LOCKING DEVICE FOR DOORS

Abstract: The present invention relates to a locking device for doors, intended for connection between the dead-bolt (1) of the door and the drive means (2) of the lock. The invention is characterized in that a hinged arm (6) is connected to the dead-bolt (1) or its extension (5), a wheel (7) or pin being arranged at the other end of the arm (6) and designed to tumble into a recess (8) in a pivotable cam-disc (9), or to be disengaged from this recess by means of a link mechanism (11), whereupon in the latter position the cam-disc (9) is arranged to block the dead-bolt (1) in the first position and upon tumbling into the recess (8) to release it, and also that the dead-bolt (1) has an inclined surface (3) designed, upon pressure against the dead-bolt, to assist in the opening process.

Description: Locking device for doors Technical field: The present invention relates to a locking device for doors, intended for connection between the dead-bolt of the door and its drive means (door-frame or rotating cam, such as an electrical strike plate). Background art: It is important in different locking constructions that the lock has distinct positions, locked and unlocked. There is a risk when unlocking a door, for instance during emergency evacuation υ i premises, that a door cannot be opened although it has been unlocked in the normal manner. In critical situations this may have disastrous results. Both security and fire-protection aspects must be respected. The locked position shall be firm and unlocking shall not be made more difficult, for instance when a crowd of people are pushing towards the exist, thereby unintentionally preventing its opening. Description of the invention: The object of the invention is a solution of these and other similar problems, and is characterized in that a hinged arm is connected to the dead-bolt or its extension, a wheel or pin being arranged at the other end of the arm and designed to tumble into a recess in a pivotable cam- disc upon turning of the cam-disc, and also to be disengageable from this recess, whereupon the cam-disc in the latter case is arranged to block the dead-bolt and upon tumbling into the recess release it, and also that the dead-bolt has an inclined surface designed, upon pressure against the dead-bolt, to assist in the opening process. The arrangement of dead-bolt and drive means normally provides reliable locking and unlocking and the inclined surface assists in ensuring opening even in emergency situations arising out of pressure against the door and thus against the dead-bolt, since a force component is obtained in opening direction of the dead-bolt. The object of the invention can be used on double doors by applying it on the passive door, where pressure is obtained from a door-frame. The drive means comprises a spring bolt actuated by a door-frame. The invention can also be applied on a single door, such as a fire-door, where the pressure is obtained from a rotating cam, e.g. an electrical strike plate. An example of a lock for a single door where the object of the invention can be applied, is shown in Swedish patent No. 8900988-0 (464648) or US Patent No. 5195792. The drive means is in this case an electro-magnet, and the pressure is obtained from a rotating cam. In a preferred embodiment the cam-disc is arranged to be turned either with or against spring force and the same cam-disc is provided with a blocking protrusion, designed to cooperate in locking position with a locking surface in the extension of the dead-bolt. Brief description of the drawings: The invention will be described in more detail by way of example in the accompany drawings in which Figures 1 and 2 show the lock seen from two different directions, and Figure 3 shows a detailed view of the spring bolt. Description of embodiment: In Figures 1 and 2 a lock is shown having a dead-bolt (1) designed for engagement in a door-frame and to lock the passive door in double doors to a door-frame. The dead-bolt (1) is shaped with a bevelled surface (3) designed, upon pressure against the door, to produce a force component in opening direction. The dead-bolt has an extension (5) to which an arm (6) is hinged. A wheel (7) or pin for engagement in a recess (8) in a swivel cam-disc (9) is arranged at the outer end of the arm (6). This is the open position. To achieve locking, this wheel (7) is moved out of the recess and up along the outer edge of the cam-disc so that the cam-disc is pushed inwards and a blocking surface (13) cooperates with a locking surfaces in the extension (14) of the dead-bolt. This is the locked position. The arm (6) on which the wheel / pin is located, is connected to a link arm (11), the other end of which is connected to a swivel plate (10), actuated by a spring bolt. If the spring bolt (2) is pushed out the arm (6) with the wheel /pin (7) is actuated so that the latter tumbles into the recess and the cam-disc swings out under the influence of spring force (12), the blocks are released and the lock opens, partly due to influence from the bevelled surface (3) which receives pressure from the door-frame. The cam-disc is moved either against or with the spring force (12). (4) denotes attachment means for the various link mechanisms. Figure 3 shows a special picture of the spring bolt which constitutes the drive means of this lock. The device according to the invention can be varied in many ways within the scope of the following claims.

Claims: CLAIMS 1. A locking device for doors, intended for connection between the dead-bolt (1) of the door and the drive means (2) of the lock, characterized in that a hinged arm (6) is connected to the dead-bolt (1) or its extension (5), a wheel (7) or pin being arranged at the other end of the arm (6) and designed to tumble into a recess (8) in a pivotable cam-disc (9) upon turning of the cam-disc, which occurs when the dead-bolt is pushed in, and also to be disengageable from this recess by means of a link mechanism (11), whereupon the cam-disc (9) in the latter case is arranged to block the dead-bolt (1) and upon tumbling into the recess (8) release it, and also that the dead-bolt (1) has an inclined surface (3) designed, upon pressure against the dead-bolt, to assist in the opening process. 2. A locking device as claimed in claim 1, characterized in that the inclined surface (3) in the dead-bolt is arranged to be influenced by pressure from a door-frame in double doors, or from a rotating cam. 3. A locking device as claimed in any of claims 1-2, characterized in that the cam-disc (9) is arranged to be turned either with or against spring force (12). 4. A locking device as claimed in any of the preceding claims, characterized in that the cam-disc (9) is provided with a blocking protrusion (13), designed to cooperate in locking position with a locking surface (14) in the extension (5) of the dead-bolt. 5. A locking device as claimed claims 1-4, characterized in that a link arm (11) is connected to the arm (6) between its pivot point and the wheel/ pin (7), the other end of said link arm (11) being connected to a swivel plate (10) cooperating with the drive means (2). AMENDED CLAIMS [received by the International Bureau on 24 June 1996 (24. 06. 96); original claim 5 cancelled; original claims 1-3 amended; remaining claim unchanged (1 page)] 1. A locking device for doors, intended for connection between the dead-bolt (1) of the door and the drive means (2) of the lock, characterized in that the dead-bolt is provided with an inclined surface arranged to be influenced by pressure from a door¬ frame in double doors, or from a rotating cam, and that a link arm (11) is connected to an arm (6) between its pivot point and the wheel /pin (7), the other end of said link arm (11) being connected to a swivel plate (10) cooperating with the drive means (2). 2. A locking device as claimed in claim 1, characterized in that a wheel (7) or pin is arranged at the other end of the arm (6) and designed to tumble into a recess (8) in a pivotable cam-disc (9) upon turning of the cam-disc, which occurs when the dead-bolt is pushed in, and also to be disengageable from this recess by means of a link mechanism (11), whereupon the cam-disc (9) in the latter case is arranged to block the dead-bolt (1) and upon tumbling into the recess (8) release it, and also that the dead-bolt (1) has an inclined surface (3) designed, upon pressure against the dead-bolt, to assist in the opening process. 3. A locking device as claimed in claim 2, characterized in that the cam-disc (9) is arranged to be turned either with or against spring force (12). 4. A locking device as claimed in any of the preceding claims, characterized in that the cam-disc (9) is provided with a blocking protrusion (13), designed to cooperate in locking position with a locking surface (14) in the extension (5) of the dead-bolt.

Inventors: STENDAL JAN, STENDAL, JAN
Applicants: STENDAL JAN, STENDALS ELEKTRISKA AB, STENDAL, JAN
Application year: 1996
Main classification: E05C7
IPC codes: E05B15, E05B47, E05B65, E05C7