JPH0321024Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention relates to the improvement of electrical outlets, and more specifically, to reliably detect abnormally high temperatures at the connection between the electrical outlet and the plug, thereby preventing accidents such as fire outbreaks. It's all about safe electrical outlets.

[Prior Art] When using various electrical devices and machinery, an indispensable electrical outlet conventionally has a current supply section 2 and a plug socket 3, as shown in Fig. 3a and b. It is generally housed in a plastic case 1, and when a plug is connected to it, it functions to supply current to electrical equipment or machines.

However, with conventional electrical outlets, if an excessive current flows through the electrical outlet or if there is poor contact with the plug, the electrical outlet may become abnormally heated, leading to an unexpected disaster such as a fire.

[Purpose of the invention] The present invention was achieved as a result of studies to solve the above-mentioned problems.

Therefore, an object of the present invention is to provide a safe electrical outlet that can reliably detect abnormally high temperatures and prevent accidents such as fire outbreaks.

[Structure of the invention] In other words, the invention has a plug-in fitting receiving part of the plug,
A driving member using a spring that can forcibly remove the plug from the outlet is provided, and a control member using a shape memory alloy that senses a temperature rise and changes its shape between the driving member and the current supply section. In the outlet provided with this, the spring is housed inside the lower part of the piston having an engaging protrusion on the periphery of the central portion, and the piston is biased upward to serve as a driving member;
On the other hand, the shape has an engaging part that engages with the engaging protrusion at the upper end, a drive control rod that rotates around a pivot shaft, and at least a bent part that connects one end of the drive control rod and the fixed holder. The gist of the present invention is an electrical outlet characterized by using a memory alloy as a control member.

[Description of Embodiments] The present invention will be specifically described below using embodiments with reference to the drawings.

1 and 2 show an electrical outlet according to an embodiment of the present invention, FIG. FIG. 2 is an explanatory longitudinal cross-sectional view of a state in which an abnormally high temperature is sensed and the supply of current is cut off.

As is clear from the drawings, the outlet of the present invention has a current supply part 2 and a plug socket 3 built into the case 1, and the plug socket 3
A drive member A based on a spring 4, typically a coil spring, is located at the position , and a control member B based on a spring 8 made of a shape memory alloy is located between the drive member A and the current supply section 2. is provided.

Here, the driving member A includes a spring 4 having a restoring ability sufficient to push up the connected plug from the outlet, a piston 5 whose one end is connected to the spring 4 and has an engaging protrusion 6 approximately in its center, and a compressor. It consists of a spring 4 and a cap 7 that can accommodate the portion of the piston 5 below the engagement protrusion 6. When the outlet is in normal use, the piston 5 is pushed downward as shown in Figure 1. It's lowered.

The control member B includes a spring 8 made of a shape memory alloy, a drive control rod 12 that has an engagement portion 9 at its upper end, rotates about a pivot shaft 11, and a holder 10, and The portion 9 can be freely disengaged from the engagement protrusion 6, and one end of the shape memory alloy spring 8 is attached to the lower end of the drive control rod 12, and the other end is attached to the holder 10. In normal use, as shown in FIG. 1, the piston 5 of the driving member A
The engaging portion 9 is engaged with the engaging protrusion 6 of the piston 5 so that the engaging portion 9 is in a depressed state.

The shape memory alloy used in the control member B of the present invention is an alloy that exhibits so-called thermoelastic martensitic transformation, that is, an alloy that has a shape memory effect that returns to its original shape when heated even if it is deformed in the martensitic phase state. It is.

The spring 8 in the control member B of the present invention is formed by forming the above-mentioned shape memory alloy into a coil spring shape, and the connected engagement portion 9 is connected to the engagement protrusion 6 of the piston 5 in a normally martensitic phase state. By engaging, the piston 5 is held so as to be pushed down and stored inside the outlet, and when a high temperature due to abnormal heating is detected, it undergoes reverse transformation and expands.
It acts to forcefully release the engagement between the engagement portion 9 and the engagement protrusion 6.

Therefore, the spring 8 in the control member B is preliminarily memorized to have a shape that extends sufficiently to ensure that the engaging portion 9 is disengaged from the engaging protrusion 6 when a rise in temperature is detected.

During normal use, the electrical outlet of this invention
As shown in the figure, the engaging protrusion 6 of the piston 5 of the driving member A and the engaging part 9 of the drive control rod 12 of the control member B are engaged, and the lower half of the piston 5 of the driving member A is inside the cap 7. It is loaded and completely housed inside the outlet.

When an abnormally high temperature is detected in this state, the spring 8 of the control member B undergoes transformation and stretches as shown in Fig. 2, and the engaging portion 9 disengages from the engaging protrusion 6, thereby cutting off the supply of current to the plug. At the same time, the piston 5 of the driving member A is pushed upward by the restoring force of the spring 4 and protrudes from the outlet, and is used to forcibly remove the plug (not shown) from the outlet.

Further, the drive control rod 12 in the present invention rotates around the pivot shaft 11 and disengages the engagement protrusion 6 and the engagement portion 9 based on the lever principle. By changing the position of the support shaft 11, it is possible to correspond to the amount of deformation of the shape memory alloy spring 8. In other words, in the embodiment shown in FIGS. 1 and 2, the pivot shaft 11 is located approximately at the center of the drive control rod 12, but if this is moved further downward, the shape memory alloy spring 8 will be slightly The engagement is released only by deformation. However, at that time, the deformation force is required more than the amount of deformation of the spring 8, so the balance depends on the composition of the shape memory alloy, the shape of the spring, the thickness of the spring wire, and the relationship between the engagement protrusion and the engagement part. Although it is necessary to select appropriate values depending on the shape, etc., by appropriately adjusting these values, it is possible to detect a slight abnormal heat and improve the sensing accuracy.

Therefore, according to the outlet of the present invention, when an abnormally high temperature occurs, the plug can be automatically removed from the outlet, and accidents such as fire can be reliably prevented.

In addition, if you want to use an outlet that has detected abnormally high temperature and automatically removed the plug, wait until the outlet has cooled down sufficiently and the shape memory alloy spring 8 has contracted, and then pull the piston 5 by hand or By pushing the plug into the outlet and hooking the engagement portion 9 of the control member B to the engagement protrusion 6 of the drive member A, the piston 5 may be built into the outlet again. In this embodiment, the drive control rod 12 is bent in a dogleg shape, the engaging portion 9 is claw-shaped, and the shape memory alloy is shaped like a spring, but the drive control rod 12 is straight. It may be the rod of
The engaging portion 9 may be U-shaped, and the shape memory alloy may have any shape as long as it has at least a bent portion and its length expands when deformed at high temperatures. You can.

[Effects of the invention] As described above, the present invention provides a driving member using a spring in the insertion metal receiving part of the plug, which can forcibly detach the plug from the outlet, and also connects the driving member with the current supply. A control member made of a shape memory alloy that can sense a temperature rise and start driving the drive member is provided between the parts, so that the following effects are achieved. That is, (1) it is safe because it can reliably prevent fires from occurring due to overheating when excessive current flows through the outlet or poor contact occurs;

(2) As a means of detecting abnormally high temperatures and detaching the plug, we use not only the deformation of the shape memory alloy, but also a lever (drive control rod) that doubles the force, dramatically improving high temperature sensing accuracy. can be improved.

(3) An outlet whose plug has been removed due to abnormally high temperature can be easily reused by pushing the piston protruding from the outlet into the outlet by hand or with the plug after it has cooled down sufficiently. can be restored to.

(4) Since the outlet is equipped with a safety device consisting of a driving member and a control member, it can be used with any existing electrical product.

[Brief explanation of the drawing]

Figures 1 and 2 show an electrical outlet according to an embodiment of the present invention, Figure 1a is a longitudinal cross-sectional view of the state in normal use, and Figure 1b is a cross-sectional view taken along the line A-A' of the same. 2 are longitudinal cross-sectional explanatory views of a state in which abnormally high temperature is detected and the supply of current is cut off, and FIGS. 3a and 3 b are longitudinal cross-sectional explanatory views of a conventional electrical outlet, respectively. 2... Current supply part, 3... Plug fitting receiving part, A... Drive member, 4... Spring, 5... Piston, B... Control member, 8... Spring made of shape memory alloy.

Claims (1)

[Scope of utility model registration request] A driving member using a spring is provided in the insertion metal receiving part of the plug to forcibly remove the plug from the outlet, and a spring-based driving member is provided between the driving member and the current supply part to sense a temperature rise and change the shape. In an outlet provided with a control member using a shape memory alloy that changes the temperature, the spring is housed inside the lower part of a piston having an engaging protrusion on the periphery of the central part, and the piston is biased upward to act as a driving member; A shape memory alloy having an engagement part on the upper end that engages with the engagement protrusion, a drive control rod that rotates about a pivot shaft, and at least a bent part that connects one end of the drive control rod and the fixed holder. An electrical outlet characterized by having a control member as a control member.