Slide unit for drawer

A slide unit for a drawer, the slide unit comprising:

• a fixed rail fixed to a main body;
• a movable rail configured to be movable relative to the fixed rail while being connected to the drawer body to allow the drawer body to be pulled out from and pushed into the main body, and provided with an inner accommodation space;
• and
• an inner rail connected to an end portion of the fixed rail to be disposed in the inner accommodation space of the movable rail, and configured to allow the movable rail to slide relative to the fixed rail,
• wherein the inner rail is formed by rolling;
• and
• the inner rail includes:
• a plate;
• and
• a contact portion integrally connected to an end of the plate, and configured to come into contact with each of a plurality of slide balls accommodated in the inner accommodation space of the movable rail,
• wherein the contact portion includes at least one rolling protrusion provided on each of a plurality of rolling surfaces on the contact portion to be spaced apart from each other, and the rolling protrusion extend along a longitudinal direction of the plate.

A slide unit for a drawer, the slide unit comprising:

• a fixed rail fixed to a main body and provided with an inner accommodation space at a side thereof;
• a movable rail configured to be movable relative to the fixed rail while being connected to a drawer body to allow the drawer body to be pulled out from and pushed into the main body, and provided with an inner accommodation space;
• and
• an inner rail configured such that at least a portion thereof is provided in the inner accommodation spaces of both the fixed rail and the movable rail to allow the movable rail to slide relative to the fixed rail,
• wherein the inner rail is formed by rolling;
• and
• the inner rail includes:
• a plate;
• and
• a first contact portion integrally connected to an upper end of the plate and a second contact portion integrally connected to a lower end of the plate, the first and second contact portions configured to come into contact with a plurality of slide balls accommodated in the inner accommodation spaces of both the fixed rail and the movable rail,
• wherein each of the first and second contact portions is provided with three rolling surfaces to be spaced apart from each other along a circumferential direction thereof, and the rolling surfaces extend along a longitudinal direction of the contact portion,
• wherein the rolling surfaces of the first contact portions include:
• a pair of first rolling surfaces curvedly provided at opposite sides of an upper portion of the contact portion with a pair of first slide balls seated thereon;
• and
• a second rolling surface having a diameter larger than a diameter of each of the first rolling surfaces, and being provided to be curved in a direction toward the drawer body under the first rolling surfaces with a second slide ball rolling thereon,
• wherein the second contact portion with the three rolling surfaces has a symmetrical shape or a mirror shape with respect to the first contact portion with the three rolling surfaces,
• wherein each of the pair of first slide balls has a diameter smaller than the diameter of each of the first rolling surfaces;
• the second slide ball has a diameter smaller than the diameter of the second rolling surface;
• the pair of first slide balls have a same diameter;
• and
• the second slide ball has a diameter larger than the diameter of each of the first slide balls,
• wherein a distance to a center of the first slide balls from a longitudinal center line of the inner rail is longer than a radius of the second slide ball;
• and
• when a point equally distant from the first slide balls and the second slide ball is defined as a center point, an included angle between the second slide ball and a first slide ball close to the second slide ball from the center point is 90° or more, and equal to or less than an angle at which the pair of first slide balls fail to come into contact with each other.