EP0440056A2 - Boîtier pour un module à micro-interrupteur - Google Patents

Boîtier pour un module à micro-interrupteur Download PDF

Info

Publication number
EP0440056A2
EP0440056A2 EP91100639A EP91100639A EP0440056A2 EP 0440056 A2 EP0440056 A2 EP 0440056A2 EP 91100639 A EP91100639 A EP 91100639A EP 91100639 A EP91100639 A EP 91100639A EP 0440056 A2 EP0440056 A2 EP 0440056A2
Authority
EP
European Patent Office
Prior art keywords
housing
housing according
microswitch
microswitch assembly
side wall
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.)
Withdrawn
Application number
EP91100639A
Other languages
German (de)
English (en)
Other versions
EP0440056A3 (en
Inventor
Klaus Dipl.-Ing. Hauk
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.)
Deere and Co
Original Assignee
Deere and Co
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 Deere and Co filed Critical Deere and Co
Publication of EP0440056A2 publication Critical patent/EP0440056A2/fr
Publication of EP0440056A3 publication Critical patent/EP0440056A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H21/00—Switches operated by an operating part in the form of a pivotable member acted upon directly by a solid body, e.g. by a hand
    • H01H21/02—Details
    • H01H21/18—Movable parts; Contacts mounted thereon
    • H01H21/22—Operating parts, e.g. handle
    • H01H21/24—Operating parts, e.g. handle biased to return to normal position upon removal of operating force
    • 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
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings

Definitions

  • the invention relates to a housing for a microswitch assembly.
  • microswitch assemblies are, for example, by the companies Cherry and Honeywell with branches in D-8572 Auerbach / Opf. or sold in D-6050 Offenbach under the name Micro Switch or miniature basic switch. It is inexpensive mass-produced articles that can be mechanically loaded and used in many different ways. The special thing about these switches is that they have a high switching capacity of up to 25 A despite relatively small sizes (for example 30 mm x 20 mm x 10 mm).
  • the switches mentioned do not have a sealed housing, so that they are not immediately suitable for every location. Rather, the locations must be selected so that the switches are protected from environmental influences, such as dust and splash water, if they are to be used in a rough environment.
  • switches for reasons of cost, it is desirable to use such switches in tractor construction.
  • switches for the operation or control of the individual functions, such as. B. Handbrake, PTO, door contact, MFWD forced switching, brake light.
  • the switches must be adapted to the different locations to protect them from dust and splash water.
  • microswitch assembly with high switching capacity, which is inexpensive to manufacture, allows versatile use of the switch and seals the inside of the switch against environmental influences such as dust and splash water.
  • the object is achieved according to the invention by the use of a two-part housing made of plastic, which encloses the microswitch assembly sealingly against environmental influences, which has centering means for fixing the microswitch assembly and which contains bushings for electrical lines and at least one mechanical actuating device.
  • the housing halves can be manufactured inexpensively by spraying and designed so that they allow the microswitches to be used in a variety of ways, without additional protective measures against environmental influences having to be taken.
  • the encapsulation only slightly enlarges the switching element. By providing such an encapsulated microswitch, it is no longer necessary to use different switches for different installation locations, since the encapsulated switching element now also has the required tightness in addition to the small, compact design and the high switching capacity.
  • the microswitch assembly is inserted into one half of the housing and clamped in with the other half of the housing. It is not necessary to screw or glue the microswitch assembly inside the housing, since the position is ensured by centering means.
  • the switching element of the microswitch assembly can be influenced and the switch triggered by means of an actuating device guided through the housing wall.
  • the housing is made of PA 6.6 (glass fiber reinforced polyamide).
  • At least one centering pin which engages in a fastening recess of the microswitch assembly, is expediently formed as a centering means in a housing part.
  • the centering pins can be relatively short stubs.
  • pockets in the area of at least two opposite corners of the essentially cuboid housing, which partially enclose the opposite corners of the essentially rectangular microswitch assembly and thus clamp the microswitch assembly.
  • these pockets are preferably in the corners, in the area of which the fastening means of the housing and, if appropriate, the fastening recesses of the microswitch assembly are also located.
  • Fastening means for example through-holes, are preferably provided on the exterior of the housing at locations that are in the vicinity of the centering means for the microswitch assembly. Since the microswitch assemblies are usually stiffened in the area of their mounting recesses, this measure has the advantage that the microswitch assembly absorbs part of the forces acting on the housing, so that the housing is relieved and accordingly needs to be less rigid.
  • Two elongated holes are expediently provided as fastening means, which are located in regions of diametrically opposite corners of the essentially cuboid housing.
  • the cross section of these holes is preferred larger than the diameter of the mounting recess of the microswitch. This enables the use of larger screws than is possible when the microswitch is installed directly.
  • This design is advantageous under those assembly conditions in which larger screwdrivers are usually used, such as in vehicle assembly, in particular the assembly of agricultural tractors. There is no need to use small screwdrivers here. Rather, the tool usually used for assembly can also be used to fasten the microswitch.
  • the tightness of the interconnected housing halves can be improved in that the mutually facing sides of the housing parts form a labyrinth. It is of course also possible to glue the housing halves together.
  • a housing half serving as a lid is designed in such a way that tabs extend between its corners, perpendicular to its base area, which fit into corresponding slots in the circumferential side wall of the cup-shaped other housing half can be introduced. This training ensures good stiffening of the housing and forms a labyrinth that prevents the ingress of dust and splash water.
  • the tabs of the one housing part have outward-facing latching lugs which, in the assembled state, engage in corresponding recesses in the side wall of the other housing part.
  • the microswitch assembly is inserted into the pot-shaped housing half and the other housing half (cover) is put on. By pressing together, the two halves of the housing lock together without screwing, gluing or the like being necessary.
  • a web is formed on each of the housing halves, the web extending perpendicularly to the base of the housing half, the free end of which carries a profile which is adapted to the cross section of the electrical line. If both housing halves are joined together, the electrical line, the z. B. can consist of three adjacent individual lines, encased by the contour of the free web end sealing.
  • fastening holes of the housing do not run through molded tabs protruding beyond the housing, but are integrated into the two housing halves, it is advantageous for sealing reasons if the fastening opening of one housing half runs within and extends within a tubular extension that extends perpendicular to the base area widens towards the free end of the approach. A bead-shaped edge surrounding the fastening opening of the other housing half partially engages in the widened part of the fastening opening contained in the attachment. As a result, the housing is also sealed in the area of the fastening opening.
  • an actuating device which can be actuated from the outside and which extends through the housing wall of the housing and which triggers the switching element of the microswitch component when actuated from the outside.
  • actuating device which can be actuated from the outside and which extends through the housing wall of the housing and which triggers the switching element of the microswitch component when actuated from the outside.
  • a microswitch component a switching member protruding to one side, which is actuated by pushing in to perform an electrical switching function.
  • the actuating device preferably exits in the region of a corner of the cuboid housing. At the diametrically opposite corner of the housing there is a sealed bushing for the electrical leads of the microswitch.
  • the actuating device is expediently surrounded in the passage area by a sealing element which nestles against the passage opening in the housing.
  • the sealing element is preferably an O-ring made of rubber, which is able to compensate for tolerances, is wear-free and elastic and ensures a reliable seal even after many switching cycles.
  • the actuating device is a leaf spring which is mounted in an O-ring between the two housing halves without wear.
  • the leaf spring is an inexpensive component.
  • the leaf spring is preferably U-shaped.
  • One of her legs is inside, the other outside of the housing.
  • the legs run essentially parallel to a side wall of the housing.
  • the base of the U lies in the area of the implementation in the housing.
  • the outer leg encloses a certain angle with the side wall. If the outer leg is moved towards the side wall, the resilient inner leg bends and presses on the switching element of the microswitch assembly and triggers the desired switching function.
  • the end of the inner leg is preferably bent toward the side wall of the housing and engages in an inwardly facing groove in the side wall of the housing. As a result, the leaf spring is fixed in its position in the housing.
  • the inner leg is expediently curved, the center of curvature of the curvature being on the side of the microswitch assembly and the belly of the curvature being supported on the inner surface of the housing side wall in the rest position. This provides a defined rest position of the leaf spring.
  • the inner leg has a tongue, the free end of which lies in the area of the switching element of the microswitch assembly.
  • An actuation of the outer leg leads to a deformation of the inner leg.
  • the tongue is pressed against the switching element of the microswitch assembly without deforming itself and triggers the switching function.
  • the outer leg preferably extends approximately over the entire side length of the housing side wall. This design enables short and long switching paths to be realized when using the same housing. If a trigger mechanism attacks the outer leg of the leaf spring near the bushing, the switching distance is short. If, on the other hand, the trigger mechanism engages in the area of the free end of the outer leg, a relatively long switching path is required to trigger a switching function. Due to the special shape, the outer leg can also be operated by obliquely applied forces. The actuation of the microswitch thus requires a variable, predeterminable switching path and can be carried out in different directions with different forces. When switching, the microswitch is protected against any mechanical overload.
  • the free end of the outer leg is expediently bent and, when pressed on, adapts to the outer contour of the housing.
  • a cup-shaped housing half is shown so that the view falls into the interior of the housing.
  • the outer contour of the housing halves is essentially cuboid.
  • a circumferential side wall 12 rises above a base or outer surface 10, in the straight sections of which there are longitudinally extending slots 14 which are open at the top. Between the slots 14 and the outer contour of the housing half, recesses 16 are let in, which serve for locking with the other housing part, which will be described later.
  • a tubular extension 18 rising above the base area 10 is integrated into the side wall 12.
  • the through hole 20 is an elongated hole through which an adjustment is made possible when fastening the housing.
  • the through hole 20 widens step-like in its upper region and has a larger cross section 22 here.
  • a through opening 24 into which an O-ring 26 is sealingly inserted, which includes a leaf spring 28.
  • the fourth corner has a web 29 rising above the base area 10, the upward-pointing profile of which has semicircular recesses 30 which are adapted to the cross section of the three electrical lines 32 of the microswitch assembly 34 and serve as bushings for them.
  • the microswitch assembly 34 is shown by broken lines within the housing half. It is an essentially cuboid component with rounded corners. In the area of two opposite corners, mounting holes 36 run through the microswitch assembly 34, the diameter of which is smaller than the width of the mounting holes 20 in the housing half.
  • a switching element 38 protrudes beyond a side surface of the microswitch assembly 34 and can be pushed in, as a result of which a switching function is triggered inside the microswitch assembly 34. From two further side surfaces of the microswitch assembly 34, three connecting lugs 40 emerge, with which the electrical lines 32 are electrically connected.
  • the position of the microswitch assembly 34 is fixed within the pot-shaped housing part.
  • Centering pins 42 which are formed on the base 10 of the housing half and extend into the mounting holes 36 of the microswitch assembly 34, serve to fix the position.
  • two rounded corners of the microswitch assembly 34 nestle against pockets 44 in the lugs 18 which are formed in the shape of a semi-circle. Since the microswitch assembly 34 is stiffened in the area of its fastening holes 36 and the position of the housing part is also fixed in this area, the microswitch assembly 34 can absorb some of the forces which act on the housing half from the outside. With this design, the microswitch assembly 34 thus supports and relieves the load on the housing, which can be made correspondingly lighter.
  • the leaf spring 28 has a substantially U-shape. In the area of the base of the U, an O-ring 26 is pushed over the leaf spring 28, which is mounted in a corner of the pot-shaped housing half and forms a sealed housing passage of the leaf spring 28.
  • the outer leg 46 of the leaf spring 28 runs parallel to a side surface of the circumferential housing wall 12 and extends to the adjacent corner of the housing half. The outer leg 46 extends at an angle to the side surface in the unloaded state. By the action of a force which can act at any point on the outer leg 46 and at any angle within a large angular range, the outer leg 46 can be pressed against the side surface of the housing part.
  • the free bent end 48 of the outer leg 46 nestles against the rounded contour of the housing half, which was indicated by the illustration with broken lines.
  • the inner leg 50 of the leaf spring 28 is designed as a circular curvature 52 in its central region.
  • the center of curvature of the curvature 52 lies on the side on which the microswitch assembly 34 is located.
  • the belly of the arch is supported on the inner surface of the side wall 12 in the unloaded state.
  • the free end of the inner leg is bent in the direction of the outer leg 46 and engages in a groove 54 which is formed between an inwardly projecting nose 56 in the side wall 12 and the tubular extension 18. This enables the leaf spring 28 to be fixed in position in the housing half.
  • the leaf spring 28 is a flat spring steel strip with a width that corresponds approximately to the height of the side wall 12.
  • a longitudinally extending, essentially rectangular recess in the spring steel strip into which a tongue 58 formed on the spring steel strip in the region of the leadthrough 24 extends.
  • the tongue 58 is opposite the switching element 38 of the microswitch assembly 34.
  • the leaf spring If the outer leg 46 of the leaf spring 28 is pressed against the side wall 12 of the housing half, the leaf spring, the inner leg of which is supported with the free leg end in the groove 54 and in the region of the O-ring on the housing half, essentially deforms in the region of the curvature 52, which takes up a larger radius when loaded than when unloaded.
  • the free end of the tongue which does not participate in the deflection of the inner leg 50, moves towards the switching element 38 of the microswitch assembly 34 and presses it into the Microswitch housing, which triggers an electrical switching function.
  • the pot-shaped housing part according to FIG. 1 can be closed by a second housing part, which is referred to as a cover.
  • the lid is shown with its view into the interior of the housing in Fig. 2.
  • tabs 62 rise along the side edges, the position, width, length and height of which are dimensioned such that the tabs 62 can be inserted into the corresponding slots 14 in the pot-shaped housing half.
  • the tabs 62 serve to stiffen the cover, so that the base area of the second housing half can be made relatively thin.
  • the tabs 62 have outwardly projecting latching lugs 64 which engage in the recesses 16 of the side wall 12 of the other housing half during assembly, as a result of which both housing halves are firmly connected to one another.
  • mounting hole 66 In two opposite corners of the cover there is a mounting hole 66, the position and size of which corresponds to the mounting holes 20 of the other housing half.
  • the mounting holes 66 are each surrounded by an upwardly projecting bead-shaped edge 68 which, in the assembled state, engages in the enlarged cross section 22, to which the mounting holes 20 of the other housing half expand. This step-like design ensures a good seal of the housing halves against each other.
  • protrusions 70, 72 rise above the base surface, which serve to surround the O-ring mounted in the other housing half.
  • an area 74 projecting beyond the base area 60 is provided. That after The top-facing profile of this area 74 is designed such that it matches the upward-pointing profile of the web 29 of the other housing half and only leaves through openings whose cross-sections correspond to the cross-sections of the electrical lines 32 of the microswitch assembly 34.
  • FIG. 3 shows a cross section of a part of the housing according to the invention which runs through the latched housing halves and runs along the line 3 - 3 in FIGS. 1 and 2.
  • a recess 16 can be seen in the housing wall 12 of the cup-shaped housing part, into which a locking lug 64 formed on the tab 62 of the cover-shaped housing part engages.
  • the assembled housing can be attached to any device using screws.
  • the screws are inserted through the mounting holes 20, 66.
  • the two housing halves are pressed together by the screws, which further increases the tightness between the two housing halves.

Landscapes

  • Switch Cases, Indication, And Locking (AREA)
  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
EP19910100639 1990-01-27 1991-01-19 Housing for a microswitch unit Withdrawn EP0440056A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4002371A DE4002371A1 (de) 1990-01-27 1990-01-27 Gehaeuse fuer eine mikroschalterbaueinheit
DE4002371 1990-01-27

Publications (2)

Publication Number Publication Date
EP0440056A2 true EP0440056A2 (fr) 1991-08-07
EP0440056A3 EP0440056A3 (en) 1992-07-22

Family

ID=6398883

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910100639 Withdrawn EP0440056A3 (en) 1990-01-27 1991-01-19 Housing for a microswitch unit

Country Status (4)

Country Link
US (1) US5113046A (fr)
EP (1) EP0440056A3 (fr)
JP (1) JPH04212219A (fr)
DE (1) DE4002371A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2500923A1 (fr) * 2011-03-15 2012-09-19 Makita Corporation Déclencheur pour outil électrique

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4442312C2 (de) * 1994-11-29 1996-09-12 Deere & Co Schalterbaugruppe
US5574265A (en) * 1995-02-28 1996-11-12 Honeywell Inc. Switch housing including extensible external actuator and improved terminal structure
US5850613A (en) * 1996-07-30 1998-12-15 Bullecks; David C. Apparatus and method for hands-free operation of a radio microphone
US7316167B2 (en) * 2000-05-16 2008-01-08 Fidelica, Microsystems, Inc. Method and apparatus for protection of contour sensing devices
US6578436B1 (en) 2000-05-16 2003-06-17 Fidelica Microsystems, Inc. Method and apparatus for pressure sensing
DE10139356A1 (de) * 2001-08-17 2003-02-27 Kiekert Ag Elektrische Bauelementanordnung
DE102012201672B4 (de) * 2012-02-06 2024-03-28 Robert Bosch Gmbh Handwerkzeugmaschine mit einer elektrischen Schaltereinrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431747A (en) * 1943-07-15 1947-12-02 First Ind Corp Switch mechanism
FR2134815A5 (fr) * 1971-04-21 1972-12-08 Telemecanique Electrique
US4295017A (en) * 1979-03-06 1981-10-13 Matsushita Electric Works, Ltd. Limit switch
WO1988003322A1 (fr) * 1986-10-22 1988-05-05 Conair Corporation Commutateur modulaire etanche pour appareils de soins personnels

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US2726105A (en) * 1952-06-16 1955-12-06 Cutler Hammer Inc Sealing means for electrical switches
US2744984A (en) * 1953-08-12 1956-05-08 Cutler Hammer Inc Sealing means for lever operated electric switches
US2806114A (en) * 1954-09-27 1957-09-10 Harry Williams Mfg Company Hermetically sealed snap switches
US2795959A (en) * 1955-08-12 1957-06-18 Electro Snap Switch & Mfg Co Hermetic seal for a switch
US3087341A (en) * 1958-07-18 1963-04-30 Cutler Hammer Inc Electric switches
US3155807A (en) * 1960-01-19 1964-11-03 Westinghouse Electric Corp Auxiliary actuating means for actuating a circuit controlling wiring device
DE1147287B (de) * 1960-03-18 1963-04-18 American Radiator & Standard Betaetigungshebel fuer Druckknopfschalter
US3210507A (en) * 1961-05-08 1965-10-05 Texas Instruments Inc Motion-transfer mechanisms for hermetically sealed diaphragms
BE637467A (fr) * 1962-09-18
DE1247438B (de) * 1963-01-29 1967-08-17 Grundig Max Mikroschalter
GB1004430A (en) * 1964-02-18 1965-09-15 Hpm Ind Pty Ltd Improved weatherproof switch
US3375340A (en) * 1967-02-09 1968-03-26 Honeywell Inc Momentary actuating arrangement
US3898397A (en) * 1974-06-27 1975-08-05 Amp Inc Multi-directional switch with elastomeric pivot and sealing member
US4356368A (en) * 1980-05-01 1982-10-26 Mcgill Manufacturing Company, Inc. Auxiliary switch assembly for a power contactor
US4429200A (en) * 1982-09-30 1984-01-31 Eaton Corporation Low cost, high performance switch assembly
US4453062A (en) * 1982-12-16 1984-06-05 Northern Telecom Limited Pushbutton switch and integral lamp for telephone dials
JPH0739147Y2 (ja) * 1988-01-25 1995-09-06 ウチヤ・サーモスタット株式会社 防水型スイッチ
DE8815814U1 (fr) * 1988-12-21 1990-04-12 Barlian, Reinhold, Dipl.-Ing. (Fh), 6990 Bad Mergentheim, De

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431747A (en) * 1943-07-15 1947-12-02 First Ind Corp Switch mechanism
FR2134815A5 (fr) * 1971-04-21 1972-12-08 Telemecanique Electrique
US4295017A (en) * 1979-03-06 1981-10-13 Matsushita Electric Works, Ltd. Limit switch
WO1988003322A1 (fr) * 1986-10-22 1988-05-05 Conair Corporation Commutateur modulaire etanche pour appareils de soins personnels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2500923A1 (fr) * 2011-03-15 2012-09-19 Makita Corporation Déclencheur pour outil électrique

Also Published As

Publication number Publication date
EP0440056A3 (en) 1992-07-22
JPH04212219A (ja) 1992-08-03
DE4002371C2 (fr) 1992-07-09
US5113046A (en) 1992-05-12
DE4002371A1 (de) 1991-08-01

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