US1826416A - Power actuator - Google Patents

Power actuator Download PDF

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Publication number
US1826416A
US1826416A US132367A US13236726A US1826416A US 1826416 A US1826416 A US 1826416A US 132367 A US132367 A US 132367A US 13236726 A US13236726 A US 13236726A US 1826416 A US1826416 A US 1826416A
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United States
Prior art keywords
valve
piston
suction
cylinder
valves
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
US132367A
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English (en)
Inventor
Caleb S Bragg
Victor W Kliesrath
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.)
Bragg Kliesrath Corp
Original Assignee
Bragg Kliesrath 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
Priority to FR609218D priority Critical patent/FR609218A/fr
Priority claimed from US506A external-priority patent/US1879598A/en
Priority claimed from US66961A external-priority patent/US1811994A/en
Priority to GB32638/25A priority patent/GB245444A/en
Priority to DEB123437D priority patent/DE518737C/de
Priority to US132365A priority patent/US1872660A/en
Priority to US132367A priority patent/US1826416A/en
Priority to US132366A priority patent/US1801483A/en
Application filed by Bragg Kliesrath Corp filed Critical Bragg Kliesrath Corp
Priority to GB24964/26A priority patent/GB260967A/en
Priority to FR631643D priority patent/FR631643A/fr
Priority to DEB127874D priority patent/DE549177C/de
Priority to US303412A priority patent/US1848000A/en
Publication of US1826416A publication Critical patent/US1826416A/en
Application granted granted Critical
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/241—Differential pressure systems
    • B60T13/242—The control valve is provided as one unit with the servomotor cylinder
    • B60T13/243—Mechanical command of the control valve, mechanical transmission to the brakes

Definitions

  • apower actuator of this general type connected with the intake manifold of the internal combustion engine by means of a pipe or passage in which are located an adjustable regulatin valve or other restricting means, a check valve, and a storage space, or tank, and comprising a cylinder, a double acting piston therein, and reversing valve mechanism for' applying differential pressures on, opposite faces of the piston, and said actuator being combined with a' fot lever, or other part to be actuated in suchv manner that the latter can be operated by the actuator under the control of the foot'lever while the operator may add his physical power to the power of the actuator when desired,
  • the regulating valve or other restricting device prevents such large volumes of air being drawn into the intake manifold as to be therethrough, so as to stall the engine when idling while the storage space or storage tank provides a large space in which a partial vacuum or Tarification is maintained at all times.
  • the brake'is applied the actuator is operated without any material admission of air tothe intake manifold, and therefore without any possibility of injuriousl affecting the explosive mixture or of stal ing the engine, and
  • e when the valve mechanism is reversed to ef- 90 can be gradually Withdrawn to the intake feet the release of the brakes, by operating the piston in the opposite direction, the atmospheric air admitted for the purpose of obtaining the previous application ofthe brakes manifold, under the control of the regulating valve, so'as to prevent interference with the o eration of the engine, while securing the eective release of the brake mechanism. If the motor should stall, due to the admission of this air when the brakes are being released, it would be a matter'of far'less importance than the stalling of the motor when the brakes are being applied.
  • Our invention therefore enables us to simplify and decrease the cost ofthe apparatus, and at the same time insures the most eicient operation of the actuator without prejudice to the continuous and eicient'operation of the internal combustion engine .cally to anot from the suction passage of which the necessary power or suction for the operation of the actuator is derived.
  • the presentapplication is directed specifier specifieembodiment for carrying the inventlon into eiect disclosed in our 'previous application above referred to, but not specifica l claimed therein, but which is specifically c aimed in this application.
  • FIG. 1 represents a diagrammatic view of an installatronin which ourfimproved ower actuator is connected with themterna combustion engine of an automotive vehicle for the operation of lthe brake mechanismTthere- ⁇
  • FIG. 2 is an enlarged sectional view i1- lustrating one form of'our improved actuator having one embodiment of our present invention therein, a portion ofthe piston rod' and-'valve actuating sleeve being Ibroken away and showing the piston in normal retracted position.
  • Fig. 3 is a detail sectional view of the termmaLportions ofthe piston rod and valve" actuating sleeve omitted from Fig. 2.
  • Fig. 4 is a detail sectional view of a portion of the construction shown in Fig. 2.
  • Fig. 1 of the accompanying drawin we have shown diagrammatically an instali]- tion suitable for use in-an automotive vehicle in which one of our improved actuators is shown as interposed in the connections between a foot lever, 88, and brake mechanism for the vehicle, diaI ammatica ly represented at 70, 71 and 2, indicating a brake drum, brake band and brake lever.
  • the brake mechanism will be provided with the usual retracting means for restoring it and assisting in restoring the piston of the actuator to the retracted or normal position, said means being indicated diagrammatically in Fig. 1, by the spring, 74.
  • 60 represents an internal combustion enginefor propelling the'vehicle, and provided with an intake manifold, indicated at 61, and communicating with the carburetor, 6l, to which is connected a ipe, 62 between the throttle valve, indicate at 61", and the engine cylinders, in which pi are located preferably an adjustable regu atingvalve, or restricting valve, 64, check valve 65, 'and a vent valve, 67 normally closed, and openin outwardly.
  • the pipe, 62 communicates witg one of our im roved power actuators, the cylinder of which is indica-ted at 701, in Fig..1, the saidl nected to a link, 85, with the foot lever, 88, which is provided with the usual retracting spring, 89, and the piston rod, 205, of the actuator is connected by a link, 7 3,- with the brake lever, 72.
  • Fig. 2 we have shown one form of our improved actuator embodying our present invention.
  • 701 represents the actuator cylinder closed at both ends by heads, 702, connected by bolts, indicated at 702, in Fig. 1, or otherwise.
  • 703 represents the double acting piston provided with oppositely disposed gaskets, 704.
  • 705 represents a -hollow piston rod which extends through a stufiing box, 706, in one end of the cylinder, and is connected at its inner end with the piston, 703.
  • the hub, 710, of the piston is rovided with two valve chambers, 11 and 12 respectively, each of which is provided with two 4valve seats preferably conical and coaxial with the axis of the piston.
  • the valve chamber, 711 is provided with seats, 713 and 714, and the valve chamher, 712, is provided with valve seats, 715 and 716.
  • the piston hub is provided with an outlet chamber, or suction chamber, indicated at 717, which communicates with each of the valve chambers through the valve seats, 714 and 715.
  • Arl'he piston hub is also provided with a higher pressure chamber, 718, in this instance communicating with the atmosphere and with the valve seat, 716, and by a lateral passage, 719, with the valve seat, 713.
  • the sleeve, 720 passes through a stufiing box, 721, in the cylinder head at the opposlte end of 'the cylinder from the stufiin box, 706, the
  • valve sleeve extending lon itu inall through the piston hub and va ve cham ers, and through the hollow piston rod, 705, and being iongitudinally movable to eiiect the operation of the reversing valves.
  • the valve sleeve may. be made conveniently in two parts, 720 and 720, if desired, and as herein shown, is provided with a pair of oppositely disposed poppet valves in each valve cham- 'fer, the said valves being preferably ormed of molded rubber and frictionally engaging 'the sleeve, so that the sleeve may move through the valve while forming an air-tight joint therewith.
  • valves are indicated at 740, 741, 742 and 743, the valves, 741 and 742 hein suction valves, and the valves, 744) and 743 eing air inlet valves.
  • the valves are -1 yieldingly held in engagement with their seats, preferably by an elastic cushioning device interposed between the palrs-.of valves, and indicated at 750.
  • the actuatlng sleeve is provided with suitable means for opening one valve of'each pair when the sleeve is moved in either direction. 1n this instance sleeve is shown provided with a fixed collar, 722, located adjacent to the suction valve, 741, and a collar, 722g, which is movable longitudinally of the sleeve, 720, by
  • lmeans of connecting red, 744 extendin through the hollow sleeve, 7 20, and connecte at its forward end to an actuating part adapted to be brou ht into operation when the parts have reac ed their normal or retracted positions as illustrated in Fig. 2.
  • the valve sleeve is also provided with collars, 731 and 732, for operating the .air inlet valves.
  • the sleeve will e arrested in such osition that the fixed collar, 722, will slig tly unseat the valve, 741, permitting communication between the vacuum chamber, 717, of the cylinder on the forward side of the piston through the port or passa e,'734.
