Патент USA US2256902код для вставки
Sept. 23, 1941. 2,256,902 c. K. HUTHSING FIRE EXTINGUISHER CONSTRUCTION Filed Nov. l'7,~ 1958 2 Sheets-Sheet l ‘ l I/ NTO/e Marías /gf w25/¿Sigg yßme. TTORNEYS. Sept. 23, 1941. c, K. HUTHSING 2,256,902 FIRE EXTINGUISHER CONSTRUCTION Filed NOV. 17, 1938 2 Sheets-Sheet 2 Z0 ~ 2,256,902 , remise ’sepa _23,’1941` » UNITED STATES 'PATENTy ’ QFFICE 2.25am , rma moments ooNsï'mUorroN ‘essere x. antenne', crime reime, men. ' [email protected] November 1'1, 193s, Senn No. 240,892 l ' z calma. ' (ci. rea-15s) 'îhis invention relatesto a ilne vextinguisher be either a total absence or a minimum of slip oithehandtypepage of ñuid past the piston when reclprocated The main objects of this invention are to pro in its cylinder. It is also well mown that dueto vide a nre extinguisher which is assured of being the inherent character of iire extinguishing iiuids in operable condition regardless of the length there is a great tendency for corrosion to take of time of non-use and which therefore can be depended upon at all times in theevent of emer place within the ñre extinguisher on those parts . which are contacted by the ñre extinguishing -gency; to provide a construction in which the pis iìuid. This corrosion will oftentimes freeze the ton packing will have a close working ñt so as to piston to the cylinder wall when the nre extin , prevent slippage of iiuid met the piston and’stili 10 guisher has not been in use for a long period oi not be frozen in position by corrosion regardless time with the result .that when the emergency of of thelength of time of non-use of the extin-ñre arises it is often impossible to operate the lire -guislier; to provideV a construction in which one extinguisher and disastrous results follows. end of the cylinder Íis enlarged wherebythe piston The important problem of the iire extinguisher >packing is not compressed and caused to takea permanent set when the extinguisher is not used for long periods of time; to provide a construc manui’acturer is to make an apparatus which is tion in which the piston maybe provided with - unquestionably Iwill operate immediately -when resilient felt packing rings which will retain their original size regardless of the length of time of leak-proof when the extinguisher is not in use and at the same time have an extinguisher which 2:0 non-use; to provide a construction in which the felt packing' rings provided around the piston serve as a centering means for the piston and thereby prevent metal to metal contact of the piston and cylinder in which it reciprocates; and' 25 to provide improved means for stripping the ñuidl from the piston rod so as to prevent slight leakf age or. dripping when the rod is reciprocated through its packing gaskets and which means is the emergency of fire arises. It is of course self evident that a nre-extinguisher from which the ?lre extinguishing duid has leaked or evaporated out or a nre extinguisher which is frozen and will not operate in case of an emergency are both ' worse than having no ilre extinguisher at all. The use of felt lpacmng rings on the working face of the piston tor making a ñuid tight seal with the cylinder walls has not heretofore been satisfactory for the reason that during long peri-g odsfor non-use the packing is held compressed by resilient and yielding so _as to not become frozen' 30 reason of- its tight fit in the cylinder and will on the rod by corrosion during long periods of thereby lose its expanding resiliency with the re non-use. sult that much slippage of fluid occurs past the An illustrative embodiment of this‘invention is piston during the pumping strokes. shown in the accompanying drawings, in which: In the present invention the well recognized » li‘lg.` 1 is a longitudinal medial sectional view, 35 dimculties have been entirely overcome by pro with the middle broken out, of a nre extinguisher viding a piston which has substantial clearance embodying the new improvements. > ' with the cylinder walls; providing the working '~ Fig. 2l is a sectional view taken on the line 2-2 of Fig. 1, looking in the direction indicated by the arrows. - ‘ ' , Fig. 3 is asectional view taken on the line 3-3 of Fig. 1. ’ ’ Flg._4 is a fragmentary sectional view of the face ofthe piston with felt packing rings, and then having the lower end of the pumping cylin 40 derfin which the piston normally rests when the . extinguisher is closed and not in use, of larger diameter than the remainder of the pumping cylinder with the result that the packing rings lower end _of the pumping cylinder showing the are not subjected to- any compression whatever sliding piston in a position on the piston rod op posite to that shown in Fig. 1. Fig. 5 is an enlarged, fragmentary, medial sec tional view of the improved fire extinguisher when the extinguisher is not being used. Fur thermore, the entire piston, when in the enlarged portion of the cylinder, will have suillcient clear- l _ ance'with respect to the cylinder wall to prevent the corroding together of the metal parts during rod packing glands and sealing means. 50 vperiods of lnon-use. When the extinguisher is As is well known in the ilre extinguisher> art, it `used the piston will be held centered in the cyl isboth desirable and necessary to have the piston, lnder by the packing rings and not have any which reciprocates in the pumping cylinder for metal to metal contact with the‘cylinder walls expelling theJ fluid from the extinguisher, nt with the result that freezing or sticking of the » showing the details of construction of the piston snugly with very close limits so that there shall iid-piston in the cylinder is impossible. 2 2,256,902 The lower end of the hollow shank 2| is flared out to provide a cylindrical sleeve 3I which sur roundsy the axially slidable sleeve 22 and which is provided with diametrically opposed axially ex tending inwardly presenting slots 32 and 33 which receive similarly disposed ribs'34 and 35 respectively which are integrally formed on the slidable sleeve 22 whereby the sleeve and handle ground into the faces or displaced so Athat a very are non-rotatably secu'red while permitting rela effective seal is secured whichis maintained un der spring tension during non-use of the ex 10 tive axial movement therebetween. The hollow shank 2I of the handle 2U is pro tinguisher with the result that it is impossible for vided with an axially extendinglbore 36 in which` the fluid to leak or evaporate out of the reservoir. is housed a helical compression spring 31, one Another problem encountered in the use of fire end of which -abuts the blind end of the bore 36 extinguishers having felt packing glands for the piston rod has been that of the fluid adhering 15 and the other end of which contacts an axially slidable iioating seal 38, th‘e inner face 39 of to the piston rod as it is drawn through the gas -vWith respect to sealing the reservoir against evaporation duringnon-use, this improved ex tinguisher is provided with a spring pressed seal in which the complementary contacting sealing faces are rotated while being axially compressed with the result that any dirt or foreign matter on the contacting face of the sealing parts is kets and then dripping off in the hands of the > which fits upon and closes one end of a discharge rosion. thereto. tube 43 when the handle is in closed position, _user during the pumping strokes. as shown in Fig. 5. ` ' In the present invention this objection has The opposite end of the discharge tube 40 is been overcome by having the helical compression 20 rigidly mounted in the inwardly projecting end spring, which compresses the rod gaskets, fit of the nozzle fitting 1 with the opening -there tightly around the rod, so that it acts as a re through communicating with the discharge open siliently gripping fluid stripper. Due to they yield ability of the spring, it may have a snug fit * ing 3, the tube 40 being concentrically disposed around the rod, but will not freeze thereto by cor 25 within the piston rod I4 and in spaced relation Y f ' The inner end of the sleeve I2 is interiorly In the construction shown in the drawings, a threaded to receive the exteriorly threaded axially cylindrical reservoir 5 has an integrally formed extending sleeve portion 4| of a fitting 42 which lower end 6 in the center of which is brazed or otherwise rigidly secured a nozzle fitting 1, having 30 is provided with an oppositely extending cylin drical sleeve Jportion 43 which has a free sliding an axially disposed discharge opening 3 formed fit on the piston rod I4. The> space between the therethrough. ' piston rod I4 and the sleeves I2' and 4I is pro-A ` The upper end of the reservoir is closed by a vided‘at its upper end with a felt gasket 44, a` cap 9 brazed or otherwise sealed thereto in which is a filler opening with screw closure plug, not 35 cork washer |45, and `a brass washer 45 bearing thereagainst. 'I'he gasket 44 is’constantly urged shown, in the usual manner of fire extinguishers in compression> around the piston rod I4 by a of this character. The cap 3 has an annular helical compression spring 46, which snuglysur collar or sleeve portion Iii, extending axially outwardly and having. an axial opening there- ' rounds and yieldingly grips the rod I4, so as to through, and a cylindrical skirt portion I2 which 40 strip the -fire extinguishing fluid from the rod during reciprocation thereof; One end of the extends axially inwardly from the cap. The compression spring 46 bears against the washer opening through the sleeve III has anv easyl work 45-and the other end thereof bears against a ing fit with a piston rod I4 which is slidable similar but smaller washer 41 which fits against therethrough. The outer axial face of thesleeve II forms a sealing face I3 which coacts with an 45 a felt gasket ring 43 disposed at the other end `oi? the- space, thus providing a double yielding annular ring gasket I5 carried by an annular sealaround the piston rod which is automatically . sealing member f6 which is rigidly brazed or tensioned at all times and which prevents sub otherwise secured to the piston rod I4. 'I'he stantial leakage of fluid around the piston rod member I6 comprises an axially extending cylin drical skirt portion I1 which embraces and'car 50 during its reciprocation when subjected to pump- ing action. ries the gasket I5,- and an oppositely extending The piston rod I4l is surrounded by a pumping cylindrical sleeve portion I3, the axial end of _ cylinder 49, one end of which is ñxed to a ro which terminates in an exteriorly threaded end tatable head 50 and the other end of which isr I9, A handle 23, having an axially extending hollow shank 2|, is threaded on the end I3 in 55 similarly fixed in a rotatable head 5I. A por tion of the lower end of the pumping cylinder 43 abutting relationship against a shoulder of the adjacent to the head 5I is of enlarged diameter, sleeve I3, to limit and position the parts.> as indicated at 52, and constitutes one of the An axially slidable sleeve 22 surrounds the an main features of the present application. The nular sealing member I 6 and piston rod I4 in spaced relation thereto and the upper end is pro 60 lower end of the piston rod I4 is exteriorly ing flange Á23 which is freely slidable on the sleeve portion I3 of the annular sealing member threaded and has screwed thereon the interiorly threaded end 53 of a tubular nipple 54. The nip ple 54, adjacent the end 53, has an annular I3. A helical compression spring 24 is provided shoulder 55 which serves as one limit stop for an vided with a radially disposed, inwardly extend in the space between the fixed sleeve I3 and the 65 axially slidable piston 56 which is carried on the nipple 54. The piston 56 is looselyl retained on slidable sleeve 22 and bears between the sealing the nipple 54 by an interiorly threaded cap 51 member I6 and the flange 23 of the sleeve 22. which is` screwed on to the exteriorly threaded 'I'he lower end oi' the slidable sleeve 22 is pro lower end of the nipple 54 and which carries a >vided with diametrically opposed radially ex tending lugs 25 and 23 which have cam surfaces 70 packing 53 therein retainedÍ by a thin washer 53. The circumferential working face of the piston on their upper axial faces for`interengaging with flange portions 21 and 23 integrally formed on the cap 9, openings 23 and 33 being provided in the flange through which the lugs may enter in the usual manner of bayonet connections, 33 is provided with an outwardly presenting pe ‘ ripheral groove which carries a pair of yielding or resilient felt packing rings 60. 