GB1471990A - Locks - Google Patents
LocksInfo
- Publication number
- GB1471990A GB1471990A GB3576174A GB3576174A GB1471990A GB 1471990 A GB1471990 A GB 1471990A GB 3576174 A GB3576174 A GB 3576174A GB 3576174 A GB3576174 A GB 3576174A GB 1471990 A GB1471990 A GB 1471990A
- Authority
- GB
- United Kingdom
- Prior art keywords
- lock
- retaining means
- diaphragm
- aug
- broken
- 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
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B39/00—Locks giving indication of authorised or unauthorised unlocking
- E05B39/02—Locks giving indication of authorised or unauthorised unlocking with destructible seal closures or paper closures
Landscapes
- Burglar Alarm Systems (AREA)
Abstract
1471990 Security-sealed lock E SMITH 13 Aug 1975 [14 Aug 1974] 35761/74 Heading B6P An emergency door lock incorporates a manually-movable retaining means which must be removed from operating parts before the lock can be unlocked and which is associated with a brittle element which breaks when the retaining means is moved. The retaining means may be a pin which passes through a fixed frangible diaphragm to hold parts of the lock mechanism together, or it may be a bolt which can be raised out of a locking position by manual operation of an arm once its rising head has broken through a frangible diaphragm. The diaphragm may be associated with an indicator which shows that it has been broken. When the retaining means has been moved, the lock may be opened by hand or by springs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3576174A GB1471990A (en) | 1975-08-13 | 1975-08-13 | Locks |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3576174A GB1471990A (en) | 1975-08-13 | 1975-08-13 | Locks |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1471990A true GB1471990A (en) | 1977-04-27 |
Family
ID=10381297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3576174A Expired GB1471990A (en) | 1975-08-13 | 1975-08-13 | Locks |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1471990A (en) |
-
1975
- 1975-08-13 GB GB3576174A patent/GB1471990A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |