~ ‘Oct. 15, 1946. ‘ > I c. ‘VQGRE’ENLEAF 4 2,409,430 FLOW INDICATOR FOR PIPE LINES ' Filed may 1, '1944 12 Sheets-Sheet 1 ~ A Item qs' Oct. '15,- 1946. v c.- v.' GREENLEAF FLOW ‘INDICATOR FOR PIPE LINES » 2,409,430 Filed May 1, 1944 , @2 Sheets-Sheét 2 ,,4' .i / . ///////// / / / / /////I//‘///_//// / / ./ // / / .// / / / :////" / 2,409,430 Patented _Oct. 15, 1946 UNITED STATES ‘ PATENT OFFICE‘ 2,409,430 FLOW INDICATOR FOR PIPE LINES Carroll v. Greenleaf, Edmonds, Wash. Application‘May 1, 1944, Serial No. 533,628 1 Claim. 1 (01. 138-76) 2 The described ?ow indicator is designed to be interposed in a pipe line, particularly an oil dis charge pipe line of a tanker, or the like, by bolt ing the same through the bosses 4 and bolt holes 5 simply constructed, inexpensive, ef?cientdevice to the end ?anges of the usual pipe line sections, to be interposed in an oil pipe line and which is not shown. When thus installed, the stream of adapted to render the stream ?owing through oil pumped through such a discharge line is the line clearly visible and is equipped with means clearly visible through the pipe section I so that for indicating positively whether or not the oil is it is possible to see the color of the product being ?owing. ‘ Other, and subordinate, objects are also com 10 pumped, particularly in the case of different gas olines, and prevent mixtures occurring in unload prehended by my invention, all of which, together ing oil, or gasoline. Also, whether or not the pipe with the precise nature of my improvements, will line is full, or only partially so, or empty, may be readily understood when the succeeding de be readily ascertained. The ?ow indicator mem scription and claims are read with reference to the drawings accompanying and forming part 15 ber 8, under the ?ow of oil, or gasoline, through the pipe section I will be swung in the direction of this speci?cation. of the flow to positively indicate that the contents In said drawings: of the pipe line are ?owing therethrough, and in Figure 1 is a view in side elevation of my inven the event that such is not the case, said member tion in its preferred embodiment, will assume a perpendicular position and thereby Figure 2 is a view in end elevation, indicate that the contents of the pipe line are Figure 3 is a View in longitudinal vertical sec My invention relates to improvements in flow indicators for oil pipe lines, more particularly, the principal object in view being ‘to provide a tion, not being pumped therethrough. When gasoline in a common plane with the ?ange and are pro the inventive concept, and right is herein ,reserved is being pumped through a pipe line equipped Figure 4 is a view in transverse section taken with my improved ?ow indicator, the accumula on the line 4—4 of Figure 1, Figure 5 is a fragmentary view in perspective 25 tion of static electricity in the indicator is ob viated, since the rings 3 connected by the bars 6 of the bonding devices. are bonded to the pipe sections, not shown, be Referring to the drawings by numerals, my tween which the ?ow indicator is interposed improved flow indicator comprises a pipe section through the before-mentioned bolts which are I of any suitable length and diameter and which is provided with a pair of circumferential, radial 30 bonded with the bosses 4, as will be clear. The foregoing will, it is believed, su?ice to im external end ?anges 2. The pipe section I is part a clear understanding of my invention with formed of a suitable transparent plastic which out further explanation. is a non-conductor of electricity. Manifestly,'the invention, as described, is sus A pair of ?at rings 3 are embedded in the ceptible of modi?cation without departing from ?anges 2 and the body of the pipe section I each to such modi?cations as fall within the scope of vided with a plurality of circumferentially and the appended claims. equidistantly spaced tubular bosses 4 on one side What I claim is: thereof extending through the flanges and termi A device of the class described to be inter nating flush with the inner faces of said ?anges. 40 posed between sections of a pipe line comprising On the other sides of said rings 3, the ?anges a pipe section of transparent insulating plastic are provided with bolt holes 5 aligned with the provided with circumferential end ?anges having bosses 4. bolt holes therein for bolting in the line, and A plurality of flat bars 6 of metal suitable for conducting electricity extend longitudinally of the 45 means embedded in said section for obviating the accumulation of static electricity in the section body of the pipe section I and are connected at and constructed and arranged for bonding with their ends to the rings 3, said bars being grouped said line through said bolts comprising a pair of around the section I in equidistantly spaced rela conductor rings embedded in said ?anges and tion and embedded in the body of said section and longitudinal external ribs ‘I extending be 50 provided with tubular bosses aligned with said bolt holes and adapted for the extension of said tween the ?anges 2. bolts therethrough, and longitudinal conductor In what constitutes the top of the pipe section I, bars embedded in said section and connecting and in the transverse center thereof, an arrow said rings. like ?ow indicator member 8 is suspended by a CARROLL V. GREENLEAF. staple-like hanger 9 embedded in the body of the 55 pipe section I, said member 8 being swingably mounted on the hanger 9 for movement longitu dinally of said pipe section.