US2650572A - Pneumatic drive and damping device therefor - Google Patents

Pneumatic drive and damping device therefor Download PDF

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Publication number
US2650572A
US2650572A US103648A US10364849A US2650572A US 2650572 A US2650572 A US 2650572A US 103648 A US103648 A US 103648A US 10364849 A US10364849 A US 10364849A US 2650572 A US2650572 A US 2650572A
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United States
Prior art keywords
piston
buffer
cylinder
power
pneumatic drive
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Expired - Lifetime
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US103648A
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English (en)
Inventor
Amstutz Arnold
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BBC Brown Boveri AG Switzerland
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Bbc Brown Boveri & Cie
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/60—Mechanical arrangements for preventing or damping vibration or shock
    • H01H3/605—Mechanical arrangements for preventing or damping vibration or shock making use of a fluid damper
    • 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
    • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/20—Other details, e.g. assembly with regulating devices
    • F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
    • 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
    • H01H33/32—Power arrangements internal to the switch for operating the driving mechanism using fluid actuator pneumatic

Definitions

  • the present invention relates to pneumatic drives for acceleration of masses in which the driving force is applied to the mass by a pneumatically operated piston, and movement of the mass is opposed by a counter loading force applied thereto in the form of a spring or weight.
  • a correspondingly large amount of energy must be absorbed in slowing down the moving system towards the end of the stroke.
  • Buffer pistons actuated by the power piston have been employed to absorb the energy after a predetermined undamped travel of the power piston but in none of the prior known arrangements has it been possible to eliminate oscillations in the moving system towards the end of the path travelled by the mass. These oscillations can prove quite harmful in many applications and particularly so when the mass under consideration is constituted by the movable contact of a compressed gas electrical power switch and oscillation of the contact causes it to bounce with respect to the stationary contact.
  • the objective of the present invention is to provide an improved pneumatic drive and buffer arrangement which is practically free from oscillation.
  • motion of the bufier piston is opposed by the pressure of the compressed gas applied against one side thereof. After the undamped portion of the path has been travelled by the power piston, the latter engages the other side of the buffer piston moving the same against the pressure of the compressed gas which is decreased at a uniform rate by bleeding the air to the opposite side of the buffer piston, thus bringing the mass to rest at the end of the stroke'when the pressures on the opposite faces of the buffer piston have become equalized.
  • FIG. 1 is a vertical section one embodiment of the improved pneumatic drive and buffer system with the operating components shown in the positions occupied at the beginning of the stroke;
  • Fig. 2 is a fragmentary vertical section showing the operating components at the end of the stroke
  • Fig. 3 is a vertical section of a pneumatic drive illustrating a modified embodiment of the invention
  • e Fig. 4 is a view similar to Fig.2 showing the operating components of Fig. 3 at an intermediate point in the stroke.
  • the pneumatic drive is comprised of a power cylinder 13 having vents I4 at the upper end thereof leading to atmosphere, a power piston 15 slidable within cylinder 13 and including an upper section 15a of reduced diameter, and a piston rod l6 extending upwardly through a buffer or brake cylinder ll located atop the power cylinder l3 and coupled to the mass l2.
  • the buffer piston [8 in cylinder I! includes a central aperture I80. large enough to permit free, sliding movement of the piston rod 16 and a small passageway lBb, leading from one face thereof to the other to permit the air pressures on both sides of the piston to become equalized during the braking action of the moving system.
  • a compressed gas such as air for operating the drive is supplied through a conduit [9 having one branch l9a in communication with the lower end of power cylinder l3 below piston I5 and another branch l9b in communication with the upper end of buffer cylinder I! above buiier piston I 8.
  • the upper end wall I3a of the power cylinder I3 is provided with a central aperture [3b large enough to pass the reduced diameter portion 15a so that the latter will engage and apply an upward force against the buffer piston I 8 after moving through the dis tance a.
  • the stroke of the butter piston is indi cated by B in Fig. 2.
  • the modified construction illustrated in Figs. 3 and 4 operates on basically the same principle as that illustrated in Figs. 1 and 2 but provides for an additional controlled displacement of the mass following a slight pause at the close of the buffer phase of the operating stroke.
