JP2009212843A - Up-and-down moving stand - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an up-and-down moving stand which secures stability when holding an installation object in the upper side and allows downsizing when holding the object in the lower side. <P>SOLUTION: The up-and-down moving stand 2 includes a leg part 3 which is grounded, a body part 4 which is provided upward from the leg part 3, a holding means 5 for holding a liquid crystal television 1 as an installation object in front of the body part 4, an up-and-down moving means 6 for moving the holding means 5 up and down along to the body part 4, and an extending/retracting means 7 for extending or retracting the leg part 3 in the back-and-forth direction. The extending/retracting means 7 extends the leg part 3 forward when the holding means 5 positions in the upper side, and retracts the leg part 3 when the holding means 5 positions in the lower side. Accordingly, stability is secured when the installation object is held in the upper side, and size reduction is achieved when the object is held in the lower side. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an elevating stand, and more particularly to an elevating stand that raises and lowers an attachment such as a liquid crystal television.

Conventionally, an elevating stand for elevating an attached object such as a television is known (Patent Document 1).
According to such a lift stand, a presentation or the like can be performed with the television raised, and after the presentation or the like is finished, the television can be lowered and moved together with the lift stand to store the television in a warehouse or the like.
US Pat. No. 6,149,253

However, since the television is attached to the front surface of the lift stand, if the television is raised by the lift stand, the position of the center of gravity is increased, and the risk of the lift stand falling to the front where the television is attached increases.
To avoid this, the legs of the lift stand can be extended to the front of the lift stand. However, if the legs are extended too far, the door cannot be passed when the lift stand is moved, or the storage property is poor. There's a problem.
In view of such a problem, the present invention provides an elevating stand that can ensure stability when an object to be attached is held above and can be made compact when held below.

That is, the lifting stand according to the present invention is a lifting stand that lifts and lowers an attachment such as a liquid crystal television,
A leg portion to be grounded, a main body portion provided above the leg portion, a holding means for holding the attachment object on the front surface of the main body portion, and an elevating means for moving the holding means up and down along the main body portion And stretching means for expanding and contracting the leg portion in the front-rear direction,
The expansion / contraction means is characterized in that when the holding means is positioned above, the leg is extended at least forward, and when the holding means is positioned below, the leg is contracted.

According to the present invention, even if the object to be attached is held upward by the holding means, the leg portion extends forward at that time, so that the lifting stand can be prevented from falling forward as much as possible. The stability of the lifting stand can be ensured.
On the other hand, when the holding means is located below and the object to be attached is located below, the center of gravity is lowered, so that the stability of the lifting stand can be ensured even if the legs are shortened, and the legs can be shortened. It becomes compact and easy to move and store.

1 to 4 show a lift stand 2 that lifts and holds a liquid crystal television 1 as an attachment, FIG. 1 is a perspective view, FIG. 2 is a front view, and FIG. FIG. 4 shows a side view, and FIG. 4 shows a diagram showing the process of raising and lowering.
Here, the lifting stand 2 shown in FIG. 1 positions the liquid crystal television 1 at the height of the interlock start position described later, and the lifting stand 2 shown in FIGS. 2 and 3 places the liquid crystal television 1 at the height of the rising end. It is located. In the following description, the position where the liquid crystal television 1 is provided is referred to as the front of the lifting stand 2.
The lifting stand 2 includes a grounded leg 3, a main body 4 provided in the vertical direction, a holding means 5 for holding the liquid crystal television 1 on the front surface of the main body 4, and the holding means 5 for the main body 4. Elevating means 6 for elevating and lowering and extending and contracting means 7 for extending and retracting the leg portion 3 in the front-rear direction.
In the lifting stand 2 of the present embodiment, when the holding means 5 is lifted and lowered by the lifting means 6, the expansion and contraction means 7 is extended and contracted in conjunction with this, specifically, When the liquid crystal television 1 is raised to the ascending end, the leg portion 3 is in the extended state shown in FIG. 3, and when the liquid crystal television 1 is lowered to the descending end, the leg portion 3 is in the contracted state shown in FIG. It has become.
Further, the elevating stand 2 has a structure that can be easily disassembled as will be described later, and is configured to be easily transported in the disassembled state.

As shown in FIG. 2, the leg portion 3 includes a holding frame 11 provided in the main body portion 4, an outer cylinder portion 12 provided at both left and right ends of the holding frame 11, and an inside of the outer cylinder portion 12. The inner cylinder part 13 provided so that it can protrude and retract, and the caster 14 provided in the rear end of each outer cylinder part 12, and the front-end | tip of the inner cylinder part 13 are comprised.
The holding frame 11 has a structure in which the main body 4 is fixed at the center by bolts 11a, and the leg 3 and the main body 4 can be easily connected. The holding frame 11 holds the outer cylinder portion 12 with such a width that the elevating stand 2 does not fall to the left or right even when the liquid crystal television 1 is positioned at the rising end.
The outer cylinder portion 12 is provided in the front-rear direction of the elevating stand, the rear end thereof is located behind the main body portion 4, and the caster 14 is provided below the rear end.
The inner cylinder portion 13 is slidably provided inside the outer cylinder portion 12, and the inner cylinder portion 13 extends forward with respect to the outer cylinder portion 12, and the inner cylinder portion 13 is the outer cylinder. The caster 14 is provided at the distal end of the inner cylinder part 13 so as to switch to the contracted state housed in the part 12.
The two inner cylinder portions 13 are connected by a connecting member 15 provided in the left-right direction. Specifically, a through hole is formed in the lower surface of the outer cylinder portion 12 and the lower surface of the inner cylinder portion 13 is formed. And the upper surface of the connecting member 15 are connected by bolts and nuts 16 so as to pass through the through holes.
For this reason, in the extended state in which the inner cylinder part 13 protrudes from the outer cylinder part 12, the connection member 15 is positioned forward, and in the contracted state, the connection member 15 is positioned rearward.

The body portion 4 is fixed to the holding frame 11 of the leg portion 3 and is erected upward. The back surface portion 4a provided at the rear and the left and right side surface portions 4b adjacent to the back surface portion 4a. And two front portions 4c formed inwardly by a predetermined width from the front end portion of the side surface portion 4b.
As will be described later, a roller 24 provided on the holding means 5 comes into contact with the inner peripheral surfaces of the left and right end portions of the back surface portion 4a and the inner peripheral surface of the front portion 4c. It is designed to guide the lifting and lowering.

The holding means 5 includes a mounting frame 21 that fixes the liquid crystal television 1 from the back, a lifting frame 22 that lifts and lowers the inside of the main body 4, and a tray 23 that is provided below the mounting frame 21. ing.
The elevating frame 22 is a cylindrical member having a substantially rectangular cross section that can elevate and lower the inside of the main body 4, and the elevating frame 22 and the mounting frame 21 are between two front portions 4 c of the main body 4. Are connected and fixed so as to pass through.
The mounting frame 21 and the elevating frame 22 are connected by bolts 21a and can be divided during transportation. The elevating frame 22 is transported in a state of being housed inside the main body 4. It is possible to do.
Further, four rollers 24 are provided on each of the left and right side surfaces of the elevating frame 22, and the two rollers 24 located on the rear side on one side surface are in contact with the back surface portion 4a of the main body portion 4 and forward. The two rollers 24 positioned are in contact with the front part 4c.
Further, the elevating frame 22 is provided with a first cam follower 25 and a second cam follower 26 as contact members below the roller 24, and the first cam follower 25 is located behind the elevating frame 22, The two cam followers 26 are located in front of the first cam followers 25 and located below the first cam followers 25.
An elevating member 33 constituting the elevating means 6 is connected and fixed inside the elevating frame 22, and the entire holding means 5 is raised and lowered as the elevating member 33 is raised and lowered.
The tray 23 is provided so as to protrude forward from the lower side of the liquid crystal television 1, and on this tray 23, documents, notebook computers, etc. used for presentation can be placed.

The elevating means 6 includes a screw gear 31 provided in the vertical direction inside the main body 4, a motor 32 for rotating the screw gear 31, and elevating of the holding means 5 that elevates as the screw gear 31 rotates. The elevating member 33 is fixed to the frame 22.
The lower end of the screw gear 31 is rotatably connected to the lower portion of the main body portion 4, and the upper end is set in accordance with the position of the elevating member 33 when the holding means 5 is located at the rising end.
The motor 32 is supplied with electric power from a power source (not shown) and is controlled by a controller (not shown). The motor 32 is set so as not to rotate any more when the elevating member 33 is positioned at the rising end or the lowering end.
The controller is operated manually, and for example, the motor 32 rotates and raises and lowers the elevating member 33 only while a switch for instructing ascending or descending is being pressed.
It is also possible to set the controller so that the liquid crystal television 1 moves to the ascending or descending end once the ascending or descending switch is pressed.

The expansion / contraction means 7 includes a gas spring 41 as an urging means for urging the inner cylinder portion 13 of the leg portion 3 forward with respect to the outer cylinder portion 12, and an inner portion in conjunction with the lowering of the elevating means 6. It is comprised from the link member 42 which moves the cylinder part 13 back.
The gas spring 41 has a rear end connected to a rear end portion inside the outer cylinder portion 12 and a front end connected to the inner cylinder portion 13, and always urges the inner cylinder portion 13 forward. It is like that.
The link member 42 is a member having a substantially rectangular shape, and an upper end thereof is pivotally supported around a rotation shaft 43 provided on the side surface portion 4b of the main body portion 4, and a lower end thereof is the inner cylinder. The connecting member 15 connected to the part 13 is pivotally supported at the rear end of the connecting member 15.
The rotating shaft 43 is located rearward of the first cam follower 25 of the holding means 5, and when the liquid crystal television 1 shown in FIG. The first and second cam followers 25 and 26 are positioned above the portion 4 so as to cross from the rear to the front.
When the holding means 5 is lowered from the state shown in FIG. 3 and the first and second cam followers 25 and 26 come into contact with each other from above and press the link member 42 downward, the link member 42 rotates around the rotation shaft 43. Accordingly, since the lower end of the link member 42 moves rearward, the connecting member 15 and the inner cylinder portion 13 move rearward against the urging force of the gas spring 41. (See FIG. 4 (c)).

The operation of the lifting stand 2 having the above configuration will be described. Here, a description will be given from the state where the liquid crystal television 1 shown in FIG. 3 is positioned at the rising end to the lowering end shown in FIG. 4 (c) through the states shown in FIGS. 4 (a) and 4 (b).
First, in FIG. 3, the elevating member 33 of the elevating means 6 is located at the upper end of the screw gear 31, the holding frame 11 of the holding means 5 is located at the elevating end with respect to the main body 4, and the liquid crystal television 1 is Located at the rising edge.
On the other hand, the leg part 3 has the inner cylinder part 13 biased forward by a gas spring 41 constituting the expansion / contraction means 7, and the inner cylinder part 13 is in an extended state in which it protrudes most forward from the outer cylinder part 12. ing.
By setting the leg part 3 in the extended state, the caster 24 provided in the inner cylinder part 13 is moved forward with respect to the liquid crystal television 1, and the distance between the outer cylinder part 12 and the caster 14 is increased.
For this reason, even if the position of the center of gravity of the entire lift stand 2 including the liquid crystal television 1 is increased when the liquid crystal television 1 is located at the rising end, the liquid crystal stand 2 is prevented from falling forward as much as possible. Can do.
At this time, the first and second cam followers 25 and 26 of the holding means 5 are not in contact with the link member 42 constituting the expansion / contraction means 7, and a pressing force from above acts on the link member 42. Not.

From this state, when the user performs an operation of lowering the liquid crystal television 1 using a controller (not shown), the motor 32 rotates the screw gear 31, and accordingly, the elevating member 33 is lowered to fix the elevating member 33. The holding means 5 and the liquid crystal television 1 are lowered through the holding frame 11 to be moved.
FIG. 4A shows the interlock start position where the second cam follower 26 provided on the holding frame 11 comes into contact with the link member 42 from above when the holding means 5 is lowered, and after this interlock start position, the link member 42 is shown. A pressing force is applied to the top from above.
In other words, since the link member 42 does not rotate from the rising end of FIG. 3 until it is located at the interlock start position of FIG. 4A, the connecting member 15 connected to the link member 42 does not retreat, Since the leg part 3 maintains the said extended state, stability of the raising / lowering stand 2 is ensured.

FIG. 4B shows a state where the holding means 5 is further lowered from the state of FIG. 4A and the second cam follower 26 and the first cam follower 25 are in contact with the link member 42.
During the period from FIG. 4A to FIG. 4B, the second cam follower 26 presses the link member 42 downward as the holding means 5 descends. It rotates around the rotating shaft 43.
As a result, the lower end portion of the link member 42 moves rearward and the connecting member 15 moves backward, and accordingly, the inner cylinder portion 13 starts moving backward against the urging force of the gas spring 41.
Then, when the link member 42 is rotated to some extent by the lowering of the second cam follower 26, the first cam follower 25 comes into contact with the link member 42 from above as shown in FIG. 4B.
Here, by providing the second cam follower 26 and bringing it into contact with the link member 42 from the second cam follower 26, the second cam follower 26 as a force point first contacts with a position far from the rotation shaft 43 as a fulcrum. The link member 42 can be rotated with less force, and the load on the first cam follower 25 can be reduced.

FIG. 4C shows a state in which the liquid crystal television 1 has reached the descending end, and the holding means 5 descends until the first cam follower is moved from FIG. 4B to FIG. 4C. 25, the link member 42 is pressed downward.
Here, if the square-shaped link member 42 is rotated, the lower end portion of the link member 42 protrudes rearward of the main body portion 4, so that the link member 42 is provided on the back surface portion 4 a of the main body portion 4. A slit is formed for passing the.
When the holding means 5 is lowered to the descending end, the connecting member 15 is moved to the retracted end by the link member 42, whereby the inner cylindrical portion 13 is accommodated in the outer cylindrical portion 12, and the leg portion 3 is in the contracted state. Become.
Then, when the leg portion 3 is in the contracted state, the distance between the caster 14 of the outer tube portion 12 and the caster 14 of the inner tube portion 13 is narrowed, and the total length of the outer tube portion 12 and the inner tube portion 13 in the contracted state. Is set shorter than the width of the door of the conference room or the like, the liquid crystal television 1 can be carried out from the door of the conference room together with the lift stand 2 and can be stored compactly in a warehouse or the like.
On the other hand, when the liquid crystal television 1 is lowered to the lower end, the position of the center of gravity of the entire lifting stand 2 including the liquid crystal television 1 is lowered, so that the liquid crystal stand 2 falls forward even if the leg 3 is in a contracted state. Can be prevented as much as possible.

Next, an operation from the state in which the liquid crystal television 1 in FIG. 4C is located at the lower end to the time when the liquid crystal television 1 in FIG. 3 is located at the upper end will be described.
First, in the state of FIG. 4C, the gas spring 41 provided in the outer cylinder portion 12 urges the inner cylinder portion 13 forward, but the link member 42 is pressed from above by the first cam follower 25. Therefore, the connecting member 15 is located rearward and the leg portion 3 is maintained in a contracted state.
When the holding means 5 is raised by the elevating means 6 from this state, the gas spring 41 urges the connecting member 15 forward via the inner cylinder portion 13, so that the link member 42 is connected to the first cam follower 25. The inner cylinder part 13 moves forward with respect to the outer cylinder part 12 as it moves upward.
When the holding means 5 rises to the state shown in FIG. 4B, the second cam follower 26 comes into contact with the link member 42, and then the first cam follower 25 is detached from the link member 42 and the link member 42. Continues to rotate while maintaining contact with the second cam follower 26 by the biasing force of the gas spring 41, and the inner cylinder portion 13 further advances relative to the outer cylinder portion 12.
When the holding means 5 is raised to the state shown in FIG. 4A, the second cam follower 26 comes out of the link member 42, and the pressing force from above does not act on the link member 42. Due to the urging force of the spring 41, the inner cylinder portion 13 protrudes completely from the outer cylinder portion 12, and the leg portion 3 is in the extended state.
Thereafter, the holding member 5 is raised to the rising end shown in FIG. 3 by the elevating means 6, while the leg portion 3 is maintained in the extended state so as not to extend further.

As described above, according to the lifting / lowering stand 2 of the present embodiment, when the liquid crystal television 1 is raised, the legs 3 are in the extended state, so that the liquid crystal television 1 is positioned upward and the position of the center of gravity is high. Even if it becomes, it can prevent as much as possible that the raising / lowering stand 2 falls forward.
On the other hand, when the liquid crystal television 1 is lowered, the leg 3 is in a contracted state, so that the length of the leg 3 in the front-rear direction is shortened and the lifting stand 2 can be made compact. It can be passed through a door of a room or stored efficiently in a warehouse or the like.
Further, in the present embodiment, the leg portion 3 maintains the extended state until the holding means 5 is lowered from the rising end to the interlock start position, and conversely, until the holding means 5 is raised from the descending end to the interlock start position. Since the leg portion 3 changes from the contracted state to the extended state, the stability is ensured in a state where the liquid crystal television 1 is positioned above the interlock start position and the center of gravity is increased.

Instead of the above embodiment, for example, a screw gear driven by a motor 32 is provided inside the outer cylinder portion 12 as the expansion / contraction means 7, and the inner cylinder portion 13 is moved back and forth with the rotation of the screw gear. Then, the inner cylinder part 13 can be switched from the extended state to the contracted state.
Then, by interlocking the motor 32 of the elevating means 6 and the motor of the extendable means 7, the leg 3 can be expanded and contracted by the extendable means 7 in conjunction with the elevation of the holding means 5.
As a safety measure, sensors are provided in the main body 4 and other parts, and when a person approaches the lifting stand 2 while the liquid crystal television 1 is lifted or a foreign object enters the main body 4, The rotation of the motor 32 may be stopped.

Here, the elevating stand 2 in the above embodiment can pass through the outer cylinder portion 12 and the inner cylinder portion 13 in a contracted state so that the door is wider than the length in the front-rear direction of the leg portion 3 in the contracted state. However, it may be difficult to pass through a door that is narrower than this.
More specifically, when the elevating stand 2 is turned in the horizontal direction, the door is passed from the tip of the inner cylinder part 13 and then the rear end of the outer cylinder part 12 is passed. The inner cylinder portion 13 can pass through the door.
However, as shown in FIG. 4 (c), since the tray 23 in the holding means 5 is located at substantially the same position as the tip of the inner cylinder portion 13 in the contracted state, the tray 23 interferes with the door and passes through the door. I can't let you.
If the tray 23 is not provided, the elevator stand 2 is further pivoted in the horizontal direction to pass the door from the rear end of the outer cylindrical portion 12, and then the tip of the inner cylindrical portion 13 is passed. The cylinder part 12 and the inner cylinder part 13 also pass through the door, and the entire lifting stand 2 passes through the door.
Therefore, the tray 23 in the above embodiment can be attached to and detached from the holding frame 21, can be moved to the left and right with respect to the holding frame 21, or the tray 23 itself can be expanded and contracted in the front-rear direction. Does not interfere with the door, and the lifting stand 2 can pass through even a narrow door.
As a specific example of moving the tray 23 to the left and right with respect to the holding frame 21, the upper end of a support column provided in the vertical direction connecting the tray 23 and the holding frame 21 is hooked, and this hook-shaped portion is used as the holding frame. The structure which engages with the support | pillar provided in the left-right direction in 21 from upper direction can be considered. With this configuration, the tray 23 can be attached to and detached from the holding frame 21.

The perspective view of the raising / lowering stand 2 concerning a present Example. The front view of the raising / lowering stand 2. FIG. It is the side view of the raising / lowering stand 2, Comprising: The figure which showed the state which has located the liquid crystal television 1 in the raising end. It is a figure which shows the action | operation of the raising / lowering stand 2, Comprising: (a) is the state which the 2nd cam follower 26 contacted the link member 42, (b) is the state which the 1st cam follower 25 contacted the link member 42, (c) ) Shows a state where the liquid crystal television 1 is positioned at the lower end.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal television 2 Lift stand 3 Leg part 4 Main body part 5 Holding means 6 Lifting means 7 Telescopic means 12 Outer cylinder part 13 Inner cylinder part 25 1st cam follower 26 2nd cam follower 41 Gas spring 42 Link member 43 Rotating shaft

Claims (5)

An elevating stand that raises and lowers an attachment such as an LCD TV,
A leg portion to be grounded, a main body portion provided above the leg portion, a holding means for holding the attachment object on the front surface of the main body portion, and an elevating means for moving the holding means up and down along the main body portion And stretching means for expanding and contracting the leg portion in the front-rear direction,
The expansion / contraction means is characterized in that when the holding means is located above, the leg is extended at least forward, and when the holding means is located below, the leg is contracted.   The elevating means lowers the holding means along the main body, and when the holding means is lowered to the interlocking start position located between the rising end and the lowering end, the extending means is then interlocked with the lowering of the holding means. The elevating stand according to claim 1, wherein the leg portion is contracted. The leg part is composed of an outer cylinder part fixed to the lower part of the main body part, and an inner cylinder part provided so as to be able to protrude forward and backward from the inside of the outer cylinder part,
The expansion / contraction means includes an urging means for urging the inner cylinder portion toward the front of the main body portion, one end pivotally supported by the main body portion via a rotation shaft, and the other end of the inner cylinder portion. A link member connected to
The holding means includes a contact member that is positioned in front of the rotating shaft and that contacts the link member from above,
In a state in which the abutting member does not press the link member downward, the inner cylindrical portion of the leg portion protrudes from the outer cylindrical portion by the biasing means, and the link member is rotated so as to be positioned forward with respect to the rotation shaft. Moving,
When the elevating means lowers the holding means and the abutting member presses the link member downward, the link member rotates about the rotation shaft, and the inner cylinder portion connected to the other end of the link member The elevating stand according to claim 1 or 2, wherein the elevating stand moves backward, and the inner cylinder part is pulled into the outer cylinder part against the urging force of the urging means. The abutting member includes a first abutting member provided at the rear of the link member on the rotating shaft side, and a first abutting member provided below the first abutting member and ahead of the first abutting member. 2 contact members,
4. When the lifting means lowers the holding means, the second contact member first presses the link member from above, and then the first contact member presses the link member from above. The lifting stand described.   The elevating means includes a screw gear provided in the vertical direction, a motor that rotates the screw gear, and an elevating member that is fixed to the holding means and moves up and down as the screw gear rotates. The elevating stand according to claim 1, wherein the elevating stand is provided.

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