JPH0226486B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an adjustable chair, particularly a chair having two adjustment functions of height and seat back, which is mainly used in offices, although not absolutely. It concerns a chair suitable for use.

(Objective of the Invention) An object of the present invention is to provide a chair having a seat back and a seat cushion, the positions of which can be adjusted according to the physique of the person sitting and the desired working posture. For maximum adjustment freedom, it is essential that the height of the seat cushion can be adjusted and that the seat back and seat cushion can be tilted. Also, if the seat back is slightly elastic, the user will be extremely comfortable.

(Disclosure of the Invention) The adjustable chair according to the present invention comprises a support leg to which a caster is attached as necessary, an air cylinder and piston device with one end attached to the support leg, and the other end of the air cylinder and piston device. is attached to
a U-shaped structural support member having two shank portions and one web portion interconnecting one end of each shank portion; a sliding guide means attached to the web portion of the structural support member; A pair of arm members rigidly connected to the free ends of each shank portion, a rotation pin attached to each arm member, and a seat bag rigidly connected to the rotation pins and capable of rotating between the arm members. and,
A seat cushion is hingedly connected at one end to the lower end of the seat bag and supported on the web portion via a sliding guide means, the sliding guide means including a biasing member that opposes the sliding movement of the seat cushion. Equipped with.

Preferably, the sliding guide means includes a fixed guide member integral with the U-shaped structural support member, a sliding guide member slidably supported on the fixed guide member, and integrally attached to the sliding guide member. a tube member that supports the seat cushion; the sliding guide member has an internal cavity that accommodates the biasing member; and a guide recess that extends in the sliding direction of the sliding guide member; has an engagement pin which is rigidly attached to the fixed guide member and engages with the guide recess of the sliding guide member to press the biasing member during forward movement of the seat cushion.

The seat back also includes a tubular structure substantially forming the seat back, an elastic protrusion extending upwardly beyond a pivot pin attached to the arm member and carried by the tubular structure, and an elastic protrusion and an elastic protrusion. Preferably, the lower portion of the tubular structure includes at least two resilient metallic support strips each disposed crosswise.

(Example) An adjustable chair according to the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, the chair according to the invention comprises a support leg 1 on which a plurality of casters or wheels 2 are mounted. Support leg 1 has
An air cylinder and piston device 3 as a height adjustment and support mechanism is carried at one end, and a bellows-shaped device 4 surrounds the device 3.

The piston end 3a of the air cylinder and piston device 3 is attached to the cylindrical member 5. This cylindrical member 5 has an arcuate support member welded to it, which support member carries a structural support member 6 . The structural support member 6 has a U-shape with two shank portions and a web portion interconnecting one end of the shank portions, and a pair of arm members at the free end of each shank portion. 7. Attach one end of each firmly. A seat back 8 of a chair is connected to the other end of each arm member 7 using a rotation pin 9 so that the arm member can rotate. Then, one end of the seat cushion 10 of the chair is connected to the lower end of the seat back 8 using a hinge 11.

The seat cushion 10 is inserted in its central region into a pair of fixed guide members 12 which are mounted on the U-shaped structural support member 6 via a sliding guide member 13 which is slidably mounted on the fixed guide members 12. I will support you.

The fixed guide member 12 and the sliding guide member 13 constituting the sliding guide means are shown in detail in FIGS. 3 and 4. In both drawings, seat cushion 10
(Indicated by broken lines in FIG. 2) A part of the internal tubular structure 14 is shown.
4, a sliding guide member 13 is rigidly connected by a bolt 15. This sliding guide member 13 has an internal cavity 16 in which a spiral spring 17 is housed as a biasing member that abuts against the runner 18 .

The sliding guide member 13 also has a guide recess 19 opening into the internal cavity, in which an engagement pin 20 that engages the runner 18 slides. Note that the engagement pin 20 is rigidly attached to the fixed guide member 12. The fixed guide member 12 attached to the U-shaped structural support member 6 comprises an inwardly curved portion 12 a supporting and guiding the sliding guide member 13 .

Therefore, the inclination of the seat bag 8 and the position of the seat cushion 10 can be changed to the positions shown by dashed lines in FIGS. 2 and 3. At this time, the sliding guide member 13 moves to position 13' in FIG. 3 and compresses the spiral spring 17. Therefore, the engagement pin 20 is located at the rearmost end of the guide recess 19;
That is, in FIG. 3, the right end position is taken. Due to this, the seat back 8 is attached to the rotation pin 9.
about the axis to position 8' in FIG.
On the other hand, since the seat cushion 10 is connected at one end to the seat bag 8, it simultaneously slides on the fixed guide member 12 and assumes the position 10'.

As shown in FIGS. 5 and 6, the seat bag 8 comprises a tubular structure 21 which substantially forms the seat bag, and the tubular structure has two sections on both sides thereof.
each having two upwardly extending tubular members. The tubular structure 21 forming the seat bag is
Rotating pins 9 attached to the arm members 7 are located at the upper ends of these tubular members, respectively. Each upwardly extending tubular member carries at its upper end a respective resilient projection 22 in the form of a resilient web;
On the other hand, the elastic protrusions 22 carry on their protrusions an upper connecting member 23, which has an elastic metal support strip 24.
Equipped with.

Therefore, the seat back 8 of the chair according to the present invention
The upper part of the seat will automatically adjust according to the seated person's posture. The seat bag 8 and the seat cushion 10 are each formed from metal tubing and can be coated with expanded plastic material to give them the desired external shape and flexibility. Multiple metal support strips 24
are arranged on the seat cushion 10 and the seat bag 8, respectively, so that they can be supported by the central portions of each of the seat cushion and the seat bag.

The height adjustment device, i.e. the air cylinder and piston device 3, allows the height of the seat cushion to be adjusted according to the requirements of the occupant by means of an operating lever 25 and a linkage 26.

Therefore, according to the adjustable chair according to the present invention, the seater can easily adjust the height by applying pressure to the seat back of the chair.
The seat bag and seat cushion can be moved to desired positions.

In particular, the forward movement of the seat cushion 10 associated with the change in the inclination of the seat back 8 causes
Ensure that the center of gravity of the chair and the occupant is located above the central area of the supporting legs. Therefore, it is possible to obtain a chair with high stability and with a small bending moment acting on the support structure member, no matter what posture the seated person takes.

[Brief explanation of drawings]

FIG. 1 is a partially sectional front view of a chair according to the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. FIG. 4 is a front view of the portion shown in FIG. 3, and FIG. 5 is a partial longitudinal cross-sectional view of the chair shown in FIGS. 1 to 4. FIG. 6 is a partially enlarged rear view of the chair shown in FIG. 5, and FIG. 6 is a side view of the chair shown in FIG. DESCRIPTION OF SYMBOLS 1... Support leg, 2... Wheel, 3... Air cylinder and piston device, 4... Bellows type device, 5...
... Cylindrical member, 6 ... Structural support member, 7 ... Arm member, 8 ... Seat back, 9 ... Rotating pin,
10... Seat cushion, 11... Hinge, 1
2...Fixed guide member, 13...Sliding guide member, 1
4, 21... Tubular structure, 15... Bolt, 16
...Inner cavity, 17...Spiral spring, 18...
Runner, 19...Guide recess, 20...Engagement pin,
22...Elastic protruding portion, 23...Upper connecting member,
24...Support strip, 25...Operation lever,
26...link mechanism.

Claims (1)

[Scope of Claims] 1. A support leg, an air cylinder and piston device attached at one end to the support leg, two shank portions attached to the other end of the air cylinder and piston device, and one end of each shank portion. a U-shaped structural support member having one interconnecting web portion; sliding guide means attached to the web portion of the structural support member; and rigidly connected to the free end of each shank portion of the structural support member; a pair of arm members, a rotation pin attached to each of the arm members,
a seat bag that is rigidly connected to the rotation pins and can be rotated between the arm members; and a seat cushion that has one end hingedly connected to the lower end of the seat bag and is supported on the web portion via a sliding guide means. A chair, characterized in that the sliding guide means comprises a biasing member that opposes the sliding movement of the seat cushion. 2. In the chair according to claim 1, the sliding guide means includes a fixed guide member integrated with the U-shaped structural support member, and a sliding guide member slidably supported by the fixed guide member. , a tube member integrally attached to the sliding guide member and supporting the seat cushion, the sliding guide member having an internal cavity housing the biasing member and extending in the sliding direction of the sliding guide member. The fixed guide member is rigidly attached to the fixed guide member and engages with the guide recess of the sliding guide member to press the biasing member when the seat cushion moves forward. A chair with matching pins. 3. In the chair according to claim 1, the seat back extends upwardly beyond the tubular structure that substantially forms the seat back and the pivot pin attached to the arm member. A chair comprising a carried resilient projection and at least two resilient metal support strips respectively disposed on the resilient projection and on the lower portion of the tubular structure.