# US 7,954,862 B2 · Electromagnetic lock provided with a sliding bolt for a swinging-type door > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,954,862 B2 - Document ID: US7954862B2 - Status: Granted - Kind: B2 - Application number: 10/597,508 - Filed: 2005-01-18 - Published: 2008-09-18 - Granted: 2011-06-07 - Earliest claimed: 2004-01-28 - Assignees: Digit - Inventors: Jean-Michel Defert - Web page: https://patentgrep.com/patent/US7954862B2 ## CPC - E05B 47/026: {the bolt moving rectilinearly} - E05B 65/06: for swing doors {or windows, i.e. opening inwards and outwards} - E05B 65/1086: {Locks with panic function, e.g. allowing opening from the inside without a ley even when locked from the outside} - E05B 47/0002: {with electromagnets} - E05B 65/10: for panic or emergency doors - Y10T 70/5385: Spring projected - Y10T 292/1021: Motor - Y10T 292/11: Magnetic - E05B: LOCKS; ACCESSORIES THEREFOR; HANDCUFFS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract Electromagnetic lock includes a body, a retractable sliding bolt, and a movable plate structured and arranged to move the retractable sliding bolt and functioning as an armature of an electromagnet housed in the body. The movable plate is movable via two forces acting in the same direction and is structured and arranged to move the retractable sliding bolt to a protruding position. This Abstract is not intended to define the invention disclosed in the specification, nor intended to limit the scope of the invention in any way. ## Claims ### Claim 1 An electromagnetic lock comprising: a body; a linearly movable retractable sliding bolt; an electromagnet core arranged in the body; and a movable plate arranged in the body and being structured and arranged to contact and support the retractable sliding bolt and to function as an armature of an electromagnet, wherein the movable plate is movable via two forces acting in the same direction and is structured and arranged to move the retractable sliding bolt linearly to a protruding position, and wherein one of: the movable plate moves the retractable sliding bolt to the protruding position; and the electromagnet core is arranged between a front side of the movable plate and a free end of the retractable sliding bolt. ### Claim 2 (depends on 1) The lock of claim 1, wherein at least one of: the retractable sliding bolt is configured for a swinging-type door; the retractable sliding bolt comprises a projecting portion having oppositely arranged tapered surfaces; and the retractable sliding bolt comprises a pointed projecting portion. ### Claim 3 (depends on 1) The lock of claim 1, wherein the movable plate and the retractable sliding bolt are movable in the same direction. ### Claim 4 (depends on 1) The lock of claim 1, wherein the movable plate and the retractable sliding bolt are movable along a bolt displacement direction. ### Claim 5 (depends on 1) The lock of claim 1, wherein the two forces acting in the same direction are generated by springs and the electromagnet. ### Claim 6 (depends on 5) The lock of claim 5, wherein the springs bias the movable plate and the retractable sliding bolt towards the protruding position. ### Claim 7 (depends on 1) The lock of claim 1, wherein the movable plate is guided on columns and the columns comprise axes which are arranged parallel to a bolt displacement direction. ### Claim 8 (depends on 1) The lock of claim 1, wherein the electromagnet core is arranged between the movable plate and a protruding portion of the retractable sliding bolt when the retractable sliding bolt is positioned in the protruding position. ### Claim 9 (depends on 8) The lock of claim 8, further comprising springs arranged on a side of the movable plate opposite the retractable sliding bolt, wherein, when the electromagnet core is energized, the retractable sliding bolt is prevented from moving back away from the protruding position and wherein, when the electromagnet core is not energized, only the springs act to prevent the retractable sliding bolt from moving back away from the protruding position. ### Claim 10 (depends on 1) The lock of claim 1 wherein the movable plate is guided linearly in the body when the retractable sliding bolt moves to the protruding position and is guided linearly when the retractable sliding bolt moves away from the protruding position and wherein the electromagnetic lock is arranged on a swinging-type door. ### Claim 11 (depends on 1) The lock of claim 1, wherein the movable plate moves the retractable sliding bolt to the protruding position and the electromagnet core is arranged between the front side of the movable plate and the free end of the retractable sliding bolt. ### Claim 12 (depends on 11) The lock of claim 11, wherein the electromagnet core is arranged between the movable plate and a plate having an opening through which a protruding portion of the retractable sliding bolt projects. ### Claim 13 An electromagnetic lock comprising: an electromagnetic core; a linearly movable retractable sliding bolt; an armature plate supporting the retractable sliding bolt; and springs biasing the armature plate towards the electromagnetic core, wherein, when the electromagnetic core is energized, the armature plate linearly moves and positions the retractable sliding bolt in a protruding position and maintains the electromagnetic lock in a locked position, and wherein, when the electromagnetic core is not energized, forces generated by the springs maintain the protruding position of the retractable sliding bolt. ### Claim 14 (depends on 13) The lock of claim 13, wherein the retractable sliding bolt is configured for a swinging-type door, and wherein, when the electromagnetic core is not energized, only forces generated by the springs maintain the protruding position of the retractable sliding bolt. ### Claim 15 (depends on 13) The lock of claim 13, wherein the springs are mounted to members passing through the armature plate. ### Claim 16 (depends on 13) The lock of claim 13, wherein the armature plate is guided on columns with axes which are arranged parallel to a bolt displacement direction. ### Claim 17 (depends on 13) The lock of claim 13, wherein at least one of the retractable sliding bolt comprises a projecting portion having oppositely arranged tapered surfaces; and the retractable sliding bolt comprises a pointed projecting portion. ### Claim 18 (depends on 13) The lock of claim 13, wherein the electromagnetic core is arranged between the armature plate and a protruding end of the retractable sliding bolt when the retractable sliding bolt is positioned in the protruding position. ### Claim 19 (depends on 13) The lock of claim 13, wherein the armature plate is guided linearly when the retractable sliding bolt moves to the protruding position and is guided linearly when the retractable sliding bolt moves away from the protruding position and wherein the electromagnetic lock is arranged on a swinging-type door. ### Claim 20 An electromagnetic lock comprising: a body; an electromagnetic core arranged in the body; a bolt member comprising a protruding portion and being movable linearly to a protruding position; an armature plate arranged in the body; and springs arranged in the body and biasing the armature plate towards the electromagnetic core, wherein, when the electromagnetic core is energized, the electromagnetic lock is maintained in a locked position, and wherein, when the electromagnetic core is not energized, forces generated by the springs maintain the protruding position until the bolt member experiences a force tending to move the bolt member linearly into the body. ### Claim 21 (depends on 20) The lock of claim 20, wherein, when the electromagnetic core is not energized, only forces generated by the springs maintain the protruding position of the bolt member. ### Claim 22 (depends on 20) The lock of claim 20, wherein the bolt member is configured for a swinging-type door and the projecting portion includes oppositely arranged tapered surfaces. ### Claim 23 (depends on 20) The lock of claim 20, wherein the springs are mounted to members passing through the armature plate. ### Claim 24 (depends on 20) The lock of claim 20, wherein the electromagnetic core is arranged between the armature plate and the protruding portion of the bolt member when the bolt member is positioned in the protruding position, wherein the armature plate is guided linearly when the bolt member moves to the protruding position and is guided linearly when the bolt member moves away from the protruding position, and wherein the electromagnetic lock is arranged on a swinging-type door. ### Claim 25 (depends on 20) A method of locking a door, the method comprising: arranging the electromagnetic lock of claim 20 on an edge of the door; arranging a catch plate on a fixed member, the catch plate comprising an opening receiving therein the protruding portion of the bolt member; and energizing the electromagnetic core in order to maintain the locked position. ### Claim 26 (depends on 25) The method of claim 25, wherein, when the electromagnetic core is de-energized, biasing forces generated only by the springs maintain engagement between the opening and the protruding portion of the bolt member, and the springs oppose and allow movement of the bolt member into the body. ### Claim 27 (depends on 1) A method of locking a door, the method comprising: arranging the electromagnetic lock of claim 1 on an edge of the door; arranging a catch plate on a fixed member, the catch plate comprising an opening receiving therein a protruding portion of the retractable sliding bolt; and energizing the electromagnet core in order to maintain a locked position, wherein, when the electromagnet core is de-energized, biasing forces generated only by springs maintain engagement between the opening and the protruding portion of the retractable sliding bolt. ### Claim 28 (depends on 13) A method of locking a door, the method comprising: arranging the electromagnetic lock of claim 13 on an edge of the door; arranging a catch plate on a fixed member, the catch plate comprising an opening receiving therein a protruding portion of the retractable sliding bolt; and energizing the electromagnetic core in order to maintain the locked position.