CA1218878A - Integral solid front gauge for a pressure gauge - Google Patents
Integral solid front gauge for a pressure gaugeInfo
- Publication number
- CA1218878A CA1218878A CA000451700A CA451700A CA1218878A CA 1218878 A CA1218878 A CA 1218878A CA 000451700 A CA000451700 A CA 000451700A CA 451700 A CA451700 A CA 451700A CA 1218878 A CA1218878 A CA 1218878A
- Authority
- CA
- Canada
- Prior art keywords
- wall
- case
- annular
- solid front
- gauge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/14—Housings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
- G01L7/04—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges in the form of flexible, deformable tubes, e.g. Bourdon gauges
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Abstract of the Disclosure A case of sheet metal construction for a pressure gauge having a solid front case wall extending integral from the annular sidewall of the case.
Description
~21~87~3 INTEGRAL SOLID FRONT GAUGE CASE FOR A PRESSURE GAUGE
-Background of the Invention 1. The field of art to which the invention pertains includes the art of measuring and testing as directed to fluid pressure gauges.
-Background of the Invention 1. The field of art to which the invention pertains includes the art of measuring and testing as directed to fluid pressure gauges.
2. Gauge instruments and particularly pressure gauges or the like have been widely used and are commercially avail-able from a variety of manufacturing sources. Being that such pressure gauges enjoy very extensive commercial and industrial use, they are supplied by a plurality of menu-lecturers and are regarded as high production items. Because they are sold in very price conscious competition, each menu-lecturer instinctively strives to reduce product costs by improvements, however marginal, which reduce labor and/or materials that can contribute to cost savings in the end product.
A common form of case construction for a pressure gauge comprises the "solid front" type in which an intermediate wall separates the case into front and rear compartments.
In the usual arrangement, the front compartment contains the indicating mechanism, whereas the pressurized element is contained in the rear compartment such that should the element incur failure from overpricer or whatever, relief is afforded rearward rather than forward of the case. Con-struction of the solid front gauge case is largely governed by the American National Standard Institute (ANSI) Standard B40.1-1974, Section 3.1.1.2.
Jo 12~8878 Typical prior art solid front gauge case constructions as shown by the patent literature include those in which the solid front wall is separately fabricated and then joined to the peripheral case wall of another construction as, for example, disclosed in US. patents 4,154,166 and 4,175,444. There are also those in which the solid front wall is cast or molded integral with the peripheral wall as disclosed, for example, in US. patents 2,215,013 and 2,752,787. Whereas it has long been recognized that the aforementioned solid front gauge constructions have been comparatively costly to manufacture, it has not heretofore been known how to significantly reduce such costs.
Statement of Invention According to the present invention there is provided a solid front gauge case for a pressured gauge including an integral sheet metal construction of an annular outer wall, a solid front wall positioned integrally toward the front of the other wall in the diametral plan thereof with means to receive a closure in the rear able to afford relief of pressure from within. According to another aspect of the invention there is provided a method of forming a solid front gauge case for a pressure gauge which includes the steps of cutting a sheet metal blank of predetermined size, deforming the cutting into a cup-like configuration having an annular wall defining an internal cavity closed at one end with a wall and opened at the other end, and laterally deforming the end wall to a 121~878 displaced location internally toward the front of the annular wall and in the diametral plan thereof.
It can be seen, therefore, that the present invention relates to a novel solid front case construction therefore less costly to fabricate than similar type case constructions of the prior art. More specifically, this is achieved in accordance with the invention by means of a case formed of a cutout from a sheet metal stamping. After forming the cutout, it is deep drawn to a shape constituting an annular enclosure defining an internal cavity therein open at one end and closed by an end wall at the other end. By means of a reshaped die subsequently applied laterally against the exterior face of the end wall in a direction inward of the cavity, the wall is deformed to a predetermined reentrant recess inward of the enclosure to constitute the "solid front" of the case. On subsequently punching the necessary apertures for receipt of the operating mechanism and supplying a suitable rear enclosure, the case is completed and ready for use. By this relatively simple fabrication procedure a solid front gauge case is formed with all the attributes of more costly prior art constructions but at significantly less cost It is therefore an object of the invention to effect a novel solid front gauge case for a pressure gauge less costly to fabricate than heretofore.
It is a further object of the invention to provide a novel method for producing the gauge case of the previous object.
- pa -of:
lZ~387~3 It is a still further object of the invention to manufacture a pressure gauge with the case of the previous objects.
Brief Description of the Drawings Figs. 1 and 2 are sequential sectional views of a solid front gauge case formed in accordance with the invention;
Fig. 3 is a sectional elevation through a pressure gauge utilizing the gauge case hereof; and Fig. 4 is an alternative construction for the encircled portion of Fig. 3.
Referring now to Figs. 1 and 2 of the drawings, the gauge case hereof designated 10 is initially formed into the cup shaped arrangement of Fig. 1 by stamping and deep drawing a cutout from sheet metal to form an annular periphery 12 of dimension A and width D. Internally, there is defined a cavity 14 open at one end 16 and closed at the other end by an integral wall formation 18. With or without annealing, a force 20 from a die of predetermined shape is subsequently applied laterally against the outside face of wall 18 until a reentrant recess of dimension C and diameter B is formed as illustrated in Fig. 2, while concomitantly forming an annular rim 21 about the periphery. Preferably, dimension C
provides for a reentrant recess over about 85 Jo 97% of the internal diameter of peripheral wall 8. After punching openings 22 end 24 through walls 12 and 18, respectively, the case is in a completed condition with wall 18 defining a rear compartment 27 and a front compartment 34. The case is now ready to receive the operating mechanism and rear closure as will be described with respect to Fig. 3.
As illustrated in Fig. 3, case 10 houses a gauge mechanism 25 that includes a Bourbon tube 26 in the rear compartment 27 for connection to a socket 28 through which pressure to be measured is introduced as represented by arrow 29. In response to changing values of pressure 29, the Bourbon tube functions to drive a pointer 30 on a pointer shaft 32 opposite dial plate 38 in front compartment 34.
operating mechanism 25 may, for example, be of a type more completely disclosed in US. patent 4,237,738. A bushing 36 may optionally be provided secured in a press fit within 1~18878 center offset 37 of wall 18 for support of the pointer shaft 32 and dial plate 38 in alignment with aperture 24. For effecting a tight enclosure, aperture flange 32 is welded at 33 to socket 28.
An annular grooved gasket 40 supporting window 42 is frictionally inserted in a force fit into compartment 34 about rip 21 to effect the enclosure therefore A suitable rear closure assembly 44 affording relief in the event of overpricer within compartment 27 is provided at the rear of case 10 and may, for example, be of a type disclosed in co-pending kidney p~tsn' aprlicatioII 449,172~ filed March 8, 19 84 . and entitled "Temperature Compensator for Liquid Filled Pressure Gauge". As illustrated in Fig. 4, gasket 40 is further secured by a mechanical force afforded by metallic trim ring 46.
By the above description there is disclosed a novel solid front case construction for a pressure gauge having a front wall fabricated of sheet metal integral with the annular sidewall. Typical sheet-metal constructions suitable for these purposes would be of thickness on the order of about 1/2-2 millimeters, and could comprise by way of example stainless steel, galvanized steel, brass, aluminum, etc.
Being formed in this manner, case fabrication represents the height of simplicity for forming a solid front gauge case, and from which it can be appreciated that considerable cost savings are realized as compared to similar purpose construe-lions of the prior art.
Since many changes could be made in the above construe-lion, and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the drawings and specification shall be interpreted as illustra-live and not in a limiting sense.
A common form of case construction for a pressure gauge comprises the "solid front" type in which an intermediate wall separates the case into front and rear compartments.
In the usual arrangement, the front compartment contains the indicating mechanism, whereas the pressurized element is contained in the rear compartment such that should the element incur failure from overpricer or whatever, relief is afforded rearward rather than forward of the case. Con-struction of the solid front gauge case is largely governed by the American National Standard Institute (ANSI) Standard B40.1-1974, Section 3.1.1.2.
Jo 12~8878 Typical prior art solid front gauge case constructions as shown by the patent literature include those in which the solid front wall is separately fabricated and then joined to the peripheral case wall of another construction as, for example, disclosed in US. patents 4,154,166 and 4,175,444. There are also those in which the solid front wall is cast or molded integral with the peripheral wall as disclosed, for example, in US. patents 2,215,013 and 2,752,787. Whereas it has long been recognized that the aforementioned solid front gauge constructions have been comparatively costly to manufacture, it has not heretofore been known how to significantly reduce such costs.
Statement of Invention According to the present invention there is provided a solid front gauge case for a pressured gauge including an integral sheet metal construction of an annular outer wall, a solid front wall positioned integrally toward the front of the other wall in the diametral plan thereof with means to receive a closure in the rear able to afford relief of pressure from within. According to another aspect of the invention there is provided a method of forming a solid front gauge case for a pressure gauge which includes the steps of cutting a sheet metal blank of predetermined size, deforming the cutting into a cup-like configuration having an annular wall defining an internal cavity closed at one end with a wall and opened at the other end, and laterally deforming the end wall to a 121~878 displaced location internally toward the front of the annular wall and in the diametral plan thereof.
It can be seen, therefore, that the present invention relates to a novel solid front case construction therefore less costly to fabricate than similar type case constructions of the prior art. More specifically, this is achieved in accordance with the invention by means of a case formed of a cutout from a sheet metal stamping. After forming the cutout, it is deep drawn to a shape constituting an annular enclosure defining an internal cavity therein open at one end and closed by an end wall at the other end. By means of a reshaped die subsequently applied laterally against the exterior face of the end wall in a direction inward of the cavity, the wall is deformed to a predetermined reentrant recess inward of the enclosure to constitute the "solid front" of the case. On subsequently punching the necessary apertures for receipt of the operating mechanism and supplying a suitable rear enclosure, the case is completed and ready for use. By this relatively simple fabrication procedure a solid front gauge case is formed with all the attributes of more costly prior art constructions but at significantly less cost It is therefore an object of the invention to effect a novel solid front gauge case for a pressure gauge less costly to fabricate than heretofore.
It is a further object of the invention to provide a novel method for producing the gauge case of the previous object.
- pa -of:
lZ~387~3 It is a still further object of the invention to manufacture a pressure gauge with the case of the previous objects.
Brief Description of the Drawings Figs. 1 and 2 are sequential sectional views of a solid front gauge case formed in accordance with the invention;
Fig. 3 is a sectional elevation through a pressure gauge utilizing the gauge case hereof; and Fig. 4 is an alternative construction for the encircled portion of Fig. 3.
Referring now to Figs. 1 and 2 of the drawings, the gauge case hereof designated 10 is initially formed into the cup shaped arrangement of Fig. 1 by stamping and deep drawing a cutout from sheet metal to form an annular periphery 12 of dimension A and width D. Internally, there is defined a cavity 14 open at one end 16 and closed at the other end by an integral wall formation 18. With or without annealing, a force 20 from a die of predetermined shape is subsequently applied laterally against the outside face of wall 18 until a reentrant recess of dimension C and diameter B is formed as illustrated in Fig. 2, while concomitantly forming an annular rim 21 about the periphery. Preferably, dimension C
provides for a reentrant recess over about 85 Jo 97% of the internal diameter of peripheral wall 8. After punching openings 22 end 24 through walls 12 and 18, respectively, the case is in a completed condition with wall 18 defining a rear compartment 27 and a front compartment 34. The case is now ready to receive the operating mechanism and rear closure as will be described with respect to Fig. 3.
As illustrated in Fig. 3, case 10 houses a gauge mechanism 25 that includes a Bourbon tube 26 in the rear compartment 27 for connection to a socket 28 through which pressure to be measured is introduced as represented by arrow 29. In response to changing values of pressure 29, the Bourbon tube functions to drive a pointer 30 on a pointer shaft 32 opposite dial plate 38 in front compartment 34.
operating mechanism 25 may, for example, be of a type more completely disclosed in US. patent 4,237,738. A bushing 36 may optionally be provided secured in a press fit within 1~18878 center offset 37 of wall 18 for support of the pointer shaft 32 and dial plate 38 in alignment with aperture 24. For effecting a tight enclosure, aperture flange 32 is welded at 33 to socket 28.
An annular grooved gasket 40 supporting window 42 is frictionally inserted in a force fit into compartment 34 about rip 21 to effect the enclosure therefore A suitable rear closure assembly 44 affording relief in the event of overpricer within compartment 27 is provided at the rear of case 10 and may, for example, be of a type disclosed in co-pending kidney p~tsn' aprlicatioII 449,172~ filed March 8, 19 84 . and entitled "Temperature Compensator for Liquid Filled Pressure Gauge". As illustrated in Fig. 4, gasket 40 is further secured by a mechanical force afforded by metallic trim ring 46.
By the above description there is disclosed a novel solid front case construction for a pressure gauge having a front wall fabricated of sheet metal integral with the annular sidewall. Typical sheet-metal constructions suitable for these purposes would be of thickness on the order of about 1/2-2 millimeters, and could comprise by way of example stainless steel, galvanized steel, brass, aluminum, etc.
