EP0444907A2 - Schalter - Google Patents

Schalter Download PDF

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Publication number
EP0444907A2
EP0444907A2 EP91301607A EP91301607A EP0444907A2 EP 0444907 A2 EP0444907 A2 EP 0444907A2 EP 91301607 A EP91301607 A EP 91301607A EP 91301607 A EP91301607 A EP 91301607A EP 0444907 A2 EP0444907 A2 EP 0444907A2
Authority
EP
European Patent Office
Prior art keywords
stop
clockwise
clockwise rotation
switch
trigger element
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.)
Granted
Application number
EP91301607A
Other languages
English (en)
French (fr)
Other versions
EP0444907A3 (en
EP0444907B1 (de
Inventor
Manfred Merkator
Thomas Stanke
Robert Wache
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 Inc
Original Assignee
Black and Decker 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 Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0444907A2 publication Critical patent/EP0444907A2/de
Publication of EP0444907A3 publication Critical patent/EP0444907A3/en
Application granted granted Critical
Publication of EP0444907B1 publication Critical patent/EP0444907B1/de
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
    • 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

  • the present invention relates to a switch, particularly to a switch with a circuit arrangement for controlling the speed and for adjusting the direction of rotation of an electric motor, in particular for electric power tools, with a switch housing containing the circuit arrangement, on which switch housing a trigger element is mounted which can be moved backwards and forwards between an off-position away from the switch housing and an on-position close to the switch housing, in which switch housing there is a stop-element which can be moved in the direction of the backward-and-forward movement of the trigger element between a position for maximum speed and a position for minimum speed, which limits the movement of the trigger element in the on-position and which when adjusted for maximum speed in the setting for clockwise rotation of the electric motor lies with the inner end which faces the switch housing against a stop-face of the switch housing, as well as with a reducing pin mounted on the switch housing, which can be moved perpendicular to the movement of the trigger element between a position for anti-clockwise rotation and a position for clockwise rotation, which pin is situated, when in the position for
  • a switch of this type is the subject of an earlier design which is not part of the prior art.
  • the travel of the trigger element in the setting for clockwise rotation is greater than in the setting for anti-clockwise rotation, so that the speed in clockwise rotation is greater than in the anti-clockwise direction.
  • This is frequently important, inter alia, in the case of electric power tools, because the electric motors used are frequently wound such that they produce less radio disturbance in clockwise rotation than in anti-clockwise rotation.
  • the lower maximum speed in anti-clockwise rotation due to the shorter travel of the trigger element means that in this operating state the radio interference is no higher than in the clockwise rotation which has a higher maximum speed.
  • a reducing pin is moved so that it is situated between the inner end face of the stop element and the surface of the switch housing which serves as a stop in the clockwise rotation position.
  • the distance of travel of the trigger element at every position of the stop element in the anti-clockwise rotation position is reduced by the size of the reducing pin, in the direction of the backward-and-forward movement of the trigger element, compared with that in the clockwise-rotation position, i.e.
  • the inner end of the stop element comes to rest earlier on the reducing pin, which limits the travel by the width of the reducing pin extending in the direction of the backward-and-forward movement of the trigger element, than it does in the clockwise-rotation position in which the reducing pin is located outside the travel path of the stop element and the movement is limited by the inner end of the stop element coming to rest on the surface of the switch housing.
  • the designed switch operates very satisfactorily in the clockwise rotation setting and also in the anti-clockwise setting when the stop element is positioned for a relatively high speed.
  • the trigger element can be moved a certain distance towards the switch element and thus the desired speed can be adjusted. Difficulties occur, however, when a low speed, particularly the minimum possible speed, is to be set with this switch in the anti-clockwise position.
  • the inner end of the stop element is very close to the reducing pin, so that only an extremely short distance of travel is available for the displacement of the trigger element, which is not sufficient to permit controlled adjustment of the speed to the desired minimum value.
  • the object of the invention is to improve a switch so that the minimum speed can be controlled and can be set consistently by the displacement of the trigger element even in the anti-clockwise rotation position.
  • a switch of the type mentioned in the introduction is constructed according to the invention such that a fixed anti-clockwise rotation stop is provided on the trigger element, the inner stop-face of which, when the stop element is positioned for minimum speed, is distanced further from the switch housing than the inner face of the stop element, and that the reducing pin in the anti-clockwise position lies in the travel path of the anti-clockwise rotation stop, and that, at least in the setting for maximum speed, the trigger movement in the direction of the on-position is limited by the inner end of the anti-clockwise rotation stop coming to rest on the reducing pin.
  • the anti-clockwise rotation stop is preferably located here above the inner section of the stop element.
  • the maximum speed adjusted is limited by means of the anti-clockwise rotation stop, which is fixed on the trigger such that its position cannot be altered and in anti-clockwise rotation comes to rest on the reducing pin before the inner end of the stop-element which is set to maximum speed can touch the surface of the switch housing which serves as a stop in clockwise rotation.
  • the inner end of the stop element is used to limit this speed.
  • the inner end does not come to rest on the reducing pin, but rests on the surface of the switch housing, as is also the case in clockwise rotation, because the stop element in this setting is moved so far in the direction of the switch housing that the inner end of the stop element comes to rest on the switch housing, before the inner end of the anti-clockwise stop can touch the reducing pin. Consequently, at the minimum speed in anti-clockwise rotation, the way the clockwise rotation control functions is maintained and thus a sufficiently large distance of travel for the trigger element is also available in anti-clockwise rotation for controlling the motor between standstill and minimum speed.
