JPH048816Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a backrest tilting device for controlling the tilting of the backrest of a chair.

[Prior Art] Conventionally, the tilting of the backrest of a chair was adjusted using a gas spring, but for example,
It is known from the publication No. 53-130008. In the device described in this publication, a backrest mounting frame 6 is pivotally attached to the rear end of the seat plate mounting frame 4 by a connecting shaft 10, and the backrest mounting frame 6 and the seat plate mounting frame 4 are connected to each other. Both ends of a gas spring 13 are pivotally connected to the supporting shafts 11 and 12, and an operating lever 19 for opening and closing the push valve 15 of the gas spring 13 is pivoted to the seat plate mounting frame 4. It becomes.

[Problems to be solved by the invention] In the above-mentioned conventional technology, the gas spring 13 and the operating lever 19 are separately attached to the seat plate mounting frame 4, so the assembly is troublesome and time-consuming.
Further, there is a problem in that production costs are high, such as requiring machining to attach the operating lever 19 to the seat plate mounting frame 4.

[Means for Solving the Problems] The present invention fixes a connecting member 16 to one end of the gas spring 13, pivots the connecting member 16 to a support shaft 12 installed on the backrest mounting frame 6, and
The other end of the gas spring 13 is pivotally supported on a support shaft 11 installed on the seat plate mounting frame 4, and the connecting member 16 is passed through a key-shaped horizontal hole 18, so that the push valve 15 of the gas spring 13 is inserted into the horizontal hole 18. At the same time, an operating lever 19 is inserted into the horizontal hole 18, and the operating lever 19 is swung in the axial direction of the gas spring 13 to open and close the push valve 15. By locking the tip of the operating lever 19 to 18b, the push valve 15 can be fixed in the open state.

[Function] When the push valve 15 of the gas spring 13 is opened by the operation lever 19, the gas spring 13
can be freely expanded and contracted, and the backrest mounting frame 6 can be tilted to any angle. Furthermore, when the operator releases the operating lever 19, the push valve 15 closes, the length of the gas spring 13 is fixed, and the angle of the backrest mounting frame 6 is fixed.

On the other hand, the operating lever 19 is attached to the key portion 18b of the horizontal hole 18.
By locking the tip of push valve 1
5 can be maintained in the open state.

[Example] In FIG. 1, a support 3 is erected at the center of a radial leg 2 with a caster 1 attached to the tip,
A seat plate mounting frame 4 having a cross-sectional shape is attached to the upper end of the support column 3, and a seat plate 5 is attached and fixed.

Reference numeral 6 denotes a backrest mounting frame that supports the lower end of the backrest mounting rod 7, through which the backrest mounting rod 7 is inserted and fixed.

A connecting shaft 10 is attached to the rear end of both side walls 8, 8 of the seat plate mounting frame 4 and the upper end of both side walls 9, 9 of the backrest mounting frame 6.
The seat plate mounting frame 4 is pivotally connected by passing through the
A support shaft 11 is installed on both side walls 8, 8 at approximately the center of the support shaft 11, and a support shaft 11 is installed on both side walls 9, 8 at the lower end of the backrest mounting frame 6.
A support shaft 12 is installed at 9.

Reference numeral 13 denotes a gas spring, which is a conventionally known gas spring formed so that the piston rod 14 expands and contracts by pushing a push valve 15 at the tip of the piston rod 14 protruding from the front end of the cylinder portion. The gas spring 13 is connected to the piston rod 1
4 is provided with a thread groove to screw and secure one end of a connecting member 16 (described later), and the connecting member 16
A support shaft 12 whose other end is mounted on the backrest mounting frame 6
The support shaft 11 is pivoted to the seat plate mounting frame 4 and has a rod 17 projecting from the rear of the cylinder part.
The seat plate mounting frame 4 and the backrest mounting frame 6 are connected by a gas spring 13.

The connecting member 16 has a key-shaped horizontal hole 18 in the center.
is inserted through the gas spring 13 so that the push valve 15 of the gas spring 13 faces the inside of the horizontal hole 18.
Insert the operating lever 19 inside. The operating lever 19 is supported on a fulcrum by a cylindrical portion 20 protruding from one end of the horizontal hole 18, and is swingable in the axial direction of the gas spring 13. A recess 21 is provided at the tip of the operating lever 19 so as to engage the push valve 15 at the tip of the piston rod 14.

When the tip of the operating lever 19 faces the elongated hole 18a of the horizontal hole 18, it is in a position where it does not press the push valve 15, and the operating lever 19 can be moved from the solid line in FIG. 4 to the chain line position. The push valve 15 is pressed to open it. Also, when the operating lever 19 is moved in the state shown by the chain line in FIG. 4, the operating lever 19 is moved to the fifth position.
When the operating lever 19 is pulled up from the solid line to the chain line position, the tip of the operating lever 19 is engaged with the key portion 18b of the horizontal hole 18, so that the push valve 15 can be maintained in a pressed state.

In the figure, 22 is a seat plate fixing plate fixed perpendicularly to the front end of the seat plate mounting frame 4, and 23 is a backrest fixed to the upper part of the backrest mounting rod 7.

Next, the use of the backrest tilting device of the present invention constructed as described above will be explained. When the seated person moves the operating lever 19 from the solid line to the chain line position in FIG.
is pushed out by the gas pressure and pushes the lower end of the backrest mounting frame 6 rearward, tilting the backrest 23 from the solid line position in FIG. 3 to the chain line position in the same figure. At this time, if the seated person puts their weight on the backrest 23, the backrest will stop at an arbitrary angle, and by releasing the operating lever 19, the push valve 15 will close, the gas spring 13 will be locked, and the backrest 2
3 is fixed in a desired tilted state.

Furthermore, when the operating lever 19 is pulled up to the position shown by the chain line in FIG.
The robot can swing back and forth, making movements that follow the posture of the body.

[Effects of the invention] As mentioned above, the backrest tilting device of the invention has the connecting member to which the operating lever is attached integrally fixed to the gas spring, so special processing is not required to attach the operating lever to the seat plate mounting frame. There is no need to apply it. This simplifies the design and assembly of the chair and reduces production costs.

[Brief explanation of the drawing]

The figures relate to one embodiment of the present invention, in which Fig. 1 is an overall perspective view of the chair, Fig. 2 is a side view of the device of the present invention, Fig. 3 is a side view partially shown in section, and Fig. 4. is a cross-sectional view taken along line A-A in Figure 2, and Figure 5 is a cross-sectional view taken along line B in Figure 2.
-B line sectional view, and FIG. 6 is a partially sectional side view showing a conventional example. 4...Seat plate mounting frame, 6...Backrest mounting frame, 1
1, 12...Support shaft, 13...Gas spring,
15... Push valve, 16... Connection member, 1
8...Horizontal hole, 18b...Key part, 19...Operation lever, 23...Backrest.

Claims (1)

[Scope of utility model registration request] Pivotally attach the backrest mounting frame to the rear end of the seat plate mounting frame,
In the chair back tilting device in which the backrest mounting frame and the seat plate mounting frame are connected by a gas spring to control the tilting of the backrest, a connecting member is fixed to one end of the gas spring, and the connecting member is attached to the backrest mounting frame. The other end of the gas spring is pivotally supported on a support shaft installed on the seat plate mounting frame, and the connecting member is provided with a key-shaped horizontal hole to allow a push valve of the gas spring to be connected. At the same time, insert the operating lever into the horizontal hole, swing the operating lever in the axial direction of the gas spring to open and close the push valve, and insert the operating lever into the key part of the horizontal hole. A chair back tilting device characterized in that a push valve can be fixed in an open state by locking its tip.