US513315A - Charles edwin funk - Google Patents

Description

GQE. PUNK.`

(No Model.)

PUMP.

Patentedan. 23, 1894.

ms Nlmonu. LIYHDGMPNINB column' IINTTnn STATES CHARLES EDWIN FUNK, OF CHICAGO, ILLINOIS.

PUMP.

SPECIFICATION forming part of Letters Patent No. 513,315, dated January 23, 1894.

Application filed March 7, 1893. Serial No. 465,023. (No model'.)

T0 all whom it may concern:

Be it known that I, CHARLES EDWIN FUNK, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Pumps; and I do hereby Va cylindrical casing, an elastic tube within the casing adjacent to the outer wallof the same and having inlet and outlet ends extending out of the casing, and a traveling'pressure device affordinga moving pressure on the elastic tube and serving thereby to force a continuous stream of iiuid through the said tube. As is well known, the suction of such pumps depends upon the elasticity of the walls of y the tube whereby said tube, after being flattened by the traveling pressure device, tends to resume its normal shape and to thus afford a vacuum into which the fluid rushes from the source of supply. Obviously, then, in order to get a strong suction the walls of the tube mustbe of considerablethickness in-order that they may have a powerful tendency to resume their normal shape after being fiattened, it being evident that a very thin tube would not resume its tubular form at all but would remain flattened after the first passage of the traveling pressure device, and render the pump entirely inoperative.

Heretofore in the construction of pumps of this character the elastic tube has been provided by bending a piece of ordinary tubing to conform to the curve of the casing and then inserting it within said casing. This method of construction necessitates either the use of a smaller and thinner tube than is required to secure a pump of maximum efflciency, orthe employment of a casing of large diameter in proportion to the diameter of the tube. The reason for this lies in the well known fact that the bending of a tube compresses the material on the inner side of the bend and elongates that upon the outside of the bend with the result ofl lessening, to a greater or less extent, the capacity of the tube to resume its normal shape after being compressed, accordingly assaid bend is more orless sharp. Consequently if the casing is made of i consequent tendency of that portion of the wall to expand toward the outer side of the bend in order to relieve the compressive tension on said inner wall of the tube, will readily respond to the outward pressure of the traveling pressure device as it acts to flatten said tube, but will have been deprived of much of its natural resilientaction tending to forcibly restore the tube to its circular crosssection and consequently the suction of the pump will be greatly weakened. It will be evident also that, in a construction of this kind, the thicker the wall of the tube in proportion to its diameter, the greater the compressive tension of the wall on the inner side of the bend and, consequently, the greater the loss in the effective suction of the pump.

One object of my invention, therefore, is to provide a construction whereby,with an outer casing of relativelysmalldiameter, a relatively large size and thickness of tube may be used and yet the inner circular cross-section and the resilient action tending to restore such cross-section, after the flattening by the traveling pressure device, be normally maintained unimpaired. To this end, therefore, I provide the elastic tube by molding it originally in the bent shape to which it must normally conform when in the casing, and thus, however large and thick it may be, it is not distorted by being inserted within'said casing and will retain its maximum resilience when in such position.

vMy invention embodies also certain other features of improvement, as will fully appear from the following description taken in connection with the accompanying drawings, in which- Figure l is a sectional elevation of a pump embodying my invention. Fig. 2 is a similar view taken on line 2-2 of Fig. l. Fig. 8 isa partially' sectional View showing the traveling pressure device out of operative position. Fig. et is a perspective detail.

In the drawings A designates the cylindrical outer casing of the pump, B theelastic tube within ther same, and C the traveling pressure device for affording a moving pressure on the elastic tube. Said casing is com.- posed of sheet metal or other suitable material, and as an advantageous and convenient construction is herein shown as ma'de in two sections A' and A2 each comprising a fiat circular wall A3 A4 and a marginal cylindric Wall A5 A6; the cylindric wall A5 of the section A being sufficiently smaller in diameter than the cylindric Wall A6 of the section A2 to readily,"

though tightly, slip within the same, in the manner illustrated. The outer section A2 thus forms a cover for the inner section A',

and said outer section `is herein shown as provided with a rigidly attached and radially extending handle A7 by which the pump may be conveniently supported.

