Abstract:
A lock device is provided that includes a housing ( 2 ) having an opening ( 4 ) and a core ( 10 ) which is rotatably mounted in the opening ( 4 ) about a longitudinal axis of the core and which includes a key way ( 12 ) for reception of a key. Also included is a latching dement ( 20 ) that co-acts between the housing ( 2 ) and the core ( 10 ). An electronically controllable actuator ( 30 ) is mounted in the core ( 10 ) and is movable using a motor ( 40 ) between an opening-registering position in which movement of the latching element ( 20 ) to the release position is permitted, and a latching position in which movement of the latching element ( 20 ) to the release position is blocked. The motor ( 40 ) is provided in a recess ( 10 a) in the barrel surface ( 10 b) of the core at a distance from the end surfaces of the core.

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     This application is a National Stage of International Application No. PCT/SE2006/000506 filed on Apr. 27, 2006, claiming priority based on Swedish Patent Application No. 0500977-4, filed Apr. 29, 2005, the contents of all of which are incorporated herein by reference in their entirety. 
     FIELD OF INVENTION 
     The present invention relates generally to an electromechanical lock device and then particularly to a lock device in which an electrically or electromechanically operated latch mechanism is provided in a recess in the barrel surface of a lock core. 
     BACKGROUND OF THE INVENTION 
     Electromechanical lock devices that include an electrically co-acting or controlled latching mechanism for manoeuvring a lock cylinder are known to the art. For example, U.S. Pat. No. 5,839,307, the Swedish patent SE 9904771-4, and the European patent publication EP 1 134 335 A2 describe such lock devices. It is there described how an actuator is rotated by means of an electric motor. The actuator in turn permits or prevents the movement of a side bar. 
     In order to achieve greater flexibility it is preferred that the latching mechanism is entirely included in the cylinder core. In this way you can use the same lock cylinder housing as in all-mechanical lock devices. However, the problem is that the space in the cylinder core is limited and that the assembly of the latching mechanism can be difficult to realize in a simple way. 
     A known way to assemble a latching mechanism entirely provided in the core is to drill a hole in the inner end surface of the core, which extends in the longitudinal direction of the core. The drawback with this solution is that such a hole in the end surface limits the placement of other parts in the lock device, such as the coupling of a follower to the core. 
     It is also known to provide the latching mechanism in a recess in the barrel surface of the core, see for example the above mentioned European patent publication EP 1 134 335 A2. A drawback associated with this solution is that a cover must be provided, which keeps the actuator and the side bar in place. This leads to a weakening of the latching mechanism since the cover can yield when the core is subjected to large turning forces. 
     SUMMARY OF THE PRESENT INVENTION 
     An object of the present invention is to provide a lock device of the above kind in which the electrically controlled latch mechanism exhibits more security than in prior art devices and which also is easier to assemble. 
     The invention is based on the insight that a bore can be provided by means of a cutter or mill, which bore extends parallel to the longitudinal direction of the core and in which the actuator is provided. This, in combination with the fact that the latching element is provided in a slit provided between the bore and the barrel surface of the core, solves the above mentioned problem in prior art. 
     Accordingly, the invention provides a lock device according to claim  1 . 
     One advantage afforded by the inventive lock device is that forces on the side bar are taken up by the core itself, which improves the security. The recess provided at a distance from the end surfaces of the core also gives a flexible solution as regards assembly. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The invention will now be described by way of example and with reference to the accompanying drawings, in which 
         FIG. 1  is a perspective view of a lock device according to the present invention; 
         FIGS. 2   a  and  2   b  illustrate in detail a latch mechanism that comprises a side bar, an actuator, a motor, a pivotal pin, and a damping spring included in a lock device according to the present invention; 
         FIGS. 3   a - c  illustrate perspective views of a core comprised in a lock device according to the invention; 
         FIG. 4  illustrates a cross-section of the core in  FIGS. 3   a - c  taken in level with the actuator of the latching mechanism; 
         FIG. 5  illustrates a side view of the latching mechanism in an alternative embodiment of the invention; 
         FIGS. 6   a - c  illustrate top views of the latching mechanism shown in  FIG. 5 . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     There follows a detailed description of preferred embodiments of the invention.  FIG. 1  is an exploded view of a cylinder core, generally referenced  10 , in a lock device constructed in accordance with the invention. The core  10  is structured for placement in a circular-cylindrical opening  4  in a typical cylinder housing  2  and the core will therefore have an outer surface which corresponds essentially to the housing opening. The core includes a key way  12  which is configured to receive a key (not shown) in a typical fashion. The core  10  includes a plurality of pin tumbler openings  14  which receive tumbler pins (not shown) in a typical fashion. The manner in which an appropriately profiled key contacts the tumbler pins and places them on a parting line so that the core  10  can be rotated relative to the housing is known in the art and will not therefore will be described here in more detail. 
     The function or modus operandi of the tumbler pins is ignored throughout the entire description, and it is assumed and an appropriately profiled key has been inserted in the lock. When it is said, for instance, that the core is blocked or latched it is meant that the core is blocked by the electrically controlled latch mechanism described below. 
       FIG. 1  also illustrates a side bar  20  which is spring biased radially outwards by a spring  22  acting on the side bar. The function of the side bar is described in detail in, for instance, Swedish patent application 79067022-4, which is included by reference in the instant application. 
     The core also includes a generally cylindrical actuator  30  which can be rotated by means of a motor  40 . The motor is connected to an electronic module  48  by means of two conductors  42   a ,  42   b . These conductors extend in a groove in the barrel surface of the core. In addition to including a custom-made micro-regulating unit with an associated memory for storing and executing software together with drive circuits for driving the motor  40  etc, the electronic module also includes a key contact  44  in the form of an electrically conductive metal strip which is intended to make mechanical contact with a key inserted in the key channel  12 . This enables the key and the electronic module to exchange electrical energy and data. Thus, a battery powering the motor  40  and the electronic module  48  can be placed either in the lock device or in the key. A damping spring  46  is provided radially inwards of the motor for damping rotation of the motor  40 . 
     Rotation of the actuator  30  can also be influenced by a pivotal pin  50  which has a rotational axle that extends generally at right angles to the rotational axis of the actuator. The pivotal pin is disposed in a channel (not shown) that extends up to the key way  12 . 
     The side bar  20 , the actuator  30  and the motor  40  with associated components, such as the damping spring  46 , are disposed in a recess  10   a  in the barrel surface  10   b  of the core and are held in place by a cover  18 . Correspondingly, the electronic module  48  is disposed in a recess in the barrel surface of the core opposite the recess  10   a.    
     The latch mechanism is shown in more detail in  FIGS. 2   a  and  2   b , wherein the motor  40  has been omitted in  FIG. 2   b.    
     In  FIGS. 3   a - c  there are shown different perspective views of the core  10 , which all show the recess  10   a . It is here evident that the recess  10   a  is provided at a distance from the end surfaces of the core. With the expression “at a distance” is also meant that you do not drill though the end surface in order to provide the recess, even though the provided opening later is sealed. The recess  10   a  later turns into an essentially circular bore  10   c , which extends parallel with the longitudinal axis of the core and in which the actuator  30  is provided, see  FIG. 4 . It is also seen that the latching element in the form of the side bar  20  is provided in a slit  10   d  provided between the circular bore and the barrel surface of the core. 
     Because the lock device exhibits a circular bore, which extends parallel to the longitudinal axis of the core and in which the actuator is provided, good strength is obtained. This also applies to the placement of the side bar in a slit between the circular bore and the barrel surface of the core, which further enhances the security. The provision of the recess at a distance from the end surfaces of the core gives at the same time a flexible solution as regards assembly. 
     The slit  10   d  has preferably a width which essentially corresponds to the width of the side bar  20 . 
     The described lock device is assembled in the following way. First the recess  10   a  is provided in the barrel surface of the core  10  by means of a cutter or mill. Thereafter, starting from the recess  10   a , the circular bore  10   c  is provided by means of a ball mill. Then the pivotal pin  50 , the springs  22 ,  46 , and  52 , the actuator  30  and the motor  40 , the side bar  20  and finally the cover  46  are assembled in the above mentioned order. The motor and the actuator are placed so that the actuator is placed in the circular bore  10   c  while the side bar is placed in the slit  10   d.    
     In an alternative embodiment illustrated in  FIGS. 5 and 6   a - c , the motor  40  with a rotating shaft has been replaced by a linearly operating motor or solenoid  140 . This is connected to an actuator  130  which is movable in a longitudinal direction. A hole  130   a  is provided in the actuator  130 , which hole is arranged to receive a pin  120   a  on a side bar  120 . In the position illustrated in  FIG. 6   a  the side bar can thus be moved towards the actuator since its pin is in registry with the hole  130   a.    
     A damping spring  146  corresponding to the above described spring  46  abuts the shaft interconnecting the motor and the actuator. 
     A pivotal pin  150  corresponding to the pin of the first embodiment is provided for mechanical movement of the actuator during removal of the key from the lock device. It is thus provided with a pin  150   a  or other means making it possible to be influenced by means of a key inserted into the lock device. It is also spring biased by means of a spring (not shown). During turning of the pivotal pin, see  FIG. 6   b , a surface thereof presses against the end surface of the actuator, wherein the actuator is given a linear movement in the direction of the motor, see  FIG. 6   c . The hole  130   a  is thereby moved out of registry with the pin  120   a  of the side bar  120  and the side bar is thereby prevented from being moved inwardly towards the actuator. The actuator  130  is thereby given the same function as the rotating actuator  30  in the first embodiment. Although the actuator in this second embodiment is not rotating this latching mechanism can be assembled in a way corresponding to the way the latching mechanism of  FIGS. 2   a  and  2   b  is assembled, i.e., the recess  10   a  and the circular bore  10   c  are replaced by spaces corresponding to the shape of the parts of the latching mechanism shown in  FIGS. 5 and 6   a - c.    
     A lock device according to the present invention and a method of assembling the same have been described with reference to preferred embodiments thereof. However, a person of average skill in this art will be aware that these can be varied within the scope of the accompanying claims. 
     Although a combination of an electrically controlled latch mechanism and conventional pin tumblers has been illustrated it will be understood that the concept of the invention can also be applied to lock devices that lack other latching devices than the electronically controlled latch mechanism described above. 
     The latching element has been described in the form of a side bar  20 . It will be appreciated that the actuator  30  can cooperate with other kinds of latching elements, such as a latching pin with a function corresponding to that of the described side bar. 
     The expression bore has been used throughout this description for the space in which the actuator is provided. It will be appreciated that this expression should be interpreted broadly and that is to be considered to cover spaces for the actuator provided in different ways.