US1872660A - Power actuator - Google Patents

Power actuator Download PDF

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Publication number
US1872660A
US1872660A US132365A US13236526A US1872660A US 1872660 A US1872660 A US 1872660A US 132365 A US132365 A US 132365A US 13236526 A US13236526 A US 13236526A US 1872660 A US1872660 A US 1872660A
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US
United States
Prior art keywords
piston
cylinder
valve
suction
actuator
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
US132365A
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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
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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 US132367A priority patent/US1826416A/en
Priority to US132365A priority patent/US1872660A/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 US1872660A publication Critical patent/US1872660A/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

  • Our invention relates to a power actuator
  • a power 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 regulating valve or other restricting means, a check valve, and a storage space, 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 foot lever, or other operator opera ed part, and with a brake mechanism or other part to be actuated in such 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, or in case of failure of the actuator, may positively operate the actuated part by physical power appliedto the foot lever, or other operator operated part.
  • the regulating valve or other restricting device prevents such large volumes of air being drawn into the intake manifold as to be likely to dilute the explosive charges passing therethrough, so as to stall the engine when idling while the storage space or storor tank, and comprising a age tank provides a large space in which a partial vacuum or rarification s maintained .at all times, while the englne is running, by withdrawing the air therefrom in comparatively small quantities, and insures the in- 1925, Serial it'o. 506. Benewed February 15, 1982. Divided and this filed August 30, 1926. Serial No. 132,365.
  • one end of the cylinder on one side of the and the immediate result is that the atmospheric air rushes into the end of the cylinder" to which it is admitted, and eflfects the operation of the piston in the desired direction Q and to'the desired extent without any appreciable quantity of air being actually withdrawn from the cylinder and admitted to the intake manifold or other suction means, thereby eliminating the drop in the suction or rarlfication, which would result were the cylinder full of air and this air admitted during the application, of the brakes.
  • the maximum suction isv therefore immediately available.
  • the restricting valve properly adjusted ,,hicles such as automobiles, trucks and motor buses, for example, as when the brake is applied the actuator is operated without any material admission of air to the intake manifold and therefore without any possibility of injuriously affecting the explosive mixture or of stalling the engine, and when the valve mechanism is reversed to effect 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 of the brakes can be gradually withdrawn to the intake manifold, under the control of the regulating valve, so as to prevent interference with the operation of the engine, while securing the effective release of the brake mechanism.
  • the only air to be exhausted is the amount admitted-to the forward end of the cylinder to effect the releasing of the-brakes, which is considerably less than the total amount of air that could be contained in the cylinder, were it not for our invention, which continually keeps at least one end of our cylinder under vacuum, the total amount of air in the cylinder would have to be exhausted after each operation of the brakes.
  • ur invention therefore enables us to simplify and decrease the cost of the apparatus, and at the same time insures the most eflicient operation of the actuator without prejudice to the continuous and eilicient operation of theinternal combustion engine from the suction passage of which the necessary power or suction for the operation of the actuator is derived.
  • Fig. 1 represents a diagrammatic View of an installation in which our improved power actuator is connected with the internal combustion engine of an automotive vehiclefor the operation of thebrake mechanism thereof.
  • Fig. 2 is an enlarged sectional view-illustrating one form of our improved actuator having one embodiment of our present invention therein.
  • Fig. 3 isan enlarged sectional view of the power actuator shown in Fig. 2, portions being broken away.
  • Fig. 4 is a partial-sectional view of our improved power actuator showing another modification of our present invention embodied therein.
  • Fig. 5 is an enlarged sectional view of our power actuator showing still another modi-. fication of our present invention embodied therein.
  • Fig. 6 is a partial sectional view of a por-' tion of the actuator illustrating a slight mod ification of the construction shown in Fig. 5.
  • Fig. 1 of the accompanying drawings We have shown digrammatically an installation suitable for use in an automotive vehicle in which one of our improved actuators is shown as interposed in the connections be tween afoot lever, 88, and brake mechanism for the vehicle, diagrammatically represented at 70, 71 and 72, indicating a brake drum, brake band and brake lever.
  • 60 represents an internal combustion engine for propelling the vehicle, and provided with an intake manifold, indicated at 61, and communicating with the carburetor, 61?, to which is connected a pipe, 62, between the throttle valve indicated at 61 and the engine cylinders, in which pipe are located preferably an adjustable regulating valve, or restricting valve, 64, a check valve, 65, and a vent valve, 67, normally closed and opening outwardly.
  • the pipe, 62 commuof our improved 1 eating with the reversing valve mechanism.
  • the sleeve, 320 is connected by a link, 85, with the foot lever, 88, which is provided with the usual retracting spring, 89, and the piston rod, 305, of the actuator is connectedv by a link, 73, with the brake lever, 72.-
  • 301 represents the actuator cylinder closed atboth ends by heads, 302, connected by bolts indicated at 302*, in Fig. 1, or otherwise.
  • 303 represents the double acting piston provided with oppositely disposed gaskets, 304. 305
  • the hub, 310, of the piston is provided with two valve chambers, 311 and 312 respectively, each of which is provided with two valve seats preferably conical and coaxial with the axis of the piston.
  • the valve chamber, 311, is provided with seats, 313 and 314, and the valve chamher, 312, is provided with valve seats, 315 and 316.
  • the piston hub is provided with an outlet chamber or suction chamber indicated at 317, which communicates with each of the valve chambers through the valve seats, 314 and 315.
  • the piston hub is also provided with a higher pressure chamber, 318, in this instance communicating with the atmosphere and with the valve seat, 316, and by a lateral passage, 319, with the valve seat, 313.
  • the valve actuating part in this instance, a hollow sleeve, 320, passes through a stufiing box, 321, in'the cylinder head at the opposite end of the cylinder from the stuffing box, 306, the said sleeve extending longitudinally through the piston hub and valve chambers, and through the hollow piston rod, 305, and being longitudinally movable to eflect the operation of the reversing valve.
  • the valve s'leeve may be made conveniently in two parts, 320 and 320 if desired, and as herein shown is provided with a pair of oppositely disposed poppet valves in each valve chamber, the said valves being preferably formed of molded. rubber and frictionally engaging the sleeve, so that the sleeve may move through the valve while forming an air-tight joint therewith.
  • the valves are in dicated at 340, 341, 342 and 343, the valves 341 and 342 being suction valves, and the valves, 340 and 343 being air inlet valves.
  • the valves are yieldingly held in engage-' ment with their seats, preferably by a yielding cushioning device. interposed between the pairs of valves, and indicated at 350.
  • the actuating sleeve is provided with suitpipe having a flexible able means for opening one valve of each pair when the sleeve is moved in either direction.
  • the sleeve is shown provided with a collar, 322,1ocated between the suction valves, 341 and 342, and adapted to operate either of the said valves. and the sleeve is also provided with collars, 331 and 332, mounted on the valve sleeve outside of the air inlet valves, '340 and 343 respectively, for operating said valves.
  • the central collar 322, in the vacuum chamber, 317, which actuates the suction valve is so located with respect to a stop, in this instance formed by a shoulder, 326, on the fitting, 326, which engages the adjustable follower, 321*, of the stuffing box, 321, when the parts are in normal or ofi position, that when the piston is arrested by the engagement of its hub with the opposite end of the cylinder, the valve actuating sleeve, 320, will hold the suction valve, 342, slightly off its seat, as shown in Figs.
  • the main body of the piston is in this instance provided with an aperture or passage therethrough indicated at 342 having a valve seat, 342", at the end adjacent to the forward face of the piston, to receive a valve, 342, normally held in closed position by a spring, 342 engaging the valve stem, 342.
  • valve stem, 342 projects from the rear face of the piston (to the right in Figs. 2 and 3) sufficiently to engage a fixed portion of the cylinder, as the the piston, and as the valve, 342, is cracked the air introduced into the cylinder on the forward side of the piston to insure its retraction, or return to normal position, will be exhausted as soon as the piston comes to rest, thus maintaining partial vacuum at all times within the cylinder on both sides of the piston when the parts are at rest and the engine is in operation.
  • the air inlet valve, 343 This connects the cylinder forward of the piston with the suction chamber, 317, and admits atmospheric air in rear of the piston, moving the piston forward in a direction to apply the .brakes, but no appreciable amount of air will be drawn into the intake manifold through the pipe, 62, as the portion of the cylinder forward of the piston is already exhausted.
  • the forward movement of the piston will follow any extent of the forward movement of the brake lever, 88, and when the movement of the brakelever stops,-the piston will continue to move forwardly until the suction valves, 341, and air inlet valve, 343., closed, so as to hold the piston and brakes as applied.
  • the piston being arrested by engagement with the end of the cylinder, and the valve actuating sleeve being arrested by the engagement of the shoulder, 326, with the follower, 321", and the auxiliary valve, 342, being opened by the engagement of its stem with the head of the cylinder.
  • the suction chamber, 317 will therefore be in communication with the cylinder in rear of the piston by reason of the unseated position of the valve 342, and will also be connected with the cyhnder forward of the piston by the auxiliary passage, 342, equalizing the pressures on opposlte sides of the piston, and the air previously admitted, to effect the reverse movement of the piston, will be exhausted from the cylinder producing rarification on both sides of the piston.
  • the withdrawal of the air may, therefore, be
  • the section, 320 of the valve sleeve is provided with arecessed portion, 320*, and a collar, 320, and a piston rod, 305 is in this instance provided with, set screws, 305 extending into said recess (or recesses) 320', so that when the sleeve is moved forward by the foot lever to; apply the brakes, and the piston has followed, applying the brakes to the full capacity of the actuator,,the operator may be pushing the foot lever, 88, further forward until the rear edge of the recess, 320*, engages the screws, 305 apply his physical force to the piston and brake mechanism in addition to the power of the actuator.
  • the operator should the power of the actuator fail, may apply the brakes directly by his physical power, the first forward movement of the valve actuating sleeveiwill set the valves so as to vent the cylinder forward of the piston and admit air in the rear of thepiston, to permit this movement.
  • the retracting spring, 89 will shift the valve sleeve rearwardly, so as to vent the cylinder (in case of failure of power), and the forward end of the recess, 320", will engage the set screws and move the piston rearwardly to release the brakes and restore the parts to or position.
  • the additional valve in the piston itself, it may be located irij'the head of the cylinder and opened by the piston when it returns to its normal position to establish a communication between the two ends of the cylinder on opposite sides of the piston.
  • Such a construction is illustrated in'Fig. 4, in which the corresponding parts are given the same numerals as those in Figs. 2-and 3, with the addition of 100, to avoid unnecessary description.
  • the valve, 442 is held off its seat when the parts are in'normal position, in'the same manner as indicated and previously des ribed with reference to Figs. 2 and 3.
  • the head, 402 of the cylinder is provided with passages indicated at 442*, communicating with a recess, 442, and controlled by a valve, 442, the stem. 442", of wh ch projects into the interior of'the cylinder far enoughto be struck by the hub of the piston when it returns to its normal or retracted position, so as to open the valve, connected by a indicated at 442 with the by-pass or pipe,
  • Fig. 5 we have shown a further modification of the invention, in which the desired results are accomplished without interfering with the normal operation of the valve mechanism, that is to say, in which all four of the valves of the reversing valve mechanism are permitted to firmly seat when the parts are in normal position.
  • the similar parts to those previously described are given the same reference numerals as in Figs. 2 and 3, with the addition of 200, toavoid unnecessary description, an will be identical with those previously described with reference to Figs. 2-and 3.
