US1650134A

US1650134A - Guabd mechanism

Info

Publication number: US1650134A
Authority: US
Publication date: 1927-11-22
Anticipated expiration: 1944-11-22

Description

Nov. 22, 1927. 1650134 l AQ E. KINTNER GUARD MECHANI SM 3 Sheets-Sheet l Mya/V701? 52. @y @ai Nov. z2, 1927. 1,650,134

A. E. KINTNER GUARD MECHANISM Filed Oct.3, 1 3 Sheets-Sheet 2 Nov. 22, 1927.

A. E. KINTNER GUARD"A MEGHANISM 3 SheetsZ-fheet 3 2 y im@ Patented Nov. 22, 1927.

n, y 1,650,134 UNiTEDfSTArEs .PATENroFFica f Y ALCIN n.xinrnnn, or rAiNrisvrLiinQoHro.

GUARD MEcHANIsii/r.

Application filed October 3,'1922. Serial No. 592,160.

rlhis invention relates to mechanism for guarding or protecting openings in buildings, .or places of possible entry, such as windows, `doors and 'passagewaya by unauthorized persons.

s One object of the invention is toprovide a guard mechanism of relatively simple construction.

Another object of the-invention is toprovide a guarding yor protecting mechanism having relatively movable yelements which arey capable of. beingpositi-oned to protect or guard `an opening, or nested relativel to eachother to permit unobstructed use o the opening. f n

Another object of the'invention is to provide in kmechanismV ofk this character improv-ed means for supporting and moving kthe protecting or guarding elements, whereby they. may be readily moved from their operative position to their inoperative posi tion, and vice versa.y s

Other objects of th-e invention will be apparent 'to those skilled in the art to which my invention relates from the following description taken in connection with theaccompanying drawings, wherein Fig. 1 is ank elevation of a window frame and window and a guard mechanism emi? bodying my invention associated therewith.k is a section on the line 2-20fl Fig. 2 Fig. 1.

F ig. 3 is an lelevation showing the guard mechanism in operated position-that is,

' moved into position to guard-the window andprevent entry therethrough, parts being broken away to facilitate the illustration.

Fig. 4 is a s-ection on the line 4--4 of Fig. 3. f

Fig. 5 isa section onthe line 5 5 of VFig. 3.

Figs. 6 and 7 are fragmentary side' eleva tional views'illustrating details of construc tion.

Inthe drawings, 1 indicates a frame forming` an opening 2 which is to be protected or guarded. The frame 1 constitutes the frame for a window, this being shown as the preferred application of my` invention. It will however be understood that the guard mechanism, later to be described, is primari-` yly lto be yintended to protect or guard an opening to prevent .the entryV therethrough of unauthorized persons, it being immaterial so far as the: present inventionk 1s concerned and in carrying out its purpose whether the `with it a 'closingidevice such as 'a door or a window sash or sashes. The frame 1 is preferably providedv with guiding devices 3, e, 4', forming guid-es in different vertical planes to accommodate sliding window sashes 5,6. f "l 7 indicates an auxiliary frame arranged to, be permanently fixed within the frame 1 in any suitable mannenpref-erably on the outer. side of the sashes 5, 6. The auxiliary frame 7 may be incorporated with the frame 1 when assembledor appliedthereto after it is complet-ed and utilized in a building structure A. The auxiliary frame 7 serves to cover certain'elements of the guard mechanism, indicated as an entirety at 8, in such manner that the latter cannot be tampered with at any time. Where the auxiliary frame y7 is applied to the frame 1 subsequent to its kcompletion or assembly in abuilding structure,it is preferably constructed to support the supporting devices and guarding elements so that the latter and the auxiliary frame maybek assembled as substantially a unitary structure.

The auxiliary frame 7 lpreferably com- .prises a pair. of angle plates 7 and upper and

lower cross members

9, 10, respectively,

lconstituting the 4opening 2 toform chambers 9', 10'-, respectively, the purpose of which will be later set forth..

