KR200424228Y1 - table lifting apparatus - Google Patents

Abstract

It relates to the start of the table lift which can adjust the height of the table. The disclosed table elevating device includes a fixed table that supports the table top plate, a platform having one side fixed to the upper plate and capable of elevating movement with respect to the fixed table, a drive unit for elevating and driving the platform, and an elevating range limiting unit for regulating the elevating range of the platform. The lifting range limiting unit includes a limit support plate fixed to the platform, a pair of limit switches installed up and down on the limit support plate to generate a stop signal for each of the upper limit position and the lower limit position, and fixed to the stator and limit switch. It is provided with a sensing bar provided with a locking projection for touching the lever. The lifting device of such a structure regulates the lifting range by a pair of limit switches arranged up and down, so that the structure is very simple and convenient to manufacture compared to the conventionally operated complex rotating body, and the pair of limit switches is changed. As soon as the lifting range is adjusted, it is easy to adjust to the desired range.

Table, lifting, limit switch

Description

Table lifting apparatus

1 is a view showing a conventional table lifting device,

Figure 2 is a view showing the appearance of a table employing the lifting device according to the present invention,

3 is a view showing a lift device employed in the table of FIG.

4A and 4B are diagrams illustrating a state in which a table top plate is moved to a lower limit and an upper limit, respectively, according to the operation of the elevator shown in FIG. 3.

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

110 ... Retention Base 111 ... Retention Plate Support Plate

120 ... platform 121 ... platform support plate

130 ... motor 131 ... ball screw member

132 ... support tube 133 washer

134 ... nut 141,142 ... limit switch

143 ... Limit support plate 143a ... Guide groove

150 ... sensing bar 151

200 ... tops

The present invention relates to a device for driving an elevating table, and more particularly, to a table elevating device that is easy to adjust the elevating range and has a very simplified structure.

For example, table-type workbenches, such as bathroom sinks or kitchen or office tables, have a different height depending on the height of the user. Accordingly, in order to meet the demand of the appropriate height felt by each person, a lifting type table that allows the user to adjust the height in recent years has been widely spread. In other words, the table can be lifted by the power of the motor, so that the table can be raised and lowered to the required height to fit the body shape.

On the other hand, in order to prevent the malfunction of the table outside the controllable range during the lifting operation, a limit switch is provided to give a stop signal to the motor at the upper and lower limits of the lifting, respectively. FIG. 1 shows a table having such a braking function. As a driving unit of the lifting device, it shows the structure disclosed in the Republic of Korea Utility Model Registration No. 0389217. This is because the table (not shown) is lifted while the worm gear 20a and the worm wheel 20b are rotated by the rotation of the motor 10, and the OFF groove 51 of the click gear 50 rotates in conjunction with the worm wheel 20b. ) Is a structure in which a stop signal is generated at the moment when the lever 31 of the limit switch 30 is applied, and the length corresponding to one rotation of the click gear 50 is in the lifting and lowering range. In other words, when the lever 31 of the limit switch 30 is caught in the OFF groove 51 of the first click gear 50, the lower limit height is raised. Then, the motor 10 is driven to raise the table, and then the OFF groove is again. (51) The moment when the lever 31 is caught is the maximum height. Thus, the user adjusts the table to the desired height in the range in between.

By the way, in the conventional lifting structure, since the various members to be rotated at the same time by the motor 10 to make the structure is complicated and difficult to manufacture, there is a disadvantage, the first rotation of the click gear 50 is above all Because of the length of the stroke, it is not easy to widen the lifting range. That is, in order to widen the lifting range, the diameter of the click gear 50 must be increased, and then the worm wheel 20b, the worm gear 20a, the motor 10, and the like must all be enlarged to increase the lifting range. It follows a lot.

Therefore, in order to solve this disadvantage, there is a need for a new structure of the lifting device that is simple in structure and which can easily adjust the lifting range.

The present invention has been made in view of the above necessity, and an object thereof is to provide an improved table elevating device for easily adjusting the elevating range with a simplified structure.

Other objects and advantages of the present invention will be described below and will be appreciated by the embodiments of the present invention. In addition, the objects and advantages of the present invention can be realized by the means and combinations indicated in the claims.

The present invention for achieving the above object, a support for supporting a table top plate, a lifting table coupled to one side is fixed to the top plate and capable of lifting movement with respect to the fixed base, and a drive unit for driving the lifting platform; A table lift apparatus comprising a lift range limiting unit that regulates a lift range of a lift table, wherein the lift range limit unit is mounted on a limit support plate fixed to either one of the lift table and the fixed table, and is installed on the limit support plate, respectively. And a pair of limit switches for generating a stop signal for an upper limit position and a lower limit position, and a sensing bar that is fixed to the other side of the limit support plate of the platform and the fixed platform and provided with a locking protrusion for touching a lever of the limit switch. When the lifting platform moves up and down, the locking projection of the sensing bar is the limit switch Geolrimyeonseo characterized in that the so as to generate a stop signal.

The limit support plate is preferably provided with a guide groove for accommodating the sensing bar so as not to rotate so that the position of the locking projection with respect to the lever of the limit switch does not change.

One side of the limit support plate is characterized in that it is provided with a wire receiving groove for receiving the wires for supplying a signal or power to the limit switch.

The drive unit includes a support tube fixed to the fixing stand, one side is fixed to the lifting platform and the other side is inserted into the support tube and screwed ball screw member, and a motor for rotating the ball screw member. desirable.

The ball screw member is characterized in that the lower end is provided with a washer guided along the inner diameter of the support tube when the ball screw member is raised and lowered.

And a cylinder rod having one end fixed to either one of the platform and the fixed table, and a cylinder rod which rises and descends the platform by pneumatically or hydraulically emerged from the cylinder body.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors will appropriately describe the concept of terms in order to best explain their own design. Based on the principle that it can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical ideas of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

Figure 2 shows the appearance of the table employing the lifting device according to the present invention, Figure 3 shows the lifting device mounted therein. The table has a structure of a typical table holding the upper plate 200 is fixed to the holding unit 110, the lifting device is installed inside the holding unit (110).

As shown in FIG. 3, a lift table 120 fixed to the upper plate 200 through the support plate 121 is inserted to be lifted and lifted in the holder 110. That is, the height of the upper plate 200 is lowered (see FIG. 4A) when the platform 120 enters the fixing unit 110 as in the barrel structure of the telescope, and the height of the upper plate 200 is increased when the upper plate 200 is raised out of the fixing unit 110. Connected in structure (see FIG. 4B).

In addition, as a driving unit for elevating the platform 120, the support tube 132 fixed to the support plate 111 of the fixed base 110, and one end side is fixed to the support plate 121 of the platform 120 In the state, the body is inserted into the support tube 132 is provided with a screw screw ball 131 and a motor 130 for rotating the ball screw member 131. Accordingly, when the motor 130 is operated, the ball screw member 131 rotates to move in and out of the support pipe 132, and thus the lifting table 120 moves up and down with respect to the fixing base 110.

The ball screw member 131 has a washer 133 which is guided along the inner diameter of the support pipe 132 when the ball screw member 131 is raised and lowered at the lower end.

In addition, the lifting range limiting unit regulating the lifting range of the platform 120, the limit support plate 143 fixed to the support plate 121 of the platform 120, and fixed to the support plate 111 of the fixed base 110 The sensing bar 150 and a pair of limit switches 141 and 142 disposed up and down are provided. Of course, the limit support plate 143 may be directly fixed to the upper plate 200 without being fixed to the support plate 121. That is, when the platform 120 is elevated, the limit support plate 143 moves together, and at this time, the levers 141a and 142a of the two limit switches 141 and 142 installed on the limit support plate 143 are fixed to the stationary 110. The stop signal is generated at the upper and lower limit lines while being caught by the locking protrusion 151 of the sensing bar 150 fixed to the upper and lower ends.

Reference numeral 143a represents a guide groove provided in the limit support plate 143 to accommodate the sensing bar 150, and the sensing bar 150 is constrained to not rotate in the guide groove 143a. If the sensing bar 150 returns freely, the position of the locking protrusion 151 may be changed, and thus, the sensing bars 150 may not be properly touched by the levers 141a and 142a of the limit switches 141 and 142. Is housed so as not to return in the guide groove (143a).

One side of the limit support plate 143 is formed with a wire receiving groove 147 in which the wires 143 for receiving signals or power are supplied to the limit switches 141 and 142.

The cylinder body 161, one end of which is fixed to either one of the lifting table 120 and the fixing table 110, and the cylinder rod 163 which rises and lowers the lifting table 120 by pneumatically or hydraulically floating from the cylinder body 161. It may be further provided.

The table elevating device having such a configuration operates as follows.

First, in the state where the table top plate 200 is lowered to the lower limit line, the ball screw member 131 is completely inserted into the support tube 132 as shown in FIG. 4A, and the locking protrusion 151 of the sensing bar 150 is located on the upper side. Touching the lever 141a of the limit switch 141 induces a stop signal so that the motor 130 no longer rotates in the downward direction.

In this state, to raise the height of the upper plate 200 to the maximum, the motor 130 is operated to rotate the ball screw member 131. Then, the ball screw member 131 rotates and rises from the support tube 132 to push up the support plate 121 of the platform 120. Since the support plate 121 of the lift table 120 is coupled with the upper plate 200, when the support plate 121 is raised, the upper plate 200 is also raised. When the upper plate 200 reaches the upper limit in this manner, as shown in FIG. 4B, the lever 142a of the lower limit switch 142 is touched by the locking protrusion 151 of the sensing bar 150 to further upward direction. This generates a stop signal to prevent the motor 130 from turning.

This lifting device is not a complicated structure in which several rotating bodies must be rotated as in the prior art, and the lifting device is braked by using limit switches 141 and 142 disposed up and down, and therefore, the structure is simple and the two switches ( By simply opening or closing the space between 141 and 142, the entire stroke, i.e., the total height of lifting and lowering, is adjusted immediately, so that the lifting range of the table can be easily adjusted and used.

On the other hand, in the present embodiment exemplified a structure in which the limit support plate 143 is fixed to the lifting table 120 and the sensing bar 150 is fixed to the fixing table 110, since this is to cause relative movement, it is fixed by changing positions with each other. The same operation can be implemented.

As shown in FIG. 4A, the washer 133 is inserted into the lower end of the ball screw member 131, and the washer 133 is fixed to the lower end of the ball screw member 131 using the nut 134. According to the operation of the motor 130, the ball screw member 131 is rotated and soared from the support tube 132 so that the support plate 121 of the platform 120 is elevated or vice versa, the platform 120 is lowered. . However, since the ball screw member 131 is located at the inner center of the support pipe 132 during the elevating operation of the elevating table 120, the elevating table 120 may be caused to flow sideways. The washer 133 mounted on the lower end of the ball screw member 131 is guided along the inner diameter of the support tube 132 when the ball screw member 131 is moved up and down, so that the ball screw member 131 flows in the support tube 132. This is prevented and thereby the platform 120 is not generated during the lifting operation. The washer 133 is raised and lowered along the inner diameter of the support tube 132, so noise may be generated. Therefore, the washer 133 is preferably made of a plastic material to prevent noise.

Since the support pipe 132 and the limit support plate 143 are in a very close position, the ball screw member 131 is rotated and rotated according to the operation of the motor 130, and thus the wire 143 or the control signal of the limit switches 141 and 142. The wires 143 may be damaged by being caught by the ball screw member 131 on which the wires 143 for supplying power are being rotated. Therefore, the table elevating device of the present invention can prevent the wires 143 from being damaged by accommodating the wires 143 in the wire receiving groove 147 formed on one side of the limit support plate 143.

In addition, the table elevating device of the present invention is pneumatically or hydraulically emerged from the cylinder body 161 and the cylinder body 161, one side of which is fixed to the support plate 111 of the fixed base 110 to lift the support plate 121 of the platform 120 A cylinder rod 163 to be lowered may be provided to stably lower and lower the upper plate 200 when the upper plate 200 is lowered. In particular, when there is a heavy object in the upper plate 200, when the upper plate 200 is elevated according to the rotation of the ball screw member 131, the upper plate 200 is not lifted stably by the load of the object, the cylinder body The shock is alleviated by the 161 and the cylinder rod 163, so that the lifting operation can be stably performed.

As described above, the table lifting apparatus according to the present invention provides the following effects.

First, since the lifting range is regulated by a pair of limit switches arranged up and down on the limit support plate, the structure is very simple and convenient to manufacture compared to the conventionally operated complex rotating body.

Second, since the lift range is adjusted immediately by changing the pair of limit switches, it is very easy to adjust the range to the desired range.

Third, the wires 143 may be prevented from being damaged by accommodating the wires 143 in the wire receiving groove 147 formed at one side of the limit support plate 143.

Fourth, the upper plate can be raised and lowered by the cylinder body 161 and the cylinder rod 163 can be raised and lowered in a stable manner.

As described above, although the present invention has been described by way of limited embodiments and drawings, the present invention is not limited thereto and is intended by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the scope of equivalents of the claims to be described.

Claims (6)

A holding table supporting a table top plate, a lifting table having one side fixed to the upper plate and being capable of lifting and lowering with respect to the holding plate, a drive unit for driving the lifting platform and a lifting range limiting unit for regulating the lifting range of the lifting platform; In the lifting device including a table, The lifting range limiting unit, A limit support plate fixed to one of the platform and the fixed table; A pair of limit switches provided up and down on the limit support plate to generate stop signals for upper and lower limit positions, respectively; Including the sensing bar is fixed to the other side of the limit support plate and the lifting table and the fixed, and provided with a locking projection for touching the lever of the limit switch, And the lifting table moves up and down, and the locking protrusion of the sensing bar is caught by the limit switch to generate a stop signal. The method of claim 1, The limit support plate, the table lifting device characterized in that the guide bar for receiving the sensing bar so as not to rotate to guide the guide so that the position of the locking projection relative to the lever of the limit switch is provided. The table lift apparatus according to claim 1 or 2, wherein one side of the limit support plate is provided with a wire receiving groove for receiving wires for supplying a signal or power to the limit switch. The method of claim 1, wherein the drive unit, A support tube fixed to the holder; One side is fixed to the platform and the other side is inserted into the support pipe screw screw member and, Table lifting device characterized in that it comprises a motor for rotating the ball screw member. 5. The table elevating apparatus according to claim 4, wherein the ball screw member has a washer at a lower end thereof, the washer having a guide guided along the inner diameter of the support tube when the ball screw member is lowered. 6. The cylinder body according to claim 1, 2 or 4 or 5, wherein one end of the cylinder body is fixed to either one of the platform and the fixed table, and the platform is lifted up and down by pneumatic or hydraulic pressure. A table elevating device comprising a cylinder rod.

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