WO2006136505A1 - Control and diagnostic unit for electrical tool - Google Patents

Control and diagnostic unit for electrical tool Download PDF

Info

Publication number
WO2006136505A1
WO2006136505A1 PCT/EP2006/063084 EP2006063084W WO2006136505A1 WO 2006136505 A1 WO2006136505 A1 WO 2006136505A1 EP 2006063084 W EP2006063084 W EP 2006063084W WO 2006136505 A1 WO2006136505 A1 WO 2006136505A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
control
diagnostic unit
electrical
electrical current
Prior art date
Application number
PCT/EP2006/063084
Other languages
French (fr)
Inventor
Guido Valentini
Original Assignee
Guido Valentini
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 Guido Valentini filed Critical Guido Valentini
Publication of WO2006136505A1 publication Critical patent/WO2006136505A1/en

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/34—Testing dynamo-electric machines
    • G01R31/343—Testing dynamo-electric machines in operation

Definitions

  • the present invention relates to a control and diagnostic unit for an electrical tool, in particular for a portable electrical tool for machining surfaces.
  • Portable tools for machining surfaces operating under the action of electrical power are known.
  • the aforesaid tools require maintenance operations whose frequency cannot be predicted beforehand but depends instead on the degree of wear of the tool, which in turns depends on the working hours and type of the tool itself.
  • the present invention envisages a control and diagnostic unit for tool provided with electrical motor, which is characterised in that it comprises an electrical current sensor adapted to measure the flow of electrical current fed to the tool motor, an electronic circuit for counting and storing the flow time and/or the quantity of electrical current fed to the tool motor, and at least one indicating device adapted to indicate the instant at which said flow time and/or said quantity of current exceeds a predetermined value indicating the need for maintenance of the tool.
  • figure 1 schematically shows an electrical tool provided with a control and diagnostic unit according to the present invention
  • figure 2 shows again schematically but on a larger scale the aforesaid control and diagnostic unit
  • figure 3 shows a block diagram of said control and diagnostic unit.
  • Figure 1 schematically shows, by way of example only, a portable electrical tool for machining surfaces which is indicated as a whole by the number 1 and comprises a body 2 with a grip 3.
  • control and diagnostic unit 5 To the grip 3 is associated a control and diagnostic unit 5 according to the present invention which, as shown in figure 2, comprises a current sensor 6 adapted to measure the passage of current in the wire 4 and/or the quantity of current required by the tool motor.
  • Unit 5 also comprises a display 7, for example a liquid crystal display, and a plurality (three in the example shown) of light indicators 8, preferably LEDs of different colours, whose objects will be explained above.
  • a display 7 for example a liquid crystal display
  • Unit 5 also comprises within an electronic circuit 9, shown in figure 3, which essentially includes an analogue-digital converter 10, a clock 11 and a microprocessor 12 provided with a non- volatile memory 13, with controls the display 7 and the light indicators 8. There is also provided an interface device 14, for example an infrared optical port or WI-FI device, which allows the unit 5 to dialogue with external units.
  • an electronic circuit 9, shown in figure 3 which essentially includes an analogue-digital converter 10, a clock 11 and a microprocessor 12 provided with a non- volatile memory 13, with controls the display 7 and the light indicators 8.
  • an interface device 14 for example an infrared optical port or WI-FI device, which allows the unit 5 to dialogue with external units.
  • the duration and/or intensity of the electrical current fed to the motor through the wire 4 during the working time of the tool is constantly detected and measured by sensor 6, which communicates the measured data in the form of analogue signal to the converter 10 (fig. 3) which converts it into a digital signal sent to the microprocessor 12 and to the clock 11.
  • the latter is started by the aforesaid digital signal at the beginning of the powering period of the tool and provides counting data to the microprocessor 12, which stores them in the memory 13 along with the current intensity provided to it directly by the digital signal at output from the converter 10.
  • the microprocessor 12 maintains a first light indicator 8 lit, for example green.
  • the microprocessor 12 activates a second light indicator 8, for example yellow.
  • the microprocessor 12 activates instead a third light indicator 8, for example red.
  • Measured data may either be transmitted by the interface device 14 to an external central unit (not shown) or read by it for centralised management of a plurality of tools.
  • control and diagnostic unit according to the invention was devised for a tool of the type with grip, it is evident that the aforesaid unit can be combined to a hand-held type tool.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Drilling And Boring (AREA)

Abstract

To an electrical tool for machining surfaces is associated a control and diagnostic unit comprising an electrical current sensor (6) adapted to measure the flow of electrical current fed to the tool motor, an electronic circuit (9) for counting and storing the flow time and/or the quantity of electrical current fed to the tool motor, and at least one indicating device (8) adapted to indicate the instant at which said flow time and/or said quantity of current exceeds a predetermined value indicating the need for maintenance of the tool. There may be provided an interface device (14) for communicating information to an external central unit.

Description

"Control and diagnostic unit for electrical tool." * * * * *
DESCRIPTION
The present invention relates to a control and diagnostic unit for an electrical tool, in particular for a portable electrical tool for machining surfaces.
Portable tools for machining surfaces operating under the action of electrical power are known.
The aforesaid tools require maintenance operations whose frequency cannot be predicted beforehand but depends instead on the degree of wear of the tool, which in turns depends on the working hours and type of the tool itself.
Evidently, it would be appropriate to have means for automatically verifying the working time and possibly the type of work, and the consequent wear of the tool, so as to plan the proper maintenance operations in time and safely.
It is exactly the main object of the present invention to provide a control and diagnostic unit for electrical tool, which allows to obtain precise indications on the working hours, and possibly the type of work, of the tool and accordingly to provide an indication on the more or less urgent need for maintenance.
According to the aforesaid objects, the present invention envisages a control and diagnostic unit for tool provided with electrical motor, which is characterised in that it comprises an electrical current sensor adapted to measure the flow of electrical current fed to the tool motor, an electronic circuit for counting and storing the flow time and/or the quantity of electrical current fed to the tool motor, and at least one indicating device adapted to indicate the instant at which said flow time and/or said quantity of current exceeds a predetermined value indicating the need for maintenance of the tool. The features of the present invention will be explained in the following detailed description of an embodiment shown by way of non-limitative example in the attached drawings, in which: figure 1 schematically shows an electrical tool provided with a control and diagnostic unit according to the present invention; figure 2 shows again schematically but on a larger scale the aforesaid control and diagnostic unit; figure 3 shows a block diagram of said control and diagnostic unit.
Figure 1 schematically shows, by way of example only, a portable electrical tool for machining surfaces which is indicated as a whole by the number 1 and comprises a body 2 with a grip 3.
Through the grip 3 runs an electrical wire 4, by which, during the working periods of the tool, electrical current is fed for operating the tool motor (not shown).
To the grip 3 is associated a control and diagnostic unit 5 according to the present invention which, as shown in figure 2, comprises a current sensor 6 adapted to measure the passage of current in the wire 4 and/or the quantity of current required by the tool motor.
Unit 5 also comprises a display 7, for example a liquid crystal display, and a plurality (three in the example shown) of light indicators 8, preferably LEDs of different colours, whose objects will be explained above.
Unit 5 also comprises within an electronic circuit 9, shown in figure 3, which essentially includes an analogue-digital converter 10, a clock 11 and a microprocessor 12 provided with a non- volatile memory 13, with controls the display 7 and the light indicators 8. There is also provided an interface device 14, for example an infrared optical port or WI-FI device, which allows the unit 5 to dialogue with external units.
By effect of the described structure, the duration and/or intensity of the electrical current fed to the motor through the wire 4 during the working time of the tool is constantly detected and measured by sensor 6, which communicates the measured data in the form of analogue signal to the converter 10 (fig. 3) which converts it into a digital signal sent to the microprocessor 12 and to the clock 11.
The latter is started by the aforesaid digital signal at the beginning of the powering period of the tool and provides counting data to the microprocessor 12, which stores them in the memory 13 along with the current intensity provided to it directly by the digital signal at output from the converter 10.
During the normal operation of the tool, the microprocessor 12 maintains a first light indicator 8 lit, for example green.
When the count and/or current intensity at a certain time (indicating the degree of fatigue of the tool) reaches a first predetermined value indicating reaching of a foreseeable wear of the tool which may suggest maintenance of the tool itself, the microprocessor 12 activates a second light indicator 8, for example yellow.
When the count and/or current intensity in relation to time exceeds the first value and reaches a second predetermined value indicating a working time and a wear so as to require urgent maintenance intervention, the microprocessor 12 activates instead a third light indicator 8, for example red.
Measured data may either be transmitted by the interface device 14 to an external central unit (not shown) or read by it for centralised management of a plurality of tools.
Although in the example shown in the drawings and described above the control and diagnostic unit according to the invention was devised for a tool of the type with grip, it is evident that the aforesaid unit can be combined to a hand-held type tool.

Claims

- A -CLAIMS
1. A control and diagnostic unit for tool provided with electrical motor, characterised in that it comprises an electrical current sensor (6) adapted to measure the flow of electrical current fed to the tool motor, an electronic circuit (9) for counting and storing the flow time and/or the quantity of electrical current fed to the tool motor, and at least one indicating device (8) adapted to indicate the instant at which said flow time and/or said quantity of current exceeds a predetermined value indicating the need for maintenance of the tool.
2. A control and diagnostic unit according to claim 1, characterised in that said electronic unit (9) includes a microprocessor (12) with memory (13).
3. A control and diagnostic unit according to claim 1, characterised in that it comprises an interlace device (14) for communicating information to an external central unit.
PCT/EP2006/063084 2005-06-21 2006-06-12 Control and diagnostic unit for electrical tool WO2006136505A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2005A001166 2005-06-21
ITMI20051166 ITMI20051166A1 (en) 2005-06-21 2005-06-21 "CONTROL UNIT AND DIAGNOSTIC FOR ELECTRIC TOOL."

Publications (1)

Publication Number Publication Date
WO2006136505A1 true WO2006136505A1 (en) 2006-12-28

Family

ID=36764577

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/063084 WO2006136505A1 (en) 2005-06-21 2006-06-12 Control and diagnostic unit for electrical tool

Country Status (2)

Country Link
IT (1) ITMI20051166A1 (en)
WO (1) WO2006136505A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9665080B2 (en) 2012-03-21 2017-05-30 Husqvarna Ab Method for communicating data between a control system of a power tool and a computing device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4786220A (en) * 1984-06-18 1988-11-22 Borg-Warner Corporation Cutting tool wear monitor
US5921726A (en) * 1996-04-23 1999-07-13 Toshiba Kikai Kabushiki Kaisha Machine tool with worn-detection function for tool
DE10156218A1 (en) * 2001-11-15 2003-06-05 Metabowerke Gmbh Hand-held or semi-static electric tool unit e.g. grinding tool, processes load data to make servicing prediction or prediction of remaining problem-free operating period or to detect fault condition
DE10303005A1 (en) * 2003-01-27 2004-08-05 Hilti Ag Operational data collector for hand held power tool has angle sensor and time related data collector for determining use during guarantee period

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4786220A (en) * 1984-06-18 1988-11-22 Borg-Warner Corporation Cutting tool wear monitor
US5921726A (en) * 1996-04-23 1999-07-13 Toshiba Kikai Kabushiki Kaisha Machine tool with worn-detection function for tool
DE10156218A1 (en) * 2001-11-15 2003-06-05 Metabowerke Gmbh Hand-held or semi-static electric tool unit e.g. grinding tool, processes load data to make servicing prediction or prediction of remaining problem-free operating period or to detect fault condition
DE10303005A1 (en) * 2003-01-27 2004-08-05 Hilti Ag Operational data collector for hand held power tool has angle sensor and time related data collector for determining use during guarantee period

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9665080B2 (en) 2012-03-21 2017-05-30 Husqvarna Ab Method for communicating data between a control system of a power tool and a computing device

Also Published As

Publication number Publication date
ITMI20051166A1 (en) 2006-12-22

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