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US3822633A - Control means for a fluid-powered device - Google Patents

Control means for a fluid-powered device Download PDF

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Publication number
US3822633A
US3822633A US00279694A US27969472A US3822633A US 3822633 A US3822633 A US 3822633A US 00279694 A US00279694 A US 00279694A US 27969472 A US27969472 A US 27969472A US 3822633 A US3822633 A US 3822633A
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US
United States
Prior art keywords
fluid
chamber
venting
housing
plunger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00279694A
Other languages
English (en)
Inventor
J Ottestad
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.)
Esco Corp
Impulse Products Corp
Original Assignee
Impulse Products Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Impulse Products Corp filed Critical Impulse Products Corp
Priority to US00279694A priority Critical patent/US3822633A/en
Priority to CA174,684A priority patent/CA1005292A/en
Priority to GB2411175A priority patent/GB1421840A/en
Priority to GB3103973A priority patent/GB1421839A/en
Priority to AU57967/73A priority patent/AU470439B2/en
Priority to DE19732336938 priority patent/DE2336938A1/de
Priority to SE7310507A priority patent/SE397116B/xx
Priority to ZA735258A priority patent/ZA735258B/xx
Priority to FR7329136A priority patent/FR2195755B1/fr
Priority to JP48089395A priority patent/JPS4963881A/ja
Priority to US447083A priority patent/US3924513A/en
Application granted granted Critical
Publication of US3822633A publication Critical patent/US3822633A/en
Assigned to ESCO CORPORATION, A CORP. OF OR reassignment ESCO CORPORATION, A CORP. OF OR ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: IMPLSE PRODUCTS CORPORATION
Assigned to IMPULSE PRODUCTS CORPORATION, A CORP. OF CA reassignment IMPULSE PRODUCTS CORPORATION, A CORP. OF CA ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OTTESTAD, JACK B.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/18—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid
    • B06B1/183—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency wherein the vibrator is actuated by pressure fluid operating with reciprocating masses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/06—Means for driving the impulse member
    • B25D9/12—Means for driving the impulse member comprising a built-in liquid motor, i.e. the tool being driven by hydraulic pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L15/00—Valve-gear or valve arrangements, e.g. with reciprocatory slide valves, other than provided for in groups F01L17/00 - F01L29/00
    • F01L15/14—Arrangements with several co-operating main valves, e.g. reciprocatory and rotary
    • F01L15/16—Arrangements with several co-operating main valves, e.g. reciprocatory and rotary with reciprocatory slide valves only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L21/00—Use of working pistons or pistons-rods as fluid-distributing valves or as valve-supporting elements, e.g. in free-piston machines
    • F01L21/04—Valves arranged in or on piston or piston-rod
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L25/00—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means
    • F01L25/02—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means
    • F01L25/04—Drive, or adjustment during the operation, or distribution or expansion valves by non-mechanical means by fluid means by working-fluid of machine or engine, e.g. free-piston machine
    • F01L25/06—Arrangements with main and auxiliary valves, at least one of them being fluid-driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/007—Reciprocating-piston liquid engines with single cylinder, double-acting piston
    • F03C1/0073—Reciprocating-piston liquid engines with single cylinder, double-acting piston one side of the double-acting piston being always under the influence of the liquid under pressure
    • F03C1/0076—Reciprocating-piston liquid engines with single cylinder, double-acting piston one side of the double-acting piston being always under the influence of the liquid under pressure the liquid under pressure being continuously delivered to one cylinder chamber through a valve in the piston for actuating the return stroke
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S173/00—Tool driving or impacting
    • Y10S173/04—Liquid operated

Definitions

  • One valving member is translated in one direction, as the device is fluid-charged, to a point at which said one valving member opens fluid passages to a [52] US. Cl 91/224, 91/235, 991l//226782, triggering chamber to fire the device.
  • the Second 1 valving member holds the triggering chamber open to [51] Int. Cl.
  • a ur 7 1 CONTROL MEANS FOR A FLUID-POWERED DEVICE This invention pertains to control means for fluid powered devices and in particular to such control means which effect automatic recycling of such devices.
  • Control Means for venting fluid from said housing comprising valving means within said housing operative in response to an admittance of pressured fluid into said housing to cause a portion of said housing to become charged to a predetermined level with said pressured fluid, operative to hold said triggering chamber open to venting via said venting means, until said predetermined level is reached, and operative to close off said triggering chamber venting and to direct pressured fluid from said housing portion into said triggering chamber, when said predetermined level is reached, to cause movement of said plunger.
  • a feature of this invention comprises fluid control means employing a pair of valving members to automatically cycle theoperation of the device.
  • One valving member is translated in one direction, as the device is fluid-charged, to a point at which said one valving member opens fluid passages to a triggering chamber to fire the-device.
  • the second valving member holds the triggering chamber open to venting, to drain leakthrough fluid, until the device is about to fire. Then,
  • the plunger is slidably disposed therewithin, the piston and hollow plunger cooperating with an end of the device to define therewithin a chamber for confining a gas.
  • the housing is ported for admitting and venting fluid, such as hydraulic fluid into and from the housing, and the housing, piston and plunger cooperate to define both a charging chamber and a triggering chamber.
  • the hydraulic fluid is admitted to the charging chamber to cause the piston to retract within the plunger to compress the gas.
  • the triggering chamber is provided for subsequently receiving the charge of pressured hydraulic fluid to admit the pressure fluid to an end surface of the plunger, so that the device is fired by causing the plunger to accelerate in a given direction.
  • valving means is provided within the device either integral with the piston, or separate therefrom, to hold the triggering chamber closed off from venting until the device is fired. Subsequently the valving means automatically admits the fluid charge into the triggering chamber for impingement thereof upon the plunger surface. Only thereafter, the valving means vents the triggering chamber.
  • the device-recycling valving means hold the triggering chamber closed to venting all the while the device is being fluid-charged, and opens the triggering chamber to venting only after the device has fired.
  • I teach means for overcoming this limitation, and make it possible for manufacturing tolerances, and clearances of the mating components to be met with relaxed standards. It is an object of this invention, therefore, to teach control means for a fluid-powered device, such as an impact ram or the like, wherein the device has a working plunger, and a'housing supporting the plunger for movement, said housing having a surface cooperating with a surface of said plunger to define a triggering chamber therebetween, and including means for admitting pressured fluid into said housing and means for just prior to the firing, the first valving member opens passages to pressured fluid which drives the second valving member into closure of vent passages to halt the venting of the triggering chamber. Firing of the device returns the first valving member in the alternate direction forre-charging of the device.
  • a fluid-powered device such as an impact ram or the like
  • FIG. 1 is an axial cross-sectional view of a first embodiment of the invention; & FIG. 1A is a detail thereof.
  • FIG. 2 is a partial cross-sectional view taken from FIG. 1 showing thedevice in a first operative position;
  • FIG. 3 is a partial view corresponding to that of FIG. 2 showing the device in a second operative position
  • FIG. 4 is an axial half cross-sectional view and half external view' of an alternate embodiment of the invention.
  • FIGS. 5 and 4 depict details of the means which supply pressured fluid into the end cap assembly for charging of the device (of FIG. 4); and means for draining the fluid from the device.
  • FIG. 6 is a partial, axial, half cross-sectional view and half external view of the FIG. 4 embodiment valving arrangement which effects recycling of this embodiment of the device, according to the invention.
  • FIGS. 7-9 depict operational functioning of the seal
  • a fluid-powered device 10 the same being an impact ram, which incorporates the control means 12 of the invention.
  • the device 10 comprises a housing 14 in which a hollow plunger 16 is slidably received, the plunger confining therewithin a piston 18 which defines an inner chamber 20 of the plunger.
  • the chamber 20 receives a charge of gas, via a port 22 and fitting 24, for resiliently constraining the piston 18 in the illustrated direction within the plunger 16.
  • One end 26 of the piston is matingly received by an orifice 28 which is carried by an orifice retainer 30.
  • the retainer 30 has a surface 32 which defines a triggering surface for the plunger 16. This surface 32 cooperates with the end cap assembly 34 of the device to define a triggering chamber 36.
  • the piston 18 has a probe 38 extending therefrom which makes a substantially sealed, sliding fit within a bore 40 formed within a seal base 42 which is coupled to the end cap assembly 34.
  • An orifice seat 44 is disposed between the seal base 42 and orifice 28.
  • the seal base has a recess 46 in an end thereof to receive a poppet 48, the poppet and piston probe 38 being concentrically assembled. Vent channels 50 and a vent chamber 52 formed in the end cap assembly 34 open onto a vent port 54 which communicates with a fluid reservoir (not shown).
  • the poppet 48 has a conical terminal 56 which opens or closes off the vent channels 50, whereby the triggering chamber 36 is permitted to open onto the reservoir or is closed off from venting.
  • the seal base 42 has a second recess 58 in which is received a skirt 60 of the poppet 48.
  • An annular limit stop member 61 is set within recess 46.
  • the seal base 62 has a pair of triggering ports 62 formed therethrough which open internally of the seal base, onto recess 58, and open externally onto the triggering chamber 36.
  • the piston probe 38 is hollow substantially throughout the length thereof and has a pair of lateral ports 64 adjacent the terminal end thereof for purposes to be explained hereafter.
  • pressured hydraulic fluid is admitted by way of a housing fluid inlet port 66 to communicate with a retum chamber 68 defined between the plunger 16 and the housing 14 for subsequent admittance through a plunger fluid inlet port 70 and therefrom into the charging chamber 72 of the device.
  • the charging chamber 72 is defined by the outer surface of piston end 26, and surfacing presented by the seal base 43, the orifice seat 44 and the orifice 28.
  • Poppet 48 is caused to withdraw from port 54, thus a precipitate build-up of fluid pressure in triggering chamber 36 cannot occur; the movement of poppet 48 into recess 58 holds the triggering chamber 36 open to venting. It is hydraulic fluid pressure which opens port 54, and holds it open all the while that the charging chamber 72 is being charged with fluid. Leakage hydraulic fluid, the same being at some pressure level, upon reaching the triggering chamber 36, can only open port 54. In chamber 36, the minimal quantity of moderately pressured leakage fluid cannot overcome the restraint of plunger 16, yet, poppet 48 presents a considerable impingement surface, in its concial terminal 56, and must yield, and move into recess 58. Accordingly, the poppet 48 is always operative to hold the triggering chamber 36 open to venting all the while that the chamber 72 is being charged.
  • the pressured hydraulic fluid admitted via port 66 will cause the piston 18 to translate down through the plunger 16 to compress the gas confined within chamber 20.
  • the piston 18 continues to move, as the chamber 72 is being charged, and all this while the poppet 48 is displaced from the port 54 in the end cap assembly 34, to provide for free venting of the triggering chamber 36, as just described.
  • the pressured fluid in chamber 72 can pass through these ports 64 and out the hollow end of the probe 38 to effect two results.
  • the pressured fluid impinging upon a dome-shaped surface 74 of the poppet 48 causes the poppet to move into port 54 and close off the vent chamber.
  • the pressure fluid is admitted through the triggering ports 62 into the triggering chamber 36. Consequently, the triggering surface 32 of the plunger 16 receives the pressured fluid, and the plunger is driven on its working stroke.
  • FIGS. 2 and 3 These operations are depicted in FIGS. 2 and 3.
  • FIG. 2 is shown the charging of the chamber 72 and the partial translation of the piston 18 within the plunger 16.
  • the poppet 48 is displaced from the poppet seat in port 54, and the triggering chamber r 36 is fully open to venting.
  • FIG. 3 the piston 18 has traveled most of its full distance; the lateral ports 64 have just cleared the lowermost surfaces of the seal base 42, and the highly pressured fluid within the charging chamber 72 can pass therethrough to seat the poppet 48 and close off the venting of the triggering chamber 36, and impinge on surface 32 to move the plunger 16 on its stroke.
  • FIG. 4 shows an alternate embodiment of the invention in which same or similar index numbers signify same or similar components.
  • This embodiment is also incorporated in a device 10' having a housing 14' and a plunger 16 with an end cap assembly passage 78 for venting the pressure fluid from the device.
  • FIGS. 5 and 4 illustrate the coupling of a drainage pipe 80 for removing the fluid from the vent passage 78, and the supply of pressured hydraulic fluid to a port 82 formed in the end cap assembly 34.
  • a pipe 84 carries the fluid to port 82, and a short channel 86 conducts the fluid to chamber 76.
  • Passage 78 opens onto a vent port 54' which receives a poppet 48'.
  • the poppet 48' which has lateral ports 64 (only one is shown) for admitting the triggering fluid pressure into the triggering chamber 36.
  • the piston probe 38 in this embodiment is not hollow, neither is it drilled through with passageways.
  • the poppet 48', the piston probe 38 and the seal base 42 each have relieved surfaces 88, 90 and 92, respectively, formed therein, these surfaces being cooperative to define an annular passageway, about the piston probe 38, to communicate the charging chamber 72 with the ports 64 in the poppet 48' for admittance of the pressured fluid through the triggering ports 62 (only one is shown) formed in the seal base 42' to the triggering chamber 36.
  • the piston probe 38', poppet 48 and seal base 42 also have lands 96, 98 and 100, respectively, which cooperate to prevent the admit-- tance of the pressured fluid into the triggering chamber 36' until the piston 18 has traveled a predetermined distance within the plunger 16'.
  • the poppet 48' is displaced from the vent port 54 in the end cap assembly 34 all the while that the device is charging. Again, this is to accommodate the venting of leakthrough fluid which passes between the orifice 28 and the seal base 42'; and between the piston probe 38 and the seal base 42 and poppet 48 prior to the piston 18? having traveled its full required distance.
