JPS63255013A - Seat reclining simultaneously with backrest seat part - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Industrial Application Field The present invention relates to a seat with a backrest tilting device, which is used for a vehicle or a vehicle, in which the longitudinal inclination angle of the seat portion is changed in proportion to the inclination angle of the backrest. Pertains to indoor seats.

b. Prior art and its problems The seat and backrest, which are the engineering elements of a seat, require ergonomic balance, and the basic shape, external dimensions, etc. of both are designed to maintain balance with each other. However, with seats equipped 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 a seating posture that causes fatigue. It cannot escape serious drawbacks.

Known examples of improving the comfort of seats by focusing on these critical drawbacks include a rocking chair with an integrated back and seat, that is, a rocking chair in which the relative angle of the back rest is kept constant at an appropriate value; There are cushions that allow you to adjust the seat surface by lifting up only locally, and cushions that extend forward in conjunction with the tilting motion of the backrest.

Rocking chairs have the disadvantage that when the back rest is tilted, the front end of the seat lifts up and the counterfeit hangs down, which causes thigh fatigue. It has the drawback that the operating force is heavy and cannot be used for anything other than seats with particularly low seat heights above the floor, such as passenger car seats.Furthermore, it has a dedicated operating mechanism and is complicated to handle. Because extra distance between the front and rear seats is required, especially for vehicles, this has the economic disadvantage of reducing seating capacity.

Furthermore, in conventional seats, the operating mechanisms for adjusting the backrest angle are all manually designed, including levers, handles, and push buttons, and in order to ensure good operability, the operating mechanisms are sometimes mounted on the armrests. Since there are so many of them, the operating mechanism often becomes a design obstacle when incorporating other accessories such as a built-in ashtray, a folding storage table, a pocket, etc. into the armrest.

C9 Purpose of the Invention The present invention provides a seat with a tilting backrest, by changing the front-rear inclination angle of the seat portion, that is, the inclination angle in the front-rear direction, in proportion to the inclination angle of the backrest, thereby improving the stability of the sitting posture. It is an object of the present invention to provide a seat that simultaneously tilts the seat back and seat, which allows ergonomic balance between the back chambers to be obtained in any nap position and eliminates the drawbacks and inconveniences of the above-mentioned known examples. The main idea is to change or increase the longitudinal inclination angle of the seat by lowering the rear end of the seat, and to restore the longitudinal inclination angle of the seat, use pedal operating force to lower the seat. A movement mechanism is provided that applies a pushing force to the seat, allowing the seated person to move the rear end of the seat up and down while sitting. potential energy,
Its greatest feature is that it can be retrieved with a simple operation by a seated person without using a power source.

d0 Structure of the Present Invention The structure of the present invention is such that only the front end of the seat is rotatably connected to the leg frame body, and the rear end of the seat is movable up and down, making the entire seat a movable structure. None, below the seat, a horizontal rotation shaft facing the bottom of the seat is attached to the leg frame body, and a support arm and a connecting lever are attached to the rotation shaft, either integrally or separately, and the support arm The height of the rear end of the seat is maintained by supporting the bottom of the seat directly or in an interlocking manner at the rotating end of the seat, and the above components are combined with the following two components separately. It is true.

(1) The rotating end of the connecting lever and the swinging end of the swinging arm of the back rest are connected by a loose link, and when the back rest is raised, the rear end of the seat is released from the leg frame body. The maximum effective length of the loose link is specified so that it can be pushed up to a steady height, and a vertically moving pedal with the operating end located below the front end of the seat is attached to the opening frame body, and the pedal can be rotated. The pedal and the support arm are linked or integrally connected to the shaft so that the pedal and the support arm move in reverse, and the unlocking mechanism of the locking device for adjusting the backrest angle is connected to the pedal or a movable part that is linked to the pedal. In addition, functional play was provided in the connection structure.

■ The rotating end of the connecting lever and the swinging end of the swinging arm of the backrest are connected by a horizontal link, and when the backrest is raised, the rear end of the seat is released from the main body of the opening frame, and the height is maintained at a constant height. The length of the horizontal link is specified so that it can be pushed upwards, and a vertically moving pedal with the operating end located below the front end of the seat is attached to the main body of the opening frame.
The pedal is provided with an auxiliary arm that performs reverse lever movement, and the rotating end of the auxiliary arm supports the bottom surface of the seat directly or in an interlocking manner, so that the rear end of the seat is redundantly supported; Furthermore, the unlocking mechanism of the locking device for adjusting the backrest angle is connected to the pedal or a movable part interlocked with the pedal, and the connecting structure is provided with functional play.

e-1, Embodiment Fig. 1 is a partially vertical right side view showing the main parts of the first embodiment of the present invention, Fig. 2 is a plan view showing the mechanical part excluding the seat part,
Fig. 3 is a partially longitudinal right side view of the seat shown in Fig. 1 when the backrest is tilted; 1 is an open frame body made by combining a plurality of irregularly shaped members; 2 is a flexible material such as foamed molding material; 3 is a bottom plate that forms the skeleton of the seat; 4 is a normal skin that covers the padding 2 and the bottom plate 3; 5 is a connection fixed to the back surface near the front end of the bottom plate 3; With metal fittings, filling 2, bottom plate 3, skin 4
The seat in this embodiment is constructed with the connecting fitting 5 as the main element, and by fitting the groove of the connecting fitting 5 with the front end side horizontal member of the 1 μs frame main body 1, only the front end of the seat can be opened. It is rotatably connected to the frame main body 1, in other words, it constitutes a movable seat portion in which only the rear end portion is vertically movable.

In the space below the seat part, one rotating shaft 6 is disposed horizontally facing the bottom surface of the seat part, and two bearings 7.7 attached to the open frame main body 1 are installed. Two support arms 8.8 for supporting the seat portion on both left and right sides are integrally connected to the rotation shaft 6 in parallel arrangement with each other. , furthermore, support arm 8 and direction 1 are different.
A book connecting lever 9 is integrally connected. Although this embodiment shows a case in which the support arm 8 and the connecting lever 9 are integrally molded, they can also be made as separate parts depending on design considerations. Reference numeral 10 denotes a roller attached to each rotating end of the support arm 8.8.
The height of the rear end of the seat is maintained by directly supporting the bottom surface of the seat via rollers 10.10. Since the purpose of the roller 10 is only to reduce friction at the contact point, it may be replaced with another suitable contact structure, such as a nylon slider, depending on design considerations.

11 is a back support, 12 is a back support shaft, and 13 is a swinging arm formed by extending the skeleton of the back support 11; Can be freely connected. 14
is a loose link that connects the rotating end of the connecting lever 9 and the swinging end of the swinging arm 13 in a freely movable manner, and when the backrest 11 is raised, the rear end of the seat part opens and the frame main body opens. The maximum effective length of the loose link 14 is defined so that the loose link 14 can be pushed up to a steady height by being released from the seat 11, and when the backrest 11 is tilted to the maximum angle, the support arm 8.8 is lowered and the rear end of the seat is pushed up. The dimensional relationship of the entire movement system is set such that the part comes into contact with the open frame main body 1.

In FIG. 2, reference numeral 15 is a locking device for adjusting the backrest angle.
The front end is connected to the open frame main body 1, and the rear end is connected to the swinging end of the swinging arm 13 via a pin 16. By changing the length of the locking device 15, the tilting angle of the backrest 11 can be adjusted. is adjusted and fixed within a certain range. 17 is an attached lock release mechanism, and 18 is a control cable for connecting the lock release mechanism to the operating mechanism.

In the present invention, there is no need to specifically limit the structural type of the locking device (a set of plungers using known gas pressure and hydraulic pressure, an interlocking type that combines a tooth plate and a pin, a sliding type using a helical spring, etc.). Any type of mechanism such as a friction type fitted to the shaft may be adopted, and the connection structure between the lock release mechanism and the operating mechanism may be a combination of two bell cranks and a loose link due to design considerations. The present invention can be configured even if the motion transmission structure is changed.Regardless of the structure type, the locking mechanism has a restoring spring built-in or attached to it, so when the locking function is released, the repulsion of the restoring spring is released. It has a function of applying a force in the direction of raising the back support 11, that is, applying a pressing force in the direction opposite to the arrow Q in FIG.

