EP0344800A2 - Mikroschalter - Google Patents

Mikroschalter Download PDF

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Publication number
EP0344800A2
EP0344800A2 EP89110031A EP89110031A EP0344800A2 EP 0344800 A2 EP0344800 A2 EP 0344800A2 EP 89110031 A EP89110031 A EP 89110031A EP 89110031 A EP89110031 A EP 89110031A EP 0344800 A2 EP0344800 A2 EP 0344800A2
Authority
EP
European Patent Office
Prior art keywords
casing
push
projection
slot
casing half
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Withdrawn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
EP89110031A
Other languages
English (en)
French (fr)
Other versions
EP0344800A3 (de
Inventor
Masatsugu C/O Omron Tateisi Electr.Co. Yamashita
Masayuki C/O Omron Tateisi Electr. Co. Maeda
Takahiro C/O Omron Tateisi Electr. Co. Sakakino
Tsuyoshi C/O Omron Tateisi Electr. Co. Takata
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
Priority claimed from JP7442988U external-priority patent/JPH01177843U/ja
Priority claimed from JP7443188U external-priority patent/JPH0628747Y2/ja
Priority claimed from JP1988074432U external-priority patent/JPH071704Y2/ja
Priority claimed from JP7497788U external-priority patent/JPH01177836U/ja
Priority claimed from JP7497688U external-priority patent/JPH01177826U/ja
Application filed by Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Publication of EP0344800A2 publication Critical patent/EP0344800A2/de
Publication of EP0344800A3 publication Critical patent/EP0344800A3/de
Withdrawn legal-status Critical Current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
    • H01H13/12—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
    • H01H13/186—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 wherein the pushbutton is rectilinearly actuated by a lever pivoting on the housing of the switch
    • 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
    • H01H13/10—Bases; Stationary contacts mounted thereon
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/06—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier
    • H01H2011/067—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier by deforming, e.g. bending, folding or caulking, part of the contact or terminal which is being mounted

Definitions

  • the present invention relates to a microswitch, more particularly, to a microswitch which can be actuated with a small actuating stroke and is suitable for use as limit switch.
  • Microswitches are widely used as limit switches, and are desired to be reliable and compact. Further, they must be suitable for automated mass production in order to reduce the cost. In automated mass production, terminal pieces are mounted by automated assembly machines, and it is therefore important that terminal pieces may be mounted without requiring high position precision, but the terminal pieces must be kept securely in position once they are mounted.
  • the interior of the casing is so small and, hence, the distance between the outer ends of the terminal pieces and the contact mechanism formed at their inner ends is so small that a special care is required to prevent soldering flux from infiltrating into the casing interior or into the contact mechanism when soldering lead wires to the outer ends of the terminal pieces.
  • a primary object of the present invention is to provide a microswitch using a terminal piece mounting structure which permits smooth fitting of a terminal piece into a fitting slot provided in a casing.
  • a second object of the present invention is to provide a microswitch which is compact but protected from the infiltration of soldering flux into the contact mechanism at the time of soldering.
  • a third object of the present invention is to provide a microswitch which can be used in any orientation without impairing its reliability.
  • a fourth object of the present invention is to provide a microswitch which is compact and durable.
  • a microswitch comprising: a casing consisting of a base casing half and a cover casing half; at least a pair of terminal pieces received, at their intermediate parts, in slots provided in the base casing half and extending substantially perpendicularly from a surface opposing a corresponding surface of the cover casing half, each of the terminal pieces being provided with a first end extending in a cavity defined in the casing and a second end extending out of the casing; a contact mechanism accommodated in the cavity and electrically connected to the terminal pieces; and a push-button member elastically supported by spring means and projecting out of the casing for actuating the contact mechanism by movement of the push-button member; at least one of the terminal pieces being provided with a projection extending from its leading edge which is adapted to be received in one of the slots, and the slot being provided with a recess for receiving the projection; wherein the slot comprises an external part adjoining the cover cas
  • the projection may be easily fitted into the recess because the terminal piece is still in the broader part of the slot and can be easily shifted at this stage, but, once the projection is received in the recess, the terminal piece is securely held in position by the narrower part of the slot.
  • the internal part and the external part are both defined by mutually parallel side walls of the slot, and the two parts are separated by stepped shoulder surfaces.
  • the external part may be defined by a pair of converging wall surfaces of the slot
  • the internal part is defined by a pair mutually parallel side wall surfaces of the slot, the two parts being separated from each other by continuous transition of the converging wall surfaces to the parallel wall surfaces of the slot.
  • the slot is provided with a groove extending substantially over its entire depth.
  • This groove serves as a flux pocket for preventing the infiltration of flux into the casing at the time of soldering. Therefore, the reliability of the contact mechanism can be improved.
  • the cover casing half is provided with a pair of side walls which extend along external side surfaces of the base casing half in parallel with the slot, and another groove extending in parallel with the groove is defined between one of the side walls of the cover casing half and a corresponding one of the external side surfaces of the base casing half.
  • This groove serves as an additional flux pocket which prevents infiltration of flux into the interior of the casing through the parting line between the two casing halves.
  • the first end of the terminal piece is supported by two points of the base casing half, one of the support points located in relatively less flexible part of the base casing half being made of a readily deformable projection. Since any dimensional or positional error is accommodated by the deformable projection, deformation of the casing or insufficient support for the terminal piece can be avoided even when the shape and dimensions of the terminal pieces are not very precise.
  • the deformable projection is provided with grooves on either side thereof to make it even more deformable.
  • the projection may be provided with a tapered free end.
  • the first end carries a contact point and is provided with a lateral projection adjacent to the contact point to the end of dissipating the heat generated at the contact point.
  • the push-button member is provided with a pair of lateral projections which are engaged by a fringe of an opening of the casing through which a free end of the push-button member projects out of the casing, and a pair of sliding surfaces extending from the free end of the push-button member to an internal end of the push-button member, through the engagement portions.