  • the annular passageway is defined about the piston probe 38' and admits the fluid first to the poppet 48 to hold the poppet sealingly against the seat of port 54, to prevent any further venting of the triggering chamber 36.
  • the fluid further proceeds through the lateral ports 64 in the poppet 48' down through the seal base triggering ports 62 into the triggering chamber 36'. There it' impinges upon the orifice 28 to cause the plunger to be driven on a working stroke.
  • the triggering charge which both fired the plunger 16 and forced the poppet 48 to its seat, is spent; also, as the piston 18 rebounds under the force of the gas, it forces hydraulic fluid around the orifice seat 44 through the vent channels 50 to bear on the conical terminal 56 of the poppet 48.
  • the poppet opens the port 54, and remains displaced fromthe port until another triggering force seats it again.
  • the piston 18 first seals with the orifice 28, as the plunger 16 continues to retract, and then the plunger 16 seals with the orifice seat 44. As the plunger 16 is finally seating, becoming fully retracted, the piston 18 is displaced from the orifice 28; this is to expose an impingement surface of the piston 18 to cause it to yield to the incoming, pressured hydraulic fluid and to become charged again for the next stroke.
  • the depicted embodiments have features operative to prevent a high pressure stall from occuring. These features, with reference to FIGS. 1 and 8-10 for device 10, and FIG. 7 for device 10, are described in the following paragraphs.
  • Seal base 42 (FIGS. 1, 7-9) has a pair of pins extending therefrom. Pins 110 are disposed for contacting the head of piston 18, upon the return of piston toward the seal base, and for holding the piston a specified distance away from orifice 28 as the orifice closes upon the orifice seat 44. This is necessary to be able to charge the device 10 for an on-following cycle, because of the geometry of the piston 18 and orifice 28.
  • the piston 18 and plunger 16 are retracting from a preceeding firing of the device 10.
  • a reasonably effective seal obtains at point A while both the piston 18 and plunger 16 move together toward the seal base 42.
  • FIG. 8 In FIG. 8 is shown that operative progression where the following events proceed to occur: Pins 110 contact the head of piston 18, preventing further piston travel; seal point A proceeds to migrate away (downwardly) from its prior location; and a new, reasonably effective seal B proceeds to be joined between the orifice seat 44 and the orifice 28. Seal B is first located only at the lowermost extremity of orifice seat 44; as the plunger 16 continues to seat, seal B grows in depth along a short, axially-disposed, annular interface of seat 44 and orifice 28.
  • FIG. 9 shows the piston 9 held off, by pins 110, from closure against orifice 28, providing access to the head of the piston 18 for the in-charging hydraulic fluid. Seal point A on piston 18 is displaced from the orifice 28, yet seal B is fully joined.
  • Piston 118 has an annular shoulder 112 which impinges against the lowermost surface of seal base 42 to prevent a closure of chamber 72' to the head of the piston. Yet, when the piston 18 and plunger l6are retracted toward the seal base 42, a seal is maintained at A. This seal opens, but only after another seal B is commenced between the ori-' fice 28' and the seal base 42', upon the shoulder 112 engaging the seal base, and as the orifice 28 fully closes upon the seal base.
  • Control means for a fluid-powered device such as an impact ram or the like wherein the device has a working plunger, and a housing supporting the plunger for movement, said housing having a surface cooperating with a surface of said plunger to define a triggering chamber therebetween, and means for admitting pressured fluid into said housing and means for venting fluid from said housing;
  • Control means for a fluid-powered device such as an impact ram or the like wherein the device has a working plunger, and a housing supporting the plunger for movement, said housing having a surface cooperating with a surface of said plunger to define a triggering chamber therebetween, and means for admitting pressured fluid into said housing and means for venting fluid from said housing;
  • venting means for resiliently and normaliy constraining said wall member in a given direction relative to said housing portion; wherein said venting means comprises a fluid conductive passageway open to venting at one end thereof, and opening onto said triggering chamber to another end thereof;
  • closure means and said wall member each have pressured-fluid-impingement reaction surfaces
  • said wall member reaction surfaces being disposed to receive housing-admitted pressured fluid thereupon to effect a movement of said wall member in a direction other than said given direction;
  • said wall member has conduit means operative for conducting pressured fluid from said housing portion to both said reaction surface of said closure means and to said triggering chamber, only upon said wall member having moved a predetermined distance in said other direction, to cause said closure means to close off said passageway to halt venting of said chamber.
  • said conduit means comprises an elongated probe
  • said housing has a bored-through seal base element fixed interpositionally between said housing portion and said triggering chamber;
  • said bore of said element receives said probe therewithin
  • said probe has a fluid-conductive passage formed therein which opens at one end thereof externally of said probe, at an location intermediate the length of said probe, and which opens internally of said probe, at the other end of said passage, at the terminal end of said probe;
  • said passage communicates said housing portion both with said one triggering port and said reaction surface of said closure means, only upon said piston having moved said predetermined distance.
  • Control means according to claim 3, wherein:
  • said venting means passageway includes an annular venting chamber
  • said closure means comprises a poppet
  • said element cooperates with said housing to define said passageway therebetween;
  • said poppet has a land formed thereon which obstnucts and opens said port;
  • said probe and said poppet are concentrically disposed within said housing.
  • Control means according to claim 4, wherein:
  • said poppet has a recess centrally formed therewithin;
  • said probe is received within said recess.
  • said other end of said passage of said probe is ori-- ented toward said recess.
  • Control means for a fluid-powered device such as an impact ram or the like wherein the device has a working plunger, and a housing supporting the plunger for movement, said housing having a surface cooperating with a surface of said plunger to define a triggering chamber therebetween, and means for admitting pressured fluid into said housing and means for venting fluid from said housing;
  • valving means within said housing, operative in response to an admittance of pressured fluid into said housing to cause a portion of said housing to become charged to a predetermined level with said pressured fluid operative to hold said triggering chamber open to venting, via said venting means, until said predetermined level is reached, and operative to close off said triggering chamber venting and to direct pressured fluid from said housing portion into said triggering chamber, when said predetermined level is reached, to cause movement of said plunger; wherein said valving means includes a wall member movably disposed within said housing, and
  • venting means for resiliently and normally constraining said wall member in a given direction relative to said housing portion; wherein said venting means comprises a fluid-conductive passageway open to venting at one end thereof, and opening onto said triggering chamber at another end thereof;
  • closure means said said wall member each having pressured-fluid-impingement reaction surfaces;
  • said wall member has probe means cooperative with said closure means and said housing to define a conduit for conducting pressured fluid from said housing portion to both said reaction surface of said closure means and to said triggering chamber, upon said wall member having moved a predetermined distance in said other direction, to cause said closure means to close off said passageway to halt venting of said chamber.
  • Control means for a fluid-powered device wherein the device has a movable, working plunger, means supporting the plunger for movement, said plunger having a fluid-impingement triggering surface, said supporting means and said surface cooperatively defining a triggering chamber therebetween, means for admitting fluid into said chamber for causing impingement of fluid on said surface to move said plunger, and means for venting fluid from said chamber, said admitting means including means for storing an increasingly pressured charge of fluid;
  • valving means interposed between said chamber and said admitting and venting means, operative to communicate said chamber with said venting means only until stored, pressure fluid is conducted to said chamber, and operative in cooperation with said admitting means to conduct stored, pressured fluid from said admitting means to said chamber, only when said stored fluid achieves a predeterminedpressure level; wherein said admitting means further includes means for addressing admitted fluid to a portion of said plunger to constrain said plunger against movement until said stored fluid achieves said predetermined level.
  • a fluid-powered device such as an impact ram or the like, comprising:
  • said plunger having a fluid-impingement triggering surface
  • valving means interposed between said chamber and said admitting and venting means, operative to communicate said chamber with said venting means only until said admitting means conducts fluid into said chamber; wherein said admitting means includes means for storing an increasingly pressured charge of fluid, means cooperative with said valving means for conducting stored, pressured fluid to said chamber only when said stored, pressured fluid achieves a predetermined level, and means for addressing admitted fluid to a portion of said plunger to constrain said plunger against movement until said stored fluid achieves said predetermined level.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Actuator (AREA)
  • Control Of Presses (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
US00279694A 1972-08-10 1972-08-10 Control means for a fluid-powered device Expired - Lifetime US3822633A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US00279694A US3822633A (en) 1972-08-10 1972-08-10 Control means for a fluid-powered device
CA174,684A CA1005292A (en) 1972-08-10 1973-06-21 Control means for a fluid powered device
GB2411175A GB1421840A (en) 1972-08-10 1973-06-29 Valving means for controlling fluid through a passageway
GB3103973A GB1421839A (de) 1972-08-10 1973-06-29
AU57967/73A AU470439B2 (en) 1972-08-10 1973-07-11 Control means fora fluid powered device
DE19732336938 DE2336938A1 (de) 1972-08-10 1973-07-20 Hydraulische einrichtung
SE7310507A SE397116B (sv) 1972-08-10 1973-07-31 Styrorgan for en fluidumdriven anordning
ZA735258A ZA735258B (en) 1972-08-10 1973-08-01 Control means for a fluid powered device
FR7329136A FR2195755B1 (de) 1972-08-10 1973-08-09
JP48089395A JPS4963881A (de) 1972-08-10 1973-08-10
US447083A US3924513A (en) 1972-08-10 1974-03-01 Control means for a fluid-powered device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00279694A US3822633A (en) 1972-08-10 1972-08-10 Control means for a fluid-powered device

Publications (1)

Publication Number Publication Date
US3822633A true US3822633A (en) 1974-07-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00279694A Expired - Lifetime US3822633A (en) 1972-08-10 1972-08-10 Control means for a fluid-powered device

Country Status (9)

Country Link
US (1) US3822633A (de)
JP (1) JPS4963881A (de)
AU (1) AU470439B2 (de)
CA (1) CA1005292A (de)
DE (1) DE2336938A1 (de)
FR (1) FR2195755B1 (de)
GB (2) GB1421840A (de)
SE (1) SE397116B (de)
ZA (1) ZA735258B (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157121A (en) * 1977-02-04 1979-06-05 Chicago Pneumatic Tool Co. Hydraulic powered rock drill
US5269382A (en) * 1992-05-08 1993-12-14 Esco Corporation Impact device
US5626068A (en) * 1994-04-12 1997-05-06 White Manufacturing (Proprietary) Limited Hydraulic reciprocating mechanism
US6155353A (en) * 1999-07-23 2000-12-05 Ottestad; Jack B. Impact tool
US20050145400A1 (en) * 2003-12-19 2005-07-07 Clark Equipment Company Impact tool

Citations (4)

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US343569A (en) * 1886-06-15 coopee
US1157924A (en) * 1915-07-21 1915-10-26 Charles Christiansen Pneumatic tool.
US3137483A (en) * 1958-01-24 1964-06-16 Zinkiewicz Wiktor Ground burrowing device
US3524385A (en) * 1966-07-11 1970-08-18 Impulse Prod Corp Control means for fluid-powered devices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US343569A (en) * 1886-06-15 coopee
US1157924A (en) * 1915-07-21 1915-10-26 Charles Christiansen Pneumatic tool.
US3137483A (en) * 1958-01-24 1964-06-16 Zinkiewicz Wiktor Ground burrowing device
US3524385A (en) * 1966-07-11 1970-08-18 Impulse Prod Corp Control means for fluid-powered devices

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4157121A (en) * 1977-02-04 1979-06-05 Chicago Pneumatic Tool Co. Hydraulic powered rock drill
US5269382A (en) * 1992-05-08 1993-12-14 Esco Corporation Impact device
US5626068A (en) * 1994-04-12 1997-05-06 White Manufacturing (Proprietary) Limited Hydraulic reciprocating mechanism
US6155353A (en) * 1999-07-23 2000-12-05 Ottestad; Jack B. Impact tool
US20050145400A1 (en) * 2003-12-19 2005-07-07 Clark Equipment Company Impact tool
US7156190B2 (en) 2003-12-19 2007-01-02 Clark Equipment Company Impact tool

Also Published As

Publication number Publication date
GB1421839A (de) 1976-01-21
SE397116B (sv) 1977-10-17
FR2195755B1 (de) 1978-12-29
ZA735258B (en) 1974-07-31
GB1421840A (en) 1976-01-21
CA1005292A (en) 1977-02-15
JPS4963881A (de) 1974-06-20
FR2195755A1 (de) 1974-03-08
AU5796773A (en) 1975-01-16
DE2336938A1 (de) 1974-02-28
AU470439B2 (en) 1976-03-18

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