US3594523A - Electric switch with bridging contact - Google Patents

Electric switch with bridging contact Download PDF

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Publication number
US3594523A
US3594523A US822909A US3594523DA US3594523A US 3594523 A US3594523 A US 3594523A US 822909 A US822909 A US 822909A US 3594523D A US3594523D A US 3594523DA US 3594523 A US3594523 A US 3594523A
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US
United States
Prior art keywords
contact
actuator
bridging
engagement
fixed
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
US822909A
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English (en)
Inventor
Carl J Frenzel
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.)
Skil Corp
Original Assignee
Skil Corp
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Filing date
Publication date
Application filed by Skil Corp filed Critical Skil Corp
Application granted granted Critical
Publication of US3594523A publication Critical patent/US3594523A/en
Anticipated expiration legal-status Critical
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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
    • H01H13/02—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
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/18—Contacts characterised by the manner in which co-operating contacts engage by abutting with subsequent sliding
    • 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
    • H01H13/64—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 wherein the switch has more than two electrically distinguishable positions, e.g. multi-position push-button switches

Definitions

  • An actuator in the form of a trigger moves a bridging contact back and forth between bridging and nonbridging positions with respect to a pair of fixed contacts mounted in spaced relation on a dielectric base.
  • a fixed abutment surface is provided adjacent one of the fixed contacts.
  • the bridging contact includes an abutment surface arranged to engage the fixed abutment surface for defining a fulcrum about which the bridging contact is rocked.
  • the actuator and the bridging contact include respective interengaged formations for rocking the bridging contact about such fulcrum thereby to swing a portion of the bridging contact into and away from engagement with the other fixed contact.
  • the present invention has to do with improvements in electric switches of the type e.g., as shown in Matthews U.S. Pat. No. Re. 26,267, wherein a bridging contact is slid between bridging and nonbridging positions with respect to a pair of fixed contacts mounted in spaced relation on .a dielectric base.
  • the bridging contact includes a pair of spaced contact faces arranged for simultaneous engagement with respective fixed contacts thereby to define the bridging position of the bridging contact.
  • One of these contact faces may slide along the associated fixed contact and remain in engagement with the same at all times.
  • the switch is closed for closing the associated circuit and energizing a load device, such as an electric motor. It is desirable that this other contact face be maintained in substantial spaced relation from the other fixed contact to define the open or off" position of the switch.
  • a load device such as an electric motor.
  • a primary object of the present invention is the provision of an electric switch including a bridging contact movable with respect to a pair of fixed contacts, wherein one end of the bridging contact is moved into and out of engagement with one of the fixed contacts in a fast and highly effective manner.
  • Another object of the present invention is the provision of a switch of the type described wherein the bridging contact includes a pair of spaced contact faces and wherein means are provided for rocking such bridging contact about one of its contact faces thereby to move the other contact face into and out of engagement with an associated fixed contact.
  • Still another object of the present invention is the provision of a switch according to the foregoing object wherein a fixed abutment surface engages an abutment surface on the bridging contact thereby to define a fulcrum for rocking the bridging contact thereabout.
  • Another object of the present invention is the provision of a switch of the type described wherein the bridging contact cooperates with the fixed abutment surface and with formations on the actuator to define a positive stop for the latter.
  • FIG. 1 is a partial side elevation and partial section of an electric switch embodying the present invention, the switch being shown off position;
  • FIG. 2 is an electrical schematic showing a circuit for utilizing the switch shown in FIG. 1;
  • FIG. 3 is a partial side elevation and partial section similar to FIG. 1 and showing the switch in the on" position;
  • FIG. 4 is a partial side elevation and partial section similar to FIG. 3 and showing the switch in a bypass" position.
  • the present invention is shown embodied in a trigger actuated speed control switch for a power device, such as a hand-operated electric drill.
  • the switch device includes a casing or housing having an upper portion defining a slideway or tunnel ll slidably receiving the stern I2 of a trigger 14.
  • the casing has a backwall in abutting engagement with one end of a coil spring 16.
  • the other end of this spring is in abutting engagement with a surface 18 on the stem 12.
  • the spring 16 acts to urge the trigger 14 to its outward or extended position, i.e., to the right as viewed in FIG. I.
  • the casing 10 mounts a dielectric base 20 supporting an elongated contact strip 21. This base also supports a pair of contact buttons 22, 23 in longitudinal alignment with the contact strip 21.
  • the stem I2 includes a cavity receiving a bridging contact 25.
  • This bridging contact has a pair of spaced contact faces 26, 27.
  • the bridging contact also has an upstanding formation in the nature of an car 28; this car is received within a pocket or cavity 30 formed in the stem 12.
  • the pocket is somewhat larger than the ear thereby permitting the latter to rock in the former for defining a pivotal connection between the bridging contact and the trigger.
  • a coil spring 31 has one end thereof received within a blind bore in the stem I2; the other end of this spring engages the bridging contact for urging the same downwardly in the position shown in FIGS. 3 and 4.
  • the bridging contact 25 has an abutment surface 32 arranged for abutting engagement with a fixed abutment surface 34 which is constituted by a portion of the front wall of the casing I0.
  • the bridging contact includes another formation or abutment surface 34a which is arranged to abut a surface 35 formed in the cavity in the stem 12 of the trigger 14.
  • the spring 16 urges the trigger 14 to the right, i.e., to the extended position shown in FIG. 1. Movement of the trigger in this direction is stopped by reason of engagement of the bridging contact surface 34a with the trigger surface 35, by engagement of the ear 28 with the pocket 30, and by engagement of the abutment surfaces 32, 34. At this time, it should be pointed out that the engagement between the surfaces 32,
  • the bridging contact serves to define a stop for limiting outward movement of the trigger 14.
  • FIG. 3 illustrates the condition of the parts when the switch is in the on" position.
  • the spring 31 aids in maintaining the contact faces of the bridging contact in engagement with respective contacts 21, 22.
  • the switch which incorporates the present invention may be used in association with the speed control circuit shown and claimed in Gawron U.S. Pat. No. 3,209,228; this circuit is shown in FIG. 2 herein.
  • One line 40 of conventional house or line alternating current is connected to a terminal 41.
  • the contact 22 is connected to the cathode of a silicon controlled rectifier or other controllable semiconductor 42.
  • the anode of the silicon controlled rectifier 42 is connected to a terminal 43; this terminal is connected to one terminal of a series wound motor 44.
  • the other terminal of this motor is connected to the other line 45 of the alternating current power source.
  • the movable element 48a of the I variable resistor 48 is moved in a direct or positive manner by the trigger 14 by means of a suitable mechanical element 53.
  • This element 48a may be a contact slider similar to the bridging contact 25 and arranged for sliding movement (in response to trigger movement) along a carbon strip (not shown) mounted on the dielectric base in spaced parallel relation with the elongated contact strip 21.
  • the bridging contact face 27 engages the contact button 22 (the bridging contact face 26 is always in engagement with the contact strip 21) for energizing the motor 44 through the speed control circuit.
  • operation of the trigger varies the resistance of the variable resistor for controlling the firing angle of the SCR 42 thereby to vary the current supplied to the motor 44 for controlling the speed thereof in a continuously variable manner in response to trigger movement.
  • the bridging contact face 27 engages the contact button 23 thereby bypassing the speed control circuit and energizing the motor directly from the current source.
  • the present invention is not to be limited for use with a variable speed control switch; the invention has applicability inn a switch which simply opens and closes a circuit, i.e., an on-ofi switch.
  • the present invention provides a new and improved means for making and breaking contacts in a switch of the typedescribed.
  • the circuit is closed in a positive manner'preventing' arcing and pitting of the contact faces 22, 27.
  • the bridging contact according to the present invention also. serves as a stop to limit outward movement of the trigger.
  • an electric switch in combination, a dielectric base, at least a pair of fixed contacts mounted on said base in spaced relation, a first abutment surface fixedwith respect to said base and being adjacent one of said fixed contacts, a bridging contact having ends defining a pair of contact faces which are spaced for simultaneous engagement with said fixed contacts, respectively, said bridging contact having a first formation defining a second abutment surface which is nearer one of said contact faces than the other of said contact faces, said bridging contact having a second upstanding formation adjacent the end thereof defining said one contact face, an actuator movable relative to said base to and from an off position, means on said actuator connecting the latter with said upstanding formation such that movement of said actuator to its off position brings said first and second abutment surfaces into engagement with each other thereby to define a fulcrum for rocking said bridging contact in a first direction in a plane perpendicular to said'base about said one contact face with the latter in engagement with said one fixed contact whereupon said other
  • an electric switch including a dielectric base, at least a pair of fixed contacts mounted on said base in spaced relation, a bridging contact having ends defining contact faces spaced for simultaneous engagement with said fixed contacts, respectively, an actuator slidably movable relative to said base to and from an off position, the improvement for rocking said bridging contact about one of said contact faces when such face is in engagement with one of said fixed contacts thereby to raise and lower the other of said contact faces away from and into engagement, respectively, with the other of said fixed contacts comprising, a fixed abutment surface adjacent said one fixed contact, said bridging contact having an abutment surface spaced nearer said one contact face than said other contact face, said bridging contact having an upstanding formation, means on said actuator and engaged with said upstanding formation thereby defining a pivotal connection between said bridging contact and said actuator such that sliding movement of the latter imparts corresponding sliding movement to the former and permits rocking movement of said bridging contact in its own plane which is perpendicular to said base, movement of said

Landscapes

  • Push-Button Switches (AREA)
  • Slide Switches (AREA)
  • Drilling And Boring (AREA)
  • Percussive Tools And Related Accessories (AREA)
US822909A 1969-05-08 1969-05-08 Electric switch with bridging contact Expired - Lifetime US3594523A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82290969A 1969-05-08 1969-05-08

Publications (1)

Publication Number Publication Date
US3594523A true US3594523A (en) 1971-07-20

Family

ID=25237308

Family Applications (1)

Application Number Title Priority Date Filing Date
US822909A Expired - Lifetime US3594523A (en) 1969-05-08 1969-05-08 Electric switch with bridging contact

Country Status (7)

Country Link
US (1) US3594523A (de)
BE (1) BE750186A (de)
CH (1) CH516220A (de)
DE (1) DE2020557C3 (de)
FR (1) FR2046172A5 (de)
GB (1) GB1298882A (de)
NL (1) NL160423C (de)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731030A (en) * 1970-06-17 1973-05-01 Holzer Patent Ag Pushbutton switch assembly with pivotable conductive bridging member and multiple conductive path printed circuit board
US3755640A (en) * 1972-07-27 1973-08-28 Skie Corp Reversing switch for a power tool with separate selectively movable contact carriers
US4097703A (en) * 1977-08-05 1978-06-27 The Singer Company Trigger switch and lock mechanism therefore
US4097705A (en) * 1977-08-05 1978-06-27 The Singer Company Quick lock-release mechanism for a trigger switch
US4256942A (en) * 1978-11-27 1981-03-17 Lucerne Products, Inc. Trigger operated tool handle switch
US4328405A (en) * 1979-09-12 1982-05-04 Black & Decker Inc. Trigger switch and printed circuit board arrangement for a portable tool
US4329555A (en) * 1978-11-27 1982-05-11 Lucerne Products, Inc. Trigger operated tool handle switch
US4379214A (en) * 1981-12-28 1983-04-05 Lucerne Products, Inc. Trigger operated tool handle switch
US4553005A (en) * 1984-03-08 1985-11-12 Eaton Corporation Trigger operated electric switch
US8446120B2 (en) 2011-05-19 2013-05-21 Black & Decker Inc. Electronic switching module for a power tool
US20160301340A1 (en) * 2015-04-07 2016-10-13 Black & Decker Inc. Power tool with automatic feathering mode
US10608501B2 (en) 2017-05-24 2020-03-31 Black & Decker Inc. Variable-speed input unit having segmented pads for a power tool
US11477889B2 (en) 2018-06-28 2022-10-18 Black & Decker Inc. Electronic switch module with an integrated flyback diode

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA973942A (en) * 1972-03-01 1975-09-02 Ignacy Supel Speed control device with independent speed control and on-off operating members
CN2161978Y (zh) * 1993-02-19 1994-04-13 潘兆进 三步式新型接触器
US6099534A (en) 1997-10-01 2000-08-08 Scimed Life Systems, Inc. Releasable basket
US9498604B2 (en) 1997-11-12 2016-11-22 Genesis Technologies Llc Medical device and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE26267E (en) * 1964-03-31 1967-09-26 Electrical switch with camming bridging contact
US3456230A (en) * 1965-08-23 1969-07-15 Lucerne Products Inc Electrical switch apparatus
US3484632A (en) * 1967-01-12 1969-12-16 Arrow Hart & Hegeman Electric Variable speed controller for portable electric devices

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE26267E (en) * 1964-03-31 1967-09-26 Electrical switch with camming bridging contact
US3456230A (en) * 1965-08-23 1969-07-15 Lucerne Products Inc Electrical switch apparatus
US3484632A (en) * 1967-01-12 1969-12-16 Arrow Hart & Hegeman Electric Variable speed controller for portable electric devices

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731030A (en) * 1970-06-17 1973-05-01 Holzer Patent Ag Pushbutton switch assembly with pivotable conductive bridging member and multiple conductive path printed circuit board
US3755640A (en) * 1972-07-27 1973-08-28 Skie Corp Reversing switch for a power tool with separate selectively movable contact carriers
US4097703A (en) * 1977-08-05 1978-06-27 The Singer Company Trigger switch and lock mechanism therefore
US4097705A (en) * 1977-08-05 1978-06-27 The Singer Company Quick lock-release mechanism for a trigger switch
US4256942A (en) * 1978-11-27 1981-03-17 Lucerne Products, Inc. Trigger operated tool handle switch
US4329555A (en) * 1978-11-27 1982-05-11 Lucerne Products, Inc. Trigger operated tool handle switch
US4328405A (en) * 1979-09-12 1982-05-04 Black & Decker Inc. Trigger switch and printed circuit board arrangement for a portable tool
US4379214A (en) * 1981-12-28 1983-04-05 Lucerne Products, Inc. Trigger operated tool handle switch
WO1983002358A1 (en) * 1981-12-28 1983-07-07 Lucerne Products Inc Trigger operated tool handle switch
US4553005A (en) * 1984-03-08 1985-11-12 Eaton Corporation Trigger operated electric switch
US8446120B2 (en) 2011-05-19 2013-05-21 Black & Decker Inc. Electronic switching module for a power tool
US9000882B2 (en) 2011-05-19 2015-04-07 Black & Decker Inc. Electronic switching module for a power tool
US9401250B2 (en) 2011-05-19 2016-07-26 Black & Decker, Inc. Electronic switching module for a power tool
US9406457B2 (en) 2011-05-19 2016-08-02 Black & Decker Inc. Electronic switching module for a power tool
US9508498B2 (en) 2011-05-19 2016-11-29 Black & Decker, Inc. Electronic switching module for a power tool
US10256697B2 (en) 2011-05-19 2019-04-09 Black & Decker Inc. Electronic switching module for a power tool
US10651706B2 (en) 2011-05-19 2020-05-12 Black & Decker Inc. Control unit for a power tool
US20160301340A1 (en) * 2015-04-07 2016-10-13 Black & Decker Inc. Power tool with automatic feathering mode
US10637379B2 (en) * 2015-04-07 2020-04-28 Black & Decker Inc. Power tool with automatic feathering mode
US11398786B2 (en) * 2015-04-07 2022-07-26 Black & Decker Inc. Power tool with automatic feathering mode
US10608501B2 (en) 2017-05-24 2020-03-31 Black & Decker Inc. Variable-speed input unit having segmented pads for a power tool
US11477889B2 (en) 2018-06-28 2022-10-18 Black & Decker Inc. Electronic switch module with an integrated flyback diode
US12010799B2 (en) 2018-06-28 2024-06-11 Black & Decker Inc. Electronic switch module with oppositely-arranged power switches and discrete heat sinks

Also Published As

Publication number Publication date
FR2046172A5 (de) 1971-03-05
DE2020557C3 (de) 1974-02-14
DE2020557B2 (de) 1973-07-26
NL160423C (nl) 1979-10-15
NL160423B (nl) 1979-05-15
CH516220A (fr) 1971-11-30
NL7002246A (de) 1970-11-10
DE2020557A1 (de) 1971-02-18
BE750186A (fr) 1970-10-16
GB1298882A (en) 1972-12-06

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