JPH05114341A - Pressure switch - Google Patents

Abstract

PURPOSE: To provide a pressure switch in which high switching accuracy and stability for a long period can be guaranteed even when an environmental temperature is high, and the whole dimension can be lessened on the pressure switch and its manufacturing method. CONSTITUTION: A pressure switch 10 is provided with a switching means 26 which is arranged between housings 12, 14, and a pressure responsive element 24 which is arranged between two pressure rooms 20, 22 and acts on the switching means via an operating point 44. The switching means comprises at least one fixed contact element 30 and a moving contact element 32 provided on a contact spring 34. One end of the contact spring 34 is coupled with a snap spring 50, and the other end is supported by a plate spring 34 equipped with the operating point 44.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The invention relates to a pressure switch of the type mentioned in the preamble of claim 1 and also to a method of making such a switch.

[0002]

2. Description of the Prior Art Known pressure switches of the type described above are provided with commercially available microswitches, which are encapsulated as separate bodies, or with switching means arranged directly in the housing of the pressure switch. Microswitches are available with relatively small dimensions, but are not entirely suitable for very small actuation forces in the fine pressure regime. This is because a frictional force is generated when the operating force is transmitted to this type of switch. That is, a frictional force is generated there because the tappet is inserted into the housing, and a frictional force is also generated by the lever bearing of the operating lever. Moreover, in this type of switch, the adjustment of the response pressure is complicated and the switching pressure difference cannot normally be adjusted.

For example, as a fine pressure region, a gas heating boiler requires a switching accuracy of several Pascals for monitoring exhaust gas, and this switching accuracy cannot be guaranteed by a pressure switch having a known structure. Normally, if the working gas has a pressure below 2 mbar, or if the pressure difference is
Adjustment at less than 0.2 mbar becomes a problem. In known pressure switches in which the switching means are arranged directly in the housing, no additional transmission member is provided, which makes the pressure switch suitable for relatively small actuating forces. The switching means usually require a large space because they include a membrane element of relatively large diameter, and the deformation of the housing due to temperature changes because the contact parts are fixedly held on multiple housing parts of the plastic housing. There is a problem of becoming sensitive to.

Moreover, the known pressure switch housing usually includes a return spring structure, which results in a relatively high height. That is, for example, DE-PS 38 26 74
The pressure switch disclosed in 9 is provided with a compression spring as a return means, the bearing of which is clamped by means of a support against the clamp in the housing edge region of the membrane element which functions as a pressure-responsive element. Provided between the membrane element and the compression spring is a contact spring supporting the movable contact element, which contact spring is actuated by the membrane element via the tappet. The movable contact element and the fixed contact element are fixed at various points to the bottom of the plastic housing. Also, in known pressure switches of this kind, the housing is deformed due to temperature changes, so that the distance between the bearing of the compression spring and the movable contact element changes, which affects the switching accuracy. Is characterized by.

However, in addition to the method described at the beginning, there is a known pressure switch in which the switching means is arranged on the support. With such a configuration, it is possible to eliminate the temperature dependence if the support is made of metal, but the structure of such a pressure switch becomes complicated and it is difficult to mass produce it. The assembly work becomes very troublesome. Moreover, in such a construction, in particular, the support must be supported in at least two opposite positions in the edge region of the housing and, moreover, the switching means and the support of the pressure spring must also be supported.
Its configuration becomes more complicated.

Apart from the pressure switch of the above-mentioned specification with a plastic housing, pressure switches in metal capsules have also been known for a long time, but such pressure switches are not suitable for pressure switches with a plastic housing. It is extremely expensive in comparison.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a pressure switch which can ensure high switching accuracy and long-term stability even when the ambient temperature is high, and which can reduce the overall size. .. For example, if the membrane element working area is halved with respect to the conventional pressure switch,
Switching accuracy and contact properties can be improved. In this case, it is necessary not only to give a large response sensitivity to the pressure responsive element (usually a membrane element) capable of responding to the pressure but also to stabilize its shape even when the environmental temperature is high. Moreover, the subject of this invention is providing the pressure switch which can achieve a simple mounting while minimizing the number of parts.

