GB2267347A - Digital pressure gauge - Google Patents
Digital pressure gauge Download PDFInfo
- Publication number
- GB2267347A GB2267347A GB9210657A GB9210657A GB2267347A GB 2267347 A GB2267347 A GB 2267347A GB 9210657 A GB9210657 A GB 9210657A GB 9210657 A GB9210657 A GB 9210657A GB 2267347 A GB2267347 A GB 2267347A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure gauge
- casing
- sensing member
- digital
- digital pressure
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L17/00—Devices or apparatus for measuring tyre pressure or the pressure in other inflated bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/02—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using mechanical means
- G01D5/04—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using mechanical means using levers; using cams; using gearing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/16—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying resistance
-
- 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
- G01L19/0007—Fluidic connecting means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0026—Transmitting or indicating the displacement of flexible, deformable tubes by electric, electromechanical, magnetic or electromagnetic means
- G01L9/0027—Transmitting or indicating the displacement of flexible, deformable tubes by electric, electromechanical, magnetic or electromagnetic means using variations in ohmic resistance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/0033—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means
- G01L9/0035—Transmitting or indicating the displacement of bellows by electric, electromechanical, magnetic, or electromagnetic means using variations in ohmic resistance
Abstract
A digital pressure gauge includes a casing (2) having a sensing member (6) which responds when force is applied thereto, e.g. by means of a Bourdon tube 4 and lever arm 83, and a digital display member (7) electrically connected to circuitry receiving the output signal from the sensing member (6). In alternative embodiments the force is applied via a hooked arm (80, Figs, 8, 9 not shown) or by a capsule and rod arrangement (Fig. 11). <IMAGE>
Description
DIGITAL PRESSURE GAUGE
This invention relates to a pressure gauge, more particularly to one which shows a measured pressure in digital numbers.
Referring to Figure 1, a Bourdon pressure gauge (1) is shown to comprise a C-shaped pipe (11) of an oval crosssection (see in Figure 3) through which a pressurized fluid from a fluid inlet (10) can flow. When the pressure inside the pipe (11) is increased, the C-shaped pipe (11) tends to become circular, causing the pipe (11) to straighten, as shown in Figure 2. The sealed inner end portion (110) of the pipe (11) will impel an end of a connecting rod (121).
The other end (124) of the connecting rod (121) in turn rotates a sector gear (122) about a pivot pin (125) so that an indicating needle (102) is rotated by meshing the teeth (123) of the sector gear (122) with a gear (103) of the indicating needle (102). Since the upper casing of the
Bourbon pressure gauge has a marking scale (104), the needle (102) will point to the corresponding mark in response to the applied weight.
A drawback of the above-mentioned pressure gauge is that when the indicating needle (102) lies between two marks of the scale, one can not tell the precise weight of an object. When measuring an object, the value of which must be known precisely, such a pressure gauge is not desirable.
Therefore, a main object of the present invention is to provide a pressure gauge which shows the measured weight with digital numbers so that one can know the weight precisely.
A Bourdon pressure gauge of the present invention includes a casing having a C-shaped pipe provided in the casing. The pipe has an inlet end extending out from the casing through which a pressurized fluid can be inserted into the same. A sealed end of the pipe is connected to an end of a impelling arm in the casing. The casing further includes a weight sensing member provided therein and electrically connected to a liquid crystal display member provided on an upper portion of the casing. The weight sensing member can convert an applied force to an electrical signal which is transmitted through an electrical circuit to the LCD in digital number.
Other features and advantages of the present invention will become more apparent in the following detailed description, including drawings, all of which show a nonlimiting form of the present invention, and in which:
Figure 1 shows a prior art pressure gauge, a section of which is partially exploded;
Figure 2 illustrates a C-shaped pipe employed in the pressure gauge of Figure 1 with the dotted lines showing the configuration of when being straightened;
Figure 3 shows a cross section view of a C-shaped pipe employed in the pressure gauge of Figure 1;
Figure 4 shows an exploded view of a pressure gauge of the present invention;
Figure 5 shows an exploded view of a section of the pressure gauge of the present invention;
Figure 6 shows an integrated circuit of a weight sensing member of the pressure gauge of the present invention;
Figures 7(A) and 7(B) show the table of a display member of the pressure gauge of the present invention;
Figure 8 shows a second preferred embodiment of the pressure gauge of the present invention;
Figure 9 shows a sectional exploded view of the pressure gauge of the present invention;
Figure 10 shows a third preferred embodiment of the pressure gauge of the present invention; and
Figure 11 shows a fourth preferred embodiment of the pressure gauge of the present invention.
Referring to Figures 4 and 5, a digital pressure gauge of the present invention is shown to comprise a casing (2), a base support (3), a C-shaped pipe (4), a U-shaped fixing seat (5), a weight sensing member (6), a display member (7) and an impelling mechanism (8).
The casing (2) includes an upper half (22) with a transparent cover (70) and a lower half (21) with a substantial depth. The base support is (3) is fixedly secured in the lower half (21) with a section (31) extending out from the lower half. The extending section of the base support (3) has a blind bore (33) with an inlet (32) and an external thread (35) which can be threaded to a valve of a tire, a pressure of which is to be measured.
An open end (42) of the C-shaped pipe (4) is connected to the base support (3) and in communication with the blind bore (33). A sealed end of the C-shaped pipe (4) is connected to an end of a connecting rod (411).
The U-shaped fixing seat (5) is integrally formed with an uppermost section of the base support (3) and has a receiving space (51) for receiving a weight sensing member (6) securely therein by a screw means. The weight sensing member (6) is a thick-film resistor including a resistor layer (60) and a sensing face (61).
The display member (7) is a liquid crystal display electrically connected to the integrated circuit (61).
The impelling mechanism (8) includes two supports (81) fixedly secured on both sides of the base support (3), a transverse rod (82) provided on the two supports and a lever arm (83) rotatably attached to the transverse rod (82). The lever arm (83) has a first end (832) in contact with the resistor layer (60) and a second end (831) movably connected to another end of the connecting rod (411).
When a pressurized fluid is inserted into the C-shaped pipe (4) through the inlet (32) of the base support (3), the pipe (4) tends to become straightened, which action will impel the lever arm (83) about the transverse rod (82) thereby imparting a pressure on the weight sensing member (6). The weight sensing member (6) will generate a signal to the convertor I.C. The annolog signal received by the convertor I.C. is converted into a digital signal. By using a database routine of the convertor I.C., the digital signal is converted into a numerical display signal which is sent to the LCD.
A contact switch may be provided in combination with the Bourdon's tube. When a pressure (P) is applied to the
Bourdon's tube, it expands to actuate the contact switch.
The contact switch can be therefore serve as a power supply for activating the I.C. Referring to Figures 6 and 7, the
I.C. is provided with two selecting pins (SLE1, SLEO) used in combination with a control circuit to selectively set the units (PSI, KPA, KG and BAR) of the pressure gauge.
The I.C. can also be provided with two controlled pins (RSl, RSO) which are used in combination with the control circuit to set the decimal point of the display member on the LCD.
The digital pressure gauge of the present invention has the following advantages:
(1) One can easily read the measured weight directly on the display member. An inclination of the viewing point in relation to the indicating needle in the prior art pressure gauge often leads to error in reading.
(2) The present invention can provide a wide measuring range since the weight sensing member (6) can detect a weight of 0 to 1000 psi. (The prior art Bourdon gauge can only detect a weight of 0 to 300 psi).
Referring to Figures 8 and 9, a second preferred embodiment of the pressure gauge of the present invention is shown with the difference that the connecting rod (80) has a hook portion which is disposed in a pressing position on the weight sensing member (6). When a pressurized fluid is inserted into the C-shaped pipe (4) through the inlet (32) of the base support (3), the impulse is directly received on the resistor layer (60). Since the sensing member is electrically connected to the LCD as in the previous preferred embodiment, the weight will appear in numerical digital numbers on the display member (7). It is important to note that the construction of the present pressure gauge is simple but that the measurement provided accordingly is accurate and precise.
Referring to Figure 10, the inlet (40) of the pressure gauge of the present invention can also extend from the casing through the bottom of the lower half of the casing but the feature and the object are the same as in the previous embodiment.
Referring to Figure 11, another preferred embodiment of the present invention is shown in use as a blood pressure gauge. As illustrated, it includes a casing (1) confining a receiving space (10) therein with an open end (11). A weight sensing member (3) is disposed in a clearance (121) defined by two supports (12) and electrically connected to a display member (LCD). The open end (11) is threadedly sealed by a seal member (4) through which a valve (40) passes and connects to a diaphragm (41) in the casing (1). The diaphragm (41) is in contact with the weight sensing member (3) through an insulating rod (42). When the pressure is increased through the valve (40) the diaphragm (41) vibrates so as to push the insulating rod (42), producing a result the same as those previous embodiment.
Claims (6)
1. A digital pressure gauge, comprising:
a casing having a weight sensing member provided therein and a display member electrically connected to said weight sensing member, said display member displaying a weight sensed by said sensing member in digital numbers; and
air pressure sensitive means provided in said casing and connected to said weight sensing member via a connecting means, having an inlet extending out from said casing, said air pressure sensitive means being responsive to pressure flowing therein through said inlet thereof.
2. A digital pressure gauge as claimed in Claim 1, wherein said air pressure sensitive means is a Bourdon tube disposed in said casing and having a sealed end and an open end extending out from said casing.
3. A digital pressure gauge as claimed in Claim 1, wherein said air pressure sensitive means is a diaphragm.
4. A digital pressure gauge as claimed in Claim 1, wherein said weight sensing member is a thick-film resistor.
5. A digital pressure gauge as claimed in Claim 1, wherein said display member is a liquid crystal display.
6. A digital pressure gauge substantially as described heretofore with reference to Figures 4 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9210657A GB2267347A (en) | 1992-05-19 | 1992-05-19 | Digital pressure gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9210657A GB2267347A (en) | 1992-05-19 | 1992-05-19 | Digital pressure gauge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9210657D0 GB9210657D0 (en) | 1992-07-01 |
| GB2267347A true GB2267347A (en) | 1993-12-01 |
Family
ID=10715714
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9210657A Withdrawn GB2267347A (en) | 1992-05-19 | 1992-05-19 | Digital pressure gauge |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2267347A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1169511A (en) * | 1966-01-13 | 1969-11-05 | K D G Instr Ltd | Improvements in and relating to Electrical Instruments. |
| GB2008255A (en) * | 1977-11-09 | 1979-05-31 | Scovill Manufacturing Co | Digital Readout Gauge |
| GB2049942A (en) * | 1979-06-07 | 1980-12-31 | Matsushita Electric Works Ltd | Pressure transducer |
| GB2169411A (en) * | 1984-12-04 | 1986-07-09 | Albert Raymond Jordan | Programmable digital display tyre pressure gauge |
| US4748845A (en) * | 1986-05-19 | 1988-06-07 | Neotech Industries, Inc. | Tire pressure gauge |
| US4998438A (en) * | 1990-05-22 | 1991-03-12 | Martin Jerry L | Digital air pressure gauge and inflation device |
-
1992
- 1992-05-19 GB GB9210657A patent/GB2267347A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1169511A (en) * | 1966-01-13 | 1969-11-05 | K D G Instr Ltd | Improvements in and relating to Electrical Instruments. |
| GB2008255A (en) * | 1977-11-09 | 1979-05-31 | Scovill Manufacturing Co | Digital Readout Gauge |
| GB2049942A (en) * | 1979-06-07 | 1980-12-31 | Matsushita Electric Works Ltd | Pressure transducer |
| GB2169411A (en) * | 1984-12-04 | 1986-07-09 | Albert Raymond Jordan | Programmable digital display tyre pressure gauge |
| US4748845A (en) * | 1986-05-19 | 1988-06-07 | Neotech Industries, Inc. | Tire pressure gauge |
| US4998438A (en) * | 1990-05-22 | 1991-03-12 | Martin Jerry L | Digital air pressure gauge and inflation device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9210657D0 (en) | 1992-07-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |