JPS6142267Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a thermostat used as a temperature protection device for electric heating equipment such as hair dryers. Conventionally, a thermostat of the type shown in FIG. 2 has a thermally responsive piece 3 disposed between a substrate 1 and a movable piece 2, and when the thermally responsive piece responds to heat and is reversely displaced in an arch shape, the movable piece All of them are of the type in which the contacts 5 and 6 are opened by pushing up, but in the ratio type, the thermally responsive pieces are structurally hidden by the board and the movable piece, so they are not affected by the ambient temperature. This has been a drawback in that changes in temperature have been a hindrance in being transmitted to the thermally responsive piece, slowing down the ability to follow thermal responses to temperature changes. In order to improve this drawback, methods such as providing ventilation holes 4 in the substrate have been attempted, but the current situation is that the effects are not necessarily satisfactory. The present invention was devised to eliminate the above-mentioned drawbacks, and its purpose is to place the thermally responsive piece on the outermost side and expose it directly to the hot atmosphere under a configuration that can sufficiently secure the current capacity of the movable plate. The object is to improve thermal response followability by touching the material. Hereinafter, one embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a terminal 8 having a hook portion 11 made of a cut and raised piece is fixed to one end of a substrate 1 made of porcelain, heat-resistant resin, or the like. Then, a hook portion 1 consisting of a movable contact 5 and a cut and raised piece is provided.
0 is provided at one end, and the other end of the movable piece 2 is fixed onto the terminal 8. Furthermore, a terminal 9 is crimped to the other end of the substrate 1 by a rivet 6' having a fixed contact 6, thereby forming a switch mechanism. Further, the terminal 8 is provided with claw parts 12 and 13, the movable piece 2 is formed with a convex part 7 and a hole 14, and the hook part 11 of the terminal 8 is provided with the above-mentioned hole 14.
4 and is arranged to protrude upward. The repulsion reversal type thermally responsive piece 3 is inserted between the hook portions 10 and 11 and locked. In this case, the claws 12 are bent upright to prevent the thermally responsive pieces 3 from falling off. Since the present invention has the above-described configuration, when the thermally responsive piece 3 responds thermally to a rise in temperature, rebounds, reverses, and is displaced in an inverted arch shape, the convex portion 7 of the movable piece uses the hooks 10 and 11 as fulcrums. In order to press the hook 10, the hook 10 is pushed upward, and the contact 5 is opened and the electric circuit is opened. Next, when the ambient temperature decreases and reaches the return temperature of the thermally responsive piece, the thermally responsive piece 3 returns to its original state, and the contact point 5 returns due to the springiness of the movable piece, thereby closing the electrical circuit. During this series of operating processes, the thermally responsive piece is always located above the movable piece due to its structure, so almost its entire surface comes into direct contact with the thermal atmosphere without being blocked by other parts. It turns out. Further, since the contact with other parts is limited to a line contact at both ends of the thermally responsive piece, the escape of heat to other parts due to heat conduction can be minimized. Due to the above two types of effects, the ability to follow thermal response to changes in ambient temperature is highly improved, so it is possible to respond well to rapid temperature rises caused by abnormalities in electric heating application equipment, and It has the effect of being able to respond thermally and interrupt the electrical circuit in an extremely short time at a precisely planned operating temperature. By the way, compared to the thermostat with a conventional switch mechanism and the thermostat of the present invention,
The table below shows an example of the results of a thermal response followability comparison test conducted while replacing the same thermally responsive pieces.

[Table] As is clear from the test results, the response time was shortened by about 25% compared to the conventional type, indicating that the effect was highly significant. In addition, most of the production methods are punching, bending, molding, and caulking using press machines, so they are effective in mass-producing high-precision products efficiently, so they are highly accurate and reliable. It is possible to supply thermostats with excellent performance and performance in large quantities to the market at low cost, and this greatly contributes to the development of industry and ensuring the safety of society. In addition, since it is sufficient to form a relatively small hole 14 in the movable piece 2 to allow the hook portion 11 to pass through, the current capacity of the movable piece 2 does not decrease. Note that the shape of the heat-responsive piece 3 does not necessarily have to be particularly rectangular, but can be made in many different shapes, such as circular, diamond-shaped, polygonal, or other shapes, or with a locking hole or groove to prevent it from falling off. Of course, other shapes are possible, but in this example, the most orthodox shape is shown.

[Brief explanation of the drawing]

FIG. 1 [ ] is a partially exploded perspective view of the thermostat of the present invention, FIG. 1 [ ] is a sectional view of the thermostat of the present invention, and FIG. 2 is a sectional view of a conventional thermostat. 1: Board, 2: Movable piece, 3: Thermal response piece, 4: Ventilation hole, 5: Movable contact, 6: Fixed contact, 6': Rivet, 7: Movable piece protrusion, 8, 9: Terminal, 1
0, 11: Hook portion, 12, 13: Claw portion, 14: Hole.

Claims (1)

[Scope of utility model registration request] In a thermostat structured to open or close an electric circuit by transmitting the thermal response operation of a repulsion reversal type thermally responsive piece to a switch mechanism, a terminal 8 having a hook portion 11 made of a cut and raised piece is connected to a fixed contact 6. The terminals 9 are attached to both ends of the board 1, and the movable contacts 5 and hooks 10 consisting of cut and raised pieces are attached.
The other end of the movable piece 2 provided at one end is fixed to the terminal 8, and the hook portion 11 of the terminal 8 is protruded by passing through the hole 14 formed at the other end of the movable piece 2. arranged, the hook portion 10,
1. A thermostat characterized in that the thermally responsive piece 3 is disposed at the outermost side of the switch mechanism by locking the thermally responsive piece 3 between the thermostats 11 and 11.