JPH11113641A - Transferable utensil with vertically movable top plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transferable utensil provided with a vertically movable top plate, which can adjust the height of the top plate and the relative level of casters against grounding members fixed at the lower end of legs by the rotary manipulation of a handle and which does not vary the height of the top plate from the floor face even when the casters are driven vertically during the changing motion from the transferable state to the fixed state and vice versa. SOLUTION: A vertically movable structure 3 for a top plate and a drive structure 6 of casters are actuated by the rotation of a handle 7 and a displacement proportional to the revolution number of the handle 7 is brought. In this case, the utensil is provided with an adjusting mode for the top plate, in which the rotary drive force of the handle 7 is transmitted only to at least the vertically movable structure 3 to adjust the height of the top plate 2 by a changeover means 9 provided with a rotary drive structure 8 including the common handle 7, and a sympathizing mode in which the rotary drive force of the handle is simultaneously transmitted to the vertically movable structure 3 and the drive structure 6 of the casters to equalize the displacement of the height of the top plate to the legs with the vertical displacement of the casters 5 and the height of the top plate 2 from the floor face is always kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a furniture with a movable elevating top plate, and more particularly, to adjusting the height of a top plate by rotating a handle on a movable table, desk or the like with casters. The present invention relates to a fixture with a movable top and bottom plate which is immovable during use.

[0002]

2. Description of the Related Art Heretofore, there have been known learning desks capable of adjusting the height of a top plate by rotating a handle, and various kinds of learning desks have been provided. However, it is common knowledge that these learning desks do not need to be moved frequently and are immovable from the viewpoint of safety during use, that is, those that do not have any casters or rollers on the legs. It is.

On the other hand, there is also known a heavy furniture such as a closet having a structure in which a caster or a roller protrudes from a bottom surface by rotating a handle during movement. But,
In this kind of furniture, only the casters are raised and lowered for the purpose of movement, and there is no mechanism for adjusting the height of the furniture.

Further, in a movable table or the like with casters, the height of the top plate can be adjusted by rotating the handle, and the stopper cannot be moved by using the stopper during use. Those are also known.
In this case, as the stopper, a structure in which a grounding member having an adjuster function is projected below a caster fixed to the lower end of the leg, or a structure in which the caster is pulled above the grounding member fixed to the lower end of the leg There are things. Normally, the top plate elevating mechanism and the stopper driving mechanism (caster driving mechanism) are independent, and they are operated using separate handles or levers. Further, it is common to provide three or more casters, and it takes time and effort to operate all the casters. In addition, this is a mechanism that turns the screw-type grounding member so that it can be moved or cannot move. When an OA device or the like is mounted on the top plate, the rotation of the grounding member is heavy and the hands become dirty. was there.

[0005]

In such a movable table, desk, or the like, with a fixture whose top plate can be adjusted in height and cannot be moved during use, the height of the top plate is frequently adjusted. It is conceivable that the furniture is moved, the furniture itself is moved, or a plurality of furnitures are arranged and used. However, the top lifting mechanism and the caster drive mechanism are independent,
In the case of operating using separate handles or levers, it is necessary to change the handle or lever each time when adjusting the height of the top plate and when changing between the movable state and the immovable state. Therefore, not only the operability is poor and the operation is troublesome, but also it is practically impossible to adjust the height of the top plate in a movable state in which the casters protrude below the grounding member.
In other words, even if the height of the top plate is adjusted in a movable state, if the caster is then pulled from the grounding member to make the top plate unmovable, the height of the top plate falls and changes. In particular, when adjusting the height of the top plate of a large number of fixtures to a certain level, move other fixtures so that they are lined up with one reference fixture, pull the caster into an immovable state during use, The height of the plate is adjusted, and thereafter, the casters are protruded to move the furniture to a predetermined position, and complicated operations such as pulling in the caster again at that position are performed.

In view of the above situation, the present invention is intended to solve the problem by adjusting the height of the top plate and rotating the caster relative to the ground member fixed to the lower end of the leg by rotating one handle. It is possible to adjust the target vertical position, and the height of the top plate from the floor surface does not change by the vertical drive of the caster when changing between the movable state and the immovable state. Another object of the present invention is to provide a movable fixture with a lifting top that can adjust the height of the top only.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a caster can be moved up and down with respect to a leg by a top plate elevating mechanism, and a caster is fixed to a lower end of a grounding member fixed to the leg. Is a movable fixture with a movable top and bottom plate that can be moved up and down by a caster drive mechanism, wherein the top plate lift mechanism and the caster drive mechanism are both mechanisms that operate by rotating a handle, and the number of rotations of the handle is A mechanism for creating the same amount of change by adjusting the height of the top plate by transmitting the rotation driving force of the handle only to at least the top lifting mechanism by the switching means provided in the rotation drive mechanism including the common handle. And the height change amount of the top plate with respect to the legs and the vertical change amount of the casters match at the same time by transmitting to the top plate raising / lowering mechanism and the caster drive mechanism at the same time. It constituted the tuning mode and can move can be realized lifting top plate with fixtures to keep the height of the top plate constant.

[0008] The furniture with a movable elevating top plate of the present invention comprises:
In the top plate adjustment mode, it is possible to adjust the height of the top plate in any state of the casters, while in the tuning mode, the casters are projected downward from the grounding member from the immovable state. When changing to the movable state, the downward change amount of the caster and the downward change amount of the top plate with respect to the legs match, and the movable state is changed to the immovable state by pulling the caster upward from the grounding member In this case, the amount of upward change of the caster and the amount of upward change of the top plate with respect to the leg coincide with each other, so that the height of the top plate from the floor surface is kept constant.

Further, in addition to the top plate adjustment mode and the tuning mode, a caster retreat mode in which the switching means transmits the rotational driving force of the handle only to the caster drive mechanism to move the caster up and down with respect to the grounding member is realized. Preferably it is possible. In other words, in the unmovable use state where the caster is located above the grounding member,
Even when the top plate is adjusted to the lowest position, the caster is allowed to protrude below the grounding member to be movable thereafter.

The top plate lifting mechanism and the caster driving mechanism each include a first screw member having a screw shaft and a second screw member having a screw hole for screwing the screw shaft. A mechanism in which one of the screw member and the second screw member is attached to the fixed portion and the other is attached to the movable portion, and driven by the first and second screw members being advanced and retracted, continuously adjusts the height of the top plate. This can be performed, and the adjusted height of the top plate and the set state of the casters can be reliably maintained.

[0011] The switching means includes a driving mechanism in which an engaging claw is axially provided at an end of a driving rotary shaft for transmitting a rotational driving force from the handle, and a driving gear is fixed to a base end side. A rotating body is provided, and the driving rotating body is made movable in the axial direction by an operation lever, and the engaging claw is engaged with the end portion for rotating the screw shaft of the top plate elevating mechanism from the axial direction and rotated. A driven rotating body provided with an engaging recess to be connected,
A driven gear fixed to an end of a driven rotation shaft for rotating a screw shaft of the caster driving mechanism, while being disposed coaxially with the driving rotation member so as to be rotatable at a fixed position in an opposed state, The driving lever is axially displaced by the operation lever so that the engaging claw of the driving rotator engages with the engaging recess of the driven rotator. The top plate adjusting mode in which the driving gear engages with the driven gear and the driving gear does not mesh with the driven gear; and the tuning in which the engaging claw of the driving rotating body engages with the engaging concave portion of the driven rotating body and the driving gear meshes with the driven gear. It is more preferable to have a clutch mechanism capable of switching between a mode and the caster retracting mode in which the engaging claw of the driving rotator does not engage with the engaging recess of the driven rotator and the driving gear meshes with the driven gear. .

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. 1 to 8 show a table as furniture according to the present invention.
Is a top plate, 3 is a top lifting mechanism, 4 is a ground member, 5 is a caster, 6 is a caster drive mechanism, 7 is a handle, 8 is a rotary drive mechanism, 9 is a switching means, and 10 is a clutch mechanism. . In addition, the present invention is not limited to the table,
A desk or other elevating top plate 2 having casters 5
It can be applied to all fixtures that can be moved.

The table according to the present embodiment has a pair of legs 1, 1 in which a lower leg 1A having an inverted T-shape in side view and an upper leg 1B having a T-shape in side view are extendably connected to both sides of the table.
A beam member 11 is provided between the upper ends thereof,
A top plate 2 is provided on the upper surfaces of the upper legs 1B, 1B and the beam member 11.
Has a fixed basic structure. The lower leg 1A constituting the leg portion 1 has a hollow outer leg tube 13 erected in the center of a support member 12 arranged along the floor surface, and the upper leg 1B also constituting the leg portion 1 A hollow inner leg tube 15 is provided at the center of a fixing member 14 for mounting and fixing the top plate 2, and the inner leg tube 15 is connected to the upper half of the outer leg tube 13 via a slide bearing 16. The outer leg tube 13 has a structure in which a cap 17 also serving as a slider is mounted on the upper end of the outer leg tube 13. Further, cylindrical grounding members 4 and 4 are fixed to the lower surfaces of both ends of the support member 12 of the lower leg 1A, and a caster 5 is provided inside the grounding member 4 so as to be vertically movable.

The top plate raising / lowering mechanism 3 is disposed so as to straddle the inside of the outer leg tube 13 and the inside of the inner leg tube 15. The caster driving mechanism 6 is provided between the outer leg tube 13 and the support member. 12
The handle 7 is disposed at the front end of one of the right and left fixing members 14 so as to be detachable or foldable, and the rotation driving mechanism 8 is a fixing member provided with the handle 7. The lever operating mechanism 18 is disposed continuously from the inside 14 to the inside of the inner leg tubes 15 on both sides through the inside of the beam member 11, and the lever operating mechanism 18 constituting the switching means 9 is located at a position close to the fixed member 14 provided with the handle 7. The clutch mechanism 10, which is disposed inside the beam member 11 and also constitutes the switching means 9, is disposed inside the inner leg tube 15.

Here, the top plate elevating mechanism 3 and the caster driving mechanism 6 are both a first screw member 19 having a screw shaft.
And a second screw member 20 having a screw hole into which the screw shaft is screwed. One of the first screw member 19 and the second screw member 20 is attached to a fixed portion, and the other is attached to a movable portion. This is a mechanism in which one of the first screw members 19 is rotated by the rotational driving force of the handle 7 transmitted by the mechanism 8, and the first screw member 19 and the second screw member 20 are driven by advancing and retreating.

Further, according to the present invention, the top plate 2 is
Is a movable table with a movable top and bottom that can be moved up and down by a top plate elevating mechanism 3 and can be moved up and down by a caster driving mechanism 6 with reference to a lower end of a grounding member 4 fixed to the leg 1. The top plate elevating mechanism 3 and the caster driving mechanism 6 are both mechanisms that operate by rotating the handle 7 and that create the same amount of change in the number of rotations of the handle 7, and include a common handle 7. A top plate adjusting mode for adjusting the height of the top plate 2 by transmitting the rotation driving force of the handle 7 to at least only the top plate raising / lowering mechanism 3 by the switching means 9 provided in the rotation driving mechanism 8, 3 and the caster driving mechanism 6 are simultaneously transmitted, so that the height change amount of the top plate 2 with respect to the leg portion 1 and the vertical change amount of the casters 5 match, and the height of the top plate 2 from the floor surface is always kept constant. Mo It is an Abstract that can achieve and de. Further, in addition to the top plate adjustment mode and the tuning mode, the switching means 9 transmits the rotational driving force of the handle 7 only to the caster driving mechanism 6 to move the caster 5 up and down with respect to the grounding member 4. Can be realized.

Hereinafter, each part will be described in more detail. The top plate raising / lowering mechanism 3 has the same one inside the left and right legs 1 and 1, and as shown in FIGS. 2 and 4, a tube portion 21 provided at the center of the inner leg tube 15. A shaft 22 (first screw member 19) is integrally provided at a portion protruding below the inner leg tube 15 so as to be rotatable at a fixed position.
3 is screwed into a screw hole 25 of a support plate 24 (second screw member 20) fixed inside the lower part of the outer leg tube 13, and the lower part of the screw shaft 23 is It extends to the lower end of the tube 13. Here, the screw shaft 23 and the screw hole 25 are formed by right-handed screws. The lower end of the cylindrical portion 21 of the inner leg tube 15 is mounted on a thrust bearing 27 locked on a shoulder portion 26 between the shaft 22 and the screw shaft 23, and a movable portion above the inner leg tube 15. Load. And the shaft 2
2, that is, by rotating the screw shaft 23, the lower leg 1
The screw shaft 23 advances and retreats with respect to the screw hole 25 of the support plate 24 fixed to the outer leg tube 13 of A, and the inner leg tube 15 is slid up and down with respect to the outer leg tube 13, whereby the top plate Adjust the height of 2.

As shown in FIGS. 2 and 4, the caster driving mechanism 6 is provided in a central through hole 29 of a holding plate 28 fixed inside the outer leg tube 13 and below the support plate 24. The rotary cylinder 3 penetrates the rotary cylinder 30 rotatably at a fixed position and extends below the holding plate 28.
A screw shaft 31 (first screw member 19) formed of a male screw formed on the outer periphery of the lower portion of the lower cylinder 0 is attached to an elevating cylinder 32 (second screw member 2).
A screw hole 33 formed of an internal thread formed on the inner periphery of the upper part of (0) is screwed together, and the lower end of the elevating cylinder 32 is disposed along the inside of the support member 12 with a pair of front and rear tilting rods 34, 34. Of the tilting rod 34 is pivotally supported on the support member 12 by a horizontal support shaft 36, and the other end of the tilting rod 34 is connected to the caster 5. It is configured to stop or pivotally attach to the upper end of the shaft portion 37. Here, the screw shaft 31
And the screw hole 33 is formed by a right-handed screw. The screw shaft 23 of the top plate elevating mechanism 3 is loosely inserted coaxially into the rotating cylinder 30 and the elevating cylinder 32. And
By rotating the rotary cylinder 30, the screw hole 33 of the lifting cylinder 32 advances and retreats with respect to the screw shaft 31 of the rotary cylinder 30, and both tilting rods 34, 34 tilt about the support shaft 36. Then, the casters 5, 5 are vertically moved up and down with respect to the ground members 4, 4. That is, when the elevating cylinder 32 is displaced upward, the caster 5 is pushed down to project from the lower end of the grounding member 4.

The rotary cylinder 30 has a flange 38 formed above the holding plate 28, and
The flange portion 38 is mounted on a thrust bearing 39 interposed between the caster 5 and the support plate 28, and supports the entire load applied to the caster 5. The gear 40 formed at the upper end of the rotary cylinder 30 is provided at the lower end of a driven rotary shaft 41 disposed along the shaft 22 and penetrating the support plate 24 so as to be rotatable in a fixed position. The drive gear 6 meshes with the gear 42 and transmits the drive torque transmitted from the clutch mechanism 10 to the caster drive mechanism 6.

The grounding member 4 has an adjuster function. In the present embodiment, the grounding member 4 is a cylindrical member which is screwed to a downwardly open cylindrical portion 43 integrally formed with the support member 12.
Fine adjustment can be made by changing the screwing depth. And, the shaft portion 37 of the caster 5 penetrates a portion corresponding to the upper surface of the cylindrical portion 43 so as to be vertically slidable,
When the caster 5 rises most, the lower end of the caster 5 is housed inside the grounding member 4 on the same plane as or slightly higher than the lower end of the grounding member 4, and the caster 5 is lowered. In this case, the lower end of the caster 5 protrudes below the lower end of the grounding member 4 so that it can move on the floor.

Next, as shown in FIGS. 2 and 5, the rotation drive mechanism 8 includes the handle 7,
The rotational driving force of the top plate lifting mechanism 3 and the caster driving mechanism 6
A switching means 9 for switching between a top plate adjustment mode, a tuning mode, and a caster retracting mode is provided on the way, and the switching means 9 includes a lever operating mechanism 18 and a clutch mechanism 10. First, the rotation drive mechanism 8 other than the switching means 9 will be described. A torque transmission wire 44 extending from the connection portion of the handle 7 to the inside of the beam member 11 through the inside of the fixed member 14 is provided. A gear 45 fixed to the distal end of the torque transmission wire 44 is rotatably held in the beam member 11 in a fixed position, and a shaft assembly 46 is rotatably disposed along the inside of the beam member 11. The gear 45 is meshed with a gear 47 provided on a part of the shaft assembly 46, and torque transmission wires 48, 48 connected to both ends of the shaft assembly 46 are respectively connected to the inner leg tubes 15, 15.
Of the clutch mechanism 1
0 is provided. The lever operating mechanism 18 is provided in the beam member 11 in relation to the shaft assembly 46.

More specifically, the shaft assembly 46
Is the gear 4 disposed on one side of the beam member 11.
7 and a long shaft 50 extending to the other side over substantially the entire length of the beam member 11 and have a structure in which the spline shaft 51 or a polygonal column shaft is used to extend and contract in the axial direction. The shafts 49, 50 are supported by a plurality of bearings 52,... So as to be rotatable and slidable in the axial direction. The torque transmission wires 48 on both sides are connected to shafts 49 and 50, respectively.
The shafts 49 and 50 are vertically displaced in the inner leg cylinders 15 by the axial displacement of the shafts 49 and 50.

Further, the lever operating mechanism 18 is provided as shown in FIG.
As shown in the figure, an operation rod 54 is attached to the beam member 11 in the middle of the shafts 49 and 50 so that the center can be horizontally rotated by a vertical support shaft 53, and both ends of the operation rod 54 are respectively connected. Pins 56, 56 are pivotally attached to ends of arm rods 55, 55, which are rotatably attached to ends of shafts 49, 50, and an operation lever 57 fixed to the operation rod 54 is connected to the beam member 11. When the operating lever 57 is rotated clockwise about the support shaft 53 when the operating lever 57 is exposed forward from an opening 58 formed in the front plate, the shafts 49 and 50 are displaced so as to approach each other. The inner ends of the torque transmission wires 48, 48 are displaced upward. Conversely, when the operation lever 57 is rotated counterclockwise, the two shafts 49 and 50 are displaced away from each other, and thus the torque transmission wire 4 in the inner leg tube 15 is displaced.
The ends of 8,48 are displaced downward. Here, the torque transmission wires 48, 48 are set in three stages of the top plate adjustment mode, the tuning mode, and the caster retreat mode.
It is preferable that the operating rod 54 or the operating lever 57 is positioned by unevenness provided at an appropriate position of the beam member 11 or a locking member attached to the beam member 11 so that the vertical position of the operating member 54 can be set. Even if the shaft 49 is displaced in the axial direction, the gear 45 and the gear 47 always mesh with each other, and the rotational driving force from the handle 7 is applied to the shafts 49 and 5.
The length of the gear 47 in the axial direction is made sufficiently long so that it can be transmitted to the torque transmission wires 48 via the zero.

As shown in FIGS. 2 and 6, the clutch mechanism 10 is connected to an end of a drive rotation shaft 59 connected to a tip of the torque transmission wire 48 for transmitting a rotational drive force from the handle 7. A driving rotator 62 having an engaging claw 60, 60 protruding in the axial direction at the distal end and a driving gear 61 fixed to the proximal end is provided, and the driving rotator 62 is movable in the axial direction by the operation lever 57. No engagement recesses 63, 63 for engaging the engagement claws 60, 60 in the axial direction and rotating and connecting to the shaft 22 of the top plate lifting mechanism 3, that is, the end for rotating the screw shaft 23, are provided. Provided driven rotating body 64
Is disposed coaxially with the driving rotating body 62 so as to be rotatable in a fixed position in an opposed state, and is fixed to an end of the driven rotating shaft 41 for rotating the screw shaft 31 of the caster driving mechanism 6. The gear 65 has a structure in which the gear 65 is arranged parallel to the drive rotating body 62 so as to be rotatable at a fixed position in a side-mounted state. Then, by the axial displacement of the driving rotary body 62 by the operation lever 57, the engaging claw 60 of the driving rotary body 62 is engaged with the engaging recess 63 of the driven rotary body 64, and the driving gear 61 is driven by the driven gear 65. The top plate adjustment mode (see FIG. 6A) that does not mesh with the engaging claw 60 of the driving rotary body 62
Is engaged with the engaging recess 63 of the driven rotating body 64 and the driving gear 61 is meshed with the driven gear 65 in the tuning mode (FIG. 6).
(b)) and the caster retracting mode in which the engaging claw 60 of the driving rotating body 62 does not engage with the engaging recess 63 of the driven rotating body 64 and the driving gear 61 meshes with the driven gear 65 (see FIG. 6).
(See (c)). Here, a support pin 66 protrudes from the center axis of the driven rotary body 64, and the support pin 66 is slidably fitted into a shaft hole 67 formed from the drive rotary body 62 to the inside of the drive rotary shaft 59. Thus, the rotation center of the driving rotating body 62 is defined.

Here, the upper part of the driven rotary shaft 41 to which the driven rotary body 64 and the driven gear 65 are fixed is formed by cutting the upper part of the cylindrical part 21 at the upper part of the inner leg cylinder 15. The mounting members 68 are fixed so as to be rotatable at fixed positions. Further, the driven rotary shaft 4
The lower portion of 1 is rotatably mounted on the support plate 24 fixed to the outer leg tube 13 as described above, and the gear 42 is fixed to the lower end thereof. Here, when adjusting the height of the top plate 2, the inner leg tube 1 is
5 is vertically displaced, so that the driven rotary shaft 41 has an extendable structure. For example, the lower shaft to which the gear 42 of the driven rotary shaft 41 is fixed and the upper shaft to which the driven gear 65 is fixed are nestedly fitted, and rotate integrally with each other for rotation, but have a vertical relative displacement. A structure that allows for is adopted. This situation can be clearly understood by comparing the state in which the top 2 in FIG. 2 is lowered most in the top adjustment mode with the state in which the top 2 in FIG. 7 is raised most.

In this embodiment, the torque transmission wires 44 and 48 are used as a part of the rotary drive mechanism 8 for transmitting the rotary drive force from the handle 7 to the clutch mechanism 10, but other known torque transmissions are used. Means can be adopted.

The top plate lifting mechanism 3 and the caster driving mechanism 6 use the screw shaft 23 and the screw shaft 23 in the top plate lifting mechanism 3 so that the same change amount is created with respect to the rotation speed of the handle 7. In the caster driving mechanism 6, the pitch of the holes 25, the pitch of the screw shaft 31 and the screw hole 33, the number of teeth of the driving gear 61 and the driven gear 65, the number of teeth of the gears 40 and 42, and the support shaft 36 of the tilting rod 34 Is set.

Finally, an example of a method of using the present invention will be described with reference to FIG. The present invention operates the switching means 9,
By using the common handle 7, in the top adjustment mode, the top 2
The height adjustment of the top plate 2 and the up and down movement of the casters 5 can be performed simultaneously and synchronously in the tuning mode.
As described above, only the casters 5 can be moved up and down in the caster appearing mode. Then, as shown in FIG. 8 (a), first, in the top plate adjustment mode, in a non-movable use state in which the grounding members 4, 4 are placed on the floor F, the handle 7 is rotated to lift the floor from the floor F. The height to the upper surface of the plate 2 is adjusted to H. Thereafter, the mode is switched to the tuning mode, and when the handle 7 is rotated in the direction in which the top 2 descends, the height from the lower end of the grounding member 4 to the upper surface of the top 2 becomes H, as shown in FIG. with lowered to _1, the movable state protrudes by lower caster 5 height H ₂ from the grounding member 4. However, since the relationship is set so that H ₁ + H ₂ = H, the height H from the floor surface F to the upper surface of the top plate 2 is always maintained. Even in the reverse operation, the height from the floor surface F to the upper surface of the top board 2 is maintained in the tuning mode. That is, in the tuning mode or the caster appearing / retracting mode, the caster 5 is made to protrude below the grounding member 4 so as to be movable, and then the height of the top 2 is adjusted in the top adjustment mode, and then the caster 5 is moved in the tuning mode. Even if it is pulled into the grounding member 4 and cannot be moved, the height of the top plate 2 after adjustment is kept constant.

Although not shown, when a table according to the present invention is used, when a table of another table is superimposed on the upper surface of the table 2 or when the table according to the present invention is moved, a caster is used. Even if the projection 5 projects downward from the grounding member 4, the height of the top plate 2 from the floor surface does not change, so that the top plate 2 can be easily moved.

[0030]

According to the furniture of the present invention, the top plate can be moved up and down with respect to the legs by the top plate elevating mechanism and the lower end of the grounding member fixed to the legs is used as a reference. In a structure in which the casters can be moved up and down by the caster drive mechanism, by rotating one handle, height adjustment of the top plate and adjustment of the relative vertical position of the casters with respect to the ground member fixed to the lower end of the legs,
That is, since it is possible to perform the change between the immovable state and the movable state, the operability is extremely excellent, and the up and down drive of the caster at the time of the change between the movable state and the immovable state is achieved. Also, since the height of the top plate from the floor surface does not change, a desired set height can be obtained in an immovable use state regardless of the height adjustment of the top plate at any time.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a table according to the present invention.

FIG. 2 is a longitudinal sectional side view showing a main part of the present invention, in a state where a top plate is most lowered.

3A and 3B show a vertical sliding structure of an outer leg tube and an inner leg tube of a leg portion, wherein FIG. 3A is a cross-sectional view, and FIG. 3B is a side view of a slide bearing.

FIG. 4 is an enlarged vertical sectional side view showing a main part of a top plate elevating mechanism and a caster driving mechanism.

FIG. 5 is a cross-sectional view showing a part of a rotary drive mechanism and a main part of a lever operation mechanism.

6A and 6B show a clutch mechanism, wherein FIG. 6A is a partial cross-sectional explanatory view in a top plate adjustment mode, FIG. 6B is an abbreviated explanatory view in a tuning mode, and FIG.

FIG. 7 is a partial vertical cross-sectional side view in a state where a top plate is raised most.

8A and 8B show a usage example of the present invention, in which FIG. 8A is a side view of a non-movable use state, and FIG. 8B is a side view of a movable state.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Leg part 1A Lower leg 1B Upper leg 2 Top plate 3 Top plate elevating mechanism 4 Grounding member 5 Caster 6 Caster driving mechanism 7 Handle 8 Rotation driving mechanism 9 Switching means 10 Clutch mechanism 11 Beam member 12 Support member 13 Outer leg tube 14 Fixed Member 15 Inner leg tube 16 Slide bearing 17 Cap 18 Lever operating mechanism 19 First screw member 20 Second screw member 21 Tube portion 22 Shaft 23 Screw shaft (first screw member) 24 Support plate (second screw member) 25 Screw Hole 26 Shoulder 27 Thrust bearing 28 Holding plate 29 Through hole 30 Rotating cylinder 31 Screw shaft (first screw member) 32 Lifting cylinder (second screw member) 33 Screw hole 34 Tilt rod 35 Pin 36 Support shaft 37 Shaft 38 Flange part 39 Thrust bearing 40 Gear 41 Followed rotating shaft 42 Gear 43 Tube part 44 Torque transmission wire 45 Gear 46 Lift assembly 47 Gear 48 Torque transmission wire 49 Shaft 50 Shaft 51 Spline shaft 52 Bearing 53 Support shaft 54 Operating rod 55 Arm rod 56 Pin 57 Operating lever 58 Opening 59 Driving rotary shaft 60 Engaging claw 61 Driving gear 62 Driving rotary body 63 Engagement concave portion 64 Followed rotating body 65 Followed gear 66 Support pin 67 Shaft hole 68 Mounting member

Claims (4)

[Claims] 1. A movable elevating ceiling in which a top plate can be moved up and down with respect to a leg by a top plate elevating mechanism and a caster can be moved up and down by a caster driving mechanism with reference to a lower end of a grounding member fixed to the leg. A fixture with a plate, wherein the top plate elevating mechanism and the caster drive mechanism are both mechanisms that operate by rotating a handle, and a mechanism that creates the same change amount with respect to the number of rotations of the handle. A top adjustment mode for adjusting the height of the top plate by transmitting the rotation driving force of the handle to at least only the top lift mechanism by the switching means provided in the rotation drive mechanism including the top lift mechanism and the caster drive mechanism At the same time, the height change of the top plate with respect to the legs and the vertical change amount of the casters match, and it is possible to realize the tuning mode in which the height of the top plate from the floor is always kept constant. Furniture with movable top and bottom, characterized by: 2. In addition to the top plate adjusting mode and the tuning mode, a caster retracting mode in which the switching means transmits the rotational driving force of the handle only to the caster driving mechanism to move the caster up and down with respect to the grounding member is realized. 2. A fixture with a movable lifting plate according to claim 1. 3. The top plate raising / lowering mechanism and the caster driving mechanism each include a first screw member having a screw shaft, and a second screw member having a screw hole into which the screw shaft is screwed. 3. The movable lifting and lowering plate according to claim 1, wherein one of the member and the second screw member is attached to the fixed portion and the other is attached to the movable portion, and the first and second screw members are driven by advancing and retreating. Furnishings. 4. The driving device according to claim 1, wherein said switching means includes a driving rotary shaft for transmitting a rotational driving force from said handle, an engaging claw protruding axially at an end at a distal end, and a driving gear fixed at a base end side. A rotating body is provided, and the driving rotating body is made movable in the axial direction by an operation lever, and the engaging claw is engaged with the end portion for rotating the screw shaft of the top plate elevating mechanism from the axial direction and rotated. A driven rotating body provided with an engaging concave portion to be connected is arranged coaxially with the driving rotating body so as to be rotatable in a fixed position in an opposed state, and a driven rotating shaft for rotating a screw shaft of the caster driving mechanism. A driven gear fixed to an end portion is disposed so as to be rotatable in a fixed position in a side-by-side state in parallel with the driving rotating body, and the driving rotation is performed by an axial displacement of the driving rotating body by the operating lever. Engagement claw of body engages with engagement recess of driven rotor The top plate adjustment mode in which the driving gear does not mesh with the driven gear, and the tuning mode in which the engaging claw of the driving rotator engages with the engaging recess of the driven rotator and the driving gear meshes with the driven gear. 4. A clutch mechanism in which an engaging claw of a driving rotator does not engage with an engaging recess of a driven rotator, and a switching mechanism can be switched to the caster retracting mode in which a driving gear meshes with the driven gear. Furniture with a movable lifting plate as described.