JPS6037792Y2 - time switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a time switch for electric appliances such as electric ovens and toaster ovens.

The purpose of this is to prevent the lubricating oil applied to the main body of the time switch from adhering to the switch for turning the power on and off.

Conventionally, as shown in FIGS. 1, 2, and 3, the switch body 9 of a time switch has a timer body 1 having a clock mechanism, a switch box 4 made of an insulating material such as phenol, and a contact 7. , 8, and the switch box cover 1 is attached.
5 and fixed with screws 17 and 17',
At this time, the contact surfaces of the switch box 4 and the switch box cover 15 were in close contact.

Further, the screw 17 passes through a screw attachment hole provided in the switch box and is attached to a screw hole provided at the end of a support column that fixes the base plate of the timer main body 1 by caulking or the like.

Because of this structure, the lubricant for the gears in the timer main body 1 oozes out to the outside of the main plate through the gear support holes provided in the main plate, and then passes through the gap between this main plate and the switch box 4. It penetrates into the mounting part of the screw 17 by capillary action, passes through the gap between the screw 17 and the through hole provided in the switch box 4, and then passes through the gap between the switch box 4 and the switch box cover 15. oozes out by capillary action.

It also adhered to the contacts of the switch, causing poor conduction and overheating of the contacts.

Therefore, the present invention aims to improve the above-mentioned drawbacks and provide a highly reliable time switch with fewer failures.

An embodiment of the present invention will be described below with reference to the drawings.

4 and 5, 1 is a timer body having a clock mechanism, 2 is a cam for operating a switch in conjunction with the timer mechanism, and 3 is provided in a switch box 4, which will be described later, in contact with the cam. A switch pressing piece made of an insulating material that slides back and forth along a groove and engages with the movable side contact piece 5 to press the movable side contact piece 5. Reference numeral 6 is a fixed side contact piece; Contacts 7 and 8 are attached to the contact piece 5 and the fixed side contact piece 6.

The switch box 4 has the movable contact piece 5 and the fixed contact piece 6.
A groove for holding the movable part and a recess for housing the movable part and the contact are provided, and as shown in FIG. .

Further, screw through holes 12.12' are provided on both sides of the switch box 4 or at appropriate positions, and a suitable counterbore 10.
11 will be provided.

Reference numeral 15 denotes a switch box having a flat plate shape and having mounting holes 13 and 14 at positions corresponding to the holes 12 and 12' of the switch box 4 to prevent dust and the like from adhering to the switch body 9. It's a cover.

Further, the switch box 4 and the switch box cover 15 are fixed to the timer main body 1 with screws 16 and 16'.

The present invention has the structure as described above, and as shown in FIG. 6, the lubricating oil used in the timer body 1 has a counterbore 10.11, so that it is not sucked up by capillary action, and therefore, the lubricating oil used in the timer main body 1 is prevented from being sucked up by the screw 16. 16' and the hole 12. Furthermore, the switch box 4 and the switch box cover 1
Lubricating oil enters the gap between the contact point 5 and the contact point 7, 8, etc.
There is no risk of poor contact or overheating of the contacts.

As explained above, according to the present invention, it is possible to provide a time switch with a simple structure and high reliability.

In addition, the present invention has a counterbore 18.1B as shown in Fig. 7.
The same effect can be obtained by changing the shape of ' or by changing the position of the counterbore.

[Brief explanation of drawings]

Fig. 1: External view of the time switch; Fig. 2: Structural diagram of the conventional time switch with the switch box cover removed; Fig. 3: A sectional view of the main parts of the same; Fig. 4: The time switch of the present invention. Fig. 5 is an exploded perspective view of the main part of the same, Fig. 6 is a sectional view of the main part of the same,
FIG. 7 is a sectional view of main parts showing another embodiment of the present invention. 1...Timer body, 2...Cam, 3
...Switch pressing piece, 4...Switch box, 5...Movable contact piece, 6...Fixed contact piece, 7, 8...・Contact, 9... Switch body, 10, 11... Counterbore, 12゜12
'... Hole, 13, 14... Mounting hole, 1
5...Switch box cover, 16, 16'
······screw.

Claims (1)

[Scope of utility model registration request] When a time switch is composed of a clock mechanism, a cam plate rotated by the clock mechanism, a switch pressing piece that comes into contact with the cam surface of the cam plate and moves up and down, and a switch that is opened and closed by the pressing piece, it is a switch. In a time switch in which the switch box is housed in a switch box and the switch box is attached to a clock mechanism with screws, a counterbore is formed in a part of the screw through hole of the switch box to the extent that capillary phenomenon does not occur when the screw is passed through. A time switch characterized by: