EP0175211B1 - Socket spanner actuated and arrested by a sash lock - Google Patents

Description

The invention relates to a lockable cam lock that can be actuated by a key, with a lock core that can be actuated, rotatably and lockably mounted in a lock housing, the lock core consisting of a front section for receiving the socket key, a fuselage or middle section and a prismatic foot or rear section, a locking element with grooves or shoulder for locking the locking element when the key is removed on the front section of the closing core against pressure loading of a compression spring arranged around the middle part of the closing core is arranged so as to be movable.

Such a sash lock is already known in the form of a window locking device from US-A-3 907 348, from which the preamble of the independent claim is based, see FIG. 3 and column 3, 1st and 2nd paragraph.

The actuating shaft holding the sash tongue is mounted in a housing which is screwed onto the outer surface of the window frame and does not extend into the material of the frame. On the one hand, this sash lock protrudes too far into the room and on the other hand it does not give the actuating shaft near the sash tongue any lateral hold is attached. This places a heavy load on this plate, which also forms the bearing for the actuating shaft.

Cam locks for door applications with housings that can be pushed through the door leaf have also become known, which therefore have a higher stability and - since parts of the lock can be moved into the door leaf or into the space behind the door leaf - less far forward over the door leaf protrude. Such cam locks which can be pushed through housings are used in particular for electrical control cabinets, but also for cabinets in the food industry, with multiple locks which are actuated by means of double-bit keys or polygonal mandrel keys, in particular square mandrel keys, often used to lock a cabinet door. In many applications, such as in crane systems, excavator equipment, mixing devices, mills, etc., the control cabinet doors and their locks are subject to strong vibrations and vibrations, which lead to an unwanted and often dangerous opening of the cabinet door, especially the control cabinet door, when the locks are not secured. Another problem arises when a key catch for the lock is used, which serves to prevent or at least make it more difficult for unauthorized persons to open such doors by means of keys and tools that are not intended to open the door. The key catch has an opening adapted to the cross section of the key and thereby makes it difficult to insert keys or tools with a different profile shape or even makes this impossible.

For the cell doors or cabinet doors of electrical switchgear, for example, double-bit keys of certain dimensions are provided in accordance with the German standard, which have two opposing key bits and an axial bore each of standardized dimensions. These double-bit keys include a keyhole which is also standardized in terms of its dimensions and which is formed, for example, by the key catch.

With locks of this type, the problem arises with vibrating load that the actuating shaft of the lock, which at its end has corresponding depressions to be grasped by the key beards, is due to being in the locked or unlocked position, that is to say that these depressions are related to the Breaks in the keyhole are not exactly aligned. In this case it is not possible to insert the double bit key. It must first be achieved in a cumbersome manner with auxiliary tools that the depressions to the openings in the keyhole are again exactly aligned before the double-bit key (or polygonal mandrel key or the like) can be inserted.

Such unwanted shifts can also occur due to vibrations, e.g. caused by the devices arranged inside the control cabinets, or also by the transportation of the cabinets, e.g. when transporting control cabinets from the factory to the installation site on trucks. At the installation site, the locks have often shifted a bit and the locks can no longer or not easily be opened with the key provided for them, which is very annoying for the user.

Lockable sash lock operated cam locks with push-through housings have therefore been developed which prevent such undesired displacements in the event of vibrations. For example, US-A-36 61 001 shows a locking device which can be actuated by a key, and US-A-39 95 463 also discloses such a locking device of somewhat different construction. The constructions known from these two publications, however, have the disadvantage that the overall length, based on the diameter of the housing body to be inserted through the door, is still relatively large, in the case of US Pat. No. 3,661,001 it is 1.7 times, in the case of the US -A 39 95 463 even 1.9 times this diameter, if one or the like for fastening the sash. required screw is not taken into account. Such large lengths Regarding the housing diameter, however, they are not particularly well suited for sash locks, because with these locks there is usually very little axial space between the door to be locked and the sash lock arrangement, such as the German utility model 76 21 270.9, which shows such a sash lock, clearly can be. The cited documents also do not show how the overall length can be significantly reduced by changing the construction shown there.

Another disadvantage of the above-mentioned construction is that the locking device and the associated key catch are constructed in such a way that the key is inserted in two stages. During the first stage, a key wiper must first be pushed back (see US Pat. No. 3,661,001) against the force of a first spring until it reaches a flange that is prestressed by a second, stronger spring. With the second stage now starting, the key must be pushed further inward against the force of the second spring until the locking device is unlocked. An operator who is unfamiliar with this two-stage procedure will assume that after the first stage has been completed the unlocking has been reached and attempt to open the lock by turning the key and possibly damage the locking device in the process. The operator cannot visually recognize when the lock is released, but rather has to determine this by "feeling". The US-A 39 95 463 shows very similar relationships, even if the shape of the key may give a visual indication that the unlocked position has been reached. However, premature opening attempts must also be taken up by the locking device here. A further disadvantage is that the key can be removed in any position and is even forced out by the spring force when released.

Improved in this respect is a locking device which is described in the applicant's EU-A 00 36 141. In particular, the ratio between the axial length (without tongue fastening screw) and the radial diameter of the push-through part of the housing is considerably reduced, in addition, the construction enables a key catch without increasing the length, which holds the key in intermediate positions, gives the user a visual indication of the position of the locking device and at the same time, secure the key against rotation as long as the locking device is not unlocked (so that the locking device is not loaded by key actuation torque forces).

The overall length of this known locking device with respect to the push-through housing diameter is only 1.4 to 1.6 times. In addition, the arrangement enables the key to be held in intermediate positions, it is only necessary to insert the key in one step, and the operator can also see whether the key bit is still in the key catch and is not frustrated by unsuccessful attempts to turn it, which would also unnecessarily stress the locking device . If the operator nevertheless tries to turn the key prematurely, the more robust key catch absorbs the torque, not the sensitive (since smaller) locking device in the lock. Since the locking device is released in front of the key bit, there is basically no risk that the locking device will be burdened by incorrect operation. It just has to be shaken and the like. Prevent occurring rotary movements.

However, this already very advantageous fastener can be improved even further. It has been shown that the infiltration or ring indentation required for the connection of the sash is still too unsafe in some applications, especially since it has to absorb the full closing load transmitted by the sash. During operation, it also emerged that, especially in poor lighting conditions and inexperienced operators, it is not immediately apparent how the locking works. This can have an unfavorable effect, especially in emergency situations. In addition, problems arise when a triangle or square is to be used as the key, since then there is no undercut.

Finally, the latter, as well as the first two described and the cam lock of the type mentioned at the outset, tends to collect dirt and dust in its front area.

In addition, with regard to US Pat. No. 3,907,348, from which the subject matter of the invention is based, reference is also made to its FIGS. 3 and 5, where a safety lock for a window is shown, which can be actuated by means of a special key. The lock can be locked in two positions, for which purpose a compression spring presses a locking element, which has four radial recesses offset by 90 °, on the front locking shaft end which holds the key, and which axially slides against the key catch and locks into corresponding inner projections. Otherwise, this closure has little in common with the closure of the type mentioned at the outset, in particular it does not have its own closure housing and is therefore in the area of application which is the focus here, namely in particular as a rod lock for e.g. electrical cabinets, not applicable. It is also not recognizable that suggestions for the subject matter of the invention can be obtained from this closure.

It is an object of the invention to provide a lockable cam lock of the type mentioned at the beginning while maintaining the advantages which it has over older designs NEN, especially when used in a bar lock, to be further improved in such a way that the structural cohesion is even better and the closure is thus even more resilient - without complicating the assembly - that the type of operation is even easier to recognize, and that the cam lock in particular can no longer collect dirt and dust in its front area.

The object is achieved by the characterizing features of the main claim, that is, in that the compression spring arranged in or around the center piece is supported on the one hand in an annular groove arranged at the transition from the center piece to the foot, and on the other hand in a groove or shoulder arranged in a locking element, which Locking element has a contour adapted to the contour of the key bit and can be snapped into a mask adapted to the shape of the locking element, which has a breakthrough that allows the key bit in at least one key position as well as axially and / or radially extending grooves or projections for locking the locking element when the key is removed having.

These features reduce the overall length even further, the usual length of non-lockable sash locks is practically achieved, and the operation has been significantly improved, since it is immediately apparent how the lock is to be unlocked, namely by «inserting something» . The fact that the lock has no recessed areas when the key is removed also reduces the risk of dirt and dust being deposited in the front area of the lock, which is of great advantage in the food industry.

Another advantage can be seen in the fact that the problems that occur in the prior art when using square keys do not occur here. In the prior art, the use of square (or other prismatic key shapes) was problematic because they work without an undercut and thus impair the locking principle.

A mechanical improvement is achieved in that the mask forms a bearing for the head when the key is removed, which transfers lever loads to the housing from the sash tongue. It is also favorable that, apart from an embodiment provided for a rod lock, the axis-tongue unit remains firmly in the bearing and the lock therefore remains functional, even if the locking device in the form of the combination of mask and locking element is defective. In the prior art, the lock disintegrates when the lock falls out, while the basic function of the lock is retained here.

When using double-bit keys, the mask can have a single double slot, which means that the key cannot be removed when the lock is open, but with the disadvantage that the lock has to be designed differently for right-hand and left-hand operation.

However, if the key is to be removable when the lock is open, which is useful, for example, if several locks on a door leaf are to be opened with just one key, the mask can be given two mutually perpendicular double slots, which has the further advantage that it can then be used right and left-hand operation is possible with a single locking construction.

The type of attachment of the mask used according to the invention can be different, the mask advantageously having further projections axially pointing into the interior of the housing for anchoring the mask in the housing end face in a rotationally rigid manner. For example, the mask can be held or formed by a sheet metal cap that encompasses the outer edge of the key catch. Alternatively, the mask can also be glued, caulked or firmly pressed into the key catch. When used for a bar lock, the sash tongue is omitted (this may be formed by the bar lock), instead the lockable lock is inserted into the bar lock nut. In this application, the mask can be made in one piece with the cam lock housing and the locking core can rest against the lock nut or a housing part of the rod lock.

In particular, the locking core can protrude with its center piece beyond the rear end of the lock housing, which is cut off smoothly here, and can be rotatably supported with the protruding part in the rod lock housing and / or be accommodated in the lock nut. This represents a particularly simple and space-saving combination between the closure according to the invention and a rod lock. In accordance with yet another embodiment, if a seal is desired, the center piece can radially spring back shortly before the cut end of the closure housing, as a result of which an annular space is formed between the center piece and the housing wall in which an O-ring seal can be arranged.

In the case of particularly frequent use for double-bit keys, it is particularly favorable if the middle piece carries an axially arranged mandrel which extends forward into the mask, which forms a head aligned with the front face of the mask, and which slides on itself the locking element which, when removed The key is placed on the head in such a way that its front face is aligned with the mask front face and head front face.

With such a construction, it is particularly expedient if the mandrel is pressed into an axial blind bore located in the center piece after the locking element and compression spring have been pushed over.

The invention is based on Exemplary embodiments explained in more detail in the drawings.

• Fig. 1 in einer Axialschnittansicht einen erfindungsgemäss ausgestalteten, steckschlüsselbetätigbaren und arretierbaren Vorreiberverschluss;
• Fig. 2 einen zugehörigen Doppelbartschlüssel in Seitenansicht und Draufsicht;
• Fig. 3 eine Draufsicht auf den Verschluss der Fig.1;
• Fig. 4 bis 9 Einzelteile des in Fig. 1 dargestellten Verschlusses, teilweise in unterschiedlichen Ansichten;
• Fig. 10 eine andere Ausführungsform des steckschlüsselbetätigbaren arretierbaren Vorreiberverschlusses gemäss der Erfindung wiederum in einer Axialansicht, jedoch hier mit demontierter (nicht dargestellter) Vorreiberzunge;
• Fig. 11 einen zugehörigen Vierkantschlüssel;
• Fig. 12 bis 15 wiederum Einzelteile des in Fig. 10 dargestellten Verschlusses in teilweise unterschiedlichen Ansichten;
• Fig 16 die Anwendung des erfindungsgemässen Vorreiberverschlusses bei einem Stangenschloss, wobei der Vorreiberverschluss gemäss einer ersten Ausführungsform (obere Hälfte der Fig. 16) und einer zweiten Ausführungsform (untere Hälfte der Fig. 16) abgewandelt ist;
• Fig. 17 eine dritte Ausführungsform zur Anwendung bei einem Stangenschloss;
• Fig. 18 einen zugehörigen Doppelbartschlüssel in Seitenansicht und Draufsicht;
• Fig. 19 das Verschlussgehäuse der Ausführungsform gemäss Fig. 17 in einer Schnittansicht (links) und in einer Ansicht von vorn (rechter Teil der Fig. 19);
• Fig. 20 in einer Schnittansicht (Mitte) sowie einer Ansicht von vorn (links) und hinten (rechts) den Schliesskern des Verschlusses gemäss Fig. 17;
• Fig. 21 den in den Schliesskern einpressbaren Dorn einer Seitenansicht und in einer Ansicht von hinten; und
• Fig. 22 das zugehörige Sperrelement in einer Schnittansicht (rechts) und in einer Ansicht von vorn (links).

It shows:

• 1 is an axial sectional view of a cam lock which is designed and can be actuated and locked according to the invention;
• 2 shows an associated double-bit key in side view and top view;
• 3 shows a plan view of the closure of FIG. 1;
• 4 to 9 individual parts of the closure shown in FIG. 1, partly in different views;
• 10 shows another embodiment of the lockable lockable cam lock according to the invention, again in an axial view, but here with the cam lock tongue removed (not shown);
• 11 shows an associated square key;
• 12 to 15, in turn, individual parts of the closure shown in FIG. 10 in partially different views;
• 16 shows the use of the sash lock according to the invention in a rod lock, the sash lock being modified according to a first embodiment (upper half of FIG. 16) and a second embodiment (lower half of FIG. 16);
• 17 shows a third embodiment for use with a bar lock;
• 18 an associated double-bit key in side view and top view;
• FIG. 19 the closure housing of the embodiment according to FIG. 17 in a sectional view (left) and in a view from the front (right part of FIG. 19);
• 20 shows a sectional view (middle) and a view from the front (left) and rear (right) of the closing core of the closure according to FIG. 17;
• 21 shows the mandrel that can be pressed into the closing core in a side view and in a view from the rear; and
• 22 the associated locking element in a sectional view (right) and in a view from the front (left).

1 shows a lockable cam lock according to a first embodiment of the invention that can be actuated and locked in an axial sectional view. The cam lock 10 comprises a cylindrical housing 12 which ends in a key catch 14, the housing 12 carrying a thread on its cylinder outside in order to be able to fix the housing by means of a nut 16 within an opening in the door leaf. The housing is shown again as an individual part in FIG. 6, namely in an axial sectional view (FIG. 6a), in a view from below (FIG. 6d) and in a side view (FIG. 6b), with FIG. 6b and 6d that the housing has a flattened area 18 on at least one side, which works together with a corresponding tendon-like projection of the punched hole in the door leaf in such a way that there is a rotation lock. Fig. 7 shows the housing from above. It is also possible to provide two such flats lying opposite one another or also four such flats, each at a distance of 90 ° to one another, if the housing is e.g. two or four different rotated positions should be mountable. 6d, a view from below of the housing, shows an embodiment with four such flats 18.

A locking core or a locking shaft 20 is rotatably arranged within the housing 12 of the cam lock 10, the locking core 20 consisting of a front section 78 for receiving the socket key 46, a fuselage or center section 24 and a prismatic, in particular square foot or rear section 26, that has at its end facing away from the front section 78 an axial, threaded depression such as a threaded blind hole 28, into which a fastening screw 30 for the sash tongue 32 is received. A locking element 22, which is shown as an individual part in FIG. 5, is arranged on the front section 78 of the closing core 20 in a rotationally rigid but axially sliding manner, in the embodiment shown here in that the locking element 22, which has the shape of a ring 34, has two noses 36 pointing radially away from this ring, which are slidably received in corresponding incisions 38 of the closing core 20. In the embodiment shown in FIGS. 10 to 15, the blocking element 122, on the other hand, has a prismatic, namely square opening 137 which slides on a correspondingly contoured part of the front section 138. A compression coil spring 40, shown in FIG. 4, is arranged around the closing core 20 in such a way that it results in the compression spring load for the locking, the compression coil spring 40 being supported on the one hand on an annular shoulder 42 formed by the rear section 126 and on the other the front section slidingly arranged locking element 22, which has a contour adapted to the key bit. Compare, for example, the contour of component 22 shown in FIG. 5 and the component designed to match it in accordance with FIG. 8 with the associated double-bit key of FIG. 2, or also the contour of component 122 in FIG. 15 (in connection with component 124 12) with the corresponding square key, which can be seen in FIG.

In order to implement the actual locking, a mask 44 is provided, see a plan view in FIG. 9a and a side view in FIG. 9b, which in the middle at least shows the key bit 46 in its respective shape, for example the double bit shape shown in FIG. 2 has a breakthrough 48 that allows a key position, but can also have, for example, such a breakthrough that the key bit 46 can be inserted in two mutually perpendicular positions, as is also shown in FIG. 9.

This mask 44 also has axial in the Protrusions 50 on the inside of the housing, which make it possible to insert the mask on the end face, that is to say from the front, into a corresponding depression 52, with recesses 54 starting from the depression 52 ensuring rotational rigidity at the locations of the protrusions 50, see FIGS. 6a and 6a 9b.

This mask 44 is prevented from falling out axially by a sheet metal cap 56 (FIG. 6c), as shown in FIG. 1, and after assembly of the parts shown in FIGS. 8, 4, 5 and 9 only this sheet metal cap is visible from the end 56 placed on the key catch 14 of the housing 12 and the lower free end 58 needs to be flanged in a corresponding recess 60 on the support surface of the housing key catch on the door leaf, as in FIG. 6 in the preparatory position and in FIG. 1 in the end position is recognizable. It is clear that the mask does not have to be fastened by means of a sheet metal cap of this type, even if this represents the aesthetically particularly favorable embodiment. Alternatively, the mask could also be glued, caulked or otherwise firmly pressed into its bed formed by the key catch. It can even be in one piece with the sheet metal cap. In this case, the mask could not be locked against rotation.

In addition to the particularly simple assembly process already described, the embodiment shown in FIGS. 1 to 8 also has the particular advantage that operation is particularly simple and clear: First, the key, here according to FIG. 2, becomes a double-bit key through the one from the sheet metal cap 56 circularly kept free area 61 (Fig. 3) until it reaches the mask 44 with the locking element 22 held in the mask profile 62 by spring force. In this locked state, the front end face 64 of the blocking element 22 lies slightly behind the front end face 66 of the mask 44, as can be seen from FIG. 1. The operator therefore immediately recognizes the one position (or here the two positions) in which the double-bit protrusions of the double-bit key 46 no longer rest on the mask 44 but on the blocking element 22. In this position, the key 46 can be pushed into the lock, because the locking element 22 can retract in its axial guidance, formed by the component 20 of FIG. 8, by compressing the spring 40. At the same time, the two beards of the key penetrate into the slot 38 formed by the component 20. As soon as the double bit of the key comes out of the mask 48, this key can be turned and takes the parts 22 and 20 with it, ie the locking element and the locking core or the locking shaft. With the closing shaft 20, however, the sash tongue 32, which is placed on its prismatic end 68 and held with the fastening screw 30, also rotates.

The spring 40 is supported within an annular groove 42 with such a depth that it can be fully pressed into it. This has the advantage that there is a defined stop position for the double-bit key 46 on the contact surface 70 of the closing core 20, so that the operator notices without problems at which point it is no longer necessary to push in, but instead can be turned. This clear stop position is not available in the prior art.

After turning for example 90 ° (this may correspond to the open position), the key can be removed again in the contour mask 44 shown in FIG. 9. However, if the key is not to be removable in this position, the mask will not be provided with the cruciform profile 62 shown, but only with a mask profile which essentially corresponds to the profile of the double-bit of the key 46.

The closing core or the closing shaft 20 also has the advantage that it has a shaft guide near its two ends, which, despite the very short overall length, results in a stable guide of the closing shaft with the sash tongue attached to it. On the one hand, there is a closing shaft bearing in the area of the fuselage or middle piece, in particular in the closed circular peripheral area 70, see FIG. 8, which is supported within the housing 10 in the area of its inner wall 72, see FIG. 6a. A further guide is provided by the stub shaft region 74, which is formed in the corresponding opening 76 in the housing 10. Finally, however, the upper end 78 of the closing shaft 78 is also guided, namely in that this upper end 78 can be supported in the blocking element 22, which in turn is supported in the radial state by the mask 44 in the idle state, while in the working position (at inserted key) this function is taken over by the key. Exact guidance in the rest position is particularly important, since this determines the freedom from play of the locking effect. The locking element 22 is guided within the mask via the two side surfaces 80 and 82 of the projecting lugs 36, which are aligned with the tongue 32 in the construction shown here and therefore have leverage effects on the mask and thus on the housing, which proceed from the tongue 32 can transmit.

It should be added that in the usual way the housing can form rotation limit stops 84, 86 for a stop lug 88 starting from the tongue 32.

The cam lock according to the invention can also be made gas-tight without difficulty, for example by the arrangement of an O-ring seal 90, which can be accommodated in a shoulder-like recess 92 in the middle piece 24.

The embodiment shown in FIGS. 10 to 15 is constructed essentially according to the same principle, but adapted to a square key 146, as shown in FIG. 11 represents is. When this key 146 is inserted, its front end first pierces the sheet metal cap 56 placed around the key catch 14 and holding the mask 144, then engages with the locking element 122 in a sliding manner and at the same time engages around the prismatic end 138 of the locking core 120 (see FIGS. 12 and 15 ). Against the force of the spring 40, the key moves the locking element 122 downward and in doing so presses the projections 136 of the locking element 122 out of corresponding grooves 162 of the mask profile of the mask 144, see FIG. 14. As soon as the locking element 122 comes out of the mask 144, but at the latest then, when the key end 94 reaches the support surface 96 formed by the locking core 129, the operator will be able to turn the locking core or the locking shaft 120 by the desired angle of rotation of 90 °, for example, and can remove the key again, again locking by engaging the projections 136 of the blocking element 122 in the grooves 162 of the mask 144 is reached.

Here, too, the same favorable closing shaft guides are achieved at three points, and a seal must also be accommodated here without space problems, although the overall construction of the lockable sash lock is no larger than that of the usual non-lockable sash locks.

In Fig. 16 it can be seen how the closure according to the invention when used with a rod lock, such as e.g. is shown in EU-PS 0 036 141, can be configured. Since here the rod lock 110 takes the place of the tongue 32, the axial tensile forces directed away from the front face of the housing, which otherwise result from the tongue in the closed position, are eliminated. The rod lock 110 can also absorb such forces coming from the compression spring 40 of the locking device, since it is usually rigidly attached to the door leaf 118. At the same time, the rod lock 110 forms a rear bearing for the lock 10, so that the narrowed opening 76 of the lock housing 14, which normally forms an axial stop for the lock core 20, is no longer necessary here, so that the lock housing 10 is freely accessible from the rear , the stop now being formed by the housing 114 of the rod lock 110 or by the lock nut 125. The closure 10 can thus be assembled from behind and the mask 44 can be injection molded or cast in one piece with the closure housing 20 here. This improves the appearance and enables even cheaper manufacturing.

16 shows an embodiment in which the bar lock 110 is fastened to the door leaf 118 via a shackle or relining 112 by means of welding or screwing 121. The relining 112 is fastened to the door leaf 118 by means of the fastening nut 16. As a result of the relining 112, there is a certain distance between the door leaf front surface and the front surface 127 of the lock nut 125, to which front surface 127 the closing core can axially rest, while the torque is transmitted from the prismatic foot 16 of the closing core to the nut 125, which has a corresponding opening 128 having.

The breech housing can spring back a little in relation to the closing core contact surface (see reference number 130 in FIG. 16) or lie against a non-movable housing part of the rod lock (see reference number 132). An O-ring seal can again be provided in a shoulder-like recess, see reference number 123.

FIG. 17 shows yet another embodiment, also for use with a bar lock 110. The embodiment shown here is particularly suitable for double-bit keys and therefore has a similar structure to the embodiment according to FIGS. 1 to 9. Here too, the mask which bears the reference number 244, in one piece with the sash lock housing 12 and the locking core 220 lies against the lock nut 125 or is even included in a corresponding depression in the lock nut for further space saving. As a result, the closing core 220 projects with its middle piece 24 beyond the rear, smoothly cut end 45 of the lock housing 12, so that the projecting part 47 of the middle piece 24 can be rotatably mounted in the rod lock housing, or else, as shown in FIG. 17, in FIG the lock nut 125 is receivable.

Here too, for sealing purposes, the middle piece can spring back radially shortly before the cut end 45 of the closure housing 12 and thereby form an annular space between the middle piece 24 and the housing wall, in which annular space an O-ring seal can be arranged.

The middle piece 24 has an axially arranged mandrel 178 which extends forward into the mask 44 and which is still shown in FIG. 21, which mandrel has a head 180 aligned with the front face of the mask and which slides on the locking element 222 (see FIG . 22) which, when the key is removed, rests against the head 180 (due to a corresponding shaping of the opening in the mask, see the right representation of FIG. 22) in such a way that its front face 180 is flush with the mask front face 184 and head face face 186, as in 17 can be clearly seen. Although the head of the mandrel 178 could only be formed after the introduction of the spring and the locking element 122 (for example by compression or the like), it is easier if the mandrel 178 is pressed into an axial blind bore 188 located in the center piece 24 after the Spring 40 and the locking element 22 have been pushed over.

Claims (16)

1. Key-operated rotary latch (10) capable of being arrested, having a latch core (20) capable of being actuated in a latch housing (12), and supported so as to be capable of being rotated and arrested, the latch core (20) comprising a front part piece (78) to receive the key (46), a body or middle piece (24) and a prismatic foot or rear part piece (26), a blocking element (22) having slots or shoulders to arrest the blocking element (22) with the key withdrawn being positioned so as to be capable of being moved by sliding on the front part piece (78) of the latch core (20) against pressure of a compression spring (40) arranged around the middle piece of the latch core (20), characterised in that the compression spring (40) arranged around the middle piece (24) is supported on the one hand in a circular slot (42) arranged at the transition from the middle piece (24) to the foot (26), on the other hand in a slot or shoulder (43) arranged in the blocking element (22), which blocking element (22) has a contour matched to the contour of the key bit (46), and is capable of being engaged in a mask (44) matched to the shape of the blocking element (22), which mask has an opening (48) which allows the key bit (46) through in at least one key position as well as slots (62) running axailly and/or radially or projections to arrest the blocking element (22) with the key withdrawn.

2. Rotary latch as claimed in claim 1, characterised in that the mask (44) with the key (46) withdrawn forms for the blocking element (22) a support that diverts leverage loads emanating from the rotary tongue (32) to the housing (12).

3. Rotary latch as claimed in claim 1 or 2, characterised in that the facing surface of the mask (44) is in alignment with the key holder facing surface, or recoils only slightly relative to the latter, and that the facing surface of the blocking element (22) with the key (46) withdrawn is in alignment with the facing surface of the mask (44) or projects only slightly relative to the latter (in the case of internal face keyd, such as square keys) or recoils only slightly relative to the latter (in the case of bit keys, such as double bit keys).

4. Rotary latch as claimed in one of claims 1 to 3, characterised in that the middle piece (24) at the transition to the foot (26) has a circumferential recoil (92) to receive an 0-ring seal (90).

5. Rotary latch as claimed in one of claims 1 to 4, characterised in that the circular slot (42) for the compression spring (40) has a depth sufficient to fully accommodate the compression spring (40) in the compressed state.

6. Rotary latch as claimed in one of claims 1 to 5, characterised in that for double bit keys (46) the mask has a double slot or two double slots arranged perpendicularly to each other.

7. Rotary latch as claimed in one of claims 1 to 5, characterised in that for internal face keys with symmetrical polygonal profile the number of likewise symmetrically arranged locking slots (162, Fig. 14) is equal to the number of internal faces.

8. Rotary latch as claimed in one of claims 1 to 7, characterised in that the mask has further projections (50) pointing axially into the interior of the housing to anchor the mask (44) non-rotatably in the housing facing surface (52,54).

9. Rotary latch as claimed in one of claims 1 to 8, characterised in that the mask (44) is held by a sheet-metal cap (56) which grasps the outer edge of the key holder (14).

10. Rotary latch as claimed in one of claims 1 to 8, characterised in that the mask (44) is glued, wedged, or pushed securely into the key holder (14).

11. Rotary latch as claimed in one of claims 1 to 8, characterised in that the mask (44) is formed from a cap (56) grasping the outer edge of the key holder (14).

12. Rotary latch as claimed in one of claims 1 to 7, for use in a bar lock, characterised in that the mask (144) is of a single piece with the rotary latch housing (12), and that the latch core (120) abuts against the lock follower (125) or a housing part of the bar lock (Fig. 16).

13. Rotary latch as claimed in claim 12, characterised in that the latch core (220) projects with its middle piece (24) beyond the rear, smoothly cut off end (45) of the latch housing (12) and with the projecting part (47) is rotatably supported in the bar lock housing and/or accommodated in the lock follower (25) (Fig. 17).

14. Rotary latch as claimed in claim 13, characterised in that the middle piece (24) recoils radially shortly before the cut off end (45) of the latch housing (12), and that in a circular space thereby formed between middle piece (24) and housing wall an 0-ring seal is arranged.

15. Rotary latch as claimed in one of claims 12 to 14, for double bit keys (46), characterised in that the middle piece (24) carries an axially arranged pin (178) extending forwards into the mask (144), having a head (180) in alignment with the mask front surface, and carrying sliding on it the blocking element (222), which with the key (46) withdrawn abuts against the head (180) in such a way that its front facing surface (182) is in alignment with the mask front surface (184) and the head front surface (186).

16. Rotary latch as claimed in claim 15, characterised in that the pin (178) is pressed into an axial blind hole (188) located in the middle piece (24) after pushing over the blocking element (222) and the compression spring (40).

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