Switchable magnetic device and system comprising a housing and a switchable magnetic device

Description

[0001] The present invention relates to a switchable magnetic device and a system comprising a housing and a switchable magnetic device.

[0002] SU 1 557 053 A1 discloses a switchable magnetic device according to the preamble of claim 1. Another switchable magnetic device is shown in US 6 168 221 B1. Utility model DE 29 920 866 U1 discloses a switchable magnetic device, wherein the switchable magnetic device is a magnetic device for fixing a formwork element for precast concrete elements to a base plate. A magnet is movable between a lowered position, in which it rests on the base plate and the position of the formwork element is fixed by magnetic interaction of the magnet with the base plate, and a raised position, in which the formwork element is movable due to reduced magnetic interaction. To move the formwork element into the raised position, a threaded rod is screwed into the magnet, at the end of which is a sleeve with an engaging head.

[0003] However, lifting the magnet requires considerable force to overcome the magnetic interaction. Therefore, the magnet can only be lifted from the base plate using a tool such as a lever applied to its head.

[0004] The present invention was made in view of the aforementioned problem and is based on the objective of providing a switchable magnetic device that is easy to operate and with which the force required by a user to lift a magnet from a formwork base can be reduced.

[0005] This problem is solved by a switchable magnetic device according to claim 1. Preferred embodiments are set out in the dependent claims.

[0006] According to one aspect, a switchable magnetic device comprises at least one magnet assembly that can be switched between an interaction position, in which the magnet assembly is preferably in a magnetic connection with a magnetizable formwork base, preferably by contact with the formwork base, and a release position, in which the magnetic connection between the formwork base and the magnet assembly is reduced, preferably suspended. Furthermore, the magnetic device comprises a fluid-operated energy transfer mechanism, which is connected to the at least one

[0007] The magnet pack is coupled in order to transfer a force to the at least one magnet pack for at least partial transfer from the interaction position to the release position.

[0008] Accordingly, the switchable magnetic device features a fluid-operated energy transfer mechanism. This fluid-operated energy transfer mechanism enables reliable energy transfer with high efficiency. Thus, a lifting force, which counteracts the magnetic force acting on the magnet assembly due to magnetic interaction with the formwork base, can be reliably applied to at least one magnet assembly by the energy transfer mechanism. This force can assist the movement of the magnet assembly, at least partially, but preferably, with a sufficiently large force, accomplish it completely. In particular, the fluid-operated energy transfer mechanism can also function as a force conversion mechanism. In this case, a small actuation force applied by a user can be converted into a relatively larger lifting force.This simplifies the operation of the magnetic device. In particular, a relatively small actuating force can be applied over a relatively large distance on one actuating side of the energy transfer mechanism, while a relatively large lifting force acts over a relatively small distance on the magnet pack side of the energy transfer mechanism. This is especially advantageous when used in magnet packs, as the magnetic force decreases significantly even at a small distance from the formwork base, thus simplifying further removal from the formwork base.

[0009] Preferably, the fluid-operated energy transfer mechanism is a hydraulic mechanism.

[0010] The energy transfer mechanism uses incompressible hydraulic fluids. This ensures reliable energy transfer from the actuator side to the magnet pack side of the energy transfer mechanism, thus simplifying operation.

[0011] According to another aspect, the energy transfer mechanism can include at least one pressure application device, preferably at least one pump cylinder, for introducing energy into the fluid of the energy transfer mechanism.

[0012] The pressure application device reliably introduces the energy required to move at least one magnet pack into the release position into the energy transfer mechanism. In particular, the pressure application device controls the lifting force acting on the at least one magnet pack at the actuating side.

[0013] The pressure application device is, for example, a linear actuator and / or preferably comprises a fixed section and a movable section. This allows an actuating force to be applied simply by actuating the movable section.

[0014] Furthermore, the magnetic device can include a lever assembly coupled to the pressure application device, in particular its movable section. Preferably, the lever assembly is coupled to the movable section in such a way that an actuating force can be applied at a distance from the axis of movement of the movable section, preferably an axis of the linear actuator. The lever assembly preferably extends further away from a center of rotation than the axis of movement of the movable section. The coupling is preferably such that rotation of the lever assembly allows linear movement of the movable section. Thus, a large actuating force can be applied easily.

[0015] According to the invention, the energy transmission mechanism comprises at least one force transmission device, preferably a press cylinder, which is coupled to the at least one magnet package for the transmission of the force for at least partially transferring the at least one magnet package from the interaction position to the release position.

