JP5438045B2 - Seat front / rear position adjustment device - Google Patents

Description

  The present invention relates to a seat front-rear position adjusting device.

  In some conventional swivel chairs, the backrest swings backward due to the load of a seated person leaning on the backrest, and the seat tilts and moves back and forth. The thing of such a mechanism has the advantage of improving the comfort of a seated person and eliminating a feeling of fatigue (for example, refer patent document 1).

Japanese Laid-Open Patent Publication No. 2002-282086

  With the spread of OA equipment such as personal computers in recent years, in addition to the tilting mechanism of the seat, in the swivel chair, the front and back positions of the seat with respect to the backrest and armrests are finely adjusted, so There has been a demand to keep the relative position of the backrest and armrest optimal. This is based on individual differences due to differences in the physique of the seat.

  In view of the above-described problems, the present invention provides a seat front / rear position adjustment device that can adjust the front / rear position of the seat of the swivel chair with a simple structure and that does not cause the seat to be detached during the adjustment of the front / rear position of the seat. The purpose is to do.

According to the present invention, the above problem is solved as follows.
(1) A seat plate mounting bracket provided on a chair base, a seat plate that is movable in the front-rear direction and can be mounted at one end of a range in which the seat can be moved back and forth, and the seat plate Before the seat plate reaches the mountable position that is the front end of the front and rear movable range from the rear portion of the front and rear movable range. A stopper that abuts on the rear end of the mounting bracket and prevents the seat plate from moving to the mountable position is provided.

With such a configuration, the front / rear position of the seat can be easily adjusted with a simple mechanism.
Also, when the seat is moved from the mountable position of the seat plate mounting bracket to the mountable position in order to adjust the front and back position of the seat, it is stopped by a stopper before reaching the mountable position. Is done. Therefore, since the seat plate is not removed from the position where the seat plate mounting bracket can be mounted, there is no possibility that the seat will come off.
Furthermore, the structure of the stopper can be simplified, and the seat plate can be reliably stopped before reaching the position where the seat plate mounting bracket can be mounted.

(2) In the above paragraph (1) , a longitudinal hole is formed in the seat plate mounting bracket in the front-rear direction, and a hooked mounting shaft protruding from the back surface of the seat plate is inserted into the long hole, thereby It can be moved.

  With such a configuration, the seat plate can be moved from the mountable position of the washer mounting bracket with a simple configuration.

(3) In the above item (2) , by providing a large-diameter hole at one end of the long hole with a diameter larger than that of the flanged mounting shaft, the mounting shaft can be inserted into the large-diameter hole. It can be mounted on the seat plate mounting bracket at the mountable position.

  With such a configuration, the seat plate can be mounted on the seat plate mounting bracket with a simple configuration, can be moved from the mountable position, and the seat can be moved while adjusting the front / rear position of the seat plate. The possibility of detaching from the mounting position of the seat plate mounting bracket is further eliminated.

  According to the seat front / rear position adjustment apparatus of the present invention, the front / rear position of the seat can be easily adjusted with a simple mechanism. Further, there is no possibility that the seat is detached during the adjustment of the front and rear position of the seat.

It is a disassembled perspective view of the rotation chair provided with one Embodiment of this invention apparatus. It is a perspective view of the seat board mounting bracket of the chair shown in FIG. Similarly, it is a top view of a seat plate mounting bracket. Similarly, it is a back view of a seat board. Similarly, it is a side view showing the seat plate mounting bracket and the seat plate in a separated state. Similarly, it is a side view showing the seat plate mounting bracket and the seat plate in a coupled state. It is a perspective view which shows the seat-plate attachment metal fitting and seat plate of a modification in the state which released | separated.

  FIG. 1 is an exploded perspective view of a swivel chair with casters provided with an embodiment of the device of the present invention. A support base 2 is rotatably mounted at the center of the upper surface of a leg 1 with casters. The horizontal shaft 3 extending in the left-right direction at the rear portion of the support base 2 is supported by a shaft cylinder 6 that supports the left and right sides of the backrest 4 and that is provided at the front end of the backrest 5 that extends forward from the lower end thereof. ing. Earpieces 9 provided at intermediate positions of the backrest 5 of the backrest 4 are rotatably accommodated in the left and right bearing portions 8 of the rear portion of the seat plate mounting bracket 7, and an armrest is placed on the outer end of the bearing portion 8. The lower end of the column 10 is attached.

  An ear piece 11 protruding downward is provided at the front end portion of the seat plate mounting bracket 7, and the ear piece 11 is attached to a long hole 12 provided in the front portion of the support base 2 with a pin.

  As shown in FIG. 1 to FIG. 3, the seat plate mounting bracket 7 is firmly welded to the left and right end portions of the horizontal bar 13 extending in the left-right direction at the rear portion with a cross-shaped upward U-shaped rail 14 extending in the front-rear direction. Configured.

  The horizontal bar 13 is formed by bending a steel plate upward in a U-shaped cross section and bending both ends outward in the horizontal direction to form flanges. The both ends are notched from the top, and the rails 14 are fitted into the notches. Welded.

  Similarly, the rail 14 is formed by bending a steel plate upward in a U-shaped cross section, and its inner end is bent horizontally to form a flange 14a. In the vicinity of the front end of the flange 14a, there are many steps. Concave grooves 15 (six stages in the figure) are arranged in the front-rear direction. The concave groove 15 constitutes an engaged portion that fits into a protrusion of a seat plate, which will be described later.

At the front part and the rear part of the rail 14, the bottom piece is provided with a mounting hole 16 including a large-diameter hole 16 a and a small-diameter long hole 16 b that subsequently extends rearward.
The aforementioned ear piece 11 is provided inside the front portion of the rail 14.

  As shown in FIG. 4, the seat plate 18 in the lower portion of the seat 17 shown in FIG. 1 is provided with a ridge 20 extending long in the front-rear direction at a position in contact with the inside of the rising portion on the outside of the rail portion 7. ing.

As shown in FIGS. 4 and 5, a hooked mounting shaft 19 projecting from the mounting hole 16 drilled in the rail 14 of the seating plate mounting bracket 7 is provided on the back surface of the seating plate 18. It is projecting toward. The diameter of the flange 19 a of the mounting shaft 19 is slightly smaller than the large diameter hole 16 a of the mounting hole 16. The diameter of the mounting shaft 19 is the same as or slightly smaller than the width of the long hole 16b.
In FIG. 4, the position of the mounting hole 16 of the seat plate mounting bracket 7 is also shown.

  In the vicinity of the front portion of the back surface of the seat plate 18, a projecting member 21 having two projections 21 a constituting the engaging portion is attached to the left and right positions corresponding to the concave grooves 15 of the rail 14 of the seat plate mounting bracket 7. Yes.

  Further, as shown in FIGS. 4 and 5, a stopper 22 is attached to the rear portion of the seat plate 18 at a position in the left-right direction corresponding to the rail 14 of the seat plate mounting bracket 7.

  The ridges 20 projecting from the lower surface of the seat plate 18 are inserted so as to contact the inside of the rising portion outside the rail 14, and the flange 19 a of the mounting shaft 19 is inserted into the mounting hole 16 of the seat plate mounting bracket 7. The large diameter hole 16a is inserted from above. Thus, the seat plate 18 can be attached to the seat plate mounting bracket 7 by inserting the flange 19a of the mounting shaft 19 of the seat plate 18 into the large diameter hole 16a of the seat plate mounting bracket 7. The position where the seat plate 18 is disposed is referred to as a position where the seat plate mounting bracket 7 can be mounted.

  When the seat plate 18 is lifted slightly upward and pulled backward from such an inserted state, the ridge 20 of the seat plate 18 is guided by the rail 14, the seat plate 18 moves rearward, and the mounting shaft 19. Fits into the long hole 16 b of the mounting hole 16. When the hand is released, the protrusion 21 a of the seat plate 18 is fitted into the groove 15.

  In this state, when the stopper 22 is fixed to the rear portion of the seat plate 18, even if the seat plate 18 is moved forward in the same manner, the stopper 22 abuts on the rear end of the rail 14, and the attachment shaft 19 is attached to the attachment hole 16. Thus, the seat plate 18 cannot be detached from the seat plate mounting bracket 7.

  In adjusting the front and rear position of the seat 17, as shown in FIG. 6, the front end of the seat plate 18 is slightly lifted as indicated by the dotted arrow, and the protrusion 21 a on the lower surface of the seat plate 18 is moved to the rail portion of the seat plate mounting bracket 7. 14 away from the concave groove 15. The length of the mounting shaft 19 is long enough to enable this.

  In this state, as shown by a dotted arrow at the top of FIG. 6, when the seat plate 18 is moved in the front-rear direction to a desired position and the front portion of the seat plate 18 is lowered, the projection 21 a Engage and lock in place.

  FIG. 7 shows a modification of the present invention. The protrusion 23 is provided at the center of the rear portion of the seat plate 18, and the corresponding concave groove 24 is formed at the center of the lateral plate 13 of the seat plate mounting bracket 7. Is provided. In this example, the rear end of the seat is lifted to adjust the front-rear position.

  In addition, although illustration is abbreviate | omitted, the recessed groove 15 is not provided in the flange 14a itself of the rail 14, but can also be attached as an another member inside the flange 14a.

1 leg 2 support base 3 horizontal axis 4 backrest 5 backrest 6 shaft cylinder 7 seat plate mounting bracket 8 bearing part 9 ear piece 10 armrest strut 11 ear piece 12 long hole 13 side rod 14 rail 14a flange 15 concave groove (engaged (Joint)
16 mounting hole 16a large diameter hole 16b long hole 17 seat 18 seat plate 19 mounting shaft 19a ２０ 20 protrusion 21 protrusion member 21a protrusion (engaging portion)
22 stoppers 23 projections 24 concave grooves

Claims (3)

A seat mounting bracket provided on the support of the chair;
A seat plate that is movable in the front-rear direction and can be attached to one end of the front-back movable range on the seat plate mounting bracket,
Between the seat plate and the seat plate mounting bracket , provided at the rear portion of the seat plate, before the seat plate reaches the mountable position that is the front end of the front and rear movable range from the rear portion of the front and rear movable range. A seat front / rear position adjusting device , comprising: a stopper abutting against a rear end of the seat plate mounting bracket to prevent the seat plate from moving to a mountable position . Bored a long hole oriented in the longitudinal direction to the seat plate mounting bracket, the flanged mounting shaft projecting from the rear surface of the seat plate, by inserting into the slot, No placement claim 1 Symbol and movable back and forth Seat position adjustment device. By providing a large-diameter hole at one end of the long hole with a diameter larger than that of the flanged mounting shaft, the mounting shaft can be inserted into the large-diameter hole, so that the seat plate can be mounted on the seat plate mounting bracket at the position where the seat plate can be mounted. The seat front / rear position adjusting device according to claim 2, which is made possible.

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