JPH0241810Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a setter mounting device that is attached to a dial that is driven to rotate at a slow speed in a dial timer, and that drives a contact section via a cam by the rotation of the dial. be.

[Background Art] For dial-type timers whose on/off settings are frequently changed, a setter is usually inserted into a hole in the dial, but for dial timers whose on/off settings are rarely changed, For devices that are frequently turned on and off, it is preferable to have a setting element that is unlikely to fall off the dial. In the latter type of dial timer, the setting plate was conventionally held between the mounting plate and the dial by screwing a metal mounting plate to the dial. When mounting in this way, the screw holes in the dial often get crushed because the dial is usually made of synthetic resin, and there is not enough space on the dial to secure the screws. There are limits to how small the dial can be made.

[Purpose of the invention] The present invention was devised in view of the above points, and its purpose is to create a dial type that allows the setting element to be securely attached to the dial and also contributes to the miniaturization of the dial. To provide a timer setter mounting device.

[Disclosure of the invention] Accordingly, the present invention provides a dial having a shaft portion and an engaged portion, a setter having a ring portion rotatably fitted to the shaft portion of the dial, and a setter formed on the dial. The device is characterized in that it comprises a ring-shaped mounting plate as a molded product which is provided with means for engaging with the engaged portion of the setter and clamps the ring portion of the setter between it and the dial. The setter is held on the dial by attaching the ring-shaped attachment plate to the dial by engaging the means and the engaged portion. Here, the engagement between the engagement means of the mounting plate and the engaged part of the dial may take any form, but when the setter drives the contact part via the cam, Preferably, the applied loads do not cause the mounting plate to disengage the dial. In other words, the direction in which the load is applied should not coincide with the direction in which the engagement is released. Most preferably, the direction in which the load is applied is the direction in which the engagement between the engaging means and the engaged portion becomes deeper.

The present invention will be described in detail below based on the illustrated embodiment. As shown in FIG. 7, the timer is constructed of a mechanical case in which a lower motor 8, an upper contact switching section, a speed reduction mechanism, etc. are housed. 9
, a dial 1 attached to a shaft protruding from the mechanism case 9, an ON setting element 21 and an OFF setting element 22 attached to the dial 1, a cam 4 driven by these setting elements 21 and 22, etc. has been done. Setters 21 and 22 rotate together with the dial 1 which is driven to rotate at a very low speed by the output of the motor 8.
moves the cam 4, and a switching cam inside the mechanism case 9 that rotates in conjunction with the cam 4 drives the contact portion to perform on/off switching.

Now, the disc-shaped dial 1 has a shaft part 10 protruding downward, and serrated engagement grooves 11 are arranged in rows on the lower surface of the periphery. An engaged hole 13 that vertically penetrates the
A plurality of engaged portions 12 are arranged at intervals in the circumferential direction, and each of the engaged portions 12 includes an arc-shaped hole 14 formed in a circumferentially long arc shape on the upper surface of the disc portion and one end of which is continuous to the upper portion of the engaged hole 13. There are several. Further, a plurality of protrusions 15 are provided at intervals on the outer circumferential surface of the lower end of the shaft portion 10 in which a shaft hole penetrating in the axial direction is formed, projecting in the outer circumferential direction.

Both the ON setting element 21 and the OFF setting element 22 include a ring part 23 that is rotatably fitted onto the outer periphery of the shaft part 10 of the dial 1, an index part 24 that also serves as a knob when rotating, and a cam 4. and a feed pawl 25 that engages with the feed pawl 25. In addition, the ON setting element 2
1 and the off setter 22, the positions of the feed claws 25 are different, and each engages with a different cam portion of the cam 4 to feed the cam 4.

The ring-shaped mounting plate 3 is also fitted onto the outer periphery of the shaft portion 10 of the dial 1, and has a plurality of L-shaped protrusions 31 rising up at intervals in the circumferential direction. Further, the central shaft hole is provided with notches 32 extending in the outer circumferential direction at intervals.

On the other hand, the shaft 5 to which the dial 1 is attached is the first
As is clear from the figure, a plurality of grooves 51 are provided on the outer peripheral surface of the distal end at intervals in the circumferential direction, and a plurality of engaging protrusions 52 whose distal ends extend outward from the bottom surface of the grooves 51 are provided. This has now been extended.

However, in this lever, both setters 21,
22 are fitted onto the outer periphery of the shaft 10 of the dial 1, and the mounting plate 3 is fitted onto the outer periphery of the shaft 10 from below.
The mounting plate 3 is inserted through the inside of the ring portion 23 of 22.
Insert the protrusion 31 rising from below into the engaged hole 13 in the engaged portion 12 of the dial 1,
Next, by rotating the mounting plate 3 or the dial 1, the tip of the protrusion 31 is aligned with the arcuate hole 14.
It moves inside. By this, both setters 2
The ring portions 23 of Nos. 1 and 22 are both held between the dial 1 and the mounting plate 3. At this time, the setter 21 and dial 1 are still set.
The on/off settings can be changed by rotating the dial 22, and the rotation of the setting elements 21 and 22 is prevented by inserting each setting element into the engagement groove 11 formed on the lower surface of the periphery of the dial 1. This is done by engaging the engaging claws 26 protruding from the upper surfaces of the indicators 21 and 22 near the index portions 24. Further, the direction of engagement between the protrusion 31 and the engaged portion 12 is the same as the direction of the load that the setters 21 and 22 receive from the cam 4. Together with the setter 22 that is in contact with the mounting plate 3,
If the mounting plate 3 moves, the engagement between the mounting plate 3 and the dial 1 will not loosen, but on the contrary, the engagement between the mounting plate 3 and the dial 1 will deepen. Furthermore, the protrusion 31 and the arcuate hole 14 of the engaged portion 12 are provided with a recess 39 and a protrusion 16, as shown in FIG. 2, so that they engage elastically. There is. Furthermore, attach the mounting plate 3 to the shaft part 1 of the dial 1.
0. When fitting it to the outer circumference, use the mounting plate 3.
The protrusion 15 protruding from the shaft portion 10 passes through the notch 32, and
Rotate the mounting plate 3 relative to the dial 1,
When the projection 31 serving as the engagement means is engaged with the engaged portion 12 of the dial 1, the projection 15 is brought into contact with the lower surface of the mounting plate 3, as shown in FIG. ing.

To attach the dial 1 with the setters 21 and 22 assembled to the shaft 5 as described above, insert the tip of the shaft 5 into the shaft hole penetrating the dial 1, and then insert the engaging protrusion 52 of the shaft 5 into the dial 1. This is done by locking it to the stepped surface at the top of the shaft hole. Since the inner surface of the lower end of the shaft hole of the dial 1 is provided with a protrusion 17 that is engaged with the groove 51 on the outer periphery of the shaft 5, there will be no slippage between the shaft 5 and the dial 1. . Also, at the upper end of the shaft hole of dial 1, dial 1
There is a pin 18 formed integrally with the shaft 5, and by press-fitting the pin 18 supported by this thin crosspiece 19 into the hole in the tip surface of the shaft 5 as shown in FIG.
The engagement protrusion 52 of the shaft 5 is expanded around the outer periphery and is securely engaged with the stepped surface. This improves the strength of preventing the dial 1 from coming off, and since the pin 18 serving as the means for preventing it from coming off is formed integrally with the dial 1, no separate parts are required. Note that the crosspiece 19 connecting this pin 18 to the dial 1 is the shaft 5 in the one shown in FIG.
It is assumed that it will break when it is press-fitted into the
Even in this state, the pin 18 and the dial 1 may be connected. Further, if the pin 18 is provided with a notch into which the tip of a tool such as a screwdriver can be inserted, it will be easier to remove the pin 18 when it is necessary. Further, a nameplate 6 with a time limit scale and the like is attached to the upper surface of the dial 1.

Next, the procedure for changing the on/off setting will be explained. As shown in FIG. , by rotating the setters 21 and 22 in this state. The bases of the indicator portions 24 in the setters 21 and 22 are formed into hinge portions 27 which are made thin and have elasticity. When the indicator portions 24 are pushed down, the hinge portions 27 are bent, and the connection from the engagement groove 11 is bent. This allows the engagement claw 26 to disengage. Then, when you release your finger from the indicator part 24, the elasticity of the hinge part 27 causes the indicator part 24 to
4 returns, and the engagement claw 26 re-engages with the engagement groove 11. The force pushing down the index portion 24 is generated by the hinge portion 27
, and is not transmitted to the feed pawl 25. Therefore, when changing the on/off setting, the feed pawl 25 falls inward and passes through the engagement position with the cam 4 without engaging with the cam 4. , both cam parts of the cam 4, the ON setter 21 and the OFF setter 22
There is no possibility that the order of engagement with each of the feed pawls 25 will be messed up. The hinge portion 27 may be formed using a leaf spring, as shown in FIG. 10.

[Effect of the invention] As described above, in the present invention, by engaging the engagement means formed on the ring-shaped mounting plate as a molded product with the engaged portion provided on the dial, the mounting plate and the dial can be connected. The ring part of the setting element is held between the holes, which prevents the screw holes from being crushed as would be the case when screwing the mounting plate to the dial, making it easier to attach the setting element. is easy, and
It can be installed reliably, and it can also be made lightweight and small.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of one embodiment of the present invention, Figs. 2 and 3 are sectional views of the engagement portion between the dial and the mounting plate, Fig. 4 is a bottom view of the above, and Figs. Figure 6 is a cross-sectional view of the state in which it is attached to the same shaft as above;
FIG. 7 is a perspective view of the entire timer same as above, FIGS. 8 and 9 are front views same as above, and FIG. 10 is a perspective view showing another example of the setting device, where 1 is a dial and 3 is a mounting plate. , 12 is an engaged portion, 21 and 22 are setters, 23 is a ring portion, and 31 is a projection as an engaging means.

Claims (1)

[Scope of utility model registration request] A dial having a shaft portion and an engaged portion, a setter having a ring portion rotatably fitted to the shaft portion of the dial, and means for engaging the engaged portion formed on the dial. A setter mounting device for a dial type timer, comprising a ring-shaped mounting plate as a molded product that holds a ring portion of the setter between the dial and the dial.