EP0115281B1 - Assemblage d'interrupteur de fin de course - Google Patents

Assemblage d'interrupteur de fin de course Download PDF

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Publication number
EP0115281B1
EP0115281B1 EP84100244A EP84100244A EP0115281B1 EP 0115281 B1 EP0115281 B1 EP 0115281B1 EP 84100244 A EP84100244 A EP 84100244A EP 84100244 A EP84100244 A EP 84100244A EP 0115281 B1 EP0115281 B1 EP 0115281B1
Authority
EP
European Patent Office
Prior art keywords
switch
box
head
switch box
rubber hood
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
Application number
EP84100244A
Other languages
German (de)
English (en)
Other versions
EP0115281A1 (fr
Inventor
Haruo Atsumi
Norio Iwakiri
Yasuhiro Kiyono
Tomohiko Hayakawa
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 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
Application filed by Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to AT84100244T priority Critical patent/ATE26766T1/de
Publication of EP0115281A1 publication Critical patent/EP0115281A1/fr
Application granted granted Critical
Publication of EP0115281B1 publication Critical patent/EP0115281B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/04—Cases; Covers
    • H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon
    • H01H13/14—Operating parts, e.g. push-button
    • H01H13/18—Operating parts, e.g. push-button 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/04—Cases; Covers
    • H01H13/06—Dustproof, splashproof, drip-proof, waterproof or flameproof casings
    • H01H13/063—Casings hermetically closed by a diaphragm through which passes an actuating member

Definitions

  • the present invention generally relates to a limit switch assembly and, more particularly, to a limit switch assembly of a type comprising a switch box having a built-in switch, and a head mounted on the switch box and having an actuator for actuating the switch.
  • the intrusion of oil into the built-in switch by the capillary action may also take place through the set screws used to secure the switch in position within the switch box, thereby posing a problem similar to that described above. Furthermore, where the switch is secured in position within the switch box by the use of the set screws, impacts and/or vibrations applied exteriorly to the switch box tend to be transmitted to the built-in switch, and, in the worst it may happen, not only does the built-in switch fail to operate property, but also external wiring elements connected to respective terminal members of the built-in switch may separate from the terminal members.
  • the rubber hood in a manner as shown in Fig. 9 of the accompanying drawings.
  • the rubber hood generally identified by 34, is configured to substantially tightly receive therein the switch 33 contacting all of the surfaces of said switch including the surface thereof from which the push button protrudes outwards, but excluding the surface thereof from which terminal members protrude outwards.
  • the switch 33 so covered by the rubber hood 34 is secured to a wall of the switch box 20 by means of screws 60 extending through respective mounting holes 33c defined in the switch 33 so as to extend completely through the thickness thereof.
  • both the impact resistance and the dust proofness of the switch assembly may be improved.
  • a worker engaged in the fabrication of the switch assembly will be forced to locate the mounting holes 33c exteriorly of the rubber hood 34 immediately before the screws 61 are inserted therethrough to secure the switch to the wall of the switch box 20.
  • portions of the rubber hood adjacent the screws extending through the respective mounting holes may be inwardly compressed, as shown, as the screws are fastened, and accordingly, in the assembled condition, the switch 33 may happen to be secured in a manner tilted relative to the wall of the switch box 20.
  • the operating position of the actuator for actuating the push button of the switch may deviate from a predetermined or required position to such an extent as to fail to properly engage an external driving element.
  • GB-A-1 362196 discloses a push-button forming part of an alarm contact box.
  • the switch is covered by elastomeric rear and front covers, the rear cover having a "top-hat” shaped central portion fitted with considerable clearance over the main portion of the switch and a collar fitted tightly around a base plate of the switch through which base plate the switch is mounted to the front plate of the housing of the alarm contact box by screws extending through the collar and clamping the same between the screws and the base plate of the switch and also between the base plate of the switch and the front plate of the housing.
  • the front cover extending along the outer side of the base plate of the switch and over the push-button of the switch protruding from the base plate continues the rear cover and is clamped between the base plate of the switch and the front plate of the housing.
  • a limit switch assembly according to the preamble of claim 1 in which the switch is fitted into a housing which covers all of the surfaces of the switch fitted therein except for the surface thereof from which the terminal members protrude.
  • the housing is slideably supported by the outer switch box so as to be adjustable together with the switch fitted therein by an adjustment screw in a direction towards an actuator member of the switch assembly in order to obtain a definite spatial relationship between the actuator member and the push-button of the switch.
  • An elastomeric cap-like membrane is interposed between and around the actuator and the push-button extending through said housing in order to seal the space around the push-button and the actuator member.
  • US-A-4 342 894 describes a switch assembly comprising a push-button switch fitted into an elastomeric hood which has an expandable section provided for compensating an increase in the volume of the air within a sealed chamber surrounding the switch.
  • the present invention has been developed with a view to substantially eliminating the disadvantages and inconveniences inherent in the prior art switch assemblies and has for its essential object to provide an improved switch assembly which has a high resistance to impacts and also a high dust proofness and which is reliable in operation.
  • Another object of the present invention is to provide an improved switch assembly of the type referred to above, wherein means is provided to minimize change in pressure which would occur inside the head as a result of the movement of the actuator, thereby to facilitate a smooth movement thereof with the minimized driving force.
  • a further object of the present invention is to provide an improved switch assembly of the type referred to above, which can be easily fabricated with no need to locate the mounting holes such as required in the prior art.
  • a limit switch assembly embodying the present invention generally comprises a head 1 and a switch box 20 both connected together by means of a plurality of, for example, two, connecting bolts or screws 10.
  • the head 1 has a tubular bearing member 2 protruding outwards from one surface thereof opposite the switch box 20.
  • the plunger 3 is shown as having a roller member 5 rotatably mounted on an outer end thereof positioned exteriorly of the head 1 for engagement with an external driving element (not shown). The plunger 3 so supported by the bearing member 2 is normally biased to the projected position, as shown in Fig.
  • a return spring 7 interposed between the plunger 3 and a generally rectangular spring seat member 6 secured to one surface of the head 1 opposite to the surface thereof from which the bearing member 2 projects outwardly and confronting the switch box 20.
  • a safety spring 9 substantially housed within the plunger 3 and interposed between the plunger 3 and one end of the operating piece 8, the other end of said operating piece 8 protruding outwardly through an opening 6a in the spring seat member 6.
  • the switch box 20 is a generally box-like container having a recess 21 defined therein leaving four continued side walls and a bottom wall as viewed in Fig. 2. Within the recess 21, there is disposed a sheet-like insulator 30 and a printed circuit board 31 both held against the bottom wall of the switch box 20.
  • the built-in switch 33 is also accommodated within the recess 21 and positioned on one side of the printed circuit board 31 opposite to the insulator 30, but in the form as covered by a rubber hood 34.
  • the rubber hood 34 shown in detail in Figs.
  • 3 to 6 is of generally box-like configuration and is of such a design as to substantially cover all of the surfaces of the built-in switch 33 except for the surface thereof from which terminal members 34d protrude outwardly for external electrical connection.
  • the surfaces of the built-in switch 33 covered by the rubber hood 34 include the surface 33a from which a push-button 33b extends outwardly and the opposite surfaces at which the opposite ends of each of the mounting holes 33c defined in the built-in switch are opened.
  • the rubber hood 34 has a circumferential flange 34a protruding laterally outwardly therefrom in a plane generally in flush with the surface 33a of the built-in switch 33, which circumferential flange 34a is adapted to be clamped between the head 1 and the switch box 20.
  • a portion of the rubber hood 34 confronting the surface 33b of the built-in switch 33 has a metal piece 50 inserted in alignment with the push button 33b on the one hand and with the operating piece 8 on the other hand.
  • the rubber hood 34 has a cavity 34b defined therein at a location laterally of the built-in switch 33, which cavity 34b is in communication with the interior of the head 1 to substantially increase the volume of the interior of the head 1 forthe purpose as will be described later.
  • the rubber hood 34 also has cutouts 34c formed therein at a portion thereof confronting the bottom of the recess 21 and generally in alignment with the respective openings of the mounting holes 33c, such that when and after the switch 33 having been covered by the rubber hood 34 has been inserted into the recess 21 of the switch box 20 through an opening 22 in said box 20 in a manner with the push button 33b located outside the switch box 20, spaced projections 23 integral with the bottom wall of the switch box 20 tightly fit into the associated holes 33c in the built-in switch 33 through the respective cutouts 34c to hold the switch 33 in position within the switch box 20.
  • the switch 33 so accommodated in the switch box 20 is secured in position by a generally elongated stopper 35 press-fitted into the box 20 with its opposite ends tightly engaged against the opposite side walls of the box 20 as best shown in Fig. 8.
  • steps 27 formed laterally of the respective projections 23 contact the lateral surface of the switch 33 through the associated cutouts 34c in the rubber hood 34 as best shown in Fig. 8, and, therefore, the extent to which the switch 33 is urged by the stopper 35 against the bottom wall of the box 20 can advantageously restricted by the contact between the steps 27 and the lateral surface of the switch 33.
  • the side wall of the box 20 confronting the opening 22 is formed with a bore 25 into which a rubber bushing 37 having a cord 38 extending therethrough is sealingly plugged.
  • the cord 38 has a plurality of insulated lead wires 38a, one connected to a grounding pin 39 inserted in the switch box 20 and the remaining lead wires connected respectively to the terminal members 33d.
  • the switch box 20 is also formed with a window 26 at a corner area defined by the side wall with the bore 25 and the adjoining side wall, which window 26 is covered by a transparent lens member 40 so that a display element 32, such as a light emitting diode or the like, mounted on the printed circuit board 31 can be viewed from the outside of the switch box 20.
  • the switch assembly of the construction described above can be fabricated in the following manner.
  • the insulator 30 and the printed circuit board 31 are placed within the switch box 20 and, thereafter, the switch 33 covered with the rubber hood 34 is inserted into the box 20 through the opening 22.
  • the stopper 35 is then inserted into the box 20 with its opposite ends sliding along the associated side walls of the box 20 to fix the switch 33 firmly in position within the box 20.
  • a portion of the opening 22 around the switch 33 and exterior of the rubber hood 34 is closed by the circumferential flange 34a integral with the rubber hood 34, which circumferential flange 34a is then positioned exteriorly of the box 20 surrounding the opening 22 in the box 20.
  • the cord 38 having the rubber bushing 37 thereon is inserted through the bore 25 so as to extend into the interior of the box 20 with the rubber bushing 37 tightly plugged into the bore 25.
  • a synthetic filler material such as, for example, an epoxy resin, is poured into the recess 21 to solidify therein and the name plate 36 is then placed to close the opening of the box 20 leading into the recess 21. In this assembled condition so far described, even though foreign matters such as dusts and oil fall on the box 20, they do not reach the switch 33 and, thus, the switch 33 is protected from them.
  • the switch assembly according to the present invention described with reference to and shown in Figs. 1 to 8 operates in a manner similar to a conventional limit switch assembly. That is to say, when the roller 5 contacts the external driving element, the plunger 3 is moved from the projected position towards the depressed position against the return spring 7, accompanied by the corresponding movement of the operating piece 8. As the operating piece 8 moves as urged by the safety spring 9, the end of the operating piece 8 adjacent the metal piece 50 protrudes the required distance outwardly from the opening 6a in the spring seat member 6 to depress the push button 33b through the metal piece 50. When the push button 33b is depressed, the switching state of the switch 33 changes and the display element 32 may be energized or deenergized to provide through the transparent lens element 40 a visual indication of a particular switching state of the switch 33.
  • the compressed airwithin the head 1 may leak to such an extent that the pressure within the head 1 becomes equal to the atmospheric pressure.
  • the driving force applied to the plunger 3 to maintain the latter in the depressed position is released when and after the pressure inside the head 1 has become equal to the atmospheric pressure
  • the return movement of the plunger 3 back to the projected position by the action of the spring 7 may develop a negative pressure inside the head 1, imposing a resistance to the smooth movement of the plunger towards the projected position.
  • This problem is also eliminated according to the present invention by the provision of the cavity 34b which, in this case, acts to minimize the development of the negative pressure.
  • the switch since the switch is covered by the rubber hood, the switch is protected not only from the external foreign matters, but also from impacts. Therefore, the switch assembly as a whole has a dust-proof structure with an improved resistance to impacts. In addition, since no screw elements are employed to secure the switch in position, the switch assembly as a whole is relatively easy to fabricate with no possibility of the switch being displaced relative to the operating piece.
  • the presence of the cavity in the rubber hood is advantageous in that the smooth movement of the plunger is assured at all times without being affected by the pressure which may be developed within the head.
  • the actuator for the switch has been described and shown as comprised of the plunger and the operating piece, it may comprise a lever or any other actuator operable to push the push button of the switch exteriorly of the rubber hood.
  • the use of the filler material although it is advantageous in that the internal parts can be protected and insulated, is not always essential to the present invention and may, therefore, be omitted.
  • the switch has been described as inserted into the box through the opening defined in the box so as to confront the head, it may be loaded into the box through the opening which is subsequently closed by the name plate.
  • the rubber hood may have holes in place of the cutouts 34c.

Landscapes

  • Push-Button Switches (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Control Of Eletrric Generators (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Switch Cases, Indication, And Locking (AREA)

Claims (4)

1. Ensemble formant interrupteur de fin de course, qui comporte:
une tête (1) comportant un actionner (8) déplaçable entre des première et seconde positions actives:
un interrupteur (33) comportant un bouton-poussoir (3b) faisant saillie vers l'extérieur à partir d'une première surface (33a) de cet interrupteur et déplaçable entre des positions en saillie et en renfoncement correspondant respectivement aux première et seconde positions actives de l'actionner (8), ledit interrupteur possédant également au moins deux éléments formant bornes (33d) faisant saillie à l'extérieur à partir d'une seconde surface de cet interrupteur de manière à permettre le raccordement électrique à des organes extérieurs de câblage (38a);
un capot en caoutchouc (34) agencé en vue de recevoir d'une manière essentiellement étanche l'interrupteur (33), hormis la seconde surface de cet interrupteur, caractérisé en ce
que le capot en caoutchouc possède une bride circonférentielle (34a) formée d'un seul tenant avec lui-même de manière à s'étendre à l'extérieur dans un plan qui d'une manière générale est parallèle à la première surface (33a) de l'interrupteur;
qu'il est prévu un boîtier (20) pour l'interrupteur comportant une ouverture (22) définie dans ce boîtier en un emplacement situé en vis-à-vis de la tête et qui loge en lui-même l'interrupteur (33) ainsi que le capot en caoutchouc (34), ladite bride circonférentielle (34a) étant, lorsque l'interrupteur est ainsi logé dans le boîtier, disposée à l'extérieur du boîtier de l'interrupteur et entourant l'ouverture (22) ménagée dans ce boîtier; et
qu'il est prévu des moyens (10) pour raccorder la tête (1) et le boîtier (20) de l'interrupteur l'un à l'autre, l'actionneur (8) étant aligné avec le bouton-poussoir (33b) par l'intermédiaire d'une partie du capot en caoutchouc (34) recouvrant ledit bouton-poussoir, ladite bride circonférentielle (34a) étant fermement serrée entre la tête et le boîtier de l'interrupteur, lorsque ces deux éléments sont raccordés l'un à l'autre.
2. Ensemble selon la revendication 1, dans lequel ledit interrupteur (33) comporte au moins un trou de montage (33c) défini en lui et dans lequel ledit boîtier de l'interrupteur possède une partie saillante (23) formée en lui de manière à s'engager dans le trou de montage lorsque l'interrupteur est logé dans son boîtier, et dans lequel une partie du capot en caoutchouc, dont la position correspond au trou de montage, est supprimée de manière à former une découpe (34c) dégageant le passage pour la partie saillante, et comportant en outre des moyens d'arrêt (35) servant à repousser l'interrupteur contre une paroi de son boîtier afin de bloquer ledit interrupteur en position à l'intérieur du boîtier.
3. Ensemble selon la revendication 2, dans lequel le boîtier de l'interrupteur comporte une partie étagée (27) définie en lui en un emplacement disposé latéralement par rapport à la partie saillante (23), ladite partie étagée contactant l'interrupteur à travers les découpes ménagées dans le capot en caoutchouc.
4. Ensemble selon la revendication 1, dans lequel ledit capot un caoutchouc comporte une cavité (34b) définie en lui et communiquant avec l'intérieur de la tête.
EP84100244A 1983-01-12 1984-01-11 Assemblage d'interrupteur de fin de course Expired EP0115281B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84100244T ATE26766T1 (de) 1983-01-12 1984-01-11 Endschaltermontierung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP3159/83U 1983-01-12
JP1983003159U JPS59109028U (ja) 1983-01-12 1983-01-12 リミツトスイツチ

Publications (2)

Publication Number Publication Date
EP0115281A1 EP0115281A1 (fr) 1984-08-08
EP0115281B1 true EP0115281B1 (fr) 1987-04-22

Family

ID=11549567

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100244A Expired EP0115281B1 (fr) 1983-01-12 1984-01-11 Assemblage d'interrupteur de fin de course

Country Status (4)

Country Link
EP (1) EP0115281B1 (fr)
JP (1) JPS59109028U (fr)
AT (1) ATE26766T1 (fr)
DE (1) DE3463315D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8993903B2 (en) 2007-07-23 2015-03-31 Honeywell International Inc. Sealed dual plunger switch assembly with simultaneity

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT209794Z2 (it) * 1987-01-14 1988-11-04 Cavis Cavetti Isolati Spa Struttura di pulsantiera, particolarmente studiata per azionamento dell'alzacristalli elettrico in autoveicoli.
IT1248935B (it) * 1990-06-04 1995-02-11 Sin Cros M D S R L Struttura di contatto mobile,attuato tramite una rotella, particolarmente studiato per spinterogeni di motori endotermici
DE4137484C2 (de) * 1991-11-14 1995-06-29 Roland Man Druckmasch Spanndorn
JP2557333Y2 (ja) * 1992-02-25 1997-12-10 株式会社ハーマン マイクロスイッチの防水構造
FR2695707B1 (fr) * 1992-09-17 1995-10-20 Parcellier Raymond Appareil de securite electromecanique pour la protection contre les surcharges.
DE4330917C1 (de) * 1993-09-11 1995-02-16 Merit Werk Merten & Co Kg Schalter für Kraftfahrzeuge, insbesondere Rückfahrlicht- und Getriebeschalter oder dergleichen
DE19808060A1 (de) * 1998-02-26 1999-09-09 Euchner Gmbh & Co Grenztaster
DE10105630B4 (de) * 2001-02-08 2011-09-22 Volkswagen Ag Rastierschalter
KR102116228B1 (ko) * 2016-03-11 2020-05-28 니토 코키 가부시키가이샤 벨트식 연삭 공구
CN107631449A (zh) * 2017-10-31 2018-01-26 广东美的制冷设备有限公司 空调器室内机的应急开关盒组件和空调器室内机

Family Cites Families (6)

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Publication number Priority date Publication date Assignee Title
US3085140A (en) * 1959-02-24 1963-04-09 Robertshaw Fulton Controls Co Encapsulated switch
CH399568A (de) * 1962-08-03 1965-09-30 Edwin Dr Guignard Hermetisch verschlossenes Gehäuse mit eingebautem, mechanisch betätigbarem elektrischen Schalter
US3539738A (en) * 1968-11-12 1970-11-10 Gen Electric Miniature industrial limit switch
GB1362196A (en) * 1971-08-20 1974-07-30 Ashworth & Co Ltd T Electrical switches
FR2413770A1 (fr) * 1977-12-30 1979-07-27 Telemecanique Electrique Interrupteur de position etanche
US4342894A (en) * 1980-10-06 1982-08-03 Robertshaw Controls Company Electrical switch construction diaphragm seal therefor and methods of making the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8993903B2 (en) 2007-07-23 2015-03-31 Honeywell International Inc. Sealed dual plunger switch assembly with simultaneity

Also Published As

Publication number Publication date
DE3463315D1 (en) 1987-05-27
ATE26766T1 (de) 1987-05-15
EP0115281A1 (fr) 1984-08-08
JPS59109028U (ja) 1984-07-23

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