  • the movable collar, 722 is capab e of being moved longitudinally with respect to the valve actuating sleeve by meansof a connecting rod, 744, extending through the hollow sleeve, 720, connected to the collar, 722l at its inner end, and connected at its forward or outer end to an actuating part, adapted to be brought into operation when the parts have reached their normal or retracted position.
  • an adjustable collar, 747 which ma be in the form of a nut engaging a threa ed portion on the exterior of the fitting, 745, and provided with a stop pin, 748, which engages a part of thecylinder, in this instance the valve, 7 21, of t e stufiing box, 7 21, ⁇ so as to rock the fitting, 745, in the direction of the arrow, Fig. 2, when the valve sleevel is restored to its ⁇ retracted or normal position, b the retracting spring of the foot pedal.
  • the piston will be arrested by engagement of its hub with the end of the cylinder.
  • the valve yactuating sleeve will be arrested by the engagement of the collar, 726with the valve, 721, this opening the suction valve, 741, closing the air inlet valve, 740, and holding the suction valve, 7 41, in open position.
  • the engagement of ⁇ the pin, 7 48, with the follower or other stationary part of the Y cylinder will effect the opening of the suction valve, 742.
  • the suction chamber, 717 When, as before stated, the parts come to rest, the suction chamber, 717, will, therefore, be in communication with the cyl inder on both sides of the piston and will vexhaust the air previously admitted to effeet the reverse movement of the piston, leaving it again submerged in vacuum.
  • the withdrawal of the air may, therefore, be distributed over a great or,less period of time, according to the adjustment of the valve, 64, so as to avoid the undue dilution of the explosive charges or the feeding of too small an amount of hydrocarbon fuel, and the piston is left submerged in vacuum and readyl for immediate and effective operation to apply the brakes at any moment.
  • valve actuating sleeve, 720, 720 with the piston by ⁇ means providing for a limited amount of lost inetion, sufficient to permit the operation of the valves, so that after this lost motion is taken up, the physical power of the operate.1 can be directly applied to the piston and the brake mechanism connected therewith, tov en able the ofperator to add his'physical force i to that o the actuator,or tooperate the brakes by his physical force alone if the power should fail for any reason, the lost motion. permitting 'the 4movement'. of the valves in any case, and serving when power lll@ fails to vent the cylinder. In. the present instance, as shown in Fig.
  • the section, 720, of the valve sleeve is provided with a recessed portion, 720", and a collar, 720C, and a piston rod, 705, is in this instance provided ywith set screws, 705, extending into said recess (or recesses) 720", so that when the sleeve is moved forward bylthe foot lever to apply the brakes, and the piston has followed applying the brakes to the full capacit o the actuator, the oy erator may, by pu 'ing the foot lever, 88, urther ⁇ forward until the rear edge of'the rece, 720", will appl his physical force to the piston and there y to the brake mechanism, in addition to the power of the actuator.
  • an o rator operated part connected with said va v e o erating part, a retractin spring operative y connected withv said va' ve operating part, means for arresting said valve o rating part when the piston is in retracte position, in position to hold one of said valves o n to connect the cylinder on one side of t e pis-v ton with the low pressure source, means carried o 'n said valve actuating part and, Inovable independently with respect to said valve actuating' part for operatively engaging another of said valves, and means for arresting said independently movable valve engaging means part when the piston is 1n normal reacting movable part carried by andthe engine is in operation,
  • a ower actuator the combination of a cylin er closed at both ends, a double piston in said cylinder, reversin valve mechanism, means for connectin said reversing valve mechanism with a so ce of suction and with the atmosphere, a longitudinally extending valve actuatin part movable with the pistonl and exten mg through apertures in said valves, and rovlded with means for opening a suction va ve, and an air inlet valve when moved in either direction including a fixed collar attached to said valve actuating part fo'r engagin one of the suction valves, and a movable co lar on said valve actuati part and movable with respect thereto or engaging the other suction valve, means for arresting said sleeve in position tohold one of said suction valves open when the piston is in normal retracted position, a
  • va'lve actuatin part and movable with respect thereto and operatively connected with said movable collar, a retracting spring operatively connected with said valve actuating part, and means for effecting a relative movement of said movable part with respect to the valve actuating part when the piston is in retracted position to open the other of said suction valves, and maintain the piston vsubmerged .in vacuum when retracted.
  • va power actuator the combination of a" cylinder closed at both ends, a double acting piston in said cylinder, reversing valve mechanism located in the hub of the piston, and comprising suction and inlet valves, means for connecting the suction valves with a source of suction, means for connectin the air inlet valves with the atmosphere, ylelding means for normallyseatin said suction and inlet valves, a longitudina ly extending valve actuating sleeve through apertures in said parts and provided with means for opening -a suction -valve and an air inlet valve' when moved in either direction, said means including a fixed collar attached to said valve actuating part adjacent to one suction valve and a movable collar carried by said valve actuating part and movable longitudinally thereon and located adjacent to the other suctionvalve,l means for arresting said sleeve in position to hold the suction valve adjacent to said'A stationary collar in partially open position, a" movable part carried by said
  • a power actuator the combination of a cylinder closed at both ends, a double acting piston in said cylinder, reversing valve mechanism located in the hub of the piston, and comprising suction and inlet valves, means for connecting the suction valves with a source of suction, means for connecting the air inlet valves with the atmosphere, a longitudinally extending valve -actuating sleeve through apertures in said parts and provided With means for opening a suction valve and an air inlet valve when moved in either direction, said means including a fixed collar attached to said valve actuating part adjacent to one suction valve and a movable collar carried by said valve actuating part and movable longitudinally thereon, and located adjacent to the other.
  • suction valve means for arresting said sleeve in position to hold the suction valve adjacent to said stationary collar in artially open position, a movable part carrie by said sleeve, projecting laterally thenefrom and movable relatively with respect to the sleeve, a connection between said movable part and said movable collar extending longitudinally through said sleeve a retracting spring operatively connected with the valve actuating part and means for effecting a movement of said movable part and said movable collar with respect to said sleeve, when the piston is in normal retracted position for positively opening the other of said Suction valves, to maintain the piston submerged in vacuum when retracted.
  • a power actuator the combination of a cylinder closed at both ends, a double acting piston in said cylinder. reversing valve mechanism located in the hub of the piston, and comprising two pairs of oppositely disposed coaxial valves, each pair including a suction valve and an air inlet valve ,yielding means interposed between the valve of each pair for seating the same, means for connectmg the suction valves with a source of suction, means for connecting the air inlet valves with the atmosphere, a valve actuating part extending longitudinally through one end of the cylinder through said valves and provided with means for opening a suction valve and an airA inlet valve when moved in either direction, including a fixed collar at.
  • valve actuating part adjacent to one suction valve and a movable collar carried by said valve actuating part, and movable longitudinally thereon, and located adjacent to 'the other suction valve, an operator operated part connected with said valve actuating part, a retracting spring operatively connected with said valve actuating part, a stop'carried by the valve actuating part for engaging a part connected with the cylinder, when the piston is in normal retracted position, to enable said xed collar to hold its adjacent suction valve in open position, a movable part carried by said valve' actuating part and movable with respect therel" to, connections between said movable part and said movable collar, said movable part being provided with a portion adapted to engage a part connected with the cylinder' when the piston is in retracted position for with the cylinder 'on both sides of the piston,
  • valves for controlling said suction and air inlet passages, and yielding means normally tending to seat all of said valves, vacuum producing means connected with said vacuum chamber, a longitudinally extending valve actuating sleeve, extending through apertures in said valves and provided with means for opening one of the suction valves and one of the air inlet valves, when moved in either direction including a collar section fixed to said sleeve, and a movable collar section located between said suction valves, a
  • the combination with power actuator comprising among its members a cylinder closed at both ends, a piston in said cylinder, reversing valve mechanism in the piston, including a suction chamber. passages connecting it with the cylinder on both sides of the piston, air linlet passages connected with the cylinder on both sides vof the piston, suction and air inlet valves controlling said passages, and yielding means normally tending to seat said valves, of means for connecting the said sucton chamber with the suction passage of the engine, a valve actuating part provided with means for opening said valves ICO the longitudinal movement of the valve actuating part, so disposed as to effect the opening o't' one inlet valve and one suction valve when the valve actuating part is moved in either direction with respect to the piston, 'the .valve opening means for said suction valves being movable with respect to each other, a.
  • retracting spring operatively connected with said valve actuating part, means called into action when the piston is in normal retracted yposition to arrest the valve actuating part,and shift said suction valve opening means with respect to each other to maintain both suction valves in open position, and maintain the piston submerged in vacuum, an operator operated part connected with the valve actuating part, and means for I connecting the piston with a part to be actuated.
  • an automotive vehicle provided with-l an internal combustion engine having a suction passage and brake mechanism for the vehicle
  • a power actuator comprising among its members a cylinder closed at each end, a piston in said cylinder, reversing valve mechanism located in the piston, including a suction chamber, passages connecting,r itwith the cylinder on both sides of theppiston, air inlet 'passages connected with the cylinders on both sides of the piston, suction and air inlet valves controliing said passages, and yielding means normally tending to sea-t said valves, of means for connecting the .said suction chamber with the suction passage of the engine, a valve liftnating part extending through said valvesy and to the exterior of the cylinder, and provided with means for opening one of said suction valves and one of said inlet valves when moved in either direction, including.
  • a tixed part on said valve actuating part for engaging one suction valve, and a part movable with respect to the valve actuatingpart and carried thereby forV engaging the other suction-valve, means for arresting the valve actuating part in position to hold one suc-- tion valve open by said fixed openingmeans when the piston is in retracted position, a retracting spring operatively connected with the valve actuating part, andV means for 'shifting said movable opening means to .effect the opening of the other suction valve when 'the plston 1s 1n normal retracted posltion, to
  • a valve actuating part extending through said valves and to the exterior of the cylinder, and provided with means for opening one of said suctionv valves and one of said inlet valves when moved in either direction, including a fixed part on said valve actuating part for engaging one suction valve, and a part movable with respect to the valve actuating part and carried thereby for engaging the other suction valve, a@ retracting spring operatively connected with the valve actuating part, means for arresting'the valve actuating part in position to hold one suction valve open by said fixed opening means when the piston is in normal retracted position, lto connect the portions of the cylinder'on both sides of the pistowith each other and with the suction passa e of the engine, and maintain the piston sumerged in vacuum
  • suction and air inlet valves controlling said passages, and yielding means normally tending to seat said valves.
  • valve mechanism for controlling differentials of pressure to opposite sides of said piston including a valve operating member and valves movable with and wlth respect to said member, an element carried by said valve operating member, means for limiting the movement of said member to hold one of the low pressure valves in open position when the piston is in normal retracted position, and a second element shiftable with respect to the first element, together with means for shifting saidsecond Velement to open the other low pressure valve and there.
  • valve mechanism for controlling dilerentials of pressure' to opposite sides of ysaid piston including a valve operating member and valves movable with and with respect to said member, an element connected to move with said valve operatlng member, vmeans to limit the movement of said valve operating member so as to hold'one of" the low pressure valves open when the piston is in normal retracted'position, and a second element movable on the valve operating member and engaging with the-other low renssure valve to openthe same when the plston is retracted, together with means for operycc ating said second member.
  • a power actuator a cylinder, a piston movable therein connected with a part to be actuated, valve mechanism for 'controlling differentials of pressureto opposite sides-of said piston including a valve operating meniber, and high and low pressure valves movable with and with'v respect to'said member, valve engaging elements on said member, means for arresting said valve operating member to hold one -of said low pressure valves in open position iwhen the piston is in n ormal retracted position, and means for relatively separat-ingsaid elements to open the other low pressure valve when the plston is retracted.
  • a power actuator a cylinder, a pis- ⁇ ton movable therein, inlet and outlet passages for conveying motive fluid to and from said cylinder to actuate said piston, valves for said passages, actuating collars for said valves, means for arresting one of said collars ⁇ in posltion to hold one of the .outletvalves in open position when the piston is in normal retracted position, and means Aadapted to move said actuating collars relatively to each other to unseat the other of said outlet valves when the piston is in retracted position, to

