KR101601931B1 - The automotive lift column - Google Patents

The automotive lift column Download PDF

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Publication number
KR101601931B1
KR101601931B1 KR1020150100532A KR20150100532A KR101601931B1 KR 101601931 B1 KR101601931 B1 KR 101601931B1 KR 1020150100532 A KR1020150100532 A KR 1020150100532A KR 20150100532 A KR20150100532 A KR 20150100532A KR 101601931 B1 KR101601931 B1 KR 101601931B1
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KR
South Korea
Prior art keywords
column
guide groove
guider
hole
frame
Prior art date
Application number
KR1020150100532A
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Korean (ko)
Inventor
김시년
양선진
Original Assignee
(주)우진쿼터스
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Publication date
Application filed by (주)우진쿼터스 filed Critical (주)우진쿼터스
Priority to KR1020150100532A priority Critical patent/KR101601931B1/en
Application granted granted Critical
Publication of KR101601931B1 publication Critical patent/KR101601931B1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F3/00—Devices, e.g. jacks, adapted for uninterrupted lifting of loads
    • B66F3/44—Devices, e.g. jacks, adapted for uninterrupted lifting of loads with self-contained electric driving motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
    • B66F2700/00—Lifting apparatus
    • B66F2700/09—Other lifting devices

Abstract

The present invention relates to an automotive lift column which is installed between lower and upper plates and has a height adjusted through the operation of a lifting unit. The automotive lift column comprises: an outer column which has a hollow outer frame, a first outer guide groove formed on the inner side of the outer frame in a vertical direction, and a second outer guide groove formed on the outer side of the outer frame in a vertical direction; an inner column which has a hollow inner frame inserted into the outer frame, a first inner guide groove formed on the outer side of the inner frame in a vertical direction, and a second inner guide groove formed on the inner side of the inner frame in a vertical direction; a first lifting guide which has a first catching protrusion and a first guide inserted between the first outer guide groove and the first inner guide groove; an outer cover which fixes the first lifting guide to the outer column; a second lifting guide which has a second catching protrusion and a second guide inserted between the first outer guide groove and the first inner guide groove; and an inner cover which has a second fixed mounting ring mounted in the bottom surface of the inner column, a second mounting groove for fixing the second catching protrusion, and a second fitting protrusion fitted to the first outer guide groove of the outer column and fixes the second lifting guide to the inner column.

Description

The automotive lift column

The present invention relates to an electric lift column, and more particularly, it relates to an electric lift column capable of preventing failure or breakage of repeatedly lifting and lowering operations of an inner column through rigid fixed installation of first and second lift guiders by an outer cover and an inner cover In addition, the present invention relates to an electric lift column capable of achieving an improvement in durability as well as cost reduction through easy manufacture, installation and assembly, and ease of installation, and a safe and smooth lifting operation to reduce vacuum and noise .

Generally, a vibrating type lift column is a device for adjusting the height of a mechanical device. The vibrating type lift column is composed of a rectangular lower column provided with a lower plate, a rectangular intermediate column rising and falling inside the lower column, An upper column of a quadrangular shape which is lowered and provided with an upper plate, and an ascending and descending means for ascending and descending the upper column.

In addition, a lower bushing is provided on the upper inner circumferential surface of the lower column, a first intermediate bushing and a second intermediate bushing are respectively installed on the lower outer peripheral surface and the upper inner peripheral surface of the intermediate column, and an upper bushing is provided on the lower outer peripheral surface of the upper column A lower cover is provided at the upper end of the lower column, and a first intermediate cover and a second intermediate cover are provided at the lower end and the upper end of the intermediate column, respectively.

Therefore, when the elevating / lowering means is operated, the upper column is elevated and lowered to the telescopic type together with the intermediate column on the lower column, so that the elevation of the mechanical device can be automatically controlled.

However, in the conventional electric lift column described above, a large amount of vibration is generated between the lower column, the intermediate column, the intermediate column, and the upper column during the upward / downward movement, and this causes the upper column and the intermediate column to vertically support and guide The lower bushing, the first intermediate bushing, the second intermediate bushing, the upper bushing, etc., failed to perform their original functions.

