Cylinder lock and key device

• US 5,823,028 A
• Filed: 03/11/1997
• Issued: 10/20/1998
• Est. Priority Date: 06/08/1993
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho
• Original Assignee: Kabushiki Kaisha Tokai RIKA Denki Seisakusho
• Inventors: Mizuno, Takashi, Mizuno, Yoshiyuki, Aoki, Hisashi, Kokubu, Sadao
• Primary Examiner(s): Gall, Lloyd A.
• Assistant Examiner(s): LUU, TUYET PHUONG PHAM
• Application Number:
  US08/814,682
• Time in Patent Office: 588 Days
• Field of Search: 70/275, 70/277, 70/278, 70/245, 70/248, 70/252, 70/395, 70/408
• US Class Current: 70/278.3
• CPC Class Codes: B60R 25/04 operating on the propulsion system, e.g. engine or drive motor
• CPC Class Codes: B60R 25/2063 Ignition switch geometry
• CPC Class Codes: G07C 9/00944 Details of construction or manufacture
• CPC Class Codes: Y10T 70/7062 Electrical type [e.g., solenoid]
• CPC Class Codes: Y10T 70/7079 Key rotated [e.g., Eurocylinder]

Abstract

A key-operated cylinder device includes a cylinder device body into which a key having a secondary coil is inserted, the cylinder device body including a coil mounting portion forming the front end portion of said cylinder device body; a primary coil mounted in said coil mounting portion, the primary coil wound on a coil bobbin; and shielding device for preventing the magnetic flux of the primary coil from flowing into the cylinder device body, the shielding device being arranged between the coil mounting portion and the primary coil.

Claims

1. A cylinder lock and key device in combination with an ignition switch and a wireless lock device, the cylinder lock and key device comprising:

a rotor rotatable from a locked off position to an unlocked on position;

a cylinder lock body surrounding said rotor and including a coil mounting portion forming a front end portion of said cylinder lock body;

a primary coil wound on a coil bobbin mounted in said coil mounting portion, said primary coil being connected to a control device for energizing said primary coil when said rotor is in the unlocked on position;

shielding means mounted in said cylinder lock body for preventing magnetic flux of the primary coil from flowing into the cylinder lock body, the shielding means being arranged between the coil mounting portion and the primary coil; and

a key having a secondary coil connected to a power cell in a charging circuit, said key being insertable into the cylinder lock body through a central opening in the coil bobbin, said key operable to rotate said rotor to the unlocked on position thereby allowing said control device to energize said primary coil to achieve magnetic coupling of the primary and secondary coils to charge the power cell, the power cell being for powering a signal transmitting circuit for transmitting a signal to the wireless lock device separate from the cylinder lock and key device.

2. A cylinder lock and key device as claimed in claim 1, wherein the shielding means is made of at least one of permalloy and is amorphous.

3. A cylinder lock and key device as claimed in claim 2, wherein the shielding means includes an insulating film to insulate the primary coil from the coil mounting portion.

4. A cylinder lock and key device as claimed in claim 1, wherein the shielding means is arranged on a cylindrical surface of the bobbin.

5. A cylinder lock and key device as claimed in claim 1, wherein the shielding means is arranged onto a bottom of the bobbin.