DE2133118A1 - Barometer capsule and process for their manufacture - Google Patents

Description

DR. MDLLER-BORE DIPL-PHYS. DR. MAN ITZ DIPL-CHEM. DR. DEUFEL DIPL-ING. FINSTERWALD DIPL-ING. GRXMKOW

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PATENT AGENCIES ^ '° °'' ^w

Munich, the 2nd JUU We / Obd - S 2291

SPRINGFIELD INSiERUMBFT COMPANY, INC.

260 Railroad Avenue Hackensack, New Jersey 07602, USA

Barometer capsule and process for their manufacture

The invention relates generally to pressure sensitive instruments and in particular an aneroid barometer capsule and a method for producing the same.

In a typical instrument movement for an aneroid barometer or similar instrument is a capsule or diaphragm provided, which are pressure-sensitive and have a movement-enhancing device System with an indicator, usually a rotatable pointer, which is suitably calibrated via a Scale surface moved, coupled. Over the years, various instrument designs have been this common ! Type has been suggested, but there is always a need for a further simplification of such constructions and

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their manufacture as well as their assembly in order to be economical To provide instrument movement systems which are suitable for a relatively low cost per unit in one To be mass produced.

In particular, the diaphragm or the capsule elements are which contain the capsule construction for such an instrument, usually spot welded or soldered together, what requires relatively complex and expensive manufacturing techniques.

According to an illustrated embodiment of the invention a method for making and assembling a pressure sensitive instrument capsule is provided. The capsule includes a first and a second circularly designed capsule element, The first has a centrally arranged nipple and concentric elevations which extend in the circumferential direction are surrounded by a high splash. The second element lays a central pin opening and one near it vacuum opening arranged for this purpose. The second element further comprises concentric bumps and one in the circumferential direction arranged horizontal flange, which can be inserted into the upright flange of the first element. The procedure includes the steps of forming two diaphragm or capsule members using conventional techniques by punching out of a suitable metal alloy, subjecting the elements to a heat treatment in order to achieve a suitable hardness in a reducing atmosphere and the elements to connect with each other. The capsule elements fit together that the flange of one surrounds the flange of the other. A vertically directed threaded calibration port is then partially passed through the nozzle opening, which is centered arranged on the second element, the thread

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clip has an insertion limiting pin flange to a Form seat of the nozzle on the second element. The arrangement including the capsule elements and the connecting piece is then shown in brought a fixture that keeps the elements in firm contact. An epoxy adhesive is then applied to the perimeter of the two capsule elements brought as well as near the nozzle opening and the vacuum opening, which next to the nozzle opening on the second Element is attached. The attachment and the capsule arrangement are then placed in an oven, the air between the capsule elements is sucked off by means of a vacuum pump that works through the vacuum port, and the adhesive is then turned on solidified by the heat of the oven.

The invention is explained below, for example, with reference to the drawing described} in this shows:

Pig. 1 shows a front view of the capsule elements and the maree assembling according to the manufacturing method of the invention,

Pig. 2 shows a partial section of the components of FIG. 1 along the Line 2-2 of the same,

Pig. 3 is an elevation of the assembled components of FIGS. 1 and 2;

Pig. Fig. 4 is an elevation of the arrangement of Fig. 5 in partial section the line 4-4 of the same with an applied sealing base,

Pig. 5 is a plan view of the arrangement of FIGS 6 is a schematic front view of the arrangement of FIGS. 4 and 5, as in a suitable attachment in one Oven is held according to the invention.

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2133115

In the drawing is a manufacturing method and an assembling method for a pressure sensitive instrument capsule illustrated. The working environment is best in the USA patent application No. 46326 with the listing date of July 15, 1970. In this application it is pressure sensitive Instrument so "described that it transmits motion Has construction which contains an easy-to-calibrate capsule. As described, the capsule comprises a Pair of capsule plates or elements, which at their circumference attached and so .arranged that at least one of the Capsule elements in response to changes in fluid pressure within the capsule is movable. The movement of this element is indicated on a display element by means of a lever device that avoids movement transfer.

A capsule which is for use in the above-mentioned ■ United States patent application described system is suitable according to the following description of the production and Assembly process manufactured.

As shown in Figures 1 and 2, the capsule components include a first capsule member, indicated generally at 10, which can be stamped from sheet material such as a metal alloy 0.11 mm (0.0045 inch) thick and then onto a suitable one Hardness is brought about by subjecting ea to heat treatment in a reducing atmosphere. The erate capsule element has a generally circular shape and has an upstanding flange 12 arranged in the circumferential direction and concentric elevations or waves 14. In the above-mentioned US patent application, the erate capsule element is intended to be a movable element, as has already been stated above, ao that the movement-transmitting Xlippel is arranged in the middle of the first capping element 10 so that it protrudes in the direction of the movement-increasing lever system according to the above statements.

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The capsule also includes a second capsule element, indicated generally at 18 ", made of a metallic material like the other capsule element and formed generally in a circular shape, about a circumferentially extending horizontally extending panel 20 and concentric bumps, set or shafts 22. the flange 20 of the second capsule element is slightly less held in diameter than the flange 12 of the first Kapaelelementes. as a result, the matching assembly is facilitated. Further are provided _M projections or shafts 14 and 22 to the capsule, the ™ in System to give the required spring constant.

Another capsule component is a capsule nozzle or capsule pen 24, which has a threaded part 26 and a capsule insert part 28, wherein the two parts of the nozzle 26, 28 through a nozzle flange 30 are separated from each other. Like in the is described above USA patent, the nozzle is used 24 for an adjustable mounting of the capsule on a base plate or a similar element in order to form a fixed reference position for the movement-sensitive movement. Of the Capsule connector 24 is intended to extend in the axial direction of the capsule. To assemble the capsule nozzle 24 and the two- ^ j th capsule element 18 to facilitate is the second capsule element 18 (see ilgur 2) so designed that there is a centrally arranged Stutzen hole 32 and that the diameter of the StuGzenloches 32 is slightly larger than the diameter of the nozzle part 28, which is to be inserted into this hole.

One end of the threaded capsule nozzle 24 is with equipped with a transverse slot 24a to facilitate its insertion with a screwdriver or similar device, so that the flat surface 16a, which is defined by the nipple 16, to the required distance from the cap

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• The mounting base plate (not shown) can be adjusted can to calibrate the instrument.

Another feature that primarily applies to the one described above Assembly method expediently i3t, the vacuum port 34, which is through the second capsule element in the vicinity of the centrally arranged ütutzenlochea voi * is seen. The usage the vacuum port 34 will be understood from the detailed description below of the manufacturing and assembly process according to the invention clearly. First up are the first and the second Capsule element 10 and 18 fitted into one another in such a way that the horizontally extending puddle / of the second capsule element 18 in the upwardly directed puddle 12 of the first capsule element fits in. The capsule nozzle 24 is then brought into a vertical alignment so that it is partially through the centrally located The nozzle hole 32 of the second capsule element protrudes so that the nozzle part 28 is inserted through the nozzle hole 32 is. The nozzle flange 30 serves as a stop for the insertion, so that the flange 30 rests on the outwardly facing surface 36 which is defined by the second capsule element is. It can be seen, in particular from FIG. 4, that the flange 30 is partially over the vacuum opening 34 extends for the capsule. At this point in the process, assembly of the first and second capsule elements 10 and 18 and the threaded capsule connector 24 in FIG Figure 3 shown. Such an arrangement is then incorporated into a fastening device 38 (see FIG. 6) brought to keep the assembly in firm contact.

A sealing base such as an epoxy lifting material 40 will wear off brought the arrangement, as shown in particular in FIGS. The epoxy adhesive can be applied to any Art can be applied, for example a solo adhesive from an injection-like syringe into the connection of the

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first and second capsule elements near their respective ones See the circumference 20 and 12. The adhesive 40 is in the same way to the connection of the nozzle flange 30 and the protruding surface 36 of the second capsule element brought. In particular from Figure 4 it can be seen that the adhesive 40 is caused to over the vacuum opening 34 next to the nozzle flange 30 to flow.

The attachment 38 which g for mass production after the stacking tray-Prlnzip may be constructed which the first and second capsule member and the capsule nozzle 24 is supported, after the epoxy adhesive was applied 40 or a similar adhesive which is placed in an oven , indicated generally at 42, to carry out the remaining steps of the process. The oven 42 is intended to serve both as a heater and as a suction chamber for the capsule. Accordingly, the furnace is shown as having a heating element 44 which is connected to a suitable energy supply 46 which is connected to an energy source (not shown). Oven 42 further includes vacuum release means 48 to facilitate evacuation of the capsule assembly.

The air in the furnace 42 is thereby by means of a vacuum pump or by means of another suitable device through the vacuum outlet opening 48 sucked off. At this point in the process, the epoxy or other adhesive 40 is still sufficient fluid, so that the trapped between the capsule elements 10 and 18 Air can come out through the adhesive in bubbles, by displacing the adhesive until the time the air is completely evacuated. At the point of complete Evacuation of the chamber, which is defined by the first and the second capsule element, the furnace heating element 44 is switched on, to create an environment suitable for hardening

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or the solidification of the adhesive is beneficial. For example, the heat can last for about 15 to 20 minutes at a solidification temperature must be kept at around 120 degrees Celsius.

