Background Art Generally, in sites, such as work floors, building <BR> sites and fire floors, etc. , where they are always exposed to danger, workers must wear safety helmets for the sake of safety. The safety helmets protect the heads of the workers from outside impacts and prevent accidents.

Furthermore, the safety helmets must not interfere with the work of the workers while being worn on the head of the workers. Therefore, the safety helmets are light

enough for the above-mentioned purpose. In addition, the safety helmets have sufficient strength to stably protect the heads of the workers from outside impacts.

As shown in FIG. 6, the conventional safety helmets each include a helmet body 100 which has a hemispherical shape and covers the head of a wearer, and an impact absorbing unit 120 which is installed in the helmet body 100.

The conventional safety helmet further includes a head support 140 and a support band 160 which are provided in the impact absorbing unit 120, and a chin strap 180 to maintain the safety helmet on the head.

The support band 160 allows the helmet body 100 to'be spaced apart from the crown of the head at a predetermined interval, thus reducing the transfer of an impact to the head. The above-mentioned elements are fastened in the helmet body 100 by a fastening bracket 110 which is provided on each of opposite sides of the helmet body 100.

Each end of the chin strap 180 is coupled to the corresponding end of the fastening bracket 110.

However, in the conventional safety helmet, the fastening brackets 110 are coupled to the opposite sides of the helmet body 100 by locking bolts 112. Therefore, a plurality of bolt locking holes 100a must be formed on the helmet body 100 for the coupling of the fastening brackets 110 to the helmet body 100 using the locking bolts 112.

As a result, due to the bolt locking holes 100a in the

helmet body 100, it is impossible to execute a voltage withstand test of the safety helmet. Thus, the stability of the safety helmet may be deteriorated.

Furthermore, the head support 140 is installed in the impact absorbing unit 120 by a rivet and a hook. The chin strap 180 is fastened to the helmet body 100 by the fastening brackets 110. Accordingly, a process of assembling the conventional safety helmet is inconvenient to the user.

In addition, the use of the separate assembling units increases production costs of the safety helmet.

Moreover, a support holder 150, provided on a rear portion of the head support 140 to support the back of the head of the wearer, extends from the rear portion of the helmet body 100 rearwards and downwards in a diagonal direction. Therefore, when the safety helmet moves on the head of the wearer, both ends of the support holder 150 press the back of the head of the wearer. Thus, the conventional safety helmet may be painful to the wearer.

Disclosure of the Invention Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a safety helmet in which inner elements comprising an impact absorbing unit, a head support, a support band and a chin

strap are simultaneously fastened to a plurality of bolt locking protrusions provided on an inner surface of a helmet body by a plurality of locking bolts, thus increasing workability and productivity in the process of assembling the safety helmet, and in which the inner elements are attached to the helmet body by the bolts, thus providing a firm assembly, thereby providing stability for the safety helmet.

Another object of the present invention is to provide a safety helmet which has a line guide groove provided between the helmet body and the impact absorbing unit, so that a transceiver, installed between the helmet body and the impact absorbing unit, is easily coupled to an outside device, such as a radio, etc. through the line guide groove.

A further object of the present invention is to provide a safety helmet in which a support holder constituting the head support is parallel at an inner surface thereof to the back of the head of a wearer, thus being convenient to the wearer wearing, and maintaining the safety helmet in stably on the head of the wearer.

In order to accomplish the above object, the present invention provides a safety helmet, including: a helmet body; an impact absorbing unit installed in the helmet body; a head support provided in the impact absorbing unit; a support band removably provided in the impact absorbing unit

to allow the helmet body to be spaced apart from a head of a user wearing the safety helmet at a predetermined interval; and a chin strap to maintain the safety helmet in a state of being worn on the head. The safety helmet further includes a plurality of bolt locking protrusions provided on opposite sides of an inner surface of the helmet body, so that inner elements, which are provided in the helmet body, are locked to the bolt locking protrusions together by a plurality of locking bolts.

Brief Description of the Drawings The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG. 1 is a bottom exploded perspective view of a safety helmet, according to the present invention ; FIG. 2 is a bottom perspective view of the safety helmet of the present invention; FIGS. 3 and 4 are enlarged exploded perspective views of important parts of the safety helmet of the present invention; FIG. 5 is a partially enlarged view of a support holder connecting part of a head support of the safety helmet of the present invention; and

FIG. 6 is a sectional view of a conventional safety helmet.

Best Mode for Carrying Out the Invention Hereinafter, an embodiment of the present invention will be described in detail with reference to the attached drawings.

As shown in FIGS. 1 and 4, a safety helmet 1 of the present invention includes a helmet body 10, an impact absorbing unit 12 which is installed in the helmet body 10, and a head support 14 which is provided in the impact absorbing unit 12. The safety helmet 1 further includes a support band 16 which is removably provided in the impact absorbing unit 12 to allow the helmet body 10 to be spaced apart from the head of a wearer wearing the safety helmet 1 at a predetermined interval. The safety helmet 1 further includes a chin strap 18 to maintain the safety helmet 1 in a state of being worn on the head. A plurality of bolt locking protrusions lOa are integrally provided both sides of an inner surface of the helmet body 10. The bolt locking protrusions 10a protrude inwards while being spaced from each other at predetermined intervals.

A plurality of locking holes 12a and 14a are respectively provided on opposite side surfaces of both the impact absorbing unit 12 and the head support 14 which are

installed in the helmet body 10. The plurality of locking holes 12a and 14a correspond to the bolt locking protrusions 10a. A locking bolt 11 is tightened into each of the bolt locking protrusions 10a through the locking holes 12a and 14a.

Both a connector 13b and a transceiver 13 are provided at a predetermined position between the helmet body 10 and the impact absorbing unit 12. The connector 13b leads to the outside through a line guide groove 12b which is provided at a predetermined position on the impact absorbing unit 12. The connector 13b is easily coupled to a separate device such as a radio (not shown).

The transceiver 13 has at an end thereof a coupling hole 13a. The transceiver 13 is installed in the helmet body 10 by the locking bolt 11 passing through the coupling hole 13a along with inner elements comprising the impact absorbing unit 12, the head support 14 and the chin strap 18.

The chin strap 18 is interposed between the impact absorbing unit 12 and opposite sides of the inner surface of the helmet body 10, on which the bolt locking protrusions 10a are provided. The chin strap 18 firmly maintains the safety helmet 1 on the head of the wearer. A plurality of through holes 18b is provided on both ends of the chin strap 18 to correspond to both the locking holes 12a of the impact absorbing unit 12 and the locking holes 14a

of the head support 14.

At this time, opposite parts of the chin strap 18, which are fastened to opposite sides of the inner surface of the helmet body 10, are coupled to each other by a hook 18a which is provided on the chin strap 18. An openable speaker bag 19 is provided on either of the opposite parts of the chin strap 18 to be placed around the ear of the wearer. A speaker (not shown), coupled to the transceiver 13, is installed in the openable speaker bag 19.

As shown in FIG. 5, the head support 14 includes a vertical extension part 14c and a horizontal extension part 14d which integrally extend downwards and rearwards from a rear portion of the head support 14. The head support 14 further includes a support holder 14b which is provided on the horizontal extension part 14d to adjust an inner diameter of the head support 14.

While the wearer wears the safety helmet 1, an inner surface of the support holder 14b comes into close contact with the back of the head of the wearer. Therefore, even though the safety helmet 1 undesirably moves on the head during work, the support holder 14b does not press or irritate the back of the head, but is comfortable and stable to the wearer.

In the drawings, the reference numeral 17 denotes a safety net to stably support the head of the wearer.

The operation and assembling process of the safety

helmet of the present invention having the above-mentioned construction will be described herein below.

First, the process of assembling the safety helmet 1 is as follows. As shown in FIG. 1, the impact absorbing unit 12, the support band 16 provided in the impact absorbing unit 12, the head support 14 and the chin strap 18 are sequentially installed in the helmet body 10. The above-mentioned inner elements are fastened together to the bolt locking protrusions 10a, which are provided on opposite sides of the inner surface of the helmet body 10, by the locking bolts 11 tightened into the bolt locking protrusions 10a after passing through the locking holes 12a and 14a and the through hole 18b of the inner elements.

At this time, the transceiver 13 is provided between the helmet body 10 and the impact absorbing unit 12. The transceiver 13 is fastened to the bolt locking protrusion 10a along with the inner elements while the locking bolt 11 continuously passes through the coupling hole 13a which is provided on the end of the transceiver 13. The connector 13b, coupled to the transceiver 13, is easily led to the outside through the line guide groove 12b provided at the predetermined position on the impact absorbing unit 12.

As such, the inner elements are simultaneously fastened to the helmet body 10 through one fastening process using the locking bolts 11 and the bolt locking protrusions lOa provided on the inner surface of the helmet

body 10. Therefore, the process of assembling the safety helmet 1 is very simplified, thus increasing workability and productivity of the safety helmet 1.

Furthermore, the inner elements are firmly fastened to the helmet body 10 by the locking bolts 11. Therefore, the safety helmet 1 provides the stability to the wearer while being worn on the head of the wearer. In addition, the safety helmet 1 efficiently protects the wearer's head from outside impact.

Moreover, the transceiver 13, provided between the impact absorbing unit 12 and the inner surface of the helmet body 10, is simply coupled to a separate device, such as the radio (not shown), by the connector 13b which leads to the outside from the transceiver 13 through the line guide groove 12b.

Therefore, the safety helmet 1 is convenient to the wearer and has enhanced reliability.

Industrial Applicability As described above, the present invention provides a safety helmet in which inner elements comprising an impact absorbing unit, a head support, a support band and a chin strap are fastened to a plurality of bolt locking protrusions provided on an inner surface of a helmet body by a plurality of locking bolts, thus increasing

workability and productivity in the process of assembling the safety helmet, and increasing the stability of the safety helmet through the bolt coupling structure.

Furthermore, a transceiver, installed in the safety helmet, is easily coupled to a connector through a line guide groove of the impact absorbing unit. Therefore, the safety helmet of the present invention has an additional function, thereby being convenient to a wearer.