US 1770683 A
Description (OCR text may contain errors)
July 15, 1930. K. DAVIS 1,770,683
Original Filed April 19, 1926 4 Sheets-Sheet l t/l :EVENTOl l ATTORN K. DAVIS July 15, 1930.
Original Filed- April 9, 1926 4 Sheets-Sheet km NW ATTOR July 15, 1930. K. DAVIS 1,770,683
Original Fi p il 19, 1926 4 Sheets-5heet 4 IN V EN TOR.
Patented July 15, 1930 UNITED STATES PATENT OFFICE KENNETH DAVIS, OF EBENSBURG, PENNSYLVANIA, ASSIGNOR TO REMBRANDT PEALE, OF ST. BENEDICT, PENNSYLVANIA, W. SANDERS DAVIES, OF NEW YORK, N. Y., AND WILLIAM S. WALLACE, OF PHILADELPHIA, PENNSYLVANIA, TRUSTEES PUMP Original application filed April 19, 1926, Serial No. 102,905. Divided and this application filed June 24,
1929. Serial No. 373,393.
I The invention relates to novel and useful improvements in reciprocating pumps, and more particularly, in some aspects thereof, to duplex single-acting pumps, although in certain of its features, the invention is applicable to other kinds of pumps.
Objects and advantages of the invention will be set forth in part hereinafter and in part will be obvious herefrom, or may be learned by practice with the invention, the same being realized and attained by means of the instrumentalities and combinations pointed out in the appended claims.
The invention consists in the novel parts, construction, arrangements, combinations and improvements herein shown and described.
The accompanying drawings, referred to herein and constituting a part hereof, illustrate one embodiment of the invention, and together with the description, serve to explain the principles of the invention.
Of the drawings Fig. 1 is a side elevation of a pumping mechanism embodying the invention;
Fig. 2 is a full vertical, longitudinal section taken substantially on line 2-2 of Fig. 3;
Fig. 3 is a full horizontal section, taken substantially on line 3-3 of Fig. 2;
Fig. 4 is a full vertical, longitudinal section through a somewhat different form of the pump mechanism and shows the motor in elevation. I
The invention is directed to providing a pump which is sturdy, inexpensive, compact, powerful and reliable, which requires the minimum of attention, and is especially adapted for work in mines, quarries and in other places and duties where continuous running with almost no attention and super vision are essential requirements.
In the present preferred embodiment, broadly considered, the invention is applied to a duplex single-action pump, wherein the pistons are driven from'a motor in a very direct manner and by an exceedingly. simple and sturdy mechanism.
In said embodiment, the piston rods of two pistons are connected to reciprocable yokes,
close at either side of a Worm wheel, or other suitable gear wheel, the wheel having on either side wrist-pins, reciprocable in the yokes. The wheel has bearing on the outer sides of each of the reciprocable yokes, these bearings comprising arms extending from the ends of the wrist pins radially of the wheel, and terminating in short shafts, con centric with the worm wheel, and rotating 1n hearings on the frame. 7
In the present embodiment, also, and in accordance with one feature of the invention, the piston rods are reciprocably supported in the frame, and the yoke guides are especially adapted to take up the side thrust created by the drive, although the yoke guides could be used for both purposes if desired. The present drive comprises a worm and worm shaft, the worm driving on the worm wheel, which directly actuates the piston rod. The motor is. connected directly to the worm shaft, and the worm shaft is preferably provided with a thrust bearing.
In connection With the duplex cylinders, there may be provided any suitable form of inlet and outlet valves and valve chambers, which are here shown as built in accordance with the disclosure of my prior application Ser. No. 102,905, filed April 19, 1.926 of which this-application is a division.
The foregoing general description, and the following detail description as well, are exemplaryand explanatory of the invention, but are not restrictive thereof; and exemplify the present preferred embodiment of the various features of the invention.
Referring now in detail to the embodiment of the invention, illustrated by way of example in the accompanying drawings, the invention is exemplified in a pump having two single-acting, open-end cylinders l and 2. These are preferably formed of a single casting, having supporting webs F and 4, and a base plate 5 resting upon the to of the bed plate 6 of the pump, and fastened thereto by screw bolts 7. lVithin the cylinders. respee tively, are pistons 12 and 13, and corresponding piston rods 14 and 15, which may be of any suitable or desired form of structure.
The pistons, as embodied, comprise respectively a packin -supporting body member 16, having a re uced cylindrical portion 17 and a fiat end portion 18, the latter having a flange 19 extending be end the cylindrical part 17 of the bod T e piston body 16 is centrally aperture and is thereby mounted upon the piston rod, and abuts upon a suitable stop, such as a flange or cap nut 20. The cylin rical body 17 and the flange 19 serve as a support and seat for the packing 21 of the piston.
To hold the packing 21 in position, and to create and regulate the pressure thereon, a plate 22 is provided, central y apertured and thereby mounted upon thr piston rod, the plate 22 being pressed against the packing 21 by suitable means, such as a nut or nuts 23 screw-threaded upon the piston rod. The piston rods 14 and 15 project from the open ends of the cylinders 1 and 2, andthe pistons are thus rendered readily accessible for packing, as will be clear from Figs. 2 and 3.
Referring now to the fluid-controlling mechanism, as at present preferably embodied, a plurality of chambers are provided into which the rear ends of the cylinders 1 and 2 0 en, a portion of the inlet and outlet valve c ambers being preferably an integral casting with the cylinders themselves. In Figs. 1 to 3, the vertical rear wall 31 of the valve chamber is integrally cast with the cylinder.
An inlet pipe 32 communicates into a bottom chamber 33, which extends across the pump, and communicates with both inlet valves 34 and 35 of the respective cylinders 1 and 2. 1 These valves comprise respectively (the description of one valve being sufficient) a port 36, which is preferably provided with an insert and removable annular valve seat, slightly beveled so as to fit firmly and accurate yin the apertures 37 the interior of these members forming the valve port.
The valve com rises a flat disc 41, having a hub 42, which is internally centrally apertured, and which is reciprocable upon a cylindrical guiding pin 43. This pin is screwthreaded into a boss 44, integral with, and extending downwardly from, a bracket 45, which bracket is formed integral with, or' is mounted on, a removable plate 46. The valve,
41 is provided with packin 47 which cooperates with the ring 37 of t e valve seat, and the valve is held resiliently down by a helical spr' 48, encircling the'rod 43 and in com ress on between the valve disc 41 and the racket 45.
These inlet valves are located, respectively, in separate chambers 51 and 52, there being a partition 53 between the chambers and between the top wall or diaphragm 54 of the inlet pipe chamber and the bottom wall or diaphhra I 55 of the outlet pipe chamber.
0 eh a mbers 51 and 52 are apertured at their front sides and thus open into the corresponding cylinders 1 and 2, and their tures.
rear walls are the o enings which are closed by the hand-hole p ates 46 and 46, already described. The corresponding plates 46 and These plates are held in position by suitable means, such as a common yoke 56 pressing upon the two plates, and clamped thereagainst by suitable devices, shown as a screw rod 59 screw-threaded into the chamber structure, the clamp 56 being apertured to ass thereonto, and being clamped in place y a nut 60. The edges of the plate 46 are preferably flanged to fit close y on their apertures, and are provided with gaskets or other water-tight packing 61 around the edges, and also with alining pins 62 which pass into corresponding holes in the structure of the chamber.
It will be noted that the valves are exceedingly easy of access, as when a late 46 is removed, the valve 41 is removed t erewith, and the seat 37 of the valve is accessible through the o ening or port in the wall of the valve cham er. When the plate 46 is returned to position, the aliningmeans, including the edge flanges and the pins 61, will accurately aline the valve 41 with respect to its seat.
Referring now to the outlet chamber and its valve mechanism, the outlet chamber 71 extends entirely across the valve chamber structure, and is provided with two outlet valves 72 and 73. These two valves communicate, respectively, with the separated chambers 51 and 52, wherein the respective inlet valves are located and, into which they discharge. The outlet valves are of the same general structure as the inlet valves having annular valve seats 74, which are slightly beveled to set firmly and accurately in the chamber structure.
The valve discs 75 have packin rings 76, cooperating with the valve seats 4. These discs likewise have centrally-apertured hubs 77, and iding pins 78 extend into the aper- These pins are fixed, respectively, to brackets 79, which in turn are carried upon the corresponding closure plates 80 and 80" which fit into openings on the rear of the valve chamber. The valves 75 are reciprocable alon their guide rods 78 and are resiliently hel in the closed position by helical sprin .85, encircling the corresponding guide rods 7;, and are in compression between the valve disc 75 and the bracket 79.
The closures 80 and 80" may be the same in structure as the corresponding closures 46 and 46, and may have clamping and locking yokes 81, the same as the locking yoke 56, which need not be described in detail. The closure plates '80 are also provided with flanged ed es having gaskets or other watertight packln and alining means the same or similar to t ose already described. These valve mechanisms are asreadily removable, repairable and alinable, and the valve seats are as readily accessible, as the inlet valves previously described.
Referring now to the actuating means for the pump pistons, the pistonrods are prefer ably reeiprocably supported, respectively, in apertured hubs or bosses 99 and 100,.having, respectively, bushings 101 and 102 there- Within; The outer ends of the piston rods are screw-threaded, respectively, into internally-threaded bosses 105 and 106, formed in vertically disposed yokes 107 and 108.
The yokes may be of any suitable or convenient form, but as shown comprise opposed, parallelly-arranged side guiding members 111 and 112, and end-tying and spacing members 113 and 114, each rabbeted to receive the ends of the guiding members and to hold them in alinement. The yoke structure is held together by any suitable means as by screw bolts 115.
There are preferably provided, although not essential, supporting and guiding rods 121 and 122, which have their inner ends screw-threaded into internally screw-threaded bosses 123 and 124, formed respectively on the outer face of the rearward guide members 111 of the respective yokes. These rods are reciprocably supported, respectively, in corresponding internally-a ertured bosses 125 and 126, which are pre 'erably provided with bushings 127 and 128. This structure provides a balanced support and guidance for the piston rods and their actuating yokes.
In the embodied form of means for actuating the pist0n-rod actuating yokes, a gear wheel 141, preferably a worm wheel, islocated between the yokes, the yokes being closely contiguous to the gear wheel at either side thereof, and the gear Wheelhaving reciprocable connections with the yokes to actuate the pump piston rods. As embodied, there is fixed to, and projecting from, either side of the gear wheel two wrist pins 142 and 143, and these are preferably removably mounted on the gear wheel. For this purpose they are fixed on circular flat platesl44 and 14?, respectively, set into, and bolted to, the opposite flat sides of the worm-wheel 141.
The wrist pins 142 and 143 are rotatably mounted in respective guiding blocks 149 and 150, which blocks fit slidably within the guide openings of the corresponding yokes. These blocks 149 and 150 have flanges 153 overlapping the side edges of the side guide members of the yokes, as best shown in Fig. 3. The blocks 149 are preferably centrally split, for the purpose of convenience in assembling, and are held together by screw-bolts 155, having their heads countersunk in one of the split halves of the respective blocks.
To rotatably support the gear wheel, and to provide a simple, compact and sturdy driving mechanism, crank arms 163 and 164 are formed on, or are attached to, the outer ends of the wrist pins 142 and 143, respectively,
and these arms extend radially inwardly with respect to the gear wheel 141. At their inner ends the arms 163 and 164 are provided, re-
speetively, with outwardly-extending short shafts 165 and 166, which are concentric with the gear wheel 141, and are journaled respec-' tively in bosses 167 and 168, formed in the gear case, and provided with bushings 169 and 170.
To prevent side thrust in the driving mechanism, the reciprocable yokes 107 and 108 are provided with longitudinally-disposed guides at one end or at both ends of the respective yokes. These guides comprise a plate 175, bolted either to the bed plate of the pump or to the gear housing or casing. These guide plates are provided on their inner surface with guideways having bottoms 176 and side guide-walls 177 and 178, within which the ends of the respective yokes have a close sliding fit. The gui-deways may be formed also, if desired, to support and guide the yoke as well as to merely act as sidewise guides and side thrust absorbing means. The housing 179 for the piston-driving mechanism may be kept full of oil and the entire driving gear run in oil. The casing may be provided with a hand hole and closure 180.
In the present preferred embodiment, the drive is direct from an electric motor 181, by means of a flexible coupling 182, onto a worm shaft 183, having a worm 184, meshing with the worm-wheel 141. The worm is shown j ournaled in a long boss bearing 185, formed in the gear casing and provided with a flange bushing 186,"against which one end of the worm rotates. There is a spacing collar 187 on the shaft exteriorly toits bearin and the worm is fixed on the shaft by a suita 1e spline and by a locking nut 188. The worm shaftcylinder body. There is thu s provided a replaceable wearing element within the cylinder. The valve chambers and communicating inlet and outlet chambers comprise preferably a single casting 200, integral with the pair of cylinders, the casting being apertured in the most advantageous way for strength, simplicity and accessibility. This integral casting comprises an intake chamber 201, extending transversely entirely across beneath sleeves abut respectively against shoulders'199, formed in the corresponding.
bers just over the intake chamber, there are 'respectively, beveled circular openings in which are fixed annular valve seats 209 and 210, which may be of bronze or other hard and non-corroding metal. The chambers are separated from each other by an integral ver tically and longitudinally disposed central partition 211, extending upwardly integrally from the floor of the inlet valve chambers to a horizontally-disposed integral partition 212,
extending entirely across and constituting the to of both inlet valve chambers, from one si e wall to the other.
Above this horizontal wall 212 the side walls of the casting extend upwardly to constitute an outlet or discharge chamber 211. In the horizontal wall or partition 212 there are two openings in which are fixed, respectively, the conoidal annular valve seat 225 and 226 for the discharge valves. This chamber may be provided, if desired, with discharge ports 227 and 228 at either side thereof, which connect with suitable pipes 229 and-230.
For convenience in assembling and accessibility, the intake valves are mounted in a cover plate 223 for the rear wardly facing opening. at the back of the two valve chambers 207 and 208. This cover plate is fastened to the chamber casting by suitable means, such as a plurality of screw bolts 234. On the inner face of the cover plate 223 are two integral, inwardly-extending brackets 235, one extending into one valve chamber and the other extending into the othervalve chamber. Screwed into each bracket is a downwardlyextending guide pin 236. The intake valves 237. respectively, are mounted on these pins, and operate substantially in the manner of the intake valves already described, and further detail and description is unnecessary. The valves may thus be removed by loosening and removing the cover plate, and are reinserted and alined by replacing and fastening the cover plate. 4
The top of the common outlet or discharge chamber 221 is closed by a top cover plate 239, which is fastened in place by a suitable means such as screw bolts 240, screwing into the top edge of the vertical walls of the chamber 221. This cover plate serves as a mounting for the outlet or discharge valves. For this purpose, guide pins 241 are screwed into the cover plate, extend downwardly within the chamber 221, and serve as guides for the outlet valves 242 and 243, respectively. The structure and operation of these valves is otherwise substantially the same as those alread described, and need not be described in furt er detail. This provides a structure of great strength, with few parts, and affords a maximum of accessibility, with ease of aseselnbllng and disassembling.
The piston structure may be alike for both cylinders, and in this fornrcomprises a main piston. head, having an externally-threaded cylindrical hu-b 251, which is seated against a shoulder formed near the inner end of the piston rod 252, the hub 251 encircling the cylindrical reduced portion 253 of the rod.
The piston head extends from the hub in flat disc form, which terminates in a cylindrical portion 254, and this cylindrical portion terminates in a laterally extending flange porwardly-projecting flange 262, which engages with and compresses the packing 256, making a tight connection for the piston within the cylinder. Locking nuts 263 are screwed onto the hub 251 to hold the member 262 in positioni This structure is easily accessible for repacking.
Referring now to the actuating means for the piston rods and pistons, each of the pistons is shown fixed to the central part of the front reach 271 of respective vertically-arranged, horizontally-reciprocable yokes 272 and 273. These yokes are guided and supported both at their tops and bottoms, to avoid side thrust or displacement. With this in view, yoke 272 is longitudinally grooved on its upper and lower faces. Longitudinally and horizontally disposed guides 277 and 274 project from the floor and top of the housing, respectively, and work in these grooves, the guides serving to guide the yokes and to absorb both at the top and bottom any tendency to said thrust in the yoke.
