JPH0546194Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a switch that performs switching using a bimetal.

[Background technology]

A flat bimetal 1 as shown in Fig. 3 is
In the switch 8, the switch body 9 is arranged in parallel, the ends of both bimetals 1 in the same direction are fixed, and the switch body 9 is provided with a contact point on the opposing surface of the other end, and the switch body 9 is covered with a case 2.
When bimetal 1 receives an impact from the direction of the arrow, which is the direction in which bimetal 1 curves due to heat, it curves due to the inertial force of each contact 4 and 5 and hits case 2. At this time, if this impact is strong, the bimetal 1 will bend inward at the base 7 due to the heavy mass of the contact 5 provided on the bimetal 1, as shown by the two-dot chain line, and in the case of a normally closed contact, the contact 4 will The contact pressure with contact 5 changes, and in the case of a normally open contact, the gap between contacts 4 and 5 changes. This has the disadvantage that the temperature characteristics of the switch 8 change.

[Purpose of invention]

The present invention was devised in view of the above-mentioned problems, and its purpose is to provide a switch that can prevent deformation of the bimetal due to impact.

[Disclosure of invention]

(Embodiment) Fig. 1 shows an embodiment of the present invention, which is the same as the conventional example except for part A. When the bimetal 1 receives an impact from the direction of the arrow, which is the direction in which it curves, the contact 4 Due to the inertial force of the bimetal 1, the bimetal 1 is bent as shown by the two-dot chain line. At this time, an impact prevention part is formed at a position before the bimetal 1 curves and hits the inner wall of the case 2, as shown in part A. That is, the protrusion 3 is provided to protrude from the inner wall of the case 2 against which the bimetal 1 curves. Here, the protrusion 3 is formed by bending the bimetal 1 due to impact.
It is formed to have a substantially triangular cross section with one side being an inclined surface that matches the angle of the contact point 5 of the bimetal 1 at the moment when the tip 1a of the bimetal 1 comes into contact with the inner wall of the case 2. Therefore, by receiving the contact point 5 of the bimetal 1 which is curved by the impact with the protrusion 3, the moment of force can be made smaller than when the tip 1a of the bimetal 1 hits the case 2.
The force applied to the root 7 of the contact 5 of the bimetal 1 can be reduced. Moreover, if the tip 1a of the bimetal 1 is formed into a shape having a substantially triangular cross section with one side being an inclined surface that matches the angle of the contact point 5 of the bimetal 1 at the moment when it comes into contact with the inner wall of the case 2, as described above, The impact can be received by the surface of the contact 5 portion, which is a strong part of the bimetal 1, and the impact force can be dispersed at this time, so that the force applied to the root 7 of the contact 5 of the bimetal 1 can be further weakened.

[Effect of idea]

The present invention is a switch in which two bimetals are arranged side by side, the ends of these bimetals in the same direction are fixed, and the switch body is housed in a case, with contact points provided on the opposing surfaces of the other ends. A shock prevention part is provided at the position where the bimetal is curved and the contact comes into contact with the inner wall of the case, and this shock prevention part is aligned with the angle of the bimetal contact at the moment when the tip of the bimetal comes into contact with the inner wall of the case. Since the cross section is approximately triangular with an inclined surface as one side, the impact prevention part receives the contact part of the bimetal that curves due to impact, which reduces the moment of force compared to when the tip of the bimetal hits the case. The force applied to the base of the bimetal contact can be reduced. Moreover, if the tip of the bimetal is formed into a shape having a substantially triangular cross section with one side being an inclined surface that matches the angle of the contact point of the bimetal at the moment when the tip of the bimetal comes into contact with the inner wall of the case, the impact will be absorbed by the bimetal. The impact force can be dispersed at this time, so
The force applied to the base of the bimetal contact can be further weakened. Therefore, there is an advantage that deformation of the bimetal due to impact can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an explanatory view of the main parts of the same, and FIG. 3 is an explanatory view of a conventional example. 1 is a bimetal, 2 is a case, 3 is a protrusion, 4 is a contact, and 8 is a switch.

Claims (1)

[Scope of utility model registration request] In a switch in which two bimetals are arranged side by side, the ends of these bimetals in the same direction are fixed, and the switch body is housed in a case with a contact point provided on the opposing surface of the other end, the bimetal is curved. A shock prevention part is provided at the position where the contact part contacts the inner wall of the case, and one side of this shock prevention part is formed by an inclined surface that matches the angle of the bimetal contact part at the moment when the tip of the bimetal comes into contact with the inner wall of the case. A switch characterized in that it has a substantially triangular cross section.