JPH0414277Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Field of industrial application] The present invention is a seat for converting backrests to be implemented in a railway passenger car, that is, a backrest is provided on both sides of the chair.
The present invention relates to a chair in which the direction of the seat can be changed by converting the cushion to the front or back using a joint link mechanism, and particularly to a convertible backrest type chair with a pillow attached to the backrest.

[Conventional technology]

It is preferable for the pillow of a backrest with a pillow to always be in an upright position relative to the inclination of the backrest, but so that the above-mentioned state of the pillow can be obtained even when the backrest is turned to either the front or back. By configuring the pillow so that it bulges forward and backward, the distance between the front and rear seats can be increased more than necessary so that when the backrest is moved to the front, the front of the pillow in that seat does not come into contact with the back of the pillow in the front seat. must be made larger. Therefore, the number of seats per passenger car is reduced.

Therefore, in order to solve the above-mentioned problems with convertible chairs with pillows and back rests, the upper ends of the front and rear pairs of back rest converting links were attached to the lower part of the back rest, and the lower ends were attached to the upper part of the legrest with pins. In a convertible backrest chair with a link mechanism, a pillow is attached above the backrest so that it can be tilted back and forth on a horizontal axis, and when the backrest is moved to the front or back of the cushion to change the orientation of the seat, the switching operation is performed. A convertible chair with a pillow and backrest has been proposed in which the pillow is set in an upright position relative to the inclination of the backrest in conjunction with the inclination of the backrest.
(See Special Publication No. 57-23494).

[Problem that the invention attempts to solve]

However, in all of the above-mentioned known backrest convertible chairs that are linked to the pillow angle, when the backrest starts to change, the restricting action on the link mechanism that maintains the pillow's upright angle is completely released, so the pillow becomes in a floating state.

Generally, when switching the backrest, you put your hand on the pillow and press it, which makes the pillow unsteady and difficult to push.

Furthermore, if there is an assembly error in the link for converting the back rest, the link mechanism for maintaining the upright angle of the pillow, etc., there is a risk that the pillow will rattle due to vibrations of the vehicle body.

The purpose of the present invention is to solve the above-mentioned problems in the conventional backrest convertible chair with interlocking pillow angle.

B. Structure of the invention [Means for solving the problem] In order to achieve the above-mentioned purpose, the present invention has the following objectives: At the top of 4 are pins 5, 6,
7 and 8 to form a four-bar linkage mechanism, and a pillow 9 is attached above the backrest 3 so that it can be tilted back and forth on a horizontal axis 10, and the backrest 3 is changed to the front or rear of the seat cushion 11 to change the direction of the seat. In a convertible chair with a pillow and backrest configured such that the pillow 9 is set in a raised state with respect to the inclination of the backrest 3 in conjunction with the conversion operation, when the horizontal axis 10 integrated with the pillow 9 is changed. The front and rear ends of a short link 13 whose both ends are supported by guide members 12 provided at the upper ends of both sides of the back support 3 so as to be movable up and down and rotatable back and forth, and which are integrally provided at the end of the horizontal shaft 10; The free ends of a pair of short levers 1A, 2A extending from the upper ends of the pair of back rest conversion links 1, 2 and bent inwardly at a certain angle are connected to the long links 1, 2A and 2A, respectively.
4 and 15 are connected.

[Effect]

When the backrest 3 is shifted to the position shown by the solid line in FIGS. 1 and 2 and is tilted backwards, the front long link 1 is moved by the front short lever 1A tilting backwards.
4 and the rear long link 15 is pushed up due to the rising of the rear short lever 2A, the short link 1
The pillow 9 is raised up substantially vertically through the support 3.

From the state shown by the solid line above, when you put your hand on the back rest 3 or the pillow 9 and push it in order to convert the back support 3 to the front side, the front long link will move as the back support conversion links 1 and 2 swing forward. 14 thrust up and rear long link 15
When the back rest stands vertically as shown by the chain line 31 in FIG. 2, the pillow is located on the upper extension of the back rest 31 as shown by the chain line 91.

When the back support is turned to the front side as shown by the chain line 32 in FIG. 1, the front long link 14 and the rear long link 15
However, when the backrest is turned to the rear side (shown by the solid line in Figures 1 and 2), the pillow operates in the opposite direction to the position shown by the chain line 92.
It is raised against the back support 32 like this.

