EP3561203B1 - Padlock for securing a switch - Google Patents

Description

The invention relates to a padlock for securing a switch of an industrial system, in particular a so-called lockout padlock, according to the preamble of claim 1.

A particular area of application for a padlock is in the area of occupational safety. For the maintenance of an industrial plant, for example a production machine, part of the plant or the entire plant must be shut down. There is a risk here that the part of the industrial system which has been deactivated for the purpose of maintenance work is inadvertently reactivated while the maintenance work is still ongoing. This can result in a significant risk to maintenance personnel. It is therefore common for maintenance personnel to switch an switch assigned to the industrial system or the shutdown part to the OFF position for the duration of the maintenance work and to secure it in this position, i.e. the switch is immediately blocked or access to the switch is blocked. The switch mentioned is typically an energy supply switch, for example an electrical main switch of a control device or an energy supply device of the industrial system.

In order to effectively prevent accidental activation of the industrial system by another person, each maintenance person hangs and locks a padlock before starting work on said switch or on a locking device assigned to the switch. The switch is thereby secured in its OFF position, ie the switch cannot be accidentally moved from one be brought back into an ON position by another person. When the maintenance person has finished their work, they unlock their padlock and release it from the switch. Each maintenance person is usually assigned his own individual padlock.

This procedure is also known as lockout. Accordingly, the padlock used is called a lockout lock. The document US 5,449,867 A shows such securing an electrical toggle switch by means of a padlock. From the document US 3 171 908 A it is known to secure the position of a rotary switch by means of a padlock.

In connection with securing such a switch of an industrial system in this way, it is known to equip the lockout padlock used with a lock housing which is at least partially made of plastic, a bracket being held displaceably on the lock housing, and with a lock cylinder in the lock housing is arranged, which has a cylinder housing and a cylinder core rotatable in the cylinder housing about a cylinder axis. The padlock also has a key, by means of which the cylinder core can be rotated between a locking position and an unlocking position. In the locked position, the shackle is locked or lockable on the lock housing, in particular in a closed position of the shackle, for example after the shackle has been suspended in an eye of the switch. In the unlocked position, the bracket is released for an opening movement relative to the lock housing, for example in order to be able to remove the bracket from the eye of the switch.

The design of the lock housing made of plastic results in a particularly light padlock with sufficient mechanical stability, which is advantageous when used as a lockout padlock, because the maintenance personnel sometimes carry several lockout padlocks at the same time. A plastic housing can also contribute to desirable electrical insulation. Furthermore, by using a plastic housing, there is a particularly simple possibility of color-coding the padlock.

The lower stability of a plastic housing compared to a lock housing made of metal, however, does not represent a serious disadvantage with a lockout padlock, since the padlock only serves to secure a switch against unintentional actuation, but not, for example, as protection against theft. A lockout padlock is typically used anyway in an environment to which unauthorized third parties have no access (e.g. secured factory premises). For this reason, a relatively simple locking mechanism for the lockout padlock can be provided, in particular a simple locking cylinder. Here, the locking cylinder can have a plurality of tumblers which are movable between a release position and a locking position in order to lock the cylinder core relative to the cylinder housing when the cylinder core is in its locking position. The tumblers can be formed by pin tumblers which are spring-loaded in the direction of their locking position, the pin tumblers being able to be moved against their pretension by inserting the assigned key into the locking cylinder such that a separating surface between the cylinder housing and the cylinder core is no longer blocked by the pin tumblers is.

Such a lockout padlock with a plastic housing and a simple locking mechanism is, for example, from the documents US 7 278 283 A , US 5 755 121 A and US 2012/0186308 A1 known.

Under harsh environmental conditions, especially when the industrial plant is only partially shut down, it can be problematic mechanical The lockout padlock comes into play, for example due to vibrations caused, for example, by a production machine and transmitted to the switch to which the lockout padlock is attached or hung.

It is an object of the invention to provide a lockout padlock which enables a switch of an industrial system to be reliably secured.

This object is achieved by a padlock with the features of claim 1, and in particular in that the lock cylinder of the lockout padlock has a plurality of tumblers, each tumbler between a respective release position in which the tumbler locks the cylinder core for rotation in its Releases unlocking position, and a respective locking position, in which the tumbler locks the cylinder core in its locking position relative to the cylinder housing, the plurality of tumblers comprising a plurality of pin tumblers, which are spring-loaded in the direction of their respective locking position, and wherein the plurality of tumblers further includes several supplementary tumblers that are not spring-loaded and are freely movable between their respective release position and their respective blocking position.

The lockout padlock according to the invention thus has a lock cylinder which comprises a combination of spring-loaded pin tumblers and non-spring-loaded, freely movable supplementary tumblers. The spring-loaded pin tumblers lock the cylinder core, when it is in its locking position, against a rotational movement relative to the cylinder housing. As a result, a sufficient blocking effect is already achieved under normal ambient conditions. In addition, however, several additional tumblers are provided, which are freely movable in the lock cylinder. In contrast to the pin tumblers, the supplementary tumblers are not spring-loaded and thus show a different kinematic behavior than the spring-loaded pin tumblers when exposed to strong mechanical vibrations or vibrations of different frequencies, which may be transmitted from the vicinity of the padlock to the suspended padlock.

The additional tumblers are not absolutely necessary when used as a lockout padlock for the purpose of theft protection, since a lockout padlock, as explained at the beginning, is typically used anyway in an environment to which unauthorized third parties have no access. However, the additional tumblers can provide additional protection against unintentional opening of the lockout padlock.

With regard to the pin tumblers, it is conceivable in this regard that the pin tumblers can be unintentionally accelerated and moved due to their spring preload, in particular in a resonance frequency range that depends on the spring characteristics and the mass of the respective pin tumbler to be moved, by strong vibrations introduced from the outside. On the other hand, due to their free mobility, the supplementary tumblers can already be moved by relatively weak vibrations between their respective blocking position and release position, whereby the supplementary tumblers begin to move or close earlier than the pin tumblers when vibrations occur, in a non-uniform pattern between their respective blocking position and release position "leap". By providing several supplementary tumblers, the likelihood is reduced that in the case of strong vibrations (even if the pin tumblers are accelerated against their spring preload), the supplementary tumblers all assume the same position.

Thus, with the lockout padlock according to the invention, it is reliably prevented that the locking cylinder even with unusually strong mechanical Vibrations or vibrations in a resonance area of the pin tumblers, which could be transmitted from the fastening environment of the lockout padlock to the lock cylinder, are unintentionally released. As a result, it can be ruled out with even greater certainty than before that all tumblers are accelerated and moved at a certain point in time without the associated key being present in such a way that the interface between the cylinder housing and the cylinder core is temporarily no longer blocked, even if in the fastening environment of the Lockout padlock unusual vibrations or other shocks occur.

Possible embodiments of the invention are explained below and in the dependent claims, wherein these embodiments can also be advantageously combined with one another.

According to one embodiment, the supplementary tumblers are cylindrical or essentially cylindrical, the supplementary tumblers in particular having a shape which is graded along their longitudinal extent (such as a circumferential constriction) and / or beveled ends (such as a cone or truncated cone shape). Due to a cylindrical shape, the supplementary tumblers can be particularly well supported in a freely movable manner, so that the supplementary tumblers react in a non-uniform manner to the action of vibrations.

According to one embodiment, the freely movable supplementary tumblers are each formed in one piece. It can also be hereby achieved that the supplementary tumblers show a different response behavior to vibrations introduced from the outside than the pin tumblers, which are typically formed in two parts.

According to one embodiment, the supplementary tumblers along their respective direction of movement are shorter than the pin tumblers. This means that the mass of the respective supplementary tumbler is less than the mass of a respective pin tumbler, which in turn causes the supplementary tumblers to have a different response to vibrations introduced from outside than the pin tumblers, especially if the respective diameter of the supplementary tumblers is selected to be similar is like the respective diameter of the pin tumblers.

According to one embodiment, the supplementary tumblers are mounted in the rotatable cylinder core, the supplementary tumblers engaging in a locking recess on an inner circumference of the cylinder housing in their respective locking position. The fact that the respective supplementary tumbler is mounted in the cylinder core and only engages with one end in an associated locking recess in the cylinder housing in its locked position ensures that the freely movable supplementary tumblers are supported particularly smoothly.

Here, the locking recess provided on the inner circumference of the cylinder housing can extend with respect to the direction of rotation of the cylinder core along a limited circumferential angle, which essentially corresponds to the width of the respective supplementary tumbler, that is, apart from manufacturing tolerances and a certain amount of movement, the respective supplementary tumbler is almost seated with respect to the direction of rotation of the cylinder core form-fitting in the blocking recess. The locking recess in the direction of rotation of the cylinder core can be limited by at least one guide slope. This has the effect that when the cylinder core is deliberately rotated by means of the assigned key, the supplementary tumbler located in its locked position is lifted or led out of the locking recess of the cylinder housing along the respective guide slope. The respective locking recess of the cylinder housing can also be limited on both sides with respect to the direction of rotation of the cylinder core by a respective guide slope.

According to one embodiment, the supplementary tumblers of the locking cylinder are translational, i.e. linear, flexible.

According to one embodiment, the supplementary tumblers are movable within a respective plane that is perpendicular to the cylinder axis. On the other hand, mobility of the supplementary tumblers along the cylinder axis is not absolutely necessary, since vibrations of the locking cylinder that run along the cylinder axis do not cause the same risk of unintentional release of the cylinder core as vibrations that run perpendicular to the cylinder axis.

According to one embodiment, the supplementary tumblers of the locking cylinder can be arranged one behind the other along the cylinder axis, in particular in alignment with one another.

According to one embodiment, the supplementary tumblers of the locking cylinder are movably mounted with respect to the cylinder axis in the radial direction or offset parallel to a radial direction.

According to one embodiment, the bracket extends within an extension plane. In particular, the bracket can have a first leg and a second leg, which runs parallel to the first leg, the two legs running within the said plane of extension of the bracket or defining the plane of extension of the bracket. In such an embodiment, the direction in which the supplementary tumblers are movable can run at a non-zero angle to the plane of extension of the bracket. The angle mentioned can in particular be one act acute angle. In other words, the direction of the mobility of the supplementary tumblers can run obliquely to the plane of extent of the bracket. In this way it can be achieved that vibrations of the lockout padlock, which are introduced from the fastening environment of the lockout padlock via the bracket to the locking cylinder, generally run in a different direction than the direction of the mobility of the supplementary tumblers. As a result, the supplementary tumblers are less likely to be accelerated or moved away from their respective blocking position by such vibrations. A corresponding arrangement can be provided for the pin tumblers (the direction of the mobility of the pin tumblers runs obliquely to the plane of extent of the bracket).

According to one embodiment, the direction of movement of the pin tumblers and the direction of movement of the supplementary tumblers run parallel to one another or at an angle other than zero. For example, the direction of movement of the pin tumblers and the direction of movement of the supplementary tumblers, viewed in a projection along the cylinder axis, can be at an angle of 20 °, 30 °, 45 °, 60 °, 75 °, 105 °, 120 °, 135 °, 150 °, 165 °, 180 ° or an intermediate value thereof.

According to one embodiment, the pin tumblers of the locking cylinder are arranged one behind the other along the cylinder axis.

According to one embodiment, the pin tumblers of the locking cylinder are translational, i.e. linear, flexible.

According to one embodiment, the pin tumblers of the locking cylinder are spring-loaded with respect to the cylinder axis in the radial direction or offset parallel to a radial direction.

According to one embodiment, the pin tumblers of the locking cylinder are cylindrical or essentially cylindrical, wherein the pin tumblers can in particular have a shape that is stepped along their longitudinal extent (such as a circumferential constriction) and / or beveled ends (such as a conical or truncated cone shape).

According to one embodiment, the pin tumblers of the locking cylinder each have a housing pin and a core pin, the housing pin being essentially mounted in the cylinder housing and the core pin being essentially mounted in the cylinder core. If the respective separating point between the housing pin and the core pin of the pin tumblers lies on the separating surface between the cylinder housing and the cylinder core and if the supplementary tumblers do not lock the cylinder core, the cylinder core can be turned into the unlocked position.

According to one embodiment, each pin tumbler is assigned a respective compression spring which spring-loads the pin tumbler in the direction of its locking position.

According to one embodiment, the locking cylinder has at least one additional supplementary tumbler, in order to lock the cylinder core in the locking position relative to the cylinder housing, the further supplementary tumbler being freely movable along a different direction than the aforementioned multiple supplementary tumblers.

According to one embodiment, the key has a shaft, the cross section of which has a longitudinal shape with two broad sides and two narrow sides, with a plurality of primary coding sections which are assigned to the pin tumblers being provided on each broad side, and a plurality of secondary coding sections on each broad side and / or on each narrow side are provided, which are assigned to the supplementary tumblers. The primary or secondary coding sections can be designed as depressions or elevations. When the key is inserted into the locking cylinder, the respective primary coding section of the key can interact with an associated pin tumbler of the locking cylinder in such a way that the associated pin tumbler is moved into its release position in order to release the cylinder core for a rotational movement into the unlocking position. When the key is inserted into the locking cylinder, the respective secondary coding section of the key can also interact with an associated supplementary tumbler of the locking cylinder in such a way that the associated supplementary tumbler is moved into its release position in order to release the cylinder core for a rotational movement into the unlocking position. By using such a key with two broad sides and two narrow sides of the key shaft, it is possible to accommodate the pin tumblers and the supplementary tumblers in the locking cylinder in a particularly simple manner. The key can in particular be of the type of a dimple key.

The primary coding sections and the secondary coding sections can in particular be arranged on the key shaft in a rotationally symmetrical manner (with respect to a rotation of the key shaft about its longitudinal axis by 180 °). In such an embodiment, the key can be inserted into the locking cylinder in two possible rotational positions.

According to one embodiment, the cylinder housing has a hollow cylinder section and a web section extending radially from the hollow cylinder section. In particular, parts of the pin tumblers can be stored in the web section. The cylinder core can have a key channel, which has an elongated cross-sectional shape with a long side and a short side, the long side extending perpendicular to the radial direction of extension of the web section. This embodiment is particularly suitable for arranging the primary coding sections on the broad sides of the key shaft are. The pin tumblers do not necessarily have to run in a central plane of the lock cylinder, but can also be arranged laterally offset from this.

According to one embodiment, the padlock has at least one bolt which locks the bracket on the lock housing in the locking position of the cylinder core. In particular, two bolts can be provided, each of which locks one stirrup leg and / or are movable in opposite directions to one another. The respective bolt can be formed by a locking ball.

According to one embodiment, the padlock has a rotatable driver which is coupled to the cylinder core and which drives the bolt or bolts. In this case, an automatic function can be provided in which the shackle can be locked on the lock housing by being fully inserted into the lock housing while the cylinder core is in the locked position. For this purpose, the driver can, for example, be prestressed into a locking position, the driver being temporarily rotated in the direction of an unlocking position by completely inserting the shackle into the lock housing by means of the bolt (s). An automatic function can also be implemented in that the bolt or bolts is or are prestressed in the direction of their respective locking position. As an alternative to this, a positive guidance can be provided, in which the driver is coupled to the cylinder core in a rotationally fixed manner and also the bolt or bars is or are positively coupled to the driver.

According to one embodiment, the lock housing is made up of several parts, at least one housing part being formed from plastic. Here, for example, a base part can be formed from plastic or from metal.

According to one embodiment, at least one of the bracket elements, sheath of the bracket, bolt or driver is formed from an electrically insulating material, in particular from plastic or ceramic. As a result, further electrical insulation can be effected for use as a lockout padlock.

According to one embodiment, the bracket is essentially U-shaped with a first leg and a second leg, which runs parallel to the first leg and is longer than the first leg. The second leg can serve to permanently secure the bracket to the lock housing, the bracket in its open position can nevertheless be movable.

According to one embodiment, the shackle can assume a closed position, in which the shackle is closed and locked to the lock housing. The shackle can also assume an open position in which the shackle is open and movable, in particular rotatable, relative to the lock housing.

According to one embodiment, the opening movement of the bracket relative to the lock housing is a translatory movement.

According to one embodiment, the cylinder axis runs parallel to the direction of the opening movement of the bracket and / or to the direction of extension of the bracket and / or to the direction of extension of the legs of the bracket.

Fig. 1

zeigt ein Lockout-Hangschloss in einer Explosionsansicht.

Fig. 2

zeigt ein Lockout-Hangschloss in einer Längsschnittansicht.

Fig. 3

zeigt einen Schließzylinder in einer Längsschnittansicht.

Fig. 4

zeigt eine Vorderansicht des Zylindergehäuses des Schließzylinders gemäß Fig. 3.

Fig. 5

zeigt einen weiteren Schließzylinder in einer Querschnittsansicht.

Fig. 6

zeigt ein Lockout-Hangschloss in einer Querschnittsansicht.

Fig. 7

zeigt einen Schlüssel in einer Draufsicht.

Fig. 8

zeigt einen weiteren Schlüssel in einer Draufsicht.

The invention is explained below by way of example only with reference to the drawings. Identical or similar elements are identified therein with the same reference symbols.

Fig. 1

shows a lockout padlock in an exploded view.

Fig. 2

shows a lockout padlock in a longitudinal sectional view.

Fig. 3

shows a locking cylinder in a longitudinal sectional view.

Fig. 4

shows a front view of the cylinder housing of the lock cylinder according to Fig. 3 .

Fig. 5

shows a further lock cylinder in a cross-sectional view.

Fig. 6

shows a lockout padlock in a cross-sectional view.

Fig. 7

shows a key in a top view.

Fig. 8

shows another key in a plan view.

This in Fig. 1 The padlock shown has a lock body 11 and a shackle 13. The shackle 13 has a U-shape with a shorter leg 13 'and a longer leg 13 ". On both legs 13', 13" of the shackle 13 there is an inward-facing locking recess 15 educated. At the free end of the longer leg 13 ", an annular groove 17 is also provided with an abutment head 19 adjacent thereto.

The lock body 11 has a lock housing which has an outer housing 21 and an inner housing 23. The outer housing 21 and the inner housing 23 are made of plastic. The inner housing 23 can be inserted into the outer housing 21 and fixed to the outer housing 21 by means of a locking screw 25. The outer housing 21 and the inner housing 23 house a locking cylinder 27 and a locking mechanism 29, via which the locking cylinder 27 interacts with the bracket 13.

The locking cylinder 27 has a cylinder core 31 with a key channel 33. The cylinder core 31 is inside a hollow cylinder section 32 of a cylinder housing 35 with respect to a cylinder axis A ( Fig. 2 ) rotatably mounted, a rotary actuation should only be possible if an assigned key 55 ( Fig. 2 ) is inserted into the key channel 33. Laterally, the cylinder housing 35 also has a web section 36, which extends radially from the hollow cylinder section 32, for the pin tumblers, which will be explained below. At the rear, the cylinder core 31 has a drive extension 37.

The locking mechanism 29 comprises a driver 39 and two locking balls 41. The driver 39 has a substantially hollow cylindrical shape with an inside engagement projection 43, which enables a rotationally fixed coupling to the drive extension 37 of the locking cylinder 27. On its outside, the driver 39 has two receiving recesses 45 which, when the locking cylinder 27 and thus the driver 39 are actuated, can partially receive the locking balls 41. The driver 39 forms circumferentially adjacent to the receiving recesses 45 locking sections 47, by means of which the locking balls 41 can be held in locking engagement with the locking recesses 15 of the bracket 13.

As for the mutual attachment of the outer housing 21 and inner housing 23, shows Fig. 2 In addition, the fastening screw 25 can cooperate with a nut 49 inserted into the inner housing 23 in a rotationally fixed manner. The fastening screw 25 is inserted into a bracket receiving channel 51 of the outer housing 21, which is closed by the bracket 13 when the bracket 13 - as in FIG Fig. 2 shown - is locked on the lock body 11. The nut 49 is covered by a cover 53. If the locking cylinder 27 is brought into the open position and the shorter leg 13 'of the bracket 13 is removed from the bracket receiving channel 51, the locking screw 25 can be removed from the Nut 49 are loosened to remove the inner housing 23 from the outer housing 21.

This in Fig. 1 and 2nd The padlock shown enables the locking of the bracket 13 in its closed position on the lock body 11 (locking position of the cylinder core 31) or the release of the shorter leg 13 'of the bracket 13 from the lock body 11 (unlocking position of the cylinder core 31), for example, by appropriate actuation of the locking cylinder 27 to be able to insert the bracket 13 in its open position into an eyelet of a switch or to remove it from this. The padlock shown is particularly suitable for use as a lockout padlock.

Fig. 2 shows a state of the padlock, in which the bracket 13 is locked and thus secured against removal from the lock body 11. For this purpose, the locking sections 47 of the driver 39 hold the locking balls 41 in a locking engagement with the locking recesses 15 of the bracket 13. To unlock the padlock, an unlocking rotary actuation by means of an assigned key 55 is required. As a result, the drive extension 37 of the cylinder core 31 and the driver 39 are rotated by 90 °, so that a respective receiving recess 45 of the driver 39 is rotated into the region of the locking balls 41. The locking balls 41 can thus withdraw from the locking recesses 15 of the bracket 13. The shackle 13 can now be pulled axially out of the lock body 11 until the stop head 19 of the longer shackle leg 13 ″ strikes the respective locking ball 41. The shorter leg 13 ′ of the shackle 13 now already protrudes from the lock body 11. The shackle 13 can can now be rotated about the longitudinal axis of the longer stirrup leg 13 ". A new locking of the bracket 13 on the lock body 11 takes place in the reverse order.

Fig. 3 shows a possible embodiment of the lock cylinder 27 of the lockout padlock according to Fig. 1 and 2nd in a longitudinal section, the associated key 55 being inserted into the key channel 33 of the cylinder core 31. The locking cylinder 27 has a plurality of pin tumblers 61 arranged one behind the other along the cylinder axis A, which, in their respective locking position, lock the cylinder core 31 against a rotational movement relative to the cylinder housing 35. The pin tumblers 61 are as shown in FIG Fig. 3 movable in the vertical direction. The pin tumblers 61 each have a housing pin 63 and a core pin 65, and they are spring-loaded in the direction of their locking position by means of a respective compression spring 67. By means of the key 55 inserted into the key channel 33, the pin tumblers 61 are moved from their blocking position against the respective spring load into an in Fig. 3 shown release position moves.

The locking cylinder 27 also has a plurality of additional tumblers 71 arranged one behind the other along the cylinder axis A, which in their respective locking position also lock the cylinder core 31 against a rotational movement relative to the cylinder housing 35. The additional tumblers 71 - in contrast to the pin tumblers 61 - are not spring-loaded, but are freely movable in the cylinder core 31 between their release position and their blocking position. In the embodiment shown, the supplementary tumblers 71 are shown in FIG Fig. 3 also movable in the vertical direction. The additional tumblers 71 are formed in one piece and are relatively short in comparison to the pin tumblers 61. The supplementary tumblers 71 are essentially cylindrical, but both ends have a truncated cone shape.

In their locked position, the additional tumblers 71 engage in a locking recess 73 on an inner circumference of the hollow cylinder section 32 of the cylinder housing 35. As seen from the front view of the cylinder housing 35 Fig. 4 can be seen, the locking recess 73 is formed by a continuous groove extends on the inner circumference of the hollow cylinder section 32 along the cylinder axis A. In the direction of rotation of the cylinder core 31, the locking recess 73 extends on the inner circumference of the cylinder housing 35 along a circumferential angle 75 which essentially corresponds to the width of the respective supplementary tumbler 71, the locking recess 73 being delimited on both sides by a respective guide bevel 77 in the direction of rotation of the cylinder core 31.

Since the supplementary tumblers 71 are freely movably mounted in the cylinder core 31, that is to say are used essentially loosely, the supplementary tumblers 71 can be moved relatively easily between their release position and their blocking position in comparison to the pin tumblers 61. A movement of the respective supplementary tumbler 71 - apart from the use of the key 55 - can thus already be caused by gravity or by vibrations introduced to the lockout padlock from the outside, which can be caused, for example, by vibrations or shocks in the fastening environment of the lockout padlock . The extent to which such external influences actually lead to a displacement of the supplementary tumblers 71 depends on the strength and the frequency of the mechanical vibrations introduced and on the orientation of the lockout padlock relative to the direction of gravity. Since the freely movable and relatively light supplementary tumblers 71 do not necessarily behave uniformly here, the supplementary tumblers 71 can assume slightly different positions, as shown in FIG Fig. 3 is shown.

Thus, one with a lock cylinder 27 according to FIG Fig. 3 provided lockout padlock ( Fig. 1 and 2nd ) through a particularly high level of security against unintentional opening, especially with regard to mechanical vibrations introduced from the outside, which occur in the fastening environment of the lockout padlock, for example due to machine parts that have not been shut down, and which could be transferred to the padlock attached to a switch

(In such a scenario, the key 55 is of course not inserted into the locking cylinder 27, but removed again). Because of their free mobility, the supplementary tumblers 71 can already be moved by relatively weak vibrations between their respective locked position and release position, which means that the supplementary tumblers 71 (earlier than the spring-loaded pin tumblers 61) can start to oscillate between their respective positions when vibrations occur Lock position and release position to move or "jump". This reduces the risk that all tumblers 61, 71 are simultaneously accelerated and moved by external action in such a way that the separating surface between the cylinder housing 35 and the cylinder core 31 is temporarily no longer blocked.

Fig. 5 shows in a cross-sectional view (sectional plane runs perpendicular to the cylinder axis A) that the supplementary tumblers 71 (alternatively or additionally) can also be freely movable in the horizontal direction (based on the representation according to FIG Fig. 5 ), i.e. in a direction perpendicular to the direction of the mobility of the pin tumblers 61. Other relative angles than the 90 ° angle shown are also possible.

Fig. 6 shows in a cross-sectional view (sectional plane perpendicular to the cylinder axis A) an embodiment of a lockout padlock (such as a lockout padlock according to FIG Fig. 1 and 2nd ). In this embodiment, the bracket 13 extends within an extension plane B, which is spanned by the two legs 13 ′, 13 ″ of the bracket 13 Fig. 6 the fastening screw 25 arranged in the axial extension is shown in the right-hand area instead of the leg 13 " Fig. 6 the direction E in which the supplementary tumblers 71 are movable is also shown. This direction E runs at a non-zero angle to the extension plane B of the bracket 13. For example, an angle of approximately 20 °, 25 ° or 30 ° can be provided. In this way it can be achieved that vibrations that affect the outside Brackets 13 and thus transferred to the lock cylinder 27 generally run in a different direction than the direction E of the mobility of the supplementary tumblers 71.

Fig. 7 shows a key 55 which has a key shaft 81, the cross section of which has a longitudinal shape with two broad sides 83 and two narrow sides 85. According to the top view Fig. 7 only one of the two broad sides 83 can be seen, the other broad side 83 being of identical design. The two broad sides 83 can be profiled in a customary manner, that is to say they can be provided with webs and grooves which extend in the longitudinal direction of the key shaft 81. A plurality of primary coding sections 87 are arranged on each broad side 83 in the form of depressions which are assigned to the pin tumblers 61 of the locking cylinder 27. On each broad side 83, a plurality of secondary coding sections 89 are also arranged in the form of depressions which are assigned to the supplementary tumblers 71 of the locking cylinder 27. In their respective release position, the pin tumblers 61 engage in the primary coding sections 87 and the supplementary tumblers 71 engage in the secondary coding sections 89.

Fig. 8 shows a similar key 55, the key shaft 81 of which has two broad sides 83 and two narrow sides 85. A plurality of primary coding sections 87 in the form of depressions for the pin tumblers 61 are in turn arranged on each broad side 83. A plurality of secondary coding sections 89 in the form of lateral notches for the additional tumblers 71 are also arranged on each narrow side 85.

With the respective key 55 according to 7 and 8 the primary coding sections 87 and the secondary coding sections 89 are arranged on the key shaft 81 in a rotationally symmetrical manner (with respect to a rotation of the key shaft 81 about its longitudinal axis by 180 °). The key channel 33 of the associated lock cylinder 27 can correspond to the cross-sectional shape of the Key 55 has an elongated cross-sectional shape with a long side and a short side, the long side in particular perpendicular to the radial extension direction of the web portion 36 of the cylinder housing 35 according to Fig. 4 can run.

Reference symbol list

11

Lock body

13

hanger

13 '

leg

13 "

leg

15

Locking recess

17th

Ring groove

19th

Stop head

21

Outer housing

23

Inner casing

25th

Locking screw

27th

Locking cylinder

29

Locking mechanism

31

Cylinder core

32

Hollow cylinder section

33

Key channel

35

Cylinder housing

36

Web section

37

Drive extension

39

Carrier

41

Locking ball

43

Intervention approach

45

Receiving recess

47

Locking section

49

mother

51

Strap receiving channel

53

cover

55

key

61

Pin tumbler

63

Housing pin

65

Core pin

67

Compression spring

71

Supplementary guard locking

73

Barrier recess

75

Circumferential angle

77

Leading slope

81

Key shaft

83

Broadside of the key shaft

85

Narrow side of the key shaft

87

Primary coding section

89

Secondary coding section

A

Cylinder axis

B

Extension plane B of the bracket

E

Direction of the mobility of the supplementary tumblers

Claims (13)

1. A padlock (63) for securing a switch (61) of an industrial plant, in particular a lockout padlock,
   having a lock housing (21, 23) composed of plastic, a hoop (13) which is displaceably held at the lock housing (21, 23), a lock cylinder (27) which is arranged in the lock housing (21, 23) and which has a cylinder housing (35) and a cylinder core (31) which is rotatable about a cylinder axis (A) in the cylinder housing (35), and having a key (55), wherein the cylinder core (31) is rotatable by means of the key (55) between a locked position in which the hoop (13) is locked or lockable to the lock housing (21, 23) and an unlocked position in which the hoop (13) is released for an opening movement relative to the lock housing (21, 23),
   wherein the lock cylinder (27) has a plurality of tumblers, with each tumbler being movable between a respective release position in which the tumbler releases the cylinder core (31) for a rotation into its unlocked position and a respective blocking position in which the tumbler blocks the cylinder core in its locked position relative to the cylinder housing (35); and
   wherein the plurality of tumblers comprise a plurality of pin tumblers (61) which are spring-loaded in the direction of their respective blocking positions,
   characterized in that
   the plurality of tumblers furthermore comprise a plurality of supplementary tumblers (71) which are not spring-loaded and which are freely movably supported between their respective release positions and their respective blocking positions.
2. A padlock in accordance with claim 1,
   wherein the supplementary tumblers (71) are cylindrical or substantially cylindrical.
3. A padlock in accordance with claim 1 or claim 2,
   wherein the supplementary tumblers (71) are formed in one part.
4. A padlock in accordance with any one of the preceding claims,
   wherein the supplementary tumblers (71) are formed as shorter than the pin tumblers (61) along their respective direction of movement.
5. A padlock in accordance with any one of the preceding claims,
   wherein the supplementary tumblers (71) are supported in the cylinder core (31) and engage in their respective blocking positions into a blocking recess (73) at an inner periphery of the cylinder housing (35).
6. A padlock in accordance with claim 5,
   wherein the blocking recess (73) extends at the inner periphery of the cylinder housing (35) along a peripheral angle (75) in a direction of rotation of the cylinder core (31), said peripheral angle (75) substantially corresponding to the width of the respective supplementary tumbler (71), with the blocking recess (73) being bounded in the direction of rotation of the cylinder core (31) by at least one guide chamfer (77).
7. A padlock in accordance with any one of the preceding claims,
   wherein the supplementary tumblers (71) are movable within a respective plane which is perpendicular to the cylinder axis (A).
8. A padlock in accordance with any one of the preceding claims,
   wherein the supplementary tumblers (71) are arranged behind one another along the cylinder axis (A).
9. A padlock in accordance with any one of the preceding claims,
   wherein the hoop (13) extends within a plane of extent (B), with the direction in which the supplementary tumblers (71) are movable extending at an angle different from zero to the plane of extent (B) of the hoop (13).
10. A padlock in accordance with any one of the preceding claims,
    wherein the direction of movement of the pin tumblers (61) and the direction of movement of the supplementary tumblers (71) extend in parallel with one another or at an angle different from zero.
11. A padlock in accordance with any one of the preceding claims,
    wherein the pin tumblers (61) have a respective housing pin (63) and a respective core pin (65), with the housing pin (63) being substantially supported in the cylinder housing (35) and the core pin (65) being substantially supported in the cylinder core (31).
12. A padlock in accordance with any one of the preceding claims,
    wherein the key (55) has a shaft (81) whose cross-section has a longitudinal shape having two broad sides (83) and two narrow sides (85), with a plurality of primary coding sections (87) which are associated with the pin tumblers (61) being provided at each broad side (83), and with a plurality of secondary coding sections (89) which are associated with the supplementary tumblers (71) being provided at each broad side (83) and/or at each narrow side (5).
13. A padlock in accordance with any one of the preceding claims,
    wherein the cylinder housing (35) has a hollow cylinder section (32) and a web section (36) extending radially from the hollow cylinder section (32), with the cylinder core (31) having a keyway (33) which has an elongate cross-sectional shape having a long side and a short side, with the long side extending perpendicular to the radial direction of extent of the web section (36).

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