US904136A - Valve for hydraulic elevators. - Google Patents

Description

A.- R. KLINGLOPP. VALVE FOR HYDRAULIC ELEVATORS. APPLICATION FILED 00T.14, 1905.

904,136. Patented Nov. 17, 1908.

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. A. R. KLINGLOPF.

VALVE ron HYDRAULIG ELEVATORS.

APPLICATION FILED OUT. 14, 1905.

Patented Nov. 17, 1908.

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PATENT oEEIoE.

ANDREW R. KLINGLOFF, OF BOSTON, MASSACHUSETTS.

VALVE FOR HYDRAULIC ELEVATORS.

Specification of Letters Patent.

Patented Nov. 17, 1908 Application filed October 14, 1905. Serial No. 282,745.

To all whom it may concern:

Be it known that I, ANDREW R. KLINe- LOFF', a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Valve for Hydraulic Elevators, of which the following is a specification.

This invention relates to that class of elevators which are operated by hydraulic pressure. Y

The especial object of this invention is to provide a self-contained valve for hydraulic elevators which will permit the elevator-car to be started promptly either up or down as desired, and which will prevent such sudden stoppages of the elevator car as will be liable to injure the apparatus.

To this end this invention consists of a form of elevator valve having its operating piston arranged to control a number of ports or passages, whereby the valve will be permitted to move freely from a central position to the end of its travel in either direction, but in which the speed at which the valve can move back to central position from either end of its travel will be limited by the flow of liquid through restricted or throttled passages.

This invention also consists of special arrangements and combinations of parts as hereinafter described and more particularly pointed out in the claims at the end of this specification.

In the accompanying two sheets of drawings, I have illustrated my invention applied to an elevator of the direct plunger type.

In the drawings, Figure 1 is a side view of sufficient parts of a hydraulic elevator to illustrate the application of this invention thereto. Fig. 2 is a side view of the valve. Fig. 3 is an enlarged sectional view of the valve showing the parts in the normal or central position occupied when the elevator is at rest. Fig. 4 is a detail view showing the position of the parts when the valve is shifted to permit the elevator-car to descend, and Fig.5 is a detail view showing the position of the parts when pressure is admitted to cause the elevator car to ascend.

In the operation of modern long run, high-speed elevators it is desirable that the controlling devices should be so constructed that the elevator car can be started quickly either to move up or down as desired, and when the elevator car is traveling with its maximum velocity it is desirable that it should stop comparatively slowly. This is particularly true of the high-speed elevator of the direct plunger type. In this class of elevators ii a too sudden stop isattempted when the car is traveling up, it sometimes happens that the momentum of the car, and particularly the momentum of the counterweight will be suflicient to cause the plunger to continue to travel up even after the supply of water is shut ofi thus causing the plunger to be separated from the water, and producing what is known as a bounding action. On the other hand, when the water is being discharged from the elevator casing and the car is descending rapidly, if it is attempted to stop the car too quickly, it results in producing a heavy water-hammer which is liable to break or injure the parts. To overcome these objections I have provided a valve for hydraulic elevators which is especially adapted for use in connection with an elevator of the direct plunger type, but which is applicable to any of the types of elevators operated by hydraulic pressure.

To secure the desired slow centering or stopping action of a valve constructed according to this invention, I utilize the operating piston of the main valve for shutting off and controlling the flow of water through passages which are ordinarily unrestricted, and I accomplish this result by providing a number of ports or openings'substantially at the center of the travel of the controlling piston. The controlling piston itself is provided with a cup'packing which moves over the ports or passages last referred to. WVhen this cuppacking is at one side of the central ports or passages it will resist the How of water tending to move in one direction, but will permit a free flow of water through said ports or passages in the opposite direction.

In addition to the ports or passages directly controlled by the piston I provide two adjustably throttled or restricted passages, one of which controls the flow of water when the main valve is moving down towards central position, the other of which controls the flow of water when the main valve is moving up towards central position.

Referring to the accompanying drawings for a detail description of one particular form of elevator-valve embodying this invention, as shown in Fig. 1, A designates the plunger casing. The plunger-casing A is provided at its upper end with a packingbox B, and extending down into the plunger casing is a plunger P which supports the elevator car C. 7

Opening into the plunger casing A is a supply pipe 10, and also opening into the plunger casing A is an outlet pipe 11. The flow of water to and from the plunger casing through the pipes 10 and 11 respectively is controlled by a valve, whiclnwhen constructed according to this invention, has provision for preventing too sudden stoppages of the elevator car.

The particular form of valve herein illustrated comprises a middle valve section or casing 12, a top casing section 13 having a discharge opening 14, and a bottom casing section 15 having a discharge opening 16.

Fastened onto the middle section of the valve casing is a pilot valve casing 17. Carried by the upper valve casing section 13 is a casing 18 containing the link-work for operating the pilot valve.

The interior construction of the pilot and main valves and the arrangement of pas sages therein are most clearly illustrated in the second sheet of drawings.

As shown in Fig. 3, 19 designates a lever which can be shifted by a rope R from the elevator car in the usual way. The lever 19 is pivoted in the casing 18, and is connected at its inner end to an intermediate point of a lever 20. One end of the lever 20 is connected by a link 21 to the main valve stem, and the other end of the lever 20 is connected to the pilot valve stem 22.

Mounted in the upper section 13 of the main valve casing is a lining 23, and moving up and down in the lining 23 is a cup-packing or piston 24 carried by the main-valve stem. Also mounted in the upper section 13 of the valve casing is a lining 25 which is slotted or provided with outlet passages, and moving up and down in the lining 25 is a cup-packing or piston 26, which, when lifted, opens connection between the pipe 11 and the discharge passage 14. Mounted in the second valve casing section is a lining or pipe 27 and movable up and down in the pipe 27 is a cup-packing or piston 28 which separates the inlet and outlet pipes 10 and 11. Mounted in the lower section 15 of the valve casing is a lining 29 which is provided with slots or openings for admitting pressure, and movable up and down in the lining 29 is a cup-packing or piston 30 which normally cuts off pressure from the pressure pipe 10, but which admits pressure therethrough when moved down past the slots or openings in the lining 29.

Secured on the lower end of the main valve stem is a thimble-shaped piece 31 having ring-shaped operating piston 52 having an inner annular enlargement or groove 50, and provided with an annular cup-packing 32. The operating piston 32 moves up and down on a guide-pipe 33, which it fits loosely so that water may flow between the guide and piston. The guide pipe 33 is provided with a transverse partition and with a central tube 34.

The opening into the central tube 34 is controlled by a throttling plug There is a free connection through ports between the bottom passage of the valve controlled from the pilot valve, as hereafter explained, and the annular space around the central tube 34, this annular space having ports or outlets 51 opening therefrom arranged substantially centrally with respect to the run of the operating piston 32 which shifts the main valve.

When the operating piston is above the central ports or passages 51, water admitted through the same will act directly to lift the main valve, but when the operating piston is below these ports or openings, the cupshaped nature of the packing 32 will cut ofi' the flow of water down through said central ports or openings, and pressure for lifting the main valve can be admitted only through the passage or restricted opening controlled by a throttling-plug 37.

The pine or passage at the bottom of the valve is connected by a to-and-from pipe 38 to the pilot valve casing 17.

The pilot valve may be of any ordinary or usual construction. For example, the pilot valve casing may be provided with a lining or inside pipe 40, and formed in the pilot valve casing may be a passage 41 con stituting, in effect, a continuation of the pipe 38. The pilot valve casing is also con nected through a passage 42 with the pressure chamber, and is also connected by a passage 43 with the exhaust or main outlet. The pilot valve stem is provided with the usual cup-packings or pistons which are arranged so that when the pilot valve is raised, pressure from the passage 42 will be admitted through passage 41 to the pipe 38. When the pilot valve is moved down the pipe 38 will be connected through passage 41 to the exhaust passage 43.

Referring now to Figs. 4 and 5 for a more complete description of how the operating piston acts to automatically control and shut oli' the central ports or openings so as to insure a flow of water through a restricted or throttled passage when the valve is mov ing back from either end of its travel to a normal central or stopping position, it will be seen from the arrows in Fig. 4, that so long as the operating piston 32 is above the inlet ports or passages 51, water will have a free admission to or from the annular space around the member 33, and as the cupshaped nature of the piston and annular shape of the yielding packing 32 permits the latter to yield outwardly when pressure is applied below so as to allow a free upward flow of water past the same, the water will fill the chamber inside of the thimble-shaped 1 of ports and proportions of parts can be piece 31, when the piston has moved to its upper limit. When, however, it is desired to move the controlling piston back from its lifted or raised position illustrated in Fig. 4 to its central or stopping position shown in Fig, 3, it will be seen that water will be trapped or contained within the chamber inside of the thimble-shaped piece 31, and owing to the cup-shaped nature of the packing 32, pressure from above will close the packing against the pipe and prevent a direct outward flow of water from this chamber, therefore the water can be exhausted and the valve permitted to close only so rapidly as the water will run down through the central pipe 84, as indicated by the dotted arrow in Fig. l. All this time the water between the pipe 33 and easing I?) has a free outlet through the ports 51 and 53. On the other hand, when the operating piston moves down below its central position,

the cup-shaped character of the packing will permit the water to be exhausted from the space below the piston, upwardly past said packing, as indicated by the arrows in Fig. 5, but when pressure is admitted to raise the operating piston and bring the main valve up to its stopping or central position (Fig. from a bottom position, as shown in Fig. 5, it will be seen that the cupshaped nature of the packing 32 will close andprevent the water from passing down around the pipe 33 and acting directly on the bottom side of the piston, and that pressure acting on the piston directly to raise the valve up to its central position can only be admitted through. the pipe or passage controlled by the throttle plug 57.

As a result of the entire operation of my elevator valve as thus constructed, it will be seen that I have provided a valve having very slow movements towards its central or normal position, the rate of centering movement from position at one side of the center being controlled by the throttle plug 35, and the rate of movement when returned to central position from the other side of the center being controlled by the throttle plug 37; but that the valve will be permitted to have an unrestrained or quick opening movement from either side of its central position.

In the use of a valve as thus constructed upon a'hydraulic elevator, the elevator can start quickly either up or down from a condition of rest, but after the car has started in motion in either direction, the controlling action of the operating piston of the main elevator valve will prevent any such sudden stoppages or reversals as would be liable to result in accident or injury of parts.

I am aware that many changes may be made in the details of the construction of my elevator valve, and that the arrangement [widely departed from by those who are skilled in the art without departing from the scope of my invention as expressed in the claims. I do not wish, therefore, to be limited to the particular form of valve I have herein shown and described, but

hat I do claim and desire to secure by Letters Patent of the United States is 1. In a valve of the class described, the combination of a main valve, an operating piston therefor, connections for admitting or exhausting pressure to shift the main valve through ports controlled by the operating piston, means for entrapping water in said operating piston, and a restricted passage for the discharge of water therefrom.

2. The combination of a main valve, an operating piston therefor, a pilot valve admitting and exhausting pressure to shift said operating piston, ports controlled by said operating piston through which the pressure controlled by the pilot valve is adapted to pass, means for entrapping water in said operating piston, and restricted passages for the admission and passage of water to and from said last named means.

3. In a valve of the class described, the combination of a. main valve, an ope 'ating piston therefor, ports or passages controlled by said operating piston, connections for supplying and exhausting pressure through said ports or passages to shift the operating piston, said ports or passages being located at the central point of the travel of the piston, means for entrapping water when the piston moves to the end of its stroke, and restricted passages through which said water may be discharged.

4t. The combination of a main valve, an operating piston therefor, ports or passages located at the central point of the travel of the operating piston, and controlled thereby, a pilot 'alvc supplying and exhausting pressure through said ports or passages to shift said operating piston, means for eutrapping water when the operating piston moves to the end of its stroke, and passages for the escape of water therefrom.

In a valve of the class described, the combination of a main valve, an operating thimble connected to move the main valve stem, and having an operating piston, an annular cup packing thereon a central guide pipe on which the operating piston runs, a restricted passage for exhausting the water from the operating thimble, and a restricted passage for admitting pressure to act upon the operating piston.

6. In a valve of the class described, the

combination of a main valve, an operating thimble connected to shift the main valve and having an operating piston, an annular cup packing thereon a central pipe on which the operating piston runs, restricted passages and a pilot valve controlling the exhaustion of water from the operatin thimble through. a restricted passage and controlling the admission of pressure to act on the annular piston through another restricted passage.

'7. In a valve of the class described, the combination of a main valve, an operating thimble having an operating piston, a guidepipe on which said piston runs, said guide pipe having a transverse partition and re stricted tube for exhausting the water from the operating thimble with ports or passages from the annular space around the exhaust tube controlled by the operating piston, throttle-plugs controlling the admission of pressure acting on the operating piston and the discharge of water from the exhaust tube, and a pilot valve for admitting and exhausting pressure to operate the main valve.

8. In a valve of the class described, the combination of a main valve, an operating thimble shaped piston having a cup-shaped annular packing, and a guide-pipe on which said piston runs, said guide pipe having a. transverse partition and restricted tube for exhausting the water from the operating piston with ports or passages from the annular space around the exhaust tube controlled by the operating piston.

9. In a device of the class described, the combination of a cylinder, a ringshaped piston therein having a chamber, a valve connected with said piston a guide pipe loosely fitting in the piston and adapted to enter said chamber when the piston moves over the pipe, said pipe having ports located substantially centrally with respect to the travel of the end of the piston, also having unrestricted passages for the water entering or leaving said ports, and a restricted outlet for water from said chamber, and an annular cup packing on the piston adapted to close against the pipe when pressure is admitted between the pipe and piston from one side and to open with the pressure when admitted from the other direction.

10. In a device of the class described, the combination of a hollow ring shaped piston, a valve connected with said piston a guide for the piston fitting loosely therein and having a passage and ports communicating with the interior of said passage and an annular cup-shaped packing on the piston adapted to close against the guide under the influence of pressure from one side and to open under the influence of pressure from the other to let water through.

11. In a device of the class described, the combination of a hollow ring-shaped piston, a valve connected with said piston a guide for the piston fitting loosely therein and having a passage and ports communicating with said passage through the walls of the guide, ports communicating with said passage, means comprising a passage for exhausting liquid from the interior of said passage and an annular cup shaped packing on the piston adapted to close against the guide under the influence of pressure from one side and to open under the influence of pressure from the other to let water through, said piston having an annular enlargement at its end for receiving the end of said packing when open.

12. In a device of the class described, the combination of a hollow ring-shaped piston, a valve connected with said piston a guide for the piston loosely fitting therein and having an unrestricted passage, ports communicating with said passage through the walls of the guide and a restricted passage opening from the end of the guide into the hollow piston, with an annular cup-shaped packing on the piston adapted to close against the guide under the influence of pressure from within the piston, and to open under the influence of pressure from the end of the piston, where by the piston may be started rapidly in either direction from a central position, but its mo tion toward the central position from either end will be retarded.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

ANDREWV R. KLINGLOFF.

Witnesses NATHAN HEARD, W. H. TEBEAU.

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