Патент USA US2108311код для вставки
Feb; 15, 1938. A. J. HARRIS 2,108,311 ' VARIABLE STROKE MECHANISM Filed Oct. 26, 1934 V 0: 5 Sheets-Sheet l Feb. 15, 1938. A. J; HARRIS ' 2,108,311 VARIABLE STROKE MECHANISM Filed‘ Oct. 26, 1934 s Shéets-Sheet 2 Patented Feb. 15, 1938. 2,108,311 UNITED STATES PATENT OFFICE ’ - \‘ " 2,108,311 ' '' VARIABLE STROKE MECHANISM Albert J. Harris, Chicago, Ill., assignor to Hills McCanna Company, Chicago, Ill.,- a corpora tion of Illinois Application October 26, 1934, Serial No. 750,057 2 Claims. My invention relates to pumps and particularly to chemical pumps having capacity adjustment to permit supplying diiferent proportionate amounts of liquid chemicals. The invention. relates in some aspects to liquid (CI. 74-40) tudinal adjustment so that its point of pivotal - connection with-piston I6 ‘may be varied, theme by changing its stroke and thereby causing a va riation in the length of the piston stroke to 'ac- ' 5 complish the desired variation in the amount of 5 , pumps covered by Patents Numbers 1,858,184 and liquid pumped to secure desired proportions in a 1,858,185, issued May 10, 1932, to C. O. Buenger chemical mixture or the like. This longitudinal of Chicago, Illinois. shifting of the yoke 8 and consequent change of One of the objects of the present invention is point of pivotal connection of said yoke with re 10 to provide a simple,v practical and advantageous ciprocating plunger I 6, has certain de?nite ad- 10 vconstruction of pump of the class speci?ed. vantages which will be pointed out later on. ' ‘ Another object of the invention is to provide While the longitudinal shifting ‘of this yoke 8 improved‘ and advantageous means for securing and consequent variation in the point of pivotal connection'with the reciprocating plunger could adjustment of the capacity of the pump. 15 _ Another object of the invention is to secure this adjustment without unfavorably affecting the stroke of the piston. ' Fig. 2 is a plan view of the same; Fig. 3 is a vertical elevation taken on the line 34 in Fig. 1; I one. construction which I have found very ad vantageous and satisfactory. Other objects of the invention will appear and be pointed out hereinafter. In the accompanying drawings: Fig. 1 is a side elevation of a pump embodying my present invention; 25 be accomplished in various ways, I show herein - ' Fig. 4 is a horizontal section taken on the line 4-4 in Fig. 1; ‘ , ' In this construction the yoke 8 is preferably formed of two side members lie-8“, which are arranged on opposite sides of the pump plunger l6, and these side members 8a are made in the shown in Fig. 4, and ?tted between the side mem bers 8*ik-8a and “provided with longitudinal side 25 slots to receive said side members 8“, as shown in Fig. 3, whereby the yoke 8 may be shifted along carriage l8 by sliding on the members 8*. The Fig. 5 is a vertical-section of the lower end of the pump cylinder; and‘ sides of the carriage I8 are arranged on opposite 30 Fig. 6 is a transverse section taken on the line‘ sides of piston l 6, as shown in Fig. 4, and provided 6--6 in Fig. 5. > 0 form of guides to support and guide a carriage l8 which is preferably made in U form, as with screws I9 which serve as pivotal pins for 0 In the accompanying drawings, I show a pump I pivotally connecting carriage l8 with piston iii.’ embodying a base | on which may be mounted an For shifting yoke'8, a rotary member 2| is pro electric motor 2 connected by a rotary shaft '8 35 to a speed reducing device 4. vided and arranged for rotation in a bearing 22 in carriage l8 but will be held against longitudi 'The speed reducing device 4 is'preferably pro» . nal movement by ring 23 ?tting in a recess in the vided with a rotary crank arm 5 whose outer end is pivotally connected at 5?‘to one end of a-link '40 6, the other end of link 6 being pivotally connect ed at l to a swinging yoke 8 which is pivotally connected at its opposite end by pivots 9 to swing ing arms i8 which are in turn pivotally connect ed at ii to the upper end of the pump case l2, which latter is secured by bolts H to a base IE 45 on the main base or platform I. The yoke 81s pivotally connected with the re ciprocating piston or plunger i8 which is ar rangedto reciprocate in‘ the piston cylinder or ‘ barrel I‘! on the case I2, being preferably formed integrally and as a part of said case l2. The rotation of crank arm 5, resulting in the actua tion of link 8 and swinging of yoke 8 about its fulcrum pivots 9, results in the reciprocation of plunger l6 and thereby effects the pumping act. 55 This yoke 8 is preferably arranged for longi end of rod 2| and in a co-operating recess in carriage l8. ' \ This rod 2i extends lengthwise of yoke 8 and out through an end member 24 thereon, being provided with a handwheel 25 at its outer end. Said rod 2| is screw-threaded and co-operates with the threads on cross-member 24, as shown in Fig. 4, whereby rotation of handwheel 25 will cause rotation of rod 2i and adjustment of said rod relatively to ‘yoke 8 by meansof threads on said rod 2| and member 24, and thereby cause the shifting of yoke 8 longitudinally along yoke bars 8' and the consequent change in the‘ point of pivotal connection of yoke 8 with the piston 50 rod or plunger i8. I Thus it will be seen that this longitudinal ad justment of yoke 8, with its effect of changing the point of pivotal connection between said yoke and reciprocating plunger It, has the eifect of 55 2 2,108,311 changing the point of application of power of the lever which is in e?ect formed by yoke- 8, and shortening or lengthening the length of le dividing the packing material 28 into two parts. verarm or part of the lever which acts upon I1, so that an inlet pipe for the liquid may be connected to one aperture 3! and an outlet pipe plunger I6 and thereby varies the length of stroke of said plunger “5. As handwheel 25 is turned to shift yoke ,8 to the right, (Fig. 1) the distance between pivots l9 and 9 is decreased, and consequently the effective length of lever 10 formed by yoke 8 is shortened and the plunger IE will have a shorter stroke. Likewise, a con verse shifting of yoke 8 to the left, (Fig. 1) will have the e?ect of increasing the distance be tween pi'vot pins 9 and i9, thereby lengthening 15 the effective lever arm operating on the piston l6 and lengthening the stroke of said piston. A marked advantage of this arrangement is that while the stroke of the piston is thus varied as desired to secure changes in the piston stroke and consequent changes in the pump output, the stroke or location of the piston or plunger is not‘ unfavorabiy affected, as has been the case in other constructions for securing variation in the plunger stroke. This is due to the fact that shift ing of yoke 8 to one side or the other retains the point ofpivotal connection between yoke 8 and plunger 16 at substantially the same height ~or elevation and so does not have the effect of varying the position of the piston, in the cylinder, 3O by bodily raising or lowering it and causing it to work in a different position in the piston cham ber, as is the case with certain other construc tions and arrangements for securing variation ' of piston travel. This present arrangement on the other hand has the effect of maintaining the piston plungerv in a substantially constant posi tion, changing only the length of stroke, notwith standing shifting in the point of connection of . piston with the yoke 8, and hence the piston will 40 Work in the lower portion of the piston cylinder where it is originally placed by adjustmentv of the parts, notwithstanding changes in the length of stroke of the'piston. Referring to Figs. 5 and 6, there is shown in those figures an arrangement for packing and cleansing the piston in the piston cylinder, so as to prevent the formation of solid material from ~the chemical solutions which would interfere with the proper operation of the pump. These ?gures show the piston rod it with its lower enlarged end) l6“ and the upper end of the piston cylinder or chamber I1, and a stu?ing box arrangement for the same. This stuffing box arrangement involves a packing gland 21 adapt ed to ?t in the upper end of cylinder I1, and pack ing material 28-28 arranged in the packing chamber, and a ring 29 also arranged in said chamber and surrounding the piston end 16a and This ring 29 has apertures 30 which are arranged opposite apertures 3| formed in the cylinder end for the same to the other aperture 3!, thereby permitting circulation of water or other liquid, if desired, through the packing gland to prevent freezing or coagulation of the ‘chemical mixture being pumped, and for other purposes if desired. It wil be understood that changes and modi ?cations may be made without departing from the spirit of the invention. What I claim is: ‘ , 1. Actuating means for a pump piston, com prising a power member having a rotarycrank arm, a link having one end pivotally connected with said crank arm, a piston-actuating lever pivotally connected withthe other end of said‘ link, said piston-actuating lever being in the form of a yoke extending crosswise of the piston and having members on opposite sides of the piston, a carriage along which the side members of ‘said yoke are slidable and provided with pivot pins forming a pivotal connection with the pis ton, swinging supporting links pivoted at one end to the end of said yoke opposite said link and pivoted at the other end to the piston cas ing, and means for adjusting said piston con necting carriage lengthwise of said yoke, said means comprising a rotary threaded bar or rod having one end connected with said carriage so as to permit rotary but prevent longitudinal movement, said threaded bar engaging a thread ed member on the yoke, and a rotary handle on said bar rod to turn the same and thereby cause said threaded'bar rod to adjust said carriage. 2. Actuating means for a piston. comprising a power member having a rotary crank arm, a link having one end pivotally connected to said crank arm, a piston-actuating lever pivotally connected with the other end of said link, said piston-actu ating lever comprising a pair of spaced parallel bars forming a pair of tracks, aU-shamd car riage embracing and pivotally connected to the 45 piston and embraced by said bars and engaging said tracks, means for advancing said lever with respect to said carriage comprising a screw mem ber engaging the bight portion of the U-shaped carriage and rotatable but immovable longitudi nally with respect thereto, a transverse bar join ing the two parallelbars, said screw being thread ed through said transverse bar so that upon turn ing of the screw the parallel bars are moved with respect to the‘ carriage, and a swinging fulcrum , for the piston-actuating lever. ' ALBERT J. HARRIS.