EP0369221B1 - Elektrischer Schalter für ein elektrisches Handwerkzeug - Google Patents

Elektrischer Schalter für ein elektrisches Handwerkzeug Download PDF

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Publication number
EP0369221B1
EP0369221B1 EP89119887A EP89119887A EP0369221B1 EP 0369221 B1 EP0369221 B1 EP 0369221B1 EP 89119887 A EP89119887 A EP 89119887A EP 89119887 A EP89119887 A EP 89119887A EP 0369221 B1 EP0369221 B1 EP 0369221B1
Authority
EP
European Patent Office
Prior art keywords
electrical switch
switch according
axis
housing
bolt
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
EP89119887A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0369221A2 (de
EP0369221A3 (de
Inventor
Günter Berger
Gerd Dipl.-Ing. Berner
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0369221A2 publication Critical patent/EP0369221A2/de
Publication of EP0369221A3 publication Critical patent/EP0369221A3/de
Application granted granted Critical
Publication of EP0369221B1 publication Critical patent/EP0369221B1/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

Definitions

  • the invention relates to an electrical switch for an electrical hand tool according to the preamble of the main claim.
  • Shifting with all fingers together is less sensitive than shifting with the single finger.
  • the new switch which can be operated with less sensitivity, is intended for rough, professional use on construction sites, in which work gloves are predominantly used.
  • the storage or guidance of the known switch which requires special sensitivity, is unsuitable for the new applications described.
  • the electrical switch for an electrical hand tool with the characterizing features of claim 1 offers the advantage of a robust, simple construction from a few individual parts.
  • the switch is also easy to install and insensitive to dust, the latter resulting from rounded shapes and avoiding the edges and angles of the guides and the guided parts: dust and dirt only offer small areas of attack. Any adhering dirt can easily be removed due to the frictional forces in the guides.
  • Figure 1 shows in side view and partially. in the vertical longitudinal section the switch in the starting position.
  • Figure 2 shows the guide body of the switch,
  • Figures 3, 4, 5 and 6 each show the view of an embodiment of the pivot axis of the switch.
  • the electrical switch 1 provided for an electrical hand tool has a known switching mechanism 2, which is not shown in its details.
  • a tiltable plunger 3 bent in the tilting direction is the switching element of the switching mechanism 2 and is mounted in the latter. With its free end 4, the plunger 3 is guided over a first guide pin 5 between horizontal guide strips 6 of an actuating member 7.
  • the actuator 7 is a one-armed lever, which is designed in cross section as a U-profile. At its ends, the actuator 7 is provided with parallel through holes 8, 9. At one end, an axle pin 10 is mounted in the bores 8 and a second guide pin 11 is mounted essentially parallel to this at the other end in the bores 9. Adjacent to the axle pin 10, a bearing pin 13 is mounted in bores 14 at a distance on the housing 12 of the switch 1. An annular eyelet 15 is rigidly connected to the bearing pin 13 and the axle pin 10 with these.
  • a first and a second return spring 16, 17 are arranged, which are mounted on pins 18.
  • the first return spring 16 is arranged transversely with respect to its line of action of force
  • the second return spring 17 is arranged parallel to the longitudinal axis of the actuating member 7.
  • a guide body 19 is arranged on the housing 12 adjacent to the second guide pin 11 at the end of the actuating member 7.
  • the guide body 19 is shown enlarged, which is provided with a substantially vertically symmetrical, z-profile-shaped recess 20.
  • the recess 20 is supplemented by a vertical first and second extension 21, 22 directed towards the inside of the guide body 19.
  • the Z profile thus has an indicated meandering shape with protruding first and second webs 23, 24, the recess 20 being designed with only rounded edges.
  • the webs 23, 24 are provided on the extensions 21, 22 facing sides with indents 23 ', 24'.
  • the recess 20 is open to the outside via a slot 25 tapering in the direction of the recess 20 and is accessible for mounting the second guide bolt 11, which is already connected to the actuating member 7.
  • the slot 25 is narrower than the diameter of the second guide pin 11, which can be inserted into the slot by pressing without a tool, but can only be guided out of the recess 20 with a tool.
  • the operating procedures in and at switch 1 are as follows: Several fingers of a hand, not shown, encompass the actuating member 7, the thumb being supported on the opposite part of the electrical hand tool, which is also not shown. Upon a closing movement of the fingers, the actuating member 7 is pivoted about the axle pin 10 and the bearing pin 13. The second guide pin 11 in the recess 20 in the guide body 19 moves essentially perpendicularly to the switch housing 12 until it strikes the end of the first extension 21. The path of the second guide pin 11 to be covered is structurally fixed to a few millimeters. Moving the actuator 7 in this position is not possible. This must first be moved back into the starting position, which is caused by the first return spring 16 when the actuating force decreases.
  • the switching movement described corresponds to an unwanted switching on of the hand tool and, as described, is prevented, which implements a switch-on lock.
  • the actuating member 7 When the intended switch-on, the actuating member 7 must first be moved parallel to its longitudinal axis against the force of the second return spring 17 until the second guide pin 11 crosses the web 23 and has reached the longer part of the recess 20. Only then can the actuator 7 apply a vertical actuating force counter to the force of the first return spring 16 to carry out the full switching stroke until the guide pin 11 strikes within the longer piece of the recess 20 at its housing end.
  • the pivoting movement of the actuating member 7 is followed by the first guide pin 5 mounted between the guide strips 6 together with the plunger 3 and thereby triggers the switching mechanism 2 to be switched on.
  • the actuating member 7 must perform a further displacement movement against the force of the second return spring 17 parallel to its longitudinal axis. If the actuating member 7 is then moved back in the direction of the starting position and the action of the first return spring 16, the second guide pin 11 can snap into the second extension 22, the second web 24 preventing the guide pin 11 and thus the actuating member 7 from being returned to the initial position . This creates a shutdown lock against unintentional shutdown.
  • the indents 23 ', 24' are provided on the webs 23, 24, which come into effect for both possible mounting positions of the guide body 19 in the switch-on position: when the switch-on position, the actuating member 7 is moved in the direction of the housing 12 , A horizontal movement against the force of the return spring 17 is forced via the feed 23 'or 24' and the second guide pin 11. This inhibiting force determines the additional effect of the switch-off lock.
  • the switch-on lock is released by pivoting the actuating member 7 by a full remaining stroke in the actuating direction.
  • the actuating member 7 can automatically return to the starting position.
  • the actuating element 7 tilts the plunger 5 into the switched-off position of the switching mechanism 2. Due to the swing-like suspension of the axle pin 10, the pivoting movement of the actuating member 7 can be superimposed on a horizontal displacement movement, the path of which is limited by the diameter of the eyelet 15. If the eyelet 15 is irregularly curved or has an elliptical shape, its largest diameter determines the maximum displacement at one end of the actuating member.
  • the diameter of the eyelet 15 is matched to the maximum displacement path predetermined by the Z profile in the guide body 19.
  • the guide body 19 ensures a particularly smooth-running, self-cleaning function, particularly in a form-elastic design, for example made of PVC, due to a minimal surface size of the leading and guided parts.
  • the guide body 19 can also be used when installed, rotated by 180 degrees about the longitudinal axis of the second guide pin 11.
  • a rocker 28 is arranged between the actuating member 7 and the housing 12 in a further exemplary embodiment of the switch 1.
  • This rocker 28 consists of two parallel axle bolts 29, 30 with a strut-like intermediate piece 31 rigidly connecting them to one another.
  • the axle bolt 30 facing the housing 12 is mounted in two receiving bores 14 on the housing 12.
  • a U-shaped bracket 32 consists of a curved part 33 and two 2 legs 34, arranged, the curved part 33 of which is rotatably mounted on an abutment 35 on the housing 12.
  • the upper ends of the legs 34 are preferably rectangular, bent laterally and mounted in the bores 8 of the actuator 7.
  • the bracket 32 is suspended with its part 33 on the abutment 35 in such a way that it can be freely moved in the direction of the housing 12 when the actuating member 7 is pressed.
  • spring-elastic elements are arranged which, because of the displacement movement of the actuating member 7, are designed primarily for tensile loads.
  • the resilient elements are in one case a helical spring 36, in the other case a molded part 38 made of spring steel sheet.
  • the coil spring 36 is mounted on the housing 12 on a pin 37 and on the actuating member 7 on the axle pin 10.
  • the molded part 38 is rotatably mounted on the actuator 7 by means of axle bolts 10 and on the housing 12 by means of bearing bolts 13.
  • the combination of oscillatingly rotatable guidance of the axle pin 10 with a simplified guidance of the second guide pin 11 and its cylindrical design prevents the hand tool from being switched on or off in an especially safe manner in difficult working or grip positions.
  • the guidance of the axle pin 10 is a simplified, particularly dust-compatible construction in comparison with the known sliding bearings.

Landscapes

  • Push-Button Switches (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Mechanisms For Operating Contacts (AREA)
EP89119887A 1988-11-17 1989-10-26 Elektrischer Schalter für ein elektrisches Handwerkzeug Expired - Lifetime EP0369221B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3838836A DE3838836C1 (enrdf_load_stackoverflow) 1988-11-17 1988-11-17
DE3838836 1988-11-17

Publications (3)

Publication Number Publication Date
EP0369221A2 EP0369221A2 (de) 1990-05-23
EP0369221A3 EP0369221A3 (de) 1991-09-11
EP0369221B1 true EP0369221B1 (de) 1994-09-28

Family

ID=6367305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89119887A Expired - Lifetime EP0369221B1 (de) 1988-11-17 1989-10-26 Elektrischer Schalter für ein elektrisches Handwerkzeug

Country Status (3)

Country Link
EP (1) EP0369221B1 (enrdf_load_stackoverflow)
JP (1) JP2783621B2 (enrdf_load_stackoverflow)
DE (2) DE3838836C1 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4407418C2 (de) * 1994-03-03 1998-02-19 Black & Decker Inc Schalteranordnung, insbesondere für eine Oberfräse
DE10355102B3 (de) * 2003-11-24 2005-08-04 Itw-Befestigungssysteme Gmbh Schalter mit verriegelbarer Schaltwippe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3564186A (en) * 1968-09-04 1971-02-16 Toro Mfg Corp Switch control mechanism
DE2315841C3 (de) * 1973-03-30 1981-11-19 Robert Bosch Gmbh, 7000 Stuttgart Im Handgriff einer elektromotorisch angetriebenen Handwerkzeugmaschine angeordnete Betätigungsvorrichtung
US3854020A (en) * 1973-06-29 1974-12-10 Black & Decker Mfg Co Trigger mechanism for hand-operated power device including stationary locking device which provides lock-off and lock-on operation
IT7922984U1 (it) * 1979-10-29 1981-04-29 Star Utensili Elett S P A Utensile elettrico portatile con comandi perfezionati.
DE3638952A1 (de) * 1986-11-14 1988-05-26 Marquardt Gmbh Elektrischer schalter

Also Published As

Publication number Publication date
EP0369221A2 (de) 1990-05-23
JPH02189826A (ja) 1990-07-25
JP2783621B2 (ja) 1998-08-06
EP0369221A3 (de) 1991-09-11
DE3838836C1 (enrdf_load_stackoverflow) 1990-05-10
DE58908448D1 (de) 1994-11-03

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