Next, reference numeral 19 denotes a vertically movable pedal attached to the leg frame main body 1, and the pedal is laid out so that the operating end is located below the front end of the seat, and is fixed to the rotation shaft 6. By connecting the auxiliary lever 20 and the middle part of the pedal 19 with a vertical link 21, they are linked to the rotation axis 6, so that the pedal 19 and the support arm 8.8 cannot be rotated in the opposite direction. The dimensions of the interlocking structure are set so that when the rear end of the seat is at a normal height, the operating end of the pedal 19 comes to rest at a position slightly above the floor.

Reference numeral 22 denotes a control cable operation holder attached to the middle part of the pedal 19, through which the inner cable 23 of the control cable 18 is passed through, and the tip of the inner cable 23 is clamped to the leg frame body 1, and the pedal The connection structure between the lock release mechanism 17 and the pedal 19 is configured such that when the pedal 19 is stepped downward from the normal position, a relative tension is applied to the inner cable 23. In this embodiment, the lock release mechanism 17 is directly connected to the pedal 19, but depending on design considerations, it may be connected to another movable part that moves with the pedal 19. For example, the holder 22 may be connected to the leg frame main body l. The present invention can also be configured by attaching the inner cable 23 to the bottom plate 3 of the seat and clamping the tip of the inner cable 23 to the bottom plate 3 of the seat.

As for the loose link 14 mentioned above, since the load is only a tensile load from the mechanism, there is no need to limit the structure to a highly rigid bar shape, and it is also possible to use a wire as a substitute for design reasons. Loose links in the invention include design freedom in this sense.

Next, the operation of this embodiment will be explained. In a normal sitting posture, that is, when the backrest 11 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 the support arm 8.8, which stabilizes the posture, and the upper surface of the seat has a constant longitudinal inclination angle, with the upper surface slightly inclined backward from the horizontal. While sitting, part of the seating load is applied to the seat and the rollers 10.
, 10 to each rotating end of the support arm 8.8, and when the support arm 8.8 attempts to rotate in the direction of the arrow R, it transmits a traction force in the direction of the arrow Q to the loose link 14.
Since the locking device 15 connected to the pin 16 is in the locked state and prevents movement in the direction of arrow Q, the support arm 8.
8. The connecting lever 9 and the loose link 14 remain stationary only by receiving mechanical static loads.

When the seated person tilts the backrest 11 backward to switch from the normal position to the nap position, first apply force to the operating end of the pedal 19 and press the operating end downward from the normal position.
3, the lock release mechanism 17 is actuated, and the locking device 15 temporarily loses its locking function. Next, if the seated person pushes the backrest 11 backward with his/her shoulders, the backrest 11
is tilted rearward within a predetermined angular range, and the rotating end of the swing arm 13 and the loose link 14 move forward in the direction of arrow Q. In this case, since the loose link 14 is structured to transmit only a tensile load, the support arm 8.8
And the connecting lever 9 is not affected by the movement of the loose link 14, and the seating load at this moment is applied to the pedal 19 via the support arm 8.8, the rotation axis 6, the auxiliary lever 20 and the vertical link 21. In other words, it is supported by the pedal force. When the pedal force is loosened with the backrest 11 tilted, the pedal 19 rotates in the direction of arrow S due to the seating load, but when the operating end of the pedal 19 reaches the normal position, the locking device 15 returns to the locked state,
Therefore, the moment the pedal pressure is relaxed, the backrest 11 is fixed at the desired tilting angle, and the longitudinal inclination angle of the seat portion increases to an inclination angle corresponding to the tilting angle. FIG. 3 shows a state in which the backrest 11 is tilted to its maximum angle, and at this time, the rear end of the seat is in contact with the upper surface of the frame main body 1.

The longitudinal inclination angle of the seat increases in proportion to the increase in the inclination angle of the backrest 11, and the range of change in the longitudinal inclination angle of the seat can be determined by appropriately designing the dimensions of each part. By doing so, a desired value can be secured, so that an ergonomic balance between the back ratios can be ensured at any angle of inclination of the back support 11.

