JPS5844393Y2 - Ratchet knob - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a knob that is particularly suitable for adjusting the time and timer set used in flap-type digital watches.

When the above-mentioned knob is rotated, it transmits the force of the internal mechanism in one direction, and when rotated in the opposite direction, the internal mechanism does not operate, so it is desirable that only the knob rotates idly. Doing so may cause malfunctions such as damage to the internal mechanism.

In view of the above, the present invention provides a knob □ whose structure is extremely simple and easy to assemble.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

First, the first embodiment of the present invention will be explained with reference to FIGS. 1 to 4, then the second embodiment of the present invention will be explained with reference to FIGS. 5 to 8, and finally the ninth embodiment of the present invention will be explained. A third embodiment of the present invention will be explained with reference to FIGS. 12 to 12, and a fourth and fifth embodiment of the present invention will be explained with reference to FIGS. 13 and 14.

First, to explain the first embodiment, Figs.
In the figure, 1 is a knob 1a, a hollow cylindrical holder 1
(b) A knob body formed by cutting and bending the end of the holder 1b and integrally forming a ratchet claw (1c) with spring properties; (1) a knob body formed by molding a flexible plastic; An L-shaped groove 2a formed into an L-shape by milling or the like, a taper 2b formed at the end, a body 2c, and is connected to a device such as a clock (not shown) having a diameter larger than the body 2c. shaft 2
f, a shaft having a stepped portion 2g formed between the shaft 2f and the body portion 2c.

Since the knob body 1 and the shaft 2 are formed as described above, when assembling the two, it is important to be aware of the relative positional relationship between the ratchet pawl 1c of the knob body 1 and the L-shaped groove 2a of the shaft 2. Simply insert the taper 2b into the knob body 1.

As a result, the ratchet pawl 1c first tapers 2b.
When the ratchet pawl 1c and the edge connected thereto are restrained by the stepped portion 2g, when the ratchet pawl 1c and the edge portion connected thereto are restrained by the stepped portion 2g,
It won't be pushed any further.

If you wish to pull out the knob body 1 from the shaft 2, you can simply pull the knob body 1.

As a result, the ratchet pawl 1c is pressed against the body 2d against the frictional resistance, or the ratchet pawl 1c
When it is in contact with the JZL-shaped groove 2a, it can be pulled out against the resistance of climbing the slope at the end.

Therefore, by appropriately setting the strength of the springiness of the ratchet claw 1c, it is possible to prevent the knob body from falling off due to vibrations, etc., and also to easily remove it if necessary.

If the knob body 1 described above is inserted into the shaft 2 and the knob 1a is pinched and turned in this state, if the direction is in the direction of arrow B as shown in FIG. 2a, the shaft 2 rotates integrally with the knob body 1, and as shown in FIG. 4, by turning the knob 1a in the direction of the arrow, the ratchet pawl 1c escapes from the L-shaped groove 2a. As a result, the shaft 2 does not rotate and only the knob body 1 rotates idly.

In the above, the ratchet pawl 1c is formed integrally with the knob body 1;
Since the material is limited to those having spring properties, the ratchet pawl may be made of a material different from that of the knob body.

This will be explained below as second and third embodiments.

First, the second embodiment of the present invention will be described with reference to FIGS. 5 to 8, but without repeating the explanation of the first embodiment described above. A slit 3c and a slit 3d are formed, and a ratchet claw 4 made of a resilient material such as polished band steel or phosphor bronze is inserted into the slit 3c and held as shown in FIGS. 6 to 8. .

Insert the ratchet main body 1 equipped with the ratchet pawl 4 into the shaft 2 shown in FIG. 2, as shown in FIG. 7,
In this state, when the knob body 3 is turned in the direction of arrow F, the shaft 2 is also rotated integrally in the direction of arrow G through the engagement between the ratchet pawl 4 and the L-shaped groove 2a.

Conversely, when the knob body 3 is turned in the direction of arrow H as shown in Fig. 8, the ratchet pawl 4 is pushed up from the L-shaped groove 2a and comes into contact with the outer circumference of the shaft 2 inside the ratchet 3d. 1 is disconnected from shaft 2 and rotates idly without rotating shaft 2.

The second embodiment of the present invention, in which the knob body and the ratchet claw as described above are constructed separately, will be described as a third embodiment, as shown in FIGS. 9 to 12. The claw can be held in two places by the main body of the claw, making it possible to hold it more securely.

The third embodiment will be described below without repeating the description of the second embodiment. In FIGS. 9 to 12, the knob body 5 is provided with two slits 5c and 5d.

On the other hand, the ratchet claw 6 is the claw 6 a s slit 5 c
, 5d, the ends 6b, 6c, this end 6b,
Arms 6d and 6e that are curved in an arc shape connecting the slits 5c and 6c are integrally formed of a spring material, and the slits 5c and 5d
Press-fit the ends 6b and 6c into.

In this case, the ratchet pawl 6 has its arms 6 d , 6
It is also possible to eliminate one of the arms e and leave only one arm; in this case, the shape will be like a ratchet pawl 6'.

Hereinafter, the assembly and operation thereof are the same as in the case of the second embodiment described above, so a description thereof will be omitted.

Next, a fourth embodiment will be explained with reference to FIG. 13.

FIG. 13 shows a shaft 2-2, which has a partially different shape from the shaft 2 shown in FIG.

This shaft 2-2 consists of an L-shaped groove 2-2a, a taper 2-2b, a body 2-2c, a groove 2-2h, and a spring ring 2-2g attached thereto. 2h, it acts as a stopper for the knob body 1 in the same way as the stopper 2g for the shaft 2 in FIG. 2, and a material with the same thickness as the body 2c can be used.

FIG. 14 shows a shaft 3-2 that is partially different from the shaft 2 shown in FIG. 2.

This shaft 3-2 has an L-shaped groove 3-2a, a taper 3-2b, a body portion 3-2c, a groove 3-2d, a stopper 3-2e having a slope of an angle θ, and a stopper 3-2f. Groove 3
-2d is a width slightly wider than the length in the axial direction of the ratchet pawl 1c of the knob body 1 shown in FIG.
When it is attached to the camera, it falls into this □zo 3-2d and is held there.

Therefore, when pulling out the knob body 1 from the shaft 3-2, when the knob □ body 1 is pulled, the force required for the ratchet pawl IC to climb the slope of the angle θ provided on the stepped portion 2e acts as resistance. By pulling further, the ratchet pawl IC slides on the body portion 2c and can be pulled out from the shaft 2.

Therefore, by appropriately setting the size of the angle θ, the height of the stepped portion 2e, or the strength of the ratchet claw 1C in advance, it is possible to prevent the knob body 1 from coming off without permission due to vibration, etc. You can also pull it out.

According to the present invention, the knob body 1°3.5 and the ratchet pawl are integrally constructed as described above, and the shaft 2 is machined by an extremely simple one-step cutting process using an automatic machine or the like. Since it is a ratchet mechanism that only performs processing, the number of parts and processing steps are small, and the structure is simple.
It can be implemented at low cost and has extremely high economic effects.

According to the present invention, as described above, the ratchet pawl is constructed integrally with the knob bodies L3, 5, whereas the shaft 2
Since there is no protruding part and the mechanism is simply provided with one notch, it has an extremely compact structure and has the advantage of being extremely easy to downsize as required.

According to the present invention, when assembling, there is no need to consider the orientation of the ratchet pawl on the knob body and the orientation of the L-shaped groove 2a on the shaft 2, and it is only necessary to insert the knob. The effect is easy to assemble.

According to the present invention, when removing the knob body from the shaft 2, you will feel some resistance for a moment, and then you can easily pull it out, and it is stable and cannot be pulled out automatically due to vibration or other reasons. This has the effect of maintaining a certain level of retention.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a knob body 1 according to a first embodiment of the present invention, Fig. 2 is a perspective view of a shaft 2 inserted into the knob body 1, and Fig. 3 is a section taken along arrow A-A in Fig. 1. FIG. 4 is an explanatory diagram showing the idling operating state of FIG. 3, and FIG. 5 is an exploded perspective view of the knob body 3 and ratchet pawl 4 of the second embodiment of the present invention. , Figure 6 shows the knob body 3.
and a perspective view showing the assembled state of the ratchet pawl 40, FIG. 7 is a cross-sectional view of the assembled state taken along arrow E-E in FIG. 6, and FIG. 8 is an explanatory diagram showing the idling operating state of FIG.
FIG. 9 is an exploded perspective view of the knob body 5 and ratchet pawl 6.6' according to the third embodiment of the present invention, and FIG. 10 is a perspective view showing the assembled state of the knob body 5 and ratchet pawl 6.6'. , FIG. 11 is a cross-sectional view of the assembled state taken along arrow H-H in FIG. 10, FIG. 12 is an explanatory diagram showing the idling operating state of FIG. 11, and FIG. FIG. 14 is a perspective view of the shaft 3-2 of the fifth embodiment of the present invention. 1.3,5...Knob body, 2...Shaft, 2a...1-shaped groove, 2b...Taper, 2C... Body, 2d...Groove, 2et
2g---Step part, 2f---Shaft, 4
, 6, 6/-...Ratchet claw.

Claims (1)

[Claims for Utility Model Registration] A knob body comprising a knob formed at one end, a hollow cylindrical holder formed at the other end, and a ratchet claw having spring properties provided at the terminal end of the holder; Forming a taper 2b, followed by forming a body portion 2c that slides into the cylindrical hollow portion of the holder,
The shaft 2 is continuous with the shaft 2f via the stopper 2g, and has an L-shaped groove 2a having an L-shaped cross section formed in the body 2c. The ratchet knob is assembled by inserting it into the cylindrical hollow part of the holder of the main body and applying the ratchet claw to the body part 2c.