Vehicle seat slide device

1. A vehicle seat slide device comprising:

an upper rail that supports a seat located above the upper rail;

a lower rail that supports the upper rail so that the upper rail is movable relative to the lower rail;

a lock mechanism that restricts movement of the upper rail relative to the lower rail; and

a lock release mechanism that permits movement of the upper rail relative to the lower rail by performing an unlocking action with the lock mechanism based on an operating force received from a transmitting member, wherein

the lock release mechanism includes

an input lever connected to the transmitting member, and

a release lever that presses an unlock element of the lock mechanism and performs the unlocking action with the lock mechanism when pressed and pivoted about a support shaft by the input lever that is pivoted based on the operating force,

the release lever includes a longitudinal extension, which extends toward the input lever in a longitudinal direction of the upper rail, a widthwise extension, which extends in a widthwise direction of the upper rail, and a vertical extension, which extends in a vertical direction of the upper rail,

the longitudinal extension, the widthwise extension, and the vertical extension are integral,

the release lever is configured so that the vertical extension presses the unlock element as the input lever presses the widthwise extension from above, and

the support shaft of the release lever is located at the longitudinal extension of the release lever.

2. The vehicle seat slide device according to claim 1 , wherein

the upper rail includes two side walls, which are opposed to each other in the widthwise direction of the upper rail, and an upper wall, which connects the two side walls, and

the lock release mechanism is configured so that the vertical extension of the release lever presses the unlock element, which is located below the upper wall, through a hole extending through the upper wall.

3. The vehicle seat slide device according to claim 1 , wherein

the widthwise extension is continuous with an upper end of the longitudinal extension, and

the vertical extension is continuous with a distal end of the widthwise extension spaced apart from the longitudinal extension.

4. The vehicle seat slide device according to claim 1 , wherein the lock release mechanism further includes a support bracket fixed to the upper rail and pivotally supporting the input lever and the release lever.

5. The vehicle seat slide device according to claim 4 , wherein

the support bracket includes a support wall that supports the support shaft of the release lever,

the support wall includes a first surface and a second surface at an opposite side of the first surface, and

in a state in which a position at which the widthwise extension is pressed by the input lever is located in a region facing the first surface of the support wall, the release lever is pivotally supported on the second surface of the support wall.

6. The vehicle seat slide device according to claim 1 , wherein

the lock release mechanism further includes an urging member that urges the release lever in a direction opposite to a direction in which the release lever is pivoted when the release lever is pressed by the input lever, and

the lock release mechanism is configured so that the release lever, which is pivoted based on an urging force of the urging member, presses the input lever when the operating force is not received from the transmitting member.