EP0777244A2 - Un interrupteur à verrou-marche et verrou-arrêt - Google Patents

Un interrupteur à verrou-marche et verrou-arrêt Download PDF

Info

Publication number
EP0777244A2
EP0777244A2 EP96308288A EP96308288A EP0777244A2 EP 0777244 A2 EP0777244 A2 EP 0777244A2 EP 96308288 A EP96308288 A EP 96308288A EP 96308288 A EP96308288 A EP 96308288A EP 0777244 A2 EP0777244 A2 EP 0777244A2
Authority
EP
European Patent Office
Prior art keywords
trigger
locking device
switch
cam
lock
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.)
Granted
Application number
EP96308288A
Other languages
German (de)
English (en)
Other versions
EP0777244B1 (fr
EP0777244A3 (fr
Inventor
Phil Million
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
Publication of EP0777244A2 publication Critical patent/EP0777244A2/fr
Publication of EP0777244A3 publication Critical patent/EP0777244A3/fr
Application granted granted Critical
Publication of EP0777244B1 publication Critical patent/EP0777244B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/04—Cases; Covers
    • H01H13/08—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/20—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch wherein an auxiliary movement thereof, or of an attachment thereto, is necessary before the main movement is possible or effective, e.g. for unlatching, for coupling

Definitions

  • This invention relates to switches, and in particular to a lock-on, lock-off switch for a power tool or the like.
  • a power tool such as a drill
  • a trigger which can be gripped by one or two fingers of a user's hand.
  • a circuit within the body of the drill is completed, thereby resulting in power reaching the motor to drive the drill.
  • Some known power drills include a button on one side of the drill body which, if depressed whilst the drill motor is energised, engage in an aperture in the trigger to hold the trigger in its "on” position.
  • the button is biased into its inactive position and, when the trigger is once again squeezed, the button disengages from the trigger to allow the trigger to be released completely such that the power drill is turned off.
  • a power tool which incorporates a locking device for holding a trigger in an active position, which can be accessed from either side of the tool body such that the tool is both left- and right-handed.
  • the present invention provides a lock-on, lock-off switch for a power tool, comprising a trigger movable in a first plane for completing and breaking a circuit to actuate and deactuate the tool, and a locking device movable in a second plane substantially perpendicular to the first plane between a first position in which the trigger is prevented from completing the circuit and a second position in which the trigger is held completing the circuit.
  • a switch according to the present invention is safer than the known prior art switches because its locking device prevents the trigger from being squeezed until the locking device is released. Hence, the power tool cannot inadvertently be switched on.
  • the locking device is biased into its first position.
  • the switch is automatically locked in its off position.
  • the locking device may be biased by means of a centrally mounted spring into its first position. Any other appropriate arrangement could, alternatively, be used for biasing the locking device into its first position.
  • activation of the trigger preferably results in release of the locking device.
  • the locking device has two second positions, one on either side of the first position.
  • the locking device is not handed, but is suitable for use by both right- and left-handed users.
  • the trigger and the locking device interact by means of a cam and cam follower.
  • the cam is preferably formed on the trigger and the cam follower is formed on the locking device. In theory, however, the arrangement could be reversed.
  • the trigger includes a wall lying in the first plane which abuts the cam follower when the locking device is in first position to prevent completion of the circuit.
  • the cam follower includes a dimple for assisting and retaining the locking device in its first position when the wall abuts the cam follower.
  • the cam may include a lip for holding the cam follower when the locking device is in its second position.
  • the cam follower preferably includes a nib which is held behind the lip of the cam when the locking device is in its second position.
  • the trigger is preferably biased into its inactive position.
  • a power drill 1 comprises a trigger 3 and a locking device 5.
  • the trigger 3 has a front face 7 which accommodates two depressions 7a, 7b for receiving fingers of a user (not shown).
  • a recess 9 is formed for receiving a metal contact plate 11 which, when the trigger 3 is squeezed, completes a circuit within the body of the drill 1 to energise a motor of the drill 1.
  • the trigger 3 includes two side flanges 13 which are received in guide grooves (not shown) in the body of the drill 1 during squeezing of the trigger 3.
  • the flanges 13 could, of course, be replaced by grooves which receive flanges formed on the body of the drill 1 itself.
  • a cam (or cam track) 15 is formed in the top of the trigger 3, as shown clearly in Figure 4 of the drawings.
  • the trigger 3 is arranged to move in a first plane dictated by the flanges 13; the locking device 5 is arranged to move in a second plane substantially perpendicular to the first plane, if the user depresses one of the side buttons 17 which protrude from either side of the housing of the drill as shown in Figure 1.
  • the locking device 5 is biased into its central position, as shown in Figures 3 and 4, by means of a leaf spring (not shown), for example, which is accommodated through the frame 19. Hence, when the drill 1 is switched off and the trigger 3 and locking device 5 are at rest, the arrangement is as shown in Figures 2, 3 and 4.
  • a wall 23 extending from the cam track 15 abuts the cam 21 of the locking device 5 and is centralised by means of a dimple 25 formed therein. Hence, the contact plate is prevented from completing the circuit and the drill 1 is not energised.
  • the cam 21 will simply rest against a side of the wall 23 for as long as the trigger 3 is held squeezed. Once the trigger 3 is released, however, the cam 21 will revert back to its central rest position, such that the switch is locked off once again.