When returning the sitting posture from the sleeping posture to the normal posture, that is, when returning the backrest 11 to the standing posture, when the seated person puts his or her upper body in an upright posture and depresses the pedal 19 to the lowest position, the locking function of the locking device 15 is activated. is temporarily released, and a pressing force in the direction opposite to the arrow Q is applied to the pin 16 by the repulsive force of the restoring spring, so that the back rest 11 instantly returns to the upright position. When the pedal 19 is depressed to its lowest position, the support arm 8.8 and the connecting lever 9
and the seat is restored to the posture shown in Figure 1, so the backrest 11
There is no inconvenience that hinders the backward movement of the loose link 14 due to the rotation of the loose link 14. Furthermore, since the pedal force is expanded by the lever ratio between the pedal 19 and the support arm 8.8, and the seating load is reduced by the amount of pedal force added, the magnitude of the pedal force is several times the weight of the seated person. Since this is enough, the seated person can push up the rear end of the seat portion to the normal position while sitting. Next, when the applied pedal force is relaxed, the pedal 19 begins to rotate in the direction of arrow S due to the seating load, but when the operating end of the pedal 19 reaches its normal position, that is, a position slightly raised from the floor, it locks. ) Since the mounting flt 15 returns to the locked state, the pedal 19 comes to rest at the normal position, and at the same time, the seat and backrest 11 are fixed at the normal position shown in FIG.

e-2, Second Embodiment FIG. 4 is a partially longitudinal right side view showing the main parts of the second embodiment of the present invention, and this embodiment is the same as the pedal 1 in the first embodiment.
9 is directly connected to the rotation shaft 6, and the support arm 28.28, connection lever 29 and loose link 24 are similar to the support arm 8.8 and connection lever 9 in the first embodiment.
and the loose link 14, and have exactly the same functions except for the dimensions. Further, as the pedal 19 is now directly connected, the auxiliary lever 20 and vertical link 21 in the first embodiment are eliminated. 31 in the figure is support arm 2
8.28 is one of the support links that movably connects each rotation end of 28 with the bottom surface of the seat, that is, in this embodiment, the support arm 2
8. This is an example of a case where the bottom surface of the seat is supported in an interlocking manner at the rotation end of 28. Therefore, depending on design considerations, the position of the rotation shaft 6 may be raised to support the support link 31.
．． It is also possible to carry out the present invention in such a manner that the support arm 28.28 is omitted and the bottom surface of the seat is directly supported by the pivoting end of the support arm 28.28.

The operation of this embodiment is completely the same as that of the first embodiment, so a description thereof will be omitted.

e-3, Third Embodiment FIG. 5 is a partially longitudinal right side view showing the main parts of the third embodiment of the present invention, and this embodiment is the same as the pedal 1 in the first embodiment.
9 is mechanically separated and independent from the rotating shaft 6 to redundantly support the rear end of the seat. At this time, the length of the horizontal link 34 is determined so that the rear end of the seat is separated from the leg frame body 1 and pushed up to a normal height. 38 is an auxiliary arm integrally attached to the pedal 19;
The pivoting end of the auxiliary arm is movably connected to the bottom surface of the seat via the support link 31, in other words, the pivoting end of the auxiliary arm 38 engages the seat. The seat of this embodiment is constructed such that the bottom surfaces of the parts are supported in an interlocking manner. Depending on design considerations,
The present invention can also be constructed by eliminating the support link 31 and changing the mounting position of the auxiliary arm 38 so that the rotating end of the auxiliary arm 38 directly supports the bottom surface of the seat.

Regarding the operation of this embodiment, only the differences from the first embodiment will be described. When the backrest 11 is tilted backwards, the pedal 19
When the backrest 11 is rotated in the direction of the arrow P while the pedals 19 are depressed, the rollers 10, 10 move away from the bottom of the seat and descend in the direction of the arrow R, keeping the pedal 19 and the seat still. 34 will move in the direction of arrow Q. Subsequently, when the pedal force applied to the pedal 19 is loosened, the rear end of the seat sinks due to the seating load, and the i-shaped end of the pedal 19 is pushed up in the direction of the arrow S, causing the bottom surface of the seat to move toward the roller 10. ．．
The movement stops when it comes into contact with 10.

f8 Effects of the Present Invention According to the present invention, in an ideal configuration in which the height of the front end of the seat portion remains almost unchanged, the front and back inclination angle of the seat portion is increased in proportion to the inclination angle of the backrest. This makes it possible to maintain an ergonomic balance between the backrests at any angle of inclination of the backrest, and by adopting a pedal operation method, the forward and backward inclination angle of the seat can be maintained at a steady state while the seated person is seated. This provides an excellent practical function of being able to restore the angle. Furthermore, by linking the locking device for adjusting the backrest angle with the pedal operating mechanism, a dedicated operating mechanism is not required, and the advantage is that the backrest and the seat can be adjusted simultaneously with an extremely simple operation.

[Brief explanation of drawings]

FIG. 1 is a partially vertical right side view showing the main parts of the first embodiment of the present invention, FIG. 2 is a plan view showing the mechanical part excluding the seat,
FIG. 3 is a partially longitudinal right side view of the seat shown in FIG. 1 when the backrest is tilted, and FIGS. FIG. 1... Open frame body, 2... Filling, 3... Bottom plate, 5...
...Connection fitting, 6...Rotation shaft, 8...Support arm, 9
. . . Connection lever, 11 . . . Back rest, 13 . ... Auxiliary lever, 21 ... Vertical link, 22 ... Holder,
23...Inner cable, 24...Loose link, 28...
Support arm, 29...Connection lever, 31...Support link, 34...Horizontal link, 38...Auxiliary arm. Patent applicant Tenryu Industries Co., Ltd. Figure 1

Claims (1)

[Scope of Claims] 1. In a seat with a tilting backrest, only the front end of the seat is rotatably connected to the leg frame body, and the rear end of the seat is movable up and down to cover the entire seat. It has a movable structure, and below the seat, a horizontal rotating shaft facing the bottom of the seat is attached to the leg frame body, and a support arm and a connecting lever are attached to the rotating shaft, either integrally or separately. The height of the rear end of the seat is maintained by directly or interlockingly supporting the bottom surface of the seat with the rotating end of the support arm, and the pivoting end of the connecting lever and the swinging arm of the backrest are The maximum effective length of the loose link is defined so that the moving end is connected to the moving end by a freely movable loose link, and the rear end of the seat part is released from the leg frame body and pushed up to a steady height when the backrest is raised. In addition, a vertically moving pedal with an operating end located below the front end of the seat is attached to the leg frame body, and the pedal is linked or integrally connected to the rotation axis, so that the pedal and support arm can be reversed. Further, the unlocking mechanism of the locking device for adjusting the backrest angle is connected to the pedal or a movable part that interlocks with the pedal, and the connecting structure is provided with play to lower the pedal to the vicinity of the lowest position. A seat that simultaneously tilts a seat back and a seat, characterized in that a lock release mechanism is activated. 2. In a seat with a tilting backrest, only the front end of the seat is rotatably connected to the leg frame body, and the rear end of the seat is movable up and down, making the entire seat a movable structure. A horizontal rotation shaft facing the bottom of the seat is attached to the leg frame body below the seat, and a support arm and a connecting lever are attached to the rotation shaft, either integrally or separately, to control the rotation of the support arm. The height of the rear end of the seat is maintained by supporting the bottom of the seat at the end,
The rotating end of the connecting lever and the swinging end of the swinging arm of the back rest are connected by a horizontal link, and when the back rest is raised, the rear end of the seat is released from the leg frame body and reaches a normal height. A vertically moving pedal is attached to the leg frame body, and the length of the horizontal link is specified so that the pedal can be pushed up, and the operating end is located below the front end of the seat. The pivoting end of the auxiliary arm supports the bottom of the seat either directly or in an interlocking manner, redundantly supporting the rear end of the seat, and also locking the locking device for adjusting the backrest angle. A back support seat characterized in that a release mechanism is connected to a pedal or a movable part that interlocks with the pedal, and the connection structure is provided with play so that the lock release mechanism is activated when the pedal is lowered to the vicinity of the lowest position. Partially tilting seats.