EP3840842B1 - Tragbares arbeitsgerät für den portablen einsatz - Google Patents

Tragbares arbeitsgerät für den portablen einsatz Download PDF

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Publication number
EP3840842B1
EP3840842B1 EP18815956.0A EP18815956A EP3840842B1 EP 3840842 B1 EP3840842 B1 EP 3840842B1 EP 18815956 A EP18815956 A EP 18815956A EP 3840842 B1 EP3840842 B1 EP 3840842B1
Authority
EP
European Patent Office
Prior art keywords
circuit board
printed circuit
water
work apparatus
electrical
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.)
Active
Application number
EP18815956.0A
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German (de)
English (en)
French (fr)
Other versions
EP3840842A1 (de
Inventor
Carsten Sauerbier
Thomas LITTWIN
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.)
Lukas Hydraulik GmbH
Original Assignee
Lukas Hydraulik GmbH
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 Lukas Hydraulik GmbH filed Critical Lukas Hydraulik GmbH
Priority to PL18815956.0T priority Critical patent/PL3840842T3/pl
Publication of EP3840842A1 publication Critical patent/EP3840842A1/de
Application granted granted Critical
Publication of EP3840842B1 publication Critical patent/EP3840842B1/de
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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
    • A62B3/00—Devices or single parts for facilitating escape from buildings or the like, e.g. protection shields, protection screens; Portable devices for preventing smoke penetrating into distinct parts of buildings
    • A62B3/005—Rescue tools with forcing action
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/005—Hydraulic driving means

Definitions

  • the present application relates to an electromechanical or electrohydraulic working device for portable use, such as a spreading device, cutting device or combination device with a cutting and spreading function or a lifting cylinder (or rescue cylinder).
  • a spreading device such as a spreading device, cutting device or combination device with a cutting and spreading function or a lifting cylinder (or rescue cylinder).
  • rescue cylinder such as a lifting cylinder (or rescue cylinder).
  • the aforementioned are preferably used for rescue operations.
  • Portable, motor-driven electromechanical or electrohydraulic tools or rescue tools of the type of interest here are used in a wide variety of applications.
  • the type of work equipment or rescue equipment is diverse.
  • Devices of this type are exposed to extremely high mechanical requirements in use and, depending on where they are used, are subject to a wide variety of environmental influences (heat, cold, moisture).
  • rescue equipment in particular ensures a particularly high level of operational reliability in use, since rescue operations must always be carried out quickly and unexpected operational failures can therefore have fatal consequences.
  • a working device in certain rescue situations, must also be operated under water, for example when a vehicle has been involved in an accident fell into a lake, river or stream. In such situations, it has hitherto been extremely difficult to rescue trapped people from their wrecked vehicles. In addition, in such a situation there is even less time for a rescue due to the possible ingress of water.
  • the previous devices were not suitable for underwater use.
  • U1 is a battery-operated underwater electrical device in the form of e.g. B. a pump known.
  • the underwater electrical device has a watertight tubular housing into which a housing end piece equipped with O-rings inserted in circumferential grooves is pressed.
  • the construction is very complex.
  • EP 1 724 043 A1 discloses a portable implement, such as a cutter, in which a tool head is driven by a simple hydraulic second piston.
  • the primary power comes from a first piston driven by a linear motor.
  • the first piston and the tool head are connected with a thin hydraulic line, whereby the motor, the first piston and a battery can be housed together in a unit that can be worn over the shoulder, for example.
  • the engine parts can be sealed.
  • the object of the present invention is to provide a working device which, on the one hand, allows use under water and, on the other hand, can be implemented with simple structural means.
  • a brushless DC motor is provided as the electric motor, the electronic components of a first circuit board are enclosed with casting compound to protect against the ingress of water, and the connection elements of the control cable are protected against the ingress of water
  • relatively simple design measures can be used to ensure that the portable work tool can be operated even if water should penetrate the interior of the housing.
  • the working device according to the invention can in particular also be used for rescue purposes, for example in a vehicle which is surrounded by water and in which there are still people. People can be rescued very quickly from a vehicle wreck with the new work tool.
  • a plug connection is provided as the connection means for the control cable on the first circuit board.
  • no protective and/or sealing measures are provided on the housing of the tool to prevent water from entering the interior of the housing if the housing is immersed in water.
  • Such protective or sealing measures are often very complex and cost-intensive in terms of construction, especially in the case of complicated housings.
  • connection means for connecting a control line, the connection means being protected against the ingress of water.
  • the control line itself usually has waterproof insulation.
  • Each control line expediently has a correspondingly sealed connection means.
  • a part of the respective connection means can be arranged on the circuit board side and can also be partly embedded there.
  • the opposite part of the connection means is located on the control line.
  • the connection means can be a plug-in connection or a plug-in/rotary connection, which can be sealed with a sealant, e.g. B. is sealed with an O-ring.
  • the housing may not include any protective and/or sealing measures to prevent water from entering the interior of the housing when the housing is immersed in water.
  • the electronic control and regulating device expediently comprises a display and/or control panel with a second circuit board on which electronic components, which are also enclosed with casting compound to protect against the ingress of water, can be arranged.
  • This second circuit board can be connected to the main circuit board remotely located in the housing via a control line as described above.
  • the electronic control and regulating device can include a sensor with a third circuit board, on which electronic components are also arranged, which are also enclosed with casting compound to protect against the ingress of water.
  • This additional third circuit board can also have a previously described Control line can be driven or connected to the main circuit board remotely located in the housing.
  • two boards can consist of the same board base material or board base plate equipped with electronic components, with one board being defined as a removal area from the other board (remainder of the board base material or board base plate) and the two boards already being fitted with a control cable are connected.
  • a soldered joint can be provided as a means of connecting the control cable or cables.
  • the electrical connections for power cables supplying power to the electric motor can be spaced apart at a sufficient distance to ensure that, in the event that the connections are surrounded by water, the electrical operating conditions of the working device (e.g. at a nominal voltage of 24 volts) via the water as the electrical conduction medium, no electrical short circuit occurs.
  • the power cords have a total of three strands (three phases).
  • a control panel can be provided on the implement.
  • This can include a waterproof membrane keyboard, ie membrane layering.
  • a circuit board can be provided in the area or below the control panel or the membrane keyboard. This additional circuit board can also have a previously described control line be driven or connected to the motherboard remotely located in the housing.
  • the front edge of the control panel preferably the membrane keyboard, can preferably also be covered by casting compound.
  • the casting compound thus hermetically seals the film layering laterally along the perimeter of the control panel.
  • a gap that preferably runs completely around the control panel can be provided.
  • the gap can be covered on the outside by a projection of the control panel, ie it can be overlapped. This makes it possible to encapsulate the arrangement “overhead” with encapsulation compound, since the excess length prevents the encapsulation compound from “leaking out”.
  • a slide-in slot with open contact pins located therein, that is to say unprotected from water, is provided for contacting the rechargeable battery.
  • the contact pins are also at a sufficient distance from one another, which ensures that if the contact pins are surrounded by water, the above-mentioned electrical operating conditions of the working device via the water as the electrical conduction medium, no electrical short circuit is established.
  • Control lines of the type described can connect the circuit boards to one another.
  • a membrane switch can be provided as an on and off switch.
  • a casting compound based on PU, epoxy or silicone is preferably used as the casting compound.
  • a silicone-based casting compound is particularly suitable when elevated temperatures occur.
  • Reference 1 in 1 denotes an example of an implement according to the invention in its entirety.
  • the working device 1 is an electro-hydraulic, battery-operated cutting device (cutter).
  • the working device 1 comprises a housing 12 in which an electric motor 3 in the form of a brushless DC motor, a hydraulic pump 2 and a hydraulic tank 19 with hydraulic fluid 30 are located (cf. also 2 and 3 ).
  • a compensating device for volume compensation of the hydraulic fluid is provided during operation of the working device 1 .
  • This can be, for example, a flexible membrane or an overall flexible hydraulic tank.
  • a control panel 25 with a display 14 and an on/off switch 13 is attached to the housing 12. The operating states can be read from the display 14 by the operator.
  • a slot 26 for a replaceable battery 18 is provided on the back of the housing. Instead of the battery, a (in 1 (not shown) power supply can be inserted.
  • the rated voltage for operating the device is e.g. B. 24 volts.
  • FIG. 1 there are two tool halves 35a, 35b on the front of the working device 1, which in 1 shown embodiment are cutting tool halves.
  • the two cutter halves are held together by a (in 1 not shown) driven piston rod.
  • the latter is located in a hydraulic cylinder 4.
  • a first handle 15 is located in the area of the hydraulic cylinder 4.
  • a second handle 16 is provided on the housing 12.
  • the working device 1 can thus be guided or operated by the operator with two hands.
  • a manually operable hydraulic valve 6 allows the operator to manually control the direction of hydraulic flow with his hand on the second handle 16 so that the piston rod is either retracted (closing die halves 35a, 35b) or extended (causing die halves 35a, 35b opened) or hydraulic oil is returned to the supply circuit, i.e. to the hydraulic tank (bypass operation).
  • the configuration of the control valve 6 shown is a control valve that can be rotated in the extension of the axis of the handle 16 and has a so-called star knob, which is rotated by the operator to control the switch positions.
  • the housing 12 comprises two housing shells which (cf. 3 ) are connected to one another via connecting elements 7, for example screws. No seal is provided to protect against water ingress into the housing 12 in the event of the housing 12 being submerged in water.
  • the invention can also be designed as a spreading device, a combination device with a cutting and spreading function or as a lifting or rescue cylinder. All of these devices use a piston rod that is guided in a cylinder, e.g. a hydraulic cylinder.
  • the electric motor is a brushless DC motor which drives two piston compressors 2a, 2b via an eccentric shaft 36.
  • the piston compressor 2b can have a greater capacity than the piston compressor 2a.
  • the flow of the piston compressor 2b is z. B. to a pressure switching valve 32 is passed.
  • the delivery flow of the piston compressor 2a is also passed to the pressure switching valve 32 as a control signal.
  • the pressure switching valve 32 can be set to a specific pressure switching value by means of spring force. If the pressure in the control line of the piston compressor 2a exceeds this pressure switching value, the pressure switching valve 32 is opened and the delivery flow of the piston compressor 2b is diverted into the tank 19. This ensures that the required drive power of the system remains within the available drive power.
  • the delivery flow branches in the further course in the direction of switching valve 6 and pressure cut-off valve 31.
  • the pressure cut-off valve 31 is on the permissible System pressure adjusted by means of spring force. If the pressure exceeds the set permissible system pressure, the pressure cut-off valve 31 opens and allows the delivery flow to flow back into the tank until the permissible pressure is fallen below again.
  • the control valve 6 is operated using a star handle (cf. 1 ) manually operated by the user. It has a spring-loaded return function to the neutral position. In the neutral position it is in the center position as shown. In this position, all connected lines are connected to the tank, so that no pressure can build up and the system does not move. If the control valve 6 is deflected to the right, for example, a pressurized delivery flow is conveyed in the direction of the double pilot-operated check valve 28 in the left connection line. Hydraulic oil, which comes from the direction of the double pilot-operated check valve 28, is returned to the tank 19 on the right connection line.
  • the process just described is reversed, so that ultimately the direction of movement of the device is reversed.
  • the delivery flow which is conveyed into the left-hand connection line of the double pilot operated check valve 28, opens a spring-loaded check valve in the left-hand connection line and, via a control line, which is routed to the right-hand connection line, also opens the check valve located there. This ensures that, on the one hand, the delivery flow in the left connection line can be fed to the hydraulic cylinder 4 of the device. On the other hand, it is ensured that the hydraulic oil, which is displaced from the hydraulic cylinder 4 on the right side of the cylinder, can be returned to the tank 19 of the system through the double pilot operated check valve 28 on the right connection line.
  • the hydraulic cylinder 4 has a branch to safety valves 29, 30 at both connections. These safety valves 29, 30 ensure that the pressure in the cylinder chambers cannot rise higher than permissible. If the pressure in one or both cylinder chambers rises above the safety-related permissible pressure, these valves open a connection the tank 19 so that the pressure can be released again.
  • the pressure inside the hydraulic cylinder 4 can increase, for example, because forces acting from outside on the piston of the hydraulic cylinder 4 additionally compress the hydraulic oil.
  • Devices are attached to the piston rod 5 of the hydraulic cylinder 4 which, for example, move a shearing blade, a spreader or the like.
  • the tank 19 can be designed, for example, as a flexible rubber bellows and serves at the same time as a compensating device.
  • the electronic control and regulating device for controlling and/or regulating includes a first circuit board 8 with electronic components 9, which relate in particular to the power supply for the brushless DC motor.
  • a control panel with a display 14 which has its own second circuit board 20 .
