Device for detecting and signalling the presence of objects in a closed container and a mailbox containing the same

• US 5,377,906 A
• Filed: 10/29/1993
• Issued: 01/03/1995
• Est. Priority Date: 10/29/1993
• Status: Expired due to Fees

• Current Assignee: Randall Mason
• Original Assignee: Randall Mason
• Inventors: Mason, Randall
• Primary Examiner(s): Milano, Michael J.
• Application Number:
  US08/143,070
• Time in Patent Office: 431 Days
• Field of Search: 232/34, 232/35, 232/36, 340/569
• US Class Current: 232/34
• CPC Class Codes: A47G 29/1212 comprising electrical parts

Abstract

A device for detecting and signalling the presence of an object in a closed container, comprising:

a housing;

one or more sensors each comprising an electronic circuit having a detector and an optical signal trigger, wherein the one or more sensors are coupled to the housing;

a power source electrically connected to the one or more sensors; and

an optical signal electrically connected to the optical signal trigger,

and its use in providing an electronic mailbox which allows an observer to detect the presence of mail from a remote location.

Claims

1. A device for detecting and signalling the presence of an object in a closed container, comprising:

a housing;

one or more sensors each consisting essentially of an electronic circuit having a detection means and an optical signal triggering means, wherein said one or more sensors are coupled to said housing, wherein said detection means consists of an infrared transmitter which emits an infrared signal and an infrared detector for detecting said infrared signal after said infrared signal is reflected off the object to be detected and wherein said optical signal triggering means consists of an electrical circuit having an amplifying transistor in electrical connection with a capacitor which functions as a charge pump circuit for triggering said optical signalling means to generate a signal;

a power source electrically connected to said one or more sensors; and

an optical signalling means electrically connected to said optical signal triggering means.

2. The device of claim 1, wherein said infrared transmitter and said infrared detector have an adjustable focal point of from 0.1 to 15 cm.

3. The device of claim 1, wherein said optical signalling means is a high-intensity LED.

4. The device of claim 1, wherein said optical signalling means is a xenon strobe.

5. The device of claim 1, wherein said housing has a shape of a rectangle with said one or more sensors being a single sensor placed in the approximate center of the rectangle relative to both a long and short axis of the rectangle.

6. The device of claim 1, wherein said power source is a member selected from the group consisting of batteries, solar cells, alternating current and turbines.

7. The device of claim 1, wherein said optical signalling means has a field of detection of less than 10 radial degrees.

8. The device of claim 1, wherein said optical signalling means is visible from a distance of up to 300 yards.

9. The device of claim 1, wherein said optical signalling means is visible from a distance of up to 1000 yards.

10. The device of claim 1, wherein said optical signalling means is visible from a distance of up to 2000 yards.

11. The device of claim 1, wherein said one or more sensors are located below said surface of said housing and said detection means operates through said surface of said housing.

12. The device as claimed in claim 1, wherein the device further comprises a mailbox in which the device is contained and wherein said optical signalling means is mounted to an external surface of said mailbox.

13. A device for detecting and signalling the presence of an object in a closed container, comprising:

a housing;

one or more sensors each comprising an electronic circuit having a detection means and an optical signal triggering means, wherein said one or more sensors are coupled to said housing;

a power source electrically connected to said one or more sensors; and

an optical signalling means electrically connected to said optical triggering means, wherein said optical signalling means comprises a high intensity LED having a shroud for increased security providing a decreased field of detection of less than 10 radial degrees.

14. The device as claimed in claim 13, wherein the device further comprises a mailbox in which the device is contained and wherein said optical signalling means is mounted to an external surface of said mailbox.