US Patent: 788,788
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| Burglar Alarm
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Patentee:
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| James Naser (exact or similar names) - Westminster, London, S. W., England |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jul. 06, 1904 |
| Granted: |
May 02, 1905 |
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Patent Pictures:
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Joel Havens
MJD Auctions
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Description: |
| Abstract:
This invention relates to burglar-alarms of the wedge type, which not only sound an alarm when an attempt is made to open the door, windowv, or the like, but at the same time form a wedge adapted to resist such opening. Such alarms hav e hitherto been constructed from sheet metal, two plates being hinged together at an acute angle to form a wedge, the movement of one plate caused by an attempt to open the door to which it is applied causing an alarm-bell to ring, a third hinged plate or other medium transferring the movement to the trigger of the bell. Owing to the weakness of the sheet-metal construction, such alarms have to be made of inconveniently large dimensions to attain anything like practical strength, and even then they are very easily damaged and do not offer much resistance against a persistent attempt to open the door.
Claim:
A burglar or similar alarm and door or like wedge comprising a block having a flat Io under face and an inclined upper face, a base-plate having side wings to form guides for the block, means for loosely securing the block between said wings to permit relative longitudinal movement and an alarm-bell on the base-plate having its trigger in contact with said block. |
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