US3211852A - Hydraulic operating mechanism - Google Patents

Hydraulic operating mechanism Download PDF

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US3211852A
US3211852A US212976A US21297662A US3211852A US 3211852 A US3211852 A US 3211852A US 212976 A US212976 A US 212976A US 21297662 A US21297662 A US 21297662A US 3211852 A US3211852 A US 3211852A
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Prior art keywords
valve
inlet
control valve
operating piston
fluid
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US212976A
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Burmester Henry
Duffing Monika
Duffing Hildegard
Duffing Lutz
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Siemens Schuckertwerke AG
Siemens AG
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Siemens AG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
    • H01H33/02—Details
    • H01H33/28—Power arrangements internal to the switch for operating the driving mechanism
    • H01H33/30—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator
    • H01H33/34—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator hydraulic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20507—Type of prime mover
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/21—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge
    • F15B2211/212—Systems with pressure sources other than pumps, e.g. with a pyrotechnical charge the pressure sources being accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F15B2211/30515—Load holding valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/321—Directional control characterised by the type of actuation mechanically
    • F15B2211/325—Directional control characterised by the type of actuation mechanically actuated by an output member of the circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/32—Directional control characterised by the type of actuation
    • F15B2211/327—Directional control characterised by the type of actuation electrically or electronically

Definitions

  • HYDRAULIC OPERATING MECHANISM Filed July 27, 1962 United States Patent 3,211,852 HYDRAULIC OPERATING MECHANISM Henry Bnrmester, Berlin-Mariendorf, and Paul Duffing,
  • This invention relates to hydraulic operating mechanisms in general and, more particularly to hydraulic operating mechanisms in which it is desired to retain the operating parts at an end position regardless of leakage of the inlet valves.
  • a general object of the present invention is the provision of an improved hydraulic operating mechanism in which leakage of the inlet valves will not cause the operation mechanism to move to an opposite end position after the mechanism has once reached a first position.
  • a further object of the present invention is the provision of an improved hydraulic operating mechanism particularly adapted for circuit breaker use in which after the contact structure has either reached the open or the closed circuit position, it is desirable to retain the contact structure in the said position regardless of any leakage of the inlet valves.
  • Still a further object of the present invention is the provision of an improved simplified type hydraulic operating mechanism in which a control slide valve is interposed between the inlet valves and the operating piston to assure that the operating piston will remain at one of its two end positions regardless of any leakage of the inlet valves.
  • FIGS. 1A and 1B collectively illustrate an application of the invention to a circuit breaker, the contact structure being illustrated in the open circuit position.
  • the reference numeral 1 generally designates a hydraulic operating mechanism including an accumulator 2, inlet valve structure 3, a control slide valve 5, an operating piston 6 and a sump 7.
  • the operating piston 6 has a piston rod 6a associated therewith, which is linked, as at 9, to a floating link 10 which operates a bell crank 11.
  • the operating bell crank 11 is pivotally mounted upon a stationary bracket 12 and has an operating arm 13 associated therewith which effects the opening and closing movement of a bridging contact 15.
  • the bridging contact 15 makes separable engagement with a spaced pair of stationary contacts 16 which control an electrical circuit L L With reference to FIG.
  • a pressure switch 17 is provided to control the pressure within the high pressure accumulator 2 and to effect energization of a compressor 18 which serves to withdraw fluid, such as oil, through a pipe line 20 from the 3,211,852 Patented Oct. 12, 1965 sump 7 and compress it to the requisite high value through a check valve 21.
  • a compressor 18 which serves to withdraw fluid, such as oil, through a pipe line 20 from the 3,211,852 Patented Oct. 12, 1965 sump 7 and compress it to the requisite high value through a check valve 21.
  • fluid such as oil
  • a pair of inlet valves 22, 23 are provided having valve stems 22a, 23a respectively.
  • the outer ends of the valve stems 22a, 23a may be engaged, in abutting fashion, by pivotally mounted actuating levers 24, 25 which are pivotally mounted upon stationary brackets 26, 27.
  • Toeffect operative rotation of the actuating levers 24, 25 there may be provided electromagnetic means, assuming in the illustrated form of the invention an opening solenoid 28 and a closing solenoid 29.
  • both sides thereof have fluid passages 30, 31 leading respectively to inlet chambers 32, 33 which may be in communication with a sump pipe line 34, 35 or with a high pressure inlet region 36.
  • the high pressure inlet region 36 associated with the control slide valve 5, is in constant communication with an inlet manifold 37 which is supplied with high pressure hydraulic fluid 19 through opening of either of the inlet valves 22 or 23.
  • control slide valve 5 has piston rod portions 5a, 5b which are pivotally connected, as at 50, 5d, with the lower extremities 24a, 25a of the actuating levers 24, 25.
  • control slide valve 5 has substantially equal-diameter valve spools 5e and 5 with the inlet region 36 between the equal-diameter valve spools 5e and 5f.
  • Fluid-passage means 4 comprising the inlet manifold 37, the inlet region 36, and the fluid passages 30, 31, hydraulically interconnect the inlet valves 22, 23 with both sides of the operating piston 6.
  • the control valve 5 is interposed in said fluidpassage means 4 between the inlet valves 22, 23 and the operating piston 6, with the inlet region 36 in constant communication with the fluid-passage means 4.
  • the operating piston 6 has an actuating arm 40 secured to and movable therewith by means of the piston rod 6a. Also an additional arm 41 is secured to and movable with the operating piston 6 by means of an additional piston rod 6b.
  • sump-passage means 8 comprising the sump pipe lines 34, 35, is connected to the ends of the control valve 5 to the outer faces of the equal-diameter valve spools 52, 5f.
  • Linkage means 14, comprising in the particular embodiment shown, the actuating levers 24, 25, interconnects the control valve 5 with the inlet valves 22, 23, whereby motion of the control valve 5 effects opening of the inlet valves 22, 23, as more fully described hereinafter.
  • the improved hydraulic operating mechanism 1 functions in the following manner: When it is desired to move the circuit breaker contacts 15 to the open circuit position, the control slide valve 5 is moved to the corresponding position, either manually, or by electromagnetic means, as shown by energization of the opening solenoid 28. This will connect the fluid passage 31 to the inlet chamber 33 and will connect the inlet chamber 32 with the sump pipe line 34. In addition, the counterclockwise rotation of the actuating lever 25 will effect throught the valve stem 23a opening of the inlet valve 23 to permit high pressure oil 19 to flow from the accumulator 2 into the high pressure region 36 and through the fluid passage 31 to act upon the right-hand face of the operating piston 6 to move the same in a leftward direction and effect opening of the contact struc ture 15, 16.
  • the closing solenoid 29 may be energized. This will mechanically force the actuating arm 24 in a clockwise direction about its pivot to forcibly bring the control piston 5 to the leftward position thereof, not shown, to open up the fluid passage 30 with the high pressure region 36 and correspondingly effect opening of the inlet valve 22.
  • the opening of the inlet Valve 22 will permit high pressure hydraulic fluid 19 from the accumulator 2 to pass through the high pressure inlet manifold 37, through the high pressure space 36 and through the fluid passage 30 to act upon the left-hand face of the operating piston 6 to effect closing of the contacts 15, 16.
  • the actuating arm 41 will strike the extremity of the piston stem 5a and forcibly cause counterclockwise rotative movement of the arm 24 to release the valve stem 22a and thereby effect closure of the inlet valve 22.
  • control slide valve 5 interposed between the inlet valves 22, 23 and the working piston 6 regardless of anyleakage of the inlet valves 22, 23 the disposition of the control valve 5 will be such as to constantly apply any pressure upon the proper face of the working piston 6 to maintain the piston 6 in its end position.
  • the initiating means 46 for initiating operation of the hydraulic drive 1, may comprise the electromagnetic solenoid 28, 29 shown in FIG. 1A, or manual means (not shown), and effects motion of the control valve 5 to set into operation the sequence of events to result in the movement of the operating piston 6 to either one of its two operating positions.
  • enlarged portions 60, 6d may be provided cooperating with restrictions 44, 45 to effect dashpot action at the ends of the travel of the operating piston 6.
  • a hydraulic drive including at least one inlet valve and an operating piston, fluid-passage means interconnecting the inlet valve with both sides of the operating piston, a control valve with equal-diameter valve spools having an inlet region between said equal-diameter valve spools in constant communication with said fluid-passage means said control valve interposed in said fluid-passage means between said one inlet valve and the operating piston, sump-passage means connected to the ends of the control valve to the outer faces of said equal-diameter valve spools, linkage means interconnecting said control valve with said one inlet valve, whereby motion of said control valve effects opening of said inlet valve, and means initiating movement of the hydraulic drive by effecting motion of said control valve.
  • a hydraulic drive including a pair of inlet valves and an operating piston, fluid-passage means interconnecting the inlet valves with both sides of the operating piston, a control valve with equal-diameter valve spools having an inlet region between said equal-diameter valve spools in constant communication with said fluid passage means, said control valve interposed in said fluid passage means between said inlet valves and the operating piston, sump-passage means connected to the ends of the control valve to the outer faces of said equal-diameter valve spools, linkage means interconnecting said control valve with said inlet valves, whereby motion of said control valve effects opening of said inlet valves, and means initiating movement of the hydraulic drive by effecting motion of said control valve.
  • a hydraulically-operated circuit breaker including separable contact means, a hydraulic drive for the circuit breaker including at least one inlet valve and an operating piston, means connecting the operating piston to the separable contact means to effect opening and closing movement thereof, fluid passage means interconnecting the inlet valve with both sides of the operating piston, a control valve with a equal-diameter valve spools having an inlet region between said equal-diameter valve spools in constant communication with said fluid passage means, said control valve interposed in said fluid passage means between said one inlet valve and the operating piston, sump passage means connected to the ends of the control valve to the outer faces of said equal-diameter valve spools, linkage means interconnecting said control valve with said one inlet valve, whereby motion of said control valve effects opening of said inlet valve, and means initiating movement of the hydraulic drive by effecting motion of said control valve.
  • a hydraulic drive including at least one inlet valve and an operating piston, fluid-passage means interconnecting the inlet valve with both sides of the operating piston, a control valve with equal-diameter valve spools having an inlet region between said equal-diameter valve spools in constant communication with said fluid passage means, said control valve interposed in said fluid-passage means between said one inlet valve and the operating piston, sump passage means connected to the ends of the control valve to the outer faces of said equal-diameter valve spools, linkage means interconnecting said control valve with said one inlet valve, whereby motion of said control valve effects opening of said inlet valve, means initiating movement of the hydraulic drive by effecting motion of said control valve, and means movable in response to motion of said operating piston to effect closure of'said one inlet valve.
  • a hydraulically-operated circuit breaker including separable contact means, a hydraulic drive for said circuit breaker including at least one inlet valve and an operating piston, means connecting the operating piston to the separable contact means to efiect opening and closing movement thereof, fluid-passage means interconnecting the inlet valve with both sides of the operating piston, a control valve with equal-diameter valve spools having an inlet region between said equal-diameter valve spools in constant communication with said fluid passage means, said control valve interposed in said fluid-passage means between said one inlet valve and the operating piston, sump passage means connected to the ends of the control valve to the outer faces of said equal-diameter valve spools, linkage means interconnecting said control valve with said one inlet valve, whereby motion of said control valve effects opening of said inlet valve, means initiating References Cited by the Examiner UNITED STATES PATENTS 2,523,572 9/50 Jansson 200-82 2,730,589 1/56 Perry e

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Fluid-Driven Valves (AREA)

Description

Oct. 12, 1965 H. BURMESTER ETAL 3,211,852
HYDRAULIC OPERATING MECHANISM Filed July 27, 1962 United States Patent 3,211,852 HYDRAULIC OPERATING MECHANISM Henry Bnrmester, Berlin-Mariendorf, and Paul Duffing,
deceased, late of Eerlin-Siemenstadt, Germany, by Monika Dufling and Hildegard Dufiing, Berlin-Siemenstadt, and Lutz Dufling, Wuppertal-Barmen, Germany, heirs, assignors to Siemens Schuckertwerlre Alrtiengesellschaft, Erlangen, Germany, a corporation of Germany Filed July 27, 1962, Ser. No. 212,976
Claims priority, application Germany, July 27, 1961 5 Claims. (Cl. 200-82) This invention relates to hydraulic operating mechanisms in general and, more particularly to hydraulic operating mechanisms in which it is desired to retain the operating parts at an end position regardless of leakage of the inlet valves.
A general object of the present invention is the provision of an improved hydraulic operating mechanism in which leakage of the inlet valves will not cause the operation mechanism to move to an opposite end position after the mechanism has once reached a first position.
A further object of the present invention is the provision of an improved hydraulic operating mechanism particularly adapted for circuit breaker use in which after the contact structure has either reached the open or the closed circuit position, it is desirable to retain the contact structure in the said position regardless of any leakage of the inlet valves.
Still a further object of the present invention is the provision of an improved simplified type hydraulic operating mechanism in which a control slide valve is interposed between the inlet valves and the operating piston to assure that the operating piston will remain at one of its two end positions regardless of any leakage of the inlet valves.
Although the invention will be particularly described as applied to a high voltage circuit interrupter, it will be apparent to those skilled in the art that the improved hydraulic drive of the present invention may be readily applied to other applications, other than circuit breaker use, wherein it is desired to retain the operating parts at one of two end positions regardless of any leakage of the inlet valves.
Further objects and advantages will readily become apparent upon reading the following specification, taken in conjunction with the drawing, in which:
FIGS. 1A and 1B collectively illustrate an application of the invention to a circuit breaker, the contact structure being illustrated in the open circuit position.
Referring to the drawing, and more particularly to FIGS. 1A and 1B thereof, the reference numeral 1 generally designates a hydraulic operating mechanism including an accumulator 2, inlet valve structure 3, a control slide valve 5, an operating piston 6 and a sump 7. As shown, the operating piston 6 has a piston rod 6a associated therewith, which is linked, as at 9, to a floating link 10 which operates a bell crank 11. As shown in FIG. 1B, the operating bell crank 11 is pivotally mounted upon a stationary bracket 12 and has an operating arm 13 associated therewith which effects the opening and closing movement of a bridging contact 15. The bridging contact 15 makes separable engagement with a spaced pair of stationary contacts 16 which control an electrical circuit L L With reference to FIG. 1A, it will be noted that a pressure switch 17 is provided to control the pressure within the high pressure accumulator 2 and to effect energization of a compressor 18 which serves to withdraw fluid, such as oil, through a pipe line 20 from the 3,211,852 Patented Oct. 12, 1965 sump 7 and compress it to the requisite high value through a check valve 21. Preferably there is not provided any gaseous region interiorly of the high pressure accumulator tank 2, and reliance is placed upon storing energy in the form of high-pressure hydraulic fluid, such as the oil 19.
A pair of inlet valves 22, 23 are provided having valve stems 22a, 23a respectively. The outer ends of the valve stems 22a, 23a may be engaged, in abutting fashion, by pivotally mounted actuating levers 24, 25 which are pivotally mounted upon stationary brackets 26, 27. Toeffect operative rotation of the actuating levers 24, 25 there may be provided electromagnetic means, assuming in the illustrated form of the invention an opening solenoid 28 and a closing solenoid 29. Thus, as more fully described hereinafter, energization of the opening solenoid 28 will effect through rotation of the actuating arm 25 opening of the inlet valve 23 and movement of the control slide valve 5 to the desired position to effect opening movement of the operating piston 6. Similarly, energization of the closing solenoid 29 will cause suitable rotation of the actuating lever 24 to effect opening of the inlet valve 22 and positioning of the control slide valve 5 to the proper position to effect rightward movement of the operating piston 6 and consequent closing of the bridging contact 15 into engagement with the stationary contacts 16.
It will be noted in connection with the operating piston 6 that both sides thereof have fluid passages 30, 31 leading respectively to inlet chambers 32, 33 which may be in communication with a sump pipe line 34, 35 or with a high pressure inlet region 36. The high pressure inlet region 36, associated with the control slide valve 5, is in constant communication with an inlet manifold 37 which is supplied with high pressure hydraulic fluid 19 through opening of either of the inlet valves 22 or 23.
It will be observed that the control slide valve 5 has piston rod portions 5a, 5b which are pivotally connected, as at 50, 5d, with the lower extremities 24a, 25a of the actuating levers 24, 25. In addition, the control slide valve 5 has substantially equal- diameter valve spools 5e and 5 with the inlet region 36 between the equal- diameter valve spools 5e and 5f. Fluid-passage means 4, comprising the inlet manifold 37, the inlet region 36, and the fluid passages 30, 31, hydraulically interconnect the inlet valves 22, 23 with both sides of the operating piston 6. The control valve 5 is interposed in said fluidpassage means 4 between the inlet valves 22, 23 and the operating piston 6, with the inlet region 36 in constant communication with the fluid-passage means 4.
It will also be noted that the operating piston 6 has an actuating arm 40 secured to and movable therewith by means of the piston rod 6a. Also an additional arm 41 is secured to and movable with the operating piston 6 by means of an additional piston rod 6b.
As shown in FIG. 1A, sump-passage means 8, comprising the sump pipe lines 34, 35, is connected to the ends of the control valve 5 to the outer faces of the equal-diameter valve spools 52, 5f. Linkage means 14, comprising in the particular embodiment shown, the actuating levers 24, 25, interconnects the control valve 5 with the inlet valves 22, 23, whereby motion of the control valve 5 effects opening of the inlet valves 22, 23, as more fully described hereinafter.
The improved hydraulic operating mechanism 1 functions in the following manner: When it is desired to move the circuit breaker contacts 15 to the open circuit position, the control slide valve 5 is moved to the corresponding position, either manually, or by electromagnetic means, as shown by energization of the opening solenoid 28. This will connect the fluid passage 31 to the inlet chamber 33 and will connect the inlet chamber 32 with the sump pipe line 34. In addition, the counterclockwise rotation of the actuating lever 25 will effect throught the valve stem 23a opening of the inlet valve 23 to permit high pressure oil 19 to flow from the accumulator 2 into the high pressure region 36 and through the fluid passage 31 to act upon the right-hand face of the operating piston 6 to move the same in a leftward direction and effect opening of the contact struc ture 15, 16.
At the extreme end of the opening stroke of the operating piston 6, the actuating arm 40 movable therewith will strike the right-hand end of the control valve piston 5b and move the upper arm 25b away from the extremity of the valve piston 23a and permit the closing of the inlet valve 23. In this fully open circuit position of the interrupter it will be observed that should either of the valves 22, 23 leak, nevertheless the leakage of the high pressure oil will continue to act through the fluid passage 31 and on the right-hand face of the operating piston 6 to assure that the operating piston 6 will remain in its fully open circuit position regardless of any leakage of the control valves 22, 23.
To effect the closing operation of the circuit breaker contacts 15, 16 the closing solenoid 29 may be energized. This will mechanically force the actuating arm 24 in a clockwise direction about its pivot to forcibly bring the control piston 5 to the leftward position thereof, not shown, to open up the fluid passage 30 with the high pressure region 36 and correspondingly effect opening of the inlet valve 22. The opening of the inlet Valve 22 will permit high pressure hydraulic fluid 19 from the accumulator 2 to pass through the high pressure inlet manifold 37, through the high pressure space 36 and through the fluid passage 30 to act upon the left-hand face of the operating piston 6 to effect closing of the contacts 15, 16. At the extreme right-hand end of the travel of the operating piston 6 the actuating arm 41 will strike the extremity of the piston stem 5a and forcibly cause counterclockwise rotative movement of the arm 24 to release the valve stem 22a and thereby effect closure of the inlet valve 22.
From the foregoing description of the invention it will be apparent that by the provision of the control slide valve 5 interposed between the inlet valves 22, 23 and the working piston 6 regardless of anyleakage of the inlet valves 22, 23 the disposition of the control valve 5 will be such as to constantly apply any pressure upon the proper face of the working piston 6 to maintain the piston 6 in its end position.
It will be apparent that for certain applications the electromagnetic solenoids 28, 29 may be omitted and merely a manual operation of the actuating levers 24 ,25 resorted to.
' In other words, the initiating means 46, for initiating operation of the hydraulic drive 1, may comprise the electromagnetic solenoid 28, 29 shown in FIG. 1A, or manual means (not shown), and effects motion of the control valve 5 to set into operation the sequence of events to result in the movement of the operating piston 6 to either one of its two operating positions.
In addition, although there has been described two valves 22, 23 in a particular construction shown, nevertheless a single valve may be sufficient because in effect the two valves 22, 23 are arranged in parallel. In such an eventuality, that is using a single valve, there must be a provision made to the effect that this single valve may be closed at the end position of the operating piston 6.
To provide a dashpot action toward the end of the movements of the operating piston 6 preferably enlarged portions 60, 6d may be provided cooperating with restrictions 44, 45 to effect dashpot action at the ends of the travel of the operating piston 6.
Although there has been illustrated and described a specific structure, it is to be clearly understood that the same was merely for the purpose of illustration, and that changes and modifications may readily be made therein by those skilled in the art without departing from the spirit and scope of the invention.
We claim as our invention:
1. A hydraulic drive including at least one inlet valve and an operating piston, fluid-passage means interconnecting the inlet valve with both sides of the operating piston, a control valve with equal-diameter valve spools having an inlet region between said equal-diameter valve spools in constant communication with said fluid-passage means said control valve interposed in said fluid-passage means between said one inlet valve and the operating piston, sump-passage means connected to the ends of the control valve to the outer faces of said equal-diameter valve spools, linkage means interconnecting said control valve with said one inlet valve, whereby motion of said control valve effects opening of said inlet valve, and means initiating movement of the hydraulic drive by effecting motion of said control valve.
2. A hydraulic drive including a pair of inlet valves and an operating piston, fluid-passage means interconnecting the inlet valves with both sides of the operating piston, a control valve with equal-diameter valve spools having an inlet region between said equal-diameter valve spools in constant communication with said fluid passage means, said control valve interposed in said fluid passage means between said inlet valves and the operating piston, sump-passage means connected to the ends of the control valve to the outer faces of said equal-diameter valve spools, linkage means interconnecting said control valve with said inlet valves, whereby motion of said control valve effects opening of said inlet valves, and means initiating movement of the hydraulic drive by effecting motion of said control valve.
3. A hydraulically-operated circuit breaker including separable contact means, a hydraulic drive for the circuit breaker including at least one inlet valve and an operating piston, means connecting the operating piston to the separable contact means to effect opening and closing movement thereof, fluid passage means interconnecting the inlet valve with both sides of the operating piston, a control valve with a equal-diameter valve spools having an inlet region between said equal-diameter valve spools in constant communication with said fluid passage means, said control valve interposed in said fluid passage means between said one inlet valve and the operating piston, sump passage means connected to the ends of the control valve to the outer faces of said equal-diameter valve spools, linkage means interconnecting said control valve with said one inlet valve, whereby motion of said control valve effects opening of said inlet valve, and means initiating movement of the hydraulic drive by effecting motion of said control valve.
4. A hydraulic drive including at least one inlet valve and an operating piston, fluid-passage means interconnecting the inlet valve with both sides of the operating piston, a control valve with equal-diameter valve spools having an inlet region between said equal-diameter valve spools in constant communication with said fluid passage means, said control valve interposed in said fluid-passage means between said one inlet valve and the operating piston, sump passage means connected to the ends of the control valve to the outer faces of said equal-diameter valve spools, linkage means interconnecting said control valve with said one inlet valve, whereby motion of said control valve effects opening of said inlet valve, means initiating movement of the hydraulic drive by effecting motion of said control valve, and means movable in response to motion of said operating piston to effect closure of'said one inlet valve.
5. A hydraulically-operated circuit breaker including separable contact means, a hydraulic drive for said circuit breaker including at least one inlet valve and an operating piston, means connecting the operating piston to the separable contact means to efiect opening and closing movement thereof, fluid-passage means interconnecting the inlet valve with both sides of the operating piston, a control valve with equal-diameter valve spools having an inlet region between said equal-diameter valve spools in constant communication with said fluid passage means, said control valve interposed in said fluid-passage means between said one inlet valve and the operating piston, sump passage means connected to the ends of the control valve to the outer faces of said equal-diameter valve spools, linkage means interconnecting said control valve with said one inlet valve, whereby motion of said control valve effects opening of said inlet valve, means initiating References Cited by the Examiner UNITED STATES PATENTS 2,523,572 9/50 Jansson 200-82 2,730,589 1/56 Perry et a]. 20082 2,736,295 2/56 Peek ZOO-82 2,920,170 1/60 Caswell 200-82 BERNARD A. GILHEANY, Primary Examiner.

Claims (1)

1. A HYDRAULIC DRIVE INCLUDING AT LEAST ONE INLET VALVE AND AN OPERATING PISTON, FLUID-PASSAGE MEANS INTERCONNECTING THE INLET VALVE WITH BOTH SIDES OF THE OPERATING PISTON, A CONTROL VALVE WITH EQUAL-DIAMETER VALVE SPOOLS HAVING AN INLET REGION BETWEEN SAID EQUAL-DIAMETER VALVE SPOOLS IN CONSTANT COMMUNICATION WITH SAID FLUID-PASSAGE MEANS SAID CONTROL VALVE INTERPOSED IN SAID FLUID-PASSAGE MEANS BETWEEN SAID ONE INLET VALVE AND THE OPERATING PISTON, SUMP-PASSAGE MEANS CONNECED TO THE ENDS OF THE CONTROL VALVE TO THE OUTER FACES OF SAID EQUAL-DIAMETER VALVE SPOOLS, LINKAGE MEANS INTERCONNECTING SAID CONTROL VALVE WITH SAID ONE INLET VALVE, WHEREBY MOTION OF SAID CONTROL VALVE EFFECTS OPENING OF SAID INLET VALVE, AND MEANS INITIATING MOVEMENT OF THE HYDRAULIC DRIVE BY EFFECTING MOTION OF SAID CONTROL VALVE.
US212976A 1961-07-27 1962-07-27 Hydraulic operating mechanism Expired - Lifetime US3211852A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3044675A1 (en) * 1980-11-27 1982-07-08 Leybold-Heraeus GmbH, 5000 Köln METHOD FOR CONTROLLING A HYDRAULIC DRIVE AND HYDRAULIC DRIVE SUITABLE FOR CARRYING OUT THIS CONTROL METHOD

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523572A (en) * 1944-03-18 1950-09-26 Allis Chalmers Mfg Co Control for a plurality of fluid pressure motors
US2730589A (en) * 1953-01-13 1956-01-10 Allis Chalmers Mfg Co Circuit breaker with hydraulic motor controlled by main and pilot valves
US2736295A (en) * 1953-01-23 1956-02-28 Allis Chalmers Mfg Co Circuit breaker with fluid motor having fluid admission varied during stroke
US2920170A (en) * 1957-10-11 1960-01-05 I T E Circnit Breaker Company Pneumatically operated circuit breaker having pneumatically assisted arc interrupting means

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2523572A (en) * 1944-03-18 1950-09-26 Allis Chalmers Mfg Co Control for a plurality of fluid pressure motors
US2730589A (en) * 1953-01-13 1956-01-10 Allis Chalmers Mfg Co Circuit breaker with hydraulic motor controlled by main and pilot valves
US2736295A (en) * 1953-01-23 1956-02-28 Allis Chalmers Mfg Co Circuit breaker with fluid motor having fluid admission varied during stroke
US2920170A (en) * 1957-10-11 1960-01-05 I T E Circnit Breaker Company Pneumatically operated circuit breaker having pneumatically assisted arc interrupting means

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