claim: A filter base for attachment to motor vehicle engines and adapted to selectively receive either one of first and second type filters, said first type comprising an outer shell containing a filter element -and a center 40 tube extemally threaded @at one end and said second type comprising a throwaway housing permanently enclosing a filter element and having a bottom plate with an internally @threaded collar, said filter base comprising a body having a filter Teceiving side, said side in45 cluding a chamber, @a passage in said body directly communicating wi@th said chamber, and an outlet tube centrally located in and extending out of said chamber, said side including a relatively wide flat annular face forming a radially extending sealing surface surtounding said 50 chamber :and protruding from said side and located at substantially a right angle to the axis of the outlet tube, said side including an @annular groove disposed radially inwardly from the outer periphery of said side and surrounding said annular face, said outlet tube being in-55 ternally threaded to receive the threaded end of the center tube of said first type filter @and said groove being located in ali.-nment with the end of the outer shell of said first type filter when -said center tube is threaded in said outlet tube whereby said shell end may be sealed 60 by a gasket in said groove, said outlet tube being externally threaded to receive the -threaded collar of said second type filter and said flat annular face being located in,alignmen-t with the bottom plate of said second 65 type filter when said collar is threaded on said outlet tube whereby said bottom plate may be sealed by -a gasket against said annular face. (References on following page)

3,259,247 3 4 References Cited by the Exaniiner 2,884,133 4/1959 Walulik --------- 210-136 X UNITED STATES PATENTS 2,897,966 8/1959 Humbert -------- 210-133 X 2,076,935 4/1937 Burckha lter ------ 210---442 X REUBEN FRIEDMAN, Primaty Examinei-. 2,430,713 11/1947 Eves et al - ------- 210-443 X 5 HERBERT L. MARTIN, Examiiier. 2,522,565 911950 Burhans ----------- 210--443 2,543,165 2/1951 Harlan ---------- 210-440 X F. W. MEDLEY, Assistant Examiner.

United States Patent Office 3@259,247 3,259,247 FILTER La Vern R. Tietz, Racine, Wis., assignor to Walker Manu. facturing Company, a corporation of Delaware Filed Jan. 15, 1963, Ser. No. 251,635 I Claim. (C]. 210-444) This invention relates to oil filter assemblies for internal combustion engines ;and, in particular, refers to the base on which the filter body and casing is mounted. Currently two different types of oil filter units are -in widespread use in the automotive field. One of these is the throwaw-ay uni-t in which the filter body is permanently enclosed in a casin.- and both iare thrown away when the Mter material loses its effectiveness. The other of these is the replaceable element type unit in which -the filter body can be removed from the casing and replaced with a fresh one when necessary. Throwaway units are usually installed as original equipment by the manufacturer iand their use is ordinarily continued by individual automobile owners. However, the maintenance cost for the replaceable element type unit is lower, since only the filter element is placed, and consequently it is preferred by ffeet owners, truck owners, the military service, iand others to whom maximum economy of operation is an impor-tant consideration. Both units are removably mounted on a fflter base which is secured to the engine. However, the two units ,are secured -and sealed in different ways when they are mounted and this demands cooperative structure on the base. Hence, two different base structures have been required for the two different oil filter units. With the foregoing background in mind, it is the object of the present invention to provide a single base structure that rnay be used as desired with either ty-pe of oil filter unit. 'To attain this important object, the base is provided with a centrally disposed hollow stud which is threaded on the inside to enga-e the threaded end of the stand pipe of the replaceable element type unit. The stud is threaded on the outside to en.-age a threaded part of the bottom plate of the throwaway type filter. Also, the base is provided with a groove to receive a gasket to seal the end of the outer shell of the replaceable element type unit and with an extended sealing surface to engage a sealing gasket carried by the throwaway type filter unit to seal the end of the outer shefl thereof. Thus, the base of the device is designedto accept either type of filter with equal facility. Further objects of this invention are to provide a device of this type which is efficient, durable, com@pact, and of simple construetion, comprising ia minimum number of parts whereby it may be economicary manufactured and easily assembled. The various objects and advantages, and the novel details of construction of one commercially practical embc)diment of the invention, will become more apparent ,as this descrip@tion proceeds, especially when considered in connection with the accompanying drawings in which: FIGURE I is a longitudinal sectional elevational view of a filter showing @a base constructed in,accordance with this invention, with -a replaceable element type Mter unit ,attached thereto; FIG. 2 is a similar view showing a disposable or throwaway type filter unit at,.tached to the base; and FIG. 3 is ;a sectional view taken substantially on the plane indicated by line 3-3 of FIG. 2, on a smaller ccale. Patented July 5, 1966 2 is in Referring to the drawings, the base casting 10 ' ' general of a known type and has -a face 11 adapted to be bolted to an engine (not shown). T-he face has a recess 12 which is lan inlet chamber for oil to be filtered, such oil flowing through a passage (not shown) in the base to its opening 13 in recess or cham@ber 14 on the bottom of the base from whence it flows into the filter unit. Oil that has been filtered leaves the base through the passage 15. 1-f the filter becomes 10 CIO,-ged, the pressure in chamber 14 will increase to the point where relief valve 16 is unseated to permit oil to by-pass the fflter unit and flow through passage 17 in the base into the outlet passage 15. ' In accordance with the invention a hollow stud 21, 15 having a locking groove 23, is integral with the base 10, being cast therein during manufacture of the base. The end of the stud is threaded on both the inside and the outside whereby either of the two types of filter units can be secured to the base. 20 In further accord with the invention, the bottom face 31 of the base 10 is provided with a flat annular surface 33 and @an annular groove 35 whereby either of the two types of filter units may be sealed to the base. . In FIG. 1, a replaceable element type of M-ter unit 41 25 is secured to the base 10. In this case the stand pipe 43 is threaded inside the stud 2]L so that the outer top edge 45 of the casing 47 can compress the gasket 49 tightly in groove 35. Gasket 50 provides a seal between the ffiter center tube and the end of stud 21. 30 In FIG. 2, a throwaway fiiter unit 51 is'secured t6 the base 10. In this case the collar 53 on the base plate 55 of the unit 51 is -threaded on the outside of stud 21 so that the gasket 57 is compressed against the flat surface 33. 35 1