JPH0239387Y2 - - Google Patents

Description

[Detailed description of the invention] <<Industrial application>> This invention is used to raise and lower the top of a desk, etc. by rotating a handle provided on the front side of the top of the desk, or on the underside of the top. This invention relates to a height adjustment device.

<<Prior Art>> A height adjusting device for a desk or the like that raises and lowers a top plate by rotating a handle is known, for example, as described in Japanese Utility Model Application No. 59-139128.

[Problems that this invention attempts to solve]

However, in conventional devices, the handle for raising and lowering the top plate does not rotate when the top plate is at its highest or lowest position.

For this reason, if you turn the handle vigorously, the handle will suddenly stop turning when the top plate reaches its highest or lowest height, which may put an excessive load on the handle and cause it to break. Not only did this have the disadvantage of subjecting the neck to a strong impact, which could even result in a sprained wrist, but if the handle broke, there was a major problem in that the top plate could no longer be raised or lowered.

This invention improves the above drawbacks with a simple configuration,
To provide a height adjusting device for a desk, etc., in which a top plate will naturally no longer rise or fall when it reaches the highest or lowest height even if the handle is continued to be rotated.

<<Example>> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 2 shows a perspective view of a desk equipped with the present invention,
1 is a top plate; 11, 11 are left and right lifting legs attached to the bottom surface of the left and right ends of the top plate 1; 12, 12 are left and right lifting legs;
3 and 13 are top plate reinforcing materials fixed to the back surface of the top plate 1 in the front-rear direction; 3 is the back side of the top plate 1;
11. A height adjustment device provided within the left and right fixed legs 12, 12.

The height adjustment device 3 includes a transmission bearing seat 31 provided at the rear of the back surface of the top plate 1, and rotation shaft upper end seats 32, 32 provided inside the upper ends of the left and right lifting legs 11, 11.
A transmission shaft 34 is rotatably held in the shaft and has transmission spiral gears 33, 33 attached to the left and right ends.
and a lifter spiral gear 35, 35 that meshes with the transmission spiral gear 33, 33 at the upper end, the upper end is rotatably held by the upper end seat 32, 32 of the rotation shaft, and the lifting leg 12, The fixing leg 1 is screwed into the rotating shafts 5, 5 vertically installed in the rotating shafts 5, 5, and the threaded parts 51, 51 provided on the rotating shafts 5, 5.
Nut 61 attached to the upper end of 2, 12,
61, and a drive bevel gear 37 that meshes with a transmission bevel gear 36 provided on the transmission shaft 34 within the transmission bearing seat 31 at the end thereof, and the rear end is connected to the transmission bearing seat 31. A drive shaft 38 rotatably held in the drive shaft 38, a handle seat 39 rotatably holding the front end of the drive shaft 38, and a handle seat 39 provided at the front end of the drive shaft 38 within the handle seat 39. The handle 4 has a handle spiral gear 41 that meshes with a rotation spiral gear 40 and is rotatably attached to the handle seat 39.
It is composed of

The upper end seats 32, 32 of the left and right rotation shafts, the spiral gears 33, 33 for transmission, the spiral gears 35, 35 for lifters, the rotation shafts 5, 5, and the threaded parts 6, 6 have the same shape, and can be moved up and down on the left and right sides. Since the legs 11, 11 and the left and right fixed legs 12, 12 are provided facing each other, only one will be explained below.

The rotating shaft upper end receiving seat 32 has a substantially L-shaped cross section and is attached to an upper reinforcing member 111 provided at the upper end of the elevating leg 11. The upper end is rotatably held.

The rotation shaft 5 has a thrust bearing 5 which is in contact with the lower surface of the upper reinforcing member 111 of the lifting leg 11 below the lifter spiral gear 35 provided at the upper end.
3, and a spring pin is passed through the thrust bearing 53 downward by a predetermined distance to define the minimum height of the top plate 11.
An upper small diameter portion 55 is formed below the upper stopper portion 54 by a predetermined distance, the upper small diameter portion 55 has a dimension equal to or less than the root diameter of the threaded portion 51 that defines the vertical dimension, and is larger than the thickness of the nut 61. A lower small diameter part 56 of the same shape as the upper small diameter part 55 is formed at the lower end of the threaded part 51 provided below the upper small diameter part 55, and a spring pin is passed through the lower part of the lower small diameter part 56 to define the maximum height of the top plate. A lower stopper portion 57 is formed.

The threaded part 6 is attached to the upper joint material 121 provided at the upper end of the fixed leg 12, and when the top plate 1 is at its lowest position, the upper stopper part 54 comes into contact with the upper surface, preventing the movement of the elevating leg 11. A nut seat 62 to be stopped, a nut 61 that is movable in the vertical direction by a predetermined dimension within the nut seat 62, and slightly movable in the left and right front and back directions, but is held in an unrotatable manner; It is composed of a spring 63 that always presses against the upper joint material 121 side.

The present invention is constructed as described above, and when the handle 4 is continuously rotated in the direction in which the top plate 1 is lowered, the rotation of the handle 4 is controlled by the spiral gear 4 for the handle.
1. The rotation of the drive shaft 38 is transmitted to the drive shaft 38 via the rotation spiral gear 40, the rotation of the drive shaft 38 is transmitted to the transmission shaft 34 via the drive bevel gear 36, and the rotation of the transmission shaft 34 is transmitted to the transmission spiral gear 35. is transmitted to the rotating shaft 5 via.

Then, as the rotation shaft 5 continues to rotate in the direction in which the height of the top plate 1 becomes lower, the upper small diameter portion 55 provided above the threaded portion 51 screwed into the nut 61 penetrates into the nut 61. The state will be as follows.

At this time, the upper stopper part 54 is attached to the nut seat 62.
, and the downward movement of the rotating shaft 5 is stopped.

That is, even if the handle 4 continues to be rotated, the rotation shaft 5 does not engage with the nut 51, so that the top plate 1 does not descend by simply rotating, but is in the lowest state. (Fig. 1) Next, when the handle 4 is rotated in the direction in which the top plate 1 is raised, the nut 61 is in pressure contact with the upper end of the threaded part 51 by the spring 63, so the threaded part 51 of the rotation shaft 5 immediately tightens the nut 61. After the nut 61 descends slightly, it comes into contact with the upper surface of the upper joint material 121 of the fixed leg 12, and then the rotating shaft 5 rises while rotating.
Raise the top plate 1.

Next, a lower small diameter portion 5 is provided at the lower end of the threaded portion 51.
6 reaches the nut 61 and eventually penetrates into the nut 61, the top plate 1 stops rising, and the lower stopper part 57 is inserted into the upper joint material 1.
21 to prevent the rotating shaft 5 from slipping out of the nut 61 (that is, the lifting leg 11 slipping out from the fixed leg 12) even if the top plate 1 is lifted.
The lower end of the threaded portion 51 and the upper end of the nut 61 support the elevating leg 11.

Even if the handle 4 is continued to be turned in this state, the rotation shaft 5 does not engage with the nut 61, so it simply rotates, and the top plate 1 does not rise, indicating that it is in the highest state.

Since the nut 61 is always in pressure contact with the lower end of the threaded part 51 due to the weight of the rotating shaft 5, the lifting legs 11, the top plate 1, etc., when the rotating shaft 5 is rotated in the direction in which the top plate 1 descends, , immediately screw the threaded part 51 and the nut 61.
are screwed together, and the rotating shaft 5 descends while rotating.

In the embodiment, the rotating shaft 5 is provided on the elevating leg and the threaded part 6 is provided on the fixed leg, but if it is turned upside down, the rotating shaft 5 is provided on the fixed leg and the threaded part 6 is provided on the elevating leg. You can also try to make a profit.

<<Effects>> As mentioned above, the present invention has a simple structure in which small diameter parts smaller than the root diameter of the threaded part are formed at the upper and lower ends of the threaded part that is screwed into the nut, and the top plate has the highest and lowest heights. If the handle is positioned in the right position, the rotation axis will rotate freely, and there will be no stress on the handle and there will be no risk of damage, and it can be manufactured at low cost.

Furthermore, when the top plate is at its lowest position, the nut is pressed into contact with the end of the threaded part by a spring, so when the top plate is raised, the nut and threaded part are immediately screwed together, allowing smooth raising and lowering. I can do things.

In addition, since the upper and lower stoppers are formed on the rotating shaft, the highest and lowest heights of the top plate can be reliably maintained, which is a practical and useful idea.

[Brief explanation of the drawing]

Figure 1 shows an enlarged vertical sectional view of the main parts of the present invention;
The figure is a perspective view of a desk equipped with the present invention, and Figure 3 is a perspective view of a desk equipped with the present invention.
Figure 4 is an enlarged cross-sectional view taken along line A-A in the figure, and Figure 4 is B-- in Figure 2.
FIG. 5 is an enlarged sectional view taken along the line B, and FIG. 5 is a sectional view taken along the line CC in FIG. 1...Top plate, 3...Height adjustment device, 4...Handle, 5...Rotation shaft, 51...Screw part, 55, 5
6... Upper and lower small diameter parts, 54, 57... Upper and lower stopper parts, 6... Fitting part, 61... Nut, 63...
Spring.

Claims (1)

[Scope of utility model registration request] In a height adjustment device for a desk or the like, which has a rotation shaft formed with a threaded portion that rotates at least when a handle is rotated, and a nut that is screwed into the threaded portion of the rotation shaft, the rotation shaft includes: At the upper and lower ends of the threaded part, upper and lower small diameter parts with a predetermined length and a dimension equal to or less than the root diameter of the threaded part, and upper and lower stopper parts for regulating the lifting height are formed.
A height adjusting device for a desk, etc., characterized in that the nut is located at either the upper or lower small diameter portion when the desk, etc. is at its minimum height, and is pressed against the end of the threaded portion by a spring.