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Publication numberUS2742863 A
Publication typeGrant
Publication dateApr 24, 1956
Filing dateMar 27, 1953
Priority dateMar 27, 1953
Publication numberUS 2742863 A, US 2742863A, US-A-2742863, US2742863 A, US2742863A
InventorsCarl Burkitt
Original AssigneeLink Belt Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Car haul
US 2742863 A
Abstract  available in
Images(2)
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Claims  available in
Description  (OCR text may contain errors)

C. BURKITT CAR HAUL April 24, 1956 2 Sheets-Sheet l Filed March 27, 1953 mx w a a C. BURKITT CAR HAUL 2 Sheets-Sheet 2 Filed March 27, 1953 Illnsl@ @ie elaul- .III Mwvwlmml Il f MN Nw: WN 1 mw .I I A w CAR HAUL Carl Burkitt, Chicago, Ill., assignor to Link-Belt Company, a corporation of Illinois Application March 27, 1953, Serial No. 344,947 12 Claims. (Cl. 1134-172) This invention in car haul more particularly with the downgrade advancement of such trips.

Where such a procedure 1s not practical, it has been necessary to install separate car hauls for moving the trips-of cars upgrade and downgrade.

It is `the primary object of this invention to provide a engaging and moving trips of ycars in either direction along an inclined track section.

movement. f

Another important object of the invention is to provide a car haul with a device for maintaining the proper Spacproperly engaged pusher dogs of the haul to prevent overrunning of the haul by the cars.

A still further important object providea car haul which is capablevof properly engaging haulv as the haul isA further advanced, f

Figure'is a similar view to Figs. 1 and 2 but showing the positions assumed by the cars and the pusher dogs after the retarding device has been released,

' -Figure 4 is a similar view to Figs.`1, Zand 3 but showlng-fthel positions of the cars andlpusher dogs'just prior g United States Patent() retarding dog and Y. tions, y the pusher dogs 21 of each 2,742,863 Patented Apt-24, 1956 In the drawings, wherein for the purpose of illustra` tion is shown a preferred embodiment of this invention, and rst ets 17 is drivenk either intermittently or continuouslyl by a reversible motor 19 `which is drivingly connected to the sprocket by a belt 19a, or the like.

At uniformly spaced their car engaging active run of the chain. While in their car engagingposithe said control device. v f The dashpot unit includes a cylinder 243 having its axis in parallel relationship with the rails 11.

from. I ositiprtedA between the piston 2S and the outer end `wall of the cylinder 24 is a stop collar 28. The inner end portion of the cylinder 24 is provided with two longitudinally spaced, side wall apertures 29 and 3.1 while a third aperture 32 extends through the side wall into the clearance space provided by the stop collar 28. The piston 25, therefore, is movable inV oppositeA directions between a position abutting the stop collar 2,8` and a position adjacent the aperture 29.

The apertures 29 and 32 are connected to the opposite ends of a pair of parallel branch pipes 33 and 34. Mounted in the branch pipe 33V is an adjustable orifice valve 35 for controlling the rate of ow of fluid through this pipe. Branch pipe 34, is provided with a check valve 36 for permitting only unidirectional flow of uid from the aperture 32 toward the apertures 29 and 31. The branch pipe 34 also is connected to the aperture 31 to thereby permit the free flow of iluid between the apertures 29 and 31.

Connected to the operating rod 26 by a cable 37 is a counterweight 38 which is suspended from the pulley 39 to urge the piston 25 toward its stop collar 28. Mounted in the outer end portion of the operating rod 27 is a turn buckle 40 by means of which the length of this operating rod may be adjusted.

The outer end of the rod 27 is pivotally connected to a control device, as illustrated in Figs. 6 and 7. The control device consists of a carriage 41 formed of a pair of tranversely spaced side bars 41a that are connected by a pair of longitudinally spaced axes 42 upon which are mounted wheels or rollers 43 and a retarding dog 44 that is pivotally mounted between the side bars 41a. The retarding dog 44 is gravitationally actuated for movement toa normal position at which the dog is held against further pivotal movement in a backward direction by its engagement with one of the axles 42.

The carriage 41 is supported by a guideway formed of a pair of oppositely arranged, inwardly opening channel beams 45 mounted on brackets 46. The channels 45 extend in parallel relationship with the rails 11 to support the carriage 41 for movement with the cars A, B, C and D for a distance that corresponds with` the travel of the piston 25 between its stop collar 28 and a position just beyond the aperture 31. The channels 45 thereafter are inclined downwardly in angular relationship with the rails 11 to effect pivotal movement of the carriage 41, relative to the rod 27, as the piston 25 is moved the remainder of its distance of travel through the cylinder 24. The retarding dog 24 thereby is caused to move downwardly a sufficient distance to clear the lugs 23 on the cars. It will be readily apparent that the lugs 23 of the cars moving in an upgrade direction will merely effect pivotal movement of the retarding dogs 24 and will have no elfect on the position of the carriage 41.

Operation of the car haul in eiecting movement of a trip of cars downgrade will be described as follows:

First referring to the disclosure provided by Fig. 4, it will be assumed that the car haul has been stopped with one of its pairs of pusher dogs 21 positioned in the upper run of the chain 16 at a location which is no further advanced to the right than is illustrated in this ligue. When so arranged, the next succeeding pair of pusher dogs will be positioned below the path of movement of the car` lugs 23.

In assuming this starting position, the first two cars of the trip have advanced by gravity down the rails 11 and their lugs 23 have successively engaged and actuated the retarding device. That is to say, the lugs 23 of the cars A and B have successively engaged the retarding dog 44 of the carriage 41 and have advanced the carriage a suicient distance along its channel beams 45 to permit the lugs to clear the dog 44. The lug 23 of the car A is illustrated as engaging the contact face 22 of its leading dog 21. Because the car haul is not being driven by the motor 19, this engagement of the lug 23 of car A will cause the haul to hold thc entire trip of carsv with their tongues 14 in abutting engagement. It will be noted that the lug 23 of car B is clear of both of its pusher dogs 21 while the lug 23 of car C is substantially spaced from the retarding dog 44.

Fig. 1 is intended to illustrate the relative positions of the various cooperating elements after the car haul has been placed in operation and the cars A, B and C have advanced to the illustrated positions. When thus arranged, the lug 23 of car A is still engaging the contact face of its associated, leadingl pusher dog 21, while the lug 23 of car B is overlying theleading pusher dog of its associated pair, and the lug 23 of car C has just engaged the retarding dog 44. Up to this point, the engagement of the lug 23 of car A with its associated leading pusher dog 21 has held he entire trip of cars from advancing at too rapid a rate down the rails 11.

Fig. 2 illustrates the relative positions of the various cooperating elements after the chain 16 of the car haul has advanced a suiicient distance to position the second pair of pusher dogs in its upper run. The retarding device has functioned, due to the engagement of its dog 44 with the lug 23 of car C, to restrain the forwardmovement of cars A, B and C suiciently to cause the tongues 14 of these cars to be separated and the lug 23 of car A to engage the trailing pusher dog 21, of its associated pair while the lug 23 of car Bis caused to enter the space between its associated pusher dogs 21. In other words, the car haul has been functioning to advance cars A, B

and C against the retarding force exerted by the dog 44` and its associated mechanism. It, further, will be noted that the carriage 41 of the retarding mechanism has just started to move down the inclined portions of its supporting beams `45 with the result that further movement of the cars A, B and C by the haul will cause the lug 23 of car C to be moved out of engagement with the retarding dog 44.

Fig. 3 illustrates the positions assumed by cars A, B and C after lug 23, not shown, of car C has advanced beyond the retarding dog 44. It will be noted that cars A and B have coasted down the rails 11 a suicient distance to cause the lug 23 of car B to contact the leading pusher dog 21 of its associated pair, while the lug 23 of car A has moved out of contact with the trailing pusher. dog 21 of its associated pair. The leading pusher dog 21 associated with car B now is retarding all of the cars of the trip. Cars B, C and D will assume the positions occupied by cars AB and C in the illustrations afforded by Figs. l and 2.

After the lug 23 of each car has advancedout of engagement with the retarding dog 44, the counterweight 38 will function to move the piston 25 from right to left` through its cylinder 24 until the piston 25 again engages the stop collar 28. This movement of the piston 25 will cause the carriage 41 to be returned to the position, illustrated in Fig. 1 where the retarding dog 44 will be` in readiness to engage the lug 23 of car D.

The operation of the retarding mechanism to restrain the advance of each successive car of the trip will now be.

described. Y

The normalv starting positions of the dog 44 and carriage 41 are illustrated in Figs. 1 and 4. The carriage is urged into this position by the action of the counterweight` 38. When one of the car lugs 23 is moved into engagement with the dog 44, however, the dog and carriage will be moved along the guideway formed by the channels 45 in a direction away from the cylinder 24. This movement,

of the carriage 41 acting through the operating rody27 will move thepistonZS away from its stop collar 28l and will force the uid inthe cylinder 24 at the right of the-t` piston 25 to ow .through the apertures.l and 31, the branch pipe 33, he restricted orifice valve 35 andthe aperture 32 into the opposite end ofthe cylinder attire;

efr-raises left of the piston 25. Due to the restriction provided by the valve 35, the rate of ow of the fluid is reduced suciently to cause the'movement of the piston 25 to be retarded to the desired extent. It will be appreciated that the check valve 36 will prevent How of iluid through the branch pipe 34 to the aperture 32.

When the piston 25 has been moved, by the force applied by the lug 23 to the retarding dog 44, to a position at which the aperture 31 is on the opposite side of the piston from the aperture 29, the carriage 41 also will have moved to the inclined portion of the guideway formed by the channels 45. At this time, the tluid owing from the cylinder 24 through the aperture 29 is bypassed to the opposite side of the piston through the aperture 31 so that the retarding elfect of the valve 35 is eliminated andV the carriage 41 will move easily and quickly down the inclined portion of the channels 45 to release the retarding dog 44 from the lug 23, as illustrated in the broken-line position of Fig. 6.

After the Vretarding dog 44 is released from the lug 23, the carriage 41 will be quickly returned to its starting position by the counterweight 38 connected by the cable 37 to the operating rod 26. The movement of the piston ,to the left in its cylinder is unretarded due to the free -ow of fluid through the aperture 32, the check valve 36 and the pipe 34 into the opposite end portion of the cylinder through both of the apertures '29 and 31.

Adjustment of the carriage 41 relative to the operating rod 27 by the turn buckle 40 will provide accurate spacing between the piston and the inclined portion of the channels 45 to provide the above described operation decrease the retarding action of the dog 44.

It will be readily apparent that the retarding dog 44 will have no elect upon the cars of a trip that is moved up the mcllned track and that such a trip Will be stretched by gravitational pull to provide proper spacing between the lugs 23 of adjacent cars so that they will register with the pusher dogs 21.

It is to be understood that the form of this invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit ofthe invention or the scope of the subjoined claims.

Having thus described the invention, I claim:

1. In mechanism for controlling the advance down an inclined track section of a trip of cars loosely coupled together and each car having a control projection, an endless chain haul having its active run driven in the same direction as and in parallel relationship with the trip, a plurality of control devices attached to the chain haul at intervals which are spaced to operatively register with the control projections on adjacent cars of the trip when the cars are spaced the maximum distance permitted by their couplings, each of said control devices engaging its car control projection upon registering therewith to alternately restrain the coasting of the trip down the track section and apply a force to advance the trip down said track section, and a retarding mechanism positioned upgrade from the car haul for applying a retarding force to an adjacently positioned car of the trip each time a control device of the haul applies an advancing force to the trip to thereby space to the maximum distance the cars entering the haul so as to el'lect the registering of each car haul control device with the control projection of its respective car.

2. A mechanism as dened in claim l further characterized by said retarding mechanism having a reciprocatory control device for successively engaging the control projections on the cars of the trip to apply said retarding force.

3. A mechanism as defined in claim 2 further characterized by the retarding mechanism including a one-way terized by the reciprocatory control device including a wheeled carriage, a dog pivoted on the carriage for enreciprocatory movements.

5. A mechanism as dened in claim 4 further characterized by a one-way acting dashpot unit for retarding 6. A mechanism as dened in claim 4 further characterized by the guiding means for the wheeled carriage 7. A mechanism as defined in claim 6 further characterized by a one-way acting dashpot unit for retarding the opposite end portions of said cylinder, an adjustable orifice valve controlling the rate of flow of ud through one of said ilo'w paths to retard the rate of movement of the reciprocatory control device in one direction, and a one-way acting check valve in the other of said tiow 9. In a mechanism for controlling the advance down an inclined track section of a trip of cars loosely coupled together and each having a control lug, an endless chain haul having its active run driven in the same direction as and in parallel relationship with the trip, a plurality of pairs of dogs, having spaced contact faces, attached to the chain haul at intervals which are spaced to cause the contact faces to operatively register with the lugs Of adjacent cars when the cars are spaced the maximum distance permitted by their couplings, said contact faces alternately engaging their associated lug to restrain coasting of and to advance the trip down the track section, and a re 10. A mechanism as defined in claim 9 further characterized by said retarding dog having a guideway with a major portion of its length in parallel relationship with said track to support the dog for movement by the lug and with it's inner end portion inclined away from said track to guide the dog into a position for release from said lug, and a uicl containing cylinder having a piston therein connected to the dog for movement therewith against the pressure of the uid in the cylinder to retard movement of the dog by the lug.

1l. A mechanism as defined in claim 9 further characterized by a cylinder, a piston movable in said cylinder to inversely vary the volumes of the chambers on opposite sides of the piston, a pipe providing restricted communication between the chambers, a second pipe providing open communication between said chambers, a valve associated with said second pipe for preventing ow from one of the chambers to the other through the second pipe, and a rod extending from said piston for connection to the dog to cause movement of the latter by the lug to reduce the volume of said one chamber, said movement of the dog by the lug being retarded by the restricted ow of uid from said one chamber to the other through the rst mentioned pipe and return of the dog to its normal position being facilitated by free flow of fluid through said second pipe.

l2. In mechanism for conrolling the advance down an inclined track section of a trip of cars loosely coupled together and each having oppositely directed control faces, an endless chain haul having its active run driven in the same direction as and in parallel relationship with Cil said trip, a plurality of pairs of dogs, having spaced contact faces, attached to the chain haul` at intervals which are spaced t'o cause the contact faces to operatively register with the control faces of adjacent cars when the cars are spaced the maximum distance permitted by their couplings, said contact faces alternately engaging their registered control faces to restrain coasting of and to advance the trip down the track section, and a dog mounted for retarded movement from a normal position upgrade from the haul toward said haul to a release position by ca gement with a control face of an adjaccntly positioned ar, retarded movement of said adjacently positioned car effecting the retarding of that portion of the trip upgrade from the retarding dog to cause a dog pair of the haul to advance that portion of the trip downgrade from the retarding dog relatively to the remainder of the trip to hereby etect said maximum spacing between cars entering the trip.

References Cited in the tile of this patent UNITED STATES PATENTS

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1942247 *Feb 5, 1931Jan 2, 1934Fort Pitt Mine Equipment CompaCar handling apparatus
GB295120A * Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2990941 *Mar 31, 1958Jul 4, 1961RenaultLoad driving members of conveyors
US3013499 *May 5, 1958Dec 19, 1961Cie Francaise De L Afrique OccConveyer systems
US3311066 *Feb 9, 1965Mar 28, 1967Mckay Machine CoApparatus for use with presses and the like
US3759405 *Jul 7, 1971Sep 18, 1973Barry RMethod and apparatus for loading trucks
US3910198 *Apr 18, 1974Oct 7, 1975Rexnord IncChain-driven dog
US4144818 *Jun 30, 1977Mar 20, 1979Du Pont Of Canada LimitedStorage system for wheeled buggies and apparatus therefor
US4461379 *Sep 2, 1982Jul 24, 1984Litton Industrial Products, Inc.Pallet conveyor
DE1247218B *Jan 24, 1964Aug 10, 1967Gerhard Lingg Dipl IngVorrichtung zum Kuppeln und Entkuppeln von ueber Mitnehmer mit einer Schleppkette kuppelbaren Lastentraegerwagen untereinander
Classifications
U.S. Classification104/172.3, 104/178
International ClassificationB61J3/04, B61J3/00
Cooperative ClassificationB61J3/04
European ClassificationB61J3/04