JPH0242175Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a height adjustment device for a back panel of a desk.

[Conventional technology]

In desks used in financial institutions and general offices, a back panel is installed along the back of the desk to hide the eyes, but the height of this back panel is limited due to various reasons such as customer service requirements. It is desirable that the configuration be adjustable.

As a means to do so, the prior art Act Publication No. 56-25586
In the publication, the back panel is configured to be double layered, upper and lower, the upper panel is fitted into the lower panel so as to be movable up and down, and the lower panel has a substantially vertical guide wall and faces the guide wall and tapers downward. A vertically movable cylindrical piece member is provided between the two guide walls, and a vertically movable cylindrical piece member is urged downward by a spring, and a vertically long piece member fixed to the upper panel is provided between the vertical guide wall and the piece member. We are proposing a configuration with guide strips.

[Problem that the invention attempts to solve]

According to this prior art, when the upper panel is lowered, its guide strip is pressed against the vertical guide wall and lowered by the downward wedge action of the inclined guide wall in the lower panel and the downwardly biased piece member. On the other hand, when the top panel is pulled upward, the bridge member moves slightly upward to release the wedge action and smoothly pull up the top panel.

However, when pulling up, the upper panel, which has a considerable weight, must be held in an awkward position, which imposes a heavy burden on the operator when adjusting the height.

Furthermore, as a means of locking the upper panel at a desired height position, the frictional force between the inclined guide wall of the lower panel and the bridge member is utilized, but as these members wear out, the frictional force decreases. If the upper panel is lowered, there is a risk that the upper panel may slide down unexpectedly, and the function to stop the upper panel at a predetermined height may not be complete.
Furthermore, the downward movement of the upper panel does not stop until the wedge action between the upper panel and the lower panel is exerted, making it difficult to finely adjust the height position of the upper panel.

The present invention has been made to solve these problems.

[Means for solving problems]

In order to solve this problem, the present invention provides a back panel along the back of the desk so that it can move up and down, and a drive shaft that is rotatably driven by the handle operation is supported on the underside of the desk top. The rear panel is configured to move up and down as the shaft rotates, and the drive shaft is fitted into a lock member that is non-rotatably mounted on the desk, and an engaging portion provided on the outer periphery of the drive shaft locks the lock member. The drive shaft or the lock member is configured to be slidable in the axial direction of the drive shaft so as to be engaged with and disengaged from the member, and the drive shaft or the lock member is biased by a spring in the engagement direction, and is driven by pressure from the handle. The shaft or the lock member is configured to slide in the direction in which the engagement between the two is released.

[Action/Effect]

In this configuration, by interlocking and connecting the drive shaft and the rear panel via a connecting means such as a chain or wire, the rear panel can be raised and lowered as the drive shaft rotates. Since the engaging portion provided on the front panel and the non-rotatable locking member are spring-biased to engage each other, under normal conditions, the drive shaft is locked unrotatably and the back panel is stopped without being able to move up or down. On the other hand, when the handle is engaged with the drive shaft and the handle is pressed against the drive shaft or the lock member in the axial direction, the drive shaft or the lock member moves in the disengagement direction against the spring force. The drive shaft is unlocked and can rotate freely.

Therefore, by pressing the handle and rotating the handle while the drive shaft is unlocked, the rear panel can be raised and lowered.
When the pressure with the handle is stopped when the rear panel reaches the desired height position, the drive shaft or locking member slides in the locking direction by the spring force, the drive shaft is locked so that it cannot rotate, and the rear panel remains at that height. It will stop at that position.

The drive shaft of the present invention can be arranged so that its axis runs along the front-rear or left-right direction of the desk, and the handle can be inserted from the front end of the desk or from the left and right sides of the desk accordingly.

In this way, the present invention allows the back panel to be moved up and down by operating the handle from the front or side of the desk.
You can raise and lower the back panel in a very natural posture without having to take any forced postures, and you can raise and lower the back panel and lock/unlock it with one hand by operating the handle, which is necessary for adjusting the height of the back panel. It has the effect of reducing labor.

Furthermore, when the drive shaft is unlocked and the rear panel can move up and down, the handle is always held, and when the drive shaft is unlocked, the rear panel maintains its height position. Even if the drive shaft is not gripped by hand, the back panel will not fall by itself when the drive shaft is unlocked, and the back panel will not fall and damage the back panel itself or surrounding members.

