EP0223968B1 - Elektrischer Drehschalter - Google Patents

Elektrischer Drehschalter Download PDF

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Publication number
EP0223968B1
EP0223968B1 EP86113240A EP86113240A EP0223968B1 EP 0223968 B1 EP0223968 B1 EP 0223968B1 EP 86113240 A EP86113240 A EP 86113240A EP 86113240 A EP86113240 A EP 86113240A EP 0223968 B1 EP0223968 B1 EP 0223968B1
Authority
EP
European Patent Office
Prior art keywords
circuit board
ratchet wheel
printed circuit
rotary
plate structure
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
EP86113240A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0223968A2 (de
EP0223968A3 (en
Inventor
Jürgen Wolf
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.)
Braun GmbH
Original Assignee
Braun 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 Braun GmbH filed Critical Braun GmbH
Publication of EP0223968A2 publication Critical patent/EP0223968A2/de
Publication of EP0223968A3 publication Critical patent/EP0223968A3/de
Application granted granted Critical
Publication of EP0223968B1 publication Critical patent/EP0223968B1/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
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/54—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand the operating part having at least five or an unspecified number of operative positions
    • H01H19/56—Angularly-movable actuating part carrying contacts, e.g. drum switch
    • H01H19/58—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch
    • H01H19/585—Angularly-movable actuating part carrying contacts, e.g. drum switch having only axial contact pressure, e.g. disc switch, wafer switch provided with printed circuit contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H19/02—Details
    • H01H19/10—Movable parts; Contacts mounted thereon
    • H01H19/11—Movable parts; Contacts mounted thereon with indexing means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H19/00—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand
    • H01H2019/008—Switches operated by an operating part which is rotatable about a longitudinal axis thereof and which is acted upon directly by a solid body external to the switch, e.g. by a hand with snap mounting of rotatable part on fixed part, e.g. rotor on stator, operating knob on switch panel

