JPH0998849A - Tilting device for chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair free from giving a sense of unease to a sitting person, and capable of ensuring a stable feeling by eliminating the loss of good appearance as the chair through the reduction of a change in a gap between the lower part of a seat back and the rear part of a seat, regardless of the tilting motion of the seat back and seat, and lessening the motion of a sitting person under an armrest as well as the deviation of a contact position between the sitting person's back and the seat back. SOLUTION: The first and the second engagement shafts 22 and 23 of an armrest are independently coupled to and engaged with the first and the second cam holes 33 and 34 of a seat back. Also, the third engagement shaft 12 of a seat B journalled to a seat lower frame in such a state as capable of freely oscillating is coupled to and engaged with the third cam hole 35 of the seat back. Furthermore, an expansion and contraction energization means adjustable for the extent of expansion and contraction, with one end connected to the stationary part of a chair in such a state as capable of oscillating, has the other end jointed to the lower part of the seat back in such a state as capable of freely oscillating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is constructed so that a seating board performs a tilting motion in the vertical direction with its front end as a fulcrum in conjunction with a tilting motion of a backrest in a chair in the longitudinal direction and a vertical motion. The present invention relates to the improvement of the tilting device for the chair.

[0002]

2. Description of the Related Art As is well known, in a chair constructed such that a seat is tilted in response to a back-and-forth tilting motion and a vertical motion of a backrest, the seat is not limited to a tilting motion. At the same time as the tilting motion, it is customary to configure the tilting device of the chair so as to move in the anteroposterior direction in order to reduce the force applied to the lumbar region.

[0003]

In the case of a chair provided with such a tilting device, the backrest and the seat are close to each other during the tilting motion, in other words, the centerline of the backrest and the centerline of the seat. The position of the intersection point of each changes greatly on each center line, the gap between the backrest and the seat becomes large, and the aesthetics as a chair is spoiled. Since the contact position between the seated person's back and the back is largely displaced, there is an unexpected problem that the seated person feels a sense of incongruity and lacks stability, and feels anxiety.

The present invention has been made in view of the above-mentioned circumstances, and the seat base is interlocked for the tilting movement of the backrest in the front-rear direction and the up-and-down movement, and the front end portion thereof serves as a fulcrum in the up-down direction. Even when tilted, the change in the gap between the backrest and the seat is reduced, and it does not impair the aesthetics of a chair. An object of the present invention is to provide a chair tilting device capable of maintaining a stable feeling without causing a seated person to feel uncomfortable due to a discomfort of a contact position.

[0005]

In order to achieve the above-mentioned object, the tilting device for a chair according to the present invention is arranged inwardly with a space above and below the rear inside of the armrest of the chair. The upper first engaging shaft of the separate engaging shafts is formed at a lower upper position of the backrest, and has a first cam hole mainly for holding the tilting position of the backrest and a second lower shaft. The engaging shaft is formed at a lower position of the lower portion of the backrest, and is formed in the second cam hole mainly for vertical movement operation of the backrest, and the rear end side is moved up and down on the front side of the seat lower frame. A third engaging shaft horizontally arranged at a rear end portion of a seat plate pivotally supported in a tilting direction is formed in front of the second cam hole formed at a lower lower position of the backrest. The third cam holes provided are engaged with each other, and further, in the lower part of the backrest, The other end of the telescopic urging means whose end is oscillatably connected to the fixed portion of the chair and which can be telescopically adjusted is oscillatably connected, and the backrest and the seat are tilted by the operation of the telescopic urging means. It is characterized by tightening.

[0006]

The chair tilting device according to the present invention has the above-described structure. When the expansion / contraction urging means is extended, the lower portion of the backrest is pushed rearward, and the first and second engaging shafts of the armrest are backrested. The lower part of the backrest is pushed rearward so as to be positioned below the first and second cam holes of the backrest, and the backrest is pushed up to reduce the degree of tilting of the backrest, and at the same time, the third engaging shaft of the seat is provided with the backrest. At the front position of the third cam hole, the rear end side of the seat is pushed up, and the degree of tilting of the seat is reduced.

On the contrary, when the expansion / contraction urging means is contracted, the lower part of the backrest is pulled forward, and the first and second engaging shafts of the armrest are positioned above the first and second cam holes of the backrest. As described above, the lower part of the backrest is pulled forward and the backrest is pulled down to increase the degree of tilting, and at the same time, the third engagement shaft of the seat is located behind the third cam hole of the backrest, and The rear end side is pulled down, and the degree of tilting of the seat is increased.

In any of the above cases, the backrest and the rear end portion of the seat base have the same moving directions,
Since the position of the intersection of the centerline of the backrest and the centerline of the seat changes little on each centerline, the gap between the backrest and the seat hardly changes, and the height of the seat does not change. At the same time, the displacement of the contact position between the seated person's back and the backrest is reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described in detail below with reference to the drawings in which the main parts of the structure are mainly shown, and the parts other than the main parts are omitted as much as possible.

In the drawing, X indicates a chair, and this chair X
In A, A is a seat lower frame, B is a seater disposed on the seat lower frame A, C is armrests C and C (on one side not shown) disposed on the left and right sides of the seat lower frame A and the seater B, respectively. D is a backrest arranged at the rear of the seat B, and E is used for tilting movement of the seat B in the vertical direction and tilting movement of the backrest D in the front-rear direction and vertical movement, which will be apparent from later. It is a gas spring as a stretchable urging means capable of stretchable adjustment.

In order to configure the tilting device of the chair according to the present invention, in the seat B, the front end portion of the seat frame 11 is connected to the top of the front seat lower frame 1 of the seat lower frame A via the hinge 2. With this as a fulcrum, a tilting operation is possible in the vertical direction, and on both sides of the rear end portion of the seat frame 11, third engaging shafts 12, 12 for tilting operation, which will be apparent from later, are concentric. It is installed horizontally.

Further, the armrests C, the elbow frames 21, 2 for forming C.
The first engaging shafts 22, 22 (one not shown) with the backrest D are provided at positions higher than the surface of the seat base B on the inner side surface facing each other (one is not shown). The second engaging shafts 23, 23 (one of which is not shown) are separately provided concentrically and horizontally through the reinforcing plates 24, 24 (one of which is not shown). In addition, 25 is an elbow frame 21,
It is a leg that is screwed in and fixed to the front and rear of 21.

Further, the back columns 31, 31 for forming the backrest D
Reinforcing plates 32 and 32 are integrally attached to the back posts 31 and 31 at the lower end of the back posts 31 and 31 and the reinforcing plates 32 and 32, respectively.
Through which the first engaging shafts 22, 22 are fitted and engaged, and the vertical arc-shaped first cam holes 33, 33 mainly used for holding the tilt position of the backrest D in the front-rear direction are provided. The first cam hole 3 is provided below the first cam hole 33, 33.
The degree of forward tilt is shallower than 3, 33, and the second engaging shaft 2
Vertically arcuate second cam holes 34, 34, which are used for up and down movement of the backrest D, are provided, respectively. A third cam shaft 12 having an upward arc shape, into which the third engaging shafts 12, 12 provided on both sides of the rear end of the seat frame 11 are fitted and engaged, and which is used for the tilting motion of the seat B in the vertical direction. 35,3
5 is provided on the reinforcing plates 32 and 32 projecting forward from the lower ends of the back posts 31 and 31 in the seat B direction.

Further, one end of the ridge 36 between the lower ends of the back columns 31, 31 is swingably connected to a mounting seat 3 provided inside the lower part of the front seat lower frame 1 of the seat lower frame A. A mounting seat 37 is provided for connecting the tip end of a piston rod 42, which is capable of adjusting the amount of gas spring E to be taken in and out of the cylinder 41, to be swingable.

[0015]

As is apparent from the above description, according to the present invention, the change in the gap formed between the backrest and the seat is made small, and the aesthetics of a chair is not impaired, and at the same time the seated person is seated. The tilting of the chair that does not move below the knees of the seat, and that the position of contact between the seated person's back and back is small, and that the seated person does not feel anxiety due to the feeling of discomfort, and can maintain a stable feeling. The equipment can now be provided.

[Brief description of drawings]

FIG. 1 is an explanatory view of a main part configuration in which one elbow frame of a chair in which a tilting device for a chair according to the present invention is incorporated is removed, a part is vertically cut to explain a main part configuration, and the chair is viewed from a side surface. It is a diagram.

FIG. 2 is a development view in which a gas spring as an expansion / contraction urging means capable of expansion / contraction adjustment for the tilting device configuration shown in FIG. 1 is omitted.

FIG. 3 is an enlarged view of a connecting portion for interlocking a backrest and a seat in the chair for the tilting device configuration shown in FIG.

[Explanation of symbols]

 X Chair A Seat lower frame 1 Front seat lower frame 2 Hinge 3 Mounting seat B Seat base 11 Seat frame 12 Third engaging shaft C Armrest 21 Elbow frame 22 First engaging shaft 23 Second engaging shaft 24 Reinforcing plate 25 Leg D Backrest 31 Dorsal column 32 Reinforcement plate 33 First cam hole 34 Second cam hole 35 Third cam hole 36 Bed 37 Mounting seat E Gas spring 41 Cylinder 42 Piston rod

Claims (1)

[Claims] 1. An upper first engaging shaft of the respective engaging shafts arranged inwardly at intervals above and below the rear part of the armrest of the chair, the upper first engaging shaft is located at a lower upper position of the backrest. And a lower second engaging shaft is formed at a lower lower position of the backrest, and a first cam hole mainly for holding the tilting position of the backrest is formed at a lower position of the backrest, and the vertical movement of the backrest is performed. It is installed horizontally in the second cam hole mainly for use, and in the rear end of the seat that is pivotally supported so that the rear end of the seat lower frame moves up and down and tilts in the vertical direction. The third engaging shafts are respectively engaged with third cam holes formed in front of the second cam holes formed at a lower position of the lower portion of the backrest, and one end of the third shaft is provided at a lower portion of the backrest. A telescopic urging means that allows the telescopic adjustment to be swingably connected to a fixed part of a chair A tilting device for a chair, characterized in that the other end of the chair is swingably connected, and the backrest and the seat are tilted by the operation of the expansion and contraction biasing means.