  • the effective length of the sliding surfaces can be increased even further if the casing is provided with a pair of projections which extends inwardly from the internal fringe of the opening so as to define sliding surfaces for sliding contact with the sliding surfaces of the push-button member.
  • the opening be provided with a pair of shoulder portions defining a broader part of the opening at its outermost part thereof.
  • the microswitch further comprises a lever member having an arm portion and a pair of lateral flanges extending from a base end thereof and each provided with an opening which is fitted upon a projection provided in the casing, an intermediate point of the arm portion abutting the free end of the push-button member, and each of the flanges being provided with an engagement portion which is engaged by a part of the casing so as to define an angular position of the arm portion most remote from the push-button member.
  • numeral 1 denotes a main body casing made of resin material, and a block portion 2 projects from a lower half thereof.
  • a moveable contact terminal piece 6 and two fixed contact terminal pieces 8 and 10 are mounted on this block portion 2 by being fitted into three slots 4 provided in a surface of the block portion 2.
  • a switch movement space 14 is defined by the block portion 2 and a upright wall portion 12 in a part of the resin casing 1 located above the block portion 2, and upper parts 6a, 8a and 10a of the terminal pieces 6, 8 and 10 and a moveable piece 18 mounted on the upper part 6a of the terminal piece 6 via a spring plate 16 are arranged in this switch movement space 14 in such a manner that fixed contact pieces 20 and 22 attached to end portions of the upper parts 8a and 10a of the terminal pieces 8 and 10 oppose an end portion of the moveable piece 18 by way of a movable contact point 24.
  • Numeral 26 denotes a push-button which is mounted in an opening 28 provided in the upright wall 12, and its upper portion projects upwardly from the opening 28 while its lower portion is located above the moveable contact piece 18.
  • Numeral 30 in the block portion 2 denotes the fitting holes into which bosses of the cover casing made of resin material are integrally fitted when the cover casing is mounted on the resin casing 1.
  • the terminal pieces 6, 8 and 10 are mounted by fitting them into the fitting slots 4 as mentioned previously, and the mounting structure for them is now described in the following by taking the example of the terminal piece 10 with reference to Figures 3 and 4.
  • a fitting end side edge 3 of the terminal piece 10 is provided with a positioning projection 5, and a corresponding positioning recess 9 is provided at the bottom of the fitting slot 4.
  • the two ends of the leading edge of the positioning projection 5 and the two ends of the opening of the positioning recess 9 are provided with fitting guide portions 11 and 13.
  • the positioning projection 5 is fitted into the positioning recess 9, and the positioning of the terminal piece 10 with respect to the fitting slot 4 along the direction indicated by the arrow A is thereby accomplished.
  • the upper portion 10a of the terminal piece 10 is provided with the aforementioned fixed contact point, and the positioning in the direction indicated by the arrow is required to be accurately performed in order to place the fixed contact 22 in aligned relationship with the moveable contact point 24 as prescribed.
  • Fitting of the terminal piece 10 into the fitting slot 4 is typically performed by an automated assembling machine, and this machine performs the positioning of the terminal piece 10 in the slot 4 along the widthwise direction and, additionally, the positioning of the positioning projection 5 of the terminal piece 10 in the positioning recess 9 in the fitting slot 4 along the direction indicated by the arrow, but there have been the cases of positioning errors.
  • numeral 21 denotes a cover casing made of resin material, and its internal surface is provided with three bosses 23 of various sizes which are adapted to be fitted into corresponding holes 30 provided in the resin casing 1 of the main body when the cover casing 21 is mounted on the resin casing 1.
  • the overall casing consists of a base casing half or the resin casing 1 and a cover casing half or the resin casing 21.
  • the two larger bosses 23 on either side are cylindrical in shape, and their through holes 25 are used as mounting holes for the microswitch.
  • the cover casing 21 is provided with fitting slots 27 for terminal pieces 6, 8 and 10 at those parts corresponding to fitting slots 4 of the resin casing 1.
  • a corner portion of the external surface of the resin casing 21 is provided with a pivot portion 29 projecting therefrom for pivotally mounting an actuator 26 for selectively applying pressure to the push-button 26.
  • a similar pivot portion is provided also in the resin casing 1 at its part corresponding to the pivot portion 29 of the resin casing 21.
  • the terminal piece 10 is provided with a positioning projection 5 at its fitting edge 5, and the fitting slot 4 is provided with a positioning recess 9.
  • the fitting slot 4 is broader at its upper portion 4a than at its lower portion 4b, the boundary therebetween being defined by sloping steps 19.
  • the depth x of the lower portion 4b is slightly smaller than the length y of the positioning projection 5.
  • Numeral 7a denotes a flux pocket for preventing the infiltration of flux into the casing interior when performing soldering on the terminal portion 15.
  • the terminal piece 10 may be fitted into the fitting slot 4 easily even when the accuracy of the widthwise positioning is not very high, and the state shown in Figure 5 can be reached without encountering any substantial friction.
  • the positioning projection 5 and the positioning recess 9 are in mutual alignment as shown in Figure 5, by pushing the terminal piece 10, the positioning projection 5 fits into the positioning recess 9 while the lower part of the terminal piece 10 is fitted into the lower portion 4b of the fitting slot 4 as shown in Figure 6. Since the boundary between the upper portion 4a and the lower portion 4b is defined by the sloping step 19, the fitting edge 3 of the terminal piece 10 would not be caught by the sloping step 19 as it is fitted fully into the lower portion 4b.
  • the positioning projection 5 fits into the positioning recess 9 before the lower portion of the terminal piece 10 is fitted into the lower portion 4b of the fitting slot 4 while the positioning projection 5 shifts relative to the positioning recess 9 by sliding over the bottom surface 4c of the fitting slot 4 in the direction indicated by the arrow B.
  • Figure 8 shows an alternate embodiment of the fitting slot 4 according to which the upper portion 4a of the fitting slot 4 is progressively narrower towards its lower part so that the terminal piece 10 fitted into the upper portion 4a may be easily guided into the lower portion 4b.
  • the fitting process can be performed in a smooth fashion.
  • the fitting of the terminal piece into the fitting slot involving some widthwise positioning and the fitting of the positioning projection into the positioning recess can be both accomplished in a smooth fashion, mounting of the terminal piece on the casing can be thereby accomplished smoothly and without damaging the casing.
  • Cavities 7a or grooves provided in intermediate parts of the fitting slots 4 are flux pockets for stopping the infiltration of flux along the gap between the terminal pieces and the wall surfaces of the fitting slots 4 at the time of soldering.
  • Grooves 7a are provided in the outer side surface 1a of each side end of the resin casing 1 which contacts the inner surface of the upright wall portion 31, over its entire width, in parallel with the bottom surface 5 of the resin casing 1 from which the terminal portions 6b, 8b and 10b of the terminal pieces 6, 8 and 10 project.
  • the flux When flux is applied to the terminal portion 10b of the terminal piece 10 as a step preceding the soldering of a lead wire to the terminal portion 10 and some of it has clung to the bottom surface 5, the flux may enter the gap 4d defined between the terminal piece 10 and the wall surface of the fitting slot 4, but, since the cavity 7a is formed in an intermediate part of the gap 4d, the flux is intercepted by this cavity 7a without reaching the switch movement space 14.
  • the flux also infiltrates through the gap between the side surface 1a of the resin casing 1 and the opposing surface of the resin casing 21, but, since the groove 7b is provided in an intermediate part of the side surface 1a, the flux cannot advance any further whereby the possibility of the flux reaching the switch movement space 14 along the outer side surface 1a of the resin casing 1 can be positively prevented.
  • the flux which is used in soldering lead wires to the terminal portions of the terminal pieces is intercepted by the flux pocket provided in the fitting gap of the casing halves even when the flux has entered this fitting gap.
  • flux for the soldering of lead wires to the terminal pieces is prevented from entering the interior of the casing through the fitting gap between the casing halves, whereby there is provided small electric apparatus which can prevent operation failure of the contact mechanism due to the infiltration of flux.
  • the support projection 2c ( Figure 1) of the upright wall 12 for supporting the bent portion of the upper portion 6a of the terminal piece 6 is shaped as an ordinary base having a relatively large width in the same way as in conventional arrangements, but the support projection 2a of the block portion 2 corresponding to the deformable projection for supporting the lower surface of the upper portion 6a consists of a relatively narrow ridge having a pair of grooves 2b on either side thereof.
  • the support projection 2a is made weaker than the support portion 2c by constructing the support projection 2a as a narrow ridge, and, by taking into account the fact that the ridge is even more reduced in rigidity by providing grooves on either side thereof to make the support projection even more elongated in shape.
  • the large force applied by the terminal piece 6 to the support projections 2c and 2a is prevented from causing deformation to the upright wall 12 as the relatively compliant support projection 2a is first deformed by collapsing, thereby reducing the force applied to the support projection 2c.
  • Figure 12 shows an alternate embodiment of the present invention, in which the free end of the support projection 2a is tapered in such a manner as to cause collapsing deformation to occur more easily.
  • Those parts of Figure 12 corresponding to those of Figure 11 are denoted with like numerals.
  • the present embodiment since, even when a large pressure is applied from the metallic member to the resin casing, the pressure is not transmitted to the compliant parts of the resin casing by deformation of the deformable projection, the deformation of the casing is positively prevented and the accurate positioning of the metallic member in a prescribed position of the resin casing is made possible.
  • each of the terminal pieces 6, 8 and 10 is provided with a pair of lateral extensions 17a on either side of its free end or adjacent to its contact point 20, 22 or 24. These extensions 17a serve as fins for dissipating heat therefrom. This effect is improved when the terminal pieces are plated with silver and other heat conductive material.
  • the casing halves 1 and 21 are provided with local recesses 17b to accommodate the extensions 17a therein. Therefore, the thickness of the casing halves 1 and 21 is reduced only at these local recesses 17b, and the dimensions of the casing are thus not increased without in any diminishing the mechanical strengths of the casing halves 1 and 21.
  • numeral 31 denotes engagement portions which are partly removed, as opposed to the engagement portions of a comparable conventional push-button, in such a manner that a vertical continuous surface is defined on a part of each of its side surfaces.
  • the parts of the lower fringe 35 of the mounting opening 28 cooperating with the engagement portions 31 of the push-button 26 which oppose the cut-­off surfaces 34 when the push-button 26 is fitted into the mounting opening 28 are provided with extensions 36 defining sliding surfaces 35a for the push-button 26.
  • the inner side surfaces 37 of the mounting opening 28 corresponding to the outer side surfaces 33 of the push-button 26 are given with larger vertical dimensions than the other parts.
  • the upper fringe of the mounting opening 28 corresponding to the lower fringe 35 is provided with shoulder portions 38 in a depressed relationship.
  • Figure 18 is a sectional view showing the way the push-button 26 is fitted into the mounting opening 28; the push-button 26 is urged upwardly from below by the moveable piece 18, and is engaged by the lower fringe 35 of the mounting opening 28 at its engagement portions 28.
  • the cut-off surfaces 34 are provided in the push-button 26 and the sliding surfaces 36a are provided in the mounting opening 28, the outer side surfaces 33 of the push-­button 26 and the inner side surfaces 37 of the mounting opening 28 oppose each other over the long distance A defined by the sliding surfaces 34a and 36a. In other words, the sliding distance is increased from B to A.
  • the push-button 26 can move without rocking and, hence, without sticking by virtue of the long sliding distance achieved as described above, but, in reality, a slight rocking of the push-button 26 is inevitable.
  • the upper parts 39 of the side surfaces collide with the upper end of the mounting opening 28, and these surfaces tend to wear off in time as a result of numerous occurrences of collision, ultimateiy, until the satisfactory operation of the push-button 26 becomes impossible.
  • the shoulder portions 38 are provided for avoiding such wears resulting from repeated collisions by removing and the part of the upper end of the mounting opening with which the side portions 39 would collide as the push-button 26 is moved.
  • a certain margin of displacement or MD (the difference between the stroke of the push-button required for closure of the contact points and the return stroke of the push-button required for opening the contact points from their closed state), and such an MD varies depending on the point of pressure application on the moveable piece 18 by the push-button 26.
  • the MD is not the same for a push-button 26 in which the contact point 40 of the moveable piece 18 is substantially displaced from the pressure application point 41 as was the case in the above described embodiment and for a push-button in which the contact point 40 is situated right under the pressure application point 41 as shown in Figure 19.
  • the sliding structure for guiding the movement of the push-button provides sliding surfaces which are longer than was possible heretofore, the push-button can be moved without involving the rocking movement of the same.
  • the sliding surfaces are provided in the parts from which the engagement portions are removed, the overall length of the push-­button is not required to be increased, and the vertical dimension of the mounting opening is also not required to be increased, so that the dimensions of the microswitch are in no way increased.
  • a microswitch which is compact and permits its push-button to be operated in a stable fashion without sticking.
  • Figures 20 and 21 show the return spring 16 consisting of a sheet spring and its mounting structure in greater detail.
  • the base end 16b of the return spring 16 is bifurcated by being provided with a central notch 41 which is received by a pair of recesses 8c provided in the internal end 8b of the terminal piece 8 which are separated by a central portion 42.
  • the bifurcated base end 16b of the return spring 16 is received by the recesses 8c, and the central portion 42 is received by the central notch 41 at the base end 16b of the return spring 16.
  • This structure virtually eliminates the possibility of inadvertent disengagement between the return spring 16 and the terminal piece 8.
  • the free end 16a of the return spring 16 is engaged to the moveable piece 18.
  • the widths W1, W2 and W3 of the middle part, the free end and the base end of the return spring 16 are determined so that the relationship W1 > W2 and W1 > W3 holds. This is advantageous because the middle part is subjected to the largest stress during its operation.
  • Figure 22 shows an alternate embodiment of the structure for supporting the base end 16b of the return spring 16.
  • the base end 16b of the return spring 16 is provided with a central projection 43 instead of the notch 41 shown in Figures 20 and 21, and the internal end of the terminal piece 8 is provided with a pair of recesses 8c which are separated by an even deeper recess 44 instead of the planar central portion 42 shown in Figure 20.
  • This embodiment can produce substantially the same effect as the embodiment shown in Figure 20 in ensuring the engagement between the return spring 16 and the internal end 8b of the terminal piece 8.
  • the base end of the moveable piece 18 consists of a lateral plate 51 extending laterally across the entire width of the moveable piece 18 defining a central opening 51a.
  • the free end of the tab 8a which is bent from a central part of the terminal piece 8 is made narrower by a pair of shoulder surfaces 53 defined on either side of the tab 8a.
  • the rear surface of this narrower free end of the tab 8a is provided with a lateral groove 52 extending over its entire width.
  • the free end of the tab 8a is passed through the central opening 51a of the moveable piece 18 and the lateral plate 51a is engaged by the lateral groove 52. Since the moveable piece 18 is urged toward its free end by the return spring 16, the moveable piece 18 is securely engaged by the tab 8a. Further, since the moveable piece 18 is supported by the base end of the push-button 26 and the shoulder surfaces 53, the moveable piece 18 is positively prevented from inadvertently coming off from the tab 8a of the terminal piece 8.
  • Figure 24 shows a modified embodiment of the support structure for the moveable piece 18. According to this embodiment, only one shoulder surface 54 is provided but this embodiment can offer substantially the same effect as the embodiment shown in Figure 23.
  • the lateral sides of the moveable piece 18 are each retained by a pair of mutually opposing shoulder surfaces 55. According to this embodiment, even more secure retention of the base end of the moveable piece 18 is possible.
  • a shoulder surface 56 is provided in the rear surface of the free end of the tab 8a.
  • the lateral plate 51a is provided with an inwardly directed projection 57 which can be fitted into a central opening 58 provided in a middle part of the groove 52.
  • the projection 57 is engaged by the opening 58, and can positively retain the base end of the moveable piece in position.
  • a depression 67 having a flat bottom surface is provided in each of the corresponding corner portions of the two casing halves, and the bottom surfaces of the depressions 67 are each provided with a pair of pivot pins 29 serving as pivotal support portions one next to the other.
  • Numeral 61 denotes an actuator which is provided with a pair of pivotal support pieces 62 bent from one end thereof, and these pivotal support pieces 62 are provided with pivotal support openings 63 serving as pivoted portions for mounting the actuator 61 on the casing by fitting these pivotal openings 63 onto the pivot pins 29.
  • the actuator 61 is further provided, adjacent to the pivotal support pieces 62, with pressure application part 64 which is stamp formed so as to project downwardly for pressing the button portion 41 of the push-button 26, and a working end 65 which is intended to cooperate with conveyed articles is provided on the side of the actuator 61 opposite to the pivotal support pieces 62.
  • each of the pivotal support pieces 62 of the actuator 61 defining a rotary outer peripheral surface is provided with a rounded shape at its first corner portion 72a but defines a rectangular corner at its second corner portion 72b. Further, the part of the second corner portion 72b projecting from the rotary peripheral boundary A indicated by the dotted line forms a positioning engagement portion 68 of the actuator 61.
  • the part of the wall surface rising from the bottom surface of the depression 67 and facing the pivot pins 29 of the casing so as to oppose the lower edge 72 of each of the pivotal support pieces 62 is formed by a pair of sloping surfaces 69 which present a same distance and inclination with respect to the corresponding pivot pins 29 and mutually connected by a stepped portion 70.
  • the pressure from a conveyed article 80 applied to the working end 65 of the actuator 61 causes the actuator 61 to be pushed up as shown in Figure 30, and its pressure application portion 64 presses the button portion 41 of the push-button 26.
  • the working end 65 rotates downwardly under its weight, and releases the pressure upon the button portion 41.
  • This rotation is carried out with the first corner portions 72 of the pivotal support pieces 62 without contacting the sloping surfaces 69 owing to the relationship Y ⁇ X.
  • a further rotation of the actuator 61 causes the second corner portions 72b serving as the positioning engagement portions to contact and engage with the sloping surfaces 69 owing to the relationship X ⁇ Z.
  • the actuator 61 is positioned at an orientation which aligns with the inclination of the sloping surface 69.
  • the uniform positioning of the actuator in its free state is ensured, and the impact to the actuator as a conveyed article collides with the actuator 61 is controlled to a desired magnitude.
  • each of the depressions 67 of the casing was provided with a pair of pivot pins 29, and these were provided so as to be selectively used by taking into account the pressure stroke of the actuator 61 that is desired in each particular application.
  • the positioning projection of the actuator engages with the corresponding surface of the casing.
  • the position of the actuator is secured in its free state, by using it in such a positioned state as to cooperate with articles which are to be conveyed, the impacts upon the microswitch can be reduced with the result that there is provided an actuator mounted type microswitch which can be used in a stable fashion irrespective of its orientation.

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  • Push-Button Switches (AREA)
EP19890110031 1988-06-03 1989-06-02 Mikroschalter Withdrawn EP0344800A3 (de)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP7442988U JPH01177843U (de) 1988-06-03 1988-06-03
JP74431/88U 1988-06-03
JP7443188U JPH0628747Y2 (ja) 1988-06-03 1988-06-03 樹脂製ケーシングにおける金属部材の位置決め支持構造
JP74429/88U 1988-06-03
JP74432/88U 1988-06-03
JP1988074432U JPH071704Y2 (ja) 1988-06-03 1988-06-03 端子金具の取り付け構造
JP7497788U JPH01177836U (de) 1988-06-06 1988-06-06
JP74977/88U 1988-06-06
JP7497688U JPH01177826U (de) 1988-06-06 1988-06-06
JP74976/88U 1988-06-06

Publications (2)

Publication Number Publication Date
EP0344800A2 true EP0344800A2 (de) 1989-12-06
EP0344800A3 EP0344800A3 (de) 1991-07-17

Family

ID=27524508

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890110031 Withdrawn EP0344800A3 (de) 1988-06-03 1989-06-02 Mikroschalter

Country Status (1)

Country Link
EP (1) EP0344800A3 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2671660A1 (fr) * 1991-01-11 1992-07-17 Sextant Avionique Levier de microrupteur.
DE9305073U1 (de) * 1993-04-02 1993-06-09 Schaltbau AG, 81677 München Mikroschalter
DE4418707A1 (de) * 1994-05-28 1995-11-30 Teves Gmbh Alfred Schnappschalter mit gerader Bewegung des Schaltstücks sowie Schaltersystem hierzu
EP4254454A1 (de) 2022-03-30 2023-10-04 Crouzet Gehäuse mit metallschuh
CN119132848A (zh) * 2024-11-13 2024-12-13 温州亿通自动化设备有限公司 一种可调作用力的微动开关

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GB1404310A (en) * 1972-01-21 1975-08-28 Otehall Ltd Electrical switches
US3803342A (en) * 1972-10-16 1974-04-09 Robertshaw Controls Co Switch housing assembly held together by swaged terminals
GB1442332A (en) * 1972-12-19 1976-07-14 Bulgin Co Ltd A F Housings for electric switches
US4097706A (en) * 1977-03-30 1978-06-27 Emerson Electric Co. Molded enclosure having zero draft openings formed in it
US4673778A (en) * 1985-02-05 1987-06-16 The Cherry Corporation Snap action switch

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2671660A1 (fr) * 1991-01-11 1992-07-17 Sextant Avionique Levier de microrupteur.
DE9305073U1 (de) * 1993-04-02 1993-06-09 Schaltbau AG, 81677 München Mikroschalter
US5453589A (en) * 1993-04-02 1995-09-26 Schaltbau Aktiengesellschaft Microswitch with non-enlarging, sealed electrical connections
DE4418707A1 (de) * 1994-05-28 1995-11-30 Teves Gmbh Alfred Schnappschalter mit gerader Bewegung des Schaltstücks sowie Schaltersystem hierzu
EP4254454A1 (de) 2022-03-30 2023-10-04 Crouzet Gehäuse mit metallschuh
FR3134248A1 (fr) * 2022-03-30 2023-10-06 Crouzet Boitier comportant une cosse metallique
CN119132848A (zh) * 2024-11-13 2024-12-13 温州亿通自动化设备有限公司 一种可调作用力的微动开关

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