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
  • Braking Systems And Boosters (AREA)
  • Multiple-Way Valves (AREA)
US132367A 1925-01-05 1926-08-30 Power actuator Expired - Lifetime US1826416A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
FR609218D FR609218A (enrdf_load_html_response) 1925-01-05
GB32638/25A GB245444A (en) 1925-01-05 1925-12-24 Improvements in and relating to power actuators or servomotors
DEB123437D DE518737C (de) 1925-01-05 1926-01-06 Durch Unterdruck bewegte Hilfskraftbremseinrichtung, insbesondere fuer Kraftfahrzeuge
US132365A US1872660A (en) 1925-01-05 1926-08-30 Power actuator
US132367A US1826416A (en) 1925-01-05 1926-08-30 Power actuator
US132366A US1801483A (en) 1925-01-05 1926-08-30 Power actuator
GB24964/26A GB260967A (en) 1925-01-05 1926-10-07 Improvements in power actuators or servomotors
FR631643D FR631643A (fr) 1925-01-05 1926-10-19 Perfectionnements aux dispositifs d'actionnement
DEB127874D DE549177C (de) 1925-01-05 1926-10-23 Hilfskraft-Unterdruckbremseinrichtung
US303412A US1848000A (en) 1925-01-05 1928-09-01 Power actuator

