JPH0536046B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of a tilting device in which a seat support in a chair can be tilted back and forth depending on how a person sitting on the seat rests.

[Conventional technology]

Modern offices use OA equipment, so
Workers often sit on chairs for long periods of time, and in that case, if the seat support is fixed in a substantially horizontal position,
The front end of the upper surface of the seat support presses against the lower surface of the seated person's thighs, causing severe fatigue, and conversely, even if the seated person leans back with his/her upper body to straighten his/her back, the seat support will tilt backwards. Because I didn't do it, I had the inconvenience of not being able to take a comfortable position.

In order to solve this inconvenience, for example, in the prior art Japanese Utility Model Publication No. 11794/1983, the upper end of the leg support of the chair and the middle part of the seat support in the front and back direction are pivotally connected with a horizontal pin so that they can be tilted back and forth. A bolt with a nut screwed onto the lower end is inserted in the vertical direction into the support piece on the seat support side and the support piece on the leg support side corresponding to discloses a configuration in which a disc-shaped spring is fitted into each of the bolts.

[Problem that the invention seeks to solve]

According to this configuration, the seat support of the chair can take any of the following postures depending on how the weight of the seated person is applied:
Since the front and rear middle parts of the seat support are only pivotally attached to the leg support with horizontal pins, when tilting forward from a horizontal position, the front end of the seat support descends, while the rear end of the seat support rises. Therefore, the line of sight of a person sitting upright whose hip bones are located on the rear end of the seat support is different from the line of sight of a person sitting upright whose bones are located on the rear end of the seat support, when the seat support is in a horizontal position. This means that it will rise above the line of sight of the seated person.

Therefore, when the seat support takes a forward-leaning position from its normal approximately horizontal position, the line-of-sight height position relative to office automation equipment, etc. changes upward, and the seated person must temporarily move forward in order to obtain the optimal height for the equipment. Move your hips or
It is necessary to predict the height fluctuation in advance and set the height position of the seat support relative to the leg support high,
This will make office work inconvenient.

On the other hand, when tilting backwards from a horizontal position, there is a problem in that the front end of the seat support rises too much and presses the front lower surface of the thighs of the person seated on the seat support.

The present invention aims to solve such problems.

[Means for solving problems]

Therefore, in the present invention, the proximal ends of the forward-facing link and the backward-facing link are pivotally connected to the fixed body that connects forward to the upper end of the leg support of the chair, and the front end of the forward-facing link and the upper part of the fixed body are connected to each other by pins. The front end of the seat support is rotatably connected to the front end of the seat support disposed on the seat support through a horizontal axis, and the forward-facing link is urged upward and its upward rotation angle is restricted. A slide shaft is provided in a longitudinal longitudinal guide portion formed on the rear side of the body so as to be slidable back and forth, the rear end of the backward link is pivotally connected to the slide shaft, and the slide shaft is biased in a forward movement direction. It is structured as follows.

[Action and effect]

According to the present invention, the front end of the forward-facing link whose base end is pivotally connected to the fixed body connected forwardly to the upper end of the leg support is pivotally connected near the front end of the seat support above the forward-facing link, while the front end of the backward-facing link The rear end is attached to the guide part near the rear of the seat support via a slide shaft, so if a person's weight shifts toward the front in a reporting posture, the front end of the forward-facing link will fall against the upward biasing force. On the other hand, the rear end of the backward link is pulled forward by the forward biasing force while connected to the seat support, so that the rearward link moves in the upright direction. In this case, the forward link is urged to rotate upward by the upward urging means, and the rearward link is urged to move forward by the forward urging means.

Therefore, when the seat support leans forward, the front end of the seat support moves downward, causing the overall height of the seat support to drop slightly, while the rear end of the seat support lifts up. , there is almost no difference in height between the line of sight of a person sitting in a substantially horizontal position and the line of sight of a person sitting on a seat receiver in a forward-leaning position.

Due to this effect, workers who handle OA equipment, etc. only need to adjust the height of the seat support relative to the leg support while sitting on the substantially horizontal seat support.
This allows the user to work comfortably without having to move his or her hips when entering the service position in which the seat support is tilted forward.

In addition, when the seated person puts his or her weight on the rear side of the seat support in order to take a comfortable posture, the upward biasing force acting on the forward-facing link becomes dominant over the downward force due to the body weight at the front end of the seat support. The upward rotation angle of the link is restricted and the front end of the link is held at a predetermined height. The slide shaft, whose rear end is mediated, moves rearward along the guide part formed on the side of the seat support by the forward biasing force, and rotates so that the rear end of the rearward link faces downward. As it moves, the seat support can tilt backward about the transverse axis that is the pivot point with the front end of the forward-facing link.

In this case, since the horizontal shaft is pivoted near the front end of the seat support, the front end of the seat support remains at a substantially constant height, and the top surface of the seat support remains at an appropriate angle. It tilts and does not lift the seated person's legs off the floor. Therefore, the lower surface of the thigh near the knee of the seated person is not strongly pressed.

As described above, in the present invention, when the seat support is tilted forward from a substantially horizontal state, the level of the seated person's line of sight does not fluctuate up and down, but when it is tilted back, it does not press the seated person's thighs. This has the advantage that it is possible to provide a chair that is extremely comfortable to sit on, and the structure thereof is also extremely simple.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. A pair of left and right seat supports 7, 7, each having a seat plate 8 with a backrest and a cushion fixed to it with screws 10, are arranged above the fixed body 3 so as to project forward. Between the pair of seat supports 7, 7 and the fixed body 3, forward-facing links 5, 5 whose front sides are connected by a flat plate 5a and a pair of left and right backward-facing links 6, 6 are arranged in an X-shape when viewed from the side. It is to be established.

The base ends (rear ends) of the pair of forward-facing links 5, 5 are pivotally connected to the horizontal shaft 11 that connects to the rear positions of the left and right side plates 4, 4 of the fixed body 3, so as to be able to move up and down,
Its front end is pivotally connected to the seat supports 7, 7 in the vicinity of their front ends via a horizontal shaft 12 so as to be vertically movable.

On the other hand, the left and right side plates 4 in the fixed body 3,
4, the base end (front end) of the rearward links 6, 6 is pivoted so as to be vertically movable, and the rear end of the pair of rearward links 6,6 is pivoted to the slide shaft 14. is fitted into a guide portion 15 in the form of a longitudinal longitudinal slot bored in the rear side of the pair of seat supports 7, 7 so as to be slidable back and forth, and the slide shaft 14 and the seat support are A forward biasing means 17 consisting of a tension spring is mounted on a support pin 16 connected to the bodies 7, 7 to bias the slide shaft 14 forward.

In the embodiment, the forward-facing links 5, 5 are disposed between the seat supports 7, 7 and the outer surfaces of the left and right side plates 4, 4 of the fixed body 3, and the backward links 6, 6 are arranged between the seat supports 7, 7 and the outer surfaces of the left and right side plates 4, 4 of the fixed body 3. It is placed inside.

Also, the front flat plate 5a of the pair of forward facing links 5, 5
Between the pressing piece 18, which has an inverted L-shaped cross section and bends backward from the front end, and the support piece 19, which projects from the inner surface of the front end of the fixed body 3, there is provided a support piece 19 so that the front ends of the forward-facing links 5, 5 meet upwardly. While an upward biasing means 20 consisting of a biasing compression spring is mounted, the forward-facing link 5 is , 5 is regulated so that the upward rotation angle does not exceed a certain level.

The posture of the seat plate 8 shown by the solid line in FIG. be.

In this state, the slide shaft 14, which is controlled by the rear ends of the backward links 6, 6, is moved by the forward biasing means 17 so that the guide portion 15 in the seat supports 7, 7 approaches the front end.
The forward facing links 5, 5 supported by the upward biasing means 20 mounted between the fixed body 3 are stabilized in a downward facing state against the weight of the person. Therefore, the upper surface of the seat plate 8 is approximately horizontal.

Next, when the weight of the seated person is shifted toward the backrest, the force of the upward biasing means 20 becomes dominant, and the forward-facing links 5, 5 rotate upward until they come into contact with the regulating pieces 21, 21; The moment due to the weight of the forward biasing means 17 becomes dominant over the force of the forward biasing means 17, causing the backward links 6, 6 to pivot downward. At this time, since the slide shaft 14 at the rear end of the rearward links 6, 6 is regulated by the front and rear longitudinal guide portions 15, 15 of the seat supports 7, 7, the seat supports 7, 7 are positioned near the front ends of the seat supports 7, 7. It will tilt rearward about the horizontal character shaft 12 as the center of rotation.

Therefore, the front end side of the seat plate 8, which is tilted backward integrally with the seat supports 7, 7, rises only a little while the rear end side drops significantly (see the dashed line in Fig. 1), so that the seated person cannot Even if you take a comfortable posture resting on the backrest, there is no pressure on the seated person or the lower front of the thighs. Contrary to the above, the weight of the person sitting on the seat plate 8
By hanging it in a position near the front end, it is possible to change from the normal state shown by the dashed line in FIG. 5 to the forward leaning position shown by the solid line.

That is, by applying the body weight to a position near the front end of the seat plate 8, the upward biasing means 20 is contracted by the pressing piece 18 at the midpoint of the forward-facing links 5, 5, and the forward-facing links 5, 5 are moved toward the horizontal axis 11 at the rear end. The rear links 6, 6 are restricted to a position near the rear end of the seat supports 7, 7 via the slide shaft 14 and the guide portion 15, so that the seat supports and, in turn, the seat Since the board 8 tilts forward in such a way that its front end descends and its rear end rises, the line of sight level of the person sitting on the seat board 8 is the same as the line of sight level when the seat board 8 is approximately horizontal. The position is approximately constant, and a seated person who bends forward to operate OA equipment or the like can immediately start working without shifting the position of his or her hips relative to the seat plate 8.

Incidentally, instead of the pair of left and right plate-shaped seat supports 7, 7 in the above embodiment, the seat supports may be formed to have a downward U-shaped cross section. Further, the forward biasing means 1
In order to adjust the biasing force of the forward biasing means 17 and the upward biasing means 20, the forward and backward position of the support pin 16 and the height position of the support piece 19 may be changed. Means 20
Instead of a spring, a gas spring or other elastically adjustable biasing means may be used.

In each of the above-mentioned embodiments, the guide portion 15 provided on the seat support 7 may be formed in the shape of a rail with a horizontally U-shaped cross section, instead of being in the shape of a slot.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a side sectional view of the main part of the chair, FIG. 2 is a partially cutaway plan view of FIG. 1, and FIG. 3 is a cross-sectional view of FIG. 2. Figures 4 and 4 are cross-sectional views taken from the side in Figure 2, and Figure 5 is a side view in a forward tilted state. 1...chair, 2...leg support, 3...fixed body,
4, 4... Left and right side plates, 5, 5... Forward link, 6, 6... Rearward link, 7, 7... Seat support, 8... Seat plate, 11... Horizontal axis, 12... Horizontal Axis, 13...Pin, 14...Slide axis, 15...
...Guide portion, 16... Support pin, 17... Forward biasing means, 28... Pressing piece, 20... Upward biasing means, 21, 21... Regulating piece.

Claims (1)

[Claims] 1. The proximal ends of a forward-facing link and a rearward-facing link are pivotally connected with a pin to a fixed body that is attached forward to the upper end of the leg support of a chair, and a seat is attached to the front end of the forward-facing link and a seat disposed on the fixed body. A portion near the front end of the seat support is rotatably connected via a horizontal axis to urge the forward-facing link upward and to restrict its upward rotation angle. A slide shaft is provided in the longitudinal longitudinal guide portion formed in the front and rear so as to be slidable back and forth, and the rear end of the rearward link is pivotally connected to the slide shaft, and the slide shaft is biased in the forward movement direction. Chair tilting device.