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Publication numberUS722185 A
Publication typeGrant
Publication dateMar 3, 1903
Filing dateNov 18, 1902
Priority dateNov 18, 1902
Publication numberUS 722185 A, US 722185A, US-A-722185, US722185 A, US722185A
InventorsJames Robinson
Original AssigneeJosiah A Stratton, James Robinson
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Rotary pump.
US 722185 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

N0. 7 22,1's5. PATENTED MAR.3,1908.




No. 722,185. PATENTE'D MAR; 3, 1903.




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SPECIFICATION forming part of Letters Patent No. 722,185, dated March 3, 1903.

Application filed November 18, 1902. erial No 131,896. (No model.)

To ail whom, it may concern:

Be it known that I, JAMES ROBINSON, a citizen of the United States, residing at Elberon, in the county of Monmouth, State of New Jersey, have invented certain new and useful Improvements in Rotary Pumps; and I do hereby declare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which it ap- [O pertains to make and use the same.

This invention relates to pumps, and more particularly to the class of rotary pumps; and it has for its object to provide a construction of this nature from which there will be a prac- [5 tically even suction and discharge and in which the entire quantity of water taken up by each bucket will be discharged at each rotation and no water will be carried entirely around with the piston or buckets.

Other objects and advantages of the invention will be understood from the following description.

In the drawings forming a portion of this.

specification, and in which like numerals of reference indicate similar parts in the several views, Figure l is a perspective view of a pump with one cylinder-head broken away to show the piston and its buckets. Fig. 2 is a vertical section taken centrally through the pump at right angles to the axis of the rotatable bucket-carrier. Fig. 3 is an end elevation of the cylinder with one head removed and showing the position of two buckets and the relation of the air-dome thereto when the chamber between the buckets is its maximum size. Fig. 4 shows the buckets shifted to their positions of initial exhaust fromthe chamber therebetween.

Referring now to the drawings, the present 0 pump comprises a cylinder 5, having a suitable base 6, formed, preferably,integral therewith and having openings 7 therethrough to receive attaching means for holding the pump in place. The cylinder '5 has the two heads 8 and 9, between which and the ends of the cylinderare suitable packing-rings and which able manner. In the head 9 and vertically below the center thereof, so that it is eccentric thereto, is a recess 14, in which is journaled one end of a shaft 13, which has a bearing in the head 8, through which it projects and is provided with a pulley-wheel 22 to receive a driving-belt. Upon the shaft 13 is fixed a cylindrical carrier 16 of lesser diameter than the interior of the cylinder and which carrier moves with its lowermost portionin contact with the cylinder, while its uppermost portion is spaced downwardly therefrom, the-length of said carrier being such as to insure contact of its ends with the inner faces of the cylinder-heads. Formed longitudinally through the carrier 16 and me tending radially thereof at equidistant points are slots 17, the side walls of which are ,parallel, and in each of which slots is slidably mounted a bucket consisting of a flat rectangular plate 18, preferably of brass or other non-rusting metal, the length of the plate beingsuch as to insure contact of the ends thereof with'the cylinder-head. In the inner end of each of the plates is a recess 19, and in these recesses are disposed the outer ends of helical springs 20, the opposite end of which rests against the head of a pin 21, which is passed into the outer end of the helical spring and projects with its end into the recess of the plate, said pin-resting with its head against the bottom of" its'slot 17. The action of the helical springs is to hold the buckets normally and yieldablyprojected from their respective slots and with their outer edges in intimate contact with the inner surface of the cylinder, it being understood that as the carrier rotates the buckets will be moved gradually outwardly as they are carried upwardly until they project to the maximum at the uppermost point of the cylinder and will be then moved gradually inwardly by contact with the cylinder until they reach the lowermost point of the cylinder, when they will lie flush 5 with the carrier. The projecting end of the carrier-shaft is provided with a pulley-wheel 22 for engagement of a belt to rotate the carrier, and for admission and emission of water the suction and discharge pipes 23 and 24,

respectively, are provided. It being understood that the carrier is rotated to the right,

the suction-pipe communicates with the cylinder at a point Where its axis will be intersected by the buckets in their rotation just after the buckets have moved to a slight degree from the carrier, while the discharge-pipe communicates with the cylinder at a point spaced substantially three hundred and twenty degrees from the suction-pipe in the direction of rotation of the carrier or at a point where its axis will be intersected by the buckets when the latter have been pressed almost entirely into the slots 17.

As the carrier rotates and a bucket is carried past the suction-pipe the chamber bebind the bucket increases gradually in area and continues to increase until said bucket and the succeeding bucket are equidistant, respectively, from the discharge and suction pipes, and from this position the chamber behind the first bucket gradually decreases. The first bucket must, however, move substantially forty degrees before the water in the chamber behind it can be discharged and during which time the size of the chamber is diminishing. To compensate for the diminished size of the chamber and to prevent the water being forced backwardly past the rear bucket, or ifthere be no opportunity for leakage past the rear bucket to prevent the water jamming and stopping the pump, an air-dome 25 is provided and is located at a point substantially eighty degrees distant from the discharge-pipe in a direction opposite to that of rotation of the carrier. With this air-dome the excess of water is forced thereinto against the air-cushion of the dome until the advance bucket passes partly over the outlet-opening and permits the water to discharge.

To permit of priming the pump, an opening 26 is formed in the upper part of the cylinder and has a suitable closure 27 to prevent passage of water therethrough when the pump is in operation.

It is found that with a pump constructed as above described there is an even suction and an even discharge and substantially no part of the water is taken around with the buckets. A short groove 28 may be formed in the lower portion of the cylinder leading from the outlet-opening in the direction of rotation of the carrier to permit of backward passage of Water that remains in front of each bucket after the latter has passed the outletopening.

It will be understood that in practice modifications of the specific construction shown may be made and that any suitable materials and proportions may be used for the various parts without departing from the spirit of the invention.

What is claimed is- A rotary pump comprising a cylinder, a cylindrical carrier rotatably mounted eccentrically within the cylinder and in contact therewith, buckets slidably mounted in the carrier for movement radially thereof, means for holding said buckets yieldably projected in contact with the cylinder, inlet and outlet pipes communicating with the cylinder at opposite sides of and in close relation to the contacting portions of the carrier and cylinder, the spacing of said buckets being less than the major angular distance between the inlet and outlet, and an air-dome connected to and communicating with the cylinder.

In testimony whereof I affix my signature in presence of two witnesses.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3130673 *Aug 1, 1961Apr 28, 1964Finstad Arthur KRotary vane pump with replaceable head unit
US3643912 *Aug 11, 1969Feb 22, 1972Factory Mutual Res CorpDynamic shutoff valve
US4028885 *Apr 22, 1974Jun 14, 1977Ganley Thomas JRotary engine
US4251192 *Dec 7, 1978Feb 17, 1981Clark Alonzo RRotary pump with symmetrical by-pass and rotor with resiliently mounted vanes
US6958058 *Jun 5, 2003Oct 25, 2005Medsafe Inc.Methods and devices for pumping fluid and performing surgical procedures
Cooperative ClassificationF01C21/0845