'I'he sizes of the-piston 55, packing rings 60, enlarged cylin 2,256,902 der ene i: and cylinder as are such marine 3 reservoir into the tube 12 and heads 50 and 5I. The laterally extending weight arm of the head 5I is also provided with a radially extending port packing rings Il are compressed and have a snug , working tit in the smaller diameter of the -pump ing cylinder 49 and are free from radial compres sion and have clearance from» the walls of the ‘l1 controlled by a ball lcheck valve 18 which pro ' vides communication between the passageway 13 enlarged portion 52 of the pumping cylinder. Means are provided for admitting fluid _from and the lower end of the pumping cylinder 49. The head Il at its lower end is in slightly spaced relation to the discharge tube 40 and is the pumping cylinder 49 into the hollow piston rod I4 from whence it can pass into the upper end of the discharge tube 40 and thence out » provided with a relatively thin brass washer 19, the inner edge of which rides upon the tube 40 through the discharge nozzle opening 9 and 'and serves as a bearing for the head 5| which - comprise apertures 9| a'nd 62 in that part of the nipple B4 which is surrounded by the piston 59. has relatively little friction and thus permits free , rotation of the head with respect to the tube 4i).v A felt packing gasket 89 is interposed between The apertures are s_o positioned that on the up stroke of the piston rod the piston, when resting- 15 the axial face of the washer 19 and the opposed against the axial end face of the nipple Sl, will' Y axial face of the discharge nozzle`ilttlng 'l .for uncover the openings 9| so that fluid may pass preventing substantialY leakage of ñuid thereof, `thereinto, and upon the downstroke, when the it being understood that when the piston rod is piston is abutting against the shoulderv 55, Aas pushed downwardly, as viewed in Fig. V1 of the shown in Fig. 4, the iluid will enter through the 20 drawings, the friction betweenA the piston pack-A apertures 62. A by-pass port 63 is provided for ing 69 and interior wall of the pumping cylinder permitting part of the fluid within the hollow 49 will tend to slide the entire suction unit, com piston rod to pass back into the pumping cylin prising vthe heads 50, and 5i and pumping cylin-l der ‘49 to- help iìll the same on the downstroke of der 49 and suction tube 12, downwardlyl against the pump when the suction from-the reservoir 25 the packing 90 and tightly compress it so as to may not quite-lill the pumping cylinder 49. prevent leakage of iluid. Likewise during theA The head 50 which supports the upper end of ` thepumping cylinder 49 is provided with a felt packing ring or gasket 94 which is` retained by a relatively thin brass washer 65 secured on an annular radially extending seat by rolling over vthe metal at the edge of the opening which re ceives the washer, as shown at 69. vThe inner edge of the washer 65 rides upon the outer sur face of the axially extending sleeve portion 43 >which serves as a bearing for supporting the upper` end oi the suction mechanism and which bearing, having relatively small metal to` metal upstroke, the entire suction assembly Willmove axially upwardly and thereby cause the axial end , face of the sleeve 43 to compress the packing ring 54 and prevent leakage at this point of the fiuid entrapped within the- pumping cylinder 49. In the operation of` this ñre extinguisher, ther reservoir 5 is ñlled with fire extinguishing fluid through an opening in the head 9 (not shown) in the usual manner. During non-'use of the fire extinguisher- the cam lugs 25' and 26 are engaged under the inturned flanges 21 and 29, thus com pressing the helical spring 24 between the radi contact, will have a minimum of tendency to ally extending inturned flange 23 and the annu- ’ stick and present very little friction to rotation 40 lar sealing member I9 which is brazed to 'the' of the head, thus providing a structure which piston rod i4, thus compressingthe gasket I5 will have freedom from freezing by reason of between the sealing member i6 and the outer corrosion or the like. , ` The head 50 is provided with a laterally ex tending weighted arm having passageways there through with ball check‘valves which serve as suction ports for the pumping cylinder. 