Sept. 24. 19461 ' 'w. F. THOMPSON I PUMP Filed Maren >13,- 1945’ G ' 2,408,109 Patented Sept. 24, ‘1946 2,408,109 ‘UNITED ,sTATgs’ PATEN T OFFICE 2,408,109 'I r _ PUMP Willis F. Thompson, vPortland, Maine, assignor to The Alden Speare’s Sons 00., Cambridge, Mass., 7 a corporation of Massachusetts . ' Application March 13, 1945, Serial No. 582,559, ' 3 Claims. (01. 103L478) 1 _ The invention relates to a pump especially adapted for the delivery of corrosive liquids from containers, such as carboys. . 1 Usually in pumps of this type thepumping op eration is effected by a piston having a piston rod by which the piston is reciprocated within a chambered cylinder. 7 The piston, rod, in order’ that it may be manually controlled,'extends out side the cylinder through a joint in an end piece, or head; which forms an end closure to the cham ber of the cylinder... The joint, through which the piston rod' slides, is open to the atmosphere, and customarily the joint is sealed in some way for preventing the escape of liquid from . the a chamber of the cylinder when the piston is being operated, and compression is ‘being developed within the chamber. The sealing of the joint may be effected in various ways; as bya packing to the bottom of the container»(not shown) from which the vliquid is to be Withdrawn, with up ' ward extension well above the heador mouth of the container. The bottom . end of the lower section 3 ofthe cylinder is provided with one or more cutouts 5 in order that liquid may enter the cylinder from the chamber of the container when the cylinder is resting on the bottom‘of the container. ' - Y ‘ The cylinder is provided at the lower end of its section 3‘ with an inwardly, opening valve which allows the entry of‘ liquid from the con tainer upon the upward stroke of the piston, later to be referred to, but closing upon its down ward stroke. The valvular structure comprises a valve seat 6 having a press ?t within the cyl inder. V1 is the valve adapted to have opening and closure, with relation to this seat. ' The stem formed by some suitable more or less elastic ma 8 of the valve extends through the annular seat, terial unaffected by acid, and which snugly em-_ 20 and is- provided with a cross pin 9 which engages braces the. piston rod sliding throughit. The the seat and limits the extent of opening of the ' , dif?culty with such a packing, however, especial valve as the valve is drawn to an open position. ly when the pump is being used for pumping‘ In its top end portion the cylinder is provided corrosive liquids, is that the packing is apt to go‘ exteriorly with a sleeve or jacket I!) which has a to pieces, or disintegrate.’ ‘In such case the cor 25 press ?t against the adjacent portions of the rosive liquid within the cylinder of the pump, due cylinder which it embraces. The jacket extends * . vto compression, is apt to spurt through the joint, upwardly beyond the end of the ‘cylinder, thus thus deprived of its packing, andcause serious 7 providing‘an annularsocket I l . injury to one operating the pump. ' , I At its top end the ‘cylinder is provided with a The object of the present invention is to elimi 30 baffle I2. ,This is seated to bear against the top nate this dii?culty by providing a pump which end ofthecylinder, and is held securely in place needs no packed joint .for its piston rod; the by an annular Washer l3 contained within the elimination 'of packing being the objective pur annular socket llwith press ?t against the ad jacent top end of the sleeve or jacket l0. The invention can best be seen and under 35 Located ‘within the cylinder, below and spaced stood by reference to the drawing in which-—. ' from the ba?le I2, is a de?ecting‘wiper plate M. Fig. 1 is a vertical section of a pump embodying A chamber I5 is formed in the cylinder between pose. ‘ the present invention. ' ' ' , ' . . p . Fig. 2 is a view partly in perspective of a por the bafflev and the plate. The wiper plate is pref erably, an inclined plate, inclined at substan tion of the pump shownvinFig, 1', and which 40 tially an angle of 45°.v In order to insert the wiper shows essentially the way in which the objective plate the top end of the cylinder is made section purpose of the invention‘is‘accomplished. . _ al, there being provided an angularly cut end Referring-to the, drawingfl represents the chambered cylinderéofevthe- pump. 'The top end . piece ,2'_;wh:ich-is held securely in place for re tainingjthe de?ecting wiper plate by the sur of the cylinder is closed in manner later to be 45 rounding sleeve or jacket l0. described. ' . ‘ The cylinder, for convenience in packing, is Extending from the cylinder adjacent the wiper plate is a pourout nozzle or spout l6 through preferably made in two sections, of which 2 rep-' which the liquid ‘exits‘from the chamber of the resents the top section and 3 the bottom section. cylinder. The spout is preferably of a relatively The two sections are united by means of an in 50 large outlet capacity. The inner end of the spout ternal sleeve 4 having a press ?t into the top end extends through the cylinder and the jacket and of the section 3, and threaded ?t, into the ad makes threaded connection therewith, thereby as jacent bottom end of section 2. V ' sisting in holding the jacket securely in place. The cylinder as a whole is made of some con Surmounting thetop'endl of the ’cylinder and _ ' slderable length in order that it may extend down 55 having substantially its same tubular form, is a 2,408,109 3 4 is effectively stripped from the piston rod by the hand grip [8 within which is inset a plug [9 into ba?ie l2. which is threaded the top end of a piston rod In consequence, though some slight moisture may remain upon the piston rod beyond 20, the hand grip forming the means by which and above the baffle, yet spurting of the liquid is entirely eliminated and danger of such avoided. the piston rod and piston borne by it is recipro~ cated. The piston rod extends through the baffle l2 Any liquid that may accumulate in the socket I I above the baflle may escape, into the chamber I5 below, by way of a small opening 21 at the and de?ecting wiper plate M with easy sliding ?t. ' side edge of the baffle. Liquid accumulating with The piston comprises an internal sleeve 2| slid able within the cylinder, and with which co-oper .10 in the chamber [5 between the deflecting plate ates an annular valvular head 22 having a stem " and the ba?le will be drawn out of this chamber 23 which extends into the end of the piston rod '_Q ; through a small opening 28 at the extreme bottom end of the chamber on the downward stroke of and to which it is secured by a cross pin 25. The pin 25 lies above the sleeve 2|; the head 22 below I claim: ‘ , , it. The diameter of the head, as well as the thepiston. » mechanism which includes a reciprocating piston 20 the sleeve. The’ combined head andsleeve will r 1. In a pump having a cylinder and operating length of the pin, is less than the diameter of the ‘ cylinder. The head is of such diametrical extent,‘ however, and the pin is of such length, that they will, respectively, engage the sleeve for moving it within the cylinder when the piston is reciprocat ed. The head is spaced from the pin a distance longer than the length of the sleeve, so that when thepiston rod is raised the head will be brought into closed engagement with the bottom end of ' and piston rod, means forming an end closure for tlce cylinder through which the piston rod slidably extends, and comprising a baffle plate and a de?ecting plate both ?xedly arranged within the cylinder and spaced from one another to form with the cylinder a chamber interposed between said plates, the de?ecting plate forming the bot 25 tom of said chamber having within it a vent open ing by which liquid‘ accumulating within the then operate as a piston and induce a partial chamber may be withdrawn from it during the vacuum in the chamber of the cylinder below the downward reciprocation of the piston. I piston, causing liquid in the container to enter 2. In a‘ pump having a cylinder and operating the chamber by way of the valve 1, then drawn mechanism which includes a reciprocating piston open, and ?lling the chamber of the cylinder up 30 and piston rod, means forming an end closure to the point of the ascending piston. During this for the cylinder through which the piston rod operation undisplaced liquid contained in the slidably extends, and comprising a ba?le plate and chamber of the cylinder above the ascending pis a de?ecting plate both ?xedly arranged within ton will be forced to outlet through the spout l6. Upon the return of the piston, through low 35 the cylinder and spaced from one another to form with the cylinder a chamber interposed between ering of the piston rod, all in?ow of liquid from the container will cease. said plates and having within it a vent opening by which liquid accumulating within said cham ber may be withdrawn from it during the down The valve 1 will be closed. The head 22 will separate from the sleeve thereby forming a communication through the piston so that liquid in the chamber of the cyl inder lying below the piston may enter that por tion of the chamber of the cylinder lying above the piston. The pin 25 will be ‘brought into en gagement with the sleeve, moving it downwardly through the chamber of the cylinder to the limit ward reciprocation of the piston, the ba?ie plate forming the top of said chamber'occupying a po sition substantially normal ‘to the line of move ment of the piston rod, the de?ecting plate form ing the bottom of said chamber being arranged in an angularly inclined position with relation to the line of movement of the piston rod. 3. In a pump having a cylinder and operating of the downward stroke of the piston rod, which is limited by the engagement of its hand grip IS with the top end of the cylinder, entering through mechanism which includes, a reciprocating pis ton and piston rod, means forming an end closure the socket ll at the top end'of the cylinder. In. the operation of the pump during the up- - ward stroke of the piston, especially if the piston is rapidly reciprocated, considerable liquid pres sure will be formed in the chamber of the cylin der although the ample capacity of they spout :30 will assist in relieving this pressure. I Liquid clinging to the piston rod as it is. raised to pass through the de?ecting plate I4 will be struck by the de?ecting plate and in large meas ure be wiped off the rod. This e?ect is enhanced by the angularity of the de?ecting plate which is preferably angularly arranged, as previously ex plained. Liquid that is not wiped off by the de ?ecting plate, and remaining upon the piston rod, will, due to its surface tension, assume in the chamber [5, droplike or cylindrical shape which for the cylinder through which the piston rod slidably extends, and comprising a baii‘le plate and a de?ecting plate both-?xedly arranged within the cylinder and spaced from one another to form with the cylinder a chamber interposed between said plates, the ba?le plate forming the top of said chamber occupying a position substantially normal to the line of movement of the piston rod, the de?ecting platev forming the bottom of said chamber being arranged in an angularly inclined position. with relation to the line of movement of the piston rod and having within ita vent opening by which liquid'accumuiating within said cham ber may be withdrawn from it during the down ward reciprocation of the piston. 65 . ‘ WILLIS F. THOMPSON.