JPH0523077Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

This invention pivots the base end of the seat frame to the lower end of the backrest frame so that the backrest frame can be tilted back, and also pivots the base end of the armrest frame to the midway part of the backrest frame, so that the armrest frame is attached to the seat frame. This invention relates to an improvement in the armrest structure of a seat chair, which is equipped with a stay device that maintains the chair in a horizontal position when it is reclined.

[Conventional technology]

Conventionally, the armrest structure of this type of chair is used with the armrest frame fixed in a horizontal position to the seat frame. Therefore, since the armrest frame gets in the way when the user stands up from the chair and leaves the chair, the armrest frame is folded via a stay device so that it is parallel to the backrest frame. However, in the case of such a chair, in order for a seated person to stand up, the user must touch the floor or the seat with his/her hands while still in the seated position, and since the support point of the hands is low, there is not enough room in the direction of rising, making it difficult to stand up smoothly. I couldn't stand up. Also, if you leave the armrest frame in its unfolded state without folding it, and you put your hand on it, your hand will be supported at a higher position, so you can easily get up, but this time, when you leave the chair, the armrest is held horizontally at a high position. This was extremely inconvenient and dangerous, especially for the elderly and the infirm, as they had to step over the frame and risked tripping and falling.

[Problem that the invention attempts to solve]

This idea was devised as a result of intensive research in view of the above circumstances, and its main problem was to fix the armrest frame in an inclined position with the front side descending when getting up from a chair. To provide an armrest structure of a seat chair with a simple structure that makes it easy to straddle as the support point is set at a high position and the front is set at a low position.

[Means to solve the problem]

In order to solve the above problems, this invention pivots the base end of the seat frame to the lower end of the backrest frame so that the backrest frame can be tilted back, and also pivots the base end of the armrest frame to the middle part of the backrest frame. In an armrest structure for a seat chair comprising a stay device that maintains the armrest frame in a horizontal position with the seat frame when the armrest frame is reclined, (a) the stay device is integrally formed with the armrest frame and extends along the armrest frame; (b) a guide groove is formed in the guide body and extends back and forth; (c) a rod is provided with a sliding portion on the upper side that is slidably fitted into the guide groove; a stay member whose base end is pivotally attached to the seat frame through a shaped portion; (d) a lock groove portion that communicates with the distal end side of the guide groove and is bored upward to restrain the sliding portion of the stay member; (e) is fixed to the guide body and protrudes toward the stay member side, and collides with the rod-shaped portion of the stay member at a predetermined inclined position when the armrest frame is tilted downward to prevent the stay member from tilting. We have taken the technical measure of installing a stopper to restrain it.

[Effect]

When the sliding portion of the stay member is inserted into the locking groove portion of the guide groove, the armrest frame is fixed in a horizontal position with respect to the seat frame. This allows it to be used normally as a seat. Next, when the seated person stands up, the lock is released, the sliding portion is slid along the guide groove, and the stay member is tilted downward so that the tip end of the armrest frame is directed downward. When the armrest frame assumes a predetermined tilted posture, the stopper of the guide body abuts against the rod-shaped portion of the stay member, restraining the tilting of the stay member in the lower direction, and fixes the tilted posture of the armrest frame. Therefore, the seated person can stand up using the high position of the inclined armrest frame as a support point. Additionally, the armrest frame is slanted so that the front is lower, so you can get out of the chair without having to step over it. Further, since the armrest frame in this restrained state is not restrained in the direction of tilting the front side upward, the armrest frame can be returned to the unfolded position parallel to the seat frame by being pulled up.

【Example】

Hereinafter, a preferred embodiment of the armrest structure of a chair according to this invention will be described based on the drawings. The seat chair 1 shown in Fig. 1 as a frame material has a backrest frame 2
The base end of the seat frame 10 is pivotally connected to the lower end of the backrest frame 2.
It is possible to postpone. This pivot part has a known locking mechanism (not shown) that fixes the backrest frame 2 in multiple stages at a predetermined angle.
is provided so that the backrest frame 2 can be fixed at a predetermined backward tilt angle. Further, the base end of an armrest frame 3 is pivotally attached to the middle part of the backrest frame 2. In the illustrated example, the armrest frame 3 integrally includes brackets 15A and 15B for fixing the armrest main body (not shown) to two locations on the upper part of a rod-shaped core member 14 that is the core material of the armrest. Furthermore, a guide body 4, which will be described later, is fixedly installed at the lower end. An attachment boss 12 is provided perpendicularly to the base end of the core member 14, and is aligned with a boss mount 16 fixed to the midway part of the backrest frame 2, connecting the two via the pivot 12 and connecting the two to the backrest frame 2. The armrest frame 3 is pivotally attached to. This armrest frame 3 is supported by a stay device, and the armrest frame 3 can always be maintained in a horizontal position with respect to the seat frame 10 when the backrest frame 2 is tilted backward. Here, the stay device has a guide body 4 provided on the armrest frame 3, a guide groove 5 formed in the guide body 4, an upper end slidably fitting into the guide groove 5, and a lower end pivotally attached to the seat frame 10. It consists of a stay member 9 attached. That is, in the illustrated example, the guide body 4 is connected to the armrest frame 3.
It consists of a plate integrally fixed along the longitudinal direction at the lower end of the. A guide groove 5 is bored in the center of the guide body 4 and extends in the direction in which the guide body 4 extends. The guide groove 5 has a lock groove portion 5C that rises upward on its distal end side. Further, in the case of the illustrated example, the guide groove 5 has a curved groove part 5B connected to the lock groove part 5C and a parallel groove part 5A extending linearly. Here, the pivot point between the backrest frame 2 and the armrest frame 3 is designated as A, the engagement point between the sliding portion 7 of the stay member 9 and the lock groove portion 5C, which will be described later, is designated as B, and the lower end of the stay member 9 and the seat frame 10 are designated as B. Let the pivot point of the seat frame 10 and the backrest frame 2 be D, then A-B-C
-D constitutes a parallel link. Therefore, even if the backrest frame 2 is tilted back in multiple stages, the sliding part 7 of the armrest frame 3 can always engage with the lock groove part 5C at a position parallel to the seat frame 10, and the armrest frame 3 can be It can be fixed horizontally to the seat frame 10. Further, in the guide body 4, a shaft-shaped stopper 6 is provided at an upper position in front of the guide groove 5 and protrudes toward the side where the stay member 9 is arranged (inner side in the embodiment). Next, the stay member 9 that is slidably connected to the guide groove 5 has a sliding portion 6 provided at its upper end.
and a proximal boss portion 13 pivotally connected to the seat frame 10 via the rod-like portion 8. Here, the sliding part 7 has a cylindrical shape with a larger diameter than the guide groove 5, and as is more clearly seen in FIG.
A ring-shaped groove is formed in the middle in the width direction so as to be slidably engaged with the guide groove 5, and a shaft that can be fitted in the width of the guide groove is provided at the center. In the figure, reference numeral 17 denotes a fixing shaft for forming the above-mentioned shaft, which is integrally fixed to the sliding portion 7 with the guide body 4 in between by screws or the like. The rod-shaped portion 8 supporting the sliding body 7 is shaped like a round bar, has a diameter shorter than the protruding length of the stopper 6, and is disposed in contact with the inside of the guide body 4, and its upper end is slidable. It fits into the moving body 7 and is fixed to the moving body 7, and the lower end is welded to the proximal boss portion 13. The proximal end boss portion 13 is rotatably attached to the seat frame 10 with its tip aligned with a boss mount 16 fixed on the seat frame 10 and connected by a screw or the like via a pivot 18. Next, the function of the armrest structure of this chair will be explained. First, if the sliding part 7 of the stay member 9 is engaged with the lock groove part 5C at the tilted position of the backrest frame 2 by the parallel link mechanism, the armrest frame 3 can be assembled as shown by the dashed line in FIG. Frame 3 to seat frame 10
It can be fixed and held in a parallel position. This allows it to be used normally as a seat. Next, when the seated person stands up, the sliding part 7 is removed from the lock groove part 5C and slid along the curved groove part 5B, and the stay member 9 is tilted so that the sliding part 7 moves backward. As a result, the armrest frame 3 is tilted forward via the guide body 4. When the armrest frame 3 assumes a predetermined inclined position,
The stopper 6 of the guide body 4 abuts against the rod-shaped portion 8 of the stay member 9 from above, restraining the stay member 9 from tilting backward at the position shown by the dashed-dotted line in FIG.
Fix the tilted posture. In addition, when the backrest frame 2 is tilted back to the position shown by the dashed-dotted line in FIG.
It is constrained at the dot-dashed line position. In the case of this embodiment, the stopper 6 is located between the pivot point A of the backrest frame 2 and the armrest frame 3, and the stay member 9.
It is set so that the rod-shaped portion 8 abuts when the position B' of the sliding portion 7 of the stay member 9 comes on the line connecting the lower end and the pivot point C of the seat frame 10. As a result, when the armrest frame 3 is tilted forward, it receives a load at points A-B'-C, which are on the same straight line, so that the stress is dispersed, the armrest frame 3 can withstand heavy loads, and reliability is increased. Further, as shown in FIG. 2, the curved groove portion 5 of the guide groove 5 is formed to correspond to the displacement of the locus of the stay member 9 when the backrest frame 2 is tilted backward, and the curved groove portion 5 of the guide groove 5 is formed to correspond to the displacement of the locus of the stay member 9 when the backrest frame 2 is tilted backward. The shape is set such that the rod-like portion 8 can abut against the stopper 6 at a position where the sliding portion 7 of 9 is on the line connecting the respective pivot points A-C. In this embodiment, the armrest structure of the seat chair 1 was explained based on a frame, but this seat chair 1 has a core material or cushion on each of the frames, and the outer periphery is covered with cloth or vinyl. Of course, it can be completed with a known structure such as covering with a sheet of leather or the like. Further, in this invention, the guide body 4 is plate-shaped, but the shape of the guide body is not particularly limited in this invention, and may be rail-shaped or shaft-shaped. The shape and configuration of the sliding body 6 are not particularly limited as long as it can slide along the guide groove 5 in combination with the guide body 4. In other words, it goes without saying that various design changes may be made within the scope of this invention.

[Effect of the idea]

This device has the above-mentioned structure and therefore has the following special effects. (1) When standing up from a chair, the armrest frame is inclined so that the front is lower, so that the support point of the hand can be set higher in order to place the hand on the inclined armrest frame. This makes it easier to apply force in the standing up direction while remaining in a seated position, and allows the user to stand up easily. (2) The backrest frame is inclined so that the front end is lower, so that the user can straddle the backrest frame after standing up without tripping over it. (3) Furthermore, the armrest frame is only restrained from tilting downward, not upward, so that the armrest frame can be easily returned from the inclined position to a horizontal position by lifting it at any time. (4) By forming a guide groove in the guide body and providing a stopper, the armrest frame can be restrained in a forward tilted position even if the backrest frame is tilted backward in multiple stages, which is convenient. (5) The structure is simple, so that it is suitable for industrial mass production, can reduce costs, and is highly reliable.

[Brief explanation of drawings]

Fig. 1 is a side view showing the armrest structure of the chair of this invention as a frame, Fig. 2 is a side view showing the displacement of the armrest frame when the backrest frame is tilted backward, and Fig. 3 is a side view showing the armrest frame when the backrest frame is tilted. FIG. 3 is a plan view of main parts showing the stay structure. 1... Seat chair, 2... Backrest frame, 3... Armrest frame, 4... Guide body, 5... Guide groove, 6...
Stopper, 7... Sliding part, 8... Rod-shaped part, 9...
Stay member, 10... Seat frame.

Claims (1)

[Claims for Utility Model Registration] (1) The base end of the seat frame is pivoted to the lower end of the backrest frame so that the backrest frame can be tilted back, and the base end of the armrest frame is pivoted to the middle part of the backrest frame. , an armrest structure for a seat chair comprising a stay device that maintains the armrest frame in a horizontal position with the seat frame when the armrest frame is reclined, the stay device being integrally formed with the armrest frame and extending along the armrest frame. A guide body, a guide groove provided in the guide body and extending back and forth, and a sliding part provided above that slidably fits into the guide groove, the base end of which is pivotally connected to the seat frame via a rod-like part. a stay member that is connected to the guide groove on the distal end side and is bored upward to restrain the sliding portion of the stay member; An armrest structure for a seat chair, comprising: a stopper that abuts against a rod-like part of a stay member at a predetermined tilted position when the frame is tilted downward to restrain the tilting of the stay member; (2) The location of the stopper is a line connecting the pivot point between the armrest frame and the backrest frame, the pivot point between the stay member and the seat frame, and the sliding part of the stay member that slides in the guide groove. An armrest structure for a seat chair, characterized in that the armrest structure of the seat is set at a position where it abuts against a rod-like part of a stay member at a position where the armrest is in a straight line.