JP2024089428A - Top plate lifting device - Google Patents

Abstract

To provide a top plate lifting device suppressing rolling, as compared to the conventional technique, only by adding minimum reinforcing members to upper parts of leg parts of a top plate lifting device.SOLUTION: A reinforcing plate includes: reinforcing plate covers respectively provided on a left leg and a right leg, and covering upper-end front lateral faces or upper-end back lateral faces of a front side or a back side of the left leg and the right leg; and reinforcing plate protrusions protruding to a center side in a horizontal direction. The reinforcing plate is fixed to the upper-end front lateral faces and upper-end back lateral faces of the left leg and the right leg. A tie plate is fastened together with the reinforcing plate covers and fastened to the reinforcing plate protrusions to connect the left leg and the right leg and is attached to the lower surface of the top plate.SELECTED DRAWING: Figure 4A

Description

The present invention relates to a tabletop lifting device such as a lift desk or a lift table.

When the height of the top of a height-adjustable desk is increased, the center of gravity becomes higher, and generally the lateral swaying tends to increase. That is, as shown in FIG. 7(A), when the top 110 becomes higher, the legs 130L and 130R become longer. Therefore, when an external force is applied to the top 110, stress is generated in the direction in which the top 110 falls to the left and right. Here, as shown in FIG. 7(B), if the rigidity of the connection part between the legs 130L and 130R and the top 110 is low, the top 110 will sway to the left and right together with the legs 130L and 130R due to the stress acting in the direction in which the top 110 falls to the left and right. Therefore, the angle formed by the legs 130L and 130R and the top 110 cannot be maintained at a right angle, and the left and right legs 130L and 130R and the top 110 will deform into a parallelogram shape, making it difficult for the user to work stably on the top 110.

To prevent this lateral shaking, conventional measures have been taken to make the height-adjustable desk have a strong frame structure or to provide link members and guide members on the height-adjustable desk.

Patent document 1 describes an invention in which link members and guide members are provided at the bottom of the legs of the tabletop in order to prevent the tabletop lift from shaking sideways.

JP 2011-222 A

However, conventional countermeasures to prevent lateral shaking involve adding large, heavy reinforcing members to height-adjustable desks, or modifying the structure to make them large and heavy. This not only increases the cost of height-adjustable desks, but also results in larger and heavier desks due to the larger projected area of the legs.

On the other hand, in recent years, there has been a demand for simple and lightweight desks with adjustable tops. Conventional anti-sway measures that involve adding large and heavy reinforcing members or making large and heavy structural modifications cannot meet such market demands. Furthermore, desks with adjustable tops are constructed with the lifting mechanism located at the center and bottom of the legs. This means that there is a restriction that it is not possible to implement anti-sway measures such as protruding screws or the like from the center and bottom of the legs. There is also a restriction that it is not possible to implement anti-sway measures such as providing a connecting member that connects the left and right legs at a center and bottom position to avoid interference with the user's feet or from a design standpoint.

Therefore, the objective of the present invention is to make it possible to suppress lateral shaking by simply adding a minimal amount of reinforcement material to the upper part of the legs of the height-adjustable desk, compared to conventional technology.

The first invention is a tabletop lifting device that includes a left leg and a right leg that are arranged on the left and right sides of the underside of a tabletop and are configured so that the movable legs move up and down relative to the fixed legs by a lifting mechanism, a reinforcing plate cover that is provided on each of the left and right legs and covers the front and rear side surfaces of the upper ends of the left and right legs on the front or rear sides, a reinforcing plate that has a reinforcing plate protrusion that protrudes toward the center in the left-right direction and is fixed to the front and rear side surfaces of the upper ends of the left and right legs, and a tie plate that is fastened together with the reinforcing plate cover and is fastened to the reinforcing plate protrusion, thereby connecting the left and right legs and attached to the underside of the tabletop.

The second invention is a tabletop lifting device according to the first invention, in which the lifting mechanism includes a lifting and lowering synchronization shaft member that is spanned between the inner side surface of the upper end of the left leg and the inner side surface of the upper end of the right leg.

The third invention is a tabletop lifting device according to the second invention, in which the lifting shaft member is positioned in a position where it is partially or entirely shielded by the tie plate and the reinforcing plate when viewed from the front or back of the tabletop lifting device.

The fourth invention is a tabletop lifting device according to the first invention, in which the lifting mechanism includes a lifting drive motor arranged on the inner side surface of the upper end of the left leg or the inner side surface of the upper end of the right leg.

The fifth invention is a tabletop lifting device according to the fourth invention, in which the lifting drive motor is positioned in a position where it is partially or entirely shielded by the tie plate and the reinforcing plate when viewed from the front or back of the tabletop lifting device.

The sixth invention is a tabletop lifting device according to the first to fifth inventions, which includes a bracket provided on each of the left and right legs, supporting the outer side surfaces of the upper ends of the left and right legs, and attached to the tabletop.

According to the first aspect, lateral shaking can be suppressed by simply adding a minimum amount of reinforcing members to the tops of the left and right legs of the tabletop lifting device. According to the second aspect, the reinforcing members can be positioned without interfering with the lifting shaft members. According to the third aspect, it is possible to prevent the user from accidentally touching the lifting shaft members. According to the fourth aspect, the reinforcing members can be positioned without interfering with the lifting drive motor. According to the fifth aspect, it is possible to prevent the user from accidentally touching the lifting drive motor. According to the sixth aspect, it is possible to suppress lateral shaking even more than the first aspect.

FIG. 1 is a front view of a height adjustable desk according to an embodiment. FIG. 2 is a rear view of the lift-up desk according to the embodiment. FIG. 3 is a right side view of the height adjustable desk according to the embodiment, as viewed from the right side. FIG. 4A is a perspective view of the right lower part of the sit-to-stand desk as viewed obliquely from the front right. FIG. 4B is a perspective view of the right lower part of the sit-to-stand desk as viewed obliquely from the front left. FIG. 4C is a perspective view of the lower right part of the sit-to-stand desk as viewed obliquely from the rear left. FIG. 4D is a perspective view showing the state in which the lift mechanism has been removed, showing the lower right part of the lift desk as viewed obliquely from the rear left. FIG. 5 is a perspective view illustrating a method for fixing the right leg, the reinforcing plate, and the tie plate. FIG. 6A is a diagram illustrating a modified example of the reinforcing plate. FIG. 6B is a diagram illustrating a modified example of the reinforcing plate. 7A and 7B are diagrams illustrating lateral oscillation.

Below, an embodiment of the tabletop lifting device according to the present invention will be described with reference to the drawings.

Tabletop-lifting devices include any device with a tabletop that can be raised or lowered, such as a height-adjustable desk or table.

Below, we will explain an embodiment in which the tabletop lifting device is a lifting desk.

Figure 1 shows a front view of the lift-up desk 100 of the embodiment. Figure 2 shows a rear view of the lift-up desk 100 of the embodiment. The front side is the side of the front user. The rear side is the back side as seen from the front user. Figure 3 shows a right side view of the lift-up desk 100 of the embodiment as seen from the right side. Note that the left side of the lift-up desk 100 is symmetrical to the right side.

Figure 4A is a perspective view of the lower right part of the lift-up desk 100, as viewed from the front right diagonal direction. Figure 4B is a perspective view of the lower right part of the lift-up desk 100, as viewed from the front left diagonal direction. Figure 4C is a perspective view of the lower right part of the lift-up desk 100, as viewed from the rear left diagonal direction. Figure 4D is a perspective view of the lower right part of the lift-up desk 100, as viewed from the rear left diagonal direction, showing the state with the lift-up mechanism unit 120 removed. Figure 5 is a perspective view explaining the method of fixing the right leg, the reinforcing plate, and the tie plate.

The lift desk 100 includes a top plate 110, a lift mechanism 120, a left leg 130L and a right leg 130R, a reinforcing plate 140, a tie plate 150, and a bracket 160.

The top plate 110 has a predetermined thickness and is formed into a rectangular shape when viewed from above.

A lifting mechanism 120 is disposed under the top plate 110. The lifting mechanism 120 includes a shaft member 121 for lifting synchronization, a lifting drive motor 122, and an internal leg mechanism 123.

The left leg 130L and the right leg 130R are respectively located on the lower left and lower right sides of the tabletop 110. The left leg 130L and the right leg 130R each include a fixed leg 131 on the lower side that is placed on the floor surface, and a movable leg 132 on the upper side that is fitted to the fixed leg 131 by the lifting mechanism 120 so that it can move freely in the vertical direction.

The elevation synchronization shaft member 121 is a member for synchronizing the vertical movement of the movable leg 132 of the left leg 130L with the vertical movement of the movable leg 132 of the right leg 130R to raise and lower the left leg 130L and the right leg 130R to the same elevation height. The elevation synchronization shaft member 121 is formed, for example, of a hexagonal shaft with a hexagonal cross section.

The elevation synchronization shaft member 121 is bridged between the upper end inner side surface 130N of the left leg 130L and the upper end inner side surface 130N of the right leg 130R so that its longitudinal direction is the left-right direction.

The left end 121L of the elevation synchronization shaft member 121 is inserted into an insertion hole 133L formed in the inner side surface 130N of the upper end of the left leg 130L. The left end 121L of the elevation synchronization shaft member 121 is rotatably connected to the internal leg mechanism 123 in the left leg 130L.

Similarly, the right end 121R of the elevation synchronization shaft member 121 is inserted into an insertion hole 133R formed in the inner side surface 130N of the upper end of the right leg 130R. The right end 121R of the elevation synchronization shaft member 121 is rotatably connected to the internal leg mechanism 123 in the right leg 130R.

The lift drive motor 122 is disposed on the inner side surface 130N of the upper end of the right leg 130R. That is, the lift drive motor 122 is provided with a drive force transmission part 122A for transmitting a drive force to the lift synchronization shaft member 121. The drive force transmission part 122A is formed with a fitting hole 122H that corresponds to the cross-sectional shape (hexagon) of the lift synchronization shaft member 121. The lift synchronization shaft member 121 is fitted rotatably into the fitting hole 122H of the drive force transmission part 122A.

The mount 122M of the lift drive motor 122 is fastened to the inner side surface 130N of the upper end of the right leg 130R so as to cover the insertion hole 133R formed in the inner side surface 130N of the upper end of the right leg 130R, and is fixed to the right leg 130R.

The left leg 130L and the right leg 130R are each provided with a reinforcing plate 140. The reinforcing plate 140 is a flat plate having a predetermined thickness, made of a material with a predetermined strength and rigidity, and formed, for example, in an equilateral triangular shape.

The reinforcing plate 140 has a reinforcing plate cover 140A that covers the upper end front side surface 130F of the left leg 130L and the right leg 130R, and a reinforcing plate protrusion 140B that protrudes toward the center in the left-right direction. In the following, the right leg 130R is illustrated as shown in Figure 5, and a method of integrally fixing the right leg 130R, the reinforcing plate 140, and the tie plate 150 will be described. The left leg 130L is fixed in the same manner.

The reinforcing plate cover portion 140A has insertion holes 140C1 and 140C2 for fastening together with the tie plate 150. The reinforcing plate protrusion portion 140B has a screw hole 140D for fastening to the tie plate 150.

The reinforcing plate 140 is fixed by welding to the upper end front side surface 130F of the left leg 130L and the right leg 130R so that its opposite side portion 140T1 coincides with the upper end 130U of the left leg 130L and the right leg 130R, and its adjacent side portion 140T2 coincides with the side end 130S1 of the left leg 130L and the right leg 130R. For example, the reinforcing plate 140 is fixed by welding line W2 and

The left leg 130L and right leg 130R are welded along the weld line W3 along the side edge 130S1 of the upper outer side surface 130T.

The method of fixing the reinforcing plate 140 is not limited to welding, and any fixing means such as rivets or adhesives can be used.

The left leg 130L and the right leg 130R have screw holes 130C1 and 130C2 of the same diameter formed in the upper front side surface 130F at locations corresponding to the screw holes 140C1 and 140C2 of the reinforcing plate 140.

The tie plate 150 is attached to the underside of the tabletop 110 so that its longitudinal direction is the left-right direction. The tie plate 150 is a long member formed with an L-shaped cross section, and includes a tabletop side attachment part 151 and a leg side attachment part 152.

The top plate side mounting portion 151 of the tie plate 150 has an insertion hole 151C formed therein for fastening and fixing to the top plate 110.

In the leg side mounting portion 152 of the tie plate 150, insertion holes 150C1 and 150C2 of the same diameter are formed at locations corresponding to the insertion holes 140C1 and 140C2 of the reinforcing plate 140. In the leg side mounting portion 152 of the tie plate 150, insertion holes 150D of the same diameter are formed at locations corresponding to the screw holes 140D of the reinforcing plate 140.

The tie plate 150 is fastened together with the reinforcing plate cover 140A and is fastened to the reinforcing plate protrusion 140B, thereby connecting the left leg 130L and the right leg 130R. That is, the fastening bolts 171, 172 are inserted through the insertion holes 150C1, 150C2 of the tie plate 150 and the insertion holes 140C1, 140C2 of the reinforcing plate 140, respectively, and screwed into the screw holes 130C1, 130C2 of the left leg 130L and the right leg 130R.

The fastening bolt 173 is inserted through the insertion hole 150D of the tie plate 150 and screwed into the screw hole 140D of the reinforcing plate 140. The reinforcing plate 140 is clamped between the left leg 130L and the right leg 130R and the tie plate 150, and these components are fixed together.

The fastening bolt 174 is inserted through the insertion hole 151C of the top plate side mounting portion 151 of the tie plate 150 and screwed into a screw hole at a corresponding location on the top plate 110. This fixes the tie plate 150 to the bottom of the top plate 110.

The bracket 160 is provided on each of the left leg 130L and the right leg 130R. The bracket 160 is formed with an L-shaped cross section and includes a leg-side support part 161 and a tabletop-side mounting part 162.

The leg side support portion 161 of the bracket 160 is fastened to the outer side surface 130T of the upper ends of the left leg 130L and the right leg 130R. The tabletop side attachment portion 162 of the bracket 160 is fastened to the lower part of the tabletop 110. As a result, the bracket 160 supports the outer side surface 130T of the upper ends of the left leg 130L and the right leg 130R, and the left leg 130L and the right leg 130R are attached and fixed to the tabletop 110 via the bracket 160.

An operation panel 180 is attached to the lower right corner of the front side of the lift-up desk 100 for controlling the lifting and lowering operation of the left leg 130L and right leg 130R by the lifting mechanism unit 120.

The lifting shaft member 121 is positioned so that its entirety is shielded by the tie plate 150 and the reinforcing plate 140 when viewed from the front of the lifting desk 100. The lifting shaft member 121 may be configured so that a portion of it is shielded by the tie plate 150 and the reinforcing plate 140 when viewed from the front of the lifting desk 100.

The lift drive motor 122 is arranged in a position where a part of it is shielded by the tie plate 150 and the reinforcing plate 140 when viewed from the front of the lift desk 100. The lift drive motor 122 may be arranged in a position where the whole of it is shielded by the tie plate 150 and the reinforcing plate 140 when viewed from the front of the lift desk 100.

The shape and size of the reinforcing plate 140 can be selected as desired, and as shown in FIG. 6A, the reinforcing plate 140 may be formed to a size that completely shields the lift drive motor 122. As shown in FIG. 6B, the reinforcing plate 140 may also be formed to have a substantially rectangular shape.

According to the embodiment, the lateral shaking of the lift-up desk 100 can be suppressed by simply adding a minimal reinforcing member, the reinforcing plate 140, to the top of the left and right legs 130L and 130R of the lift-up desk 100.

Furthermore, according to the embodiment, the tie plate 150 is simply fastened to the left leg 130L and the right leg 130R by fastening members via the reinforcing member 140, and the tie plate 150 can be easily separated from the left leg 130L and the right leg 130R by loosening the fastening members. Therefore, the sit-to-stand desk 100 of the embodiment has excellent packability and portability.

Furthermore, according to the embodiment, a reinforcing member called a reinforcing plate 140 can be arranged without interfering with the lifting mechanism 120 (lifting shaft member 121, lifting drive motor 122) arranged under the top plate 110. Therefore, measures to prevent lateral shaking can be implemented without changing the layout of the lifting mechanism 120.

Furthermore, according to the embodiment, all or a part of the lift shaft member 121 is shielded by the tie plate 150 and the reinforcing plate 140 when viewed from the front of the lift desk 100. Also, all or a part of the lift drive motor 122 is shielded by the tie plate 150 and the reinforcing plate 140 when viewed from the front of the lift desk 100. This prevents the user from accidentally touching the lift shaft member 121 or the lift drive motor 122. This prevents the lift shaft member 121 or the lift drive motor 122 from getting caught in the rotating parts, and also prevents dirt from the lift shaft member 121 or the lift drive motor 122 from adhering to the user.

In the embodiment, the reinforcing plate 140 is fixed to the front side surface 130F of the upper end of the left leg 130L and the right leg 130R. However, similar to the embodiment, the reinforcing plate 140 may be fixed to the rear side surface 130G of the upper end of the left leg 130L and the right leg 130R.

In the embodiment, the reinforcing plate 140 is fixed only to the upper end front side surface 130F, but it is also possible to fix the reinforcing plate 140 only to the upper end rear side surface 130G, or to fix the reinforcing plate 140 to both the upper end front side surface 130F and the upper end rear side surface 130G.

In addition, the height-adjustable desk 100 of the embodiment is equipped with a bracket 160, which can further suppress lateral shaking in addition to the effect of suppressing lateral shaking provided by the reinforcing plate 140. However, it is also possible to omit the bracket 160 from the height-adjustable desk 100 of the embodiment.

In the embodiment, a lift-up desk 100 has been described, but the present invention can be applied to a tabletop lift-up device for any purpose, such as a lift-up table, in the same manner as in the embodiment.

Furthermore, the tabletop lifting device of the embodiment can be modified, such as by omitting, adding, changing, or substituting components, within the scope of the claims.

100 Lift-adjustable desk 110 Top plate 120 Lift-adjustable mechanism 130L Left leg 130R Right leg 140 Reinforcement plate 150 Tie plate 160 Bracket

Claims (6)

A left leg and a right leg are disposed on the left and right sides of the underside of the tabletop, respectively, and are configured such that the movable leg moves up and down relative to the fixed leg by a lifting mechanism;
a reinforcing plate covering portion provided on each of the left leg and the right leg, covering the front and rear side surfaces of the upper end portions of the left leg and the right leg on the front or rear side; and a reinforcing plate protruding portion protruding toward the center in the left-right direction, the reinforcing plate being fixed to the front and rear side surfaces of the upper end portions of the left leg and the right leg;
a tie plate attached to the underside of the top plate by being fastened to the reinforcing plate cover portion and to the reinforcing plate protruding portion, thereby connecting the left leg portion and the right leg portion;
A tabletop lifting device equipped with the above. The lifting mechanism includes:
A shaft member for synchronizing elevation is provided between an inner side surface of an upper end of the left leg and an inner side surface of an upper end of the right leg.
The tabletop lifting device according to claim 1 . When viewed from the front or rear of the tabletop lifting device, the lifting shaft member is disposed in a position where it is partially or entirely shielded by the tie plate and the reinforcing plate.
The tabletop lifting device according to claim 2. The lifting mechanism includes:
A lifting drive motor is provided on the inner side surface of the upper end of the left leg or the inner side surface of the upper end of the right leg.
The tabletop lifting device according to claim 1 . When viewed from the front or rear of the tabletop lifting device, the lifting drive motor is disposed in a position where it is partially or entirely shielded by the tie plate and the reinforcing plate.
The tabletop lifting device according to claim 4. a bracket provided on each of the left leg and the right leg, supporting outer side surfaces of upper ends of the left leg and the right leg, and attached to the top plate;
The tabletop lifting device according to any one of claims 1 to 5, comprising: