JPH0130929Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chair armrest device in which the distance between the left and right armrests of the chair can be moved and adjusted in the elbow width direction.

Conventionally, the armrests of office chairs are integrally attached to the chair, so as shown in Figure 1, the distance between the armrests
In cases where the left and right armrests of the chair cannot be placed in the chair storage area of the desk, they may obstruct the passage and become a hindrance to walking, or the chair may not be placed in the chair storage area. Every time you try to do so, you run the risk of hitting the armrests of the chair against the sleeves of the desk, causing damage to the chair and desk.Furthermore, the distance between the left and right armrests of the chair depends on the body shape and preferences of the person sitting on the chair. Although it would be more practical to be able to adjust the armrest to some extent, conventional armrests are integrally fixed to the chair, which is inconvenient in use.

Also, the desk is usually on the right side (sometimes on the left side)
In this case, if the armrests are fixed with large extensions on the left and right sides of the chair, the armrests on the drawer side will get in the way when you put the drawer in and take it out, making it difficult to change the direction of the chair each time. , I had the annoyance of having to move my chair forward or to the side.

Furthermore, operators who handle computers, office equipment, telephones, etc. are increasingly required to quickly operate equipment with one hand, and when doing so, the armrests of a chair that protrude significantly upward can make it difficult to operate the equipment. The armrests were a huge hindrance to quick operations, and there were also inconveniences such as bumping one's arm or elbow against the armrests.

The present invention was developed in view of these circumstances, and its purpose is to determine the body shape of the person sitting in the armchair, the type of occupation, the size of the opening width of the desk chair storage, and the drawer area of the desk. The user can freely adjust the left and right armrests to a convenient position depending on the position of the user, and the adjustment can be easily made by the user without using any special tools. To provide an armrest device for a chair, which can obtain a secure fixed state without loosening or wobbling at a fixed part after adjusting the position.

In order to achieve the above object, the chair armrest device of the present invention connects the left and right armrest support members extending outwardly of the chair seat to pivots provided at the left and right ends of the lower surface of the chair seat. , respectively, are pivoted so as to be rotatable in the width direction of the elbow about the pivots, and each of the adjustment screws has a grip at a portion of the armrest support member that is closer to the inside than the pivots. are screwed together so that they can move forward and backward, and the distal end side of each screw shaft portion is held rotatably but immovably in the axial direction relative to the chair seating portion.

Hereinafter, the present invention will be specifically described with reference to the drawings.

In the embodiment shown in the drawings, reference numeral 1 denotes a desk, and in the center of the desk 1, a chair storage section 2 for storing a chair 3 is formed as an opening.

The chair 3 includes a chair seat 6, a backrest 4 that rises upward from the chair seat 6 on the back side;
It consists of a support shaft 5 hanging down from the lower surface 6a of the chair seat 6, a leg body 9 with a shaft tube 7 and casters 8, and the leg body 9 supports the support shaft 5 with the shaft tube 7.
The chair seat 6 is rotatably supported around the support shaft 5, and the height of the chair seat 6 can be adjusted using a height adjustment screw 10.

A seat frame 11 is provided around the periphery of the lower surface 6a of the chair seating portion 6, and the left and right portions of the seat frame 11 have grooves extending in the left and right directions, as shown in FIG. An extending seat support plate 13 is attached to the support member 4a of the backrest portion 4 in a criss-cross pattern using screws 14, 14, respectively.

Reference numerals 15 and 15 have a rectangular cross section extending from the lower surface 6a of the chair seat 6 to the left and right outer sides in the elbow width direction (direction of arrow Z shown in FIG. 2), and standing upright in the middle thereof. A pair of armrest support members made of pipes, at the upper end of each of these armrest support members 15,
It supports the armrests 19, 19 of the chair 3.

The armrest support members 15, 15 are pivoted by a pivot 16 that is integrally attached to a bracket 12 that is protruded and fixed to the lower surface 13a of the seat plate 13 of the chair 3 with screws 14'. Katsuko axis 16
It is rotatably supported in the width direction of the elbow using the fulcrum as a fulcrum.

A rotation adjustment means 17 is provided at a portion of the lower surface 6a of the chair seat that is closer to the inside than the pivot shaft 16. By moving the armrest support member 15 in the vertical direction, it serves to rotate and adjust the upper end of the armrest support member 15, that is, the armrest 19, in the elbow width direction.

The rotation adjustment means 17 has an adjustment screw 20 that loosely passes through the armrest support member 15 screwed into a nut 18 welded to the horizontal portion 15a of the armrest support member 15 so as to be able to move forward and backward. The adjusting screw 20 has a grip 20a on its head and a screw shaft portion 20.
A cylindrical portion 20c having a diameter slightly smaller than that of the screw shaft portion 20b is connected to the tip end side of the screw shaft portion b. Said columnar part 20
c is loosely fitted into a through hole 22a bored in the center of the bracket 22 which is fixed to the lower surface 6a of the chair seat with screws 21, 21, and is further provided with a cylindrical part 20c to prevent it from coming off. The ring 23 is inserted and fixed with a dowel pin 24, whereby the adjusting screw 20 can freely rotate around the axis but is held immovable in the axial direction.