Being formed in this manner, case fabrication represents the height of simplicity for forming a solid front gauge case, and from which it can be appreciated that considerable cost savings are realized as compared to similar purpose construe-lions of the prior art.
Since many changes could be made in the above construe-lion, and many apparently widely different embodiments of this invention could be made without departing from the scope thereof, it is intended that all matter contained in the drawings and specification shall be interpreted as illustra-live and not in a limiting sense.
Claims (14)
1. A solid front gauge case for a pressure gauge comprising an integral sheet metal construction of an annular outer wall, a solid front wall positioned internally toward the front of said outer wall in the diametral plane thereof, and means to receive a closure in the rear able to afford relief of overpressure from within.
2. A solid front gauge case according to claim 1 in which said walls are joined by an annular flange extending peripherally about the front face of said outer wall.
3. A solid front gauge case according to claim 2 in which said solid front wall is of a diameter in the range of about 85-97 percent of the internal diameter of said annular wall.
4. A solid front gauge case according to claim 3 in which said sheet metal is of a composition selected from a group consisting of stainless steel, brass, aluminum or galvanized steel.
5. In a pressure gauge including a pressure sensitive element operably responsive to changes in fluid pressure to which it is connected and an indicator mechanism dis-placed by operation of said element for providing an indica-tion of pressure value of the connected fluid, a solid front gauge case for housing said element and said indicating mechanism comprising:
a) sheet metal construction of an annular outer wall;
b) a solid front wall of sheet metal construc-tion integral with said annular outer wall and positioned internally of said outer wall between said element and said indicating mechanism in the diametral plane of said outer wall; and c) a closure for the rear of said annular outer wall affording relief of overpressure from within said case.
a) sheet metal construction of an annular outer wall;
b) a solid front wall of sheet metal construc-tion integral with said annular outer wall and positioned internally of said outer wall between said element and said indicating mechanism in the diametral plane of said outer wall; and c) a closure for the rear of said annular outer wall affording relief of overpressure from within said case.
6. In a pressure gauge according to claim 5 in which the walls of said case are joined by an annular flange extending peripherally about the front face of said outer wall.
7. In a pressure gauge according to claim 6 in which said solid front case wall is of a diameter in the range of about 85-97 percent of the internal diameter of said annular case wall.
8. In a pressure gauge according to claim 7 in which said sheet metal of said case construction is of a composition selected from a group consisting of stainless steel, brass, aluminum or galvanized steel.
9. The method of forming a solid front gauge case for a pressure gauge including the steps of:
a) cutting a sheet metal blank of predetermined size;
b) deforming the cutting into a cup-like configuration having an annular wall defining an internal cavity closed at one end with a wall and open at the other end; and c) laterally deforming said end wall to a displaced location internally toward the front of said annular wall and in the diametral plane thereof.
a) cutting a sheet metal blank of predetermined size;
b) deforming the cutting into a cup-like configuration having an annular wall defining an internal cavity closed at one end with a wall and open at the other end; and c) laterally deforming said end wall to a displaced location internally toward the front of said annular wall and in the diametral plane thereof.
10. The method of claim 9 in which the step of deform-ing said end wall concomitantly forms an annular flange extending peripherally about the front face of said annular wall joining said end wall with said annular wall.
11. The method according to claim 10 in which said sheet metal is of a composition selected from a group con-sitting of stainless steel, brass, aluminum or galvanized steel.
12. In a pressure gauge including a pressure sensitive element operably responsive to changes in fluid pressure to which it is connected, an indicator mechanism displaced by operation of said element for providing an indication of pressure value of the connected fluid and a transparent crystal supported in a superposed protective relation to said indicator mechanism, a solid front gauge case for housing said element and said indicating mechanism comprising:
(a) sheet metal construction of an annular outer wall;
(b) a solid front wall of sheet metal construction integral with said annular outer wall and positioned internally of said outer wall between said element and said indicator mechanism in the diametral plane of said outer wall;
(c) an annular flange defined in a joining relation between said annular outer wall and said solid front wall and extending peripherally about the front face of said outer wall for providing the case support for said crystal;
(d) said annular outer wall having an axial extent terminating rearwardly of said element so as to define by its internal diameter a rear opening thereat in which to receive a closure element; and (e) a closure element for the rear of said annular outer wall affording relief of overpressure from within said case.
(a) sheet metal construction of an annular outer wall;
(b) a solid front wall of sheet metal construction integral with said annular outer wall and positioned internally of said outer wall between said element and said indicator mechanism in the diametral plane of said outer wall;
(c) an annular flange defined in a joining relation between said annular outer wall and said solid front wall and extending peripherally about the front face of said outer wall for providing the case support for said crystal;
(d) said annular outer wall having an axial extent terminating rearwardly of said element so as to define by its internal diameter a rear opening thereat in which to receive a closure element; and (e) a closure element for the rear of said annular outer wall affording relief of overpressure from within said case.
13. In a pressure gauge according to claim 12 in which said solid front case wall is of a diameter in the range of about 85-97 percent of the internal diameter of said annular case wall.
14. In a pressure gauge according to claim 13 in which said sheet metal of said case construction is of a composition selected from a group consisting of stainless steel, brass, aluminum or galvanized steel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US48592083A | 1983-04-18 | 1983-04-18 | |
| US485,920 | 1983-04-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1218878A true CA1218878A (en) | 1987-03-10 |
Family
ID=23929943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000451700A Expired CA1218878A (en) | 1983-04-18 | 1984-04-11 | Integral solid front gauge for a pressure gauge |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS59198335A (en) |
| CA (1) | CA1218878A (en) |
| DE (1) | DE3414702A1 (en) |
| FR (1) | FR2544494B1 (en) |
| GB (1) | GB2139759B (en) |
| IT (1) | IT1180693B (en) |
| NL (1) | NL8401154A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE8410848U1 (en) * | 1984-04-06 | 1984-08-02 | Alexander Wiegand Gmbh U. Co Armaturen- U. Manometerfabrik, 8763 Klingenberg | PLASTIC MANOMETER HOUSING |
| US4838090A (en) * | 1988-09-30 | 1989-06-13 | Dwyer Instruments, Inc. | Multicoil bourdon tube type pressure gauge |
| AUPO010296A0 (en) * | 1996-05-27 | 1996-06-20 | Southcorp Whitegoods Pty Ltd | An improved washing machine |
| CN102706488A (en) * | 2012-05-04 | 2012-10-03 | 昆山沪光汽车电器有限公司 | Tension detecting box |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2693896A (en) * | 1950-03-10 | 1954-11-09 | Acragage Corp | Pressure gauge case and closure |
| US3693828A (en) * | 1970-07-22 | 1972-09-26 | Crown Cork & Seal Co | Seamless steel containers |
| US3935955A (en) * | 1975-02-13 | 1976-02-03 | Continental Can Company, Inc. | Container bottom structure |
| CA1093987A (en) * | 1976-07-29 | 1981-01-20 | Harry W. Lee, Jr. | Container |
| US4065951A (en) * | 1976-11-03 | 1978-01-03 | National Can Corporation | Split punch for drawing and ironing containers |
| US4333348A (en) * | 1978-08-18 | 1982-06-08 | Alexander Wiegand Gmbh U. Co. | Liquid-filled pressure gauge |
| GB2052062A (en) * | 1979-06-08 | 1981-01-21 | Wilkinson J | Pressure Gauge |
-
1984
- 1984-04-10 IT IT48008/84A patent/IT1180693B/en active
- 1984-04-11 CA CA000451700A patent/CA1218878A/en not_active Expired
- 1984-04-11 NL NL8401154A patent/NL8401154A/en not_active Application Discontinuation
- 1984-04-16 GB GB08409860A patent/GB2139759B/en not_active Expired
- 1984-04-16 FR FR8405978A patent/FR2544494B1/en not_active Expired
- 1984-04-16 DE DE19843414702 patent/DE3414702A1/en not_active Withdrawn
- 1984-04-18 JP JP59078305A patent/JPS59198335A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| FR2544494A1 (en) | 1984-10-19 |
| IT8448008A1 (en) | 1985-10-10 |
| GB2139759B (en) | 1987-01-14 |
| NL8401154A (en) | 1984-11-16 |
| IT1180693B (en) | 1987-09-23 |
| JPS59198335A (en) | 1984-11-10 |
| GB2139759A (en) | 1984-11-14 |
| FR2544494B1 (en) | 1986-09-26 |
| IT8448008A0 (en) | 1984-04-10 |
| DE3414702A1 (en) | 1984-12-06 |
| GB8409860D0 (en) | 1984-05-23 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |