Portable door alarm

• US 3,261,010 A
• Filed: 11/26/1963
• Issued: 07/12/1966
• Est. Priority Date: 11/26/1963
• Status: Expired due to Term

• Current Assignee: John V. Kardel
• Original Assignee: John V. Kardel
• Inventors: Kardel, John V.
• Application Number:
  US04/326,160
• Time in Patent Office: 959 Days
• US Class Current: 340/546
• CPC Class Codes: G08B 13/08 by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind

Claims

1. A PORTABLE ALARM FOR APPLICATION TO ONE OF A PAIR OF RELATIVELY MOVABLE MEMBERS TO SIGNAL SUCH RELATIVE MOVEMENT, COMPRISING A CASING HAVING MEANS TO MOUNT THE SAME ON ONE OF SAID MEMBERS, AN ELECTRICALLY POWERED SIGNAL UNIT IN SAID CASING, MEANS IN SAID CASING TO PROVIDE AN ELECTRICAL CIRCUIT TO CONTROL THE ENERGIZATION OF SAID SIGNAL UNIT, INCLUDING A MOVABLE SWITCH CONTROL ELEMENT PROJECTING EXTERNALLY OF THE CASING FOR ENGAGEMENT WITH THE OTHER OF SAID MEMBERS IN A MANNER TO BE MOVED UPON SAID RELATIVE MOVEMENT OF THE MEMBERS, AND A SWITCH HAVING CONTACTS OPENED AND CLOSED RESPECTIVELY BY SAID CONTROL ELEMENT IN FIRST AND SECOND POSITIONS OF THE LATTER PRIOR TO AND AFTER SAID RELATIVE MOVEMENT, SAID SWITCH CONTROL ELEMENT BEING MOVABLE TO A FURTHER POSITION IN RELATIVELY RETRACTED RELATION TO SAID CASING, AND IN A LOCATION IN WHICH THE CONTROL ELEMENT IS NOT ENGAGEABLE BY SAID OTHER RELATIVELY MOVABLE MEMBER IN WHICH FURTHER POSITION SAID ELEMENT OPENS SAID CONTACTS.

9. A PORTABLE ALARM FOR APPLICATION TO ONE OF A PAIR OF RELATIVELY MOVABLE MEMBERS TO SIGNAL SUCH RELATIVE MOVEMENT, COMPRISING A CASING HAVING MEANS TO REMOVABLY MOUNT THE SAME ON ONE OF SAID MEMBERS, AN ELECTRI-