Resources Contact Us Home
Electrical alarm system for installation in a window casing

Image Number 2 for United States Patent #4553134.

An electrical system is provided for attachment to basement windows or the like for the purpose of sounding an alarm automatically if the window is opened and the device is moved or tampered with. The system comprises a spring-loaded bar or a tube within a tube which is placed in the window frame without the need for screws, adhesive or other fastening means. When installed and spring-loaded, the assembly holds an electric switch in place against the side wall of the window. If the assembly is jarred or moved the switch is released, the electrical connection is either made or broken and an alarm is sounded.

  Recently Added Patents
Display unit and display method
Method and apparatus for supporting management actions for very high throughput in wireless communications
Decoding and presentation time stamps for MPEG-4 advanced video coding
Aspect ratio enhancement
Coffee cup stationery tab
Liquid dispensing apparatus
Apparatus and method for storing event information for an HVAC system
  Randomly Featured Patents
Self-storing coat
Method and device for simultaneous identification and correction of errors due to magnetic perturbations and to misalignments in the measurements of a magnetometer
Heat sink plate of alternator for vehicle
Naphthalenylsulfonylimidazolidinediones and their thioxo analogs useful as aldose reductase inhibitors
Component locating apparatus
Cord retainer
Walkway platform
Vehicle engine controller
Pile driver
Vector vaccines of bovine herpesvirus I