RELEASE MECHANISM, ENERGY HARVESTING ARRANGEMENT AND ELECTRONIC LOCKING SYSTEM

Abstract

Release mechanism (12) for an energy harvesting arrangement (10) for an electronic locking system (78), the release mechanism (12) comprising a drive device (18); a harvesting elastic element (30); at least one magnet (36); an input device (38); and an engaging profile (52); wherein the input device (38) is arranged to engage the drive device (18) by means of a magnetic force such that the drive device (18) can be displaced from a starting position (32) by movement of the input device (38) along a harvesting path (58); and wherein the engaging profile (52) is arranged to engage the drive device (18) at an engaging position (60) of the drive device (18), such that further movement of the input device (38) along the harvesting path (58) causes a relative inclination between a drive device surface (26) and a input device surface (42). An energy harvesting arrangement (10) and an electronic locking system (78) are also provided.

Claims

1. Release mechanism for an energy harvesting arrangement for an electronic locking system, the release mechanism comprising: a drive device for driving an electromagnetic generator, the drive device comprising a substantially planar drive device surface; a harvesting elastic element arranged to force the drive device towards a starting position, and arranged to store mechanical energy from displacement of the drive device from the starting position along a harvesting path; at least one magnet; an input device, the input device being movable along the harvesting path, and comprising a substantially planar input device surface arranged to mate with the drive device surface to establish a mating interface; and an engaging profile arranged offset with respect to the mating interface; wherein the input device is arranged to engage the drive device by means of a magnetic force, generated by the magnet and acting between the drive device surface and the input device surface, such that the drive device can be displaced from the starting position by movement of the input device along the harvesting path; and wherein the engaging profile is arranged to engage the drive device at an engaging position of the drive device, such that further movement of the input device along the harvesting path causes a relative inclination between the drive device surface and the input device surface.

2. The release mechanism according to claim 1, wherein the release mechanism comprises a hinge arranged to support the relative inclination between the drive device surface and the input device surface.

3. The release mechanism according to claim 2, wherein the hinge is substantially centered with respect to the magnet when the planar input device surface and the drive device surface mate.

4. The release mechanism according to claim 1, wherein the release mechanism comprises a plate, wherein the plate comprises the drive device surface or the input device surface.

5. The release mechanism according to claim 4, wherein the drive device comprises the plate.

6. The release mechanism according to claim 1, wherein the input device comprises the magnet.

7. The release mechanism according to claim 1, wherein the magnetic force is 10% to 30% larger than the force from the harvesting elastic element when the drive device is in the engaging position.

8. The release mechanism according to claim 1, wherein the input device is arranged to engage the drive device by means of an attractive magnetic force.

9. The release mechanism according to claim 1, wherein the mating interface is substantially perpendicular to the harvesting path.

10. The release mechanism according to claim 1, wherein the harvesting path is substantially linear.

11. The release mechanism according to claim 1, wherein the harvesting path is substantially circular.

12. Energy harvesting arrangement comprising a release mechanism according to claim 1.

13. The energy harvesting arrangement according to claim 12, further comprises a handle operatively coupled to the input device or an access member hinge operatively coupled to the input device.

14. The energy harvesting arrangement according to claim 12, wherein the input device is arranged to be actuated by means of a key.

15. Electronic locking system comprising a release mechanism according to claim 1.

16. Electronic locking system comprising an energy harvesting arrangement according to claim 12.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Further details, advantages and aspects of the present disclosure will become apparent from the following embodiments taken in conjunction with the drawings, wherein:

[0050] FIGS. 1a-1d: schematically represent one example of an energy harvesting system comprising one example of a release mechanism;

[0051] FIGS. 2a-2d: schematically represent a further example of an energy harvesting system comprising further example of a release mechanism;

[0052] FIG. 3: schematically represents a further example of an energy harvesting system, a further example of a release mechanism and a key;

[0053] FIG. 4: schematically represents a further example of an energy harvesting system comprising an access member hinge; and

[0054] FIG. 5: schematically represents an environment in which embodiments presented herein can be applied.

