US1893433A - Pump - Google Patents

Description

Jan. 3, 1933. J. R. MUIRHEAD ETAL 14,893,433

PUMP

Crginal Filedv Nov. 20, 1928 INVENTORS I0/LB@ nf. mais ATTOH NEYS Patented Jan. 3, 1933 UNITED STATES frATiiNifl",

JOHN ROBE MUImInAn, or KIaKcALDY, SOUTH AUSTRALIA, AND Joriiv WILLIAM MILLS, or ADELAIDE, SOUTH AUSTRALIA, AUSTRALIA PUMP Original application iiled November 20, 1928, Serial No. 320,616, and in Australia November 26, ,1927.

Divided and this application filed Augustl 8, 1930. Serial 110.474,004.

The application is a divisional application of our application Serial Number 320,616 filed th November, 1928 patented November 25, 1930, Patent Number 1,783,095.

This invention comprises a device for removing water, air or other 'fluid from av receptacle. In particular it has been devised for removing water or other liquid from a boat or the like, being applicable to boats propelled by any means, but its uses are in no way limited to that particular purpose.

Our device comprises as its essential features a tube having at or towards its one end a cylinder carrying within it an Archimedian or helical screw or a series of inclined blades projecting from a short shaft the one end of which projects beyond the end of the cylinder and carries a propeller Screw or other means whereby it is driven, and the cylinder having within or upon its one end a camshaped face or groove, and the shaft having upon it a projecting finger which engages and travels around such face or Vgroove and causes the Shaft and the helical Screw to make an endwise movement as Athey rotate. Preferably the tube has at or near its inlet end an inlet valve.

In order that our invention may be the more clearly understood we will describe the same with reference to the accompanying drawing which is more Or less diagrammatic and in which Fig. 1 is a plan view of our invention showing the helical screw pump upon the outlet end of the tube.

Fig. 2 is a sectional view of the helical screw pump to a larger scale.

Fig. 3 shows a modification of the construction shown in Figs. 1 and 2 wherein a handwheel is substituted for the propeller upon the end of the shaft.

In the drawing 1 represents a length of tube having near its inlet end an inlet valve 2, which may be a conventional type of foot valve commonly used in pumps and having upon its outlet end a cylinder 8 carrying within it an Archimedian or helical screw 9 or a series of inclined blades projecting from a short shaft 10 carried in bearings within the cylinder and the end of which projects beyondtheend of the cylinder and hasvupon i it a propeller screw 11 which extends beyond the circumference of the cylinder. Vithin the end of the cylinder 8 is a liner 12 having a cam-shaped face or end, andrupon the s haft 10 is afprojecting finger 13 which Vtravels around such face and causes the shaft the helical Screw and the propeller to make an endwise-movement as they rotate. A spiral spring 14 holds the finger 13 in contact with the camface. The cam-faced liner maybe removed andreversed if desired, the cam on the one end being of greater inclination than that upon the other, or the cam face may be formed upon the end of the cylinder. The end of lthe tube1with the cylinder 8 may be simply hung over the side of the boat and trail in the water, or it may be attached to the rudder or to ahanger frame and serve in place of the rudder, or the cylinder may be attached by va bracket to the bottom of the.

boat, in which case the inlet end of the tube may pass through the bottom of the boat. In any case, as the boat moves through the water the propeller or vanes are thereby caused to rotate and so rotate the helical screw or inclined blades and so draw thewater from the boat.

It has been found that the flow of water through a pump constructed according to Our invention is greatly increased over a screwtype pump of the same size in which no reciprocating movement is given to a helical screw impeller. Our pump can be operated at a much slower speed than a pump with a nonreciprocating helical blade and still produce an equal or greater flow of liquid therethrough.

According to a modification of the foregoing the propeller 11 incidentally .shown may be removed from the shaft and a hand Wheel or other operative device may be substituted therefor. In this case the cylinder will not be submerged in the water, but may be held upon the gunwale of a'boat or it may lie on the bottom and be driven by a flexible shafting in the delivery pipe worked by the propeller or otherwise, or the pump may be used in other desired positions.

1. A pump comprising a cylinder, an inlet valve for one end thereof, a rotatable and reciprocable shaft mountedconcentrically within said cylinder, a helical blade carried by and encircling a portion of said shaft within said cylinder, avliner secured within said cylinder having a t cam face t formed therewith, a finger carried by said shaft and engaging said cam face, and means for rotating said shaft whereby said shaft and screw will i have a reciprocating motion imparted thereto upon rotation thereof due to said finger travelling over said cam face.

2. In a device of the character described, a i

pump cylinder, an inlet tube communicating with one end thereof, an inlet valve carried by said tube, a rotatable and reciprocable shaft mounted concentrically within said cylinder, a helical blade carried by and encircling a portion of said shaft within said cylinder, means for rotating said shaft, a cam secured within said cylinder and providing a cam face and a finger carried by said shaft for engagement with said cam face, a spring normally urging said shaft in a direction to maintain said finger in engagement with said cam whereby to impart reciprocating motion to said shaft and helical blade upon rotation thereof.

In testimony that we claim the foregoing as our invention we have signed our names this 5 day of July, 1930.

JOHN ROBB MUIRHEAD. JOHN WILLIAM MILLS.

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