GB1453669A - Sealed envelope examining device - Google Patents
Sealed envelope examining deviceInfo
- Publication number
- GB1453669A GB1453669A GB2425674A GB2425674A GB1453669A GB 1453669 A GB1453669 A GB 1453669A GB 2425674 A GB2425674 A GB 2425674A GB 2425674 A GB2425674 A GB 2425674A GB 1453669 A GB1453669 A GB 1453669A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- metal
- base
- letters
- drawer
- 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
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
- G01V3/10—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils
- G01V3/104—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils
- G01V3/105—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices using induction coils using several coupled or uncoupled coils forming directly coupled primary and secondary coils or loops
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Electromagnetism (AREA)
- Environmental & Geological Engineering (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
- Emergency Alarm Devices (AREA)
Abstract
1453669 Metal detectors H S KULIK and J SCHACHTER 31 May 1974 [28 Feb 1974] 24256/74 Heading G1N A device for sensing metal in "letter bombs" comprises a base unit housing the detector circuit and one sensor coil and a second coupled coil supported on a bridge structure above the base. Letters may be placed in a drawer slidable on the base beneath the bridge Figs. 1 and 5 (not shown), or the device may be inclined on a wire support for letters to slide down Fig. 6 (not shown). A hinged cover is provided with a transverse bar to hold the drawer in the closed position. CIRCUIT:- As described Fig. 7 (not shown) the coils are connected in a transistor oscillator circuit whose amplitude varies when metal disturbs the coupling between them. The variation triggers a thyristor alarm circuit.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US446698A US3893022A (en) | 1974-02-28 | 1974-02-28 | Sealed envelope examining device for detecting the presence of metal |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1453669A true GB1453669A (en) | 1976-10-27 |
Family
ID=23773535
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2425674A Expired GB1453669A (en) | 1974-02-28 | 1974-05-31 | Sealed envelope examining device |
Country Status (2)
Country | Link |
---|---|
US (1) | US3893022A (en) |
GB (1) | GB1453669A (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4266193A (en) * | 1978-09-11 | 1981-05-05 | Most Lynn W | Means for detecting metal objects |
US4883264A (en) * | 1987-11-02 | 1989-11-28 | Laurel Bank Machines Co., Ltd. | Bill disbursing system |
US5316857A (en) * | 1988-12-03 | 1994-05-31 | Deutsche Aerospace Airbus Gmbh | Sheet material having a recognition enhancing feature |
BR8907361A (en) * | 1989-02-17 | 1991-04-16 | Bell Helicopter Textron Inc | PROCESS TO DETECT REINFORCEMENT MATERIAL IN COMPOUND SHEET STACKS, PROCESS TO PROTECT SURFACE OF AN UNCURED COMPOSITE SHEET WHILE ALSO PROPECTING A MEANS TO DETECT THE PRESENCE OF THE PROTECTIVE REINFORCEMENT |
AT349U1 (en) * | 1994-05-03 | 1995-08-25 | Tkadletz Herbert Dipl Ing Mag | PROTECTIVE DEVICE AGAINST THE EXPLOSION EFFECT OF BOMBS |
US6420866B1 (en) * | 1998-09-21 | 2002-07-16 | Reliance Electric Technologies, Llc | Apparatus and method for detecting metallized containers in closed packages |
US6339331B1 (en) * | 1999-12-14 | 2002-01-15 | General Electric Company | Methods and apparatus for inspecting TV-shaped openings, using eddy current |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2966582A (en) * | 1957-01-11 | 1960-12-27 | Wachtel Kurt | Railroad signalling |
-
1974
- 1974-02-28 US US446698A patent/US3893022A/en not_active Expired - Lifetime
- 1974-05-31 GB GB2425674A patent/GB1453669A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US3893022A (en) | 1975-07-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |