DE2320141A1 - BAROMETER BOX AND METHOD OF MANUFACTURING THE SAME - Google Patents

Description

DR. MÜLLER-BORE DI- ³ L-PmYO. OR WlAN IT ^ ΠΙΡ '..- CHEM. DR. DEUFEL DIPL-ING. FiNSTERWALD DIPL.-ING. GRÄMKOW

PATENT LAWYERS

GN / IQi - S 2526 April 19, 1973

232QH1

Springfield Instrument Company, Inc.

260 Railroad Avenue, Hackensack,
JSfew Jersey 07602, USA

Barometer box and procedure
to manufacture the same

The invention relates generally to pressure responsive Instruments, in particular aneroid barometer boxes and a method for producing the same.

With a typical. Instrument movement for an aneroid barometer and the like, a can or membrane is provided, iie pressure sensitive and via a movement enhancement system rait is coupled to an indicator, usually a rotatable pointer, which is appropriately calibrated Moving the scale surface. Various instrument arrangements of this general type have emerged over the years

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has been suggested - but there is always the necessity for further simplification of such arrangements, their Manufacture and their assembly process in place to an instrument drive., to create mass-produced on the basis of a relatively low unit cost can be produced.

More in detail are the membranes or can parts that make up the can assembly for such an instrument record, usually spot-welded or soldered together, which is a relatively complex and expensive manufacturing technique requires.

Another difficulty with the usual doses and LIe-U-branes and the methods of making the same is the difficulty of properly orienting the various Parts of the cans and membranes, for example orientation the can parts to each other and the support pin eni, the is often attached to one of the can parts. As a precise orientation of the parts of the can or membrane for What is necessary for accurate operation of the pressure responsive instrument is failure to achieve precisely oriented membrane or can and / or the difficulty in achieving the same an important problem in this technique.

Accordingly, it is an object of the invention to provide an improved and simplified method of manufacture and for To assemble a pressure-sensitive instrument box, as is commonly found in aneroid barometers is used. In particular, the invention intends to provide a method of production and to create a useful device for this,

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such that the can is manufactured at a relatively low cost per unit on a label basis can throw and with which a can is provided in which the various ropes of the same can be easily and precisely oriented.

Lei an explanatory statement, which the objectives and Principles of the invention shows is a method of manufacture and for the assembly process for one on pressure Renting instrument box provided. The can has first and second circular socket parts, the first of which has a centrally located nipple and has concentric lines, the periphery of a generally upward and outward stretching! are tuügebea. The second part determines a central one Pin hole and a vacuum opening directly to it. That The second part also includes concentric waves and one peripherally arranged horizontal flange, which is in the upwardly and outwardly extending flange of the first part can be used. The method includes the steps of forming two l.iembranen or can parts under Use of common techniques by punching out of a suitable metallic alloy, / poor treatment of the Parts to achieve suitable hardness in a reducing atmosphere and the assembly of the parts together. The can parts interlock with each other in an upward and outward puddle one of the parts circumferentially the horizontal flange encompassing, whereby the can parts are correctly oriented, vertically oriented, threaded The calibration spigot is then partially centered in the. second part located mortise brought with the mortise accurately orientating the tenon. The pin with a G-thread has an insert

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Limiting flange for placing the pin on the second part. The assembly, including the can parts and the spigot, is then placed in a holding device, which keeps the parts in close contact. An Epöxi adhesive is then applied to the perimeter of the two can parts and near the mortise, = and the vacuum opening, which is arranged next to the mortise in the second part, given. The fixed holding device and the can structure are then placed in an oven, the air between the parts is extracted by means of a vacuum pump, which acts through the vacuum opening, and the adhesive is then cured by switching on the oven heat.

According to another embodiment, showing the objects and measures of the invention, is an alternative method intended for the manufacture and assembly process for a pressure-responsive instrument box. The can has first and second circular can parts, the first of which has a centrally mounted Ijippel and concentric rushes, the periphery through ejSenj general upwardly and outwardly extending flange are surrounded. The second part defines a central one Hole and also contains concentric cells and a peripherally arranged horizontal surface of the in the · upwardly and outwardly extending flange of the first part can be used. The method includes the steps of forming two bracelets or can pieces using known assembly techniques the parts with each other. The can parts are engaged with the upwardly and outwardly extending one Splash one of the parts that is circumferentially identical to the horizontal Splash of the other part engages and thereby precisely orientates the can parts. A vertically oriented, threaded calibration spigot is then

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partially inserted through the mortise provided centrally on the second part, the mortise the pin precisely oriented. The threaded pin defines a central bore for evacuation of the space between the can parts and also includes an insert limiting spigot flange for mounting the On the second element. The assembly, including socket parts and tenons, is then turned into a Holder for holding the parts in tight contact and an epoxy-IIleber is then brought into the, formed by the upwardly and outwardly extending flanges of the can parts. Of the Construction is then placed in an oven, whereby the epoxy adhesive is cured and a vacuum-tight seal is in between the first and second socket parts on the periphery thereof and between the spigot and the second part on the spigot flange is created. The assembly is then placed in a vacuum chamber and the air between the can parts is sucked through the bore of the pin, whereupon the bore of the pin is closed by a solder type seal which is introduced into the bore.

The invention provides a barometer box and a method of manufacturing the same with the manufacturing method for opposing socket parts, for their assembly with one another and with a calibration spigot and for the evacuation of air in the space between the can parts.

The invention is described below by way of example with reference to the drawing; in this shows:

Fig. 1 is a view of the can parts and a pin of an embodiment of the invention before Assembly according to the manufacturing process of this version;

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Pig. 2 shows a section along line 2-2 in Pig. 1 by components of the first embodiment;

Pig. 3 is a view of the assembled components according to Pig. 1 and 2;

Pig. 4 shows a partial section along the line 4-4 in Pig. 3 with added sealant;

Pig. Figure 5 is a top view of Pig. 4;

Pig. 6 a schematic view of the structure according to FIG. the pig. 4 and 5 in a suitable holder in the furnace according to this embodiment;

Pig. 7 shows a partial section like Pig. 4> however shows the can parts and a spigot of an alternative embodiment and to form a Can assembly assembled according to the manufacturing process for this alternative design is;

Pig. 8 is a view similar to Pig. 6, but the

Structure according to Pig. Figure 7 shows according to the alternative embodiment in an oven; and

Pig. 9 is a schematic view of the construction according to Pig. 7 in an evacuation and pin sealing chamber according to the alternative design.

In the drawing is a manufacturing method and an assembling process for a pressure-responsive en-dose instrument. The operating environment for the can

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is known from UG-PS 3 631 723. In this patent specification, the pressure-sensitive instrument is described as that it contains a motion transmission mechanism with a slightly calibrated can. The tin thereafter includes a pair of can plates or pieces attached to their perimeters and so attached are that at least one can / is movable within the can as a function of ./ change in the fluid pressure. The movement of this part is controlled by an amplifier lever system transferred to a display element.

A can that can be used for this system, as it is in the The above-mentioned US patent is according to the methods described below and Assembly process produced.

According to the casual. 1 and 2 are the can components according to. this embodiment of the invention shown, namely with a first box part 10, which from a plate .vorrat how 0.125mm (0.0045 ") metal alloy is punched and then through in a reducing atmosphere ..lime treatment is given a suitable hardness. The first can part is substantially circular with a peripherally disposed generally upwardly and outwardly extending flange 12 and concentric yokes 14, which have a sinusoidal cross-section (see Pig. 4). The first can part 10 is as a movable part in the the aforementioned patent provided, wherein a motion-transmitting rJippel 16 is arranged in one piece with and centrally on the first socket part 10, in the direction of the movement-enhancing lever system as indicated above.

The can also has a second can part 18 containing metallic material like the other can part and

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is substantially circular around a peripherally disposed, horizontally extending flange 20 and to form concentric waves 22, which also have a sinusoidal cross-section. The shafts 14, 22 are provided to the can the necessary in this system To give Peder constant. · ■ ·

The horizontal flange 20 is such relative to the flange 12 dimensioned so that it can sit on a shoulder 13 that extends horizontally outwards between the outermost shaft 14 and the flange 12 of the first can part. As will be described later, this enables the flange 12 to engage the flange 20 of the second can part and thereby the first and second can parts to orient, with a cone-like angle of the outwardly and upwardly extending flange 12, which the Orientation of flange 20 during assembly of the can.

Another can component is a can spigot 24 with a threaded part 26 and a socket insert part 28, these two parts being separated by a Zajjfenflansch 30 are. As described in 'the cited patent,' is the can spigot 24 for adjustable carrying of the can attached to a base plate or similar to create a "fixe Reference position for the movement that responds to pressure to have. It is therefore important that the longitudinal axis of the pin 24 coincides with the center of movement of the movement B-transfer nipple 16 is axially aligned. TJm the! Dismantling of the socket neck 24 and the second socket part 18 To facilitate this, the second socket member 18 (FIG. 2) is constructed to define a central mortise 32 and the diameter of the mortise 32 is slightly larger than the diameter of the tenon portion 28 which is therein should be used.

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One end of the threaded socket pin 24 has a cross-section 24a for the insertion of a screwdriver blade o.a. to facilitate, so that the upper surface 16a defined by the nipple 16 in a required Distance from the can holder base (not shown) can be oriented to calibrate the instrument.

Another feature useful in the assembly process according to the invention described herein is a vacuum port 34 defined through the second can portion proximate the centrally located mortise. The use of the vacuum port 34 will be apparent from the detailed description of the manufacturing process below and the assembly process according to this invention Execution.

Initially, the first and second can parts 10, 18 are nested so that the horizontally extending Splash 20 of the second can part 18 into the upwardly and outwardly extending splash 12 of the first box part is fitted. The conical or angular shape of the flange 12 guides the second can part into position and the flange 20 rests on the shoulder 13 of the first can part. The angular shape of the flange 12 also prevents the flange 20 from seating on the upper lip 12a of the flange 12.

The can spigot 24 is then partially in a vertical orientation through the centrally arranged mortise ^x ? of the second can part pushed so that the

portion 28 is inserted through the mortise 32. Of the enflansch 30 acts as a limitation for the insertion, w that the flange 30 on the outward facing Surface 36 rests defined by the second can part

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is. It can be seen, especially from Pig. 4 that the splash 30 extends partially over the vacuum port of the can. At this point in the procedure it is the assembly of the first and second socket parts 1.0, 18 and the threaded socket spigot 24, like it in Pig. 3 is shown. Submit construction will then placed in a holder 38 (Pig. 6) to keep the assembly in firm contact.

A low viscosity sealant, such as an epoxy 40, is applied to it as described in the Pig. 4 and 5 shown, added to the structure. The epoxy adhesive, which is of the type can be, as it is manufactured by the Pittsburgh Plate Glass Co. under the name Bondmaster M 773, can by any suitable means such as by extruding such an adhesive from an injector type Syringe in the a 15 of the first and * second Can part are introduced, which is formed by the relevant peripheral planes 20, 12. The adhesive 40 will be carried out in the same way at the merging of the Trunnion flange 30 and the exposed face 36 of the second socket part are attached. It is recognizable, especially in Pig. 4, that the adhesive 40 is caused to flow over the vacuum opening 34 next to the trunnion flange 30.

The bracket 38, which may be of the stackable tray type for mass production, and the first and second - Can part on the can pin 24 after the epoxy glue has been applied, is placed in an oven 42 brought the final procedural steps for this execution according to the invention. The oven 42 is both as a heating device as well as a suction chamber for the

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Evil intended. Thus, the furnace is shown schematically as a Heating element 44 shown including, which has a suitable power line 46 to a ** not shown Power source is connected. The oven 42 also has a vacuum exit 48 to facilitate evacuation of the can structure.

The air in the furnace 42 is thereby drawn off by means of a vacuum pump or some other conventional mechanism evacuated through vacuum exit 48. At this point in the process the epoxy or other adhesive 40 is still sufficient able to flow to air between the can parts 10, 18 to allow the .glue to be blown out and the Glue too. move until the air is completely evacuated is. At the point of complete evacuation of the chamber defined by the first and second can parts the furnace element is turned on to create conditions conducive to the curing of the adhesive. Example ■ wisely, the can use the heat for about 15 or 20 minutes a curing temperature of about 120 ° 0 can be maintained.

Alternatively, the oven 42 can be constructed so that the heating element 44 is automatically turned on when the Space between the first and second can parts reaches a predetermined negative pressure. A facility for Performing such an automatic operation is easy to obtain as being well known in the art. For example is made by using an epoxy adhesive low viscosity and an automatic control for the oven and the pressure reduction before switching on the './arms the resistance of the spring-loaded peripheral Part of the can is larger than that of the vacuum port 34 and a total evacuation is by blowing the last one out Remnants of air possible through this opening. If the

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Heat is switched on automatically, the epoxy Adhesive is initially less viscous and "begins to harden, which is promoted by complete evacuation. The fully evacuated construction is through the box in Fig. 3 shown in which the waves are flattened.

To facilitate a further understanding of the invention, a summary of the following follows Method of manufacture and assembly process as described above for this embodiment of the invention " have been.

