GB1530141A - Structural displacement monitor - Google Patents
Structural displacement monitorInfo
- Publication number
- GB1530141A GB1530141A GB1020975A GB1020975A GB1530141A GB 1530141 A GB1530141 A GB 1530141A GB 1020975 A GB1020975 A GB 1020975A GB 1020975 A GB1020975 A GB 1020975A GB 1530141 A GB1530141 A GB 1530141A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plate
- displacement monitor
- cracking
- march
- pin
- 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
- 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
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
1530141 Displacement monitor NATIONAL RESEARCH DEVELOPMENT CORP. 11 March 1976 [12 March 1975] 10209/75 Headings G1M and G1N A displacement monitor has a frangible detector element 22, which is a glass strip with a conductive coating 36, bridging the gap between two heavy metal plates 38, 40 with pegs 42 which engage the ends of the strip when the plates are moved apart to cause it to fracture at a predetermined relative displacement of the structures in which pins 50, 52 are secured. Pin 50 locates the plate 40 at a reference position of one of the structures. The other pin 52 provides a lost motion linkage with slot 48 to the plate 38. The amount of lost motion is pre-set by means of nuts 62 on screwthreaded rods 58 carrying a stop 54. A notch 34 provides a consistent starting point for cracking of the plate under tension. As a result point 78 rises in potential and a voltage-responsive device 76 operates an indicator or alarm. A failure in the circuit prior to cracking of the element is signalled by extinguishing of the lamp 80. Several monitors may be connected in a series circuit from a station 70 with a Zener diode having a different characteristic across each element whereby the foiled element may be identified from the volt drop. Resistors of different values may replace the diodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1020975A GB1530141A (en) | 1976-03-11 | 1976-03-11 | Structural displacement monitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1020975A GB1530141A (en) | 1976-03-11 | 1976-03-11 | Structural displacement monitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1530141A true GB1530141A (en) | 1978-10-25 |
Family
ID=9963604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1020975A Expired GB1530141A (en) | 1976-03-11 | 1976-03-11 | Structural displacement monitor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1530141A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112687082A (en) * | 2020-12-31 | 2021-04-20 | 云南省建筑科学研究院 | Concrete crack remote monitoring device |
-
1976
- 1976-03-11 GB GB1020975A patent/GB1530141A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112687082A (en) * | 2020-12-31 | 2021-04-20 | 云南省建筑科学研究院 | Concrete crack remote monitoring device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2502702A1 (en) | DETECTOR | |
| ES533872A0 (en) | A METHOD AND A DEVICE TO MONITOR THE PRODUCTION OF AN EVENT AND TO DETECT AND OBTAIN INFORMATION ON THE EVENT WHEN IT HAPPENS. | |
| GB1530141A (en) | Structural displacement monitor | |
| US2906928A (en) | Electrical network automatically responsive to a rate of change of a condition and a predetermined change of the condition | |
| FR2685544B1 (en) | OPERATION INDICATOR TYPE FUSE CARTRIDGE. | |
| GB1320489A (en) | Fire alarm system | |
| BR8306815A (en) | SYSTEM TO CHECK THE CONDITION OF CONNECTION OF SEPARATE STOP TERMINALS, AND INSPECTION DEVICE FOR USE WITH THE SYSTEM | |
| DE2649462C3 (en) | Alarm device for automatic signaling of landslide movements in the ground | |
| CH402676A (en) | Room protection system with capacitive measuring electrodes arranged in a bridge circuit | |
| ES8101270A1 (en) | Delayed-action warning control circuit | |
| Kujawski et al. | Effects of'on-off' cycling on equipment reliability(inertial navigation system and ship power control system reliability) | |
| GB1098186A (en) | Apparatus for assessing the level of solid contaminants in hydraulic systems | |
| GB1590946A (en) | Cable testing apparatus | |
| JPS534498A (en) | Instantaneous continuity testing circuit of fire sensor circuits in fire alarming systems | |
| DE2755826A1 (en) | Alarm loop monitoring circuit - has FET to allow check on amplitude of voltage in loop when supplied with DC and superimposed AC signal | |
| DE2001033A1 (en) | Fuse with monitoring device for signaling the load condition by photoelectric means, especially for semiconductor rectifier systems | |
| DE2327497C3 (en) | Detector for changes in resistance with a downstream alarm device | |
| JPS51148495A (en) | Resistance measuring device | |
| DE2242195B2 (en) | Fault indicator for four-wire three-phase electricity meters | |
| DE3912204A1 (en) | Battery operated warning light for e.g. construction site or barriers - has at least one under-voltage monitor which operates alarm if voltage falls below specified value | |
| JPS5214488A (en) | Monitoring device of automatic blood corpuscle measuring equpment | |
| DE2119615C3 (en) | Protection and monitoring device when forming small selenium rectifiers | |
| US3237099A (en) | Indicator having calibrated filaments for predicting component failure | |
| JPS52144298A (en) | Disaster monitoring apparatus | |
| SU65453A1 (en) | Instrument for continuous checking for the sameness of metal tape |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |