US1694770A - Oil-pump screen - Google Patents

Description

Dec. 11, 1928.

L. V. CRAM OIL PUMP SCREEN Filed Oct. 5, 1927 "anni Patented Dec. 11, 1928.

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LEROY v. CRAM, orHrLiN'r, MrcHiGAN, AssIGNon To ennuient Morrone coni-orali- Tron, or nn'rnorr, MICHIGAN, A ccnrcnnrron,ornntnwnnn OIL-PUMP SCREEN.

Application filed October 5, 1927. Serial No. 224,180.

My invention relates to lubricating` systems for internal combustionand other engines of the type wherein oil is withdrawn from the crankcase ofthe engine by a suitable pump, and forced by the pump to various parts to be lubricated, 'or to various places where a supply of oil has to be maintained; an example of such a system, and a system wherein my invention is made use of, being disclosed in the application for patent liled by Charles W. McKinleyand myself upon May 19, 1927, Serial Number 192,712. My invention relates particularly to a strainer or filter designedk for use in lubricating systems of the type just mentioned; the purpose vthereof being to prevent, so far as possible, the entrancek of impurities into the oil pump and their presence in the stream of oil forced thereby to the various parts to be lubricated.

he drawing accompanying and forming apart of this specification illustrates the preferred form of my inventionralthough the same may be embodied in other forms, `and l regard my invention asembracing and including all such other forms as come within the scope of theconcludingclaims, wherein the particular `features in which my invention consists are particularly pointed out and claimed,

In the drawing:

Figure 1 is a view showing my invention as applied to the suction pipe of an oil pump of an engine lubricating system. l

Figure 2 is a fragmentary view showing a detail of my invention. y u p Figure 3 is a view' showing ablank cut from coarse and comparatively heavy woven wire screen material, and which when properly shapedprovides a prctectingshield yelement of my improved strainer.

Figure lis a view showing a protecting shield formed from the blank shown in ,Figure 3, the view showing the shield in end elevation. y

Figure 5 is a perspective view illustrating the features shown in plan in Figure 2.v

Figure 6 is a view showing a section upon a transverse plane indicated by the line 6, 6, VFigure 1, looking up. z

Figure 7 is afragmentary view showing a sectionupon a plane perpendicular to the sheet of the drawing and indicated by the line 7 7, Figure 1, and upon a larger scale than Figure 1.

ReferrinfY to the drawingr the reference numeral 9 designates, '.onventionally, the cylinder block of an internal combustion or other engine; 10 the oil pan to which oil returns by gravity from the various parts lubricated, and which normally contains a considerable quantity or' oil; 11 an oil pump, one of the rotary variety, for example. as in the application for patent hereinbefore mentioned; 12 the suction pipe through which oil from the cranli case enters the pump; and 18 the discharge pipe leading from the pump to the various parts and places to be supplied with oil.

- The reference numeral 1e designates a disc-shaped screen supportingmember which is made from sheet metal and which, while shown as slightly conical in form, does not differ materiall from a flat and commonly circular disc. rlhe `middle part of this supporting member is slit-ted by a suitable tool to provide a plurality of triangular lugs 15, which are bent out at right angles to the plane of the member 1.1i-, and extend laterally therefrom, said lugs being spaced around a central opening in the screen support. A guide tube 16- is arranged in the opening,'and the lugs are fastened to the tube. as by welding, soldering or otherwise; the tube when assembled with the member 111 extending at rightangles thereto. rlhis tube will be slightly greater in diameter than `the suction pipe'12v of the pump with which my device is to be used; so that the tube forms a guide for. the strainer as a whole and maintains it in substantially the relation to the suction tube illustrated in Figure 1.

'The strainer as a whole is held down against the bottom wall of the oil pan 10 by a. spring 17 which surrounds the guide tube 16 and the suction pipe 12 with which the tube is concentric. y

The numeral 1 designates a filtering screen the mesh of which is sufliciently line to prevent impurities of any a aprecia] le size from passing therethrough and to the pump. It is made from a circular blank, not shown, which is givena substantially semisphcrical form by the Vuse kof vsiuitable dies; and the yfree edge about the open upper end of the formed screen is fastened to the screen support 14 along the periphery thereof.` Pref'- erably this fastening is accomplished by forming an outward extending flange at the upper end of the screen as it is shaped from the blank, and turning the periphery of the screen support inward and onto the flange by the use of suitable dies, to thereby form a seam between the parts of substantially the form shown in Figures 1 and 7. rI`he upper end of the semispherical screen may, however, be secured to the periphery of the screen support 14 by soldering, or in any other suitable way.

The fine mesh screen 18 is made from such light screen stock or wire cloth that it is likely, if not protected, to be injured in handling the strainer, or during the manufacture thereof, and again even the slight pressure of the spring 17 might collapse the screen as it holds it against the bottom wall of the oil pan. Therefore and in order to guard against the above mentioned and other injuries I provide an external protecting shield for the screen, the same being much more resistant to forces tending to crush or otherwise injure the screen than the screen itself.

In the preferred form of my invention illustrated the protecting shield is designated by the numeral 19; the same being in the form of a coarse mesh and comparatively heavy wire screen which overlies the more delicate screen 18 and prevents injury thereto. This shield is made from a blank cut from screen stock of the proper mesh and size of wire, the blank being of approximately the shape shown in Figure 3. The blank is then given a form such that it will fit quite closely over the screen 18, as by the use of suitable forming dies, t-he shield in its finished form being shown in end elevation in Figure 4. Preferably the shield overlies the middle part only of the screen 18, as the protection thus afforded is quite sufficient, and a shield of the form shown may be much more easily formed from the heavy screen material or wire cloth from which it is made than a shield truly semispherical in form, like the screen which it overlies and protects. The ends of the shield 19 are fastened to the screen supporting member 14 at opposite pointsin the periphery thereof as by Hanging the ends and enclosing ianges in the seam formed by bending the periphery of the member 14 inward and onto the flange of the screen 18, as best shown in Figure 7 of the drawing; although the ends of the shield may be fastened to the screen support by soldering, or in any other suitable manner.

In View of the premises it will be appreciated that the fine mesh and comparatively frail screen 18 is protected by a much stronger shield 19 which overlies the same, thereby preventing injury to the screen during the manufacture and handling thereof,

and thereafter when it is in use in the manner contemplated.

I-Iaving thus described and explained my invention, I claim and desire to secure by Letters Patent:

1. A strainer comprising a disc-shaped screen support having a tubular guide eX- tending therefrom, a fine mesh filtering screen semispherical in form, and the free edge of which is secured to said support along the periphery thereof; and a perforated protecting shield arranged outside said screen and secured to the periphery of said disc-shaped screen support.

2. A strainer comprising a disc-shaped screen support, a fine mesh filtering screen semispherical in form, and the free edge of which is secured to said support along the periphery thereof; and a protecting shield made from coarse mesh screen material arranged outside said fine mesh screen and secured to the periphery of said disc-shaped screen support.

8. A strainer comprising a disc-shaped screen support the periphery of which is turned inward and made to overlie the outer part of its body portion, a fine mesh filtering screen semispherical in form and the free edge of which is turned outward, and is held between the inturned periphery and the body portion of said screen support; and a protecting shield made from coarse mesh screen material arranged outside of and overlying the middle part of`said filtering screen, and the ends of which are also held between the inturned periphery and the body portion of said screen support.

4. A strainer comprising a disc-shaped screen support having a tubular guide eX- tending therefrom, a fine mesh filtering screen semispherical in form, and the free edge of which is secured to said support along the periphery thereof; and a protecting shield made from coarse mesh screen material arranged outside of and overlying a part only of the surface of said filtering screen, and the ends of which shield are secured to the periphery of said screen support at opposite parts thereof.

5. In a strainer of the class described, a disc-shaped screen support made from sheet metal and having a plurality of triangular lugs cut free and bent so as to extend laterally therefrom, and which lugs are disposed about an opening in said support; and a tubular guide arranged in said opening and secured to said triangular lugs and eX- tending at right angles to said screen support.

In testimony whereof I affix my signature.

LEROY V. CRAM.

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