| 摘要 |
A tamperproof dead bolt device secured to a door jamb is disclosed including a stationary support plate assembly provided with a slotted section for a sliding dead bolt which in the secured position projects into the plane of the arc for opening the door. The dead bolt device further includes a lock member which prevents the dead bolt from being retracted from the secured position. When the dead bolt device is installed it is secured through the door jamb and wall partition to distribute the forces of an attempted forced entry over a larger surface area.
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