JPS59198335A - Integral front type pressure gage case - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] TECHNICAL FIELD This invention relates to techniques for measuring and testing fluid pressure gauges.

Instruments, particularly pressure gauges, are widely used and commercially available from a variety of manufacturers. Pressure gauges have very wide commercial and industrial applications and therefore belong to mass-produced items produced by numerous manufacturers.

In the sales competition, it is important to lower prices, so each manufacturer will consider any savings in labor or materials, no matter how small, that will help lower the price of the final product. Great efforts have been made to reduce costs by incorporating

A common form of case construction for pressure gauges is the "one-piece front", where an intermediate wall separates the case into front and rear compartments. In a typical arrangement, the front compartment contains the indicating mechanism, whereas the pressure sensitive element is contained in the rear compartment.

Therefore, if the element were to break due to excessive pressure or other reasons, protection would be provided to the rear of the case rather than the front. The structure of the integral front type pressure gauge case mainly complies with ANSI standard B40.1-19'7.
Governed by Section 4.3.1.1.2.

The structure of a conventional typical integral front type pressure gauge case disclosed in patent documents is 2, for example, U.S. Patent No. 4.154.1.
As disclosed in No. 66 and No. 4.17'5.444, an integral front wall is made separately and then combined with a peripheral case wall of another structure. Others are cast integrally with two peripheral walls, such as those disclosed in U.S. Pat. No. 2,215,013 and U.S. Pat. No. 2,752,787. Nevertheless, while it has long been known that monolithic facade structures of the type described above are relatively expensive to manufacture, there is no known way to significantly reduce that cost.

TECHNICAL FIELD This invention relates to pressure gauges and, more particularly, to a novel one-piece front case construction that is less expensive to assemble than conventional similar type case constructions. This is accomplished by making the case with cutouts stamped out of a metal sheet. After the stamping is made, it is deep drawn and shaped to define an annular enclosure defining an interior cavity that is open at one end and closed at the other end by an end wall. Subsequently, the end wall protrudes into the interior of the enclosure by pressing the preformed die laterally against the outer surface of the end wall and toward the inside of the cavity. Ta. It is deformed into a predetermined recess to form an integral front face of one case. After subsequently punching out the holes necessary to receive the actuating mechanism and providing a suitable rear enclosure, the case is complete and ready for use. This relatively simple assembly procedure allows a one-piece front pressure gauge case to be produced at significantly reduced cost while retaining all the advantages of conventional, more expensive constructions.

Therefore, the object of the invention is to be able to assemble it more cheaply than the prior art. The purpose was to create a new integrated front type pressure gauge case.

Another object of the invention is to provide a new method of manufacturing a pressure gauge case as described above.

Yet another object of the invention is to manufacture a pressure gauge having a case as described above.

Referring to Figures 1 and 2 of the attached drawings, number 1 (JK
Therefore, the pressure gauge case shown here is initially made in the shape of a small tap as shown in Fig. 1, but this is done by punching out a metal plate and deep drawing the cutout to form an annular peripheral portion 12 with a width of dimension A2. It is carried out as follows.

On the inside, a cavity 14 is formed which is open at one end 16 and closed at the other end by a connecting wall structure 18 . This is annealed when necessary and subsequently turned into a die of a predetermined shape with a force of 2o.

Two dimensions C and a diameter B laterally towards the outer surface of the wall 18
The old capital is added until it is formed as shown in Figure 2. An annular rim 21 is then optionally formed on the periphery. Preferably, the diameter C is about 85 to 97 times greater than the inside diameter B of the wall. After punching out the walls 12 and 18 to create the openings 22 and separates, respectively, the walls 18 form both the rear compartment and the rear compartment, and the case is left in its completed condition. This case is adapted to receive two actuating mechanisms and a rear shroud as described below with respect to FIG.

FIG. 3 will be explained. The case 10 houses a measuring mechanism 25, which includes a Bourdon tube 26 in a rear compartment 27.
This Bourdon tube is connected to a socket 28 through which the pressure to be measured is introduced as indicated by arrow 29.

In response to variations in the magnitude of the pressure 29, the Bourdon tube functions to drive the pointer 30 on the pointer shaft 32 opposite the dial 38 in the compartment 34. The actuation mechanism may be of the type fully disclosed by US Pat. No. 4,237,738, for example. A bushing 36 is preferably mounted by a press π into the center step 37 of the wall 18 and supports the pointer #132 and dial 38 in alignment with the hole 24. I'll make sure to package it properly to make it a 5.

A flange 32 of the hole is welded to the socket 28 at 33.

Gasket 42 having an annular groove and supporting window material 42
is attached around the rim 21 by being pushed into the partition base and frictionally engaged. A suitable rear cover assembly 44 is installed to protect against overpressure in the compartment 27, as described for example in 2, ``Temperature Compensator for Liquid-Filled Pressure Gauges,'' published March 9, 1983. may be of the type disclosed in U.S. patent application Ser. No. 473.829 entitled ``. As seen in Figure 4,
The gasket 40 is further mechanically secured by a metal cutout ring 46.

As described above, the front wall includes a metal plate and an annular side wall that are integrally combined. A novel integral front case structure for a pressure gauge has been disclosed. Typical sheet metal structures suitable for this purpose have thicknesses ranging from about 100 mrn to 2 mrn2, such as stainless steel.

It can be made of galvanized iron plate, brass casting, aluminum, etc. Since it is formed in this manner, it is easy to form an integral front type pressure gauge. It can also be seen that considerable cost savings have been achieved over conventional, purpose-built structures.

Many variations can be made to the arrangement described above and two different embodiments can be made without departing from the scope described above. However, all matters contained in the drawings and specification are illustrative and not restrictive.

[Brief explanation of the drawing]

1 and 2 are both formed in accordance with the present invention. FIG. 3 is a sectional view over time of the integral front type pressure gauge case. FIG. 3 is an elevational sectional view of a pressure gauge using the case of the present invention. FIG. 4 is an alternative structure for the portion indicated by the circle in FIG. lO: Pressure gauge case 12: Annular peripheral portion 14: Cavity portion 18: Wall structure 22, 24: Opening 25: Measuring mechanism 26: Bourdon tube 28 = Socket 34: Partition chamber 3
8: Adjustment plate patent applicant Dresser Indeno)
l)-'s Inc.

Claims (1)

[Claims] 1. An integrated front case for a pressure gauge, comprising a bonded metal plate structure forming an fR-shaped outer wall, and a diametrical plane facing inward with respect to the front surface of the outer wall. A one-piece front case having an integral front wall and means for accommodating a rear enclosure making it possible to relieve overpressure from the interior. 2. An integral front case according to claim 1, wherein the outer wall and the front wall are formed by an annular VI lung extending around the front periphery of the outer wall. 3. An integral front case according to claim 2, wherein the integral front wall has a diameter in the range of 85% to 97% of the inner diameter of the annular outer wall. 4. In the integral front type case according to claim 3, the metal plate is stainless steel. A one-piece front case made of one component selected from the group consisting of brass cast, aluminum or galvanized steel. 5. Used in a pressure gauge having a pressure sensing element operatively responsive to the pressure of a fluid to which it is connected, and an indicating mechanism that is displaced by actuation of said element to give a numerical value of the pressure of said fluid, said element and in a one-piece front case housing said indicating mechanism. a) A metal plate forming an annular outer wall. b) being integral with said outer wall and located in the diametrical plane of said outer wall, on the inside of said outer wall, between said element and said indicating mechanism; With integral front wall of metal plate. C) A one-piece front case with an enclosure behind said annular outer wall providing relief against overpressure from inside the case. 6. A one-piece front case according to claim 5, wherein the walls of the case are joined by an annular flange extending around the front face of said outer wall. 7. An integral front case according to claim 6, wherein the integral front wall has a diameter in the range of 85 to 97 percent of the inner diameter of the annular outer wall. 8,! In the integral front type case according to scope 7 of the RF permission requirements, the metal plate marked @ is stainless steel. A one-piece front case made of a component selected from the group consisting of brass cast, aluminum or galvanized steel. 9. In a method of manufacturing an integral front case for a pressure gauge. a) Punching out a metal sheet of predetermined dimensions. b) Transforming the punching into a kelp-like shape with an annular wall creating an inner cavity closed at one end with a wall and open at the other end. (i) causing said end wall to be laterally deformed to a displaced position on its diametric surface towards the front of the annular wall; A method comprising the steps of: 10. In the method according to claim 9, the step of deforming the end wall optionally forms an annular flange extending around the annular wall and joining the end wall with the annular wall. Method. 11. The method according to claim 10, wherein the metal plate is made of a component selected from the group consisting of stainless steel, brass, aluminum or galvanized steel.