JP4759128B2 - Seat front / rear position adjustment device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a front / rear position adjustment device for a chair seat.
[0002]
[Prior art]
Some conventional swivel chairs are configured such that 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.
[0003]
[Problems to be solved by the invention]
With the spread of OA equipment such as personal computers in recent years, not only the tilt mechanism of the seat as described above, but also the back and front position of the seat with respect to the backrest and armrests are finely adjusted, and the personal computer keyboard on the desk is used. There is a demand to keep the position of the seater in relation to the backrest and armrest optimally. This is based on individual differences due to differences in the physique of the seat.
[0004]
In view of the above-described problems, an object of the present invention is to make it possible to adjust the front and rear positions of a seat of a rotary chair with a simple structure.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) The seat plate mounting bracket on the chair base is provided with rails positioned on both the left and right sides and facing in the front-rear direction so as to slidably guide the left and right lower portions of the seat plate. One of the seat plate mounting brackets is provided with an engaging portion, and the other is provided with an engaged portion in which the engaging portion can be vertically engaged at a plurality of positions in the front-rear direction, and the end of the seat plate is lifted As a result, the engaged state between the engaging portion and the engaged portion is released, so that the seat plate can be moved back and forth with respect to the seat plate mounting bracket , and the rail is greatly moved to the bottom side of the rail. While drilling a mounting hole consisting of a diameter hole and a long hole with a small diameter extending toward the rear following the large diameter hole, on the back surface of the seat plate, corresponding to the large diameter hole in the rail mounting hole, A shaft that has the same or slightly smaller diameter than the long hole, and a shaft that is provided at the tip of the shaft and that has a smaller diameter than the large-diameter hole. A hooked mounting shaft comprising a flange having a diameter larger than the width of the long hole is provided so as to project downward, and the length of the shaft of the mounting shaft is determined by lifting the seat plate, The length is sufficient to release the engagement with the engaging portion.
[0006]
(2) In the above item (1), the engaging portion is a protrusion protruding downward, and the engaged portion is a plurality of concave grooves arranged in the front-rear direction so as to accommodate the protrusion.
[0007]
(3) In the above item (2), a plurality of protrusions constituting the engaging portion are provided.
[0008]
(4) In any one of the above items (1) to (3), the engaged portion is provided inside the front portion of the left and right rails.
[0009]
(5) In any one of the above items (1) to (3), the engaged portion is provided in the center of the rear portion between the left and right rails.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
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 axis (3) extending in the left-right direction at the rear part of the support base (2) supports the left and right sides of the backrest (4), and the left-right direction provided at the tip of the backrest (5) extending forward from the lower end thereof. A facing cylinder (6) is mounted on the shaft. Earpieces (9) provided at the middle position of the backrest (5) of the backrest (4) are rotatably accommodated in the left and right bearing portions (8) of the seat plate mounting bracket (7). The lower end of the armrest strut (10) is attached to the outer end of the bearing portion (8).
[0011]
An ear piece (11) protruding downward is provided at the front end of the seat plate mounting bracket (7). The ear piece (11) is a long hole (12) provided at the front of the support base (2). ) With a pin.
[0012]
As shown in FIG. 1 to FIG. 3, the seat plate mounting bracket (7) is provided with rails (14) extending upward in the front-rear direction at the left and right ends of the horizontal bar (13) extending in the left-right direction. Are firmly welded.
[0013]
The horizontal bar (13) is a steel plate bent in a U shape with the cross section facing upward and bent at both ends in the horizontal direction to form flanges, and both ends are cut out from the top, and the rail (14 ) Is fitted and welded.
[0014]
Similarly, the rail (14) is formed by bending a steel plate in an upward U-shaped cross section, and its inner end is bent horizontally to form a flange (14a), near the front end of the flange (14a). A plurality of 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.
[0015]
At the front and rear of the rail (14), the bottom piece has a mounting hole (16) comprising a large-diameter hole (16a) followed by a small-diameter long hole (16b) extending rearward. It is installed.
The aforementioned ear piece (11) is provided inside the front portion of the rail (14).
[0016]
As shown in FIG. 4, the seat plate (18) in the lower part of the seat (17) shown in FIG. 1 is long in the front-rear direction at a position in contact with the inner side of the rising portion outside the rail portion (7). It has an elongated ridge (20).
[0017]
As shown in FIGS. 4 and 5, the back surface of the seat plate (18 ) is provided so as to correspond to the mounting hole (16) formed in the rail (14) of the seat plate mounting bracket (7). A hooked attachment shaft (19) projects downward. The diameter of the flange (19a) of the mounting shaft (19) is slightly smaller than the large diameter hole (16a) 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).
FIG. 4 also shows the position of the mounting hole (16) of the seat plate mounting bracket (7).
[0018]
In the vicinity of the front part of the back surface of the seat plate (18), two protrusions (21a) constituting the engaging portion are arranged at left and right positions corresponding to the concave grooves (15) of the rail (14) of the seat plate mounting bracket (7). ) Is provided.
[0019]
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).
[0020]
Insert the ridge (20) projecting from the lower surface of the seat plate (18) so as to contact the inside of the rising part on the outside of the rail (14), and insert the flange (19a) of the mounting shaft (19). The large-diameter hole (16a) of the mounting hole (16) of the seat plate mounting bracket (7) is inserted from above.
[0021]
When the seat plate (18) is lifted slightly upward and pulled backward from such an inserted state, the protrusion (20) of the seat plate (18) is guided by the rail (14), and the seat plate (18 ) Moves rearward, and the mounting shaft (19) fits into the long hole (16b) of the mounting hole (16). When the hand is released, the projection (21a) of the seat plate (18) is fitted into the concave groove (15).
[0022]
If the stopper (22) is fixed to the rear part of the seat plate (18) in this state, the stopper (22) will contact the rear end of the rail (14) even if the seat plate (18) is moved forward. In contact therewith, the mounting shaft (19) does not reach the large-diameter hole (16a) of the mounting hole (16), so that the seat plate (18) cannot be detached from the seat plate mounting bracket (7).
[0023]
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 (21a) on the lower surface of the seat plate (18) is Separate from the groove (15) of the rail (14) of the seat plate mounting bracket (7). The length of the mounting shaft (19) is long enough to make this possible.
[0024]
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 protrusion (21a) is Engage with the new groove (15) and lock in place.
[0025]
FIG. 7 shows a modification of the present invention, wherein the protrusion (23) is provided at the center of the rear portion of the seat plate (18), and the center of the side plate (13) of the seat plate mounting bracket (7). Corresponding concave grooves (24) are provided. In this example, the rear end of the seat is lifted to adjust the front-rear position.
[0026]
In addition, although illustration is abbreviate | omitted, a recessed groove (15) can also be attached as a separate member inside the flange (14a), without providing in the flange (14a) itself of a rail (14).
[0027]
【The invention's effect】
According to the first aspect of the present invention, the front-rear position of the seat can be easily adjusted with a simple mechanism.
[0028]
According to the second aspect of the invention, it is possible to perform reliable movement and locking in the front-rear direction with a simple configuration of the protrusion and the recessed groove fitted to the protrusion.
[0029]
According to invention of Claim 3, a latching | locking part is disperse | distributed and it acts reliably without a failure.
[0030]
According to the fourth aspect of the present invention, the front / rear position of the seat can be adjusted by lifting the front portion of the seat that is easy to put on.
[0031]
According to the fifth aspect of the invention, the rear part of the seat can be lifted to adjust the front / rear position of the seat.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view of a swivel chair provided with an embodiment of the device of the present invention.
FIG. 2 is a perspective view of a seat plate mounting bracket of the chair shown in FIG.
FIG. 3 is also a plan view of a seat plate mounting bracket.
FIG. 4 is also a back view of the seat plate.
FIG. 5 is also a side view showing the seat plate mounting bracket and the seat plate in a separated state.
FIG. 6 is a side view showing the seat plate mounting bracket and the seat plate in a coupled state.
FIG. 7 is a perspective view showing a modified example of the seat plate mounting bracket and the seat plate in a separated state.
[Explanation of symbols]
(1) Leg
(2) Support base
(3) Horizontal axis
(4) Backrest
(5) dorsal fin
(6) Shaft cylinder
(7) Seat plate mounting bracket
(8) Bearing part
(9) Ear pieces
(10) Armrest prop
(11) Ear piece
(12) Long hole
(13) Yokohama
(14) Rail
(14a) Flange
(15) Groove (engaged part)
(16) Mounting hole
(16a) Large diameter hole
(16b) Long hole
(17) Seat
(18) Seat plate
(19) Mounting shaft
(19a) Buttocks
(20) ridge
(21) Protruding member
(21a) Projection (engagement part)
(22) Stopper
(23) Protrusion
(24) Concave groove

