WO2013007329A1

WO2013007329A1 - Remote control with 360° user protection

Info

Publication number: WO2013007329A1
Application number: PCT/EP2012/002229
Authority: WO
Inventors: Michael Steffen
Original assignee: Wacker Neuson Produktion GmbH & Co. KG
Priority date: 2011-07-11
Filing date: 2012-05-24
Publication date: 2013-01-17
Also published as: DE202011110667U1; EP2732103A1; DE102011107091A1

Abstract

A remote control (1) for a self-propelled implement (3), for example for a tamping machine, a vibrating plate or a roller for ground compression, has a first transmission apparatus (4) for sending an electromagnetic control signal in an operating direction (WR). In addition, a second transmission apparatus (4, 6) for sending an electromagnetic safety signal in a safety area (S1, S2) is provided. An operating state of the implement (3) can be prescribed on the basis of the safety signal. By way of example, operating activities of the implement (3) can be prevented when the safety signal can be received. The safety area (S1, S2) comprises a rear area (S2) which is opposite the operating direction (WR). This makes it possible to achieve protection for a user (2) of the remote control (1) in the rear area (S2) situated behind the user (2), for example.

Description

REMOTE CONTROL WITH ROUND - OPERATOR PROTECTION

description

The invention relates to a remote control for a self-propelled implement according to the preamble of claim 1. The invention can be used for example for tools for soil compaction such as rammers, vibratory plates or rollers.

Self-propelled soil compaction machines typically have a high mass that is set in motion by driving and / or working movements during operation of the machine. Such soil compaction machines can therefore pose a danger to an operator.

For the operation of such machines safety requirements exist, which are standardized, for example, in EN 500-4. According to these safety specifications, ground compaction machines are to be controlled remotely, for example by means of infrared radiation from a safe distance. Furthermore, a shutdown of all operating conditions should be provided if they represent a danger to the operator located in the vicinity of the implement.

By controlling the implement by means of infrared signals it is ensured that there is always a line of sight between the implement and the operator during the operation of the work tool. If the line of sight is disturbed, the infrared signals are not receivable by the implement, so that the implement is not controlled by the remote control. In this case, all operating activities which may pose a danger to the environment of the implement may be suspended and / or terminated. Only when the infrared connection is restored can the operation of the implement be resumed.

Because of the high transmission power of such infrared remote controls, it is known, for example from EP 1 374 199 B1, to feed these by means of a cable from an external energy source.

Furthermore, it is known from EP 1 025 556 B1 that the infrared signal of the remote control also transmits information about a distance between the operator and the implement. If the distance between the operator and the workstation is less than a predetermined value, all the operators prevent hazardous operations until the proper safety distance is restored.

It is furthermore known from EP 0 577 095 B1 to emit a near-field signal from the remote control, which can be transmitted, for example, by means of weak infrared radiation, which can only be received in an immediate, close environment of the operator. When the near field signal is received, all operating activities of the implement that may endanger the operator are also interrupted or suspended.

Dangers to the operator, such as driving over, pinching or crushing, should be reliably prevented by these measures.

In the known embodiments of the remote control, however, it is possible that the control signal of the remote control on the implement is receivable, although there is no visual contact with the implement. For example, the control signal can be directed to the implement by reflection at an adjacent reflection surface while the operator turns away from the implement. In such a case, it is possible with the known remote controls to control the work equipment, although there is no visual contact with the implement.

Furthermore, it is possible in the example mentioned that the near field signal is not receivable on the implement, although the operator is in the immediate vicinity of the implement. For example, the near field signal may be shadowed by the operator facing away from the workstation or by a housing of the remote control in such a way that it can not be received by the implement. In this case, an existing work operation of the implement is not interrupted and the machine can continue to be controlled, although the implement and operator are in close proximity to each other and there may be a concrete threat to the operator by the implement.

The invention has for its object to provide a remote control for a self-propelled implement, which guarantees increased safety of the operator during operation of the implement.

This object is achieved by a remote control for a self-propelled implement according to claim 1 and by a method for remotely controlling a self-propelled implement according to claim 1 2. Further developments can be found in the dependent claims. A remote control for a self-propelled implement, in particular for a soil compacting device such as a rammer, a vibrating plate or a roller, has a first transmitting device for transmitting an electromagnetic control signal in a direction of action.

The control signal may transmit control commands for operation of the implement, such as commands to start or stop a motor and / or to start, accelerate, decelerate or stop the implement, as well as commands related to the working movements, such as pitching, vibrating (driving a vibrator ) or rolling. Furthermore, the control signal additional information can be removed, such as removal of the remote control from the implement. A transmission of release or life signals of the operator, for example in the sense of a "dead man function", by means of the control signal is possible.

The control signal can be transmitted, for example, by infrared radiation. This ensures that there is visual contact during transmission of control signals between the first transmitting device of the remote control and a receiving device of the working device.

The effective direction of the control signal can be determined by an effective range of the first transmitting device and, for example, correspond to a direction in which the control signal can be transmitted and from which it can be received. It may be determined by an arrangement of the first transmitting device on the remote control. For example, the effective direction can be determined by an optical center of the first transmitting device. In the case of transmission of the control signal by means of infrared radiation, the effective range may comprise an angular range of, for example, ± 30 ° about the optical center.

Furthermore, the remote control has a second transmitting device for transmitting an electromagnetic security signal in a security area. Also, the security signal can be transmitted for example by infrared radiation. It can be sendable in such a way that it can only be received in the security area or in such a way that a spatial position of the security area can be determined from the reception of the security signal. Furthermore, by the safety signal to a safety area, for example, complementary work area be characterized in the driving and working activities without danger to the operator are executable. For example, from a reception intensity of the security signal and / or from further parameters when receiving the security signal at the receiving device of the implement a distance to the second transmitting device of the remote control can be determined. Thus, a short range surrounding the remote control or the second transmitting device can be marked with a predetermined spatial maximum distance to the remote control.

The security signal can also be sendable in such a way that predetermined angle ranges around the remote control are identified by the security signal as a security area.

An operating state of the working device can be predetermined as a function of the safety signal, that is to say can be defined or defined. For example, the operating state can be predefinable as a function of the reception of the security signal and / or as a function of a relative spatial position of the implement to the security area. The operating state can thus be dependent on whether the implement is in the security area, in the work area and / or in the vicinity.

To specify the operating state, it is possible by means of the control signal ü to release transmitted commands as a function of the safety signal for the working device, that is to execute on the implement, or to suppress the same, that is to prevent execution by the implement. In this way, for example, control of the implement by the remote control in response to the security signal can be prevented.

For example, commands to a drive or a steering of the implement can only be executed if it can be concluded from the safety signal and / or its receivability at a safe distance of the implement to the second transmitter unit of the remote control and thus to the operator, or if from the To close the safety signal is that the implement is in the work area. In addition, it is possible to actively influence the operating state of the working device by executing predetermined safety commands. For example, depending on the security signal, z. B. upon detection of an entry into the security area, given security commands, such as Stopping the engine or for braking a propulsion, are carried out, thereby to transfer the implement in a safe operating condition.

The operating state of the implement can be specified on the basis of the reception of the safety signal on the implement. For example, the operation of the implement may be interruptible when the safety signal is receivable on the implement. Alternatively, the operation of the implement may be interruptible if the safety signal on the implement is not receivable. In the case of the remote control according to the invention, the safety area in which the safety signal can be transmitted comprises a reverse area opposite the effective direction of the control signal.

In an exemplary arrangement, the first transmitting device may for example be arranged frontally on a front side of the remote control, which faces away from the operator during a regular operating action. In this exemplary arrangement, the security area in which the security signal is emitted comprises an area located behind the transmitter, which corresponds to the rear area. In the exemplary arrangement, the rear area may also include an area located behind the operator located in the regular operating position.

In one embodiment, the security area also includes a side area laterally located with respect to an orientation of the remote control when used as intended. By emitting the security signal in this area, the space can be marked laterally by the operator, so that the operator can be protected, for example, from lateral contact with the implement. Alternatively or additionally, it is possible to mark a sub-area located above and / or below with respect to an orientation of the remote control when used as intended in the effective direction by the safety signal. In this way it can be ensured that the operator is also protected during body movements during operation of the working device from damaging contact with the implement. This allows improved protection, for example, when bending, but also after a fall of the operator.

In an embodiment, the safety signal has a shorter range than the control signal. In this embodiment, the security area corresponds to the near area and can on the implement, for example, by evaluation the reception and / or the reception intensity of the security signal are detected at the receiving device.

In one embodiment, the second transmitting device has a first and a second transmitting unit for emitting the security signal. By way of example, the first and the second transmitting unit can have devices for emitting the security signal, such as, for example, light-emitting diodes, infrared diodes or antennas. The second transmitting unit may be arranged in this embodiment in an area in which a radiation of the first transmitting unit is shadowed for example by a housing of the remote control or by the position in a regular operating position operator. In other words, the second transmitting unit can be arranged in the region of a shadow cast of the first transmitting unit, which can result from the fact that the security signal radiated by the first transmitting unit is stopped by physical objects, for example the housing of the remote control or the body of the operator , By arranging the second transmitting unit in the area of the shadow, the area irradiated with the security signal by the second transmitting unit can be additionally secured; A "blind spot", in which the security signal is not receivable, is avoided.Thus, an increased security of the operator can be ensured by, for example, a close behind the operator lying area is secured.Further, by arranging other transmission units in the shadow of the An additional increase in security is achieved for the first and second transmission units, which enables effective all-round operator protection, since the security signal can be transmitted in an entire environment surrounding the operator with an ambient angle of 360 °.

In one embodiment, at least one transmitting unit of the second transmitting device may be disposed on a carrying device for carrying the remote control by the operator. The carrying device can facilitate the carrying of the remote control by the operator in the current working operation and at the same time ensure the safety of the operator by emitting the safety signal.

For example, the carrying device may have a Nackengu rt, a Beckengu rt and / or a shoulder wear, on which / which the transmitting unit is arranged. The transmitting unit can be arranged in a neck pad, pelvic pad and / or shoulder pad. An arrangement on a fixed support frame is possible. In a variant, the carrying device can be mechanically and / or electrically coupled to the remote control by a coupling device. In addition, a signal line can be provided, with which a transmission request of the remote control can be transmitted to the second transmitting device, which can also be connected to the remote control during coupling. The coupling device may be designed, for example, as a plug or clamp connection, in order to enable simple mechanical and electrical coupling.

If such a coupling device is provided, the transmission of the control signal by the first transmitting device can be inhibited if the coupling device is not or is incorrectly connected to the remote control. In this case, operation of the remote control and the working device without the security of the operator ensuring second transmitting device is not possible.

In a further variant, at least one of the transmission units of the second transmission device can be arranged on a head protection for the operator. For example, an arrangement on a helmet, ear protection or eye protection is possible. By arranging the first and second and possibly further transmitting units along a horizontal circumference of the helmet, for example, the all-round operator protection can be achieved without shaded areas and without "blind spots." The arrangement of transmitting units, for example, on an ear holder of the hearing or eye protection allows one lateral protection of the operator.

In a further embodiment, a further security signal from the second transmitting device can be send, which has a greater or alternatively a smaller range than the security signal. In this embodiment, the operating state of the working device may additionally be predeterminable as a function of the further safety signal. This makes it possible to mark a further security area or the work area in addition to the security area. The further safety area or the working area can be determined by a predetermined ambient angle around the remote control, for example, starting from the effective direction. In a variant of the embodiment, the further safety signal has a greater range than the safety signal and identifies the working area. In this embodiment, commands received via the control signal from the receiving device of the implement can be enabled by the further security signal. The commands are only implemented if the further security signal can be received. The security signal can secure the - also backward - near range in this embodiment.

In a further variant of this embodiment, the further safety signal has a shorter range than the safety signal and identifies the further safety range in which, for example, the proximity range and effective range can overlap. The security signal can be pronounced in this variant as an interference signal, which interferes with the reception of a reflected control signal and thereby also secures the back area.

In a further embodiment, the control signal can be transmitted as an infrared signal or radio signal, while the security signal and / or the further security signal are transmitted as infrared signals or as ultrasonic signals.

A transmission of the control signal as an infrared signal ensures that the control commands sent by the remote control to the implement are only receivable on the implement when there is visual contact between the remote control and the implement. By contrast, transmitting the control signal as a radio signal enables fast and efficient transmission of the control signals with good reception, low susceptibility to interference and high data volume.

Since the radio signal can also be transmitted without visual contact, in this embodiment the visual contact can be checked by checking the reception of the additional safety signal, which can be transmitted, for example, as an infrared signal. In this embodiment, the further safety signal can characterize the working and / or effective range, while the safety signal secures the near range encompassing the rear region. The radio signal can be transmitted, for example, with a channel identifier to avoid disturbances of the working operation, for example, by further, used in the receiving area of the implement remote controls. By using an example on the remote control and on the implement vorge- or by the operator selectable channel identification signals of other remote controls can be detected as interference signals and ignored, for example.

Accordingly, the security signal and / or the further security signal can also be provided or transmitted with a predetermined or selectable channel identifier. This makes it possible to differentiate the security range of the own remote control from that of other remote controls used in the environment. Concerning the control of several work tools with several remote controls in a small space, it is necessary to check whether it is necessary to differentiate the safety ranges of the several remote controls or to interrupt the operation of each work equipment in each safety area for safety reasons.

The safety signal and / or the further safety signal can also be ultrasound signals. Since ultrasound is transmitted via vibrations of the air particles, a shadowing of the safety signal by the operator or other objects located in the vicinity of the operator is mitigated, which can improve a reception of the safety signal in the environment of the operator. In a further embodiment, the security signal or the further security signal may be an interference signal for disturbing the reception of the control signal in the security area. For example, by transmitting the interference signal in the rear region, the reception of a reflected control signal by the working device can be prevented. As a result, an operation of the working device can be prevented, for example, when the operator turns away with the remote control from the implement, the control signal, however, is receivable by reflection on a reflection surface opposite the operator on the implement. The interference signal can be designed such that the control signal is not or only incorrectly receivable.

A method of remotely controlling a self-propelled implement includes transmitting the electromagnetic control signal in the direction of action by the first transmitting device. Furthermore, the method comprises transmitting the electromagnetic security signal in the security area by the second transmitting device, wherein the security area comprises the rear area opposite the effective direction. Depending on the safety signal, the operating status of the implement is specified. These and further features of the invention are explained in more detail below by means of examples with the aid of the accompanying figures. Show it:

Fig. 1 shows schematically a remote control for a self-propelled Arbeit- workgerät with radiation of a security signal in one

Security area, which comprises a rear area opposite to a direction of action of the remote control, in a plan view; FIG. 2 schematically shows an embodiment in which the security area comprises a top area, a bottom area and a side area of the remote control, in a front view; FIG. 3 shows schematically an embodiment with transmitting units for transmitting the security signal in the side area in a plan view;

Fig. 4 shows schematically an embodiment with a on a

Construction helmet of the operator arranged transmitting device in a supervision;

5 schematically shows an exemplary embodiment with a transmitter unit arranged on a neck strap of the operator in a rear view;

6 schematically shows an exemplary embodiment with a transmitter unit arranged on a lap belt of the operator in a rear view;

Fig. 7 shows schematically an embodiment with two at one

Schultertrage the operator arranged transmitting units in a plan; Fig. 8 schematically shows the embodiment of FIG. 7 in a

Rear view; FIG. 9 schematically shows an exemplary embodiment with transmitting units arranged on the construction helmet and on a hearing protection in a front view; FIG.

Fig. 10 shows schematically the embodiment of Fig. 1, wherein a

Control signal is a radio signal; and

Fig. 1 1 schematically shows the embodiment of FIG. 1, wherein an infrared control signal from a reflection surface is reflected and thus receivable for an operating device located behind the operator.

1 shows a plan view of a remote control 1 with which an operator 2 can control a self-propelled working device 3 in front of him. The remote control 1 has a forward transmitting unit 4, with which in a direction of action WR a control signal to a receiving unit 5 of the working device 3 can be sent. In the example, the control signal is an infrared signal which can be received by the receiving unit 5 of the working device 3 in an effective range WB located around an optical center or about an optical axis of the transmitting unit 4.

With the help of the control signal control commands can be transmitted to the implement 3, the driving and steering movements, working movements and other operations of the implement, such as a start or stop a drive can cause. Furthermore, other information, such as, for example, clearances of previously sent operating commands, information relating to a position of the remote control relative to the implement or information on a state of the operator ("deadman button"), can also be transmitted from the forward transmitting unit 4 in a first In the example, it is clear from the short range of the first security area, starting from the forward transmitting unit 4, that the first security signal is designed as a signal with a short range, for example a weak infrared signal act, which is receivable only in the first security area S l.

An evaluation logic may be provided on the implement 3, which upon receipt of the first safety signal by the receiving unit 5, all operating activities, which could pose a hazard to the operator. For example, driving movements, steering movements or working movements of the working device 3 can be prevented, or a drive can be stopped and / or a warning signal can be emitted. Thus, the operator 2 can be protected from hazards that can emanate from the implement 3, if this is in the first security area.

Furthermore, a rear-facing transmission unit 6 is provided, with which a second security signal in a second security area S2 can be sent. The second security area S2 comprises a rear area of the remote control 1 and of the operator 2, which is situated in a direction opposite to the direction of action WR return RR. In the example shown, the second security area S2 corresponds to the rear area. In the example, the second safety signal is also assumed to be a weak infrared signal which, in accordance with the mode of action described above, secures the rear area located behind the remote control and the operator in such a way that protection of the operator 2 against operating activities of the working device 3 in the second safety area S2 is ensured.

Fig. 2 shows the remote control 1 and the operator 2 in a frontal view. On the remote control 1 in addition to the forward transmitting unit 4, a first sideways transmitting unit 7, a second sideways transmitting unit 8, an upward transmitting unit 9 and a downward transmitting unit 10 are provided, from which a weak infrared security signal with a short range sent out can be.

With the help of the transmitting units 7, 8, 9 and 10 can be protected in relation to an Au direction of the remote control 1 during normal use in the direction of action laterally located side region S3, S4, in the direction of action above located upper region S5 and in the direction of action below sub-area S6 in that the operator is safely protected from physical damage by the implement 3 located or entering one of the areas S3 to S6.

For example, protection of the operator by the security signal transmitted by the first and second lateral transmitting units is necessary when the operator turns sideways during operation of the machine. A protection of the operator 2 by the upward and downward sending unit. 9 and 10 is necessary, for example, when the operator is leaning forward or falling during operation of the implement.

FIG. 3 shows an arrangement of a left-hand protruding transmitting unit 11 and a right-hand protruding transmitting unit 12 on the remote control 1. As a result of the arrangement shown, the security signal can be transmitted in a surrounding security area S encompassing the rear area.

Due to the exposed spatial position of the left and right side outstanding transmitting units 1 1 and 1 2, a radiation of the security signal in the side areas S3, S4 shown in Fig. 2 is favored. Furthermore, in a surrounding area of the operator 2, in which the security signal transmitted by one of the laterally projecting transmitting units 1 1, 12 is shadowed, for example, by the operator 2 or a housing of the remote control 1, that of the respective other laterally projecting transmitting unit 12, 1 1 transmitted security signal be receivable. Thus, an all-round security of the operator 2 in the surrounding security area S can be ensured.

4 shows an alternative or additional arrangement of a helmet transmitting unit 13 on a construction helmet 14 of the operator 2 of the remote control 1. Due to the exposed position of the helmet sending unit 13, a shadow cast by the operator is largely avoided, and the security area S surrounding the operator 2 can be effectively secured by the security signal. Fig. 5 shows the operator 2 of the remote control 1 in a rear view. In the example, the rearward transmission unit 6 is arranged on a neck strap 1 5 or an associated neck pad. The neck strap 15 is part of a carrying device of the remote control 1, and finds great support in the support of the operator 2. Due to the rearward arrangement of the rear-facing transmission unit 6 in the neck region, illumination or emission of the safety signal in the rear region and thus securing of the second safety region S2 shown in FIG. 1 are possible.

FIG. 6 shows a further possibility for arranging the rear-facing transmission unit 6 on a lap belt 16 of the operator 2 of the remote control 1. The lap belt 16 may also be part of the carrying device and support the operator when holding the remote control 1. The rearward alignment makes it possible to transmit the security signal in the second security area S2 comprising the rear area. 7 shows a plan view of an arrangement of two transmission units 6 a, 6 b directed backwards on a shoulder support 1 7 of the operator 2 of the remote control 1. As a result of the arrangement, the second security area S2 encompassing the rear area can be effectively secured by the security signal since a shadow of the emission of one of the two rear-facing transmission units 6a, 6b can be illuminated by the emission of the respective other transmission unit 6b, 6a. In addition, it is ensured by wearing the shoulder strap 1 7 on both shoulders of the operator 2 that a lateral slipping or twisting of the shoulder strap 1 7 and thus the first and second rearward transmitting units 6a and 6b is largely avoided.

Furthermore, the exemplary embodiment has two coupling devices 18a and 18b with which the remote control 1 can be mechanically and electrically coupled to the shoulder carrier 17. The coupling devices 18a and 18b can be designed, for example, as a plug connection or as a hook connection with a separate electrical terminal. By the electrical connection, the backward transmission units 6a and 6b can be powered by the remote control 1 with power. Furthermore, additional information regarding the transmitted safety signal can be transmitted.

The coupling achieved by the coupling devices 18a, 18b can be connected to an evaluation logic of the remote control 1, by which the operation of the working device 3 is interrupted in the event of failure of one or both of the coupled rearward transmitting units 6a, 6b and / or a warning to the operator is issued.

Fig. 8 shows the embodiment of Fig. 7 in a rear view. FIG. 9 shows a further exemplary embodiment, in which further transmitting units 19, 20, 2 1, 22 are arranged laterally on the construction helmet 1 4 of the operator 2 or on an ear protection 18. Alternatively, the further transmitting units 19, 20, 2 1, 22 may also be provided on straps of an eye protector 23. Due to the lateral or rearward orientation of the further transmitting units 19, 20, 21, 22, effective illumination of the second security area S2 shown in FIG. 1 and comprising the rear area and of the side area S3, S4 shown in FIG. 2 becomes possible. 10 shows a plan view of a further embodiment in which a radio control signal 24 transmits control commands to the implement 3. The radio control signal 24 can be transmitted, for example, from the forward-looking transmitting unit 4 or from a further transmitting unit (not shown), for example an antenna.

Furthermore, as already described with reference to FIG. 1, the security signal is transmitted as an infrared signal from the forward transmitting unit 4 and the rearward transmitting unit 6 in the first and second security areas S 1, S 2.

In addition, the forward transmitting unit 4 sends another security signal with a greater range, which can be transmitted for example by infrared radiation. In the example shown, the further safety signal can be received by the receiving unit 5 of the working device 3 in the effective range WB. For example, a release of the radio signals or commands transmitted via the radio control signal 24 can be transmitted by the further safety signal.

By the transmission of the further safety signal via infrared is ensured that the release of the control commands can only be received on the implement 3, when there is visual contact between the forward transmitting unit 4 of the remote control 1 and the receiving unit 5 of the working device 3. The embodiment combines the effective and less susceptible to interference data transmission of control commands by the radio control signal 24 with a hedge of the first and second security area S l, S2 and the visual contact in the effective range WB respectively by infrared signals. In Fig. 1 1, an operating situation is shown in which the operator 2 has turned away with the remote control 1 from the implement 3. The first and second security areas S 1 and S 2 are formed by transmitting the security signal by the remote control 1 as described in FIG. 1 relative to the orientation of the remote control 1. Furthermore, an infrared control signal is transmitted by the forward transmitting unit 4 in the effective range, which is reflected by a reflection surface 25, which may be formed for example by a glass, such that it is receivable on the receiving unit 5 of the working device 3 located behind the operator. Due to the reflection of the control signal, the implement 3 in the case shown, the control commands of the remote control receive and thus carry out normal operating activities. The illustrated entry of the working device 3 in the second security area S2 located behind the operator 2, however, reliably prevents operating activities which could endanger the operator 2. As a result, an all-round security of the operator can be ensured even in the illustrated operating situation.

Claims

claims

1 . Remote control (1) for a self-propelled implement (3), with

a first transmitting device (4) for transmitting an electromagnetic control signal in a direction of action (WR), and

a second transmitting device (4, 6) for transmitting an electromagnetic safety signal in a safety area (S l, S2);

wherein an operating state of the working device (3) in dependence on the safety signal can be predetermined, and

wherein the security area (S l, S2) comprises a rear area opposite the direction of action (WR).

2. Remote control according to one of the preceding claims, wherein the safety signal has a shorter range than the control signal.

3. Remote control according to one of the preceding claims, wherein the security area (S 1, S 2) has a top area (S 5) located laterally in relation to an orientation of the remote control when used as intended in the effective direction, or below sub-area (S6).

4. Remote control according to one of the preceding claims, wherein

the second transmitting device (4, 6) has a first and a second transmitting unit (1 1, 1 2) for emitting the security signal, and wherein

the second transmitting unit (12) is arranged in a region of a shadow that can be generated by a housing of the remote control (1) or by an operator (2) located in a regular operating position.

5. Remote control according to one of the preceding claims, wherein at least one transmitting unit (6) of the second transmitting device to a support device (1 5, 1 6, 17) is arranged for carrying the remote control by the operator.

6. Remote control according to claim 5, wherein the carrying device (1 7) has a Kopplu ngsvorrichtung (18 a, 18 b) for coupling with the remote control (1), and wherein the transmitting unit (6 a, 6 b) of the second transmitting device by the coupling device (18 a, 18b) is electrically coupled to the remote control (1).

7. Remote control according to claim 5 or 6, wherein the carrying device (15, 1 6, 1 7) has a neck strap (15), a lap belt (16) and / or a shoulder support (17) on which / which the transmitting unit (6a , 6b) is arranged.

8. Remote control according to one of the preceding claims, wherein at least one transmitting unit (19, 20, 2 1, 22) of the second transmitting device to a head guard (14, 18, 23) can be arranged for the operator.

9. Remote control according to one of the preceding claims, wherein a further security signal from the second transmitting device (4, 6) is sendable, and wherein the further security signal has a greater or lesser range than the security signal.

10. A remote control according to any one of the preceding claims, wherein the control signal is an infrared signal or a radio signal (24), and wherein the security signal and / or the further security signal is an infrared signal or an ultrasonic signal.

1 1. Remote control according to one of the preceding claims, wherein the security signal or the further security signal is an interference signal for disturbing the receivability of the control signal in a predetermined spatial area (S2).

12. Remote control according to one of the preceding claims, wherein a Vorge- ben the operating state includes an interruption of an operation of the working device (3) and / or a drive of the working device (3).

13. A method for remotely controlling a self-propelled implement (3), comprising:

Transmitting an electromagnetic control signal in an effective direction

(WR) by a first transmitting device (4) arranged on a remote control (1),

Transmitting an electromagnetic security signal in a security area (S 1, S 2) by a second transmitting device (4, 6) arranged on the remote control (1), and

Predetermining an operating state of the working device (3) as a function of the safety signal;

wherein the security area (S l, S2) comprises a rear area (S2) opposite to the effective direction.