US903921A

US903921A - Dumping-car.

Info

Publication number: US903921A
Application number: US41911108A
Authority: US
Inventors: Munson H Treadwell; Carl P Astrom
Original assignee: MH Treadwell Co Inc
Current assignee: MH Treadwell Co Inc
Priority date: 1908-03-04
Filing date: 1908-03-04
Publication date: 1908-11-17
Anticipated expiration: 1925-11-17

Description

M, H. TREADWELL & O. P. ASTROM.

DUMPING GAR.

APPLICATION FILED MAR. 4, 1908.

Patented N0v.17, 1908.

2 $HEETSSHEET 1.

amvawfom M. H. TREADWELL & C. P. ASTROM.

DUMPING GAR.

APPLICATION FILED MAR. 4, 1908. 903,921 Patented Nov. 17, 1908. 2 SHEETSSHEET 2.

u t? 1] "r M M G? W ww fo m 1 a omun 4 UNITED STATES PIETENT MUN SON H. TREADWELL, OF NEW YORK, N. Y., AND CARL P. AS TROM, OF EAST ORANGE, NEW JERSEY, ASSIGNORS TO M. H. TREADWELL COMPANY, A CORPORATION OF NEW YORK.

DUMPING CAR.

Specification of Letters Patent.

Patented Nov. 17', 1908.

To all whom it may concern."

Be it known that we, MUNSON H. TREAD- wELs. and CARL P. Asraon, citizens of the United States, residing at New York, in the county of New York and State of New York, and East Orange, county of Essex, and State of'New Jersey, respectively, have invented certain new and useful Improvements in Dumping-Cars, of which the following is a full, clear, and exact specification.

This invention relates to dumping cars, and has particular reference to cinder cars or the like wherein a tilting and laterally movable car body is mounted to be dumped in opposite directions, from a central upright position, as may be desired.

More particularly, the invention relates to power actuated dumping cars and has for its objects to provide automatic means for checking the movement of the car body as it approaches the end of its outward movement, whereby the use of separate checking devices is avoided.

According to one embodiment of the invention herein illustrated and described, actuatmg. pressure 1s admitted to one s de ,of

-the motor cylinder to set the car body in mo tion, and after it has completed a predetermined portion of the stroke the actuating pressure is automatically admitted to the op- .posite side of the motor cylinder and the fur- 'thcr movement of the car body is opposed at this pressure, so that the car body comes to rest-.at. its extreme outward. position gently without straining the apparatus. By this mechanism, it is possible to attain a much higher checking pressure (as distinguished from actuating pressure) than has heretofore been the case.

The invention will be more fully under-' stood in connection with the description of the accompanying drawings, wherein Figure 1represents an end view ofa dump car embodying the invention, Fig. 2 is a detail view showing the piping and valve arrangements whereby the automatic control is secured, and Figs. 3 and 4 are modifications of checking devices which may be used.

The car frame'comprises the usual under frame carried by end bolsters 1, the under frame not being herein shown. and is supported at the ends on trucks, which will not be particularly described herein as these may be arranged according to particular necessities. The bolsters 1 each have astationary rack 2 and a track 3, and the car body 4 is preferably secured to a bail 5 which is'proend of the car bodyi, and rollers S which roll on the tracks, the parts thus far described being of well known construction.

In order to actuate the car body, a movable cylinder 9 in combination with a fixed piston 10 and piston rod 11 is used, the cylinder having a box at one side to engage the trunnions 6 and a key 12 being provided to hold the trunnion at one or the other side of the cylinder, according to the side on which the car body is to be dumped. The cylinder slides on upper and

lower guides

13, 14 carried by the end bolster 1, and the piston rod is made hollow from each end to the respective sides of the piston so as to receive a supply of fluid pressure through the

pipes

15, 16, which are controlled by a two-way valve 27 to move the cylinder from one lo the other side. When it is desired to change th-e'side on which the car body is to dump,

the key 12 is removed and the cylinder while thus disconnected from the trunnion is again re-connected at the end of the movement, in the well known way In order to automatically check the m0vc ment after a predetermined portion of the stroke, the cylinder l) is provided with a plu rality of ports intermediate its ends, with which are connected respectively

pipes

17, 18, leading to a valve casing 11) containing a movable valve or plug 20. From one end of the valve casing 15) a pipe 21 leads to the right end of the cylinder 9, and a pipe 23 leads from the valve casing 19 to the left end of the cylinder 9. The pipe 21 contains a check valve 22 opening from the valve casing 19 towards the cylinder 9, and the pipe 23 contains a similar check valve also opening towards the cylinder.

In the position shown in Fig. 2, the parts are in position to move the cylinder and the car body to the right, the controlling valve 27 being in such position as to admit pressure through pipe 15 to the right end of the cylinder. hen this is done, the cylinder 9 will move towards the right. the check valve 22 preventing any pressure from passing to the valve 19. As soon as the piston 10 has passed the port of pipe 17, the incoming pressure from pipe 15 will act to blow the valve plug20 to the left end of the valve cylinder 19, thereby uncovering the end of pipe 23 and connecting it with pipe 17 these pipes being at opposite sides of the piston 10. The efl'ect of this is to admit checking pressure on the left side of piston 10 through

pipes

17, 23, and check valve 22, this pressure cushioning the further movement of the cylinder, and after the piston passes the port, this pressure will be completely trapped, and the momentum of the car body will be effectually checked by the very high pressure which will thus be produced at the end of the stroke. At each end of the cylinder 9 is a pet cock 28, both of which will be normally closed. When the cylinder is to be moved to the right for instance, the pet cock at the left end may be opened manually for a short period of time in order to relieve any residual pressure and permit the car body to acquire momentum, after which it may be closed, and then the momentum of the car body will complete the movement. Also, the

- condensation in the cylinder reduces the pressure on the side of the piston to which,

the steam was last admitted so that ordinarlly when the cylinder is reversed the power is not materially reduced by not open ing the opposite side of the cylinder to the exhaust. The valve 27 connects the steam pressure with one or the other of

pipes

15 or 16, leaving the other end of the cylinder closed. Without this, as soon as the cylinder uncovers the

pipes

17 or 18, the checking pressure would, instead of being confined in the cylinder, rush out through the open exhaust, though the exhaust could be opened for a time if desired. By admitting checking pressure on the opposite side of the cylinder after the car body has acquired a sufficient momentum, the further movement will be eifectuallychecked, and at the end of the movement considerably more than actuating pressure will be present for checking pressure, which is not the case where the checking movement is dependent upon such amount of air as may be compressed therein from atmospheric pressure, or by simply admitting the actuating pressure to the other side without trapping it. This high checking pressure will only be needed momen tarily unless it is used to start the reverse movement, and will be relieved by condensation or by the

valves

27 or 28.

In Figs. 3 and 4, a movable piston and fixed cylinder is shown, instead of the movable cylinder and fixed piston, as in Figs. 1 and 2, but the forms shown in Figs. 3 and 4 are equally applicable to the movable cylinder construction shown in Figs. 1 and 2. In this form, the pressure is admitted to either end of the cylinder by a 4-way controlling valve 37, through

pipes

30 or 31 iiaving check valves 32 opening towards the cylinder, to start the movement, and after apre determined movement the piston 10 uncovers a pipe 33 or 34 and admits pressure independently of the

pipe

30 or 31 containing a check'valve 32. At the same time, the pipe 34 is open to the exhaust so that the movement is unrestricted until near the other end, when pipe 34 will be covered by the piston, and the remainder of the movement will be against the fluid pressure accumulated at the ends of the cylinder, it being unable to escape at the end by reason of the'check valve 32. Vhen it is desired to'start in the opposite direction, the check valve opens to admit the pressure until the pipe 34 is uncovered. Thus the movement will be automatically cushioned at the ends and for a proportion of the stroke dependent upon the positions of the pipes 33 and 34. It willbe seen that in all cases one or the other ofthe check valves will open to permit the movement in the reverse direction, and the pressure can be relieved by pet cocks 28, as before.

In Fig. 4, a single pipe 3.6 at the middle of the cylinder permits exhaust until the piston 10 has passed it, the remainder of the stroke being checked by the accumulation of air or steam between the piston 10 and the end of the cylinder, it being unable to escape through thecheck valve 32, but one or the otherof these valves will open to admit actuating pressure when the movement is to be reversed. It will be understood that the forms shown in Figs. 3 and 4, while showingmovable pistons and fixed cylinders are equally applicable to the movable-cylinder and fixed piston construction shown in Figs.

l and 2, it not being considered necessary to further increase the illustration by showing such applications, as they are obvious to a skilled mechanic.- Y

From the foregoing, it will be seen that means is herein provided whereby the checking pressure can be made to considerably exceed the actuating pressure, which is an ini portant advantage, and so far as we are aware, not heretofore known. Furthermore, so far as we are aware, it has not heretofore been proposed to automatically admit this checking pressure at a predetermined portion of the stroke by means of a valve controlled according to the relative position of the cylinder and piston.

Modifications and changes in the specific apparatus herein described may be made: without departing from the scope of the invention.

Having thus described our invention, we declare that what we claim as new and de sire to secure by Letters Patent, is': f 1. The combination with a pressure operated dumping car body, of means for checking the movement of the car body by automatically admitting actuatingv pressure to the motor to oppose the movement.

2. The combination with a motor oper-' secure a maximum checking pressure at the end of the movement.

3. The combination with a motor operated dumping car, and a pressure actuated reciprocatory motor, of means for admitting pressure on one side to start the motor, 'means for trapping pressure o'n the other side at, a predetermined portion of the stroke to check the movement at the. end, 'and ;means..w hereby actuating pressure can be admitted to reverse the motor.

4. The combination with a motor operated dumping car, and a pressure actuated reciprocatory motor, of means for admitting pressure on one side to start the motor,-

means for trapping pressure on the other side at a predetermined portion of the stroke to check the movement at the end, means whereby actuating pressure can be admitted toreverse the motor, and means for relieving the checking pressure.

5. The combination with a motor 0 erated dumping car, and reciprocatory actuating means, of controlling means for actuating the motor, means. for automatically admit ting actuating pressure at a predetermined point of the stroke to check the movement, and means for automatically cutting off such pressure at a second of the stroke.

6. The combination with a motor operated dumping car, and'reciprocatory actuating means, of controlling'means for actuating the motor, means foraiitomatically admitting actuating pressure at a predetermined point of thestroke to check the movement, and means for automatically cutting ofl such pressure at a second predetermined portion of the stroke and before the end of ,the stroke. 7

7. The combination with a "tilting. and bodily movable car body, of an actuating piston and cylinder, means for admitting pressure on one side of, the piston to move the car body, means for admitting pressure on the other side of the piston at a predetermined portion of the stroke, and means for automatically cutting oflf the latter pressure upon a further predetermined movement.

predetermined portion predetermined movement.

9. j The combination with a tilting and bodlly movable car body, and an actuating cylinder and piston therefor, of means for admitting pressure at either end to actuate the car body, and. means controlled by the position of the piston relatively to the cylinder for admitting checking pressure to the exhaust side of the cylinder.

' 10. The combination with a tilting and bodily movable car body, and an actuating cylinder and piston therefor, of means for admitting pressure at either end to actuate the car body, means controlled by the position of the piston relatively to the cylinder for admitting checking pressure to the exhaust side of the cylinder, and means also controlled thereby for cutting off the actuating pressure from the exhaust side of the cylinder upon a further movement.

11. The combination with a tilting and bodily movable car body, and an actuating cylinder and piston therefor, of means for admittingpressure at either end to actuate the car body, a normally closed passage connecting separated portions of said cylinder around the piston, and a valve controlled by said piston for opening said passage at a predetermined point of the stroke.

12. The combination with a tilting and bodily movable car body, and an actuating cylinder and piston therefor, of means for admitting pressure at either end to actuate the car body, a normally closed passage connecting separated portions of said cylinder 'around the piston, and a valve controlled by sai piston for opening said passage at a pre etermined point of the stroke, and =niea-ns controlled by said piston for closing said passage after a predetermined move- ..ment of the motor. V

-In testimony whereof we afliX our signatures, in presence of twp gvitnesses.

MUNSON H:- TREADWELL. CARL P. ASTROM. Vitnesses: v

SAMUEL KETOHUM,

GEO. O. HOFFMAN.