JPH06500944A - work chairs, especially office chairs - Google Patents

Abstract

The working chair has a seat bearer (11), a seat (15) articulated on the seat bearer (11) and a squab bearer (25) with a squab (29). The squab bearer (25) has a spindle (23) on the seat bearer (11). One arm (27) is articulated on the squab (29) and the other (31) on the seat (15). The simple mechanical arrangement (20, 22, 23, 25, 35) thus formed causes the seat to be moved in one direction of rotation (47) when the squab bearer (25) is moved in the other (43). As in lying down and relaxing, the knee and hip joints thus undergo an extension. This produces a sound lordosis. The spindle (23) and the articulation axis (35) lie in a plane (36) inclined at about 70 DEG to the horizontal. Regardless whether a person is heavy or light, relatively little force on the squab (29) is needed to raise the seat (15). As the seat (15) and the squab (29) remain close together during any movement, the tendency for the shirt to be pulled out is prevented. The movement of the seat backwards and downwards when the squab is tipped backwards prevents blood congestion at the back of the knees.

Description

[Detailed description of the invention] work chairs, especially office chairs The present invention relates to a work chair, and more particularly, the present invention relates to a work chair, and in particular, the seat frame and the pivot of the commode are arranged on the seat frame. A seat that is rotatable forward and movable substantially horizontally with respect to the seat frame, and a second pivot. a backrest frame connected to the seat frame by a third pivot; The present invention relates to an office chair comprising a back rest and a back rest coupled to a back rest frame.

Many work chairs currently produced and used primarily as office chairs. are of the N order of synchronous work chairs, and they have an IR node with the slope of the backrest frame. Then, the inclination of the seat is adjusted at the same time. In known synchronized work chairs, the backrest When rotated in one direction, the seat also rotates in the same direction. However, in general, the rotation of the seat is only half the rotation of the backrest (US-A-2859799, C[I-A- 629945). In particular, this type of work chair has five drawbacks: Physiologically unnatural rotation of the seat, unfavorable impact on sitting posture, lack of weight balance , relatively expensive construction, and unsightly, out of keeping with current aesthetic requirements. It has the disadvantage of appearance.

These drawbacks are to some extent interrelated. For example, lack of weight balance and a compensator spring that counteracts the force exerted on the chair back by the user's weight. If the force adjustment is poor, the sitting posture will be further impaired as detailed below. It may happen.

Considering the movements of a person's joints when a person is normally standing up, the knee joint and hip joint It can be seen that elongation occurs in a medical sense. The same thing is true for people It also happens when I'm relaxing. On the other hand, when a person sits down, the m-joint and hip joint bend. However, for example, in the case of a work chair according to C-629945 , when the backrest pivots backwards, the rear of the seat moves in a normal movement pattern and in a winged manner. When the seat is lowered, the sitting part rotates only about half the distance of the chair backrest. As a result, Physiologically unnatural movements occur, such as the hip joint extending and the J1 joint flexing. Ru.

(for performing backward rotations in work chairs according to: II-A-629945) Then, the user presses their torso against the chair back and firmly presses their legs against the floor. However, it is especially used when a relatively large force must be applied to the rotating stop. There is a danger that the person may slip forward. Also, because the front end of the seat rises, blood congestion in the knee joint area may occur.

A lever is operated to place the chair back in a vertical position. When you operate the , the stressed spring is relaxed during the backward rotation. Next, the backrest and seat are Return to its original position or any intermediate position required by the user. It may slip backwards while turning. The user will now find that their pelvis is in a backward tilted position. However, This results in the user being in an unsatisfactory body position and is more likely to experience back pain.

In the object of C-629945, the backward rotation of the chair back is due to the gas pressure The preload of the compression spring can be adjusted by adjusting the nut. It can be changed by However, in practice, this mechanism does not allow It is not possible to make satisfactory adjustments. Therefore, the preload or preload setting is It is used to approximately match the user's weight. This chair is used by people who are light in weight. It turns out that it is difficult to move the backrest backwards, and that it is difficult to move the backrest backwards. It may slide forward on the top. On the other hand, if a heavy person uses this chair, the When a person moves substantially backwards without feeling any resistance due to his/her weight, the backrest may cause discomfort when adjusting the

Required for rotating the chair back in a work chair according to C11-^-629945 A significant amount of energy is stored in the springs and when the fixation device is released, the chair back It can be used to move the user's torso forward again. The user wears a backrest. when leaving without moving forward, and when the fixing device is released, e.g. by a cleaner. In this case, the chair back moves forward with considerable force and at a considerable speed, causing an injury. poses a serious danger.

υS-＾-4834454 is a seat that has a seat frame or seat support around a pivot at the front of the seat. A chair is disclosed that is rotatable on a holding part. L-shaped backrest frame or backrest support part is a rotary mark that rotates around a pivot provided on the seat frame. The L-shaped backrest frame is The horizontal arm end of the L-shaped backrest frame is connected to the seat by means of a pivot. Back support When the seat rotates backwards, the backrest frame, which is firmly connected to the backrest, lifts the rear of the seat. At the same time, the seat moves slightly backwards. What turns out to be a drawback is that during the beginning of the rotational movement, The pivot at the end of the horizontal arm of the L-shaped backrest frame must make a sudden upward movement. When the chair back begins to rotate backwards, the seat where the user is seated It requires a considerable amount of force to rise. Other disadvantages include heavy use This means that a person who weighs less than a person must use more force than a person who weighs less. Ru. An additional considerable disadvantage is that the distance between the seat and the chair back is such that the chair back This increases when the shirt is rotated, resulting in the unpleasant result of the shirt being prone to being pulled. That's what it means.

It is therefore an object of the invention to overcome at least some of the above-mentioned drawbacks of known work chairs. Therefore, the purpose of the present invention is to eliminate the physiological and natural An object of the present invention is to provide a working chair having a synchronization mechanism that allows movement.

It is also an object of the present invention to provide a more preferable sitting posture through a movement pattern. It is true. It is also an object of the invention that the chair be of simple construction. The chair is The very high aesthetic standards that work chairs, especially office chairs, are now expected to adhere to. It is also necessary to meet the standards.

According to the invention, this is achieved in a chair according to claim 1.

In such a chair, when the backrest frame is rotated in one direction, the seat rotates in the opposite direction. do. Therefore, for example, when the backrest frame rotates backwards, the rear part of the seat will move past the front part of the seat. The person's body rotates upward as a fulcrum, and the person's body rotates around the groin as when a person normally stands up. Perform the natural sequence of movements in which the joints and knee joints extend. Common putters for this move In addition to the pattern, the details of the pattern are very important. For example, claim 1 Due to the large angle of inclination shown in Move backwards. This further stretches the knee joint and prevents hyperemia in the knee joint area. It will be done. Also, due to the large angle of inclination, the chair back can begin to rotate backwards with relatively little force. The user feels comfortable with this movement. Such a satisfying move -7 encourages active seating. Active sitting improves blood circulation through organs and limbs. and contribute to the general health of the chair user. The speed characteristic of passive sitting This prevents eye fatigue. Another important mechanism is the weight distribution provided by force compensation. This is partial compensation, and the force compensation is that the force acting on the chair backrest acts on the seat. This occurs because it is counteracted by the force of the user's weight. Due to this force compensation, the body Weight adjustment for light and heavy users becomes unnecessary.

Another advantage of the invention lies in its very simple construction, which gives the chair a particularly attractive appearance. . Substantially, one lever, that is, one back support frame, is required.

The second pivot of the backrest frame and the plane on which the 1st pivot seat of 'Jl13 is arranged. The angle of inclination (from about 60° to] Oo is desirable, and the 1° test Users (who have been found to feel particularly comfortable in chairs at other angles of inclination) . The movement pattern of the seat and backrest at this angle of inclination makes it easier for the user to (1° The distance between the second pivot and the pivot of the cabinet 3 is 80 m. It is desirable that the range is from 1 to 120, preferably about 100. This is it The condition force for weight compensation (optimized) and the rearward rotation of the chair backrest are Direct movement is performed under optimal conditions.

It is desirable that the backrest is rotatably connected to the backrest frame at the connecting part. Accordingly, the movement of the chair backrest can be performed satisfactorily. Special If the chair backrest is a rocking backrest, the anterior dorsal groove, i.e. the front of the chair user's backrest. Curvature is improved.

Tests have shown that the connection of the chair back rests against the vertical ζ2 through the second pivot. 1 G' is positioned behind the pivot of the grass 2 at an angle of 20°, preferably 15°. power (proved to be favorable).

Move the chair back and seat forward/rice component force f1! The power of being knocked down ( Desired).

Additionally, the spring component shows that the spring force increases with increasing chair back inclination, resulting in a force At f, the weight of the user's torso should be moved relatively quickly to counteract the force applied to the chair back. It is desirable to have a sloped spring characteristic.

It is desirable that the pivot for Straw 3 be placed near the rear half of the seat. This arrangement ζ This provides favorable conditions for body weight regulation.

There are various ways to attach the seat to the front. For example, 1f8 [C2, flexible connection member It can be connected to the front part of the seat frame by means. Advantageous Example 11, Through Support Leno<- Provides multiple connection methods. Support at the front position of the chair backrest, t-11, Conveniently C2 is conjunctivally substantially vertical. Therefore, the front part 11 of the seat, the chair backrest It descends slightly in response to the backward rotation of the Therefore, depending on the user's weight, the ma side will be added by 1 This reduces stress, which promotes much-needed relaxation and blood circulation.

Another viable method is to advance the seat by means of sliding blocks moving within guides. It is to connect to the seat frame at the section.

Conveniently the spring component is an elastic block. The elastic block, known under the name nJ, has movement damping properties and therefore Helps suppress violent forward acceleration. Elastic blocks or coil springs are This is advantageous because it has a spring characteristic with a relatively steep slope, unlike springs. Therefore, the chair Restoring force applied by elastic pro-ac or mechanical spring at the start of rearward movement of child support is small.

Due to the mechanism according to the invention, the zone between the forces acting on the seat and the forces acting on the backrest is There is considerable force compensation in the engine. However, near the end of the back travel of the chair back The force acting on Sagittarius is not at all sufficient to compensate for the force acting on the backrest. ivy.

Therefore, the large restoring force of the elastic block in this zone is very advantageous. It is. The user finds the chair very comfortable and is forced to sit actively.

Designers have a variety of choices for locating spring components. For example, Noine configuration The element can act directly on the chair back. However, very convenient In this case, the spring component is arranged substantially parallel to the seat and acts on the seat. be. This structure allows the mechanism below the seat to be very simple, i.e. aesthetically A desirable mechanism is obtained.

The seat and backrest can be manufactured from a single flexible elastic product, such as a plastic product. Wear.

Another viable method is to combine the seat curved plate and the backrest curved plate into a single member with an articulated section. , for example, from a plastic member.

This type of structure consists of a second pivot of the backrest frame and a third pivot connecting the backrest frame to the seat. This is possible due to the arrangement according to Bots' invention. This arrangement makes it possible to use An undesirable area between the seat and backrest that may cause the person's shirt to become stretched. This is because movement is prevented.

For tightening, a means is provided, for example, for disk tightening, a means is provided to hold the seat and chair back in place. It is desirable to fix it. In the structure of the working chair according to the invention, the seat is connected to the back of the chair. The fixing device acting on the seat has a relatively long travel distance depending on the movement of the rest. Only relatively low forces have to be dealt with, and therefore the tightening means can be replaced by conventional gas Can be used in place of springs. This type of tightening is a means of low manufacturing liability (and This eliminates the problem of waste disposal.

It is desirable that the seat is well recessed. In other words, there is pain in the seat that corresponds to the contours of the human body. A lump is formed. This depression allows the seat to slide even when the seat is in a relatively steep position. There is less risk of damage.

The second bidet 1, the bidet 3) and the connecting part are in the normal position when the seat is tilted. The angle is approximately 3 degrees to the rear, and the pivot and connecting part of the backrest 3 are arranged. and approximately 34° behind the backrest frame. It is desirable that the seat be arranged so that it rotates upward by approximately 5 degrees in response to the direction rotation. stomach.

This construction has proven to be very convenient from an ergonomic point of view.

Embodiments of the present invention will be described below with reference to the drawings.

The commode 1 figure shows an embodiment of the commode 1 of the work chair in the normal seating position.

East 21! l shows the chair of system 1 in the tilted position with the chair back moved backwards. .

FIG. 3 shows a second embodiment of the work chair in the normal seating position.

Figure 13a shows a modification of the chair back frame.

FIG. 4 shows the chair of FIG. 3 in a tilted position.

'1g5Iiiiil shows the east 3 embodiment of the work chair in the normal seating position .

Fig. 6 shows the chair of Fig. 5 in a tilted position.

In the embodiment shown in Figure JFII and Figure 2, the seat frame 11 has an upright portion 13 and a vertical field 1l. It is supported in a conventional manner by a cruciform base consisting of IN. Only erect @H is shown be done. Advantageously, the seat IS is significantly recessed, i.e. it prevents the seated person from sliding forward. A recess 16 is formed at the rear to suppress this. The cover 18 is installed in a conventional manner. can be used.

The chair back 29 can have a cover 18. At the front end the seat 15 is It is supported by the frame 1 by means of a support lever 17. The support lever 17 is a connecting portion It is connected to the frame 11 at 19 and to the seat 15 at the connecting portion 2j. However, constellation 15 may be supported on the frame 11, for example by means of a flexure-elastic connecting component. Chair has a backrest frame 25 rotatably connected to the seat frame 11 via the bidet 23. do. The backrest frame 25 is a lever with two arms. Arm 27 of the system l is connected to a back rest 29 which is a rocking back rest. Second arm 31 of lever 25 is coupled to the locus IS. The arm 27 is connected to the backrest 29 by, for example, a connecting portion 33. It is joined to the center or bottom. The second arm 31 is attached to the seat 15 with a pivot It is connected to the rear half of the part. The distance between pivots 21 and 35 is about the seat length. There is a distance of about half or more, for example, two-thirds of the sitting length.

The position of pivot 35 relative to pivot 33 is particularly important. Bidet 1 35 is It is arranged at the front upper part of the pivot 23. An important consideration is the normal sitting position in the position, i.e. with the chair back 2g substantially upright, the two pivots The angle of inclination of the plane containing 23.35 is approximately 45 to 800, preferably 80 to 7 This means that the angle is 0'. When the chair backrest 29 rotates backwards, the bidet 1 to 35 moves in the direction indicated by arrow 4s. Moves with relatively little force. seat 15 also moves a relatively large distance backwards. The distance between bidets 23 and 35 is approximately 80 to 120 ml, preferably about 100 ml.

These dimensions enhance weight compensation.

A finger 37 is formed on the lever 25 via which the spring component 3 is attached to the lever. Force from 9 acts. Spring component 39 moves chair back 29 forward i.e. to restore it to its normal seating position. Preferably The spring component 3g is a coil spring, e.g. It is a compression spring.

However, elastic blocks, e.g. It is highly desirable to use a spring element 39 as spring component 39.

A locking device 42 with an operating lever 44 is shown diagrammatically in FIG. Fixing device 42 can take the form of a simple clamp *t, for example a plate fastener. mentioned earlier So weight compensation is done, and the seat has a relatively long travel distance, so it is fixed? child The required force is relatively small, so a single tightening is sufficient for the device.

As you can see by comparing the position of the chair in Figure 1 and *211Q, the chair backrest 29 The force acting in the direction of arrow 43 is applied backwards and upwards in the direction shown by arrow 45. Move the seat 15, and then move the IS around the pivot 21 in the direction indicated by the arrow 4f. As it rotates, the front end of the seat lowers. The torques acting on arms 27 and 31 are Therefore, regardless of whether the user of the chair is light or heavy, the weight shown in Figure 1 is 21st from the position! Only a relatively small amount of energy is used to change the position to l. good.

Figures 3 and 4 show that the chair back closely follows the contours of the torso and the shirt is stretched. It clearly shows that there is no risk of

In summary, the advantages that the a structure described above provides to the user are considerable. In other words, self A comfortable movement pattern with natural movement, and the force is compensated between the seat and chair back, so your body Ergonomic seating and seat movement for both light and heavy users. This reduces hyperemia in the posterior area of the knee and reduces the possibility of the knee being pulled. It has the advantage of having a particularly satisfying dorsal front shoulder.

The embodiment shown in FIGS. 3 and 4 is mainly for the case where the seat 15 is supported by the seat frame 11. This embodiment differs from the embodiment described above in terms of the method and arrangement of the spring 39. In the seat frame 11, An inclined guide 20, for example a sloft, on which a sliding block can slide is formed.

The sliding block may be, for example, a mouth 1 door 22 supported by a prong 24 of the seat 15. I can do it. Spring component 39, for example an elastic block (rZellvulkol anJ) is arranged substantially parallel to the seat 15 and supported by the seat frame 11 at one end 26. and acts on seat 15 at the other end. The spring component 39 has the loft 22 and the lug 24 The force is transmitted to the seat 15 via the seat 15, and the seat 15 is moved forward toward the position shown in FIG. It is useful for

The back support frame 25 can have various shapes. 11g3am has L thoughts. This shows the possible deformations. Pivots z3.35 and 33 can be connected in different ways Designers can choose this method to make the chair an attractive structure. It can be designed to

For example, the back supports 25 are provided on both sides, and the two back supports are connected to the pivot 2. 3, they can be connected to each other. The long leg portion 46 can be used as an armrest. (Stalk 38).

This differs primarily from the embodiments of Kaya 3 and Kan 4 in that they are rotatably interconnected.

Therefore, the seat plate and the curved back plate are made of a single elastic member, such as a plastic part. It can be constructed from wood or from a single piece having an articulated portion 28.

Continuation of front page (81) Specified times EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IT, LU, MC, NL, SE), 0A (BF , BJ, CF, CG, CI, CM, GA, GN, ML, MR, SN, TD, TG. ), AT, AU, BB, BG, BR, CA, CH, C3, DE.

DK, ES, FI, GB, HU, JP, KP, KR, LK, LU, MG, MN, MW, NL, No, PL, RO, RU, SD, SE, US

Claims (1)

[Claims] 1. Freely pivotable forward around the seat frame (11) and the first pivot (21) on the seat frame. a seat (15) which is large and movable substantially horizontally with respect to the seat frame (11); and a second pin. It is connected to the seat frame (11) by a bot (23) and connected to the seat (1) by a third pivot (35). The back rest frame (25) is connected to the back rest frame (25), and the back rest frame (25) is connected to the back rest frame (25). 29) A work chair, especially an office chair, comprising: The pivot (35) is placed in front of and higher than the second pivot (23). attached, and further a third pivot (35) and a second pivot (23) are arranged. The angle of inclination of the plane is approximately 45° to 80° when the work chair is in its normal position. A work chair characterized by: 2. As claimed in claim 1, wherein the angle of inclination is approximately 60° to 70°. The work chair described in paragraph 1. 3. The distance between the second pivot (23) and the third pivot (35) is approximately 80m 120 mm, preferably 100 mm from m A work chair as described in item 1 or 2 of the following. 4. The back rest (29) is rotatably connected to the back rest frame (25) at the connecting part (33). Any one of claims 1 to 3, characterized in that The work chair described. 5. The connecting part (33) of the chair back (29) has a vertical connection passing through the second pivot (23). The second pivot (2 3) of the claims 1 to 4, or A work chair mentioned in any of the above. 6. A spring component (39) is provided for moving the backrest (29) forward. The work described in any one of claims 1 to 5 characterized by chair. 7. The third pivot (35) is located near the rear half of the seat (15) A working chair according to any one of claims 1 to 6. . 8. The first aspect of claim 1, wherein the backrest (29) is a swinging backrest. A work chair described in any of paragraphs 7 through 7. 9. The seat (15) is connected at its front portion to the seat frame (11) by a flexible connecting member. Claims recited in any one of claims 1 to 8, characterized in that work chair. 10. The front part of the seat (15) is connected to the seat frame (11) by a support lever (17). Any one of claims 1 to 8, characterized in that: work chair. 11. In the normal position of the backrest (29), the support lever (17) is substantially vertical. The working chair according to claim 10, characterized in that it is directly arranged. Child. 12. The seat (15) is a means for the sliding block (22) to move within the guide (20). Claims characterized in that its front part is connected to the seat frame (11) by The work chair described in any of Items 1 to 10. 13. Claims characterized in that the spring component (39) is an elastic block. A work chair according to any of items 6 to 12 of the scope. 14. Claims characterized in that the spring component (39) is a coil spring. A work chair described in any of Items 6 to 13 of the above. 15. The spring component (39) is characterized in that it acts on the backrest frame (25). A working chair according to claim 10. 15. The spring component (39) is arranged substantially parallel to the seat (15) and The working chair according to claim 10, characterized in that it acts on the following: . 17. The seat (15) and the backrest (29) are made of a single flexible elastic material, e.g. plastic. Items 1 to 16 of the claims, characterized in that the item consists of a processed product A work chair described in any of the above. 18. The seat (15) and the backrest (29) are a single workpiece with an articulated part (28); For example, the first claim characterized in that the product is made of a plastic processed product. 16. 19. A tightening means, for example a plate tightening means, holds the seat (15) and the backrest frame (25) in place. Claim 1, characterized in that it is provided for fixing in a fixed position. 18. 20. Claims 1 to 1, characterized in that the seat (15) is recessed. A work chair described in any of items up to 19. 21. Second pivot (23), third pivot (35) and connection part (33) In the normal position, the inclination angle of the seat (15) is approximately 3° to the rear, and Approximately with respect to the plane in which the third pivot (35) of the backrest (29) and the connecting part are located. In order to include an angle of 103°, and according to the rotation of the backrest frame (25) of about 34°. , the seat is arranged so as to be pivoted upward by about 5 degrees. A work chair according to any one of items 4 to 20 of the scope.