Referring to the

guard mechanism

8, 11, 12, indicate a pair of devices extending along the opposite sides of the Vopening 2k and adapted to support a plurality of guard elements 13; By preference, the supporting

f devices

11, 12, 'extend along the vertical sides of the opening V2 and the guard elements 13 engage with the devices'11,'12, at their oppositev ends and' move vertically thereon. 'lhesesupporting devices 1 1, 12 are preferably arranged relatively close to the inner `faces of the vside walls 7 b, this arrangement serving to position the guard elements 13 close Y,to these walls as well as the'cross

members

9, 10, thereby preventing the insertion of tools betweeny the guard elements and the auxiliar frame 7. For this nur. ose ,the

opposite ends of each side wall 7":L ofthe plates 7 may be turned inwardly as shown at 7X and suc-h ends are' formed withopen- Vthe motor shaft 21 and theshaft 17, this train, preferably; comprising a worm 21a .iixed .tothe shaft 21 and a worm gear 21b ings 14 which receive and form bearings for..

the opposite ends of the adjacent supporting devices 11 oi 12. Each ofg. the supporting;

devices

11, 12, comprises a rotatable shaft having.;(1) `a. threaded. section 15. .(extendf.;

ingl from a'pointi slightlyv abovefthealowerj edge of the lupper` cross memberfQ to a-.point below-theupper edge of thelowercross meine` ber 10 or` a. connecting plate-1()K between it andthe `adjacent:plate 7 whichi fits a.. screw threaded opening 13 formed. in the..

adjacent l end of; each guardi element V13 and co-acts therewith.y and in co-operation with thescrew Athfreadsaof the` ,other supporting .ina-tic stop mechanism indicated asfan` ene tiretyatc24,iasishownin'xigs; 1, Band-.6.-

AThe;l brusl-i` carrying frame 23 is; truiinioned on the armature shaft 21 (as will beun#v derstood. from-Figs v3, f1 `and 6): and. one trunnion off theafraine 23-` has connected to y 1 device and .the threaded opening at the vothen i eiidf of the. guard element, 13 Ytoipropel the."

latter, into and .out of operative position:-l as .will be; later described and (2),` aniunthreaded sectionl 15a (efrtendingdnto the` chamber 9') along which the elements 13; may uslide -when moved upwardly by the threaded sections 15 of the

shafts

11, 12,'.

wherebythey/may be :nestediii compactfrela:

tion. in. their inoperative position, as shown:

in Fig. 11. The cross member 9.is ofawidth f to accoinmodatefall of.y tlieguard yelements operativeipositioii,soA as to leave the openingl 2" formed bythe plates 7 Vmembers 9, 1.0, unobstructed.y

Figi,` 1 showsv the. guardelements; nested together in the chamber 9', To move the guard `elements into. operative position, the,

V supporting devices

11, 12, aresimultaneously r `13-vwhen theyare nested or ,moved into-in-.f

. and .cross rotated i by adriving; 'mechanismy indicated as an,entiretyv at 16, the screw threads. on

the. devices -1l, `12, `engagingwith tliezthreads .i in the'openings.; 13 of` the guard elements:

13 .and operating therethrough to-inove v.the

latter from: the chambertonpositions. bridging theopening 2, as shown. ingFig..

3. The drivingniechanisin 1'6- coinprisesfthe following instrumentalities: 17 indicates it aispindle25. which projects axially of the armature-f shafti 215i through.v an opening aldi formedfinthe .frameinember 1"and carries yat 'its outer, end; a. handle: 26, wherebywthe brush carrying frame 23 may be moved in one-direction or the otheri toeifect operation of the motor inthe desired direction. They handle26 may be provided with a pointer.Y

27 which will pointto indicating characters (sc e Fig. 7) to indicate the direction in which the handle should :be moved to operate the guard elements 13.

28 findicates devices extending between andfconiiecting each guardelement with vthe -neXt,or succeeding element. The functionsof the devices 28'are'to (1) co-operate with the guard elements' 13` toprotect the opening, 2. 4or entry thereto byrestricting the spaces between. the guard elements 13 and (2); effectsinovement of the elements 13 from theichamben- 9" intofengagement with the screw threads 15 of the supporting devices. 11,'.12,',in;the manner to: be later described.V

:The connecting. devices 28 preferably coinprise-pair' of links .28 pivotally connected bevel gears fixcd .to the lowerigends ofither;

shafts

11, 12. 18 indicatesbevel gearsfixed to a .shaftV 17 and meshingA with thegears 17.. `The shaft. 17n extends transverselyof. the; opening,` 2 through the chamber 10.".A

The shaft17`is supported at one. end inV a g. standard 1,9; its other `end extendsgthrough;

and supported inY an vopening` 20 formed end,permittingthe application of power to Vthe shaft; 17 a whereby the` shafts 11', 12, mayy .1 thereof. @ne link inthe adjacentupright 1"?, such extended at theirainner.endsto each other and at'their remotes ends to the adjoining guard elements.

13,I .thisA construction permitting the guardV elements to move relative to each other into a nestedor compact relationship when fed upwardly by the

shafts

11, 12, into theL chamben 9.', I'. preferably providetwo pairs of links/.28. betiweeni adjoining guard elements 13 and space each pair at points substantially midway -hetween thea longitudinal center.; lineirofthe opening 2. Vand one side of each .pair may beprovided with'.ayprojectiirg lug 28b to'limit 3 their unfolding movementzat an'obtuse angle be rotated..` 21;;indicates an electric motor.

sired manner to the; frame..member1"l bute within the side members 1C, 1C', as shown in Fig. 1. 22yindicatesa gear. train between...

(see Fig. A3);y sov that rthey .will readily fold or articulateV whenv .the supporting devices areroperated tomovetheguard elements 13 upwardly. into, thel chamber 9.n

29;'indicates as; an entirety meansarranged to 'engage'.fwithficertain of the' guard;l elements Y135.when...nevsted :in the; chamber y9 and*maintain-ehemal-thereinmaliemma 1,650,134;y -y ,l

taining y.m'eans29 are arranged, atta point( .Y abovelthe kplalnegin fwhiehthe screw threads flfon/the supporting devices-,(111, l2, termi nateanclnormally project intothe path ot y movement ot the e'lenientxl so as to'engage :element- 13. 'tondo-ye fitintoseligagelnelit.with thfegp-` screw threads 1-fl5,-t-he --Mmaintain'ing y ineajns,-29 *releasesy the element andl then j arf# the lower edgesthereofixceptthe lower#- lvvith the screw threads I5 until they-.-V are Wardly-y as,f already described, and it acts throughl its connection 28 4.upon the nextv reststheanextgor succeeding element 13e-and wardly into operative position.

. holdsit-nntil it inwturn is'gacted `u-ponfby'v thefconnect-*ng-.devices 28A betiveen it and:

` the v rpreviously` 'released element 13, This operation islrepeated for each guard element, 13in until allghave; been successively engaged With the screw threadsv 15 and moved-Vdorvn-Y K'plhe :maintai'ningv means 29 Ipreferably comprisefpairsfot dogs BKO/.leach ofwhich may be supported at thegjlower end a Y .resilient roi/31 depending from che member le or aplateg32-iixedthereto.. -Ae

Shown in `Ifigs2 and "5, the'dogs-BO of each E1-pairearedisposed upon opposite sides of the eleinent-sfllS-and normally project belov7 their :lower edges, ythis f'arrangement ypermitting the dogs ito ride thel guard-elements v13y wheny mOVednpWardlyl and to release them When ,acted upon by the"connecting'devices 28.y To

facilitate these' `Vl`operations,the, opposing -facefi of lthe'dogsz() are beveled as shown i .-at33 andlilikeyvisethe elements-13 have,

l 'beveledportionsin line WiththedogsBOl.

" AOt the`r automatiestoppingmeans 24, `24" f indicatesia rod extending longitudinally of `Tand sflidably supported on ,the outerfsurfa lWhich projects through, an,V opening l` formed in the4 adjacentupright l? and also #rotate them at the same rater ofjf'speed,L therea,

*by inovingorpropellingthe opposite *ends` A120 oftl1e'n-priglit"la yadjacentto themotor 2l,

" preferably by t t straps 24X.

zendytherck d2tEL is providedvvith an arm: 24?

anv opening ormedrin the Wall .7@ into ythe y pathof movement of the yguard Velements .13;Y .il-Near its loiverlend, the rod. Maisie-provided with a' a second ,l arm 24, which "projects-f through ain-opening 1X formed j in ,thel upav kkrigliu-l-and angopeningd formed' in the Iments l-3" areL moved-c` from the] position wall into the,path of movement, ofthe 7 sliow'nin Fig.V l downwardly-into operative VV"positiorfi thelowermosbguard .elementi 13 ngagethefarmi? and, movie itdownf e.

Teste/Fig 34am itin turn Win-gna@ ,roch-29;?- s moved `inone*direction, orjthef` operated or ffon positionback into r neutra Afp vsit0117 and thus "Stonthe moto? 21.1 Fig. l, the brush carrying framerr` 'shown in neutral position".V It'- the Near its upper -tliatftheyare` maintainedf'in `'parallel relai?. n yltionship. By-eansing'f each 'guard 'elementf-y i( Cto effect the engagement of the' nextorsuc-r` -L` ceeding guardelementu with' the screvvft' e threads loof theft-eedlscreivscorshafts, they p 1Vbf-ieeiiie uniformly'spaced,asftheypmoveinto 4operative posit-ion;VK y, "fngfmy vconstruction I'provitle a sufficient kthe :rodff24aidjovvnyvardlyiandxlthe"armi-.24522 l intoilposition to be acted fupojn; byjthe guard"y e elements lyvhen they.- yarelrlnoveyd up'Wardll'yi1y e or in the; opposite direction. f-Neainitsil'floiver f endl,,therod.24a is provided vWith-[apairfofj .spaced tappets 36,136a,-projectingflaterally,L. preferably in'ja direction' 'oppositezpto the arms 24H-24250 thatone or the other there otwillen'gage a Vprojection 37carredgbyfff the brush-marrying" frame 23. YWhen the4 i other, yfas; just described, `itwvilllcauser-.the

brush" ,carrying frame 231e move from-V.

y n e e A trarne2,3 is ,osellatedj,.cl-ockwise, /the, projeetion will be rpositionedfin thepathpyofXnoveinent7^ ot the tappet 36. y .,AccordinglyiWhenQ-thei i tappetv v6V is operated by'fpthe dovvnyvardi; v movement of gthe rod 2451,'` "it `will "n io'vey the i' `iframe 23 backinto jthef Vposition Is/liovt/n .Y Fig This operation will Inove the ftappet l 536 tothe position shown inlFig.-3; ,then

it' the frame 23' is oseillated to the position Y shownv in this'flast mentioned vie-vv, thelpro? 'jecton will be positioned inthe pathof- :movement of the tappetfk, so lthat when th'erguard'"elements 13 reach their limi'tfo movement inthe upward direction, they Willffjact through the arm 24h," rod4 24"?, tappetlfv` *and*V projection 37 to movey the framewfro'rnf" itsfoniposit1ontoits neutraly position, as.

shown .inf Fig. l.

` f From thetoregoingfdeSCript-ion'yit will be Seen that the guardelementsfinay be readilyA moved` from either position 'to the' lotherf" .Eofsitioin and yvliensetiill motion,theyWill "e automatically,'stopped upon reachingthefposition towards whichyfthey are moving-j It will also be seen'fthat by providing n Vfeed kscrevv' with which vthe "guard elements A f have screvvethreaded engagement,V vthey'jniay lU01 y be propelled in either direction in a'poffai-k .tivemanner; Furthernioray ,this construe; e tion'servesj 'to lock the guard yelements against movement along the feed screw,

the guardelements at: the saine` speed so numberof guard.' elements-'so that ivhelifitheyie .are-fpositioned to, guard the .QpenifngQg the-fi Vatlpnints:between v the i side edges: o, 'Y i ngq/feutilize them itssupplhentzilignerdl' rlgopenin'gs' v-trtive and erenot;1r intended to 'be in' tati'nf e 2i In apparatus of therohiss described, the

spacesaebetween themn'n will:V .beef es size: to"Y from entering?betweenv' `infsaid chamber'forengaged Wit-h the threads of sad screw threaded' sections,v whereby prevenif n: pers them;N y Byi speen the Iconnecting; devices? fillus. any' and' thel diselosures .herein| are purel) isenselimitingi, j VVhnt-eleann is:

` Vl: In apparatus() having sereivL'tli'ife-ntled seCtion"extendingV 'freni endi to end 'of the`l Openingfend un 'untlireaidedJv section ezending Hintoj' said' chamber;agplnrality 'of guurdfeiements hnvj ing serenf threaded openings 'slidzibly fitting the@ v` u'ntlirend'ed1 sections ot'f` said shafts whereby 'they may be; v nested in' 4veonipnet/ relati'onship fin` saidehfiinber' withy the th'reidsfot'- snidsere"\ threaded sectio'nsgfwhfereby' they may be propelled int o1 rative positioinrlendmeansfor/r0- Combination withV i frame- Work forming 'an opening ande ehninberntene' endet the opening ot` a'pur ofvr shats disposednt opposite sides of said opening', each shatt. having n' screw threaded section extendingw vfrom end to en'dmoffthe opening and an Unthreaded section extending; into said y chamber, 2t plurality of guard elementshav` their,movement in. 'oneI direetion. Y

3;A ln nppnratusbf the class de ser1bed,1the yc:on'ibinzitvioii withA eyfrnine Work forming`- ing iserew threaded openings slidably rit,`

` ting the-Unthreaded seetionsfot 4seidv Shetts whereby they may be nested' in Vcompnet relationship 1n vsaid chambern on engaged with the threads of said Soren' threaded i sections, whereby they mayV bev propelled intooperative positionymea-ns fior rotating said shafts, endfmeans for .stopping the rotation of Athe shaft Whensaid gunrd ele-1 ments reach n. predetermined position in nopening andr a ehnmbernt oneY :endl of the opening` oi :i-Qairl'o shafts dlsposedat opposite ,sldesv of ,said -opeinngg V eaeh shafty `hevinfr e screwthreadedf section vextendin 1 threaded section extendingvinto snid'eham'* bergil'e plurility of guard elements having if "giro theolasstldeseribed,` the"l combination Withderrame* :Work torining an A unthreajded i 'seetion'sv ot:` said shafts? whereby.'

they-may be" nestedineompact :relationship .f

theyimuy",befpropelled .into operative posi-A tion,'v means forv rotating" said shafts; fnndl-f in either4 direetionfr I el. iin*A .apparatus o'flth'efelass described, the" i eon'ibin'ntion With ai frameworktormin'gaif threadedfseetion extendinginte' i said ehnml her; nl plurality" eign-ardeleientsf` having" threaded openlngs'rshdbly 'fitting-the\y unt ser-mv threaded seetion'S,-A -Wh'erebiIVA they may be propelled into operativepsif tion',`f1iienns for rotating saidsihiftsinnd vineens tor feeding sald'fgu'irdl elements Asueeessively into engagement with' the screw combination Withe frame Werk forming; an "l posite v sides 01"' said? opening,A each shaft hav-V ing n screw threadedA section extending from end rto end ,et the' 'opening land an Unthreaded sectiony extend-ing into vsaid chamber7 n plurndityfoty guzird elements 4having screw threaded open-ringsslrdnbly fitting" the" uni they nitty. benested in' 'compactrelationshipvw in seid ehninbe'rf oi engaged 'with the th'ren'dsf yI o'tsaid serew'threa'ded sections, Wherebyth'ey may be propelledT into operative'v position;

,ineens toiifot'ating'snid shafts, and-'means tot feeding lsind guard elements successively into engagement f with the fserewf threads'v of tioijied -ni'eansrcomprising' devices for releasnbly`l'iolcling sind elements in sn'idchninber isnid-serewthreaded sections," said-flsti menand connections between? said elements' oper# f nt'ing-'toetfeet their vrelease from sniddeviees successively, i Y

6; In'npparatusof the class described, the the 'combination ot zi trame worltormingen euch shnft'fhnving" 'a 4screw' threaded section 4entt-indin'n't om 'end to endet the opening end nn u'nthreeded;section extending beyond" 'one-end thereoifgn plurality-o1"- guard ele- "'mentsha'vingiserew threaded ogeningsy slid? able dnltheun threaded 'sections of saidfshafts- Vand niriniged toengug'e the threaded sections 1 whereby said elements 'areapropelledorf' y moved across said opening tofform aguard" l therefor, devices for releasably holding said.. elements iii nested yrelationship along;` the und-.

, nectionsbetween"saidjelements operating to. fieect disengagement* thereof 'from f holding'means oneafter another as they are #fed acrosssaidopeningj o l threadedV sections of said. shafts',` and con- 7; In apparatusof kthe class described, theY combination4- of p a4 v:frame work forming -y an 'openingto be guarded, a Vpair of shafts dis- `1posed',` along opposite'sides offsaid opening,

and arranged tio .engage `the threaded sections thereof, vmeansy for @rotating said .shafts wherebyV said elem'entsv are propelled or li 'moved-across said, opening toform a guard therefor, 'a pair lof :yieldable devices 'for reg leasedlyy xholding said elements in` nested .re-

ilatio'nship yalongthe unthreaded sections of saidf'shafts, andA connections between said elements operating to effect disengagement thereof fromfsaidholding means one-after.

another as they are 'fed' 4across `said opening.

- combination; of? a vframe' .work forming an `opening tro-ble guarded, ay pair of shafts dis# osedlfalong. of aosite sides of said o enin each.v shaft having a screw threaded section extending from end to end fof the openingk and an unthreaded section extending beyond one end thereof, a plurality of guard eleinentsliaving screw threaded 'openings slid? able on the unthreaded sections of said shafts and arranged to engage the threaded sec--v tions thereof, means for rotating said shafts Vwhereby said elements are lpropelled or moved lacross said opening to form ahguard therefor, devices Vfor releasably holdingY said elements innested relationship along the ulithreaded sections of said shafts, and foldi vableliiilrsbetween said elements operating combinationwith aframe-work forming an rtofifeffect disengagement thereof fromv said I f holding meanspone after anotheras they'` are fed acro'sss'aid opening.'` l n V9. VIn apparatusof the classdescribed, the

'openingand a chamber at one end thereof, of

a pair of feed screwsdisposed at opposite) sides of said opening and extending from end to end thereof, a plurality of guard elle ments ,havingy 'screw threaded engagement at ytheir opposite ends Vwith said feed screws,

means forfrotating said feed screwstojmove v. said guard'elements into Voperative relation to said `openingto guard it or intosaid i chamber, connections' between said guard elements, and, meansin saidfchamber cofactingwith said eonnectonsto control vthe dei said liverybf said elements tothethreads i of .said

feed Jscrews, 1 whereby said :len'ients `are unifoirinlyl spaced along said feed screws when t moved intoy guarding possitioii. j rv` a-ii opening',yof an auxiliary frame fitting"k said opening and co-operating. with@ said Y ,c frame-,work to' formv a chamberfat one end thereoffa pair of feed screws disposed at opposite sidesfof said opening and'extending vfrom end to end thereof, 'a plurality of guard elements having screw threaded engagement at their oppositeV ends `with `said feed screws,

means for rotating saidffeed screwstto move :said-guard elements into operative:relation to said opening to guard it' oiffpintdsaid chamber, connections between saidA guard elements, and means insaid chamberico-acting with said connectionsto control-y the de-V livery of said elements to the theadsof vsaid feed screws, whereby said elements arefiini- 4formly spaced along said yfeed-screws `when moved intoguarding'position. i

. 11. In apparatus of theV class described,

the combination withv alframeworkforming an opening,of av cross member' at onelendof said opening and cosoperating:y witlif isaid framework to form a` chamber, .alpair of l VVVfeed screws disposed atzopposite sides `offfsaid g 8. In apparatus of the class described, the

opening-and extending from end' 4tofend thereof, a vplurality of guard-elements #having screwy threaded .engagement at 'theirs op- Vposite ends with? said. feedscrewsmeansifor rotating said feed'screwsto move said guard elements into operative rela-tion to said opening to guard it'or intosaid chamber,

connections between said guard elements, Y

and means in said chamber coacting with l'said connections to control the delivery of y ioof the combination with'a frame-,work forming i n an'openingy to beguarded, anda chamber at' one end thereof, of a pair of feedfscrews dis? Y posed at opposite sides of said opening andi;

extending from end to end thereojha plu- Lrality of", guard elements having screw threaded engagement at their opposite' vends with said feed screws, means for rotating said feed screws to move said elements into opera-y tive'relation to said opening tof guard it or(r` into said chamber, and spaced connections.; between said elements serving to restrict the Y spaces between them. 'f n' Y y 13. In apparatus of the class described,

the combinationwitha framework forming an opening to be guarded, and a kchamber-at one end thereof, of Aapair of feed screweidisposed at opfposte sides of said openingy and eXtendin i rom end to end thereof, a y'plus -fiility yo guard elements "having screw' threads `of said-,feed screvvsjvvhen being -moved into position i to guard saidl opening.

.14. In apparatus of the class described, the

combination with `a framework forming an opening.v to1 ,heV guarded, and a;k chamber; at one lend thereof, ofza pair. of feed :screw-s disposed at- .k opposite Vsides -of'said opening and `eX-r tending 'from endl to eiidf thereof, .al plurality ofguard elenientsiliaving screw threaded. en#

fgagement at their ,opposite len-ds With said `feed screws, means for rotating. said :f'feed screwsftomove saidielements into operative relation-'to said opening to guard :it vor into said-chamber, vmeans for controlling the de- :liiveryofasaid `Velements from said chamber .tinto eng-agement :with the threads of said feed screws When-being moved into position l1?? to gua-rd said Opening, and y.means .for stopping said lrotating means when said guard .elements reach a predetermined' position.

durii'ig movement lin.. either direction; Y

@15.In Yapparatus of the class-described,

`7 'v the'- combination Withaframe work forming .an opening toi-be giiarded,.ofa pairof isup- ,port-ing devices arrangeda-long two` sides of -thexopening -gii-ardelements ,supported lat their opposite; ends vonf said 'devices and arspaced relationship.

lfixed `my signature.

1 desd-,1:34

..ranged. gto 'loe 4disposed finvnested relation.at

one .side :of the opening, means operating.. to

-suceessively engage said elements :in their :nested position and move eacli relative tothe vadjacent.element into vspaced relation thereto and to-move all'of the.: elements so engaged land fspacedfaloiig said devices to arrange '..t-hem7in operative relation to thezopeninv, said means comprising screw-threads oii saidy supporting devices ittingithreaded openings v formed .in the opposite ends of said .ele-- ments,;and.-means serviiigzto space sa'id'elements relative to .each other as 'they are :moved from.v a .nestedrelationship into 16. Inapparatu-sof the class described, -t-he, combination with a frame 4Work forming an openingtobe guarded, -ofalpluralityvof ,gua-rd eleinentsdisposed :transversely of said opening and arranged to, henestedzat one jside. thereofi means yfor support-ing the opposite rends of said devices in 'iiestedjirelation 'and for moving them .successively Afrom/their y.nested-,rela tion relative to the opening, :and

means cos-.operating with .the movingyele- Y nientsof the last mentioned means .foref- -.feeting and controlling the successive movement .of said guard .elements lto uniformly space the :latter when engaged by the `moving elements. of` said supporting and .moving means:

'Intestimony whereof, I have :hereunto af- AALGUIN nQKiN'rNi'in.