JPH049711Y2 - - Google Patents

Description

[Detailed explanation of the invention] (1) Technical field to which the invention pertains The present invention relates to switches, and in particular, to the invention, the invention relates to switches, and in particular, to This relates to a switch that allows you to visually check the temperature rise.

(2) Background of the invention When a large number of switches are used in equipment, equipment, or systems, it is important to determine whether each switch contact is operating within an acceptable range when the switches are in operation. This cannot be determined unless the temperature of each contact switch is individually measured or the current flowing through them is individually measured, and it is expected that it will take an extremely large amount of time and effort to do so. Ru.

In such a device or system, it is desirable to detect in advance overheating of the switch contacts, which may lead to a serious accident, and to prevent failures caused by overheating of the contacts.

(3) Purpose of the invention The present invention has been made by paying attention to the above-mentioned conventional situation, and therefore, the purpose of the present invention is to prevent overcurrent from flowing to the switch due to an accident in the equipment or system, or when the switch is contacted. If the temperature of the switch contact rises above a certain level due to instability, the abnormality can be easily confirmed visually by changing the color, thereby preventing equipment or system accidents caused by the switch. The objective is to provide a new switch that can prevent such problems.

(4) Structure of the invention In order to achieve the above object, the switch according to the invention includes a common contact piece provided in the switch body, a movable contact piece placed on the common contact piece, and a movable contact piece that can be attached to the left and right sides. In a switch equipped with a contact mechanism that opens and closes by tilting, the switch is attached to a device,
A bar handle for tilting the movable contact piece from side to side is provided on the panel surface of the device, and an interlocking member between the bar handle and the movable contact piece is formed of a material having good heat conductivity. The rod handle is provided with a temperature indicating material on the rod handle exposed to the outside.

(5) Embodiments of the invention Next, preferred embodiments of the invention will be specifically explained with reference to the drawings.

1 and 2 are a sectional view and an exploded perspective view showing a first embodiment of a switch according to the present invention.
In the figure, reference numeral 11 indicates a switch body, and the upper part of the switch body is covered with a cover 12 having a sleeve 13 provided above. A fixed contact piece 14 and a common contact piece (receiving piece) 15 are planted in the inner bottom of the switch body 11, and a movable contact piece 16 that switches between the contact pieces 14 and 15 is placed on top of them. ing. The lower end of the push rod 18 is placed on the movable contact piece 16, and the upper end of the push rod is inserted into the lower hole (not shown) of the rod handle 19, which tilts from side to side using the enlarged portion within the sleeve 13 as a fulcrum. (not shown), and the push rod 18 is fitted with the rod handle 1.
It is configured to slide on a movable contact piece 16 in conjunction with the switch 9 to perform a switch switching operation.

A cylindrical temperature indicator piece 20, which is the main part of the present invention, is fitted onto the upper side surface of the bar handle 19, and a locking piece 21 is inserted from above.
It is locked by. The temperature indicator piece 20 is made of a temperature indicator material that changes color when a predetermined temperature is reached, and various types are commercially available, such as those with color change temperatures of 40°C, 50°C, 60°C, 70°C, and 80°C to 130°C. In the illustrated embodiment, a tape-like temperature indicating material is formed into a cylindrical shape to form a temperature indicating patch, and instead of this cylindrical temperature indicating piece, a temperature indicating paint, which is one of the temperature indicating materials, may be applied. As mentioned above, there are various temperature ranges for the temperature indicating material, and it can be selected depending on the purpose of the switch or the place where it will be used.Moreover, if it is in the form of a tape, it can be pre-heated together with the switch, for example, at 60°C or 70°C. If the switch is sold with temperature indicators of 80°C and 80°C attached, it will be extremely convenient for the switch user to attach one of them to a predetermined part of the handle depending on the purpose of the switch. Also,
Temperature-indicating materials include reversible temperature-indicating materials that change color once at a certain temperature but return to their original color when cooled and can be used repeatedly, and reversible temperature-indicating materials that clearly change color at a certain temperature and do not return to their original color once they change color. Although there are irreversible temperature indicating materials, any of them can be used depending on the purpose and necessity.

Next, a push rod 18 for operating the movable contact piece 16
However, in accordance with the purpose of the present invention, in order to transfer heat to the upper part of the switch as quickly as possible, it is preferable to use a material with good thermal conductivity, such as ceramic or glass. Good too.

FIGS. 3a and 3b are perspective views showing only the handle of a second embodiment (a modified example of the handle) of the switch according to the present invention. Among them, a cap-shaped temperature indicator 20 is attached to the small diameter portion 19aa formed at the top of the bar handle 19a.
A shows an example in which it is covered, and b shows an example in which a temperature-indicating wafer pen 20b is fitted into a recess 19ba formed in the upper part of the bar handle 19b. The effects of this embodiment are almost the same as those of the first embodiment.

FIG. 4 is a sectional view of a main part showing a third embodiment of the present invention. This embodiment is an example in which the present invention is applied to a normal seesaw type switch, and the temperature indicating piece 20d is fitted into a recess formed in the upper part of the bar handle 19d. In this embodiment, since the fixed contact piece 14a, the common contact piece 15a, and the movable contact piece 16a are close to the push rod 18, heat is easily transferred to the rod handle 19d.
Therefore, the temperature indicator acts sensitively. That is, the part of the switch where heat is most likely to be generated is around the contact area between the fixed contact piece and the movable contact piece. In this embodiment, since the push rod 18 is arranged near the part where heat is most likely to be generated,
The heat generated at the contact part is transferred from the push rod 18 to the temperature indicator 20d.
It has the characteristics of being sensitive and quickly conducted.

Most of the internal mechanisms of toggle switches or waveform switches are of three types: seesaw type, swing type, and roller type. By the way, internal mechanisms other than the seesaw type have two contact parts for one circuit, so there is one more point where the switch becomes unstable than the seesaw type, and heat is generated at the contact parts. Since the contact point is one of the two, it is most advantageous to apply the present invention to a seesaw method rather than a swing method or a roller method. In other words, it can be seen that the application of the present invention to a switch with a seesaw structure and a movable contact piece in the form of a flat plate is the most efficient in terms of thermal efficiency.

(6) Effects of the invention The invention is constructed and operates as described above.According to the invention, the space between the bar handle and the movable contact piece is made of a material with good heat conductivity, and the surface of the panel is made of a material with good thermal conductivity. Since a temperature indicating material was provided on the exposed rod handle,
Abnormal situations in the switch contact mechanism are sensitively and quickly displayed on the bar handle, and abnormal situations can be detected extremely easily by visual inspection due to the function of the bar handle that opens and closes the switch.

According to the present invention, it is possible to immediately visually detect a switch that is in an abnormally heated state due to contact heating among a large number of switches, and to quickly take corresponding measures such as switching or shutting off the switch. This makes it possible to prevent accidents caused by overheating of the switch.

According to the present invention, the interlocking member between the switch contact mechanism and the rod handle is made of a material with good heat conductivity, and the rod handle is provided with a temperature indicator, so that the rod handle can notify abnormal situations of the switch. Therefore, the structure is simple and can be made compact, and the bar handle that must be operated to handle abnormal situations indicates the intention.Furthermore, since the bar handle protrudes from the switch body, it is the most visible. It is easy to touch and has the effect of clearly displaying abnormal situations.

Further, according to the present invention, since the switch itself performs a temperature indicating operation, there is no need for a separate device to indicate or display an accident with the switch. Furthermore, since the switch itself is provided with a temperature indicating material, there is no need for the switch itself to be particularly large, and it has the feature that it can be sufficiently applied to small-sized switches.

In addition to the toggle switch, the structure of the present application also includes
It has the feature that it can be applied to waveform switches and even push button switches.

[Brief explanation of drawings]

1 and 2 are cross-sectional views and partially exploded perspective views showing a first embodiment of the present invention, and FIGS. 3a and 3b are main views showing a second embodiment (a modified example of the handle) of the present invention. FIG. 4 is a sectional view of a main part showing a third embodiment of the present invention. 11...Switch body, 12...Cover, 13...
...Sleeve, 14, 14a...Fixed contact piece, 15,
15a... Common contact piece, 16, 16a... Movable contact piece, 18... Push rod, 19, 19a 19b, 19d
...Bar handle, 20, 20a, 20b, 20d...
Temperature indicating piece or temperature indicating paint, 21... Locking piece, 25...
...Spring.

Claims (1)

[Scope of utility model registration request] In a switch equipped with a contact mechanism in which a common contact piece is provided in the switch body, a movable contact piece is placed on the common contact piece, and the movable contact piece tilts left and right to open and close, the movable contact piece can be tilted left and right. 1. A switch characterized in that a rod handle is provided, an interlocking member between the rod handle and the movable contact piece is made of a material with good heat conduction, and a temperature indicating material is provided on the rod handle.