JPH028344Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a case structure for a changeover switch used in a changeover switch that can adjust the temperature of an electric heater in stages. In the case structure of a conventional changeover switch, as shown in FIG.
was rotatably mounted in the case 1a, and by rotating the handle body 6a, a changeover switch was operated to adjust the temperature of the electric heater. However, in such a case, in order to enable the handle body 6a to be operated from the outside, the handle body 6a is
Since a part of the handle body 6a was simply protruded from the hole 8a of the case 1a, it was easy for dirt to enter the case through the gap between the handle body 6a and the hole 8a of the case 1a, and the handle body 6a was housed in the case 1a. This was causing the changeover switch to malfunction. Reference numeral 9 denotes a temperature display window that indicates the strength and weakness of the temperature of the electric heater. However, as seen in Japanese Utility Model Application Publication No. 55-75029, etc., by fitting the handle body onto the operating stick of the switch and covering the elongated hole formed in the switch housing with a flange piece provided on the handle body, , attempts are being made to solve this problem. However, if this configuration is applied to an off-the-shelf switch, the on/off state display part provided on the switch may be hidden by the handle body, making it difficult to know the setting state of the switch, resulting in a problem of poor usability. . This problem becomes particularly noticeable in a changeover switch that performs switching in multiple stages. On the other hand, the switch is housed in a case, and the display characters corresponding to the setting status of the switch are written on the collar piece formed on the handle body provided on the operation stick of the switch, and the display characters are written through a window provided in the case. The configuration in which only one part is exposed was developed in the 1970s.
It is disclosed in Publication No. 127659, etc. However, in order to house the switch in a case separate from the switch and to match the settings of the switch with the display characters exposed through the window, consideration must be given to the positioning of the case and the switch. However, conventional switches have not taken this point into consideration. The present invention has been developed in view of the above-mentioned problems, and is designed to prevent dirt from entering the case in which the changeover switch is housed, and to display the setting status of the changeover switch for easy operation. To provide a case structure for a changeover switch which does not interfere with performance and allows the set state of the changeover switch and the display of the set state to be easily and reliably matched during assembly. Hereinafter, the present invention will be explained in detail based on examples. A
is a changeover switch housed in the case 1, which allows you to adjust the temperature of an electric heater such as a kotatsu by switching between four levels: "strong,""medium,""weak," and "off." , is composed of a switch body 10, two pairs of terminal plates 11, a contact spring 12, an operating body 13, and a switch cover 14, and the operating body 13 is slid in the front-rear direction on an operating rod 5 protruding from the operating body 13. By making Switch Body 10
The operating body 13 is locked in stages by the coil spring 16 and the steel ball 17 in the group of wavy locking parts 15, and the terminal plate 11 and the contact spring 12 form four types of open/closed states of the contacts, which generate electric heat. This allows the temperature of the container to be adjusted. In other words, the steel balls 17 are attached to the locking portions 15 at four locations.
By switching and locking the operation body 13, the position of the operation body 13 changes to four positions, whereby the contact springs 12 on both sides are turned on and off separately by the cam portions 20 on both sides of the operation body 13, and the operation body 13 is switched to four positions. It is now possible to switch between. Figure 6 shows a circuit diagram of an electric heater, in which two heaters H ₁ and H ₂ with different resistances are connected.
Electricity can be supplied by switching between the two switch sections SW ₁ and SW ₂ . The switch parts SW ₁ and SW ₂ are composed of the two pairs of terminal plates 11 and contact springs 12 on both sides. E is a power source. Then, by operating the operation stick 5, the position of the operation body 13 is changed to four positions, and as shown in the table below, the switch part SW ₁ ,
SW ₂ turns on and off to allow four-stage switching. In this table, action 1 is in the "off" state, action 2 is in the "weak" state, action 3 is in the "medium" state, and action 4 is in the "strong" state.

[Table] As described above, the operating rod 5 protrudes from the upper surface of the switch housing formed by the switch body 10 and the switch cover 14. A case 1 that houses the changeover switch A includes an upper case 2 and a lower case 3 that are vertically divided into two parts, and a handle body 6 that interlocks the operation stick 5 of the changeover switch A.
The bottom of the lower case 3 is provided with a shallow fitting recess 4 into which the lower part of the changeover switch A is fitted, so that the changeover switch A can be positioned within the case 1. A handle body 6 is attached to the operation stick 5 projecting from the top of the changeover switch A by a fitting method or the like, and a collar piece 7 is horizontally extended from the entire circumference of the handle body 6. At the end of this flange piece 7, "strong" and "medium" are marked to indicate the temperature adjustment stage in the front and back direction.
Marks 18 such as "weak" and "off" are printed, and the upper case 2 has an elongated hole 8 that is long in the front-rear direction to allow the handle body 6 to protrude outside and to move the handle body 6 in the front-rear direction. When the upper case 2 is attached to the lower case 3 with the combination screws 19, the collar piece 7 of the handle body 6 is slidably in close contact with the inner surface of the upper case 2. The flange piece 7 of the handle body 6 is formed sufficiently larger than the elongated hole 8 of the upper case 2, so that no gap is created between the elongated hole 8 and the flange piece 7 even when the handle body 6 moves back and forth. The upper case 2 has a long hole 8.
Separately, a window 9 for temperature display is perforated, and in accordance with the switching stage of the changeover switch A, the flange piece 7 can be set to "strong", "medium", "weak", or "off".
The size of the window 9 for temperature display is approximately the same as that of each mark 18. Therefore, even if the handle body 6 is moved in the front-rear direction and the operation stick 5 of the changeover switch A is linked, the handle body 6 and the elongated hole 8 of the case 1 are connected to the flange piece 7.
Due to the presence of the case 1, there is no gap and dirt is prevented from entering the case 1. As described above, the present invention includes a changeover switch that switches multiple contacts by sliding an operation stick protruding from one side of the switch case, a case in which the switch case is housed, and a case that fits into the operation stick of the changeover switch. The case is formed by combining an upper case and a lower case, which are halves, and a part of the switch housing on the opposite side of the operating stick fits into the inner bottom surface of the lower case. A fitting recess is formed in the upper case, and a long hole is formed in the upper case to allow a part of the handle body to protrude so that the handle body can be slid in the sliding direction of the operation stick. A collar piece that closes the long hole over the entire range of movement of the handle body is extended in close contact with the inner peripheral surface, and a mark corresponding to the number of switching stages of the changeover switch is written on the surface of the collar piece. A window is formed on the side edge of the hole to expose only one of the markings, and the elongated hole formed in the case for protruding the handle body extends over the entire operating range of the handle body. Since it is covered with a flange piece formed on the body and the flange piece is in close contact with the inner circumferential surface of the upper case, dirt will not enter into the case through the elongated hole. In addition, marks are written on the collar piece formed on the handle body according to the number of stages of the changeover switch, and a window is formed on the side edge of the elongated hole for protruding the handle body to expose one of the marks. Although the handle body is provided to prevent the switch from entering the case, the setting state of the changeover switch can be easily checked visually. Furthermore, since the change-over switch is housed inside the case, it is possible to obtain a change-over switch with a dust-proof structure simply by installing a conventionally-used off-the-shelf changeover switch in the case.
Since a portion of the changeover switch is fitted into a fitting recess provided on the inner bottom surface of the lower case, positioning of the changeover switch is facilitated.
As a result of the changeover switch being housed in a fixed position within the case and the handle body being fitted onto the switch's operating stick, the positional relationship between the changeover switch, the case and the handle body can be easily and easily maintained without any misalignment. This has the advantage that it can be determined reliably. In other words, if each component is placed in a predetermined place and assembled in order, the setting state of the changeover switch can be determined.
This has the advantage that the correspondence with the mark exposed through the window is automatically determined.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional example, Fig. 2 is an exploded perspective view of an embodiment of the present invention, Fig. 3 is an exploded perspective view of the changeover switch of the same type, and Fig. 4 a, b, and c are plan views of the same. , a notched side view and a front view, FIG. 5 is a bottom view of the same as above with the lower case removed, and FIG. 6 is a circuit diagram of the same as above electric heater, A is a changeover switch
1 is a case, 2 is an upper case, 3 is a lower case, 4 is a fitting recess, 5 is an operating stick, 6 is a handle body, 7 is a flange piece, 8 is a long hole, 9 is a window, and 18 is a mark .

Claims (1)

[Scope of utility model registration request] A changeover switch that switches multiple contacts by sliding an operation stick protruding from one side of the switch case, and a case in which the switch case is housed;
The case is formed by combining an upper case and a lower case, which are halves, and the inner bottom surface of the lower case has a handle body that fits into the operation rod of the switch housing. A fitting recess into which a part of the opposite side fits is formed, and a long hole is formed in the upper case from which a part of the handle body protrudes so that the handle body can be slid in the sliding direction of the operation stick. The handle body has a collar piece extending in close contact with the inner peripheral surface of the upper case to close the elongated hole over the entire range of movement of the handle body, and a collar piece is provided on the surface of the collar piece that corresponds to the number of switching stages of the changeover switch. A case structure of a changeover switch, in which a corresponding mark is written and a window is formed on the side edge of a long hole to expose only one of the marks.