KR100803997B1 - Ball transfer - Google Patents

Abstract

The present invention relates to a ball transfer, and more particularly, to a ball transfer that can improve the rolling motion and wear resistance and durability by preventing foreign matter such as dust or dust into the ball transfer.

To this end, in the present invention, a ball cup, a rolling ball contained in the ball cup, a cover having a tapered hole to prevent the rolling ball from being separated from the ball cup, and a plurality of balls provided between the ball cup and the cover surrounding the lower circumference of the rolling ball. In a ball transfer comprising a bearing ball of the present invention, a ball transfer is provided in which the O-ring is provided to block a gap with a rolling ball.

According to the present invention, the foreign matter such as dust or dust through the gap between the cover and the rolling ball in advance prevents the inflow of the rolling ball and the bearing ball has the advantage that can keep the rolling motion smoothly without interference of foreign matter .

Ball Transfer, Cover, Taper Hole, O-Ring Groove, O-Ring, Brush

Description

Ball transfer {BALL TRANSFER}

1 is a side cross-sectional view showing a conventional ball transfer,

2 is an exploded perspective view showing a ball transfer according to the first embodiment of the present invention;

3 is a side cross-sectional view of the coupled state of FIG.

Figure 4 is a side cross-sectional view showing another embodiment of the O-ring according to the present invention,

5 is a side sectional view showing a ball transfer according to a second embodiment of the present invention;

6 is a side sectional view showing a ball transfer according to a third embodiment of the present invention;

7A and 7B are side cross-sectional views showing flanged and bolted ball transfers in accordance with the present invention.

<Explanation of symbols for the main parts of the drawings>

100: ball transfer 110: ball cup

111: ball receiving groove 120: rolling ball

130: bearing ball 140: cover

141: taper hole 143: O-ring groove

145: flow space portion 150: O-ring (Oring)

151: protrusion frame 160: brush

The present invention relates to a ball transfer, and more particularly, to a ball transfer that can improve the smooth rolling motion and wear resistance and durability by preventing foreign matter such as dust or dust into the ball transfer.

In general, the ball transfer (or ball caster) can be rotated smoothly and freely. Therefore, the ball transfer (or ball caster) is required to move and rotate the goods with a small force in a production line or a large logistics system of various products, or to require mobility such as a chair or a walker. The situation is being used in a variety of goods.

These ball transfers are classified into press forming type, resin forming type and cutting type according to the manufacturing method, and are classified into flange type, spring cushion type, cylindrical type and bolt type according to their shape.

1 is an example of a conventional bolt-shaped ball transfer, as shown, a rolling ball 12 which is a spherical rotating body contained in a ball cup 11 and a ball receiving groove 11a formed concave in the ball cup 11. ), The rolling ball 12 is interposed between the cover 14 having the tapered hole 14a so as not to be separated from the ball cup 11, the ball receiving groove 11a and the cover of the ball cup 11, and the rolling ball. It is composed of a plurality of bearing balls 13 to facilitate the rotational movement of (12).

Therefore, when an external force is applied to the object to be transported on the rolling ball 12, the rolling ball 12 is rotated in accordance with the displacement of the object to be transported, and at the same time a plurality of bearing balls ( 13) is rotated in the ball receiving groove (11a) of the ball cup 11 so that the frictional resistance due to the movement of the object (W) can be minimized.

However, in the conventional ball transfer configured as described above, foreign matter such as dust or dust is entangled on the surface of the rolling ball 12 due to the rolling motion caused by contact with the object such as the object to be transported (W) and the taper of the cover 14 It enters into the ball receiving groove 11a of the ball cup 11 through the gap between the hole 14a and the rolling ball 12, which causes a smooth rolling motion of the rolling ball 12 and the bearing ball 13 only. However, in severe cases, the rolling ball 12 adheres to foreign matter on the surface of the object to be transported, such as a semiconductor wafer or a plasma display panel, thereby causing a fatal problem that adversely affects the quality of the object to be transported.