DETAILED DESCRIPTION

[0055] In the following, a release mechanism for an energy harvesting arrangement for an electronic locking system, an energy harvesting arrangement comprising the release mechanism, and an electronic locking system comprising the release mechanism or the energy harvesting arrangement, will be described. The same reference numerals will be used to denote the same or similar structural features.

[0056] FIGS. 1a-1d schematically represent one example of an energy harvesting arrangement 10 comprising one example of a release mechanism 12. The energy harvesting arrangement 10 of this example further comprises a manual handle 14 and an electromagnetic generator 16. FIGS. 1a-1d further indicates a Cartesian coordinate system for referencing purposes. The energy harvesting arrangement 10 may however be oriented arbitrarily in space.

[0057] With reference to FIG. 1a, the release mechanism 12 comprises a drive device 18. The drive device 18 is arranged to drive the electromagnetic generator 16.

[0058] The drive device 18 of this example comprises a drive member 20, a hinge 22 and a plate 24, here constituted by a steel plate. The plate 24 is rotationally coupled to the drive member 20 by means of the hinge 22. The drive device 18 further comprises a planar drive device surface 26, in this example constituted by a surface of the plate 24 (facing to the right in FIG. 1a).

[0059] The drive device 18 of this example further comprises a stop portion 28, here implemented as a projection on the drive member 20. The drive device 18 further comprises drive device teeth (not denoted), here implemented on the drive member 20.

[0060] The release mechanism 12 further comprises a harvesting elastic element 30, here implemented as a coil spring. The harvesting elastic element 30 is connected to the drive device 18, in this example to the drive member 20, and to a stationary structure of the energy harvesting arrangement 10. The stationary structure is stationary in relation to the energy harvesting arrangement 10, but may be movable in space.

[0061] The harvesting elastic element 30 is arranged to force the drive device 18 towards a starting position 32 according to FIG. 1a. In the starting position 32, the harvesting elastic element 30 is preloaded and holds the drive device 18 in the starting position 32. The energy harvesting arrangement 10 further comprises a stationary stop structure 34 (stationary with respect to the energy harvesting arrangement 10). In the starting position 32 of the drive device 18 according to FIG. 1a, the stop portion 28 of the drive device 18 abuts against the stop structure 34.

[0062] The release mechanism 12 further comprises a magnet 36 and an input device 38. In this example, the input device 38 comprises the magnet 36 and an input member 40 to which the magnet 36 is rigidly connected. The input device 38 comprises a planar input device surface 42, here constituted by a surface of the magnet 36 (facing to the left in FIG. 1a). The input device 38 of this example further comprises input device teeth (not denoted), here implemented on the input member 40.

[0063] The energy harvesting arrangement 10 of the example in FIG. 1a further comprises a transmission 44 for transmitting a rotation of the handle 14 to a linear movement of the input device 38. The transmission 44 is in this example constituted by a gear train comprising a first gear wheel 46, a second gear wheel (not visible), a third gear wheel 48 and a fourth gear wheel 50. The handle 14 is rigidly connected to the first gear wheel 46, the first gear wheel 46 is in meshing engagement with the second gear wheel (behind the third gear wheel 48 in FIG. 1a), the second gear wheel is rigidly connected to the third gear wheel 48, the third gear wheel 48 is in meshing engagement with the fourth gear wheel 50, and the fourth gear wheel 50 is in meshing engagement with the input device teeth of the input member 40. The transmission 44 between the handle 14 and the input device 38 is merely one of numerous possible transmissions for operatively coupling the handle 14 to the input device 38.

[0064] In FIG. 1a, the input device surface 42 mates with the drive device surface 26 and a mating interface between the magnet 36 and the plate 24 is established. The hinge 22 of the drive device 18 is centered with respect to the magnet 36 when the input device surface 42 mates with the drive device surface 26 mate. The magnet 36 is held in engagement with the plate 24 by means of an attractive magnetic force from the magnet 36 and acting on the plate 24. The mating interface is constituted by the contact area between the drive device surface 26 and the input device surface 42.

