US3746813A - Lock-off switch - Google Patents

Lock-off switch Download PDF

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Publication number
US3746813A
US3746813A US00217830A US3746813DA US3746813A US 3746813 A US3746813 A US 3746813A US 00217830 A US00217830 A US 00217830A US 3746813D A US3746813D A US 3746813DA US 3746813 A US3746813 A US 3746813A
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US
United States
Prior art keywords
trigger
detent
locking member
switch
frame
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.)
Expired - Lifetime
Application number
US00217830A
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English (en)
Inventor
H Brown
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.)
Cutler Hammer Inc
Original Assignee
Cutler Hammer 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 Cutler Hammer Inc filed Critical Cutler Hammer Inc
Application granted granted Critical
Publication of US3746813A publication Critical patent/US3746813A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01H13/50—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member
    • H01H13/62—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a single operating member the contact returning to its original state upon manual release of a latch
    • 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

  • the rigid lock lever is angularly dis- UNITED STATES PATENTS posed so that attempted forcing of the switch actuator 3,662,136 5/1972 Bienwald et al. 200/157 Without depressing the release button lightens the lock- FOREGN PATENTS OR APPLICATIONS mg engagement to absolutely prevent operatlon.
  • Lock-off switches have been known heretofore.
  • One form of such prior switch is characterized primarily by a laterally sliding pin or rotary knob which in one position engages an abutment to prevent switch actuator movement and in another position clears such abutment to allow actuator movement. Manual setting is required for either position.
  • Another form of such prior switch is characterized by a resilient L-shaped locking member having a detent thereon that snaps into a hole in the switch frame whenever the switch is released to return to its off position. This L-shaped member is mounted at its foot into the switch trigger and its shank portion that has the detent is biased by its own resilience against the switch frame as shown in Merlin R. Dummer copending application Ser. No. 195,167, filed Nov. 3, 1971.
  • This invention relates to improvements thereover.
  • This invention relates to a lock-off switch and more particularly to a switch incorporating an automatically engaging off lock that allows the user to pick up a circular saw or the like without inadvertently turning it on.
  • An object of the invention is to provide an improved lock-off switch of the self-enclosed type.
  • a more specific object of the invention is to provide an off-lock for a trigger switch that not only prevents forcing but also enhances locking engagement on attempted forcing.
  • Another specific object of the invention is to provide a trigger switch with a compression spring biased, rigid lever off-lock.
  • Another specific object of the invention is to provide a rigid lever off-lock of the aforementioned type with an angular orientation to enhance locking engagement on attempted forcing.
  • Another specific object of the invention is to provide a rigid lever off-lock of the aforementioned type with an offset seat within the trigger to enhance locking engagement on attempted forcing.
  • Another specific object of the invention is to provide a trigger switch with a compression spring biased, angularly disposed, rigid lever off-lock that is readily releasable by the conventional thumb-operated plunger but- I011.
  • FIG. 1 is an enlarged isometric view of a lock-off switch of the trigger type constructed in accordance with the invention
  • FIG. 2 is a left side elevational view of the switch of FIG. 1;
  • FIG. 3 is a sectional view taken approximately along line 33 of FIG. 2;
  • FIG. 4 is an exploded isometric view of the trigger, lock lever and bias spring of the switch of FIGS. 1-3.
  • FIG. 1 there is shown a lock-off switch of the in-line trigger actuated type constructed in accordance with the invention.
  • This switch comprises an insulating base 2 housing the switch contacts, or speed control circuit and switch contacts, as desired.
  • This base normally has holes in the bottom through which conductors extend or through which conductors may be inserted for connecting the trigger switch to an external circuit.
  • the base has an open top through which the trigger is coupled to the switch and switch actuation takes place in response to depression of the trigger as shown, for example, in R. G. Miller US. Pat. No. 3,242,298, dated Mar. 22, 1966.
  • this switch is adapted for mounting in the handle of a portable tool such as an electric saw or the like.
  • a trigger 4 of the in-line movement type has a fingerengaging portion 4a and a slidable portion 4b, the latter portion overlying the base and being held on the base by a frame 6 that may be made of metal or molded insulating material.
  • a helical compression spring 8 shown in FIG. 3 biases the trigger into its forwardly extended of (contact open) position and the trigger may be depressed by the forefinger of the user against the force of this return spring 8 into its on" (contact closed) position.
  • frame 6 is provided at its top with a pair of rectangular apertures 6a to limit the trigger movement in the forward direction. Extending up through these apertures are respective projections integrally molded on the upper surface of slidable portion 4b of the trigger. As will be apparent, these projections stop against the forward end of these apertures when the trigger is in its off position. Abutment 4d shown in FIG. 2 stops against the base when the trigger is depressed into its fully on position.
  • the slidable portion of the trigger is provided with a groove 4e for accommodating return spring 8.
  • One end of this return spring abuts the forward end wall of this groove and the other end abuts the rear, interior end wall of the frame.
  • the lock-off mechanism comprises a rigid lever 10, most clearly shown in FIG. 4, a bias spring 12 for this lever including a well 14 for this spring, a slot 16 and notch 18 for retaining the lock lever, and a locking hole 6b or catch in the left side of the frame for receiving the detent 10a or stop rigidly secured to or integrally formed on lock lever 10.
  • the lock lever 10 is mounted on the trigger.
  • the trigger is provided at its left side with the aforementioned slot 16 having its greatest depth portion 16a at its forward end as shown in FIG. 3, and a shallower, inclined-toward-shallower portion 16b extending therefrom to the rear end of this slot, with an overhanging ledge above this inclined portion 16b to confine the lock lever therebelow.
  • Round well 14 extends toward the right from this inclined portion 16b as shown in FIGS. 3 and 4.
  • Notch 18 is in the forward end of slot 16 and is offset toward the right as shown in FIG. 3 so as to dispose the lock lever at an angle toward the left rear with respect to the forward center line of the trigger.
  • the lock-off lever is stiff enough to resist bending or flexing if the trigger is attempted to be forced, and is provided with a small angle bend just forwardly of detent 10a to dispose its rear end portion toward parallelism with the aforementioned center line of the trigger so as to bring detent 10a closely toward a parallel plane with respect to the frame adjacent hole 6b.
  • lock lever fits into slot 16.
  • the forward end of this lock lever is seated in notch 18 and the rear end of the lock lever extends into close spaced relation with the lateral rear end wall of shallower portion 16b of the slot.
  • the inclined wall of slot 16b is substantially complementary to the angularly disposed lock lever. Therefore, when the trigger is depressed, force is applied at notch 18 to the lock lever.
  • the rear end wall of slot 16b moves the lock lever forwardly until detent 10a snaps into hole 6b in the frame to automatically lock the trigger off.
  • the manual release means comprises a release button 20 similar to the conventional on lock button used in trigger switches.
  • This release button is mounted within a sleeve 60, the latter being rigidly secured over a hole in the left side of the frame at the vertical level of the intermediate portion of lock-off lever 10.
  • This release button is attached to a shaft 20a that extends through the mounting sleeve and hold in the frame, and a helical compression spring 22 shown in FIG. 3 surrounds this shaft to bias the release button outwardly, toward the left.
  • the right, or inner, end of this shaft is spun larger than its hole in the frame to secure the release button to the frame.
  • the release button when the user presses the release button, it moves inwardly plunger-like against the force of spring 22, and the inner end of the shaft pivots the lock lever counter clockwise as seen in HO. 3 in notch 18 against the force of bias spring 12 until detent 10a clears hole 6b in the frame. While the release button is so held, the trigger may be depressed to close the switch. After the trigger is slightly depressed, the release button may be released since detent 10a has moved back of hole 6b and can no longer fall therein.
  • a self-enclosed trigger switch for a portable electric tool affording operation of the tool but preventing accidental operation thereof comprising:
  • a movable spring-biased trigger having a normal off position in which the tool is not in operation and having an alternate on position in which the tool is in operation;
  • a rigid locking member having a detent at one end portion
  • said notch being in the forward end of said slot and seating the forward end of said rigid locking member for limited pivotal movement within said slot, and said rigid locking member being confined in said slot by the abutting rear end wall of the latter;
  • a compression spring within said trigger biasing said one end of said locking member against the adjacent inner wall of said frame
  • a spring-biased release button mounted on said frame and disposed to release said detent from said hole.
  • said rigid locking member comprises:
  • said notch is offset toward the center line of said trigger from the plane of said adjacent wall of the frame to dispose said locking member at an angle causing tightening of the locking engagement on attempted forcing of the trigger.
  • a self-enclosed trigger switch for a portable electric tool affording operation of the tool but preventing accidental operation thereof comprising:
  • amovable spring-biased trigger having a normal off position in which the tool is not in operation and having an alternate on position in which the tool is in operation;
  • a compression spring within said trigger biasing said one end of said locking member against the adjacent inner wall of said frame
  • said rigid locking member comprising an elongated strip of steel thick enough and stiff enough to resist bending or flexing on attempted forcing of the trigsaid detent comprising a steel disc rigidly secured to one surface of said steel strip adjacent the rear end thereof;
  • said notch is in the forward end of said slot and seats the forward end of said steel strip for limited pivotal movement within said slot.
  • said notch is offset toward the center line, of said trigger from the plane of said adjacent wall of the frame to dispose said locking member at an angle causing tightening of the locking engagement on attempted forcing of the trigger.
  • said trigger comprises an overhanging ledge over said slot for confining said locking member therebelow.
  • said compression spring is a helical spring having one end against the opposite surface of said locking member adjacent said detent;
  • said trigger comprises a well in said slot for retaining the other end of said spring.
  • a self-enclosed trigger switch mounted within said handle comprising:
  • a trigger mounted on said housing for limited sliding movement between an on position wherein the switch is in operation and an off position wherein the switch is not in operation;
  • said trigger extending out of said aperture for depression by the forefinger of the user
  • an automatically engaging off lock for said trigger including:

Landscapes

  • Push-Button Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Drilling And Boring (AREA)
  • Portable Power Tools In General (AREA)
US00217830A 1972-01-14 1972-01-14 Lock-off switch Expired - Lifetime US3746813A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21783072A 1972-01-14 1972-01-14

Publications (1)

Publication Number Publication Date
US3746813A true US3746813A (en) 1973-07-17

Family

ID=22812696

Family Applications (1)

Application Number Title Priority Date Filing Date
US00217830A Expired - Lifetime US3746813A (en) 1972-01-14 1972-01-14 Lock-off switch

Country Status (9)

Country Link
US (1) US3746813A (en。)
JP (1) JPS5526570B2 (en。)
CH (1) CH566067A5 (en。)
DE (1) DE2301522A1 (en。)
FR (1) FR2168064B1 (en。)
GB (1) GB1416041A (en。)
IT (1) IT976891B (en。)
NL (1) NL7300398A (en。)
SE (1) SE386302B (en。)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180716A (en) * 1977-11-15 1979-12-25 Fujisoku Electric Co., Ltd. Switch having lock-off and lock-on
US5383875A (en) * 1994-05-31 1995-01-24 Zimmer, Inc. Safety device for a powered surgical instrument
US5577600A (en) * 1995-11-21 1996-11-26 Emerson Electric Co. Switch lock-out device for power tool
US5653296A (en) * 1994-08-30 1997-08-05 Max Co., Ltd Switch-locking mechanism for screw tightener
US5778747A (en) * 1996-11-21 1998-07-14 Rexon Industrial Corp., Ltd. Power saw having an ergonomically-designed handle and safety switch
US6578645B2 (en) * 2000-03-16 2003-06-17 Georg Fischer Rohrverbindungstechnik Gmbh Throttle valve
US6742601B2 (en) * 2000-12-15 2004-06-01 Makita Corporation Battery powered tools
US20060000625A1 (en) * 2004-06-30 2006-01-05 Gison Machinery Co., Ltd. Pneumatic tool with settable safety function
US7133033B1 (en) * 1999-12-02 2006-11-07 Advanced Input Devices Uk Limited Actuator for a switch
US20100018847A1 (en) * 2008-07-24 2010-01-28 Omron Corporation Trigger switch
CN102097224A (zh) * 2011-01-26 2011-06-15 青岛埠元电子有限公司 自锁式安全开关及手持式料理棒
US20130140051A1 (en) * 2011-12-06 2013-06-06 Gardena Manufacturing Gmbh Hand-guided apparatus with an operating lever
US20150170848A1 (en) * 2013-12-17 2015-06-18 Robert Bosch Tool Corporation Portable power tool with trigger switch, trigger release and lock-on mechanism combination
US20180361553A1 (en) * 2015-12-22 2018-12-20 Robert Bosch Gmbh Hand-Held Power Tool Device
US10614977B2 (en) * 2016-12-22 2020-04-07 C. & E. Fein Gmbh Hand-held tool machine
CN115020140A (zh) * 2022-06-15 2022-09-06 宁波公牛电器有限公司 呼叫开关

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2335972C3 (de) * 1973-07-14 1978-06-15 J. & J. Marquardt, 7201 Rietheim Schalter, insbesondere für ein elektrisches Handwerkzeug
JPS567052Y2 (en。) * 1977-09-20 1981-02-16
JPS587946Y2 (ja) * 1977-11-15 1983-02-12 株式会社フジソク トリガ−スイツチ
DE2850120A1 (de) * 1977-11-21 1979-05-23 Black & Decker Mfg Co Schalter-betaetigungseinrichtung
JPS5824340Y2 (ja) * 1977-12-13 1983-05-25 株式会社フジソク オフロツク式トリガ−スイツチ
DE3315643C2 (de) * 1983-04-29 1985-08-08 Braun Ag, 6000 Frankfurt Automatischer Einschaltschutz
RU2178926C2 (ru) * 1999-12-28 2002-01-27 Всероссийский научно-исследовательский институт автоматики Переключающее устройство с управляемой блокировкой включения

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1263901B (de) * 1964-02-22 1968-03-21 Marquardt J & J Anordnung zur Schaltstellungsverriegelung von Schaltgeraeten, insbesondere von Geraeteschaltern mit Abhebekontakten
US3662136A (en) * 1971-05-20 1972-05-09 Leviton Manufacturing Co Trigger mechanism for power tool

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2503226A (en) * 1947-09-13 1950-04-04 Singer Mfg Co Switch locking means for portable electric tools
US3267223A (en) * 1964-08-12 1966-08-16 Cutler Hammer Inc Interlocking mechanism for electric switches
FR1424374A (fr) * 1965-02-12 1966-01-07 Widmaier Fa Hans Dispositif de commutation à touche ou bouton-poussoir utilisable notamment dans la technique des télécommunications

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1263901B (de) * 1964-02-22 1968-03-21 Marquardt J & J Anordnung zur Schaltstellungsverriegelung von Schaltgeraeten, insbesondere von Geraeteschaltern mit Abhebekontakten
US3662136A (en) * 1971-05-20 1972-05-09 Leviton Manufacturing Co Trigger mechanism for power tool

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4180716A (en) * 1977-11-15 1979-12-25 Fujisoku Electric Co., Ltd. Switch having lock-off and lock-on
US5383875A (en) * 1994-05-31 1995-01-24 Zimmer, Inc. Safety device for a powered surgical instrument
US5653296A (en) * 1994-08-30 1997-08-05 Max Co., Ltd Switch-locking mechanism for screw tightener
US5577600A (en) * 1995-11-21 1996-11-26 Emerson Electric Co. Switch lock-out device for power tool
US5778747A (en) * 1996-11-21 1998-07-14 Rexon Industrial Corp., Ltd. Power saw having an ergonomically-designed handle and safety switch
US7133033B1 (en) * 1999-12-02 2006-11-07 Advanced Input Devices Uk Limited Actuator for a switch
US6578645B2 (en) * 2000-03-16 2003-06-17 Georg Fischer Rohrverbindungstechnik Gmbh Throttle valve
US6742601B2 (en) * 2000-12-15 2004-06-01 Makita Corporation Battery powered tools
US20060000625A1 (en) * 2004-06-30 2006-01-05 Gison Machinery Co., Ltd. Pneumatic tool with settable safety function
US7044235B2 (en) * 2004-06-30 2006-05-16 Gison Machinery Co., Ltd Pneumatic tool with settable safety function
US20100018847A1 (en) * 2008-07-24 2010-01-28 Omron Corporation Trigger switch
US8217283B2 (en) * 2008-07-24 2012-07-10 Omron Corporation Trigger switch
CN102097224A (zh) * 2011-01-26 2011-06-15 青岛埠元电子有限公司 自锁式安全开关及手持式料理棒
CN102097224B (zh) * 2011-01-26 2013-05-29 青岛埠元电子有限公司 自锁式安全开关及手持式料理棒
US20130140051A1 (en) * 2011-12-06 2013-06-06 Gardena Manufacturing Gmbh Hand-guided apparatus with an operating lever
US9162352B2 (en) * 2011-12-06 2015-10-20 Husqvarna Ab Hand-guided apparatus with an operating lever
US20150170848A1 (en) * 2013-12-17 2015-06-18 Robert Bosch Tool Corporation Portable power tool with trigger switch, trigger release and lock-on mechanism combination
US10014128B2 (en) * 2013-12-17 2018-07-03 Robert Bosch Tool Corporation Portable power tool with trigger switch, trigger release and lock-on mechanism combination
US20180361553A1 (en) * 2015-12-22 2018-12-20 Robert Bosch Gmbh Hand-Held Power Tool Device
US11052526B2 (en) * 2015-12-22 2021-07-06 Robert Bosch Gmbh Hand-held power tool device
US10614977B2 (en) * 2016-12-22 2020-04-07 C. & E. Fein Gmbh Hand-held tool machine
CN115020140A (zh) * 2022-06-15 2022-09-06 宁波公牛电器有限公司 呼叫开关

Also Published As

Publication number Publication date
FR2168064B1 (en。) 1976-08-27
GB1416041A (en) 1975-12-03
SE386302B (sv) 1976-08-02
JPS4878476A (en。) 1973-10-22
NL7300398A (en。) 1973-07-17
FR2168064A1 (en。) 1973-08-24
JPS5526570B2 (en。) 1980-07-14
DE2301522A1 (de) 1973-07-19
IT976891B (it) 1974-09-10
CH566067A5 (en。) 1975-08-29
AU5105773A (en) 1974-07-18

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