Thus, in the conventional electric lift column, the lower column and the intermediate column can not be vertically moved up and down in a straight line, resulting in a lot of vibration. In addition, durability is lowered due to the vibration, And there was a problem that the stable operation could not be performed.

In order to solve such a problem, an electric lift column such as No. 10-1006695 has been developed, thereby eliminating the clearance and reducing the vibration occurring during the ascending and descending.

Patent Registration No. 10-1006695 (December 31, 2010) "Electric Lift Column" - Jeans Motion

However, the above-described conventional electric lift column has a problem that a coupling hole is formed only at the corner of each column, that is, only four coupling grooves are formed in each column, which results in poor durability of the column, There is a problem that the bushing is detached when the column is lifted and lowered, thereby causing safety problems such as vibration.

Thus, the present applicant has developed an electric lift column which not only can be easily installed in a simple configuration, but also has high durability and vibration and noise due to lift-up operation can be reduced.

It is an object of the present invention to provide a method and an apparatus for mounting a first and a second lifting guider in a state in which the first and second lifting guides are firmly fixed to an outer column and an inner column by an outer cover and an inner cover, respectively, The present invention provides an electric lift column in which failure or breakage is prevented and maintenance is facilitated.

In addition, the present invention is characterized in that the inner column is inserted into the outer column, and then the outer cover and the inner cover are bolted to each other so that the first and second lifting guiders are inserted into the first inner and outer guide grooves, And the through holes formed in the inner and outer columns are formed by four hollow holes and four through holes symmetrically formed in the left and right directions, so that the ease of manufacture and construction is increased, And to provide an electric lift column capable of improving durability.

It is another object of the present invention to provide an electric lift column in which the lifting operation of the inner column is safely and smoothly performed by the lubricant filled in the lubricating grooves of the first and second lifting guides, have.

According to an aspect of the present invention, there is provided an image forming apparatus including a hollow outer frame for forming a first through hole in a vertical direction, a first outer guide groove formed in a vertical direction inside the outer frame, An outer column constituting a second outer guide groove formed on the outer side in a vertical direction; A first inner guide groove formed on an outer side of the inner frame so as to correspond to the first outer guide groove, and a second inner guide groove formed on the outer side of the first inner guide groove, An inner column constituting a second inner guide groove formed in the vertical direction inside the inner frame; A first lifting guider configured by a first engaging jaw which is engaged with an upper surface of the outer column and a first guider which is integrally formed in a direction perpendicular to the first engaging jaw and is sandwiched between the first outer guide groove and the first inner guide groove; A first fixed mounting ring formed on the upper surface of the outer column to form a first mounting through hole corresponding to the first through hole and a second fixed mounting ring formed on an inner lower portion of the first fixed mounting ring A first fitting protrusion formed on the inner side of the upper portion of the first fixed mounting ring so as to cover the first elevating guider and fitted in the first inner guide groove of the inner column; An outer cover for fixing the first lifting guider to the outer column in a state in which the first guider is in close contact with the first inner guide groove of the inner column; A second lifting guide formed integrally with the second engaging jaw in a direction perpendicular to the second engaging jaw, the second lifting guider being sandwiched between the first inner guide groove and the first inner guide groove; A second fixed mounting ring formed on the lower surface of the inner column by forming a second mounting through hole corresponding to the second through hole and formed on the upper outer side of the second fixed mounting ring to correspond to the first inner guide groove; A second fitting protrusion protruding from the lower outer side of the second fixed mounting ring so as to cover the second lifting guider and fitted in the first outer guide groove of the outer column; And an inner cover for fixing the second lifter guider to the inner column with the second guider in close contact with the first outer guide groove of the outer column.

Since the electric lift column of the present invention is firmly fixed to the outer column and the inner column by the outer cover and the inner cover in a state where the first and second lift guiders are sandwiched between the first and second inner guide grooves, There is an advantage that failure or breakage is prevented even when the lifting operation is performed, and the maintenance is facilitated.

In addition, the present invention is characterized in that the inner column is inserted into the outer column, and then the outer cover and the inner cover are bolted to each other so that the first and second lifting guiders are inserted into the first inner and outer guide grooves, And the through holes formed in the inner and outer columns are formed by four hollow holes and four through holes symmetrically formed in the left and right directions, so that the ease of manufacture and construction is increased, It is possible to reduce the cost and increase the durability.

In addition, the present invention is a useful invention in that the lifting and lowering operation of the inner column is safely and smoothly performed by the lubricant filled in the lubricating grooves of the first and second lifting guides, thereby reducing vibration and noise caused by lifting and lowering operations.

1 is a perspective view of an electric lift column of the present invention.
Fig. 2 is a perspective view showing the interior of the electric lift column of the present invention as seen in section; Fig.
3 is an enlarged view of a portion A in Fig.
4 is an enlarged view of a portion B in Fig.
5 and 6 are exploded perspective views of the electric lift column of the present invention in exploded view.
FIG. 7 is a perspective view showing an inner column inserted into an outer column of the present invention. FIG.
8 is a perspective view showing the first and second lift guiders of the present invention.
9 is a perspective view showing an outer cover of the present invention.
10 is a perspective view showing the inner cover of the present invention.

Hereinafter, the structure of the present invention will be described.

The present invention relates to an electric lift column 100 installed between a lower plate 1 and an upper plate 2 to adjust the height of the lift column 3 through the operation of the elevating means 3, The inner cover 120 includes a column 110, an inner column 120, a first lift guider 130, an outer cover 140, a second lift guider 150, and an inner cover 160, This will be described in more detail below.

1 to 7, the outer column 110 is fixed to the upper surface of the lower plate 1 by bolts to support a motor-driven elevating device (not shown) such as an electric table, Shaped outer frame 113, and it is preferable that each of the corner portions is formed of a rectangular frame each of which is chamfered.

A plurality of first through holes 111 are formed in the vertical direction of the outer frame 113. The first through hole 111 includes four hollow holes 111a, The hollow hole 111a and the top hole 111b may be formed on the respective surfaces of the outer frame 113, respectively, or may be formed on the inner surface of the outer frame 113, Respectively, and are symmetrically formed in front, back, left, and right.

The first through hole 111 is formed by four hollow holes 111a and four through holes 11b in order to facilitate the injection molding of the outer frame 113 and ensure durability. to be.

That is, if the first through-hole 111 is formed entirely as the hollow hole 111a, injection molding becomes difficult. In the case where the first through-hole 111 is formed as the top hole 111b, There is a problem that the top hole 111b is broken due to the operation and the pressure to which the bolt is tightened. In order to facilitate manufacture and ensure durability, the first through hole 111 is formed with four hollow holes 111a, And four through-holes 111b.

The outer column 110 is formed with a first outer guide groove 115 formed in the vertical direction inside the outer frame 113 and a second outer guide groove 115 formed on the outer side of the outer frame 113 in the vertical direction. The first and second outer guide grooves 115 and 117 are inserted into the outer column 110 to provide a stable and stable movement of the inner column 120 moving up and down. It is preferable to form one or two on each surface of the outer frame 113 for supporting.

In addition, the second outer guide groove 117 is formed by arranging a column (not shown) having a larger size on the outer side of the outer column 110 and fixing the same to the lower plate, that is, 1 internal guide grooves 125. [0053]

Secondly, the inner column 120 is connected to the elevating means 3 fixed to the lower plate 1 through the upper plate 2 and is driven by the elevating means 3 from the inside of the outer column 110 And a second through hole 121 is formed in the vertical direction to constitute a hollow inner frame 123 to be inserted into the outer frame 113.

The inner frame 123 is formed by a square frame having chamfered edges in the same manner as the outer frame 113 and the second through hole 121 is formed by four hollow holes 121a and four And a top hole 121b, and are formed symmetrically with respect to the front, back, left, and right sides.

The inner column 120 further includes a first inner guide groove 125 formed in the vertical direction on the outer side of the inner frame 123. At this time, The first and second guide rails 130 and 150 are formed at positions corresponding to the first outer guide grooves 115 of the outer column 110 for the installation of the first and second lift guiders 130 and 150.

In addition, the inner column 120 further includes a second inner guide groove 127 formed in the inner side of the inner frame 123 in the vertical direction.

In the present invention, the inner column 120 may have a multi-stage structure such as a three-stage or a four-stage structure so as to have a telescopic shape. At this time, A structure for inserting and installing a smaller-sized column in the inside of the inner column 120, that is, a structure that plays the same role as the first outer guide groove 115 of the outer column 110, And is fixedly connected to the upper plate 2 by bolts.

2 to 6 and 8, the first lifting guider 130 is fixed to the upper portion of the outer column 110 to guide the lifting operation of the inner column 120, A first engaging protrusion 131 which is engaged with the upper surface of the outer column 110 and a first outer guide groove 115 and a first inner guide groove 125 which are integrally formed in a direction perpendicular to the first engaging jaw 131, And a first guider 135 sandwiched between the first guider 135 and the second guider 135.

One surface of the first guider 135 is fixed to the outer surface of the inner column 120 on which the first inner guide groove 125 is formed by the outer cover 140, And a first lubricant groove 137 filled with lubricant is further provided on one surface of the first guider 135 closely attached to the first internal guide groove 125 So that the lifting operation of the inner column 120 can be performed more smoothly.

Fourth, the outer cover 140 may be formed by attaching the first guider 135 of the first lifting guider 130 to the first inner guide groove 125 of the inner column 120, as shown in FIGS. 1 to 6 and 9 A first mounting through hole 141 corresponding to the first through hole 111 is formed in the upper surface of the outer column 110. The first mounting through hole 141 corresponds to the first through hole 111, Thereby forming a first fixed mounting ring 143 which is bolted to the upper surface of the outer column 110.

A first mounting groove 145 is formed in the lower portion of the first stationary mounting ring 143 so as to correspond to the first external guide groove 115 and is fastened with a first latching protrusion 131 The first guider 135 of the first lifting guider 130 is guided to the first inner guide groove 125 by the first mounting groove 145 into which the first guiding jaw 131 is fitted and fixed. Thereby maintaining a close contact state.

A first fitting protrusion 149 for fixing the first lifting guider 130 to the upper portion of the outer column 110 by covering the first lifting guider 130 on the upper portion of the first fixing fitting ring 143, The first fitting protrusion 149 is formed to be fitted into the first inner guide groove 125 of the inner column 120. According to this configuration, Since the cover 140 is bolted to the outer column 110 in a state in which the upper surface of the first lifting guider 130 is completely covered with the first lifting guider 130 to firmly press the first lifting guider 130, 120 are prevented from being damaged or broken due to disengagement of the first lifting guider 130.

The outer cover 140 may further include a groove 147 corresponding to the second outer guide groove 117 on the outer side of the first fixed mounting ring 143 so that the shape of the outer cover 140 is the same as that of the outer column 110 .

Fifth, the second lifting guider 150 is fixed to the lower portion of the inner column 120 to guide the lifting operation of the inner column 120, as shown in FIGS. 2 to 6 and 8, A first engaging protrusion 151 formed on the lower surface of the inner column 120 and a first outer guide groove 115 and a first inner guide groove 125 integrally formed in a direction perpendicular to the second engaging jaw 151, And a second guider (155) sandwiched between the first guider (155) and the second guider (155).

One surface of the second guider 155 is fixed to the inner surface of the outer column 110 where the first outer guide groove 115 is formed by the inner cover 160, And a second lubricant groove 157 filled with a lubricant is further provided on one surface of the second guider 155 closely attached to the first external guide groove 115 So that the lifting operation of the inner column 120 can be performed more smoothly.

The inner cover 160 may be formed by attaching the second guider 155 of the second lift guider 150 to the first outer guide groove 115 of the outer column 110 as shown in FIGS. And the second lift guider 150 is firmly fixed to the lower portion of the inner column 120 while closely contacting the second through hole 121. The second through hole 161 To form a second stationary mounting ring 163 that is seated on the lower surface of the inner column 120.

In addition, a second mounting groove 165 is formed on the upper outer side of the second stationary mounting ring 163 to correspond to the first inner guide groove 125 and to receive and fix the second receiving step 151 The second guider 155 of the second lifting guider 150 is guided to the first outer guide groove 115 by the second mounting groove 165 into which the second guiding jaw 151 is fitted and fixed. Thereby maintaining a close contact state.