[0008]

According to the invention, the first mentioned problem is solved by the characterizing part of claim 1. In the present invention, the operating point of the pressure responsive element, for example the membrane element, is located on the contact spring and the leaf spring with a large lever arm length as the switching contact of the movable contact element, so that the stroke of the membrane element is the stroke of the movable contact element. Will be larger than. As a result, the contact pressure can be amplified when the actuating force is transmitted to the contacts by the stroke of the membrane element, thus ensuring a reliable electrical switching.

With such a contact arrangement, the assembly length of the switching means is made shorter than in the known case, thus reducing the diameter of the housing of the pressure switch. Moreover,
The reduced housing size saves material and provides favorable assembly characteristics. In particular, this type of pressure switch is very suitable for a gas heating boiler monitoring mechanism.

In a preferred embodiment as claimed in claim 2, it is possible to dispense with the normally required compression or coil springs, in particular the height of the known pressure switch depends on such coil springs. This not only simplifies the structure of the pressure switch, but also significantly improves the switching accuracy. Furthermore, since it is not necessary to provide a tower-shaped structure for accommodating the compression spring on the outside of the housing, its assembly height is high. It can be significantly reduced.

A preferred embodiment as claimed in claim 3 is directed to adjusting the pressure adjusting value, which adjusting element replaces the conventional adjusting element which further increases the height of the structure described above. In an embodiment as claimed in claim 4,
Since the first adjusting element is provided in the sandwiching portion of the leaf spring, its installation position is in the vicinity of the switching means, so that a compact structure is obtained. The holding position of the leaf spring end is made adjustable by the first adjusting element, so that the pressure value is adjusted. Also, in the embodiment as claimed in claim 4, since the switching means are normally arranged in the housing of the pressure switch, it is possible to dispense with a guide from the housing for guiding the adjusting element to the outside. Therefore, the support portion on the side of the second housing is unnecessary, and thus the housing of the pressure switch can be easily sealed from the outside. If it is desired to make an external adjustment when the housing is closed, then an easily closable adjustment opening need only be provided.

According to an embodiment as claimed in claim 5, the contact spring is arranged centrally between the two spring parts of the leaf spring, so that the switching contact is exposed to the operating point of the pressure-responsive element. Become. Also, in this embodiment, the two spring parts are arranged symmetrically with respect to the contact spring, so that the contact spring and the leaf spring can be sandwiched substantially in one plane. According to the embodiment as claimed in claim 6, the leaf spring can be made of a relatively thin elastic material, and a rigid state can be guaranteed at least partially when loaded.

According to claim 7, all spring elements are free from longitudinal bending, so that not only the manufacture is simple, but also high precision is guaranteed. I mean,
This is because bending of the elastic material generally adversely affects accuracy. It should be noted that the bending caused when the snap spring is clamped is not the bending associated with manufacturing, but occurs only when assembled. According to claim 8, the second adjusting element is used for adjusting the switching pressure difference, in which case also the adjusting element is directly supported by the switching means.

According to a particularly preferred embodiment of the ninth aspect, the precision of the switching means is not affected by the deformation of the housing of the pressure switch. I mean,
This is because the switching means and the adjusting element as a whole are mounted on the switch carrier and are not fixedly held at a plurality of points with respect to the housing. The pressure switch made of a plastic material may be deformed by the influence of temperature, for example. In addition, both adjusting elements can each be directly metallically connected to the corresponding contact element. Actuating forces are not transmitted to the switch carrier, since they can be united, for example with rivets. It should be noted that the switch support is adapted to couple the switching means to the housing to a minimum extent.

Claim 10 describes a preferred embodiment of the switch carrier integrated in the housing. That is to say, for example, the housing part and the switch carrier can be formed in one working step in order to reduce costs, and yet the above-mentioned minimum coupling can be guaranteed. The embodiment as claimed in claim 11 is likewise directed to coupling the switching means to the housing to a minimum extent, like the embodiment as claimed in claim 8. This is because, unlike wires and rails, wires are usually flexible.

The embodiment described in claim 12 is preferable for reasonably connecting the pressure switch at both the mounting position and the test. In the embodiment as claimed in claim 13, the contact element is not directly exposed to the medium flowing into or out of the pressure chamber, and is thus protected from foreign matter such as dust carried in by the medium. Claim 14 and Claim 1
In addition to the preferred embodiments described above, an independent invention is also described and protection is claimed for this invention as well. In the case where the membrane element is spread over the entire surface, there is a possibility that a measurement error may occur because a slight shape stability is still obtained especially at the initial stage of pressure supply. In addition, although it is different when it is sandwiched between two supporting portions, it has a very complicated structure in that case. When the membrane element is fixed with only one membrane element supporting plate, bidirectional pressure response is possible, and at this time, the membrane element is not separated from the membrane element supporting plate. When the ring-shaped membrane element is used, it is possible to save the material, which is considerably higher in cost than the case where the membrane element is formed over the entire surface. Also, the reduced area and material savings reduce outgassing, which can compromise the electrical conductivity of the electrical contacts. With such a configuration, it is possible to detect the pressure very accurately even when the pressure is very small near the zero point. It was found that the ring-shaped membrane element was less troublesome in manufacturing than the case where the membrane element was formed over the entire surface. When the membrane elements are to be formed over the entire surface, they must be flattened and placed on the transfer device one by one, but the ring-shaped membrane element can be handled like bulk.

According to the fifteenth aspect, the problem of providing a stably shaped membrane element having extremely thin ridges, for example roll-shaped ridges, in order to obtain flexibility even when heat is generated significantly, is solved. Membrane elements of this kind have very good elastic properties over a wide temperature range, have good reproducibility and respond to minute pressure changes even with small hysteresis. According to the embodiment as claimed in claim 16, the response sensitivity of the membrane element is further improved, so that the actuation force particularly required for actuation can be reduced. This is because the membrane elements generally undergo bending rather than twisting. Therefore, a pressure switch with it can be used to detect very small pressures near the zero point. A suitable U-shaped or trapezoidal cross section is given to the membrane element during manufacture.
If the pressure rises during operation, the shape will transition to a balloon-like circle.

[0018] Claim 17 describes a preferable material capable of satisfying the above conditions as a material for forming the membrane element. The embodiment described in claim 18 is an alternative to the conventional angle fixing system. According to the invention, the ring-shaped mounting element, which preferably consists of wires, can be manufactured very inexpensively and requires little material, and it is also possible to pivot and adjust the pressure switch to the desired position. Furthermore,
According to this type of mounting method, since elastic holding is possible, the pressure switch can be protected from rigid vibration. According to the manufacturing method of the present invention as defined in claim 19, the pressure switch can be manufactured particularly reasonably. This is because not all of the component elements for the contact element have to be supplied individually.

[0019]

Embodiments of the pressure switch according to the present invention will now be described with reference to the accompanying drawings. The pressure switch 10 shown in FIG. 1 comprises an upper housing part 12 and a lower housing part 14, both of which housing parts 12 and 14 have pressure connections 16 and 1, respectively.
8 are provided between which a pressure differential is applied during operation. One of the pressure connections is open to atmospheric pressure, which allows the pressure switch to respond to a pressurized or depressurized condition. The pressure chambers 20 and 22 in communication with the pressure connections 16 and 18, respectively, are separated from each other by a pressure-responsive membrane element 24. Lower pressure chamber 22
A switching means 26 is provided therein, which switching means 26 is in the form of a unit 25 (FIG. 2) a switch support 28.
(FIGS. 1 and 2). The switch carrier 28 is provided with a first fixed contact element 30, a second fixed contact element 31 and a movable contact element 32.
2 is supported by a leaf spring 34 formed as a contact spring. Also, the switch carrier 28 has three adjusting elements, namely a first adjusting element 36 and a second adjusting element 38.
And a third adjusting element 40 is also provided. The first adjusting element 36 is used for adjusting the force required for operation, that is, for adjusting the switching point, and the second adjusting element 38 is used for adjusting the switching pressure difference between the operation (on) time and the shutoff (off) time. Be done. Further, the third adjusting element 40 is used for adjusting the stopper 42 for stopping the operating point 44, and the membrane element 24 acts on the operating point 44 via the tappet 46.

