NL2028166B1

NL2028166B1 - Agricultural device

Info

Publication number: NL2028166B1
Application number: NL2028166A
Authority: NL
Inventors: Jan Klompe Adrie; Germein Hertogh Koen
Original assignee: Fieldworkers B V
Priority date: 2021-05-06
Filing date: 2021-05-06
Publication date: 2022-11-23

Abstract

The present invention relates to an agricultural device comprising a mobile frame comprising at least two wheels, at least one carrying structure configured to carry at least one person, preferably in a substantially lying position, at least an electric drive configured to drive at least one wheel and a primary control unit configured to at least control the actuation and/or energy supply of the electric drive wherein it is enables that the primary control unit can alter the energy supply of the electric drive.

Description

Agricultural device The present invention relates to an agricultural device. The invention also relates to the use of such an agricultural device. The present invention further relates to an assembly of at least one primary control unit and at least one secondary operating element for use in an agricultural device according to the present invention. Weed control is an important part of the activities in agriculture. A common method to control weed is the use of pesticides and its use might be effective, but it has a lot of downsides as well. Not only the weeds are damaged or killed, also other organisms can be affected by the pesticides. The use of pesticides is certainly not desirable in organic farming. An alternative is to remove the weeds by hand. A disadvantage of this is that manual removal of weeds is rather time-consuming. Furthermore, agricultural workers in charge of this job often suffer from back pain or pain in the knees or shoulders since it is difficult to perform this type of manual work in an ergonomically sound position. As a solution, mechanical machines can be used to remove weeds. A machine according to the prior art applies rotating weeding elements for weed control. A limitation of such machine is that herewith only weeds that are growing between the rows of crops can be removed and that the weeds that are in the same row as the crops remain. For the (remaining) weeds that are close to the crops, it is possible to use intra-row-weeding machines. These machines use cameras and/or light sensors to detect where the crops are and controls the weeding element tools to avoid these detected spots. The machine uses for example two blades that are pneumatically sent in and out of the row.

Difficulties arise since the sensitivity of the camera can be either too sensitive such that some weeds will be detected as crops, or not sensitive enough with damage to the crops as a result. With the use of an intra-row-weeding machine it is likely to damage some of the crop itself as well, which decreases the output of the land. This has a negative effect on the costs for the farmer and consequently for the consumer. Therefore, manual control of weeds is still a preferred option for several agricultural fields. It is for example known to use a weeding platform for manual weed control, usually with six to twelve workers lying on a cart face down at a convenient distance from the land such that they can remove weeds by hand. The lying position significantly improves the working position for the workers when compared to a standing position. The weeding platform is usually trailed behind a vehicle, such that it can be moved over the land with a desired pace during which the land is cleared of weeds by the workers. The disadvantage of this weed control is that the weeds are not evenly distributed over the land resulting in that a few workers may be very busy to keep up with the pace whilst others can easily complete weed removal in their row. As a result of this, some workers might not be able to keep up with the set pace wherefore it is conceivable that not all weeds can be removed. It is a goal of the invention to provide a weed control solution which takes away at least one of above-mentioned disadvantages or to at least provide an alternative to the known solutions. The invention thereto provides an agricultural device, comprising at least one (wheeled) mobile frame comprising at least two wheels, at least one carrying structure configured to carry at least one person, preferably in a substantially lying position, at least one electric drive configured to drive at least one wheel, at least one primary control unit configured to at least control the actuation and/or energy supply of the electric drive and at least one secondary operating element which can be operated in at least an initial state and an activated state, wherein at least one secondary operating element and at least one primary control unit are included in at least one electric circuit, wherein activation of at least one secondary operating element into the activated state causes a circuit change of said electric circuit such that the primary control unit alters (at least) the energy supply of the electric drive resulting in a velocity change of the device.

The agricultural device according to the present invention has several benefits over the conventional devices. The combination of at least one electric drive which is configured to drive at least one wheel of the device, at least one primary control unit configured to at least control the actuation and/or energy supply of the electric drive and at least one secondary operating element enables that the speed of the device as such and thus the effectiveness of manual agricultural activities can be efficiently controlled. Due to the presence of at least one secondary operating element and at least one primary control unit which are included in at least one electric circuit, wherein activation of at least one secondary operating element into the activated state causes a circuit change of said electric circuit such that the primary control unit alters the energy supply of the electric drive resulting in a velocity change of the device, it is enabled to temporarily reduce the velocity and/or stop the agricultural device thereby facilitating the device to be longer in the same region.

This enables for example that more time for manual actions is available at a position having excess weed growth.

The device is preferably configured such that a user carried by the carrying structure can activate at least one secondary operating element during conventional use.

During conventional use, the at least one primary control unit controls the actuation and/or energy supply of the electric drive and the at least one secondary operating element is then in its initial state.

When in the initial state, the secondary operating element does not affect the primary actions of the primary control unit and/or the electric drive.

However, activation of the secondary operating element into an activated state will (indirectly) cause a velocity change of the device since the circuit chance caused by said activated state alters the energy supply of the control unit to the electric drive.

Hence, depending on the instructions of the control unit and on the state of the at least one secondary operating element, the at least one electric drive causes the device to move at a predetermined standard operating velocity, to slow down or to speed up its velocity or possibly to substantially fully pause the device.

In practice this means that in a normal operation mode, meaning when the secondary operating element is in an initial state and the device is in a driven operational mode, the device moves forward at a predetermined standard operating velocity.

When the secondary operating element is in an activated state, the change caused in the electric circuit results in a change of the instructions of the control unit towards the electric drive.

In particular, the co-action between the secondary operating element and the primary control unit is configured such that the control unit causes a change in the energy supply towards the electric drive, preferably resulting in a decrease of the velocity of the device.

Once the actuation and/or energy supply to the electric drive decreases or temporarily stops, the power of the electric drive will be reduced or even stopped which results in a reduced velocity of the device.

Further, the resistance of the field onto the wheels might cause that the velocity of the device further decreases, possibly even to substantially zero km/h.

Typically, when the secondary operating element is returned back from the activated state into the initial state, the primary control unit will again regulate the full control of the electric drive. Hence, once the secondary operating element is returned back into the initial state the secondary operating element will no longer affect the instructions of the primary control unit towards the electric drive. The at least secondary operating element may be connected with the electric circuit either wired or wireless.

The altered energy supply towards the electric drive typically lasts as long as the secondary operating element is in the activated state. In this manner, the user (person on the carrying structure) can basically control the duration of the altering of the velocity change in a relatively simple manner. Once the necessary time has passed, the secondary operating element may be returned to the initial state resulting in the energy supply towards the electric drive being returned to its initial value.

The device comprises at least one mobile frame which is in particular configured to move along a crop row. The device according to the present invention is configured for carrying at least one person, in particular in a substantially lying position across a field, for example linearly above a crop row, and is suitable for several agricultural activities. The carrying structure which is configured to carry at least one person preferably in a substantially lying position provides an ergonomic working position for said person, in particular above a crop row. An ergonomic working position is advantageous for the personal health and the person's ability to perform its job. Typically, a person is lying in a face down configuration upon the carrying structure. The carrying structure extends in an operational mode substantially horizontally above a crop row. The carrying structure preferably comprises at least two parts, carrying the main body and the forehead respectively.

A person lying on said carrying structure may extend its arms in the direction away from the carrying structure, typically towards a field, such that said person may extend its arms towards the crops or weeds on said field to perform actions such as manual weeding. In an operational mode the device moves substantially linearly at a predetermined standard operational velocity, such that a person carried by the carrying structure can focus on the location below the device to perform the necessary manual actions. This configuration facilitates a precise and ecological land cultivation. The device comprises at least one electric drive which is electrically connected with 5 the primary control unit. The use of an electric drive is advantageous from environmental point of view but also for health reasons as such drive does not emit exhaustion gasses. This is advantageous for both workers and crops. The energy supply of the electric drive and/or of the control unit may be supplied by at least one battery (pack). At least one battery may be charged during use of the device, for example by power from a solar panel. lt is also conceivable that at least one battery is detachable from the device, having the advantage that it may be recharged when it is not mounted on the device and that its weight can be removed from the device. Another advantage is that the device without the battery may have an allowable weight for transport behind a vehicle on the public road, such as a personal car.

The device according to the present invention is particularly advantageous for activities which require a local (manual) approach, such as weeding, harvesting, removing buds, removing or picking flowers and/or pollinating. The device can also be referred to as a lay down weeder. The device can also be referred to as a self- propelled device. In a preferred embodiment the primary control unit comprises an implemented software program, which may activate depending on the state of the secondary operating element. The activated state of the at least one secondary operating element activates at least one element in the software program, which causes the electric drive to go into a freewheeling mode, resulting in detachment of the electric drive with the energy supply, which means that the device will basically temporarily pause. lt is also possible that another software program is activated, for example to slow down the device to a second predetermined operating velocity or accelerate to a third predetermined operating velocity. In a preferred embodiment of the device according to the invention, activation of at least one secondary operating element causes a circuit change of said electric circuit such that the primary control unit reduces the energy supply of the electric drive resulting in a velocity reduction of the device. A reduced velocity of the device provides more time for the user(s) to perform their actions which is beneficial for improved quality of the work and the efficiency of the work. It is also beneficial for a person using the device, because it is easier to work longer hours.

In a further preferred embodiment, activation of at least one secondary operating element causes a circuit change of said electric circuit such that the primary control unit at least temporarily interrupts the energy supply of the electric drive resulting in a velocity reduction of the device. Said interruption may last as long as the secondary operating element is in the activated state, such that the user (person on the carrying structure) may decide each time the amount of time necessary to keep the secondary operating element in the activated state. Once the necessary time has passed, the secondary operating element may be returned to the initial state. When the secondary operating element is back in its initial state, it will no longer affect the interaction between the primary control unit and the electric drive. Hence, the primary control unit will continue to regulate the activation and/or energy supply of the electric drive as was done prior to the interruption and more in particular such that the device will be returned to an initial, predetermined velocity.

In a possible embodiment of the device according to the invention, the at least one secondary operating element is a binary element. Non-limiting examples thereof are a push button and/or a (light) sensor. Activation of at least one secondary operating element causes either a connection or disconnection of said electric circuit such that the primary control unit alters the energy supply and/or actuation of the electric drive. Whether the activated state of the secondary operating element will cause a disconnection of the electric circuit or if this will cause that the electric circuit is closed depends on the type of electric circuit applied. As indicated above, it is basically the change in the electric circuit which will trigger the altering of regulation done by the primary control unit. For example. in an activated state of the secondary operating element the electric circuit can be interrupted and thus a zero voltage signal is received by the primary control unit. The primary control unit is configured such that the energy supply of the electric drive is altered when a zero voltage signal is received. The opposite configuration is also possible wherein the energy supply is altered upon a signal received by the primary control unit in case the electric circuit is closed upon activation of the secondary operating element. It is advantageous when a binary element is used, because it is a relatively simple, robust and cheap operating element. In a preferred embodiment of the device according to the invention, at least one secondary operating element comprises at least one switch, in particular at least one momentary switch. This may be for example a momentary contact switch. The switch may comprise at least one spring, in particular a compressible spring. The use of a (compressible) spring is beneficial as this may enables that the switch will return to its initial state in a relatively simple manner. It is for example conceivable that once the switch is not actively kept in its activated state, the switch will automatically return back to the initial state. This may improve ease of use and/or the user friendliness of the secondary operating element. This may contribute to a more intuitive use of the secondary operating element.

In a further embodiment of the device according to the present invention, the electric circuit is a signal circuit, in particular a DC signal circuit. Typically, the signal circuit uses a 5V signal. A 5V DC power supply can provide a reliable and stable power supply for the present application. A signal circuit further benefits of being relatively energy efficient, wherefore the implementation of at least one secondary operating element will not significantly affect the overall performance of the device, and in particular of the electric drive.

In a possible embodiment of the device according to the present invention, the primary control unit comprises at least one timer. The control unit is preferably configured such that activation of at least one secondary operating element triggers said timer for a predetermined time period in order to alter, and in particular reduce, the energy supply of the electric drive. Altering of the energy supply may then subsequently result in a velocity change of the device. Activation of at least one secondary operating element into the activated state may also trigger the control unit to fully stop the energy supply to eventually pause the device, wherein the timer may be used to stop the energy supply for a predetermined period of time. The use of a timer may also contribute to a smooth transition between different operating states of the device.

In a further embodiment of the device according to the present invention, the secondary operating element comprises at least one mechanical timer. Said mechanical timer may comprise at least one compressible spring. The mechanical timer may contribute to return of the secondary operating element from the activated state to its initial state. It is conceivable that the mechanical timer is configured to keep the secondary operating element in its activated state for a predetermined time period upon activation of said secondary operating element. The user then might only need to activate the secondary operating element once to alter the velocity of the device for a certain time period and is not forced to continuously keep the secondary operating element in its activated state. The use of a mechanical timer is a relatively cheap and maintenance friendly solution. The at least one primary control unit is configured to at least control the actuation and/or energy supply of the electric drive. Preferably, the primary control unit is configured to control the electric drive such that the device can move forward (or backward) with a standard operating velocity. The standard operating velocity lies typically in the range of substantially 0 km/h, for example 0.0001 km/h, to 2 km/h, preferably in the range of 0.1 km/h to1.25km/h, more preferably 0.3 km/h to 0.7 km/h and more preferably substantially 0.6 km/h. In an operating state the device will typically move forward at a constant standard operating velocity. It is possible to adjust the constant standard operating velocity by manual operation of the primary control unit prior and/or during use. Since most crops are placed in lines on a field, it is advantageous when the device is at least displaceable in at least one linear driving direction, in particular a linear forward driving direction and/or a linear backward driving direction. The primary control unit is preferably configured to control the driving direction of the device. The primary control unit may actuate the driving direction either forward or backward in said linear driving direction. It is also conceivable that the device is displaceable in multiple directions, wherein direction control of the device is regulated via the primary control unit.

In a preferred embodiment of the device, at least one carrying structure substantially extends in a linear driving direction of the device. Preferably, the carrying structure is a substantially elongated carrying structure, preferably extending in a linear driving direction. The carrying structure preferably extends such that a person positioned upon said carrying structure substantially extends in said linear driving direction.

The length over which the carrying structure extends is preferably adjustable.

The length may for example be adjusted from substantially 150cm up to 230cm, preferably between 160cm and 210 cm, in particular in order to accommodate various person's body length.

This is beneficial from ergonomic point of view and it enables efficient handling of the crops which are typically planted over a longitudinal crop row.

In a preferred embodiment, at least one secondary operating element is positioned at or near a distal end of the carrying structure such that a person positioned upon said carrying structure can activate said secondary operating element with at least one foot.

For this purpose, the secondary operating element may be positioned near a rear end of the carrying structure and/or said secondary operating element may be positioned near a rear end of the frame.

The secondary operating element may be connected with the carrying structure and/or with the frame.

The primary control unit is typically configured to be manually operated by a user, for example prior to the device being set into motion.

Preferably, the at least one secondary operating element is placed at a distance from the primary control unit, such that the secondary operating element is operable in another manner than the primary control unit.

Since the person lying on the carrying structure is preferably in a configuration facing down such that its arms may extend from the carrying structure downwards, the person must interrupt its work to use its hand for any manual operations to control the device via the primary control unit, or for example via a primary operating element of the primary control unit.

An advantage of the positioning of the secondary operating element such that it is operable with at least one foot is advantageous because it is possible to continue manual actions on the field whilst operating the secondary operating element.

The facilitation of a simultaneous operation leads to an efficient and effective operation.

Another advantage of said position is that the person can stay in its lying position while operating the secondary operating element.

A by foot operable secondary operating element is beneficial for the lying person because this is an ergonomic and safe way of operating a moving device.

It is advantageous when the location of a secondary operating element can be adjusted.

This is advantageous to accommodate differences in user's body dimensions, such as overall height or longer or shorter legs.

The user may adjust the mutual distance between a body part of the carrying structure and the secondary operating element such that it can easily operate the secondary operating element.

In a possible embodiment, the secondary operating element is (mechanically) connected to the carrying structure, preferably at the distal end of the carrying structure. The carrying structure may for example comprise a body part and a distal end, wherein at least part of the distal end of the carrying structure is extendable with respect to said body part of the carrying structure. The secondary operating element may be connected to the distal end of the carrying structure. In this embodiment it is beneficial if the mutual distance between a body part of the carrying structure and the distal end thereof is adjustable, for example by adjustment of the total length carrying structure. This can for example be done via a slideable, extendable carrying structure frame.

ft is also conceivable that the secondary operating element is (linearly) displaceable in itself with respect to the body part of the carrying structure. The mutual distance between body part of the carrying structure and the secondary operating element may be adjustable to correspond to the user’s preferences.

In a further preferred embodiment, the secondary operating element is mechanically connected to the frame and the mutual distance between the distal end of the at least one carrying structure and at least one secondary operating element is adjustable. This may for example be done by displacing the carrying structure. It is also possible that the secondary operating element is mechanically and displaceable connected to the frame, such that it is linearly displaceable. The linear displacement of the secondary operating element could adjust the mutual distance between a body part of the carrying structure and the secondary operating element.

ft is advantageous when the at least one secondary operating element comprises at least one pedal, in particular a foot pedal. A by foot operable secondary operating element allows for a fast and safe operation of the secondary operating element, while the device is in operational mode. This way it is possible for a person using the device according to the invention to continue working with their hands while controlling the secondary operating element. lt is safer because the secondary operating element enables operation of pausing or slowing down the device without the need for manual control. Thereby reducing the risk of hands getting stuck with moving parts.

In an embodiment of the present invention, the device comprises at least one visual indicator configured to provide a visual indication in case at least one secondary operating element is activated. The visual indicator may be visible for (a) user(s) of the device itself and/or for other persons approaching the device. The visual indicator may enhance the safety of the device because it may provide an indication of what to expect such that one can anticipate the movement of the device. it is possible to further improve the ergonomic position of a person using the device of the present invention. For this purpose, in an embodiment of the present invention, the position and/or angle of at least one carrying structure with respect to the frame is adjustable. The preferred position and/or angle of a single carrying structure may for example depend on a person’s arm length. In case that the device is provided with multiple carrying structures, then preferably the position and/or angle with respect to the frame of each carrying structure is individually adjustable and independent of an adjacent carrying structure. In an embodiment the length over which the at least one carrying structure extends is adjustable. This is advantageous to facilitate an ergonomic working position for persons of different length which are in a substantially lying position on the carrying structure. The adjustments described above (height compared to the field, tilted position, mutual distance between body part of the frame and secondary operating element) to fitto a person's preferences preferably do not need any tools, such that for each use it can be adjusted easily by the user. It is for example conceivable that said adjustments can be made via complementary connection members. The device according to the present invention is preferably an autonomous device. The device may be substantially fully controlled by the primary control unit. For example, the primary control unit may control the device such that it will linearly move forward at a predetermined speed.

The device may be self-propelled.

The primary control unit may comprise at least one primary operating element configured for manual control of the energy supply of the electric drive.

Preferably, the primary control unit is located substantially adjacent to a carrying structure, such that a person positioned upon said carrying structure can manually control the primary control unit.

It is also possible that the primary control unit is positioned at a distal end of the carrying structure at distance from secondary operating element.

This may be either the front or the back distal end.

The primary control unit configured for manual control may be provided with an interface which can be controlled manually.

Said interface may comprise analog and/or digital input elements for the standard operating velocity, direction of movement, forward or backward, emergency brake, on or off.

The on/off input may also be operated by the use of a key, for example a turn-key.

In a preferred embodiment of the device according to the present invention, the device without battery has a maximum weight of substantially 330 kg, preferably substantially 310 kg during transport of the device, such that it is allowed as a trailer on European roads.

Another advantage of such relatively low weight of the device is that the device may be used where the soil of the field is fragile.

Due to intensive agricultural activities soil of fields deteriorates and are less resistant to heavy machinery.

The lighter the device, the better for the soil of the field.

However, the weight and/or dimension of the device may depend on the intended purpose.

On the other hand, the weight of the device serves for an improved grip on the soil. it is beneficial if at least one solar panel is applied as an energy source for the device, and in particular for the primary control unit and/or the electric drive.

The use of at least one solar panel may omit the need for additional charging due to efficient energy use, preferably a relatively low weight construction and/or an efficient battery pack.

The at least one solar panel may be placed at several locations on the device, either in one location or a combination thereof.

In a preferred embodiment of the invention, the frame defines at least one receiving space for receiving at least one solar panel. The user of the device may choose and place a solar panel of its preference. Or its user may decide to place a solar panel in the receiving space for providing power for the electric drive. The receiving space may be placed in front, at the back or on top of the device. With the front and back being distal ends of the mobile frame and on top meaning at a distance above the carrying structure. In a preferred embodiment, the invention comprises at least one solar panel, wherein at least one solar panel is positioned at least partially above at least one carrying structure. With this position the solar panel in fact provides a shelter for the user. The at least one solar panel may be positioned on top of, or incorporated in a roof structure over the carrying structure. The roof structure may comprise a canvas or textile. Preferably the solar panel and/or roof structure substantially extends over the entire length of at least the carrying structure and preferably over the entire length of the device. The solar panel may protect (a person lying on) the at least one carrying structure from UV-radiation from sunlight and even from rainfall. The solar panel may be received in a receiving space, which receiving space defined by the frame and may be positioned at least partially above at least one carrying structure. The device may optionally comprise at least one USB-port for example for charging personal electronics, such as mobile phones and/or portable radios. This option improves the work environment of a person using the device.

In a possible embodiment of the present invention, the frame comprises at least three wheels, in particular three or four wheels, in particular positioned such that at least one front wheel is positioned at a front region of the frame and wherein at least one pair of rear wheels is positioned at a back region of the frame. The suspension of the rear wheels may be positioned at or near an opposite distal end of the frame. In a preferred embodiment the frame comprises three wheels, positioned such that one front wheel is positioned in the middie of the frame near or at a front distal end of the frame and wherein one pair of rear wheels is positioned at a back region of the frame, at or near an opposite distal end of the frame. Using three wheels instead of the conventional four wheels is advantageous because it decreases weight of the device and it decreases costs while maintaining sufficient stability and strength for the device. it is preferred that the mutual distance between at least one pair of rear wheels is adjustable. The rear wheels are adjustable between at least one compact state and at least one state of use. It is conceivable that the frame is a modular frame which is displaceable between at least a compact state and at least one state of use. The compact state may be used for transport of the device over public roads or in between fields. The mutual distance between the rear wheels in a compact state is in a preferred embodiment substantially 150 cm. The mutual distance between the rear wheels in a state of use is preferably substantially between 300 and 315 cm, in particular substantially 300 cm. The mutual distance corresponds to the pitch of the crop rows in the field. The center to center dimensions of the wheels correspond to common center to center dimensions of crop rows in the field. However, the actual preferred dimension may depend on the intended use of the device. The device may be provided with a coupling element at a distal end of the mobile frame configured to couple the device to a to a towing hook of a (motorized) vehicle.

It is advantageous if the device comprises at least one mechanical brake. The mechanical brake may be activated manually for example by a user of the device. The mechanical brake may function as an emergency stop, either automatically or manually.

The electric drive preferably comprises at least one electric motor. The electric motor is preferably configured to convert the electrical energy, which is for example supplied via at least one lithium battery, into mechanical energy. The use of an electric motor will not emit harmful exhaustion gasses and is typically relatively silent which is advantageous for both workers and crops. In a preferred embodiment of the device according to the present invention, the device comprises multiple carrying structures, wherein each carrying structure is configured to carry at least one person, preferably in a substantially lying position, and wherein the device comprises multiple secondary operating elements wherein each secondary operating element and at least one primary control unit are included in at least one electric circuit, wherein activation of at least one secondary operating element causes a circuit change of said electric circuit such that the primary control unit alters (at least) the energy supply of the electric drive resulting in a velocity change of the device. The carrying structures can be any of the above described embodiment of a carrying structure according to present invention. This also applies for the secondary operating element. Each secondary operating element may further comprise any of the already above described features. An interesting embodiment comprises at least two carrying structures which are positioned in a parallel configuration. The at least two carrying structures may be placed adjacent to each other and in parallel, such that persons lying on said carrying structures are lying next to each other. lt is conceivable that the device is configured such that at least two users can be positioned substantially adjacent to another wherein each user is carried by an individual carrying surface. The mutual distance between the center lines of two adjacent carrying structures is substantially equal to the mutual distance between the center lines of two adjacent rows of crop. A non-limiting example of such distance is for example in the range of 50 to 100 cm, in particular substantially 75 cm.

Preferably, the device comprises at least an equal number of secondary operating elements as carrying structure. This would preferably mean that each user of the device has access to at least one (personal) secondary operating element. It is in particular beneficial if each carrying structure is provided with a by foot operable secondary operating element. The carrying structure in this configuration may further comprise any of the already above described features.

In an embodiment with multiple carrying structures at least some of the secondary operating elements, and preferably all secondary operating elements, are connected in series.

In a preferred embodiment with multiple secondary operating elements, the secondary operating elements are connected in parallel. This has an advantage over connection in series, because also when one secondary element would (un)intentionally not be connected or be broken, the circuit still functions.

it is an advantage to connect all secondary operating elements (in series and/or in parallel), such that the operation of any secondary operating element results in the same effect. In this way it may not be traceable which secondary operating element changed the signal in the electrical circuit. This may be desired as this might result in a lower threshold for using the element by a person on the device, especially when the device is in use by multiple persons. At any time and for any reason a person can use the secondary operating element to temporarily pause and/or slow down the device to have more time to perform the activities, such as weeding, at the current location of the device. This inherent anonymous feature of the serial connection of the secondary operating element may lead to a lower threshold for a person to use the secondary operating element which consequently may leads to a better and more precise overall result. Whereas if the secondary operating element is not anonymous, a person using the device would be inclined to skip necessary actions at a location to keep up with the predetermined standard operating velocity of the device. However, it is also conceivable that it the device is configured such that it is directly traceable which secondary operating was activated. The invention also relates to an assembly of at least one primary control unit and at least one secondary operating element according to the present invention.

The assembly may be used as an add-on feature for an agricultural device according to the prior art. The at least one primary control unit may be connected to a control unit and/or an electric drive of the agricultural device. The at least one secondary operating element may be placed upon any advantageous location on the device at a distance from the primary control unit. This allows the secondary operating element to be operated separately and simultaneously. The assembly empowers users of the agricultural device provided with the assembly to control the velocity. A person may change the velocity temporarily to substantially zero, pause, the device anonymously.

The invention also relates to the use of a device according to the present invention in particular for agricultural purpose. Where in this document is referred to manual or manually, it is in particular meant that actions are to be performed using at least one hand. It should be noted that where in this document is referred to carrying structure and/or carrying and any conjugations thereof also support structure and/or supporting and any conjugations thereof are meant. The carrying structure can for example be referred to as a bed. Where in this document is referred to wheels, it is also possible that tracks are used.

The invention will be further elucidated by the following figures, wherein: Figure 1 shows a perspective view of a first possible embodiment of an agricultural device according to the present invention; Figure 2 shows a side view of a second possible embodiment of an agricultural device according to the present invention; Figure 3 shows a schematic top view of a third possible embodiment of an agricultural device according to the present invention; and Figure 4a shows a schematic view of an electric circuit according to the present invention including two secondary operating elements connected in series; and Figure 4b shows a schematic view of an electric circuit according to the present invention including two secondary operating elements connected in parallel; and Figures 5a-c show a schematic top view of three different embodiments of an adjustable mutual distance between a body part of a carrying structure and a secondary operating element. Figure 1 shows a perspective view on a first possible embodiment of the agricultural device 1 according to the present invention. The device comprises a mobile frame 2 which is in the shown embodiment connected with three wheels 3, 3’, in particular one front wheel 3 and two rear wheels 3’. The frame is provided with two carrying structures 4, which are each configured to carry at least one person in a substantially lying position. The device 1 further comprises an electric drive 5 configured to drive at least one wheel, a primary control unit (not shown) configured to at least control the actuation and/or energy supply of the electric drive 5 and at least one secondary operating element 6 which can be operated in at least an initial state and an activated state. At least one secondary operating element 6, and preferably all secondary operating elements 6, and the primary control unit are included in an electric circuit, wherein activation of at least one secondary operating element 6 into the activated state causes a circuit change of said electric circuit such that the primary control unit alters the energy supply of the electric drive 5 resulting in a velocity change of the device 1. The frame 2 of the device 1 comprises an upper part 2a and a lower part 2b.

The carrying structures 4 are connected to the upper part 2a of the frame with the middle of the carrying structure, such that around the shoulders of a person lying on the carrying structure

4 the person is not hindered by a part of the frame 2. The rear side of the carrying structures 4 can be connected to the upper part 2a and/or lower part 2b of the frame 2. The upper part 2a is provided with a roof structure 8. To move the device forward — without the need of charging indoors - in a direction A the device 1 is provided with a solar panel 9 on top of the roof structure 8 and an electric drive 5 to drive the front wheel 3. A battery pack provides the energy supply for the electric drive 5 and can be charged by power from the solar panel 9. The battery pack provides an energy buffer which can store energy for the use of the device for a couple of days.

To turn the device 1 on and off, the device 1 is provided with a primary control unit (not shown) in between the carrying structures 4. The primary control unit is configured to at least control the actuation and/or energy supply of the electric drive 5. When the device 1 is in use, the device 1 moves forward in a (linear) direction A and the persons lying in a face down configuration on the carrying structures 4 can use their hand(s) for, for example, weeding the field below.

When the device 1 is at a location with a concentration of more weeds, and thus more work for the person using the device 1, it improves the result if there is temporarily more time to work at that location.

Therefore, the device 1 is configured such that the person using the device 1 can temporarily pause the device 1 while continue working with their hands.

The person can pause or slow down the device

1 by activating, for example via pushing, a secondary operating element 6 with its foot.

In the shown embodiment, each carrying structure 4 is provided with one secondary operating element 6, which is mounted on the back of the carrying structure 4. The secondary operating element 6 is positioned centrally, such that it can be operated easily by both left and right foot of a person lying on the carrying structure 4. The secondary operating element 6 in this embodiment is a momentary switch 6 which is oriented such that a pressure is applied by a person’s foot in a direction substantially perpendicular to the direction of movement A of the agricultural device.

The length of the carrying structure 4 is optionally adjustable because the frame of the carrying structure 4 is extendable and slideable, such that the mutual distance between the distal end and thus the connected thereto secondary operating element 6 and the body part 4a of the carrying structure 4 is adjustable to a person’s dimensions. Figure 2 shows a side view of a second possible embodiment of an agricultural device 10 according to the present invention. The device 10 comprises a mobile frame 12 with three wheels 13, 13, in particular one front wheel 13 and two rear wheels 13’. The device 10 will mostly be used to move in the forward direction A. The device 10 as shown comprises two carrying structures 14, 14’, which are shown in a non-tilted position. The carrying structures 14,14’ are positioned substantially parallel and are shown at the same height compared to the frame. Each carrying structure 14, 14’is configured to carry a person in a substantially lying position. The front wheel 13 can be driven by the electric drive 15. To control the electric drive 15, the device 10 is provided with a primary control unit 17 which is configured to at least control the actuation and/or energy supply of the electric drive 15. The control unit 17 is positioned such that it is accessible for manual control by a person lying on any of the two carrying structures 14, 14’. In the present embodiment the control unit 17 is therefore situated in between the two adjacent carrying structures 14, 14’ and slightly lower than the plane wherein the carrying structures extend. Each carrying structure 14, 14’ is provided with one secondary operating element 16, which is mounted on the back of the carrying structure 14, 14’. Each secondary operating element 16 is operable between at least an initial state and an activated state, wherein activation of a secondary operating element 16 from its initial state to the activated state can be done by a preferred foot of a person lying on the carrying structure 14, 14’.

Figure 3 shows a schematic top view of a third possible embodiment of an agricultural device 20 according to the present invention in a possible way of use. The device 20 comprises a mobile frame 22 with a front wheel 23 and two rear wheels 23’. The frame 22 is connected with two carrying structures 24, 24’. Each carrying structure 24, 24’ is provided with one pair of secondary operating elements 26a, 26b. The secondary operating elements 26, 26" are mounted on the frame 22 such that they are operable by a user's foot. The secondary operating elements 26, 26’are positioned such that the left secondary operating element 16 of each pair 26a, 26b are configured to be operated by a person's left foot and the right secondary operating elements 26’of each pair 26a, 26b are configured to be operated by a person’s right foot. A person lying on a carrying structure 24, 24’ may operate any of the corresponding secondary operating elements 26, 26°, to operate the secondary operating element from an initial state to an activated state, or vice versa. The embodiment comprises two pairs of secondary operating elements 26a, 26b, which are connected in series. This results in that activation of at least one of the secondary operating elements 26, 26’ into the activated state will have the same effect. lf one of the secondary operating elements 26,26’ is in the activated state the primary control unit 27 receives a signal. When this signal is received the primary control unit 27 changes the actuation of the electric drive 25 such that the movement of the device 20 is slowed down or paused. The primary control unit 27 can also receive inputs such as an emergency stop, and an on/off input. The primary control unit 27 is placed on the opposite distal end of the carrying structures 24, 24’ such that it is accessible and visible for the person lying on the carrying structure 24, 24’ while using the device 20.

The device 20 is typically used to displace a person lying on a carrying structure 24, 24'over crop rows. The centrelines of the crop rows are indicated with dashed lines 28, 28’. The crop rows are spaced apart over a length D. The shown schematic top view is a view wherein the frame 22 is in a compact state, when crop rows are spaced at a length D of substantially 75 cm. The carrying structures 24, 24’are spaced apart such that in use the carrying structure 24, 24’ is moved along and above the crop row. The two rear wheels 23'are spaced apart over a mutual distance C. Distance C depends on the width of the crop rows as well and in the shown embodiment the rear wheels 23’ have a mutual distance of 150 cm, corresponding to the pitch of the crop rows. This is a compact state which is also suitable for trailed transport of the device 20. When crop rows are arranged in another configuration, the back of the frame 22 can be extendible such that the mutual distance C between the two rear wheels 23’ can increase up to substantially 300 or substantially 315cm or more if needed.

Figure 4a shows a schematic view of an example of an electric circuit 40 which can be applied in a device according to the present invention, for example a device as shown in the previous figures. The electric circuit 40 includes two secondary operating elements 36, 36’ and one primary control unit 37. The operating elements 36, 36’are connected in series such wherein the electrical circuit is initially closed.

In the figure both secondary operating elements 36, 66 are in the initial state, wherein the electric circuit 40 is not interrupted. The primary control unit 37 comprises a controller 39 which is configured to receive a 5V+ DC signal 39’or a OV signal 39”. Activation of at least one secondary operating element 36, 36’into the activated state causes a circuit change, namely an interrupted circuit and thus the controller 39 receives a signal 39” of OV. The controller 39 within the primary control unit 37 receives the signal and upon receiving a OV signal, it starts a software program which is configured to -for example- reduce or interrupt the energy supply of the electric drive. In combination with the resistance of the ground on the wheels, this typically results in a velocity decrease of the device, usually of substantially O km/h. When both secondary operating elements 36, 36’are in the initial state (as shown) the controller 39 receives a 5V+DC signal and the control unit 37 is configured to accelerate to or maintain the standard operating velocity of the device according to the present invention.

Figure 4b shows a schematic view of an example of an electric circuit 41 which can be applied in a device according to the present invention, for example a device as shown in the previous figures. In this embodiment the secondary operating elements are connected in parallel, instead of in series as shown in figure 4a, wherein the electrical circuit is initially open, such that the initial state causes a OV signal and the activated state causes a 5V+DC signal. The electric circuit 41 includes two secondary operating elements 36, 36" and one primary control unit 37. In the figure both secondary operating elements 36, 66’ are in the initial state, wherein the electric circuit 40 is interrupted. The primary control unit 37 comprises a controller 39 which is configured to receive a 5V+ DC signal 39’or a OV signal 39”. Activation of at least one secondary operating element 36, 36’ into the activated state causes a circuit change, namely a closed circuit and thus the controller 39 receives a signal 39” of 5V+DC. The controller 39 within the primary control unit 37 receives the signal and upon receiving the 5V+DC signal, it starts a software program which is configured to -for example- reduce or interrupt the energy supply of the electric drive. In combination with the resistance of the ground on the wheels, this typically results in a velocity decrease of the device, usually of substantially 0 km/h. When both secondary operating elements 36, 36’are in the initial state (as shown) the controller 39 receives a OV signal and the control unit 37 is configured to accelerate to or maintain the standard operating velocity of the device according to the present invention.

Figure 5 shows a schematic view of three embodiments of a device according to the present invention with a displaceable secondary operating element.

The figures show a detailed top view of a rear part of a carrying structure 54, a secondary operating element 56 and part of a frame 52. Figure 5a shows a carrying structure 54 wherein the secondary operating element 56 is connected with the distal end of the carrying structure 54. The carrying structure 54 is in length adjustable such that the mutual distance between the body part 54a and the operating element 56 is adjustable.

Figure 5b shows a secondary operating element 56 which is connected to the frame 52. The carrying structure 54 itself is displaceable towards and from the frame 52, such that the mutual distance between the body part 54a of the carrying structure 54 and the secondary operating element 56 decreases or increases.

Figure 5c shows a displaceable secondary operating element 56, which is connected to the distal end of the carrying structure 54. The dashed lines indicate a possible position of the displaced secondary operating element 56 (schematically shown with dashed square) with a shorter mutual distance between the secondary operating element 56 and the body part 54a of the carrying structure 54. It is also possible that the displaceable secondary operating element 56 is mechanically connected to the frame 52. It will be clear that the invention is not limited to the exemplary embodiments which are illustrated and described here, but that countless variants are possible within the framework of the attached claims, which will be obvious to the person skilled in the art.

In this case, it is conceivable for different inventive concepts and/or technical measures of the above-described variant embodiments to be completely or partly combined without departing from the inventive idea described in the attached claims.

The verb 'comprise' and its conjugations as used in this patent document are understood to mean not only ‘comprise’, but to also include the expressions ‘contain’, ‘substantially contain’, formed by’ and conjugations thereof.

Claims

Conclusions

1. Agricultural device, comprising: - at least one mobile frame with at least two wheels; - at least one support structure adapted to support at least one person, preferably in a mainly lying position; — at least one electric drive adapted to drive at least one wheel; - at least one primary control unit arranged for at least controlling the control and/or energy supply of the electric drive; and — at least one secondary control element operable in at least an initial state and an activated state; wherein at least one secondary control element and at least one primary control unit are included in at least one electrical circuit, wherein activation of at least one secondary control element in the activated state causes a circuit change of said electrical circuit such that the primary control unit cuts off the energy supply of the electric drive changes, resulting in a speed change of the device.

The device of claim 1, wherein activation of at least one secondary control element causes a circuit change of said electrical circuit such that the primary control unit reduces the power supply to the electrical drive, resulting in a reduction in speed of the device.

3. Device according to one of the preceding claims, wherein activation of at least one secondary control element causes a circuit change of said electric circuit such that the primary control unit at least temporarily interrupts the energy supply of the electric drive, resulting in a reduction in speed of the device, for example for pausing the device.

A device according to any one of the preceding claims, wherein activation of at least one secondary operating element causes either a connection or an interruption of said electrical circuit such that the primary control unit changes the power supply of the electrical drive.

5. Device as claimed in any of the foregoing claims, wherein at least one secondary operating element comprises at least one switch, in particular at least one pulse pressure switch.

6. Device as claimed in any of the foregoing claims, wherein the electrical circuit is a signal circuit, in particular a DC signal circuit.

An apparatus according to any one of the preceding claims, wherein the primary control unit comprises at least one timer, activation of at least one secondary control element triggering said timer for a predetermined period of time to change the power supply of the electric drive, resulting in a change in speed. of the device.

8. Device as claimed in any of the foregoing claims, wherein the secondary operating element comprises at least one mechanical timer.

9. Device as claimed in any of the foregoing claims, wherein the device is at least movable in at least one linear direction of travel, in particular a linear forward direction of travel and/or a linear backward direction of travel, and wherein the primary control unit is adapted to control the direction of travel of the device.

10. Device as claimed in any of the foregoing claims, wherein at least one support structure extends substantially in a linear direction of travel of the device.

The device of any preceding claim, wherein at least one is positioned at or near a distal end of the support structure such that a person positioned on said support structure can operate said secondary control element with at least one foot.

12. Device as claimed in claim 11, wherein the support structure is a body part! and wherein at least a portion of the distal end of the support structure is extendable relative to said body portion of the support structure.

13. Device as claimed in any of the foregoing claims, wherein at least one secondary operating element comprises at least one pedal, in particular a foot pedal.

14. Device as claimed in any of the foregoing claims, comprising at least one visual indicator adapted to provide a visual indication in the event that at least one secondary operating element has been activated.

15. Device as claimed in any of the foregoing claims, wherein the position and/or angle of at least one support structure relative to the frame is adjustable.

16. Device as claimed in any of the foregoing claims, wherein the length over which the at least one support structure extends is adjustable.

17. Device as claimed in any of the foregoing claims, wherein the secondary operating element is connected to the frame and wherein the mutual distance between the secondary operating element and the support structure is adjustable.

A device according to any one of the preceding claims, wherein the device is an autonomous device.

19. Device as claimed in any of the foregoing claims, wherein the primary control unit comprises at least one primary operating element, adapted to manually control the energy supply of the electric drive.

20. Device as claimed in any of the foregoing claims, wherein the frame defines at least one receiving space for receiving at least one solar panel.

21. Device as claimed in any of the foregoing claims, comprising at least one solar panel, wherein at least one solar panel is positioned at least partly above at least one support structure.

A device according to any one of the preceding claims, wherein the frame comprises at least three wheels, in particular positioned such that at least one front wheel is positioned in a front region of the frame and wherein at least one pair of rear wheels is positioned in a rear region of the frame.

The device of claim 22, wherein the distance between at least one pair of rear wheels is adjustable.

24. Device as claimed in any of the foregoing claims, comprising at least one mechanical brake.

25. Device as claimed in any of the foregoing claims, wherein the electric drive comprises at least one electric motor.

26. Device according to one of the preceding claims, comprising several support structures, each support structure being arranged to support at least one person, preferably in a substantially lying position, and the device comprising several secondary operating elements, each secondary operating element and at least one primary control unit are included in at least one electrical circuit, where activation of at least one secondary control element causes a circuit change of said electrical circuit, such that the primary control unit changes the energy supply of the electric drive, resulting in a speed change of the device.

The device of claim 26, wherein at least some of the secondary operating elements, and preferably all secondary operating elements, are connected in series.

28. Device according to claim 27, wherein at least some of the secondary operating elements, preferably all secondary operating elements, are connected in parallel.

29. Assembly of at least one primary control unit and at least one secondary operating element according to one of the preceding claims.

Use of a device according to any one of claims 1-28 for agricultural purposes, for example for weeding or harvesting.