Furthermore, since the raising and lowering of the rear panel is linked to the rotation of the drive shaft, when the drive shaft is locked so that it cannot rotate with the locking member, the rear panel will surely stop at that height position, and the raised rear panel This has the effect of not only preventing the top panel from slipping down unexpectedly, but also allowing fine adjustment of the height of the top panel.

〔Example〕

Next, an embodiment of the present invention will be described based on the drawings. In the drawings, reference numeral 1 indicates a pair of left and right legs 2,
This is an office desk consisting of a desk top plate 3 supported by two legs, and a back panel is attached to the back side of the desk 1 via a guide member 4 having a U-shaped cross section fixed to the back side of both legs 2. 5 is mounted so as to be vertically movable, and furthermore, a rear curtain plate 6 is fixed between the back surfaces of both the guide members 4, 4.

On the lower surface of the left side edge of the desk top plate 3, there is a longitudinal longitudinal drive shaft 7 which is rotatably driven by a handle 8.
is rotatably supported, and the back panel 5 is configured to be able to move up and down as the drive shaft 7 rotates.

That is, a drive shaft 7 is rotatably supported by a bracket 9 fixed to the lower surface of the desk top plate 3 and a case 10 having a box-shaped cross section, and a rotating shaft 8a of a handle 8 is attached to the base end of the drive shaft 7. While the drive shaft 7 is detachably inserted and locked, a chain sprocket 11 is fitted to the tip of the drive shaft 7.

On the other hand, a chain sprocket 14 is rotatably supported via a pair of front and rear support pieces 13 in a cross beam member 12 with an upward opening and a U-shaped cross section fixed across the inner surfaces of the legs 2, 2. Both ends of the chain 15 wound between the upper and lower pair of chain sprockets 11 and 14 are connected to the connecting member 16 having an L-shaped cross section and fixed to the inner surface of the back panel 5 via the upper and lower pair of mounting members 17, respectively. As a result, the back panel 5 is configured to move up and down as the drive shaft 7 is rotated using the handle 8.

A male spline body 18, which is an example of a locking part, is fixed with a pin 19 to a portion of the drive shaft 7 located inside the case 10, and the drive shaft 7 is formed to have a substantially rectangular cross section. A lock member 20 configured to be unrotatable in the case 10 is slidably fitted therein, and a spline groove 21 is formed in the inner diameter of the distal end of the lock member 20, so that the lock member 20 is driven. When the drive shaft 7 is moved toward the front of the desk along the axis of the shaft 7, the locking member 20 and the male spline body 18 are fitted to lock the drive shaft 7 so that it cannot rotate, and when the locking member 20 is slid toward the back of the desk 1, The spline fitting is released and the drive shaft 7
is configured to be rotatable.

A spring 22 biases the locking member 20 in the direction of fitting it into the male spline body 18 of the drive shaft 7. Furthermore, the handle 8 can be rotated integrally with the drive shaft 7 by fitting a locking pin 8b that passes through the fitting portion of the drive shaft 7 into an engagement groove 7a formed at the end of the drive shaft 7. In this case, the end face of the rotary shaft 8a is brought into contact with the locking member 20, and the rotary shaft 8a is pushed and slid from this abutting state. Reference numeral 23 is a stopper ring for preventing the drive shaft 7 from moving toward the back of the desk.

Reference numeral 24 designates a balance link mechanism for smoothly moving the rear panel 5 up and down, which includes two link rods 24a, 24 whose central portions are pivoted by a pin 25.
A pin 27, 28 is attached to each end of b to the cross beam member 12 and the support member 26 fixed to the back panel 5, respectively.
While being pivotally attached, the other ends of each link rod 24a, 24b are slidably attached to guide rails (not shown) fixed to the cross beam member 12 and the support member 26, respectively, via rotating rollers (not shown). By bringing them into contact with each other, the back panel 5 can move up and down along the vertical direction, and both link rods 24a, 24
A tension spring 30 is installed between the rear panel 4 and the rear panel 4 to bias the rear panel 4 upward. Further, at the end of the cross beam member 12, a pressing body 31 is provided which biases the end face of one link rod 24b with a spring 32 when the rear panel 5 is lowered to the lower end. This allows for lifting with light force.

In the above configuration, as shown in FIG. 8, by rotating the handle 8 while pressing the lock member 20 with the rotating shaft 8a of the handle 8, the spline fitting between the lock member 20 and the drive shaft 7 is released. Then, since the drive shaft 7 becomes rotatable, the back panel 5 can be moved up and down freely.
When the pressing by the handle 8 is stopped when the back panel 5 reaches the desired height position, the locking member 20 moves back by the force of the spring 22, the drive shaft 7 is locked so that it cannot rotate, and the back panel 5 also returns to that height position. It will stop at .

In this way, the back panel 5 is raised and lowered by operating the handle 8 located in front of the desk 1.
The back panel 5 can be raised and lowered in a natural posture, and
Since the rear panel 5 can be raised and lowered and the drive shaft 7 can be locked and unlocked with one hand, the height of the rear panel 5 can be adjusted easily and effortlessly compared to the conventional method of pulling it up by hand. Drive shaft 7
and the rear panel 5 are interlocked and connected via a chain 15, and the drive shaft 7 is reliably locked by spline fitting with the locking member 20, so that the rear panel 5 that has been raised will not accidentally slip down. There is none.

In the embodiment, the drive shaft 7 is locked and unlocked by sliding the lock member 20, but the lock member 20 is fixed to the lower surface of the top plate 3, and the drive shaft 7 is aligned with its axis. The drive shaft 7 may be locked or unlocked by sliding it along the chain sprocket 11.
(The drive shaft 7 is configured to be able to slide freely against the desk, and the drive shaft 7 is biased toward the front of the desk by a spring.)

In addition, spline fitting was used in the embodiment as a means for making the drive shaft unrotatable with the lock member, but clutch teeth that can freely engage are cut into the end face of the lock member and the end face of the ring body fitted to the drive shaft. Other means may be used, such as configuring the lock member or the drive shaft to engage and disengage from each other as either the lock member or the drive shaft moves back and forth. Furthermore, in the embodiment, the drive shaft was provided along the left edge of the desk top so as not to interfere with the person sitting at the desk, but the drive shaft may be provided along the right edge of the desk top. Needless to say.

Alternatively, the drive shaft 7 is disposed so as to extend along the left-right direction of the desk, and its base end is exposed to the side of the desk so that the handle 8 can be rotated from the side of the desk, and the chain sprocket 11 , 14, etc., and the chain may be wound between them and a chain sprocket attached to the drive shaft 7.

Furthermore, the means for interlocking the rotation of the drive shaft and the vertical movement of the back panel is not limited to the chain used in the embodiment, but may also be a timing belt or wire. When lifting the back panel using a wire, as shown by the two-dot chain line in FIG. 5 can be wound around a drum (not shown) attached to the tip of the drive shaft 7 via the intermediate pulley 33. The desk top plate 3
Even when the rear panel 5 is provided along the side edges of the rear panel 5, there is an advantage that the rear panel 5 can be vertically moved in a balanced state.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a perspective view from the rear of the desk, FIG. 4 is an enlarged cross-sectional view of FIG. 2, FIG. 5 is a cross-sectional view of FIG. 1, FIG. 6 is a cross-sectional view of FIG. 5, and FIG. 7 is a cross-sectional view of FIG. FIG. 8 is a diagram showing the effect. 1...Desk, 2...Legs, 3...Desk top, 4...
Guide member, 5... Rear panel, 6... Rear curtain plate, 7... Drive shaft, 8... Handle, 11, 14
...Chain sprocket, 15...Chain,
DESCRIPTION OF SYMBOLS 10... Case, 18... Male spline body as an example of a locking part, 20... Lock member, 21...
Spline groove, 22... spring, 24... link mechanism.

Claims (1)

[Scope of utility model registration request] A back panel is provided along the back of the desk so as to be movable up and down, while a drive shaft is rotatably supported on the underside of the desk top plate, and the back panel is rotated as the drive shaft rotates. The drive shaft is configured to move up and down, and the drive shaft is fitted into a lock member that is non-rotatably mounted on the desk, and the drive shaft is configured such that the engaging portion provided on the outer periphery of the drive shaft engages and disengages from the lock member. Alternatively, the lock member is configured to be slidable in the axial direction of the drive shaft, and the drive shaft or the lock member is biased by a spring in the engagement direction, and the drive shaft or the lock member is pressed by the handle to engage the drive shaft or the lock member. A device for adjusting the height of a back panel of a desk configured to slide in a direction of uncoupling.