  • the head, 502 of the cylinder is provided with a passage, or passages, 542, communicating with a recess, 542, in which is located a valve seat, 542, engaged by a movable valve, 542, which valve'during the application of the brakes closes communication between the recess, 542, and the interior of the cylinder on both sides of the piston.
  • the valve is operated by a ring, 542, prothe opening of the valve, 542.
  • the valve seat 542, is connected by a flexible pipe, or
  • tube, 542 with the suction pipe, 562, independent of its connections with the reversing valve mechanism, through the hollow valve sleeve 520, and the valve seat, 542, is also connected by a pipe, 542 with the cylinder on the forward si'deof the piston in the same manner as illustrated in Fig. 4. From this construction it will be noted that when the piston moves forward the valve is seated by its frictional engagement with the piston rod, and may be maintained on its seat by a light spring, 542.
  • piston, and p instead of being located centrally ofvthe cylinder head, practically within the stuffing box, as illustrated in Fig. 5, is located in a separate fitting, indicated at 644, pro 'vided with a threaded portion, 445, which is screwedv into an aperture in the head, 602, of the cylinder.
  • This fitting is provided with a passage, 642, communicating with the interior of the cylinder and controlled by an auxiliary valve, 642, normally held seated by spring, 642", secured in position by a suitable cap, 642, and the fitting is also provided with a threaded aperture to receive a flexible suction pipe, 642, communicating with the main suction pipe, as described with reference to Fig.
  • the fitting is also provided with a pipe, 642, which communicates with the other end of the cylinder on the opposite side of the piston.
  • the auxiliary valve, 642 is provided with a valve stem, 642, which projects into the cylinder in position to be engaged bythe piston when the latter returns to its normal position, so as to open the valveandi establish communication between the vacuum pipe or suc- ,tion pipe leading to the manifold of the en gine, and both ends of the cylinder, and thereby maintaining a partial vacuum within the cylinder on both sides of the piston in exactly the same manner as previously described, with reference to Fig. 5.
  • the check valve, 65 shown in Fig. 1, and interposed in the suction pipe, insures the exhaustion of the cylinder on both sides of the piston to the greatest extent permitted at any time by the operation ofthe engine by the manipulation of the throttle valve, while the vent valve, 67*, shown in Fig. 1, provides for the venting of the cylinder should the motor stop, or the suction fail at any time, and should it become necessary for the operator to apply the brakes by physical power.
  • a power actuator the combination of a cylinder closed at both ends, a double acting piston in said cylinder, reversing valve mechanism includin a suction chamber, passages connecting sai chamber with the cylinder on both sides of the piston, an air inlet, passages connectin said air inlet with the cylinder on both si es of the piston, and controlling valves for said passages, means for connecting said suction chamber with a source of suction, means acting on said valves when the piston is brought to retracted position .for connecting the portion of the cylinder on one side only of the piston with said suct on means, said actuator being provided with valve controlled means for connecting said portion of the cylinder with the portion of the cylinder on the opposite side of the piston, when the piston is in off position.
  • a power actuator the combination of a cylinder closed at both ends, a double acting piston in said cylinder, reversing valve mechanism including a suction chamber, passages connecting said chamber with the cylinder on both sides of the piston, an air inlet, passages connecting said inlet with the cyliner on both sides of the piston, and con-,
  • trolling valves for said passages, means fol connecting sa1d suction chamber with a source of suction, means acting on said valves when opposite side of the pistomand an auxiliary valve for said passage carried by the piston and constructed to be opened when the piston is moved to its ofl or retracted position.
  • a double acting piston in said cylinder a double acting piston in said cylinder
  • reversing valve mechanism includin a suction chamber, passages connecting sai chamber with the cylinder on both sides of. the piston, an air inlet,
  • passages connectin' said inlet with the cylinder on both sides the piston, suction valves and inlet valves for said passages, means for holding and the other seated when the piston is in retracted or off position, to connect the suction chamber with the cylinder on one side of the piston only, said actuator being provided with means for connecting the said portion of the cylinder with the portion of the cylinder on the other side of the piston, when the piston is in retracted position.
