GB636985A - An electric alarm device in connection with safety-chains for doors - Google Patents
An electric alarm device in connection with safety-chains for doorsInfo
- Publication number
- GB636985A GB636985A GB33933/47A GB3393347A GB636985A GB 636985 A GB636985 A GB 636985A GB 33933/47 A GB33933/47 A GB 33933/47A GB 3393347 A GB3393347 A GB 3393347A GB 636985 A GB636985 A GB 636985A
- Authority
- GB
- United Kingdom
- Prior art keywords
- door
- chain
- slot
- branch
- contacts
- 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
- E05B45/00—Alarm locks
- E05B45/06—Electric alarm locks
Landscapes
- Burglar Alarm Systems (AREA)
Abstract
636,985. Door-chain fastenings. MARTENS, D. G. Dec. 23, 1947, No. 33933. Convention date, May 3, 1939. [Class 44] [Also in Group XXXVIII] In a safety-chain fastening for doors incorporating contacts for operating an electric alarm (see Group XXXVIII) the guiding member 1 is a rectilinear casing the front wall of which has a substantially U-shaped slot adapted to receive the sliding member 5 attached to the chain 2. One branch 4<SP>1</SP> of the U-shaped slot, intended for non-alarm daytime use, extends in the normal manner from the insertion passage 6 towards the gap between the door D and door-frame K, while a second branch for night use is of angular shape extending from the insertion passage 6 in a first portion 4 parallel to the door-gap, i.e., transverse to the chain pull, and thereafter in a short second portion 4<SP>11</SP> parallel to the branch 41 and provided with contacts which operate the alarm when bridged by the member 5. For night use the member 5 is retained in the position shown by a spring plate behind the slot 4<SP>11</SP>, and opening the door tautens the chain causing member 5 to move along the slot 4<SP>11</SP> and operate the contacts. This action is made more sensitive by the provision of a small-angular projection 14 which engages the chain to tauten it for very slight movement of the door D. If the normal daytime use is not required the upper slot 4<SP>1</SP> may be omitted from the guiding member 1 (Fig. 3, not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO636985X | 1939-05-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB636985A true GB636985A (en) | 1950-05-10 |
Family
ID=19906441
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB33933/47A Expired GB636985A (en) | 1939-05-03 | 1947-12-23 | An electric alarm device in connection with safety-chains for doors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB636985A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3406386A (en) * | 1965-10-04 | 1968-10-15 | Gen Alarm Corp | Chain lock alarm |
US3569950A (en) * | 1968-04-29 | 1971-03-09 | Paul L Betz | Lock-alarm combination |
-
1947
- 1947-12-23 GB GB33933/47A patent/GB636985A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3406386A (en) * | 1965-10-04 | 1968-10-15 | Gen Alarm Corp | Chain lock alarm |
US3569950A (en) * | 1968-04-29 | 1971-03-09 | Paul L Betz | Lock-alarm combination |
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