DE202008016838U1 - blow - Google Patents

Abstract

contraption for forming plastic preforms into containers with at least one blow mold (1) for receiving the plastic preforms, wherein this blow mold (1) has two mold parts (3, 4), which with respect to are pivotable about a connecting axis (2), with at least a locking element arranged on one of the molded parts (3, 4) (9), which with at least one on the other molding (4, 3) arranged counter-element (10a, 10b, 72) cooperates to the two Molded parts (3, 4) to lock against each other, wherein the counter-element (10a, 10b) around one substantially parallel to the connection axis (2) arranged axis (Y, Y ') arranged counter element (10a, 10b) which is between a locking position in which the blow mold is locked, and a unlocking position in which the blow mold can be opened, is rotatable, the counter element (10a, 10b) is such that the counter element (10a, 10b) in the locking position at least partially on the locking element (9) and in the unlocked position, the locking element (9) releases, thereby ...

Description

The The present invention relates to a device for forming from plastic preforms to plastic containers. Such devices are known in the art for a long time are known and usually have a variety of blowing stations in which blow molds are arranged at these blowing stations, in the interior of which the plastic preforms are arranged, for example expanded by compressed air to plastic containers to become.

such Blow molds usually have two mold halves on that can be opened and closed, to accommodate the plastic containers in their interior.

While the actual expansion process are doing this form halves locked against each other, so that they during the can not open the actual forming process.

From the US 7,384,261 B2 For example, a blowing device for producing thermoplastic containers is known. In this device, a locking mechanism is provided to lock two blow mold halves together. This locking mechanism in this case has a locking piece which is pivotable about an axis. Furthermore, a cam mechanism may be provided to activate this locking mechanism.

From the DE 42 12 583 A1 a device for blow molding is known. This device also has mold carriers and a locking device for locking these two mold carriers. In this case, an adjusting element is provided, which is guided substantially in the direction of a center line of the blow mold.

The DE 692 04 407 T2 describes a device for opening and closing a split mold. Here, two half-forms are provided here, which are mutually pivotable. Furthermore, this device has two actuating arms, which are freely rotatably attached with one of its ends to the two half-molds.

The EP 1 276 598 B1 also describes a blow mold and a blow molding machine. In this blow molding machine, a shaft for locking or unlocking of the respective mold halves is provided, said shaft having such an outer contour that the shaft at least partially abuts a locking element in a locking position and releases the said locking element in an unlocking position.

The content of the mentioned EP 1 276 598 B1 is hereby fully incorporated by reference into the subject of the present application.

Of the present invention is based on the object, the operation to simplify a corresponding locking mechanism and In particular, a fast, secure and accurate locking and unlocking to enable.

This According to the invention by a device after Claim 1 and a blow mold according to claim 15 achieved. advantageous Embodiments and developments are the subject of Dependent claims.

A Inventive device for reshaping Plastic preforms to containers has at least a blow mold for receiving the plastic preforms. there this blow mold on at least two moldings, which with respect are pivotable about a connecting axis and at least a arranged on one of the mold parts locking element, which with at least one counter element arranged on the other shaped part cooperates to lock the two mold parts against each other. there is the counter-element arranged around a parallel to the connection axis Axis rotatable counter element, which between a locking position, in which the blow mold is locked and an unlocking position, in which the blow mold can be opened is rotatable, wherein the counter element is such that the counter element in the locking position at least partially on the locking element abuts and in the unlocking the locking element releases.

According to the invention the device is an actuator for rotating the mating member on, wherein this actuating element is a drive element has, which cooperates with the counter element to this to press.

Prefers the counter element is a shaft, and this shaft has one Outer contour on that the counter element in the locking position, at least partially rests against the locking element and in the unlocking the Locking element releases. But it would also be possible that the counter element has a plurality of hooks, through the rotation of the counter-element are pivoted and into a locking area engage the other molding to the moldings against each other to lock. The molded parts are preferably half-shells, which in the assembled state receive a preform or a plastic container.

Advantageous is arranged on the counter element a drivable element, which has a guide surface, which with a relative to the counter element movable guide projection cooperates such that this relative movement of the guide projection a rotation relative to the guide surface of the counter element causes. In this case, the guide projection is preferably stationary arranged, and the counter element moves opposite this leadership advantage. That way, a movement can be the entire blow mold converted into a rotational movement of the counter element become.

