Latch apparatus for door of vehicle

1. A latch apparatus for a door of a vehicle, the latch apparatus comprising:

a claw lever restrained by a pawl lever to lock a striker as the door is switched from an opened state to a close state, and released from the pawl lever to unlock the striker as the door is switched from the closed state to the open state; and

an elastic member configured to adjust an elastic force provided to the claw lever, as the claw lever is rotated in a state where a first end of the elastic member is movably inserted into a slot formed in the claw lever; and

a movement guide provided on a latch body to guide a moving path of the elastic member inserted therein,

wherein the first end of the elastic member is inserted into the slot,

wherein the first end of the elastic member moves from a first position to a second position in accordance with rotation of the claw lever to lock the striker, and

wherein the first end of the elastic member moves from the second position to the first position in accordance with rotation of the claw lever to unlock the striker,

wherein the movement guide comprises:

a first moving path configured to guide the elastic member to a maximum compression position, as the claw lever is rotated to lock or unlock the striker; and

a second moving path extending from the first moving path to define a circulation path, and guiding the first end of the elastic member from the first position to the second position when the claw lever rotates.

2. The latch apparatus of claim 1 , wherein the elastic member provides an elastic force in a direction opposite to a rotating direction of the claw lever, as the door is switched from the closed state to the open state.

3. The latch apparatus of claim 1 , wherein the elastic member adjusts intensity of the elastic force through rotation of the claw lever in a state where a second end of the elastic member is secured to the latch body to be spaced apart from the claw lever.

4. The latch apparatus of claim 1 , wherein the second moving path comprises:

a first zone configured to provide an elastic restoring force, in a direction where the claw lever is rotated, to the first end of the elastic member when the striker is locked;

a second zone bent from the first zone, and moving the first end of the elastic member as the striker is switched from a second stage lock state to an unlock state, thus providing an additional elastic force to the elastic member; and

a third zone extending from the second zone, guiding the movement of the first end of the elastic member to the maximum compression position when the striker is switched to the unlock state, and providing an elastic restoring force in a direction where the claw lever is rotated toward an initial position.

5. The latch apparatus of claim 4 , wherein the first moving path guides the movement of the elastic member to the maximum compression position in a direction where the door is closed when the striker is locked, and guides the movement of the elastic member to the maximum compression position in a direction where the door is opened from a point where the third zone is completed when the striker is unlocked.

6. The latch apparatus of claim 5 , wherein the elastic member provides the elastic force in the rotating direction of the claw lever at the maximum compression position when the striker is locked, thus causing the door to be in a first stage lock state, and continuously provides an elastic force in a direction where the door is closed, thus causing the door to be in a second stage lock state, as the elastic member leaves the maximum compression position of the first stage lock state.

7. The latch apparatus of claim 5 , wherein the elastic member provides the elastic force in the rotating direction of the claw lever when the striker is unlocked, thus causing the door to be switched from the second stage lock state to the first stage lock state, and continuously provides an elastic force in a direction where the door is opened, as the elastic member leaves the maximum compression position of the first stage lock state.

8. The latch apparatus of claim 4 , wherein the elastic member provides an elastic force in the direction where the door is closed when entering the first zone, and provides an elastic force in the direction where the door is opened when the third zone is completed.

9. The latch apparatus of claim 4 , further comprising:

a stopper formed to be selectively compressed by a central portion of the elastic member that moves downwards, as the first end of the elastic member is moved to the second position and passes through the second zone when the striker is unlocked.

10. The latch apparatus of claim 9 , wherein the stopper is formed of a material having elasticity to be compressed or released as it is pressed by the central portion of the elastic member.