US1558173A - Membrane for manometers - Google Patents

Description

Oct. 20,1925- 1.558,173

P. JATOW IEIBRANE ion unonsrsns Filed March 20. 1925 Patented Oct. 20, 1925.

UNITED STATES PATENT OFFICE.

PAUL J'ATOW, 0 F DODENDORF, NEAR MAG-DEBURG, GERMANY, A'SSIGNOR TO SCHKFFER & BUDENBERG, G. M. B. 1-1., OF BUCKAU', NEAR MAGDEBURG, GERIVIANY.

MEMBRANE FOR MANOMETERS.

Application filed March 20, 1925. Serial No. 17,140.

To all whom it may concern:

Be it known that I, PAUL JATOW, a subject of the German Republic, residing at Dodendorf, near Magdeburg, Germany, have invented certain new and useful Improvements in Membranes for Manometers, of which the following is a specification.

The plate and membrane springs of manometers and also of aneroid barometers, which it is desired to protect against overloading or stress when at work, must be faultlessly applied to the plant or casing wall under the maximum possible load or stress. As however, for the purpose of bettcr resiliency or springiness, the membrane must be provided with concentric ribs (see Figure 1) thus upon an overloading of the plate spring only the annular collars a, 6, etc., come into contact with the corresponding points a 6 etc., on the casing, so that an increased pressure can still always deform the spring.

Now according to the present invention, by means of a special formation of the corrugation cross sections of the membrane spring, alterations in the elasticity of the membrane spring are to be entirely avoided, so that the alterations in pressure in such measuring instruments can be indicated for a much longer period of time and with greater accuracy than heretofore.

In the accompanying drawings Figure l is the known constructional form in cross section;

Figure 2 is a cross section of the membrane or diaphragm spring according to the invention; and

Figure 3 is the same in plan.

The annular collars a, b of the type so far known, which however bear against the 40 points 6 6 (see Figure l) are, according to the present invention, only pressed in one side upon the side turned towards the inflowing pressure medium. The back of the membrane or diaphragm, which in the case of excessive pressure, bears upon the casing wall turned off at the top, forms a flat surface which is only interrupted by the narrow annular grooves.

A deformation of the spring by excessive pressure is not possible in the case of the new construction, because the points c-d, ef, etc, (Figure 2) running in a straight line bear upon any excess of pressure upon a corresponding straight surface 0 d e f of the flat casing wall. Upon the ring-shaped collars the pressure can only act in a radial direction, just as upon a cylinder jacket, and hence no deformative moments of fleXure occur.

lVhat I claim and desire to secure by Letters Patent of the United States is:

In a measuring instrument, a chamber having a pressure medium inlet, a resilient diaphragm arranged in said chamber and having substantially flat annular surfaces alternating with annular corrugations directed toward the inlet side of said chamher, and a substantially flat supporting surface on one wall of said chamber, against which the flat annular surfaces of the diaphragm immediately abut when the normal maximum pressure is exceeded.

PAUL J ATOW

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