US2326376A - Welder's hood - Google Patents

Description

I Aug. W, 1943 ,F.. E-i. MARKGRAF, JR, ETAL 3 WELDERS HOOD Filed Feb.. 17, 1943 2 Sheets-Sheet 1 JOSEPH M, FAY.

RTTORNEYS Aug. 10, 3343.

F. H. MARKGRAF, JR, ET AL WELDERS HOOD Filed Feb. 1'7, 1945 2 Sheets-Sheet 2 INVENTORS FREOR/C H. MARKGRARJQ.

, J'DSEPH M. FAY

provision of a hood that may be quickly :raised a locked position leasable :for return to the a ofthe wearer. V

of a welder, and which headipi covering the welders face to a Patented Aug. 10, 1943 I UNITEDSTATE-S PATENT rorric-E; I I] f f 2,326,376 f j I :wELnERsnooD Frederic E'Markgraf, Jr; I San Francisco, Calif assigiiors"ohone third Francisco, Calif: APpIicationiFebi-aary 17, lsrazseriai No. V "12 Claims. (Cl."2 -c'8) 1 to Ronald Muller, San

This invention relates to a'i welders :hood.

and iloweredibyca welder without necessitating the use of the welders hands and which hood, 5 when in lowered operative position foriprotecting the face and eyes of the welder, is positively lockedin-suchposition. i v Another object of the invention is the provision of an improved hood having means releasably locking the same inposition over the iace of the welder when the latterliswelding, and

-which hood carries means iactuatable'py down- Ward movement of the jaw of the wearer for rel-easing'ithe' hood forilnovement of the hood: under a source of power to an elevated position uncovering the wearers Zface, .said hood being held by said source when in said elevated position; "i A still further object of the invention is the' provision of an improved welders hood that is spring urged to andfisxyieldably held, in an ele- I V vatedposition over.- the head of a wearersoiasito permit ,unobstructedvisinn :to the wearers eyes,

is adapted to be swung fromE' such position against the tension ofia spring to in which :the hood is over the face of the wearer, byr a'sharp nodiof they head and-from which latter position .thehood is reelevated position by means actuatable by movement ofrthejlower jaw An additional object is the 'IJIOViSiOiIOffE head hand of head piece adapted to be carried by the co pivotally gg from a position position-overthe headgot the welder in which latter position the supports a hood for swinging ,face is uncovered, said head-piecer including a chin strap adapted to cause actuation of means 24 for pivoting the hood to a position over the head of the welder, and which chinstrap is so associated with the hood andjhead piecelas to cooperate therewith for stabilizing the hood in all positions thereof. and during itspivo'talmove- '45 ment, and whichstrap 'is also connected with'.the head piece in, a manner to prevent accidental movement thereof away from the position in Will Chit is actuatable by'movementof the chin.

In conventional welding hoods, the main hood.

portion carrying the glass or plastic covered window opening is pivotally supported-on a head band for swinging to and from substantiallythe 'same positions as the hood hereinafter described,

vention the ih'oods is upper portion of Q and Joseph Moray; "f

, -hood i ns vseveral positions." To raise, the "1150a V p the welder must; use one hand -thus eithenrleasing the rod or the piece of t .orln Inpreoarious situations, as :on high. buildings or ships::masts,

or 'scafiolding, etc,, it-hewelderfrequentiy must hold onto asupport with-one hand: and hold the -=rod with the 'other.-: In many instances when the welder releases-his hold onra support toliftithe hoodgih'e lo oseshis balance or is blownioflf balance'and is fatally injured or ofthe hand; c

In conventional hoods, the latterare not on-' since friction wjointsiiare used: With our inthe hood cannot accidentallyifall oifl-the" wearers means; a V

' WVeare awar'eof ithefact thatl mean's oft-various ekinds have been developed 'for'raisingiandrloweringxth'eleye glass portion of the hood, and that 3 various couhterbalancing means have also-been used in eifortsto facilitatetmoving the hood,':but

in-rsome or all of these-prioriatterhpts of which we are aware, either the mechanical complexities have :proven unreliable andobjectionahle, or else the hoodhas been too heavy {or new objections such as-undesirablerexterior projections and restrictions intheidesired manner 'ofoperation of the hood have been introduced. 1" V In the drawingaFig, '1 visa' ivertical sectional view through' a' hood when the latter-is in ope 'erative face-covering position, and the hood is indicated in'dotedashlines in inoperative position. The headpiece within'the h'ood is in elevation and partly broken away.v

i Fig. 2 is a fragmentary elevational view' 'o'ff the the hoodwith one of the eX-- terior elements (spring case) broken away and 1 partly in section. I

Fig. 3is an enlarged -fragmentary*elevational View of the hood'actuating elements at one side but friction means is provided for holdingthe of the head piece, the elements being indicated maimed;- -In1-even j the'most favorable 'c'ircumstanceg iaccidents occur by reason OfthGiIiCSSitY for'lthepvzelders, releasing :one hand or the .othersto liit-thehood. i With'the mask of, this invention the hood is under the full 'zcontrol of "theswearers head'ior lifting and loweringithe'reoflthus eliminating the, hazard encountered in hoods requiring the use positively held locked in face hovering position irrespective of how the headis tiltediorimoved, and with'this invention prises T an annular bandfi niayqbe connected ends together by a bolt 1,

7 remain stationary on' gthis swinging ofthe hood. r

cept for the head purpose of so swinging thehood is to in dotted line 'behindone circling band.

" Fig. "4 is a plan viewof the portion shown in Fig. 3 with the body of the hood being indicated Fig. 6 is a fragmentary sectional view taken" along line 6-6 of Fig. 5. p p

In detail, the main body portion I of the hood itself may be substantially conventional in shape,

having a' horizontally elongated window opening carrying the glass'elements 2 that arenormally in front of the eyes of the welden. Preferably the upper end of the hood is covered by a rearward extension 3 that extends over the top of theiwearers head to afford, protection-to the head which feature is not'used'in conventional hoods; Also a rearwardextension 4 at lower end ofthe' hood will extend below the wearers .chin to protect the throat and-chin. Within theiconcave side of the the level of, the glass 2 is ahead ipiece'that com- V I band '5 that is adapted to encircle the head and closely fits the latter, while a at its ends to band 5, thezb and 5 extending .over. .may be in .onestrip withoverlapping ends, re- ,spectively slotted for adjustably securing said and which bolt may also extend through a slot in the'end'of band 6,

thus enabling the adjustment of the head bands to various sizedi heads.

.This feature is old in welding hoods generally, and is'therefora'not shown in detail."

The hood I is pivotally connected'to band by horizontally aligned pivots respectively positioned at opposite sides of the scribed more in detail. Thesegpiv'ots support the hood for swinging from thefull-line' position in Fig.11. tothe position 8 indicated in dot da'sh -line,and vice versa. The head band itself should the wearers head during ;'It is highly desirable that the entire hood (exlpiece) should swing since the enable the welder to observe his work at intervals, and unless the entire hood is lifted, the hood would interfere with the .vision. This interference with vision is one ofthe main 'objections to previous:

attempts to 'merely. 'move the glass away from the window opening.

Referring to Figs. 3, 4,. a'pivct means, such as a bolt or shaft 9;:pivotally connects one side l (Fig. .3) of the hood with the head band 5. The bolt 9 may extend through the side] and through a reinforcing plate II; that is secured to said side. ,Asleeve '12 in the aligned :openings in side l0. andrplate ll through which bolt 9 passes encloses the olt and is secured between nuts l3, M. The sleeve spaces the nuts so that the side H and plate l3 arefree torevolve on thesleevel2. 1 if The plate ll 'may be-tightly-secured to the side [2 by any suitable means, such as by rivets The-inner end of bolt 9 (the end inside the hood) carries a metal plate l6, stiffener piece l1 andoneside of head band 5, whichplate, piece and-band are securely .held together and rigid hood and above the head. .The band 5' A latch, arm 25 belt or pin 26 that is positioned forwardly of bo t stiffener piece arm 25 being positioned on the opposite end of side bf the head en- 7 on bolt 9 between a nut I9 and the'head of the bolt. Also, rivets 2|, or the like,-may secure the plate, piece, and band rigidly together.

