Патент USA US2404547код для вставки
l July 23, 1946. ' ' c. J. sTRlD 2,404,547 HYDRAULIC` PUMP Filed March v6', 1945 _ ÈÄ@ 7 d, STR/D 4 - 5f s@ Patented July 23, >1946 2,404,547 UNITED STATES PATENT OFFICE" HYDRAULIC PUMP Cari J. sind, La canada, Calif., as'signor tondi-,1 Precision Products Corp., a corporation of Cali fornia Application March 6, 1945, Serial No. 581,209 Y ` 8 Claims. l (c1. 10s-178) Z This invention relates to auxiliary hand pumps as used in hydraulic systems, particularly in air craft, for operating such systems in case of failure As shown in detail inthe accompanying draw ing, my invention is embodied in a pump which includes a cylinder 6 having an intake port l, a discharge port 8and a check valve 9 controlling the intake port in the usual manner. Sl-idable through a stuffing box I!! Within the cylinder is a piston rod II which is reciprocated of the main pump or when the latter is shut off. An object. of this invention is to provide a hand pump of the character described which has a novel and advantageous. piston-valve construction by means of which the number of parts is greatly by means of a lever I2 fulcrumed as at I3` on a reduced, the construction is appreciably simpli bracket I4 on the cylinder, there being a link I5 fied, the cost of manufacture reduced and the op connecting the lever with said rod. eration of assembling, disassembling and servic ingr the pump rendered extremely simple and sub ject to being readily and easily carried out. Another object of this invention is to provide a piston-valve arrangement in which a simple do nut type sealing ring or rubber, synthetic rubber ' Í As here shown a piston head I6 is formed in tegral with the rod II and has a Working nt in f the cylinder, although this head, as is obvious, could bel a separate part if desired. 15 or the like serves as a check valve as Well as an eñicient seal between the piston and cylinder wall. In accordance With my invention a sealing ring Il on the piston I5 made of synthetic rubber or the like, servesy as a valve, the piston being con structed and arranged to provide for limited movement of this ring relative to the piston head Yet another object is to provide a novel and 20 as well as to provide a fluid passagel through the eñicient piston-valve through the simple ex pediency of enlarging the sealing ring groove in head, which passage is controlled by the check valve action of the sealing ring responsive to re ciprocation of the piston assembly. Y This makes it unnecessary to use the customary separate the piston and forming ports through the piston head in an arrangement such that on one stroke, the sealing ring will move to a position opening 25 check valve assembly in the piston and eliminates the ports for passing ñuid through the piston and parts, Weight and production and upkeep costs on the other stroke will move to a posi'tion'closing compared to pumps as heretofore made. In carrying` out my invention the piston head f liì- is providedwith an enlarged sealing ring groove said ports to the flow of fluid' through the pis ton; this piston-sealing ring valve arrangement making it unnecessary to use the customary sep arate check valve assembly in the piston and re 30 I8 having ya width (extenty axial-ly of the piston head) considerably greater than the sectional width or diameter of the sealing ring I-'l which is preferably of circular cross. section. This makes ducing weight, number of parts and production costs compared to pumps of this class as hereto fore madey while also maintaining the desired seal between the piston and cylinder. ' With the foregoing objects in View, together it possible for the ring to act as a valve to con 35 trol the now of fluid through the piston head,` in with such other objects and advantages as may subsequently appear, the invention resides in the asmuch as the pressure of the fluid plus the fric tional resistance of the sealing ring against the cylinder wall causes the ring to shift bodily re sponsive to reciprocation of the head. parts and in the combination, construction and arrangement of parts hereinafter described and 40 The passage for íiuid through the piston- head claimed, and illustrated by Way of example in includes a plurality of diagonal ports IIS extend the accompanying drawing, in which: `ing from the outer end of the head into the Fig. 1 is a side elevation of a pump embodying groove I8 `so' that in- one position the sealing ring Il will close the ends of these ports Which ends Fig. 2 is an enlarged fragmentary longitudinal 45 open through the side wall `I8’ of the groove. sectional view of the pump showing the piston Fig. 3 shows how the ring Ill' is forcedk against and sealing ring valve action during one stroke of and closes the ports I9, being held> in such posi the piston assembly; tion by the pressure of the fluid as the piston as Fig. 3 is a View similar to Fig. 2 showing the sembly is moved in the direction of the arrow valve action on the other stroke of the piston as 50 shown in Fig. 3. The rest of the ñuid passage my invention; ‘ sembly; Fig. 4 is a fragmentary sectional View taken on the line 4_4 of Fig. 2; Fig. 5 is a fragmentary sectional view taken on the line 5_5 of Fig. 2. 