EP0438321B1 - Interrupteur de fin de course et méthode de fabrication d'un axe rotatif pour l'interrupteur de fin de course - Google Patents

Interrupteur de fin de course et méthode de fabrication d'un axe rotatif pour l'interrupteur de fin de course Download PDF

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Publication number
EP0438321B1
EP0438321B1 EP19910300423 EP91300423A EP0438321B1 EP 0438321 B1 EP0438321 B1 EP 0438321B1 EP 19910300423 EP19910300423 EP 19910300423 EP 91300423 A EP91300423 A EP 91300423A EP 0438321 B1 EP0438321 B1 EP 0438321B1
Authority
EP
European Patent Office
Prior art keywords
rotary shaft
limit switch
grease
housing
plunger
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
EP19910300423
Other languages
German (de)
English (en)
Other versions
EP0438321A2 (fr
EP0438321A3 (en
Inventor
Masayuki Maeda
Takashi Niwa
Takao Kitamura
Kazuo Maeta
Norihito Yamane
Tatsuhide Morisawa
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.)
Omron Corp
Original Assignee
Omron Corp
Omron Tateisi Electronics 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
Priority claimed from JP312590U external-priority patent/JPH0739151Y2/ja
Priority claimed from JP2237239A external-priority patent/JP2899723B2/ja
Application filed by Omron Corp, Omron Tateisi Electronics Co filed Critical Omron Corp
Publication of EP0438321A2 publication Critical patent/EP0438321A2/fr
Publication of EP0438321A3 publication Critical patent/EP0438321A3/en
Application granted granted Critical
Publication of EP0438321B1 publication Critical patent/EP0438321B1/fr
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
    • 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
    • H01H21/28—Operating parts, e.g. handle biased to return to normal position upon removal of operating force adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift
    • H01H21/285—Operating parts, e.g. handle biased to return to normal position upon removal of operating force adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. door switch, limit switch, floor-levelling switch of a lift having an operating arm actuated by the movement of the body and mounted on an axis converting its rotating movement into a rectilinear switch activating movement

Definitions

  • the present invention relates to an improved limit switch and a method for manufacturing a rotary shaft for said limit switch.
  • the prior art limit switch has a rotary shaft a journaled within a housing and a roller lever is rigidly secured to one end of this rotary shaft a .
  • a cam portion b Formed at the other end of the rotary shaft a is a cam portion b such that as the rotary shaft a is turned with the roller lever c , this cam portion b actuates a switch element d within said housing via a plunger (not shown).
  • a bearing (not shown) supporting the rotary shaft a has a spiral channel on its inner surface so that the grease fed to the journal means spreads along said channel to the entire sliding surface of the rotary shaft a .
  • the present invention overcomes the above disadvantages of the prior art limit switch and provides an improved limit switch which features a smooth rotation of the roller lever and a method of manufacturing the same.
  • the present invention relates, in one aspect, to a limit switch comprising a housing, a switch element contained in said housing, a rotary shaft, a journal means supporting said rotary shaft, a roller lever secured to one end of said rotary shaft for driving said shaft, a cam portion formed at the other end of said rotary shaft and a plunger and an auxiliary plunger through which said switch element is driven by said cam portion, said rotary shaft having a grease reservoir means axially extending at its periphery to lubricate sliding surfaces of said rotary shaft and journal means.
  • the present invention provides a limit switch which is generally the same as the above-mentioned switch except that said grease reservor means consists of two axially intending grease reservoirs.
  • the present invention relates to a method of manufacturing a limit switch rotary shaft which comprises die-casting a rotary shaft using a split die consisting of an upper segment and a lower segment, said segments being configured to form a couple of axially extending plane areas to serve as grease reservoirs alone their parting line and a multiplicity of minute hills and valleys for improved lubrication on the peripheral surface of the rotary shaft.
  • the above method eliminates the need for machining the grease reservoir on the sliding surface of the rotary shaft and provides for effective diffusion of the grease by taking advantage of minute hills and valleys formed on the surface of the shaft in die casting.
  • the reference numeral 1 indicates a housing having a head unit 2 in which a journal means 3 is mounted.
  • a journal means 3 Rotatably supported by this journal means 3 is a rotary shaft 4.
  • this rotary shaft 4 is formed with a reduced portion 4a having a spline at one end and the base of a roller lever 6 rotatably supporting a roller 5 is fitted into the other end of said reduced portion 4a.
  • the rotary shaft 4 is provided with an annular groove 4b for installation of an O-ring in a position closer to said reduced portion 4a.
  • the intermediate portion of the rotary shaft 4 is locally reduced in thickness to form an axially elongated flat surface for use as a grease reservoir means 4c.
  • this intermediate portion is provided with two grease reservoirs 4c which are formed in die casting as described in detail hereinafter.
  • a cam portion 4d Formed at the other end of the rotary shaft 4 is a cam portion 4d which is offset from the axis of the shaft 4 and a plunger 8 accommodated in the head unit 2 of the housing 1 is abutted against the upper surface of said cam portion 4d.
  • the above-mentioned plunger 8 is biased against the cam portion 4d by a compression spring 9 so that as the rotary shaft 4 is driven by the roller lever 6, the cam portion 4d pushes up the plunger 8 to compress the compression spring 9.
  • Another plunger 10 is abutted against the underside of the cam portion 4d.
  • the aforesaid plunger 10 is abutted against the upper end of a vertically movable auxiliary plunger 11 within the housing 10 via a spring 11a and the lower part of the auxiliary plunger 11 is connected to an operable part of a switch element 12 housed within the housing 1.
  • the reference numeral 13 indicates a seal cap disposed over the auxiliary plunger 11 for preventing entry of grease into the switch element 12 within the housing 1 from the rotary shaft region.
  • the rotary shaft 4 illustrated in Fig. 2A can be advantageously manufactured by die casting.
  • the die not shown consists of a upper segment and a lower segment, with the parting line thereof being complementary to said grease reservoirs 4c.
  • molten zinc or aluminum for instance, is poured into such a die to manufacture a rotary shaft 4
  • a couple of flat areas 4c extending axially are formed in the cast shaft in the positions corresponding to the parting line or joint between the upper and lower die segments. If bars are produced, they will never be projecting beyond the sliding surface 4f, with the result that the finishing operation such as bar trimming may be omitted.
  • these flat areas serve as grease reservoirs.
  • the flat areas 4c form clearances between the inner surface of the journal and the sliding surface 4f. These clearances are filled with grease for lubrication.
  • the die-cast sliding surface 4f reveals under magnification a multiplicity of hills and valleys distributed all over as illustrated in Fig. 4. Therefore, as the rotary shaft 4 is driven by the roller lever 6, the grease fed to said reservoirs finds its way into the valleys to lubricate the sliding surfaces, thus precluding chances of oil shortage.
  • This improvement in lubrication not only insures smooth rotation of the shaft but prevents abnormal wear and seizure, thus contributing to an increased switch life.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
  • Rolling Contact Bearings (AREA)
  • Transmission Devices (AREA)
  • General Details Of Gearings (AREA)

Claims (3)

  1. Un interrupteur de fin de course comprenant un boîtier, un élément interrupteur (12) contenu dans ledit boîtier (1), un arbre rotatif (4), un moyen de fusée ou de tourrillon supportant ledit arbre rotatif (4), un levier à rouleaux (6) fixé à une extrémité de l'arbre rotatif (4) pour entraîner ledit arbre (4), une portion de came (4b) formée à l'autre extrémité dudit arbre rotatif (4) et un piston (10) et un piston auxiliaire (11), par l'intermédiaire desquels ledit élément interrupteur (12) est entraîné par ladite portion de came, caractérisé en ce que l'arbre rotatif (4) comprend des moyens de réservoir de graisse ou lubrifiant, axialement disposés à sa périphérie pour lubrifier les surfaces coulissantes de l'arbre rotatif (4) et des moyens de fusée.
  2. Un interrupteur de fin de course selon la revendication 1, dans lequel les moyens de réservoir de graisse (4c) sont formés par un couple de réservoirs s'étendant le long de la longueur de l'arbre rotatif (4).
  3. Un procédé de fabrication d'un arbre rotatif d'interrupteur de fin de course (4), qui implique la réalisation d'un arbre rotatif (4) par coulage sous pression en utilisant une filière fendue formée par un segment supérieur et un segment inférieur, lesdits segments étant configurés de façon à former un couple de zones planes s'étendant axialement pour servir de réservoirs de graisse (4c) le long de leur ligne de partage et une multiplicité de menues collines et vallées pour améliorer la lubrification sur la surface périphérique de l'arbre rotatif (4).
EP19910300423 1990-01-19 1991-01-18 Interrupteur de fin de course et méthode de fabrication d'un axe rotatif pour l'interrupteur de fin de course Expired - Lifetime EP0438321B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP3125/90U 1990-01-19
JP312590U JPH0739151Y2 (ja) 1990-01-19 1990-01-19 リミットスイッチ
JP2237239A JP2899723B2 (ja) 1990-09-10 1990-09-10 リミットスイッチの回転軸の製造方法
JP237239/90 1990-09-10

Publications (3)

Publication Number Publication Date
EP0438321A2 EP0438321A2 (fr) 1991-07-24
EP0438321A3 EP0438321A3 (en) 1992-08-05
EP0438321B1 true EP0438321B1 (fr) 1994-12-07

Family

ID=26336634

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910300423 Expired - Lifetime EP0438321B1 (fr) 1990-01-19 1991-01-18 Interrupteur de fin de course et méthode de fabrication d'un axe rotatif pour l'interrupteur de fin de course

Country Status (3)

Country Link
EP (1) EP0438321B1 (fr)
DE (1) DE69105532T2 (fr)
ES (1) ES2068495T3 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101452789B (zh) * 2007-11-29 2010-08-18 上海精益电器厂有限公司 一种用于行程开关的万向型操动器
JP2015138762A (ja) * 2014-01-24 2015-07-30 オムロン株式会社 スイッチ
JP6854665B2 (ja) * 2017-02-21 2021-04-07 アズビル株式会社 リミットスイッチの製造方法
CN115831675A (zh) * 2022-11-30 2023-03-21 合隆防爆电气有限公司 一种防爆电气用断路器及其使用方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959614A (en) * 1974-10-07 1976-05-25 Allen-Bradley Company Limit switch rotary return mechanism

Also Published As

Publication number Publication date
DE69105532T2 (de) 1995-06-14
EP0438321A2 (fr) 1991-07-24
EP0438321A3 (en) 1992-08-05
DE69105532D1 (de) 1995-01-19
ES2068495T3 (es) 1995-04-16

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