US3233056A - Adjustable condition-responsive plunger-operated snap-action electrical switch - Google Patents

Adjustable condition-responsive plunger-operated snap-action electrical switch Download PDF

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Publication number
US3233056A
US3233056A US298535A US29853563A US3233056A US 3233056 A US3233056 A US 3233056A US 298535 A US298535 A US 298535A US 29853563 A US29853563 A US 29853563A US 3233056 A US3233056 A US 3233056A
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United States
Prior art keywords
housing
contact springs
tongue
snap
spring
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Expired - Lifetime
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US298535A
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English (en)
Inventor
Beck Walter
Roll Karl
Enssle Peter
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WALTER BECK K G KONTROLL und F
Walter Beck Kg Kontroll- und Fernmessgerate
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WALTER BECK K G KONTROLL und F
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/087—Water level measuring or regulating devices
    • 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
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
    • H01H5/04—Energy stored by deformation of elastic members
    • H01H5/06—Energy stored by deformation of elastic members by compression or extension of coil springs

Definitions

  • the present invention relates to a multipole snap-action electrical switch especially adapted for use in connection with the operation of a washing machine, and. it is an object of the invention to provide such a snap switch which is equipped with a number of contact springs in accordance with the number of poles and projecting between pairs of contacts, and in which these contact springs are operated by tonguelike strips, hereafter called tongues, which are acted upon by snap springs and control springs and are controlled by an actuating element which may be operated from the outside.
  • tongues tonguelike strips
  • the present invention provides a control member between the actauting element, which may be operated from the exterior, and the contact springs.
  • this intermediate control member it is possible to transmit the pressure which is exerted by the actuating element to the contact springs in the manner as may be desired in the particular snap switch.
  • the intermediate control memher is preferably provided in the form of a rocker which is mounted between the two contact springs which are associated with the pairs of poles, and which is acted upon by the central actuating element through an intermediate tongue and a snap spring which is associated with this tongue.
  • the rocker and/or the snap spring are preferably mounted on knife edges or points.
  • a firm engagement of the contact springs with the off contacts of the switch may also be attained if the bearing point of the snap spring in the rocker is spaced from the common pivot axis of the two contact springs at a distance which is equal to or greater than the distance of the bearing points of the rocker on the two contact springs from the same pivot axis.
  • the critical position is then that position in which the bearing point of the snap spring in the rocker and the two bearing points of the rocker on the contact springs lie substantially in a common straight line which extends perpendicularly to the direction of the pivoting movement of the contact springs.
  • the rocker is mounted so as to be very easily movable and can therefore rapidly follow the snapping movement which is produced by the snap spring.
  • the intermediate control member is provided 3,233,056 Patented Feb. 1, 1966 in the form of a crossarm or the like between the two contact springs.
  • This crossarm is rigidly secured to the free end of a single tongue which is controlled by the mentioned actuating element and, in turn, controls the two contact springs through snap springs which are interposed between the ends of the crossarm and the contact springs.
  • the tongue again effects a practically simultaneous switchIng operation of both contact springs since after the first snap spring has snapped over and the direction of force is therefore reversed, this will assist in the pivoting movement of the tongue with the result that immediately thereafter also the second snap spring will snap over and thereby compel the second contact spring to carry out its switching operation.
  • the tongue is preferably pivotably mounted at one end so as to be freely pivotable about an axis which extends perpendicularly to the planes of the pivoting movement of the contact springs so that the tongue will be very easily movable.
  • Each of the two ends of the crossarm which is secured to the other end of the tongue is then designed so as to support one end of one of the two snap springs, while the other end thereof is supported on one of the two contact springs.
  • this switch with a resilient member between the tongue and the outer actuating element, for example, in the form of a compression coil spring.
  • This compression spring is preferably mounted so that its axis forms a continuation of the axis of the control spring.
  • the intermediate control member of the snap switch is provided in the form of a T-shaped or cross-shaped memher which is disposed between the two contact springs and is adapted to control them by means of a pair of tongues and a pair of snap springs each of which is interposed between one of the tongues and the associated contact spring.
  • the bearing of this control member is preferably designed, for example, in the form of a point-suspension bearing or a ball socket, so as to permit the control member to be freely movable in four directions so that it may not only pivot back and forth about its pivot point but may also tilt back and forth about its central axis.
  • the switch according to this third embodiment of the invention per units, when a constant force is exerted by the outer actuating element upon the control member, that at first only one snap spring will be snapped over and the associated contact spring will thereby be switched over and that the snapping of the other snap spring and the switching of the other contact spring will not occur until the first contact spring has been switched over.
  • the switching times may be further varied by adjusting the position of the pivot bearing of the control member and thus the position of the latter when in its inactive state.
  • a stop member which is preferably also adjustable. The stop is then preferably applied on the second tongue which is swung over after the first tongue has been completely pivoted and its associated contact spring has been switched over.
  • control member which acts upon the tongues of the two contact springs is pivotably suspended at its free end on a fixed point of the housing and is then pivoted, the point of engagement of the central actuating element on the control member and also the points of engagement of the latter on the tongues of the contact springs will be horizontally displaced in accordance with the size of the pivoting angle. Such a horizontal displacement of these two points is, however, very undesirable since it may infiuence the different forces which are acting upon the control member.
  • the invention further provides according to a fourth embodiment that the free end of the control member may be pivotably suspended on a pivot pin or the like which, in turn, is pivotably suspended on a stationary part.
  • the control member together with the pivot pin then form a lever system in which the free end of the pivotable pin on which the control member is pivotably suspended can yield to the same an extent by which the horizontal projection of the control member is shortened as the result of its pivoting movement.
  • This means that the point on the control member on which the central actuating element engages can follow its vertical direction of movement and move likewise in this vertical direction. Consequently, the two other points on the control member which act upon the contact springs will also carry out a vertical movement.
  • the free end of the pivot pin is preferably made in the form of a crowned head which serves as a support for the end of the control member.
  • the pivoted end of the control member may also be provided with a longitudinal slot of a width greater than the diameter of the stem of the pivot pin. The two arms on the end of the control member which are formed by this slot then rest on the crowned head of the pivot pin at both sides of its stem.
  • the upper end After the snap spring which is associated with of the pin should also be provided with a crowned head.
  • the stem of the pin directly underneath this head then extends through a bore in the housing which is enlarged on its outer side to form a ball socket for the crowned head.
  • the diameter of the latter directly underneath the crowned head is preferably made considerably smaller than the diameter of the bore. The pivot pin may then pivot easily about a considerable angle toward all sides.
  • FIGURE 1 shows a diagrammatic illustration of the principles of operation of a snap switch according to the invention
  • FIGURE 2 shows a cross section which is taken along line 22 of FIGURE 3 of a two-pole switch with contact tongues which may be switched simultaneously;
  • FIGURE 3 shows a cross section which is taken along line 3-3 of FIGURE 2;
  • FIGURE 4 shows a plan view of an intermediate control member in the form of a rocker
  • FIGURE 5 shows a cross section of the rocker according to FIGURE 4.
  • FIGURE 6 shows a cross section which is taken along line 6-6 of FIGURE 7 of a two-pole snap switch according to a modification of the invention
  • FIGURE 7 shows a cross section which is taken along line 77 of FIGURE 6;
  • FIGURE 8 shows a diagrammatic illustration of the mode of operation of the switch according to FIGURES 6 and 7;
  • FIGURE 9 shows a cross section which is taken along line 9-9 of FIGURE 6;
  • FIGURE 10 shows a cross section which is taken along line 1t I0 of FIGURE 11;
  • FIGURE 11 shows a cross section which is taken along line 1111 of FIGURE 10;
  • FIGURE 12 shows a cross section which is taken along line 1212 of FIGURE 10;
  • FIGURE 13 shows a cross section of a two-pole snap switch according to a further modification of the invention with successively operating contact springs
  • FIGURE 14 shows an enlarged detail view of a part of the switch according to FIGURE 13;
  • FIGURE 15 shows a cross section which is taken along line 1515 of FIGURE 14;
  • FIGURE 16 shows a bottom view of FIGURE 14 as seen in the direction of the arrow D therein;
  • FIGURE 17 shows a diagrammatic illustration of the lever system as employed in the embodiment according to FIGURES 13 to 16.
  • FIGURE 1 illustrates the principles of application of a switch according to the invention to a washing machine. It shows diagrammatically a tub I of a washing machine, the bottom 2 of which is connected by a U-shaped pipe 3 with a standpipe 4, the upper end of which is closed. The upper part of this standpipe 4 contains a diaphragm switch as indicated diagrammatically at 5.
  • tub 1 contains the amount of water as indicated at 6, the air cushion 8 between the column of water 7 and the diaphragm switch 5 will be compressed in accordance with the water level. If the water 6 rises in tub I to the level indicated by the line 9, the column of water 7 also rises to the level 9' which causes a further compression of the air cushion 8. This rise in pressure of the air cushion 8 then acts upon the diaphragm (not shown in FIG. 1 but seen at 15 at FIG. 2) of the diaphragm switch 5 and effects an operation thereof. If,
  • the level9 of the water 6 again drops in the tub I, the air cushion 8 again expands and, when it reaches the predetermined air pressure to which switch 5 is responsive, it causes the switch to reverse to its original position.
  • FIGURE 2 illustrates one preferred embodiment of the diaphragm switch 5 according to the invention. It comprises a closed inverted cup-shaped cylindrical housing 11 of insulating material which has a cover 12 on its lower end with a central air inlet 13. Between the edge 14 of housing and cover 12 a diaphragm 15 is clamped which is reinforced by a plate 16 of sheet metal and carries centrally on the latter a tappet 17.
  • housing 11 contains two pairs of contacts 18, 19 and 21, 22 between which the free ends of contact springs 23 and 24 with contact studs thereon are inserted, the spring being rigidly secured at their other ends in the wall of housing 11.
  • contact springs 23 and 24 engage under preliminary tension with the upper contacts 18 and 21.
  • Contact springs 23 and 24 are further provided with trapezoidal apertures 25 and 26 through which the two arms 27 of a rocker 28 interengage to form a bridge of insulating material between the two contact springs 23 and 24 and extends parallel to the horizontal swivel axis of these springs.
  • This rocker 28 is illustrated in detail in FIGURES 4 and 5. As shown particularly in FIGURE 5, the arms 27 of rocker 28 have angular notches 29 which insure an accurate knife-edge suspension of the edges of the apertures 25 and 26 of contact springs 23 and 24.
  • a spring strip 31 in the form of a tongue is rigidly secured at one end in the Wall of housing 11 and extends centrally between the two contact springs 23 and 24 and is acted upon at its upper side by a spring 32 which is mounted in a recess in housing 11. Tongue 31 is further acted upon by a snap spring 33 which engages at one end upon the tip 34 of tongue 31 and is held at the other end in a cylindrical recess 35 in rocker 28.
  • this recess 35 is made of such a depth that its bottom is in a straight alignment with the notches 29 along the line a, as shown in FIG- URE 5.
  • snap spring 33 When during this pivoting movement of tongue 31, the tongue is in alignment with snap spring 33 and both of them then extend in the same direction as the contact springs 23 and 24 (when the latter are in their inoperative or off positions), snap spring 33 has also reached its dead-center position, so that immediately thereafter in the pivoting movement of tongue 31 snap spring 33 (together with rocker 28 and the two contact springs 23 and 24) will snap over to the other side, i.e. the on position, as indicated in broken lines in FIGURE 2. In this on position the current flows no longer through the off contacts 18 and 21 but through the on contacts 19 and 22. The switching operation which is caused by the rise in air pressure in thus completed.
  • FIGURES 6 to 8 illustrate a similar construction of such a snap switch with two simultaneously moving contact springs.
  • the pivotable tongue 41 is not straight and clamped tightly at one end in the wall of housing 11, but it is T-shaped and its central arm is pivot-ably mounted at its free end so as to be pivotable about a horizontal axis 42 on the housing 11, while its crossarm 43 is bent so as to have offset portions intermediate its central part and its ends 53 and 54.
  • These ends are provided with tips 44 and 45, each of which serves as a support for a snap spring 46 or 47, respectively, On their other ends, snap springs 46 and 47 are mounted on counterpoints 48 and 49 on the contact springs 23 and 24.
  • contact springs 23 and 24 are provided with elongated slots 51 and 52 into which the free ends 53 and 54 of crossarm 43 project when the switch is in the on-position, as indicated in dotted lines in FIGURE 6.
  • this switch isfurther provided with a storing spring 55 which is mounted between tongue 41 and the tip of tappet 17. This storing spring 55 is mounted so that its axis is in alignment with the axis of the control spring 32.
  • the mode of operation of the switch according to FIGURES 6 to 8 is in principle the same as that of the switch according to FIGURES 2 to 5.
  • the addition of the storing spring 55 has the further advantage that this spring at first takes up and stores a part of the force which is exerted by the tappet 17 and then transmits this stored force to the pivotable tongue 41 at the moment when the two snap springs 46 and 47 snap over to the other side.
  • This additional force of the storing spring 55 insures a very quick movement of tongue 41 and snap springs 46 and 47 through the straight dead-center position which, in turn, means a very quick switching action of the two contact springs 23 and 24 even if the stroke of diaphragm 15 and tappet 17 is very slow.
  • FIGURES 10 and 12 illustrate a third embodiment of the snap switch according to the invention.
  • Those parts of this switch which are substantially equal to the corresponding parts of the two switches as previously described are again identified by the same reference numerals.
  • This switch diii ers in principle from those two switches by the fact that its two contact springs are not switched on or off simultaneously but successively. While these contact springs 23 and 24 are again provided with longitudinal slots 51 and 52 as in FIG- URE 7, each of these slots is associated with a separate pivotable tongue 61 or 62 which is clamped tightly at one end in the wall of housing 11 together with and centrally between the two webs of the respective contact spring 23 or 24. Each tongue 61 and 62 is acted upon by a separate control spring 63 or 64.
  • a T-shaped control member 65 is provided which is mounted at the free end of its central arm 66 on the spherical head 67 of a pin so as to be freely pivotable in all directions.
  • the crossarm 68 of the control member 65 is bent at both sides of the central arm 66 so as to be disposed within a lower pl-ane, As illustrated particularly in FIGURE 10, the other end of the central arm 66 projects beyond the crossarm 68 so that the point of engagement of the tappet on this projecting end is offset relative to the crossarm 68 and the lifting force which is exerted by the tappet will therefore be transmitted by the two tips '71 and 72 on the ends of crossarm 68 at a certain transmission ratio to the tongues 61 and 62.
  • the switching times may be changed not only by exchanging or adjusting the control springs 63 and 64, but also by providing suitable means for adjusting the bearing pin 67 and thus the pivot point of the control member 65 in the vertical direction.
  • Another possibility of varying the switching times consists in limiting the extent of the pivoting movement of one or both tongues 61 and 62 by providing a stop member 75 for the respective tongue as indicated particularly in FIGURE 10.
  • Such a limitation of the pivoting range of one or both tongues 61 and 62 not only determines the extent of the idle stroke of the control member 65, but it also prevents that the two spring systems will effect each other during this idle stroke.
  • FIGURE 13 finally shows a fourth design of the switch mechanism according to the invention, while FIGURES 14 to 16 show greatly enlarged detail views of some of the parts of this mechanism.
  • Those parts of this switch which are similar to the corresponding parts of the switches as previously described are again identified by the same reference numerals.
  • the control member 65 is pivotably mounted at the end 76 of its longitudinal arm 66 on the head 77 of a pin 78 which, in order to reduce the friction between this head 77 and the end 76 of the control member 65 as much as possible, is made of a crowned or spherical shape.
  • the upper edge 79 of this head 77 serves as a support of two arms 82 which surround the lower part 83 of the stem of pin 78 and are formed by a longitudinal slot 81 in the end of arm 66 of the control member.
  • the lower part of the two arms 82 is trough-shaped to receive the rounded head 77, and the width of slot 81 is made only slightly greater than the thickness of the lower part of stem 83.
  • pin 78 is, in turn, pivotally mounted in the bottom 84 of housing 1 1.
  • the bottom 84 is provided with a bore 85 of a size which is slightly larger than the diameter of the central part 86 of pin 78.
  • bore 85 is enlarged and this enlarged part is provided with a spherical surface 87 so as to form a ball socket in which the rounded head 38 is suspended so that pin 78 may freely pivot in any direction.
  • the upper part 89 of stem 83 between the central part 86 and the upper head 88 is made of a considerably smaller diameter than bore 85.
  • FIGURE 17 finally illustrates diagrammatically the motional conditions of the control member 65 and its suspension system according to FIGURE 13. If the control member 65 would be pivotably mounted, for example, at a fixed point A and would then be pivoted in the direction of the arrow 73 to the dotted-line position, the two points B and C moving along an are about the point A would be shifted horizontally by the distance a toward the left. If the point B corresponds to the point of engagement 69 of tappet 17 on control member 65 and point C corresponds to the points of engagement of the two tips 71 of the control member on tongues 61, this means that these points of engagement would be shifted accordingly.
  • the invention provides that the point A is not made a fixed pivot point but provided on the end of pin 78 which, in turn, is pivotally suspended. If the control member 65 is then pivoted in the direction 73, it will follow the vertical movement 36 of the tappet 17 since its pivoting movement is caused by the tappet. Control member 65 can carry out this movement in spite of the shortening in the horizontal projection since pin 7 8 can yield toward the right in the direction of the arrow 91 and can thereby compensate for the distance a, as indicated by the dotand-dash line in FIGURE 17. This, in turn, means that the two points B and C then move in the vertical direction 36 and are still located vertically above their original positions B and C when the control member 65 is pivoted to its highest position.
  • a multi-pole snap-action electrical switch comprising a housing; at least two pairs of spaced-apart contacts in said housing; a plurality of contact springs in said housing, each of said contact springs being secured at one end to said housing and swingable at said end while having contact points on the other end intermediate the contacts of a respective pair for alternately disengaging one of the contacts and engaging the other contact of the respective pair; at least one tongue member mounted at one end on said housing; actuating means within said housing operable from the exterior of said housing and connected with said tongue member for pivoting said tongue member in one direction about said end thereof; a control spring acting upon said tongue member in the opposite direction; at least one snap spring connected to said tongue member and at least to one of said contact springs for precipitously pivoting at least one of said contact springs from one of the contacts to the other contact of the respective pair when-said tongue member is swung slightly beyond a deadcenter position wherein said member is aligned with said snap spring; and a control member in said housing for transmitting movement of said actuating
  • a multi-pole snap-action electrical switch comprising a housing; at least two pairs of spaced-apart contacts in said housing; a plurality of contact springs in said housing, each of said contact springs being secured at one end to said housing and swingable at said end while having contact points on the other end intermediate the contacts of a respective pair for alternately disengaging one of the contacts and engaging the other contact of the respective pair; at least one tongue member mounted at one end on said housing; actuating means within said housing operable from the exterior of said housing and connected with said tongue member for pivoting said tongue member in one direction about said end thereof; a control spring acting upon said tongue member in the opposite direction; at least one snap spring connected to said tongue member and at least to one of said contact springs for precipitously pivoting at least one of said contact springs from one of the contacts to the other contact of the respective pair when said tongue member is swung slightly beyond a dead-center position wherein said member is aligned with said snap spring; and a control member in said housing for transmitting movement of said actuating means
  • a multi-pole snap-action electrical switch comprising a housing; at least two pairs of spaced-apart contacts in said housing; a plurality of contact springs in said housing, each of said contact springs being secured at one end to said housing and swingable at said end while having contact points on the other end intermediate the contacts of a respective pair for alternately disengaging one of the contacts and engaging the other contact of the respective pair; at least one tongue member mounted at one end on said housing; actuating means within said housing operable from the exterior of said housing and connected with said tongue member for pivoting said tongue member in one direction about said end thereof; a control spring acting upon said tongue member in the opposite direction; at least one snap spring connected to said tongue member and at least to one of said contact springs for precipitously pivoting at least one of said contact springs from one of the contacts to the other contact of the respective pair when said tongue member is swung slightly beyond a dead-center position wherein said member is aligned with said snap spring, a control member in said housing for transmitting movement of said actuating means to
  • a multi-pole snap-action electrical switch comprising a housing; at least two pairs of spaced-apart contacts in said housing; a plurality of contact springs in said housing, each of said contact springs being secured at one end to said housing and swingable at said end while having contact points on the other end intermediate the contacts of a respective pair for alternately disengaging one of the contacts and engaging the other contact of the respective pair; at least one tongue member mounted at one end on said housing; actuating means within said housing operable from the exterior of said housing and connected with said tongue member for pivoting said tongue member in one direction about said end thereof; a control spring acting upon said tongue member in the opposite direction; at least one snap spring connected to said tongue member and at least to one of said contact springs for precipitously pivoting at least one of said contact springs from one of the contacts to the other contact of the respective pair when said tongue member is swung slightly beyond a dead-center position wherein said member is aligned with said snap spring, a control member in said housing for transmitting movement of said actuating means to
  • a multi-pole snap-action electrical switch comprising a housing; at least two pairs of spaced-apart contacts in said housing; a plurality of contact springs in said housing, each of said contact springs being secured at one end to said housing and swingable at said end while having contact points on the other end intermediate the contacts of a respective pair for alternately disengaging one of the contacts and engaging the other contact of the respective pair; at least one tongue member mounted at one end on said housing; actuating means within said housing operable from the exterior of said housing and connected with said tongue member for pivoting said tongue member in one direction about said end thereof; a control spring acting upon said tongue member in the opposite direction; at least one snap spring connected to said tongue member and at least to one of said contact springs for precipitously pivoting at least one of said contact springs from one of the contacts to the other contact of the respective pair when said tongue member is swung slightly beyond a dead-center position wherein said member is aligned With said snap spring; and a control member in said housing for transmitting movement of said actuating means

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanisms For Operating Contacts (AREA)
  • Switches With Compound Operations (AREA)
  • Push-Button Switches (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
US298535A 1962-07-30 1963-07-26 Adjustable condition-responsive plunger-operated snap-action electrical switch Expired - Lifetime US3233056A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DEB50107U DE1899866U (de) 1962-07-30 1962-07-30 Mehrpoliger schnappschalter, insbesondere fuer waschmaschinen.
DEB0068232 1962-07-30
DEB70418A DE1289168B (de) 1962-07-30 1963-06-22 Druckabhaengiger zweipoliger elektrischer Schnappschalter

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US3233056A true US3233056A (en) 1966-02-01

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US298535A Expired - Lifetime US3233056A (en) 1962-07-30 1963-07-26 Adjustable condition-responsive plunger-operated snap-action electrical switch

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US (1) US3233056A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (3) DE1272421B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR1367841A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1044638A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL295877A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

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US3352983A (en) * 1965-06-29 1967-11-14 Controls Co Of America Pressure switch and electrical switch therefor
US4008453A (en) * 1974-03-27 1977-02-15 Grossag Gesellschaft Mit Beschrankter Haftung Thermal change-over switch

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Publication number Priority date Publication date Assignee Title
DE1665193B1 (de) * 1967-02-21 1971-08-12 Matsushita Electric Works Ltd Elektrischer Schnappschalter fuer Druckbetaetigung

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US2755353A (en) * 1953-08-07 1956-07-17 Soreng Products Corp Overcenter snap switch
US2939927A (en) * 1956-06-21 1960-06-07 Dole Valve Co Pressure switch
US2975251A (en) * 1958-02-20 1961-03-14 Controls Co Of America Pressure switch
DE1143894B (de) * 1958-11-28 1963-02-21 Walter Holzer Elektrischer Druckschalter fuer zwei verschiedene Ansprechdrucke

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FR956903A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) * 1950-02-10
US2104848A (en) * 1935-11-11 1938-01-11 Hoffman Gas & Electric Heater Electric switch
US2578340A (en) * 1948-05-06 1951-12-11 Miller Co Hot water heating system and control therefor
DE1046921B (de) * 1952-12-27 1958-12-18 Christian Buerkert Thermostatische Schalteinrichtung
US2758171A (en) * 1955-02-02 1956-08-07 Cherry Electrical Prod Multiple pole double-throw simultaneous-action snap-action switches
US2851559A (en) * 1957-03-27 1958-09-09 Westinghouse Electric Corp Thermostatic switch
DE1792656U (de) * 1958-11-24 1959-07-30 Busch Jaeger Duerener Metall Temperaturwaechter.

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Publication number Priority date Publication date Assignee Title
US2755353A (en) * 1953-08-07 1956-07-17 Soreng Products Corp Overcenter snap switch
US2939927A (en) * 1956-06-21 1960-06-07 Dole Valve Co Pressure switch
US2975251A (en) * 1958-02-20 1961-03-14 Controls Co Of America Pressure switch
DE1143894B (de) * 1958-11-28 1963-02-21 Walter Holzer Elektrischer Druckschalter fuer zwei verschiedene Ansprechdrucke

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3352983A (en) * 1965-06-29 1967-11-14 Controls Co Of America Pressure switch and electrical switch therefor
US4008453A (en) * 1974-03-27 1977-02-15 Grossag Gesellschaft Mit Beschrankter Haftung Thermal change-over switch

Also Published As

Publication number Publication date
DE1272421B (de) 1968-07-11
DE1289168B (de) 1969-02-13
NL295877A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR1367841A (fr) 1964-07-24
DE1899866U (de) 1964-09-03
GB1044638A (en) 1966-10-05

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