55 through the piston head is provided for by means of radial ports 2B extending from the bottom of the groove 8 into an axial bore 2I in the center of the head and by a second set of radialy ports 22 leading from the bore 2| to the. periphery of 2,404,547 3 ' 4 having a fluid by-pass passage extending there through and an elastic sealing ring groove therein the piston rod H at a point adjacent the rear face of the piston head. With this arrangement intersecting and forming ra part of said passage, and a sealing ring mounted in said groove and positioned and dimensioned to have a constant sealing contact both with the head and Withsaid of the portsV i9, ring groove I8, radial ports 20, axial bore 2| and radial ports 22, a by-pass pas sage is provided in a most economical manner through the piston head, subject to control by cylinder, said ring and groove being dimensioned so that the ring wil1 shift into and out `of posi tions for opening andA closing> said passage upon the sealing ring l1 while the latter maintains a most eiîective sealibetween the piston and the wall of the cylinder 6. A suitable plug 24 closes reciprocation of said head while maintaining a seal between the piston head and the cylinder or rection of the arrow in Fig. 2, that is, toward ‘ bore wall associated with the head. 3. In a piston valve-sealing ring unit, a cyl the intake port 1, the check valve 9 prevents dis inder, a reciprocal piston head in said cylinder charge through said port and the pressure ofv the fluid against the ring l1 plus the frictional re 15 having a iiuid by-pass passage extending there through and a sealing ring groove therein inter sistance of the cylinder against said ring causes secting and forming a part of said passage, and the ring to shift to the left so as to abut and lie a sealing ring mounted in said groove and posi against the side wall 25 of the ring groove I8, tioned and dimensioned to'have a constant seal thereby providing an open by-pass passage through ports I9, ring groove , I8, radial ports 20, 20 ing contact both with the head and with said cylinder, said ring and groove being dimensioned bore 2l and ports 22 so that fluid will flow past so that the ring will shift into and out of p0 the piston while the ring l'! maintains an effec sitions for opening and closing said passage upon tive seal between the piston head and the cyl reciprocationof said head while maintaining a inder. ‘ seal between the piston head and the cylinder or As shown in Fig. 3, when the piston assembly ‘ bore Wall associated with the head, said ring being is moved in the direction of the arrow, that is, normally of substantially circular cross section. toward the discharge port 8, the pressure of the 4. In a piston-valve-sealing ring unit, a piston fluid against the ring ll Vcauses it to shift against head having a circumferential sealing ring groove the side Wall i8’ so yas to close the ports I9 and prevent iiow of'fluid through the by-pass pas 30 therein, ports extending from one end face of the head so as to open through one side wall of sage in the piston head. This causes the check said groove into the latter, said head having an valve 9 to open and fluid to be drawn into the cylinder through port 1 while fluid is discharged axial bore closed at its ends, ports extending from the bottom of the groove into said bore and through port 8. Rearward movement of the pis ton is limited by means of a stop shoulder 26 on 35 other ports extending from said bore s0 as to the outer end of theaxial bore 2|. ` , When the piston assembly is moved in the di complete a fluid by-passpassageway through said \ It is now apparent that in making the ring head, and a sealing ring in said groove, said groove of greater Width than usual and in forming groove and seal being dimensioned so that the a by-pass passage through the piston head in ring will shift in the groove into positions for :40 tersected by the groove so that the sealing ring opening and closing certain of said ports to open will shift into and out of positions for opening ` and close said «by-pass passageway through said and closing the passage, I have provided a most head upon reciprocation of said piston head. efficient combined valve and seal which makes 5. In a piston-valve-sealîng ring unit, avcylin it unnecessary to use the separate sealing ring der, a piston head in said cylinder having a cir and the separate check valve heretofore required. . cumferential sealing ring groove therein, ports the rear face of the piston head. This piston-valve-sealing ring-unit, while here.'y extending from one end face of the head s0 as shown in a pump, may, however, be used in any Vto open through one side wall of said groove into the latter, said head having an axial bore closed other device or mechanism where a piston or likey member is employed and it is desired to control theV flow of fluid through a passage therein in accordance with this invention. . While I have shown and described a specific embodiment of my invention, I do not limit‘my self to the exact details of construction set forth, at its ends, ports extending from the bottom of the groove into said bore ‘and other ports extend ing from said bore so as to complete a fluid by pass passageway through said head, and a seal mg ring in said groove for effecting a seal be tween the head and the wall of said cylinder, said and the invention embraces such changes, modi 55 groove and seal ybeing dimensioned so that the ñcations and equivalents of the parts and their f ring will shift in the groove into positions for formation and arrangement as come Within the opening and closing the first named ports where purview of the appended claims. rvI claim: 1. In a piston valve-sealing ring unit, a cyl inder, a reciprocal pistonl head in said cylinder having a ñuid by-pass passage extending there through and a sealing ring groove therein inter by said passageway Vis open and closed to pas- f 00 sage of ñuid therethrough upon reciprocation of the head. Y 6. In a pump, a cylinder having an intake port and a discharge port, a check valve controlling said intake port, a piston rod in said cylinder, secting and forming a part of said passage, and a for reciprocating said rod, a piston head sealing ring mounted in said groove and positioned 65 means on said rod reciprocable in said cylinder and hav and dimensioned to have a constant sealing con tact both with the head and with said cylinder, said ring and groove being dimensioned sovthat the ring will shift into and out of positions for opening and closing said passage upon recipro ing a sealing ring groove extending circumfer entially thereof, and a icy-pass passageway -which intersects said groove so that a part of the groove forms a part of the passageway, and a sealing cation of said head while maintaining a seal be tween the piston head and the cylinder or `bore ring mounted in said groove to shift axially of vthe head responsive to reciprocation of the head wall associated with the head. 2. In a piston valve-sealing ring unit, a cyl said passageway to the passage of fluid through inder, a reciprocal piston head in said, cylinder and to assume positions for opening and closing said head, said ring at alltimes beingv in‘sealing 9,404,254? S 6 éontact with said cylinderfand piston head to having a head provided with a circumferential prevent leakage therebetween. sealing ring groove therein and ports extending f _ t 7. In a pump, a cylinder having an intake port and a discharge port, a check valve controlling said intake port, a piston Vrod in said cylinder, means for reciprocating said rod, a piston head on said rod reciprocable in said cylinder and having a, sealing ring groove extending circum- l from one end face of the head so as to open through one -side wall of said groove into the 5 latter, said head having a bore passing axially therethrough and terminating in the rod portion of the piston, a plug closing the outer end of said bore, ports extending from the bottom of the ferentially thereof, a port extending from the groove into said bore and other ports extending outer end of the head and opening through one lÚ from said bore so as to complete a iiuid by-pass side wall of said groove, and a sealing ring mount ed in said groove so as to move axially of the passageway through said head, and a sealing ring in said groove for effecting a seal between the head into and out of position closing the first head and thewall of the cylinder surrounding named port responsive to reciprocation Vof said said head, saidgroove and seal being dimensionecl head, said head having a passage therein lead 15 so that the ring will shift in the groove into po ing from the bottom of said groove, through said sitions for opening and closing certain of said head and rod to a point on the exterior of the ports to open andclose said by-pass passageway rod rearwardly of said head. through said head upon reciprocation of said 8. In a piston-valve-sealing ring unit, a cylin piston head. ' t der, a piston reciprocable in said cylinder and CARL J. S'VI‘RID.