Landscapes

  • Switch Cases, Indication, And Locking (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
EP19960308288 1995-11-28 1996-11-15 Un interrupteur à verrou-marche et verrou-arrêt Expired - Lifetime EP0777244B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9524333.3A GB9524333D0 (en) 1995-11-28 1995-11-28 Lock-on, lock-off switch
GB9524333 1995-11-28

Publications (3)

Publication Number Publication Date
EP0777244A2 true EP0777244A2 (fr) 1997-06-04
EP0777244A3 EP0777244A3 (fr) 2000-05-24
EP0777244B1 EP0777244B1 (fr) 2003-09-24

Family

ID=10784586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19960308288 Expired - Lifetime EP0777244B1 (fr) 1995-11-28 1996-11-15 Un interrupteur à verrou-marche et verrou-arrêt

Country Status (3)

Country Link
EP (1) EP0777244B1 (fr)
DE (1) DE69630097T2 (fr)
GB (1) GB9524333D0 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6091035A (en) * 1998-08-14 2000-07-18 Black & Decker, Inc. Lockout mechanism for power tool
US6340802B1 (en) 1998-08-14 2002-01-22 Black & Decker, Inc. Lockout mechanism for power tool
EP1174892A2 (fr) * 2000-07-17 2002-01-23 Heinrich Kopp AG Dispositif de verrouillage mécanique pour les positions marche et arrêt d'un interrupteur à bouton-poussoir
EP2019399A3 (fr) * 2007-07-24 2009-07-08 Defond Components Limited Mécanisme de déclenchement
US20220196236A1 (en) * 2020-12-17 2022-06-23 Pro-Iroda Industries, Inc. Blowtorch having continuous-flame mode

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN220179248U (zh) * 2023-04-23 2023-12-15 浙江普莱得电器股份有限公司 一种电动工具

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3461556A (en) * 1967-07-10 1969-08-19 Sunbeam Corp Trigger switch for electric appliance
DE8908924U1 (de) * 1989-07-22 1989-09-14 Gardena Kress + Kastner Gmbh, 7900 Ulm Sicherheitsschalteinrichtung für Elektrogeräte, insbesondere elektrisch angetriebene Handarbeitswerkzeuge
DE9320029U1 (de) * 1993-01-30 1994-06-01 Robert Bosch Gmbh, 70469 Stuttgart Elektrohandwerkzeug mit Schaltsperre

Non-Patent Citations (1)

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

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6091035A (en) * 1998-08-14 2000-07-18 Black & Decker, Inc. Lockout mechanism for power tool
US6288350B1 (en) 1998-08-14 2001-09-11 Black & Decker, Inc. Lockout mechanism for power tool
US6340802B1 (en) 1998-08-14 2002-01-22 Black & Decker, Inc. Lockout mechanism for power tool
US6512188B2 (en) 1998-08-14 2003-01-28 Black & Decker, Inc. Lockout mechanism for power tool
US6538218B2 (en) 1998-08-14 2003-03-25 Black & Decker, Inc. Lockout mechanism for power tool
US6861598B2 (en) 1998-08-14 2005-03-01 Black & Decker Inc. Lockout mechanism for power tool
EP1174892A2 (fr) * 2000-07-17 2002-01-23 Heinrich Kopp AG Dispositif de verrouillage mécanique pour les positions marche et arrêt d'un interrupteur à bouton-poussoir
EP1174892A3 (fr) * 2000-07-17 2004-03-03 Heinrich Kopp AG Dispositif de verrouillage mécanique pour les positions marche et arrêt d'un interrupteur à bouton-poussoir
EP2019399A3 (fr) * 2007-07-24 2009-07-08 Defond Components Limited Mécanisme de déclenchement
CN101354972B (zh) * 2007-07-24 2011-03-30 德丰零件有限公司 触发装置
US20220196236A1 (en) * 2020-12-17 2022-06-23 Pro-Iroda Industries, Inc. Blowtorch having continuous-flame mode
US11774092B2 (en) * 2020-12-17 2023-10-03 Pro-Iroda Industries, Inc. Blowtorch having continuous-flame mode

Also Published As

Publication number Publication date
DE69630097D1 (de) 2003-10-30
EP0777244B1 (fr) 2003-09-24
DE69630097T2 (de) 2004-07-08
EP0777244A3 (fr) 2000-05-24
GB9524333D0 (en) 1996-01-31

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