JP2004135819A - Height adjustor for table - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a height adjustor for tables which can reduce the adjusting time by minimizing the frequency of rotating the leg posts for the adjustment of the length thereof of the tables. <P>SOLUTION: The height adjustor for tables has inner leg posts 4 which are fastened on the undersurface of the table and each have an internal thread member 6, with an internal thread 6a at the center thereof, at the lower end part thereof, outer leg posts 5 which are fitted onto the respective inner leg posts 4 and each have an upward externally threaded rod 10 screwed down in the internal thread member 6 at the lower end part thereof and casters 2 which are mounted at the lower parts of the respective outer leg posts 5 while being turnable about the axis the same with that of the externally threaded rod 10. Both the external thread rod 10 and the internal thread 6a of the internal thread member 6 are made rough in pitch. The lower end part of the externally threaded rod 10 is mounted on a bearing member 7 fastened at each of the lower ends of the outer leg posts 5 while a fine-pitch caster shaft 2a at the upper part of each caster 2 is screwed down in a fine-pitch lower internal thread part 8 provided at the lower part of the bearing member 7. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to a table height adjusting device.
[0002]
[Prior art]
2. Description of the Related Art A table height adjusting device in which the height of a top plate can be freely set by adjusting the lengths of four pillars of a table is already known (for example, see Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 10-2111046 (pages 1-2, FIGS. 1-2).
[0004]
[Problems to be solved by the invention]
In the conventional device described above, a male screw rod rising from a lower portion of the outer pillar is screwed into a female screw cylinder provided at a lower end portion of the inner pillar, and the outer pillar is rotated. Although the pillars are moved in and out, since the pitch of the male screw and the female screw is a normal fine pitch for the caster shaft, it takes time and effort to ascend and descend. That is, the caster shaft needs to have a fine pitch in order to be strongly tightened. However, if the caster shaft having the fine pitch is used as it is, the pitch is too fine and the table must be turned many times to move up and down. Since such an elevating operation is performed on all four pillars, it takes time for adjustment.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to provide a table height adjusting device which requires only a small number of rotations of the pedestal to adjust the length of the pedestal of the table, and requires only a short adjustment time.
[0006]
[Means for Solving the Problems]
According to the present invention, the above-mentioned problem is solved as follows.
(1) An inner pedestal fixed to the lower surface of the table and having a female screw member having a female screw at the center at its lower end, and an upwardly directed male screw fitted to the inner pedestal and screwed to the lower end at the female screw member A height adjusting device for a table, comprising: an outer pedestal having a rod; and a caster mounted on a lower portion of the outer pedestal and rotatable around an axis coaxial with the male screw rod, wherein the male screw rod and the female screw member are provided. The female threads of both are coarse in pitch, the lower end of the male threaded rod is attached to a bearing member fixed to the lower end of the outer pillar, and the lower female threaded section of fine pitch provided in the lower part of the bearing member. Then, a caster shaft having a fine pitch on the caster is screwed.
[0007]
(2) In the above item (1), an upper female screw portion having a coarse pitch is formed at an upper portion of the bearing member, a lower end of a male screw rod is screwed to the upper female screw portion, and the male screw rod is provided above the bearing member. The male screw rod is fixedly fastened by tightening a nut screwed toward the bearing member.
[0008]
(3) In the above item (1) or (2), a scale indicating the height of the table is provided at a position on the upper part of the inner pedestal where the upper end of the outer pedestal moves up and down.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a perspective view of a table provided with an embodiment of the present invention, FIG. 2 is an enlarged view showing one leg vertically, and FIG. 3 is an enlarged front view showing a height scale at the upper part of the leg. It is.
[0010]
As shown in FIG. 1, legs (3) with casters (2) are attached to the four corners of the lower surface of the table top (1).
[0011]
As is evident in FIG. 2, the leg (3) covers the inner leg (4) with the upper end fixed to the lower surface of the top plate (1), and the outer leg along the outside of the inner leg (4). It comprises an outer pillar (5) with a caster (2) attached to the lower end.
[0012]
The inner pedestal (4) consists of a hollow steel tube, the lower end ending at an intermediate position to the floor. A female screw member (6) having a female screw (6a) with a coarse pitch cut at the center is fixed to the inner surface of the lower end portion.
[0013]
The upper end of the outer pillar (5) ends at a position slightly below the lower surface of the top plate (1), and a bearing member (7) is fixed to the inner surface of the lower end.
[0014]
The center shaft hole (7a) of the bearing member (7) is provided with a fine-pitch female screw at the lower portion thereof. The caster shaft (2a) of the caster (2) is screwed into the lower female screw portion (8). It is fixed.
[0015]
The upper part of the center shaft hole (7a) of the bearing member (7) is provided with a coarse pitch male screw, and the upper female screw part (9) is provided with a lower end part of an upward male screw rod (10) also having a rough pitch. Is screwed in and firmly tightened and fixed by a flat washer (11), a spring washer (12) and a nut (13). In some cases, the externally threaded rod (10) may be fixed to the bearing member (7) by, for example, welding. This eliminates the need to cut a screw above the central shaft hole (7a) of the bearing member (7), and does not require a fixing means such as a nut or a washer.
[0016]
The male screw rod (10) is screwed into the female screw (6a) at the center of the female screw member (6) at the lower end of the inner pillar (4), and extends upward to an intermediate position of the leg (3).
[0017]
As shown in FIG. 3, a scale (14) is provided on the upper outer peripheral surface of the inner pillar (4). The reading where the upper end of the outer pillar (5) hides the scale (14) indicates the height of the tabletop from the floor, that is, the height of the table.
[0018]
【The invention's effect】
According to the first aspect of the present invention, the number of times of rotating the outer pedestal for adjusting the height of the leg is reduced, and the labor and time for the adjustment can be greatly reduced.
[0019]
According to the second aspect of the present invention, the male screw rod having a coarse pitch can be firmly fixed to the bearing member.
[0020]
According to the third aspect of the present invention, it is possible to accurately and reliably set the lengths of the legs, and to easily and surely equalize the lengths of the four legs.
[Brief description of the drawings]
FIG. 1 is a perspective view of an example of a table including an embodiment of the present invention.
FIG. 2 is a partially longitudinal enlarged view of one leg.
FIG. 3 is a partially enlarged front view of the upper part of one leg.
[Explanation of symbols]
(1) Top plate (2) Caster (3) Leg (4) Inner pillar (5) Outer pillar (6) Female screw member (6a) Female screw (7) Bearing member (7a) Center shaft hole (8) Lower female screw Part (9) Upper female screw part (10) Male screw rod (11) Flat washer (12) Spring washer (13) Nut (14) Scale

Claims (3)

An inner pedestal fixed to the lower surface of the table and having a female screw member provided with a female screw at the center at the lower end, and an upwardly-facing male screw rod externally fitted to the inner pedestal and screwed to the female screw member at the lower end. A height adjusting device for a table, comprising: an outer pedestal; and a caster mounted on a lower portion of the outer pedestal and capable of rotating around an axis coaxial with the male screw rod.
The female thread of the male threaded rod and the female thread of the female threaded member are both coarse-pitched, and the lower end of the male threaded rod is attached to a bearing member fixed to the lower end of the outer pillar, and provided at the lower part of the bearing member. A caster shaft having a fine pitch on the caster is screwed to a lower female screw portion having a fine pitch. An upper female screw portion with a coarse pitch is formed on the upper part of the bearing member, the lower end of the male screw rod is screwed to the upper female screw portion, and a nut screwed with the male screw rod provided above the bearing member faces the bearing member. The table height adjusting device according to claim 1, wherein the male screw rod is fixed by tightening. 3. The table height adjusting device according to claim 1, wherein a scale indicating the height of the table is provided at a position where the upper end of the outer pedestal moves up and down in the upper part of the inner pedestal.

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