JPH0438439Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field
This product relates to terminal parts for pressure switches that operate at low pressure (H2O) and detect gas leaks and other conditions.

(b) Prior Art Conventionally, a pressure switch that expands and contracts a pressure receiving element in response to changes in fluid pressure and opens and closes between the contact portions of an action switch by advancing and retracting a plunger that is linked to this pressure receiving element has been used. For example, there is a switch having a structure as shown in FIG.

That is, in the figure, this pressure switch includes a cylindrical pressure receiving flange 20, a disk-shaped protective cap 24 having a pressure receiving port 23 attached to the upper end flange portion 22 of this pressure receiving flange 20, and a synthetic resin switch. A case 25, a ring-shaped metal holding plate 27 attached to an annular recess 26 in the vertically intermediate portion of the switch case 25, and a pressure receiving chamber 28 communicating with the pressure receiving port 23 described above, A pressure receiving element 29 that expands and contracts in response to changes in gas or other fluid pressure; A plunger 31 that moves forward and backward in conjunction with the pressure receiving element 29 and is disposed within the plunger sliding hole 30 of the switch case 25; A switch base 33 is engaged and fixed to the skirt portion 32 of the switch case 25, and an action switch 34 is assembled to the switch base 33 and opens and closes between the contact portions in conjunction with the forward and backward movements of the plunger 31 described above. We are prepared.

Furthermore, in the drawing of the switch base 33 mentioned above,
An input fixed terminal 35 is formed as an insert on the right side,
Further, in the drawing, an output fixed terminal 36 is formed as an insert on the left side.

Then, by extending the upper end of the input fixed terminal 35 into the switch internal space 37 and bending this extended upper end in the horizontal direction, a fixed piece 38 integrally formed with the input fixed terminal 35 is attached to the upper end of the input fixed terminal 35. is forming.

The above-mentioned fixing piece 38 has its free end connected to the plunger 3.
By forming an opening 39a in this extending portion, the extending end portion 40 is formed into a narrow portion 39 that is vertically movable.

On the other hand, the upper end of the aforementioned output fixed terminal 36 similarly extends into the switch internal space 37, and the fixed tongue piece 41 is integrally formed by bending this extended upper end in the horizontal direction.

Further, as shown in FIG. 6, there are provided an annular movable piece 42 made of a flat plate spring and an urging spring 43 made of a plate spring curved in an arch shape.

Then, the right inner end 42a of the above-mentioned movable piece 42
is locked in the approximately V-shaped notch in the right bent portion 45 of the above-mentioned fixed piece 38, and the right end fulcrum portion 44 of the biasing spring 43 corresponds to the left bent portion of the above-mentioned fixed piece 38. The extension end portion 40 is engaged with a substantially V-shaped notch, and the notch step portions 46, 46 at the left end of the biasing spring 43 are engaged with a locking portion 47 inside the left side of the movable piece 42. , each of the above elements 35~
47 constitutes an action switch 34. The action switch 34 is a normally open switch that opens and closes between the fixed contact 48 on the lower surface of the fixed tongue piece 41 and the movable contact 49 on the left upper surface of the movable piece 42 in conjunction with the forward and backward movement of the plunger 31. 5, the action switch 34 is shown in the ON state.

Further, a metal plate 50 is formed as an insert in the switch base 33 facing the left extending end 40 of the aforementioned fixing piece 38, and an adjustment screw 51 is screwed into this metal plate 50.

This adjustment screw 51 is a screw for vertically adjusting the position of the fulcrum part 44 of the above-mentioned biasing spring 43 from outside the switch, and the upper end of this adjustment screw 51 is always connected to the bent lower end of the above-mentioned extension end part 40. When the adjustment screw 51 is operated, the biasing spring 43
The position of the fulcrum portion 44 of the movable piece 42 can be variably operated in the vertical direction, and at the same time, the movable contact 4 on the movable piece 42 can be moved against the fixed contact 48 via the urging spring 43.
9 contact pressure changes.

By the way, as is clear from the above description, the input fixed terminal 35, the output fixed terminal 36, and the metal plate 50 are each independent members, and each is formed as an insert in the switch base 33. Furthermore, although the fixing piece 38 is integrally formed with the input fixed terminal 35, this is a separate member that is separated from the fixing tongue piece 41 that is integrally formed with the output fixed terminal 36.

Therefore, the number of parts for the pressure switch increases,
There are disadvantages such as high material cost, and in addition, it is necessary to mutually position the input fixed terminal 35, output fixed terminal 36, and metal plate 50 during insert molding, which increases the number of assembly steps and reduces the size. There were problems such as insufficient accuracy and frequent failures.

(c) Purpose of the invention This invention aims to reduce the number of parts by integrally forming the terminal parts to be inserted into the switch base into the same member, thereby reducing material costs and assembly man-hours. The object of the present invention is to provide a terminal component for a pressure switch that improves the dimensional accuracy of each component and can also variably adjust the contact pressure of a movable contact with respect to a fixed contact.

(d) Structure of the invention This invention is a pressure switch that expands and contracts a pressure-receiving element in response to changes in fluid pressure, and opens and closes the contact portions of the action switch by the forward and backward movement of a plunger that is linked to the pressure-receiving element. A terminal component in which an input fixed terminal and an output fixed terminal that are integrally connected to a single connecting frame are provided in parallel in the same plane as the connecting frame, and a fixed tongue piece is bent in a right angle direction at the tip of the output fixed terminal. At the same time, at the tip of the input fixed terminal, a fixing piece facing the fixing tongue is bent in a right angle direction, and spring engaging parts are provided at both bent portions of the fixing piece, and the fixing tongue is provided with a spring engaging part. The spring engaging part on the near side is configured to be able to be bent and deformed by a narrow part provided on the fixed piece, and the input fixed terminal has a plate part integrally bent in a right angle direction on the lower side of the fixed piece, A screw hole for contact pressure adjustment is formed below the bent portion of one side of the fixed tongue in the plate portion.

(e) Effects of the invention According to this invention, the plate part is equipped with a fixed input terminal, a fixed output terminal, a fixed tongue piece, a fixed piece, a pair of spring engaging parts, a narrow part, and a screw hole for contact pressure adjustment. Since everything is integrally molded, insert molding can be performed on the switch base while maintaining a constant positional relationship, and then the input fixed terminal and output fixed terminal can be separated by separating the connecting frame. Can be made independent.

Therefore, the terminal component is made of an integral member, which has the effect of reducing material costs.

Furthermore, since the integral member is insert-molded, the number of assembly steps can be reduced.

Furthermore, since the terminal parts can be formed into an integral part using only press processing, processing is simple and has the effect of improving processing accuracy and assembly accuracy.
In addition, since it is an integral member, parts do not fall off due to external impact during assembly, etc., and since it is an integral member, dimensional and characteristic accuracy can be maintained over a long period of time.

In addition, since a screw hole for contact pressure adjustment is formed in the plate portion, the contact pressure of the movable contact with respect to the fixed contact can be variably adjusted by the adjustment screw threaded into the screw hole.

(F) Embodiment An embodiment of this invention will be described below based on the drawings.

Fig. 1 shows a perspective view of the terminal part of the pressure switch, Fig. 2 shows a partially cutaway front view, Fig. 3 shows a plan view, and Fig. 4 shows insert molding of this terminal part in the switch base 33 of the pressure switch. FIG.

That is, the input fixed terminal 2 and the output fixed terminal 3 are integrally connected to a single elongated connecting frame 1 and project in parallel on the same side within the same plane as the connecting frame 1.

The tip of the output fixed terminal 3 is bent at a right angle to form a fixed tongue piece 4, and a fixed contact 5 is provided on the back side of the tongue piece 4.

The tip of the input fixed terminal 2 is bent at a right angle to the same side as the fixed tongue 4, forming a fixed piece 6 facing the fixed tongue 4. A narrow portion 7 with an opening 7a is formed in the extending portion of this fixed piece 6 facing the fixed tongue 4, so that the extending end 8 (bent portion) is configured to be flexible and deformable.

As is clear from FIGS. 1 and 2, this extending end portion 8 is a downwardly bent portion, and the other end of the fixed piece 6 on the opposite side is also bent downwardly. , and bent portions 9 are formed, and spring engaging portions 10 and 11 are provided on both bent portions 8 and 9, respectively.

Among these spring joint parts 10 and 11, the spring engaging part 10 provided on the extending end part 8 locks the fulcrum part 44 (see FIG. 6) of the biasing spring 43,
The other spring engaging portion 11 is the inner end 42a of the movable piece 42.
(See Figure 6).

Further, a plate portion 12 is formed integrally with the input fixed terminal 2 on the lower side of the fixed piece 6 and bent in a right angle direction. This plate portion 12 corresponds to the metal plate 50 shown in FIG. 5, and a screw hole 13 into which an adjustment screw 51 is screwed is provided directly below the extending end portion 8.

The above-mentioned terminal component is insert-molded as an integral component in the switch base 33 as shown in FIG. 2 and the output fixed terminal 3 are separated from each other as independent members.

Note that in FIG. 4, the same parts as in FIG. 5 are given the same numbers.

Here, in FIGS. 1 to 3, the connecting frame 1
Although a structure is shown in which a set of input fixed terminals 2 and output fixed terminals 3 are formed, in reality, the connecting frame 1 is a long one, and this connecting frame 1
A large number of sets of terminal parts, which are integral parts, are punched out by press working, and each set is separated and insert-molded into the switch base 33 of the pressure switch.

According to the embodiment described above, since the terminal component described above is formed from an integral member, it is possible to reduce the material cost, and it is possible to easily form it by press working. Machining accuracy,
It has good assembly accuracy and can significantly reduce assembly man-hours.

Furthermore, there are no parts falling off during assembly, and dimensional accuracy and characteristic accuracy can be maintained over a long period of time.

In addition, since a screw hole 13 for contact pressure adjustment is formed in the plate portion 12 described above, the contact pressure of the movable contact with respect to the fixed contact can be variably adjusted by the adjustment screw 51 screwed into the screw hole 13. There is an effect that can be achieved.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the terminal part of the pressure switch according to the present invention, Fig. 2 is a partially cutaway front view of the terminal part, Fig. 3 is a plan view of the same, and Fig. 4 shows the above terminal part assembled. A vertical cross-sectional view of a pressure switch, FIG. 5 is a vertical cross-sectional view of a pressure switch incorporating conventional terminal parts,
6 is an exploded perspective view of a portion of FIG. 5. FIG. 1... Connection frame, 2... Input fixed terminal, 3
... Output fixed terminal, 4 ... Fixed tongue piece, 6 ... Fixed piece, 7 ... Narrow part, 8, 9 ... Bent part, 10, 1
1... Spring engaging part, 12... Plate part, 13...
...Screw hole, 29...Pressure receiving element, 31...Plunger, 34...Action switch.

Claims (1)

[Claims for Utility Model Registration] A plunger 3 that expands and contracts a pressure receiving element 29 in response to changes in fluid pressure and is interlocked with this pressure receiving element 29.
It is a terminal part of a pressure switch that opens and closes between the contact parts of an action switch 34 by the forward and backward movement of 1, and the input fixed terminal 2 and the output fixed terminal 3 which are integrally connected to one connecting frame 1 are connected to the connecting frame. 1
A fixed tongue piece 4 is bent in a right angle direction at the tip of the output fixed terminal 3, and a fixing piece 6 is provided at the tip of the input fixed terminal 2 in a direction toward the fixing tongue piece 4. The fixed piece 6 is bent at right angles, and the bent portions 8 and 9 at both ends of the fixing piece 6 are provided with spring engaging portions 1.
0 and 11, and the spring engaging portion 10 on the side closer to the fixed tongue piece 4 is
The fixed piece 6 is configured to be able to be bent and deformed by a narrow portion 7, and the input fixed terminal 2 is integrally formed with a plate portion 12 bent in a right angle direction on the lower side of the fixed piece 6. A terminal component for a pressure switch, in which a screw hole 13 for contact pressure adjustment is formed below the bent portion 8 on the fixed tongue piece 4 side.