The plate I6 is on the side of the piece l1 nearest the plate II and carries projections 22, 23, 24 projecting laterally toward plate ll (Figs. 3, 4).

i ,pivotally supported on a 9 with respect to the forward side of the hood, said bolt 26 being secured to the plate l6 and to IT at one of'its ends with the latch the bolt between plates l6, H and adjacent the former;

Projecting inwardly of plate H and extending V transversely across the upperedge of plate I6 is a 1 pin 21 that is rigidly secured to plate I l and side and over the pin ll. element 28 is formed with a downwardly opening .recess 29 (Fig. 3) that and the side of the band I8. This pin 21 is positioned between bolts 9, 21 and at a level somewhat above that of said bolts.

An extension 28on arm forming'a latch element extends in a generally upwardly direction The underside of the latch is adapted to "receive the pin therein upon. generally downward swinging of the end 28, thus locking the plate l6, piece l1, that is adjacent the latter against rotation relatively about the axis of -bolt 9.'

This locking relation above described is maintained by a spring that is secured at one end thereof to .bolt 9 and that engages arm 25 forwardly of bolt 26 at its other end. This spring .isheld bowed under tension-by the bolt26, over which it passes, thereby constantly and yieldably hood as will be later de- 'urging the latch end 28 of the arm to a position holding the recess 29 in the path of travel of pin H. The projection 23 on plate It functions to hold the latch end 28 in said position when the latcharm 25 is released from a downward pull thereon whilethe projection 22 on said plate limits the upward swinging of end'28 when the latch arm'25 ispulled downwardly to release the pin 21 from recess 29. The upper edges of plate 16 and stiffener I! extend transversely and slantingly upwardly across the pin 21 adjacent projection 23 for stopping relative movement of the 5'0- band 5 and hood at one end of the movement of pin 29 and when the pin is in recess 29.

, A pin Or bolt3l at the forward end of arm 25 secures one end of a chin strap 32 to said arm. The strap 32 is provided with a-f row of openings 33 for said bolt to provide for adjustment of the strap, said bolt being adapted to extend through any one of said openings, and a friction washer 34 is provided to maintain a predetermined frictional resistance to rotation of the strap on the bolt relative to arm 25 so. as to hold the strap inany desired position,-such.as under the chin of the wearer. 7

The projection 24 on plate acts as a stop for engaging the pin II when thelatter is released from recess 29 in the end 28 of the arm 25. Thus, upon such release of said pin, the hood may revalve to carry pin ll through about a arc, or utnil said pin strikes projection 24. Upon swinging the hood back to the position shown in Fig. l, the pin will engagethe cam surface 35 (Fig. 3) of latch 28 to raise the latter for passage ofthe pin to below and into recess 29 where the latch will hold the pin locked in the recess 29 until the arm 25 carrying strap 32 is pulled downwardly for releasing the pin. 7 Y

sudden stoppage of the" torque iorce amnesty;

plvoting. of thehoodon; the headband; Byr's'topping :both sidesiof :the hood at the same time,

there is no;undesirable strain'on the pivots;

Having described the'invntiomwe claim'z'i 'i T 1; Ac welders hood, a head-fitting member on 1 which-said hood is, pivotally supported for swingingffrom face='covering position :to an elevated position over the head'of thewe re a mechanism forrreleasablyilockingisaid.hood to said member when the hoo'dis in face-covering position and movable to a: position releasing said "V -hood for swinging of 'theg'latter to" said elevated position, andmeans connected with saidhood automatically'actuatable'upoiisuchmovementcf said meohanis'miorswinging said hood tosaid elevated position.

2. A welders'hood, a head-fitting member on wnichgsaid hood is pivotally supported for swing ing from Tape-covering. position to an elevated position over the head of the wearer; amechanismi-or releasablydocking "said hood: tosaid member whenlthe. hood is in face-coveringflposi tion and movable to a position releasingsaid hood for swingingoi the latter to said ele'vate'dposi- ,tion, and-means connected with said hood' automatically actuatabl-e upon such movement of said zjsaokve when :the latter are "interlocked for so "swinging said hood upon movement ofsaid elements'to said unlocked position; a chin strap engageable with. the lower jaw of a wearer and connected withsaid elements for causing'said movement of the latter to unlockedpositionupon downward movement of saidjaw;

'6'. A welders hood, ahead-piece pivotally supporting said hoo'd for swinging thereof on said head piecefrom faceecovering position to an ele-' vatedposition over the head of the wearer, inter.-

- locking elements on said head piece and-on said mechanism for swinging said 'hoodto-said'elw vat-ed position; andforholding said'hood in said elevated position. s

1 A welderfsihoodfa headditting memberion -which saidlhoodis pivotally supported for swing-.

ing from face-covering positionto an elevated position over-the head of the wearerya mechanism for releasablylockingsaidhood to said memberwhen the hood is in. face-covering posi- -tion'and movable to a position releasing said ho-0d forlswinging of the latter to said elevated position, and a spring helcl'iunder tension hyfs'aid mechanism and connected with said hood automatically actuatable upon such movem'entlby said v n mechanismlfor swinging said hood to saidelehoodres'pectively for holding said hood in said face-covering position and movable relatively, to unlocked position'releasing said hood for swinging of the latter tojsaid elevated position, aspring connecting said hood and said head piece and held by said'elements under tension when the latter are interlocked for's'o's'winging said hood upon move'nientof said elements to said unlocked position; a chinstrap 'engageable with the lower jaw of a wearer and connected with said elements for causing said movemcnt Of the latter to unlocked position upon downward movement of said jaw, stopfmembers on said hood and head piece for lirniting swinging of said hood; to said face-coveringend. elevated positions. V

7. 'A welders hood, a head piece pivotally supporting said hood for swinging thereof on'said head piece from face-coveringposition to an elevated position over the head of the wearer, inter-' locking elements on saidhead pieceand on said hood respectively for' holding sai'd'h'ood in said face-covering position andmovable relatively to unlocked position releasing said hood for swinging of thelatter to said elevated position, a spring connecting 'said hood, and said head piece and held by said elements under tension when the la vated position, said'spring being arranged and adapted to yieldably'hold said hood in said elevatedposition. Y I

4. A'welders hood, a head-fitting member on which said hood is pivotally supported for swinging from face-covering position' to'an elevatedf position over the head of the wearer; a mechanism for releasably locking sai'd hood to said,

member when the hood is in face-covering position and movable to a position releasing said hood for swinging of'the latter to said elevated position, and means connected with said hood automatically actuatable upon such movement of said mechanism 'for swinging said hood. to said elevated position; said mechanism including a latch pivotally supported on said member and an element on said hood engaged by said lat ch,'said latch having an extension connected therewith Yter are interlocked for so swinging said hood upon 'springasdesiredh i t'8. Awelder.s.hood,a head-fittingpiece adapted -to. stationani ly fit on they head-of the -wearer,-a 5o pairgof-ooaxial pivots carried bysaid head piece connected with opposite sides .of-said hood and pivotally supporting said hood for swinging fromfacescovering position to an elevated position over 7 thehead of the wearer, a'coil spring connected at its ends with said head piece and hood respectively' for so swinging said hood; means for'varyengageable by the lower jaw of the'wearer for causing movement of said latch from said element upon downward movement of the lower jaw of the wearer.

5. A Welders hood, a head piece pivotally supporting said hood for swinging thereof on said head piece from face-covering position to an elevated-position over the head of the'wearer, interlocking elements on said head piece and on said hood respectively for holding said hood in said face-covering position and movable relatively to unlocked position releasing said hood for "swinging of the latter to said elevated position,- said hood and said head a spring connecting piece and held by? said elementsunder tension ing the tension of saidspring, a-latch'releasably locking said hood in said face-covering-position from movement of the hood under the force of said springto said elevated position, a chin strap connected with said latch for." actuation of the latter to release said hood for said movement upon downward force of 'the'lower jaw of the wearer against said chin strap. T

' 9. A welders hood, a head-fitting piece adapted to stationarily fit on the head of the wearer, a pair of coaxial pivots carried by said head piece connectedwith opposite sides of said hood and pivotally supporting said hood for swinging from face-covering position to an elevated position over the head of the wearer, a coil spring connected at itsends with said head piece and h'ood *respectivelyffor sojswing'ing said hood, means for .,,varying the tension of'saidspring, a latchreleas- .ably locking said hood insaid face-covering position from movement of the hood underthe force of said spring to said elevated position, a chin strap connected with said latchlfor actuation of the latter to release said hood for said movement upon downward force iof the lower jaw of the wearer against said chin strap, said latch including a latch arm pivotally, supported on said headpiece intermediate the ends of said 7 arm, one end .of said strap being connected to one end of said arm, a hook on, the opposite end of said arm and a member secured to said hood adapted to be held in said hook'when said hood is in face covering position and the jaw of the wearer is substantially closed so as to free said chin strap for upward movement thereof.

10. A Welders hood, a head-fitting piece adaptedto stationarily fit on the head of the wearer, a pair of coaxial pivots carried by said head piece connected with opposite sides of said hood and pivotally supporting said hood for spring connected at its ends with said head piece and hood respectively for so swinging said hood, means for varying the tension of said spring, a

latch releasably lockingsaid hood in said facecovering position from movement of the hood under the force of said spring to said elevated position, a chin strap connected with said latch Ior actuation of. the latter to release said hood for said movement upon downward force of the lower jaw of the wearer'against said chin strap, said '20 swinging from face-covering'position to an elevated position over the head of the wearer, a coil said swinging-of. thehood and actuatable by downward movement ofsaid element' for releas I ingsaid hood forsaidswinging offthelatter, said 4,; hood being s'wingable on itspivotsitosaid face I covering position-from said elevated position by the inertia of a relatively sharp forward had of the wearers head, and power means connected". with saidhood automatically actuatable upon release of said hood when the latter'is in 'faceflcovering. position for moving said hood'to said elevatedposition thereof.

' 12.*A welders hood pivotally supported-on a head-fitting member for swingingfloi, said hood on said. member from face-covering position to an elevated position over thef'wearers" head, a chin engaging element adapted to'ejngagethe under f .7 side of the wearers jaw when said memberi is hood being swingable on its pivotsflto said facecovering positionfrom saidelevat'edipositionbv the inertia of a relativelyfsharpforward nod of means for varying the tension of saidspring comprising a housing rotatably supported on one of said pivots and enclosing said spring, one end of said spring being secured to said housing and the opposite end of said spring being secured to the pivot that so supports said housing saidilast mentioned pivot. being secured rigid with said head piece.

11.'A welders hood pivotally supported 'on a I head-fitting member forswinging of said hood on said member from face-covering position to an elevated position over the wearers head, a

I chin engaging element adapted to engage the under side of the wearers jaw when said member fitted on the .wearersihead for downward move 'ment of said element upondemand movementof i said jaw, a mechanism connected-with said ele-- ment and with 'said member releasablyholding said hood in face covering position against said swinging of the hood and actuatable bygdownward movement of said'felement for releasing said hood "for said swinging of the latter, said the wearers head-,jand powermeans connected with said hood automatically actuatableupon re- I lease of said hood'when the latter is'in face-cov N 'ering position formovi'ng said hood t-said.e1 e-. vated positionithereoi, pivots" supporting said 7; 'element for swinging to and from a: position under said lower jaw, and meansfo'rholding said element against accidental swinging thereof when the elementis in position under said lower 'Jaw; g

t FREDERIC HJMARKGRAF; JR.-

V JOSEPH M. 'r AY;

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