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Door knocker with invisible lenticular breast plate

  • US 5,426,891 A
  • Filed: 04/04/1994
  • Issued: 06/27/1995
  • Est. Priority Date: 04/04/1994
  • Status: Expired due to Term
First Claim
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1. A combined door knocker and invisible viewer comprising:

  • (a) a knocker having;

    (i) a knocker body mountable on an entryway door and defining a lower portion;

    (ii) a hanging yoke pivotally mounted on a said body with a horizontal axis when said body is mounted on a door and having a depending resting position in which a lower portion of said yoke is defined;

    (iii) a static percussion element defined in the lower portion of said knocker body and substantially aligned with the lower portion of said yoke when said yoke is in said depending resting position;

    (iv) a gravity-operated moving percussion element mounted in the lower portion of said yoke for impacting said static percussion element when said yoke is released from an upper position to fall into said resting position;

    (v) said body defining a lenticular region having a front and a rear and defining a frontally visible visual theme incorporating the front of said lenticular region;

    (vi) said lenticular region having at least one surface restrictive to passage of visible light forwardly therethrough yet being substantially transparent to visible spectrum radiation passing therethrough in the rearward direction; and

    ,(b) a linear optical lens array for positioning in a door behind said lenticular region, with an optical axis passing through said lenticular region when positioned in said door, and the focal lengths of lenses in said lens array being such that an image is formable by a human eye positioned to the rear of said body, from light passing through said lenticular region from the front and through said optical array, said array being mountable in a door and behind said knocker body for enabling residents to view callers through said lenticular region permitting the identification of callers without the knowledge by the callers that there is a viewer behind the door knocker.

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