EP3109008B1 - Presse de forage magnétique avec source de puissance alternative - Google Patents

Presse de forage magnétique avec source de puissance alternative Download PDF

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Publication number
EP3109008B1
EP3109008B1 EP15173710.3A EP15173710A EP3109008B1 EP 3109008 B1 EP3109008 B1 EP 3109008B1 EP 15173710 A EP15173710 A EP 15173710A EP 3109008 B1 EP3109008 B1 EP 3109008B1
Authority
EP
European Patent Office
Prior art keywords
electromagnet
converter
battery
power source
controller
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
EP15173710.3A
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German (de)
English (en)
Other versions
EP3109008A1 (fr
Inventor
Daniele C. Brotto
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Priority to EP15173710.3A priority Critical patent/EP3109008B1/fr
Publication of EP3109008A1 publication Critical patent/EP3109008A1/fr
Application granted granted Critical
Publication of EP3109008B1 publication Critical patent/EP3109008B1/fr
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Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
    • B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
    • B25H1/0021—Stands, supports or guiding devices for positioning portable tools or for securing them to the work
    • B25H1/0057—Devices for securing hand tools to the work
    • B25H1/0064—Stands attached to the workpiece
    • B25H1/0071—Stands attached to the workpiece by magnetic means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25H—WORKSHOP EQUIPMENT, e.g. FOR MARKING-OUT WORK; STORAGE MEANS FOR WORKSHOPS
    • B25H1/00—Work benches; Portable stands or supports for positioning portable tools or work to be operated on thereby
    • B25H1/0021—Stands, supports or guiding devices for positioning portable tools or for securing them to the work
    • B25H1/0078—Guiding devices for hand tools

Definitions

  • the present disclosure relates to a power tool and, more particularly, to magnetic drill presses.
  • Magnetic drill presses have bases which are designed to magnetically couple to a planar surface, such as a ferrous beam.
  • a planar surface such as a ferrous beam.
  • the base of the magnetic drill press is placed against a surface which will support the press during operation.
  • an electromagnet disposed in the base of the drill press, magnetically couples the drill press to the surface.
  • a user will in turn initiate the drilling process using the drill press.
  • the electromagnet is deactivated, thereby enabling the user to reposition the drill press for subsequent use.
  • the motor driving the drill press When the motor driving the drill press is de-energized, there can be considerable inertia remaining in the motor. In most instances, the motor is de-energized by the user while the drill press remains magnetically coupled to the support surface. In some instances, the AC power supplying the drill press and the electromagnet is removed unexpectedly, such as a circuit breaker overload or an inadvertent disconnection of the power cord. As a result, the electromagnet becomes de-energized and remaining motor inertia may cause the drill press to move. In these instances, it is common for the drill bits to be broken.
  • EP1967305 discloses a magnetic drill having an electromagnet p0ower by a DC voltage generated from an AC source.
  • US2009/028653 discloses a magnetic drill having permanent magnets.
  • a magnetic drill press is provided with an alternate power supply.
  • the drill comprises: an electric motor for driving a tool accessory; a controller configured to receive an AC input voltage signal and operable to control a drive signal to the electric motor; an electromagnet arranged in a base of the drill housing and powered by a DC voltage, to magnetically couple the base to the surface; a AC/DC converter configured to receive the AC input signal and, independent from the controller and in the presence of the AC input signal, to output the DC voltage to the electromagnet; and an alternate power supply circuit that monitors the DC voltage output by the converter and, in the absence of the DC voltage, provides an alternate DC voltage to the electromagnet.
  • the alternate power source circuit is further defined to include a battery and a detector that monitors the DC voltage output by the converter and electrically couples the battery to the electromagnet in the absence of a DC voltage output from the converter.
  • the detector of the alternate power source circuit may also include a first diode interposed between the converter and the electromagnet and a second diode having a cathode electrically coupled to a node interposed between the first diode and the electromagnet.
  • FIG. 1 illustrates an example magnetic drill press 10.
  • the magnetic drill press 10 generally comprises a motor carriage 12 attached to a rack 14 of a housing 16.
  • An electric motor, along with a drilling mechanism 23, is housed within the motor carriage 12.
  • the electric motor 32 rotatably drives the drilling mechanism 23.
  • the drilling mechanism is a tool bit holder 23 configured to hold an accessary, such as a drill bit. While reference is made throughout this disclosure to a drill press, it is readily understood that concepts described herein are applicable to other types of power tools which may make use of an electromagnetic attachment mechanism.
  • the tool operator moves the tool into engagement with a workpiece by moving the motor carriage 12 vertically up and down (in the orientation illustrated in Figure 1 ) along the rack 14. More specifically, the tool operator may actuate a handle 18, which is interfaced with the rack 14, to move the motor carriage 12 toward and away from the workpiece.
  • the housing 16 also supports multiple switches or buttons for controlling the operation of the tool, including a power on/off button 19 for coupling/decoupling current to the drill 10.
  • FIG. 2 An exemplary embodiment of an operation panel 22 for a magnetic drill press is shown in Figure 2 .
  • the power/magnet on/off button 19 is implemented as a rocker type switch. Power to the tool as a whole is enabled when the switch is placed in a first position and disabled when the switch is placed in a second position.
  • power is also supplied to the electromagnet 28 when the switch is in the first position and not supplied to the electromagnet 28 when the switch is in the second position
  • Two interlinked push buttons i.e., motor "off” button 25 and motor “on” button 26
  • the operation panel 22 may include other indicators of tool operation, for example an overload indicator 27. Other configurations for the operation panel 22 as well as other types of user interfaces for controlling the drill press are contemplated by this disclosure.
  • the drill press 10 is further configured with a base 24 to secure the drill press 10 to a work surface.
  • the base 24 houses an electromagnet 28.
  • the electromagnet 28 When the drill press is placed onto a work surface, the electromagnet 28 is positioned proximate thereto. In response to an energizing signal, the electromagnet 28 magnetically couples the base 28 of the drill press to the work surface.
  • the drill press 10 uses a DC electromagnet although use of the more traditional AC electromagnet is also contemplated by this disclosure.
  • FIG. 3 illustrates some of the internal components of the drill press 10.
  • the drill press 10 includes an electric motor 32, a controller 33, an AC/DC converter 34, and an electromagnet 28.
  • the drill press also includes an alternate power source 36. It is to be understood that only the relevant components of the drill press 10 are discussed in relation to Figure 3 , but that other components may be needed to manage and control the overall operation of the system.
  • the controller 33 controls the overall operation and function of the drill press 10. For example, the controller 33 outputs the drive signal to the electric motor 32.
  • the controller 33 is configured to receive an AC input voltage signal from an AC power source.
  • the AC input voltage signal may pass through a rectifier before serving as an input to the controller 33.
  • the primary power source for the drill may be a DC power source, such as a battery.
  • controller may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a combinational logic circuit, a field programmable gate array (FPGA), a processor (shared, dedicated, or group) that executes code, a microcontroller or other suitable components that provide the described functionality.
  • ASIC Application Specific Integrated Circuit
  • FPGA field programmable gate array
  • processor shared, dedicated, or group
  • the AC/DC converter 34 excites the electromagnet. That is, the AC/DC converter 34 receives the AC input voltage signal and operates, in the presence of the AC input voltage signal, to convert the AC input voltage signal to a DC voltage. The DC voltage is in turn output to the electromagnet 28. As noted above, the electromagnet 28 magnetically couples the drill press base to a metal surface in response to the applied DC voltage. To reposition the drill press, the tool operator turns off the electric motor (by depressing "off" button 25) and then powers down the tool (by placing switch 19 in the first position) which in turn deactivates the electromagnet.
  • the alternate power source 36 is configured to supply an energizing signal to the electromagnet 28.
  • the alternate power supply 36 includes a detector 37 and a battery 38.
  • the detector 37 monitors the DC voltage output by the converter 34 and, in the absence of a DC voltage output from the converter 34, electrically couples the battery 38 to the electromagnet 28.
  • the battery 38 may be non-chargeable or rechargeable having a chemistry, such as lithium, NiCd, NiMH, lead acid or the like. It is readily understood that other types of electrical power sources, such as super capacitors, may be used in place of the battery 38.
  • the detector 37 can monitor the presence of AC input signal directly at the input to the AC/DC converter 34 or indirectly by sensing the characteristic of the current consumed during operation of the electromagnet or the electromagnetic field generated by the electromagnet.
  • the battery 38 may be rechargeable.
  • the drill press 10 may be further configured with a charging circuit 35.
  • the charging circuit 35 receives either an AC or DC input signal and operates to maintain the charge of the battery 38. In this way, the alternate power source remains ready for use when called upon.
  • the controller 33 and/or detector 37 can monitor health of the battery 38 and provide replacement information to the tool operator. For example, the controller can monitor the duration of time since the battery was installed and provide a notification to replace the battery when the duration exceeds a predefined limit. In another example, the controller can track the number of occurrences (or amount of time) when the battery 38 is used to energize the magnet and provide a notification to replace the battery when the number of occurrences or amount of time exceeds a predefined threshold. Similarly, notifications may be triggered when the columb-life or some other attribute indicative of battery "health" (e.g., low voltage) exceeds a predefined threshold. The notifications may take various forms including visual indicator, audible indicator, message on a display of the drill, text message sent to designated mobile phone, etc.
  • FIG. 4 illustrates an exemplary operational sequence to implement the system described above.
  • the controller 33 determines if the power/magnet switch 19 is in the "on” position. If the power/magnet switch 19 is not in the “on” position the controller 33 continues to monitor the switch 19 until it is in the "on” position. When the switch 19 is in the "on” position then in step 42 the controller 33 determines if the primary power source (AC input voltage in this example) is present. If the primary power source is not present then the controller simply continues to monitor the AC input until the primary power source is present. If the primary power source is present and if the switch 19 is in the "on” position, an AC input signal will be present at the AC/DC converter 34 and then in step 43 the electromagnet 28 is energized by the primary power source.
  • the primary power source AC input voltage in this example
  • the drill determines at step 44 if the motor "on” button 26 is depressed. If the motor "on” button 26 is depressed then at step 45, the controller 33 provides power to the electric motor 32. If the motor "off” button is depressed, then the controller continues to monitor the motor “on” button 26 until it is depressed.
  • the controller 33 continues to monitor the power/magnet switch 19, the motor on/off buttons 25, 26 and the presence of the primary power source. If the alternate power source 36 determines in step 46 - by the absence of the DC voltage from the converter 34 - that the primary power source is not present then in step 50 the electromagnet 28 is energized by the alternate power source 36. At step 52 the removal of the primary power source will remove power from the electric motor 32 thereby turning the electric motor 32 off. The electric motor 32 will coast to a stop but will still carry momentum which would tend to move the drill in an unsafe manner if the electromagnet 28 didn't maintain its attachment to the work surface. Steps 50 and 52 should occur at virtually the same time.
  • the drill press 10 may generate an alert at 53 when the alternate power supply energizes the electromagnet 28.
  • the detector 37 may also electrically couple the battery 38 to an LED or another type of visual indicator.
  • the detector 37 may electrically couple the battery to an audible alarm.
  • the detector 37 may be configured to broadcast an alert, for example using a RF transmission, to a supervising device. Other types of alarms fall within the scope of this disclosure.
  • the electromagnet remains energized until an input is received from the tool operator.
  • the power/magnet switch 19 is toggle to an off position or some other sequence of switch inputs.
  • the electromagnet 28 remains energized for a predefined period of time (e.g., 30 seconds or one minute).
  • the electromagnet 28 is de-energized in response to a specified trigger condition as indicated at 55.
  • Other types of triggers for de-energizing the electromagnet 28 are also contemplated by this disclosure.
  • step 46 the primary power source is present then in step 47 the controller 33 determines if the power/magnet switch 19 is in the "on” position while the motor "on” button is still depressed. If the power/magnet switch 19 is “off” while the motor “on” button is depressed then the alternate power supply 36 determines - by the absence of the DC voltage from the converter 34 - that the primary power source is not present while the electric motor 32 is still running and so in step 50 the electromagnet 28 is energized by the alternate power source 36. At step 52 the removal of the primary power source will remove power from the electric motor 32 thereby turning the electric motor 32 off. The electric motor 32 will coast to a stop but will still carry momentum which would tend to move the drill in an unsafe manner if the electromagnet 28 didn't maintain its attachment to the work surface. Again, steps 50 and 52 should occur at virtually the same time.
  • the controller 33 terminates power to the electric motor 32.
  • the electric motor 32 is not powered on when the on/off switch is actuated to the on position with the motor on button depressed, thereby preventing an inadvertent startup of the drill. Rather, the tool operator may be required to depress the motor "off” button 25 and then depress the motor "on” button 26 in order to power on the electric motor 32. This feature is commonly referred to as no-volt activation.
  • FIG. 5 further illustrates an example circuit implementation for the alternate power source 36'.
  • the power/magnet on/off switch 19 is placed in the circuit path between the AC/DC converter 34 and the electromagnet 28.
  • a first diode 57 is then interposed between the AC/DC converter 34 and the on/off switch 19. Placement of the on/off switch 19 in the circuit path may vary so long as it remains in series with the converter 34.
  • the switch 19 may be implemented as a double pole, single throw switch, where the other pole couples the AC power source to the controller 33.
  • the on/off switch 19 When the on/off switch 19 is closed, the first diode 57 is forward biased on and current flows into the electromagnet 28.
  • a second diode 58 serves as a detector that monitors the DC voltage output by the converter 34.
  • the second diode 58 is electrically coupled to a node interposed between the first diode 57 and the on/off switch 19.
  • the first diode 57 is forward biased; whereas, the second diode 44 is reverse biased.
  • the DC voltage output by the AC/DC converter 34 is interrupted (i.e., absent)
  • the first diode 57 is reverse biased and the second diode 58 is forward biased. That is, current flows from the battery 38 via the second diode 58 to the electromagnet 28.
  • the electromagnet 28 remains active through the use of a passive component monitoring circuit when the AC power supply to the drill press is interrupted. Because of the placement of the on/off switch 19, it is noted that the alternate power source 36' operates to supply power to the electromagnet only when the drill press has been powered on using the on/off switch 19. Other implementations for the alternate power source are also contemplated within the broader aspects of this disclosure.
  • FIG. 6 illustrates an alternative arrangement of components for the drill press.
  • the controller 33 is interposed between an AC/DC converter 34 and the electromagnet 28.
  • the AC/DC converter 34 receives the AC input signal and in turn powers the controller 33.
  • the controller 33 delivers the energizing signal to the electromagnet 28, for example when the tool is powered on.
  • the alternate power supply 36" monitors the energizing signal to the electromagnet 28 from the controller 33 and in the absence thereof provides an alternate DC voltage to the electromagnet 28. This arrangement otherwise operates in the manner as set forth above.
  • Figure 7 illustrates another alternative arrangement of components for the drill press.
  • the controller 33 monitors the presence and integrity of the AC input signal and controls one of two switches: first switch 71 or second switch 72.
  • the controller 33 may monitor the presence AC input signal directly or indirectly by sensing the characteristic of the current consumed during operation of the electromagnet or the electromagnetic field generated by the electromagnet.
  • First switch 71 is interposed between the AC/DC converter 34 and the electromagnet 28; whereas, second switch 72 is interposed between the alternate power source 36'" and the electromagnet 28.
  • first switch 71 When the controller 33 detects the presence of the AC input signal, first switch 71 is closed and second switch 72 is opened, thereby supplying the energizing signal from the AC/DC converter 34 to the electromagnet 28.
  • the controller 33 opens first switch 71 and closes second switch 72, thereby supplying the energizing signal from the alternate power supply 36'" to the electromagnet 28. In this way, the controller 33 actively controls the energizing of the electromagnet. This arrangement otherwise operates in the manner as set forth above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling And Boring (AREA)

Claims (6)

  1. Foret magnétique comprenant :
    un boîtier (16) avec une base configurée pour se fixer à une surface ;
    un moteur électrique (32) pour entraîner un outil ;
    un dispositif de commande (33) configuré pour recevoir un signal d'entrée CA (19) et qui est à même de commander un signal d'entraînement au moteur électrique (32) ;
    un électroaimant (28) agencé dans la base du boîtier (16) et alimenté par une tension CC afin de coupler magnétiquement la base à la surface ;
    un onduleur (34) configuré pour recevoir le signal d'entrée CA (19) et, indépendamment du dispositif de commande (33) et en présence du signal d'entrée CA (R), délivrer la tension CC à l'électroaimant (28) ;
    un circuit source d'alimentation alternée qui surveille la tension CC délivrée par l'onduleur (34) et, en l'absence de la tension CC, fournit une tension CC alternée à l'électroaimant (28) ;
    caractérisé en ce que le circuit source de courant alterné comprend une batterie (38) et un détecteur (37) qui surveille la tension CC délivrée par l'onduleur (34) et couple électriquement la batterie (38) à l'électroaimant (28) en l'absence d'une tension CC délivrée par l'onduleur (34).
  2. Foret magnétique selon la revendication 1, comprenant en outre un commutateur (25, 26) pour brancher et débrancher le moteur (32), dans lequel le commutateur (25, 26) a au moins deux bornes placées en série avec l'onduleur (34).
  3. Foret magnétique selon la revendication 2, qui comprend en outre une première diode (57) intercalée entre l'onduleur (34) et l'électroaimant (28).
  4. Foret magnétique selon la revendication 4, qui comprend en outre un circuit de chargement configuré pour recevoir le signal d'entrée CA et maintenir la charge de la batterie.
  5. Foret magnétique selon l'une quelconque des revendications précédentes, dans lequel le détecteur (37) génère une alerte perceptible à l'utilisateur lorsque la batterie (38) est couplée électriquement à l'électroaimant (28).
  6. Foret magnétique selon l'une quelconque des revendications précédentes, dans lequel le dispositif de commande (33) est configuré pour surveiller la batterie (38) et générer une notification de remplacement de la batterie (38) sur la base de l'état de la batterie (38).
EP15173710.3A 2015-06-24 2015-06-24 Presse de forage magnétique avec source de puissance alternative Active EP3109008B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15173710.3A EP3109008B1 (fr) 2015-06-24 2015-06-24 Presse de forage magnétique avec source de puissance alternative

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP15173710.3A EP3109008B1 (fr) 2015-06-24 2015-06-24 Presse de forage magnétique avec source de puissance alternative

Publications (2)

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EP3109008A1 EP3109008A1 (fr) 2016-12-28
EP3109008B1 true EP3109008B1 (fr) 2018-08-15

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11845178B2 (en) 2020-11-03 2023-12-19 Techtronic Cordless Gp Modular work station

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112020002302T5 (de) * 2019-05-09 2022-02-17 Magna Closures Inc. Reserve-energieversorgung und authentifizierung für elektronische verriegelung

Family Cites Families (5)

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Publication number Priority date Publication date Assignee Title
JP2510451Y2 (ja) * 1990-01-26 1996-09-11 日東工器 株式会社 電磁石ベ―ス付ドリル装置
JP3027538B2 (ja) * 1996-05-28 2000-04-04 日東工器株式会社 穿孔機制御装置
US7936142B2 (en) * 2005-12-26 2011-05-03 Nitto Kohki Co., Ltd. Portable drilling device
JP4787768B2 (ja) * 2007-02-05 2011-10-05 日東工器株式会社 ドリル装置
US8376667B2 (en) * 2007-07-27 2013-02-19 Milwaukee Electric Tool Corporation AC/DC magnetic drill press

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11845178B2 (en) 2020-11-03 2023-12-19 Techtronic Cordless Gp Modular work station

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