Opening/closing apparatus and helmet including the same

1. An opening/closing apparatus capable of manipulating a sun visor, which is opened and closed at a front side of a front opening of a helmet main body, from a top portion of the helmet, the opening/closing apparatus comprising:

a sliding member in which its one end portion is coupled to a central top end portion of a sun visor, and a grip helping the sliding member to move forwards and backwards is formed at another end portion;

a guide holder that is attached to an inner top portion of the helmet main body and guides a forward and a backward movement of the sliding member; and

a damper that is a saw-toothed member and is attached to one side of the guide holder,

wherein the sliding member includes a returning spring of which one end is connected with a rear surface of the one end portion of the sliding member, and another end is connected with a bottom surface of the guide holder,

wherein the returning spring has elasticity when the sliding member moves forwards, and the sliding member is automatically returned to its said original position from a forward position by the elasticity, so that the sun visor automatically moves to a hidden position,

wherein a saw-toothed uneven surface portion is formed at one side surface of the sliding member, and

wherein when the sliding member is automatically returned to its original position by the elasticity, the damper rotates in gear with the uneven surface portion and attenuates the elasticity so that the sliding member moves backwards slowly and smoothly, thereby preventing the sun visor moving to the hidden position from colliding with the helmet main body.

2. The opening/closing apparatus of claim 1 , wherein the sliding member includes:

a connector, at a one end portion, which is coupled to the central top end portion of the sun visor,

wherein the connector serves as a connecting groove into which an insertion-type stopper formed at the central top end portion of the sun visor is inserted.

3. The opening/closing apparatus of claim 1 , wherein the guide holder includes:

a button assembly accommodating part protruded from a specified position to accommodate a button assembly,

wherein the button assembly, while being accommodated in the button assembly accommodating part, is engaged with a lower surface of the sliding member to fix a position of the sun visor and released from the lower surface of the sliding member to cancel the fixed position of the sun visor.

4. The opening/closing apparatus of claim 3 , wherein the button assembly includes:

a body constituting a part of the button assembly;

a cavity penetrating the body such that the sliding member is moved forwards and backwards;

a manipulation button that includes an engaging protrusion protruded upwardly from a bottom surface of the cavity and a elastic protrusion protruded downwardly from a lower surface of the body; and

an elastic member, to which the elastic protrusion is inserted, configured to elastically support the manipulation button,

wherein the engaging protrusion is engaged with an engaging member installed at the lower surface of the sliding member positioned in the cavity by the forward movement of the sliding member, so that the sliding member moved forwards is maintained as moved.

5. A helmet including a sun visor clamped to an inside of a helmet main body through hinge shafts at both sides of the helmet main body, the helmet comprising:

the sun visor detachably clamped to the hinge shafts via through holes formed at both ends to be moved forwards and backwards in front of a front opening; and

an opening/closing apparatus including:

a sliding member in which its one end portion is coupled to a central top end portion of the sun visor, a grip helping the sliding member to move forwards and backwards is formed at another end portion,

a guide holder that is attached to an inner top portion of the helmet main body and guides a forward and a backward movement of the sliding member, and

a damper that is a saw-toothed member and is attached to one side of the guide holder,

wherein the sliding member includes a returning spring of which one end is connected with a rear surface of the one end portion of the sliding member, and another end is connected with a bottom surface of the guide holder,

wherein the returning spring has elasticity when the sliding member moves forwards, and the sliding member is automatically returned to its said original position from a forward position by the elasticity, so that the sun visor automatically moves to a hidden position,

wherein a saw-toothed uneven surface portion is formed at one side surface of the sliding member, and

wherein when the sliding member is automatically returned to its original position by the elasticity, the damper rotates in gear with the uneven surface portion and attenuates the elasticity so that the sliding member moves backwards slowly and smoothly, thereby preventing the sun visor moving to the hidden position from colliding with the helmet main body.

6. The helmet of claim 5 , wherein the sliding member includes:

a connector, at a one end portion, which is coupled to the central top end portion of the sun visor,

wherein the connector serves as a connecting groove into which an insertion-type stopper formed at the central top end portion of the sun visor is inserted.

7. The helmet of claim 5 , wherein the guide holder includes:

a button assembly accommodating part protruded from a specified position to accommodate a button assembly,

wherein the button assembly, while being accommodated in the button assembly accommodating part, is engaged with a lower surface of the sliding member to fix a position of the sun visor and released from the lower surface of the sliding member to cancel the fixed position of the sun visor.

8. The helmet of claim 7 , wherein the button assembly includes:

a body constituting a part of the button assembly;

a cavity penetrating the body such that the sliding member is moved forwards and backwards;

a manipulation button that includes an engaging protrusion protruded upwardly from a bottom surface of the cavity and a elastic protrusion protruded downwardly from a lower surface of the body; and

an elastic member, to which the elastic protrusion is inserted, configured to elastically support the manipulation button,

wherein the engaging protrusion is engaged with an engaging member installed at the lower surface of the sliding member positioned in the cavity by the forward movement of the sliding member, so that the sliding member moved forwards is maintained as moved.