[0016] Because the energy transfer mechanism on the power transmission device is coupled to the at least one magnet pack, the lifting force can be reliably transferred to the at least one magnet pack.

[0017] According to the invention, the power transmission device has a fixed section and a movable section which is coupled to the at least one magnet pack for transferring the at least one magnet pack between the interaction position and the release position.

[0018] The switchable magnetic device preferably includes at least one of the following features: The energy transfer direction mechanism, in particular the at least one force transmission device, is designed to transfer the at least one magnet package translationally, in particular along a direction perpendicular to the formwork base, between the interaction position and the release position. The force transmission device is designed as a linear actuator, in particular as the press cylinder. The force transmission device, a movable section thereof, is arranged at least partially between the formwork base and an upper edge of the magnet pack, and preferably overlaps the magnet pack in a direction parallel to the formwork base. Particularly preferably, an overlap area between a movable section and a fixed section of the force transmission device is arranged, at least partially between the formwork base and an upper edge of the magnet pack, in a direction parallel to the formwork base.A coupling point of a fixed section of the force transmission device is arranged closer to the formwork base than a coupling point on the at least one magnet pack of a movable section of the force transmission device, and / or at least one of the coupling points is arranged between the formwork base and an upper edge of the magnet pack, and / or at least one of the coupling points overlaps the force transmission device at least section by section along a direction of movement of a movable section of the force transmission device.

[0019] According to the invention, a fixed section of the force transmission device is arranged at least partially between the formwork base and an upper edge of the magnet assembly. According to the invention, the at least one magnet assembly has at least one receiving section that receives at least part of the energy transmission mechanism. Preferably, the receiving section extends parallel to the formwork base and / or includes a recess, which is particularly preferably arranged on a side of the magnet assembly facing the formwork base.

[0020] These features allow the switchable magnetic device to be designed compactly.

[0021] Preferably, a plurality of the power transmission devices are coupled to the at least one magnet package.

[0022] This allows a lifting force to be applied to the magnet assembly at various points. This ensures a smooth transition of the magnet assembly from the interaction position to the release position. In particular, it reduces the risk of torque acting on the magnet assembly.

[0023] Preferably, the energy transfer mechanism further comprises a fluid storage device which is fluidly coupled to the pressure application device and / or the power transmission device.

[0024] The fluid storage device allows for better control of the fluid quantity in the energy transmission mechanism. Furthermore, the pressure application device can, for example, repeatedly apply pressure by supplying fluid from the fluid storage device. The energy transmission mechanism can also be protected from damage by, for example, releasing fluid to the fluid storage device in the event of excessive pressure in the power transmission device.

[0025] According to yet another aspect, the energy transfer mechanism may also include a valve device arranged to prevent the transfer of at least one magnet pack to the interaction position.

[0026] This allows at least one solenoid pack to be reliably held in the interaction position. Therefore, additional elements for holding the solenoid pack in the interaction position are unnecessary, simplifying the configuration. In its simplest form, the valve assembly can, for example, include a check valve, which prevents fluid from flowing back from the solenoid pack side to the actuator side when pressure is released. However, the valve assembly can also include, for example, a multi-way valve.

[0027] According to yet another aspect, the fluid-operated energy transfer mechanism can be coupled with a large number of magnet packs.

[0028] If large magnetic forces are required to fix a formwork in its position, a large number of magnet packs are typically used. While, according to the prior art, each magnet pack must be lifted individually with a tool, this approach allows a large number of magnets to be lifted simultaneously by the energy transfer mechanism. This saves time when arranging the formwork and simplifies the configuration.

[0029] Preferably, the plurality of magnet packages are arranged in parallel with respect to the fluid-operated energy transfer mechanism.

[0030] This allows the numerous magnet packages to be lifted reliably and uniformly, especially with the same pressure. Furthermore, malfunctions in individual fluid branches cannot compromise the function of other fluid branches, ensuring that individual magnet packages can be lifted reliably.

[0031] According to yet another aspect, the magnetic device can further comprise a magnetic packet activation device which can be coupled to the at least one magnetic packet, at least for the purpose of transitioning from the release position to the interaction position.

[0032] A separate magnetic packet activation device, independent of the energy transfer mechanism, allows a user to easily activate at least one magnetic packet, thus moving it into the interaction position. Simultaneously, the energy transfer mechanism can be moved to a starting position for the next switching operation.

[0033] According to yet another aspect, the magnetic device can further comprise at least one release support device configured to assist in moving the at least one magnet package into the release position, wherein the release support device preferably has at least one elastic element, particularly preferably a spring element, which is preferably coupled at one end side to the at least one magnet package and at the other end side to a stationary section.

[0034] This allows the operating force required by the user to be further reduced. For example, an elastic element such as a compression spring can be provided between the formwork support and the magnet assembly. The spring force can assist movement away from the formwork support. In particular, once the magnet assembly has been lifted from the formwork support by the energy transfer mechanism, the spring force can overcome the remaining reduced magnetic force.

[0035] According to yet another aspect, a system comprises the switchable magnetic device according to one of the preceding aspects; and a housing that accommodates the switchable magnetic device at least partially therein, wherein preferably at least one section of the pressure application device is accessible from outside the housing, and particularly preferably is arranged outside the housing.

[0036] The housing shields at least one magnet assembly, which is located at least partially inside the housing. This also makes the configuration compact. Since at least part of the pressure application device is accessible from outside the housing, a user can easily apply pressure to the fluid. This increases user-friendliness.

[0037] Preferably, the system includes at least one stop that defines the interaction position independently of the fluid-operated energy transfer mechanism.

[0038] In other words, the interaction position is not defined by the energy transfer mechanism. Therefore, stress on the energy transfer mechanism in the interaction position can be prevented. Furthermore, the housing can be reliably pressed against the formwork base.

[0039] The present invention will now be described in detail with reference to the attached drawings. Fig. 1 shows a system according to the invention with a housing and a magnetic device according to the invention in a perspective view. Fig. 2 shows the magnetic device according to the invention. Fig. 1 in perspective view, with the casing omitted.

[0040] Figuren 1 and 2 Figure 1 shows a system 1 that includes a switchable magnetic device 2. Furthermore, as shown in Figure 1, the system 1 includes a switchable magnetic device 2. Fig. 1 Figure 3 shows a housing 3. The housing 3 is open longitudinally on both sides and has a C-shaped profile in cross-section. The housing 3 accommodates the switchable magnetic device 2 inside, between the legs of the profile.

[0041] In the present embodiment, the magnetic device 2 comprises a magnet pack 4, which is located between an interaction position, shown in Fig. 2 , and can be transferred to a release position. In the interaction position, the magnet assembly 4 is in a magnetic connection with a magnetizable formwork base (not shown), which can also be part of a system together with the magnetic device 2. The formwork base is made of a ferromagnetic material and is therefore magnetizable. In the interaction position of the magnet assembly 4, there is a magnetic interaction between the formwork base and the magnet assembly 4, which exerts a force component on the magnet assembly 4 in the direction of the formwork base 4.

[0042] The magnet assembly 4 comprises at least one permanent magnet. Preferably, the magnet assembly 4, as shown, comprises several parallel, spaced-apart permanent magnet elements in plate form, and furthermore, ferromagnetic elements arranged between them, which are preferably made of a steel-like material. As shown in Fig. 2 As can be seen, the ferromagnetic elements protrude in one direction (parallel to the formwork base) at both ends of the permanent magnet elements.

[0043] Furthermore, the switchable magnetic device 2 has a hydraulic mechanism 5 which is coupled to the magnet package 4 in order to transmit a force to the magnet package 4 for at least partial transfer of the magnet package 4 from the interaction position to the release position.

[0044] The hydraulic mechanism 5 comprises a plurality of linear actuators, namely cylinder elements, in particular a pump cylinder 51 and a plurality of press cylinders 52, and hydraulic pressure-resistant lines 53a and 53b that fluidly connect the plurality of press cylinders 52 to the pump cylinder 51. As shown in Fig. 2 As can be seen, the multiple press cylinders 52 are arranged uniformly with respect to the essentially cuboid magnet assembly 4. More precisely, the four press cylinders 52, or rather the coupling points of the respective press cylinders 52 with the magnet assembly 4, are arranged essentially near the corners of the cuboid magnet assembly 4. In particular, the coupling points are arranged uniformly around the center of gravity of the magnet assembly 4. The press cylinders 52 are coupled to the magnet assembly 4 at the ferromagnetic elements.

[0045] Both the pump cylinder 51 and the press cylinders 52 have a fixed section and a movable section.

[0046] The fixed section of the pump cylinder 51 is connected to or arranged on the housing 3 by force, form, or material connection. The movable section is designed to be movable relative to the fixed section and is, for example, a piston. The movable section can be operated by a user.

[0047] The respective fixed section of the press cylinders 52 is connected to or arranged on a stationary section 6 of the system 1 by means of a force-fit, form-fit, or material-fit connection. The stationary section 6 is a mounting plate that is bent downwards on both longitudinal sides and rests on the formwork base with its bent sections, forming part of the housing, as shown in Fig. 1The fixed section is thus directly or indirectly coupled to the formwork base. The respective movable section of the press cylinder 52 is designed to be movable relative to the fixed section and includes, for example, a piston. The movable section is coupled to or arranged on the magnet assembly 4 by force-fit, form-fit, or material-fit connection, preferably by positive locking, with the magnet assembly 4 resting on the movable section. The coupling point of the movable section to the magnet assembly 4 overlaps the press cylinder 52 along one direction of movement of the movable section.

[0048] The fixed section and the movable section of the press cylinders 52 are each arranged, at least partially, between an upper edge of the magnet assembly 4 and the formwork base, viewed in a direction perpendicular to the formwork base. The fixed section and the movable section are arranged overlapping with the magnet assembly 4, viewed in a direction parallel to the formwork base or perpendicular to the direction of movement.

[0049] The movable section is movable at least section by section between two end positions, preferably inside the fixed section, along the linear direction of movement (an axial direction perpendicular to the formwork base). An overlap area, viewed in a direction perpendicular to the direction of movement or parallel to the formwork base, of the movable section and the fixed section of the press cylinder 52 at at least one of the two end positions is arranged at least section by section between the formwork base and an upper edge of the magnet assembly.

[0050] The coupling point of the fixed section of the press cylinder 52 is located closer to the formwork base than the coupling point to the at least one magnet pack 4 of the movable section.

[0051] In the pump cylinder 51 and the press cylinders 52, the fixed section is divided into two chambers by the movable section. In this case, both chambers in the pump cylinder 51 and the press cylinders 52 are filled with hydraulic oil. Thus, all hydraulic cylinders are double-acting cylinders.

[0052] Each chamber of the press cylinders 52 is connected to a chamber of the pump cylinder 51 via lines 53a. The other chamber of each press cylinder 52 is connected to the other chamber of the pump cylinder 51 via lines 53b. Thus, the press cylinders 52 are connected in parallel in the hydraulic mechanism 5.

[0053] Furthermore, the magnetic device 2 comprises a magnetic activation device 7, which has a threaded rod 71 screwed into the magnet assembly 4. At the upper end of the threaded rod 71 is a knob 72, which can be operated by a user.

[0054] Furthermore, the magnetic device 2 comprises a release support device 8. The release support device 8 comprises an essentially hollow cylindrical element 81, which is coupled to the magnet pack 4 and inside which is a spring element, which is coupled at its lower end to the stationary section and at its upper end to the top of the cylindrical element 81, so that a force is transmitted from the spring element to the cylindrical element 81 and thus to the magnet pack 4, which counteracts a magnetic force and thus assists in moving the magnet pack 4 into the release position.

[0055] The operation of the above setup will now be described below.

[0056] The switchable magnetic device 2 comprises at least one magnet assembly 4, which can be moved between an interaction position, in which the magnet assembly 4 is in a magnetic connection with a magnetizable formwork base, and a release position, in which the magnetic connection between the formwork base and the magnet assembly 4 is reduced. Furthermore, the magnetic device 2 comprises a fluid-operated energy transmission mechanism, here the hydraulic mechanism 5, which is coupled to the at least one magnet assembly 4 in such a way as to transmit a force to the at least one magnet assembly 4 for moving it, at least partially, from the interaction position to the release position.

[0057] A user can push down the movable section (piston) of the pump cylinder 51 from its initial position on the actuating side. This pressurizes the fluid between the respective chambers of the press cylinders 52 and the single chamber of the pump cylinder 51, which are connected via lines 53a. This pressure transmits a force via the movable section of the press cylinders 52 to the magnet assembly 4, directed away from the formwork base in a direction perpendicular to the formwork base. Thus, the respective chambers of the press cylinders 52 and the single chamber of the pump cylinder 51, which are connected via lines 52a, form an actuating hydraulic path. This path transmits a lifting force to the at least one magnet assembly 4, at least partially, from the interaction position to the release position.

[0058] The respective chambers of the press cylinders 52 and the one chamber of the pump cylinder 51, which are connected via the lines 53b, form a follower hydraulic path, via which the fluid is followed to the movable section of the pump cylinder 51 by the pressure of the movable section of the press cylinders 52.

[0059] Preferably, the total cross-sectional area of ​​the movable sections of the press cylinders 52 that are in contact with the fluid is larger than the cross-sectional area of ​​the movable section of the pump cylinder 51 that is in contact with the fluid. The hydraulic mechanism acts as a force conversion mechanism. A small actuating force applied by a user to the energy transfer mechanism can be converted into a relatively larger lifting force. This facilitates the operation of the magnetic device. In particular, a relatively small actuating force can be applied over a relatively large distance on one actuating side of the energy transfer mechanism, while a relatively large lifting force acts over a relatively small distance on one magnet pack side of the energy transfer mechanism.This is particularly advantageous when used in magnet packages, as the magnetic force decreases significantly even at a small distance from the formwork base, thus simplifying further removal from the formwork base.

[0060] The fluid-operated energy transfer mechanism here is the hydraulic mechanism.

[0061] The energy transfer mechanism uses incompressible hydraulic fluids. This ensures reliable energy transfer from the actuator side to the magnet pack side of the energy transfer mechanism, thus simplifying operation.

[0062] Furthermore, the energy transfer mechanism 5 includes the pump cylinder 51 as a pressure application device for introducing energy into the fluid of the energy transfer mechanism.

[0063] The pump cylinder 51 reliably applies pressure to the fluid, thereby supplying energy to the energy transfer mechanism required to move the magnet assembly 4 into the release position. A user can also manually or with a tool actuate the movable section of the pump cylinder, thereby controlling the pressure application.

[0064] Furthermore, the energy transmission mechanism 5 includes the press cylinders 52 as force transmission devices, which press the magnet assembly 4 away from the formwork base. The respective force transmission device is subjected to compressive stress, at least section by the magnetic force and the force of gravity. In particular, at least one overlap area, viewed in the direction of movement and perpendicular to it, between the movable section and the fixed section is subjected to compressive stress. The press cylinders 52 are coupled to the magnet assembly 4 to transmit the force for moving the at least one magnet assembly 4 from the interaction position to the release position, at least section by section.

[0065] The pump cylinder 51 is also preferably designed as a press cylinder.

[0066] Because the energy transmission mechanism 5 is coupled to the press cylinders 52, particularly the movable sections of the press cylinders 52, with the at least one magnet assembly 4, the lifting force can be reliably transmitted to the at least one magnet assembly 4. The force transmission devices are preferably coupled to the magnet assembly 4 in such a way that they move together with the magnet assembly 4, preferably along the linear direction of movement. Particularly preferably, the movable section of the press cylinders 52 is formed directly, and even more preferably, integrally with the magnet assembly 4.

[0067] The force transmission device 52 has a fixed section and a movable section, which is coupled to the at least one magnet assembly 4 for transferring the at least one magnet assembly 4 between the interaction position and the release position. Since the movable section is movable relative to the fixed section along the direction of movement, the transfer between the interaction position and the release position can easily occur along the direction of movement.

[0068] The energy transfer direction mechanism 5 is designed to transfer at least one magnet pack 4 translationally, in particular along a direction perpendicular to the formwork base, between the interaction position and the release position. This allows the arrangement to be designed compactly and the magnetic force to decrease rapidly.

[0069] The force transmission device 52 is designed as a linear actuator, in particular as the press cylinder. This also allows for a compact arrangement.

[0070] The force transmission device, preferably a movable and / or fixed section thereof, is arranged at least section by section between the formwork base and an upper edge of the magnet pack 4, and more preferably overlapping the magnet pack 4 at least section by section in a direction perpendicular and / or parallel to the formwork base. In particular, an overlap area of ​​a movable section and a fixed section of the force transmission device can be arranged at least section by section between the formwork base and an upper edge of the magnet pack, in a direction parallel to the formwork base (perpendicular to the direction of movement). This also allows for a compact arrangement.

[0071] A coupling point of a fixed section of the force transmission device 52 is arranged closer to the formwork base than a coupling point to the at least one magnet assembly 4 of a movable section of the force transmission device. Furthermore, at least the coupling point to the stationary section is arranged between the formwork base and an upper edge of the magnet assembly. The coupling point of the movable section to the magnet assembly 4 overlaps the force transmission device at least partially along the direction of movement of the movable section of the force transmission device. This also allows for a compact arrangement. The magnet assembly 4 has four bores that extend perpendicular to the formwork base and project through the sections of the press cylinders 52. Thus, the magnet assembly has a plurality of recesses as receiving sections for parts of the energy transmission mechanism.

[0072] Furthermore, a plurality of the press cylinders 52 are coupled to the at least one magnet assembly 4. The arrangement described above for one press cylinder 52 preferably applies to each of the plurality of press cylinders 52.

[0073] Thus, a lifting force can be transferred to the magnet assembly 4 at various points on the at least one magnet assembly 4. This ensures a smooth transition of the magnet assembly from the interaction position to the release position. In particular, the risk of torques acting on the magnet assembly can be reduced if the force transmission devices are arranged uniformly around the center of gravity of the magnet assembly.

[0074] The multitude of power transmission devices 52 are arranged in parallel with respect to the fluid-operated energy transmission mechanism 5.

[0075] The numerous power transmission devices can reliably transmit force with the same acting pressure, thus ensuring uniform lifting. Furthermore, malfunctions in individual lines 53a and 53b between the individual press cylinders 52 and the pump cylinder 51 cannot impair the function of other lines, so that the magnet assembly 4 can be reliably lifted.

[0076] Furthermore, the magnetic device 2 has a magnetic package activation device in the form of the knob 72 and the threaded rod 71, which can be coupled to the at least one magnetic package, at least for the purpose of transferring it from the release position to the interaction position.

[0077] This allows the user to easily move the magnetic assembly 4 into the interaction position. Simultaneously, the energy transmission mechanism 5 can be moved into a starting position for the next switching operation. If the movable section of the pump cylinder 51 is in a lowered position in the release position of the magnetic assembly, the user can apply a pressure force to the knob 72, which moves the magnetic assembly 4 into the activation position. At the same time, the fluid in the actuating hydraulic paths, driven by the movable sections of the pistons 5, propels the movable section of the pump cylinder 51 into the starting position for a new switching operation.

[0078] Furthermore, the magnetic device 2 comprises the two release support devices 8, which are configured to assist in moving the at least one magnet package 4 into the release position, wherein the release support devices 8 have a spring element which is coupled at one end side to the at least one magnet package 4 and at the other end side to a stationary section 6.

[0079] This allows the operating force required by the user to be further reduced. The spring force can assist in moving the magnet away from the formwork base. In particular, once the magnet assembly 4 has been lifted from the formwork base by the energy transfer mechanism 5, the spring force can overcome the remaining reduced magnetic force.

[0080] System 1 comprises the housing 3, which at least partially accommodates the switchable magnetic device 2, wherein a section of the pressure application device 51, namely the movable section of the pump cylinder 51, which is provided with a knob 54, is arranged outside the housing 3. The housing accommodates the magnetic assembly 4, the movable section of the pump cylinder 51, the press cylinders 52, and the lines 53a and 53b and the release support devices 8, each at least partially, within it and overlaps these parts in a direction perpendicular to the formwork base.

[0081] The housing 3 shields at least one magnet assembly 4, which is located at least partially inside the housing 3. This makes the configuration compact. Since the knob 54 is accessible from outside the housing, a user can easily apply pressure to the fluid. This increases user-friendliness.

[0082] Preferably, the system 1 comprises at least one stop that defines the interaction position independently of the fluid-operated energy transfer mechanism. This stop can, for example, be formed by the formwork base itself, on which the magnet assembly 4 rests. Alternatively, a stop can be provided on the housing. The housing has a bushing 9 on the bottom surface of which the knob 72 can rest, thus defining the interaction position when coupled with the magnet assembly 4. In other words, the interaction position is not defined by the energy transfer mechanism. In particular, neither the movable section of the pump cylinder 51 nor that of the press cylinders 52 rests against a stop. Therefore, a load on the energy transfer mechanism 5 in the interaction position can be prevented. Furthermore, the housing 3 can be reliably pressed against the formwork base.In the interaction position, the magnetic force is transferred to the housing to press the housing against the formwork base.

[0083] The housing can, for example, be the housing of a box magnet or an integral section of a formwork device.

[0084] The parts of the energy transfer mechanism are preferably made of non-magnetic material. Modifications to the embodiment

[0085] At least one of the magnet packs can also have a receiving section that extends parallel to the formwork base. A recess can be arranged on the side of the magnet pack facing the formwork base. This recess can be recessed into a surface facing the formwork base. In other words, the receiving section is located between the top edge of the magnet pack and the formwork base.

[0086] For example, part of the conductors 53a and 53b can be arranged within the receiving section. This makes the arrangement particularly space-saving. The receiving section is preferably formed at least in the interaction position of the magnet assembly 4 and thereby accommodates parts of the energy transfer mechanism. Preferably, the receiving section overlaps at least partially parts of the energy transfer mechanism, in a direction parallel to the formwork base and perpendicular to an extension direction of the magnet assembly. This also helps to keep the configuration compact. The receiving section is preferably formed by the ferromagnetic elements or non-magnetic elements of the magnet assembly. This reduces interference with the magnetic field and its effects.

[0087] The energy transfer mechanism could, for example, be a pneumatic one. However, a hydraulic mechanism is preferable due to the incompressibility of hydraulic oil.

[0088] The multiple power transmission devices can also be connected in series with respect to the energy transmission mechanism, particularly the pressure application device, whereby the chambers of the press cylinders can be coupled to one another in series. Thus, not every power transmission device needs to be coupled to the pressure application device. Rather, the lines between the power transmission devices can be provided separately. This makes the arrangement very compact, and the pressure application device can be positioned as desired.

[0089] It is also possible to use a pull cylinder as a linear actuator for the pressure application device and / or the force transmission device instead of a press cylinder.

[0090] Although not shown in the figures, the magnetic device can include a lever assembly that can be coupled to the pump cylinder 51, in particular to its movable section. The lever assembly can be coupled to the movable section in such a way that an actuating force can be applied at a distance from the axis of movement of the pump cylinder 51. The lever assembly preferably extends further away from a center of rotation than the axis of movement of the pump cylinder. The center of rotation can be located on the housing, with the lever assembly being rotationally coupled to the housing. The coupling to the pump cylinder is preferably such that rotation of the lever assembly allows a linear movement of the movable section. Thus, a large actuating force can be applied easily.Furthermore, the pressure application device can also be a pump such as a vane pump instead of the hydraulic cylinder.

[0091] The energy transfer mechanism described above can further include a fluid storage device that is fluidly coupled to the pressure application device and / or the power transmission device. This allows for better control of the fluid quantity within the energy transfer mechanism. Furthermore, the pressure application device can, for example, repeatedly apply pressure by supplying fluid from the fluid storage device. The energy transfer mechanism can also be protected from damage by, for example, releasing fluid to the fluid storage device in the event of excessive pressure in the power transmission device. For this purpose, the energy transfer mechanism preferably includes a relief valve that couples at least a section of the actuating channel to the fluid storage device.

[0092] Furthermore, the energy transmission mechanism 5 can include a valve arrangement designed to prevent the at least one solenoid pack 4 from moving towards the interaction position. For example, a throttle valve can be arranged in the actuation path or the tracking path, whereby, when the throttle is closed, fluid movement is prevented and the position of the solenoid pack is maintained. The valve can also be a check valve.

[0093] The valve assembly can also include, for example, a multi-way valve. If a fluid storage device is provided, one path of the valve can connect the power transmission device to the pressure application device, while another path can connect the power transmission device to the fluid storage device. When switching from one path to the other, the pressure in the power transmission device remains constant.

[0094] Furthermore, the hydraulic cylinders do not necessarily have to be double-acting designs. A single-acting hydraulic cylinder is also conceivable, in which case only the actuation path is formed, and lines 53b are omitted.

[0095] Furthermore, the fluid-operated energy transfer mechanism can be coupled with a multitude of magnet packs, which can be connected in series or in parallel.

[0096] If large magnetic forces are required to fix a formwork in its position, a large number of magnet packs are typically used. While, according to the prior art, each magnet pack must be lifted individually with a tool, this approach allows a large number of magnets to be lifted simultaneously by the energy transfer mechanism. This saves time when arranging the formwork and simplifies the configuration.

[0097] Preferably, the plurality of magnet packages are arranged in parallel with respect to the fluid-operated energy transfer mechanism.

[0098] This allows the numerous magnet packages to be lifted reliably and uniformly, especially with the same pressure. Furthermore, malfunctions in individual fluid branches cannot compromise the function of other fluid branches, ensuring that individual magnet packages can be lifted reliably.

[0099] Another aspect focuses on a method in which at least one magnet package is transferred, at least section by section, from the interaction position to the release position by means of a fluid-operated energy transfer mechanism.

[0100] In the present revelation, "at least" also includes the respective totality, unless otherwise taught by the revelation. Reference symbol list

[0101] 1 System 2 Switchable magnetic device 3 Housing 4 Magnet assembly 5 Hydraulic mechanism (energy transmission mechanism) 51 Pump cylinder (pressure application device) 52 Press cylinder (force transmission device) 53a, 53b Lines 54 Knob 6 Stationary section 7 Magnetic activation device 71 Threaded rod 72 Knob 8 Release support device 81 Hollow cylindrical element 9 Bushing

Claims

1. Switchable magnet device (2), comprising: at least one magnet stack (4) that is transferable between an interaction position in which the magnet stack (4) is magnetically functionally connected to the formwork support, preferably to a magnetisable formwork support, preferably by contact with the formwork support, and a release position in which the magnetic functional connection between the formwork support and the magnet stack (4) is reduced, preferably canceled, wherein the magnet device (2) furthermore comprises a fluid-driven energy transmission mechanism (5) that is coupled to the at least one magnet stack (4) in order to transmit a force to the at least one magnet stack (4) for at least partially transferring the at least one magnet stack (4) from the interaction position into the release position, wherein the at least one magnet stack (4) has at least one accommodating section which accommodates at least a portion of the energy transmission mechanism (5) within it, wherein the energy transmission mechanism (5) comprises at least one force transmission device, which is coupled with the at least one magnet stack (4) for force transmission of the force for at least partially transferring the at least one magnet stack (4) from the interaction position into the release position, wherein the force transmission device (52) includes a fixed section and a movable section which is coupled to the at least one magnet stack (4) for transferring the at least one magnet stack between the interaction position and the release position, characterized in that the fixed section of the force transmission device is structured to be arranged between the formwork support and an upper edge of the magnet stack (4) at least in sections.

2. The switchable magnet device (2) according to claim 1, wherein the fluid-driven energy transmission mechanism (5) is a hydraulic mechanism.

3. The switchable magnet device (2) according to claim 1 or 2, wherein the energy transmission mechanism (5) comprises at least one pressure application device, preferably at least one pump cylinder (51), for the energy input into the fluid of the energy transmission mechanism (5).

4. The switchable magnet device (2) according to one of the preceding claims, wherein the force transmission device is a linear actuator, preferably a pressing cylinder (52).

5. The switchable magnet device (2) according to claim 4, wherein a coupling location of the fixed section of the force transmission device (52) is structured to be arranged closer to the formwork support than a coupling location to the at least one magnet stack of the movable section of the force transmission device (52).

6. The switchable magnet device (2) according to claim 4 or 5, wherein a plurality of the force transmission devices (52) are coupled with the at least one magnet stack (4), preferably coupled in parallel with respect to the fluid-driven energy transmission mechanism.

7. The switchable magnet device (2) according to one of claims 3 to 6, wherein the energy transmission mechanism (5) furthermore has a fluid storage device which is fluid communicably coupled with the pressure application device (51) and / or the force transmission device (52).

8. The switchable magnet device (2) according to one of the preceding claims, wherein the energy transmission mechanism (5) furthermore comprises a valve device which is arranged to prevent a transfer of the at least one magnet stack (4) towards the interaction position.

9. The switchable magnet device (2) according to one of the preceding claims, wherein the fluid-driven energy transmission mechanism (5) is coupled with a plurality of magnet stacks (4).

10. The switchable magnet device (2) according to claim 9, wherein the plurality of magnet stacks (4) is arranged in parallel with respect to the fluid-driven energy transmission mechanism (5).

11. The switchable magnet device (2) according to one of the preceding claims, wherein the magnet device (2) furthermore comprises a magnet stack activation device (7) which is couplable with the at least one magnet stack (4) at least for a transfer from the release position into the interaction position.

12. The switchable magnet device (2) according to one of the preceding claims, wherein the magnet device furthermore comprises at least one release support device (8) which is configured to support a transfer of the at least one magnet stack (4) into the release position, wherein the release support device (8) preferably includes at least one elastic element, particularly preferred a spring element, which is preferably coupled at one end side to the at least one magnet stack (4), and at the other end side to a stationary section (6).

13. The switchable magnet device (2) according to one of the preceding claims, wherein the accommodating section is formed to extend in parallel to the formwork support, and / or the accommodating section comprises a recess which is preferably provided on a side of the at least one magnet stack (4) facing the formwork support.

14. System (1), comprising: the switchable magnet device (2) according to one of the preceding claims, and a housing (3) that at least partially receives the switchable magnet device within it, wherein preferably at least a section of the pressure application device (51) according to claim 3 is accessible from outside the housing (3), particularly preferably arranged outside the housing (3).

15. The system (1) according to claim 14, wherein the system (1) comprises at least one limit stop which defines the interaction position independent of the fluid-driven energy transmission mechanism (5).