Initially, the two parts of the can are used conventional stamping techniques are made from suitable metal alloy and then the can parts heat-treated in order to obtain a suitable hardness under a reducing atmosphere. The first and that second can parts are then inserted by inserting the horizontally extending peripheral flange of the one composed in the upwardly and outwardly extending peripheral planes of the other, the the latter for guiding the horizontal flange into its assembled position under seat on the shoulder of the first part of the can is used. When receiving the Her- · Position tolerances for the two can parts, the two can parts are oriented relative to one another ^ θαΘτ » by engaging the flange in question with the shoulder of the first can part. One vertical oriented pin provided with a G-thread is then partly arranged in a pin hole, which opens centrally the second can part is provided. The G-threaded pin has an insert-limiting pin flange 30 for placing the pin on the free surface of the second box part 18. By keeping the manufacturing

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tolerances of the two door parts and the threaded pin, the pin becomes relative to the can parts disposed in the pin hole and the pin is oriented with the motion transmission nipple and is axial aligned.

The structure with the first and the second socket part .and the threaded cup plug is then placed in a suitable holder 38 to hold the cup components to keep in close contact. An epoxy glue is then added to the perimeter of the two elements in the trough, which is formed by the two circumferentially arranged flanges and almost centrally of the second can part, where the tenon is inserted. The adhesive is caused to flow around the insert limiting trunnion flange, so that it covers the exposed part of the vacuum opening 34 which is not covered by the trunnion flange 30. The holder holding the can structure is then placed in an oven and a suction chamber for the purpose of evacuating the room placed between the can parts through the vacuum port 34 and the still fluid adhesive. On a particular one At point or degree of vacuum in the space between the can parts, the oven is turned on, causing the glue is cured.

7 through 9 are an alternate embodiment of a pressure responsive can assembly and method for the production of the same according to the invention. The can assembly includes a first and a second can part 10 ', 18 * and a can spigot 24'. That first and second can parts 10 ', 18' are essentially identical to those previously described, except that that the second can part 18 'is modified to eliminate the vacuum port 34 (see Pig. 4 and 7).

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hence there is no further discussion of the can parts necessary.

The pin 24 'is also the same as the pin described above and has a threaded part 26, a can insert part 28 and a trunnion flange 30. However, the trunnion 24 'is modified to have a central evacuation channel 50. The evacuation channel 50 has one cylindrical bore 50a near the top of the pin 24 ', a cylindrical bore 50b of smaller inner diameter than that provided near the bottom of the pin Bore 50a and an intermediate fluted bore 50c extending between bores 50a and 50b. Through the central bore or the vacuum passage 50, the space between the first and the second Can part 10 ', 18' evacuated.

The assembly sequence according to this exemplary embodiment according to the invention begins in the same way as the one previously described, The first and second can parts 10 ', 18' are first inserted into one another, so that the horizontally extending pool 20 of the first can part 18 in the upwardly and outwardly extending Flange 20 of the second can part is fitted. The angled shape of the flange 12 guides the second can part in the position on the shoulder 13, whereby a

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the can parts are expedient and oriented.

The socket spigot is then partially in a vertical orientation through the centrally arranged spigot bore 32 of the The second socket part is inserted in such a way that the pin part extends through the pin hole 32. Because of the matching Orientation between the first and the second socket part and, in addition, because of the low manufacturing

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tolerances, the pin 24 ^{f is} correctly oriented and held in axial alignment with the movement-transmitting nipple of the first socket part.

In the same manner as described above, low viscosity epoxy adhesive is used in the 15 des first and second members inserted through their respective peripheral flanges. The glue will be on same way when merging the trunnion flange 30 and the exposed surface 36 of the second can part admitted.

The assembly is then placed in an oven 52, the same the oven 42 already described. However, it works Oven 52 only as a heating device or curing chamber for the tacky epoxy adhesive and therefore does not contain a vacuum outlet 48 (see FIGS. 6 and 8). The structure remains for a sufficient time to cure the tacky epoxy 40 in the curing chamber 52, for example for approx. 15 or 20 limits at one curing temperature of about 120 ° G.

The previously non-evacuated can structure, in which the first can part and the second can part with each other and the Spigot connected to the second socket part is then placed in an evacuation chamber 54, the assembly rests on an appropriate support structure 56. The space between the first and the second can part is then evacuated through the vacuum outlet 48 by a vacuum pump or other conventional device, the Air is drawn off between these can parts through the vacuum passage 50 in the pin 24 '. The passage will afterwards sealed to the pressurized can under her evacuated Leave influx. .

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For example, the passage 50 can be through use a Vifeichlotstücks are sealed before the Evacuate in. The hole 50a is inserted * The piece of soft solder does not interfere with the evacuation of the can. After the evacuation is complete, the solder piece ' melted to close the journal passage. For example can be the soft solder piece by using a Induction coil 58 melted around the spigot is arranged around in the vicinity of the soft solder piece. After the air is evacuated from the can chamber, the induction coil is activated for a short period of time, about a few seconds or similar. The Y / eichlot piece melts and flows partially down the bore 50b, thereby sealing the plug.

It should be noted that the bore 50b is large enough to to evacuate the skin between the can parts easy to make ^ but small enough to flow of the soft solder into the can. Vfie at the before the described execution can be known techniques, for automatic operation of the furnace 52 and the evacuation chamber 54 can be used.

This makes a can for use in one on pressure responsive instrument created in a simple yet reliable and economical manner. The assembly process enables mass production at low cost and additionally creates a can with components that are properly oriented relative to one another ensuring accurate operation of the pressure sensitive instrument.

It should be noted that in the various figures

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certain technical freedoms have been exercised. For example, the can is in practice in its "relaxed" Remaining state, that is the definition of arc-shaped elements for the respective waves of the elements Surfaces until the can is evacuated. Once the can is evacuated, the can parts flatten and become parallel to each other. For the sake of simplicity, however, the can in Figures 1 and 2 is in the relaxed state shown.

- patent claims -

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Claims (18)

2320H1 Claims 1J A method of making a can assembly for a pressure responsive instrument having a first
and a second can part and a calibration pin, the first can part being brought into contact with the second can part at their peripheries with one another, characterized in that the calibration pin is through
a mortise is made in the second socket part
is that a sealant is applied to the perimeter of the can parts that the space between the
Can parts is evacuated and that the can assembly is sealed. 2. The method according to claim 1, characterized in that the sealing of the can assembly comprises the step of curing of the sealant. 3 «Method according to claim 2, characterized in that the hardening step is carried out by applying heat will. 4. The method according to claim 31, characterized in that heat at approx
is turned. Heat at approx. 120 ° C for between 15 and 20 minutes. 5. The method according to any one of claims 1 to 4, characterized
characterized in that the sealant is also applied
the merging of the tenon and mortise is applied. 309ß8 370 90 2320H1 6. The method according to any one of claims 1 'to 5 »characterized in that the second can part with a flange extending horizontally on its periphery is provided, and that the first can part is provided on its periphery with a generally upwardly and outwardly extending flange. 7. The method according to claim 6 »characterized in that bringing the first can part into contact with the second can part and properly orienting the can parts with the upwardly and outwardly extending flange of the first can part as a guide serves for the horizontally extending flange of the second can part in its position, 8. The method according to any one of claims 1 to 7 *, characterized in that the evacuation of the space between the can parts through a vacuum opening in the second Can part is carried out. 9. The method according to any one of claims 1 to 7> characterized in that characterized in that evacuating the space between the can parts by a vacuum passage in the Calibration spigot is carried out. 10. The method according to claim 9 »characterized in that the sealing of the can assembly with curing of the Sealing means is carried out prior to evacuation, and that further sealing the vacuum passage of the Calibration pin takes place after evacuating the can. 11. can for use in pressure sensitive instruments; made according to the method of claim 1, characterized in that the first 309883/09 (H. 2320 -U1 Can part (10) one with this one-piece central Motion transmission nipple 1 (16), and one first band flange (12) that the second can part (18) with a central pin hole (32) "is provided on a second edge flange (20), that a combined holding and calibration pin (24) has a protrusion (28) which extends into the pin receiving hole extends that a device (30, 40) for attaching the pin to the second socket part and for producing a vacuum-tight connection therebetween it is provided that the first and the second ■ edge flange so constructed and relative to one another are arranged * that they are the pin relative to the Motion transmission nipples orient that the edge flanges are also constructed and arranged to form an upwardly opening annular trough, set up for receiving a sealant (40) is to provide a circumferential vacuum-tight connection between the first and the second can part to accomplish. 12. Can according to claim 11, characterized in that the sealant is a low viscosity adhesive. 13. Can according to claim 12, characterized in that the low viscosity adhesive is an E-poxy adhesive. 14. Can according to claims 11, 12 or 13 »characterized in that that the second box part defines a vacuum opening (34), and that the calibration pin a trunnion flange (30) which defines the vacuum port partially covers. 15. Can according to claims 11, 12 or 13, characterized in that 3098 8 3/09 (U indicates that the calibration pin has a vacuum passage (50) defined for evacuating the space between the first and second can parts is constructed and arranged. 16. Can according to claim 15, characterized in that the vacuum passage one through the calibration pin going central hole is. 17. Can according to one of claims 15 or 16, characterized in that that the vacuum passage has a first bore section (50a) and a second bore section (50b) with a smaller inner diameter than the inner diameter of the first bore section. 18. Can according to one of claims 11 to 17, characterized in that indicates that the calibration pin with the movement transmission nipple is axially aligned. 309883/0 904