US2468943A

US2468943A - Pressure fluid servomotor

Info

Publication number: US2468943A
Application number: US594577A
Authority: US
Inventors: John R Parsons
Original assignee: Individual
Current assignee: Individual
Priority date: 1945-05-18
Filing date: 1945-05-18
Publication date: 1949-05-03
Anticipated expiration: 1966-05-03

Description

`Maly 3, 1949. JL B'. PARSONS PRESSURE FLUID SERVOMOTOR Fild May 18, 1945 INVENToR. JDHN B- .UARSUNE Patented May 3, 1949 smits-.asf

PRESSURE-FLUID SERVOMOTGR?` John-Bt Bassens, ToledwDhio i Application ll/llay18',- 1945,' Serial No. 594577 SGla-ims: l (Cl. 121-744.);

This invention relates" to regulator-'mechanismn for windows ofvehiclestsuch", for example,- as: automobiles*,-' inwhichthes-window is-.mounted?i for swinging movement; butfinore` particularly ilo-Ventilating Wings-or vanes suchas arernounted 5. onautorriobile-- doors onfanl up -and'fdowntv axis: to swing-between open',and-Pclosedffpositionsvso asaeitlier todeect--aiIl-insid'e ofith'e automobile.; or'towithdiawvair-'from the insideeoi'the;auto@y provedrneclianism for automaticallyA actuating- Windows tof the raboVe-type,-the same constituting an improvemeifi-t`Y on the strtucture shown: and described-fin my Patent.2;838,965 dated J antuary` Ventilatinglwings, tothe end 'that the structurel' may-be:A manufactured more easily; the parts.- beingl` adapted` for more eiiioientv assembly; the structure asa" Whole' being more sturdy, positive. and reliable irl-performance- Otheif objects and advantages of `the inventioniwill hereinafter appear andffor-purposesof.illus. tration but not of limitation, anf'ernbodimentfof the inventionV is L. show/"nv on f the accompanying divavlfings-iniWlriich-vv g5 Figure-Lis a-fragmentaryside elevation ofthed front end portion -ov an' automobile--showingrthe- Ventilating Wing, parts' being.. broken.V away: to2 show the -regulator-r-mechanism and-the pump and connections-:being di'agrainmatically illustri'ati-d; 30

Figu-refzis atop-.plan Viewv offt'new-regulator; mechanismindicating by Abroken* lines `thepositions to.. Which-the Ventilating vaneY or fwfing vmay beeadjusted;r

FigureiS is an enlargedvertical. sectional eleva-w 35 tion.of-rthefregulatorandv itsVA associated 'electro--- magneticallyI controlled valve;

Figure miskl a: perspectivey View' of 'the piston" 40 bodyportion; and

Figure.l Slis: an enlarged 'fragmentary sectional 1' View:y ofl the piston-assemblyandasso'ciated spring; taken .on ,the-linetfGf-'Biof -Fi'gure4.1

The.-i1lustrateslz1 embodiment-'- of y the invention Y- 45 comprises .aney automobile body i I l'i having a side door II provided with a Window open-ing I2finA|` whichxtheusual vertically movablefwindow panel is mountedfl Forwardly of f the opening I 2 and@ separated: thererorn by a-H vertically-r` disposedf159 guidmbar I3.'-'is-=a VentilatingYK WingA orv Vane 14;' which-.isfpivotedfto swing f-about an up and'downv axiss thiefupper.l pivotfy being--V indicatedf' by@- the-'- numbem 51':and.theloweib pivot-beingfindioated Fb'yw theinumberf 63h Fixed toll-the lvanel 4 Afandflderiend-= l 55 ing from the :pi-vot I5 is a atsidedfpostr-:vlvl'g whichv extends betweenthefxsides. of-raf'yoke- Ig'fvanpinc or bolt I9 extending through registered apertures` in the post I'I and yoke I8 :for holding th'e part-s4r together;- It' willbe manifest thatbye'rotationfof the -yoke |83 thev ventilatings Wing-f` |42 may.1 bei: swung about' its axis; as indicate-d fby ^th"e"brokena lines onFigurefZ.'

The yoke' Ier forms aI part of thief regulatorx'A mechanism= andf-"as'shoWn-on Figurefis anfing-1 tegral 'part of the -slotted'stub shaftfIlintowhich?v the straightfportion of a'helical ribbonefshaftitd is f securely :positioned-'by a: Abolt `22.y The gradual*v curvel23f off` the helix` is' formed "by:k twisting'l aw flat', elongate f, steelribbon .to fthe f desined contour; the ribbony being shownA rectangularw in cross-isection.

Fitting-the helicalnibbon shaftZtus 'as piston* 2451;'y which' is formed Withfa,v slotted central 'opener' t ing-15A conforming to 'the cross sectionHoFan'd" havinga slidingv t With"the -sha'it 2i" sotla't'f' the' `piston @can `-move longitudinally of 'the 1 shaft 2 i; The-"piston 24`comprises= a vsubstantially reetangularfplate or body portion Malti-om the' l under iside 'of which dependv four integral should:-1

ered'- pinsY 2T: A" rectangularl resilient f' rubber* packin e-disc 2Bis'-apertu1^edf'to fitover theI-pins l 2i' landv retaining the rubber disc placefis a* rectanguia-r'inetallicplate 28"'Wliich isals'o aber tuledto -tover the pins 2;the llatter-being upset?A or-frivetedfo-ver as indicateclonA Figure 6 t'o hold`l`v thev rubberl disc v2i5^and plate 28 in position. It'

will-'be observed'that'the.slot\25fin the' plate 24d is y'off ltiour-vv glass shape-inf'crcssv section andia'sl shown'lin F'igure; registering slots are ffiri'ri-ed1r in^the^disc 2E'fand'plate28? It" should 'be noted` thatfthe'rubber discf26fis soconstructed andfar ranged Ythat-"it notfonly effects 'a-'fliquidv tight seal outwardly with th'ein-ner Walls-oi the cylinderibut'-V als'o alords an effective liquid'ftight seal inwardly4p with ther-helical `shaft or-r'ibbon 2'Il On t`rie 'upper side -of th'e body-:portion 242iofi: the -fpiston'fz L"and-fat"eacl'corner thereof Vare `rupistandingrfintegral'ngers 2711,. thef-outer surfaces-1Av of which are rounded?A4 Approximately midwayofvt tlieflengthfoffeach' nger on the inside there:\i""'is formedwan-y inwardly r`eitenzlin'g Ishoulder ZIb'f'th'ef saine being formed by reducing lthe thickness fof f the' nif-:tal'of the finger projecting:outwardly; th`e1efrom.' Itwill be manifest that the-v piston 24 may be convenientlyfformedbyf-fdie-'castingi The" piston f 24 vis loiigitudin'ally -slidable in ani elongate f sheet metalv housing' 29"* which isfr` Tectangularvin cross'f-sectionwith'-'tl1'e rofnlners'tl'ieie'C )ff rounded as-` indicated ion Figureiiand"'confornis to the curvature of the outer surfaces of the ngers 27a. The fingers 21a militate against the piston binding Within the housing, insure a smooth sliding movement and also provide a mounting and enclosure for one end portion of a coil spring 3B.

Manifestly the piston 24 is held against rotative movement but sliding movement thereof longitudinally of the elongate housing 2S is permitted. As a consequence, the longitudinal sliding movementl of the piston 24 imparts rotative movement to the helical shaft 2| due to the cooperative engagement of these parts.

A-s will hereinafter more fully appear, fluid under pressure, such as a liquid, is introduced into the lower portion of the housing 29, thereby causing the piston 24 to travel upwardly within the housing 29 and impart rotational movement to the shaft 2l in one direction. It will be manifest that downward movement of the piston 2li causes rotational movement of the shaft 2l in the opposite direction. Such downward movement of the piston 24 is effected by the coil spring 3l).

Integral with the stub shaft Zil and disposed a short distance below the yoke I8 is an annular collar 3! directly beneath which is another collar 32 of smaller diameter. The annular collars 3l and 32 are held between the cupped end plate 33 and a curved metallic plate 3d. which acts as a bearing element and is backed by the end plate 33. The metallic end plate 33 serves to close the upper end of the elongate housing 29 and is securely positioned by fitting into the groove formed by crimping the upper end of the metallic housing 29 over the end plate 33. The upper annular collar 3l rides between a packing 36, which also snugly embraces the stub shaft 2!! and contacts tbe end plate and. a lower packing ring 3l, which embraces the lov-fer annular collar 32 and contacts the metallic plate It will be apparent that the shouldered portion of the collar il! cooperating with the metallic end plate and plate 36% provides a thrust bearing for the shaft 2!! serves to retain the shaft the desired posit-fon.

The lower nortion of the casing 29 extends downwardly below the lower end of the shaft 2 l, mounted therein is an eleotroneagnet controlled valve assembly 38, which includes a solenoid i within which is disposed a valve member Ali? which is normally urged upwardly to its seat by a coil spring 4|, a portion of the latte being disposed within a sleeve 42. The arrangement is such that upon energizing the solenoid coil 35i, the valve member 4E! is moved downwardly, tensioning the spring lll and enabling the fluid under pressure to flow therethrough to the piston. 24. When the solenoid coil 39 is deenergized., coil spring lll moves the valve to :its seatV thereby trapping the fluid within the casing 29 and retaining the shaft 2! in its adjusted position. Thus upward movement of the piston 24 is effected by the introduction of the fluid under pressure to the casing 29.

When it is desired to eiiect movement of the vane M in the opposite direction, the solenoid coil is energized but the source of pres-sure fluid is inoperative, thereby enabling the coil spring il!! to force the piston 24 downwardly and effecting a reverse rotation of the shaft 2i. Thus, it will be manifest that the valve lil serves both as an inlet valve to admit fluid under pressure for actuating the piston in an upward direction and also` as an outlet valve through which fluid is expelled from the cylinder upon downward movement of the piston in response to the expanding force of the coil spring. A still further advantage of the valve il@ is that it serves automatically to relieve pressure in excess of a predetermined maximum within the cylinder. Thus, in the event of expansion of the pressure fluid within the cylinder and beneath the piston, for example when the wing or vane is in closed position, the pressure so built up will unseat the valve lli), thereby relieving the pressure and militating against injury or damage to the regulator parts.

The extreme lower end of the casing 29 is closed by an end plate 43, which is held in place by crimping the end M of the casing 29 about the end plate 43, which at its inner section seats onto a shoulder in the sleeve 0.2. The sleeve 42 ls drilled for fluid passage and pipe connections 45.

Detailed description of the source of pressure fluid is not considered necessary. Suffice it to say that a motor pump unit 4S containing its own fluid reservoir forces fluid such as oil under pressure through a tube ll to the sleeve 52, the tube 4l also serving as a return line to enable iiuid from the casing 2li to return to the reservoir. A switch 48 is indicated, one lead lli) therefrom extending to the solenoid coil 39, another lead 50 extending to a relay for controlling the unit 46, and a third lead E! extending to a battery B or source of electrical current. The switch may assume the form as shown and described in my Patent 2,344,452, dated March le, 1944, and is such that either the solenoid 39 may be energized alone, or the solenoid 3Q and the pump unit 46 simultaneously may be operated, depending on the manner in which the switch @lli is actuated.

It is to be understood that numerous changes in details of construction, arrangement and operation may be effected without departing from the spirit of the invention especially as defined in the appended claims.

What I claim is:

l. A fluid pressure servo-motor comprising an elongate casing rectangular in cross section with the corner portions thereof rounded, a piston conforming substantially to the cross section of said casing and mounted therein for reciprocatory movements, said piston comprising a body portion shaped to t within said casing, fingers extending from the corners of said body portion with the outer surfaces thereof rounded to conform to the rounded corners of said casing, pins projecting from the opposite side of said body portion, a resilient rubber disc apertured to fit said pins, means to hold said disc in place against said piston body portion, a shaft adapted to be operatively connected at its outer end to the work and projecting inside of said casing, an elongate helical actuating element on said shaft for rotation therewith, said piston having a slot fitting said actuating element whereby longitudinal movement of said piston imparts rotary movement to said shaft, a mounting within said casing for said shaft for holding same against axial movements, and means for effecting piston movement longitudinally of said casing.

2. A fluid pressure servo-motor comprising an elongate sheet metal casing rectangular in cross section with the corners thereof rounded, a piston conforming substantially to the cross section of said casing and mounted therein for reciprocatory movements, said piston having a body portion having a slot of hour glass shape in cross section, fingers rising from the corners of said body portion respectively and shaped on the outside thereof to conform to the curvature of the corners of said casing, pins depending from said body portion, a resilient rubber disc having a slot registering with the slot in said body portion, and apertured to t said pins, a plate having a slot registering with the slots in said body portion and disc and apertured to fit said pins, the outer ends of said pins being upset to hold the parts in place, a stub shaft mounted at one end of said casing and having a portion projecting outwardly thereof for connection to the window panel, and a yoke portion projecting inside of the casing, an elongate ribbon-like helical actuating element tting said registering apertures in the piston body portion, disc and plate, means for clamping one end portion of said actuating element between said shaft yoke, a thrust bearing for said shaft, and a, coil spring within said casing and having one end portion bearing against said piston body and disposed within said fingers.

3. A fluid pressure servo-motor comprising an elongate casing polygonal in cross section, a piston conforming substantially to the cross section of said casing and mounted therein for reciprocatory movements, a shaft adapted to be opera- 6 tively connected at its outer end to the Window panel and projecting inside of said casing, an elongate helical actuating element on said shaft for rotation therewith, said piston including a rubber disc providing outwardly a liquid-tight seal with the casing walls and inwardly a liquid-tight seal with said actuating element, and means for effecting piston movement longitudinally of the casing.

JOHN B. PARSONS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 358,977 Joyner Mar. 8, 1887 853,615 Ageron May 14, 1907 901,550 Nicholson Oct. 20, 1908 1,072,104 Ebersole Sept. 2, 1913 1,208,115 Eynon Dec. 12, 1916 1,481,568 Smith Jan. 22, 1924 1,741,871 Mitchell Dec. 31, 1929 2,240,039 Hickman Apr. 29, 1941 2,338,965 Parsons Jan. 11, 1944