The operating point 44 is arranged on an elastic tongue 48 formed integrally with the leaf spring 34, which acts as an overload safety means when the displacement of the membrane element 24 is particularly great, The stopper 42 described above is used to limit the displacement of the tongue 48. The snap spring 50 is the leaf spring 34.
And one end of the snap spring 50, namely the leaf spring 3
The end farther from 4 is formed as a bending link portion 52, and is fixed to a holder 56 provided on an arm 54 of the switch support 28. The bending link portion 58 on the other end side of the snap spring 50 is fixed to the leaf spring 34. The leaf spring 34 supporting the movable contact element 32 and the first fixed contact element 30.
A spring arm 60 for supporting the second fixed contact element 31
It is fixed to the switch support body 28 by a sandwiching portion 62 that is common to the arm 64 that supports the. When only a single contact is required instead of both fixed contact elements, that is, the switching contacts 30 and 31, the arm 64 itself is provided without the fixed contact element 31 as a stopper or limiting means for the movable contact element 32. Can be used as

The end portion 6 of the leaf spring 34 opposite to the holding portion 62.
The movement stroke of 6 is limited by a T-shaped stopper 68 provided on the switch support 28. As is apparent from FIG. 2 (a top view of the switching means formed in the form of a unit 25), the snap spring 50 is arranged symmetrically with respect to the leaf spring 34 and divided into two split spring parts 50a. And 50b, both ends of which are fixed in portions 54a and 54b of the holder 54, respectively. The entire unit 25, including the switch support 28, is secured to the base 74 within the lower housing portion 14 by bolts 76. If the housing is deformed by the influence of temperature, the relative positions of the contact elements 30, 31 and 32 are not influenced by one another, so that the switching accuracy can be maintained independently of the deformation of both housing parts 12 and 14.

Regarding the operating point of the membrane element 24, the leaf spring 3
It is provided at a position with a lever arm length that is longer than the contact point of the movable contact element 32 with respect to 4, so that the force due to the stroke of the membrane element 24 can be transmitted to this contact point. The pressure switch 10 'shown in FIG. 3 comprises an upper housing part 12' and a lower housing part 14 ', both of which housing parts 12' and 14 'are provided with pressure connections 16' and 18 ', respectively. The pressure chambers 20 'and 22', which are in communication with the pressure connections 16 'and 18', are separated from each other by a membrane element support plate 23 and a pressure-responsive ring-shaped membrane element 24 '. The membrane element 24 ′ is provided with a raised portion 24 ″, and the membrane element supporting board 23
Locked in a radial groove 23 'formed in the outer peripheral edge of the. For such locking, the inner edge of the membrane element 24 'is made into a thick portion (not shown), and this thick portion is fitted into the facing concave portion of the membrane element supporting board 23, and has a diameter for locking. The directional groove 23 'is widened beyond the edge of the membrane element 24'.

The lower pressure connection 18 'has a vertical passage 18 ".
Is communicated with the lower pressure chamber 22 'via a pressure chamber 27', which is adjacent to the switch chamber 27 and separated from the switch chamber 27 by a partition wall 27 '. An opening 27 ″ for balancing pressure is provided between the lower pressure chamber 22 ″ and the switch chamber 27 ′, and the opening 27 ″ is separated from the tappet protrusion 46 ′ protruding from the membrane element supporting board 23. It is formed as an annular gap between the central opening of the wall 27 '. By providing the partition wall 27',
It is possible to prevent the switching means 26 ′ arranged in the switch chamber 27 from being exposed to a fluid that may bring in foreign matter such as dust. Also, the pressure balancing opening 27 "
The pressure difference between the switch chamber 27 sealed to the outside and the lower pressure chamber 22 'is prevented from being generated, and the tappet protrusion 46' can perform a stroke motion without friction.

The switching means 26 ', together with all of its components, are mounted on a switch support or stepped base 74' located within the lower housing portion 14 '. The stepped base 74 'is preferably integrally formed with the lower housing portion 14' and is provided with a plurality of fixed support planes. The switching means 26 ′ comprises a first fixed contact element 30 ′, a second fixed contact element 31 ′ and a movable contact element 32 ′, which movable contact element 32 ′ is supported by a contact spring 33. The leaf spring 35 is arranged in substantially the same plane as the contact spring 33, and like the contact spring, the stepped base 7 is provided.
It is sandwiched between 4 '. The free end of the leaf spring 35 and the contact spring 33
A snap spring 51 is stretched between its free end.

Membrane element support board 2 combined with membrane element 24 '
3 acts on the operating point 44 'of the leaf spring 35 via the tappet projection 46'. When the pressure in the upper pressure chamber 20 'rises and the membrane element 24' and the membrane element supporting plate 23 receive the rising pressure and are moved downward, the leaf spring 35 is pressed and the snap spring 51 is displaced. The contact spring 33 is then pushed upwards, which causes the movable contact element 32 ′ to be deactivated, ie the first fixed contact element 3
Open 0 ', working contact or second fixed contact element 3
1'is closed.

Two adjusting elements 36 'and 38' adjust the adjusting value and the switching pressure difference. The first adjusting element 36 ′ is in the form of an adjusting screw, which like the switching contact is also supported by the switch carrier 74 ′ via the connecting plate 37. The first adjustment element 36 'is used to adjust the biasing force of the leaf spring 35 provided opposite the tappet protrusion 46'. The first adjusting element or adjusting screw 36 'is arranged adjacent to the clamping part 63 of the leaf spring 35 and acts on the clamping point of the leaf spring 35 with the yoke support 39 with the bending link 39', thus The response value of the pressure switch will be adjusted. The second adjusting element 38 'is also in the form of an adjusting screw, so that the switch carrier 7
Supported by 4 '. This second adjusting element 38 'is used to adjust the distance between the two fixed contact elements 30' and 31 ', so that the switching pressure difference for actuating (on) and shutting off (off) can be adjusted. become.

An adjusting screw 36 'arranged in the switching chamber 27
And 38 'may be accessible through a closable opening formed in the bottom 15 or may project from the opening. In the embodiment shown, the space 15 'provided below the bottom 15 is closed by a cover 15 ", which prevents pressure loss in the switching chamber 27 or pressure chamber 22'. Switch support or step The base 74 'is provided with three mounting surfaces against which the switching contacts 30', 31 'and 32', the leaf spring 35 and the adjusting screws 36 'and 3'.
And 8'are fixedly supported. That is, the fixed contact element 3
1'is arranged on a contact support 29 which is fixedly supported on the upper mounting surface 75 of the switch support 74 '. Center mounting surface 7
The contact spring 33 and the leaf spring 35 are attached to the holding portion 63 on the 5 '.
And the support or splice 37 for the first adjusting screw 36 '.
Is pinched. A contact carrier 29 'carrying a fixed contact element 30' and a second adjusting bolt 38 'is fixedly supported on the lower mounting surface (not visible in FIG. 3). Since all contact elements and adjustment elements are fixedly supported on a common switch support 74 ', the housing part 1
Even if 2'and 14 'are deformed due to temperature changes, such deformation can be blocked from the switching means 26'.

As is apparent from FIG. 4, the leaf spring 35 is divided into two spring parts 35a and 35b symmetrically arranged on both sides of the contact spring 33. Also, the leaf spring 35 is longitudinally reinforced by the bent edges 35 'on both sides thereof, so that flexure is allowed only in both spring parts 35a and 35b. Plug-in contacts 78, 79 and 80 extend as external contacts through the bottom 15 of the lower housing part 14 ′, the inside of these plug-in contacts being via flexible wire connections 81, 82, 83 switching contacts 30 ′,
It is connected to 31 'and 32'. With such a flexible wire connection, even if the housing part is deformed, it is not exerted on the switching means. The plug contacts 78, 79 and 80 are integrated with the plug device of the device. FIG. 5A shows a method of fixing the ring-shaped membrane element 24 ′ to the membrane element supporting board 23. The membrane element support 23 is injection molded integrally with the membrane element 24 ', the membrane element being provided with ridges of circular cross section.

FIG. 5B shows a ring-shaped membrane element with ridges of U-shaped cross section in place. The raised portion is the flat portion 2
4a and a vertical or inclined side surface 24b, the open length of which corresponds at least approximately to the normally required circular ridge. The U-shaped cross section of the raised portion includes a trapezoidal cross section. A peripheral groove 84 is formed on the outer circumference of the housing portions 12 'and 14' of the pressure switch 10 ', and the ring-shaped mounting element 85 shown in FIG. Can be fixedly held. The ring-shaped attachment element preferably consists of a wire, on both ends of which threaded loops 86 are attached. With such a configuration, the pressure switch 10 'is fixedly held by the device (not shown) to be monitored.

FIG. 7 illustrates a stamped strip plate 87, in which the pressure switch, in particular the component 88 of the switching means 26 ', has been punched out, but is still integrally connected to the strip plate 87. Has become. During manufacturing, such strips are supplied to the pressure switch assembly station in place of the individual component elements, which facilitates automated assembly of the pressure switch. This is because the supplied components 88 remain precisely positioned. The component 88 is separated from the stamped strip 87 at the assembly station. It is also possible to preliminarily mount other component parts to each component part of the stamped band-shaped plate material 87. For example, the contact carrier can be fitted with contact elements such as contact rivets. According to the method described above, the manufacturing cost of the pressure switch can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a pressure switch according to the present invention having an integrated built-in switching means.

FIG. 2 is a plan view of the switching means shown in FIG.

3 is a longitudinal section taken along the line III-III of FIG. 4, showing a second embodiment of the pressure switch according to the invention with integrated built-in switching means.

4 is a cross-sectional view taken along the line IV-IV in FIG.

5A is a cross-sectional view showing a membrane element support board obtained by injection molding together with a ring-shaped membrane element having a ridge having a circular cross section, and FIG. 5B is a cross-sectional view similar to FIG. 5A,
FIG. 7 shows a ring-shaped membrane element with a ridge of U-shaped cross section.

6 is a perspective view showing a ring-shaped mounting element for fixing and holding the pressure switch shown in FIGS. 3 and 4. FIG.

FIG. 7 is a plan view showing a stamped band-shaped plate material when the component parts of the pressure switch are stamped.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Pressure switch 12 ... Upper housing part 14 ... Lower housing part 16 ... Pressure connection part 18 ... Pressure connection part 20 ... Pressure chamber 22 ... Pressure chamber 24 ... Membrane element 26 ... Switching means 28 ... Switch support 30 ... First Fixed contact element 31 ... Second fixed contact element 32 ... Movable contact element 34 ... Leaf spring 36 ... Adjusting element 38 ... Adjusting element 40 ... Adjusting element 44 ... Operating point 46 ... Tappet 62 ... Clamping portion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Oliver Peter Honetsger 8-8, Bieren-Ross, Zweher, Switzerland 43

Claims (19)

[Claims] 1. Housing (12, 14; 12 ', 1)
4 ') a switching means (26, 26') arranged within it and two pressure chambers (20, 22; 2) so as to be responsive to pressure.
0 ', 22') and a pressure responsive element (24; 24 ') arranged to act on said switching means via operating points (44, 44'), said switching means Have at least one fixed contact element (30; 30 ') and a movable contact element (3) provided on the contact springs (34, 33).
2; 32 ') and the contact spring (34; 33)
One end of which is connected to a snap spring (50; 51) and the other end of which has said operating point (44; 44 ').
4; 35), the contact element (30, 32; 3) forming a switching contact in a pressure switch
0 ', 32') is the tightening portion (62; 63) of the contact spring (34; 33) on the housing side and the operating point (44;
44 ') and is arranged between said leaf springs (34; 35)
Is clamped on the same side as the contact springs (34; 33). 2. The pressure switch according to claim 1, further comprising a return member for providing a reaction force or an urging force to the pressure responsive element (24; 24 ′), the return member being the leaf spring (34). 35) which is formed by the pressure switch. 3. Pressure switch according to claim 2, characterized in that the biasing force of the leaf springs (34; 35) is adjustable by means of a first adjusting element (36; 36 '). .. 4. The pressure switch according to claim 3, wherein the first adjusting element (36 ′) is the leaf spring (3).
5) A yoke support (39) arranged adjacent to the holding part (63) and having a bending link (39 ') at the holding part.
A pressure switch, characterized in that it acts on the leaf spring (35) provided with. 5. The pressure switch according to claim 1, wherein the leaf springs (35) are arranged symmetrically with respect to the contact spring (33) on both sides thereof. A pressure switch, characterized in that it comprises three spring parts (35a, 35b). 6. The pressure switch according to claim 5, wherein the leaf spring (35) has bent edges (3) on both sides thereof.
5 ') is longitudinally reinforced by means of which
A pressure switch characterized in that only two spring parts (35a, 35b) are allowed to flex. 7. The pressure switch according to claim 1, wherein the leaf spring (35), the contact spring (33) and the snap spring (51) are provided at the time of manufacture. A pressure switch characterized in that bending in the bending or longitudinal direction is eliminated. 8. The pressure switch according to claim 1, wherein the fixed contact element (3
0 ') is engaged with a second adjusting element in the form of an adjusting screw (38') to adjust the switching pressure difference by changing the contact distance, said adjusting screw (3
Pressure switch 8 ') adapted to support or form said fixed contact element (30'). 9. The pressure switch according to claim 1, wherein the contact elements (30 ′, 3).
1 ', 32'), the adjusting element (36 ', 38') and the leaf spring (35) are connected to the housing (12 ', 1').
A pressure switch characterized in that it is mounted on a switch support (74 ') associated with 4'). 10. Pressure switch according to claim 9, characterized in that the switch support (74 ') is a base integrally formed with two housing parts (12', 14 '). And pressure switch. 11. The pressure switch according to claim 1, wherein the housing (1
2 ', 14), an electrical external terminal (7
8, 79, 80) are connected to the contact elements (30 ', 31', 32 ') by flexible wires (81, 82, 83) provided in the housing (12', 14 '). A pressure switch characterized in that. 12. Pressure switch according to claim 11, characterized in that the external terminals (78, 79, 80) are formed as plug means of the device. 13. The pressure switch according to claim 1, wherein the contact element (3
0 ', 31', 32 ') are the pressure chambers (20', 2 '
2 ') located in a switching chamber (27) which is separate from the outside and closed to the outside, which switching chamber is in communication with an adjacent pressure chamber (22') via a pressure balancing opening (27 "). A pressure switch characterized in that. 14. A pressure switch according to claim 1, wherein the pressure responsive element comprises a ring-shaped membrane element (24 ′), the membrane element being adjacent to the operating point (44 ′). Pressure, characterized in that it is fixed in the radial groove (23 ') of 23) or the membrane element support disc (23) is injection molded integrally with the membrane element (24'). switch. 15. A pressure switch according to claim 14, wherein said membrane element (24 ') is made of a plastic material having shape-stable properties over a large temperature range and has a very thin ridge (24 "). A pressure switch comprising: 16. A pressure switch according to claim 14 or 15, wherein said raised portion (24 ″) is flat and has a vertical side surface or an inclined side surface (24) when the biasing force is released.
b) A pressure switch having a U-shaped cross-section consisting of b) and whose expanded length approximately corresponds to the length of a circular ridge normally required. 17. The method according to any one of claims 14 to 16.
A pressure switch according to paragraph (1), wherein the membrane element (2
A pressure switch characterized in that 4 ') is formed from a two-component liquid silicon material. 18. The pressure switch according to claim 1, wherein a peripheral groove (84) is formed on the outside of the housing (12 ', 14'), the peripheral groove for the device whose pressure switch is to be monitored. A pressure switch, characterized in that it is used for fixedly holding with a ring-shaped mounting element (85) in an arbitrary position rotatably around the axis of the pressure switch. 19. A method for manufacturing a pressure switch according to claim 1, wherein the leaf spring (35), the contact spring (33) and / or the contact carrier (29, 29 ') is formed in the stamped strip (87) and additional component elements, in particular contact strips (30', 31 ', 3) to the stamped strip (87).
2 ') is mounted in advance, and then the punched strip-shaped plate is pressed with a pressure switch (with the leaf spring (35), the contact spring (33) and / or the contact support being connected to the punched strip-shaped plate. A pressure switch characterized in that it is supplied to the assembly station of 10 ').