JPH04749Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a tilting device for interlocking the seat body and backrest of a chair used for office use and the like to tilt it back and forth.

Conventional technology Chairs for office use are commonly designed so that the backrest can be tilted back and forth to switch between a working position and a resting position. It is said that it is desirable for the seat body to tilt backward as well. For this reason,
Recently, various chairs have been proposed in which the backrest and seat body can be tilted back and forth in conjunction with each other (see, for example, Japanese Utility Model Application Publication No. 17153/1983).

Problems to be Solved by the Invention However, in the conventionally proposed chairs described above, the backrest and seat body forward and backward tilting mechanisms are prone to malfunctions, resulting in poor operational reliability and durability, and high production costs. Further, there were other problems such as complicated tilting operations.

This invention was made in view of the above-mentioned circumstances, and allows the backrest and seat body to be tilted back and forth in conjunction with each other using a mechanism as simple as possible, and has excellent operational reliability and durability. The purpose of the present invention is to provide a tilting device for a chair that allows tilting to be performed with a single touch operation.

Means for Solving the Problems For the above purpose, the chair tilting device according to this invention has a seat frame disposed in front of a support frame attached to the upper end of the pillar, and a seat frame disposed on the support frame. It is pivoted so that it can freely tilt forward and backward, and a spring is installed between the seat frame and the support frame to elastically bias the seat frame toward the forward tilt side, while a back support frame is attached to the rear of the support frame so that it can tilt forward and backward. The upper part of the seat frame is pivotally attached so that the seat frame and the back support frame can be moved in the same tilting direction via a link mechanism, and the back support frame and the seat frame are fixed to the support frame. A chair tilting device equipped with a locking mechanism for fixing the chair in a posture, the link mechanism comprising:
A first link whose upper end is pivotally connected to the rear end of the seat frame; one end is pivotally connected to the lower end of the first link, and the other end is supported at a position slightly forward of the pivot point of the upper end of the first link. a backwardly bent second link pivotally connected to the frame; and a downwardly curved third link whose front end is pivotally connected to the bent part of the second link and whose rear end is pivotally connected to the lower part of the back support frame. The locking mechanism has one end pivotally connected to the seat frame and the back support frame, and the other end thereof is arranged in an overlapping state and is bored in the other end. It is characterized by being composed of a pair of friction plates in which sliding pins fixed to a support frame are inserted into elongated holes extending in the longitudinal direction, and a lock operation section that controls mutual pressing and release of the friction plates. That is.

Embodiments Hereinafter, this invention will be specifically explained based on illustrated embodiments.

In the figure, reference numeral 1 denotes a support frame consisting of a metal frame with a substantially upwardly open U-shaped longitudinal section, and a bottom plate-shaped mounting plate 3 is attached to the upper end of a vertical pillar 2 at its bottom plate portion 1a.
It is installed in an inclined position with a downward slope towards the rear through the Reference numeral 4 denotes a seat frame made of a metal frame with a substantially downwardly open U-shaped vertical section, and seat mounting pieces 4b, 4b, which extend horizontally to the left and right sides, are integrally formed at both front and rear ends of the top plate portion 4a to provide support. It is arranged so as to fit onto the frame 1 from above,
The left and right side plate parts 1b, 1 of the support frame 1 pass through the left and right side plate parts 4c, 4c at the front part thereof.
The support frame 1 is pivotally connected to be tiltable back and forth by a pivot shaft 5a installed between the support frames 1 and 5b. 6
is an open front side formed by integrally fixing the U-shaped frame material that constitutes the rear wall portion 6a and the left and right side wall portions 6b, 6b, and the cylindrical frame material whose flanges at both ends constitute the top wall portion 6c and the bottom wall portion 6d. A metal box-shaped back support frame with left and right side walls 6 protruding forward.
The support frame 1 can be tilted back and forth by the pivot shaft 5b, which passes through the upper front positions of the left and right side plates 1b and 6b of the support frame 1 and is installed between the upper positions of the rear ends of the left and right side plate parts 1b and 1b of the support frame 1. Possibly articulated.

A coil spring 7 is mounted upright between the bottom plate portion 1a of the support frame 1 and the top plate portion 4a of the seat frame 4 at a position near the rear, and the stored force of the coil spring 7 is Therefore, the seat frame 4 is biased toward the forward tilting side.

Further, the seat frame 4 and the back support frame 6 are connected via a link mechanism 8. This link mechanism 8 consists of two connecting pieces 4 that are vertically fixed to the lower surface of the rear end of the top plate 4a of the seat frame 4 by welding or the like.
A first link 8a in the form of a short strip plate whose one end is pivotally connected to the other end of the first link 8a by a pin 9b is connected between d and 4d, and the other end is connected to the support frame 1 by a pin 9b. A second link 8b consisting of two substantially L-shaped plates is pivotally connected to a pivot 5c installed between both side plate parts 1b, 1b, and one end is pivotally connected between a bent part of the second link 8b by a pin 9c. In addition, the third link 8c is constituted by a downwardly convex curved band plate whose other end is pivotally connected to a pivot shaft 5d installed between the lower portions of both side wall portions 6b of the back support frame 6. Note that the pivot shaft 5b and the pivot shaft 5c are connected to each other by a reinforcing connecting plate 10 at the center thereof.

Further, a pivot shaft 5e is installed between the side plate portions 4c, 4c of the seat frame 4 at a position slightly forward of the pivot shaft 5c on the support frame 1 side, and a large number of band-shaped friction plates 11 are mounted on this pivot shaft 5e. ...is hung through one end. Also, a large number of similar friction plates 12 are provided on the pivot shaft 5d of the back support frame 6...
is passed through one end and pivotally supported. Each of these friction plates 11... and 12... is provided with elongated holes 11a, 12a along the longitudinal direction at the other end. On the other hand, a substantially short cylindrical case 13 is fixed horizontally to the left side plate portion 1b of the support frame 1, and its inner end 1
A support protrusion 1c is cut and raised on the bottom plate portion 1a opposite to the support protrusion 1c, and the sliding pin 14 has its flange-like end 14a housed in the case 13 and the bolt-like other end 14b is attached to the support protrusion 1c. The shaft 5e is horizontally slidably disposed directly below the pivot shaft 5e so as to be inserted into the shaft 5e. Therefore, the sliding pin 14 is connected to the friction plate 1.
These elongated holes 11a... and 12a are arranged alternately with the other end sides of 1... and 12 sandwiched between them.
..., and its inner end 1 is inserted into the case 13.
3a and the flange-shaped end 14a of the sliding pin 14, the coil spring 15 is inserted into the inner end 13a and the bolt-shaped other end 14b of the sliding pin 14. The friction plates 11... and 12... are closely pressed between the holding plate 16 and the other end sides thereof. 16a is a nut that has the function of adjusting the position of the presser plate 16 and preventing it from coming off. Further, at the outer end 13b of the case 13, a lock operating lever 17 is provided with a pin 1 at its base 17a.
The base 17a has a flange-shaped end 1 of the sliding pin 14.
A cam 19 is formed that comes into contact with 4a. However, when the lever 17 is pulled upward, the lever cam 19 pushes and slides the sliding pin 14 inward against the bias of the coil spring 15, thereby causing the friction plates 11... and 12... The clamping pressure is released. Under this release, the seat frame 4 is moved through the long holes 11 of the friction plates 11...
It becomes possible to rotate in the vertical direction within the range of a... Therefore, the friction plates 11... and 12..., the sliding pin 14, the coil spring 15, and the lever 17 constitute a locking mechanism 20, of which the sliding pin 14, the coil spring 1
5. The lever 17 constitutes a lock operation section.
The back support frame 6 is formed with a flat back support support insertion hole 21 made of a cylindrical frame material and passes through in the vertical direction near the rear end, and a bolt 22 is formed in the right side wall 6b and horizontally penetrates from the outside. is supported on a cantilever so that it cannot rotate. A cylindrical pressing body 23 having a substantially square prism exterior is slidably inserted into this bolt 22 and is disposed inside the back support frame 6, and a rotary handle 24 is screwed onto the tip of this pressing body. 23 is a rounded protrusion 23 at the end on the rotating handle 24 side.
It is arranged so that a part of one side where a is provided fits into a sliding groove 21a formed in the front wall of the column insertion hole 21. After inserting the backrest support 25 made of a flat pipe into the support insertion hole 21 from above and setting it at a desired height, the rotary handle 24
When tightened, the backrest support 25 is strongly pressed against the inner wall surface of the insertion hole 21 by the rounded protrusion 23a of the pressing body 23 pressed by the inner end surface 24a of the rotary handle 24, and the backrest support 25 slides up and down. It is immovably fixed to the back support frame 6.