'I'he upper end of the cylinder 49 communicates with a radially extending port 61 controlled by ball valve 69 which leads to an axially extending passageway 99, _one end of which is controlled by a ball check valve 19 and which in turn com municates with a second radially extending port 1|, the outer open end of which lies closely ad jacent to the inner peripheral wall of the reser voir 5. The end of the passageway 69 opposite to the ball check valve 10 communicates with anaxially extending tube 12, the upper end of which is rigidly secured in axial alignment there axial face i3 of the sleeve Il. Thus a ñuid tight )fr eil'ective seal is maintained at all times which . will prevent leakage or evaporation of the fluid within the reservoir past or through the opening i in the sleeve Il around the piston rod i4, , When the handle is in the foregoing described closed and sealed position, the lower face 39 of :30 the ñoating seal 98 is tightly pressed against the upper end of Idischarge tube 40 by the helical compression spring 31, thus preventing any leak age or evaporation of fluid through the discharge Q tube 40 and nozzle opening 9 of the apparatus.` , When it is desired to operate the ñre extin guished, the reservoir portion 5 is grasped in one' v hand and the handle 20 in the other, and the handle rotated relatively to the reservoir until the cam lugs 25'and 26 are in registry with the - with, and the opposite end of which is similarly 60 openings 29 and 30 between flanges 21 and 28, secured to and communicates with an axially at which time the handle carrying the piston rod extending passageway 13 formed in the laterally I4 may be withdrawn or pulled out axially from extending weight arm of the head member 5|. the head endof the nre extinguisher. The lower end of the passageway 13 is likewise Inasmuch as the felt piston packing rings 6l) vprovided with a. ball check valve 14 which con have been i`n the enlarged end 52 of the pumping trols communication between the passageway 13 cylinder 49 during non-use of the i'lre extinguish and a radially extending port 15, the outer open er these packing rings will have remained their end of which lies closely adjacent to> the interior original size, and when drawn up into that part wall of the cylindrical reservoir 5._ n , of the pumping cylinder 49 having the smaller A metal rod 19 is housed within the tube 12 70 diameter, will make a tight ñt therein which will and-functions to tap the ball check valves 10 or prevent slippage of iluid past the piston. The 14 oiï of their respective seats when the fire -ex-piston 56 is-made of smaller diameter than the tinguisher is inclined either upwardly or down interior diameter of the pumping cylinder 49 Il wardly, as the case may be, thus insuringfree communication for the passage of iluid from the 75 so as to not make metal to metal contact there with and the piston will be held centered within 4 2,256,902 the pumping cylinder by the packing rings 69. During> the upstroke of the piston rod, the piston 56 will ride upon the axial end face of the nipple 51 thus uncovering the openings 6I and permitting ñuid from the pumping cylinder 49 to pass through said openings into the hollow pis ton rod I4, thence upwardly toward the handle and into the open upper end of discharge tube ing rings 69, being free from compression duringy such periods of non-use, will make a tight seal ing llt with the interior wall o_f the pumping cyl indexl 49 when drawn up into the smaller diame-v ter portion thereof which is the substantial pumping length of the cylinder. It will also be equally evident that when the handle 29 is forced downwardly so as to compress the spring 31, the floating seal 38 will effectively 40 which has been uncovered and unsealed by close the upper end of the discharge tube 49 and 10 withdrawal of the handle 29. During this up prevent evaporation or leakage of the fluid there ward stroke of the piston the ñuid which is in into. When the cam 1ugs'26 and 26 are rotated the pumping cylinder 49 is prevented from pass underneath the flanges 21 and 28, the sliding ing out around the piston rod I4 through the head 59 by reason of the stripping action of the ` sleeve 22 will'movev axially downwardly toward spring 46 and ther resilient felt packing rings 44, 15 the head 9, as shown in Fig. 1 of the drawings, thus compressing the spring 24 which'yieldingly 48 and 64. During such upward stroke fluid is holds the annular sealing member I6 and. gasket drawn into the lower end of the pumpingcylin I5 tightly upon the sealing face I3 offthe sleeve der 49 through the port 11 around the ball check . V ` valve 18, it being understood of course that fluid , member II. is drawn in andfills the passageways 69, tube 20 It is to be particularly noted that during this latter closure, the sealing member I6 carrying 12, and passageways 13 either through the radi .the packinggasket I5 is not only axially com ally extending ports 1I or 16 depending upon the pressed on its cooperating sealing seat, but by position of the nre extinguisher. If the discharge reason of the member I6 being secured to the end of the extinguisher is pointed down, then the ball check valve 19 will rest upon its seat, 25 piston rod`I4 and hence rigid with the handle 29, the contacting surfaces of the sealing mem as shown in Fig. 1 of the drawings, and the rod bers are rotated with respect to each other, thus 16 will tap the ball check valve 14 off of its seat grinding out any dust or foreign matter which and Athus open communicationthrough the in may be on their contacting faces and effecting a take port 16. Conversely, if the discharge end of the extinguisher is pointed upwardly, the ball 30 superior seal at this point somewhat analogous to a rotated grinding fit. of the contacting faces. valve 14 will rest upon its seat and the rod 16 _ The cylindrical sleeve portion I2 is provided will tap the ball check valve 19 off. of its seat with a plurality of axially extending slots or and thus provide suction opening through the notches 99 through which the fluid that is I When the piston has reached the upper limit 35 stripped from the piston rod I4 may return to the - interior of the reservoir. » of its stroke it is then forced downwardly by Although but one specific embodiment of this pushing in of the handle 29 at which time the invention has been herein shown and described, axially slidable piston 56 abuts against the shoul it will be understood that numerous details of der 55 of the nipple threaded on to the end of the piston rod I4 and thus opens communication 40 the construction shown may be altered or omit ted without departing from the spirit of this to the interior of the piston rod I4 through the invention as defined by the following claims. radial ports 62. As the fluid is forced into the hollow piston rod I4 and thence out through the 1. In a ilre extinguisher, a pumping cylinder, discharge'tube 49 a portion of it is by-passed a piston reciprocable in said cylinder for expell through the port 63 and into the pumping cylin ing fluid from said extinguisher, said piston hav der' 49 back of the piston so as to help i‘lll the ing a groove in its circumferential face and felt pumping cylinder‘on the downstroke, as it has packing rings in said groove, said cylinder having been found that during thisY downstroke, it is a portion of enlarged diameter and »the relative at times desirable to supplement the ñuid being sizes of said cylinder, piston, and packing .rings 50 brought in -through the port 61 around the check being such that said packing rings are under valve 68. ` compression when said piston is in the smaller During the downstroke of the piston, the fric diameter of said cylinder and are relieved of tion between the packing rings 694 and interior compression when said piston is in the larger Wall of the pumping cylinder 49 carries the en _of said cylinder. tire suction assembly axially downward, as 55 diameter 2. In a fire extinguisher, a pumping cylinder, viewed in Fig. l, so as to compress the gasket 89 a piston reciprocable in said cylinder for expell and thus prevent leakage of fluid from the lower ing fluid from said extinguisher, said piston hav endl of the pumping 'cylinder around the dis ing a relatively close working fit within said cyl- » charge tube 49 which would otherwise occur by inder, said cylinder having a portion thereof of 60 reason of the substantial clearance between the larger diameter than the remainder thereof, said outside of the discharge tube and the head 5I piston being normally positioned in said enlarged through which it passes. portion during non-use of said extinguisher and From the foregoing, it will be clearly evident . having suil‘lcient clearance with respect thereto -that it will be impossible for the piston ‘66 to become frozen to the interior wall of the pumping 65 to prevent the corroding together of said piston and cylinder during periods of non-use. cylinder 49 during long periods of non-use of the _ CHARLES K. HUTHSING. fire extinguisher, and furthermore that the pack port 1I.