WO2002031785A1 - Dispositif de securite pour machines electriques - Google Patents

Dispositif de securite pour machines electriques Download PDF

Info

Publication number
WO2002031785A1
WO2002031785A1 PCT/GB2000/003939 GB0003939W WO0231785A1 WO 2002031785 A1 WO2002031785 A1 WO 2002031785A1 GB 0003939 W GB0003939 W GB 0003939W WO 0231785 A1 WO0231785 A1 WO 0231785A1
Authority
WO
WIPO (PCT)
Prior art keywords
machine
reset
power supply
latch means
state
Prior art date
Application number
PCT/GB2000/003939
Other languages
English (en)
Inventor
Peter James Turnbull
Original Assignee
Prizeman, Steven, Leonard
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 Prizeman, Steven, Leonard filed Critical Prizeman, Steven, Leonard
Priority to AU2000278049A priority Critical patent/AU2000278049A1/en
Priority to PCT/GB2000/003939 priority patent/WO2002031785A1/fr
Publication of WO2002031785A1 publication Critical patent/WO2002031785A1/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/1409—Mechanical actuation by lifting or attempted removal of hand-portable articles for removal detection of electrical appliances by detecting their physical disconnection from an electrical system, e.g. using a switch incorporated in the plug connector
    • G08B13/1418—Removal detected by failure in electrical connection between the appliance and a control centre, home control panel or a power supply
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B9/00—Safety arrangements
    • G05B9/02—Safety arrangements electric

Definitions

  • This invention relates to controlling electrical machines. It is concerned more particularly but not exclusively with hand-held portable power tools.
  • a major difficulty encountered on many sites where hand-held powered tools are used is that when the tool is left unattended, even for a short time, it is likely to be stolen.
  • An object of the present invention is to ensure that an electrical machine cannot be used by unauthorised personnel when removed from a site.
  • the key means is physically separable from the machine and means are provided for ensuring that if the key means are so separated whilst the machine is connected to a power supply then the states of the latch means remain unaffected until the machine is disconnected from its power supply.
  • the latch means may comprise relay devices each having a relay coil and each drivable from a RESET to a SET state when its relay coil is energised and some of which relay devices are driven to a SET state by operation of said key means and are held in that state thereafter whilst the machine is connected to an electrical power supply.
  • Each relay device may have a SET output and a RESET output and connectors may be provided from each relay device to its associated part, the connectors being connected to either the SET outputs or the RESET outputs in said coded pattern.
  • Each relay device may have a pair of ganged relays one of which relays provides SET and RESET outputs and the other of which relays, when the device is in its SET state, is coupled to a power supply to hold the relay device SET.
  • an ON/OFF power switch is included which is so connected that when the switch is in its OFF state the SET and RESET states of the latch means remain unaffected.
  • the machine may comprising a portable power tool and may include detachable plug means for connection to a power supply so that detachment of the plug means from the power supply causes all the latch means to revert to their RESET state.
  • Figure 1 is a schematic circuit diagram of a power tool showing the interconnection of its field coils and* its armature
  • Figure 2 is a circuit diagram of circuitry now proposed for use in controlling operation of the power tool
  • Figure 3 is a circuit diagram of an individual latch forming part of the circuitry of
  • An electrical power tool for example a drill, has a rotor or armature 10, upper field windings or coils 12, 14 and lower field coils 16, 18.
  • the upper field coils 12, 14 are connectable to an electrical power supply line 20 via a switch 22.
  • the lower field coils 16, 18 are connectable to a neutral line 24 of the electrical power supply.
  • the power supply may be the mains electrical supply or the output of a transformer connected to a mains electrical supply.
  • FIG. 2 shows the additional circuitry now proposed and the parts of the power tool shown in Fig. 1 are also shown in Fig. 2 and have similar reference numbers therein.
  • a plurality 30 of latches (30a, 30b, 30c ... 30h) respectively connected to the ends of the coils 12, 14, 16 and 18 and to corresponding ones of a plurality 32 of connectors (32 A, 32B, 32C ... 32H).
  • Each of the connectors 32 has two input pins (e.g. 32Ail, 32Ai2 etc) and two output pins (e.g. 32Aol and 32Ao2).
  • a selected one of the two input pins in each connector is hardwired to the corresponding one of its output pins (e.g.
  • pin 32Ai2 is wired to pin 32Ao2).
  • One side of armature 10 is connected to both output pins of connectors 32A and 32B and the opposite side of armature 10 is connected to both output pins of connectors 30C and Operating electrical power for the power tool is provided from a flexible power cable having a live power line 20 and a neutral return line 24.
  • An ON/OFF switch 22 for the tool is provided in line 20. Its load terminal is connected to an additional latch 30i one output pin of which is connected to both output pins of connectors 32E and 32F.
  • the neutral 24 of the electrical power supply is connected to both output pins of connectors 32G and 32H.
  • Electrical live power line 20 and neutral line 24 are also directly connected to the input of a 24VDC output power supply unit 34. It will be noted that the connection to unit 34 is taken from the live side of switch 22.
  • the set of connectors 32 act as a coding device.
  • the actual pattern that is coded is represented by the wiring pattern.
  • Connector 32A in which pin 32Ai2 is connected to pin 32Ao2
  • connector 32B in which pin 32Bil is connected pin 32Bol
  • the eight connectors shown are internally connected to represent the eight binary digit code '101010'.
  • Each latch 30 is of the form shown in detail in Figure 3.
  • Each latch 30 comprises a pair of ganged relays 40, 42 controlled by a relay coil 44. The lower (as viewed in the
  • relay 42 is connected to ground via coil 44 and coil 44 is shunted by a diode
  • the pair of relays 40, 42 are normally in the RESET state shown with the lower relay 42 contacting an output pin 42-1 whilst the upper relay 40 contacts an output pin
  • the output of the 24NDC power supply 34 is applied to inputs 48 of selected latches 30. Selection of which latches are energised is determined by a coded key 54. Key 54 is, in accordance with one embodiment of the invention, physically insertable in the power tool and on being inserted is coupled via a link 56 to the 24NDC power supply
  • Key 54 has a plurality of outputs 54a, 54b ... 54h. Each output from key 54 is connected to the corresponding input 48 of relay latches 30a, 30b ... 30h respectively.
  • the pattern of supplied and unsupplied contacts 54a, 54b ... 54h of key 54 can also be represented by a binary code. If a supplied contact is designated as '1' and an unsupplied contact is designated '0' then the exemplary connection pattern of contacts 54a, 54b ... 54h that is illustrated in Fig. 2 can be represented by the eight digit binary code '10101010'. On energisation of supply line 20, as by plugging in the power tool of Fig.
  • 24N DC supply unit 34 becomes live and if key 54 is inserted then the latches which are SET are those connected to a key contact designated by a '1' while the latches connected to a key contact designated by a '0' remain in their RESET state.
  • the pattern of SET and RESET latches 30 corresponds to the code pattern of the hard- wired connectors 32 (which in the example of Fig. 2 is also represented by the binary code ' 10101010') then the field coils 12, 14, 16 and 18 and the armature 10 are all connected between the load side of switch 22 in mains power line 20 and to the neutral return line 24 in the correct sequence.
  • the power tool can now be operated. Because of the way latches 30 are configured those that are SET will remain SET for as long as the power tool is connected to the electrical supply.
  • key 54 can be removed from the power tool and placed in for example the pocket of a person using the tool and use of the tool can be continued.
  • switch 22, which could be a trigger-operated switch of the power tool can be repeatedly turned OFF and ON without requiring re-insertion of the key.
  • latches 30 will all RESET and it will not thereafter be possible to begin using the machine without insertion of key 54.
  • embodiments in accordance with the invention may replace the key 54 which is physically removable from the tool by some other means of inputting the desired pattern for example a keypad. It will also be appreciated that embodiments of the invention cover arrangements in which the pattern of the connectors 30 may be pre-set by a user (using a keypad for example) in order that the particular sequence of numbers to be input to enable operation of the tool can be personally chosen.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Safety Devices In Control Systems (AREA)

Abstract

L'invention concerne une machine électrique, un outil à commande électrique, par exemple, comprenant plusieurs éléments fonctionnels, telles que des bobines de champ et un induit. Chaque élément est séparément connecté à des verrous pouvant être chacun à l'état SET ou RESET. Les connexions entre les éléments de la machine et les verrous sont conçues sous forme de motif codé de façon que la machine ne puisse fonctionner que lorsque certains des verrous se trouvent à l'état SET et que d'autres verrous se trouvent à l'état RESET. Lorsqu'une clé amovible comprenant des connexions sous forme de motif codé correspondant est introduite dans la machine et que cette dernière est mise en marche, les verrous appropriés sont à l'état SET alors que les autres verrous sont à l'état RESET, ce qui permet d'obtenir toutes les connexions nécessaires au fonctionnement de la machine. La clé peut alors être retirée sans que cela n'affecte la fonctionnalité de la machine, à condition que cette dernière soit toujours alimentée. La machine peut également comprendre un interrupteur MARCHE/ARRET pouvant être utilisé à souhait sans que cela n'affecte les états des verrous. Toutefois, lorsque l'alimentation est coupée, lors du débranchement de la machine, par exemple, on ne peut plus utiliser la machine tant que la bonne clé n'a pas été introduite.
PCT/GB2000/003939 2000-10-12 2000-10-12 Dispositif de securite pour machines electriques WO2002031785A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2000278049A AU2000278049A1 (en) 2000-10-12 2000-10-12 Controlling electrical machines
PCT/GB2000/003939 WO2002031785A1 (fr) 2000-10-12 2000-10-12 Dispositif de securite pour machines electriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/GB2000/003939 WO2002031785A1 (fr) 2000-10-12 2000-10-12 Dispositif de securite pour machines electriques

Publications (1)

Publication Number Publication Date
WO2002031785A1 true WO2002031785A1 (fr) 2002-04-18

Family

ID=9886009

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2000/003939 WO2002031785A1 (fr) 2000-10-12 2000-10-12 Dispositif de securite pour machines electriques

Country Status (2)

Country Link
AU (1) AU2000278049A1 (fr)
WO (1) WO2002031785A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662342A (en) * 1971-02-16 1972-05-09 Phinizy R B Key-controlled electronic security system
US4494114A (en) * 1983-12-05 1985-01-15 International Electronic Technology Corp. Security arrangement for and method of rendering microprocessor-controlled electronic equipment inoperative after occurrence of disabling event
US5194855A (en) * 1991-04-08 1993-03-16 Mccaslin Max W Security device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3662342A (en) * 1971-02-16 1972-05-09 Phinizy R B Key-controlled electronic security system
US4494114A (en) * 1983-12-05 1985-01-15 International Electronic Technology Corp. Security arrangement for and method of rendering microprocessor-controlled electronic equipment inoperative after occurrence of disabling event
US4494114B1 (en) * 1983-12-05 1996-10-15 Int Electronic Tech Security arrangement for and method of rendering microprocessor-controlled electronic equipment inoperative after occurrence of disabling event
US5194855A (en) * 1991-04-08 1993-03-16 Mccaslin Max W Security device

Also Published As

Publication number Publication date
AU2000278049A1 (en) 2002-04-22

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