JPH0337465Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a device for adjusting the longitudinal inclination angle of the seat and backrest of a chair used for office use.

Conventional Technology In recent years, in chairs used for office work, etc., the front and back inclination angles of the seat and backrest have been made adjustable in order to suit the user's preferences and to switch between a working position and a resting position. things are widely used. Therefore, conventional methods of tilting the seat and backrest for adjusting the angle mentioned above include an integrated method in which both are tilted in an integrated manner;
An interlocking method in which one tilting operation causes the other to tilt in conjunction with the other, and an individual method in which both tilt individually are known.

Problems to be Solved by the Invention However, in the above-mentioned integrated system and interlocking system, the relative angle between the seat part and the backrest part is fixed, so there is a problem that the user's preference cannot be fully met. In addition, in the conventional configuration of the individual method described above, the angle adjustment mechanism is complicated and requires multi-step adjustment operations, and the manufacturing cost is high due to the large number of parts.Furthermore, the lock part that fixes the adjustment angle has poor reliability. There was a problem that the lock was easily released or the lock was not activated due to impact or the like.

This idea was made to solve the above problems.The relative angle between the seat and the backrest is variable, the structure is extremely simple, the number of parts is small, it can be manufactured at low cost, and it can be operated with one touch. To provide a chair inclination angle adjusting device which can adjust the angle at the same time, has a very reliable locking part, and has excellent reliability of operation.

Means for Solving the Problems In the chair inclination angle adjusting device according to the present invention, for the above purpose, the seat frame and the back support frame are pivotally connected to a support frame attached to the top of the pillar so as to be tiltable back and forth. At the same time, a plurality of fixed friction plates attached to the support frame and a plurality of movable friction plates pivotally attached to the back support frame are fitted alternately, and holes are formed in both friction plates at this sandwiched part. A shaft body consisting of an insertion pin part that communicates with the elongated hole and a guide shaft part coaxial with the shaft body is installed horizontally on the seat frame, and a press ring is slidably fitted into the guide shaft part. A lever handle shaft formed with a cam portion that contacts the pressing ring is fitted into the guide shaft portion in a direction orthogonal to the lever handle shaft, and a spring member is attached to the lever handle shaft to bias the cam portion toward the pressing side. The above-mentioned friction plates are pinched between the pressing ring pressed by the cam and the seat frame, and the seat frame and back support frame are fixed so that they cannot tilt, while the lever handle shaft is prevented from rotating in the circumferential direction. The seat frame and the back support frame are configured to be tiltable as the pressure on the cam portion is released by operation.

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

In Figs. 1 and 2, 1 is a pillar configured to be able to rise and fall using a built-in gas spring (not shown);
2 is a support frame attached to the top of pedestal 1;
Reference numeral 3 denotes a seat frame pivotally connected to the front part of the support frame 2, and 4 a back support frame arranged below the seat frame 2 and pivotally connected to the support frame 2 coaxially with the seat frame 3. , each frame 2, 3,
4 is made of aluminum die-casting or the like.

The support frame 2 has disk portions 2b, 2b extending along a vertical plane integrally formed at both ends of a front portion projecting to the left and right of a horizontal substrate portion 2a having a substantially T-shape in plan view, and both disk portions 2b, 2b. Rib 2 in the left and right direction spanning between 2b
c and two longitudinal ribs 2d are provided in parallel on the upper and lower surfaces of the horizontal base plate 2a, and the longitudinal ribs 2d...the rear ends of the longitudinal ribs 2d protrude rearward than the base plate 2a and are opposed to each other in the left-right direction. side walls 2e, 2e. A circular hole 5 is formed in the horizontal base plate 2a at an intermediate position in the left-right direction on the rear side of the support frame 2, and the circular hole 5 is sandwiched from both front and rear sides to form a U-shaped installation that opens downward when viewed from the side. A frame portion 2f is integrally formed, and by fitting the slightly tapered top portion 1a of the pedestal 1 into the inside of this mounting frame portion 2f, the support frame 2 is attached to the pedestal 1 so as to be rotatable in a horizontal plane. . In addition, the disk portion 2b of the frame 2 used,
2b, there is a pivot shaft 6 on the lower surface side of the base plate part 2a.
has been erected.