Alternatively, the oven 42 can be designed so that the heating element 44 is automatically switched on when the room a predetermined vacuum is achieved between the first and the second capsule element. Suitable facilities for implementation such an automatic device are well known in the prior art. For example, by using an epoxy adhesive with a low toughness and an automatic heat control for the furnace and the pressure reduction before switching on the heating, the resistance of the spring-loaded peripheral part of the capsule is greater than that the vacuum port 34, and a complete evacuation is made possible, because the very last small amount of air can blow off through this opening. When the heater is switched on automatically If the epoxy adhesive is initially less tough because it begins to harden, and this prevents complete evacuation Further. The fully evacuated structure is through the capsule of Figure 3 is shown where the waves or ridges are flattened bind.

To facilitate a complete understanding of the invention, a summary of the method of manufacture and manufacture is provided Assembly given, as already described above;

First, two capsule lernente are made by conventional ! © eJaniken of punching out of a suitable metal alloy applied t ^ earth ^ and then the caps el elements become one Subjected to heat treatment in order to soften a suitable hardness in a reducing atmosphere, bas first and the awsite capsule element are then assembled by moving the horizontally extending outer flange of one into the highest

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existing TJmündsflansch, the other is used. Then a vertically arranged threaded connector is partially passed through a connector opening which is arranged centrally in the second element. The threaded port includes an insert restriction port flange 30 for inserting the port into the protruding surface of the second capsule member 18. The assembly of the first and second capsule members and the threaded capsule port is then brought into a suitable fixture 38 to hold the capsule components in spring-like-the-art touch. An epoxy adhesive is then applied around the perimeter of the two capsule elements and near the center of the second capsule element where the nozzle is inserted. The adhesive is caused to flow around the insert restriction neck flange so as to cover the exposed portion of the vacuum port 34 which is not covered by the neck flange 30. The fixture holding the capsule assembly is then placed in an oven and suction chamber for evacuating the space between the capsule elements through the vacuum port 34 and the still fluid adhesive. At a particular point or degree of vacuum in the space a between the caps el 3,1 emen th the oven is switched on so that the adhesive hardens.

A capsule for use in a pressure sensitive instrument or similar device is made simple, however manufactured reliably and economically. Also suitable the process of mass production at a low cost.

- patent claims -

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Claims (8)

- ίο - Claims Method for heat-dividing a capsule construction for a pressure-sensitive instrument with a first and a second capsule element and a calibration connector, characterized in that the first capsule element is brought into contact with the second capsule element at the periphery thereof, that the calibration connector is inserted through a connector opening in the second capsule element that a sealant or adhesive is applied to the periphery of the capsule elements _f that the space between the capsule elements is evacuated and that then the adhesive or the sealant hardened 2. The method according to claim 1, characterized t j "that curing by applying τοη heat to the Adhesive takes place. 3. The method according to claim 2, characterized t that heat is about 120 degrees Celsius above a period of between 15 and 20 minutes is used. 4. The method according to claim 1, characterized in, that the adhesive or the sealant continues to be applied to the connection of the nozzle and the nozzle hole will. 5. The method according to claim 1, characterized gekennseichn et that the method has the further steps of equipping the second capsule element with a horiaontal © 2? Stretching flange on its circumference νΐίά that he -. "Te capsule element with an upstanding flange on his abranged the art form that, when- the elements are in contact, 10988 7/0260 the upstanding flange the horizontally extending one Surrounding flange. 6. The method according to claim 1, characterized in that that the method comprises the further step of contacting the JEL elements in a fastening device to hold while the adhesive or the sealant is applied. 7. Kapselmeohanismus for use in a pressure-sensitive like instrument, characterized in that a first capsule member is provided having an upstanding in the peripheral direction arranged flange, that a second casing element is provided, which ^ inen in circumference direction is arranged horizontally extending flange has, and Opening for receiving a nozzle and a vacuum opening defines that a calibration bag is also provided, which is partially inserted into the opening provided for receiving the nozzle and that a cured adhesive of low viscosity at the location of the flanges and in the vicinity of the intended for receiving the nozzle Opening as well as the vacuum opening is present. 8. capsule mechanism according to claim 7 »characterized in that the calibration bag has an insert, has a threaded part and a nozzle flange, which separates these parts from each other and partially covers the vacuum opening. 109887/0260 Blank page