US3781579A - Protected lock means for electrically-operated,hand-manipulated tools - Google Patents

Protected lock means for electrically-operated,hand-manipulated tools Download PDF

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Publication number
US3781579A
US3781579A US00320732A US3781579DA US3781579A US 3781579 A US3781579 A US 3781579A US 00320732 A US00320732 A US 00320732A US 3781579D A US3781579D A US 3781579DA US 3781579 A US3781579 A US 3781579A
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US
United States
Prior art keywords
operator
switch
handle
lock
lock means
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
US00320732A
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English (en)
Inventor
F Rosenthal
L Rohr
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 Corp
Original Assignee
Black and Decker Manufacturing Co
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 Manufacturing Co filed Critical Black and Decker Manufacturing Co
Application granted granted Critical
Publication of US3781579A publication Critical patent/US3781579A/en
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

Definitions

  • ABSTRACT A portable, hand-held electrically powered tool activated, during operation, by a trigger-type, handlemounted switch-operator in a convenient position lending to efficient operation of the tool and in which the tool switch has at least an on and off" position.
  • a selectively operable lock means for the switch operator is accessible to the user of the tool but is recessed or protected so that it must be intentionally operated to a lock" position.
  • the lock means is constructed so that momentary reapplication of manual pressure to the switch-operator automatically de-activates the lock means and allows the electric motor to turn off" upon release of pressure on the operator.
  • the lock means is preferably, but not necessarily, located in a central position on the handle of the tool below the switch-operator.
  • the switch-operator may have two or more on positions in which it may be locked.
  • switch-operator for example, a trigger-like element on a handle, which can be locked in an on" poisition whereby the electric motor of the device continues to operate without the user keeping the switch-operator depressed.
  • switch-operator locks have included means exposed at the surface of the handle or tool housing, such as a button-like element projecting laterally from the handle. These exposed locking means are subject to inadvertent or accidental actuation such as by the user with his hand in normal position on the handle, whereby the tool may accidentally be locked on.
  • Thepresent invention is directed to an improved switch-operator lock means protectively disposed within a recess or protecting portion of the tool handle or housing of an electrically operated power tool and the like.
  • Thenovel construction is such that normal operation of the tool can'not result in the tool or device being inadvertently or accidentally locked on but must be intentionally so actuated.
  • the construction is such that the switch operator can be locked on" in more than one position, and is automatically released upon momentary reapplication of pressure to the switchoperator'.
  • the lock means desirably can be disposed for equal convenience for right and left-hand users.
  • FIG. 1 is a perspective view of a power tool incorporating the invention
  • FIG. 2 is an enlarged fragmentary perspective view of the handle portion of the tool of FIG. 1 showing in phantom lines the handle gripped in a users hand and illustrating the manner in which the other hand is used I to manipulate and positively actuate the switchoperator lock means;
  • FIG. 3 is an enlarged fragmentary side elevation, with portions broken away showing the operative portion of the switchoperator in conjunction with the improved lock means, and showing in phantom lines the position DESCRIPTION OF A PREFERRED EMBODIMENT
  • the housing switch, switch-operator and- /or lock means may be constructed of a variety of suitable materials.
  • the switch-operator lock means of the present invention is illustrated in relation to a portable drill, this expedient may be incorporated on other portable electric powered tools such as sanders, circular saws, etc., as well as other portable electric devices.
  • the preferred embodiment discloses the power tool as being operated from a convention A. C. power source connected thereto by a line cord, the present invention isequally applicable to cordless, battery-powered devices.
  • a portable electric drill in which the invention finds particular use, is indicated generally at 10 and comprises a housing 12 enclosing an electric motor drivingly connected to a tool chuck 14.
  • a dependent handle 16 is fixed to the housing 12 and has a line cord 18 extending therefrom and adapted for connection to a conventional A. C. source.
  • the tool 10 is provided with a control switch 20 suitably disposed in the handle 16 and interconnected with the motor for control thereof in the usual manner.
  • the illustrated switch 20 embodies a housing 21 having a switch operator or trigger 22 and a slider 26 rigid therewith slidably supported in the housing 21 and normally biased toward an off position, or toward the left, as seen in FIGS. 3 and 4 by a spring within the housing 21.
  • Switches of this type are well known in the art, for example, as shown in. the Matthews U.S. Pat. RE.26,267 issued Sept. 26, 1967.
  • the user applies finger pressure to-the trigger 22 moving it toward the right.
  • the tool 10 is turned off by releasing pressure on the trigger 22 whereupon it returns to the left opening the switch 20.
  • the switch housing 21 has a guide sleeve 34 formed integral therewith and extending forwardly thereof.
  • plunger 36 has an enlarged portion 38 vertically slidably disposed in a bore 37 in the sleeve 34 and has an upper flared end 46 disposed outside of the sleeve 34.
  • a compression spring 42 within the sleeve 34 engages a shoulder 40 on the plunger 38 and normally biases it downwardly as seen in the figures, toward the position shown in FIG. 3. Engagement between the flared end 46 and the sleeve 34 limits this downward movement.
  • An actuator 32 is provided for the plunger 36 and includes a foot 42 fixed to the enlarged portion 38, and a button 44 slidable on a face 34 of sleeve 44.
  • the button 44 extends partly into an aperture 30 formedin the handle 16 below the trigger 22, and may be slid upwardly using ones index finger as shown in FIG. 2.
  • the button 44 is so moved, after the trigger 22 has first been depressed using the index finger on ones other band, also as shown in FIG. 2, the flared plunger end 46 moves into engagement with a boss 28 depending from trigger 22.
  • the illustrated switch 20 is of the two spee "variety such that partial depression of trigger 22 effects low speed tool operation, while full trigger depression effects high speed operation.
  • the boss 28 has a pair of stepped shoulders 29, 31 adapted to align with plunger 36 when the trigger 22 is partially and fully depressed, respectively.
  • the trigger 22 is partially depressed and the button 44 raised (using the fingers in the manner shown in FIG. 2) to position whereby biased engagement between shoulder'31 and plunger end 46 holds trigger 22 and plunger 36 in this position.
  • the button 44 raised (using the fingers in the manner shown in FIG. 2) to position whereby biased engagement between shoulder'31 and plunger end 46 holds trigger 22 and plunger 36 in this position.
  • button 44 shown here by the button 44 being recessed within the wall of handle aperture 30, prevents the actuator 32 from being accidentally or unitentio'nally actuated to a locking position, or when in locked engagement with trigger boss 28 from being held in the locked position when it is desired to turn the tool off.
  • this undesirable condition existing in prior art exposed locking buttons, is hereby eliminated.
  • the lock actuator 32 of the present invention requires a positive, deliberate act to lock the switch andtool 10 on.
  • the central disposition of the actuator 32 and of trigger 22 lends the device to use with equal ease by right and left handed persons.
  • boss 28 could be adjustable relative to trigger 22.
  • said switchoperator means comprising a trigger element projecting from said handle means in a convenient, normal position on said handle means whereby said operator means is operable while conveniently gripped in a usershand through a normal, physical gripping action, said switch-operator means being normally urged toward the off position and being depressible into said handle means to turn said tool on, said lock means including spring means normally urging-it toward aposition released from said trigger.
  • switch-operator means includes a portion movable therewith and variably positionable relative to said means for retaining the switch-operator in an on position, movement lock means comprising a displaceable abutment element operatively engaged by said spring means, said displaceable abutment element being engagable with said portion movable, with said switchoperator and operable to prevent the switch-operator from moving to said off position.
  • switch-operator comprises a finger-engagable portion exposed exteriorly of said handle means, said portion movable with said switch-operator means comprising at least one'recess portion, said abutment portion being disp'laceably engageable in said recess portion for retaining said switch-operator meansiin a locked condition.
  • switch-operator means includes a recessed portion opening towards said abutment portion, said abutment portion being engagable in said recessed portion for locking said switch-operator means in a relatively fixed position subject to release by manual depression of the switch-operator by the user of the tool.
  • a motor housing for a portable, electrically powered tool including an operator-held handle, switch means in said handle including-a spring-urged switchoperator element havinga portion accessible exteriorly of said handle for. activating said tool, and lock means portion movable relative to said lock means, said lock means including a spring-urged abutment element normally urging said lock means to an off position.
  • said switch-operator comprises a trigger-like element displaceable in a path of travel relative to said handle, said orienting portion comprising at least one recess opening toward said lock means, said lock rneans comprising an elongated displaceable abutment element retained in a path of movement substantially normal to the path of travel of said trigger-like element.
  • said lock means comprises a sleeve circumposed about and guidingly engaging said elongated element, spring means circumposed about said elongated element and normally urging it away from said trigger-like element, the portion exposed at the surface of the handle of said lock means being fixedly connected to said elongated element.
  • said handle includes an opening into which an exposed portion of said lock means operator element projects, the outer surface of said handle at said opening being spaced outwardly from and protecting the lock means operator element from inadvertent engagement and actuation by a users hand.
  • a hand-held, portable, power-operated device comprising a housing enclosing a motor, output means interconnected with said motor and driven thereby and located exteriorly of said housing, said housing including a handle portion for manipulation of said device, a motor controlling operator accessibly disposed on said handle portion for operation by a user, means normally biasing said operator toward an off position, and lock means for said motor controlling operator, said lock means including a finger engageable portion located in an opening in said handle portion and spaced inwardly from the outer surface thereof, said lock means being releasably engageable with said motor controlling operator and operable to lock said operator in said on posi-' tion, means normally biasing said lock means toward a position released from said operator, whereby said lock means and said operator are interconnectable when both are operator actuated against their respective biasing means, and are releasable to permit said operator to move to its off position upon momentary reengagement of said operator means by said user.

Landscapes

  • Drilling And Boring (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Portable Nailing Machines And Staplers (AREA)
US00320732A 1973-01-03 1973-01-03 Protected lock means for electrically-operated,hand-manipulated tools Expired - Lifetime US3781579A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US32073273A 1973-01-03 1973-01-03

Publications (1)

Publication Number Publication Date
US3781579A true US3781579A (en) 1973-12-25

Family

ID=23247661

Family Applications (1)

Application Number Title Priority Date Filing Date
US00320732A Expired - Lifetime US3781579A (en) 1973-01-03 1973-01-03 Protected lock means for electrically-operated,hand-manipulated tools

Country Status (11)

Country Link
US (1) US3781579A (ja)
JP (1) JPS5324708Y2 (ja)
AU (1) AU467492B2 (ja)
BR (1) BR7310158D0 (ja)
CA (1) CA987713A (ja)
DE (1) DE2363439A1 (ja)
FR (1) FR2212203B1 (ja)
GB (1) GB1448730A (ja)
IT (1) IT1002479B (ja)
SE (1) SE392363B (ja)
ZA (1) ZA738635B (ja)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873796A (en) * 1973-07-06 1975-03-25 Black & Decker Mfg Co Trigger mechanism for hand-operated power device including independently operable locking devices providing automatic lock off and manual lock-on operation
US4296290A (en) * 1980-01-16 1981-10-20 The Singer Company Safety lock-on motor control
US4962396A (en) * 1987-12-22 1990-10-09 Fuji Photo Film Co., Ltd. Single lock switch for inputting commands associated with shooting in movie camera
US5136130A (en) * 1991-04-02 1992-08-04 Waxing Corporation Of America Locking actuator trigger button for electrical switch
US5195164A (en) * 1990-05-17 1993-03-16 Lambert William S Electric heater/blowers with selectively-locked output variable heat and blower controls
DE4225287A1 (de) * 1992-07-31 1994-02-03 Marquardt Gmbh Elektrischer Schalter zur Drehzahlregulierung von Motoren
EP0923096A2 (en) * 1997-12-11 1999-06-16 Black & Decker Inc. Electric power tool, in particular a router
US20040141818A1 (en) * 2003-01-16 2004-07-22 Kuhn Jayme K. Dual chuck electrical hand drill
US20060060365A1 (en) * 2004-09-22 2006-03-23 Michael Kunz Hammer drill
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
US9473055B2 (en) * 2012-08-20 2016-10-18 Hitachi Koki Co., Ltd. Electric working machine
US20210304975A1 (en) * 2018-08-24 2021-09-30 Omron Corporation Trigger switch

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1167500B (it) * 1981-09-10 1987-05-13 Star Utensili Elett Dispositivo di comando a grilletto per un interruttore elettrico, in particolare per utensili elettrici portatili
EP0157186B1 (de) * 1984-04-03 1990-01-10 Preh-Werke GmbH & Co. KG Arretierbarer Schiebeschalter
JPH0871934A (ja) * 1994-08-30 1996-03-19 Max Co Ltd ネジ締め機におけるスイッチのロック機構

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1929662A (en) * 1930-08-16 1933-10-10 Wappat Inc Motor driven tool switch
US2200322A (en) * 1936-08-15 1940-05-14 Walter A Arnesen Cautery handle
US2487011A (en) * 1946-06-18 1949-11-01 Black & Decker Mfg Co Switch assembly for portable electric tools
US3327196A (en) * 1965-04-01 1967-06-20 Carling Electric Inc Variable speed control for power hand tools and the like

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873796A (en) * 1973-07-06 1975-03-25 Black & Decker Mfg Co Trigger mechanism for hand-operated power device including independently operable locking devices providing automatic lock off and manual lock-on operation
US4296290A (en) * 1980-01-16 1981-10-20 The Singer Company Safety lock-on motor control
US4962396A (en) * 1987-12-22 1990-10-09 Fuji Photo Film Co., Ltd. Single lock switch for inputting commands associated with shooting in movie camera
US5195164A (en) * 1990-05-17 1993-03-16 Lambert William S Electric heater/blowers with selectively-locked output variable heat and blower controls
US5136130A (en) * 1991-04-02 1992-08-04 Waxing Corporation Of America Locking actuator trigger button for electrical switch
WO1992017894A1 (en) * 1991-04-02 1992-10-15 Waxing Corporation Of America Locking trigger button for electrical switch
DE4225287A1 (de) * 1992-07-31 1994-02-03 Marquardt Gmbh Elektrischer Schalter zur Drehzahlregulierung von Motoren
EP0923096A3 (en) * 1997-12-11 2000-05-10 Black & Decker Inc. Electric power tool, in particular a router
EP0923096A2 (en) * 1997-12-11 1999-06-16 Black & Decker Inc. Electric power tool, in particular a router
US20040141818A1 (en) * 2003-01-16 2004-07-22 Kuhn Jayme K. Dual chuck electrical hand drill
US7066692B2 (en) * 2003-01-16 2006-06-27 Kuhn Jayme K Dual chuck electrical hand drill
US20060060365A1 (en) * 2004-09-22 2006-03-23 Michael Kunz Hammer drill
US8511399B2 (en) 2004-09-22 2013-08-20 Black & Decker Inc. Hammer drill with mode lock on
US9473055B2 (en) * 2012-08-20 2016-10-18 Hitachi Koki Co., Ltd. Electric working machine
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
US20210304975A1 (en) * 2018-08-24 2021-09-30 Omron Corporation Trigger switch

Also Published As

Publication number Publication date
DE2363439A1 (de) 1974-07-04
CA987713A (en) 1976-04-20
JPS49121188U (ja) 1974-10-17
IT1002479B (it) 1976-05-20
FR2212203A1 (ja) 1974-07-26
AU467492B2 (en) 1975-12-04
SE392363B (sv) 1977-03-21
FR2212203B1 (ja) 1977-06-10
AU6231473A (en) 1975-05-15
BR7310158D0 (pt) 1974-08-29
JPS5324708Y2 (ja) 1978-06-24
ZA738635B (en) 1974-10-30
GB1448730A (en) 1976-09-08

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