JPH0436680Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a chair whose seat height can be adjusted so that the seat can be raised and lowered by a lifting device.

[Prior Art] This type of chair is generally used as a study chair or an office chair, and the conventional chair is designed to be raised and lowered while supporting the seat substantially horizontally.
Therefore, if you sit for a long time when you need to take a forward-leaning posture, such as when doing general office work, you will easily get tired.

Therefore, in recent years, prop-type chairs with tilting seats have been devised. This device is equipped with a mechanism that adjusts the inclination angle of the seat separately from the lifting device. For example, when taking a short break, the seat can be lowered to a lower position and the seat can be horizontal or tilted slightly backwards. After adjusting the seat, when moving to general office work, raise the seat to a higher position and adjust the seat so that it leans slightly forward, so that the person sitting is in a posture suitable for long hours of office work. It was made so that it could be done.

[Problems that the invention aims to solve] However, such prop-type devices require the props to be made of sturdy metal, which increases the weight, making them difficult to use and inconvenient to carry. There is.

Furthermore, since a mechanism for adjusting the inclination angle of the seat is provided separately from the lifting device, the number of parts is large and the manufacturing process is complicated.

The present invention aims to effectively solve the above-mentioned problems.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a seat height adjustable chair in which a lifting device is interposed between the chair body and the seat. A pair of left and right X-links each including first and second link members pivotally connected to each other, and one end of each of the first and second link members of each of these X-links pivoted to the rear end of each of the first and second link members. The third and fourth link members attached to each other and the first and second link members of both X-links are connected and held at a constant crossing angle position, and the crossing angle position can be changed. and an adjustment mechanism, wherein the front ends of the first and second link members are pivotally connected to the front portions of the seat and the chair body, respectively, and the third and fourth link members are pivoted to each other. The other ends of each of the fourth and third link members are pivotally connected to the rear portions of the chair body and the seat, and as the seat moves up and down, the other ends of the fourth and third link members are connected to the first and second link members, respectively.
The link member is characterized by being set to be more displaced in the vertical direction than the front end of each link member.

[Operation] With such means, the elements forming the link mechanism mutually form a chain of restraints. Therefore, by connecting and fixing the first and second link members with each other using the elevating position adjustment mechanism, the entire link mechanism can be held in that position and support the seat and its load.

Further, since the front end of the first link member and the other end of the fourth link member, and the front end of the second link member and the other end of the third link member have different positive centers, the elevating position adjustment mechanism When activated, they move in different trajectories. However, as the means here rises, the fourth
The other end of the link member and the other end of the third link member are connected to the front end of the first link member and the second link member, respectively.
Since the link member is set to be displaced more vertically than the front end, as the seat rises, its rear part is gradually lifted to a higher position than its front part, and the seat is tilted forward. Become.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 and 2, this chair includes a chair body 1, a seat 2 that can be raised and lowered relative to the chair body 1, and a seat 2 that can be raised and lowered between the seat 2 and the chair body 1. It is equipped with a device 3.

The chair body 1 is, for example, made of wood and has an integral backrest 11, and a horizontal seat support part 12 located below the seat 2 has front and rear horizontal members 14 between left and right side plates 13, 15 is constructed in the form of a frame. And, the seat support part 1 of this chair body 1
2 and the seat 2, the lifting device 3 is provided.

The elevating device 3 includes first and second parts that are pivotally connected to each other in order to raise and lower the seat 2 with respect to the chair body 1.
A pair of left and right X links 4 each having link members 41 and 42, and one end 81 at the rear end 41b of the first link member 41 and the rear end 42b of the second link member 42 of each of these X links 4.
It comprises third and fourth link members 81 and 82 to which a and 82a are pivotally connected, and a lifting position adjustment mechanism 5 for changing the lifting position 3 of the seat 2 by manual operation.

As shown in FIGS. 3 and 4, each X-link 4 connects a first link member 41 in the form of an elongated plate and a second link member 42 in the form of an elongated plate from the center of the two from a slightly rearward position. Fulcrum pin 4 at the part
It is pivotably connected at 3. At the rear ends 41b and 42b of each of the first and second link members 41 and 42, there is provided a third link member 81 in the form of an elongated plate that is shorter and smaller than the first and second link members 41 and 42. A fourth link member 82 pivotally connects one ends 81a and 82a to each other via pins 41d and 42d. Note that the front ends 41a, 41a of the first link member 41 and the second link member 42 are pivotally connected to the front end vicinity of the corresponding upper bracket 6 and the front end vicinity of the lower bracket 7 via pins 41c and 42c, respectively. has been done. Further, the other end 81b of the third link member 81 and the fourth link member 82
The other end 82b is pivotally connected to the vicinity of the rear end of the corresponding lower bracket 7 and the rear end of the upper bracket 6 via pins 81c and 82c, respectively.

Note that between the parts near the rear end of the first link member 41,
Connecting bars 44 and 45 are respectively installed between the front end portions of the second link members 42 to prevent the left and right X links 4 from moving differently. The connecting bars 44 and 45 are pipe-shaped and are rigidly attached to the corresponding link members 41 and 42 by welding. Then, the stays 51 and 52 constituting the elevating position adjustment mechanism 5 are respectively engaged between the first link member 41 and the second link member 42 of the pair of left and right link mechanisms forming the restraint chain as described above. There is.

As shown in FIG. 3, the elevating position adjustment mechanism 5 is
an upper stay 51 installed between the first link members 41 of both the X-links 4;
A lower stay 52 is positioned below and installed between the second link members 42 and is screwed into a vertical screw hole 52c provided in the lower stay 52, and its upper end 53a is rotated to the upper stay 51. Screw shafts 53 that are movable in the axial direction and are connected in a continuous manner.
Then, by rotating this screw shaft 53, both stays 5
Operation handle 54 that changes the distance between 1 and 52
It is equipped with the following. The upper stay 51 is shaped like a rectangular pipe, and has connecting pins 51b protruding from end plates 51a covered on the left and right sides thereof. The connecting pin 51b is rotatably connected to the first link member 41. The lower stay 52 is shaped like a rectangular pipe, and has connecting pins 52b protruding from end plates 52a covered on the left and right sides thereof. The connecting pin 52b is rotatably connected to the second link member 42. Note that a nut (not shown) is embedded in the center of the lower stay 52 to form the screw hole 52c.

Next, the operation of this embodiment will be explained. As shown in FIGS. 4 and 5, when the seat 2 is lowered to the lowest position, the pin 82c is connected to the pin 41.
c, and the seat 2 is supported horizontally. From this state, rotate the operating handle 54 in the desired direction to rotate the screw shaft 53 into the screw shaft 5.
2c and lift it up, this screw shaft 53
uses the lower stay 52 as a foothold to push the upper stay 51 upward. As a result, both link members 41 and 42 of the X link 4 operate in the direction of increasing the crossing angle, and the other elements move positively to raise the seat 2. At this time, as the seat 2 rises, the other end 82b of the fourth link member 82 and the other end 81b of the third link member 81 are vertically displaced, and the front end 41a of the first link member 41 and the second link Since the vertical displacement of each of the front ends 42a of the members 42 is set to be larger than the vertical displacement of each of the front ends 42a of the members 42, as the seat 2 rises, its rear part is gradually lifted to a higher position than its front part, and the seat 2 is moved forward. It will tilt.

Further, when the operating handle 54 is rotated in the opposite direction, the screw shaft 53 is screwed into the screw hole 52c and lowered, and the seat 2 gradually returns to the horizontal position while lowering due to the operation opposite to the above. .

As described above, the inclination angle of the seat 2 can be changed, but with this configuration, when the seat 2 is adjusted to a low position during a light break, the seat 2 can be adjusted to a substantially horizontal position. When the seat 2 is adjusted to a high position for general office work, the seat 2 tilts forward, making it possible to take a posture suitable for long hours of work. Moreover, compared to conventional chairs of this type, the operation can be simplified, and
By using the link mechanism 4, the overall weight can be reduced. By integrating the mechanism for adjusting the inclination angle of the seat 2 into the elevating device 3 in this manner, the number of parts can be reduced and the manufacturing process can be simplified.

The lengths and mounting positions of the third and fourth link members, as well as the cross-sectional shapes of each link member and stay, are not limited to those of the above embodiments, and may be varied without departing from the spirit of the present invention. Deformation is possible.

[Effects of the invention] As described above, in the present invention, the seat is tilted forward as it rises, so this type of chair provides a posture suitable for sitting for long periods of time, such as during office work. can be taken. Moreover, since the lifting device is composed of an X-link mechanism,
The overall weight is reduced, and benefits such as a reduction in the number of parts and simplification of manufacturing man-hours can be obtained. Further, since each part of the link mechanism is connected in pairs around the link mechanism, the connected state is more reliable than in the case where sliding pairs are used, and reliability and durability can be improved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a front view, FIG. 2 is a sectional view taken along line A-A in FIG. 1, and FIG.
The figure is an enlarged side view showing the main parts, and FIGS. 4 and 5 are action explanatory diagrams corresponding to FIGS. 3 and 2, respectively. 1...Chair body, 2...Seat, 3...Elevating device,
4...X link mechanism, 5...Elevating position adjustment mechanism,
41...First link member, 42...Second link member, 41a...front end, 41b...rear end, 42
a...Front end, 42b...Rear end, 81...Third link member, 82...Fourth link member, 81a...
...One end, 81b...Other end, 82a...One end, 82
b...Other end.

Claims (1)

[Claims for Utility Model Registration] A seat height-adjustable chair comprising a lifting device interposed between a chair body and a seat, the lifting device being connected to a first and a second chair which are pivotally connected to each other.
a pair of left and right X-links each comprising link members; and third and fourth link members each having one end pivotally connected to the rear end of each of the first and second link members of each of these X-links. and an elevating position adjustment mechanism capable of connecting and holding the first and second link members of both X-links at a constant intersecting angular position and changing the intersecting angular position, The front ends of each of the first and second link members are pivotally connected to the front parts of the seat and the chair body, respectively, and the other ends of each of the third and fourth link members are connected to the chair body and the seat. The fourth,
A seat height-adjustable chair characterized in that the other end of each of the third link members is set to be more vertically displaced than the front ends of each of the first and second link members.