GB2189616A - Engineer's protractor - Google Patents
Engineer's protractor Download PDFInfo
- Publication number
- GB2189616A GB2189616A GB08603188A GB8603188A GB2189616A GB 2189616 A GB2189616 A GB 2189616A GB 08603188 A GB08603188 A GB 08603188A GB 8603188 A GB8603188 A GB 8603188A GB 2189616 A GB2189616 A GB 2189616A
- Authority
- GB
- United Kingdom
- Prior art keywords
- protractor
- analog
- transmitter
- analog transmitter
- give
- 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- Withdrawn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
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/56—Gauges for measuring angles or tapers, e.g. conical calipers
- G01B3/563—Protractors
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Digital engineers protractor to measure angles of machine tools and give a value of these angles comprises an analog transmitter (1) to measure the positional movement of the protractor. A signal from the transmitter (1) is picked up by a receiver (2) and angles are measured off by an adjustable sliding rule against the side of the protractor (3), a digital display (10) is provided. <IMAGE>
Description
SPECIFICATION
Engineer's protractor
TECHNICAL FIELD
This invention relates to an engineer's protractor.
BACKGROUND
Engineer's protractor's come in a combination of types from bevel protractors to combination sets all of which are used for measuring angles.
However, these protractors are not very acurate and are very difficult to read because the scale has to be etched so fine.
ESSENTIAL TECHNICAL FEATURES PREVIOUS PROTRACTOR
According to the present inventions it enables angles to be measured with a fine adjustment on the better makes, a specific embodiment of the invention will now be described by way of example with reference to the accompanying drawings. This is also a mechanical device. I have designed a way in which angles can be measured and can be transferred into a digital readout.
Figure 1 shows in perspective the digital engineer's protractor detailing the components.
Fig. 1, No 1:- Analogue transmitter
Fig. 1, No 2:- Emf transmitter and analog receiver.
Fig. 1, No 3:- Slide-rule.
Fig. 1, No 6:- Spring-ring and seal.
Fig. 1, No 7:- Locking-screw.
Fig. 1, No 8:- Fine adjustment screw.
Fig. 1, No 10:- Digital display
Figure 2 shows a side view of the protractor.
Fig. 2, No 1:- Analogue transmitter
Fig. 2, No 2:- Emf transmitter and analog receiver
Fig. 2, No 4:- Circular base
Fig. 2, No 9:- Top (Lid)
Figure 3 shows an end view of the head of the protractor
Fig. 3, No 3:- Slide-rule-arm.
Fig. 3, No 4:- Circular base
Fig. 3, No 5:- Rollers
Figure 4 shows a detailed drawing of the analog transmitter
Fig. 4, No 1:- Spiral resister
Fig. 4, No 2:- Insulator
Fig. 4, No 3:- Conductor
Fig. 4, No 4:- Centre locating whole.
Fig. 4, No 5:- Whole insulator
Fig. 4, No 6:- Analog receiver head
Fig. 4, No 7:- Analog calibrator
Figure 5 shows a side view of the analog transmitter
Fig. 5, No 1:- Analog resister
Fig. 5, No 2:- Insulators
Fig. 5, No 3:- Conductor
Fig. 5, No 4:- Emf-in head
Fig. 5, No 5:- Analog signal receiver head
Figure 6 a diagram of the electronic circuit
Fig. 6, No 1:- Analog transmitter
Fig. 6, No 2:- Analog to digital converter
Fig. 6, No 4:- Eprom
Fig. 6, No 5:- Counters
Fig. 6, No 7:- Display
Figure 7 micrometer and depth MIC showing analog transmitter (POT)
Fig. 7, No 1:- Analog transmitter
Fig. 7, No 2:- Emf transmitter and analog receiver
Fig. 7, No 3:- Analog transmitter
Fig. 7, No 4:- Emf transmitter and analog receiver
Figure 8 Viernier showing analog transmitter
Fig. 8, No 1:- Analog transmitter
Fig. 8, No 2:- Emf transmitter and analog receiver.
Referring to the drawings the digital protractor comprises of an analog transmitter set in the head of the protractor this analog transmitter pivots at its centre. (Fig. 1, No: 1). The signal is then picked up by the receiver. (Fig. 1, No: 2). The angles are measured off by the adjustable sliding-rule against the side of the protractor (Fig. 1, No: 3). The slide-ruie and analog transmitter are fixed to a circular base (Fig. 2, No: 4). This is all then fixed onto rollers (Fig. 3, No: 5. In the head there is a spring-ring and seal connecting to the slide-rule (Fig. 1, No: 6).
(Fig. 1, No: 7) Locking-screw
This locks onto the spring-ring and seal which serves the purpose of locking the slide-rule and analog transmitter to a fixed angle setting.
(Fig. 1, No: 8) Fine adjustment screw
This works off the spring-ring and seal to give very fine adjustment to the slide-rule and analog transmitter (Fig. 2, No: 9) Top of the electronic's compartment (Fig. 4, No: 2) Insulator
Insulator to a given size to which a calculated error of rotation can be measured in the resistance.
Figure 9 shows a 360 analogue transmitter
Fig. 9, No: 1- Analogue calibrator
Fig. 9, No: 2- Analogue calibrator housing
Fig. 9, No: 3- Emf in for calibrator
ANALOGUE TRANSMITTER
When new, the contact point will be very fine,
contact point and contact point and accumulative resistance Xl L1 2 =C.S.A.
Resistance=C.S.A. (cross-sectional area)
For example X1,X2,h,1, will all be different values at any given point. Ohms law will then give different values of resistance.
Being that this works to ohms law it is possible to put this information into then eprom and calculate exact position.
If a known position is given e.g. 0 degrees, when new C.S.A. is known, the resistance is known therefore contact wear can also be calculated.
when new when worn
When worn the contact area at 0 degrees will be greater, and there the centre will be calculated, and exact position known.
AUTO CALIBRATION
0-180 degrees and 0-360 degrees
1) When new R1=resistance to ratio of X resistance.
2) When worn R2=resistance+wear=drop in R also resistance of X will drop
3) Distance at 0 degrees will be; R1-R2=W 4) So therefore being ratio of R1 to R2 to be constant no matter what position then wear and position can be calculated.
5) This will mean that if both waveforms are inputed to a eprom, exact position can be calculated at all times.
NOTE: R2 will not wear because this is a static component.
e.g. d=DISTANCE
Claims (6)
1. Analog transmitter will give an analog signal from a minimum resistance to a maximum resistance then to minimum, in a 360 degree cycle. (see Fig. 4 and 5)
2. This analog transmitter can be used for rotary or uncoiled for linear functions to give an analog signal in any device, wether this be micrometer, depth mic, vierniers, or any other design of protractor, the signal can be converted to incremental or absolute values of measurement
3. This analog transmitter is a absolute positional device in a three dimensional plane, and can distinguish left to right, the application of the principle can be put in a magnetical, optical, voltage form.
4. The protractor can measure angles from the information resieved from the analog transmitter. This information is converted into a digital output then to a display.
5. This analog transmitter can triangulate error. Plus Claims 3 the position of the emitters are important to the fact to give a pyramid effect. Plus Claims 2
6. The digital engineers protractor is designed to measure angles of machine tools. Plus
Claim 4.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08603188A GB2189616A (en) | 1986-02-10 | 1986-02-10 | Engineer's protractor |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08603188A GB2189616A (en) | 1986-02-10 | 1986-02-10 | Engineer's protractor |
Publications (2)
Publication Number | Publication Date |
---|---|
GB8603188D0 GB8603188D0 (en) | 1986-03-19 |
GB2189616A true GB2189616A (en) | 1987-10-28 |
Family
ID=10592778
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08603188A Withdrawn GB2189616A (en) | 1986-02-10 | 1986-02-10 | Engineer's protractor |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB2189616A (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1438063A (en) * | 1973-01-31 | 1976-06-03 | Mutoh Industry Lte | Drawing apparatus |
GB1515713A (en) * | 1974-08-19 | 1978-06-28 | United Technologies Corp | Protractor with digital readout |
GB1545414A (en) * | 1976-09-17 | 1979-05-10 | Mutoh Ind Ltd | Parallel ruler device |
GB2114759A (en) * | 1982-02-08 | 1983-08-24 | Gerber Scient Products Inc | Automated measuring scale |
US4492031A (en) * | 1981-04-21 | 1985-01-08 | Asahi Seimitsu Kabushiki Kaisha | Vernier device of the digital display type for a universal parallel ruler |
-
1986
- 1986-02-10 GB GB08603188A patent/GB2189616A/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1438063A (en) * | 1973-01-31 | 1976-06-03 | Mutoh Industry Lte | Drawing apparatus |
GB1515713A (en) * | 1974-08-19 | 1978-06-28 | United Technologies Corp | Protractor with digital readout |
GB1545414A (en) * | 1976-09-17 | 1979-05-10 | Mutoh Ind Ltd | Parallel ruler device |
US4492031A (en) * | 1981-04-21 | 1985-01-08 | Asahi Seimitsu Kabushiki Kaisha | Vernier device of the digital display type for a universal parallel ruler |
GB2114759A (en) * | 1982-02-08 | 1983-08-24 | Gerber Scient Products Inc | Automated measuring scale |
Also Published As
Publication number | Publication date |
---|---|
GB8603188D0 (en) | 1986-03-19 |
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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) |