In addition, in the conventional ball transfer, the bearing ball 13 is filled in the ball receiving groove 11a of the ball cup 11 in a state in which a plurality of rotating bearing balls 13 are wrapped tightly around the rolling ball 12. During the rotation, the friction area between each other is increased due to lack of free space due to the flow, and friction balls are generated due to frequent collisions and interferences between the bearing balls 13, and as a result, rolling of the rolling ball 12 There was a problem that the movement is not done smoothly.

Moreover, in the conventional ball transfer, a gap is inevitably generated between the taper hole 14a of the cover 14 and the rolling ball 12, so that no lubricant can be filled at all. Therefore, it is very difficult to reduce the frictional force generated on the friction surface of the ball receiving groove 11a and the rolling ball 12 and the bearing ball 13 of the ball cup 11 or to dissipate the frictional heat generated from the friction surface. 12) and the wear of the bearing ball 13 occurred in a short time there was a problem that the life of the ball transfer is shortened.

Accordingly, the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a ball transfer to ensure a smooth rolling movement by preventing foreign matter from flowing into the ball cup of the ball transfer. It is.

Another object of the present invention is to provide a ball transfer to minimize the friction noise caused by rolling motion of the rolling ball and the bearing ball.

It is still another object of the present invention to provide a ball transfer that can prevent leakage of lubricant.

In order to achieve the above object, the present invention provides a ball cup, a rolling ball contained in the ball cup, a cover having a tapered hole formed so that the rolling ball does not escape from the ball cup, and a rolling ball provided between the ball cup and the cover. A ball transfer comprising a plurality of bearing balls surrounding a lower periphery of a ball transfer, the ball transfer provided with an O-ring for blocking a gap with the rolling ball in the cover.

Hereinafter, a configuration according to an embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

Prior to this, all components having the same function in the following drawings are omitted by repeated reference to the same reference numerals, and the following terms are defined in consideration of functions in the present invention, which is a technical spirit of the present invention It should be interpreted as a concept consistent with the meaning and in its own usual meaning.

In addition, in the following description of the present invention, detailed descriptions of related well-known functions or constructions may obscure the gist of the present invention.

Figure 2 is an exploded perspective view showing a ball transfer according to a first embodiment of the present invention, Figure 3 is a side cross-sectional view of the coupled state of Figure 2, as shown in Figures 2 and 3 in the first embodiment of the present invention The ball transfer according to the ball rolling ball ball 110 and the ball cup 110 and the rolling ball (120) formed with a rolling ball 120 and a concave ball receiving groove 111 to accommodate the rolling ball 120 to the rolling motion The O-ring 150 is installed on the cover 140 surrounding the rolling ball 120 while preventing the separation of the bearing ball 130 interposed between the 120 and the gap between the cover 140 and the rolling ball 120 perfectly. It is configured to block.

Specifically, the cover 140 has a tapered hole 141 is formed to ensure a smooth rolling motion while maintaining only the upper portion of the rolling ball 120, the inner peripheral surface of the tapered hole 141 The O-ring groove 143 is formed, and the O-ring 150 is coupled to the O-ring groove 143 in close contact with the outer circumferential surface of the rolling ball 120.

Therefore, the O-ring 150 hermetically blocks the gap between the cover 140 and the rolling ball 120, thereby preventing the inflow and accumulation of foreign substances such as dust or dust through the gap.

Here, the O-ring groove 143 may be formed at intervals of 0.5mm to 1mm from the upper edge of the tapered hole 141. This is to maximize the blocking effect of foreign substances by installing the O-ring 150 close to the top end of the table hole 141 and at the same time to smoothly rotate the rolling ball 120, and improve the direction. .

In addition, the O-ring 150 may be made of a material having excellent physical and mechanical properties such as heat resistance, abrasion resistance, corrosion resistance, low friction, and the like, such as PTFE (polytetrafluoroethylene), elastomer, silicone, Viton, leather, etc. .

On the other hand, Figure 4 is another embodiment of the O-ring according to the present invention, as shown, the upper and lower pair of protruding frame 151 is formed along the inner circumference of the O-ring 150. This is because a pair of protruding frame 151 formed up and down is closely contacted and line contacted in parallel along the inner circumference of the rolling ball 120 to make a more perfect sealing, and also protrudes from the inner circumferential surface of the O-ring 150 Because it is in the form of a flexible to respond to the external force and the contact surface to minimize the wear, thereby extending the life of the O-ring 150 accordingly.

FIG. 5 illustrates a second embodiment according to the present invention, in which a flow space 145 is formed along the periphery of the lower end of the taper hole 141 of the cover 140. The flow space 145 allows the bearing ball 130 to smoothly and freely flow and rotate to reduce the friction area between the bearing balls 130, thereby minimizing noise caused by friction.

Here, since the components having the same function as the above-described first embodiment exhibit the same or similar operations as the first embodiment, the same reference numerals are used in the drawings, and the detailed description thereof will be omitted.

FIG. 6 illustrates a third embodiment according to the present invention, and includes a brush 160 in contact with the rolling ball 120 along the circumference of the upper end of the taper hole 141 of the cover 140. The brush 160 has a plurality of hairs protruding along the inner side of the annular frame, and the tip of the hair is in contact with the outer circumferential surface of the rolling ball 120, so that dust, dust, or the like is formed in the gap between the cover 140 and the rolling ball 120. In addition to preventing foreign matters from entering, it is possible to remove foreign substances on the surface during rolling motion of the rolling ball.

Here, since the components having the same function as the above-described first embodiment exhibit the same or similar operations as the first embodiment, the same reference numerals are used in the drawings, and the detailed description thereof will be omitted.

On the other hand, the present invention is not limited to the above-described embodiment and the accompanying drawings, as shown in Figures 7a and 7b and substituted within the scope without departing from the spirit of the present invention, such as flanged or bolted ball transfer It will be apparent to those skilled in the art that the present invention may be modified to other equivalent embodiments.

The present invention configured as described above forms an O-ring groove along the inner circumferential surface of the tapered hole formed in the cover, and the O-ring groove is installed in the O-ring groove in close contact or line contact with the outer circumferential surface of the rolling ball to ensure the gap between the cover and the rolling ball. You can block. Therefore, foreign matters such as dust or dust are prevented from flowing through the gap between the cover and the rolling ball, so that the rolling ball and the bearing ball can maintain a smooth rolling motion without interference of the foreign matter.

In addition, the present invention forms a flow space around the lower end of the tapered hole, it is possible to ensure a sufficient free space for the plurality of bearing balls to flow and rotate more smoothly and freely. Therefore, the friction noise is reduced by reducing the friction area between the bearing balls.

In addition, the present invention lubricates the lubricant to be injected into the ball receiving groove of the ball cup to improve the rolling properties of the rolling ball and the wear resistance of the rolling ball and the bearing ball. Through injection of rolling ball and bearing ball always keep the rolling motion of the optimum state, and has a very useful effect that can greatly improve the durability to extend the life of the product.

Claims (7)

delete A ball cup, a rolling ball contained in the ball cup, a cover having a tapered hole so that the rolling ball is not separated from the ball cup, and a plurality of bearing balls provided between the ball cup and the cover to surround the lower circumference of the rolling ball. In ball transfer, An o-ring groove is formed along the inner circumferential surface of the tapered hole of the cover, and the o-ring is coupled to the o-ring groove to be in close contact with the outer circumferential surface of the rolling ball. The method of claim 2, The O-ring groove is ball transfer, characterized in that formed at intervals of 0.5mm to 1mm from the upper edge of the tapered hole. delete delete delete delete

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