JPH0338456B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a chain clip that is difficult to come off due to its special shape and is easy to attach.

Prior art and its problems Chain clips are used when connecting an end chain to an endless chain, and are used to prevent link plates from coming off by engaging with pin grooves. .

This type of chain clip was first developed in 1983.
-10544, Utility Model Application Publication No. 59-10545, etc., the only way to prevent the chain clip from coming off is to simply use the front pin groove engagement part near the opening as a retaining mechanism. , No measures are taken to prevent the rear pin groove from coming off.

Therefore, conventional chain clips generally have the disadvantage that they tend to come off easily, and if attempts are made to make them difficult to come off, there is a problem in that the resistance during attachment increases, making it difficult to attach.

Means and Effects for Solving Problems The present invention includes a rear engaging portion that engages with a pin groove, and a rear engaging portion that has a width equal to or greater than the diameter of the pin groove and communicates with the rear engaging portion. The above-mentioned problem has been solved by a configuration in which a pair of protrusions having a width at a tip end narrower than the diameter of the pin groove is provided at a connecting portion between the rear side engaging part and the linking hole.

The protrusion prevents the pin from coming off at the rear engagement portion with the pin groove. An extremely large force is required to push this protrusion open from the inside, so that the locking action is reliable.

At the time of installation, if the front side engaging part is forcibly opened and the interval between the tips of this protrusion is opened to be equal to or larger than the groove diameter of the pin, this protrusion will be opened when it is installed. There will be no resistance.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

1 and 2 show a clip 1 of the present invention,
Made of carbon steel or other material, it is formed by laser processing, press punching, etc., and then hardened and tempered. part 5, a pair of openings 6,
6'. (The pin engaging portion closer to the openings 6 and 6' will be referred to as the front pin engaging portion, and the one farther away will be referred to as the rear pin engaging portion.) The rear pin engaging portion 2 is the pin engaging portion. The groove is concentric with the groove, and its radius R is equal to or slightly larger than 1/2 of the groove diameter d of the pin. A pair of protrusions 8, 8' are provided at the connecting portion with the linking hole 4 with an interval b between the tips which is smaller than the groove diameter d of the pin (see FIG. 3).

The other end of the intermediate annular hole 3 is connected to the front pin engaging part 5 through a connecting groove 7, and has openings 6, 6' at the tip, and the openings 6, 6' have inclined R parts 9, 9'. ing. Incidentally, if the force required to attach the pin 10 (see FIG. 3) is somewhat large, the distance between the protrusions 8 and 8' can be made narrower.

The width y of the connecting hole 4 communicating with the rear side engaging part 2 is equal to or larger than the pin groove diameter d, the annular hole 3 is cut out to be larger than the diameter D of the pin 10 (see Fig. 3), and the pitch P is the same as that of the chain. (not shown).

Radius of each engagement surface A, A' of front pin engagement part 5
R′ is slightly larger than 1/2 of the pin groove diameter d,
If the pins 10 and 10 are made eccentric and shifted inward from each other in the direction perpendicular to the pitch direction, the elastic force will cause the pins 10
can be pressed inward to strengthen the engagement force and eliminate looseness. However, it is also possible to simply form a concentric circle with respect to the pin groove as in the conventional case. Note that the width a between the openings 6 and 6' may be the same as the conventional one.

FIG. 3 shows a front view of the pin 10, in which a clip mounting groove 11 is provided all around the circumference.

4 to 7 show the order of attachment of the clip 1. A pin 10 is set upright on a pin link plate 12, a joint link plate 13 is fitted from the other end, and a clip 1 is fitted into a pin groove 11 to prevent it from coming off.

4, 5, 6, and 7 are diagrams showing the order in which the clip is attached to the pin. When the clip 1 is pressed in the direction of the arrow, the inclined R surfaces 9, 9'
The pin 10 enters the openings 6, 6' using the
The clip 1 is elastically deformed and opened about the fulcrum E, and the protrusions 8, 8' are also enlarged to be equal to or larger than the groove diameter d of the pin 10. If you press further in the direction of the arrow, pin 1 will be located at the position shown in Figures 6 and 7.
0 and 10 come and the attachment of clip 1 is completed.

Fig. 8 shows the open state when the clip 1 is pushed in, and the pin is guided by the R surfaces 9 and 9' and has entered the openings 6 and 6', and the pin groove is opened at an interval of the pin groove diameter d. , and if the opening angle around the fulcrum E of the clip is θ, then the protrusions 8 and 8' will similarly open by the angle θ', and when further pressed against the pin in the direction of arrow M, the pin will engage with the pin. It engages in the joining parts 2 and 5.

As mentioned above, in the open state, the protrusions 8, 8'
If the interval between the pin grooves is equal to or larger than the pin groove diameter d, the protrusions 8, 8'
Since there is no resistance, the device can be installed by simply pushing the opening open, as in the case of conventional devices.

After engagement, it is difficult to open the protrusions 8, 8' from the inside (because the distance from the fulcrum E is short, it cannot be opened unless a large force is applied due to the principle of leverage). , the protrusions 8, 8' have a strong function of preventing it from coming off. According to the example, it was confirmed that the force for pressing the clip opening against the pin to attach it was approximately 2.5 times as much as the force for pressing the clip on the opposite side to remove it.

Advantageous Effects of the Invention 1 By having the protrusion, the function of preventing the pin from coming off is significantly improved, and it is easy to engage the pin.

2. When used together with the front pin engagement part, which has an engagement surface shaped like an arc with the center of the arc perpendicular to the pitch direction eccentrically inward, the clip becomes a clip with a retaining mechanism in two places, which prevents the pin from coming off. It becomes an even better prevention mechanism.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIGS. 1 and 2 are a front view and a plan view of the clip, respectively, FIG. 3 is a front view of the pin, and FIGS. 4 to 7 show how the clip is connected to the pin. FIG. 4 and FIG. 6 are cross-sectional views, FIG. 5 and FIG. 7 are front views, and FIG. 8 is a front view showing the clip in the open state. 1...Clip, 2...Rear side engaging part, 8, 8'...Protrusion part, d...Pin groove diameter.

Claims (1)

[Claims] 1. The rear engaging portion has a rear engaging portion that engages with the pin groove, and a linking hole that has a width equal to or greater than the diameter of the pin groove and communicates with the rear engaging portion. and a pair of protrusions having a width at the tip narrower than the diameter of the pin groove are provided at the connecting portion of the linking hole.
Clip for chain.