US2664999A - Magazine and blade combination - Google Patents

Description

Jan. 5, 1954 Original Filed June 50,

L. H. YOUNG MAGAZINE AND BLADE COMBINATION 2 Sheets-Sheet l INVENTOR By M 7m Jan. 5, 1954 L. H. YOUNG 2,664,999

MAGAZINE AND BLADE COMBINATION Original Filed June 30, 1947 2 Sheets-Sheet 2 145611 23 A! /Z/ M INVENTOR.

Patented Jan. 5, 1954 Louis K. Ybnng-Auburndale, Mass, a ssignm-I to The Gillette" Company, a-corporation'of Dela.

were

cont nuation oi application Serial at. 753,025, Jui'ie 30,;194-7. This application July 8,1948,

Serial No} 375723 normals. (01. 2064's) This invention relates to magazines for dis-. pensing sharp-edged blades, such as; safety.- razor blades in bare, unwrapped condition. ;It has been found that the'fine cutting edge of a safety-razor blade is so delicate in its structure that it is likely to be easily damaged by any chance contactoceurringbefore actualuse of the blade. It is:- desirable, therefore, that the manufacturer, who isbest qualified to prpduce the fine cuttingedge of theblade, should also package and protect the blades as they are finished'i'n order that they may arrive unimpaired in the users hands.

one of the most satisfactory ways in which safety razor blades are packaged for distribu: tion by the manufacturer is in adispensing; mag; azine which requires the blades to'be delivered or ejected alternately from itsoppo'site ends and in which the blades arearranged-in alternately staggered relation. 'Ihe blades are thus partially separated when the magazine is loaded and this partial separationfaoilitatesejection of the blades one by one by the user inthat it per-. mits a limited preliminary: movement of the outermost blade while the blade is still under full'contr'o'l in the magazine.

'Ihe general objects of the presentinvention are to provide a' magazine and bladecombination which will insuresafetyof the blade edge in a simple and effective manner, which may be mechanically assembled and packed at low cost, which may be conveniently manipulated'by the user, and which will present: an attractive ape pea'rance; More specific features 'ofthe invention reside in a novel combination-whereby the blad'e'stackis held positively out of contact with the walls of the magazine while the uppermost blade of the stack is free for longitudinal moven'ient but only under such controlled conditions as to giveassui'ancethat its edge "or edges shall be adequately protected.- From this standpoint; an impertantreamre or the-invention consists irithe combination or downwardly-projecting lugs and an upwardly acting spring, together with a Y stack of longitudinallyslottd 'bladeshel'd by thesprin up to the level detemune'd by the lugs, and a stud rojectin with clearance through the slots of th -blades' to a; heigh't" above the 'level-ef the uppermost bladc'if the stack; I't now the cover o1 the-nia'gaz'ine is' 'provided with a window through which the user can: reach- I the uppermost" blade; that" blade may b displaced in the appropriate direction toward: an" eiiit' slot in the: endwaiiof the magazinp when: the

2, use has Pu hed the topmos .-.b .ad rad a h u h h 1. 1 .8 0 htv ma e a e n a e din nd i; the b a a'niid a t lr w of h m z n went, h i a is' a ed 9 oi: h' range of the aforementioned downwa pro? i ct n ug n i hen) e mi d q inve l a d le r i l f om. n agemen b th stud- A he am 'tim i e @Bddfih r meial of the frictional resistance provided by the easemen f a d b e thineliqwnwat projecting lugs results in an advantageous tw r b t e; s rawn-p t i -7. 5 19. ma az th, nc e ed speed n th ut e den o str a.

A fu th r s eci c fe e v r. d dq;b th i u t a e' uem d me t om is v :slow wmidly nc ned'rib; pr te d pen in immth mas: in p a ac nt n exit slqtzin. an end we l f the ma a i e w ich r b s, dapted-.1 to en age the closedleading endof; the topmost blade dur ing itsinitial movement" and to earn said end downwardly into said exit slot; Said rib is also adapted to enter the blade slotsd that ther ib may actasaguide for the trailing end of the blade during the final movement of the" blade through the exit'sldt; I V

These andother featuresoi the invention-will abes n l-aerated aria ap reciate has was ll win s ri ia h' qr a pres nts i thereof selected for purposes of" illustratid 7 shown in the aceoinpan'y'ing' drawings, in; w an;

Fig. l is a plan view'on an enlarged'scal of h fl ad z V Fig. ;2 is a corresponding view in side elevation;

FigrB isa view in longitudinal Section onthe line 3-3 of Fig. 1;

Fi Aisa t i wo -t e m a ne; I

Fig; 5 is a cross-sectional view on-the line of Fi Fig-.; 6 is an-end view; I

Fig; 7' is a view of the cover member asseen from beneath or within the magazine; and; in: dicating the position of ablade at the conclu-. sion of its preliminary ejecting movement;

Fig.- aisa view: of thecover shown-in longigtudinal'section on the'l-ine'8-,-8 of Fig; 7 but in reversed position; i

Q'is-a' viewoi the-base member asset};- fr'omabove; and again indicating the position. eta-blade asin Figw'l; v

Fig;- 10 isa view of the base member in -alde- SI elevation;

Fig. 11 is a view of the cover member in crosssection on the line l|l l of Fig. 7; and

Fig. 12 is a view in cross-section of the base member on the line l2l2 of Fig. 10.

The dispensing magazine herein shown may be constructed of any suitable sheet material, as by molding from synthetic resin, or die casting from light metal. In one Very attractive form the magazine is molded as a shell of tran parent Lucite. The magazine comprises a base member and a cover member which may be made separately and then sprung into interlocking engagement to enclose the blade stack, or they may be united by fusing or other means. The construction and design of both members is such that they have substantially uniform cross-sections of material throughout, thus facilitating molding and obviating any tendency to distort in use.

The lower or base member IU of the magazine, as best shown in Fig. 10, is rectangular in outline and fiat except that it is curved upwardly at both ends so that it terminates in flat horizontally disposed edges H and I2 which, in the completed magazine, form the lower sides of blade-exit or delivery slots. The base member ID is uniform in the cross-section of its material and its inner surface therefore extends in a smooth continuous sweep to the edges of the exit slots at its opposite ends.

The base member is also provided with a pair of narrow blade-locating studs l3 and I4 spaced apart a distance approximately two-thirds the length of the blade slot and having symmetrically tapered inner ends and rounded inner corners. These studs are aligned with each other in the major longitudinal axis of the base and are of such width as to receive the blade slot with clearance and of such height as to approach the inner face of the cover of the magazine and to accommodate a stack of about twenty blades. The parallel side edges of the base member are provided with a series of shallow rectangular recesses 15, for example three in each edge.

The base member is further provided with a transverse spring-receiving slot [6 located adjacent to one of its ends and opening in a position approximately at the level of the inner face of the base. The slot i6 is enlarged at its inner edge by a central notch l1. Directly behind the slot and in the inner face of the base is provided a transverse recess l8 providing an abrupt shoulder constituting an abutment for the spring when the latter has been once fully inserted in the magazine beneath the blade stack, as will presently be described. The notch ll extends from the inner edge of the slot I6 through the shoulder of the recess 18.

The cover or upper member 20 of the magazine, as best shown in Figs. 7 and 8, is also rectangular in outline and has side walls 2| and 22 spaced so as to receive between them the base member In and shouldered in their lower edges so as to provide a series of shallow rectangular lugs 23, three on each edge, designed to lit with clearance and interlock with the recesses l of the base member. There is sufficient resiliency in the material of the cover member to permit it to be sprung into interlocking engagement with the base member, and when so interlocked the lugs 23 positively determine the longitudinal relation of the two parts which are thus assembled and together provide a shell enclosure for the blade stack. A clearance of about .007 inch is provided between the lugs 23 and the recesses l5 for manufacturing purposes and to relieve strain in the finished magazine.

The cover member is provided with a series of downwardly projecting means, such as projections or lugs 26, for example four in number, and these lugs in the illustrated magazine are ar ranged about the periphery of an oval window 27 which is formed symmetrically and centrally in the cover member and which is of sufficient area to admit the thumb of the user. The lugs of each lateral pair may be arranged if desired so that their respective horizontal, axes are angularly related as illustrated, and all lugs terminate at their lower ends in a common plane, thereby to afford an effective bearing for determining the position of the uppermost blade of the stack in the magazine, as will presently appear. The pair of lugs at each end of the window are thus transversely spaced apart. The cover member is also provided centrally with longitudinal guide ribs 24 and 25 which in the assembled magazine extend downwardly into the respective exit slots at opposite ends of the magazine.

When the two parts of the magazine are assembled, the studs I3 and M lie in the magazine outside the outline of the pattern of the downwardly extending lugs 26, and the upper edges of the studs l3 and M are located substantially in the plane determined by the lower faces of the lugs 26 or slightly above such plane. Thus the studs and lugs pass each other in a vertical direction at their ends.

The magazine includes a forked leaf spring 28 which is slightly narrower than the width of the spring slot I6 and is forked so that when introduced through the said slot its advancing end and sides will pass freely past the studs 14 and I3. The insertion of the spring is facilitated by the notch 11, which permits the rear edge of the spring to be advanced and followed by a blade or other pointed instrument until its trailing end is fully settled in the recess I 8 and positively prevented from being thereafter displaced toward the slot I6. The spring is upwardly bowed and serves to press the blade stack yieldingly upwardly to a position determined by engagement of the uppermost blade in the stack with the inner faces of the lugs 26. The spring 29 may be inserted as the last step of the packaging operation, after the blade stack has been assembled and the magazine closed. While its rear end is anchored against the shoulder of the recess "3, its forward end is unconfined and is free to shift on the surface of the base member H) as the effective thickness of the blade stack is progressively reduced in use.

The magazine is herein shown as loaded with a stack of about twenty blades of a well-known commercial type, that is to say, double-edged blades 30 each provided with a longitudinal median slot 3| and each carrying direction indicia in the shape of arrows 32 which inform the user which way the uppermost blade must be moved to eject it properly. The indicia feature, in combination with a dispensing magazine of this general type, is the subject matter of copending application Serial No. 752,908, filed June 5, 1947, in the name of Louis H. Young, now Letters Patent No. 2,544,410, dated March 6, 1951. Each blade is notched at its corners and those notches define elongated unsharpened end portions, cen-- trally and symmetrically located in the blade and of such width as to be received with clearance between either pair of logs 26st the endsoi window 2'1.v

In preparing the dispensing. magazine above be movedin being ejected. The-spring 29 isthen' inserted through the slot l6 in. the manner already explained andthe blade staclrpressed upwardly by the spring to a level determinedby the inner faces of. thelugs- 26. At the same time the studs l3 and I l project with clearance: through the blade slots to a height slightly above the level ofv the uppermost blade as determined by its engagement with the lugs 26, thatis,-the inner ends of thestuds I3 and Hkon the one hand, and. the lugs 26', on the other hand, overlap vertically by a slight amount.

It will be seen therefore that the concealed outer end of the uppermost blade is held in positive engagement with the outer edge of the-righthand stud I3 and that the said blade can be moved only outwardly toward the right, in the direction indicated by the arrows 32 thereon. When the user Wishes to ejectthis-blade, he may insert his thumb through the Window 21 anddisplace the blade toward the right. Atthe outset of this'movement of. said blade, its closed lead.- ing end is cammed downwardly by the inclined lower surface of the rib 24; so that saidleading edge enters the exit slot ll. When the aforementioned topmost blade hasbeen pushed to the" right by the user sufilciently for its leading end to project a slight distance beyond said exit slot H, the user may grasp or engage said leading end of the blade and pull it quickly out of the magazine.

At the: start of its movement toward the right hand exit slot H, the topmost blade remains firmly pressed, by the spring 29, against the pair of depending lugs 26 at the right of the fingeropening until the trailing. end of the bladeslotcomes adjacent the upstandinglu'g. 13. Thomas said blade moves furtherto theright, its trailing.

end moves out from under the'last mentioned; pair of depending lugs,and is immediately kickect upwardly by the spring 29 so that saidxtrailing" end rises above the adjacent upstanding guide lug l3, and the blade is freed from that lug. This" position of the blade is shown in Figs. 7' and 9. From Fig. 7 it will be noted that the pair of de pending lugs 26 at the right of the openingi'l mains engaged with said slot when the blade reaches the posiiton shown in Fig. '7'. Thus said rib 24 is available to guide thebladeathrough its engagement in the blade slot, during they re:- mainder of the withdrawal of the blade.

As above noted, when the user grasps or emcases tbeiorward 6nd0the -b1a eefter it has been pushed partially through the exit slot, he may readily andquicklywithdraw the-blade completely fromthemagazineby simply pulling outwardly thereon. When the user pulls on the leadingend of. the blade before the-trailing end of the blade has cleared the pair of depending lugs: 26-nearest the exit slot, the. sudden release of spring pressure on the blade as its trailing end is-kicked upwardly past-said depending lugs, prodimes a snapeffect whereby the: blade is drawn out of the. magazine. with increased speed and without tendency: to twist, thus additionally insuring that its cutting edges are safeguarded during. the final emergingstage. In other words, as long as the spring presses the topmost blade against the depending lugs referred to, the user must exert sufficient pulling force to draw the blade outwardly against. the frictional I resistance provided by the pressure of the blade against.-

those lugs. However, as the user continues todraw the-blade outwardlyits trailing end passes beyond. the depending lugs and is kicked upwardly by the spring to clear the adjacent upstanding lug sothat the above mentioned resistance to its outward movement is: instantly dispelled, and under the withdrawal force exerted. by the user the blade is snapped outwardly with increased velocity. This snap effect. is advantageous in propelling the blade. rapidly outwardly in a straight line duringits final emergence from the magazine. slot... If the: downward pressure exerted-.-'by the user in ejecting a. blade is sufficient to depress the whole stack against the action of the spring 29, the uppermost-blade may be advanced at a level slightly below the edges H or 12 of the exit slot, and in this case the smooth inner curved surface of the base will tend to dimet or elevate.- the' advancing end of the blade into theexit slot.- Onthe other hand, if there has been removedthrough the exit slot I I, the

next. blade of the stack becomes the topmost blade. Itsarrows indicate to the user that it Should/be ejeotedthrough the exit slot l2 in the left-handend of the magazine. In its movement towards and throughsaid slot-the same sequence 01"; operations is involved as above described with respect tovthe precedingblade.

This applicationisacontinuation of my co pending-application, Serial-No. 758,025, filed June 30,1947;

Having thusdisc'losed my invention and describedin detail an illustrative embodiment thereof, I claimas new and desire to secure by Letters-Patent:

1; 1tblade-dispensing magazine comprising base: and cover." members coextensive in outline and togetherforming a' blade enclosure, said members converging and being separated at both ends by narrow-exit slots, thebase member having spaced-upstanding studs in its longitudi- Hal axis and the cover member having spaced downwardlymrojecting lugs offset both transversely'and' longitudinally with respect to said studs and" located further from the blade exit slots" than said studs and terminating approximately inia common plane below the upper ends of'saidstuds, .a leaf spring resting. on the base, and a longitudinal guide rib leadingto each exit slot, and the cover being provided withv a window of finger width which opens into the en closure between the said studs.

2. A blade-dispensing magazine comprising a substantially rectangular shell with exit slots at both ends and a window of finger width in the top face, lugs disposed internally about the periphery of said window, and fiat-sided studs projecting upwardly from the bottom of the shell being disposed in its longitudinal axis and located between said lugs and said exit slots, in. combination with a stack of slotted blades threaded in alternately staggered relation on said studs, and a spring holding the stack pressed against said lugs and substantially in alignment with the exit slots of the magazine while threaded on said studs.

3. A blade-dispensing magazine comprising an elongated shell-like enclosure having spaced fiat-sided studs projecting upwardly in longitudinal alignment with each other from its bottom and into proximity to its top, a stack of slotted blades threaded alternately upon the respective studs, a plurality of longitudinally spaced blade-engaging lugs projecting downwardly from the top of the enclosure to points below the top of said studs, the top having an opening through which the blades may be engaged, and a spring below the stack holding the uppermost blade of the stack yieldingly against said lugs, the lugs being ofiset transversely and also longitudinally inwardly with respec to the studs thus permitting said uppermost blade to be lifted and to pass over a stud when the blade is moved lengthwise to the end of its slot, the enclosure having blade exit slots at its ends and said lugs being located further from said slots than the studs.

4. A blade-dispensing magazine comprising a substantially rectangular shell having blade-exit slots at its opposite ends and an intermediate window in its upper face, internal projections spaced about the window, longitudinally aligned studs rising from the bottom of the magazine in locations between said projections and the respective ends of the magazine and to a level above the blade-engaging ends of the spaced projections, and a stack of slotted blades spring pressed against said projections and threaded alternately upon said studs, the uppermost blade being movable on one of the studs to a position in which its trailing end passes beyond the said internal projections so that the blade is thus free to rise above the said stud.

5. A razor blade package comprising, in combination, a plurality of stacked double-edged blades each having a longitudinal slot which terminates short of the extreme ends of the blade, a case containing said stack and having an exit opening in an end thereof, means projecting upwardly from the bottom of said case through the slots in said blades for maintaining said blades in substantial alignment in said case, the top of said case having a finger opening through which the topmost blade may be engaged frictionally to urge it longitudinally toward said exit opening, means projecting downwardly from the top of said case and offset transversely and also longitudinally inwardly with respect to the upwardly projecting means, for engagement by said topmost blade to maintain the latter below the top of said upwardlyprojecting means and so located as to be disengaged from said blade when the latter is moved a sufiicient distance longitudinally, and spring means for freeing the topmost blade for movement past said upwardly-projecting means when said blade is moved out of engagement with said downwardly-projecting means, the upwardly projecting means being spaced beyond the contour of said finger opening and located between said finger and exit openings.

6. A razor blade package comprising in combination a plurality of stacked double-edged blades each having a longitudinal slot which terminates short of the extreme ends of the blade, and each having an end of reduced width projecting beyond corner notches in the blade, a case containing said blades and having an exit opening in an end thereof, means projecting upwardly from the bottom of said case through the slots in said blades for maintaining said blades in substantial alignment in said case, the top of said case having a finger opening through which the topmost blade may be engaged frictionally to urge it longitudinally toward said exit opening, a pair of projections extending downwardly from the top or" said case adjacent the forward end of said finger opening and offset longitudinally with respect to the up-wardly-projecting means, said pair of projections being engaged by topmost blade when the latter is in normal position and being disengaged therefrom when said blade is moved a sufficient distance longitudinally, said projections being spaced apart a distance less than the total width of the blade but not less than the width of said blade end portion projecting beyond said corner notches, and a spring for applying pressure to the topmost blade to maintain the latter pressed against said pair of downwardly extending projections until said blade is moved longitudinally out of engagement therewith and for then freeing said blade from said upwardly-projecting m ans, the latter means being spaced beyond the contour of said finger opening and located between said downwardly extending projections and said exit opening.

7. A razor blade package comprising in combination a plurality of stacked double-edged blades each having a longitudinal slot which terminates short of the extreme ends of the blade, a case containing said stack and having an exit opening in an end thereof, means projecting upwardly from the bottom of said case through the slots in said blades for maintaining said blades in. substantial aligment in said case, the top of said case having a finger opening through which the topmost blade may be engaged frictionally to urge it longitudinally toward said exit opening, separate elements projecting downwardly from the top of said case forwardly of the finger opening and engaging the said topmost blade when the latter is in normal position to maintain said blade below the top of said upwardly-projecting means, said downwardly-projectin elements being so positioned in longitudinally oiifset relation to said upwardly-projecting means as to be disengaged from said topmost blade when the latter is moved longitudinally a sufiicient distance to br ng the trailing end of its slot adjacent said upwardly projecting means, and spring means acting upwardly against the stacked blades for maintaining the top most blade in engagement with said downwardly-projecting elements until said blade is moved longitudinally out of engagement therewith and for then tilting said blade to free it from said upwardly projecting means, the latter means being spaced beyond the contour of said finger opening and located between said downwardly projecting elements and said exit opening. 1 v

8. A casing for razor blades l iaving fblade exit openings in opposite ends, studs extending upwardly from the bottom of saig casing for project-ing through slots is "saidblades, the top of said casing being generally coextensive with the bottom and having a sheer openingthrough which the topmost blade may be enigag rictionally to move it longitudinally toward one or the other of said openings, lugs projecting downwardly from the top of said casing and ofiset transversely and also longitudinally inwardly with respect to the studs and engageable with said topmost blade when the latter is in its normal position and adapted to be disengaged from said topmost blade when the latter is moved a suflicient distance longitudinally, the lugs being spaced beyond the contour of thefinger opening, and projections extending downwardly from said casing top at opposite end portions of said casing for insuring the guiding of the blades "saunas-n1 slotted blades,- the admiratio -01 a during the latter portions of their travel through the respective exit openings subsequent to the freeing of said blades from the studs,

9. A razor blade package comprising in combination a stack of longitudinally slotted blades, a case containing said stack and having an exit opening in an end thereof, the top of said case having a finger opening through which the topmost blade may be engaged frictionally to push the blade through said exit opening sufliciently for the operator to engage the leading end of the blade and pull the latter completely out of said exit opening, means comprising lugs projecting downwardly from the top of said case for engagement by said topmost blade, spring means acting through said stack and urging said topmost blade against said lugs to provide therewith a frictional resistance to movement of said blade as the latter is drawn outwardly by the operator and to provide a snap action upon disengagement of said blade from said lugs under the outward force applied to said blade, and a stud between said exit opening and the first mentioned lugs for cooperating with the slot in said topmost blade to guide the latter during its outward movement to the exit opening said stud extending above the lower level of said lugs.

10. A razor blade package comprising in combination a magazine having exit openings at its opposite ends, a pair of studs projecting upwardly from the bottom of said magazine, a stack of slotted blades impaled alternately upon said studs and having end portions of reduced width, the top of said magazine having a finger opening through which successive topmost blades may be engaged frlctionally to push said blades alternately through said exit openings sulficient- 1y for the operator to engage the leading ends of the blades and pull the latter completely out of said exit openings, transversely spaced lugs projecting downwardly from the top of said magazine between the ends of said finger opening and the respective studs, and spring means cooperating with said blades and lugs to provide frictional resistance between each topmost blade and an associated lug during part of the movement of said blade under the pull of the operator with subsequent snap action and increased rapidity of withdrawal upon disengagement of said blade at its trailing reduced end portion from said lug under said pull.

11. In a blade-dispensing magazine for 1onshell having a top openin through which the blades may be engagd, and a blade exitgslot at magoyvn gmn projecting internal lugs and an upwardly acting spring, a stack of longitudin lly, s otte blades hel .by the sp in at alev determined by said lugs and a stud having a portion projecting. upwardly in the magazine with clearance through the slots of the blades to a e ht er th level of up e m .e eqf t i f v eee d s ud bei ofiset lo imamany with respect to the lugs and located nearer the exit slot than the lugs.

'12. A blade-dispensing magazine in combination with a stack of longitudinally slotted sharp edged blades, the magazine comprising a shell with blade exit openings at its opposite ends and an intermediate window of finger width, a pair of upstanding studs within the magazine on which the blades are alternately impaled in staggered relation, and downwardly extending lugs spaced about the periphery of the window with their lower ends in a common plane below the tops of said studs and being spaced both transversely with respect to the studs and located longitudinally closer together than the studs.

'13. A blade dispensing magazine comprising an external shell having opposed walls, and exit openings at its opposite ends, a set of internal projections comprising a pair of longitudinallyspaced studs extending from one of said walls in one direction into said shell, a second set of internal projections extending from the other of said walls in the opposite direction into said shell, and oli'set longitudinally inwardly of said studs, the shell having an opening in the other of said walls and located between said second set of internal projections, a spring in said shell, a stack of slotted blades empaled alternately on said studs in longitudinally staggered relation and pressed by said spring against the ends of the other set of projections, each blade being movable by reason of its slot in the direction of the exit opening nearest to it to clear the firstmentioned set of projections while still empaled on its respective stud.

14. A blade-dispensing magazine molded of thermoplastic material and comprising a base member, a cover member generally coextensive with and secured to said base member and jointly forming therewith a generally rectangular walled enclosure adapted to house a stack of centrally-slotted double-edged razor blades, said base and cover members having juxtaposed end portions spaced from each other to provide a blade exit opening through which a blade may move during ejection from said magazine, the end portion of said base member having a smooth sloping inner surface leading upwardly to said blade exit opening adapted to guide the forward end of the exiting blade into said opening, the cover member having a thumb-receiving opening and two pairs of integral downwardly-extending blade-restraining projections located around the periphery of said opening and spaced longitudinally from each other, and the base member having a pair of integral upstanding longitudinally aligned flat-sided spaced studs adapted to extend with clearance through the central slots of the housed blades, the thumb-receiving opening overlying the space between said studs and each stud extending upwardly to a level well above the lowermost tips of the nearest pair of downwardly-extending LOUIS H. YOUNG. 5

References Cited in the file of this patent Number UNITED STATES PATENTS Name Date Ostrander June 17, 1930 10 Kylberg Dec. 1, 1931 Number Name Date Testi May 16, Lashar May 30, Roberts June 23, Testi Sept. 28, Benjamin Mar. 28, Roberts Nov. 26, Dalkowitz Apr. 6, Auerbach Apr. 26, Testi Jan. 1,

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