JPH0453705Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a chair with adjustable seat height that is widely used for learning or office purposes.

[Prior Art] This type of chair has a pair of columns formed by combining a fixed column member erected at the base and a movable column member so as to be able to slide up and down, and a pair of columns between the upper ends of the movable column members of this column. An erected horizontal member, a nut held within the fixed column member of the support, and a screw shaft screwed onto the nut and having a pressure-receiving stepped portion that receives a load from the seat near the upper end of the nut. A device has been developed in which the screw shaft is screwed up and down and the seat can be raised and lowered by operating force applied to the operating handle.

By the way, in such a chair, when the support is placed inside the seat frame of the seat, the load from the seat is received by the horizontal member, and the load is transferred from the bottom surface of the horizontal member to the screw shaft. It becomes necessary to transmit the pressure to the pressure receiving step section.

[Problem that the invention aims to solve] By the way, not only is the entire weight of the person sitting on the seat of the chair acting on it, but in cases where the person is seated with an impact, the seat of the chair may be affected by several times the static load. Heavy loads may be applied. Moreover, in this type of chair, the load acting on the seat is concentrated on the pressure-receiving stepped portion of the screw shaft, which has to have a small area. Therefore, in the structure described above, it is necessary to make the bottom wall of the horizontal member considerably thick so that it can withstand concentrated loads. However, if the entire horizontal member is made thick, the load of the entire chair increases, making it inconvenient to move the chair as needed.

The present invention aims to solve the above-mentioned problems while minimizing manufacturing waste.

[Means for solving the problem] In order to achieve the above purpose, the present invention
The following configuration is adopted.

That is, the chair according to the present invention has a pair of columns formed by vertically slidingly combining a fixed column member erected at the base and a movable column member, and a pair of columns constructed between the upper ends of the movable column members of both columns. a horizontal member held in the fixed column member of the support column; a screw shaft screwed onto the nut and having a pressure receiving step near the upper end; and a seat support fitting that transmits the load from the seat to the pressure-receiving stepped portion of the screw shaft, and the seat is raised and lowered by screwing the screw shaft up and down by operating force applied to the operating handle. A seat height-adjustable chair configured to provide an adjustable seat height, wherein the seat support is integrally bent and extended upward from a horizontal piece attached to the lower surface of the seat frame of the seat and one side edge of this horizontal piece. A pair of upright pieces, and an auxiliary horizontal piece that is positioned between these upright pieces and extends horizontally from one side edge of the horizontal piece by an amount that is substantially the same as the extension dimension of the upright piece. The bottom wall of the horizontal member is overlappingly attached to the horizontal piece and the auxiliary horizontal piece, and the pressure receiving step of the screw shaft is engaged with the lower surface of the auxiliary horizontal piece. It is characterized by the fact that

[Function] According to this configuration, the load applied to the seat is mainly transmitted from the lower surface of the seat frame to the horizontal piece of the seat bracket, and from this horizontal piece to the pressure receiving stage of the screw shaft via the auxiliary horizontal piece. This will affect the parts of the body. Therefore, as long as this seat bracket is made to have the necessary strength, even if the support is deviated inward from the seat frame, it will not place a large burden on the horizontal members, etc. The load on the seat can be reliably supported by the screw shaft. In other words, with such a structure, even if the horizontal member is made relatively thin and has the necessary minimum strength, the bottom wall of the horizontal member will not be affected by the reaction from the pressure-receiving step of the screw shaft. deformation can be effectively prevented. In particular, this one is superimposed on the bottom wall of the horizontal member, the horizontal piece of the seat bracket, and the auxiliary horizontal piece, so
It can exhibit high strength against the concentrated load.

Moreover, since the seat bracket has the dimensions and shape described above, two parallel cut lines are made on one side edge of the rectangular sheet metal material, and the outer part of the cut is made upward at a right angle. It can be made by simply bending it. That is, the part without the cut line becomes the horizontal piece, the cut and raised part outside the cut line becomes the upright piece, and the part between the cut lines becomes the auxiliary horizontal piece. Therefore, it is possible to manufacture the product at high speed using a simple press device without discharging unnecessary waste materials, and the number of welded parts during assembly is also minimized.

[Example] Hereinafter, an example in which the present invention is applied to a learning chair will be described with reference to the drawings.

As shown in FIG. 1, this chair has a support 3 erected on the base 2 of a leg 1, a seat 4 supported at the upper end of the support 3, and crossbars 5 attached to both sides of the seat 4. A backrest 6 is provided between the upper ends of these crossbars 5.

More specifically, the leg 1 includes a pair of support columns 3 erected on both sides of the upper surface of the base portion 2 . The column 3 is a telescopically slidable combination of a channel-shaped inner column member 31 as a fixed column member and a pipe-shaped outer column member 32 as a movable column member. A mounting bracket 33 having a U-shaped cross section is fixed to the outer column member 32, and a seat bracket 8 is fixed to the upper end of the outer column member 32, and a horizontal member 7 is constructed between the upper ends of the outer column member 32. And the pillar 3
A lifting position adjustment mechanism 9 for changing the vertical relative position of the inner column member 31 and the outer column member 32 is built inside the horizontal member 7. A transmission mechanism 10 that transmits force to the lifting position adjustment mechanism 9 to raise and lower the seat 4 is housed.

The seat 4 is made by attaching a wooden seat frame 42 to the lower peripheral edge of a plywood top plate 41.
A covering material 43 is stretched on the outer surface of the seat frame 42 via a cushion material (not shown). Cutouts 44 are provided in both side frame portions of the seat frame 42. This notch 44 is formed by partially removing the seat frame material, and the horizontal member 7 is located within this notch 44. The crossbars 5 are fixed to both sides of the seat 4 by screw members 52 for fixing the crossbars. That is, as shown in FIG.
5 are bored, and an insert nut (not shown) is buried in a portion of the horizontal bar 5 corresponding to the bolt hole 45. The crosspiece 5 is fixed to the seat 4 by passing the crosspiece fixing screw member 52 through the bolt hole 45, screwing it into the insert, and tightening it. The seat frame 42 of the seat 4 is supported by the support 3 via the seat support fitting 8.

As shown in FIGS. 2 to 4, the seat bracket 8 is
A horizontal piece 81 attached to the lower surface 42a of the seat frame 42 of the seat 4, a pair of upright pieces 82 integrally bent and extended upward from one side edge of the horizontal piece 81, and these upright pieces. 82 and an auxiliary horizontal piece 83 integrally extending horizontally from one side edge of the horizontal piece 81. The horizontal member 7 is attached to. Note that the inward extension dimension of the auxiliary horizontal piece 83 is as shown in FIG.
The dimension is approximately the same as the upward extension dimension of the upright piece 82. The upright piece 82 is attached to the seat frame 42.
The upright piece 82 is provided with a bolt hole 84. Then, insert the screw member 46 for fixing the seat into its bolt hole 84.
The seat support fitting 8 and the seat 4 are coupled by passing through the seat frame 42 and screwing it onto the seat frame 42. In addition, the horizontal piece 81 of this seat bracket 8 and the auxiliary horizontal piece 8
A column 3 with a built-in lifting position adjustment mechanism 9 on the bottom surface of 3
The upper end, that is, the upper end of the outer column member 32 is fixed by welding.

As shown in FIG. 3, the elevating position adjustment mechanism 9
A nut 91 provided at the upper end of the inner column member 31
and a screw shaft 92 screwed into the nut 91. The screw shaft 92 includes, for example, a screw body 92a having a trapezoidal single thread thread carved on its outer periphery, and a small diameter shaft portion 92b integrally provided at the upper end of this screw body 92a. A stepped portion formed at the boundary with the portion 92b is a pressure receiving stepped portion 92c. And this screw shaft 92
The small diameter shaft portion 92b of the seat bracket 8 is made to penetrate through the auxiliary horizontal piece 83 of the seat bracket 8 and the bottom wall 7a of the horizontal member 7 superimposed thereon and protrude into the horizontal member 7. , auxiliary horizontal piece 8 of the pressure receiving stepped portion 92c
3 and is rotatably engaged with the lower surface 83a of No. 3. Therefore, the operating force applied to the operating handle 11 is transmitted to the threaded shaft 92 via the transmission mechanism 10.
The signal is transmitted to the small-diameter shaft portion 92b.

As shown in FIG. 3, the transmission mechanism 10 includes a driven crank 101 fixed to the small diameter shaft portion 92b of the screw shaft 92, and a rotating shaft 11 of the operating handle 11.
1, and the rotational force of this driving crank 102 is transferred to the driven crank 10.
1 and a crank lever 103 for transmitting power to the engine.

With such a configuration, when the operating handle 11 provided at the center of the lower surface of the horizontal member 7 is rotated, the rotational operating force is transferred from the driving crank 102 to the left and right driven cranks 101 via the crank lever 103. The screw shafts 92 of the left and right vertical position adjustment mechanisms 9 are rotated synchronously. As a result, both the screw shafts 92 move forward and backward into the nut 91 held by the inner column member 31 in the vertical direction, and both the left and right columns 3 expand and contract at the same time, and the seat 4
will go up and down.

According to this structure, the upper load of the seat 4 is mainly transmitted from the lower surface 42a of the seat frame 42 to the horizontal piece 81 of the seat bracket 8, as shown in FIG.
This horizontal piece 81 acts on the pressure receiving stepped portion 92c of the screw shaft 92 via the auxiliary horizontal piece 83.
Therefore, as long as this seat bracket 8 has the necessary strength, even if the support column 3 is deviated inward from the seat frame 42, the horizontal member 7
The screw shaft 9
2 makes it possible to reliably support the load placed on the seat 4. That is, there is no need to make the horizontal member 7 thick or add special reinforcing material to the bottom wall 7a of the horizontal member 7 to engage the pressure receiving stepped portion 92c of the screw shaft 92 with the horizontal member 7. .

Moreover, the seat support fitting 8 is made by setting a cut line corresponding to the width dimension of the horizontal member 7 on one side edge of the rectangular sheet metal material, and bending the outside of the cut line upward. Made. That is, the cut and raised portion located on the outside of both the cut lines becomes the upright piece 82, and the portion located between both the cut lines and left without being cut and raised becomes the auxiliary horizontal piece 83. Therefore, there is no waste, and it is possible to save materials and reduce the number of manufacturing steps.

Note that the chair according to the present invention is not limited to one for learning, but may be for office use, for example.

Furthermore, in the above embodiments, the case where the pressure-receiving stepped portion of the screw shaft is brought into direct contact with the lower surface of the auxiliary horizontal piece of the seat bracket has been described. It may be made to engage with the lower surface of the horizontal piece.

[Effects of the invention] As detailed above, according to the invention, even when the support is provided inwardly than the seat frame, it does not place a burden on the horizontal members, etc. The load placed on the seat can be supported mainly by the seat height adjustment screw shaft disposed within the support column via the seat support fitting. Therefore, the seat can be held securely without adopting reinforcement measures such as making the relatively long horizontal member thick, and it is also possible to raise and lower the seat smoothly. Therefore, the overall weight of the chair can be reduced without any reduction in strength or functionality.

In addition, the seat bracket can be constructed using a single sheet metal material without waste, so it is extremely rational. In other words, when making a seat bracket with an L-shaped cross section, a portion that would normally be removed is left and used as an auxiliary horizontal piece, and this auxiliary horizontal piece plays the important role described above. Because there are no parts to discard, there is no need to dispose of any parts, eliminating waste. Therefore, as mentioned above, it is not only possible to reduce the weight compared to the case where the horizontal members are made thicker or special reinforcing materials are added, but it is also possible to save on materials and manufacturing man-hours. can do.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is an overall perspective view, Fig. 2 is an exploded perspective view as seen from the back of the seat, and Fig. 3 is a front cross-section showing the inside of the column and horizontal member. Figure 4 is a perspective view showing the seat bracket, Figure 5 is a perspective view showing the seat bracket.
The figure is an explanatory diagram of the action. 3...Strut, 4...Seat, 7...Horizontal member, 8...
Seat support metal fitting, 9... Lifting position adjustment mechanism, 10... Transmission mechanism, 31... Fixed column member (inner column member), 32
...Movable column member (outer column member), 42...Seat frame, 8
1... Horizontal piece, 82... Standing piece, 83... Auxiliary horizontal piece.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of columns formed by combining a fixed column member erected at a base portion with a movable column member so as to be able to slide vertically;
A horizontal member installed between the upper ends of the movable column members of both of the columns, a nut held in the fixed column member of the column, and a pressure receiving stepped portion screwed onto the nut and near the upper end thereof. the screw shaft, and a seat fitting that is provided at the upper end of the movable column member and transmits the load from the seat to the pressure-receiving stepped portion of the screw shaft, and the screw shaft is A seat height-adjustable chair configured such that the seat can be raised and lowered by screwing together up and down, and the seat bracket is attached to a horizontal piece attached to the lower surface of the seat frame of the seat, and one side of this horizontal piece. A pair of upright pieces that are integrally bent and extended upward from the edge; and a pair of upright pieces that are positioned between these upright pieces and are integrally formed from one side edge of the horizontal piece by a dimension that is approximately the same as the extension dimension of the upright piece. and an auxiliary horizontal piece extending in the horizontal direction, and the bottom wall of the horizontal member is superimposed on the horizontal piece and the auxiliary horizontal piece, and the bottom wall of the auxiliary horizontal piece is A seat height-adjustable chair, characterized in that a pressure-receiving stepped portion of the screw shaft is engaged with a lower surface thereof.