EP0017572B2 - Temperaturabhängig betriebener elektrischer Schalter - Google Patents

Temperaturabhängig betriebener elektrischer Schalter Download PDF

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Publication number
EP0017572B2
EP0017572B2 EP19800400421 EP80400421A EP0017572B2 EP 0017572 B2 EP0017572 B2 EP 0017572B2 EP 19800400421 EP19800400421 EP 19800400421 EP 80400421 A EP80400421 A EP 80400421A EP 0017572 B2 EP0017572 B2 EP 0017572B2
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EP
European Patent Office
Prior art keywords
switch
lever
cam
contact
finger
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
EP19800400421
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English (en)
French (fr)
Other versions
EP0017572A1 (de
EP0017572B1 (de
Inventor
Yves Boisot
Daniel Bontemps
Georges Duhamel
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.)
Electromecanique Du Nivernais - Selni Te N Ste
Original Assignee
ELECTROMECANIQUE DU NIVERNAIS - SELNI Ste
Thomson-Brandt SA
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26221096&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0017572(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from FR7908791A external-priority patent/FR2453489B1/fr
Application filed by ELECTROMECANIQUE DU NIVERNAIS - SELNI Ste, Thomson-Brandt SA filed Critical ELECTROMECANIQUE DU NIVERNAIS - SELNI Ste
Publication of EP0017572A1 publication Critical patent/EP0017572A1/de
Application granted granted Critical
Publication of EP0017572B1 publication Critical patent/EP0017572B1/de
Publication of EP0017572B2 publication Critical patent/EP0017572B2/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/2607—Means for adjustment of "ON" or "OFF" operating pressure
    • H01H35/2614—Means for adjustment of "ON" or "OFF" operating pressure by varying the bias on the pressure sensitive element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/2607—Means for adjustment of "ON" or "OFF" operating pressure

Definitions

  • the present invention relates to an electric switch operating as a function of temperature.
  • Such an electrical switch is applicable to an operation control of refrigeration installations or apparatus.
  • This switch makes it possible to start or stop them consecutively under predetermined, adjustable conditions such as upper and lower temperature limits, allowed in these installations or devices.
  • a bellows filled with an expandable fluid, the volume variation of which is a function of the temperature of the enclosure of these installations or apparatuses, provides mechanical force, to the command to open or close the electrical contacts which condition the operation of these installations or devices.
  • the present invention intended to avoid the drawbacks of known devices, makes it possible to produce an electrical switch operating as a function of temperature, of the type applicable to the control of refrigeration installations or apparatus, not only simple in its structure, sensitive and silent in its operation, and adjustable in the stop position without providing great efforts but also economical in its manufacture, and having virtually and constantly clean electrical contacts.
  • an electrical switch operating as a function of temperature having in a housing sets of electrical contacts, one of which is abrupt, a bellows expandable as a function of temperature and a mechanical control assembly ensuring a connection mechanical between this bellows and these sets of electrical contacts, which mechanical assembly comprises at least one pivoting control lever provided with a maneuvering finger actuating by an attack surface the above set of abruptly breaking contacts, is, to reach the aforementioned object, characterized in that the control lever is substantially flat relative to the direction of expansion of the bellows and pivots about a transverse axis, parallel to its plane and lying, relative to the latter, in the same region of the space that the bellows is at a point situated between the part of the lever in connection with the expandable bellows and the operating finger, which is at the end of said lever, and in that the attack surface of the operating finger consists of two adjacent faces turned in the opposite direction to that in which, relatively to themselves, the control lever is located and one of which, perpendicular to the plane of the lever
  • the electrical switch 1 illustrated operating as a function of the temperature, comprises (FIG. 1) a housing 2 containing mechanical control members, and a switch proper 3 housing a mixed mechanism of electrical contacts with abrupt breaking and cleaning of these friction contacts, and electrical connection elements.
  • the housing 2 preferably made of metal sheet treated against corrosion, comprises on the one hand, a U-shaped side frame 4 forming an end wall and two side walls, and on the other hand, a front plate 5 and a rear cup 6 respectively closing the front and rear faces of the frame 4, the second end of the frame 4 being closed by the switch proper 3.
  • the frame 4 comprises (FIGS. 2 and 4) in the central zone of its end wall, two holes 7, 8 with a flared edge, and at the rear edge of this wall, two legs 9, 10 projecting towards the inside the frame 4, the holes 7, 8 and the legs 9, 10 symmetrical with respect to the longitudinal axis of the frame 4.
  • the frame 4 in a U is provided in the end of each of the branches of the U (FIG. 1), two notches 11, 12 separated by a central projection 13 which serves as a pin. of electrical earthing connection, and of two locking tabs 14, 15 framing these two notches.
  • the notches 11 and 12 are intended to receive corresponding bosses 16, 17 formed on the side walls of the base of electrically insulating material of the switch proper 3.
  • the front plate 5 comprises (FIG. 3), in the central zone, a hole 18 for the passage of an axis 19 of a flat cam 20, on the two sides, two tabs 21, 22 laterally folded inwards for serve as sliding slides for a cam follower 23, and on one side, a pin 24 intended for guiding this cam follower 23 in its sliding.
  • the plate 5 further comprises (FIG. 1), at its ends, two tabs 25, 26 intended for fixing the electrical switch 1.
  • the flat cam 20 comprises (FIGS. 2, 3) stiffening ribs 27, a square central hole 28 facilitating its driving by the axis 19, and a peripheral edge 29 constituting a cam profile ensuring the control for adjusting the operation of the switch 1.
