JPH048819Y2 - - Google Patents

Description

[Detailed description of the invention] a. Industrial application field The present invention utilizes the tilting motion of the backrest in a seat with a tilting backrest, and changes the longitudinal inclination angle of the seat according to the tilting angle of the backrest. The present invention relates to a seat adjustment device.

b. Prior art and its problems The two major elements of a seat, the seat and the backrest, require ergonomic balance, and the basic shape, external dimensions, etc. of both are designed to maintain balance with each other. However, in the case of a seat with a backrest tilting device, the balance is based on when the backrest is upright, so when the backrest is tilted, the buttocks lean forward and the spine curves, resulting in an unhealthy sitting posture. You can't avoid problems.

As a known example of an attempt to improve seat comfort by focusing on the above-mentioned basic problem, a rocking chair with an integrated backrest, that is, the relative angle of the backrest part is set to an appropriate constant value, has been developed. When the seat is tilted, the front end of the seat lifts up, causing the legs to hang down, which causes fatigue in the thighs.

Another known example is a seat with an adjustable seat surface in which only the front end of the seat can be lifted locally, but the resistance from the seating load acts, so the operating force is heavy, and the front end of the seat can be lifted up locally. It has the disadvantage that it cannot be used for anything other than seats with a particularly low height above the floor, and it also has the disadvantage that it has a dedicated operating mechanism for adjustment, which complicates the structure and impairs the comfort of the surrounding area.

c. Purpose of the present invention The purpose of the present invention is to adjust the front-back angle of the seat, that is, the tilt angle in the front-back direction, in conjunction with the tilting angle of the backrest in a seat with a tilting backrest.
It is an object of the present invention to provide a seat adjustment device that maintains the ergonomic balance between the back and the seat in both the steady sitting position and the napping position, and eliminates the above-mentioned drawbacks of the known examples.

d Structure of the present invention The structure of the present invention is such that only the front end of the seat placed on the upper surface of the leg frame body is movably connected to the leg frame body, and the rear end of the seat can easily float freely. The entire seat has a movable structure, and below the seat,
A horizontal rotation shaft facing the bottom surface of the seat is attached to the leg frame body, a pair of support arms are integrally connected to the rotation shaft in parallel arrangement, and a roller is attached to each rotation end of the support arm. One lever that is attached and maintains a relative angle close to perpendicular to the support arm is integrally connected to the rotating shaft, and the rotating end of the lever and the swinging end of the swinging arm of the back rest are connected by a link. And,
The length of the link is set so that when the backrest is erected, the rear end of the seat is supported by the support arm and floats free from the leg frame body by a certain distance.

e-1 Embodiment Hereinafter, the present invention will be explained in detail with reference to the embodiments shown in the drawings. FIG. 1 is a partially longitudinal right side view showing the main part of an embodiment of the present invention, and FIG. Figure 3 is a partially vertical right side view showing the operating state of the device in Figure 1, and Figure 3 is a vertical front view taken along line X-X in Figure 1; The frame body 2 is a customary filling made of a flexible material such as foamed molding material;
3 is the bottom plate that forms the skeleton of the seat, 4 is the filling 2 and the bottom plate 3
5 is a connecting fitting fixed to the back surface near the front end of the bottom plate 3;
The seat in this embodiment is composed of the bottom plate 3, the skin 4, and the connecting metal fittings 5 as main elements, and the connecting metal fittings 5
By fitting the groove into the front side horizontal member of the leg frame main body 1 from above, only the front end of the seat is movably connected to the leg frame main body 1, that is, rotatably connected to the leg frame main body 1, while the rear end of the seat The seat section is placed on the upper surface of the leg frame main body 1, in other words, the seat section has a movable structure with a function that allows the rear end section of the seat section to easily float freely.

In the space below the seat part, one rotation shaft 6 is disposed horizontally facing the bottom surface of the seat part, and
It is rotatably pivoted to brackets 7, 7 fixed to the leg frame main body 1, and a pair of left and right support arms 8a, 8b are integrally mounted on the rotation shaft 6 in parallel arrangement with each other. rollers 18, 18 are attached to the rotary ends of the support arms, and a lever 9 is provided near the right end of the rotary shaft 6 with respect to the support arms 8a, 8b. When the pivoting end of the lever 9 is turned backward, the pivoting ends of the support arms 8a, 8b are lifted upward, and the rollers 18, 1
The attachment relationship between the lever 9 and the support arms 8a, 8b is set such that the rear end portion of the seat portion is pushed upward via the lever 9 and the support arms 8a, 8b.

Next, 10 is a back support, 11, 11 is a back support support shaft, 1
Reference numeral 2 denotes a swing arm formed by extending the skeleton of the back rest 10, and the back rest 10 is rotatably connected to the leg frame main body 1 via back support support shafts 11, 11. Reference numeral 13 is a link connecting the pivoting end of the lever 9 and the pivoting end of the swinging arm 12. When the backrest 10 is raised, the rear end of the seat is supported by the support arms 8a and 8b, and the legs are supported by the support arms 8a and 8b. The length of the link 13 is set so that the pivoting ends of the support arms 8a, 8b are slightly sunk below the top surface of the leg frame body 1 when the back rest 10 is tilted to its maximum angle. is designed to an appropriate value.

In the general type of seat with a tilting backrest, the swing arm 1
A locking mechanism for adjusting and holding the inclination angle, that is, the rotational position of the backrest 10 is connected to the rotational end of the backrest 10, but is not shown.

In the present invention, the structure of the locking mechanism can be of any type, such as a plunger type using known gas pressure and hydraulic pressure, an interlocking type that combines a tooth plate and a pin, or a helical spring as a sliding shaft. It is possible to select any of the fitted friction type. Each locking mechanism has a restoring spring built in or attached to it, and when the locking function is released, the repulsive force of the restoring spring applies a force in the direction of raising the back rest 10, that is, in the opposite direction to the arrow Q in Fig. 1. The structure is such that a pressing force of

Next, the operation of this embodiment will be explained. In a normal sitting posture, that is, when the backrest 10 is upright, the rear end of the seat part floats freely from the upper surface of the leg frame main body 1 as shown in FIG. The seat is supported by support arms 8a and 8b, which stabilizes its posture, and the upper surface of the seat maintains a substantially horizontal posture. While sitting, part of the sitting load is transferred to the support arm 8 via the seat and rollers 18, 18...
a, 8b, and the lever 9 attempts to rotate in the direction of the arrow R due to the action of the seating load. The support arms 8a, 8b, the lever 9, and the link 13 remain stationary only by receiving mechanical static loads, since the locking mechanism prevents the link 13 from moving in the longitudinal direction.

When the seated person tilts the backrest 10 backwards to switch from a normal posture to a napping posture, the locking function of the locking mechanism is temporarily released and the backrest 10 is tilted in the direction of arrow P, as is known in the art. At the same time as the lever 10 is tilted, the swing arm 12 rotates in the direction of the arrow Q, and in conjunction with this, the link 13 moves forward, and the lever 9
rotates in the direction of arrow R. These series of movements coincide with the action of the lever 9 attempting to rotate in the direction of the arrow R due to the seating load, so the movement progresses at an accelerated pace. When the backrest 10 is tilted to the limit of its tilting range, the rear end of the seat comes into contact with the upper surface of the leg frame body 1, and as a result, the inclination angle of the upper surface of the seat in the front-rear direction becomes backward as shown in FIG. Switched to downward.

The inclination angle of the seat increases in proportion to the increase in the inclination angle of the backrest 10, and the range of change in the inclination angle of the seat can be determined by appropriately designing the dimensions of each part. Since a desired value can thus be secured, it is possible to ensure ergonomic balance between the back seats at any tilt angle of the back rest 10.

When returning the sitting posture from the napping posture to the normal posture,
That is, to return the back rest 10 to the standing position, when the seated person lifts his or her hips in conjunction with the unlocking operation of the lock mechanism, the back rest 10 instantly stands up due to the repulsive force of the restoring spring of the lock mechanism. Return to posture and
In conjunction with the back support 10, the device returns to the state shown in FIG.

As the backrest 10 is repeatedly tilted and raised, a slight relative movement in the front and back direction occurs between the rotating ends of the support arms 8a and 8b and the bottom plate 3, but the rollers 18,
Friction is reduced by the rotation of 18..., so
The operation of the device is extremely smooth.

e-2 Supplementary information on the embodiment Since the support arms 8a and 8b are subjected to their own weight and the weight of the seat, the force that tends to lower the rotating end regardless of the presence or absence of a seating load is exerted on the support arms 8a and 8b. The link 13 is always acting, and therefore only a tensile load is always applied to the link 13, so the link 13 may be made of wire instead of a bar, and the link in the present invention includes a degree of design freedom in this sense. .

In this embodiment, the structure of the bottom plate 3 is designed to be a simple flat plate, but for example, for the purpose of reducing weight or improving cushion characteristics, the bottom plate 3 is changed to a frame shape by cutting out a large part in the center, and the cutout part is shaped like a frame. Even if the structure is changed to a composite structure, such as by stretching a net, there is no problem in terms of the structure of the idea.

The purpose of the roller 18 is to reduce the sliding friction of the contact portion, and since rotation function is not an essential condition, it can be replaced with a sliding piece made of nylon, for example, and the roller in the present invention is designed in this sense. Includes degrees of freedom.

f Effects of the present invention According to the present invention, when the back rest is tilted, the front and rear inclination angle of the seat changes in conjunction with this, and the inclination angle is approximately proportional to the increase in the inclination angle of the back rest. As a result, the ergonomic balance between the back seats can be maintained at any angle of inclination of the back rest, and it has an excellent practical effect in which all the drawbacks of the above-mentioned known examples are eliminated. can get.

In addition, the structure is simple and assembly work, maintenance work, etc. can be carried out with high efficiency.

[Brief explanation of the drawing]

FIG. 1 is a partially vertical right side view showing the main parts of an embodiment of the present invention, FIG. 2 is a partially vertical right side view showing the operating state of the device in FIG. 1, and FIG. X in Figure 1
- It is a longitudinal sectional front view along the X-ray. 1... Leg frame body, 2... Filling, 3... Bottom plate, 5
...Connection fitting, 6... Rotating shaft, 8a, 8b... Support arm, 9... Lever, 12... Swinging arm,
13... Link, 18... Roller.

Claims (1)

[Scope of utility model registration request] In a seat with a tilting backrest, only the front end of the seat placed on the top surface of the leg frame body is movably connected to the leg frame body, and the seat has a functional form that allows the rear end of the seat to easily float freely. The entire structure is movable, and below the seat, a horizontal rotation shaft facing the bottom of the seat is attached to the leg frame body, and a pair of support arms are arranged in parallel and integrally connected to the rotation shaft. In addition, a roller is attached to each rotating end of the support arm, a lever that maintains a relative angle close to a right angle to the support arm is integrally connected to the rotating shaft, and the rotating end of the lever and the back rest are connected together. The link is connected to the swing end of the swing arm by a link, and the link is connected so that when the backrest is raised, the rear end of the seat is supported by the support arm and floats free by a certain distance from the leg frame main body. A seat adjustment device for a reclining seat with a set length.