Device for actuating multiple loads

A device (219) includes a housing (301) and a link (320) displaceably arranged in the housing (301) and having an input port (323) configured to receive an input force (269) oriented along a first axis (91), a first output port (321) configured to provide a first output force (261) based on the input force (259, 269), and a second output port (322) configured to provide a second output force (262) based on the input force (259, 269). The link (320) is configured to move the first output port (321) from a start position (291) to a stop position along the first axis (91) by a first distance in response to receiving the input force (269) and to move the second output port (322) from the start position (291) to the stop position (294) along the first axis (91) by a second distance (422) in response to receiving the input force (259, 269). The first distance is smaller than the second distance.

TECHNICAL FIELD

Various examples generally relate to providing a first output force to a first load and a second output force to a second load. Various examples specifically relate to actuating multiple loads in a sequenced manner.

BACKGROUND

Motorized actuators are widely employed to provide automated operation. For example, motorized actuators are employed in vehicles to operate seating functionality. Motorized actuators may be used to displace a headrest of a seat, to adjust a seating depth, or recline the backrest of the seat. For this, a corresponding actuation mechanisms, e.g., a lock, recliner, or moving part, may be actuated.

Motorized actuators can be expensive and complex. To reduce the complexity, typically the design of the motorized actuators is carefully chosen in view of the load to be handled.

Sometimes, when multiple different loads are desired to be actuated by the same motorized actuator, it may be required to design the motorized actuators so as to handle a sum of the resistances provided by the two loads. It can require significant forces to overcome the sum of the resistances. This may result in complexity of the motorized actuator. For example, applications are known where, both, a locking mechanism of a headrest is to be unlocked, as well as a locking mechanism of a backrest of the seat is to be unlocked by a single motorized actuator. In reference implementations, it can be required to design the motorized actuator to handle the sum of the resistances imposed by unlocking the locking mechanism of the headrest and unlocking the locking mechanism of the backrest. This, however, can require a complex and expensive motorized actuator, because the sum of the resistances can require a significant force to be output by the motorized actuator.

SUMMARY

Therefore, a need exists for advanced techniques of actuating multiple loads. In particular, a need exists for techniques of actuating multiple loads which overcome or mitigate at least some of the above-identified restrictions and drawbacks.

This need is met by the features of the independent claims. The dependent claims define embodiments.

A device includes a housing and a link. The link is displaceably arranged in the housing. The link has an input port. The input port is configured to receive an input force. The input force is oriented along a first axis. The link also has a first output port. The first output port is configured to provide a first output force based on the input force. The link also has a second output port configured to provide a second output force based on the input force. The link is configured to move the first output port from a start position to a stop position along a first axis by a first distance and in response to receiving the input force. The link is further configured to move the second output port from the start position to the stop position along the first axis and by a second distance in response to receiving the input force. The first distance is smaller than the second distance.

A system includes such a device, and a first load, as well as a second load. The first load is attached to the first output port. The second load is attached to the second output port.

A device includes a housing and a link displaceably arranged in the housing. The link has an input port configured to receive an input force oriented along a first axis, a first output port configured to provide a first output force based on the input force, and a second output port configured to provide a second output force based on the input force. The link is configured to displace from a start position to a stop position, said displacing including a translation and a rotation. A distance between the first output port and the input port along the first axis and in the start position is larger than a distance between the second output port and the input port along the first axis and in the start position.

A method includes displacing a link arranged in a housing and having an input port configured to receive an input force oriented along a first axis, a first output port configured to provide a first output force based on the input force, and a second output port configured to provide a second output force based on the input force. By said displacing, the first output port is moved from a start position to a stop position along the first axis by a first distance in response to receiving the input force and the second output port is moved from the start position to the stop position along the first axis by a second distance in response to receiving the input force. The first distance is smaller than the second distance.

A method includes translationally and rotationally displacing a link arranged in a housing between a start position to a stop position. The link has an input port configured to receive an input force oriented along a first axis, a first output port configured to provide a first output force based on the input force, and a second output port configured to provide a second output force based on the input force. A distance between the first output port and the input port along the first axis and in the start position is larger than a distance between the second output port and the input port along the first axis and in the start position.

By such techniques, it is possible to provide different distances of travel of an actuation member (stroke) for actuating the first load and the second load, respectively. By providing different strokes for actuating the first load and the second load, respectively, it is in turn possible to separate peaks of the first output force and the second output force in time domain. Hence, by providing different strokes to the first load and the second load, it is in other words possible to sequence actuation of the first load and the second load. In other example use cases, it is possible to limit the maximum force output to the first and second load (load limiting).

Load limiting and/or load sequencing, in turn, enables to relax the specification requirements imposed on a motorized actuator configured to provide the input force. For example, by such techniques of load limiting or load sequencing, a time-domain profile of the input force may be obtained which has a maximum that is smaller than the sum of the maximums of a first resistance imposed by the first load and a second resistance imposed by actuating the second load, wherein the first and second resistances counteract the input force.

DETAILED DESCRIPTION OF EMBODIMENTS

Hereinafter techniques of actuating two loads are described. The two loads may include actuating mechanisms that are actuated by a motorized actuator.

The techniques described herein may be employed to limit the output force (load limiting). For example, the output force may be limited by reducing the resistance imposed by one of two loads on an input force provided by the motorized actuator, i.e., by limiting the effective resistance seen by the motorized actuator over the course of actuation. Then, the maximum force required to be provided by the motorized actuator may be limited.

The techniques described herein may further be employed to actuate the two loads in a sequenced manner (load sequencing). Hence, first, a first one of the two loads is actuated, and then a second one of the two loads is actuated. Such sequenced actuation of the two loads, again, enables to reduce the maximum force to be provided by a motorized actuator. In particular, it may not be required to design the motorized actuator so as to provide a maximum force which corresponds to the sum of the maximums of the resistances imposed by, both, the first and second loads. Rather, it can be sufficient to design the motorized actuator so as to provide a maximum force which corresponds to the larger one of the maximums of the resistances imposed by the first and second loads.

In examples, a sequencing of the actuation of the two loads and/or a load limiting is achieved by actuating the first and second loads with different strokes of, e.g., a Bowden cable. Output ports associated with the different loads may move by different distances.

For example, for load sequencing, the Bowden cable of a first load can be designed to impose a resistance which varies over the course of the stroke, respectively the duration of the actuation. For example, the maximum of the resistance of the first load can be offset in time-domain from the maximum of the resistance of the second load over the course of actuation. Then, the motorized actuator provides, initially, a force to counteract the resistance imposed by, e.g., the first load; and, subsequently, provides a force to counteract the resistance imposed by the second load.

Such techniques may be achieved by a device which includes a housing and a link which is displaceably arranged within the housing. The link may be configured to receive the input force from the motorized actuator and to output forces to, both, the first and second loads. By appropriately configuring the displacement of the link within the housing, it is possible to implement the different strokes when actuating the first and second loads. For example, the displacement may include a rotation and a translation which are superimposed. Furthermore, by appropriately configuring the displacement of the link within the housing, it is possible to match the stroke-dependent profiles of the resistances imposed by the first and second loads to the input force, respectively.

In an example, the link includes an input port configured to receive the input force, e.g., from the motorized actuator and via a cable. The link also includes a first output port configured to provide a first output force to a first load, e.g., via a Bowden cable and to a corresponding actuation member of the first load. The link also includes a second output port configured to provide a second force to a second load, e.g., via a further Bowden cable and to a corresponding actuation member of the second load.

As a general rule, the input port and one of the first output port and the second output port may be co-located. For example, it is possible that the input port and the second output port are co-located; then, it would be possible that the cable providing the input force and the cable to the actuation member of the second load are integrally formed.

In an example, the link can be configured to move the first output port from a start position to a stop position along a first axis—which is co-linear with the input force—by a first distance. The link can be configured to move the second output port from the start position to the stop position along the first axis by a second distance. The first output port and/or the second output port may additionally move along the second axis, e.g., by corresponding third and fourth distances.

The first distance may be smaller than the second distance. Thereby, a load-dependent stroke can be provided.

Alternatively or additionally, a distance between the first output port and the input port along the first axis may be smaller than a distance between the second output port and the input port along the first axis, in the start position. Thereby, a rotation of the link provides the load-dependent stroke.

Such techniques enable to implement the motorized actuator in a comparably simple manner. In particular, the maximum force that needs to be provided by the motorized actuator can be comparably limited.

FIG. 1schematically illustrates aspects with respect to a seat100. The seat includes multiple displaceable parts, e.g., a headrest111, a backrest112. The seat also includes a base113. It is possible to actuate an actuating mechanism of the headrest111. For example, it would be possible to unlock a locking mechanism of the headrest111. The respective displacement121—which may result due to gravity in response to said unlocking, i.e., the headrest “falling down”—is illustrated inFIG. 1. It is also possible to actuate an actuating mechanism of the backrest. For example, it would be possible to unlock a locking mechanism of the backrest112; thereby, it is possible to trigger reclining of the backrest112towards the base113. The respective displacement122is illustrated inFIG. 1. This displacement may be facilitated by a coil spring or another storage means to store mechanical energy in the locked position of the backrest112, which mechanical energy may then be used to execute the displacement122.

Hereinafter, techniques are described which enable efficient actuation of, both, the actuation mechanism of the headrest111, as well as the actuation mechanism of the backrest112. In particular, techniques are described which enable combined actuation of, both, the actuation mechanism of the headrest111, as well as the actuation mechanism of the backrest112by a single motorized actuator (not illustrated inFIG. 1).

FIG. 2schematically illustrates aspects with respect to the system200including a motorized actuator201and loads211,212. For example, the load211could be associated with headrest111, e.g., a locking mechanism of the headrest111or another actuation mechanism. A cable221is provided which moves and thus provides a stroke to actuate the load211. The load212could be associated with the backrest112, e.g., a locking mechanism of the backrest112or another actuation mechanism. A cable222is provided which moves and thus provides a stroke to actuate the load212. For example, the cable221and/or the cable222may be Bowden cables.

FIG. 2schematically illustrates a reference implementation of the system200. Here, the motorized actuator201is required to provide a force259which is twice as large as the individual resistances251,252imposed by the loads211,212. This finding can be motivated by the time-domain profile illustrated inFIG. 3.

FIG. 3schematically illustrates aspects with respect to the time-domain profile of the force259provided by the motorized actuator201in the scenario ofFIG. 2. Increasing times also correspond to increasing strokes of the cables221,222. The motorized actuator201pulls the cables221,222over the course of time by providing the force259.

FIG. 3schematically illustrates the absolute values of the force259provided by the motorized actuator201, as well as the absolute values of the resistances251,252(dotted and dashed lines, respectively) of the loads211,212, respectively.

As illustrated inFIG. 3, both, the resistances251,252show the same qualitative behavior. Hence, over the course of time—which corresponds to progressing actuation of the loads211,212—both resistances251,252increase at substantially the same duration and reach a maximum value. Durations during which the resistances251,252adhere the respective maximum values overlap. To overcome the resistances251,252, the motorized actuator201is required to provide the force259which essentially corresponds to the sum of the resistances251,252. The motorized actuator201and the loads211,212are coupled directly. Hence, the force259takes a large absolute value. This makes design of the motorized actuator201complex and costly. Hereinafter, techniques are described which enable to reduce the maximum value of the force259that is provided by the motorized actuator201.

FIG. 4schematically illustrates a system200according to various examples. Again, the motorized actuator201is required to provide a force259. However, force259can be smaller if compared to the scenario ofFIG. 2. In particular, due to a device219mediating actuation of the loads211,212by the motorized actuator201, it is possible to dimension the force259to correspond to the larger one of the maximums of the resistances251,252. The motorized actuator201and the loads211,212are coupled indirectly. The device219may be configured to sequence the actuation of the loads211,212; then, the device219may be referred to as sequencing device219. In other examples, the device219may also be configured to limit the sum of forces output to the loads211,212; then, the device219may be referred to as limiting device219. A cable223is provided between the motorized actuator201and the device219, e.g., a Bowden cable.

FIG. 5schematically illustrates aspects with respect to the time-domain profile of the force259provided by the motorized actuator201in the scenario ofFIG. 4. Increasing times also correspond to increasing strokes of the cables221-223. As will be appreciated from a comparison ofFIGS. 5 and 3, the overall stroke281provided by the motorized actuator201is larger in the scenario ofFIGS. 4 and 5as if compared to the scenario ofFIGS. 2 and 3.

As illustrated inFIG. 5, the resistances251,252imposed by the loads211,212and counteracting the force259show a different qualitative behavior. Hence, over the course of time—which corresponds to progressing actuation of the loads211,212—the resistances251,252increase at substantially different durations and also reach their maximum values at different points in time. This is the sequencing provided by the device219. Durations during which the resistances251,252adhere the respective maximum values do not overlap. Therefore, to overcome the resistances251,252, the motorized actuator201is required to provide the force259which essentially corresponds to the sum of the resistances251,252—however, due to the sequencing, this sum takes comparably small values (for illustration, the maximum value of the force259in the scenarios ofFIGS. 2 and 3is illustrated by an arrow inFIG. 5).

FIG. 6illustrates aspects with respect to the device219.FIG. 6is a top view of the device219. The device219includes a housing301. InFIG. 6, the housing301is only partially illustrated so as not to obstruct the view of a link320which is displaceably arranged within an internal cavity302of the housing301.

FIG. 6illustrates a start position291of the link320. Here, the link320is arranged in a bottom part of the cavity302of the housing301. From the start position291, the link320may displace to a stop position (not shown inFIG. 6).

The inset (dashed lines) ofFIG. 6provides an enlarged view of the link320. The link320may be made from plastic or metal. The link320is integrally formed; or may be made from two or more parts. The link320is made from rigid material. The link320does not include any transmission or elastic element in the example ofFIG. 6.

The link320includes a curved outer surface341. The curved character of the outer surface341facilitates displacement of the link320within the cavity302, in particular rotation and translation of the link320. For this, the outer surface341is shaped corresponding to the shape of an arching surface331of the housing301. The arching surface331is configured to guide the displacement of the link320from the start position291to the stop position. For this, the arching surface331is in contact with the curved outer surface341of the link320.

Illustrated inFIG. 6is also a further surface332of the housing301. The further surface332is in contact with a further curved outer surface342of the link320. The surface341and the surface342are on opposite sides of the link320. Also the surfaces332,342guide the displacement of the link320.

The link320includes an input port323. The input port323is configured to receive an input force269which equals the force259provided by the motorized actuator201. For this, the input port323is connected with the cable223leading towards the motorized actuator201(the motorized actuator201is not illustrated inFIG. 6). For example, a connection providing a degree of freedom relating to rotation of the respective end of the cable223with respect to the input port323may be employed.

The link320further includes an output port321. The output port321is configured to provide an output force261based on the input force269. The output port321is connected with the cable221leading towards the load211, e.g., by crimping or pressure fit or adhesive connection. Thus, the output force261has to counteract the resistance251imposed by the load211. Thus, the output port321is connected to the load211via the cable221. For example, a connection providing a degree of freedom relating to rotation of the respective end of the cable221with respect to the output port321may be employed.

The link320further includes an output port322. The output port322is configured to provide an output force262based on the input force269. The output port322is connected with the cable222leading towards the load212. Thus, the output force262has to counteract the resistance252imposed by the load211. Thus, the output port322is connected to the load212via the cable222. For example, a connection providing a degree of freedom relating to rotation of the respective end of the cable222with respect to the output port322may be employed.

The ports321-323are arranged at fixed distances with respect to each other. The ports321-323are rigidly connected to the link320, i.e., are fixedly located in the reference coordinate system of the link320.

Now referring toFIGS. 6-9, the dynamics of the displacement of the link320are described. The dynamics of the link320is caused by a stroke of the cable223provided by the motorized actuator201. The dynamics of the link320causes a stroke of the cables221,222. Thus, the link320mediates actuation of the loads211,212.

The arching surface331guides a rotation of the link320which is triggered by the stroke of the cable223, i.e., by the input force269. The arching surface331and the cavity302define a rotational axis93of this rotation of the link320. The rotational axis93is oriented perpendicular to the drawing plane ofFIGS. 6-9. The rotational axis93is oriented perpendicular to, both, directions of the movement, i.e., perpendicular to, both, the x-axis91, as well as the y-axis92(the x-axis91is defined in parallel to the orientation of the input force269).

The link320is configured to rotatably displace/swivel between the start position291and the stop position294(cf.FIG. 9), in the example ofFIGS. 6-9by a rotation of 90°. Generally, a smaller or larger rotation would be possible, e.g., a rotation not smaller than 45° or a rotation not smaller than 80°. Hence, the rotation may be in the range of 45°-135°, optionally in the range 80°-100°. Specifically, it has been found that a rotation in the range of 80°-100° has the following advantageous effect. On one side, the rotational contribution to the displacement of the link320is comparably large; on the other side, excessive rotation—which may lead to jamming of the link320in the stop position294—is avoided. Hence, the rotation in the range of 80°-100° helps to tailor the trade-off between (i) maximized load sequencing and load limiting; and (ii) reliable kinematics of the link320without jamming can be achieved.

As can be seen, upon applying the input force269, the link320generally translates along the x-axis91. The link320further rotates within the plane of the x-axis91and the y-axis92. The displacement of the link320thus includes a superposition of a translation and a rotation.

The center of rotation94is illustrated in the inset ofFIG. 6. The center of self-rotation94corresponds to the input port323in this example: This is because the input port is only moved along the x-axis91, cf. dashed-dotted lines inFIGS. 7 and 8.FIGS. 7 and 8illustrate intermediate positions292,293of the displacement of the link320, whereasFIG. 9illustrates the stop position294. In other words: the input port323does not move along the y-axis92. Thus, the link320can be said to rotate around the center of rotation94corresponding, in the illustrated example, to the input port323.

The rotational and translational displacement of the link320causes movement of the ports321-322along the x-axis91and the y-axis92, respectively. In particular, different strokes can be provided to the loads211,212by appropriately configuring the displacement of the link320. This facilitates sequenced actuation of the loads111,112or load limiting.

FIGS. 10 and 11illustrate movement of the ports321,322along the x-axis91(cf.FIG. 10) and the y-axis92(cf.FIG. 11), respectively. FromFIG. 10it is apparent that the distance421by which the port321is moved along the x-axis91is smaller than the distance422by which the port322is moved along the x-axis91. In the example, the distance421is less than 50% if compared to the distance422. Generally, the distance421may not be larger than 80% of the distance422, optionally not larger than 50%, for optionally not larger than 20%.

In the examples ofFIGS. 6-9, the distance422equals 26.5 mm and the distance421equals 14 mm; this is an example configuration only and different distances421,422can be achieved by different designs of the arching surface331and the eccentricities of the output ports321,322.

On the other hand, fromFIG. 11, it is apparent that the distance431by which the port321is moved along the y-axis92—i.e., perpendicular to the direction along which the motorized actuator provides the input force269—is larger than the distance432by which the port322is moved along the y-axis92.

By the differences between these distances421,422,431,432, it is possible to provide different strokes to the cables321,322, i.e., different strokes for actuation of the loads211,212.

The differences between these distances421,422,431,432are caused by the different curvatures of the curves inFIGS. 10 and 11. The curvatures of the curves inFIGS. 10 and 11are caused by the rotation of the link320. The curvature of the curves inFIGS. 10 and 11is at least partly defined by the curvature of the arching surface331. The curvature of the curves inFIGS. 10 and 11is further at least partly defined by a distance between the respective output ports321,322from the center of self-rotation94, i.e., the input port323in the illustrated examples. Thus, the difference between the distances421and422, as well as the difference between the distances431and432is achieved by the distanced arrangement of the output ports321and322with respect to each other on the link320. In particular, the output port321is arranged at a larger distance along the x-axis91in the start position291from the input port323if compared to the distance along the x-axis91and in the start position291between the output port322and the input port323. The results in the different distances421,422,431,432, because the output port321is affected earlier by the rotation of the link320about the center of self-rotation94than the output port322when displacing from the start position291to the stop position294. More generally, the ports321,322may be arranged at different fixed distances with respect to the center of self-rotation94of the link320. Therefore, the same rotation—of, e.g., 90° in the scenario ofFIGS. 6-9—results in a different movement of the ports321,322along the x-axis91and the y-axis92.

For example, the output port321is arranged adjacent to the arching surface331and in between the arching surface331and the input port323in the start position. In particular, the output port321is offset along the y-axis92from the input port323. Thereby, a torque is applied to the link320due to the resistance251counteracting the output force261in response to providing the input force269. This facilitates the rotation of the link320about the rotational axis93.

In the example ofFIGS. 6-9, also the output port322is offset from the input port323along the y-axis92. However, this offset is optional. In the example ofFIGS. 6-9, the output port322is arranged in between the output port321and the input port323. In other words, the output port322is arranged close to the center of rotation94, in particular closer than the output port321. Thus, the movement of the output port321is affected more strongly by the rotational component of the displacement of the link320if compared to the movement of the output port322(cf. stronger deviation of the shape of the curve321from linear inFIG. 10, if compared to curve322). Thus, the port321is arranged with a comparably large eccentricity with respect to the center of rotation94. This causes the comparably small movement432of the output port322along the y-axis92—and a large effective stroke.

The arching surface331includes a section338and a further section339. The section338is in contact with the surface341of the link320in the start position291while the section339is in contact with the surface341of the link320in the stop position294. As will be appreciated fromFIGS. 6-9, the section339has a larger component which is aligned in parallel with the y-axis92; while, in fact, in the examples ofFIGS. 6-9, the section338does not extend at all along the y-axis92, but only along the x-axis91. Hence, the section339extends partially along the y-axis92.

Due to this configuration of the arching surface331, the counterforce associated with the output force261and provided by the load211is absorbed to a larger degree the more the link320has rotated about the rotational axis93, respectively the more the link320has displaced from the start position291towards the stop position294. In other words, in the stop position294, the load211may be effectively decoupled from the motorized actuator201, e.g., if the arching surface331is fully parallel to the y-axis92. The load211may also be partly decoupled from the motorized actuator201, e.g., if the arching surface331is partly parallel to the y-axis92. Then, the resistance251imposed by the load211to the input force269, i.e., to the force output by the motorized actuator201, decreases. Then, the motorized actuator201has to provide a smaller force259and the input force269decreases accordingly (cf. falling edge298inFIG. 5). This facilitates load limiting. Furthermore, this may facilitate sequencing of the actuation of the loads211,212.

By means of the difference in the distances421,422, it is possible to implement actuation of the loads211,212using different strokes. In particular, the load212is actuated using a larger stroke than the stroke used for actuating the load211. This can be used to facilitate the sequencing of the resistances251,252imposed by the loads211,212(cf.FIG. 5): For example, the load212can be configured to provide the resistance252which varies with the movement of the link320along the x-axis91from the start position291to the stop position294. For example, the load212may be configured to provide the resistance252which increases with progressing movement along the x-axis91from the start position291to the stop position294. A step-wise profile is possible (cf.FIG. 5, where the step299is illustrated). Then, the resistance252may be small initially—while the resistance251to the input force269is large—and may be large subsequently—while the resistance251to the input force is small.

Hence, as will be appreciated, two effects may contribute to the sequencing of the resistances251,252: (I) The falling edge298of the resistance251opposing the input force269is achieved by the rotation of the link320about the rotational axis93. Here, resistance259is effectively reduced, because at least a fraction of the corresponding output force261is absorbed or provided by the arching surface331when the link320rotatably displaces towards the stop position294. (II) Differently, the postponed rising edge299of the resistance252opposing the input force269is achieved by an appropriate configuration of the load212. Here, the load212can be configured to provide the rising edge299of the resistance252only for increased strokes, i.e., only for progressing movement of the output port322along the x-axis91. There are different scenarios conceivable to implement such a stroke-dependent resistance252. One example is illustrated inFIG. 12.

FIG. 12illustrates aspects with respect to load sequencing. In particular,FIG. 12illustrates aspects with respect to the Bowden cable222used to actuate the load212. The Bowden cable222has a first end attached to the output port322and further has an opposing second end550. The opposing second end550in connected to the load212by a loose fit. The loose fit is configured to provide the resistance252which varies with said movement of the output port322along the x-axis91. The loose fit is implemented by the distance282between a nipple501of the inner wire502of the Bowden cable and a fixed stop511of the load212to engage with the nipple once the nipple has traveled by the distance282. For example, the fixed stop511can implement a part of an actuation member such as a locking mechanism or a displacement mechanism.

Such techniques as described in connection withFIG. 12are not required if mere load limiting functionality is desired, but no load sequencing.

FIG. 13is a top view of the device219according to the examples ofFIGS. 6-9.FIG. 13illustrates the trajectory of output port321in the xy-plane due to displacement291of the link330from the start position291to the stop position294(thick full line inFIG. 13).

FromFIG. 13it is apparent that the output port321shows a significant movement along the y-axis92. The movement along the x-axis91, on the other hand, is limited. This facilitates for the load-dependent stroke.

FIGS. 14A and 14Bare perspective views of the device219according to the examples ofFIGS. 6-9.FIG. 14Aillustrates the device219with a closed lid of the housing301sealing the cavity302. InFIG. 14B, the lid is not shown.FIG. 14Billustrates the link320in, both, the start position291, as well as the stop position294for illustrative purposes.

FIGS. 15 and 16are top views of a further example implementation of the device219. In the example ofFIGS. 15 and 16, the device219is integrated within the motorized actuator201such that the input force269is provided via a fixed shaft223. Furthermore, in the example ofFIG. 15, the input port323and the output port322are co-located, i.e., the distance322A is zero. The distance321A between the output port322and the output port321in the star position291and along the x-axis91is also indicated and is larger than zero. In the example ofFIGS. 15 and 16, the arching surface331includes a stepwise profile between the sections338,339.

FIG. 17is a flowchart of a method according to various examples. In5001, a link is displaced. Said displacement may have include a rotation and a translation. The displacement may cause movement of various ports of the link, e.g., of an input port, a first output port, and a second output port.

The input port may be configured to receive an input force oriented along a given axis. The output ports may move by different distances along the given axis. Thus, different strokes are implemented for first and second loads connected to the first and second output ports, respectively. Movement along a further axis perpendicular to the given axis is caused by the rotation. This movement does not convey an output force, because it is oriented along a direction orthogonal to the direction of the input force.

FIG. 18illustrates aspects with respect to the device219.FIG. 18is a top view of the device219. The device219includes a housing301. InFIG. 18, the housing301is only partially illustrated so as not to obstruct the view of a link320which is displaceably arranged within an internal cavity302of the housing301.

The device219of the example ofFIG. 18generally corresponds to the device219of the example ofFIG. 6. In the example ofFIG. 18, however, the input port323is co-located with the output port322(as already explained in connection withFIG. 15). This is particularly visible in the inset ofFIG. 18(marked with the dashed lines).

By co-locating the input port323and the output port322, it is possible to increase and potentially even maximize the distance422. Hence, the load212can be actuated with a large stroke.

Further, by co-locating the input port323and the output port322, it is possible to re-use a single cable for transporting, both, the input force269, as well as the output force262. In other words, it is possible that the cable223and the cable222are integrally formed. Then, only a single connection between that cable222,223and the link320is required, e.g., a single act of crimping or pressure fit or adhesive connection. Now referring toFIGS. 19-21, the dynamics of the displacement of the link320according to the example ofFIG. 18are described. Here,FIG. 19generally corresponds toFIG. 7.FIG. 20generally corresponds toFIG. 8.FIG. 21generally corresponds toFIG. 9.

The link320according toFIGS. 18-21also illustrates a further feature that helps to facilitate reliable movement of the link320between the various positions291-294. From a comparison ofFIGS. 9 and 21, it is apparent that, inFIG. 9, the surface331and the surface332form a V-shaped groove, i.e., the surface332is tilted away from the arching surface331; while inFIG. 21, the surface332is tilted towards the arching surface331.

By adjusting the tilt angle between the respective surface tangents331A and332A (cf.FIGS. 9 and 21) of the surfaces331,332, the friction required to be overcome when releasing the link320from the stop position294towards the start position291can be tailored. Depending on the design constraints, this can help to achieve reliable dynamics and low wear-out. For example, there can be a tendency that when using the V-shaped groove design ofFIG. 9, the friction required to be overcome to release the link320is higher than for the design ofFIG. 19. This can lead to jamming of the link320in the stop position294.

The tilt of the tangents331A and332A can be implemented separately from the co-location of the input port323and the output port322, even illustration in conjunction inFIG. 18.

In the scenarios ofFIGS. 18-21, the section339of the surface331in contact with the link320in the stop position294(cf.FIG. 21) is fully aligned with the y-axis92—which is different, e.g., from the scenario ofFIG. 6. Such a configuration helps to provide stability to the link320in the stop position294, while still avoiding jamming of the link320.

FIGS. 22-24illustrate further details with respect to the device219ofFIGS. 18-21. Here,FIG. 22generally corresponds toFIG. 13;FIG. 23generally corresponds toFIG. 14A; andFIG. 24generally corresponds toFIG. 14B. InFIG. 24, a lower part320-2of the link320is illustrated; a scenario in which the link320is made from two parts, the lower part320-2and an upper part (not illustrated inFIG. 24) is generally optional. Details of such a two-part implementation of the link320are also illustrated inFIG. 25.

FIG. 25illustrates aspects with respect to the link320. In particular,FIG. 25illustrates an implementation of the link320including two parts, i.e., an upper part320-1and a lower part320-2. Both parts320-1,320-2extend in the xy-plane.

The upper part320-1includes an upper surface711configured to slide along a respective inter-related sliding surface of the housing302; the lower part320-2includes a lower surface711configured to slide along a respective inter-related sliding surface of the housing302. The sliding surfaces (not illustrated inFIG. 25) defined the upper and lower boundaries of the cavity302. To facilitate sliding, the surfaces711,712and the sliding surfaces are preferably flat.

In the example ofFIG. 25, the outer contours of the parts320-1,320-2in the xy-plane are the same.

To facilitate the connection of the various cables221-223, it is possible that the two parts320-1,320-2are joined together/engaged with each other (cf.FIG. 26) and, by engaging the parts, the cables221-223are fastened at the ports321-323to the link320. As illustrated inFIG. 25, both parts320-1,320-2include inter-related engagement features701,702(also cf. inset ofFIG. 18andFIG. 24). In the illustrated examples, the engagement features701,702are configured for a clip connection (cf.FIG. 28) and a screw fitting (cf.FIG. 27).FIG. 28implements, in particular, a barbed hook clip connection.

For example, both parts320-1,320-2may include recesses that facilitate attachment of fixation means to attach the cables321-323, e.g., for screws, crimps, etc. The connection to the cables321-323is illustrated inFIG. 29. InFIG. 29, the end caps721,722of the Bowden cables are arranged in recesses—implementing the ports321-323—formed in the parts320-1,320-2and fastened to the link320. Then, it would be possible to fixate the cables221-223by joining together the two parts320-1,320-2, e.g., using a pressure fit, at the ports321-323. Thus, first the cables221-223are inserted, e.g., into the respective recesses of the lower part320-1; then the upper part320-2is engaged with the lower part, with the cables221-223already attached to the lower part320-2. This fastens the cables221-223to the ports321-323. The ports321-323, in a state in which the parts320-1,320-2are joined together, can define cavities enclosing the end caps of the Bowden cables.

FIG. 29also illustrated the lower sliding surface750of the housing301.

While inFIG. 25a scenario is illustrated in which the two-part link320is implemented for co-located ports322,323, similar techniques may be readily applied for a scenario in which the ports322,323are not co-located. Where the co-located ports322,323are used, a two-part link320as illustrated inFIG. 25further facilitates the ease of assembly, specifically in view of the possibility to have the cables222,223integrally formed.

For illustration, while various examples have been described with respect to loads associated with a backrest and a headrest of a seat, these techniques are not restricted to such applications. Application of the techniques described herein to other types of loads are possible.

For further illustration, above various examples have been described with respect to actuating locking mechanisms, i.e., unlocking locking mechanisms. In other examples, it would be possible to implement different kinds and types of actuation mechanisms.

For further illustration, above techniques have been described with respect to actuating actuation mechanisms which are associated with two separate displaceable parts, e.g., a headrest and a backrest, i.e., different parts which perform different displacements in response to said actuating (cf.FIG. 1). These displacements may be enabled by actuation of a locking mechanism; the energy for performing the displacement may or may not be provided by the motorized actuator. In some examples, separate energy-storage means such as springs etc. may be employed for said displacing. In some examples, it would be possible that multiple load-implementing actuation mechanisms of a single displaceable part are actuated. Then, the single displaceable part can displace in response to actuation of the actuation mechanisms, e.g., again powered by the motorized actuator and/or separate energy storage means. I.e., a single displacement action may be triggered by—e.g., sequentially—actuating the two loads. For example, it would be possible to actuate two actuation mechanisms which result in a common displacement of a load. For example, a headrest may be provided with two locking mechanism, e.g., associated with different linear support members. Then, only once the two locking mechanisms have both been sequentially actuated, i.e., unlocked, the headrest may displace. Also in such a scenario, the load sequencing as described herein may help to reduce the maximum force that is required to be provided by the motorized actuator. While only a single displacement may be resulting from multiple actuations, it is still possible to trigger the displacing with low latency if the load sequencing is implemented on a short timescale, e.g., seconds.

For further illustration, various examples have been described where an arching surface of the housing of the device is provided to guide the displacement of the link. In other examples, the arching surface may be provided by the link, e.g., as a guide slot through which a rod of the housing extends through.

For further illustration, various examples have been described which illustrate displacement of the link from the start position to the stop position. However, the displacement of the link can be reversible. The link may displace from the stop position to the start position, e.g., in a reciprocal manner if compared to the displacement from the start position to the stop position.

For still further illustration, various examples have been described in which actuation of the loads is sequenced in time-domain, i.e., load sequencing. Here, the rising edges of the resistances of two loads are offset in time-domain (cf.FIG. 5). However, in other examples, it may be possible that the rising edges of the resistances of the two loads are not offset in time-domain, but at least partially overlapping in time-domain. Here, a load-limiting functionality may be implemented, because the output force provided to one of the two loads is limited by the rotation of the link. This also limits the input force required to be provided by a motorized actuator. Further, the time-integrated output forces provided by the motorized actuator to the two loads over the course of actuation may differ from each other, e.g., due to the different strokes. This also effectively limits the maximum force and the time-integrated force required to be provided by the motorized actuator.

For still further illustration, various examples have been described in which load limiting and/or load sequencing is employed. In some examples, the techniques described herein may be useful for any actuation of two loads that require two different strokes. In other words, it may not be required to limit the load imposed on the motorized actuator, e.g., by sequencing as described herein. Advantageous effects may already be obtained in connection with actuating different loads with different stroke