The yoke 273 is likewise provided on its 'top and bottom surfaces with similar guiding bottom of the housing, respectively. These likewise guide the yoke 273 in its travel and also absorb any tendency to side thrust.
The motive power for the pump is provided by a worm and worm wheel drive from an e ectrical motor, just as in the form already described. The worm wheel 285 is cylindrically recessed on either side-face, and is centrally apertured. Into these recesses, at either side, fit circular plates 286 and 287, which are bolted to the worm wheel. From plate 286 projects double crank arm 288, the first arm being fixed concentrically to plate 286, and extending radially outwardly. This arm terminates in a central wrist pin 289, which is rotatably mounted in a slidable block 290, reciprocably mounted in the central opening of yoke 272. The block 290 is provided at either side with guiding flanges 291 and 292, which serve to guide and maintain it reciprocably in position with the internal opening of the yoke.
Fixed to and extending inwardly radially from the outer end of wrist pin 289 is a crank arm 293, tenninating in a crank shaft 294,
concentric with the worm wheel, and journaled in a suitable bearing in the casing or housing.
On the opposite side of the worm wheel, the construction is the same. The plate 287 is provided with .a similar double crank arm, and reciprocating guide block in the inner opening of yoke 273, and need not be described in detail, the same referencepumerals being applied thereto.
The Worm 301 in this case is provided with bearings 303 and 304 at either. end of its shaft 302, journaled in the upper part of the housing, and the bearing 304 may be a thrust hearing. A flexible coupling 305 connects the worm shaft to the shaft 306 of the motor 307.
For convenience in construction, assembling and operation, the casing or housing 308 for the drive is preferably split centrally and horizontally, as is'clearly shown in Figs. 6 to 8, with abutting flanges 309 and 310 fastened by bolts 311, the bearings for the crank shaft being formed in the two halves, and the bearings for the worm shaft being in the upper half. The housing may be run about half full of oil or grease to keep the part lubricated.
From all the foregoing it will be understood that' a mechanism has been provided constituting an exemplary embodiment of the invention, and realizing the objects and ad-' vantages herein set forth, together with other objects and advantages. It will be under- I stood further that departures may be made from the exact mechanism as shown and described, within the scope of the accompanying claims, without departing from the principles of the invention and without sacrlficing its chief advantages.
What I claim is 1. In ower-transmitting apparatus the combination of a casing consisting of body eratively connected within said casing with such crank, and means for rotating said shaft.
2. In power-transmitting apparatus the combination of a casing consisting of body and cover, a shaft extending within the casing and journalled between suchbody and cover and provided within the casing with a crank, a pair of rods borne one by the body of the casing and one by the cover and when the parts are assembled extending in parallelism one with another and in a common plane to which said shaft lies perpendicularly and on opposite sides of said shaft, a scotch yoke borne by said rods and connected to the crank with which said shaft is equipped, and a reciprocable rod extending through the walls of said casing and engaging said scotch yoke.
3. In power transmitting apparatus the combination of a casing consisting of a body and a cover, a crank shaft extending within the casing and journalled between the meeting edges of body and'cover, a reciprocable rod extending through an orifice in the casing Wall formed by and between the meeting edges of body and cover, said rod extending when the parts are assembled perpendicular to the crank shaft, two rods borne one by the body of said casing and the other by the cover and when the parts are assembled extending on opposite sides of said crank shaft and parallelone with another and with said reciprocable rod, a scotch yoke borne by and reciprocable upon said rods and operatively connected both to said crank shaft and to said reciprocable rod, a rotatable shaft j ournalled "in the cover of said casing, and driving connection between the last-named shaft and said crank shaft and arranged within said casing. In testimony whereof, I have hereunto signed my name tothis specification.
and cover, a shaft extending within the casing and journalled between such body and cover, a reciprocable rod extending through an orifice in the casing wall formed by and between the meeting edges of body and cover, the said shaft being rovided within the casing with a crank an the said rod being op-.