DE8906683U1 - Switch lock, especially for data processing equipment - Google Patents

Description

Switch lock, especially for data processing equipment

The invention relates to a switch lock, in particular for data processing devices, comprising a lock cylinder with a lock cylinder housing and a key-operable lock cylinder core and further comprising at least one electrical contact device within a contact chamber, which is arranged at the end of the lock cylinder housing remote from a key insertion slot of the lock cylinder core, wherein the lock cylinder core can be released for rotation relative to the lock cylinder housing by inserting a suitable key and the electrical contact device can be actuated by a switch rotor connected to the lock cylinder core for joint rotation.

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U . &igr; Such switch locks are intended for electronic

f _; devices, in particular data processing equipment,

Regulate access authorization. Only those who have a suitable key for the switch lock can operate the respective electronic device. However, there is a risk that when the key is inserted, a high static potential of the operator, who is charged to ground, could cause a flashover from the lock cylinder to the contact device. In the majority of cases, this leads to a malfunction of the electronic device, as its components are not designed for such a high potential voltage.

A switch lock is known from DE-GM 87 05 889, in which a switch rotor made of electrically insulating material that can be operated by a cylinder lock is used. This switch rotor also engages in a switch disk that is connected to fixed contacts of a switching device. The switch rotor made of insulating material, which is arranged between the metal lock and the switch disk, is intended to prevent arcing. In addition, to prevent arcing, the area of the separating gap between the housing, which is also made of insulating material, and the switch rotor made of the corresponding material is enlarged. This is achieved by at least one ring rib on the housing that is concentric with the switch rotor axis and engages in a shape-matched ring groove in the switch rotor. However, this known switch lock has some disadvantages. Three components - lock core, switch rotor, switch disk - are necessary to ensure the desired safety against arcing. In addition, the switching rotor and the housing have a complicated shape that can only be manufactured with great technical effort.

·

The object of the invention is to create a switch lock of the type mentioned at the beginning, which reliably prevents a flashover as a result of a potential difference between an operator and the components of an electronic device and is simple to manufacture and easy to install.

To solve the problem, it is proposed that the switching rotor be made in one piece with the locking cylinder core

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material, is made.

The proposed solution enables a particularly simple construction of a switch lock. Instead of the three components previously required, only a single central component needs to be manufactured and assembled. If an injection-moldable or castable, electrically insulating material is used, the central component of the switch lock can be manufactured particularly easily. The use ^of electrically insulating material for the lock cylinder core also reliably prevents arcing as a result of different potential levels.

Another proposal for solving the above-mentioned problem is that the switching rotor acts on at least one contact-making part made of electrically insulating material, which is secured in the switching chamber against rotation with the switching rotor, can be deflected by rotating the switching rotor and in turn acts on the contact device.

This additional solution also allows for a simple design of the switch lock and easy assembly. At the same time, the contact switching part made of electrically insulating material prevents arcing between the operator and the electronic components. With this solution

The locking cylinder core can be made of metal, as before. However, it is also possible that it is made of electrically insulating material, as in the first proposed solution. The combination of both measures reliably prevents arcing even with a very high potential difference.

In order for the contact switching part to return to its original rest position after deflection,

&lgr;&eegr; vor^sschläosn ^a^ oc aic &agr;^&eegr;&ogr; ^iim switching rotor^rt»n^sntial switching tongue is formed, which is clamped at one end so as to be fixed to the switching chamber, is elastically deflectable in the region of the switching rotor radially to its axis of rotation and cooperates with at least one actuating element attached to the switching rotor.

A wide variety of components can be used as the actuating element. The angle of rotation intended for a switching process determines the position of the actuating elements on the switching rotor. The switching rotor can therefore have correspondingly arranged cams. The actuating element can also be formed by an actuating pin that is attached eccentrically to the switching rotor and is parallel to the axis of rotation of the switching rotor. The actuating pin can be molded onto the switching rotor to make assembly easier or can be attached to it later. In the last-mentioned variant, it can also be provided that different fastening points for the actuating pin are provided on the same switching rotor. This means that the same switching rotor can be used for different switching locks with different switching positions. Only the actuating pin must be inserted accordingly in the respective switching lock.

The contact switching part can either be molded onto the switching chamber or on a separate

&bull;&diams; · I ·

-δ- contact carrier plate. The last-mentioned variant has the advantage that the contact-switching part is easy to manufacture and assemble. For this purpose, it is therefore further proposed that the contact-switching part is manufactured in one piece with a contact carrier plate on which at least part of the electrical contact device is arranged.

In order to achieve the most compact possible design with a small external diameter and external length, it is ^further provided that the contact carrier plate is arranged within the switching chamber perpendicular to the axis of rotation of the switching rotor, and that the contact switching part and the contact device are arranged on the side of the contact carrier plate remote from the key insertion slot of the locking cylinder core.

A further embodiment of the invention provides that the electrical contact device comprises at least one switching wire running tangentially to the switching rotor, which can be deflected by the switching rotor and, depending on the rotational position of the switching rotor, electrically connects or separates at least two contact parts fixed to the switching chamber. This ensures a secure contact connection between the contact parts to be switched. In order for the switching wire to return to its rest position after it has been deflected, it is advantageous that it is firmly clamped at one end, constantly rests against one of the contact parts and the switching rotor or a contact-transmitting part, and can be elastically deformed by the switching rotor or the contact-transmitting part to make contact with another contact part.

In order to ensure that the contact device can be easily replaced in the event of damage, it is advantageous that the contact chamber is in a

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The contact chamber housing is connected to the locking cylinder housing. If the contact device is damaged, the old contact chamber housing only needs to be replaced with a new one.

Since the individual contact parts of the contact device are sensitive to dirt or moisture, it is intended that the contact chamber housing is closed off by adjacent parts of the locking cylinder housing IQ and/or the locking cylinder core.

In order to make it as easy as possible to connect or disconnect the contact chamber housing with or from the locking cylinder housing, in particular when replacing one of the two assemblies, it is further proposed that the contact chamber housing be snapped onto the locking cylinder housing.

Simple manufacture and assembly can be achieved if the individual parts are combined into modules and pre-assembled. It is therefore proposed that the electrical contact device and, if applicable, the contact switching part be pre-assembled in the contact chamber housing.
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If the contact chamber housing is made of a material that can be deep-drawn or injection-molded or cast, it is advantageous that it is designed with a base and a casing, with the edge of the casing remote from the base resting against the lock cylinder housing. This pot-like design means that it can be manufactured in a simple manner using known machine tools.

The fact that the contact parts of the contact device penetrate the base of the contact chamber housing essentially parallel to the axis of rotation of the switching rotor contributes to a further compact design of the switching lock.

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A compact design in the axial direction and with only a small diameter is achieved.

The switch lock is particularly easy to manufacture if the contact chamber housing is made of insulating material, especially plastic. This also applies to the lock cylinder housing.

So that the operator can recognize the respective switching position and the switching can be achieved safely, it is proposed that the locking cylinder core can be secured in at least one discrete switching position by means of an elastically overcome locking mechanism. The locking mechanism can take a wide variety of forms, such as a ball locking mechanism. In order to prevent over-rotation beyond the last switching position, it is further proposed that the rotational path of the locking cylinder core relative to the locking cylinder housing be limited by a rotational path limiting device.

Further developments of the invention and an embodiment are explained below with reference to the drawing. It shows:

Fig. 1 shows a longitudinal section through an inventive

switch lock;

Fig. 2 is a plan view of the switching mechanism in the direction of arrow II in Fig. 1, with a switching chamber housing not being shown;

Fig. 3 a cross section through the inventive

Switch lock in unswitched state along the line IH-III/

-8th-

Fig. 4 a cross section through the switch lock in

switched state along the line III-III in Fig. 1; and

Fig. 5 a partial section along the line V-V in

Fig.2.

In Fig. 1, a safety lock is generally designated 10. It has a cylinder lock housing 12 and a contact chamber housing 14.

A longitudinal bore 16 is provided in the cylinder lock housing 12, which accommodates a cylinder lock core 18 of a cylinder lock. This cylinder lock core 18 has a key channel 20 extending from its one free front end. A flat key 22 (partially shown) can be inserted into this key channel 20 via an insertion slot 24. The flat key 22 is profiled on its broad sides. The key channel 20 has a corresponding counter-profiling. On the narrow side facing away from the back of the key, the flat key 22 has locking notches. These arrange core pins 26, which are inserted in a row one behind the other in radial bores in the axial direction of the cylinder lock core 18. Spring-loaded housing pins 28 are supported on the core pins 26, which are also slidably inserted in the axial direction of the cylinder lock core 18 in a row of radial bores arranged one behind the other. The pins 26, 28 are adjusted with a suitable key 22 so that the opposing end faces are aligned with the gap between the cylinder lock housing bore 16 and the outer surface of the cylinder lock core 18. In this case, the cylinder lock core 18 can then be turned using the key 22. The housing 12 has a further radial bore which is in the same plane as the radial bores for

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11

the housing pins 28 and in the direction of insertion of the key 22 is behind them. A rotation limiting pin 36 is inserted in this radial bore 34, which engages in a circumferential groove 38 of the cylinder lock core 18 (Fig. 2). The circumferential angle of this groove 38 corresponds to the maximum switching angle of the switching lock 10.

In the direction of insertion of the key 22, a spring-loaded ball 42 is arranged in a further radial bore 40, which is also in the same plane as the guides for the housing pins 28 and for the rotation limiting pin 36. The spring-loaded ball 42 serves as a locking device to fix the individual switching positions. For this purpose, the cylinder lock core 18 has recesses 44 distributed around the circumference, spaced apart from the respective switching positions, into which the ball 42 engages due to the spring 46 when the respective off position is reached (Fig. 2). To facilitate assembly of the housing pins 28, the associated springs 30, the rotation limiting pin 36, its spring 3""* as well as the ball 42 and the associated spring 46, the cylinder lock housing 12 has a separate base part 48. This separate base part 48 is placed and pressed into the cylinder lock housing 12 after the housing pins 28, the rotation limiting pin 36, the ball 42 and the springs 30, 37, 46 have been inserted, whereby the components listed at the beginning are permanently inserted into the cylinder lock housing 12 after the cylinder lock core 18 has been inserted.

As can be seen from the drawing figures 1 and 2, the cylinder lock core 18 has a molded, stepped and rotationally symmetrical switching rotor 50 at its end opposite the insertion slot 24. The step is achieved by the transition from a larger to a smaller diameter in the direction of the free end of the switching rotor 50. Three actuating pins 52 forming actuating members are attached to the step, two of which are at an angle of 45° to each other and the third at an angle of

157.5° to the other two (Fig. 2, 3, A). This arrangement can be varied depending on the desired switching states. In the embodiment

#; example are the actuating pins 52 on the switching rotor

g 5 FO parallel to its axis of rotation eccentrically on

f| molded onto this. However, it is also possible to

ijl that these pins 52 are manufactured separately and then

&idiagr;: in the switching rotor 50 in provided, not shown,

It is also possible for the switching rotor 50 to have several holes into which the pins 52 can be optionally inserted. The height of the pins 52 corresponds to the axial length of the free end of the switching rotor 50 with the smaller diameter.

15

The cylinder lock core 18 is centered in the contact chamber housing 14 via a pin 54. The centering can, however, also be carried out, just like the guidance, by a corresponding design of the housing bore 16 of the cylinder lock housing 12. Furthermore, with a corresponding design of the cylinder lock core 18, the pin can be used as a connection pin for a connection to a ground contact.

Finally, ^the cylinder lock housing 12 has two fastening devices 56 which serve to attach the switch lock 10 to, for example, a data processing device. These fastening devices 56 can have different shapes depending on the application and use of the switch lock 10.

The contact chamber housing 14, which accommodates a contact chamber 15, has the shape of a cuboid, one side of which has been removed. The wall opposite the removed side forms a base 58 and the adjoining walls form a casing 60 for the contact chamber 15. The cylinder lock housing 12 and the cylinder lock core protrude from the open side of the contact chamber housing 14.

18 with its integrally formed switching rotor 50 into the contact chamber 15. In this a contact carrier plate 62 is arranged, running perpendicular to the axis of rotation of the switching rotor 50. This contact carrier plate 62 | B has a central through-hole ^4 through which the switching rotor 50 with its actuating pins 52 protrudes. On the side of the contact carrier plate 62 facing away from the insertion slot 24, spring tongues 66 forming contact-switching parts are arranged (Fig. 3,4). These

extend parallel to the base 58 at a right angle to one of the walls of the casing 60. They are connected to one another by a connecting web 68. At their end adjacent to the wall of the casing 60, they are firmly attached to the contact carrier plate 62. At their free end, which is bent in the direction of the switching rotor 50, they can move freely. The fixed section is significantly smaller than the freely movable section, which creates the effect of a clamped beam. A reinforcing rib 70 is formed on the contact carrier plate 62 on the wall of the casing 60 opposite the spring tongues 66. This is intended on the one hand to stiffen the contact carrier plate 62 and on the other hand to ensure a sufficient distance between the contact carrier plate 62 and the base 58. Four contact pins 72 are inserted into the contact carrier plate 62 on the side provided with the spring tongues 66, which run parallel to the axis of rotation of the switching rotor 50 and protrude through the base 58. The respective lines of the corresponding device in which the switching lock 10 is installed can be attached to these contact pins. A contact wire 74 is assigned to each contact pin 72 in pairs, which has a slightly Z-shaped configuration and is inserted into two opposite pockets 76 a, b in the walls of the casing 60. One pocket 76a is designed in such a way that the wire 74 is arranged immovably in it. The other pocket 76b, on the other hand, is so large that the contact wire 74 can move freely in it. The contact wire 74 assigned to a pair of contact pins 72

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The associated contact wire 74 is in contact with the contact pin 72 closest to the pocket 76a and the associated spring tongue 66.

As can be seen from Fig. 4, after the appropriate key 22 has been inserted, the cylinder lock core 18 is rotated, so that the switching rotor 50, which is integrally formed on the cylinder lock core 18, is also pivoted. The actuating pins 52 arranged on it come into contact with the spring tongue 66, causing it to be deflected. This also causes the contact wire 74 to be deflected from its rest position and brought into contact with the associated pair of contact pins 72. This switches the switching lock 10. If the flat key 22 is turned back to its starting position, the actuating pins 52 release the spring tongue 66, so that it can pivot back to its starting position. The wire 74 can then also return to its starting position. The switching lock 10 is then in its unswitched state.

The cylinder lock housing 12 and the contact chamber housing 14 are connected to one another via a locking device 78, 80. The resilient snap parts 78 are arranged on two opposite walls of the casing 60 of the contact chamber housing 14, whereas the associated locking surfaces 80 are provided on the cylinder lock housing 12. However, a reverse arrangement is also possible.

The cylinder lock housing 12, the cylinder lock core 18, the contact carrier plate 62 and the contact chamber housing are made of electrically insulating material, preferably plastic.

The advantages of the proposed invention are clear from the above description. On the one hand,

a simple and easy to manufacture structure of a switch lock 10 is achieved. On the other hand, a flashover as a result of a different potential level is safely and reliably avoided.

Claims (1)

/&igr; K #iit#t»ie# · · · · -14- >·' Expectations ' 1. Switch lock, especially for data processing rate, comprising a locking cylinder with a &iacgr; 5 locking cylinder housing (12) and a key-operated locking cylinder core (18) and further comprising at least one electrical contact device within a contact chamber (15) which is arranged at the end of the locking cylinder core (18) remote from a key insertion slot (24; Lock cylinder housing (12), wherein the lock cylinder core (18/ can be released for rotation relative to the lock cylinder housing (12) by inserting a suitable key (22) and the electrical contact device is connected to a common rotation with the locking cylinder core (18) connected switching rotor (50), characterized in that the switching rotor (50) is made in one piece with the locking cylinder core (18) from electrically insulating material, in particular plastic. 2. Switch lock, in particular for data processing devices, comprising a locking cylinder with a lock cylinder housing (12) and a key-operated locking cylinder core (18) and further comprising at least one electrical contact device within a contact chamber (15) which is arranged at the end of the Lock cylinder housing (12), wherein the lock cylinder core (18) can be released for rotation relative to the lock cylinder housing (12) by inserting a suitable key (22) and the electrical contact device is connected to a common rotation with the locking cylinder core (18) connected switching rotor (50), &bull; · &igr; ■ r. in particular according to claim 1, characterized in that the switching rotor (50) acts on at least one contact-making part (66) made of electrically insulating material, which is secured in the contact chamber (15) against rotation with the switching rotor (50), can be deflected by rotating the switching rotor (50) and in turn acts on the contact device. 3. Switch lock according to claim 2, characterized in that the contact switching part (66) is designed as a switching switching tongue which is tangential to the switching rotor (50), which is clamped at one end so as to be fixed to the switching chamber, is elastically deflectable in the region of the switching rotor (50) radially to its axis of rotation and cooperates with at least one actuating member (52) attached to the switching rotor (50). 4. Switch lock according to claim 3, characterized in that the actuating member (52) is formed by an actuating pin (52) which is mounted eccentrically on the switching rotor (50) and directed parallel to the axis of rotation of the switching rotor (50). 5. Switch lock according to one of claims 3 or 4, characterized in that the actuating member (52) is manufactured in one piece with the switching rotor (50). 6. Switch lock according to one of claims 2 to 5, characterized in that the contact switching part (66) is integral with a contact carrier plate (62) on which at least part of the electrical contact device is arranged. 7. Switch lock according to claim 6, characterized in that the contact carrier plate (62) within the contact chamber (15) is perpendicular to the axis of rotation of the &bull; · &igr; t * &bull; t f IM &bull;&bull;II ' · &bull; ■ ti Switching rotor (50) is arranged, and that the contact switching part (66) and the contact device are arranged on the side of the contact carrier plate (62) remote from the key insertion slot (24) of the lock cylinder core (18). Switch lock according to one of claims 1 to 7, characterized in that the electrical contact device comprises at least one switching wire (74) running tangentially to the switching rotor (50), which can be deflected by the switching rotor (50) and, depending on the rotational position of the switching rotor (50), electrically connects or disconnects at least two contact pins (72) fixed to the switching chamber. 9. Switch lock according to claim 8, characterized in that the switching wire (74) is clamped at one end in a chamber-fixed manner, is constantly in contact with one of the contact parts (72) and the switching rotor (50) or a contact-transmitting part (66) and is elastically deformable by the switching rotor (50) or the contact-transmitting part (66) for making contact with a further contact part (72). 10. Switch lock according to one of claims 1 to 9, characterized in that the contact chamber (15) is accommodated in a contact chamber housing (14) connected to the lock cylinder housing (12). 11. Switch lock according to claim 10, characterized in that the contact chamber housing (14) is closed off by adjacent parts of the lock cylinder housing (12) and/or the lock cylinder core (18). &bull; · t &igr; t 12. Switch lock according to claim 11, characterized in that the contact chamber housing (14) is snapped onto the lock cylinder housing (12). 13. Switch lock according to one of claims 10 to 12, characterized in that the electrical contact device and optionally the contact connection part (§&) are pre-assembled in the contact chamber housing (14). 14. Switching lock according to one of claims 10 to 13, characterized in that the contact cylinder housing (14) is formed with a bottom (58) and with a casing (6C), the edge of the casing (6C) remote from the bottom (58) being fixed to the locking cylinder housing (12) is applied. 15. Switch lock according to claim 14, characterized in that contact parts (72) of the contact device penetrate the base (58) of the contact chamber housing (14) essentially parallel to the axis of rotation of the switching rotor (50). 16. Switch lock according to one of claims 10 to 15, characterized in that the contact chamber housing (14) is made of insulating material, in particular plastic. 17. Switch lock according to one of claims 1 to 16, characterized in that the locking cylinder housing (12) is made of insulating material, in particular plastic. 18. Switch lock according to one of claims 1 to 17, characterized in that the locking cylinder core (18) can be locked in at least one discrete switching position by means of an elastically overcome latching mechanism (42,44,46). 19. Switch lock according to claims 1 to 18, characterized in that the rotational path of the locking cylinder core (18) relative to the locking cylinder housing (12) is limited by a rotational path limiting device (36,37,38). 10 15 20 25 30 ! 35