Claims (5)

The seat plate mounting bracket on the chair base is provided with rails located on both left and right sides and facing in the front-rear direction so as to slidably guide the left and right lower portions of the seat plate, and mounting the seat plate and the seat plate By providing an engaged portion on one side of the metal fitting, and on the other side, an engaged portion that can be engaged in the vertical direction at a plurality of positions in the front-rear direction, and lifting the end of the seat plate, The engagement state between the engagement portion and the engaged portion is released so that the seat plate can be moved back and forth with respect to the seat plate mounting bracket, and a large-diameter hole is formed on the bottom side of the rail. In addition to drilling a mounting hole composed of a small-diameter long hole extending rearwardly following the large-diameter hole, the back surface of the seat plate corresponds to the large-diameter hole in the rail mounting hole. A shaft that is the same as or slightly smaller in width than the width, and is provided at the tip of the shaft. A hooked attachment shaft comprising a flange having a diameter larger than the width of the flange is protruded downward, and the length of the shaft of the attachment shaft is determined by lifting the seat plate and engaging the engagement portion and the engaged portion. A front / rear position adjustment device for a seat characterized by having a length sufficient to release engagement with a portion . The seat front / rear position adjustment device according to claim 1, wherein the engaging portion is a protrusion protruding downward, and the engaged portion is a plurality of concave grooves arranged in the front-rear direction so as to accommodate the protrusion. . The seat front-rear position adjusting device according to claim 2, wherein a plurality of protrusions constituting the engaging portion are provided. The seat front-rear position adjusting device according to any one of claims 1 to 3, wherein an engaged portion is provided inside the front part of the left and right rails. The seat front / rear position adjusting device according to any one of claims 1 to 3, wherein an engaged portion is provided at a center of a rear portion between the left and right rails.

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