Патент USA US2405927код для вставки
Àug» i3» 3945. _ N. A. TORNBLOM DRAIN FITTING Filed Oct. l1, 1944 2940592? Patented Àug. 13, 1946 2,405,927 UNITED STATES PATENT QFFICE 27,405,927 DRAIN FITTING Nils A, Tambien?, Ghîeago, 1,11-, assigner te Apple= ton` Electric Company! a corporation of Illi reis Application Qctoher 11, 1944., Serial N0. 553,213 i 5 claims. (o1. 13a-fig), 2 Water often collects in boxes of various kinds and conduits for wires _in distributing systems for _electricity and dees harm if it is not removed» providing valleys about one thirty-second oi _an inch having been found satisfactory, The ele ment 6 is preferably lightly clamped between the A simple little hole at a low point in a box Ato be drained will serve to permit water to escape but, in many Situations. this expedient cannet be adopted because of lire hazard-,Álamo as well as Water beine able te pees through .Suchî a hele Thís .has led te the Creation ef ñttîngs which Will permit the escape ef water and yet be “11eme tight.” The mest eemmen. type of Such a .ñtting is based. en the .idea- ei a screw extending up through a Wall at the bettem 0f a space te be drained and being such a leese fit that Water een 110W Out elena the threads ¿In order ier such a device to be- “llame tight” the escape passage must extend along many turns of the screw threadz the downward slope being so gradual that two members of the plug, the parts being so ar ranged, however, that water flowing down through the upper member of the plug can readily enter the upper ends of the valleys between the lands of the screw threads 'I and thereafter ivlow lO freely out o_f the lower ends o_f these valleys and drain out of the cup through the holes 5. In the arrangement shown, the cylindrical element rests on a central boss 8 on the bottom wall of the cup, thus providing annular chamber or free space in the bottom ef the eue above the heles 5 and below the-lower ends eff the valleys spiral ling around the cylindrical element. A_lso, the upper member ver the nlug has at the betteln a teatral bess 9», eeetaeties the tee ef the element water does not flow freely and dirt entering the passage stays there instead of being washed away. 20 6 and provided in its under face with a wide, deep groove I0 extending diametrically across the The object of the present invention is to pro same so as to be in communication with the lower duce a simple and novel “flame tight” drain f1t end of the h'ole 4 in the upper member of the plug. ting in which the principle of a helical outlet pas By using a triple thread, there is obtained the sage is utilized, but in such a, manner that the eñect of a valley or passage having three times escape path is relatively short and steep and per the cross sectional area afforded by the valley of mits a flow of water in relatively large volume. a single thread and, furthermore, the pitch of For a full understanding of th'e present inven the valleys is much steeper. This last charac tion and of its objects and advantages, reference teristic is important because, in order to be ex may be had to the following detailed description plosion proof or “flame tight,” must be of small taken in connection with the accompanying area in cross section and, if the slope or pitch be drawing, wherein: too gradual, the water will bind in the valleys and Figure 1 is an axial section through a ñtting will not drain away properly. Should foreign embodying my invention, along with a fragment matter get into the valleys and clog the same, the of a box to which the fitting is applied; Fig. 2 cup need only be unscrewed to permit the element is a section on line 2_2 of Fig. 1; Fig. 3 is a top 6 to be removed and cleaned. view of the ñtting; Fig. 4 is a bottom view of the In Figs. 5-7 I have shown a smaller ñ‘tting in upper member of the two part plug; Fig. 5 is a which there is a simple plug I I adapted to be section, similar to Fig. 1, showing a modification; screwed into the bottom of a box B or the like Fig. 6 is a section on line 6-6 of Fig. 5; and Fig. and having an axial, smooth bore I2 larger in 7 is a section on line l-‘I of Fig. 5. diameter than the hole II in the upper member I Referring to Figs. 1-4 of the drawing, I and 2 0f the plug in the other form. The cylindrical are the upper and lower members of a two part element I3 is a sliding ñt in and extends through plug. The member l is a solid body having an this bore from top to bottom, and is provided upper part adapted to be screwed into a hub or with an external triple screw thread I4 in which downward projection on a box A; while the lower the valleys are of the same width and depth as portion is in the form of an enlargement having are those on element 6. The part I3 is held an internally screwthreaded flange 3 on the under against dropping out by a head on its upper end. side. The member 2 is a cylindrical cup the open This head may conveniently be a thick disk I5, end of which is screwed into the lower end of larger in diameter than the bore I2, held in member I. The member I has a central hole d place by a screw I6, passing through the same drilled through the same from top -to bottom, and and into the upper end of the cylindrical element the member 2 has holes 5 in the bottom wall for I3. In the under face of the disk are deep, wide the escape o1’ water. A solid cylindrical part 6 grooves I'I, that permit water in the box to flow lits slidably in the cup and is provided with ex ternal, multiple screw threads "I, a triple thread through the same, when the marginal portion of the disk rests on the bottom of the box; the 2,405,927 3 cylindrical element are spaced farther apart than the length of said bore, whereby said element is water thus ñnding its way into lthe upper ends of the Valleys between the lands of screw threads I4. The part I3 is preferably a little longer than the plug so as to project somewhat below the lower end of the latter. left free to be moved up and down through a limited distance. 3. A drain ñtting consisting of a plug having a smooth central bore, a cylindrical element i'lt On the lower end of the ele ment I3 is a head I8, preferably integral there with, that makes it impossible fork they element to be pushed out through the -top of the plug. l ting slidably in said bore and having multiple external screw threads, a. disk larger in diameter than said bore overlying and detachably con This device operates in the same manner as 10 nected to the upper end of said element, and there that previously described, to drain Water from being channels in the under side of said disk to the box. Because the element I3 is longer than ' the plug it may be jiggled up and down from time to time, without opening the box, to clear the valleys, if the flow of water therethrough be permit water to enter the upper ends of the valleys between the screw threads when the disk lies on the upper face of the plug. 4. A device as set forth in claim 3, wherein 15 . the cylindrical element is longer than the plug While I have illustrated and 'described with and has on its lower end an enlargement to pre particularity only two specific forms of my inven vent-it from being lifted up through the plug, tion, I do not desire to be limited to the exact 5. Means for draining a chamber in a member, structural details so illustrated and described; which comprises a body having a long, smooth but intend to cover all forms and arrangements 20 bore, a long, cylindrical member ñtting slidably which come within the deñnitions of my inven in said bore and projecting down below the lower tion constituting the appended claims. end of the latter, and parts on the ends of said I claim: \ cylindrical member to hold it against withdrawal 1. Means for draining a chamber. in a mem from the said bore, while permitting it to be lifted 25 ber, which comprises a body having a long smooth through a limited distance by upward pressure in bore, a long cylindrical element ñtting said bore the upward direction against its lower end, and and having multiple screw threads on the same, there being multiple external screw threads on parts on the ends of said element to hold it said cylindrical member; the part at the upper against removal from said bore; said parts each end of said cylindrical member normally resting having a transverse dimension greater than the 30 on the bottom of the chamber and being shaped diameter of said bore, the upper part being shaped to leave the upper ends of the valleys in the screw to leave the upper ends of the valleys in the threads open at all times, and the part on the screw threads open, and there being normally an lower end of the cylindrical member being nor outlet from the lower ends of said valleys between mally spaced apart from the bottom of the mem 35 the lower of said parts and the bottom of said ber containing the bore. member. ` 2. A means as set forth in claim 1, wherein the NILS A. TORNBLOM. distance between the parts on the ends of the sluggish.