Preferably this guide surface is at least partially curved. In this case, a curvature radius particularly preferably deviates this guide surface of a radius of curvature a trajectory of the blow mold, so that in this way Pivoting of the counter element or the shaft is possible.

at a further advantageous embodiment is at least on the counter element or on the actuating element Bevel gear arranged. Preferably, this bevel gear is end provided on the counter element.

Prefers this bevel gear acts with another on the actuator or the counter element arranged bevel gear for rotation of the counter element together. By using bevel gears can a Drive shaft relative to a longitudinal direction of the Movement element or its axis of rotation are inclined, and on this way, as shown with reference to the figures, the implementation of the movement in a particularly advantageous manner.

Preferably is the further bevel gear on a pivotable about an axis of the further bevel gear Lever arranged. By pivoting this lever is done so turning the further bevel gear and thus also turning the first bevel gear and thus also the moving element. Preferably while this lever is pivotable in a vertical plane.

In a further advantageous embodiment, the Actuator on an engaging means, which with cooperates with a arranged on the moving element thread, to effect its rotation. Preferably, this is in this thread around a coarse thread, so that by a longitudinal movement a rotation of the moving element is generated. Conversely, could also be provided on the movement element an engagement element, which together with a thread of the actuating element acts. Also, both on the moving element and the Actuator be provided a thread. That said Engagement means can in a turn of the thread of each other element intervene.

Preferably is said actuator in the direction of the axis of rotation of the actuating element movable. Through this longitudinal movement is - like mentioned above - a rotation of the moving element causes.

In Another advantageous embodiment is at the thread around an external thread. This means, that provided on the movement element, an external thread is, in which engages a projection of the actuating element. By an opening of the actuating element, at the Inner surface of the engagement member is arranged, can the movement element or the thread are performed. The engagement element may be formed as a tip.

In a further advantageous embodiment, the Device a running parallel to the moving element guide rod for guiding a movement of the actuating element on. In this way, even with the fast movements one achieved safe guidance of the actuator become. The actuating element is preferably by a stationary arranged guide curve moves. It However, that would also be possible for a leadership role is provided to facilitate the movement.

In a further advantageous embodiment, the Actuator one with respect to the moving element movably arranged plate-shaped body with a recess into which at least a portion of the Movement element protrudes. In this embodiment is as a control mechanism a slotted guide provided in which the moving element out and is rotated simultaneously defined.

Prefers Therefore, this plate-shaped body is one Pivotable axis which is parallel to the axis of rotation of the moving element, but does not coincide with this axis of rotation.

at a further advantageous embodiment that works Drive element with an end-side arranged in the counter element driven element together.

In a further embodiment, a first guide body is arranged on the counter element and on the actuating element, a second guide body is arranged, wherein the first guide body relative to the second guide body is displaceable and by a displacement the first guide body relative to the second guide body, a rotation of the counter element is effected. Preferably, one of the two guide bodies is a guide groove into which the other guide body, which is preferably designed as a projection or roller, engages.

By a displacement of the projection relative to the groove is also achieved a rotation of the counter element. Preferably, the Groove formed on the counter element and the projection on the actuating element. For example, it would be possible for that to happen at the actuator to one by a predetermined Axis is pivotable lever on which the projection or the formed in the groove engaging roller.

The The present invention is further directed to a blow mold, in particular for a device for forming plastic preforms directed to plastic containers, this blow mold has two mold parts, which with respect to each other around a Connecting axis are pivotable and at least one of the Moldings arranged locking element, which with at least cooperates a counterpart arranged on the other molding part, to lock the two moldings against each other. That's it Counter element about a parallel to the connection axis arranged Axis disposed counter element, which between a locking position, in which the blow mold is locked and an unlocking position, in which the blow mold can be opened, rotatable, wherein the counter element is such that the counter element in the locking position at least partially on the locking element abuts and in the unlocking the locking element releases.

According to the invention provided an actuating element for rotating the counter-element, wherein this actuator has a drive element, which cooperates with the counter element to actuate this.

Further advantageous embodiments will become apparent from the attached Drawings.

In this demonstrate:

1 a representation of a blow mold;

2 a schematic representation for illustrating a locking mechanism according to the invention;

3a a schematic representation for illustrating a locking mechanism according to the invention in a first embodiment;

4a - 4g Various illustrations for illustrating a locking mechanism in a second embodiment;

5a - 5f Representations of a device according to the invention in a third embodiment;

6a - 6h Representation of a device according to the invention in a fourth embodiment;

7a - 7b Representations of a device according to the invention in a fifth embodiment; and

8a - 8d Representations of a device according to the invention in a sixth embodiment.