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US506A US1879598A (en) 1925-01-05 1925-01-05 Power actuator
US66961A US1811994A (en) 1925-11-05 1925-11-05 Power actuator
US132365A US1872660A (en) 1925-01-05 1926-08-30 Power actuator
US132367A US1826416A (en) 1925-01-05 1926-08-30 Power actuator
US132366A US1801483A (en) 1925-01-05 1926-08-30 Power actuator
US303412A US1848000A (en) 1925-01-05 1928-09-01 Power actuator

Publications (1)

Publication Number Publication Date
US1826416A true US1826416A (en) 1931-10-06

Family

ID=27555365

Family Applications (4)

Application Number Title Priority Date Filing Date
US132367A Expired - Lifetime US1826416A (en) 1925-01-05 1926-08-30 Power actuator
US132365A Expired - Lifetime US1872660A (en) 1925-01-05 1926-08-30 Power actuator
US132366A Expired - Lifetime US1801483A (en) 1925-01-05 1926-08-30 Power actuator
US303412A Expired - Lifetime US1848000A (en) 1925-01-05 1928-09-01 Power actuator

Family Applications After (3)

Application Number Title Priority Date Filing Date
US132365A Expired - Lifetime US1872660A (en) 1925-01-05 1926-08-30 Power actuator
US132366A Expired - Lifetime US1801483A (en) 1925-01-05 1926-08-30 Power actuator
US303412A Expired - Lifetime US1848000A (en) 1925-01-05 1928-09-01 Power actuator

Country Status (4)

Country Link
US (4) US1826416A (enrdf_load_html_response)
DE (2) DE518737C (enrdf_load_html_response)
FR (2) FR631643A (enrdf_load_html_response)
GB (2) GB245444A (enrdf_load_html_response)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2880706A (en) * 1956-09-27 1959-04-07 Bendix Aviat Corp Servo-motor having chatter eliminating means
US3664235A (en) * 1969-09-22 1972-05-23 Serck Industries Ltd Fluid pressure operated servo arrangement
US3841449A (en) * 1972-08-29 1974-10-15 Cybergenics Inc Clutch with vacuum release motor
US4667567A (en) * 1983-03-23 1987-05-26 Nippon Air Brake Co., Ltd. Pull-type booster for vehicle

Also Published As

Publication number Publication date
DE518737C (de) 1931-02-21
US1848000A (en) 1932-03-01
US1801483A (en) 1931-04-21
FR631643A (fr) 1927-12-23
GB245444A (en) 1926-11-04
GB260967A (en) 1927-08-18
FR609218A (enrdf_load_html_response) 1926-08-11
US1872660A (en) 1932-08-23
DE549177C (de) 1932-04-23

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