The `elastic tube B is located in the interior of the casing adjacent to the cylindric wall `thereof a'nd, to prevent the distortion which (as hereinbefore explained) results from bending 4a tube on a short radius, is originally molded in the curved shape to which it must conform when so placed within the casing. Thelmaximum resilience ofthe tube tending to restore it toits normally circular cross section after being flattened by the traveling pressure device is thus maintained `and I am thereby further enabled to form said tube B with a wall of great thickness relatively to its internal diameter (said wall being, in this instance, of a thickness greater than one-half of said diameter) and thus provide a powerful suction in the pump. Said tubev B, as lherein shown, extends completely around the interior of "the casing, but itsinlet and outlet ends B and B2 instead of lapping by each other and thus necessitating the use ofa casing having a width double the exterior diameterofthe tube, are turned outward in close proximity to each other and pass out of the casing through registering openings a and a in the cylindric walls A'and A6 of the casing sections A and A2 respectively. Obviously, however, said inlet and outlet ends might 'pass out of the casing through the side walls thereof, if so desired. l

As a convenient and advantageous construction that portion of the tube `within the casing is herein shown as molded in the form of a continuous ring with the inlet and outletends B and B2 leading ott radially from adjacent points on its outer side, a transverse partition BB being provided in the interior of thetube between the adjacent ends B and B2 in order to prevent any communication between them except through the full length of the ring. Said partition Ba is herein shown as arranged obliquely in aplane parallel with the axis of `rotation of the roller C in order thatit may offer as little obstruction as possible to the passage of said roller. The ends B and B2 are adapted to be connected by any suitable pipe couplings b b with the source of supply and discharge.

The revolving pressure device C is herein shown as comprising a roller C rotatively supported on a transverse pin c extending between the outer ends of radial` arms C2, the inner ends of which are mounted uponashaft D journaled in the sidewalls of the cylindric portion of the casing and at the centerthereof. A crank E and handle E furnish, inthis instance, a convenientmeans of rotatingsaid shaft and pressure roller. The attachment between the inner ends of the radial arms C2 and the shaft D is herein shown of such nature as to provide for the automatic radial adjustment of the roller C into operative position as the operator begins to turn the crank E and out of operative position as said crank is released. To this end the portion Dof the shaft D withinthe casing is formed eccentric to its end or journal `portionsD2andtheinner ends of the radial arms C2 are provided with an integral sleeve CB fitting said `eccentric portion `and adapted .to have a rotary movementthereon, said movement ,beinglimited by the engagement of `apin orstudolprojecting radially ,from one `endof `,the-eccentric portionD of the shaft D, `with the ends of a stop c fixed on the adjacent radialarm VC2. Said stop c is of such length andthe pin dis so located on the eccentric portion of `the shaft that when saidpin is inengagement with eitherlendof said stop-the roller 1C will be thrust out far enough toltlatten the elastic tube, as shown'in Fig. 1, while when said pin standsmidway between `the endsof 4the stop theroller willbebarely in contact with the tube and the latter will be freeto 4resume Aits normal circular cross -section. With such construction itwill be obvious that `the resilience of the rubber will ynormally maintain therollerinitsinnermostposition. Theturning of the crank E will, therefore, notimmediatelyrevolvethe pressureroller C `but will tirst rotate-the shaft D in the sleeve so as to force said roller against thetube until thellatter is pressed flat, after which the pin d will engage the end of the stop c and cause theradial armsand roller to rotate with the crank and thus operate the pump. Whengthecrank is released the resilience of the elastic tube will force the roller back into `the position shown in Fig. 3, the reaction of the sleeve on the eccentric portion of the shaftcausing the crank to tl y back far enough to permit such inward movement of the roller. Turning of `the crank in the other direction will, in an exactly similar manner, bring the 'pin into engagement with the other `end of the stop and force a constantfstreamof liuid through the tube-ina reverse direction.

As hereinfshownthe stop c is yprovidedgby setting the adjacent radial 4arm C2 slightly back from theendof the'sleeve and cutting away said end to the desired extent. The opposite end ofthe sleeve is also herein shown as formed in a similar manner with afstop c2 similar tothe stop c but of dierent length, and it Willbe obvious that by reversing the sleeve so as to bring the stop c2, instead of the stop c', into position for engagement with the pin d the roller C may be made to engage the tube B with a dierent degree of pressure.