Front side long link 14 accompanying the conversion of the back support 3 back and forth
Due to the alternating up and down movements of the rear long links 15 and 15, the position of the short link 13 connecting the upper ends of these long links 14 and 15, that is, the pillow support shaft 10, moves up and down somewhat, but the shaft 10 is a guide member. 12.

〔Example〕

As shown in the figure, when the back rest 3 is set to have an inclination angle of 15 degrees and the pillow 9 stands approximately vertically, the pillow 9 will tilt 15 degrees forward and 15 degrees backward as the back support 3 changes back and forth. ,
Since the total range is 30 degrees, the back support conversion link 1,
The inward bending angle of each of the short levers 1A and 2A with respect to 2 is set to 30 degrees.

A short link 13, a pair of front and rear long links 14, 15, and a pillow support shaft guide member 12, which constitute a link mechanism for maintaining the upright angle of the pillow, are arranged along both left and right sides of the back rest 3, and are arranged in a cover case 16. covered.

As shown in FIGS. 3 and 4, the pillow support shaft guide member 12 is made of a rod, and its lower half is inserted into and fixed to a sheath-shaped fitting 17 fixed to the side surface of the back rest 3.

The short link 13 is integrally fixed to the shaft 10 by inserting a cylindrical portion 13A integrally formed on the back surface of the short link 13 into an opening in the end face of the pillow support shaft 10 so as to communicate with the center hole thereof.

A tenon member 18 with a tenon 18A projecting laterally is fitted into the guide member 12 so as to be freely slidable up and down through a vertical hole 18B.

The shaft 10 is supported by loosely fitting a cylindrical portion 13A fixed to the end of the pillow support shaft 10 into the tenon 18A of the tenon member 18.

Figure 5 shows the state when the back support 3 stands vertically during the changeover of the back support, and the tenon member 18
is slightly raised along the guide member 12. That is, the pillow 9 is floating above the upper end of the backrest 3.

C. Effect of the invention The convertible chair with pillow and backrest of the invention has a pair of long links 1 in the front and back that constitute a link mechanism for maintaining the upright angle of the pillow.
4 and 15 are a pair of front and rear links 1 for changing the back support,
Since the pillows 3 and 3 are connected to the upper ends of the pillows 2 and 2, the pillows 3 will not be in a floating state even if the backrest switching operation is started. Therefore, even if the back support 3 is changed while directly placing a hand on the pillow 3 and pushing it, the pillow 3 will not become unstable, and the back support change operation is easy.

In addition, the pillow does not vibrate while the vehicle is moving, making it effective as a convertible chair with a pillow and backrest.

[Brief explanation of the drawing]

Figure 1 is a side view of the convertible chair with pillow and backrest according to the present invention in the installed state, Figure 2 is an enlarged side view showing the operation of converting the backrest and pillow, and Figures 3 and 4 are the surroundings of the pillow support shaft. 5 is a partially longitudinal side view and a front view showing the detailed structure of the backrest; FIG. 5 is a partially longitudinal side view showing the backrest standing vertically; FIG. 1 and 2 are back rest conversion links, 3 is a back rest, 4 is a footrest, 5, 6, 7, 8 are pins, 9 is a pillow, 10 is a horizontal axis (pillow support axis), 11 is a seat cushion, 12 is guide member,
13 is a short link, 14 and 15 are long links, 1A,
2A is a short lever.

Claims (1)

[Claim for Utility Model Registration] The upper ends of the front and rear pairs of back rest conversion links are attached to the lower part of the back rest, and the lower ends are attached to the upper part of the footrest with pins to form a four-bar link mechanism, The pillow is attached so that it can be tilted back and forth on its horizontal axis, and when the backrest is moved to the front or back of the cushion to change the direction of the seat, the pillow is set in an upright position relative to the inclination of the backrest in conjunction with the switching operation. In a convertible chair with pillow and back rest, both ends of a horizontal shaft integrated with the pillow are supported by guide members provided at the upper ends of both sides of the back support so as to be movable up and down and rotatable back and forth. , the front and rear ends of a short link integrally provided at the end of the horizontal axis, and the free ends of a pair of short levers extending from each upper end of a pair of back rest conversion links and bent inward from each other at a certain angle. A convertible chair with a pillow and backrest, each connected with a long link.