JPH0118012Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a buckle used to detachably connect one end of a so-called chin strap to the other end of a helmet.

Conventionally, a wide variety of buckles have been proposed and put into practical use. However, since the buckle attached to the helmet's chin strap is located on the side of the wearer's face when the helmet is worn, the wearer cannot engage or detach it while looking at the buckle. Therefore, the engagement and disengagement operation is extremely simple, so-called one-touch operation,
Moreover, it is required that the engagement be made reliably.

Conventionally, as a buckle for a helmet chin strap that satisfies such requirements, a device described in Japanese Utility Model Publication No. 1934/1983 has been known and put to practical use. The idea is
An opening consisting of an insertion engagement piece and a sheath body housing a movable engagement piece that engages and disengages the insertion engagement piece, and a side end of the sheath body that serves as an operating section of the movable engagement piece is provided at the side end of the sheath body. However, since an opening is provided at the side end of the sheath body and the side end of the movable engagement piece is exposed from the opening, there is no risk of a traffic accident while wearing the helmet. There is a drawback that when an encounter occurs, the skin of the face may come into strong pressure contact with the opening or the side edge of the movable engagement piece, or the skin may be injured by biting into it, and in fact, such an accident has occurred. has been reported.

The purpose of the present invention is to provide a buckle that can eliminate the above-mentioned drawbacks and is suitable for use in a helmet chin strap. The explanation based on this is as follows.

In FIG. 1, one ring 2 of a buckle 1 according to the present invention is attached to one end 4a of a chin strap 4 extending from one end of a helmet 3, and the other ring 5 is attached to the other end of the helmet 3. It is attached to the connecting piece 6.

As shown in FIGS. 4 and 5, the buckle 1 is
It consists of an insertion engagement piece 7 and a sheath body 9 containing movable engagement pieces 8, 8 that can be engaged with and disengaged from the insertion engagement piece 7. The insertion engagement piece 7 has the ring portion 2 and has outward engagement ears 10 on both sides of the tip. The sheath body 9 is
It consists of a substrate 9a and an upper plate 9b, and the tip end face is open. Movable engagement pieces 8, 8 are arranged on the base plate 9a, and the center portions thereof are rotatably pivoted by shafts 11, 11. The movable engaging pieces 8, 8 have inward engaging claws 12, 12 at their tips and extension legs 1 at their rear ends.
3 and 13, and one working leg 13 is provided with an abutment portion 13a bent rearward. The movable engagement pieces 8, 8 are actuated by the other ends of springs 15, 15, one end of which is attached to the projections 14, 14, thereby urging the engagement claws 12, 12 so that they always tend to close. There is.

As shown in FIGS. 2, 3, and 5, the upper plate 9
In the center part of b, there is a stepped surface 16 and a small diameter part 1 on the upper circumferential surface.
A raised portion 18 having a diameter of 7 is integrally provided, and an arcuate guide hole 19 of an appropriate length is provided behind it (see FIG. 4). A knob 20 is rotatably arranged on the raised portion 18. That is, 20 knobs
has a through hole 21 in the center and a small diameter portion 2 on its inner peripheral surface.
2 is provided, and the lower surface of the small diameter portion 22 is the step surface 1.
6, the annular piece 23 is placed on the upper surface of the small diameter portions 17 and 22, and the tip caulked portion 24 of the raised portion 18 protruding from the central hole is fitted onto the upper surface of the annular piece 23. It's hardened. Furthermore, a concave portion 25 provided on the outer periphery of the lower surface of the knob 20 centered around the through hole 21 is provided with an operating protrusion 26 that protrudes downward. It faces the movement area of section 13a. In addition, a spring 2 is provided in the recess 25 of the knob 20.
7, one end of which is locked in a locking part 28 provided in the recess 25, and the other end is locked in a locking part 29 provided in the upper plate 9b.

Note that the illustrated coupling structure between the upper plate 9a and the knob 20 by the raised portion 18 and the annular piece 23 is merely an example, and other structures may be adopted.
The structure is not limited to the above structure. For example, in addition to making the connection by inserting a screw with a head into the raised part 18 from above, as shown in FIG. A knob 32 is provided; a connector 35 is provided with a collar 33 at the upper end and a caulked portion 34 at the lower end; and the connector 35 is fitted into the through hole 30 to close the collar 33.
It is possible to adopt a structure in which the crimping portion 34 is received by the stepped surface 31, and the caulking portion 34 is inserted into a through hole 36 provided in the upper plate 9b and caulked to the inner surface of the upper plate 9b.

Furthermore, it goes without saying that a flexible sheet may be attached to appropriate parts of the outer surfaces of the sheath body 9 and the knob 20, if necessary.

In the buckle 1 according to the present invention having the above-described configuration, when the knob 20 is rotated counterclockwise in FIG. While moving upward in FIG. 4 along
At the same time, one of the working legs 13 pushes the other working leg 13 clockwise in FIG. Therefore, the fourth
As shown by chain lines in the figure, the engaging claws 12, 12 of the movable engaging pieces 8, 8 use the shafts 11, 11 as fulcrums and open against the action of the springs 15, 15, and the insertion engaging pieces 7
The state of engagement with the engagement ears 10, 10 is released. Furthermore, when the engagement state is released in this manner and the insertion engagement piece 7 is removed from the sheath body 9, the movable engagement piece 8,
The engaging claws 12, 12 of 8 are closed by the action of springs 15, 15, but when the insertion engaging piece 7 is pushed into the opening surface of the sheath body 9 in the closed state, the movable engaging pieces 8,
The engaging claws 12, 12 of 8 use the shafts 11, 11 as a fulcrum, and once open against the action of the springs 15, 15, and then close again to close the engaging ears 10, 1 of the insertion engaging piece 7.
It will engage with 0.

Incidentally, the length of the arc-shaped guide hole 19 of the upper plate 9b is within the range that regulates the rotation angle of the knob 20, but if the length is made long to a certain extent,
The engaged state cannot be released unless the knob 20 is rotated through a wide angle.
0 means that safety is maintained such that the engagement state will not be released even if the engagement state is inadvertently slightly rotated due to some external force other than manual operation.

The buckle according to the present invention not only can be removed extremely easily by rotating the knob as described above, but also allows the knob, which is the operating part, to be moved away from the wearer's face. Since it is placed on the top surface of the sheath, it is extremely safe and will not bite into the wearer's face and cause injury, unlike the conventional helmets mentioned above, even in the event of a traffic accident while wearing the helmet. be. Moreover, the said knob is
Since it is arranged so as to protrude from the upper surface of the buckle, it can be rotated even when wearing gloves, making it extremely convenient and suitable for practical use as a buckle for a helmet chin strap.

[Brief explanation of the drawing]

The drawings show one embodiment of the buckle according to the present invention. FIG. 1 is a side view of the buckle attached to the helmet chin strap. Figure 2 is a plan view of the knob viewed from below. FIG. 3 is a sectional view taken along the line XX in FIG. 2. FIG. 4 is a plan view of the buckle with the top plate removed. FIG. 5 is a vertical cross-sectional view of the buckle. FIG. 6 is a cross-sectional view of another embodiment of the coupling structure between the upper plate and the knob. 1... Buckle, 3... Helmet, 4... Chin strap, 7... Insert engagement piece, 8... Movable engagement piece, 9...
... Sheath body, 10 ... Engagement ear, 12 ... Engagement claw, 13
... Working leg, 19 ... Guide hole, 20 ... Pinch, 2
6... Operation protrusion.

Claims (1)

[Claims for Utility Model Registration] An insertion engagement piece having engagement ears on both sides of the distal end; rotatably disposed within the sheath, and having an engagement claw at the distal end for engaging and disengaging the engagement ears; A buckle for a helmet chin strap, comprising a pair of first and second movable engagement pieces each having a first spring that acts in a direction to engage the engagement claw with the engagement ear; a. and a working leg protruding inwardly at the rear end of the second movable engaging piece so that the working leg of the first movable engaging piece is located outside of the working leg of the second movable engaging piece; A contact portion is provided on the working leg of the first movable engagement piece; b. A knob is rotatably arranged in a protruding state on the upper plate of the sheath body, and acts on the knob in the direction of rotation thereof; a second spring is installed inside; c. an operating protrusion protruding from the lower surface of the knob comes into contact with the operating leg of the first movable engagement piece through an arcuate guide hole provided in the upper plate; d. When the knob is rotated by a certain angle against the action of the second spring provided inside, the operating protrusion of the knob engages the first movable engagement piece. The first and second movable engagement pieces are moved by pressing the contact portions of the working legs inwardly, thereby pressing the working legs of the second engaging piece inwardly via the working legs. Said first
The engaging claws of both movable engaging pieces are pivoted to move outward against the action of a spring, thereby releasing the engagement of both movable engaging pieces with the insertion engaging piece. The buckle is characterized in that: