JPH11244007A - Chin strap fastener of helmet for work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a chin strap to be easily and surely fastened and loosened and to be wear on the chin without uncomfortable feeling. SOLUTION: A buckle consists of two side frames 2a arranged to put a chin strap in-between from the width side, the first and second guide parts 2b and 2c placed between both ends of these side frames 2a to guide the chin strap 1 inside, an engaging part 2d placed between the central parts of two side frames 2a, and an engaging part 2e placed between the engaging part 2d and the second guide part 2c to bind the tip end of the chin strap. When the chin strap is stretched between both guide parts 2b and 2c, the strap is pressed on the engaging end 2d' of the engaging part 2d to be held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chin strap tightener for a work helmet.

[0002]

2. Description of the Related Art As shown in FIG.
A jaw cord P in the form of a tape is attached to the ear tape N attached to the inside of both sides, and both jaw cords P are connected by a fastening tool Q such as a one-touch hook at the time of attachment. Adjustment of the length such as the degree of tightening of the chin string P has been performed by moving the chin string P passed through the buckle R in order.

[0003] However, the conventional adjustment of the length of the chin string P by the buckle R has a problem that it takes time and effort and is inconvenient.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to make it possible to easily and surely tighten and loosen a chin strap. Another object of the present invention is to provide a chin strap tightening tool for a work helmet that can be worn on the chin without any discomfort.

[0005]

According to the present invention, there is provided a chin strap tightening device for a work helmet, comprising two side frames arranged so as to sandwich a tape-shaped chin strap from a width direction, and both end portions of these side frames. The first to guide the chin strap inside
And a second guide portion, a locking portion provided between the center portions of the two side frames, and a tip portion of a chin strap provided between the locking portion and the second guide portion. A locking portion for locking;
And the buckle body is configured to be pressed against and locked to the locking end of the locking portion when the chin string is tensioned between the two guide portions. It is also characterized in that the above-mentioned chin string is folded back around the relay member to which the tip of another chin string is fixed outside the second guide part. Further, it is also characterized in that the outer side surface of the side frame is curved in a concave shape. Further, the side frame is formed in a substantially rectangular shape so as to be along the chin of the helmet wearer.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1, 1 '
Is a chin string made of narrow width (tape-shaped) fabric, etc.
The base ends on both sides are attached to a chin strap attachment portion (not shown) of a protective cap such as a helmet.

Reference numeral 2 denotes a buckle body,
a, 2a, a rod-shaped guide 2b, and a plate-shaped guide 2
c, a locking portion 2d, and a locking portion 2e.
3 is a relay member.

As is apparent from FIGS. 1B and 1C, the side frames 2a and 2a are kept at substantially the same width as or slightly wider than the width of the chin string 1, and the chin string 1 is disposed therebetween. Have been. The center of the outer surface of each side frame 2a is concavely curved, and a jagged unevenness 2a 'is engraved on the surface of the outer surface to prevent the finger F from slipping. Also,
As is clear from FIG. 1A, the side frame 2a is formed in a substantially rectangular shape in which the upper center is depressed.

At one end of the side frames 2a, 2a, the guide portion 2b is integrally formed between them, and at the other end of the side frames 2a, 2a, the guide portion 2c is integrally formed. Is formed.

At the center of the side frames 2a, 2a, the locking portion 2d is formed between them. The locking side end 2d 'of the locking portion 2d is connected to each of the guide portions 2b, 2c.
Located below the straight line connecting. In addition, the locking portion 2d
The locking portion 2e is formed between the guide portion 2c and the guide portion 2c.

As is clear from FIG. 1A, the chin strap 1
Is inserted from above between the guide portion 2b and the locking portion 2d, and is inserted under the locking portion 2d, that is, the locking side end portion 2d.
It passes through the lower side of d ', exits between the locking portion 2e and the guide portion 2c, is folded back around the relay member 3, and the tip of the chin string 1 is locked to the locking portion 2e. . The other end of the chin string 1 ′ is connected to the relay member 3. Note that the relay member 3 may be omitted, and the chin string 1 may be directly wound around the ear tape N or the like as shown in FIG.

Since the chin strap fastener of the above embodiment is constructed as described above, when the chin straps 1 and 1 'are to be fastened, the side frame 2a is held by the finger as shown in FIG. When the buckle 2 is moved in the direction L while being sandwiched by F,
The distal end of the chin string 1 is pulled leftward by the locking portion 2e, and moves the relay member 3 leftward. As a result, the chin strap 1 'is pulled, and the chin straps 1 and 1' are totally tightened.

When the chin straps 1 and 1 'are fully tensioned, as shown in FIG. 2, their tensions P1 and P2
As a result, the locking side end 2 of the locking piece 2d
Since the pressing force P3 against d 'is generated, the locking state of the locking piece 2d and the chin strap 1 is maintained even when the finger F is released from the buckle 2.

When the chin straps 1 and 1 'are loosened, the chin strap 1 is slightly pulled toward the buckle 2 as shown by an arrow P4 in FIG. If P1 is reduced or set to zero, the pressing force P3 against the locking piece 2d is reduced or set to zero, so that it is possible to easily move in the direction R.

The buckle body 2 of the present embodiment, in particular, the side frame 2a is formed in a substantially rectangular shape with a concave central portion, so as shown in FIG. The contact can be made stable and comfortable.

[0016]

Advantages of the Invention 1) The work of tightening and loosening the chin string can be performed easily and reliably, and the chin string can be attached to the chin without any discomfort.

[Brief description of the drawings]

FIG. 1 is a partial sectional view (A), a plan view (B), and a bottom view (C) showing an embodiment of a chin strap fastener of a work helmet according to the present invention.

FIG. 2 is an explanatory view of an operation of locking a chin string by a locking piece.

FIG. 3 is a diagram showing a state at the time of mounting.

FIG. 4 is an explanatory diagram of a conventional chin strap attached state.

[Explanation of symbols]

 1, 1 'chin strap 2 buckle 2a side frame 2a' irregularities 2b guide portion 2c guide portion 2d locking portion 2d 'locking side end portion 2e locking portion 3 relay member C chin F finger L direction P1, P2 Tension P3 Pressing force P4 Arrow R direction

Claims (4)

[Claims] 1. Two side frames arranged so as to sandwich a tape-shaped chin from the width direction, and first and second guides provided between both ends of the side frames to guide the chin into the inside. A second guide portion, a locking portion provided between the center portions of the two side frames, and a tip portion of a chin strap provided between the locking portion and the second guide portion. And a buckle body configured to be locked by being pressed against the locking end of the locking portion when the chin string is tightened between the two guide portions. A chin strap fastener for a work helmet, characterized in that: 2. The work according to claim 1, wherein the chin strap is folded back outside the second guide portion by hanging the chin strap on a relay member to which the tip of another chin strap is fixed. A helmet strap tightener. 3. The chin strap tightener for a work helmet according to claim 1, wherein an outer side surface of the side frame is curved in a concave shape. 4. The helmet tightening device for a working helmet according to claim 1, wherein the side frame is formed in a substantially rectangular shape so as to follow the chin of the helmet wearer. .