[0065] As can be gathered from FIG. 1a, the drive device surface 26 of the plate 24 has a larger height (larger dimension in the Z-direction) than the input device surface 42 of the magnet 36. Thereby, the plate 24 protrudes over the sides of the magnet 36. Each of the drive device surface 26 and the input device surface 42 may for example be quadrangular, such as rectangular or quadratic.

[0066] The energy harvesting arrangement 10 of the example in FIG. 1a further comprises an engaging profile 52. The engaging profile 52 constitutes a stop member, here exemplified as a stop pin. The engaging profile 52 is stationary with respect to the energy harvesting arrangement 10. The engaging profile 52 does however not necessarily need to be stationary in space. For example, if the energy harvesting arrangement 10 is implemented in a door, also the engaging profile 52 may move together with the door.

[0067] The electromagnetic generator 16 comprises a rotor, here implemented as a driven gear wheel 54, rotatable about a rotor rotational axis 56. The drive device teeth of the drive member 20 are arranged to engage the teeth of the driven gear wheel 54 and rotate the driven gear wheel 54 by means of a linear movement of the drive device 18. However, in FIG. 1a, the drive device teeth of the drive member 20 are disengaged from the gear wheel of the electromagnetic generator 16.

[0068] In FIG. 1a, the handle 14, the transmission 44 and the input device 38 may be said to be components of a primary side of the energy harvesting arrangement 10. The drive device 18 and the electromagnetic generator 16 may be said to be components of a secondary side of the energy harvesting arrangement 10.

[0069] With reference to FIGS. 1a-1d, a method of operating the energy harvesting arrangement 10 will now be described. When the handle 14 is rotated in a first direction by a user as indicated in FIG. 1b, an external force is applied on the input device 38 (due to the transmission 44) and the input device 38 starts to move linearly in an outbound direction along a harvesting path 58.

[0070] Since the input device 38 engages the drive device 18 by means of a magnetic force, generated by the magnet 36 of the input device 38 and acting on the plate 24 of the drive device 18, the drive device 18 is displaced from the starting position 32 by the movement of the input device 38 along the harvesting path 58. As the drive device 18 is displaced from the starting position 32 along the harvesting path 58, mechanical energy is stored in the harvesting elastic element 30. That is, the harvesting elastic element 30 is tensioned more (or starts to be tensioned in case the harvesting elastic element 30 is not preloaded in the starting position 32).

[0071] During this outbound movement of the drive device 18, the drive device 18 also starts to engage the rotor of the electromagnetic generator 16, which thereby rotates slowly, as indicated in FIG. 1b. More specifically, the drive device teeth of the drive member 20 are brought in meshing engagement with the teeth of the driven gear wheel 54. At this stage, the energy harvesting is low. However, the energy harvested from this rotation of the driven gear wheel 54 may be used to wake up and perform an access control procedure of an access control device (described in FIG. 5), for example by means of BLE (Bluetooth Low Energy) communication.

[0072] During the outbound movement of the input device 38 and the drive device 18 along the harvesting path 58, the holding force between the input device 38 and the drive device 18 is entirely magnetic. In the position of the drive device 18 in FIG. 1b, the engaging profile 52 starts to engage the drive device 18. This position of the drive device 18 constitutes an engaging position 60. More specifically, in the engaging position 60, a part of the plate 24 that protrudes outside the mating interface starts to contact the engaging profile 52. Thus, the engaging profile 52 is arranged offset with respect to the mating interface between the drive device surface 26 and the input device surface 42. As can be seen in FIG. 1b, the mating interface is also substantially perpendicular to the harvesting path 58. When the drive device 18 adopts the engaging position 60 according to FIG. 1b, the holding force of the magnet 36 is approximately 10% to 30% larger than the force in the harvesting elastic element 30.

[0073] FIG. 1c shows how the input device 38 makes a slight further outbound movement along the energy harvesting path 58. However, since the plate 24 is stopped by the engaging profile 52, the plate 24 starts to incline or tilt (in the clockwise direction in FIG. 1c). Thus, a relative inclination between the drive device surface 26 and the input device surface 42 occurs. The hinge 22 supports the relative inclination between the drive device surface 26 of the plate 24 and the input device surface 42 of the magnet 36. In this example, the engagement of the plate 24 by the engaging profile 52 and the hinge 22 provide a leverage. The force on the hinge 22 is relatively low.

[0074] The magnet 36 is sensitive to air gaps. Thus, due to the relative inclination, the magnetic force is rapidly reduced and the release mechanism 12 is released, i.e. the harvesting elastic element 30 pulls the drive device 18 rapidly in a return movement along the harvesting path 58 to the starting position 32 as illustrated in FIG. 1d and a relatively high amount of energy is harvested by the electromagnetic generator 16. Since the drive device 18 does not engage the driven gear wheel 54 of the electromagnetic generator 16 in the starting position 32, the driven gear wheel 54 is allowed to spin until the energy from the release fades out. The gear ratio between the teeth of the drive member 20 and the driven gear wheel 54 may be optimized depending on the type of electromagnetic generator 16 used.

[0075] Due to the release of the release mechanism 12 by means of a relative inclination between the drive device surface 26 and the input device surface 42, the force required for release is reduced. The release of the drive device 18 due to a rapidly decreasing magnetic force in this way is also relatively silent.

[0076] After release, a return spring in the handle 14 will return the handle 14 and the input device 38 to a starting position and a new energy harvesting cycle may be repeated.

[0077] FIGS. 2a-2d schematically represent a further example of an energy harvesting arrangement 10 comprising further example of a release mechanism 12. Mainly differences from FIGS. 1a-1d will be described.

[0078] In the example in FIGS. 2a-2d, both the input device 38 and the drive device 18 are movable along a circular harvesting path 58. With reference to FIG. 2a, the drive device 18 comprises a drive member 20, here constituted by a sector gear, pivotally arranged about a rotational axis 62. The drive device 18 further comprises a drive device extension 64 protruding from the drive member 20. The plate 24 is rotationally supported relative to the drive device 18 by means of the hinge 22, which is provided at the end of the drive device extension 64.

[0079] The input device 38 comprises an input member 40, here constituted by a sector shaped member, pivotally arranged about the rotational axis 62. The input device 38 further comprises an input device extension 66 protruding from the input member 40. The magnet 36 is rigidly connected to the end of the input device extension 66.

[0080] The transmission 44 is also in this example constituted by a gear train, but comprises a further gear wheel 68 between the third gear wheel 48 and the fourth gear wheel 50.

[0081] In the starting position 32 of the drive device 18 in FIG. 2a, a side of the drive device 18 is held against the stop structure 34 by means of the tension force in the harvesting elastic element 30. Furthermore, the input device 38 engages the drive device 18 by means of a magnetic force, generated by the magnet 36 and acting between the drive device surface 26 and the input device surface 42.

[0082] By manually rotating the handle 14, as shown in FIG. 2b, the input device 38 and the drive device 18, which is held by the magnetic force, rotate in an outbound direction along the circular harvesting path 58. Energy from the outbound displacement of the drive device 18 from the starting position 32 is stored by the harvesting elastic element 30.

[0083] At the engaging position 60 of the drive device 18 of FIG. 2b, the plate 24 is brought into contact with the engaging profile 52. Further outbound movement of the input device 38 along the harvesting path 58 causes a relative inclination between the drive device surface 26 and the input device surface 42 due to the leverage provided by the hinge 22 and the engaging profile 52, as shown in FIG. 2c. As a consequence, the magnetic holding force is rapidly decreased causing a release of the release mechanism 12. The harvesting elastic element 30 now pulls the drive device 18 to make a return movement along the circular harvesting path 58 while energy of the movement is harvested by the electromagnetic generator 16, as shown in FIG. 2d. The drive device teeth on the drive member 20 move past the driven gear wheel 54 of the electromagnetic generator 16. The driven gear wheel 54 is thereby allowed to spin freely until the speed fades out.

[0084] After release, a return spring in the handle 14 will return the handle 14 and the input device 38 to a starting position and a new energy harvesting cycle may be repeated.

[0085] FIG. 3 schematically represents a further example of an energy harvesting arrangement 10, a further example of a release mechanism 12 and a key 68. Mainly differences with respect to FIGS. 1a-1d will be described.

[0086] Instead of being coupled to a handle 14 by means of a transmission 44 according to FIGS. 1a-1d, the input device 38 of the example in FIG. 3 comprises an input member 40 that can be actuated, directly or indirectly, by insertion of a key. The input member 40 may be constituted by a plate. Otherwise, the input device 38 of the release mechanism 12 in FIG. 3 has the same function as the input device 38 of the release mechanism 12 in FIGS. 1a-1d.

[0087] FIG. 4 schematically represents a further example of an energy harvesting arrangement 10 comprising an access member hinge 72. Mainly differences with respect to FIGS. 2a-2d will be described.

[0088] The access member hinge 72 in FIG. 4 comprises a first hinge member 74 and a second hinge member 76. The second hinge member 74 of this example is rigidly connected to the first gear wheel 46. The input member 40 of the input device 38 in FIG. 4 is thereby indirectly connected to the second hinge member 76 of the access member hinge 72. Thus, by opening an access member supported by the access member hinge 72, the input device 38 is actuated. The input device 38 of the release mechanism 12 in FIG. 4 has the same function as the input device 38 of the release mechanism 12 in FIGS. 2a-2d.

[0089] FIG. 5 schematically represents an environment in which embodiments presented herein can be applied. More specifically, FIG. 5 shows an electronic locking system 78 comprising the energy harvesting arrangement 10 according to the present disclosure and an electronic access control device 80. The access control device 80 is powerable by the electromagnetic generator 16 of the energy harvesting arrangement 10.

[0090] Access to a physical space 82 is restricted by a movable access member 84 which is selectively unlockable. The movable access member 84 is positioned between the restricted physical space 82 and an accessible physical space 86. Note that the accessible physical space 86 can be a restricted physical space in itself, but in relation to the access member 84, the accessible physical space 86 is accessible. The movable access member 84 can be a door, gate, hatch, cabinet door, drawer, window, etc.

[0091] The electronic access control device 80 is arranged to unlock the access member 84. The access control device 80 is connected to a physical lock 88, which is controllable by the access control device 80 to be set in an unlocked state or locked state.

[0092] The access control device 80 communicates with a portable key device 90 over a wireless interface 92 using a plurality of antennas 94a-b. The portable key device 90 is any suitable device portable by a user and which can be used for authentication over the wireless interface 92. The portable key device 90 is typically carried or worn by the user and may be implemented as a mobile phone, smartphone, key fob, wearable device, smart phone case, RFID (Radio Frequency Identification) card, etc. In FIG. 5, two antennas 94a-b can be seen. However, only one antenna or more than two antennas may be provided in connection with the access control device 80. Using wireless communication, the authenticity and authority of the portable key device 90 can be checked in an access control procedure, e.g. using a challenge and response scheme, after which the access control device 80 grants or denies access.

[0093] When the access control procedure results in granted access, the access control device 80 sends an unlock signal to the lock 88, whereby the lock 88 is set in an unlocked state. In this embodiment, this can e.g. imply a signal over a wire-based communication, e.g. using a serial interface (e.g. RS485, RS232), Universal Serial Bus (USB), Ethernet, or even a simple electric connection (e.g. to the lock 88), or alternatively using a wireless interface.

[0094] When the lock 88 is in an unlocked state, the access member 84 can be opened and when the lock 88 is in a locked state, the access member 84 cannot be opened. In this way, access to a restricted physical space 82 can be controlled by the access control device 80.

[0095] While the present disclosure has been described with reference to exemplary embodiments, it will be appreciated that the present invention is not limited to what has been described above. For example, it will be appreciated that the dimensions of the parts may be varied as needed.