JP2721819B2 - Height adjustment mechanism for tables, etc. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a height adjusting mechanism such as a table which can maintain an adjustment state firmly and can easily perform an adjustment operation.

[0002]

2. Description of the Related Art A conference table or chair is conventionally provided with a height adjusting mechanism so that a user can adjust a desired table height or seating height. For example, Japanese Utility Model Laid-Open Publication No. 61-115705 discloses that an embedded nut is mounted in a horizontal bent portion of a table pillar, a mounting bolt for a caster is screwed into the nut, an adjustment handle is fixed to the upper end thereof, and A height adjusting mechanism is shown in which a pair of screwed locking members are pressed against upper and lower surfaces of a horizontal bent portion to maintain an adjusted state.

However, in this conventional mechanism, the adjusting member is easily loosened due to the contact of the foot with the locking member, the vibration during the movement of the table, etc., and the locking member is loosened.
In addition, there is a problem in that the operation of loosening or tightening the lock member is required at the time of adjustment, which is troublesome.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a height adjusting mechanism for a table or the like which can solve such a problem and can maintain the adjustment state firmly and can easily perform the adjustment work. With the goal.

[0005]

For this reason, a height adjusting mechanism for a table or the like according to the present invention includes a mounting bolt rotatably mounted on a caster, a leg support frame for mounting the bolt, and a coaxial mounting bolt. A height adjustment mechanism, such as a table, in which a position of the leg support frame on the mounting bolt can be adjusted through a rotating operation of the adjusting knob, the guide groove being provided on the mounting bolt. And a lock piece having a locking piece engageable with the groove, and a lock piece connectable to the lock piece. The lock piece is fixed to the leg support frame, and mounting bolts are provided inside the lock piece. On the other hand, an adjustment knob having a shaft portion that can be inserted into the lock piece is provided, and the shaft portion is provided so as to be screwable with the mounting bolt,
The shaft is connected to the lock piece so that the adjustment state can be maintained firmly and the adjustment operation can be performed easily.

[0006]

According to a first aspect of the present invention, there is provided a lock bolt having a guide groove formed in a mounting bolt, a lock piece having a locking piece engageable with the groove, and a lock piece connectable to the lock piece.
These lock pieces are fixed to the leg support frame, and mounting bolts are inserted through them to prevent co-rotation between the casters and the mounting bolts. Adjustment by picking can be performed reliably and smoothly. In addition, an adjustment knob having a shaft portion that can be inserted into the lock piece is provided, the shaft portion is provided so as to be screwable with the mounting bolt, the shaft portion is connected to the lock piece, and the movement of the adjustment knob is restricted to adjust. A change in the adjustment state due to an external force or the like acting on the pick is prevented. The adjustment can be performed immediately by rotating the adjustment knob, and this kind of adjustment can be easily performed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of an embodiment of the present invention applied to a conference table. In FIGS. 1 to 13, reference numeral 1 denotes a conference table, which is a top plate 2 and a support plate attached to the lower surface thereof on four sides. Frames 3 and 4, pillars 5 and 5 for supporting the top plate 2, a connection frame 6 erected between these upper ends, and leg support frames 7 and 7 attached to the lower ends of the pillars 5 and 5. The frame 7,
7 and casters 8, 8 attached to both ends.

The casters 8 are provided with mounting bolts 9 projecting therefrom, which are rotatably connected to each other, and a guide groove 10 is formed in the peripheral surface of the screw shaft along the axial direction. On the other hand, the leg support frame 7 is formed of a tube material having a rectangular cross section, and through holes 11 and 12 having the same diameter are formed at the upper and lower surfaces of both ends at the same coaxial position, and a cutout groove 13 is formed in the lower through hole 12. The lower lock piece 14 made of synthetic resin is inserted into these holes 11 and 12.

The lower lock piece 14 is formed in a hollow cylindrical shape with a bottom as shown in FIG. 5, and a lower end edge thereof is provided with a flange 15 which can be engaged with an outer opening edge of the through hole 12. A protrusion 16 is provided on the projection 15 so as to be engageable with the notch groove 13. A partition wall 17 is formed at the lower end of the lower lock piece 14. The partition wall 17 is hung on the head 9 a of the mounting bolt 9, and has a through hole 18 in the center of which the mounting bolt 9 can be inserted. An annular wall 19 protrudes inward from the opening edge. In the figure, reference numeral 20 denotes a locking piece protruding from the inner surface of the annular wall 19, which can be engaged with the guide groove 10, and 21 and 21.
Is an engagement opening formed opposite to the peripheral surface of the lower lock piece 14 to enable the engagement claws 23 of the upper lock piece 22 made of synthetic resin to be engaged.

The upper lock piece 22 is formed in a hollow cylindrical shape as shown in FIG.
The engaging claws 23 are projected at symmetrical positions on the peripheral surface of the lower end portion. Engaging claws 23, 2
3 is formed in a tapered shape whose diameter is reduced toward the lower side, and a cut groove 24 is formed in a base peripheral edge thereof.
3 can be elastically displaced inward. Engaging claw 23,
An annular locking piece 25 protrudes from an upper peripheral surface of the piece 23 so that the piece 25 can be engaged with a peripheral edge of an outer opening of the through hole 11. Is inserted.

The adjusting knob 26 is formed in a cylindrical shape as shown in FIG. 5, and a tubular shaft 27 is provided on the inner side of the adjusting knob 26 so as to protrude outside the adjusting knob 26. Is formed, and locking claws 29, 29 are projected from symmetrical positions on the peripheral surface of the lower end of the shaft 27.

The locking claws 29 are formed in a tapered shape whose diameter is reduced toward the lower side.
And the lower end thereof can be engaged with the end face of the annular wall 19. In the figure, 3
Reference numerals 0 and 30 denote notches formed to face the inner surface of the screw portion 28 so as to promote elastic displacement of the locking claws 29 and 29 inward.

In the height adjusting mechanism for a table or the like thus constructed, through holes 11 and 12 are formed in the upper and lower surfaces of the end portion of the leg support frame 7 when manufacturing the same, and a cutout groove is formed in the lower through hole 12. 13 is formed. The mounting bolt 9 having the guide groove 10 is mounted on the caster 8, and the upper and lower lock pieces 2 are mounted.
The resin 2 and 14 and the adjustment knob 26 are molded with resin.

Next, when assembling these, the lower lock piece 14 is inserted into the through hole 12, the projection 16 is inserted into the cutout groove 13, and the upper lock piece 22 is inserted while maintaining the state. Inserted into the hole 11 and the engaging claw 2
3 and 23 are pushed into the engagement ports 21 and 21, and these are engaged. In this way, the upper and lower lock pieces 2
2 and 14 are connected to the leg support frame 7, the locking pieces 25 are engaged with the upper surface of the frame 7, the upper half of the upper lock piece 22 projects from the upper surface of the frame 7, and the flange 15 Engages with the outer edge of the through hole 12, and the lower lock piece 14 is mounted inside the leg support frame 7, leaving the partition wall 17 exposed.

Under these circumstances, the mounting bolt 9 integrated with the caster 8 is inserted into the through hole 18 so that the guide groove 1 is formed.
0 is inserted into the locking piece 20, the shaft 27 of the adjustment knob 26 is inserted into the upper lock piece 22 while maintaining the above state, and the screw 28 is screwed into the mounting bolt 9. , 29 are engaged with the lower edge of the upper lock piece 22.

In this manner, the adjustment knob 26 is connected to the mounting bolt 9, which is mounted on the upper surface of the leg support frame 7, the inner surface of which is engaged with the upper end of the upper lock piece 22 and the shaft 27. Lock piece 2 with the tip of the upper side
2 and is hooked on the piece 22.
FIGS. 3 and 4 show the state of the mounting.

To adjust the height of the conference table 1 in such a situation, the adjustment knob 26 may be rotated. That is, when the adjustment knob 26 is rotated, the shaft 27
Move along the mounting bolt 9 via the screw portion 28, and when the lock claw 29, 29 moves upward, the upper lock piece 22
, The piece 22 is pushed up, and the lower lock piece 14 is moved together with the piece 22, and the leg support frame 7 integrated with the lock pieces 22, 14 is pulled up, and the top plate 2 Height is adjusted higher.

On the other hand, when the shaft 27 is moved down, the inner surface of the adjustment knob 26 engages with the upper end of the upper lock piece 22 and pushes down the piece 22, and the lower lock piece 14 moves with it. The leg support frame 7 integrated with the lock pieces 22 and 14 is pulled down, and the height of the top plate 2 is adjusted to be low. 3 and 4 show a situation where the table height is adjusted to the lowermost position, and FIGS. 12 and 13 show a situation where the table height is adjusted to the middle position.

As described above, according to the present invention, the conventional complicated operation of loosening the lock nut before the adjustment and tightening the lock nut after the adjustment is not required, so that this kind of adjustment operation can be easily performed. Further, the projection 16 is engaged with the notch groove 13, and the lower lock piece 14 holds the fixed position of the leg support frame 7.
0 is engaged with the guide groove 10 of the mounting bolt 9 and the shaft 27
Adjustment knob 2 to prevent co-rotation of the
The amount of adjustment by 6 is transmitted to the bolt 9 reliably, in other words, the adjustment knob 26 moves reliably and smoothly along the mounting bolt 9 to promote reliable and smooth adjustment.

After the adjustment, the engagement between the engaging piece 20 and the guide groove 10 is maintained, and the co-rotation of the mounting bolt 9 and the caster 8 is prevented. The movement of the bolt 9 and the formation of relative displacement between the adjustment knob 26 and the mounting bolt 9 are prevented, and the initial adjustment state is maintained. Moreover, the locking claws 29, 29 engage with the lower end of the upper lock piece 22 and the annular wall 19 to restrict the movement of the adjustment knob 26 and prevent the relative displacement with the mounting bolt 9 from being formed. For example, there is no fear that the adjustment state may be easily deviated by the foot touching the adjustment knob 26.

In this embodiment, the present invention is applied to the conference table 1. However, the present invention is not limited to this, and can be applied to a height adjusting mechanism of a chair, OA equipment, furniture and the like provided with the casters 8.

[0022]

As described above, the height adjusting mechanism for a table or the like according to the present invention has a guide groove formed in a mounting bolt and a lock piece having a locking piece engageable with the groove, and The lock pieces that can be connected are provided, and these lock pieces are fixed to the leg support frame and the mounting bolts are inserted inside the lock pieces, so that the casters and the mounting bolts are prevented from rotating together, and the casters are adjusted by turning and moving. To prevent changes and maintain the initial adjustment state firmly,
The adjustment by the adjustment knob can be performed reliably and smoothly. In addition, an adjustment knob having a shaft portion that can be inserted into the lock piece is provided, and the shaft portion is provided so as to be screwable with the mounting bolt, and the shaft portion is connected to the lock piece. The change of the adjustment state due to the external force acting on the knob can be prevented, and the lock nut can be adjusted immediately by rotating the adjustment knob without the conventional complicated operation of loosening and tightening the lock nut. This kind of adjustment work can be easily performed.

[Brief description of the drawings]

FIG. 1 is a front view showing one embodiment of a conference table to which the present invention is applied.

FIG. 2 is a right side view of FIG.

FIG. 3 is an enlarged cross-sectional view showing a main part of the present invention, showing a state at the time of adjusting a lowermost position height.

FIG. 4 is an enlarged cross-sectional view showing a main part of the present invention, and shows a state when adjusting the height of the lowermost position as viewed from the side in FIG. 3;

FIG. 5 is an exploded perspective view showing a main part of the present invention.

6 is a cross-sectional view taken along the line AA of FIG. 5, showing a lower lock piece applied to the present invention.

FIG. 7 is a cross-sectional view taken along the line BB of FIG. 5, showing a lower lock piece applied to the present invention.

FIG. 8 is a cross-sectional view taken along the line CC of FIG. 5, showing an upper lock piece applied to the present invention.

FIG. 9 is a cross-sectional view taken along the line DD in FIG. 5, showing an upper lock piece applied to the present invention.

FIG. 10 is a sectional view taken along the line EE in FIG. 5, showing an adjustment knob applied to the present invention.

11 is a sectional view taken along the line FF in FIG. 5, showing an adjustment knob applied to the present invention.

FIG. 12 is an enlarged cross-sectional view showing a main part of the present invention, showing a state at the time of adjusting an intermediate height position.

13 is an enlarged cross-sectional view showing a main part of the present invention, and shows a state when adjusting the intermediate height position as viewed from the side in FIG.

[Explanation of symbols]

 7 Leg support frame 8 Caster 9 Mounting bolt 10 Guide groove 14,22 Lock piece 20 Locking piece 26 Adjustment knob 27 Shaft

Claims (1)

(57) [Claims] 1. A mounting bolt rotatably mounted on a caster, a leg support frame for mounting the bolt, and an adjustment knob rotatably disposed coaxially with the mounting bolt. In a height adjustment mechanism such as a table that allows the position of the leg support frame on the mounting bolt to be adjustable,
A guide groove is formed in the mounting bolt, a lock piece having a locking piece engageable with the groove, a lock piece connectable to the lock piece are provided, and these lock pieces are fixed to the leg support frame; and An adjusting knob having a shaft portion that can be inserted into the lock piece is provided inside the mounting bolt, and the shaft portion is screwably fitted to the mounting bolt, and the shaft portion is connected to the lock piece. Height adjustment mechanism for tables and the like.