement operative only after the clamp is seated, and means operative only after the cable is so held associated with the opposed end of the cable for exerting a tension thereon to lock the car in place on the cradle, the tension exerting means comprising a movable member upon which the cable is anchored and means removed from the cradle and responsive to the rotation thereof for displacing it, a movable member comprising a lever on onel end of which the cable is dead ended, a movablemember displacement means being associated With the opposed end of the lever.

24. A car dumper comprising a rotary car supporting cradle, a car clamp movable thereon toward and from `the car, means operative respcmsive` to the rotation of the cradle for raising the clamp aWay from' the car, the clamp being tree to descend owing to its oivn Weight under the influence of gravity into engagement With the car as the clamp raising means are gradually released responsive to the movement ot the cradle toward the dumping position, a clamp holding system comprising a cable interposed between the clamp and the cradle and movable with the clamp, means operative after the clamp has seated on the car for holding one end of the cable positively against further movement, and means associated with the other end ot the cable for exerting an increased tension thereon to lool; the car in position on the cradle.

25. ln a car damper comprising rotary car supporting cradle, car clamp movable on the cradle toward and from the car, a carriage movable on the cradle, a cable connection between the carriage and the clamp, a stop removed from the cradle extending into the path of the carriage whereby as the cradle and car approach the upright position the stop and carriage engage one another to draw out the cable yand raise the clamp away from the car, a clamp holding system comprising a lever pivoted on the cradle, a. positive stop against which the lever rests, a cable dead ended on the lever tending to pnll the lever against the stop, sheaves on cradle and clamp over which the cable travels, a ditlerential pulley associated With the cable, the cable anchored at one end on the clamp, extending thence to and about the dilerential pulley, thence about the sheaves on the cradle, thence about the sheaves on the clamp, thence about the sheave on the cradle and thence to the lever whereby the cable system -is always tant independent of the position of the clamp.

26. In a car damper, a rotary car supporting cradle, a clamp movable therein toward and from the car, al cable encircling the clamp, means for holding one end of the cable against movement While the clamp is out of contact with the car and means for taking up slaclr in the other end of the fout of Contact With the car and means for taking up slack in the other end of the cable asthe clamp approaches the car, means for locking the take up When the clamp is seated on the car and means associated With the tirst mentioned end of the cable for exerting an increased tension thereon after the clamp is seated on the car, a tension exerting means comprising a lever pivoted on the cradle upon which the end of the cable is dead ended and a counterweight associated With the lever.

28. ln a car dumper, a rotary car supporting cradle, a clamp movable therein toivard andv from the car, a cable encircling the clamp, means .for holding one end of the cable against movement While the clamp is ont ot contact with the car and means for taking up slaclr in the other end of the cable as the clamp approaches the car, means for locking the take up When the clamp is seated on the car and means associated with the first mentioned end of the cable for exerting an increased tension thereon after the clamp is seated on the car, exerting means comprising a lever pivoted on the cradle upon which the end of the cable is dead ended and a. connterweight associated with the level-,a structure separate from the cradleV upon which the counterweight is mounted.

29. ln a car dumper, a rotary car supporting cradle, a clamp movable therein to- Ward and from the car, a cable encircling the clamp, means for holding one end of` the cable against movement While the clamp is out ot contact with the car and means for taking up slack in the other end of the cable as the clamp approaches the car, means for locking the take up when the clamp is seated on the car and means associated with the first mentioned end of" the cable for exerting an increased tension thereon after the clamp is seated on the car, the take up means comprising a drum about Which the cable is Wound and a brake for locking the drum.

30. In a car dumper, a rotary car supporting cradle, a clamp movable therein toward and from the car, a cable encircling the clamp, means for holding one end of the cable against movement While the clamp is ont of contact with the car and means for taking up slaclr in the other end of the cable as the clamp approaches the car, means for locking the take up When the clamp is seated on the car and means `associated with the first mentioned end of the cable for eX- erting an increased tension thereon after the clamp is seated on the car, the take up means comprising a drum about which the cable is Wound and a brake for locking the drum, means for rotating the drum comprising a take np cable arranged generally in parallel With the irst mentioned cable and associated With the clamp.

, 31, ln a car damper a car holding clamp movable toward the car, a holding cable associated therewith, means associated with one end of the cable for taking up the slack therein as the clamp moves toward the car, means for locking the cable against retrograde movement when the clamp is seated on the car, and means associated with the other end of the cable for increasing the tension therein to draw the clamp toward the car.

32. In a car dumper a car holding clamp movable toward the car, a holding cable associated therewith, means associated with one end of the cable for taking up the slack therein as the clamp moves toward the car, and means associated with the other end of the cable for increasing the tension therein to draw the clamp toward the car, the slack take-up means comprising a take-np cable associated with the clamp, in opposition to the holding cable whereby the movement of the Vclamp toward the car, which causes slack in the holding cable, draws ont the take-up cable, a drum about which both cables are wound in opposite directions, and means for locking the drum against rotation to prevent retrograde movement of the holding cable. 33. In a car dumper a car holding clamp movable toward the car, a holding cable associated therewith, means associated with one end of the cable for taking up the slack therein as the clamp moves toward the car, means for locking the cable against retrograde movement when the clamp is seated on the car, and means associated with the other end Tof the cable for increasing the tension therein to draw the clamp toward the car, comrisin a lever upon which the holding cable 1s anc ored and positive means for preventing the movement of such anchorage in a di- J rection tending to decrease pull on the cable and means for rotating the lever to move the anchorage in the opposite direction to increase pull on the cable, said means comprising a cable, said cable attached to the free end of the lever and a counterweight suspended by said cable.

34. In a car dumper a car holding clamp movable toward the car, a holding cable associated therewith, means associated with one end of the cable for taking up the slack therein as the clamp moves toward the car, means for locking t-he cable against retrograde movement when the clamp is seated on the car, and means associated with the other end of the cable for increasing the tension therein to draw the clamp toward the car, comprising a lever upon which the holding cable is anchored and positive means for preventing the movement of such anchorage in a direction tending to decrease pull on the cable and means for rotating the lever to move t-he anchorage in the op osite direction to increase pull on the cale, the lever rotating means including a counterweight.

35i In a car damper a car holding clamp movable toward the car, aholding cable associated therewith, means associated with one end of the cable for taking up the slack therein as the clamp moves toward the car, means for locking the cable against retrograde movement when the clamp is seated on the car, and means associated with the other end of the cable for increasing the tension therein to draw the clamp toward the car, comprising a lever upon which the holding cable is anchored and positive means for preventing the movement of such anchorage in a direction tending to decrease pull on the cable and means for rotating the lever to move the anchorage in the opposite direction to increase pull on the cable, the lever rotating means comprising a counterweight, se arate supporting means therefor, and a cabll) interposed between the free end of the lever and the counterweight.

36. In a car dumper a car holding clamp movable toward the car, a holding cable associated therewith, means associated with one end of the cable. for taking up the slack therein as the clamp moves toward the car, means for locking the cable against retrograde movement when the clamp is seated on the car, and means associated with the other end of the cable for increasing the tension therein to draw the clamp toward the car, said means including a counterweight.

Signed at Chicago, county of Cook and State of Illinois, this 28th day of November,

ELWIN H. KIDDER.

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