Thus, in FIG. 3, by turning the grip 20a of the adjusting screw 20, the nut 18 is threaded onto the adjusting screw 20, thereby causing the armrest support member 15 to move around the pivot 16 at the arrow P. or
In other words, the armrest 19 can be moved by an appropriate amount left and right in the direction indicated by the arrow Q or Q'. Further, the amount of left and right movement of the armrest 19 on the opposite side of the chair 3 can be adjusted in the same manner as described above, and the desired elbow-width spacing between the left and right armrests 19, 19 can be maintained.

In addition, the armrest device of the chair 3 in the present invention is as follows:
Since the armrest support member 15 is moved inward from the pivot 16, the armrest 19 is moved from the pivot 16.
By setting the distance l ₂ from the pivot 16 to the rotation adjustment means 17 smaller than the distance _{l 1 from} the pivot point 16 to the distance l ₁ from Therefore, since it is only necessary to rotate the armrest support member 15, there is an advantage that the width between the armrests 19, 19 can be adjusted to a desired value very easily.

As described above, the chair armrest device according to the present invention allows the width of the interval between the left and right armrest support members to be freely set by grasping the grips of the left and right adjustment screws and threading the screw shafts of the adjustment screws. can. For this reason, even for various types of desks and chairs, the distance between the left and right armrests of the chair can always be made smaller than the opening width of the desk chair storage area, and the chair can be stored in the desk chair storage area. Therefore, if the chair obstructs the passage and gets in the way of walking, or every time you try to put a chair into the chair storage area, the chair can be stored neatly in the armrests of the desk. In addition to preventing damage to chairs and desks caused by hitting the armrests, the distance between the left and right armrests of the chair can be adjusted to accommodate the body shape and preferences of the person sitting on the chair, which improves sitting comfort. It can be used as a good chair.

Furthermore, in the case of the chair armrest device of the present invention, by rotating the left and right adjustment screws, the left and right armrest support members can be independently adjusted to desired positions. For this reason, if one armrest is extremely obstructive due to the occupation of the person sitting in the chair with armrests or the position of the desk drawer, adjust the position of only that one armrest inward or outward as appropriate. This makes it possible to use a chair with armrests very conveniently.

In this way, the chair armrest device of the present invention can be freely adjusted to the left or right depending on the body shape and occupation of the person sitting on the chair with armrests, the opening width of the desk chair storage, the position of the desk drawer, etc. The armrests can be adjusted to their respective positions.

Moreover, the above position adjustment can be made by simply grasping the grips of the left and right adjustment screws and rotating them, so the above position adjustment can be performed without using any special tools. However, this can be done easily. On the other hand, after adjusting the position of the armrest support member, it is possible to ensure that this member is securely fixed without shaking or loosening. In other words, the left and right armrest support members are pivoted to pivots provided at the left and right ends of the lower surface of the chair seat, respectively, so that they can rotate freely in the elbow width direction using the pivots as fulcrums. Even if a large load (for example, the weight of a person sitting on a chair is applied by leaning on the armrest) is applied to the armrest, excluding the force in the direction of rotating the armrest support member, The shaft is received by the pivot. In addition, the force that attempts to rotate the armrest support member in the elbow width direction using the pivot as a fulcrum is
It is reliably received by an adjustment screw screwed into a portion of the armrest support member that is closer to the inside than the pivot shaft. In this case, the rotation of the armrest support member is blocked in the substantially axial direction of the threaded shaft of the adjustment screw, that is, in the direction of the opposing surfaces of the threaded parts that are screwed together, and therefore in the circumferential direction of the screw shaft, that is, in the direction of the screw shaft. Compared to the case where the threading is done in the helical direction of the part, the threaded state does not loosen and there is almost no wobbling of the armrest support member.

Therefore, in the present invention, even if a large load is applied to the armrest support member, the fixed portion of the armrest support member does not wobble or loosen, and a reliable fixed state can be obtained.

[Brief explanation of the drawing]

The drawings show one embodiment of the device of the present invention, and FIG. 1 is a front view of the entire chair equipped with the device of the present invention, and FIG. 2 is a bottom view as seen from the direction of the arrow in FIG. 1.
FIG. 3 is a half-cut front view partially shown in section. 6a... Lower surface of chair seat, 15... Armrest support member, 16... Pivot, 20... Adjustment screw, 20a...
...Grip, 20b...Screw shaft, Z, Z'...Elbow width direction.

Claims (1)

[Scope of utility model registration request] The left and right armrest support members extending outwardly of the chair seat are pivoted to pivots provided at the left and right ends of the lower surface of the chair seat, respectively, so as to be rotatable in the elbow width direction about the pivots as fulcrums. The screw shaft portions of adjustment screws each having a grip are screwed into the portions of the armrest support members that are closer to the inner side than the pivot shafts, and the screw shaft portions of the adjusting screws each have a grip so as to be freely advanced and retracted. An armrest device for a chair, characterized in that the armrest device is held rotatably but immovably in the axial direction relative to a chair seat.