1 shows a partial view of a blow mold. This blow mold 1 has two around a connection axis 2 rotatable mold halves serving as mold carriers 3 . 4 on, more precisely a first half of the mold 3 and a second mold half 4 , These two mold halves 3 . 4 are configured to have an internal cavity in a sealed state 5 form, in which by means of (not shown) mold inserts a (not shown) preform in a stretch blow molding process blown, that is out of contour, can be.

To close the two mold halves 3 . 4 These will be around the connection axis 2 pivoted so that their two lateral surfaces abut each other. In 1 is a closed locked state of the two mold halves 3 . 4 shown. The reference number 10a refers to a moving element that can be rotated around the two mold halves 3 . 4 lock together.

2 shows a plan view of a central region for illustrating the locking element. Here, too, is the moving element 10a provided, which is equipped as a shaft, which in turn has a recess 12 having. The reference number 9 refers to a locking element, which along the arrow A between the moving element 10a and another movement element 10b which is symmetrical to the moving element 10 is formed, can be inserted. The two movement elements 10a . 10b are rotatable about axes Y, Y '.

To lock the locking mechanism, the moving element 10a that is, the wave 10 , rotated at a predetermined angle, leaving a contour 15 in a recess 13 of the locking element 9 intervenes. Accordingly, an area of the movement element also engages 10b in the corresponding lower area or the recess 13 of the locking element 9 one.

A rotational movement of the movement element is preferred 10b to a rotational movement of the moving element 10a coupled. Thus, in this embodiment, the molding 4 two waves 10a . 10b mounted, each rotatable about a longitudinal axis extending therethrough between the locking position and the unlocking position. The locking element 9 can be in the unlocked position between the two shafts 10a . 10b at least partially passed, and in the locking position are the contours 15 the two movement elements or waves 10a . 10b at least partially so on the locking element 12 that the blow mold 1 is firmly locked.

3a shows a first embodiment of a device according to the invention. You can see here again the movement element 10a Which already in 2 mentioned recess 12 having. This movement element 10a , that is, the shaft, can be rotated about the arrow P1 to cause a locking or unlocking of the blow mold. For this purpose is fixed to the moving element 10a a drivable element 22 arranged, wherein this drivable element 22 a guide surface 23 has, in front of itself a guide projection 24 emotional.

More specifically, this is not a guide projection, but a rotatable guide roller, so as to minimize friction losses. During operation of the device, the blow mold and thus also the actuating element moves 10a along a circular path, which is usually determined by the pitch circle radius of a corresponding carrier on which a plurality of blow molds are arranged. In this circular movement becomes the guide surface 23 to the projection 24 passed, and in this way becomes the moving element 22 rotated in a defined manner along the arrow P1. This rotation in turn causes a locking or unlocking of the blow mold. In the end areas 28 The drivable element has rounded surfaces, respectively, for smooth operation of the locking or unlocking operation.

In a movement of the moving member relative to the guide projection 24 in a given direction, the blow mold is either locked or unlocked. The reverse process, that is, the unlocking or locking, is by another guide surface on the back of the driven element 22 possible. However, it would also be possible for a reverse rotation of the moving element 10a caused by other mechanisms, such as spring mechanisms. It would also be possible for a corresponding drivable element also on the second movement element 11 (see. 2 ) is arranged, and this further driven element for the respective reverse process, that is, the unlocking or locking is provided.

4a shows a further embodiment in a device according to the invention. In this case is also a guide device 39 provided in the form of a guide wheel, said guide wheel a lever 36 pressed, in turn, to one opposite the blow mold 1 solid carrier 37 is arranged. 4b shows a more detailed representation of in 4a shown device. In this case is on the moving element 10 a first bevel gear 32 provided, which with a second on the lever 36 arranged bevel gear 34 interacts.

This is done by pivoting the lever 36 around the axis of the second bevel gear 14 the movement element 10 rotated in a defined manner as a function of a swivel angle. At the bottom, the lever points 36 again a guide surface 38 on, which with the above-mentioned guide device 39 or the wheel interacts. Through a movement element 10 opposite the wheel 39 a pivoting of the lever is effected. Corresponding guide curves on which the wheel 39 may be arranged, but may also be carried out in other ways than the one shown.

The 4c to 4e show further illustrations of the locking mechanism according to the invention. It is in particular the lever 36 shown in several perspective views. At the bottom of the lever 36 are the said guide surface 38a as well as another guide surface 38b arranged. Through these two different guide surfaces can be achieved by appropriately arranged guide curves both pivoting of the lever in 4e to the left as well as a pivoting of the lever in 4e be done to the right. However, it would also be possible to pivot the lever back 36 takes place by its own weight. However, a spring could also be provided for provision here. For example, this spring could be between the carrier 37 and the lever 36 be provided, but also on a region of the movement element.

The 4f and 4g show a further modified embodiment of a device according to the invention. Again, there is a swivel lever 36 provided, at the lower end, however, a wheel 35 is arranged, which is opposite to a guide curve 30 is movable. As in the 4f and 4g shown, may be a movement of the moving element 10 along the arrow P also the wheel 35 along the arrow P opposite the guide curve 30 to be moved.

In this way, the lever 36 pivoted clockwise, and thus the moving element 10 turned. To swing back the lever 36 is it possible for the guide curve 30a decreases again and thus the lever 36 with a movement of the moving element 10 swings back in the clockwise direction and in this way also the moving element 10 is rotated again in a well-defined way. The angle of rotation around which the moving element 10 is rotated by the height difference between the area 30b and 30a the guide curve 30 established. Preferably, however, a further guide level (not shown) is provided which here above the wheel 35 is provided and decreases in the directions of movement of the lever.

The bevel gear 34 is arranged in a (not shown) receiving shaft, wherein for guiding the lever 36 Still storage facilities or intermediate waves can be provided. The cam roller 35 is also preferably rotatably mounted.

The 5a to 5f show a further embodiment of a device according to the invention.

In this embodiment, an actuating element 20 provided, which in the direction of the axis Y, that is along the arrow 22 , up and down is movable. This is a thread 42 of the movement element 10a through this actuator 20 passed through, and with a movement of the actuating element 20 In this way, a rotation of the moving element 10a causes. Preferably, it is the thread 42 around a coarse thread, allowing rotation by a displacement of the actuator 20 easier is possible. Similar in the 4e to 4f shown embodiment is also a cam roller 45 provided, opposite a guide curve 40 is moved to lift the actuator. Another (not shown) management level can be provided for lowering the cam roller.

The reference number 46 refers to another rod, which serves here as anti-rotation or as a control lever. In this way it prevents the actuator 20 around the thread 42 rotates, or the longitudinal movement along the arrow P2 is through this rod 46 secured. It would be possible that the rod 46 rigid at the blow mold 1 is arranged and going through a hole 47 of the actuating element 20 extends therethrough, and thus the actuator 20 opposite the pole 46 is movable. It would also be possible, however, that the rod 46 firmly on the actuator 20 is arranged, and in turn displaceable in the longitudinal direction of the blow mold 1 is arranged. The reference number 48 refers to a housing or a receptacle, among other things, for the storage of the rod 46 can serve.

Inside the actuator 20 can be provided either an internal thread or a tapered body either 49 that in the thread 42 engages and thus in a relative movement, the actuating element 20 along the arrow P2, a rotation of the moving element 10 caused. At the lower end of the moving element, a stop 47 be provided, the relative movement of the actuating element relative to the moving element 10 limited to the bottom.

At the in 5d shown situation is the actuator 20 largely lowered, so that the threaded area 42 runs above the actuating element. At the in 5e shown situation, the actuator is raised, so that the thread 42 down from the actuator 20 protrudes.

In 5f is still a final element 47 provided, which is arranged at the lower end of the thread and which movement of the thread 42 limited to the actuating element, so that the actuating element 20 can not fall off the thread.

The 6a - 6h show a further embodiment of the present invention. In this case, the moving element extends 10a through the actuator 20 or an adjusting lever 62 this actuator 20 therethrough. For this purpose, the operating lever 62 an opening 64 on, which is designed slot-like here and the moving element 10a receives. Below this adjustment lever 62 is a link 66 provided, on the one hand rotationally fixed to the moving element 10a is formed and on the other hand a pen 68 that passes through another opening 69 in the adjustment lever 62 protrudes. This lever is pivotable about a rod 65 or arranged the axis of rotation. The reference number 67 again designates a guide curve of the adjusting lever 62 ,

The reference number 63 refers to a leadership role, which pivoting the lever 62 causes. This can be achieved by the targeted pivoting of the adjusting lever 62 an equally defined rotation of the moving element 10a be achieved.

The 6e - 6h illustrate a corresponding by a pivoting of the adjusting lever 62 effected rotation of the moving element 10a , It can be seen that the adjusting lever 62 is pivotable about an angle δ1. On the other hand, pivoting about this angle δ1 results due to the interaction of the two openings 64 . 69 a pivoting of the movement element 10 by the angle δ2, which is greater here than the said angle δ1. Thus, a lesser adjustment angle is necessary to a correspondingly higher rotational movement of the moving element 10a to reach. The relationship between the two angles δ1 and δ2 can over the in the 6g and 6h shown radii R1 and R2 or their relationship to each other.

The 7a and 7b show a further embodiment of the mechanism according to the invention. This embodiment is similar to that in FIG 3a shown embodiment, but here is the moving element 10a designed in a different way. In this case, the movement element 10a here three engagement elements 72 on which in the locking body 9 engage in a locked state. The actuation of the movement element shown here 11 however, in the same way as with reference to 3a illustrated. The person skilled in the art recognizes that the other movement mechanisms for the movement element shown in the figures also apply 11 Application can be found.

The 8a - 8d show a further embodiment of a mechanism according to the invention. Here again is a cam roller 85 , more precisely, a double cam follower 85 provided, which runs along a (not shown) curved path. At this cam roller is a lever 86 arranged, which is rotated by a movement of the cam roller in rotation. Firm on this lever 86 arranged is an engagement element, which pivoting of the counter element 10a about the axis Y causes.

By pivoting the counter element 10a can be an engagement between hooks 82 and corresponding counter hooks 81 be prepared or solved. In 8c the engagement mechanism is explained in more detail. The lever 86 is, as I said, pivotable on a solid support 84 arranged. Furthermore, on the lever 86 an engagement body, more specifically, one on a roller carrier 87 arranged roll 89 provided, which in a groove 88 which on or in the counter element 10a is formed, runs. These are the groove 88 around a three-dimensional groove and a movement of the roll 89 in this groove leads to a pivoting of the counter element 10a around the axis Y. It can be seen that the groove has a curved course and the role without tilting in this groove 88 can roll. A groove width of the groove is preferred 88 slightly larger than a diameter of the roll 89 , It would also be possible to do the role 89 as a double role to turn the role 89 in two directions of rotation, which can occur depending on the load case, to prevent the wear of the roller 89 and the groove 88 to reduce.

The other hook or the locking element 9 are at the in the 8a - 8d However, it would also be possible to pivot both hooks for opening or closing the blow mold. Thus, in this embodiment, directly in the counter element is a curve 88 integrated to open and close the blow mold. The curve for moving the roll 85 is again controlled by a fixed curve to the machine when the blow molding stations pass this curve in the concentricity. Furthermore, it would also be conceivable that in the movement sequence between the lever 86 and the carrier 84 a slip clutch is integrated, with which on a jamming of the hook 82 and 81 can be reacted.

In a further embodiment, it would also be possible on the moving element 10 respectively. 11 to provide a spur gear which cooperates with a further acting as an actuating element spur gear to achieve rotation of the moving element. In this case, in turn, a lever can be arranged in a further gear or spur gear, which is pivoted by a guide cam in order to achieve in this way a rotational movement of the moving element.

By corresponding proportions of two spur gears which are thus fixed, in which Degree of swing said lever which angle of rotation of the moving element can be achieved.

All features disclosed in the application documents are claimed as essential to the invention, provided they stand alone or in combination with the stand new to the technology.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - US 7384261 B2 [0004]
• - DE 4212583 A1 [0005]
• - DE 69204407 T2 [0006]
• - EP 1276598 B1 [0007, 0008]

Claims (15)

Device for forming plastic preforms into containers with at least one blow mold ( 1 ) for receiving the plastic preforms, this blow mold ( 1 ) two moldings ( 3 . 4 ), which with respect to each other about a connecting axis ( 2 ) are pivotable, with at least one on one of the molded parts ( 3 . 4 ) arranged locking element ( 9 ), which with at least one on the other molding ( 4 . 3 ) arranged counter element ( 10a . 10b . 72 ) cooperates to form the two molded parts ( 3 . 4 ) to lock against each other, wherein the counter element ( 10a . 10b ) about a substantially parallel to the connecting axis ( 2 ) arranged axis (Y, Y ') arranged counter element ( 10a . 10b ), which is rotatable between a locking position in which the blow mold is locked, and an unlocking position in which the blow mold can be opened, wherein the counter element ( 10a . 10b ) is such that the counter element ( 10a . 10b ) in the locking position at least partially on the locking element ( 9 ) and in the unlocked position, the locking element ( 9 ), characterized in that the device comprises an actuating element ( 20 ) for rotating the counter element ( 10a . 10b ), this actuating element ( 20 ) has a drive element, which with the counter element ( 10a . 10b ) cooperates to operate this. Apparatus according to claim 1, characterized in that the counter element ( 10a . 10b ) is a shaft and this shaft has such an outer contour that the counter element ( 10a . 10b ) in the locking position at least partially on the locking element ( 9 ) and in the unlocked position, the locking element ( 9 ) releases. Device according to at least one of the preceding claims, characterized in that on the counter element ( 10a . 10b ) a drivable element ( 22 ), which has a guide surface ( 23 ), which with a relative to the counter element ( 10a . 10b ) movable guide projection ( 24 ) cooperates such that this relative movement of the guide projection relative to the guide surface causes a rotation of the counter element. Device according to claim 3, characterized in that the guide surface ( 23 ) is curved at least in sections. Device according to at least one of the preceding claims, characterized in that at least on the counter element ( 10a . 10b ) or on the actuating element ( 20 ) a bevel gear ( 32 ) is arranged. Apparatus according to claim 5, characterized in that the bevel gear ( 32 ) with another on the actuating element ( 20 ) or the counter element ( 10a . 10b ) arranged bevel gear ( 34 ) for rotation of the counter element ( 10a . 10b ) cooperates. Apparatus according to claim 6, characterized in that the further bevel gear at one about an axis of the further bevel gear ( 34 ) swivel lever ( 36 ) is arranged. Device according to claim 1, characterized in that the actuating element ( 20 ) has an engagement means, which with one on the counter element ( 10a . 10b ) arranged thread ( 42 ) cooperates to effect its rotation. Apparatus according to claim 8, characterized in that the actuating element ( 20 ) in the direction of the axis of rotation (Y) of the actuating element counter element ( 10a . 10b ) is movable. Apparatus according to claim 8, characterized in that the first thread is an internal thread ( 42 ) and the second thread is an external thread. Apparatus according to claim 8, characterized in that the device is parallel to the counter element ( 10a . 10b ) extending guide rod ( 46 ) for guiding a movement of the actuating element ( 20 ) having. Device according to claim 1, characterized in that the actuating element ( 20 ) one opposite the counter element ( 10a . 10b ) movably arranged plate-shaped body ( 62 ) with a recess ( 64 ) into which at least a portion of the mating element ( 10a . 10b ) protrudes. Apparatus according to claim 12, characterized in that the plate-shaped body ( 62 ) is pivotable about a pivot axis, which parallel to the axis of rotation (Y) of the counter element ( 10a . 10b ). Device according to at least one of the preceding claims, characterized in that the drive element with one end on the counter element ( 10a . 10b ) arranged driven element cooperates. Blow mold, in particular for a device for forming plastic preforms into containers, this blow mold ( 2 ) two moldings ( 4 . 6 ), which are pivotable relative to each other about a connection axis, with at least one on one of the molded parts ( 4 . 6 ) arranged locking element ( 12 ), which with at least one on the other molding ( 6 . 4 ) arranged counter element ( 10a . 10b ) cooperates to form the two molded parts ( 4 . 6 ) to lock against each other, wherein the counter element ( 10a . 10b . 11 ) a counter-element arranged around an axis (Y) arranged parallel to the connecting axis (X) ( 10a . 10b . 11 ), which is rotatable between a locking position in which the blow mold is locked, and an unlocking position in which the blow mold can be opened, wherein the counter element is such that the counter element ( 10a . 10b ) abuts in the locking position at least partially on the locking element and releases the locking element in the unlocking position, characterized in that an actuating element ( 20 ) for rotating the counter element ( 10a . 10b ) is provided, said actuating element ( 20 ) has a drive element, which with the counter element ( 10a . 10b ) cooperates to operate this.