US3755640A - Reversing switch for a power tool with separate selectively movable contact carriers - Google Patents

Reversing switch for a power tool with separate selectively movable contact carriers Download PDF

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Publication number
US3755640A
US3755640A US00275701A US3755640DA US3755640A US 3755640 A US3755640 A US 3755640A US 00275701 A US00275701 A US 00275701A US 3755640D A US3755640D A US 3755640DA US 3755640 A US3755640 A US 3755640A
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United States
Prior art keywords
contact
engagement
common contact
movement
trigger
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Expired - Lifetime
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US00275701A
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English (en)
Inventor
F Kaman
C Robertson
I Supel
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SKIE CORP
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SKIE CORP
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/06—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner
    • H01H9/063—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner enclosing a reversing switch

Definitions

  • a pair of contact strips is arranged for respective connection to the sides of a motor armature which is wound for rotation in both directions.
  • a pair of movable contacts is mounted by a respective pair of contact carriers for slidable engagement with the contact strips.
  • a reversing arm actuates a shuttle for connecting a selected one of the contact carriers for movement by the trigger from an off position wherein the associated movable contact is in engagement with the first common contact and out of engagement with the second common contact to an on position wherein said movable contact is in engagement with the second common contact and out of engagement with the first common contact.
  • the present invention relates to a switch unit or device adapted for mounting in the housing of aportable tool, such as an electric drill, for control of the tool motor in response to movement of a trigger which forms a part of the switch unit.
  • the present invention relates to such a switch unit having a contact arrangement for reversing the direction of current flow through the armature windings thereby to energize the associated tool in both forward and reverse directions.
  • the present invention relates to a reversing switch for a portable tool or the like, which switch embodies a unique arrangement of reversible contacts, which contacts permit integrating of the reversing switch with a speed control circuit.
  • a primary object of the present invention is the provision of a new and improved reversing switch which is simple to construct and which is highly reliable in operation.
  • Another object of the present invention is the provision of a reversing switch which may be readily integrated with a speed control circuit for an electric motor of a power tool.
  • Still another object of the present invention is the provision of the reversing switch of the type described which includes first and second common contacts, a pair of movable contacts and respective carriers therefor, whereby a selected one of the contact carriers may be connected with the trigger for movement of the associated movable contact from an off" position wherein said movable contact is in engagement with the first common contact and out of engagement with the second contact to an on position wherein said movable contact is in engagement with said second common contact and out of engagement with said first common contact.
  • FIG. I is a side elevational view of the switch unit or device embodying the present invention.
  • FIG. 2 is a top plan view of the switch device
  • FIG. 3 is an enlarged section taken along the line 33 of FIG. 2;
  • FIG. 4 is a front elevation of the switch device
  • FIG. 5 is a fragmentary exploded isometric, largely diagrammatic in form', primarily showing the arrangement of the contacts and the carriers for the movable contacts;
  • FIG. 6 is a circuit diagram, largely schematic in form, showing the reversing switch in the off" position
  • FIG. 7 is a circuit diagram, largely schematic in form, showing the reversing switch energizing the tool motor in one direction of rotation thereof through an associated speed control circuit;
  • FIG. 8 is a circuit diagram, largely schematic in form, showing the reversing switch energizing the tool motor in its other direction of rotation and with the speed control circuit being bypassed.
  • the present invention is embodied in a switch unit or device, generally designated 10, which device includes a housing 1 1, generally in the fonn of a parallelepiped, mounting a trigger 12, a reversing arm 14 and a locking plunger 15.
  • the switch unit 10 is adapted for mounting withinthe housing of a portable electric tool, such as an electric drill, which tool housing includes suitable apertures for exposing the trigger 12, the reversing arm 14 and the plunger 15 for manipulation by the operator of the tool.
  • the associated portable tool includes a motor having an armature wound for rotation in both directions, which directions will be referred to as forward" and reverse.”
  • the trigger l2 and reversing arm 14 are preferably juxtaposed for convenient operation as disclosed and claimed in Frenzel US. Pat. No. 3,260,827, assigned to the assignee of the present application.
  • the housing 11 includes a top wall 17, side walls 18, a front wall 19 and a rear wall 20, the housing being open at the bottom thereof for reception of a housing subassembly, generally designated 22.
  • the front wall 19 includes an aperture 23 for receiving the trigger 12.
  • the trigger is suitably mounted, as by guideways or the like, for reciprocal movement relative to the housing.
  • the trigger 12 may include adjustment mechanism as disclosed and claimed in Frenzel Reissue US. Pat. No. Re. 26,781, assigned to the assignee of the present application,
  • the opening 23 in the front housing wall 19 also receives the reversing arm 14.
  • This arm includes a blind bore 26 on its underside and intermediate its ends for receiving a pin 27 formed on a member 28, the latter being a part of the housing 11. It will be apparent the reversing arm 14 is mounted for pivoting or swinging movement in a horizontal plane about an axis defined by the pin 27.
  • the reversing arm 14 preferably includes a pin 29 to prevent movement of the reversing arm unless the trigger is in its extended position, all as fully described in the aforesaid Frenzel U.S. Pat. No. 3,260,827.
  • the trigger 12 includes a cavity 30 in the underside thereof for receiving a pair of contact carriers 31, 32.
  • the trigger 12 also includes a rearwardly extending tongue portion 34 having a transversely extending opening 35, the walls of which are stepped to form slideways 36.
  • a shuttle 37 is slidably mounted in the opening 35, which shuttle has shoulders 38 in sliding engagement with the slideways 36.
  • the shuttle 37 'includes an upwardly extending pin 40 received within a cutout 41 in the inner end of the reversing arm 14. It should be apparent that swinging movement of the reversing arm will result in sliding movement of the shuttle from one end of the opening 35 to the other end thereof.
  • the contact carrier 31 includes a pocket 43 opening at the top of the contact carrier and at one side thereof.
  • the contact carrier 32 which is of identical but opposite hand construction with the carrier 31, includes a pocket 44. These pockets are adapted for alternately receiving the depending portion 45 of the shuttle 37 and for permitting sliding movement of the shuttle fron one pocket to the other when the contact carriers are in side-by-side alignment as shown in FIG. 5.
  • the contact carrier 31 is connected with the trigger 12 for movement in unison with the latter, the contact carrier 32 at such time being disconnected from the trigger.
  • the contact carrier 32 When the shuttle 37 is received within the pocket 44, the contact carrier 32 is connected with the trigger l2 and the contact carrier 31 disconnected from the trigger.
  • a coil spring 47 has one end thereof received within an opening 48 formed in the contact carrier 31, the other end of this spring being in abutting engagement with the inside surface of the rear housing wall 20.
  • Another spring 49 abuts the rear housing wall 29 and is also received within an opening (not shown) in the contact carrier 32. The springs 47, 49 urge the contact carriers to the right as seen in FIG. 3.
  • the contact carrier 31 includes a longitudinally extending slot 51 for reception of a bridging contact 52, which bridging contact includes an upstanding ear 52a and contact faces 52b, 520.
  • the carrier 31 includes a pocket for receiving the ear 52a.
  • a coil spring 53 has its upper end received within a blind bore 54 formed in the contact carrier 31, the lower end of this spring bearing downwardly against the bridging contact 52 for urging the same into engagement with fixed contacts to be described hereinbelow.
  • the contact carrier 32 includes a slot 56 for reception of a bridging contact 57, the latter being urged downwardly by a coil spring 58.
  • the bridging contact 57 which is identical with the bridging contact 52, includes an upstanding ear 57a and contact faces 57b, 57c.
  • the subassembly 22 is generally in the form of a parallelepiped having its top defined by a dielectric contact mounting board 60.
  • the board 60 mounts a common contact 61 including contact formations 61a, 61b as well as a depending terminal 61c.
  • the contact board 60 also mounts a pair of parallel spaced contact strips 62, 63 having respective depending terminals 62a, 63a.
  • a common contact bar 65 is mounted on the board 60 in perpendicular spaced relationship with the strips 62, 63.
  • the board 60 mounts another common contact bar 66 having a depending terminal portion 660.
  • the subassembly 22 includes a contact 68 having a first terminal 68a and a second terminal 68b.
  • This contact serves only as a convenient means for making the connection between the field windings of the motor and the source of alternating current; the contact 68 serves no function as far as the switching operation is concerned.
  • the six contact terminals 610, 62a, 63a, 66a, 68a and 68b are in the form of push-in terminals and are received in respective cavities opening at the base of the subassembly 22 thereby to facilitate connection with the various lead wires.
  • the subassembly 22 includes a compartment (not shown) for reception of a vertically disposed ceramic circuit board, generally designated 70 (FIG. 4).
  • a vertically disposed ceramic circuit board generally designated 70 (FIG. 4).
  • this circuit board which is of the type disclosed and claimed in Robertson U.S. Pat. No. 3,543,120, mounts the various electronic components constituting a speed control circuit of the type disclosed and claimed in Gawron U.S. Pat. No. 3,209,228, each of these patents being assigned to the assignee of the present invention.
  • the contact board 60 includes an elongated slot 71 for receiving the upper portion of the circuit board 70, which upper portion mounts resistance strips forming part of the variable resistor of the speed control circuit, as fully explained in the aforesaid Robertson patent.
  • the circuit board 70 includes a pair of colinear resistance strips 72, 73 adapted to be slidably engaged by the contact slider 74. It will be understood that the trigger 12 includes a cavity for receiving the slider 74 thereby to impart sliding movement to the latter along the resistance strips 72, 73 in response to reciprocal movement of the trigger.
  • the circuit board 70 further includes a controllable semiconductor 76, which may be a silicon controlled rectifier, for example.
  • the board 70 mounts a capacitor 77 and a suitable triggering device 78.
  • the circuit board 70 includes a pair of contact strips 80 and 81 which are bent over horizontally and connected to the respective contact bars 65, 66, as by soldering. Reference should be had to the aforementioned Robertson and Gawron patents for a detailed description of the speed control circuit.
  • the contact strip terminals 620 and 63a are respectively connected to the sides of an armature 82, which armature is wound for rotation in both forward and reverse directions.
  • the field windings 83 of the motor are connected to the terminal 660 of the contact bar 66 and to the terminal 68a of the contact 68.
  • the two lines 84, 85 from the source of alternating current are respectively connected to the terminals 61c and 68b.
  • the switch unit is shown in the off position in FIG. 3.
  • the contact face 52b is engaged with the contact strip 62 and the ear 52a is in engagement with the contact formations 61a.
  • the contact face 520 is out of engagement with the contacts on the board 60.
  • the contact face 57b is in engagement with the contact strip 63
  • the ear 57a is in engagement with the contact formation 61b
  • the contact face 57c is out of engagement with the contacts on the board 60.
  • the arrangement of the contacts as just described is schematically represented in FIG. 7.
  • the circuit through the motor is as follows: terminal 61c, contact formation 61b, contact ear 57a, contact strip 63, terminal 63a, armature 82, terminal 62a, contact strip 62, contact faces 52b, 52c, bar 65, contact strip 80, the speed control circuit on the ceramic circuit board 70, contact strip 81, bar 66, terminal 66a, field windings 83, and contact 68.
  • the motor is energized in the forward direction and at a speed proportional to the amount the trigger is depressed.
  • the contact faces 52b, 52c slide along the respective contacts 62, 65.
  • Such movement of the trigger causes corresponding movement of the slider 74 along the resistance strips 72, 73 progressively increasing the speed of the motor as more fully explained in the aforementioned Robertson and Gawron patents.
  • the motor will again be energized in the forward direction through the speed control circuit from the high speed mode of operation and to low speed as the trigger is progressively extended.
  • the bridging contact 52 will be rocked to the position shown in FIG. 3 thereby again establishing the 0H position as seen in FIG. 6.
  • the circuit through the armature is as follows: terminal 61c, contact formation 61a, contact ear 52a, contact face 52b, contact strip 62, terminal 62a, armature 82,
  • FIG. 8 illustrates the arrangement of contacts when the reversing arm 14 is in the reverse position and when the trigger is fully depressed. It will be apparent that in such position of the reversing arm and trigger, the motor will be energized in the reverse direction of rotation at full speed independently of the speed control circuit.
  • the present invention provides a new and improved arrangement of contacts for reversing the direction of rotation of an electric motor.
  • the present invention has particular applicability in a reversing switch of the trigger actuated type adapted for mounting within the housing of a portable electric tool.
  • the arrangement of contacts according to the present invention may be readily integrated with a contact arrangement forming part of a speed control circuit of the type which includes a variable resistor for varying the speed of the motor in response to the amount of trigger movement.
  • the present invention is not to be limited for use in association with a speed control circuit.
  • a reversing switch for an electric motor comprising:
  • first common contact means arranged for connec tion to one of the two lines of an electric power source
  • first actuator means for moving a selected one of said contact carriers from an off position wherein the associated movable contact is in engagement with said first common contact means and out of engagement with said second common contact means to an "on" position wherein said movable contact is in engagement with said second common contact means and out of engagement with said first common contact means;
  • second actuator means for alternately connecting one or the other of said contact carriers for movement byjsaid first actuator means.
  • the reversing switch according to claim 2 further defined by:
  • the reversing switch according to claim 3 further defined by third common contact means connected with said speed control circuit and arranged for connection within the field windings of said motor, said first actuator means being adapted to move a selected one of said contact carriers from said on position to a bypass position wherein the associated movable contact is in engagement with said third common contact means and out of engagement with said first and second common contact means.
  • a reversing switch for a portable tool of the type powered by an electric motor of the reversible type comprising:
  • a switch housing adapted for mounting within the housing of a power tool
  • a trigger and a reversing member mounted by said housing for independent movement relative thereto;
  • first common contact means mounted in said housing and connected with a first terminal arranged for connection to one of the two lines of an electric power source;
  • second common contact means mounted in said housing and connected with a second terminal arranged for connection to the field windings of said motor
  • said housing containing a pair of movable contacts and a pair of respective carriers therefor;
  • first means in said housing respectively connecting said movable contacts to third and fourth terminals which third and fourth terminals are arranged for connection to the respective sides ofa motor armature of the type wound for rotation in both directions;
  • second means in said housing movable, in response to movement of said reversing member back and forth between forward and reverse positions, for connecting a selected one of said contact carriers with said trigger for movement of the former, in response to movement of the latter, from an of position wherein the associated movable contact is in engagement with said first common contact means and out of engagement with said second common contact means to an on" position wherein said movable contact is in engagement with said second common contact means and out of engagement with said first common contact means.
  • a. means in said housing defining a speed control circuit of the type including a variable resistor, which circuit is connected between said second common contact means and said second terminal;
  • said first means including a pair of contact strips extending in parallel spaced relation with each other and also being parallel with the direction of trigger movement, which strips are respectively slidably engaged by said movable contacts;
  • said second means including a shuttle engaged with said reversing member and movably mounted by said trigger, said shuttle being alternately received in said pockets for establishing the connection between said trigger and the selected one of said contact carriers.
  • the reversing switch according to claim 9 further defined by, means defining a speed control circuit of the type including a variable resistor, which circuit is connected between said second common contact means and said second terminal;

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  • Mechanisms For Operating Contacts (AREA)
  • Motor And Converter Starters (AREA)
  • Mechanical Control Devices (AREA)
  • Adjustable Resistors (AREA)
  • Switches With Compound Operations (AREA)
  • Manipulator (AREA)
  • Push-Button Switches (AREA)
US00275701A 1972-07-27 1972-07-27 Reversing switch for a power tool with separate selectively movable contact carriers Expired - Lifetime US3755640A (en)

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US27570172A 1972-07-27 1972-07-27

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US (1) US3755640A (es)
JP (1) JPS4958320A (es)
CA (1) CA973604A (es)
CH (1) CH584481A5 (es)
DE (1) DE2333508A1 (es)
ES (1) ES415400A1 (es)
FR (1) FR2195111B1 (es)
GB (1) GB1440807A (es)
IT (1) IT986166B (es)
NL (1) NL7309471A (es)

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2629722A1 (de) * 1976-07-02 1978-01-12 Scintilla Ag Handbetaetigbare einbauschaltvorrichtung
JPS54131978U (es) * 1978-03-06 1979-09-12
JPS54131979U (es) * 1978-03-06 1979-09-12
US4180716A (en) * 1977-11-15 1979-12-25 Fujisoku Electric Co., Ltd. Switch having lock-off and lock-on
US4204580A (en) * 1978-08-03 1980-05-27 The Singer Company Forward biased switch for a reversible hammer drill
US4277661A (en) * 1978-09-07 1981-07-07 J. & J. Marquardt Basic electric switch with an additional switch portion
EP0033409A2 (en) * 1980-02-04 1981-08-12 Lucerne Products, Inc. Trigger operated tool handle switch
EP0048124A2 (en) * 1980-09-12 1982-03-24 Skil Nederland B.V. Speed control switch device
US4337425A (en) * 1980-06-02 1982-06-29 Eaton Corporation Speed control trigger switch
JPS57115125U (es) * 1981-01-09 1982-07-16
WO1983002358A1 (en) * 1981-12-28 1983-07-07 Lucerne Products Inc Trigger operated tool handle switch
US4505170A (en) * 1982-09-30 1985-03-19 Laere Christiaan G M Hand-holdable electric power tool apparatus
US4553005A (en) * 1984-03-08 1985-11-12 Eaton Corporation Trigger operated electric switch
US4572997A (en) * 1984-10-09 1986-02-25 Fujisoku Electric Co., Ltd. Trigger switch
US4587384A (en) * 1984-07-12 1986-05-06 Black & Decker, Inc. Sub-assembly for electric motor including reversing switch
US4675540A (en) * 1985-02-15 1987-06-23 Ranco Electronics Division Toggle electrical switch
US4734547A (en) * 1985-08-05 1988-03-29 Fujisoku Electric Co., Ltd. Reversing speed control switch
US4822958A (en) * 1982-09-30 1989-04-18 Laere Christiaan G M Electric rotary power tool apparatus holdable by hand during operation, kit comprising the same; and novel switch means therefor
US4864083A (en) * 1988-04-15 1989-09-05 Lucerne Products, Inc. Reversing switch
EP0374959A2 (en) * 1988-12-23 1990-06-27 OMRON Corporation Switch mechanism for an electric power tool
US4968922A (en) * 1988-04-15 1990-11-06 Lucerne Products, Inc. Reversing switch
EP0444907A2 (en) * 1990-03-01 1991-09-04 Black & Decker Inc. Switch
US5223770A (en) * 1991-04-04 1993-06-29 Andreas Stihl Portable handheld work apparatus having an electric drive motor
US6469268B1 (en) * 1998-07-24 2002-10-22 Marquardt Gmbh Electrical switch
US6664490B2 (en) * 2001-11-27 2003-12-16 Satori-S-Tech Co., Ltd. Switching mechanism and electric switch using the same
US20060186102A1 (en) * 2005-02-09 2006-08-24 Isao Inagaki Trigger switch
US7476821B1 (en) * 2007-07-24 2009-01-13 Defond Components Limited Trigger mechanism
US20120000755A1 (en) * 2009-03-02 2012-01-05 Makita Corporation Electric tool
CN101699593B (zh) * 2006-01-27 2012-06-13 上海拜骋电器有限公司 开关组件
CN101527207B (zh) * 2008-02-25 2012-06-20 佐鸟控制科技有限公司 电动工具用开关
US8493172B2 (en) 2011-09-30 2013-07-23 Snap-On Incorporated Variable speed toggle trigger
US20150282337A1 (en) * 2014-03-28 2015-10-01 Black & Decker Inc. Variable-speed actuator for a power tool
US12059792B2 (en) 2019-08-16 2024-08-13 Milwaukee Electric Tool Corporation Mode selection of a power tool

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3144350C2 (de) * 1981-11-07 1986-07-17 Felo-Werkzeugfabrik Holland-Letz GmbH, 3577 Neustadt Schaltungsanordnung zur elektronischen Drehzahleinstellung eines Elektromotors für einen Handbohrer oder Handschrauber
DE3153215C2 (de) * 1981-11-07 1987-04-16 Felo Holland-Letz GmbH & Co KG, 3577 Neustadt Schalter für einen elektromotorisch angetriebenen Handschrauber oder Handbohrer mit Drehrichtungsumkehr und einstellbarer Drehzahl
IT1210852B (it) * 1982-02-10 1989-09-29 Star Utensili Elett Commutatore perfezionato perl'inversione di marcia di un motore per utensili elettrici portatili.
US4523116A (en) * 1983-03-31 1985-06-11 Black & Decker, Inc. Electrical connection system for motors
JPH01235112A (ja) * 1988-03-15 1989-09-20 Satori Switch Kogyo Kk スイッチ
DE3815883A1 (de) * 1988-05-10 1989-11-23 Kautt & Bux Kg Geraeteschalter

Citations (4)

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US3594523A (en) * 1969-05-08 1971-07-20 Skil Corp Electric switch with bridging contact
US3603757A (en) * 1969-09-18 1971-09-07 Lucerne Products Inc Adjustable switch device
US3632936A (en) * 1970-10-28 1972-01-04 Cutler Hammer Inc Integral reversing trigger switches for speed controlled portable tools
US3689715A (en) * 1971-09-21 1972-09-05 Ashley C Glenn Electrical switching device and circuit board therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3594523A (en) * 1969-05-08 1971-07-20 Skil Corp Electric switch with bridging contact
US3603757A (en) * 1969-09-18 1971-09-07 Lucerne Products Inc Adjustable switch device
US3632936A (en) * 1970-10-28 1972-01-04 Cutler Hammer Inc Integral reversing trigger switches for speed controlled portable tools
US3689715A (en) * 1971-09-21 1972-09-05 Ashley C Glenn Electrical switching device and circuit board therefor