A second fitting protrusion 169 for fixing the second lifting guider 150 to the lower portion of the inner column 120 by covering the second lifting guider 150 on the outer side of the upper portion of the second fixed mounting ring 163, The second fitting protrusion 169 is configured to fit into the first outer guide groove 115 of the outer column 110. According to this configuration, The cover 160 is bolted to the inner column 120 while completely covering the lower surface of the second lifting guider 150 so as to firmly press the second lifting guider 150, 120 are prevented from being damaged or broken due to the detachment of the second lifting guider 150.

The second fixed mounting ring 163 further includes a groove 167 corresponding to the second inner guide groove 127 of the inner column 120 so that the inner side of the inner cover 160 It is preferable to form it in the same manner as the column 120.

The elevating means 3 connected between the lower plate 1 and the upper plate 2 and performing the elevating operation of the internal column 120 inserted into the external column 110 is connected to the lower plate 1 through the bracket, A motor 3b integrally formed with the body 3a and a motor 3b slidably coupled to the body 3a to move the upper plate 2 up and down according to the driving of the motor 3b, The elevating rod 3c and the upper plate 2 can be easily assembled with the elevating rod 3c by operating the elevating rod 3c. .

Hereinafter, the operation according to the preferred configuration of the present invention will be described.

First, when the lifting rod 3c lifts and moves the upper plate 2 in accordance with the operation of the lifting means 3, the inner column 120 connected to the upper plate 2 by bolts is connected to the first and second lifting guider (130, 150) to adjust the height.

When the inner column 120 is moved up and down as described above, the first lifting guider 125 tightly attached to the first inner guide groove 125 of the inner column 120 while being fixed to the upper portion of the outer column 110, The inner column 11 and the inner column 120 are fixed by the second lift guider 150 tightly attached to the first outer guide groove 115 of the outer column 110 while being fixed to the lower portion of the inner column 120 and the inner column 120, 120 are supported, so that no vibration occurs due to the lifting operation of the internal column 120, so that vibration and noise are not generated.

Since the lifting and lowering of the inner column 120 is performed smoothly and safely by the lubricant filled in the first and second lubricating grooves 137 and 157 of the first and second lifting guiders 130 and 150, It is possible to prevent breakdown or breakage of the apparatus according to the present invention.

In addition, the components of the present invention can be easily manufactured only by injection molding, and the first and second lifting guiders 130 and 150 are disposed in a state where the inner column 120 is inserted into the outer column 110 The outer cover 140 is bolted to the upper surface of the outer column 110 on the upper part of the first lifting guider 130 and the inner cover 160 is fixed to the inner column 120, the assembly and the installation can be easily accomplished, so that the installation cost can be reduced.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

A first outer guide groove, a second outer guide groove, and a second outer guide groove,
120: inner column 121: second through-hole 123: inner frame 125: first inner guide groove 127: second inner guide groove
130: first lifting guider 131: first engaging jaw 135: first guider 137: first lubrication groove
140: outer cover 141,: first installation through hole 143: first fixed installation ring 145: first installation groove 149: first fitting projection
150: second lifting guider 151: second lifting jaw 155: second guider 157: second lubrication groove
160: inner cover 161: first installation through hole 163: second fixed installation ring 165: second installation groove 169: second fitting projection
100: Electric lift column

Claims (5)

An electric lift column installed between a lower plate and an upper plate, the height of the lift column being adjustable through the operation of the elevating means,
A hollow outer frame 113 forming a first through hole 111 in a vertical direction, a first outer guide groove 115 formed in the vertical direction inside the outer frame 113, An outer column 110 constituting a second outer guide groove 117 formed in the vertical direction on the outer side of the outer cylinder 113;
A hollow inner frame 123 inserted into the outer frame 113 by forming a second through hole 121 in the vertical direction and a hollow inner frame 123 inserted into the inner frame 123 to correspond to the first outer guide groove 115 An inner column 120 constituting a first inner guide groove 125 formed on the outer side in the vertical direction and a second inner guide groove 127 formed in the vertical direction on the inner side of the inner frame 123;
A first engaging protrusion 131 which is engaged with an upper surface of the outer column 110 and a first outer guide groove 115 and a first inner guide groove 125 which are integrally formed in a direction perpendicular to the first engaging jaw 131, And a first guider (135) sandwiched between the first guiding guider (130) and the first guider (135).
A first fixing installation ring 143 formed on the upper surface of the outer column 110 by forming a first installation through hole 141 corresponding to the first through hole 111, A first mounting groove 145 formed inside the lower portion of the first fixed mounting ring 143 so as to correspond to the first elevating guider 130, The first fitting protrusion 149 protrudes from the upper portion of the first fixing ring 145 and is fitted into the first inner guide groove 125 of the inner column 120, An outer cover 140 for fixing the first lift guider 130 to the outer column 110 in a state of being in tight contact with the first inner guide groove 125 of the inner column 120;
A second engaging jaw 151 which is engaged with a lower surface of the inner column 120 and a first outer guide groove 115 and a first inner guide groove 125 which are integrally formed in a direction perpendicular to the second engaging jaw 151, And a second guider (155) sandwiched between the first guider (150) and the second guider (150).
A second fixing installation ring 163 formed on the lower surface of the inner column 120 by forming a second installation through hole 161 corresponding to the second through hole 121, A second mounting groove 165 formed outside the upper portion of the second fixed mounting ring 163 to correspond to the first elevating guide 150 and the second elevating guide 150 to cover the second elevating guide 150, The second fitting protrusion 169 protruding from the lower outer side of the second fixing ring 163 and fitted in the first outer guide groove 115 of the outer column 110 constitutes the second guider 155 And an inner cover 160 for fixing the second lift guider 150 to the inner column 120 in a state of being in tight contact with the first outer guide groove 115 of the outer column 110. [ column.
The method of claim 1, wherein the outer column (110) and the inner column (120)
The first and second outer guide grooves 115 and 117 and the first and second inner guide grooves 125 and 127 are formed in a rectangular shape with one or two outer surfaces 110 and inner surfaces 120, Wherein the first and second plates are formed on the first and second plates.
2. The connector according to claim 1, wherein the first and second through-hole (111, 121) have four hollow holes (111a, 121a) formed through the upper and lower sides, And wherein the hollow hole (111a) and the through hole (111b) are symmetrically formed in front, back, left, and right directions.
The first guider (135) of the first lift guider (130) further includes a first lubrication groove (137) filled with a lubricant on a surface of the first guider (135) Respectively,
The second guider (155) of the second lifting guider (150) further includes a second lubrication groove (157) filled with lubricant on a surface of the second guider (150) which is in close contact with the first outside guide groove (115) Electric lift column.
The motorized lift column of claim 1, wherein the inner column (120) is formed in multiple stages to have a telescopic shape.
KR1020150100532A 2015-07-15 2015-07-15 The automotive lift column KR101601931B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150100532A KR101601931B1 (en) 2015-07-15 2015-07-15 The automotive lift column

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Application Number Priority Date Filing Date Title
KR1020150100532A KR101601931B1 (en) 2015-07-15 2015-07-15 The automotive lift column

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KR101601931B1 true KR101601931B1 (en) 2016-03-10

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KR1020150100532A KR101601931B1 (en) 2015-07-15 2015-07-15 The automotive lift column

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101006695B1 (en) 2010-03-11 2011-01-10 주식회사 지엔에스모션 Automotive lift column
KR101027274B1 (en) * 2010-10-13 2011-04-06 이정기 Plural step type electric lift
KR101057415B1 (en) * 2010-12-07 2011-08-17 임영문 Pipe type multi - step lifter
KR101452418B1 (en) * 2012-08-17 2014-10-23 오승훈 Multi-level cylinder device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101006695B1 (en) 2010-03-11 2011-01-10 주식회사 지엔에스모션 Automotive lift column
KR101027274B1 (en) * 2010-10-13 2011-04-06 이정기 Plural step type electric lift
KR101057415B1 (en) * 2010-12-07 2011-08-17 임영문 Pipe type multi - step lifter
KR101452418B1 (en) * 2012-08-17 2014-10-23 오승훈 Multi-level cylinder device

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