Door viewer plug
OwnerShan E. Harterinventor
Life of this patent
Estimating the term…
Abstract
A conventional commercial door viewer includes a lens at one end for providing a wide angle view and a hollow end through which a person would look. A truncated cone shaped plug fits within the hollow end to block light transmission through the door viewer. The plug is readily manually removable to use the door viewer and includes a removable lanyard to tether the plug in proximity to the door viewer.
Claims7
In door viewer for mounting in a door, which door viewer includes a hollow sleeve having an annular flange for bearing against the door, the improvement comprising a security device for regulating light transmission through said viewer, said security device comprising in combination:
- a) a tapered plug defining a solid truncated cone and having first and second ends, said first end having a diameter greater than a diameter of said second end, said second end and a part of said plug being demountably mountable within the sleeve of the door viewer for regulating the light transmission through the door viewer;
- b) a cap receiving only said first end and a part of said plug extending from said first end;
- c) a lanyard extending from said cap and retaining said plug attached to the door viewer;
- and
- d) attachment means for positioning between the annular flange of the sleeve and the door for securing said lanyard to the door.
In door viewer, which door viewer includes a cylinder supporting a lens system and a sleeve having a hollow end terminated by a radially extending annular flange and threadedly attached to the cylinder to mount the door viewer in a door, the improvement comprising a security device for controlling light transmission through said viewer, said security device comprising in combination:
- a) a tapered solid cone shaped plug having a first and a second end, said first end having a greater surface area than said second end, said second end of said plug being adapted for partial insertion into and engagement with the hollow end of the sleeve;
- b) a cap receiving and retaining said first end and only a part of said plug adjacent said first end;
- c) a flexible lanyard extending from said cap;
- and
- d) a section of said lanyard being disposed around said sleeve and adapted to be captured between the annular flange of the sleeve and the door.
Dependencies are inferred from the claim text.