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GB2353180A - Automatic security system particularly for plant and machinery - Google Patents

Automatic security system particularly for plant and machinery Download PDF

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Publication number
GB2353180A
GB2353180A GB9913433A GB9913433A GB2353180A GB 2353180 A GB2353180 A GB 2353180A GB 9913433 A GB9913433 A GB 9913433A GB 9913433 A GB9913433 A GB 9913433A GB 2353180 A GB2353180 A GB 2353180A
Authority
GB
United Kingdom
Prior art keywords
key
machinery
control system
control device
plant
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
GB9913433A
Other versions
GB9913433D0 (en
Inventor
David George Watts
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB9913433A priority Critical patent/GB2353180A/en
Publication of GB9913433D0 publication Critical patent/GB9913433D0/en
Publication of GB2353180A publication Critical patent/GB2353180A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • B60R25/245—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user where the antenna reception area plays a role
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C5/00—Registering or indicating the working of vehicles
    • G07C5/08—Registering or indicating performance data other than driving, working, idle, or waiting time, with or without registering driving, working, idle or waiting time
    • G07C5/0841—Registering performance data
    • G07C5/085—Registering performance data using electronic data carriers
    • G07C5/0858—Registering performance data using electronic data carriers wherein the data carrier is removable
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00182—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with unidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/20—Individual registration on entry or exit involving the use of a pass
    • G07C9/28—Individual registration on entry or exit involving the use of a pass the pass enabling tracking or indicating presence
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00793—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by Hertzian waves

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Lock And Its Accessories (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

A security card which incorporates an electronic key communicates with a control device on a vehicle, civil engineering plant or machinery such that the machinery is operable when the key is within a first predetermined distance, and partially or totally inoperable when the key is further than a second predetermined distance from the control device. The key may communicate an ID code using radio frequency signals. The key may be programmed to operate several different machines and a machine may be operable by several different keys. The key may be incorporated in a security badge to be worn by authorised operators and the key may act as an access key to particular buildings or site areas. The key may co-operate with recording machinery to record the movements of the key carrier and the time when a piece of machinery is used.

Description

2353180 AUTOMATIC SECURITY SYSTEM, PARTICULARLY FOR PLANT AND MACHINERY
This invention relates to a n automatic control system, particularly suitable for automatic control of the operability of plant and machinery.
Many items of plant and machinery should only be operated by designated individuals or a designated class of individuals. For example, many machines used in the civil engineering industry require specialist training for safe operation and yet can be operated to an extent by untrained operators. It is, in the circumstances, highly desirable that operation of such machines be restricted to operators trained to operate the particular machine in question. The machine may be highly specialised (for example a pile drilling machine), and the authorised operator of such a machine may only be skilled in operat ing that particular machine. The machine may, however, be part of a general class (for example earth moving machines) which although specialist in nature are often used by operators skilled in more than one machine within the class. Thus it is desirable for one particular operator who is skilled, for example, in the use of both a bulldozer and a scraper to be able to use either machine on a civil engineering site whilst, at the same time, all other personnel on the civil engineering site are excluded from operating either machine.
The problems of providing adequate control over the use of machines is significant. Since most machines are fitted with a key operated engine control it is at first sight possible utilize the engine key for the purpose of controlling use of the machine. However, such procedures are cumbersome and are very liable to be ignored in use - engines of machines are commonly left idling whilst the operator is temporarily away from the machine and it is under such circumstances that unauthorised use of the machine is particularly dangerous.
Keyless door locking systems have been proposed for motor vehicles. One such system is disclosed, for example, in EP-A-0343619. However, such systems could only be used on plant or machinery having a lockable door, and this is very often not the case.
Accordingly, one aspect of the present invention provides an automatic control system, particularly suitable for plant and machinery, comprising: a control device having a first state in which the plant or machinery is operable and a second state in which the plant or machinery cannot be operated or can only be operated to a limited extent; and a key for controlling the state of the control device, the control device being responsive to the position of the key relative to a part of the control device whereby if the key is within a first pre-determined distance of the said part the control device is automatically placed in its first state and if the key is greater than a second pre-determined distance from the said part the control device is automatically placed in its second position.
With the preferred embodiment of the invention thekey will be carried by an authorised user of the relevant plant or machinery. When that user is within the first predetermined distance from the relevant part of the control device the plant or machinery will be available for use. When the authorised user is greater than the second predetermined distance from the relevant part of the control device the plant or machinery will be disabled in whole or in part.
The preferred embodiments of the invention give rise to considerable subtlety in the design of particular control systems. For example, the control device may completely shut down the relevant plant or machinery, e.g. by stopping an internal combustion engine which provides motive power or by disconnecting the plant or machinery from a source of electrical power. In the alternative, however, the system may simply disable certain aspects of operation of the relevant machine. For example, in the case of a mobile crane the system may disable the crane controls but leave the movement controls of the mobile -3crane operable. Thus, personnel other than the authorised operator may move the mobile crane, but no one other than the authorised operator can operate the crane controls.
Further, a particular key may be programmed to permit operation of several different pieces of plant or machinery or only a single piece of plant or machinery. Alternatively, or additionally the control device of a particular piece of plant or machinery may be programmed to respond to several different keys. Thus in the case referred to above an operator competent only in the use of a pile drilling rig may carry a key which controls only the operation of the pile drilling rig. An operator competent in use of several classes of earth moving machinery may carry a key effective to make any of the classes of machine for which the operator is trained available for his use.
Conveniently, the key will communicate with the control device by means of radio frequency signals. Preferably, the key is incorporated in a device providing additional security measures to ensure it is only used by the authorised operator. For example, the key may be incorporated within a security badge which bears a picture of the authorised operator. The key system may, if desired, perform auxiliary functions. For example, the key may act as an access key enabling those carrying it to have access to particular buildings or parts of a site. Also, the key may co- operate with suitable recording machinery to record the movement or position of the carrier of the key. For example, a particular piece of plant or machinery may include a recording device which records which operator used the machine at which time.
It will be appreciated that the operation of the control system in accordance with the preferred embodiment of the invention is entirely automatic. When the authorised user approaches a particular piece of plant or machinery the control device will change to its first state and make the plant and machinery available for immediate use by the operator. When the operator is greater than the second predetermined distance from the relevant part of the control device the control device will automatically change to its second state and in whole or in part disable operation of the plant or machinery.
The invention will be better understood from the following description of a preferred embodiment thereof, given by way of example only, reference being had to the accompanying drawing wherein the single figure is a side view of a bulldozer incorporating an automatic control system according to the pesent invention.
The bulldozer 1 illustrated in the drawing comprises a conventional chassis 2 mounted on crawler tracks 3, and a dozer blade 4 mounted for movement relative to the chassis. A seat 5 is provided for the operator and a set of rollover bars 6 support a canopy 7 to protect the operator from rain and sun. However, as is conventional the bulldozer does not have a "cab" and accordingly there are no doors which may be locked in order to prevent access to the operator's position. As will be understood by those skilled in the art, the operator has available to him a range of controls for raising and lowering the dozer blade and controlling the crawler tracks to move and steer the bulldozer. Additional controls may be provided, for example, to control a winch 8 mounted on the rear of the chassis.
Bulldozers of the type illustrated in the drawing are often provided with large diesel engines which require relatively complex starting procedures, for example employing a donkey engine for starting the main engine. For this reason, it is highly undesirable for the engine to be switched off whenever the operator leaves his operating position. Equally, it is highly undesirable that the bulldozer is left available for use when the operator is not in the operating position since unauthorised operators may, under these circumstances, attempt to use the bulldozer or to move it. With plant of this type such unauthorised use is highly undesirable.
With a view to avoiding the problem of unauthorised use the bulldozer is fitted with an automatic control system in accordance with the present invention. The control system incorporates a control device which, when in a second state, renders inoperative the controls of the bulldozer. The control device may be effective to render inoperative the controls by any suitable means - for example mechanically locking the controls or closing a master valve which isolates the controls from hydraulic fluid. The control device includes a sensor 9 which is mounted on the rollover bars 6 fitted above the drivers seat.
The driver is provided with a security card which incorporates an electronic key. The electronic key communicates with the sensor 9 and when the key is within a first pre-determined distance of the sensor the control device is automatically placed in its first state thereby rendering the bulldozer controls fully operative. The first predetermined distance may, for example, be two metres. The arrangement is such. that when the key is greater than a second pre-determined distance (for example four metres) from the sensor 9 the control device is automatically shifted into its second position and the bulldozer controls are disabled.
The preferred embodiment of the present invention may, in its simplest form, consist of a single key associated with a single control device thereby enabling a single operator only to access and operate a particular piece of machinery. It is envisaged, however, that more complex systems will in general be employed. For example, in a civil engineering contract different operators may be authorised to operate different machines and some operators may be authorised to operate several machines. By appropriately coding the keys and control devices such arrangements may automatically be implemented by use of the preferred embodiment of the invention. Further, the keys may be used to operate auxiliary security systems, for example to allow access to a site or to log which particular individual has been operating a particular machine at a particular time.
It will be appreciated that the invention is of wide general applicability and may be used in many industries other than civil engineering. For example, within the context of a manufacturing industry the present invention may be used to prevent unauthorised operation of machine tools by other than trained operators and unauthorised changing of machine settings other than by suitably authorised personnel. Any particular machine may have several levels of control - for example operation of the machine may be restricted to certain trained operators whilst access to the machine controls may be restricted to other trained staff. Again, signals from the keys may be used to log the operation of a particular machine.
In a particularly preferred embodiment of the invention the key comprises a badge worn by or attached to an operator. The badge may, for example, be an identity badge incorporating a photograph of the operator. The key may be powered by primary cells or one or more rechargeable cells if a battery charging system is provided.
Preferably, each key has a unique ID code which can conveniently be programmed in at the time of manufacture. The badge preferably transmits its ID code at suitable predetermined intervals, for example intervals of between 10 and 20 seconds. The ID signal may be transmitted using VHF or UHF frequencies via an internal antenna. Preferably, each transmission comprises several continuous repetitions of the ID code so as to enable the sensing means on the plant or machinery to detect at least one full ID code. The ID code may be transmitted at regular intervals or random or pseudo-random intervals. In the event that the authority represented by a particular key is withdrawn (for example because the key is lost or the operator in question is no longer authorised to use the relevant machine), the control device on the machine can readily be re-prograrnmed so as not to be responsive to the ID signal of the key in question.

Claims (15)

1. An automatic control system, particularly suitable for plant and machinery, comprising: a control device having a first state in which the plant or machinery is operable and a second state in which the plant or machinery cannot be operated or can only be operated to a limited extent; and a key for controlling the state of the control device, the control device being responsive to the position of the key relative to a part of the control device whereby if the key is within a first predetermined distance of the said part the control device is automatically placed in its first state and if the key is greater than a second pre-determined distance from the said part the control device is automatically placed in its second state.
2. An automatic control system according to claim 1 wherein the control device, when in the first state, completely shuts down the relevant plant or machinery.
3. An automatic control system according to claiml or claim 2 wherein the control device, when in the first state, stops an internal combustion engine which provides motive power to the plant or machinery or disconnects the plant or machinery from a source of electrical power.
4. An automatic control system according to claim 1 wherein the control device, when in the first state, disables certain aspects of operation of the relevant machine.
5. An automatic control system according to any preceding claim wherein the key may be programmed to permit operation of several different pieces of plant or machinery.
6. An automatic control system according to any of claims 1 to 4 wherein the key may be programmed to permit operation of or only a single piece of plant or machinery.
7. An automatic control system according to claim 1 wherein the control device may be programmed to respond to several different keys.
8. An automatic control system according to any preceding claim wherein the key communicates with the control device by means of radio frequency signals.
9. An automatic control system according to any preceding claim wherein the key is 'incorporated in a device providing additional security measures to ensure it is only used by the authorised operator.
10. An automatic control system according to claim 9 wherein the key is incorporated within a security badge which bears a picture of the authorised operator.
11. An automatic control system according to any preceding claim wherein the key system performs auxiliary functions.
12. An automatic control system according to claim I I wherein the key acts as an access key enabling those carrying it to have access to particular buildings or parts of a site.
13. An automatic control system according to claim I I or claim 12 wherein the key co-operates with suitable recording machinery to record the movement or position of the carrier of the key.
14. An automatic control system according to claim 13 wherein a particular :: ",.. 0, 4 piece of plant or machinery includes a recording device which records which operator used the machine at which time.
15. An automatic control system substantially as hereinbefore described with reference to the accompanying drawing.
I
GB9913433A 1999-06-09 1999-06-09 Automatic security system particularly for plant and machinery Withdrawn GB2353180A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9913433A GB2353180A (en) 1999-06-09 1999-06-09 Automatic security system particularly for plant and machinery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9913433A GB2353180A (en) 1999-06-09 1999-06-09 Automatic security system particularly for plant and machinery

Publications (2)

Publication Number Publication Date
GB9913433D0 GB9913433D0 (en) 1999-08-11
GB2353180A true GB2353180A (en) 2001-02-14

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2824943A1 (en) * 2001-05-21 2002-11-22 Siemens Automotive Sa Badge to vehicle communication procedure for hands free unlocking
WO2003062027A1 (en) * 2001-12-21 2003-07-31 Atlas Copco Rock Drills Ab Method and system for identification
EP1262385A3 (en) * 2001-05-31 2004-01-02 ArvinMeritor Light Vehicle Systems (UK) Ltd Start system
GB2396238A (en) * 2002-12-11 2004-06-16 Nippon Yusoki Co Ltd Preventing an unqualified person from driving a vehicle
EP1441077A1 (en) * 2003-01-24 2004-07-28 Komatsu Ltd. work machine management device
GB2452635A (en) * 2007-09-10 2009-03-11 Fisher Rosemount Systems Inc Location dependent control access in a process control system
GB2462590A (en) * 2008-08-05 2010-02-17 Elliot Harrison-Croft Proximity safety system for vehicle and personnel using ID tags, with vehicle immobilization and event logging.
WO2010031487A1 (en) * 2008-09-17 2010-03-25 Khs Ag Industrial plant and method for operating an industrial plant
EP2407705A1 (en) * 2010-07-13 2012-01-18 Joseph Vögele AG Construction machine with presence recognition system
WO2012013575A1 (en) * 2010-07-26 2012-02-02 Alfred Kärcher Gmbh & Co. Kg Cleaning device
WO2012016847A1 (en) * 2010-07-26 2012-02-09 Alfred Kärcher Gmbh & Co. Kg Cleaning device
EP2469480A1 (en) * 2010-12-21 2012-06-27 SimonsVoss Technologies AG Safety system and safety method
WO2018189564A1 (en) * 2017-04-10 2018-10-18 Gryt Kommanditbolag Secure autostop
EP2186064B1 (en) * 2007-07-26 2020-01-01 Robert Bosch GmbH Tool management system
EP3730451A1 (en) * 2019-04-23 2020-10-28 STILL GmbH Access control system of a mobile working machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023138A (en) * 1975-11-17 1977-05-10 Joseph Ballin Vehicle theft prevention system
GB2286634A (en) * 1994-02-21 1995-08-23 Toad Innovations Ltd Vehicle theft prevention system
US5459448A (en) * 1994-06-27 1995-10-17 Dortenzio; Christopher J. Automotive continuous protection anti-theft system
GB2307378A (en) * 1995-11-14 1997-05-21 Siemens Ag Antenna device for vehicle anti-theft system
WO1997039924A1 (en) * 1996-04-24 1997-10-30 Steve Murray Radio controlled engine kill switch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4023138A (en) * 1975-11-17 1977-05-10 Joseph Ballin Vehicle theft prevention system
GB2286634A (en) * 1994-02-21 1995-08-23 Toad Innovations Ltd Vehicle theft prevention system
US5459448A (en) * 1994-06-27 1995-10-17 Dortenzio; Christopher J. Automotive continuous protection anti-theft system
GB2307378A (en) * 1995-11-14 1997-05-21 Siemens Ag Antenna device for vehicle anti-theft system
WO1997039924A1 (en) * 1996-04-24 1997-10-30 Steve Murray Radio controlled engine kill switch

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2824943A1 (en) * 2001-05-21 2002-11-22 Siemens Automotive Sa Badge to vehicle communication procedure for hands free unlocking
WO2002095690A1 (en) * 2001-05-21 2002-11-28 Siemens Vdo Automotive S.A.S. Communication method between a badge and a motor vehicle
US6958682B2 (en) 2001-05-21 2005-10-25 Siemens Vdo Automotive Communication method between a badge and a motor vehicle
EP1262385A3 (en) * 2001-05-31 2004-01-02 ArvinMeritor Light Vehicle Systems (UK) Ltd Start system
WO2003062027A1 (en) * 2001-12-21 2003-07-31 Atlas Copco Rock Drills Ab Method and system for identification
AU2002359168B2 (en) * 2001-12-21 2008-07-03 Epiroc Rock Drills Aktiebolag Method and system for identification
GB2396238A (en) * 2002-12-11 2004-06-16 Nippon Yusoki Co Ltd Preventing an unqualified person from driving a vehicle
GB2396238B (en) * 2002-12-11 2006-05-24 Nippon Yusoki Co Ltd Unqualified person driving prevention apparatus for vehicle
EP1441077A1 (en) * 2003-01-24 2004-07-28 Komatsu Ltd. work machine management device
US6856879B2 (en) 2003-01-24 2005-02-15 Komatsu Ltd. Work machine management device
EP2186064B1 (en) * 2007-07-26 2020-01-01 Robert Bosch GmbH Tool management system
US9244455B2 (en) 2007-09-10 2016-01-26 Fisher-Rosemount Systems, Inc. Location dependent control access in a process control system
GB2452635A (en) * 2007-09-10 2009-03-11 Fisher Rosemount Systems Inc Location dependent control access in a process control system
US9760075B2 (en) 2007-09-10 2017-09-12 Fisher-Rosemount Systems, Inc. Location dependent control access in a process control system
GB2452635B (en) * 2007-09-10 2013-01-16 Fisher Rosemount Systems Inc Location dependant control access in a process control system
GB2462590A (en) * 2008-08-05 2010-02-17 Elliot Harrison-Croft Proximity safety system for vehicle and personnel using ID tags, with vehicle immobilization and event logging.
WO2010031487A1 (en) * 2008-09-17 2010-03-25 Khs Ag Industrial plant and method for operating an industrial plant
US8459396B2 (en) 2010-07-13 2013-06-11 Joseph Vögele AG Building machine comprising a presence detection system
EP2407705A1 (en) * 2010-07-13 2012-01-18 Joseph Vögele AG Construction machine with presence recognition system
US8622165B2 (en) 2010-07-13 2014-01-07 Joseph Vogele Ag Building machine comprising a presence detection system
US8957758B2 (en) 2010-07-26 2015-02-17 Alfred Kärcher Gmbh & Co. Kg Cleaning appliance
CN103025223A (en) * 2010-07-26 2013-04-03 阿尔弗雷德·凯驰两合公司 Cleaning device
CN102984984A (en) * 2010-07-26 2013-03-20 阿尔弗雷德·凯驰两合公司 Cleaning device
CN102984984B (en) * 2010-07-26 2015-11-25 阿尔弗雷德·凯驰两合公司 cleaning equipment
CN103025223B (en) * 2010-07-26 2016-03-09 阿尔弗雷德·凯驰两合公司 Cleaning equipment
US9367044B2 (en) 2010-07-26 2016-06-14 Alfred Kärcher Gmbh & Co. Kg Cleaning appliance in which access is granted based on an authorization carrier and authorization profile
EP2598013B1 (en) 2010-07-26 2017-05-17 Alfred Kärcher GmbH & Co. KG Cleaning device
EP2598014B1 (en) 2010-07-26 2017-05-17 Alfred Kärcher GmbH & Co. KG Cleaning device
WO2012016847A1 (en) * 2010-07-26 2012-02-09 Alfred Kärcher Gmbh & Co. Kg Cleaning device
WO2012013575A1 (en) * 2010-07-26 2012-02-02 Alfred Kärcher Gmbh & Co. Kg Cleaning device
EP2469480A1 (en) * 2010-12-21 2012-06-27 SimonsVoss Technologies AG Safety system and safety method
WO2018189564A1 (en) * 2017-04-10 2018-10-18 Gryt Kommanditbolag Secure autostop
EP3730451A1 (en) * 2019-04-23 2020-10-28 STILL GmbH Access control system of a mobile working machine

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)