US3814886A - Miniature electrical reversing switch mounted on trigger operated switch for hand-held tools - Google Patents

Miniature electrical reversing switch mounted on trigger operated switch for hand-held tools Download PDF

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Publication number
US3814886A
US3814886A US00331969A US33196973A US3814886A US 3814886 A US3814886 A US 3814886A US 00331969 A US00331969 A US 00331969A US 33196973 A US33196973 A US 33196973A US 3814886 A US3814886 A US 3814886A
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United States
Prior art keywords
switch
actuator
lock
tool
trigger
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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
US00331969A
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English (en)
Inventor
E Piber
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
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Filing date
Publication date
Application filed by Cutler Hammer Inc filed Critical Cutler Hammer Inc
Priority to US00331969A priority Critical patent/US3814886A/en
Priority to FR7341245A priority patent/FR2217783B3/fr
Priority to DE2359292A priority patent/DE2359292A1/de
Priority to GB640174A priority patent/GB1436275A/en
Application granted granted Critical
Publication of US3814886A publication Critical patent/US3814886A/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
    • 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

  • Vanderhye arne 41491 THq h R- Ra hsr Wm-HA: Autio 5 7 ABSTRACT A miniature electrical reversing switch is disclosed for a power tool trigger switch wherein separate pairs of fixed contacts in the switch circuitry are selectively bridged by bridging contactors to reverse current flow therefrom to the tool motor.
  • the contactors are mounted on a movable slide member which is part of a compact one-piece integral plastic molding also including an integral flexible hinge and external knob operator.
  • the knob operator is mounted concentric with the trigger lock pin bushing and is manually rotated about the base thereof for coaction with the flexing hinge to impart linear sliding action to the slide and bridging contactors relative to the fixed contacts.
  • This invention generally relates to electrical reversing switches for power tools and the like and more particularly to improvements therein that contribute to miniaturization of such switches and economies of manufacture.
  • switches have been devised for power tools and household appliances to reverse the direction of rotation of the electric motor for such devices.
  • manufacture of these switches is exceedingly competitive necessitating that cost thereof be kept to an absolute minimum.
  • manufacturers of such switches are called upon by their customers to supply switches of improved quality as compared to switches used in the past.
  • existing switches are generally complicated and bulky requiring a considerable amount of space within the tool.
  • the general object of the present invention is to provide an improved reversing switch of the type described which circumvents the problems heretofore noted as well as other disadvantages of the prior art.
  • FIG. I is an elevation view partially broken away of a power tool handle mounting a trigger switch embodying the miniature reversing switch of the present invention.
  • FIG. 2 is a perspective view of the miniature reversing switch in FIG. 1 shown in combination with a known trigger switch.
  • FIG. 3 is an exploded view in perspective of the miniature reversing switch of FIGS. I and 2 constructed in accordance with the present invention.
  • FIG. 4 is a bottom view of the miniature reversing switch housing illustrating internal structural details with one fixed contact in place.
  • FIG. 5 is a cross sectional view of the switch illustrated in FIG. 4 taken along line 5-5 of FIG. 4 illustrating the flap in the closed position.
  • FIG. 6 is a front view of the reversing switch in FIG. 4
  • FIG. 7 is a plan view of the contact carrier and knob actuator assembly with the contactor strips in place.
  • FIG. 8 is a schematic illustration of the tool motor and switching circuit embodying the present invention and illustrating tool motor operation in the FOR- WARD direction of rotation.
  • FIG. 9 is a schematic illustration of the tool motor and switch circuit embodying the present invention and illustrating tool motor operation in the REVERSE" direction of rotation.
  • FIG. I of the drawings there is shown therein a power tool of the portable type indicated generally at 10 having a trigger operated switch 12 incorporating a miniature motor reversing switch 14 constructed in accordance with the instant invention.
  • the tool illustrated is of the type which incorporates a depending pistol grip handle 16 having switches 12 and 14 mounted therein.
  • Handle 16 which may be formed of cast aluminum or of a rigid high impact plastic material is separable into two sections and is provided with conventionally formed projections 0r ribs 17 and 18 which entrap switch 12 and with an aperature 22 through which linearly slidable trigger 24 of switch 12 extends.
  • Handle I6 is also provided with a hole 26 in the side wall thereof through which a conventional lock pin 28 of switch 12 extends and is further provided with a hole 30 in the bottom wall thereof through which the insulated power supply leads 32 and34 extend. Leads 32 and 34 connect switch 12 to a suitable power source (not shown).
  • switch 12 includesan insulating base 42, a switch frame 44fo'r securing trigger 24 to base 42, a lock pin 28 mounted on switch frame 44 and a helical compression spring (not shown) within switch 12 to bias trigger 24 externally of base 42.
  • contacts (not shown) within switch 12 are bridged closing the circuit to supply current over leads 48, 50, 52 54 and 56 to energize motor 36.
  • miniature motor reversing switch 14 is shown mounted atop frame 44 of switch 12. It should be noted at the outset that switch 14' utilizes a very efficient and compact double pole sliding bridge assembly to accomplish the motor reversing function and that such arrangement measures a mere 7/16 inch by 1 /8 inch dimension by /8 3 inch high, approximately. Further, while a double-pole sliding bridge switching arrangement will be used to illustrate the invention, it will be apparent to those skilled in the art, that the structure disclosed herein can also be used for other types of switches such as a double-pole double throw type or other varieties of single and multi-pole switches.
  • switch 14 is provided with an insulating housing 60 constructed of a suitable electrical insulating material such as a moldable thermoplastic and has pins 62 and 63 molded integral therewith to locate housing 60 in a predetermined position atop frame 44.
  • the pins are received in two holes 64 and 65 during assembly of housing 60 to frame 44 and may either be staked or deformed by heat to firmly secure housing 60 to frame 44.
  • housing 60 has a'plurality of spaced apart insulating shoulders 66 molded therein as shown in FIGS. 3 and 4 to form recesses or depressions 68 in housing 60 which are adapted to receive and retain individual spring contacts 70, 71, 72 and 73.
  • Contacts 70-73 are constructed of a good electrical conducting material such as copper and are individually secured within depressions 68 adjacent external housing openings 74 near the backside of housing 60 by an integrally hinged cover or flap 76 having an interlocking member 78 in interference fit with shoulder portions 79 in housing 60 upon closure of flap 76 as shown in FIG. 5.
  • Contacts 70-73 have openings 82 and83 and lead retainer springs 84 at one end to receive, secure and adjust leads 48, 50, 52 and 54.
  • the lead ends are inserted through openings 74 and 82 and are trapped therein by the retainer springs 84. Stops 91 on flap 76 limit inward travel of the leads through the openings past springs 84.
  • Access depressions 92 including thin penetrable membranes of thermoplastic material are molded integral with housing 60 directly in-line above holes 83 in contacts 70-73 to permit penetration for external manipulation of the retainer springs 84 relative to the leads without having to disassemble switch 14. The membrane serves to shield live electrical conductors from the environment and may be easily plugged after having been pierced.
  • Contacts 70-73 also have offset conducting portion 93 opposite the lead receiving end of the contacts extending from depressions 68 into slide cavity 80 to engage a sliding contact carrier assembly 95 externally operable through an open ended portion 96 of housing 60.
  • the carrier assembly 95 is a one-piece thermoplastic molding of generally rigid insulating material having good structural strength such as nylon and includes a slide 98, a flexing hinge 99 and a knurled knob actuator 100.
  • Slide 98 is provided with a detent projection 101 integrally formed on the side thereof as shown in FIGS. 3 and 7 for interlocking with detent recesses or depressions 102 and 103 in the flexible'side wall 104 of housing 60 for releasibly securing slide 98 in either forward or reverse modes of operation.
  • Slide 98 also includes an integral stop member 105 bounded by cavity 106 within housing 60 to prevent overtravel of detent projection I01 past depressions 102 and 103.
  • Slide 98 is further provided with recesses 107 and 108 molded in the topside thereof to receive and secure contactors 110 and 112 generally flush therewith as shoulder 113 of portions flap 76.
  • Knob actuator 100 includes an abutment or interlock pin 114 integrally molded on the periphery thereof and is adapted for coaction with spaced slots 116 and 118 in the trigger 24, necessitating movement of actuator 100 to either one of the two positions as shown in FIG. 2, to enable the trigger 24 to be depressed or moved inwardly of switch frame 44. It can readily be seen that trigger movement will be blocked for all other actuator positions by the central shoulder portion 120 of trigger 24.
  • the knob actuator 100 also includes a central bore 122 to permit mounting thereof concentric about the lock pin bushing 123 and extends externally from the side of handle 16 with lock pin 28 in a position to be actuated. It is to be noted that this arrangement requires no additional auxiliary openings in handle 16 and that the existing handle lock pin hole 26 need only be slightly enlarged to accommodate knob actuator 100. Thus, it is readily apparent that rotation of knob actuator 100 about bushing 123 will cause flexing hinge 99 to move contactor slide 98 to bridge selected pairs of contacts -73 with contactors 110 and 112 to cause motor 36 to run tool 10 in either the forward or reverse direction of rotation upon actuation of switch 12.
  • knob actuator causes shifting of contactors and 112 relative to conducting portions 93 of contacts 70-73 as shown in FIG. 9 to cause motor 36 to run tool 10 in the reverse direction of rotation upon actuation of switch 12.
  • contacts 70 and 71 are bridged to connect leads 48 and 50.
  • contacts 72 and 73 also are bridged to connect leads 52 and 54.
  • this shifting will cause motor 36 to run tool 10 in the reverse direction of rotation upon trigger actuation since the manner of introducing current to armature terminals 126 and 128 has been reversed.
  • the present invention provides a substantial improvement in reducing the number of component parts for reversing switches for power tools and appliances. lt will also bereadily recognized that such reduction of parts coupled with the unique arrangement and interaction of those utilized provides a highly efficient and durable miniature switch which is inexpensive to manufacture and readily adaptable to existing tools without the need for extensive or expensive tool handle modifications or for additional complicated wiring during the assembly stage of such tools.
  • a power tool comprising:
  • switch means on said tool for energizing said motor means in forward and reverse operation modes; lock means on said tool for locking said switch means in selected positions of actuation; and,
  • said switch means further includes actuator means having a portion of which is mountable on said lock means exposing a portion of said lock means to permit independent operation of each, said actuator means being operable with said switch means to cause said motor means to operate in either a forward or reverse operating mode.
  • said switch means comprises a first switch for energizing said motor means and a second switch including said actuator means for selecting the operating mode, wherein said lock means is operatively connected to said first switch, and wherein said second switch is in circuit and operatively connected to said first switch.
  • said lock means includes a lock pin bushing and a lock pin extending generally laterally of said housing, wherein said actuator means is a cylindrical knob having a central bore for mounting concentrically about said lock means for movement relative thereto and wherein said lock pin extends through said bore to permit independent operation thereof relative to said actuator means.
  • switch means in said frame having a trigger actuator which is operable, upon actuation, to energize a tool; lock means mounted transversely of said frame and operable to lock said trigger actuator in selected positions of actuation; and
  • said switch means further includes actuator means having a portion of which is mountable on said lock means exposing a portion of said lock means to permit independent operation of each, said actuator means being operable with said switch means to cause reversal of operating power to a power tool.
  • a trigger switch according to claim 4 wherein said lock means includes a lock pin bushing and a spring biased lock pin extending therethrough and generally laterally of said frame, wherein said actuator means is a cylindrical knob having a central bore for mounting concentrically about said lock means for movement relative thereto and wherein said lock pin further extends through said bore to permit independent operation thereof relative to said actuator means.
  • a trigger switch according to claim 4 wherein said trigger actuator further includes a plurality of slots and shoulders formed on a side face thereof, wherein said actuator means further includes interlock means which coact with said slots and shoulders to prevent said actuator means from being actuated to reverse power through said switch while said trigger actuator is in an actuating state.
  • switching means within a housing mounted on said frame being operable when energized to power said power tool in either a forward or reverse operating mode, said switching means comprising: a plurality of fixed contacts within said housing; contactor means adapted to conductively bridge selected fixed contacts to cause reversing of current through said switching means to said tool; and,
  • hinge means interconnecting said slide means and actuator means and being responsive to move said slide means in response to movement of said actuator means.
  • said lock means includes a lock pin bushing and lock pin extending generally laterally of said frame, wherein said actuator means is a generally cylindrical knob having a central bore for mounting concentrically about said lock means for relative movement to said actuator means.
  • a switch according to claim 7 wherein said fixed contacts have resilient retainer means for securing lead means thereto and wherein said housing has access means adjacent said contacts to permit adjustment of said retainer means relative to said lead means without having to disassemble said reversing switch.

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US00331969A 1973-02-12 1973-02-12 Miniature electrical reversing switch mounted on trigger operated switch for hand-held tools Expired - Lifetime US3814886A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00331969A US3814886A (en) 1973-02-12 1973-02-12 Miniature electrical reversing switch mounted on trigger operated switch for hand-held tools
FR7341245A FR2217783B3 (fr) 1973-02-12 1973-11-20
DE2359292A DE2359292A1 (de) 1973-02-12 1973-11-28 Schalteranordnung mit miniaturumsteuerschalter
GB640174A GB1436275A (en) 1973-02-12 1974-02-12 Electrical reversing switch assembly

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00331969A US3814886A (en) 1973-02-12 1973-02-12 Miniature electrical reversing switch mounted on trigger operated switch for hand-held tools

Publications (1)

Publication Number Publication Date
US3814886A true US3814886A (en) 1974-06-04

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US00331969A Expired - Lifetime US3814886A (en) 1973-02-12 1973-02-12 Miniature electrical reversing switch mounted on trigger operated switch for hand-held tools

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US (1) US3814886A (fr)
DE (1) DE2359292A1 (fr)
FR (1) FR2217783B3 (fr)
GB (1) GB1436275A (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4200781A (en) * 1978-08-15 1980-04-29 Eaton Corporation Manual switch for portable tools
US4277661A (en) * 1978-09-07 1981-07-07 J. & J. Marquardt Basic electric switch with an additional switch portion
JPS57115125U (fr) * 1981-01-09 1982-07-16
US4553005A (en) * 1984-03-08 1985-11-12 Eaton Corporation Trigger operated electric switch
US5212433A (en) * 1989-12-19 1993-05-18 Fanuc Ltd. Robot emergency stop circuit
WO1999046787A1 (fr) * 1998-03-11 1999-09-16 Marquardt Gmbh Commutateur electrique
US20110005905A1 (en) * 2009-07-13 2011-01-13 Chervon Limited Locking switch device for a power tool
CN101699593B (zh) * 2006-01-27 2012-06-13 上海拜骋电器有限公司 开关组件
US20130119915A1 (en) * 2011-11-10 2013-05-16 Daniel Pusateri Variable speed trigger mechanism
CN110323084A (zh) * 2019-07-22 2019-10-11 苏州华之杰电讯股份有限公司 一种无刷电机集成控制开关

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1210852B (it) * 1982-02-10 1989-09-29 Star Utensili Elett Commutatore perfezionato perl'inversione di marcia di un motore per utensili elettrici portatili.
DE3342412A1 (de) * 1983-11-24 1985-06-05 Black & Decker Inc., Newark, Del. Schalteranordnung fuer den drehrichtungsumschalter eines elektrowerkzeugs, insbesondere einer bohr- oder schlagbohrmaschine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB927322A (en) * 1958-12-23 1963-05-29 Electrolux Ab Improvements in or relating to electric switches for reversing electric motors
US3376402A (en) * 1967-09-25 1968-04-02 Black & Decker Mfg Co Reversible electric switch with laterally extending reversing member for use in portable electric tool or appliance
US3467801A (en) * 1967-05-01 1969-09-16 Lucerne Products Inc Reversing switch
US3725624A (en) * 1971-02-22 1973-04-03 Dynamics Corp America Rotary switch beater ejector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB927322A (en) * 1958-12-23 1963-05-29 Electrolux Ab Improvements in or relating to electric switches for reversing electric motors
US3467801A (en) * 1967-05-01 1969-09-16 Lucerne Products Inc Reversing switch
US3376402A (en) * 1967-09-25 1968-04-02 Black & Decker Mfg Co Reversible electric switch with laterally extending reversing member for use in portable electric tool or appliance
US3725624A (en) * 1971-02-22 1973-04-03 Dynamics Corp America Rotary switch beater ejector

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4200781A (en) * 1978-08-15 1980-04-29 Eaton Corporation Manual switch for portable tools
US4277661A (en) * 1978-09-07 1981-07-07 J. & J. Marquardt Basic electric switch with an additional switch portion
JPS57115125U (fr) * 1981-01-09 1982-07-16
JPS6344900Y2 (fr) * 1981-01-09 1988-11-22
US4553005A (en) * 1984-03-08 1985-11-12 Eaton Corporation Trigger operated electric switch
US5212433A (en) * 1989-12-19 1993-05-18 Fanuc Ltd. Robot emergency stop circuit
WO1999046787A1 (fr) * 1998-03-11 1999-09-16 Marquardt Gmbh Commutateur electrique
US6489578B1 (en) 1998-03-11 2002-12-03 Marquardt Gmbh Electrical switch
CN101699593B (zh) * 2006-01-27 2012-06-13 上海拜骋电器有限公司 开关组件
US20110005905A1 (en) * 2009-07-13 2011-01-13 Chervon Limited Locking switch device for a power tool
US20130119915A1 (en) * 2011-11-10 2013-05-16 Daniel Pusateri Variable speed trigger mechanism
US8716962B2 (en) * 2011-11-10 2014-05-06 Snap-On Incorporated Variable speed trigger mechanism
TWI474356B (zh) * 2011-11-10 2015-02-21 Snap On Tools Corp 可變速之扳機機構及一種可變地供應電力至馬達的方法
CN110323084A (zh) * 2019-07-22 2019-10-11 苏州华之杰电讯股份有限公司 一种无刷电机集成控制开关

Also Published As

Publication number Publication date
FR2217783A1 (fr) 1974-09-06
GB1436275A (en) 1976-05-19
DE2359292A1 (de) 1974-08-15
FR2217783B3 (fr) 1976-10-01

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