The seat frame 3 is configured in a substantially U-shape with an open front in plan view, and left and right side walls 3a, 3a forming a slight opening angle toward the front side are connected to a center base plate portion 3b and a rear end wall portion 3.
c, a boat-shaped projecting portion 3d is integrally formed outward from the upper part of each side wall portion 3a, and a mounting wall portion 3e extending in the front-rear direction between the central board portion 3b and the rear end wall portion 3c. is formed. Thus, the seat frame 3 is pivotally attached to the support frame 2 so as to be tiltable back and forth by passing the pivot shaft 6 through the front portions of the left and right side walls 3a, 3a on both sides.

The back support frame 4 has a front part that slopes slightly forward, a rear part that has a dovetail shape, and a boat shape that becomes wider in the left and right direction toward the front. By passing both ends of the pivot shaft 6 through the left and right side walls 4b, 4b with the pillar inserted through the opening 7, the support frame 2 is pivoted coaxially with the seat frame 3 so as to be tiltable back and forth. It is worn. The back support frame 4 is biased toward the forward tilt side by an octopus spring 8 wound around the front right side of the support frame 2.

On the other hand, as shown in FIGS. 3 and 4, on both side walls 2e and 2e of the rear portion of the support frame 2, pin receiving portions 9 consisting of recesses opening upwardly and inwardly are provided at opposing positions in the upper part. A pin fixing part 10 consisting of a recess that opens downwardly and inwardly is formed on one side of the lower facing position directly below these, and a notch-shaped pin insertion that opens outwardly and outwardly and downwardly on the other side. A portion 11 is formed. In addition, 12 is a pin hole 1 at the top and bottom positions of the mounting side end.
2a, 12b, the plurality of these plates fit and lock both ends of the pin 13 communicating with the upper pin holes 12a, . . . into the pin receiving parts 9, 9, and the lower The pins 14 are inserted through the pin insertion portions 11 into the pin holes 12b, and their tips are engaged with the pin fixing portions 10, thereby attaching the pins 14 to the support frame 2 so as to protrude rearward. The pin 14 has a snap spring 15 fitted in its circumferential groove 14a to prevent it from coming off, and each fixed friction plate 1
2 is provided with a long hole 12c on its protruding end side, which extends in the circumferential direction around the pivot shaft 6 in the above-mentioned mounted state.

Further, in the middle part of the back support frame 4, a plurality of substantially rectangular movable friction plates 17 are rotatably pivoted on the lower end side in a vertical plane via a pivot shaft 16 installed between both side wall parts 4b, 4b. each movable friction plate 17
is provided with a long hole 17a along its longitudinal direction.

Therefore, the rear side of the fixed friction plates 12... and the upper side of the movable friction plates 17... are alternately sandwiched, and as shown in FIG. 5, the seat frame 3 is attached at this sandwiched portion. A horizontal pin portion 18a consisting of a bolt supported at one end by the wall portion 3e connects to both elongated holes 12.
It communicates with c... and 17a.... Further, the horizontal pin portion 18a is the left side wall portion 3a of the seat frame 3.
It is screwed coaxially to the tip of the guide shaft portion 18b cut off on the inner surface to constitute an integral shaft body 18,
A press ring 19 is slidably fitted into this guide shaft portion 18b. Further, an L-shaped lock handle 20 is attached to the seat frame 3 by extending a shaft portion 20a in the front-rear direction between the base plate portion 3b and the rear end wall portion 3c, and the shaft portion 20a is connected to the guide shaft portion 18b. It is perforated in the orthogonal direction so as to be freely rotatable in the circumferential direction. As shown in FIG. They abut along the radial direction. Further, the locking lever handle 20 is biased by an octopus spring 22 attached to the shaft 20a so that the shaft 20b protruding laterally rotates downward. 2
1 is arranged so as to press the press ring 19 toward the friction plates 12, 17, and both friction plates 12... and 17...
... is pressed between the inner end surface of the press ring 19 and the mounting wall 3e of the seat frame 3.

In addition, 23 is a lever handle for raising and lowering, and by pulling up and operating this, the tip of the lever handle is moved to the pillar 1.
A gas spring operating protrusion 24 protruding from the top end surface of the
Push in to enable the pillar 1 to move up and down. 25 again
is a backrest support, and a bolt 26 passing through the lower end thereof is made to protrude rearward from a long hole 27 in the vertical direction bored in the rear end wall 4c of the back support frame 4, and a dial handle 28 is screwed into this protrusion. As a result, it is attached to the back support frame 4 so that its height can be adjusted within the range of the elongated hole 27. Reference numeral 29 denotes a seat body attached to the seat frame 3.

In the chair configured as described above, when the locking lever handle 20 is not operated, both the friction plates 12 . . . and 17 .
Since the seat frame 3 and the back support frame 4 are pressed against each other so as not to be slid relative to each other, both the seat frame 3 and the back support frame 4 are fixed to the support frame 2 so as not to be able to tilt vertically. By pulling up the locking lever handle 20, the shaft portion 20a rotates and the cam portion 21 is rotated.
is arranged on the relaxed side as shown in FIG. The long hole 1 of the friction plate 12 is connected to the support frame 2.
The back support frame 4 can be tilted back and forth within a range of 2c, and the back support frame 4 has a friction plate 17 against the seat frame 3.
It is possible to tilt back and forth within the range of the elongated hole 17a.

Here, since the back support frame 4 is biased forward by the octopus spring 8, when the user pulls the locking lever handle 20 while sitting on the chair and lifts the waist, the back support The frame 4 tilts forward, and then, as shown in FIG. 9, with the horizontal pin part 18a positioned at the lower end of the elongated hole 17a of the friction plate 17, the seat frame 3 is also pushed up by the back support frame 4 and tilts forward as a unit. do. FIG. 10 shows a state in which both frames 3 and 4 are tilted most forward. Therefore, if the user applies pressure to the seat frame 3 and back support frame 4 with his hips and back and sets both frames 3 and 4 to the desired inclination angle, then he simply releases the lever handle 20. Due to the action of the tacho spring 22, both friction plates 12... and 17... are automatically pressed into a locked state, and both frames 3, 4 are fixed at the set inclination angle.

Therefore, in the above configuration, the seat frame 3 and the back support frame 4 are fixed to both the friction plates 12... and 17.
Because the pressure welding is done over a wide area, the fixing force is extremely large. Furthermore, while it is structurally easy to displace the cam part 21 and push the press ring 19 by operating the locking lever handle 20, it is difficult to displace the cam part 21 from the press ring 19 side. Since this requires an extremely large force, there is no concern that the fixing force in the locked state will loosen even if an impact or the like is applied to the seat frame 3 or the back support frame 4. In addition, since the conversion between the locked state and the unlocked state is performed only by the rotational displacement of the cam portion 21 and the movement of the press ring 19, the mechanism is extremely simple, the operation is reliable, and failures are unlikely to occur. This has the advantage that the entire angle adjustment device has a small number of parts and can be manufactured at low cost.

Furthermore, in the above implementation configuration, the fixed friction plate 12 is attached to the support frame 2 so that it cannot move up and down only by engaging the pins 13 and 14, and there is no need for screwing at all, so the attachment operation is very easy. be.

In the above embodiment, the seat frame 3 and the back support frame 4 are coaxially connected to the support frame 2, but in this invention, both frames 3 and 4 may be pivotally connected at different positions. . In addition, pin receiving portions 9 formed on both side walls 2e, 2e of the support frame 2,
9, the pin insertion part 11, and the pin fixing part 10 may have the vertical positional relationship reversed. Furthermore, the pin receiving part 9
It is also possible to form a notch opening on the inner and outer surfaces of the side wall 2e, provided that the pin 13 fitted thereon is prevented from coming off with a snap spring or the like. Further, the pin insertion part 11 may have a hole shape instead of a notch shape, and the pin fixing part 10 can also have a notch shape or a hole shape similar to the pin insertion part 11.

Effects of the invention The chair inclination angle adjustment device according to this invention can steplessly adjust the longitudinal inclination angle of the seat frame and the back support frame with a single touch operation, and the relative angle of both frames can also be varied. The fixing force of both of the frames mentioned above is extremely large, and this fixing force will not loosen due to shocks, etc., and the overall adjustment mechanism has a small number of parts and is extremely simple in structure, so there is no risk of failure. It has the excellent advantages of high operational reliability and low cost manufacturing.

[Brief explanation of drawings]

The drawings show an embodiment of the inclination angle adjustment device for a chair according to the present invention, in which FIG. 1 is an overall plan view, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. The figure is a cross-sectional view taken along the - line in Figure 1, Figure 4 is an exploded perspective view of the fixed friction plate installation part, and Figure 5 is a cross-sectional view taken along the - line in Figure 1.
The figure is a cross-sectional view taken along the - line in Figure 1, Figure 6 is a longitudinal sectional side view of the main parts in the unlocked state, Figure 7 is a perspective view of the cam part of the locking lever handle, and Figure 8 is the overall view. The left side view, FIGS. 9 and 10 are vertical left side views showing the operating state. 1... Pillar, 1a... Top, 2... Support frame, 2e... Side wall, 3... Seat frame, 4...
Back support frame, 9... Pin receiving part, 10... Pin fixing part, 11... Pin insertion part, 12... Fixed friction plate, 12a, 12b... Pin hole, 12c... Elongated hole, 13, 14... ...Pin, 16...Axis, 17...
...Movable friction plate, 17a... Long hole, 18... Shaft body,
18a...Horizontal pin part, 18b...Guide shaft part,
19...Press ring, 20...Lock lever handle, 20a...Shaft portion, 21...Cam portion, 22
... Octopus spring (spring member).

Claims (1)

[Claims for Utility Model Registration] (1) A seat frame and a back support frame are pivotally attached to a support frame attached to the top of the pillar so as to be tiltable back and forth, and a plurality of fixed friction plates attached to the support frame The plate and a plurality of movable friction plates pivotally attached to the back support frame are alternately sandwiched together, and at this sandwiched part, an insertion pin part communicating with the elongated hole drilled in both friction plates and coaxial therewith. A lever handle shaft is provided with a shaft body horizontally installed on a seat frame, and a pressure ring is slidably fitted on the guide shaft part, and a cam part is formed to abut the pressure ring. is inserted through the guide shaft in the orthogonal direction, and a spring member is attached to the lever handle shaft to bias the cam part toward the pressing side, and the pressing ring pressed by the cam part and the seat frame are connected to each other. The above-mentioned friction plates are compressed between the seat frame and the back support frame so that they cannot be tilted.
A chair inclination angle adjusting device configured such that a seat frame and a back support frame can be tilted when a pressure on a cam part is released by rotating a lever handle shaft in a circumferential direction. (2) The support frame has side walls arranged opposite to each other in the left and right direction, a pin receiving part is formed at one opposing position on the upper and lower parts of both side walls, and a pin insertion part and a pin fixing part are formed at the other opposing position, Pin holes are drilled at the top and bottom positions of the mounting side end of the fixed friction plate, and both ends of the pin inserted into one pin hole are fitted and locked in the pin receiver, and the pin is inserted into the other pin hole. 2. The inclination angle adjusting device for a chair according to claim 1, wherein the fixed friction plate is attached to the support frame by inserting a pin through the pin and locking its tip to the pin fixing portion.