  • the buffer cylinder 2! is divided into upper and lower chambers Zia, 2H) by a first buffer piston 22 which seats upon a shoulder portion 2 of cylinder 2i.
  • Piston 22 is itself formed as a cylinder and contains a second buffer piston 23. The latter corresponds in function to buffer piston IS in the Figs. 1-2 construction and is provided with an aperture 23a leading from one side of the same to the other.
  • the power piston 24 and cylinder 25 are arranged in generally the same manner as in Figs.
  • Fig. 4 shows the parts in this intermediate position in the stroke. All during the above sequence of events, the pressure gas will have been gradually flowing through throttle valve 2'! into the lower buffer chamber Zib and this valve is so set that the gas pressure in chamber 2lbwill still be less than that in the two upper chambers 2m and 28 at the time the latter becomes equalized and the parts have been brought temporarily to rest.
  • a pneumatic drive comprising a power cylinder, apower piston slidable within said cylin- --de'r,"a buffer cylinder, a buffer piston slidable within said bufier cylinder and engaged by said power piston following a predetermined undamped travel of the latter, and conduit means foradmitting compressed gas from the same source to said power and buffer cylinders at one side of the pistons therein, the compressed gas in said buii'ercylinder establishing a force on said bufier-piston-opposing movement of said power piston upon engagement therewith, and said bufier piston including throttle means effective upon initial displacement of said buffer piston by said power piston to initiate transfer of said con pressed gas at a controlled ratefrom theside thereof on which said gas is admitted to the opposite side thereof upon continued displacement of said buffer piston by said power piston thereby providing a damping force on said power piston having a progressively decreasing character- .istic, thepressures on opposite sides of said buffer piston being equalized at the end of its stroke.
  • a pneumatic drive comprising a power cylinder, a power pistonslidable within said cylinder, a buffer cylinder disposed adjacent an end wall of said power cylinder, a buffer piston slidable within said buffer cylinder, said end wall including an aperture therethrough and said power piston including aportion of reduced diameter adapted to extend through said aperture into said buffer cylinder and engage the adjacent side of said bufier piston following a. predetermined undamped travel thereof, means for admitting compressed gas into said power cylinder at the end opposite said apertured end wall and into said buffer cylinder at the side or" said bufier piston opposite to that engaged by the reduced portion of said power cylinder from a common source of compressedgas and said buiier.
  • throttle means efiective upon initial displacement of said buffer piston by said power piston to initiate a controlled rate of transfer of the compressed gas from the side thereof on which said gas is admitted to the opposite side thereof upon continued displacement of said buffer piston by said power piston thereby providing a damping force on said power piston having a progressively decreasing characteristic, the pressures onopposite sides of said buffer piston being equalized at theend of its stroke.
  • a pneumatic drive comprising a power cylinder, a power piston slidable within said cylinder, a buffer cylinder disposed adjacent an end wall of said power cylinder," a first bu'fi'er' piston slidable in said buffer cylinder and which occupies a position of rest intermediate the ends thereof, a second buffer piston slidable within said first bufier piston, said power piston including a pair of progressively stepped portions of reduced diameter adapted to extend through central apertures provided respectively in said end Wall and first buffer piston to engage said second and first buffer pistons in succession following a predetermined undamped travel of said power piston, a main compressed gas supply conduit, branch conduits leading therefrom in parallel to said power cylinder at the end opposite said apertured end Wall and to said buffer cylinder on the side of said second bufier piston opposite to that engaged by said power piston, said second bufier piston including throttle means extending therefrom for providing a controlled rate of transfer of the compressed gas from the side thereof on which said gas is admitted to the opposite side upon displacement by said power piston, and
  • a pneumatic device comprising a power cylinder, a power piston slidable within said cylinder, a buffer cylinder, a buffer piston slidable Within said buffer cylinder and engaged by said power piston following a predetermined undamped travel of the latter, conduit means extending from a common source of compressed gas to said power and buffer cylinders at one side of the pistons therein, the compressed gas in said buffer cylinder establishing a force on said buifer piston opposing movement of said power piston upon engagement therewith, and throttle means effective only upon initial displacement of said buffer piston by said power piston to transfer the said compressed gas in said buffer cylinder from one side of said buffer piston to the other thereby providing a damping force having a progressively decreasing characteristic, the pressures on opposite sides of said buffer piston being equalized at the end of its stroke.

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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)
  • Actuator (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
US103648A 1948-07-31 1949-07-08 Pneumatic drive and damping device therefor Expired - Lifetime US2650572A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH3678048 1948-07-31

Publications (1)

Publication Number Publication Date
US2650572A true US2650572A (en) 1953-09-01

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Family Applications (1)

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US103648A Expired - Lifetime US2650572A (en) 1948-07-31 1949-07-08 Pneumatic drive and damping device therefor

Country Status (5)

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US (1) US2650572A (en, 2012)
BE (1) BE490329A (en, 2012)
CH (1) CH265025A (en, 2012)
DE (1) DE848216C (en, 2012)
NL (2) NL74623C (en, 2012)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767601A (en) * 1953-06-15 1956-10-23 Erie Foundry Company Counterbalance cylinder for forging presses and the like
US2923278A (en) * 1955-01-19 1960-02-02 Republic Aviat Corp Loading and ejection mechanism
US3513279A (en) * 1966-12-13 1970-05-19 Toni Wust Device for actuating upsetting steels
US3793925A (en) * 1971-06-15 1974-02-26 Livingston Doughty Ltd Fluid pressure-operated piston/cylinder units
US4482039A (en) * 1981-09-16 1984-11-13 The Garrett Corporation Pneumatic quick disconnect apparatus and methods
US5294090A (en) * 1992-11-25 1994-03-15 Orbit Valve Company Valve snubber

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1130029B (de) * 1958-01-28 1962-05-24 Ckd Praha Narodni Podnik Expansionsventil fuer die Loeschkammer von elektrischen Fluessigkeitsschaltern

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US244092A (en) * 1881-07-12 Hydraulic elevator
US899795A (en) * 1906-10-08 1908-09-29 Elevator Supply & Repair Company Fluid-pressure motor.
US1712786A (en) * 1923-01-29 1929-05-14 Henry C Bosserdet Door-operating mechanism
US1956906A (en) * 1932-08-16 1934-05-01 Treadwell Engineering Company Machine for coiling strips
US2249869A (en) * 1939-01-04 1941-07-22 Westinghouse Electric & Mfg Co Welding apparatus
US2408338A (en) * 1944-06-13 1946-09-24 Cons Car Heating Co Inc Hydraulic device
US2436191A (en) * 1944-11-07 1948-02-17 Gen Electric Electric circuit breaker
US2509472A (en) * 1942-02-20 1950-05-30 Bbc Brown Boveri & Cie Circuit breaker with air damping

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US244092A (en) * 1881-07-12 Hydraulic elevator
US899795A (en) * 1906-10-08 1908-09-29 Elevator Supply & Repair Company Fluid-pressure motor.
US1712786A (en) * 1923-01-29 1929-05-14 Henry C Bosserdet Door-operating mechanism
US1956906A (en) * 1932-08-16 1934-05-01 Treadwell Engineering Company Machine for coiling strips
US2249869A (en) * 1939-01-04 1941-07-22 Westinghouse Electric & Mfg Co Welding apparatus
US2509472A (en) * 1942-02-20 1950-05-30 Bbc Brown Boveri & Cie Circuit breaker with air damping
US2408338A (en) * 1944-06-13 1946-09-24 Cons Car Heating Co Inc Hydraulic device
US2436191A (en) * 1944-11-07 1948-02-17 Gen Electric Electric circuit breaker

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2767601A (en) * 1953-06-15 1956-10-23 Erie Foundry Company Counterbalance cylinder for forging presses and the like
US2923278A (en) * 1955-01-19 1960-02-02 Republic Aviat Corp Loading and ejection mechanism
US3513279A (en) * 1966-12-13 1970-05-19 Toni Wust Device for actuating upsetting steels
US3793925A (en) * 1971-06-15 1974-02-26 Livingston Doughty Ltd Fluid pressure-operated piston/cylinder units
US4482039A (en) * 1981-09-16 1984-11-13 The Garrett Corporation Pneumatic quick disconnect apparatus and methods
US5294090A (en) * 1992-11-25 1994-03-15 Orbit Valve Company Valve snubber

Also Published As

Publication number Publication date
NL74623C (en, 2012)
DE848216C (de) 1952-09-01
BE490329A (en, 2012)
NL87887C (en, 2012)
CH265025A (de) 1949-11-15

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