JPH049862Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Field of industrial application] The invention is a convertible seat for railway passenger cars.
That is, the present invention relates to a reclining device for a vehicle chair in which the orientation of the seat is changed by switching the seat cushion to the front or back using a parallel link mechanism provided with a backrest on the side surface thereof.

[Prior art] As a convertible backrest chair equipped with a reclining device, Japanese Patent Publication No. 40-27201 and Publication No. 52 of Utility Model Publication No. 52
-There is one published in No. 27450.

The reclining device described in the above-mentioned former publication fixes the tilted position of the back rest by engaging a stopper with one of the saw teeth on the conversion fitting that rotates as the back rest is raised and lowered. .

The reclining device disclosed in the latter publication is configured to fix the inclined position of the back rest by engaging a pin with one of the parallel notches on the slider that moves as the back rest rises and falls.

[Problem that the invention attempts to solve]

Since the reclining devices described in the above-mentioned publications all adjust the angle in stages, there is no degree of freedom in selecting the inclination angle of the backrest, and each time the reclining device is adjusted, there is a shock and a sound is emitted.

Further, as the back rest is raised and lowered, parallel links connected to the back rest are moved, so the operation of raising and lowering the back rest is difficult.

The present invention aims to solve the above-mentioned problems in the conventional reclining device for a convertible seat for a vehicle.

B. Structure of the invention [Means for solving the problem] In order to achieve the above object, the invention uses parallel link mechanisms 2 and 3 provided with the back support 1 on its side.
In a vehicle chair in which the orientation of the seat is changed by converting the seat cushion 4 to the front or rear, a parallel link mechanism 2,
The back rest 1 is supported so as to be tiltable up and down on the left and right axis 6 with respect to the back rest support plate 5 which forms the upper short link of the back rest 1, and between the back support support plate 5 and the back rest 1, there is a An arm rod 8 extending downward from the side surface of the backrest 1 is connected to a rod 1A of a linear stepless locking device 10 disposed inside the sleeve 9. A mounting shaft 11 of the linear stepless locking device 10 is vertically movably supported in a vertical guide groove 12 formed in the sleeve plate, and a spring 13 is provided to constantly pull up the shaft 11 to the upper end of the guide groove 12. , linear stepless locking device 10
The lock release lever 14 and the operating member 15 provided on the upper part of the sleeve 9 are connected via an interlocking system 16, and the interlocking member 17 that responds to the initial movement of the parallel link mechanisms 2 and 3 is connected to the lock release lever 14. It is connected to the interlocking system 16 for the.

[Effect]

The solid lines in FIGS. 1 and 2 show a state in which the back support 1 is erected at a reference angle and the linear stepless locking device 10 is tightened. In other words, since it is locked, even if you sit down and lean on back rest 1, back rest 1 will not fall over. When tilting the backrest 1 backwards, the operating member 15 is operated while seated, and the lock release lever 14 is moved via the interlocking system 16 to release the linear stepless locking device 10.
loosens.

When the backrest 1 is pushed with the back, the backrest 1 tilts backward about the shaft 6, and the rod 10A of the linear stepless locking device 10 is pushed into the main body of the device, and the locking device 10 It rotates upward using the pivot 11 as a fulcrum.

When the user releases the operating member 15 when the back rest 1 is tilted to the desired angular position 1a, the linear stepless locking device 10 is tightened and the back rest 1 is maintained at that tilt angle.

Next, when the operating member 15 is operated to lift the back from the back rest 1, the linear stepless locking device 10 has been released, so the back rest 1 is moved to the shaft 6 by the restoring force of the spring 7.
Stand up to the standard angle with . Then, when you release your hand from the operating member 15, the linear direction stepless locking device 1 is locked.
0 is in the locked state, and the back rest 1 is maintained at the reference angle.

When the back support 1 is pushed to the left in the figure in order to convert the back support 1, as the parallel link mechanisms 2 and 3 start up, the interlocking system 16 becomes parallel, similar to when the operating member 15 is operated by hand. Operated by the interlocking member 17 associated with the linkages 2, 3, the linear stepless locking device 10 is released.

Therefore, the back support 1 and the parallel link mechanisms 2 and 3 are
It continues to stand up without being constrained by the linear stepless locking device 10, and when it reaches a certain position, the pivot 11 of the linear stepless locking device 10 moves down in the longitudinal guide groove 12 against the spring 13. Then, as shown by chain lines 1' and 10' in FIG. 2, the linear stepless locking device also stands up together with the back rest.

Then, after passing the vertical standing position, the axis 11
is raised in the longitudinal guide groove 12 by the pulling action of the spring 13, and when the back support 1 and the parallel link mechanisms 2 and 3 have been turned to the opposite side, the operation of the interlocking member 17 with respect to the interlocking system 16 is stopped. The linear stepless locking device 10 is locked.

The above conversion of the back rest 1 is performed even when the back support 1 is in a reclined state, and the back support 1 is always maintained at the reference angle when the conversion is completed.

〔Example〕

The lower ends of each link of the parallel link mechanisms 2 and 3 are attached to the lower center of the sleeve 9 by fulcrum shafts 18 and 19, respectively, and the upper ends of each link are attached to the back support plate 5 by connection shafts 20 and 21, respectively.

The parallel link mechanisms 2 and 3 and the back support plate 5 are provided on the left and right outermost sides of the back rest 1, and the left and right back support plates 5 are
They are integrated through a back support tube 22 that passes through the lower part of the back support 1 from side to side.

In the case of a chair that seats two or three people, the backrests are individually supported on backrest support tubes 22 so that they can be raised and lowered individually, armrests 8 are attached to each backrest, and armrests 8 are attached to each seat. It is connected to a linear stepless locking device installed at the The back rest raising/lowering central shaft 6 and the back rest support tube 2
2 is of course concentric.

The front and rear switching positions of the parallel link mechanisms 2 and 3 are as follows:
It is regulated by stoppers 23 and 24 provided on the inner surface of the sleeve 9.

The reference angle position maintenance spring 7 of the back rest 1 is made by arranging a pair of waveform leaf springs before and after the back rest up/down central axis 6.
Their central portions are fixed to the back support plate 5, and the upper and lower ends of each wave leaf spring 7, 7 are brought into contact with the front and rear side edges of the arm rod 8, respectively. Instead of the wave-shaped leaf spring, a torsion coil spring may be provided around the shaft 6, and one end of the spring may be hooked to the back support plate 5, and the other end may be hooked to the arm lever 8, that is, the side of the back rest 1.

The linear stepless locking device 10 is a rod-shaped friction brake mechanism described in, for example, Japanese Patent Publication No. 56-27733, that is, one rod and a pair of twisted rods wound in different directions around the rod. When a pair of torsion coil springs are simultaneously expanded in diameter using a single common lever, the braking action is eliminated, allowing the rod to move forward and backward.
When you stop operating the lever, the torsion coil spring contracts in diameter and grips the rod, making it impossible for the rod to move forward or backward, and is commonly known as a mechanical lock.

The mounting shaft 11 of the linear stepless locking device 10 is slidably fitted into the longitudinal guide groove 12 via a slide metal 25. Although not shown in the figure, the upper end of the pivot spring 13 is fixed to the upper part of the sleeve 9.

The operating member 15 for the lock release lever 14 of the linear stepless locking device 10 consists of a pair of vertically swinging levers arranged in a crosswise manner in the armrest portion 9A of the sleeve 9, and the operating end of each lever 15 Comes with knob 15A.

Common 1 in the center of the pair of levers 15, 15
A book link 26 is connected in a hanging manner, and the lower end of the link 26 is connected to the lock release lever 14.
A pin 31 is attached to the member 27A at the end of the wire 27.
and are connected by engagement of the vertically elongated hole 32. That is, the hanging link 26 and the wire 27 constitute the interlocking system 16.

The interlocking member 17 for automatic release, which responds to the initial movement of the parallel link mechanisms 2 and 3, consists of a pair of longitudinally arranged front and rear long links. is hung at the top of the. A pin 28 provided at the lower end of each interlocking member 17 is fitted into and supported by a vertical guide hole 29 provided at the lower part of the sleeve 9.

Further, the pin 28 at the lower end of the interlocking member protrudes to a position where it engages with the lower edge of the lower link when the parallel link mechanisms 2 and 3 have completed conversion.

Therefore, as shown in FIG.
3, and the suspension spring 30 is stretched. The left interlocking member 17 is pulled up by the action of the suspension spring 30 until the pin 28 hits the upper end of the vertically elongated hole 29.

A lever 33 is attached to the end member 27A of the wire 27 and is swingable around a connecting pin 31 with the hanging link 26 as a central fulcrum.
Both ends of the linking members 3 are fitted and supported in vertical holes 35 at the upper ends of each interlocking member 17 via pins 34, respectively.

Therefore, when the backrest 1 is changed from the state shown in FIG. 30 and rises, pushing up the pin 34 on the right end of the lever 33, the lever 33 rises with the pin 34 on the left end as a fulcrum, and the wire 2 connected to the center of the lever 33 rises.
7, the lock release lever 14 is operated.
In other words, the reclining device is immediately released in conjunction with the start of the backrest switching operation.

C. Effect of the invention Since the reclining device for the convertible backrest type chair for vehicles of the present invention has the above-mentioned configuration, the parallel link mechanisms 2 and 3 are completely immobile when the backrest 1 is raised and lowered, which is different from the conventional chair of this type. Compared to a reclining device in which a parallel link mechanism is moved as the backrest is raised and lowered, the raising and lowering operation is lighter and easier to adjust. In addition, the inclination angle is adjusted by tightening and releasing the linear stepless locking device 10, so the inclination angle can be selected more freely than the conventional reclining device, which adjusts the angle in stages. It has no shock and does not emit noise, and is effective as a reclining device that can be incorporated into convertible backrest chairs for vehicles.

[Brief explanation of the drawing]

FIG. 1 is a side view of a convertible backrest type chair for a vehicle equipped with the reclining device of the present invention, and FIG. 2 is a side view showing a state in which the backrest is changed. 1 is a back rest, 2 and 3 are parallel link mechanisms, 4 is a seat cushion, 5 is a back support plate, 6 is a center axis for raising and lowering the back rest, 7
is the reference angle maintenance spring for the backrest, 8 is the armrest, 9 is the sleeve,
10 is a linear stepless locking device, 11 is a mounting shaft, 12 is a vertical guide groove, 13 is a pivot pull-up spring, 14 is a lock release lever, 15 is a lever operation member, 16 is an interlocking system for lever operation, 17 is a lever Interlocking member for operation.

Claims (1)

[Scope of utility model registration request] A parallel link mechanism with a backrest installed on its side allows the backrest to be moved from side to side with respect to the backrest support plate that forms the upper short link of the parallel linkage mechanism. It is supported so that it can be raised and lowered on a directional axis, and a spring is provided between the back support plate and the back support to maintain the inclination of the back support at a reference angle, and the arm rods and sleeves that extend downward from the sides of the back support are installed between the back support plate and the back support. The mounting shaft of the linear stepless locking device disposed on the sleeve is vertically movably supported in the vertical guide groove formed in the sleeve plate, and The lock release lever of the linear stepless lock device is provided with a spring that constantly pulls the lock to the upper end of the guide groove.
A reclining backrest convertible chair for a vehicle in which an operating member provided on the upper part of the sleeve is connected via an interlocking system, and an interlocking member that responds to the initial movement of the parallel linkage mechanism is connected to the interlocking system for the lock release lever. Device.