US2416764A

US2416764A - Welder's helmet

Info

Publication number: US2416764A
Application number: US516656A
Authority: US
Inventors: Madson Harold Roy
Original assignee: WELDING APPARATUS Co
Current assignee: WELDING APPARATUS Co
Priority date: 1944-01-01
Filing date: 1944-01-01
Publication date: 1947-03-04
Anticipated expiration: 1964-03-04

Description

March 4, 1947. H. RjMA'DSON 2,416,764

wELDER's HELMET Filed Jan.V 1, 1944 2 Sheets-Sheet 1 H. R. MADSON 2,416,764

WELDERS HELMET March 4, 1947.

2 Sheets-Sheet 2 Filed Jan. l, 1944 ,4 a? zm,

, tion Patented Mar. 4, 1947 uNl'nt-:p STATE s *PATENT orifice WELDERS HELMET y arold Roy Madson, Glen Ellyn, Welding Apparatus Company,

The present invention relates to a welders helmet having a swingable shield pivotally connected to and supported by a head harness tting thehead of the operator, and carrying a lightiiltering lens, and also having means for opening and closing such lens by a movement of the operators chin.

Among the objects of the invention is to provide a novel chin operated lens actuator which is normally located beneath the chin with a small clearance for allowing a given small amount of free and natural movement of the chin without effecting any movement of the novel actuator, yet being sufficiently proximate to thechin to be moved by the chin upon greater movements of the chin, whereby any desired opening of the lens will be accordingly effected to afford the operator with a free and unintercepted view of the work between welding operations, at which time both of the hands of the operator are free for handling the work as desired. Such actuator also comprises nlovel means for adiustably supporting they actuator with reference to the chin for the operative relations referred to above.

Another object of the invention. is to provide n ovel means which abuts against the chin for holding the shield and the lens means carried by the shield in suchposition in front of the operators face that the lines of collimation of the operators eyes will normally extend through the upper portion of the lens or through the upper portion of the lens aperture when the lens has been moved down into an open position. This novel chin abutting'means also includes means for adjusting the abutting means with reference to the lens means to effect the above referred to relations.

A further object of the invention is the provision of a. novel means for effecting a movement of the lens proportionately greater than that of the chin operated means when moved by the chin. This novel means comprises a lever arrangement. which may be of pantographic character, operated by a bow shaped lever which is pivotally connected to the sides of the shield and rearwardly of the operators chin, and with an intermediate portion of the bow lever extending transversely and forwardly of the operators chin. The chin operated lens actuator referred to above may also be connected to such intermediate porof the bow lever. From this intermediate portion of the bow lever forwardly extends a lens actuating element thus forming a leg of the bow lever. It is connected to the lever arrangement for moving the lens means. The point of appli- Ill., assignor to Chicago, Ill., a

2 cation of the chin with the chin engaging actuator is intermediate of the pivots or fulcra of thelever and the point of linkage with the lens means, whereby a given small movement of the chin operated lens actuator will be a-,fraction of the movement of the lens, thus requiring but a small movement of the chin for a larger movement of the lens effected by a simple lever movement and accordingly avoiding the complex and complicated lever systems heretofore found necessary, besides also eliminating the heretofore required large and extreme movements of the chin. By the present novel lens actuating means the operator ls able to have better control of the extent of aperture opening above the lens, does not need to move his chin to as great an extent as heretofore, and avoids the tendency to fatigue of the jaw muscles.y

The invention also comprehends novel conf necting means between the lens means and the actuating device for the lens, and also novel means for compensating for manufacturing variances. When making devices of the character disclosed, on a production basis, it is practically impossible to obtain uniformity of structure and relationship of the various elements of the construction. In the illustrative embodiment of the present invention the bow lever is connected to the sides of lthe shield by slot and pin means whereby the bow lever may be adjustably mounted to bring the lens actuating element secured to the intermediate portion of the bow lever into mid position relative to the lens means. At such position the just referred to actuating element is connected to a cross bar or balancing link pivotally connected to the lever arrangement for giving an enlarged movement of the lens means. Such link has an aperture of greater size than the end portion of the actuating element extending through such aperture to 'allow a certain amount of play in compensation for the manufacturing variances referred to above.

Another` feature of the invention is the provision of a novel lens means, and particularly the holder or carrier therefor. The holder is open at the top so that the line of viewwill be past the upper edge of the lens itself when in partly opened position, hence avoiding the heretofore frame bar at the top of the lens which bar confused the operator and often times gave rise to leakage of light by way of a crack below such bar and between it and the upper edge of the lens. By omitting such bar the required movement of the chin to lower the lens and its frame is reduced at least to the extent of the Width of such bar if it were used. The operator, by the present inventiomis able to obtain all the necessary view above the upper edge of the lens he desires by a slight movement of the chin `and, hence, a similar movement ofthe lens. It is not necessary to make the lens lopen so much as in the case when a bar is present because the view is obtained immediately over the upper edge of the lens without any confusion that would arise if a bar were there to cut of! the view.

The lens also is designed to overlap along all its edges the surrounding frame sides to prevent leakage of light as might otherwise occur .between an edge of the lens and the frame part at such edge. Also, the channels in which the lens and its carrier slide have means to so space the lens whereby as the lens is moved past the lower cross bar of the frame the lens surface will not contact with such bar and be marred or otherwise injured. as by scratching or the like.

Another novel feature is the provision of means whereby the actuator, when the lens is in closed position, is normally inclined a few degrees upwardly above the horizontal plane of the axis of the actuator lever, and is capable of being swung downwardly past such horizontal plane and a few degrees below it. In that way the component forward and rearward movement is reduced to a minimum.

Other objects, capabilities, advantages, features a'nd the like are comprehended by the i11-l vention as will later appear and as are inherently possessed by the invention.

This is a continuation-impart of my copending application Serial No. 410,751, filed Septembery 13, 1941, and PatentfNo. 2,339,280 dated January 18, 1944.

Referring to the drawings: l Fig. 1 is a part side elevational and part sectional view of a device embodying the invention; Fig. 2 is a fragmentary sectional view taken in a horizontal plane represented by line 2--2 in Fig. 7 of the drawings;

Fig. 3 is a fragmentary sectional View taken in a plane represented by line 3--3 in Fig. 1 of the drawings;

Fig. 4 is a perspective view of a detail;

Fig. 5 is a sectional view taken in a plane represented by line 5-5 vin Fig. l of the drawings;

Fig. .6 isa horizontal sectional view taken in a plane represented by line 6-6 in Fig. 1 of the drawings;

Fig. 7 is a part elevational and part sectional, with parts broken away, taken in a plane represented by line 'I-'I in Fig. 1 of the drawings; and

Fig. 8 is a fragmentary perspective view of the device.

Referring more in detail to the drawings, the embodiment selected to illustrate the invention is shown with a shield normally located about the front portion of the operators head to protect it during the welding operation.

The shield comprises a front wall I which covers the operators face,

side walls

2 and 3 for extending along the sides of the operators head, a top portion 4 for covering the forehead and an underlying portion 5 for extendingaboutthe chin of the operator.

The shield is pivotally connected to and sup-r portedl by a head harness, the latter comprising a head band`8 having its ends adjustably connected at the rear of the head by suitable clamping means 1. Over :ne top of the -head is a crown strip 8 having its lower ends suitably securedor fixed, as by rivets or the like. to the side portions of the head band 6, and having its upper ends adjustably connected by suitable clamping means s 'The

sides

2 and 3 of the guard are laterally spaced from the sides of the head band 6, and are connected to the head band 6 by friction pivot means, such as is shown in detail in Fig. 3.

Each friction pivot means comprises a stem I0 having ahead II lor bearing against the inner side of the headharness as at the juncture of the head band 6 and the crown strip 8. The other end of the stem I8 extends through a slot l2 provided in the side walls 2 and 3 (Figs. 1 and 3). The slotted portion of each side wall, such as side wall 3, is clamped between discs I3 and I4, the disc I3 being pressed by a flanged nut I5 screwed on the threaded portion of the stem I Il. and the disc I 4 being pressed by a washer I6 .in turn pressed by a nut I1 threaded to the end portion of the stem I0. Against the juncture of the head band 6 and the crown strip 8 contacts a washer I8 pressed by a spring I9 interposed between said washer I8 and the flange of the nut I5.

By adjusting the nut I5 on the stem I8 the spring I9 is compressed as desired to impose the to move the shield from in front of the face of the operator, it may be swung upwardly, as to the dotted line position shown in Fig. 1. The friction in the above described pivot means will be sufiicient to hold the shield in such elevated position, and to prevent it from falling or idling down, yet will permit a forced downward swing of the shield by the operators hand when it is desired to bring the shield again opposite the operators face.

'I'he front wall I has an aperture or opening 20 and a window structure with a movable lightlter lens. This structure comprises outer and inner window frames 2I and 22 in registry with the opening 20, the frame 2| having a ange 23 secured to themarginal or-border portion of the front I about the aperture'or opening 20, by suitable securing means, such as rivets 24. The outer frame 2l has an opening or aperture 25 which is closed by a transparency 26 of any suitable material, such as glass, mica, transparent compositions, or the like, held in place by suitable resilient elemen'ts 21, such as rubber, springs, or the like. A suitable gasket 28 may be interposed between the transparency 26 and the flange 29. v

The inner window frame 22 comprises a pair of .telescopically engaged

frame components

30 and 3| provided with openings or

apertures

32 and 33 in register with the openings 2.0 and 25, the telescopic engagement being by way of slidable and overlapping

resilient flanges

34 and 35 having any suitable means, such as registering projections and depressions for holding the components together. The component 30 is secured to a gasket 36, which may be of fiber or any other suitable material, by any suitable securing elements, such as rivets 3l or the like, the gasket 36 being in turn secured to the front wall by any suitable securing elements, such asbolts 36 (see Figs. 2 and '1) or the like. The gasket 26 has an opening 39 registering with the openings.

Between the

flanges

34 and 35 at the ends of the

openings

32 and 33 are disposed

upright channel pieces

48 and 40 for slidably guiding a. lens or light-filter holder or carrier frame comprising a lower cross bar 4|, vertical side bars 42 and 43, and

upper stubs

44 and 45 for overhanging the upper corners of the lens of light-filter 45 fitting within the frame members 4|, 42, 43, 45 and 45 (see Fig. 7). The frame member 4| has a depending leg or stem 41 which is slidable through suitable holes 48 in the lower` flanges 49 of the

components

30 and 3|, the

components

36 and 3| being elongated downwardly below the

openings

32 and 33 to provide space for the downward movement ofthe lens 46 and its carrier.

From the ends of the inner window 22, as the component30, depend legs 50 and 5| secured at their upper ends, as by

rivets

52 and 53 to the component 30, the lower ends of these legs carrying pivot elements or pins 54 and 55 for pivotally supporting

levers

56 and 51 extending toward the leg 41 and having slots 58 and 59 for receiving a pivot pin 6|! provided in or carried by the lower end of the leg 41.l Intermediately the ends of the

levers

56 and 51 are pivotally connected links 5i and 62 in turn pivotally connected to the ends of a cross bar 53. This bar E3 has a central hole 64 through which extends a chin operated pFn 65 for moving the cross bar 63 down and, hence, the lens or light filter 46. A given movement of the pin 85 will be multiplied through the

levers

56 and 51 so that a small movement of the operators chin will cause a great movement of thel lens 66.

At the rear of the frame part of component 3| is located another transparency 66 in a frame 61 having an aperture or opening 68 in registry with the

openings

33, 32, 39, 20 and 25 referred to above. This frame 61 has resilient flanges 69 vat its ends to telescopically slide over the sides or flanges 35 of the rearrcomponent 3|, and to be releasably held therewith by suitable means, such as registering projections and depressions. A packing or gasket 10 may be interposed between the` frame part 61 and the border of the transparency 66, the latter border being pressed against the border of the component 3|.

The device is designed so that when the operator is yin normal position looking horizontally through the window and lens the lines of vision will be through the upper portion thereof, that is, where the lens first opens so that the operator may see through upon the first opening of the lens even though such opening be but slight;

So that the window may be at the proper vertical height relative to the particular position of the operators eyes, the vertical slots I2 provided in the

side walls

2 and 3 of the shield afford a, means for vertical adjustment of the shield to bring the upper edges of the openings in the window and of the lens assembly about in line.

with the eyes, preferably slightly above the lines of collimation of the eyes. Such adjustment is made (see Fig. 3) by loosening the nuts i1 (at both sides of the device) and raising or lowering the shield, within the limits of the length of the slots i2, to the desired position, and then tightening the nuts.

In manufacture, the shield may not be uniform or symmetrical, as for example, the head harness might be sitting correctly on the operators head but the shield may not be vertical and hence 4the twoeyes of the operator may not look along a plane parallel to the upper edge of the apertures or openings of the window device. Hence, the adjustment of the shield may need to be made only ln respect to the slot i2 at one side of the operators head to bring the lines of collimation of the eyes into the plane parallel to the upper edges of the apertures, particularly the lens aperture, of the device.

Extending about the front and .sides of the lower portion of the operators head, as the lower jaw, is located a bow-shaped lever 1| pivoted at its ends by way of pivot meansv 12 secured to the

side walls

2 and 3 of the shield and extending through slots 13 provided in the bow lever. At the forward and mid portion of the bow lever 1| is provided an aperture through which Aextends the rod or pin 65 having a head 14 engaged with the rear side of the lever and a threaded shank 15 carrying a thumb nut 16 for clamping the'rod 65 to the lever 1|. The forward end portion of the `rod 65 is smooth and extends through the aperture 64 of the cross bar 63. The aperture 64 is of amply greater diameter than that of the portion of the rod 65 extending through such aperture. This allows for any tolerable inaccuracy of movement of the pin or rod 65. Moreover, inasmuch as the cross bar 63 is suspended from pendant links 6| and 62 any component side movement the rod or pin 65 may have will not affect the' down movement of the lens 46.,

Hence, there is no possibility of the lens carrier becoming jammed in its race.

When assembling the device the rod or pin 65 may not be centrally below the center of the lens and its carrier, but may be laterally to one side or the other. To shift the rod 65 to central position the pivot means 12 at the ends of the bow lever 1| may be moved rearwardly or forwardly depending upon in which lateral direction the rod 65 is to be shifted, and then the pivot means are tightened.

Springs 11 (see Fig. l) are connected to 'the lever 1| and to the

side walls

2 and 3 as by screws 18 or the like, to raise the lever 1| after it has been moved down and released.

To the forward'and mid portionof the. bow lever 1| is secured an angle shaped bracket having a vertical leg 19 provided with a slot 8|! through which the rod 65 extends. This leg part 19 is clamped between the mid portion of the lever 1| and the thumb nut 16. It may be vertically adjusted within the limits of the slot 80. From the lower end of the leg 19 extends rearwardly and downwardly the other leg 8| of the bracket, which leg 8| also has a slot 82 for an adjustment later described. The leg 8| sits in a saddle piece 83 (see Fig. 4) and may slide relatively thereto between' the side flanges 84',

the piece having a depending end flange 85 for abutting an end portion of a chin engaged and operated member later described.

On the bracket leg 8| is adjustably secured a chin member comprising an upwardly extending lobe 86 having an inclined face 81 which abuts the forward portion of the operators chin when the guard is in upright position as shown in Fig. 1, and a lower rearwardly extending and inclined lobe 88 normally slightly sp1-ced below the chin of -the operator, and depressible by the chin when lowered, by opening of the mouth, for that purpose.

The chin member above described is connected to the bracket leg 8| by a suitable bolt and thumb provided in the saddle piece es. The adjustment.

is made so that when thel lobe wall el contacts or abuts against the operators chin the shield wall l is in such position relative to the operators face that the lines of collimation of the operators eyes will be through the upper part of the lens it and the lens aperture as above described. In

other words, the chin part lobe @1 -8S acts las an. abutment or limit stop, when the shield is swung downwardlyirom the dotted line to the full line positions shown in Fig. 1 whereby such lobel contacts the chin.v

The space between the operators chin and the.

lobe d'8 beneath it provides for a certain amount of clearance for the normal and natural movements of the chin, as when swallowing, or chewing gum or tobacco, etc., wherein there is very little perceptible movement of the chin. Butwhen the mouth is opened further although but for a slight way the chin will then engage the lobe 88 and depress it and accordingly cause a downward swing of the lever 'll with the rod 55, and a. similar but greater downward movement of the lens d6. A given movement of the chin, by reason of the novel lever system used in this invention, will cause a greater movement of the lens according to the ratiooi leverage of the lever system..

By way of illustration, assuming that the links 6l and 62 are at one-third the distance from the iulcra 5d and 55 to the Pivot pin 50 of the levers 5S and 5l, the movement of the pin 6u and, hence, the lens d6 will be three times as great as the movement of the rod 65, and assuming that the chin acts at about the middle of the lever arm of the bow lever 'Il whereby the movement of the parts, features, or thev like, without departing l from the spirit oi the invention.

' ated lever pivotally connected to the shield and rod 65 is twice that of the operators chin, it will be apparent, then, that the movement of the lens it will be six times that of the chin, or, in other words, the operator needs only to move his chin one-sixth the. distance of movement of the -lens s6.

The opening vthus produced above the upper edge of the lens 4S will be eiected quickly and upon a small movement of the chin, and will be as wide or deep as the operator desires, depending upon the degree of chin movement he makes. Usually, it is not necessary to eiect wide openings of the lens aperture but only small openings for the purpose of affording, quickly, the particular clear and unfiltered view that might be desired between welding steps of the process of welding.

It will be noted that the width and height of the lens 66 are greater than the width and height of the

apertures

32 and 33 so that when the lens 46 is in closed position its margins overlap the frame borders of the apertures referred to and there is no leakage of light past the edge or edges of the lens 46. y

The upper bar of the lens carrier is cut away so that the line of vision can be had directly over and past the upper edge of the lens 46 when it is opened, even slightly.' That avoids confusion that would occur with an opaque bar at the upper edge of the lens 46. Also, it reduces the amount of chin movement that would be necessary to move the lens open to the extent to clear the bar at the upper edge of the lens.

While I have herein described and upon the .drawings shown an illustrative embodiment of the invention it is to be understood that the invention is not limited thereto but comprehends other constructions. details, arrangements of to the movable lens means for opening and closing the lens means; a lever arrangement in the connection from the chin operated lever andthe lens means, comprising a lens operating lever pivotally connected to the window structure and to the movable lens means, and a connecting member between said `lens operating lever and said chin operated lever for moving the lens means with a proportionately greater movement than the movement of the chin operated lever, said connecting member being adjustably fixed to said chin operated lever.

2. In a welders helmet comprising a head har ness, a shield carried by the harness and having a window 'structure witha movable lens means in the front Wall of the shield, and a chin operated lever pivotally connected to the shield and' to the movable lens means for opening and closingthe lens means; a lever arrangement in the connection from the chin. operated lever and the lens means, comprising a lens operating lever fulcrumed to said window structure and pivotally connected to the movable lens means, and a con-- necting link pivotally connected to an intermediate point of said lens operating lever and pivotally connected to said chin operated lever for moving the lens means with a proportionately greater movement than the movement of the chin operated lever.

3. In a welders helmet comprising a head harness, a. shield carried by the harness and having a. window structure with a movable lens means in the front wall of the shield, and a chin operated lever pivotally connected to the shield and to the movable lens means for opening and closing the lens means; a lever arrangement in the connection from the chin operated lever and theV lens means, comprising a leg depending from said movablelens means, a leg depending from said window structure, a lens operating lever pivotally connected to said legs, and aj connecting member between said lens operating lever and said chin operated lever for moving the lens means with a proportionately greater movement than the movement of the chin operated lever.

4. In a welders helmet comprising a head harness, a shield carried by the harness and having a. window structure with a movable lens means in the front Wall of the shield, and a chin operated lever pivotally .connectedto the shield and to the movable lens means for opening and closing the lens means; a leverarrangement inv the connection from the vchin operated 'lever and the lens means, comprising a pair of lens operating levers 'pivotally connected to said lens means at a medial point thereof and also pivotally -connected to said window structure at spaced points thereof, a. connecting member lconnected to said lens operating levers and to said chin operated 9 and to the movable lens means for opening and closing the lens means; a lever arrangement in the connection from the chin operated lever and the lens means, comprising a pair of lens operating levers pivotally connected to said lens means at a medial point thereof and also pivotally connected to said window structure at spaced points thereof, connecting links connected to said lens operating levers, a cross member pivotally connected to said connecting links and to said chin operated lever for moving the lens means with a proportionately greater movement than the movement of the chin operated lever.

6. In a welders helmet comprising a head harness, a shield carried by the harness and having a window structure with a movable lens means in the front wall of the shield, and a chin operated lever pivotally connected to the shield and to the movable lens means for opening and closing the lens means; a lever arrangement in the connection from the chin operated lever and the lens means, comprising a leg depending from said movable lens means, spaced legs depending from said window structure, a pair of lens operating levers pivotally connected to said leg depending from said movable lens means and to said spaced legs, means vfor connecting said lens operating levers to said chin operated lever forv movingthe lens means with a proportionately greater movement than the movement of the chin operated lever.

'1. I n a welders helmet comprising a head harness, a shield carried by the harness and having a window structure with a movable lens means in the front wall of the shield, and a chin operated lever pivotally connected to the shield and to the movable lens means for opening and closing the lens means; a lever arrangement in the connection from the chin operated lever and the lens means, comprising a leg depending from said movable lens means, spaced legs depending from said window structure, a pair of lens operating levers pivotally connected to said leg depending from said movable lens means and to said spaced legs, links pivotally connected to said lens operating levers, and meansl for connecting said links to said chin operated lever for moving the lens means with a proportionately greater movement than the movement of the chin operated lever.

- 8. In awelder's helmet comprising a head harness, a shieldcarried by theharness and having a window structure with a movable lens means in the front Wall ofthe shield, and a chin operated lever pivotally connected to the shield and to vthehmovable lens means for opening and closing the lens means; a lever arrangement` in the connection from the chin operatedlever and the lens-:meanacomprising a leg depending from said movable A'lens means, spaced legs depending from said'window structure, a pair of lens operating leversvpivotally connected to said leg depending from said movable lens means and to said spaced legs, links pivotally connected to said lens operating levers, a cross bar pivotally connected to said links, and said cross bar being connected to said chin operated lever for moving the lens means with a proportionately greater movement than the movement of the chin operated lever.

9. In a welders helmet comprising a head liar- ,A ness, a shield carried by the harness and having a window structure vith a movable lens means in the front wall ci the shield, and a chin operated lever pivotally connected to the shield and to the movable lens means for opening and clos- 10 ing the lens means: a lever arrangement in the connection from the chin operated level` and the lens means, comprising a lens operating lever pivotally connected to the window structure and to the movable lens means, and a connecting member between said lens operating lever and said chin operated lever for moving the lens means with a proportionately greater movement thar'ilthe movement of the chin operated lever, said chin operated lever comprising a chin piece having an upwardly extending part for contactingthe front of the operators chin and a rear-l wardly extending portion located for contact by the lower side of the operators chin, a bracket carried by the chin operated lever for supporting the chin piece, and means for adjustably connecting the chin piece to said bracket.

10. In a welders helmet comprising a head harness, a shield carried bythe harness and having a window structure with a movable lens means in the front wall of the shield, and a chin operated lever pivotally connected to the shield and to the movable lens means for opening and closing the lens means: a lever arrangement'in the connection from the chin operated lever and the lens means, said chin operated lever comprising a chin piece having an upwardly extending part for contactingthe front of the operators chin and a rearwardly extending portion located for contact by the lower side of the operators chin, a bracket carried by the chin operated lever for supporting the chin piece, and means for adjustably connecting the chin piece to said bracket, said latter means comprising a saddle piece between said chin piece and said bracket and having means for adjustably connecting the saddle piece to said bracket and having means for connecting the saddle piece to-said chin piece, said saddle piece having side flanges extending along the sides of the bracket to guide the same when adjusting the relation of the chin piece and-the bracket.

. 11. In a welders helmet comprising a head harness, a shield carried by the harness and having a window structure with a movable lens means in the front wall of the shield, anda chin operated lever pivotally connected to the shield and to themovable lens means for opening and closing the lens means; a lever arrangement in the connection from the chin operated lever and the lens means, comprising a lens operating lever pivotally connected to the window structure and to the movable lens means, and a connecting member between said lens operating lever and said chin operated lever for moving the lens means with a proportionately greater movement than the movement of the chin operated lever, said chin operated lever comprising a chin piece having an upwardly extending part for contacting the front of the operators chin and a rearwardly extending portion located for contact by the lower side of the operators chin, a bracket carried by the chin operated lever for supporting the chin piece, and means for adjustabfy connecting the chin piece to said bracket, and means for adjustably connecting the bracket to said chin operated lever.

12. In a welders helmet comprising a head harness, a shield carried by the harness and having a window structure with a movable lens means in the front wall of the shield, and a chin operated lever pivotally connected to the shield and to the movable lens means for opening and closing the lens means; a lever arrangement in the connection from the chin operated lever and 1 ii the lens means, said chin operated lever come prlsing a. chin piece having an upwardly extendlng part for contacting the front of the opere tors chin and a. rearwardly extending portion located for contact by the lower side of the op 5 erators chin, a. bracket carried by the chin op ereted lever for supporting the chin piece, and

means for adjustably connecting the chin piece- 1 connecting thefbracket to said chin ope i ver.

f ,1^ Roy e -1 Rmvennmcns om* The `following references are of record in the ille of this patent:

r s'mTEs'eA Number y vNssime te 1,854,272 Norton Ape, ie, 1932 2,339,280 'Medson Jen; 18, 19%

Number Country Date 455,647 Ge ze n Feb.. 4, 192%