  • a power actuator the combination of a cylinder closed at both ends, a double acting piston in said cylinder, reversing valve mechanism includin a suction chamber, passagesconnecting sai chamber with the cylin der on both sides of the piston, an air inlet, passages connecting said air inlet with the suction valves and inlet valves for said passages, means for normally holding said valves seated, means for holding one of said suction valves unseated when the iston is in retractto connect the portion of the cylinder on one side of the piston with the suction chamber, said actuator being provided with an auxiliary passage for connecting said portion of the cylinder with the portion of the cylinder on the opposite side,
  • a double acting piston in said cylinder reversing valve mechanism including a suction chamber, passages connecting said chamber with the cylinder on both sides of the piston, an air inlet, passages connecting said air inlet with the cylinder on both sides of the piston, suction valves and inlet valves for said passages, 'means for holding one of said suction valves unseated, to connect said suction chamber with the cylinder on one side of the piston when the piston is in retracted position
  • said actuator being provided with a passage independent of the passages controlled by the suction and inlet valves for connecting said portion of the cylinder with the portion of the cylinder on the other side of the piston, an auxiliary valve for said passage, and means brought into operation when the piston is in its retracted position, for opening said auxiliary valve.
  • a power actuator the combination of a cylinder closed at both ends, a double acting piston in said cylinder, reversing valve mechanism including a suction chamber, passages connecting said chamber with the cylinder on both sides of the inlet passages connecting said inlet with the cylinder on both sides of thepiston, suction valves and inlet valves for said passages, means for holding one of said suction valves one of said suction valves unseated piston, an air retracted position,
  • an auxiliary valve for said passage dependent of the passages controlled by the reversing valves for connecting said portion of the cylinder with the portion of the cylinderon the other side of the piston, an auxiliary valve for said passage, said auxiliary valve being constructed to be opened bysaid cylinder when the piston comes to 7 rest in its retracted or off position.
  • a power actuator In a power actuator, the combination of a cylinder closed at both ends, a double acting piston in said cylinder, reversing valve mechanism in said piston, means for connecting said reversing valve mechanism with a source of suction and and operator operated means for said reversing valve mechanism, means acting on 'the' valve mechanism for connecting the cylinder on one side of the piston wlth the source of suction when the piston is in retracted or 0 position, said actuator being provided with a passage for connecting the said portion of the cylinder with the portion of the cylinder on the opposite side of the piston, when the piston is in retracted position.
  • a power actuator the combinationoif a cylinder closed at both ends, a double actingpiston in said cylinder, reversing valve mechanism in said piston, means for connecting said reversing valve a source of suction and with the atmosphere, and operator operated means for said re-- versing valve mechanism, the valve mechanism for connecting the cylinder on one side of the piston with the source of suction, when the piston is inretracted or 0E position, said actuator being provided with a passage for connecting the said horrechanism with with the atmosphere,
  • a power actuator automotive vehicles provided with an internal combustion engine having a suction passage, the combination with a cylinder closed at both ends, a double acting piston in said cylinder connected to the part to be operated, reversing valve mechanism including a suction chamber, passages connecting said chamber with the cylinder on both sides of the piston, and air inlet'passages connecting said inlet with the cylinder on both sides of the piston, controlling-valves for said passages, yielding means for normally holding said controlling valves seated, ofasuction pipe for connecting said suction chamber -with'the suction passage-of the engine, means for holding one of said 'valves unseated when the piston is in retracted position to connect the portion of the cylinder on one side of the piston with the suction chamber, said actuator being provided with an auxiliary passage for connecting the portions offlthe cylinder on opposite sides of the piston, an auxiliary valve for controlling said auxiliary passage, means for seating the auxiliary valve, means for opening the auxiliary valve when the piston is in retracted position, and an operator operated part
  • a power actuator automotive vehicles provided with an internal combustion engine having a suction passage, the combination with a cylinder closed atboth ends, a double acting piston in said cylinder connected with'the part to be actuated, reversing valve mechanism including a suction chamber,'passages connecting said chamber with the cylinder on both sides of the piston, and air inlet passages connecting said inlet with the cylinder on both sides ofthe piston,
  • controlling valves for said passages yielding means for normally holding said controlling valves seated, of a suction pipe for connecting said suction chamber with the suction passage of the engine, means for ho1ding one of said valves unseated when the piston is in retracted position, to connect the portion of the cylinder on one side of the piston with the suction chamber, said piston being provided with an auxiliary passage therethrough connecting the portions of the cylinder on opposite sides of the piston, an auxiliary valve for controlling said passage, yielding means for seating said auxiliary valve, means for opening said auxiliary when the piston is brought to retracted position, and
  • I motive vehicles provided with an internal combustion engine having a throttle controlled suction passage, the combination with produce a power stroke thereof.
  • an actuator for said part including a cylinder and a piston movable therein, a suction pipe connecting said cylinder and said source of suction, a high pressure inlet, passages connecting said suction pipe and said higher pressure inlet to said cylinder, and an auxiliary passage connecting the portions of the cylinder to suction on both sides of the piston when the piston is brought to retracted position.
  • vacuum brake mechanism for automotive vehicles provided with an internal combustion engine having a throttle controlled suction passage
  • vacuum brake mechanism for automotive vehicles provided with an internal combustion engine having a throttle controlled suction passage, the combination with a part to be actuated, an actuator for said 15 part including a cylinder and a. piston movable therein, a suction pipe connecting said cylinder and said source of suction, a high pressure inlet, passages connecting said suction pipe and said higher pressure inlet to ac said cylinder, an auxiliary passage connecting the ortions of the cylinder on both sides of the piston, and a valve opening communication through said auxiliary passage when the piston is brought to retracted position. 19.
  • vacuum brake mechanism for automotive vehicles provided with an internal combustion engine having a throttle controlled suction passage
  • an actuator for said so partincliuding a cylinder and a piston movable therein passages leading to and from said cylinder for conveying motive fluid to opposite sides of the piston to actuate the same
  • a power actuator the combination so of acylinder closed at both ends, a double acting piston in said cylinder, reversing valve mechanism including a suction chamber, passages connecting said suction chamber with the cylinder on both sides of the piston, an air inlet, passages connecting said inlet with the cylinder on both sides of the piston, and controlling valves for said passages, means for connecting said suction chamber with a v source of suction, means operable when the so piston is in retracted position for

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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)
  • Multiple-Way Valves (AREA)
  • Braking Systems And Boosters (AREA)
US132365A 1925-01-05 1926-08-30 Power actuator Expired - Lifetime US1872660A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
FR609218D FR609218A (enrdf_load_stackoverflow) 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
US132367A US1826416A (en) 1925-01-05 1926-08-30 Power actuator
US132365A US1872660A (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
US132367A US1826416A (en) 1925-01-05 1926-08-30 Power actuator
US132365A US1872660A (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
US1872660A true US1872660A (en) 1932-08-23

Family

ID=27555365

Family Applications (4)

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
US132367A Expired - Lifetime US1826416A (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
US132366A Expired - Lifetime US1801483A (en) 1925-01-05 1926-08-30 Power actuator
US132367A Expired - Lifetime US1826416A (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) US1872660A (enrdf_load_stackoverflow)
DE (2) DE518737C (enrdf_load_stackoverflow)
FR (2) FR631643A (enrdf_load_stackoverflow)
GB (2) GB245444A (enrdf_load_stackoverflow)

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
GB245444A (en) 1926-11-04
FR631643A (fr) 1927-12-23
GB260967A (en) 1927-08-18
US1826416A (en) 1931-10-06
US1801483A (en) 1931-04-21
DE518737C (de) 1931-02-21
FR609218A (enrdf_load_stackoverflow) 1926-08-11
DE549177C (de) 1932-04-23
US1848000A (en) 1932-03-01

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