JPH09198980A - Manual return thermostat - Google Patents

Abstract

PROBLEM TO BE SOLVED: To maintain the cutoff condition even when a reset shaft is held inserted for any reason. SOLUTION: The thermostat TH1 is structured so that the internal connection between terminals 10, 11 is broken by a snap motion of a bimetal 15 and it is restored by insertion of a reset shaft 9. Two sets of contacts are provided, consisting of movable contacts 3, 4 moving in response to the snapping motion of the bimetal 15 or the inserting motion of the reset shaft 9 and stationary contacts 1a, 2a in the fixed arrangement in confronting the movable contacts 3, 4. When the bimetal 15 is in a snap motion, the contacts 1a, 3 are opened, and when the reset shaft 9 is inserted, the contacts 2a, 4 are opened, and the condition is maintained as long as the reset shaft 9 is inserted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermostat that detects abnormal heating of a device to prevent damage to the device, and particularly relates to internal connection between connection terminals even when a reset shaft is continuously pressed. Trip free thermostat that keeps the
stat).

[0002]

2. Description of the Related Art A thermostat is an electric component that switches a power source to a cutoff state by a snap action of a bimetal when an equipment reaches an abnormal temperature and keeps this state thereafter. Then, in the manual recovery type thermostat, after recovering from the abnormal state of the device, the reset shaft is pushed to restore the bimetal to the original state, and the device is returned to the usable state. FIG. 16A illustrates the manual resetting thermostat 40 in the initial state, which includes a bimetal 41 that performs a snap operation, and a guide pin 43 that transmits the movement of the bimetal 41 to the contact spring 42.
A reset shaft 44 and the like provided so as to be capable of contacting the contact spring 42 are shown. Here, a movable contact 45 is fixed to the tip of the contact spring 42, and a fixed contact 46 is provided facing the movable contact 45. In addition, the movable contact 45
Is connected to the connecting terminal 48 via the contact spring 42 and the movable side metal fitting 47, and the fixed contact 46 is connected to the connecting terminal 50 via the fixed contact metal fitting 49. In addition, each of these parts includes a base 51, an inner lid 52, and a cap 53.
It is held by. FIG. 16B shows a state in which the device has reached an abnormal temperature, in which the guide pin 43 and the contact spring 42 are pushed down by the snap operation of the bimetal 41, and the movable contact 45 and the fixed contact 46 are opened. Is shown. Manual reset type thermostat 40
Now, even if the equipment temperature drops to room temperature, the bimetal 41
16 maintains the curved state of FIG. 16 (b), it is necessary to push the reset shaft 44 to return the bimetal 41 to the initial state of FIG. 16 (a). FIG. 17 illustrates a reset initial state (a) in which the reset shaft 44 is inserted and a state (b) in which the reset shaft 44 is inserted and the bimetal 41 is returned to the initial state. Reset shaft 44
When the reset shaft 44 is released after pressing, the thermostat 40 returns to the state shown in FIG. 16A, but the upward biasing force of the contact spring 42 maintains the contact state between the movable contact 45 and the fixed contact 46. It

[0003]

As described above, in the normal case, even if the temperature rises extremely due to an abnormality during use of the device, when the temperature reaches a predetermined value, the bimetal operates to stop the power supply to the device. To avoid danger. Then, after the device is returned to normal temperature and the cause of the abnormality is removed, the reset shaft of the thermostat is pressed to restore the bimetal to the initial state, whereby the device can be normally operated again. However, if the reset shaft 44 of the thermostat is held in a pushed state for some reason during use of the device, the thermostat reset shaft 44 is held in the state of FIG. 17B. Then, even if the equipment reaches an abnormally high temperature thereafter, the bimetal 4
In No. 1, the snap operation cannot be performed, and the contact is not opened, so that energization to the device is continued and a dangerous state cannot be avoided. Also, the conventional thermostat 40
In this case, since the reset shaft 44 moves in response to external vibration or the like, the reset shaft 44 and the base hole 51a may rub against each other to generate powder, and this powder is generated in the contact contact portions 45, 46.
If it is sandwiched between the two, contact failure may occur (Fig. 16).
Further, when the thermostat 40 is attached so that the reset shaft 44 is on the upper side, the reset shaft 4 in the free state is
4 is inserted until it comes into contact with the contact spring 42, so in response to the snap operation of the bimetal 41, the reset shaft 4
4 sometimes jumped up violently and collided with the outer periphery 51b of the base hole or the like. If this shock is repeated, the reset shaft 44 may crack. The present invention has been made in view of these problems,
An object of the present invention is to provide a thermostat capable of maintaining the cutoff state of internal connection even if the reset shaft is held in the inserted state for some reason. Further, it is an object to provide a thermostat that is free from the risk of contact failure due to the rubbing of the reset shaft even when it is mounted on a device that vibrates violently, and that does not damage the reset shaft even if the bimetal repeatedly snaps. To do.

[0004]

In order to achieve the first object, the invention according to claim 1 is such that the internal connection between the connection terminals is interrupted by the snap action of the heat sensitive body, and the reset shaft is inserted. A manual resetting type thermostat that restores internal connection between connection terminals, and includes a movable contact that moves in response to a snap operation of the heat sensitive body or an insertion operation of the reset shaft, and a fixed arrangement facing the movable contact. When the heat sensitive body snaps, the first opening / closing contacts are provided.
When the reset shaft is inserted, the second set of opening / closing contacts is opened and the state is maintained as long as the reset shaft is inserted. ing. Here, it is preferable that the two movable contacts are projected from both ends of a movable metal member formed in a plate shape.
In this case, the projecting directions may be the same or opposite,
By arranging the spring member in the direction opposite to the projecting direction, the two opening / closing contacts can be reliably brought into contact with each other during normal operation. Also, make sure that the contact point between the reset shaft and the movable fitting is
When the reset shaft is inserted, the second set of open / close contacts in the contact state can be shifted to the open state by displacing the open / close contacts of the second set to the open / close contacts. The method of displacing the contact portion can be appropriately changed, but, for example, if a part of the movable fitting is formed to be bent toward the reset shaft or a part of the reset shaft is formed to project toward the movable fitting. good.

In order to achieve the above second object, the invention according to claim 2 is such that the internal connection between the connection terminals is interrupted by the snap action of the heat sensitive body, and the connection between the connection terminals is performed by inserting the reset shaft. A manual resetting type thermostat that restores internal connection, and is provided with a biasing means that biases the reset shaft in a direction to push it out, whereby the reset shaft moves unless the reset shaft is artificially inserted. I try not to. The present invention is effective when a thermostat is attached to a device that vibrates violently, and since the reset shaft does not move, it is suitable in that the mounting posture of the thermostat is not limited. The specific structure of the biasing means can be changed in design as appropriate, but for example, the wire member may be formed by bending.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail based on embodiments. FIG. 1 illustrates a thermostat TH1 of a manual resetting type which is an embodiment of the present invention. This thermostat TH1 has a first feature in that a movable metal fitting 7 formed by fixing the movable contacts 3 and 4 and the leaf springs 5 and 6 is mounted between the fixed contact metal fittings 1 and 2 having an L-shaped cross section. There is. The movable contacts 3, 4 and the leaf spring 5,
Although 6 is fixed to both ends of the movable metal fitting 7 by caulking, it is merely fixed to the movable metal fitting 7 including the leaf springs 5 and 6 in consideration of easiness of assembly, and functionally, It is sufficient because the leaf springs 5 and 6 are installed at the predetermined positions. Also, FIG.
The thermostat TH1 has a second feature in that the shaft retainer 14 made of stainless steel wire for spring is inserted between the inner lid 12 and the reset shaft 9 (see FIG. 2). As illustrated, the reset shaft 9 is pushed out by the spring stainless wire 14 bent into a substantially C shape, so that the head 9a of the reset shaft 9 is locked in the bottom hole 8a of the base 8 and is stabilized. Therefore, in this thermostat TH1, there is no fear that the reset shaft 9 will move in response to vibration or the like, and even if the thermostat TH1 is attached upside down from the state shown in the figure, in response to the snap operation of the bimetal 15, There is no fear that the reset shaft 9 will bump into anything.

Other configurations are almost the same as those of the conventional thermostat, a reset shaft 9 is inserted into the bottom of a cylindrical base 8 having a bottom, and connecting terminals 10 and 11 are provided on the outer surface of the bottom of the base 8. It is installed. On the other hand, the opening side of the base 8 is covered with an inner lid 12 and a guide pin 13 is inserted. Further, a bimetal 15 that is a heat-sensitive body is attached to the upper side of the inner lid 12, and a cap 16 is put on the inner lid 12 and the base 8.
And are fixed. The fixed contact fittings 1 and 2 are brass plate members having an L-shaped cross section. Then, in the lower end of the fixed contact metal fitting 1 and the upper end of the fixed contact metal fitting 2,
Flat contact portions 1a and 2a made of silver alloy are provided to face the movable contacts 3 and 4, respectively. The movable contacts 3,
4 is a copper body 3a, 4a, a silver alloy top 3b,
4b and 4b are integrated to form a mushroom shape as a whole. The leaf springs 5 and 6 are stainless steel plates for springs, and as shown in FIGS. 3 and 4, respectively, are provided with opening holes 17 and 18 in the central portion and bent at both ends. In the assembled state, the leaf spring 5 has the bent piece 5a in contact with the bottom surface of the base 8 (see FIG. 5).
On the other hand, in the leaf spring 6, the bent piece 6a is in contact with the inner lid 12 (see FIG. 5B).

FIG. 6 shows the movable fitting 7, which is a plan view (a), a right side view (b), and A-A, respectively.
A sectional view (c) and a BB arrow view (d) are shown.
As shown in the figure, the movable fitting 7 is a plate member made of brass formed in a substantially T shape, and includes a rectangular plate-shaped main body portion 7a and a main body portion 7a.
It is composed of both hand portions 7b, 7b extending orthogonal to a. Mounting holes 19 and 20 for mounting the movable contacts 3 and 4 are formed on the left and right of the main body portion 7a, and a bending projection portion 7c that abuts the guide pin 13 is formed in the center of the main body portion 7a. ing. Further, both hands 7b, 7b have their ends bent and deformed in a stepped shape, and are positioned below the main body 7a by the thickness of the movable fitting 7 in the assembled state (see FIG. 1). ). FIG. 7 illustrates the reset shaft 9, and shows a plan view (a), a right side view (b), and a front view (c), respectively. The reset shaft 9 is formed of resin or ceramic in a substantially rectangular parallelepiped shape, and is biased in the direction in which it is pushed out by the shaft retainer 14 as described above. The base 8 and the inner lid 12 are made of an insulating material such as resin or ceramic, and the guide pin 13 is also made of ceramic or the like.

Next, the assembling procedure of the thermostat TH1 having the above structure will be described. FIG.
(A) is the figure which looked at the base 8 from right above, The bottom hole 8a for inserting the reset shaft 9 and the fixed contact metal fittings 1, 2 are shown.
Bottom holes 8b, 8c for inserting the are shown. The cut grooves 8d, 8d are mounting grooves for inserting the shaft retainer 14, which is a stainless steel wire for spring, and the recess 8
Reference numerals e and 8e denote mounting recesses for inserting the bent pieces 5a of the leaf spring 5. To assemble the thermostat TH1, first, the fixed contact metal fitting 2 is inserted into the bottom hole 8c and fixed to the connection terminal 11 by caulking. After inserting the reset shaft 9 into the bottom hole 8a, the cut grooves 8d, 8
The shaft retainer 14 is inserted into d (see FIG. 8B). After that, the movable metal fitting 7 to which the movable contacts 3 and 4 and the leaf springs 5 and 6 are attached is inserted (see FIG. 9A). After that, bottom hole 8
The fixed contact metal fitting 1 is inserted into b and fixed to the connection terminal 10 by crimping (see FIG. 9B). Then, by mounting the inner lid 12, the guide pin 13, the bimetal 15, and the cap 16, the assembly of the thermostat TH1 is completed.

The thermostat T completed in this way
Next, the operation of H1 will be described. The thermostat TH1 in the initial state is in the state shown in FIG. 1, and the movable contacts 3 and 4 and the fixed contact fittings 1 and 2 are in contact with each other, so that the connection terminal 10 and the connection terminal 11 are in a conductive state and the power supply is turned on. It becomes the state of throwing. In this state, if the device reaches an abnormally high temperature for some reason, the bimetal 15 snaps and shifts to the state of FIG. Specifically, the guide pin 13 also descends in response to the snap operation of the bimetal 15, and the tip of the guide pin 13 pushes down the bent protrusion 7c of the movable fitting 7. The guide pin 13 tries to push down the bending protrusion 7c located at the center of the movable metal fitting 7, but since the movable contact 4 is in contact with the fixed contact metal fitting 2, the leaf spring 5 contracts and the movable contact 3 The contact state between the fixed contact metal fitting 1 and the fixed contact metal fitting 1 is released. That is, since the movable contact 3 and the fixed contact metal fitting 1 shift to the non-contact state, the power supply of the device is cut off, and a dangerous state such as device damage is avoided in advance.

After that, when the cause of the abnormality in the device is eliminated, it is necessary to artificially push the reset shaft 9 to restore the initial state. When the reset shaft 9 is pushed against the urging force of the shaft retainer 14, the tip of the reset shaft 9 is brought into contact with both hand portions 7b, 7b of the movable metal fitting 7 to push up the movable metal fitting 7. Therefore, first, the movable contacts 3 and 4 and the fixed contact fittings 1 and 2 are both in a non-contact state (see FIG.
(B)) After that, when the reset shaft 9 is further pushed in, the bimetal 15 bends in the opposite direction, and the movable contact 3 and the fixed contact fitting 1 shift to a contact state (FIG. 10).
(C)). If the reset shaft 9 is released in this state,
The reset shaft 9 is pushed back by the urging force of the shaft retainer 14 and returns to the initial state of FIG. In the initial state of FIG. 1, the movable contacts 3 and 4 and the fixed contact fittings 1 and 2 are both in contact with each other, and the power is turned on. Similarly, when the reset shaft 9 is pushed in when the thermostat is in the initial state (FIG. 1), the state shifts from FIG. 1 to FIG. 10C, so that the movable contact 4 and the fixed contact metal fitting 2 are separated from each other. It becomes a non-contact state. As is clear from the above operation, when the reset shaft 9 is pushed in, unless the reset shaft 9 is pushed back to the state shown in FIG.
Since the non-contact state of No. 1 is maintained, even if the reset shaft 9 is held in the state of FIG. 10C due to some trouble, there is no possibility that the power is turned on. In other words, unlike the conventional thermostat, there is no fear that the power supply is unconditionally turned on and the subsequent abnormal situation cannot be dealt with.

[Second Embodiment] FIG. 11 shows a thermostat TH2 according to a second embodiment of the present invention. This thermostat TH2 is characterized in that the shape of the reset shaft 9A is different, that the two hand portions 7b of the movable fitting bent and deformed into a step shape are unnecessary, and that the shaft retainer 14 is not provided. The thermostat TH1 of the first embodiment is substantially the same. That is, the thermostat TH2 has the protrusion 21 on the top of the reset shaft 9A, and the protrusion 21 is provided close to the movable contact 4. Therefore, if the reset shaft 9A is pushed in after the bimetal 15 snaps, the reset shaft 9
A is brought into contact with a position displaced from the center of the movable fitting 7 to the movable contact 4 (see FIG. 11B), and FIG.
After passing through the state of (a), it shifts to the state of FIG. Also, when the reset shaft 9A is pushed from the initial state, the state shown in FIG. 11A shifts to the state shown in FIG. 12B. Therefore, the reset axis 9
Even if A is pushed in and held in the state of FIG. 12 (b), there is no danger of power being turned on.

[Third Embodiment] FIG. 13 shows a thermostat TH3 according to a third embodiment of the present invention, and FIG. 14 shows a perspective view of main components of the thermostat TH3. It is a thing. FIG.
As shown in (a), the thermostat TH3 includes a movable metal fitting 7 formed in a substantially T shape by a main body plate 7a and an orthogonal plate 7b, and one end of the main body plate 7a has a movable contact 3 and a leaf spring. 5 are fixed to each other, and the orthogonal plate 7b, the movable contact 4, and the plate spring 6 are fixed to the other end of the main body plate 7a. In this embodiment, the leaf springs 5 and 6 are both fixed downward, and the tips thereof are in contact with the recesses 8e formed in the base 8 (FIG. 13). The biasing force of the leaf spring 5 is set to be weaker than the biasing force of the leaf spring 6. In addition,
Since the movable contacts 3 and 4 are fixed upward, the flat contact portions 1a and 2a of the fixed contact metal fittings 1 and 2 face the top portions 3b and 4b of the movable contact metal fittings 1 and 2, respectively.
Is provided below the tip of the.

In the third embodiment, a guide receiving member 22 having a U-shaped cross section is provided between the guide pin 13 and the movable fitting 7.
Is arranged. The tip of the guide pin 13 is brought into contact with the central recess 22a of the guide receiver 22, and the central protrusion 22 provided on the opposite side of the central recess 22a.
b is brought into contact with the main body plate 7a of the movable fitting 7. The reset shaft 9 is composed of a contact plate 9a formed by cutting out a part of a flat plate and a shaft body 9b that is operated at the time of reset. 9a is abutted.
The central portion 23 is provided between the contact plate 9a and the orthogonal plate 7b.
A metal fitting pusher 23 having a substantially L-shaped cross section formed by extending a folded back tongue piece 23b and a straight tongue piece 23c from a is arranged (see FIG. 14 (b)). Here, the folded back tongue piece 23b,
After passing through both sides of the main body plate 7a in the width direction, the tip end of the 23b is placed on the contact plate 9a. Similarly, the straight tongue pieces 23c, 23c pass through both sides of the guide receiver 22, and then the tip ends thereof are placed on the orthogonal plate 7b.

Next, the operation of the thermostat TH3 having the above structure will be described. In a normal operation state, the tops 3b and 4b of the movable contacts 3 and 4 and the fixed contact fittings 1 and 2 are urged by the urging forces of the leaf springs 5 and 6.
Since the flat contact portions 1a, 2a of the
0 and the connection terminal 11 become conductive and the power is turned on (FIG. 13). In this state, if the device reaches an abnormally high temperature for some reason, the bimetal 15 snaps. Then, in response to the snap operation of the bimetal 15, the guide pin 13 also descends, the tip of the guide pin 13 pushes down the guide receiver 22, and the central protrusion 22b of the guide bearing 22 pushes down the movable fitting 7 (see FIG. a)). In this case, the central protrusion 22b presses almost the central portion of the movable fitting 7, but since the biasing force of the leaf spring 5 is weaker than the biasing force of the leaf spring 6, only the contact between the movable contact 3 and the fixed contact fitting 1 is released. To be done. As a result, the connection terminal 10 and the connection terminal 11 are brought out of electrical conduction, and a dangerous state such as equipment damage is avoided.

When the shaft body 9b of the reset shaft 9 is artificially pushed in after the cause of abnormality of the device is eliminated, the contact plate 9a of the reset shaft 9 comes into contact with the guide receiver 22. As a result, a force is applied to the bimetal 15 via the guide receiver 22 and the guide pin 13. Further, by inserting the shaft main body 9b, the folded back tongue piece 23b of the metal fitting pusher 23 is pushed up via the contact plate 9a. Then, the uppermost portion A of the main body portion 23a of the metal fitting pusher 23 is the inner lid 12
And the straight tongue piece 23c is pushed down with the uppermost portion A as a fulcrum (see FIG. 15B). Therefore, when the reset shaft 9 is pushed in, the state shifts from the state of FIG. 15B to the state of FIG. 15C, and the movable contact 3 and the fixed contact metal fitting 1 contact each other, while the movable contact 4 The contact between the fixed contact metal fitting 2 and the fixed contact metal fitting 2 is released. Further, in parallel with this operation, the curved state of the bimetal 15 is reversed. That is, when the reset shaft 9 is pushed in, the curved state of the bimetal 15 is reversed, and the movable contact 4 and the fixed contact metal fitting 2 are brought into non-contact with each other, so that the connection terminal 10 and the connection terminal 11 are kept in the disconnected state. It Further, even when the reset shaft 9 is pushed in from the initial state shown in FIG. 13, the state shifts to the state of FIG. 15C, so that the reset shaft 9 is maintained in the state of FIG. 15C due to some abnormality. Even if it does, the power of the equipment is not turned on.

Although the embodiments of the present invention have been described above, they can be appropriately modified without departing from the spirit of the present invention. For example, although the attachment of the shaft retainer is omitted in the second and third embodiments, the shaft retainer may be attached if necessary. Similarly, the concrete shapes of the movable fitting 7, the leaf springs 5, 6 and the like need not be limited to those shown in the figure, and those having the same function may be appropriately designed. Further, although the present invention has been described with respect to a thermostat, the configuration of the present invention can be applied to other switches such as a pressure switch.

[0018]

As described above, according to the first aspect of the present invention, the movable contact that moves in response to the snap operation of the heat sensitive body or the insertion operation of the reset shaft, and the fixed arrangement facing the movable contact. Two sets of open / close contacts consisting of fixed contacts are provided. Therefore, when the heat sensitive body snaps, the first set of the opening / closing contacts is opened, and when the reset shaft is inserted, the second set of the opening / closing contacts is opened and reset. Since the state can be maintained as long as the shaft is inserted, the power is not supplied to the equipment and a dangerous situation does not occur. Further, the invention of claim 2 is provided with an urging means for urging the reset shaft in a direction of pushing it out, and prevents the reset shaft from moving unless the reset shaft is artificially inserted. Therefore, it is effective when attaching a thermostat to a device that vibrates strongly,
Further, since the reset shaft does not move, it is effective in that the mounting posture of the thermostat is not restricted.

[Brief description of drawings]

FIG. 1 is a thermostat TH which is a first embodiment of the present invention.
2 is a diagram showing an initial state of operation 1;

FIG. 2 is a view showing a mounted state of a shaft retainer in a thermostat TH1.

FIG. 3 illustrates a leaf spring fixed to an upward movable contact.

FIG. 4 illustrates a leaf spring fixed to a downward movable contact.

FIG. 5 illustrates a mounted state of the leaf springs of FIGS. 3 and 4.

FIG. 6 illustrates a shape of a movable metal fitting.

FIG. 7 illustrates a shape of a reset shaft.

FIG. 8 is a diagram showing a base alone (a) and a state (b) in which a fixed contact metal fitting, a reset shaft, and a shaft retainer are inserted into the base.

FIG. 9 illustrates a state in which a movable metal fitting having a leaf spring and a movable contact is inserted (a), and a state in which a fixed contact metal fitting is further inserted (b).

FIG. 10 is a diagram for explaining the operation of the thermostat TH1.

FIG. 11 is a thermostat T according to a second embodiment of the present invention.
It is what illustrated H2.

FIG. 12 is a diagram for explaining the operation of the thermostat TH2.

FIG. 13 is a thermostat T according to a third embodiment of the present invention.
It is what illustrated H3.

FIG. 14 is a perspective view showing main components of a thermostat TH3.

FIG. 15 is a diagram for explaining the operation of the thermostat TH3.

FIG. 16 is a view for explaining the operation of the conventional thermostat.

FIG. 17 is a diagram for explaining the operation of the conventional thermostat.

[Explanation of symbols]

 TH1 to TH3 Manual reset type thermostat 1, 2 Fixed contact metal fittings 1a, 2a Flat contact part (fixed contact) 3,4 Movable contact 5,6 Leaf spring 7 Movable metal fitting 9,9A Reset shaft 10,11 Connection terminal 14 Shaft holder ( Energizing means) 15 Bimetal (heat sensitive body)

Claims (7)

[Claims] 1. A manual resetting thermostat in which the internal connection between the connection terminals is interrupted by the snap operation of the heat sensitive body, and the internal connection between the connection terminals is restored by the insertion of the reset shaft, the snap operation of the heat sensitive body. Alternatively, there are two open / close contacts each including a movable contact that moves in response to the inserting operation of the reset shaft, and a fixed contact that is fixedly arranged facing the movable contact.
When the heat sensitive body snaps, the first set of the opening / closing contacts is opened, and when the reset shaft is inserted, the second set of the opening / closing contacts is opened. A manual resetting type thermostat, characterized in that the reset shaft is maintained as long as it is separated and the reset shaft is inserted. 2. The manual reset type thermostat according to claim 1, further comprising a biasing means for biasing the reset shaft in a direction to push the reset shaft, and the reset shaft is provided unless the reset shaft is artificially inserted. Manual resetting type thermostat, which is characterized by not moving. 3. The two movable contacts are protruded in opposite directions from both ends of a movable fitting formed in a plate shape, and spring members are arranged in opposite directions to the protruding direction of the movable contacts. The manual resetting thermostat according to claim 1, wherein the thermostat is a thermostat. 4. The two movable contacts are protruded in the same direction from both ends of a movable fitting formed in a plate shape, and spring members are arranged in opposite directions to the protruding direction of the movable contacts. The manual resetting thermostat according to claim 1, wherein 5. The contact point between the reset shaft and the movable fitting is displaced toward the second set of open / close contacts, whereby the contact state when the reset shaft is inserted The manual resetting thermostat according to claim 3, wherein the second set of open / close contacts is configured to easily shift to the open state. 6. The two spring members are set such that the biasing force of the spring member on one side is weaker than the biasing force on the other side,
The manual resetting thermostat according to claim 4, wherein the opening / closing contact in which the weaker spring member is arranged is opened in response to the snap operation of the heat sensitive body. 7. The reset shaft is biased in a direction in which the reset shaft is pushed out by a biasing means formed by bending a wire rod, whereby the reset shaft moves unless it is artificially inserted. The manual resetting thermostat according to any one of claims 3 to 6, wherein the thermostat is not provided.