  • the flat cam 20 made integral with the axis 19 is resiliently held in position by an elastic washer 30.
  • the cam follower 23 comprises a flat body terminated by an end folded in a square ( Figures 2, 3).
  • the flat body of the cam follower 23 is provided, in its surface, with a longitudinal cutout 31 which gives it the shape of a U, in the first branch 32 of this U, with a longitudinal slot 33 intended to receive the guide pin 24 of the front plate 5, and in the end of the second branch 34 of an extension folded at right angle 35.
  • the cam follower 23 is slidably mounted on the internal face of the plate 5, by insertion lateral edges of its flat body, in the two folded lateral tabs 21, 22 of this front plate 5, and by insertion of the pin 24 into its longitudinal slot 33.
  • the cam follower 23 slides its two branches on the two sides of the axis 19, and in the space defined by the front plate 5 and the cam 20.
  • the bottom of its cutout 31 can approach the axis 19 of the cam 20.
  • a perpendicular finger 36 is formed, in the bottom of this cutout 31, with a curved surface to facilitate the sliding of the profile of the cam 20.
  • This finger 36 has a height which, relative to the surface of the plate 5, exceeds the level of the flat cam 20 so that, during continuous application of this finger 36 against the profile 29 of this cam 20, a rotation of the latter cam causes a longitudinal sliding of the cam follower 23. The rotational movement of the cam 20 is thus transformed into translational movement of the cam follower 23.
  • the folded-back end of the body of the cam follower 23 is (FIG. 3) provided, in the central zone of its surface, with two holes 37, 38 with flared edges, for mounting an adjustment screw.
  • the rear bowl 6 closing the rear face of the frame 4 supports a bellows 39 which is extended outside of the switch 1 by a closed thin tube 40.
  • the bellows 39 and the thin tube 40 contain a known, expandable fluid.
  • the bellows 39 increases in volume when the temperature rises.
  • this bellows 39 decreases in volume when this temperature drops.
  • the end part of the thin tube 40 is arranged in the zone where the temperature controls the operation of the switch 1. This zone is either a storage compartment where a relatively constant temperature must be maintained, an evaporator of a refrigeration system.
  • the change in volume of the bellows 39 in fact results in a change of position of its bottom 41.
  • the translational movement of the bottom 41 of the bellows 39 is adjusted, changed direction at an angle of approximately 90 ° and transformed into a control force for the mixed mechanism of abrupt breaking electrical contacts and for cleaning these contacts by friction, the switch itself 3, by means of a mechanical assembly comprising, at least, a pivoting control lever 42, provided with an electrically insulating actuating finger 43, and recalled by a tension spring with adjustable tension 44 (FIG. 2).
  • the pivoting control lever 42 (FIGS. 2 and 5) comprises a relatively flat body 46 provided on one of its faces, with two perpendicular lateral tabs 47, 48, with a central boss 49 and in the vicinity of the latter, on the edge of this body 46, a lateral recess 50.
  • the lateral tabs 47, 48 are provided with lateral knives 51, 52 which allow the control lever 42 to pivot in bearings constituted by substantially trapezoidal openings 53 formed in the walls side of the frame 4.
  • the central boss 49 allows the lever 42 to make mechanical contact with the bottom 41 of the bellows 39.
  • This control lever 42 comprises on the second face of its body 46, at the two ends thereof, perpendicular fins 54 and 55, and in the vicinity of the fin 54, two spaced holes 56, 57 for fixing operating finger 43.
  • the fin 54 comprises (FIG. 2) in one end of its edge a notch 58 which transforms it. hook attachment of one end of the tension spring 44.
  • the second end of the spring 44 is made integral with a nut 59 with a screw adjustment 45 which is mounted in one of the flared edge holes 37 of the cam follower 23.
  • the operating finger 43 is mounted on the end of the control lever 42 ( Figure 2).
  • the finger 43 made of an electrically insulating material comprises a base 61.
  • This base 61 is provided with two pins 60 which, by introduction into the holes 56, 57 and, by crimping or screwing, allow this finger to be firmly fixed to the lever 42.
  • the finger 43 further comprises a leading wall 62 which covers, on one side the end of the fin 54 and its notch 58, and touches, on the opposite side, a lever of the mixed contact mechanism sudden break and cleaning of these contacts by friction of the switch itself 3.
  • a flared entry, terminated by a constriction 63 is formed between the fin 54 and the leading wall 62 of the finger 43.
  • This throttling preferably has a dimension slightly less than the diameter of the wire constituting the end of the spring 44, so that, thanks to a relative elasticity of the wall 62 of the finger 43, the end of the spring 44 in the form of a ring or hook closed, once forced into the notch 58 can not easily get out of it, without performing a special operation.
  • the switch itself 3 comprises a hollow base 64 of electrically insulating material, through the bottom 65 of which are mounted a fixed electrical contact support strip 66, a movable electrical contact support strip 67 and a screw for adjusting movable electrical contact, called differential screw 68.
  • the fixed contact support strip 66 comprises an outer end 69 serving as a male electrical connection element and an inner end carrying a fixed electrical contact 70 (FIG. 2).
  • the movable contact support strip 67 comprises (FIGS.
  • the switch proper 3 comprises a mixed mechanism of electrical contacts with sudden break and cleaning of contacts by friction (FIG. 2).
  • This mechanism comprises (FIGS. 6 and 7) an elastic deformation blade 78, a pivoting lever 79, and the support bar 67.
  • the blade 78 consists of an elastically flexible metal sheet, substantially rectangular, provided with a central cutout 80 U-shaped giving rise to a central tongue 81, and two longitudinal edges 82 folded perpendicular to its faces.
  • One 83 of the ends of the blade 78 is folded at an acute angle relative to the plane of this blade, in the same direction as that of the longitudinal edges 82 and the second end 84 of this blade 78 carries a hole for fixing 'a movable electrical contact 73.
  • the central tongue 81 of the blade 78 is slightly arched (FIG. 7) in the direction of its length and folded outwards from the plane of the blade 78 at an acute angle and in the same direction as that of the longitudinal edges 82.
  • the pivoting lever 79 comprises (FIGS. 2, 9) in its central zone, a recess 88 serving as a pivoting seat for the inner edge of the end 83 of the resiliently deformed blade 78.
  • This recess 88 may consist of a fold formed by folding a lug 87 from a cutout 86 made in the central zone of the lever 79.
  • the lever 79 comprises, in its half which extends the cutout 86, a lever arm 89 which is capable of being mounted at through the T-shaped notch of the end 72 of the support bar 67, and on the two edges of this lever arm, cut in steps, knives 90 and 91 allowing the lever 79 to pivot on this end 72.
  • the lever 79 comprises, at the end of its other half, a tail 92 which, cooperating with stop stops constituted by the walls of a recess 93 in the bottom 65 of the base 64, limits the amplitude of its pivoting.
  • the end of the lever arm 89 is (FIG. 2) preferably curved to form a rounded shape which facilitates its sliding on the face of the leading wall 62 of the maneuvering finger 43.
  • the blade with elastic deformation 78 is threaded on the end 72 of the support strip 67.
  • the free end of the tongue 81 of this blade 78 is arranged in the hollow 85 of this support bar 67 while the inner edge of the end 83 of this blade 78 is engaged in the hollow 88 of the lever 79, pivotally mounted on the end 72 of the support bar 67.
  • the blade with elastic deformation 78 remains in its rest state (FIGS.
  • the tongue 81 retained by this recess 85 of this support strip 67, which cannot follow the movement of the end 83 of blade 78 is forced to curl and line up in a new stable position. Indeed, at a certain degree from the distance from the end 83 of the blade 78, the passage of the end of the tongue 81 through the central cutout 80 occurs on the other side of the blade plane 78. This crossing causes an abrupt tilting of the body of the blade 78, translating the sudden passage from an initial stable position (FIGS. 7, 12) to a new stable position (FIG. 11). In this new stable position, the tip of the tongue 81 is on the second side of the plane of the blade 78, the right side of this blade (FIG.
  • the actuating finger of insulating material 43 comprises in its leading wall 62, a zone of mechanical contact with the lever arm 79 of the mixed mechanism of electrical contacts with abrupt break and of cleaning of these contacts by friction, consisting of at least two adjacent surfaces, a flat surface 94 perpendicular to the plane of the flat body 46, of the lever 42, and a surface 95 inclined towards the outside of this lever 42, forming an obtuse angle with the body 46 of the latter.
  • the flat surface 94 serves as a mechanical contact surface with the lever arm 89 when the blade 78 is at rest (FIG.
  • the inclined surface 95 serving as a mechanical contact surface with the lever arm 89, according to the invention ensures an increase in the efficiency of the movement of the control lever 42 in the actuation of the lever 79 of the switch itself 3 , in other words an increase in sensitivity of switch 1.
  • the differential screw 68 mounted in the bottom 65 of the base 64 of the switch 3 is intended to adjust the spacing between the movable electrical contact 73 carried by the elastic deformation blade 78 and the fixed electrical contact 70 carried by the strip of electrical connection 66.
  • the screw 68 By turning the screw 68 to bring the electrical contact 73 closer to the electrical contact 70, the plane of the blade 78 is brought closer at the same time to the free end of the tongue 81, in other words the blade 78 is brought closer to its position d unstable balance. This unstable equilibrium position is reached when the plane of the blade 78 is coincident with the plane of the free end of the tongue 81.
  • a small temperature difference is sufficient to cause the blade 78 to tip over and the contacts 70, 73.
  • the screw 68 thus makes it possible to adjust the engagement, consequently, to determine the difference in deviation between the engagement and the trigger.
  • the switch proper 3 ( Figures 13, 15) comprises in addition to the fixed electrical contact 70 and the movable electrical contact 73 a second fixed electrical contact 96 and a second movable electrical contact 97
  • the fixed electrical contact 96 is maintained by a flexible blade 98 fixed to the base 64, for example, by means of the extension 76 of the support bar 67, and made adjustable in position by an adjustment screw 99.
  • the contact mobile electric 97 is carried by a flexible blade 100, fixed to a connection strip 101.
  • the blade 100 has a rest position shown in solid lines in FIG. 14 or in broken lines in FIGS. 15. In this rest position the movable electrical contact 97 is separate from the fixed electrical contact 96.
  • the operating finger 43 of the control lever 42 is, in this variant, laterally provided with an extension 102 (FIG. 13) which is in mechanical contact with the flexible blade 100 carrying the movable electrical contact 97.
  • the finger 43 under the control of the lever 42 actuates the lever 89 of the mechanism of electrical contacts with sudden break and cleaning of these contacts by friction of the switch itself 3 , and its extension 102 closes the electrical contacts 96, 97 by pushing the blade 100 ( Figures 14, 15).
  • the screw 99 makes it possible to adjust the instant of closure of these electrical contacts 96, 97 for a determined temperature increase.
  • the actual switch 3 comprises, in addition to the electrical contacts 70 and 73, two electrical contacts, similar to the electrical contacts 96 and 97 of the first variant (FIG. 15), one fixed 103 and the other mobile 104.
  • the fixed electrical contact 103 is carried by a support 105.
  • This support 105 comprises an end in the form of a blade fixed to the base 64, for example, by means of the extension 76 of the support bar 67, and another end, having a cross section in C on the internal face of which is fixed the fixed contract 103.
  • the support 105 flexible at its blade-shaped end is made adjustable in position by the adjusting screw 99.
  • the movable contact 104 is carried by a flexible blade 106 fixed to the connection strip 101. The position of the movable electrical contact 104 is controlled by the extension 102 of the operating finger 43 in mechanical contact with the blade flexible carrier 106.
  • FIG. 17 a third alternative embodiment of the invention, illustrated in FIG. 17, the parts and elements identical to those of the first exemplary embodiment bear the same reference numbers. These parts and elements of these two embodiments have identical mounting methods and relative arrangements, except for the screw 45 for adjusting the tension of the spring 44 which, in this third variant embodiment, is mounted in one of the holes to flared edge 7, 8 of the frame 4, instead of being held in one of the flared edge holes 37, 38 of the cam follower 23.
  • the switch 1 comprises a pivoting trigger lever 107, recalled by a tension spring 108, and having a displacement limited by a stop.
  • This lever 107 comprises a long body having a section. transverse in L
  • One of the wings 109 of L of this body is provided in its central zone, with. boss 110, projecting laterally outwards (FIG. 18).
  • This boss 110 is intended to cooperate with the lateral recess 50 of the control lever 42 (FIG. 17).
  • the body of the lever 107 is provided in its second wing 111 with an end 112 folded twice at an angle to substantially form an S.
  • the end 112 includes a hole 113 for mounting one of the ends of the tension spring 108.
  • the body of the lever 107 comprises a second end 114 folded in the direction opposite to that of the wing 111 of its body.
  • the end 114 comprises two lateral legs 115, 116 resting on the support legs 9, 10 of the frame 4 of the housing 2 (FIG. 4) and serving as knives for the pivoting of the lever 107.
  • the trigger lever 107 is mounted in the housing 2, its boss 110 being disposed in the hollow 50 of the control lever 42 and its end 112 being pulled by one of the ends of the spring.
  • tension 108 the second end of which is made integral with a nut 117 of an adjustment screw 118.
  • the screw 118 is mounted in one of the flared-edge holes 37, 38 of the cam follower 23.
  • the tension spring 108 tends to rotate the lever 107 around its legs 115 and 116, and lift the control lever 42 via its boss 110 engaged in the hollow 50 of this lever 42.
  • the trigger lever 107 is limited in its movement lifting lever 42, by a stop constituted by an adjustable lug 119, cut in the frame 4 ( Figures 4, 17) and folded inwardly of this frame. This movement of the lever 107 is stopped when its notch 120 abuts against the lug 119 ( Figure 17).
  • the trip lever 107 thus tends more or less to delay the action of the control lever 42 in the trip of the switch itself 3.
  • the switch proper 3 comprises, in addition to the electrical contacts 70, 73, two other electrical contacts, similar to the contacts 96 and 97 of the first alternative embodiment (FIG. 15), one fixed 121 and the other mobile 122 ( Figures 21, 24).
  • the fixed contact 121 is fixed, for example, on the extension 76 of the support strip 67, and the mobile electrical contact 122 is carried by a flexible blade 123 fixed to a connection strip 124.
  • the strip 124 comprises (FIG. 22) an outer end 125 serving as a male electrical connection element and an inner end 126 carrying the flexible blade 123 provided with a movable electrical contact 122. In its rest position, the blade 123 applies ( 24) constantly the movable electrical contact 122 against the fixed electrical contact 121.
  • the cam follower 23 is mechanically connected to an electrically insulating finger 127 sliding in a housing 128 of the base 64 of the switch proper 3 ( Figures 17, 21, 23).
  • the finger 127 comprises (FIG. 23) a flat body 129 provided, on one of its faces, with a perpendicular lug 130 at one of its ends, and with a hook 131 allowing its attachment to the extension folded at right angle 35 of the follower of cam 23.
  • a fifth alternative embodiment below makes it possible to avoid this additional effort in the rotation of the cam 20 when the switch described in above is put into position.
  • an electrical switch 140 (FIG. 25) comprises, in place of the cam 20 a new angularly pivoting cam 141 associated with a new control lever 143 which acts on the switch proper 3.
  • the cam 141 cooperating with the cam follower 23, comprises (FIGS. 26 and 27) in its central zone a square hole 144 intended for its rotation drive by the axis 19 and on the periphery on the one hand an edge 145 occupying the almost the entire periphery of the cam, serving as an operating control control profile for the switch 140, and on the other hand a flat lug 146 parallel to its surface, projecting radially and axially with respect to this edge or profile 145 and being located at a relatively straight starting zone 147 of this profile 145, this flat lug constituting a means for blocking the control lever 143 in a “stop switch 140” position.
  • the profile or edge 145 of the cam 141 can, depending on the setting mode of the switch 140, move closer and closer (figures 26 and 27) gradually and radially from the axis of rotation 19 of the cam 20 but still known usually a low amplitude.
  • the cam 141 is mounted on a front plate 142.
  • This front plate 142 illustrated in FIGS. 25, 28 and 29 also having lugs 21, 22, the pin 24 for the sliding of the cam follower 23 and lugs 25, 26 for fixing the switch 140 comprises several elastic claws 149, regularly spaced around the axis 19 and having their free ends projecting on its inner face, their other ends remaining attached to the plate.
  • These claws 149 are obtained in the front plate 142 by cutting the latter, for example according to the stamping technique. These elastic claws 149 play the role of the elastic washer 30 in the switch 1 for taking up play in the assembly of the cam 141 and its axis 19 on the switch 140. These elastic claws 149 always remaining attached to the plate 142 have the advantage of not being lost during the assembly of the cam 141 and of being obtained economically by simple stamping of the plate 142.
  • the pivoting control lever 143 (FIGS. 25 and 30) comprises a relatively flat body 150 provided, on one of its faces, with two perpendicular lateral legs 151, 152 and a central boss 153.
  • the lateral legs 151 and 152 are provided side knives 154 and 155 which allow the lever 143 to pivot in bearings formed by substantially trapezoidal openings 53 formed in the side walls of the frame 4.
  • the boss 153 makes mechanical contact between the bottom 41 of the bellows 39 and the lever 143 .
  • This control lever 143 comprises on the second face of its body 150, and at one of its ends, a perpendicular fin 156 and in the vicinity of this fin one or more holes 157 for fixing a finger operating 43.
  • the fin 156 comprises (FIG. 25) in one end of its edge a notch 158 which transforms it into a hook for attachment to one of the ends of the tension spring 44, the other end of this spring being made integral with a nut 59 of an adjustment screw 45 which is mounted in one of the holes 37 of the cam follower 23.
  • the control lever 143 further comprises, on this second face of its body 150, in the vicinity of the level of the central boss 153, a perpendicular arm 159 intended mainly, when placing the switch 140 in the "stop” position by rotation of the cam 141, to cooperate with the lug 146 of this cam which pushes and blocks the control lever 143 in a position where the finger 43 of this lever does not exert practically no pressure on the snap mechanism 67, 78, 79.
  • the force used for the rotation of the cam 141 is therefore usually low.
  • the lug 146 of the cam 141 simultaneously encounters in its path the arm 159 of the lever 143, pushes it so as to tilt this lever 143 into a "stop where his finger 43 practically exerts no pressure on the lever arm 89, and causes the opening of the electrical contacts 70, 73 of the switch proper 3.
  • the switch 140 is thus put in a "off” position without requiring no additional effort to that normally required in the operating setting of the switch, by rotation of the cam 141.
  • the actual switch 3 comprises in addition to the electrical contacts 70, 73 (FIG. 25) two electrical contacts, one fixed 103 and the other mobile 104 respectively carried by supports 105 and 106 like those of switch 1 (figure 31).
  • the switch 140 further comprises on the one hand a cam 141 (FIGS. 25, 26, 27, 31) provided with a second lug 160 substantially diametrically opposite the lug 146 relative to the axis of rotation of the cam, and projecting axially in the same direction as that of the lug 160, and on the other hand an insulating lever 161 constituting a mechanical connection means between this second lug 160 and the electrical contacts 103 and 104.
  • a cam 141 (FIGS. 25, 26, 27, 31) provided with a second lug 160 substantially diametrically opposite the lug 146 relative to the axis of rotation of the cam, and projecting axially in the same direction as that of the lug 160
  • an insulating lever 161 constituting a mechanical connection means between this second lug 160 and the electrical contacts 103 and 104.
  • the lever 161 made of electrically insulating and relatively elastic material comprises, at one end, feet 162, and at the other end an arm 163 and a finger 164.
  • the feet 162 are fixed against the walls of the base 64 of the switch proper 3.
  • the elasticity of the material which constitutes it allows the lever 161 to pivot more or less around these feet 162 to control, by its finger 164, the movement of the support 106 of the movable electrical contact 104 relative fixed electrical contact 103.
  • the arm 163 of the insulating lever 161 is disposed on the path of the second lug 160 of the cam 141 to be actuated by this lug during the rotation of this cam 141.
  • the arm 163 is connected to the body of the lever 161 so as to leave a free space 165 for the passage of this lug 146.
  • the switch itself 175 comprises (FIG. 32) a hollow base of electrically insulating material 166 in which are mounted two contacts, one fixed 167 and the other mobile 168.
  • fixed contact 167 is mounted on a connection strip 169.
  • the movable contact 168 is fixed on the end of an elastic support 170 mounted on a connection strip 171.
  • the elastic support 170 is constituted by an elastic metal blade (FIG. 34) provided with an H-shaped opening 171 which delimits two opposite tongues, a long 172 and a short 173.
  • a tilting spring 174 in the form of 'an omega is mounted between the free ends of these tabs 172, 173 to give the support 170 two stable positions.
  • the movable contact 168 carried by this support In the first stable position of the support 170 shown in solid lines in FIG. 32, the movable contact 168 carried by this support is applied to the fixed contact 167.
  • the movable contact 168 carried by this support separates from the fixed contact 167.
  • the switch proper 175 comprises, apart from the contacts 167 and 168 illustrated in FIG. 13, two other electrical contacts, one fixed 176 and the other mobile 177.
  • the fixed contact 176 is mounted on a connection strip 178.
  • the mobile contact 177 is fixed on the end of an elastic support 179 which is in turn mounted on a connection strip 180 (figure 33).
  • the elastic support 179 is constituted by an elastic metal blade, provided (FIG. 34) with a U-shaped opening 181 which delimits a central tongue 182.
  • the cam 141 is fixed to one end of an axis of rotation 182, mounted to rotate freely in a bushing 183 assembled on the front plate 142 of the housing the switch 140.
  • the axis 182 comprises a flat 184 facilitating its rotation drive.
  • the switch described above is simple in its structure, therefore economical in its manufacture. Its operation is efficient and silent. The fine adjustment is great. Its electrical contacts are practically and constantly clean thanks to the mixed mechanism of friction contacts. In addition, multiple assemblies of electrical contacts that can be made in its actual switch, increase the possibilities of using the switch 1.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermally Actuated Switches (AREA)

Claims (13)

1. Temperaturabhängig arbeitender elektrischer Schalter, der in einem Gehäuse (2) elektrischer Kontaktsätze, von denen einer (70-73) ein Abreißkontaktsatz ist, einen in Abhängigkeit von der Temperatur dehnbaren Balg (39) und eine mechanische Schalteinrichtung aufweist, die eine mechanische Verbindung zwischen diesem Balg (39) und diesen elektrischen Kontaktsätzen gewährleistet, wobei die mechanische Einrichtung mindestens einen schwenkbaren Schalthebel (42) mit einem Schaltfinger aufweist, der durch eine Wirkfläche den obengenannten Abreißkontaktsatz betätigt, dadurch gekennzeichnet, daß der Schalthebel (42) in Bezug auf die Ausdehnrichtung des Balgs (39) im wesentlichen flach ist und um eine Querachse schwenkt, die parallel zu seiner Ebene liegt und sich in Bezug zu dieser in dem gleichen Raumbereich wie der Balg (39) und gegenüber einem Punkt befindet, der zwischen dem mit dem ausdehnbaren Balg verbundenen Teil des Hebels und dem Schaltfinger am Ende des Hebels liegt, und daß die Wirkfläche des Schaltfingers sich aus zwei nebeneinanderliegenden Flächen (94, 95) zusammensetzt, die in entgegengesetzte Richtung zu der zeigen, in welcher sich, in Bezug auf sie selber, der Schalthebel (42) befindet, und von denen eine, (94), quer zur Ebene des Schalthebels (42) und parallel zu seiner Schwenkachse verlaufend, mit einem Hebel (79) des Mechanismus des Abreißkontaktsatzes in Berührung kommt, wenn dieser letztere sich in seinem ersten Zustand (offen oder geschlossen) befindet, während die andere (95), mit der ersten einen konkaven Zweiflächler bildet und mit dem Hebel (79) des Mechanismus des Abreißkontaktsatzes in Berührung kommt, wenn dieser letztere in seinen zweiten Zustand übergeht (geschlossen oder geöffnet), wobei die Kante des von den Flächen (94, 95) gebildeten Zweiflächlers parallel zur Schwenkachse des Schalthebels (42) und in Bezug auf diesen auf der anderen Seite liegt.
2. Schalter nach Anspruch 1, dadurch gekennzeichnet, daß er am Schaltfinger (43) dieses Schalthebels (42), der einen ersten (70-73) dieser elektrischen Kontaktsätze betätigt, einen seitlichen Fortsatz (102) aufweist, der die Steuerung eines zweiten (96-97, 103-104) dieser elektrischen Kontaktsätze gewährleistet.
3. Schalter nach einem der Ansprüche 1 und 2, dessen mechanische Schalteinrichtung einen Kurvenfühler (23) aufweist, der von einer Einstellkurvenscheibe (20) betätigt wird, wobei der schwenkbare Schalthebel (42) von einer Rückholfeder (44) beaufschlagt ist, deren Spannung mittels einer an einer Wand des Rahmens (4) des Schaltergehäuses (2) befestigten Einstellschraube (45) einstellbar ist, und, für eine Einrücksteuerung mit konstanter Regelung und Ausrücksteuerung mit einstellbarer Regelung dieser elektrischen Kontaktsätze, außer diesem schwenkbaren Schalthebel (42) einen schwenkbaren Ausrückhebei (107) aufweist, dessen Verschiebung durch einen mit dem Gehäuse (2) fest verbundenen Anschlag begrenzt ist, und eine Zugfeder (108) mit einer durch eine an dem Kurvenfühler (23) dieser Einstellkurvenscheibe (20) befestigte Einstellschraube (118) einstellbaren Spannung, die den Ausrückhebel (107) dauernd gegen den Anschlag drückt, dadurch gekennzeichnet, daß der Ausrückhebel (107) mit einem Vorsprung versehen ist, der in eine in dem Schalthebel (42), ausgebildete Vertiefung (50) eingreift, und daß er einen einstellbaren Anschlag (119) für diesen Hebel (107) und eine Zugfeder mit einstellbarer Spannung (118) aufweist, die den Ausrückhebel (107) zu diesem Anschlag (119) zieht, indem sie ihn in eine Richtung schwenkt, die entgegengesetzt zur Schwenkrichtung des Schalthebels (42) unter dem Druck des Balgs (39) ist.
4. Schalter nach einem der Ansprüche 1 bis 3, bei dem die mechanische Schalteinrichtung einen verschiebbaren Kurvenfühler (23), der durch eine Einstellkurvenscheibe (20) betätigt wird, und einerseits einen ersten (70-73) der elektrische Kontaktsätze, gesteuert durch den mit einem isolierenden Schaltfinger versehenen schwenkbaren Schalthebel (42), und andererseits einen zweiten (121-122) der elektrischen Kontaktsätze aufweist, die durch einen elektrisch isolierenden verschiebbaren Finger (127) trennbar sind, dadurch gekennzeichnet, daß er im verschiebbaren Kurvenfühler (23) eine Verlängerung (35) aufweist, die diesen verschiebbaren Finger (127) mitnimmt, um die Trennung dieser elektrischen Kontakte bei der Verschiebung des verschiebbaren Kurvenfühlers (23) durch Drehung der Einstellkurvenscheibe (20) zu bewirken, um den Schalter in eine Ausschaltstellung zu bringen.
5. Schalter nach Anspruch 1, dadurch gekennzeichnet, daß zur Ausbildung einer dreifachen Funktion, derjenigen der Einstellung der Arbeitsweise des Schalters, derjenigen der Blockierung eines Schalthebels (143) dieser mechanischen Schalteinrichtung, wenn der Schalter in die Stellung « Aus » gebracht wird, um die Wirkung des letzteren (Hebels) auf einen ersten (70-73) dieser Kontaktsätze aufzuheben, damit die Kontakte sich öffnen, ohne daß eine Kraft außer der zum Einstellen der Funktionsweise des Schalters erforderlichen nötig ist, und die der Öffnung eines zweiten (103-104) dieser Kontaktsätze gleichzeitig mit der Blockierung des Schalthebels (143) in einer « Aus »-Stellung des Schalters, der Schalter in dieser mechanischen Schalteinrichtung als Einstellkurvenscheibe eine einzige in einem Winkel schwenkbare Kurvenscheibe (141) aufweist, die in erster Linie mit einem Rand (145) ausgebildet ist, der als Steuerprofil zur Einstellung der Funktionsweise des Schalters dient und fast die Gesamtheit ihres Umfangs einnimmt, in zweiter Linie mit einer ersten flachen, zu ihrer Oberfläche parallelen Nase (146), die bezüglich ihres Randes oder Steuerprofils zur Einstellung der Funktionsweise des Schalters (145) radial und axial vorspringt und ein Blockierungsmittel für diesen Schalthebel (143) bildet, wenn der Schalter in die Stellung « Aus » gebracht ist, und in dritter Linie mit einer zweiten Nase (160) versehen ist, die bezüglich dieses Kurvenprofils (145) axial und im wesentlichen diametral entgegengesetzt zur ersten Nase (146) vorspringt und eine Schaltvorrichtung zum Öffnen dieses zweiten Kontaktsatzes (103-104) bildet.
6. Schalter nach Anspruch 5, dadurch gekennzeichnet, daß er als Vorrichtung zur Beseitigung des Montagespiels zwischen der Einstellkurvenscheibe (141) dieser mechanischen Schalteinrichtung und der Vorderplatte (142) dieses Gehäuses (2) des Schalters, welche die Drehachse (19) dieser Einstellkurvenscheibe trägt, in der Vorderplatte (142) geformte elastische Klauen (149) aufweist, die in regelmäßigen Abständen rings um die Achse (19) verteilt sind und deren freie Enden von der Oberfläche dieser Vorderplatte vorspringen.
7. Schalter nach Anspruch 5, dadurch gekennzeichnet, daß er zwei elektrische Abreißkontaktsätze aufweist, von denen der erste (167-168) mit einem beweglichen Kontakt (168) versehen ist, der am freien Ende einer metallischen Blattfeder (170) befestigt ist, die eine H-förmige Öffnung aufweist, welche zwei einander gegenüberliegende Zungen verschiedener Länge begrenzt, deren Enden durch eine Omega-förmige Kippfeder (174) verbunden sind, und der zweite (176-177) mit einem beweglichen Kontakt (177) versehen ist, der am freien Ende einer metallischen Blattfeder (179) befestigt ist, die eine Öffnung in Form eines umgekehrten U (180) aufweist, wobei sich die Basis des U auf der Seite befindet, die der Seite des beweglichen Kontakts (177) entgegengesetzt ist, und wobei die U-Öffnung eine Mittelzunge (182) begrenzt, gegen die ein Isolierhebel (161) in dieser mechanischen Schalteinrichtung mit Einstellkurvenscheibe drückt.
8. Schalter nach einem der Ansprüche 1, 2, 3, 4, 5 und 7, der in einem ersten (70-73) oder (167-168) dieser elektrischen Kontaktsätze einen festen Kontakt (70 oder 167) und einen von einem biegsamen Blatt (78 oder 170) getragenen beweglichen Kontakt (73 oder 168) aufweist, dadurch gekennzeichnet, daß er eine Schraube (68) aufweist, welche zur Einstellung der Lage dieses biegsamen Blattes (78 oder 170) bezüglich des festen Kontakts (70 oder 167) dient.
9. Schalter nach einem der Ansprüche 1, 2, 3, 4 und 5, der in einem zweiten (96-97 oder 103-104 oder 121-122) dieser Kontaktsätze einen von einem Halter (98 oder 105) getragenen festen Kontakt (96 oder 103 oder 121) und einen von einem biegsamen Blatt (100 oder 106 oder 123) getragenen beweglichen Kontakt (97 oder 104 oder 121) aufweist, dadurch gekennzeichnet, daß er eine Schraube (99) aufweist, welche zur Einstellung der Lage des Halters (98 oder 105) des festen Kontakts (96 oder 103 oder 121) bezüglich des beweglichen Kontakts (97 oder 104 oder 122) dient.
