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Sept. 3, 1946. H. A. LOCKWOOD_ ANTICORROSIION PLUG 2,407,023 Fiied June 25, 1942 lNVEN-TOR Patented Sept. 3, 1946 2,407,023 UNITED STATES PATENT OFFICE 2,407,023 " ANTICORROSION PLUG Harry A. Lockwood, Meriden, Conn., assignor to Chandler-Evans Corporation, a corporation of Delaware Application June 25, 1942, Serial‘ No. 448,443 4 Claims. 1 (Cl. 215-37) 2 ,My invention relates to anti-corrosion plugs. at the usual, but not necessarily slightly rounded It has among its objects to provide an improved edge I I of the end wall thereof at that extremity anti-corrosion plug. A further object of my in of the plug I. Here it will also be noted that the vention is to provide improved closure means for closure 8 extends peripherally beyond the annu such a plug which are of improved construction 5 lar contact thus provided between its concave and cooperate in an improved manner therewith portion I0 and the annular portion I I on the plug in effectively sealing the dehydrating material in the plug. Another object is the provision of such an improved plug having a closure of such im proved construction as to make it possible to ap ply the closure readily and quickly while obtain I in such manner as thereby to provide an over hanging peripheral ?ange ‘portion I2. It will also be observed that the concave portion II! is herein 10 extended out to the extremity of this portion I2 in such manner as to provide an inwardly tan ing an effective seal, while also readily and quick ly removing the closure whenever desired. A still further object of my invention is to pro vide improved concave closure means of a con pered space I3 between the ?ange portion I2 and ' the body of the plug I. In Order to seal the closure 8 to the plug I, a 15 struction adapted to be readily and inexpensively manufactured and readily and quickly attached small quantity of a suitable solvent for the plastic material of plug I and closure 8 is applied to the surfaces of the concave portion IQ of the closure 8 and the annular portion I I of the plug‘ I. A quick-drying solvent is preferred. For ex ample, ‘if the plastic is “Tem'te” (cellulose ace tate butyrate), then the solvent used may be over the perforated inlet of such a plug in such manner as to cooperate therewith and with a suitable sealing medium in an improved manner to provide an improved very e?ective, yet readily applied and separable, frangible sealing connec» acetone. A small amount of the plastic material is dissolved, and when the solvent dries, the tion between said closure means and the plug. These and other objects and advantages of my plug and closure are sealed to each other by an improvements will hereinafter more fully appear. 25 integral annular connection of the same material In the accompanying drawing, I have shown as the plug and‘closure. for purposes of illustration one embodiment Obviously, the exterior of the closure 8 may as which my invention may assume in practice. sume different forms, but the same is preferably In this drawing: provided with a convex outer surface I5 diverg Figure 1 is a side elevation of this form of my 30 ing slightly toward its periphery from the con improved plug; cave surface Ii! in such manner as to provide Fig. 2 is a central longitudinal sectional view such additional material in the flange portion I2 of the same; as to provide a ?ange portion of substantial Fig. 3 is an end view showing the closure car strength. rying end of the plug, a portion of the closure be ing broken away to facilitate illustration, and 35 . As a result of my improved construction, it will be apparent that the perforated air inlet 1 is effectively sealed by the engagement of the con cave portion III on the closure 8 with the portion II surrounding the air inlet; the acetone acting, in effect, to integrally unite the parts and thus form a narrow and frangible sealing ring, readily breakable by prying or knocking off the closure 8. Moreover, the portion II will thus be effectively sealed by the concave portion I0, regardless of 45 exact centering of the plug and closure, thus Fig. 4 is an enlarged detail view of the inlet end of the plug with my improved closure shown in section to facilitate illustration. In this illustrative construction, I have shown 40 an anti-corrosion plug, generally indicated at I, and, as usual, preferably formed of a suitable transparent plastic, as for example “Tenite” (cel lulose acetate butyrate), and provided with a lon gitudinally extending chamber 2 containing suit able dehydrating or desiccating material such, for example, as silica gel; the plug I herein being provided at one end with a usual end member 4, markedly facilitating and expediting sealing. Within certain limits the closure or cap can have its axis at an angle to that of the container body and having a wrench receiving portion 5 inter without interfering with the making of an effec mediate its ends, an adjacent thread 6 adapted to 50 tive seal. The ?ange portion I2 also extends be threaded in a spark plug aperture of an inter beyond the periphery of the adjacent portion of nal combustion engine, and at its opposite end the plug I beyond the threaded portion 6 on the being provided with an air inlet portion 1, here~ latter in such manner as not only to protect in having a perforated portion ‘Ia preferably, but the frangible seal I4, but also quite obviously to not necessarily, slightly countersunk in that end 55 make it impossible for the plug with the closure of the plug and sealed by my improved closure 8 8 thereon to be inserted in an engine spark plug which is hereinafter more fully described. aperture adapted to receive the threaded portion This closure 8 preferably is formed of the same 6. Only after the cap has been removed can the material as the plug I. As shown, it is provided plug be placed in the spark plug hole of the with an inner cupped face 9 having a peripheral 60 engine for desiccating the engine cylinder. The concave portion I 0 engaging the inlet portion 1 provision of a separate closure of plastic also 2,407,023 3 4 therein and a sharp-edged peripheral surface surrounding said aperture, and a closure member of said material having a greater diameter than makes it possible to provide such a closure of different color from the plug in such manner as thereby also to make even more obvious that this closure should be removed. Due to the overhang said peripheral surface and a concave surface disposed toward said aperture, said surfaces per ing flange l2 and the tapered space provided be mitting a limited angularity of the axes of said members while a continuous, substantially circu lar line contact is maintained therebetween, said tween the same and the body of the plug, it will also be evident that for removing the closure 8, either a suitable tool may be inserted under this ?ange with a slight prying action, or, if desired, members being adapted when placed in contact a blow may be struck on the under side of the 10 and upon the application of a solvent for said material to the contacting surfaces thereof to ?ange, in such manner as thereby readily to sever dissolve slightly in said solvent so that upon the slender annular fragible seal I4. Moreover, evaporation of said solvent, a narrow, easily it will be noted that the construction is such that frangible annular sealing connection is formed the closure 8 is removable as a unit and with between said casing and closure members. out breakage while the frangible connection 2. A sealable container comprising a casing breaks with a clean break in such manner as to eliminate loose material which otherwise might enter the cylinder. Also, due to the shape of the cupped face 9 of the closure 8 and its spacing from the perforated portion 1a of the air inlet, as well as to the slight countersinking of the portion ‘la, the perforations therein are also kept clear of obstructing material. Space is conserved and the removal of the cap facilitated by having the peripheral part of the crowned cap extend across the side wall of the body at an inclination or angle to the body axis substantially .in the manner shown. These and other advantages of my improvements will, however, be apparent to those skilled in the art. The member 4 previously referred to is a closure for that end of the plug which is outermost when the plug is installed on the engine cylinder. ‘It will be appreciated that as it appears on the market the improved article is a completely closed member of plastic material having an aperture therein and a sharp-edged peripheral surface :; surrounding said aperture, and‘a closure mem 20 ber of said material having a greater diameter than said apertureand a concave surface dis posed toward said aperture, said surfaces per mitting a limited angularity of the axes of said members while a continuous, substantially circu 25 lar contact is maintained therebetween, said members being adapted when placed in contact and upon the application of a solvent for said material to the contacting surfaces thereof to dissolve slightly in said solvent so that upon 30 evaporation of said solvent, an integral annular sealing connection is formed between said mem bers, said closure member having a thickened rim section providing, by virtue of its greater 35 and sealed capsule preferably of transparent plastic containing a charge of desiccating mate rial which is visible by virtue of the transparency of the capsule, the latter including as a part diameter, a prying edge which may be used to break said connection and remove said closure. 3. A sealable container comprising a casing member of plastic material having an aperture therein and a sharp-edged peripheral surface surrounding said aperture, and a circular closure thereof a cap member preferably of the same 40 member of said material having a greater diam plastic material as the body, preferably united in one piece with the body as by the use of acetone or other solvent in the manner previously de scribed. In any event there is a relatively easily ' frangible seal between the cap and the body which, however, is readily maintained while the article is stored or not required for use. When the article is required for use it cannot be ap plied to the engine cylinder without breakage of the seal because the external diameter of the cap is greater than the minimum internal diameter of the threaded (spark plug) socket receiving the desiccating plug. From this it will be apparent that the external diameter of the cap should be in excess of the minimum diameter of the screw eter than said aperture and a surface of arcuate cross-section, said surfaces permitting a limited angularity of the axes of said members while a continuous, substantially circular contact is maintained therebetween, said members being adapted when placed in contact and upon the application of a solvent for said material to the contacting surfaces thereof to dissolve slightly in said solvent so that upon evaporation of said solvent, an integral annular sealing connection is formed between said members, said closure member having a'thickened rim section provid ing, by virtue of its greater diameter, a prying edge which may be used to break said connection and remove said closure. 4. A sealable container comprising a casing threads 6 formed upon the plug rearwardly of the member of plastic material having an aperture cap carried by the forward extremity of the plug. therein and a sharp-edged peripheral surface Upon removing the cap in the manner previously surrounding said aperture, and a closure mem described, the desiccating material is placed in communication with the atmosphere through the 60 ber of said material having a greater diameter than said aperture and a surface of arcuate forward end of the capsule body containing the cross-section, said surfaces permitting a limited screen-like member ‘Ia. This screen-like mem angularity ‘of the axes of said members while a ber is, as a result of the removal of the cap, fully continuous, substantially circular contact is uncovered. While I have herein speci?cally described one 65 maintained th'erebetween, said members being adapted when placed in contact and upon the ap embodiment which my invention may assume in plication of a solvent for said material to the practice, it will be understood that this form has contacting surfaces thereof to dissolve slightly in been chosen for purposes of illustration, and that said solvent so that upon evaporation of said the invention may be modi?ed and embodied in solvent, an integral annular sealing connection other forms without departing from its spirit or 70 is formed between said members, said closure the scope of the appended claims. What I claim as new and desire to secure by Letters Patent is: 1. A sealable container comprising a casing " member of plastic material having an aperture 75 member providing, by virtue of its greater diam eter, a prying rim which may be used to break said connection and remove said closure. ‘ ‘HARRY A. LOCKWOOD.