Further, the pedestal 2 has a built-in height adjustment gas cylinder (not shown), and a lift operation lever 27 equipped with a pressing piece 27a that presses a driving protrusion 26 protruding from the upper end is located on the right side of the support frame 1. It protrudes laterally through a dog-shaped long hole 28 bored in the plate. 29 is the seat mounting piece 4b of the seat frame 4...
The seat plate 30 is fixed to the seat plate with screws, and the reference numeral 30 is a backrest fixed to the upper part of the backrest column 25.

In the case of the chair configured as described above, in the working posture in which the seat frame 4 is tilted forward and downward as shown in FIGS. and each friction plate 1
The sliding pin 14 is located in the front part of the second long hole 12a, and the back support frame 6 is also tilted forward. To shift from this working posture to a resting posture in which the seat frame 4 is tilted backwards downwards as shown in FIGS. 11 and...12...
It is sufficient to release the clamping pressure between the two and push down the seat frame 4 against the urging force of the coil spring 7. That is, by this pushing down operation, the second link 8b of the link mechanism 8 is pushed by the first link 8a, and the sixth link 8b is pushed by the first link 8a.
From the state shown in the figure, it rotates in the counterclockwise direction as shown in FIG. 5 about the pivot shaft 5c, and at the same time, the back support frame 6 is pulled by the third link 8c and tilts backward.
If the lock operation lever 17 is released when the seat frame 4 reaches the desired angle, the lock mechanism 20
The sliding pin 14 slides outward due to the accumulated force of the coil spring 15, and together with this, the friction plates 11 and 12 are clamped, and the frictional force between them causes the seat frame 4 and the back support frame to move. 6 is fixed so that it cannot tilt, and the lock operation lever 17 is also returned to its original position by the action of the cam 19.

Therefore, the above operation can be easily performed by the user simply pulling the lock operation lever 17 and pressing the seat plate 29 or the backrest 30 while sitting on the chair. Conversely, when converting from a resting position to a working position, the coil spring 7 is connected to the seat frame 2.
9 is constantly pushed up, so if you pull the lock operation lever 17 while sitting and slightly lift your hips, the seat plate 29 and backrest 30 will work together and automatically tilt forward, allowing you to operate the lock. When the lever 17 is released, it is fixed by the action of the locking mechanism 20 in the same manner as described above.

Effects of the invention In the chair tilting device according to this invention, a spring is installed between the support frame and the seat frame pivotally connected thereto, and the spring elastically biases the seat frame toward the forward tilting side. The back support frame and the seat frame, which are pivotally connected at the ends, are connected via a link mechanism so as to interlock and tilt in the same direction, and a lock mechanism is provided to fix the back support frame and the seat frame to the support frame. By simply releasing the locking mechanism with a single touch, the user can easily adjust the working posture with the seat frame and backrest frame tilted forward and the rest position with both frames tilted backwards, all while sitting on the chair. The angles of the two frames in these two postures can also be arbitrarily selected. Furthermore, since this tilting device is mechanically extremely simple, it operates reliably, has little risk of failure, has excellent durability, and can be manufactured at low cost.