10. Schalter nach einem der Ansprüche 1 bis 9, wobei der schwenkbare Schalthebel (42 oder 143) an seinen Seitenklappen (47-48 oder 151-152) mit seitlichen Schneiden (51-52 oder 154-155) versehen ist, dadurch gekennzeichnet, daß er in gegenüberliegenden Längswänden des Rahmens (4) seines Gehäuses (2) im wesentlichen trapezförmige Öffnungen (53) zur Aufnahme der seitlichen Schneiden (51-52 oder 154-155) dieses schwenkbaren Schalthebels (42 oder 143) aufweist, die als Schwenklager für die Schneiden (51-52 oder 154-155) dienen.
11. Schalter nach einem der Ansprüche 1 bis 10, der in seinem Gehäuse (2) eine isolierende Basis (64 oder 166) aufweist, an der die elektrischen Kontaktsätze montiert sind, dadurch gekennzeichnet, daß er für eine Montage dieser isolierenden Basis (64 oder 166) im Gehäuse (2) einerseits in den Seitenwänden der isolierenden Basis in Abständen angeordnete Befestigungsbuckel (16, 17) und andererseits in den Enden des Rahmens (4) des Gehäuses (2) in Abständen angeordnete Einschnitte (11, 12) zur Aufnahme der Befestigungsbuckel (16, 17) der isolierenden Basis und Nasen (14, 15) aufweist, die nach Biegen die Blockierung dieser Buckel (16, 17) in diesen Einschnitten (11,-12) ermöglichen.
12. Schalter nach einem der Ansprüche 1 bis 11, wobei der schenkbare Schalthebel (42 oder 143) eine Rückholfeder (44) aufweist, deren Spannung durch eine Einstellschraube (45) regelbar ist, dadurch gekennzeichnet, daß er in seiner mechanischen Schalteinrichtung zur Montage des einen der Enden dieser Rückholfeder (44) des Schalthebels (42 oder 143), das in Form eines Ringes oder geschlossenen Hakens ausgebildet ist, einen Einschnitt (58 oder 158) aufweist, der in einen Flügel (54 oder 156) dieses Hebels (42 oder 143) eingeschnitten ist und mit der Wand des Schaltfingers (43) dieses Hebels (42 oder 143) einen Einlaß bildet, der etwas enger ist als der Durchmesser des die Rückstellfeder (44) bildenden Drahts.
13. Schalter nach Anspruch 6, dadurch gekennzeichnet, daß er als Halter für die Achse der Einstellkurvenscheibe (141), die durch die Klauen (149) in einem Abstand von der Vorderplatte (142) des Gehäuses des Schalters elastisch gehalten ist, eine an dieser Vorderplatte (142) befestigte Hülse (183) aufweist, in der die Achse drehbar ist.
EP19800400421 1979-04-06 1980-03-28 Temperaturabhängig betriebener elektrischer Schalter Expired EP0017572B2 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR7908791 1979-04-06
FR7908791A FR2453489B1 (fr) 1979-04-06 1979-04-06 Interrupteur electrique operant en fonction de la temperature
FR7927015A FR2468989A1 (fr) 1979-04-06 1979-10-31 Interrupteur electrique operant en fonction de la temperature
FR7927015 1979-10-31

Publications (3)

Publication Number Publication Date
EP0017572A1 EP0017572A1 (de) 1980-10-15
EP0017572B1 EP0017572B1 (de) 1983-05-11
EP0017572B2 true EP0017572B2 (de) 1989-10-11

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EP (1) EP0017572B2 (de)
DE (1) DE3060437D1 (de)
DK (1) DK157223C (de)
ES (1) ES490240A0 (de)
FR (1) FR2468989A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2490003A1 (fr) * 1980-09-05 1982-03-12 Thomson Brandt Interrupteur electrique thermostatique
IT240823Y1 (it) * 1996-07-30 2001-04-11 Firt S R L Termostato di controllo per apparecchiature a funzionamento,basatosu cicli termici

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2304019A (en) * 1941-04-29 1942-12-01 Ranco Inc Control apparatus
DE1069254B (de) * 1952-01-15 1959-11-19
DE1076231B (de) * 1956-12-14 1960-02-25 Kloeckner Moeller Elektrizit Temperaturwaechter
US2853583A (en) * 1957-01-09 1958-09-23 Westinghouse Electric Corp Controller
DE1243764B (de) * 1960-02-02 1967-07-06 Licentia Gmbh Thermostat, insbesondere fuer Kuehlschraenke
FR1593181A (de) * 1968-11-15 1970-05-25
DE2328887C3 (de) * 1972-07-24 1978-07-13 Veb Kombinat Mess- Und Regelungstechnik, Ddr 4500 Dessau Temperaturschalter
GB1558474A (en) * 1976-02-10 1980-01-03 Ranco Inc Temerature or pressure responsive switch units

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FR2468989B1 (de) 1983-01-21
DK157223B (da) 1989-11-20
EP0017572A1 (de) 1980-10-15
ES8101314A1 (es) 1980-12-01
FR2468989A1 (fr) 1981-05-08
ES490240A0 (es) 1980-12-01
DK145480A (da) 1980-10-07
DK157223C (da) 1990-04-23
EP0017572B1 (de) 1983-05-11
DE3060437D1 (en) 1982-07-08

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