JPH0223172Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a chair, and particularly to a structure of a chair that allows the angle of the backrest to be adjusted and the locking operation to be performed freely.

The purpose of this invention is to improve the functional characteristics of the chair in line with ergonomics.In particular, it is possible to freely adjust the angle of the backrest depending on the usage situation. The seat can automatically change its angle in response to changes in the seating area to provide a comfortable seating experience, and the backrest can be adjusted elastically as needed to provide a comfortable sitting position, such as when taking a break. It is an object of the present invention to provide a chair with a simple structure that can be tilted or rocked.

The configuration of this invention will be explained below based on illustrated embodiments.

In FIG. 1, the supporting leg 1 has a built-in gas spring, etc., and is extendable and retractable, although detailed illustrations are omitted, and the upper end of the supporting leg 1 is equipped with a box-shaped box made of die-cast molded product, etc. A seat support housing 2 is attached.

The back support frame 3 to which the backrest plate 21 is attached consists of a pair of left and right metal rods bent into a substantially L-shape when viewed from the side, and as seen in FIGS. Slightly wide band-shaped actuating plates 4, 4 are fixedly extended and positioned within the housing 2. And this actuating plate 4,4
The lower front end of the housing 2 is pivotally supported by pivots 5, 5 fixed in the housing 2, and the upper front end is connected to a plurality of spring mounting shafts 30 provided between the operating plates 4, 4. It is connected to four strong coiled traction springs 6 and 7. Therefore, by the force of these springs, the back support frame 3 is elastically biased in the forward tilting direction about the pivot shaft 5, and is capable of locking operation. The above four traction springs 6, 7
As shown in FIG. 2, the two outer springs 6, 6 are connected at one end to a shaft 22 fixed horizontally to the front end of the housing 2, and the other two inner springs 7, 7
is fixed at one end to a spring stopper plate 24 that is moved back and forth by an adjustment screw 20 with a handle 23 that penetrates the center of the front wall of the housing 2 and is provided so as to prevent movement in the axial direction. 20 allows the strength of the spring force acting on the actuating plate 4 to be adjusted.

As shown in FIGS. 1 and 2, a pair of left and right rocking seat frames 8, 8 each having an inverted L-shaped cross section are disposed on the outer surfaces of both sides of the housing 2, and the front ends thereof extend along the shaft 22. They are respectively pivotally connected to the housing 2. In addition, a rear seat support beam 9 is horizontally fixed to the rear upper surface of both rocking seat support frames 8,8.
The seat body 10 is supported by fixing its front and rear lower surfaces to the swing seat support frames 8, 8 and the rear seat support frame 9, respectively, with appropriate bolts or the like.

A lock plate 11 having an arcuate shape centered on the pivot shaft 5 is fixed between the rear ends of the actuating plates 4, 4. The lock plate 11 and the rear seat support beam 9 are connected at the center via a link 12 so that they are interlocked with each other. Therefore, when the back support frame 3 is now swung or tilted around the pivot 5, in response, the rear parts of the swing seat support frames 8, 8 will swing up and down around the shaft 22, and the The seat body 10 supported by the seat body 10 is tilted.

As shown in FIG. 6, the lock plate 11 is provided with a plurality of engagement holes 13 vertically arranged on both the left and right sides of the lock plate 11 at successively different heights. And each of these engagement holes 1
Facing rows 3 and 13, Figures 1, 2 and 4
As shown in the figure, a pair of left and right knock pins 14 made of synthetic resin are supported by a slide guide 25 fixed to the inner bottom surface of the housing 2 so as to be movable forward and backward. A coil spring 15 is attached to the rear part of the lock pin 14 (see FIG. 4), and the lock pin 14 is always urged in the advancing direction, so that the tip end can be inserted into any engagement hole 13 of the lock plate 11. It has become something that can be enjoyed. In addition, by hollowing out the middle part in the width direction of the dowel pin 14 in the longitudinal direction, the dowel pin 14 has a locking step part 16a at the upper end, which slopes down toward the rear, as shown in FIG. An inclined cam surface 16 is formed. On the other hand, on the left and right slide guides 25, 25, there are drive levers 18 having a downward U-shaped cross section, and vertical portions 18 on both sides thereof.
a, 18a into the grooves 2 of both slide guides 25, 25.
6, 26, and its rear end is pivotally connected by a shaft 27, so that it can swing freely. Vertical portions 18a, 1 on both sides of this drive lever 18
8a, a hook-shaped cam portion having a locking step portion 16a of the knock pin 14, a corresponding locking step portion 17a facing the cam surface 16, and a cam surface 17 protrudes downward. It is set up in a shape. When the drive lever 18 is strongly swung downward, the knock pin 14 is moved in and out against the spring 15 by the action of the cam surfaces 16 and 17.
When it is removed from the engagement hole 13, it can be maintained as it is by engaging the locking step portions 16a and 17a as shown in FIG.

The lever handle 19 for operation is attached to the housing 2
It penetrates the side wall of the drive lever 18 and is pivotally supported by a bearing piece 28 for seesaw movement, and its inner tip is connected to the upper wall on the free end side of the drive lever 18 via a connecting pin 29. Accordingly, the seesaw action of the lever handle 19 moves the drive lever 18 to control the locking and unlocking of the back support frame 3.

In the chair of the above structure according to this invention, when either the left or right knock pin 14 is fitted into the engagement hole 13 as shown in FIG.
The back support frame 3 has a lock plate 11 and a knock pin 1
4. It is locked onto the housing 2 side via the slide guide 25 and held in a fixed state at a predetermined angle. From this state, when the outer end of the lever handle 19 is strongly pulled upward, the drive lever 18 swings downward, and the knock pin 14 is retracted by the abutting and guiding action of the cam surfaces 16 and 17, and is engaged. Matching hole 13
be removed from. Then, since the locked state of the back support frame 3 is released, the back support frame 3 is released from the traction springs 6 and 7.
It becomes elastically tiltable due to the action of This unlocked state is maintained even if the lever handle 19 is released due to the engagement of the locking steps 16a and 17a of the cam surfaces 16 and 17, as shown in FIG. Now, backrest plate 2
1 can be kept in a so-called free-locking state, making it suitable for use during breaks and the like. On the one hand,
If you want to prevent the rather harmful tilting of the backrest plate 21 and fix it at a predetermined angle for use at work, etc., put your weight on the backrest plate 21 to bring it to the desired angle, and then press the lever handle. 19
Press down on the tip. Then, as the drive lever 18 moves upward, the knock pin 14 moves forward under the action of the spring 15, and fits into the engagement hole 13 at the corresponding position or the position closest to it, thereby achieving the above-mentioned fixed state. Moreover, as the backrest plate 21 tilts or changes its angle,
By moving the lock plate 11 up and down, the link 1
2, the rocking seat support frames 8, 8 are moved in response. In addition, this reaction causes the rear part of the seat body 10 to tilt lower as the backrest plate 21 is tilted significantly rearward, making it difficult to sit while not only at work but also when resting. This is effective for maintaining a comfortable posture.

As mentioned above, this idea allows you to freely set the angle of the backrest and keep it in a freely elastic rocking state as needed. It is also possible to provide a chair that automatically changes its angle and is suitable for ergonomics.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention; Fig. 1 is a perspective view of a half-cutaway state with the seat and back plate removed, Fig. 2 is a plan view thereof, and Figs. 3 and 4 are Fig. 2. - line and - line cross section,
FIG. 5 is a sectional view of a portion corresponding to FIG. 4 when the dowel pin is retracted to a free locking state, and FIG. 6 is a sectional view taken along the line of FIG. 4. DESCRIPTION OF SYMBOLS 1... Support leg, 2... Seat support housing, 3... Back support frame, 4... Band-shaped actuating plate, 5... Pivot, 6, 7...
... Traction spring, 8 ... Rocking seat support frame, 9 ... Rear seat support frame, 10 ... Seat body, 11 ... Lock plate, 1
2...Link, 13...Engagement hole, 14...Knock pin, 15...Spring, 16...Cam surface, 16a...
... Locking step portion, 17 ... Cam surface, 17a ... Locking step portion, 18 ... Drive lever, 19 ... Lever handle for operation.

Claims (1)

[Claims for Utility Model Registration] (1) A belt-shaped actuator in which a back support frame 3, which is approximately L-shaped in side view, is attached to the lower end of the seat support housing 2 attached to the upper end of the support leg 1 in an extended manner. The lower front end of the plate 4 is pivotally supported by a pivot 5, and the upper front end is connected to traction springs 6 and 7, so that it is always elastically biased in the forward tilting direction, and both sides of the housing 2 Along the outer surface, a pair of left and right rocking seat support frames 8, 8 are pivotally connected to the housing 2 at their front ends, and are swingably disposed, and the front parts of both rocking seat support frames 8, 8 and their rear parts are A seat body 10 is fixedly supported at both the front and rear portions by a rear seat support beam 9 which is horizontally fixed in between, and furthermore, an arcuate lock plate 11 centered around the pivot shaft 5 is provided at the rear of the actuating plate 4. is fixed, and the lock plate 11
and the rear seat receiving piece 9 are connected via a link 12, and a knock pin 14 is movable forward and backward facing 13 rows of a plurality of vertically arranged engagement holes bored in the lock plate 11. The locking step 1 is always biased in the advancing direction by a spring 15 and is formed on the knock pin 14.
A driving lever 18 facing the cam surface 16 having a corresponding locking step 17a and having the same cam surface 17
is provided so that the dowel pin 14 can be retracted by actuation in the direction of the dowel pin, and is attached to the drive lever 18 so as to be capable of see-saw operation through the side wall of the housing 2. A chair characterized by having 19 tip parts connected to each other. (2) A utility model in which at least one of the traction springs 6 and 7 is configured such that the spring force acting on the actuation plate 4 can be adjusted by an adjustment screw 20 provided through the front wall of the housing 2. The chair described in Paragraph 1 of the registered claims.