Outwardly projecting sleeves a2 and a3 on the side, walls of the casing sections A and A2 respectively, afford a sufficient length of bearing for the journals Dg of the shaft and, as herein shown, the crank E is secured to the end Dsof the shaft adjacent to the sleeve d2; said end D3 being screw-threaded for engagement with said crank and being provided with a jam nut cl2 for securing said crank in position. In this instance a washer cl3 is shown as inserted between the crank and the sleeve a2. The other end D4 of the shaft is also shown screw-threaded and is provided with a nut d4, in this instance a thumb nut, normally engaging the outer face of the sleeve a3 and serving to bind the sections Al and A2 of the casing together. As herein shown the opening ctin the cylindric wall A6 of the section A2 is provided in the form of a recess open at one side so that said section may be withdrawn from the inner section A without interfering with the outlet and inlet ends B and B2.

From the foregoing construction it will be obvious that by removing the thumb nut d4, the inner section A and with it the entire operating mechanism and elastic tube of the pump may be Withdrawn from the section A2 and that therefore the said operative mechanism will be convenient of access for cleaning or for adjustment ofthe pressure device by the reversal of the sleeve Oaafter the manner hereinbefore described. I

The particular form of pump herein illustrated is more particularly intended as a surgeons pump for the transfusion of blood, but pumps similarly constructed and embodying the same principles may obviously be used for other and various pumping purposes.

I claim as my inventionl. .A pump comprising a cylindric casing, an elastic tube within the casing provided with inlet and outlet passages and a traveling pressure device for affording a movable pressure on the elastic tube, said tube being molded to conform to the curve of vthe cylindric wall of the casing, substantially as described.

2. A pump comprising a cylindric casing, an elastic tube extending around the interior of the casing and provided with inlet and outlet ends extending out of the casing in proximity to each other, and atraveling pressure device, revolubly mounted at the center of the casing for providing a movable pressure on the elastic tube, said tube being molded to conform to the curve of the cylindric wall of the casing, substantially as described.

3. An improved pump comprising a cylindric outer casing, an elastic tube extending around the interior of the casing adjacent to the cylindric Wall of the same, said tube being molded in a continuous ring with a transverse partition across its interior and with outlet and inlet passages molded in piece with the ring on opposite sides of the partition, and a traveling pressure device revolubly mounted at the center of the casing, substantially as described.

4. An improved pump comprising a cylindric outer casing, an elastic tube extending around the interior of the casing adjacent to the cylindric wall of the same, said tube being molded in a continuous ring with a transverse partition across its interior and with inlet and outlet passages molded in piece with the ring on opposite sides of the diaphragm, said diaphragm being inclined or oblique, and

a traveling pressure device revolubly mounted 8o at the center of the casing, substantially as' described.

5. A pump comprising a cylindric casingf an elastic tube withinthe casing, a shaft journaled at the center of the casing with its jouran elastictube within the casing, a shaft journaled at the center of the casing with its journal portions eccentric to but Within the cylinder of its middle portion, a projection at one end of said middle portion, a removable sleeve inclosing said middle portion and provided at its end With segmental stops of different lengths adapted to engage said projection, substantially as described.

7. An improved pump comprising a cylindric casing made of an outer and inner section each having a side Wall and a cylindric marginal Wall, the cylindric wall of the inner' section fitting within that of the outer section, an elastic tube Within the casing, a rotatable shaft journaled in the side Walls of the casing and having an eccentric portion, a reversible sleeve embracing said eccentric portion and provided at its opposite ends with stops of different lengths, a pin xed to the shaft for engaging either of said stops, a pressure member fixed to the sleeve and adapted to engage the elastic tube, the engagement of the shaft with the side wall of the outer section being detachable, whereby said section may be readily withdrawn to permit of 12o the reversal of the sleeve, substantially as described.

In testimony that I claim the foregoing as myinvention I affix my signature in presence of two witnesses.

CHARLES EDW'IN FUNK.

Witnesses:

C. CLARENCE POOLE, HENRY H. CARTER.

IIO

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