  • the control panel of the display 14 is preferably a waterproof membrane keyboard. The necessary operations can be carried out via the membrane keyboard.
  • the star handle not only changes the hydraulic position of the control valve 6, but also the electric motor is switched on and off and/or a turbo function is also switched on and/or off via the angular position of the star handle.
  • the sensor 21 is connected to the second circuit board 20 via a control line 10a.
  • the second circuit board 20 is connected to the first circuit board 8, which represents the main circuit board, via a further control line 10b.
  • the control line 10b is connected to the second circuit board 20 and/or the first circuit board 8 via waterproof connection means 11 .
  • a part of the respective connection means 11 can be arranged on the circuit board side and can also be partly embedded there.
  • the opposite part of the connection means 11 is located on the control line 10a or 10b.
  • the connection means 11 can be a plug-in connection and/or rotary connection act, which by a (not shown in the figures) sealant z. B. is sealed with an O-ring.
  • control lines 10a and/or 10b are lines via which control signals are sent.
  • connection means 11 of the control line 10b between the first circuit board 8 and the second circuit board 20 are in 3 Plug and / or rotary connector provided.
  • 8 power cables for the energy supply of the electric motor 3 are arranged in the area of the first circuit board, which are electrically connected to contact pins 27 for the battery or a power pack. In the example shown, it is a three-phase connection with three power cables 23a, 23b and 23c.
  • the electrical connections 24a to 24c of the power cables 23a, 23b and 23c for supplying energy to the electric motor 3 can be spaced apart at a sufficient distance from one another, which ensures that if the connections 24a to 24c are surrounded by water, the electrical operating conditions of the implement (z. B. at a nominal voltage of 24 volts) sets on the water as the electrical line medium no electrical short circuit.
  • Corresponding connections are also provided on the electric motor 3, but in 3 not visible.
  • contact pins 27 Open, i.e. unprotected from water, contact pins 27 for electrical contact with (an in 4 (each not shown) rechargeable battery or a power pack are provided in the area of the insertion slot 26 .
  • the contact pins 27 are also at a sufficient distance from one another, which ensures that if the contact pins 27 are surrounded by water, no electrical short circuit occurs under the electrical operating conditions of the tool via the water as the electrical conduction medium.
  • the contact pins 27 and the first circuit board 8 are attached to a housing part 12a (battery holder).
  • the control line 10b includes water-protected connection means 11.
  • the electronic components 9 of the second circuit board 20 can be seen, which are enclosed by the casting compound 17 .
  • the circuit board-side part of the connection means 11 for the circuit board 20 can be seen.
  • the control panel 25 is designed as a membrane keyboard. This is a sandwich-shaped film layer structure.
  • the front edge of the control panel 25, ie of this structure, is also covered by the casting compound 17.
  • a gap 37 to the housing 12 is provided in the area of the front edge of the control panel 25 , preferably running all the way around the control panel 25 .
  • the gap 37 is covered on the outside by an overhang 38 of the control panel 25 or the membrane keyboard (e.g.
  • the magnetic sensor 21 for determining the deflection of the star grip can be seen.
  • This is located on its own third board 22, which is housed in a sensor holder 33 in the form of a pocket-shaped recess.
  • Magnetic sensor 21 and circuit board 22 are sealed off from the outside of sensor holder 33 by a casting compound 17 .
  • the casting compound 17 thus closes the pocket-like recess of the sensor holder 33 to the outside.
  • the control line 10a which leads from the third circuit board 22 to the second circuit board 20 of the control panel or display 14, is also connected to the third circuit board 22 and surrounded by the casting compound 17.
  • the end area of the control line 10a is also enclosed by the casting compound 17 there.
  • FIG. 7 shows the two circuit boards 20, 22 with electronic components 9 (the circuit board 22 with an electronic component, for example in the form of the magnetic sensor 21) in the initial state before assembly. They consist of the same board base material.
  • the third board 22 is set as an extraction area from the other second board 20 .
  • Both boards 20, 22 are connected via the control cable 10a connected.
  • a soldered connection is provided as the respective connecting means 11 on both circuit boards 20, 22.
  • two intended separation points 40 are provided, which must be destroyed in order to remove the third circuit board 22, as a result of which the circuit board 22 with the wiring can be removed.
  • the connecting means 11 are then enclosed with the casting compound 17 when the circuit boards 20, 22 are cast.
  • control panel 25 shows an enlarged, isolated representation of the control panel 25 with the on/off switch 13 and the display 14 with various displays and control panels.
  • the control panel 25 is preferably designed as a waterproof membrane keyboard.
  • the present invention makes it possible to also operate the working device 1 under water, without the housing 12 having to be sealed. This new, important functionality can thus be achieved without complex conversion measures or without a significant increase in the production costs.
  • the electronic components of the first circuit board 8, second circuit board 20 and/or third circuit board 22 are, in particular, microcontrollers, frequency converters, memory modules, electronic switches, measuring devices such as B. integrated semiconductor temperature sensors and / or LEDs.
  • the display 14 includes a display device, which in turn can include, for example, a load display and/or an operating status display and/or a temperature display.
  • the rechargeable battery 18 has a watertight housing or at least an independent watertight encapsulation.
  • the on/off switch 13 is a waterproof on/off switch, for example a membrane switch or a pushbutton switch.
  • a casting compound based on PU, epoxy or silicone can preferably be used as the casting compound.
  • a silicone-based casting compound is particularly suitable if elevated temperatures occur during operation of the working device 1 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Push-Button Switches (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Portable Power Tools In General (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
EP18815956.0A 2018-11-26 2018-11-26 Tragbares arbeitsgerät für den portablen einsatz Active EP3840842B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL18815956.0T PL3840842T3 (pl) 2018-11-26 2018-11-26 Przenośne urządzenie robocze do użytku przenośnego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2018/082545 WO2020108727A1 (de) 2018-11-26 2018-11-26 Tragbares arbeitsgerät für den portablen einsatz

Publications (2)

Publication Number Publication Date
EP3840842A1 EP3840842A1 (de) 2021-06-30
EP3840842B1 true EP3840842B1 (de) 2022-10-26

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ID=64664231

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18815956.0A Active EP3840842B1 (de) 2018-11-26 2018-11-26 Tragbares arbeitsgerät für den portablen einsatz

Country Status (6)

Country Link
US (1) US11911639B2 (zh)
EP (1) EP3840842B1 (zh)
JP (1) JP7307169B2 (zh)
CN (1) CN112996572B (zh)
PL (1) PL3840842T3 (zh)
WO (1) WO2020108727A1 (zh)

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BUCHENAU SVEN: "Hydraulische Rettungsgeräte im Unterwassereinsatz", FEUERWEHRMAGAZIN.DE, 29 March 2018 (2018-03-29), Internet, pages 1 - 5, XP055785795, Retrieved from the Internet <URL:https://www.feuerwehrmagazin.de/nachrichten/news/hydraulische-rettungsgeraete-im-unterwassereinsatz-79167> [retrieved on 20210315] *
PSEUDONYM JAVIER: "Nemo Power Tools - Waterproof power tools - Tool Craze", TOOL CRAZE BLOG, 15 December 2015 (2015-12-15), InterNet, XP055786568, Retrieved from the Internet <URL:https://toolcraze.net/nemo-power-tools-waterproof-power-tools/> [retrieved on 20210316] *

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EP3840842A1 (de) 2021-06-30
PL3840842T3 (pl) 2023-07-24
US20220001215A1 (en) 2022-01-06
JP7307169B2 (ja) 2023-07-11
CN112996572B (zh) 2022-12-13
US11911639B2 (en) 2024-02-27
JP2022519422A (ja) 2022-03-24
WO2020108727A1 (de) 2020-06-04

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