Definitions

  • the invention relates to an electrical rotary switch.
  • the invention is based on an electrical rotary switch, as is known from DE-AS 20 36 775. It consists of a rotary knob, two contact bridges, a printed circuit board, a compression spring and a washer. In the assembled state of the rotary switch, the spring pulls the pin downward away from the circuit board via the disk, so that the contact bridges are pressed resiliently against the circuit board by the rotary knob.
  • balls formed at both ends of the contact bridges and the two-part design result in expensive manufacture of the contact bridges, which have to be produced either as turned parts or as molded parts.
  • the object of the invention is to provide an electric rotary switch according to the preamble of claim 1, which has as few components as possible, each with a small footprint, which is quick and easy to assemble and which is still easy to use with high functional reliability and always works reliably.
  • the plate element according to the invention secures and guides the switching wheel without play on the circuit board, fixes the contact bridges between the switching wheel and the circuit board and gives the switching wheel the desired raster effect.
  • the rotary switch can be easily assembled or disassembled by hand without the need for additional tools.
  • the contact bridges are pressed sufficiently firmly against the circuit board by the ratchet wheel and at the same time the torque on the ratchet wheel required to drive over the latching elements remains within acceptable limits.
  • the spring force of the plate element is determined by the thickness, the material and the geometrical dimensions of the plate element, with the last feature, when using the largest possible spring arms, particularly soft spring characteristics can be achieved on the plate element.
  • a defective rotary switch can also be replaced without renewing the circuit board.
  • the resilient tongue acting on the switching wheel on the one hand secures the plate element against rotation and on the other hand always brings the switching wheel into a precisely predetermined grid position when the rotary switch is turned. In addition, it enables a completely play-free turning of the ratchet wheel, which automatically snaps into the next switching position after bridging a recess without having to be readjusted by hand. When the rotary switch is actuated, the circuit board is ultimately unaffected by switching forces.
  • the tongue extending away from the plate element is essentially L-shaped in cross section and that of the longer one Leg of the tongue is curved at right angles and parallel to the ratchet wheel to the ratchet wheel in such a way that it snaps into each recess of the ratchet wheel without play (claim 3).
  • the turning forces on the ratchet wheel are kept particularly low when one or more locking recesses are bridged, and yet an automatic rotation of the ratchet wheel is prevented.
  • a sheet metal tab is advantageously formed on the edge opposite the tongue on the plate element and engages in a depression formed on the circuit board (claim 4).
  • the preload of the plate element with respect to the printed circuit board and the pin can be increased further in that the plate element has projections which are directed towards the underside of the printed circuit board and lie there (claim 5).
  • the plate element is therefore biased by both the tongue and the projections. In this way, among other things, the plate element is pressed relatively evenly against the pin, whereby a good bending stress distribution of particularly thin-walled material is also achieved.
  • a long service life of the rotary switch is achieved when using a spring steel sheet, the thickness of which is such that the locking element can be easily moved from one locking recess into another by turning the switching wheel (claim 6).
  • the axial length of the rotary switch is only slightly increased by a particularly thin spring steel sheet.
  • the plate element can be produced particularly inexpensively and simply using the stamping and bending method.
  • the contact bridge is arranged in a recess formed on the ratchet wheel is, the edge limits the contact bridge with little play and that in the assembled state of the rotary switch, the circuit board secures the contact bridge in the recess of the switching wheel against falling out (claim 7).
  • This arrangement makes it possible to dispense with additional holding means for the contact bridge.
  • two stops limiting the rotation of the switching wheel are formed on the upper side facing away from the printed circuit board, which with a, in the housing arranged, engaging between the two stops, further stop can be brought into operative connection (claim 9).
  • the housing can be part of a coffee machine or other electrical device, for example.
  • a driver arrangement is formed on the top of the ratchet wheel, which serves to receive and fasten a rotary knob and that the rotary knob penetrates the housing to the outside (claim 10).
  • the two-part design of the rotary knob and ratchet wheel means that different materials can be selected for these parts according to their function and that the housing can be removed from the base of the machine after the rotary knob has been removed.
  • the electrical rotary switch 1 is formed in a housing 2, which is part of a coffee machine, for example, below a housing wall 3.
  • the electric rotary switch 1 consists of a switching wheel 4, a plate element 5 and a contact bridge 6.
  • the switching wheel 4 corresponds to the shape of a circular disk which is formed in the drawing above a printed circuit board 7 and which runs essentially parallel to the latter.
  • Electrically conductive switching paths are printed on the surface 8 of the printed circuit board 7 and are connected to at least one control circuit attached to the surface 8 of the printed circuit board 7.
  • the control circuit is also not shown in the drawing.
  • blind hole 10 On the upper side 9 of the ratchet wheel 4 opposite the housing wall 3 there is a blind hole 10 which runs concentrically to the ratchet wheel 4 and runs perpendicular to the upper side 9 in the drawing downwards.
  • the cross section of the blind bore 10 is essentially rectangular and has a radially outwardly extending recess 12 on one of its longer side surfaces 11.
  • the blind hole 10 serves to receive a pin formed on a rotary knob, which, like the rotary knob, is not shown in the drawing.
  • the pin protrudes upward out of the housing 2 via a bore 13 formed in the housing wall 3, which runs concentrically to the blind bore 10, and is connected to the manually operated rotary knob.
  • a catch element which is formed on the pivot of the rotary knob but not shown, engages in the recess 12, as a result of which the position of the rotary knob relative to the housing 2 and the rotary switch 1 is clearly determined.
  • On the top 9 two stops 14, 15 are formed on the peripheral edge of the ratchet wheel 4, which extend upwards in the drawing and which are at the same radius at a predetermined angle from each other.
  • a stop 16 formed on the housing 2 engages in the annular space formed between the two stops 14, 15 and extends from the housing wall 3 downward in the drawing.
  • a blind pin 17, which runs concentrically to the blind hole 10 and adjoins the blind hole 10 in the drawing downward, penetrates a through hole 18 formed on the printed circuit board 7 and is centered in the through hole 18.
  • the pin 17 tapers over the ring step 19 such that an annular groove 20 is formed on the pin 17.
  • the width of the annular groove 20 is not much greater than the thickness of the plate element 5.
  • the annular groove 20 is adjoined at the bottom by a pin 17 with a substantially rectangular cross section, the largest outer diameter 22 of which corresponds to the largest outer diameter of the pin 17 .
  • the distance between the two side surfaces 23, 24 is just as large as the distance between the two side surfaces 25, 26 of the bore 27 formed in the plate element 5 according to FIG. 4.
  • the cross section of FIG Bore 27 according to FIG. 4 corresponds to the outer dimension of section 21 according to FIG. 5, it is only slightly larger than section 21, so that section 21 can be passed through bore 27.
  • the section 21 thus forms, with the bore 27 and the plate element 5, the bayonet catch of the rotary switch 1.
  • the diameter of the annular groove 20 according to FIG. 1 almost corresponds to the width of the section 21, measured over the shortest length of the two side surfaces 23, 24 according to FIG. 5.
  • the plate element 5 is centered in the annular groove 20 over the two side surfaces 25, 26.
  • the section 21 is arranged below the plate element 5 in the drawing and rests with its contact surface 28 on the underside 29 of the plate element 5.
  • the plate element 5 is essentially trapezoidal in plan view.
  • a sheet metal tab 30 is formed on the plate element 5 according to FIGS. 1 and 4, which extends vertically upward to the plate element according to FIG. 1 and which engages in a slot 31 adapted to the sheet tab 30 in the printed circuit board 7 .
  • a tongue 32 of L-shaped cross section is formed according to FIGS. 1 and 4, which penetrates an upward hole 33 in the circuit board 7 in cross section in the drawing. 1, 2 and 4, rectangular sheet metal strips 36, 37 are formed laterally on both sides on the longer leg 34, which are delimited by the side walls 38, 39 of the bore 33.
  • the side walls 38, 39 serve to prevent the plate element 5 from tipping sideways.
  • a shorter leg 40 adjoins the longer leg 34 at right angles and runs to the right in the drawing according to FIG. 1.
  • the shorter leg 40 forms the foot of the L-shaped tongue 32.
  • the foot 40 is arched upward according to FIG. 2 and engages in a recess 42 which is formed in cross-section and is V-shaped in the cross section V-shaped. 2 and 5, a plurality of serrated elevations 43 of the same dimensions are integrally formed on the underside 41 of the switching wheel 4 on the radially outer edge, between which the recesses 42 are located.
  • the recesses 42 provide the latching action with the foot 40 when the rotary switch 1 is actuated.
  • the radius of the upward curvature of the foot 40 is dimensioned such that it engages in the recesses 42 without play.
  • projections 44, 45 are pressed into the plate element 5 at the upper and lower edges, which, according to FIG. 2, rest on the underside of the printed circuit board 7, as a result of which the plate element 5 is preloaded and in this area a certain distance from the printed circuit board 7 has.
  • FIG. 3 instead of the bayonet connection shown in FIG. 1, a snap connection 52 between the plate element 5 and the switching wheel 4 is shown.
  • the pin 17 is slotted at its free end, so that the webs 53, 54 formed thereby are pressed radially inwards in a spring-like manner when the pin 17 is pressed into the circular bore formed in the plate element 5.
  • the webs 53, 54 return to their starting position, so that the locking lugs 56, 57 engage behind the plate element 5 from below.
  • a positive connection between the switching wheel 4 and the plate element 5 is achieved in a simple manner.
  • the assembly of the rotary switch 1 is as follows.
  • the switching wheel 4 is held so that the underside 41, as shown in FIG. 5, comes to lie upwards.
  • the contact bridge 48 is now inserted into the pocket 46, as shown in FIG. 1.
  • the circuit board 7 is placed on the ratchet 4, the pin 17 penetrating the through hole 13.
  • the plate element 5 with its bore 27 is placed on the section 21. It should be noted that the sheet metal tab 30 engages in the slot 31 and the tongue 32 in the bore 33.
  • the plate element 5 is pushed onto the pin 17 until the bore 27 has reached the height of the annular groove 20.
  • the switching wheel 4 is rotated and the section 21 now projects beyond the side surfaces 25, 26.
  • the assembly of the rotary switch 1 has ended.
  • the plate element 5 is prestressed via the annular groove 20 such that the shorter leg 40 and the contact tabs 50, 51 are pretensioned on the switching wheel 5 or on the surface 8 of the printed circuit board 7 concerns. If the circuit board 7 is then installed with the rotary switch 1 in the housing 2, it must be ensured that the stop 16 engages between the two stops 14, 15. This limits the angle of rotation of the rotary switch 1, so that on the one hand the plate element 5 can never be detached from the pin 17 and on the other hand only the switch positions provided for the rotary switch 1 can be set. Because of the relatively large lever arm, when the rotary switch 1 is turned, the tongue 32 slides relatively easily from one to the other recess 42.
  • the contact tabs 50, 51 are also designed as resilient tongues, they always slide with a constant contact force on the surface 8 of the Printed circuit board 7, whereby a spark formation is largely avoided.
  • the contact force of the contact lugs 50, 51 is additionally influenced by the spring force of the plate element 5.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
EP86113240A 1985-10-30 1986-09-26 Elektrischer Drehschalter Expired - Lifetime EP0223968B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853538546 DE3538546A1 (de) 1985-10-30 1985-10-30 Elektrischer drehschalter
DE3538546 1985-10-30

Publications (3)

Publication Number Publication Date
EP0223968A2 EP0223968A2 (de) 1987-06-03
EP0223968A3 EP0223968A3 (en) 1989-06-14
EP0223968B1 true EP0223968B1 (de) 1992-04-22

Family

ID=6284789

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86113240A Expired - Lifetime EP0223968B1 (de) 1985-10-30 1986-09-26 Elektrischer Drehschalter

Country Status (4)

Country Link
US (1) US4739138A (enExample)
EP (1) EP0223968B1 (enExample)
CA (1) CA1284163C (enExample)
DE (2) DE3538546A1 (enExample)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6940488B1 (en) 1994-01-06 2005-09-06 Microsoft Corporation System and method of adjusting display characteristics of a displayable data file using an ergonomic computer input device
US5473344A (en) * 1994-01-06 1995-12-05 Microsoft Corporation 3-D cursor positioning device
US7322011B2 (en) * 1994-01-06 2008-01-22 Microsoft Corporation System and method of adjusting display characteristics of a displayable data file using an ergonomic computer input device
US5464794A (en) * 1994-05-11 1995-11-07 United Microelectronics Corporation Method of forming contact openings having concavo-concave shape
US5912661A (en) * 1997-01-14 1999-06-15 Microsoft Corp. Z-encoder mechanism
US6596950B2 (en) 2001-09-10 2003-07-22 Illinois Tool Works Inc. Rotary switch
CN1902976B (zh) 2003-11-12 2010-06-16 捷讯研究有限公司 在数据服务中具有减少的延迟的能够使用数据的网络优先化
KR20090028944A (ko) * 2007-09-17 2009-03-20 삼성전기주식회사 회전형 입력장치
CN101599383B (zh) * 2009-07-03 2011-01-12 浙江中讯电子有限公司 旋转开关

Citations (1)

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Publication number Priority date Publication date Assignee Title
DE2036775B2 (de) * 1970-07-24 1972-06-29 Kunststofftechnik Buck & Assion oHG, 7O36Schönaich Drehschalter zum wahlweisen umschalten von geraeten auf zwei spannungsbereiche

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US2896033A (en) * 1955-01-27 1959-07-21 Daystrom Inc Printed circuit assembly
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Publication number Priority date Publication date Assignee Title
DE2036775B2 (de) * 1970-07-24 1972-06-29 Kunststofftechnik Buck & Assion oHG, 7O36Schönaich Drehschalter zum wahlweisen umschalten von geraeten auf zwei spannungsbereiche

Also Published As

Publication number Publication date
US4739138A (en) 1988-04-19
CA1284163C (en) 1991-05-14
EP0223968A2 (de) 1987-06-03
DE3538546C2 (enExample) 1987-12-17
DE3684994D1 (de) 1992-05-27
DE3538546A1 (de) 1987-05-07
EP0223968A3 (en) 1989-06-14

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