Furthermore, the link mechanism includes a first link whose upper end is pivotally connected to the rear end of the seat frame;
a rearwardly bent second link which is pivotally connected to the lower end of the link and whose other end is pivotally connected to the support frame at a position slightly forward of the pivot point at the upper end of the first link; and a front end which is a bent portion of the second link. and a downwardly curved third link whose rear end is pivotally connected to the lower part of the back support frame, the tilting operation between the seat frame and the back support frame can be performed with almost no frictional resistance. It can be done without. Moreover, since the second link is formed in a rearwardly bent shape and the third link pivotally connected to the bent part is formed in a backwardly curved shape, the link mechanism can be made compact and the seat frame can be easily integrated. The tilting movement with respect to the back support frame can be increased.

Further, the lock mechanism has one end pivotally connected to the seat frame and the back support frame, and the other end thereof is arranged in an overlapping state, and the lock mechanism has a length extending along the longitudinal direction drilled in the other end. The seat frame is composed of a pair of friction plates through which sliding pins fixed to the support frame are inserted, and a lock operation section that controls mutual pressing and release of the friction plates. and the back support frame are each reliably locked to the support frame. Furthermore, locking and unlocking can be performed with a single operation of the lock operation section. In addition, this lock mechanism is provided separately from the link mechanism, so
The load in the backward tilting direction applied to the seat frame and back support frame during use is not applied to the link mechanism. Therefore, it is not necessary to use a sturdy link mechanism with excellent strength, and manufacturing costs can be reduced, and the failure rate can be significantly reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the tilting device for a chair according to this invention. FIG. 1 is a perspective view of the tilting device in the working position, FIG. 2 is a left side view of the tilting device in the resting position, and FIG. 4 is a front view of the same, FIG. 5 is a cross-sectional view taken along the line A-A in FIG. is a cross-sectional view taken along line B-B in FIG. 5, FIG. 8 is a cross-sectional view taken along line C-C in FIG. 5, and FIGS. 9 and 10 are schematic left side views showing the operation of the lock mechanism. It is a diagram. DESCRIPTION OF SYMBOLS 1... Support frame, 2... Pillar, 4... Seat frame, 6... Back support frame, 8... Link mechanism, 8a... First link, 8b... Second link, 8c... Third link 3 links, 11, 12...friction plate, 11a, 12a...elongated hole, 14...sliding pin, 20...lock mechanism.

Claims (1)

[Claims for Utility Model Registration] Support frame 1 attached to the upper end of pedestal 2
A seat frame 4 is disposed on the support frame 1 and pivotally attached to the front part of the seat frame 4 so as to be tiltable forward and backward. A spring 7 for biasing the elastic force is attached, and a back support frame 6 is pivoted at its upper part to the rear of the support frame 1 so as to be tiltable back and forth, and the seat frame 4 and the back support frame 6 are linked. A tilting device for a chair, which is connected via a mechanism 8 so as to be interlocked in the same tilting direction, and further includes a locking mechanism 20 for fixing the back support frame 6 and the seat frame 4 to the support frame 1 in a fixed position. The link mechanism 8 includes a first link 8a whose upper end is pivotally connected to the rear end of the seat frame 4, and one end which is pivotally connected to the lower end of the first link 8a and the other end which is the upper end of the first link. A backward bent second link 8b is pivotally connected to the support frame 1 at a position slightly forward of the pivot point, and the front end is pivotally connected to the bent part of the second link 8b, and the rear end is connected to the back support frame 6. The locking mechanism 20 has one end pivotally connected to the seat frame 4 and the back support frame 6, and the other end pivotally connected to the seat frame 4 and the back support frame 6. Elongated holes 11a and 12 that extend along the longitudinal direction are arranged with their ends overlapped and bored in the other end.
It consists of a pair of friction plates 11 and 12 through which a sliding pin 14 fixed to the support frame 1 is inserted, and a lock operation section that controls the mutual pressing and release of the friction plates 11 and 12. A chair tilting device characterized by: