JPH0357164Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a tilting device configured to enable the seat and backrest of a chair to tilt backward in conjunction with each other. This invention relates to a structure that allows the backward tilting angle of the backrest to be larger than the angle.

[Conventional technology]

As one of the prior art techniques of a chair in which the seat plate and backrest are linked and tilted backwards, for example, Japanese Patent Application Laid-Open No. 10012/1983 discloses a structure in which the seat support body and the front and rear midway portions of the seat plate are linked. At the same time, the upper and lower middle parts of a frame that also serves as a pair of left and right armrest support members to which the backrest is attached are pivotally connected to the front and rear middle parts of the left and right sides of the seat plate, and the lower end of the frame is attached to the seat plate. A so-called four-bar linkage mechanism has been disclosed in which a pin is pivotally attached to the side of the support body.

[Problem that the invention attempts to solve]

According to this configuration, the frame to which the backrest is attached in the four-bar linkage mechanism, the connecting link between the seat plate at the rear position and the supporting body form a V-shape when viewed from the side of the chair, and the seat plate is connected to the rear of the frame. In order to tilt the link, the location where the link is attached to the seat plate at the rear of the frame should be located near the rear of the seat plate.

Therefore, although the center of rotation of this four-bar linkage mechanism is located halfway between the front frame and the rear link in the front-rear direction, as the seat plate tilts rearward and downward, the rear end of the seat plate The lifting dimension of the front end is larger than the descending dimension of the seat, which lifts the legs of the person sitting on the seat board off the floor, strongly compressing the lower side of the thigh near the knee.

Moreover, since the rear link must be rotatably connected to the support body and the seat plate at separate upper and lower locations, it is necessary to provide a large vertical distance between the support body and the seat plate, which increases the bulk. At the same time, the structure of these connecting parts becomes even more complicated, and the appearance of the chair from the side becomes poor.

Furthermore, as a prior art technique for making the rear tilting angle of the backrest member larger than the rearward tilting angle of the seat plate, Japanese Utility Model Application Publication No. 13047/1987 discloses that the front part of the seat plate is is rotatably supported on a horizontal axis, and the front and rear longitudinal grooves at the front end of the lower horizontal part of the backrest member, which is L-shaped in side view, are fitted into pins protruding laterally from both the left and right sides of the support body so as to be movable back and forth. and connect the front and rear midway portions of the lower end horizontal portion and the rear end of the seat plate via a joint shaft so as to be able to bend vertically;
It is proposed that a gas-filled shock absorber such as a gas cylinder be rotatably mounted between the joint shaft and the support body. With this configuration, although the front part of the seat plate mentioned above cannot be lifted up significantly, it requires measures such as separately protruding the armrests of the chair forward from the backrest member, which increases the number of parts and complicates the structure. There was also the problem of high costs.

An object of the present invention is to provide a chair tilting device which is constructed so that the backward tilting angle of the backrest is larger than the backward tilting angle of the seat plate, and which has a simple structure and can reduce costs. The purpose is to

[Means for solving problems]

In order to achieve the above object, in the present invention, the front part of the seat plate is rotatably supported on the front part of the support body of the chair about a horizontal axis, and an elastic support body is installed between the support body and the seat plate. The seat plate is configured to be able to tilt backwards against the force means, and a pair of left and right support rods to which the backrest is attached at the rear are formed into a horizontally L-shape when viewed from the side, and the horizontal portions of both support rods are arranged as armrest members. The upper and lower middle parts of the vertical parts of the left and right support rods are pivoted to the front and rear middle parts of the left and right sides of the seat plate, and the lower ends of the left and right support rods are connected to the left and right sides of the support body. The backrest is mounted so as to be slidable up and down along an inclined vertical long slot formed in the middle of the front and rear parts of the backrest.
The seat plate is configured to tilt more than the tilt angle of the seat plate in accordance with the backward tilting movement of the seat plate.

[Action and effect]

According to the present invention, the backward tilting angle of the backrest is made larger than the backward tilting angle of the seat plate, so that the person sitting on the chair can tilt the upper body of the chair more backwards to take a comfortable posture, and when sitting on the chair, it is possible to take a comfortable posture. Since there is no need to move the person's buttocks toward the front of the seat board to sit back down, there is no problem with the hem of the shirt rising.

and a pivot point between the front part of the support body and the front part of the seat plate, and a pin pivot point with respect to the seat plate of the vertical part of the pair of left and right support rods that also serve as support for the backrest part and the armrest;
This is a so-called three-bar linkage mechanism, in which the mounting portion is slidable in the inclined upper and lower elongated slots of the supporting body at the lower vertical end, and the structure is extremely simple and the appearance of the chair when viewed from the side is simple, which is excellent.

Furthermore, by forming the support rod into a substantially L-shape when viewed from the side, it serves as a member that supports both the backrest and armrest members, reducing the number of parts, and simplifying the structure and reducing costs. It can also contribute to the reduction of

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings. A pair of left and right supports on both left and right sides of the seat plate 7 include a seat plate 7 rotatably attached to the support body 5 via a horizontal shaft 6, and a backrest 8 disposed on the rear upper surface of the seat plate 7. L-shaped support rod 9,
It consists of 9.

The seat plate 7 is made up of a seat support 14 and a cushion 16 with a plate 15 attached to the upper surface thereof. This elastic support means 10 is inserted by inserting an elastic support means 10 such as a cylinder.
The seat plate 7 is configured to tilt backward as the center of gravity of the person sitting on the seat plate 7 moves backward against the spring force of the seat plate 7.

The pair of left and right support rods 9, 9 are made of a frame formed by bending a tube into a horizontal L-shape when viewed from the side, and an armrest member 11 is screwed to the upper surface of the horizontal portion at each upper end thereof, while an armrest member 11 is screwed to the upper surface of the horizontal portion at the upper end thereof. By fixing the backrest 8 to the ends, the pair of left and right support rods 9, 9 serve both of the functions of supporting members for the armrest member 11 and supporting members for the backrest 8. The lower end portion 12 of each support rod 9 is bent horizontally inward to serve as a fitting portion for an inclined upper and lower elongated slot 13 formed in the support body 5.

In the embodiment shown in FIG. 1, the portion of the seat plate 7 near the front end of the seat support plate 14 and the front end of the support body 5 are pivotally connected by a horizontal shaft 6, and at a position rearward from the horizontal shaft 6, The left and right side surfaces of the support body 5 are formed with inclined vertical long slot holes 13 which are inclined upwardly and backwardly. code 17
are pins that rotatably connect the upper and lower midpoints of the vertical portions of the pair of left and right support rods 9, 9 to the midpoints in the longitudinal direction on both left and right sides of the seat plate 7, and the base ends of each pin 17 are It is screwed onto the flange portions 18 on both the left and right sides of the plate 15 on the seat plate 7.

With this configuration, when the seat plate 7 is tilted rearward and downward by an appropriate angle θ1, the pivot pins 17, 17 between the seat plate 7 and the pair of support rods 9, 9 move downward, and the two support rods 9 , 9 is moved downward along its longitudinal direction while being fitted into the inclined upper and lower elongated slots 13 in the support body 5,
The backrest 8 attached to both support rods 9, 9 is also inclined so that its upper end side moves rearward. At this time, the angle θ1 at which the seat plate 7 is inclined is greater than the angle θ1 at which the support rod 9 is inclined, and the angle θ2 at which the backrest 8 is inclined.
The degree to which
is related to the inclination angle with respect to the vertical direction (see Figure 3).

In this way, when the seat plate 7 and the backrest part 8 are tilted rearward in conjunction with each other, the fact that the angle θ1 of the inclination of the seat plate 7 is smaller than the inclination angle θ2 of the backrest 8 allows a more comfortable posture.

In this embodiment, since the connection position of the seat plate 7 to the support body 5 by the horizontal shaft 6 is near the front end of the lower surface of the seat plate 7, when the seat plate 7 is tilted in the rearward direction, the front end portion of the upper surface of the seat plate 7 is The amount of increase can be determined and reduced,
Therefore, the person sitting on the chair 1 does not have to lift his/her legs too much, and the phenomenon of the hem of the shirt being rolled up when sitting down again is eliminated.

In addition, it becomes easy to provide the horizontal axis, which is a rotational support point of the seat plate relative to the support body, at a position closer to the front of the seat plate in the middle of the front and back. In particular, when a horizontal axis is provided near the front end of the bottom surface of the seat plate, the seat plate tilts backward while the front end of the seat plate remains at a substantially constant height, lifting the sitter's legs off the floor. , the conventional drawback of strongly compressing the lower side of the thigh near the knee can be easily overcome.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a side view of the chair, FIG. 2 is a perspective view of the main parts, and FIG. 3 is a side view showing the functions. 1...chair, 2...legs, 4...posts, 5...
Support body, 6...Horizontal axis, 7...Seat plate, 8...Backrest, 9,9...Support rod, 10...Bullet support means,
11... Armrest member, 12, 12... Lower end portion, 1
3... Slanted upper and lower long slots, 17, 17... Pin.

Claims (1)

[Scope of utility model registration request] The front part of the seat plate is rotatably supported on the front part of the support body of the chair on a horizontal axis, and the seat plate is tilted backward against the elastic biasing means installed between the support body and the seat plate. On the other hand, a pair of left and right support rods to which a backrest is attached to the rear are formed into a horizontally L-shape when viewed from the side, and the horizontal portions of both support rods are configured as a support portion of the armrest member. The upper and lower midpoints of the vertical part of the seat plate are pivoted to the front and rear midpoints on both left and right sides of the seat plate, and the lower ends of the left and right support rods are formed at the front and rear midway positions on both left and right sides of the support body. A tilting device for a chair, which is mounted so as to be slidable up and down along a long slot, and configured such that the backrest tilts to a greater extent than the tilt angle of the seat plate in accordance with the backward tilting movement of the seat plate.