JPH0675246U - Chair tilting structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a tilting structure of a chair that suppresses upward movement of the seat front when tilting and can take a sufficiently relaxed posture when tilting. [Structure] Fixed frame body 5 attached to the upper ends of leg columns 2
In the chair provided with the seat frame 22 which is elastically deformable so as to be able to tilt rearward through the biasing means 10 on the upper part of the fixed frame body 5, the fixed frame body 5 has a slide piece 19 extending to the front part. In addition, the engaging portion 24 is provided on the lower surface of the front portion 22a of the seat frame 22 so as to be slidable with the slide piece 19, and the upward movement of the front portion of the seat frame 22b is restricted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chair tilting device, and more particularly to a chair tilting structure that can obtain a relaxed posture when tilting backward without changing the height in front of the seat.

[0002]

[Prior art]

 Conventionally, in a chair tilting device, a spring is attached using a center of the lower part of the seat or slightly in front of the seat as a fulcrum, and when a load is applied to the back of the seat, the seat and the backrest tilt backward. When the spring extends, it acts elastically in an attempt to restore the seat or the like in the direction opposite to the backward leaning direction and maintains the backward leaning posture of the seated person.

[0003]

[Problems to be solved by the device]

 However, since the entire seat tilts backward, the front part of the seat may press the back side of the thigh of the seated person, and the legs may rise, resulting in an unstable posture. Such an unstable posture and pressure on a part of the body greatly affect the feeling of relaxation. Therefore, it is desirable that only the rear part of the seat and the back part tilt backward in order to obtain a stable backward tilting posture and not to press the thigh.

Therefore, it is an object of the present invention to provide a tilting structure of a chair that suppresses the upward movement of the seat front part when tilting and can take a sufficiently relaxed posture when tilting. .

[0005]

[Means for Solving the Problems]

 Therefore, according to the present invention, in the chair provided with the fixed frame body attached to the upper ends of the leg columns and the elastically deformable seat frame which can be tilted rearward through the biasing means at the upper portion of the fixed frame body, The fixed frame body is provided with a slide piece extending to the front part, and an engaging portion is provided on the lower surface of the front part of the seat frame so as to be slidable with the slide piece. The mechanism is the tilting structure of the chair configured to regulate the.

[0006]

[Action]

 With the above configuration, the front portion of the seat frame can slide with respect to the slide piece, so that even if the front portion of the seat frame tries to move up due to the rearward tilt of the seat frame, The front part of the seat does not move upward because the seat frame is elastically bent while being restricted to slide.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 shows a cross-sectional view in the front-rear direction of a seat portion of a chair 1 according to the present invention. In the chair 1, a tilting device 4, a tilting frame 14, and a seat body 26 including a seat frame 22 and a cushion body 25 are attached to the upper end side of a leg support 2 having casters (not shown) at the lower end.

The tilting device 4 is housed in a recess 5 a of a fixed frame body 5 formed in an upwardly opening U-shaped cross section at the upper end of the leg support 2. The fixed frame body 5 is formed so as to project from the leg support 2 to the front side of the seat body 26. The tilting device 4 is composed of two mounting pins 6a and 6b, two springs 7a and 7b, a connecting piece 9 and the like. The two mounting pins 6a and 6b are bridged in parallel with the front side of the seat and the rear side of the seat in the recess 5a of the fixed frame body 5. The rear pin 6b is fixed to the frame 5 slightly rearward of the leg support 2, and the front pin 6a is rotatably supported forward from the leg support 2 by a predetermined distance. Mounted parallel to.

Further, as shown in FIG. 2, two springs 7a and 7b are arranged side by side so as to sandwich the leg support 2 at predetermined positions of the two pins 6a and 6b, respectively. There is. The springs 7a and 7b are selected to have a predetermined length and a predetermined elasticity suitable for tilting the chair. A hook piece 8 having holes to be attached to the front and rear pins 6a, 6b is attached to both ends of each spring 7a, 7b, and is attached in an initial state in which the spring piece 7a, 7b is hardly stretched through the hook piece 8. .

Two plate-shaped connecting pieces 9 are fixed to the left and right ends of the front pin 6a by welding or the like. Behind the seat above the connecting piece 9, there is a portion that comes into contact with an auxiliary shaft that is mounted above the inside of the recess parallel to the rear side of the front pin 6a. Further, the upper end of the connecting piece 9 is fixed to the lower surface of the tilting plate 10 located above the front pin 6a by welding or the like.

The tilting plate 10 is formed in an elongated plate shape wider than the width of the fixed frame body 5 and substantially corresponding to the width of the seat, and is horizontally positioned substantially above the front pin 6a. . A tilting plate support member 11 made of plastic and having a cylindrical shape is attached to the center of the tilting plate 10 at an interval corresponding to the width of the fixed frame body 5 so as to fit the tilting plate 10 in the center thereof. ing. Then, the two support members 11 are fitted in predetermined portions on the left and right sides of the fixed frame body 5 into the support member recesses 12 which are partially formed in a semicircular shape, and the upper half of the support member 11 is protruded in a strip shape. It is rotatably fixed by a pressing piece 13 shaped to follow the part. That is, the tilting plate 10 is bridged over the left and right sides of the fixed frame body 5 and is formed so as to be tiltable at that position. Further, when the tilting plate 10 is tilted backward, it is restored by the springs 6a and 6b via the front pin 6a. It has become a biased biasing means. The tilting plate 10 thus formed constitutes a part of the tilting frame 14.

The tilting frame 14 is for supporting the buttocks of the seated person, and also the lower side of the waist and back. . The tilting frame 14 is substantially L-shaped in a side view, and is composed of a frame body 16 that follows the outer shape of the tilting frame 14 and a reinforcing plate 17 for supporting a load particularly near the buttocks. The frame 16a at the front end of the tilting frame 14 constitutes the tilting plate 10 joined to the upper end of the connecting piece 9 described above, and thus serves as the center of rotation of the tilting frame 14.

On the other hand, in front of the tilting plate 10, a slide piece 19 is integrally fixed to the fixed frame body 5 by welding. The slide piece 19 has a substantially plate-like shape and is formed by extending from the fixed frame body 5 so as to support the back side of the seat occupant's substantial portion, and a fin portion 20 protruding left and right is formed. In this way, the tilting frame 14 is formed so as to be tilted rearward via the connecting piece 9, and the slide piece 19 is integrally fixed to the fixed frame body 5 and does not interlock with the expansion and contraction of the springs 7a and 7b of the tilting device 4. It is composed.

Further, a seat frame 22 to which a cushion body 25 and an outer skin is attached is attached to the tilting frame 14. The seat frame 22 is formed of a material having elasticity such as plastic into a shape substantially corresponding to the shape of the entire seat. The seat frame rear portion 22a corresponding to the back, waist and buttocks of the seat frame 22 is integrally attached to the rear frame 15 by screws or the like, and when the rear frame 15 is tilted, the seat frame rear portion 22a is tilted integrally with the rear frame 15. Has become. On the other hand, on the back surface of the seat frame front portion 22b corresponding to the back side of the lower part of the thigh of the seated person, two slide rails 24 having a substantially U-shaped cross section as shown in FIG. 4 (a) are provided in front of the seat frame. The portions 22b are formed on the right and left sides with a constant interval. The slide rails 24 are arranged such that their openings are opposed to each other, and the groove portions 24a are attached to the slide piece 19 so as to sandwich the fin portion 20 of the slide piece 19 therebetween. Therefore, the seat frame front portion 22b is not completely integrated with the slide piece 19, but is integrated so as to be slidable forward and backward with respect to the slide piece 19 via the slide rail 24. A wall is formed on the front end side of each slide rail 24 to prevent the fin portion 20 from coming off.

Next, a description will be given of the function and effect in the rearward tilting of the chair, which is obtained by configuring the tilting structure of the chair as described above. As shown in FIG. 4 (b), when the seated person moves his / her weight backward and tries to take a backward tilted posture, the load causes the frame body front portion 16 a ( The seat frame 22 integrated with the frame 14 tilts backwards in conjunction with the tilting plate 10) tilting backward while repelling the restoring force of the springs 7a and 7b. At this time, the seat frame front portion 22b integrated with the slide piece 19 receives a force that tends to move upward as the seat frame rear portion 22a tilts backward. However, the front portion 22b is slidably attached not to the tilting frame 14 that tilts backward but to the slide piece 19 that is fixed to the fixed frame body 5 and does not tilt. Therefore, the force of upward movement acts to slide the seat frame front portion 22b rearward via the slide rail 24. That is, since the elastic seat frame 22 is formed near the tilting plate 10, only the rear portion 22a of the seat frame 22 is tilted rearward, and the front portion 22b is positioned rearward with respect to the slide piece 19. It never moves up.

As described above, the force for moving the seat frame front portion 22b upward in an attempt to tilt backward together with the tilt frame 14 is generated by the elasticity of the seat frame 22 and the slide rails provided on the seat frame front portion 22b. By 24, the seat frame front portion 22b can be slid rearward to be received, and the upward movement of the seat front portion can be suppressed. As a result, in the tilted state, the back side of the thigh of the seated person is not pressed by the front part of the seat, so that the posture is stable when tilted, and a truly relaxed state can be obtained.

Further, with the simple structure as described above, it is possible to obtain a rearwardly tilted posture in which the upward movement of the front part is suppressed, so that the assembling work is not complicated, and the number of parts can be suppressed, which is low. The tilt structure has good cost and good quality.

Instead of the springs 7a and 7b used in the tilting device 4, an elastically extensible urging member or an extensible and adjustable urging member such as a gas spring may be used. . The slide rail provided on the back side of the seat frame front portion 22b may be slidably engaged with the fin portion 20 of the front frame 19, and may have a simple groove shape or a part of the back surface of the seat frame 22. It may be possible to project and fit the fin portion 20.

[0019]

[Effect of device]

 As described above, according to the present invention, the tilting frame that can be tilted backward and the fixed slide piece are connected to the biasing means at the front end of the tilting frame so that they can be tilted backward, and the front portion of the seat frame is By slidably engaging the slide piece that does not tilt backward, the front portion of the seat frame, which is going to move up in conjunction with the rear frame, can be elastically bent and slid backward. For this reason, the front part of the seat frame is maintained at the height of the slide piece, and only the rear part of the seat frame is tilted rearward, so that a relaxed posture can be taken when tilting backward.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a tilting device around a tilting plate of a chair, a frame, and a seat frame.

FIG. 2 is a diagram showing a top view of FIG.

3 is a diagram showing a front view of FIG. 1. FIG.

FIG. 4 is a view in which a cross-sectional view showing a relationship between a seat frame front portion and a fin portion of a slide piece and a view showing an action at the time of tilting are combined.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Chair 2 ... Leg support 5 ... Fixed frame body 10 ... Biasing means (tilting plate) 19 ... Slide piece 22 ... Seat frame 24 ... Engagement part

Claims (1)

[Scope of utility model registration request] 1. A chair provided with a fixed frame body attached to the upper ends of leg columns and a seat frame which is elastically deformable so as to be able to tilt rearward through an urging means on the upper side of the fixed frame body, wherein the fixed frame body is provided. A slide piece extending to the front part is provided on the body, and an engaging portion is provided on the lower surface of the front part of the seat frame so as to be slidable with the slide piece, and the upward movement of the seat frame front part is restricted. The tilting structure of the chair.