Slider for slide fastener

1. A slider for a slide fastener, the slider comprising:

a slider body part including an upper wing plate, a lower wing plate that forms an element guide path with the upper wing plate, and a connection column that connects the upper wing plate with the lower wing plate;

a stop tab body that is swingably held in the slider body part; and

a tab elastic member that projects a part of the stop tab body into the element guide path by biasing the stop tab body,

wherein a base part formed integrally on the upper wing plate and an operation cover part rotatably attached to the base part are disposed;

the operation cover part includes a top plate part disposed opposite to an upper surface of the base part, and a pressing projecting part that projects from an inner surface of the top plate part and presses the stop tab body against a biasing force of the tab elastic member;

the pressing projecting part has a structure in which by rotating the operation cover part, a locked state in which a part of the stop tab body is projected into the element guide path by biasing the stop tab body and an unlocked state in which the stop tab body is pressed by the pressing projecting part, whereby a part of the stop tab body is retreated from the element guide path can be switched therebetween;

the pressing projecting part is formed in an arc shape centered on a rotation axis of the operation cover part in a bottom surface view of the operation cover part;

the base part includes a housing recessed groove that is formed in an arc shape in a plan view of the base part and houses the pressing projecting part;

the stop tab body is disposed to overlap with at least a part of the housing recessed groove; and

the pressing projecting part includes a projecting part for release, which presses the stop tab body and holds the unlocked state.

2. The slider according to claim 1 , wherein

the pressing projecting part includes a projecting part for lock, of which a projecting dimension from the top plate part is smaller than that of the projecting part for release.

3. The slider according to claim 2 , wherein the pressing projecting part includes a connecting projecting part that is continuously formed between the projecting part for release and the projecting part for lock; and

a top end surface of the connecting projecting part is formed as an inclined surface smoothly inclined from the projecting part for release toward the projecting part for lock.

4. The slider according to claim 3 , wherein the projecting part for release includes a first projecting part for release and a second projecting part for release, which are disposed in opposite ends of the pressing projecting part having an arc shape respectively;

the projecting part for lock is disposed in a center part of the pressing projecting part having an arc shape; and

the connecting projecting part includes a first connecting projecting part formed between the first projecting part for release and the projecting part for lock, and a second connecting projecting part formed between the second projecting part for release and the projecting part for lock.

5. The slider according to claim 2 , wherein the housing recessed groove of the base part includes a regulating end surface that regulates a rotation of the operation cover part at a predetermined rotation angle of 90° or less each in a clockwise direction and in a counterclockwise direction from a reference position in which the slider is in the locked state.

6. The slider according to claim 1 , wherein the operation cover part includes at least one guide projecting part that projects from an inner surface of the top plate part, and is formed in an arc shape centered on a rotation axis of the operation cover part in a bottom surface view of the operation cover part;

the base part includes a guide recessed groove that is formed in an arc shape in a plan view of the base part and houses the guide projecting part, and at least one spring housing part connected to the guide recessed groove;

at least one guiding elastic member, which biases the guide projecting part, is housed in the spring housing part; and

the guide projecting part of the operation cover part is held in the guide recessed groove when the operation cover part is in a reference position in which the slider is in the locked state, and advances into the spring housing part to be disposed in a position in which the guide projecting part is biased by the guiding elastic member when the operation cover part is rotated from the reference position.

7. The slider according to claim 6 , wherein the guide projecting part includes a pair of first and second guide projecting parts, which has shapes symmetric to each other and is disposed in positions symmetric to each other in a bottom surface view of the operation cover part; and

one guiding elastic member is disposed in a center part of the slider in a width direction, and biases the first or second guide projecting parts when the operation cover part is rotated from the reference position.

8. The slider according to claim 6 , wherein the guiding elastic member includes a pair of first and second guiding elastic members, which is housed in positions symmetric to each other, of the base part in a plan view of the base part; and

the one guide projecting part is disposed in a center part of the slider in a width direction and is biased by the first or second guiding elastic members when the operation cover part is rotated from the reference position.

9. The slider according to claim 1 , wherein the base part includes a tab body housing recessed part that houses the stop tab body;

the operation cover part includes a projecting part for a tab, which projects from an inner surface of the top plate part and presses a part of the stop tab body housed in the tab body housing recessed part; and

the projecting part for a tab is formed inside from the pressing projecting part and formed in an arc shape centered on a rotation axis of the operation cover part in a bottom surface view of the operation cover part.

10. The slider according to claim 1 , wherein the base part includes a tab body housing recessed part that houses the stop tab body, and a pair of tab body holding parts that rotatably holds a swing shaft part of the stop tab body.