US 2430427 A
Abstract available in
Claims available in
Description (OCR text may contain errors)
Nov. 4, 1947. I I M. KATCHER CHECK VALVE Filed Nov. 10, 1945 ATTORN EY Patented Nov. 4, 1947 UNITED I1 ICE iEHECK "MorrisiKatcher,NewiiorhflJX. Application November 10, l 943gfserialfNo$fill9$i5 This invention relates to a check valve, especially one which is suitable for use in a fuel pump for internal combustion engines. In pumps of this type, it has been a practice to use valves which can be pushed in with a forced fit into the passages of the pump. The principal part of valves of this type is made of a sheet metal stamping of a rather complicated form. The assembling of the parts of the valve also offers difficulties. Valves of this type can be seen at 41 and 49 in Fig. 1 of Patent No. 2,036,452. It is an object of the present invention to construct a valve in which the two principal parts are formed from simple sheet metal stampings, namely, a trough-shaped ring and a cage which can be given a forced fit in the ring. The outside surface of the ring is substantially cylindrical, so that it can be readily given a forced fit in the circular passages of a fuel pump.
Other objects and advantages will become ap-' parent upon further study of the description and drawing, in which:
Fig. 1 is a substantially median vertical section through a fuel pump showing two of my valves set therein;
Fig. 2 is a plan view of the inlet side of the valve with a portion broken away to show the side of the plate beneath;
Fig. 3 is a section taken along the line 3-3 of Fig. 2;
Fig. 4 is a plan view of the outlet side of the valve, and
Fig. 5 is a section taken similarly to Fig. 3 of a modified form of the valve.
Near the end of inlet nipple B of the fuel pump is set one of my valves, valve 1, with a forced fit therein, the ring 8 of the valve being pushed against shoulder 9. Inlet nipple 6 leads to a chamber H! in which is mounted diaphragm |l. Outlet nipple |2 leads the fuel from chamber H]. In outlet nipple I2 is set another of my valves, valve l3, which has a mounting similar to that of valve 1. Valve 1 permits the fuel to enter chamber I but not to pass out to the left therefrom. Valve |3 permits the fuel to leave chamber ID and to enter nipple l2 but not to return. Diaphragm II is held between washers M which are attached to the upper end of rod Ill. The lower end of rod l has a slot IS in which one end of crank l1 plays. Crank I1 is fixed at its other end to rock shaft l8, said shaft being rocked by mechanism not shown but which is well known to the art wherein fuel pumps are used. The reciprocation of crank causes rod l5 to flex diaphragm H up and down effecting the intake of fuel through valve I and its discharge through valve I3.
Valve 1 consists of a ring or crown 8 of relatively heavy gauge metal. Ring 8 is substantially trough-shaped in cross section. A retainer cage IQ of relatively lighter gauge metal has a cylindrical upper portion 20 which is given a forced fit with the inside of the outer rim'2l of ring 8, Fig. 3. The inside surface of rim 2| is substantially cylindrical. Arms 26 extend upward from a substantially flat base 22 to join the latter with the cylindrical upper portion 20. A spring 23 is set upon base 22 and at its upper end presses or seats a polygonal plate 25 against the bottom edge of inner rim 24 of ring 8. Parts 8, l9 and 25 are readily stamped from sheet metal and easily assembled with spring 23. In its broader sense base 22 is merely a transversely extending portion of cage l9 not necessarily fiat or imperforate.
In Fig. 5 is shown a valve of modified construction. It comprises a relatively heavy gauge ring 3| of sheet metal of trough-shaped cross section, the trough being of V-form, the outer rim 2! of which instead of having a cylindrical inner surface as with ring 8 of Fig. 3, has a substantially truncated conical one. Cage 28 has a flat base 29 as before, with arms 30 extending upward therefrom. The inner rim 32 of ring 3| has its outer surface also of substantially truncated conical form but with a flatter conical angle. Upper portion 33 of cage 28 before it was forced into ring 3| was inscribable in a cylinder as shown for the upper cylindrical portion 20 of Fig. 3. As cage 28 is forced into ring 3|, the top of portion 33 first strikes the upper part of the outer surface of inner rim 32 and then is spread outward to engage the inner surface of outer rim 21. Spring 23 and plate 25 are similar in construction and function to those shown in Figs. 3 and 4.
In operation, liquid entering the valve passes inward through rings 8 or 3| and pushes down plate 25 away from the ring against the pressure of spring 23. Once this is done the liquid passes by the edge of plate 25 and through the spaces between the arms of cages IE! or 2B. When fluid enters the valve in the reverse direction, plate 25 is pushed against ring 8 in the valve of Fig. 3 and against ring 3| in the valve of Fig. 5, in both cases blocking the flow of fluid through the valve.
A check valve comprising a ring, trough-shaped in cross section, said trough being substantially V-shaped providing an inner and an outer rim extending axially of said ring, a cage having a substantially transversely extending base and a portion extending generally axially from the base to the ring, said rims extending with their free edges toward the base, the inside surface of the outer rim being in the form of a truncated cone with its largest diameter away from the free edge of said latter rim, the outside surface of the inner rim also being in the form of a truncated cone but at a greater inclination with the axis of the ring than said inside surface, said cage portion extending into the ring with a tight fit with the entire inside surface of the outer rim of the ring, a transversely extending member movable within the cage to seat against the free edge of the inner rim of the ring, and a spring between the member and said base, normal holding the member in seated position against 7 said inner rim.
4 REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 1,251,758 Dayton Jan. 1, 1918 2,027,137 Yeomans Jan. 7, 1936 1,998,444 Clapp Apr. 23, 1935 1,654,474 Wolter Dec. 27, 1927 1,872,928 Giiford Aug. 23, 1932 2,320,697 Binder June 1, 1943 484,843 Bavier Oct. 25, 1892 517,914 Bavier Apr. 10, 1894 2,241,758 Baldine May 13, 1941 1,413,371 Adler Apr. 18, 1922 FOREIGN PATENTS Number Country Date 341,761 Italy I935