Cited By (43)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118614A (en) * 1976-07-02 1978-10-03 Robert Bosch Gmbh Multiple-function, hand-actuated switch unit, particularly for electrical hand tools or appliances and the like
DE2629722A1 (de) * 1976-07-02 1978-01-12 Scintilla Ag Handbetaetigbare einbauschaltvorrichtung
US4180716A (en) * 1977-11-15 1979-12-25 Fujisoku Electric Co., Ltd. Switch having lock-off and lock-on
JPS597706Y2 (ja) * 1978-03-06 1984-03-09 株式会社フジソク スイツチの可動接片オフロツク構造
JPS54131978U (es) * 1978-03-06 1979-09-12
JPS54131979U (es) * 1978-03-06 1979-09-12
US4204580A (en) * 1978-08-03 1980-05-27 The Singer Company Forward biased switch for a reversible hammer drill
US4277661A (en) * 1978-09-07 1981-07-07 J. & J. Marquardt Basic electric switch with an additional switch portion
US4329555A (en) * 1978-11-27 1982-05-11 Lucerne Products, Inc. Trigger operated tool handle switch
EP0033409A2 (en) * 1980-02-04 1981-08-12 Lucerne Products, Inc. Trigger operated tool handle switch
EP0033409A3 (en) * 1980-02-04 1981-08-26 Lucerne Products, Inc. Trigger operated tool handle switch
US4337425A (en) * 1980-06-02 1982-06-29 Eaton Corporation Speed control trigger switch
EP0048124A3 (en) * 1980-09-12 1982-12-08 Skil Nederland B.V. Speed control switch device
EP0048124A2 (en) * 1980-09-12 1982-03-24 Skil Nederland B.V. Speed control switch device
JPS57115125U (es) * 1981-01-09 1982-07-16
JPS6344900Y2 (es) * 1981-01-09 1988-11-22
WO1983002358A1 (en) * 1981-12-28 1983-07-07 Lucerne Products Inc Trigger operated tool handle switch
US4505170A (en) * 1982-09-30 1985-03-19 Laere Christiaan G M Hand-holdable electric power tool apparatus
US4822958A (en) * 1982-09-30 1989-04-18 Laere Christiaan G M Electric rotary power tool apparatus holdable by hand during operation, kit comprising the same; and novel switch means therefor
US4553005A (en) * 1984-03-08 1985-11-12 Eaton Corporation Trigger operated electric switch
US4587384A (en) * 1984-07-12 1986-05-06 Black & Decker, Inc. Sub-assembly for electric motor including reversing switch
US4572997A (en) * 1984-10-09 1986-02-25 Fujisoku Electric Co., Ltd. Trigger switch
US4675540A (en) * 1985-02-15 1987-06-23 Ranco Electronics Division Toggle electrical switch
US4734547A (en) * 1985-08-05 1988-03-29 Fujisoku Electric Co., Ltd. Reversing speed control switch
US4864083A (en) * 1988-04-15 1989-09-05 Lucerne Products, Inc. Reversing switch
US4968922A (en) * 1988-04-15 1990-11-06 Lucerne Products, Inc. Reversing switch
EP0374959A2 (en) * 1988-12-23 1990-06-27 OMRON Corporation Switch mechanism for an electric power tool
EP0374959A3 (en) * 1988-12-23 1991-09-11 OMRON Corporation Switch mechanism for an electric power tool
EP0444907A2 (en) * 1990-03-01 1991-09-04 Black & Decker Inc. Switch
EP0444907A3 (en) * 1990-03-01 1992-01-08 Black & Decker Inc. Switch
US5223770A (en) * 1991-04-04 1993-06-29 Andreas Stihl Portable handheld work apparatus having an electric drive motor
US6469268B1 (en) * 1998-07-24 2002-10-22 Marquardt Gmbh Electrical switch
US6664490B2 (en) * 2001-11-27 2003-12-16 Satori-S-Tech Co., Ltd. Switching mechanism and electric switch using the same
US20060186102A1 (en) * 2005-02-09 2006-08-24 Isao Inagaki Trigger switch
US7511240B2 (en) * 2005-02-09 2009-03-31 Satori S-Tech Co., Ltd. Trigger switch
CN101699593B (zh) * 2006-01-27 2012-06-13 上海拜骋电器有限公司 开关组件
US7476821B1 (en) * 2007-07-24 2009-01-13 Defond Components Limited Trigger mechanism
US20090026058A1 (en) * 2007-07-24 2009-01-29 Defond Components Limited Trigger mechanism
CN101527207B (zh) * 2008-02-25 2012-06-20 佐鸟控制科技有限公司 电动工具用开关
US20120000755A1 (en) * 2009-03-02 2012-01-05 Makita Corporation Electric tool
US8493172B2 (en) 2011-09-30 2013-07-23 Snap-On Incorporated Variable speed toggle trigger
US20150282337A1 (en) * 2014-03-28 2015-10-01 Black & Decker Inc. Variable-speed actuator for a power tool
US12059792B2 (en) 2019-08-16 2024-08-13 Milwaukee Electric Tool Corporation Mode selection of a power tool

Also Published As

Publication number Publication date
NL7309471A (es) 1974-01-29
CA973604A (en) 1975-08-26
JPS4958320A (es) 1974-06-06
ES415400A1 (es) 1976-02-16
AU5724773A (en) 1975-01-09
CH584481A5 (es) 1977-01-31
IT986166B (it) 1975-01-20
DE2333508A1 (de) 1974-02-14
GB1440807A (en) 1976-06-30
FR2195111B1 (es) 1977-02-11
FR2195111A1 (es) 1974-03-01

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