JPS631880Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a guide device for lifting legs of drafting tables, chairs, etc.

In the conventional guide device for the lifting legs of a drafting table, rollers are mounted directly on the four inner walls of the outer column, and the surfaces of these rollers are in contact with the four outer wall surfaces of the inner column that is loosely fitted into the outer column. . In this case, a large number of holes for mounting the rollers have to be drilled in the external column, resulting in a disadvantage that the appearance of the external column becomes unsightly. Therefore, a structure was developed in which rollers were attached to the frame body and this frame body was fixed to the inner wall surface of the external column.
As shown in No. 56-1114, it has been developed by the applicant of the present invention. When this configuration is adopted, the frame cannot be firmly fixed to the external column unless the frame is tightly fitted to the inner circumferential surface of the external column. Therefore, high precision is required for the internal dimensions of the external column relative to the external dimensions of the frame. Although this problem was solved by providing an internal dimension adjustment mechanism in the external column in the above-mentioned Japanese Patent Application Laid-open No. 56-1114, the mechanism was complicated and the adjustment operation was not easy. The present invention aims to eliminate the above defects.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of the present invention will be described in detail below with reference to embodiments of a drafting table shown in the accompanying drawings.

Reference numeral 2 denotes a base of the elevating drafting table, which is placed on the floor via adjusters attached to the four corners of the bottom. An external column 4 made of a hollow member with a square cross section is erected on the top surface of the base 2. Nuts 6 fixed to each of the four corners of the lower end of the external column 4 are used to connect the upper plate of the base 2 with transparent parts. A bolt 10 inserted into the provided hole is screwed. A hole is provided in the center of the upper plate of the base 2, into which the outer peripheral surface of the cylinder 12 of the gas spring is slidably fitted. (not shown) is placed on the top surface. 1
Reference numerals 4 and 16 designate a pair of frame plates that face each other horizontally, and four pillars 18 are arranged perpendicularly to the frame plates 14 and 16 between opposing faces at the four corners.
A screw hole is opened in both end faces of each support, and bolts 20 inserted into transparent holes in the four corners of the frame plates 14 and 16 are screwed into the screw hole. Frame plates 14 and 16 are fixed to both ends of the support column 18. The dimensions of the rectangular contour around the outside of the frame plates 14 and 16 are set to be slightly smaller than the rectangular contour around the inside of the external column 4. The outlines of the frame plates 14, 16 and the outline of the external column 4 are similar in this embodiment. The frame plates 14, 16 and the four pillars 18 collectively constitute a box-shaped frame 20'.
Holes 22 are perpendicularly perpendicular to the upper and lower parts of each of the four pillars 18. The axial direction of each of the holes 22 is directed toward the four corners of the external column 4. A protrusion 26 made of a bolt is loosely fitted into the hole 22. 19 is a pipe that rotatably fits into the support column 18, and these holes 2
A screw hole 23 and a hole 25 are formed at locations corresponding to 2. The protrusion 26 is inserted into the hole 25 into a rotating material and is screwed into the screw hole 23.
Note that the hole 25 may be a screw hole. 27 is Natsu. 28 and 30 are blocks arranged on the upper surface of one side of the frame plate 14 (see Fig. 2);
A pair of screw holes 32 (the other not shown) and a pair of screw holes 34 (the other not shown) are formed in each of the blocks. At predetermined positions on one side of the frame plate 14, transparent holes 36 and 38 are provided corresponding to the screw holes 32 and 34.
Bolts 40, 42 are loosely fitted into the bolts 40, 42.
42 is screwed into the screw holes 32 and 34. A guide roller 41 consisting of a ball pair is rotatably mounted on a shaft 44 between the pair of blocks 28 and 30. The blank holes 36, 38, screw holes 32, 34, and bolts 40, 42 constitute a roller position adjustment mechanism. The blocks 28, 3 are also provided on the upper surface of the side opposite to one side of the frame plate 14.
A pair of blocks having the same structure as the guide roller 41 are attached via the same mechanism as the roller position adjustment mechanism, and a guide roller having the same structure as the guide roller 41 is rotatably supported on the pair of blocks. A block 46 is attached to the upper surface of the side adjacent to the one side of the frame plate 14 via a roller position adjustment mechanism having the same structure as the roller position adjustment mechanism, and on both sides of the block 46, Guide rollers 48 and 50 are rotatably supported. Block 4 of frame plate 14
A block with the same shape as the block 46 is also attached to the upper surface of the side opposite to the side on which the block 46 is attached via a roller position adjustment mechanism, and a pair of guide rollers are rotatably attached to both sides of the block. It is pivoted. Guide rollers are attached to the lower surface of the frame plate 16 with the same structure as the upper surface of the frame plate 16 described above. A mounting piece 52 is fixed to the frame plate 14, and a screw hole 54 is provided therethrough. A hole 56 for inserting a screw is provided in the side wall of the external column 4 in correspondence with the screw hole 54 . 58
is an internal column made of hollow aluminum with a square cross section, and a fitting recess is formed in the center of the lower surface of the cap attached to the upper end of the column, into which the upper end of the gas spring rod is removably fitted. It is configured so that it can be matched. Grooves are formed in the longitudinal direction of the four sides of the internal column 58,
A strip-shaped steel plate 60 is press-fitted into the groove. The surface of the steel plate 60 forms a roller guide surface.
A horizontal pipe 62 is removably fixed to the upper end of the internal column 58, and a drawing board support frame (not shown) is attached to the horizontal pipe 62.

Next, the operation of this embodiment will be explained. Before inserting the internal column 58 into the external column 4, the frame 20 is fitted into the internal column 58, and in this state, the frame 20 and each block 28, 30, 46 are pressed in the side direction of the internal column 58 to guide it. Koro 41,4
The surfaces of 8 and 50 are covered with respective corresponding steel plates 60.
Then, the bolts 40, 42, etc. of the roller position adjusting device are rotated in the tightening direction to fix each block to the frame plates 14, 16. Next, frame 20 is removed from internal column 58. Next, the frame body 20 is placed into the external column 4, with the frame plate 16 facing downward and the longitudinal direction of the frame plates 14, 16 in the horizontal longitudinal direction of the hollow part of the external column 4. The mounting piece 52 is loosely fitted in accordance with the mounting piece 52.
The frame body 20 is positioned on the upper part of the external column 4 with the screw hole 54 facing the hole 56, and the mounting piece 52 is crimped and fixed to the external column 4 with a bolt 66. In this state, each protrusion 26 of the column 18 is rotated in a plane perpendicular to the column 18 to align each tip with each corner of the inner wall surface of the external column 4. Next, the protrusion 26
are rotated relative to the screw holes 23 to cause the protrusions 26 to protrude outward, and the tips of each protrusions 26 are pressed against each corner, that is, the four corners, of the inner wall surface of the external column 4 as shown in FIG. Thereby, the frame body 20 is tightly fitted inside the external column 4. Next, external column 4
A gas spring is inserted into approximately the center of the cylinder 12 , and the lower end of the cylinder 12 is fitted into a hole formed in the base 2 . Next, the internal column 58 is inserted into the hollow portion of the frame 20', and the upper end of the gas spring rod is fitted into the fitting recess of the cap (not shown) at the upper end of the internal column 58. Thereby, the total downward load of the inner column 58 is balanced with the elastic force of the gas spring, and the inner column 58 can be manually raised and lowered along the outer column 4 with a small force. The external column has a built-in known brake device (not shown) for the internal column 58, and when the brake lever pedal 68 on the base 2 is stepped on, the brake applied to the internal column 58 is released, and the user releases the brake from the pedal 68. When the brake is applied, the inner column 58 is fixed to the outer column 4.

In this embodiment, since the mounting piece 52 is closely fixed to the column 4, only the protrusion of the support on the side opposite to the mounting side of the mounting piece 52 may be brought into pressure contact with the corner of the column 4. . Alternatively, as shown in FIG. 8, both ends of the support 18 may be rotatably connected to the frame plates 16, 18, and the protrusion 26 may be screwed into a screw hole of the support 18. In the above embodiment, the frame body is tightly fitted and fixed to the outer column, but the frame body may be tightly fitted and fixed to the outer peripheral surface of the inner column as shown in FIG. In FIG. 7, reference numeral 90 denotes an external column made of aluminum, and grooves are formed along the longitudinal direction on each inner wall surface of the column, and steel plates 92 are press-fitted into the grooves. Reference numeral 94 denotes an internal column made of aluminum, and a pressure receiving surface 96 is formed at each corner of the column 94 perpendicular to a diagonal line of the cross section of the column 94. Reference numeral 98 denotes a frame body, and blocks 102, 104, and 106, 108 are fixed to the frame plate 100 on the upper part of this body via a roller position adjustment mechanism (not shown), and each block has guide rollers 110, 112, 114,1
16, 118, and 120 project outward from the outer peripheral surface of the frame plate 100 and are rotatably supported, and the guide rollers are in contact with the roller guide surfaces of the corresponding external columns 90, respectively. Guide rollers are also attached to the lower frame plate of the frame body 98 in the same way as the frame plate 100. The four pillars 122 of the frame body 98 are rotatably supported around their longitudinal central axes, and each of the pillars has a protrusion 124 consisting of two bolts on the top and bottom, which is attached to each of the pressure receiving surfaces 96. The distal end surfaces of the protrusions 124 that are screwed together in the vertical direction are pressed against the pressure receiving surfaces 96 at each corner of the internal column 94 in a substantially perpendicular manner. The internal column 94 is urged upward by the elasticity of a gas spring (not shown). The other structures are the same as those of the embodiment shown in FIG. 1, so their explanation will be omitted. In both of the embodiments shown in FIGS. 1 and 7 above, the external column is fixed;
Although the inner column is movable up and down relative to the outer column, the inner column may be fixed to a base and the outer column may be movable up and down relative to the inner column. Furthermore, even if only one of a pair of diagonally opposed protrusions is movable and the other is fixed, the frame can be tightly fitted and fixed to the column. In addition, in FIG. 1, if a seat is attached to the upper end of the internal column, it can be used as a chair. Since the present invention is constructed as described above, when tightly fitting and fixing the frame body to which the guide rollers are attached to the column, there is no need for high precision in the dimensions of the column, and moreover, the protrusions are aligned in the longitudinal direction of the column. Since it is rotatably supported in a plane substantially perpendicular to the frame, the protrusion can be accurately abutted against the corner of the column, and the frame can be firmly fixed to the column.

[Brief explanation of the drawing]

The figures show a preferred embodiment of the present invention, in which Fig. 1 is a perspective view, Fig. 2 is a sectional view of the roller position adjustment mechanism, Fig. 3 is a partial sectional view of the lower end of the external column, and Fig. 4 is an external view. A cross-sectional view of the lower part of the column, Figure 5 is a partial cross-sectional view,
Figure 6 is a sectional view of the roller, Figure 7 is a partial sectional view, and Figure 8 is a sectional view of the roller.
The figure is a side view showing another embodiment, and FIG. 9 is a sectional view showing another embodiment. 2... Base, 4... External column, 6... Nut, 10... Bolt, 12... Cylinder, 1
4, 16... Frame plate, 18... Support column, 20'... Frame body, 22, 24... Screw hole, 26... Projection, 2
8, 30...Block, 32, 34...Screw hole,
36, 38...Bakaana, 40...Guide Koro, 4
4...Shaft, 46...Block, 48, 56...Guide roller, 52...Mounting plate, 54...Screw hole, 5
6... Hole, 58... Internal column, 60... Steel plate,
70,72...Koro, 74,76...Block,
78... Frame plate, 90... External column, 92... Steel plate, 94... Internal column, 96... Pressure receiving surface, 98
... Frame body, 100 ... Frame board, 122 ... Support column, 1
24... Protrusion.

Claims (1)

[Scope of utility model registration request] An external column 4, an internal column 58 loosely fitted into the space inside the external column 4, a frame 20' loosely fitted outside the internal column 58, and one of the columns 4, 58. A guide roller 4 attached to the frame 20' so as to come into contact with the column 58
1, 48, 50, and the guide rollers 41, 48, 5
0 in one of the columns 4 and 58, column 5
A roller position adjustment mechanism for closely contacting the roller guide surface of No. 8, and each of the upper and lower portions of the frame 20',
It is provided so as to protrude movably in the axial direction toward the corner of the other one of the columns 4, 58, and is rotatably supported within a plane substantially perpendicular to the longitudinal direction of the columns 4, 58. Protrusion 2
6, the protruding body 26 is pressed against the corner of the other column 4, and the frame body 20' is tightly fitted and held in the other column 4. guidance device.