  • the maximum anti-clockwise rotation speed is determined by the co-operation of the anti-clockwise rotation stop and the reducing pin, such that the inner end of the anti-clockwise stop is closer to the inner end of the reducing pin than the inner end of the stop element is to the stop face provided on the switch housing for the stop element, i.e. the inner end of the story element is in a position which corresponds to the position for maximum speed in clockwise rotation, but does not reduce this greatest possible speed for anti-clockwise rotation.
  • the latter takes place through the fixed position of the inner end of the anti-clockwise stop which, as mentioned above, comes to rest earlier on the reducing pin than the inner end of the stop element on the surface of the switch housing.
  • 'minimum speed' and 'maximum speed' refer to speeds determined by the limitation of the movement of the trigger element. In operation, therefore, speeds also occur which are lower than the "minimum speed', namely those which are produced at the beginning of the displacement movement of the trigger element. If there should be a provision for locking the trigger element, the corresponding locking position determines the 'minimum speed' and the 'maximum speed'.
  • the switch shown has a switch housing 2, in which a conventional electronic circuit and contact arrangements are situated, with which an electric motor can be driven at different speeds both in the anti-clockwise and clockwise directions.
  • a trigger element 3 is seated which can be moved against the pressure of a spring towards the switch housing (to the right in the Figures), on which trigger element a pusher rod 8 is attached which extends towards the switch housing (i.e. to the right in the Figures) and to the inner end of which sliding contacts are attached, in a manner not shown, for co-operation with the circuit elements provided in the interior of the switch housing which contacts move together with pusher rod 8 when the trigger element 3 is displaced.
  • a stop element with an inner pin-shaped section 4 and an outer rotary knob 5 is positioned in a through-hole with an interior thread, such that on rotation of the rotary knob 5 the operator can screw this stop element as required into the trigger element 3 and in this way can bring the inner end 6 of the section 4 of the stop element 4, 5 as close as required to the stop-face 7 formed by the switch housing 2.
  • a reducing pin 11 is mounted which can be moved to and fro perpendicular to the direction of the possible displacement movement of the trigger element 3, and therefore vertically in the Figures, on which a spring 16, which is attached to a pin 15 on the switch housing 2, acts with a force directed upwards in the Figures.
  • the upper end of the reducing pin 11 is chamfered ( Figures 5 and 6), and, in the position for clockwise rotation, this pin projects above an upper face of the switch housing 2 ( Figure 5).
  • On this face is the inner section of the adjusting lever 13, which is mounted rotatably on the switch housing 2, so that the operator can pivot it by moving the handle 14 between a position for clockwise rotation and a position for anti-clockwise rotation.
  • the adjusting lever 13 effects a switchover in a usual manner, not shown, e.g. by rotation of the armature by means of a di-polar reversing switch, through which the direction of rotation of the electric motor is switched between clockwise and anti-clockwise.
  • an oblong anti-clockwise stop 9 is provided, which can, for example, be constructed in one piece with the pusher rod 8, and the lower face of which is adjacent to the upper face of the inner section 4 of the stop element 4,5.
  • the inner section 4 of the stop-element 4,5, the anti-clockwise stop 9 and the reducing pin 11 lie somewhat higher, relative to the planes of projection in Figures 1 to 4, than the pusher rod 8, so that these are situated behind the reducing pin 11 and behind the inner section 4 of the stop element 4,5 and can be moved, unimpeded by this, together with the trigger element 3.
  • the direction of rotation of the electric motor to be controlled by the switch depends on the position of the adjusting lever 13.
  • the speed of the electric motor is determined by the position of the trigger element 3 with regard to the switch housing. In the positions in Figures 1 to 4, the trigger element 3 is situated in the off-position at the greatest distance from the switch housing 2. If the trigger element 3 is moved out of this position towards the switch housing 2 against the spring pressure, i.e. to the right in the Figures, the electric motor is energised, and the further the trigger element 3 is displaced in this direction, the more its speed increases.
  • the trigger element 3 can be moved into the switch housing 2 to the point at which the inner end 6 of the stop element 4,5 lies against the stop face 7 of the switch housing 2.
  • the stop element 4,5 is screwed further out of the trigger element 3 than in the position shown in Figure 2.
  • the stop element 4,5 is in the maximum screwed out position, so that there is a maximum distance of travel for the trigger element 3 and thus a maximum speed can be achieved.
  • the stop element 4,5 is screwed as far as possible into the trigger element 3, i.e.
  • the inner end 6 of the stop element 4,5 is situated when the trigger element 3 is in the off-position appreciably less distant from the stop-face 7 of the switch housing 2 than in the position in Figure 1.
  • the travel of the trigger element 3 is shortened and in this position it is possible to set the minimum speed of the electric motor.
  • the lower end of the reducing pin 11 lies above the inner section 4 of the trigger element 4,5 and also above the anti-clockwise rotation stop 9, so that the distances of travel of the trigger element 3 with the pusher rod 8 and stop element 4,5 are not impaired by the reducing pin 11.
  • the maximum anti-clockwise rotation speed of the electric motor is clearly lower than the maximum clockwise rotation speed, in order, inter alia, to keep the radio interference, which is more marked in anti-clockwise rotation, below the pre-set limits.
  • the trigger element 3 can thus be moved, when in this position, in the same way as when in the corresponding position for clockwise rotation, until the inner end 6 of the stop element 4,5 hits the stop face 7 of the switch housing 2, in order to energise the electric motor corresponding to the minimum speed determined by this position, and the distance of travel available enables the electric motor to be brought up to this minimum speed in a controlled manner.

Landscapes

  • Portable Nailing Machines And Staplers (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
EP91301607A 1990-03-01 1991-02-27 Schalter Expired - Lifetime EP0444907B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4006466 1990-03-01
DE4006466A DE4006466A1 (de) 1990-03-01 1990-03-01 Schalter

Publications (3)

Publication Number Publication Date
EP0444907A2 true EP0444907A2 (de) 1991-09-04
EP0444907A3 EP0444907A3 (en) 1992-01-08
EP0444907B1 EP0444907B1 (de) 1994-12-14

Family

ID=6401220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91301607A Expired - Lifetime EP0444907B1 (de) 1990-03-01 1991-02-27 Schalter

Country Status (2)

Country Link
EP (1) EP0444907B1 (de)
DE (2) DE4006466A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0585541A3 (de) * 1992-07-31 1994-11-17 Marquardt Gmbh Elektrischer Schalter zur Drehzahlregulierung von Motoren.

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19636873A1 (de) * 1996-09-11 1998-03-12 Juergen Schmid Elektrische Handschleifmaschine
DE102006060880A1 (de) * 2006-12-22 2008-06-26 Metabowerke Gmbh Elektrohandwerkzeuggerät

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3590194A (en) * 1969-09-19 1971-06-29 Skil Corp Contact- and circuit-mounting board for trigger-operated switch unit
US3742364A (en) * 1971-10-22 1973-06-26 Lucerne Products Inc Reversing switch lever
US3755640A (en) * 1972-07-27 1973-08-28 Skie Corp Reversing switch for a power tool with separate selectively movable contact carriers
DE2444739C3 (de) * 1974-09-19 1984-03-15 Scintilla Ag, Solothurn Vorrichtung zur Drehzahlsteuerung eines in eine Handwerkzeugmaschine eingebauten Elektromotors
US4097705A (en) * 1977-08-05 1978-06-27 The Singer Company Quick lock-release mechanism for a trigger switch
DE2847140C2 (de) * 1978-10-30 1980-12-04 Siemens Ag, 1000 Berlin Und 8000 Muenchen In eine Gehäuseöffnung, insbesondere eines Spielzeugtransformators, von außen eingesteckter Drehknopf
DE2920066C2 (de) * 1979-05-18 1984-09-27 Metabowerke GmbH & Co, 7440 Nürtingen Elektrohandgerät mit einem für eine Drehrichtung optimierten Universalmotor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0585541A3 (de) * 1992-07-31 1994-11-17 Marquardt Gmbh Elektrischer Schalter zur Drehzahlregulierung von Motoren.

Also Published As

Publication number Publication date
EP0444907A3 (en) 1992-01-08
EP0444907B1 (de) 1994-12-14
DE69105776T2 (de) 1995-04-27
DE4006466A1 (de) 1991-09-05
DE69105776D1 (de) 1995-01-26

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