US1884042A - Indicator - Google Patents

Description

E. E. MARLIN Oct. 25, 1932.

INDICATOR filed Dec. 20, 1926 ATTORNEY Patented Oct. 25, 1932 EL'MER E. MARLIN, OF DETROIT, MICHIGAN rumoa'ron Application filed December 20, 1926. Serial No. 156,050.

This invention relates to an indicator and more particularly to an indicator for determining a free passage through a conduit.

In the manufacture of concealed passages such as in radiators, pipe lines or manifolds for internal combustion engines, any obstruction therein has been difficult to detect until the passage is in use. These obstructions are more often found in castings, varying insize,

"" often large enough to entirely obstruct the passage. If the obstruction is not discovered before the device is put into operation considerable di'fliculty may result.

It is therefore an important object of this invention to provide a means for determining whether or not there is a free passage through the conduit, illustrated by a device for forcing a current of air through the passage and 1ndicating any back pressure on that current of 1:0 all.

Another object of the invention is to provide an adjustment for the device whereby the pressure, at the point of the back pressure ndicator, may be varied depending on the slze of the concealed passage.

A further object is to provide means for indicating the size of the obstruction which has been shown as a graduated opening adapted to relieve the back pressure caused by the 311:: obstruction.

These and other objects of the invention will more fully appear from the following description taken in connection with the accompanying drawing, in which:

Fig. 1 is a side elevation of the device, parts being in section, applied to a hot air passage around an intake manifold.

Fig. 2 is a sectional view through the de- .vice for indicating the size of an obstruction,

4o taken on line 2-2 of Fig. 1.

Fig. 3 is a sectional view on l1ne 33 of Fig. 1 showing the method of securing and sealing the device in a passage to be tested.

Referring to the illustrated embodiment of my invention, an intake manifold 10, for use on an internal combustion engine, has been 4 shown having a passage 12 surounding the manifold constituting a bypass from an exhaust manifold 14. The exhaust gases enter the manifold 14 through openings 16 and are exhausted through an opening 18. A portion of the exhaust gases, however, pass through an opening 20 into the passage 12 around the manifold, returning to the exhaust manifold through opening 22and passage 24.

The purpose of-the passage around the intake manifold is to heat the latter to cause better vaporization of the fuel and when this passage is restricted its efliciency is reduced.

The device for testing the flow of air through the passage has been illustrated as comprising a conduit adapted for communication with the passage, means for supplying a predetermined air pressure therethru and means for indicating any resistance or back pressure on that air pressure. Referring more specifically to the illustrated device, a conduit 26 has one end provided with a connection 28 having a passage 30. The lower end of the connection is provided with a cylindrical portion 32 adapted to fit an opening 34 in the manifold, the lower end of said cylindrical portion being closed. An opening 36 is formed on the side of the cylindrical portion 32, adapted to register with 75 the passage 24 and communicate with the passage 30. A collar 38 and gasket 40 position the cylindrical portion in the-opening 34. The upper end of the connection 28 is provided with a cap 42 which receives a screw threaded rod 44 having a handle 46 at one end thereof and a tapered end portion 48 at, the other end. Slidably mounted in the wall of the cylindrical portion 32 is a member 50 having a tapered opening 52 slightly larger than the tapered end portion 48 .of the rod 44. When the opening 86 isaligned with the passage 24 the rod 44 is screwed down with the tapered end 48 engaging one side of the tapered opening 52, forcing the member 50 firmly against the side of the opening 34, thus securing the device in position. To insure a proper seal, packing 54 has been provided between the cylindricalportion 32 and periphery of the opening to the passage The conduit 26 isprovided with a passage 56 and has an adjustable tube 58 screwthreaded therein which is connected to an air pressure supply regulated by a suitable valve 60. we

Adjacent the inner end of the adjustable tube 58 and located in the conduit 26 at an acute angle to the direction of air fio-w, is a fitting 62 having a passage 64 Communicating with the passage 56 and open to atmospheric pressure; Within the passage 64- is a one way valve, shown as a ball 66 fitting a seat 68.

When a pressure is applied througl i the tube 58, passages 56 and 30, opening 36 and passages 24, 22, 12 and 20, the ball 66 rests on its seat 68 when there is: a free passage of air through the said passages but in the event of an obstruction a back pressure is formed and the ball 66 is forced away from its seat visible through a slot 70 in the fitting 62. Thus when the passage to be tested is free, there is nomovement of the ball andwhen it is obstructed the ball 66 flutters indicating the obstruction. I

The back' pressure or effective pressure on the ball 66, may be varied by thelocation of the end of-the tube 58. The smaller area, when communicating with the larger area, acts as a ven-turi and by positioningthe end ofthe tube with respect to the passage64, varying pressures may be obtained adjustable to the size of a given passage to be tested. A look nut 72 retains the tube in adjusted position.

As shown in Fig. 2, a means has been provided for determining the size of the ob-. struction. An adjustable valve 75, shown asa screw threaded tapered. member 74, adapted to engage a corresponding tapered seat, forms a relief for the back pressure caused by the obstruction. When this valve has been opened sufiiciently to overcome the back pressure, the ball 66, or indicator stops fluttering and the relation of the opening through the valve is proportionate to the of the obstruction, Thus by graduating the valve, illustrated by a graduated member 7 6 adjacent an indicator 7 8 forming the handle of the valve, a reading may be taken thereby determining the size of the obstruction.

While I have described what I deem to be the preferred embodiment of my invention it is to be understood that various changes may be made without. departing from the spirit thereof and it is not my intention t-olimit' its scope other than by the terms of the appended claims.

What I claim is: [I

1. Ina device of the class described comprising, a conduit adapted for communication with an open passage, means for supplying a current of air through said conduit and passage, means for indicating aback pressure caused restricting theflow of said air current, and means for varying the amount of pressure adjacent said indicating means.

2. In a'device of the class described comprising, a conduit adapted for communicating Withfi passage, means for supplying a current of air through said conduit and passage, means for indicating a back caused by restricting the flow of said air pressure current, and graduated means for relieving formed through said conduit and passage, an

axially adjustable conduit within said first mentioned conduit, means forconducting a current of air through said conduits and passage, and means for indicating any back pressure caused by-restricting said air current.

In a device of the class described comprising, a conduit having one end provided with an opening and means for securing it to a member provided with a passage whereby a continuous passage is formed through said conduit and passage, an axially acliustablc conduit within said first mentioned couduit, means for conducting a current of air through said conduits and passage, means for indicating any back pressure caused by restricting said air current, and graduated means for relieving said back pressure.

5. In a device of the class describedcomprising, a conduit, means for securing said conduit in communication with an open passage, meansfor supplying a current of air through saidconduit and passage, a passage for the escape of air from said conduit communicating with the air current in said condnit.v and a member in said passage movable by any back pres we in the current of air.

6. In a connccwon of the class described comprising a tubular member having a closed end portion and an opening in its wall adapted to be received in an opening formed in a member provided with a passage, a slidable member projecting through the wall of said tubular member opposite said first named opening, packing around the periphery of said 013811111 nd nice. 2; for forcing said slid c7 5 able member outwardly against the wall of tubular member said member to retain said position.

7. In a device of the class described com prising, a conduit, means for securing said conduit in communication with a passage. a conduit screw? threaded within said first named conduit, a valve for regulating a current of air through said conduits and pas sage, a fitting provided with an. opening communica-ting with said air current and open to atmospheric pressure, a member in said fitting adapted to close said opening and adapted formovement by a pressure greater than atmospheric pressures within said conduits, and a graduated valve for relieving the pressure causing movement of said member. V

ELMER MARLIN.

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