JPH0337466Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to an improvement in a vertical adjustment device that can arbitrarily adjust the vertical height of a back plate of a chair.

B. Prior Art Various types of devices for vertically adjusting the back plate, which is the backrest of a conventional chair, have been provided.
For example, in Utility Model Application Publication No. 162759 of 1981, a suspension rod that is pivoted in a pendulum shape on a support rod and has a plurality of engagement recesses arranged in a row is biased by a spring and attached to a back plate. An adjustment device is disclosed that allows the height of the backplate to be adjusted by engaging a fixed mounting piece. In this case, when assembling and setting the suspension rod, the mounting piece of the back plate and the support rod are fitted and held at an appropriate height position, and the suspension rod is fixed by pivoting, and the lower end of the suspension rod and the support rod are fixed. It is necessary to connect the rods at the appropriate positions and fix the springs in a tensioned state, which requires a very labor-intensive work process in assembling this chair, which causes an increase in costs.

C. Problems to be solved by the invention In view of the above-mentioned situation, the present invention provides an adjustment device with a simple structure that locks the back plate to a predetermined height and allows vertical movement of the back plate and the backrest rod. to facilitate assembly of the device;
To provide a vertical adjustment device for a back plate of a chair, which achieves cost reduction and can securely maintain the vertical position depending on the type of the backrest rod of the chair.

D. Means for Solving the Problems In order to solve the above-mentioned problems, the present invention fixes a support member that can be fitted internally or externally to the upper end of the backrest rod of the chair in a vertically slidable manner to the back of the backboard. , a position adjustment opening having a plurality of locking grooves spaced apart on one side is provided above and below the center of either the backrest rod or the support member, and the other of the backrest rod or the support member is provided with a position adjustment opening,
A plate-like operating rod that is loosely inserted into the backrest rod or support pieces protruding from both left and right sides of the support member to be movable in the left and right direction, is large enough to be locked in the appropriate position in the center of the locking groove. a U-shaped notch is provided at an appropriate position at the base end of the operating lever on the side where the locking groove is provided, and the tip thereof forms a protruding shaft directed toward the tip of the operating lever; The protruding shaft is equipped with a coil spring whose one end abuts the support piece, and the operating rod is biased toward the proximal end, thereby constructing a device for vertically adjusting the back plate of the chair.

E. Embodiments Next, the present invention will be further explained in detail based on embodiments shown in the accompanying drawings.

Figures 1 and 2 show typical embodiments of the present invention in which the backrest rod is fitted into the backrest so that it can slide vertically by means of a support member fixed to the backside of the backboard, where A is the backboard and B is the backrest. C indicates a support member, D indicates a position adjustment opening, and E indicates an operating lever. The back plate A is
Like a normal back plate, a cushion material 2 is attached to the front surface of a back plate base plate 1, and holes for fixing support members C, which will be described later, are provided at predetermined positions. The backrest rod B is a rod with a flat groove-shaped cross section that is attached to the seat plate or the legs of the chair and protrudes upward from the back of the chair. A position adjustment opening D is provided in which the locking grooves 3, . . . are spaced apart on one side, and the locking grooves 3,...
. . . Upper and lower notched long grooves 4 or elongated holes are formed at predetermined positions on the side wall on the side where the ... is provided. The support member C, which is fixed to the back surface of the back plate A with screws 5, etc., is used to maintain the back plate A and the backrest rod B in a vertically slidable relationship, as shown in the figure. In order to fit the backrest rod B inside, it has a flat groove-shaped cross section with an inner width and height that is approximately the same as or slightly larger than the backrest rod B, and the leading edges of both sides of the groove are bent inwardly. Then, vertical holding pieces 6, 6 are formed so that the backrest rod B can be fitted inside the backrest rod B. At this time, support members C are attached at two upper and lower places on both sides of the upper end of the backrest rod B, as shown in FIG. A slider 7 made of synthetic resin or the like is provided with a size that regulates the distance between the left and right front and back when fitted with the backrest rod B, to improve slippage when sliding in the vertical direction and to prevent rattling in the left and right direction. It is prevented.
The operating rod E is a plate-shaped member that is set inside the backrest rod B in the transverse direction to the support member C and the backrest rod B fitted therein, and has a base end in the longitudinal direction. A cap made of synthetic resin or the like is attached to 8 to form an operating part 10, and a screw hole 11 is provided at a predetermined position in the longitudinal center for fixing a pin 9 of a size that can be engaged with the locking groove 3. A U-shaped notch is formed at a suitable location on the base end 8, and the tip thereof forms a protruding shaft 12 directed toward the distal end of the operating lever E, so that the operating lever can be attached to the base end 8.
This serves as a mounting shaft for a coil spring 13 for biasing the spring in the direction. In order to support the operating rod E on the support member C so as to be movable in the left and right direction, support pieces 14, 14 are provided on the inner surface of the support member C so as to protrude from both left and right sides at appropriate intervals. Support holes 15, 15 into which the operating rod E can be loosely inserted are provided to support the operating rod so that it can move laterally. Here, the diameter of the tip of the coil spring 13 is large enough not to pass through the support hole 15 of the support piece 14, and when the pin 9 is locked with the lock groove 3 as shown in FIG. The length of the coil spring 13 attached to the protruding shaft 12 is set so that the tip thereof at least comes into contact with the support piece 14 on the base end side of the operating rod. In addition, in order to make it possible to insert this operating rod E from the side of the side where the locking grooves 3, . . . of the backrest rod B fitted inside the supporting member C are provided, a An opening 16 that communicates with the support holes 15, 15 and is large enough to allow insertion of the operating portion 10 from the tip of the operating rod E to which the coil spring 13 is attached.
In addition, the notch long groove 4 of the backrest rod B is provided.
is wide enough to communicate with the opening 16, and with the pin 9 of the operating rod E protruding within the position adjustment opening D, the backrest rod B can be moved up and down in the range between the upper and lower sides of the position adjustment opening D. It is set at a height that allows it to be moved. The length of the operating lever E here is the third
As shown in the figure, a length is set so that the operating part 10 projects outward from the opening 16 by at least the length of the pin 9 when it is engaged and disengaged when the pin 9 is engaged with the engagement groove 3.
In this embodiment, as shown in FIGS. 2 and 3, the portion of the backrest lever B where the opening D for position adjustment is provided is recessed inward by a required amount, and the operating rod E and the opening D for adjusting the position are recessed inward. D, and the concave depression 17
The tips of the support pieces 14, 14 are accommodated in the spaces 18, 18 on both sides, and the height of the pin 9 protruding into the opening D for position adjustment is kept as low as possible, so that the pin 9 can be held when the height of the back plate A is locked. This prevents as much as possible the generation of rotational force acting on the operating rod E through the shaft. When attaching the support member C to the back surface of the back plate A, similarly, the portion of the support member C to which the screws 5, . At the same time, the screws 5,...
The head is housed behind the protrusion 19 to remove the influence of the screw head as a protrusion from the inner surface of the support member C. The exterior cover indicated by 20 in the figure prevents the intrusion of dust, dirt, etc. and improves the appearance performance.

Therefore, in assembling this vertical adjustment device, first, the support member C provided with the support pieces 14, 14 is fixed to the back surface of the back plate A with screws, and then the support member C
The backrest rod B is inserted from below, the position adjustment opening D is positioned near the support piece 14, the backplate A is temporarily held, and the operating rod E, which has the coil spring 13 mounted on the protruding shaft 12, is attached to the support member. The coil spring 13 is inserted through the opening 16 and the notched long groove 4 from the C side, and after the tip of the coil spring 13 comes into contact with the front support piece 14, the operating part 10 is further pressed slightly to compress the coil spring and both support pieces 1 are inserted.
4 and 14, and insert the pin 9 into the position adjustment opening D from behind the backrest rod B.
When the pin 9 is inserted into the threaded hole 11 of the operating lever E and the pressure applied to the operating part 10 is released, the pin 9 is pushed into one of the locking grooves 3 by the restoring force of the compressed coil spring 13. The assembly is completed by locking it. That is, attaching the support member C to the back surface of the back plate A, fitting the upper end of the backrest rod B into the support member C,
Inserting the operating rod E equipped with the coil spring 13,
The assembly is completed with extremely few steps of attaching the pin 9 to the operating lever E and simple and easy operations.In particular, a protruding shaft 12 is provided on the proximal end of the operating lever E to move the pin 9 in the locking direction. By making this the mounting location for the coil spring 13 that biases the spring, it is possible to simultaneously bias the spring in the locking direction of the pin 9 by simply inserting the operating lever E, which simplifies and facilitates assembly work. be.

If you want to change the height of the back plate A, press the operating part 10 of the operating lever E, and the pin 9 will move to the operating lever E.
It moves in the direction of the tip, that is, in the opposite direction to the locking direction to the locking groove 3, and can move up and down in the position adjustment opening D, so the back plate A can also move up and down, and the desired vertical locking can be performed. When the pressure applied to the operating part 10 is released at the locking groove 3 position, the operating rod E moves toward its base end due to the restoring force of the coil spring 13, and the pin 9 automatically locks with the locking groove 3. and hold the back plate A again at the desired height.

Next, FIG. 4 shows another embodiment having a configuration opposite to that of the embodiments described above.

That is, instead of the structure in which the backrest rod is slidably fitted up and down by the support member fixed to the back surface of the back plate in the embodiments described above, the support member C' fixed to the back surface of the back board is inserted into the back seat so that it can slide vertically. This is an embodiment in which the leaning rod B' is fitted onto the outside. In this case,
Basically, the only difference is whether the fitting relationship between the support member fixed to the back of the back plate and the backrest rod is internal or external, and the attachment of the operating rod changes from the support member to the backrest rod. , opening for position adjustment in support member C′
D', notch long groove 4' and slider 7',...
At the same time, a retaining piece 6' is attached to the backrest rod B'.
6', support pieces 14', 14' for the interior of the operating lever E, an opening 16', and a mounting hole 21 for screwing in the pin 9.

F. Effects of the invention According to the chair backboard vertical adjustment device of the invention,
A supporting member that can be slidably fitted in or out of the upper end of the backrest rod of the chair is fixed to the back of the backboard, and above and below the center of either the backrest rod or the supporting member,
A support piece is provided with a position adjustment opening having a plurality of locking grooves spaced apart on one side, and is provided on the other side of the backrest rod or support member and protrudes rearward from both left and right sides of the backrest rod or support member. A pin of a size that can be engaged with the locking groove is erected and attached to an appropriate position in the center of a plate-shaped operating rod that is loosely inserted into the plate and can be moved in the left and right directions, and the locking groove is locked. Since the back plate is biased by a spring in the direction, the back plate can be reliably and easily moved to a desired vertical position and locked even in different fitting relationships with the backrest rod. A U-shaped notch is provided at an appropriate location on the proximal end of the rod on the side where the locking groove is provided, the tip of which forms a protruding shaft directed toward the tip of the operating rod, and one end of the protruding shaft contacts the support piece. Since the device is configured to have a coil spring attached to the exterior and bias the operating rod in the proximal direction, when assembling this vertical adjustment device, simply insert the operating rod with the coil spring attached to the front and attach the pin. Since the installation of the pin and the spring biasing of the pin in the locking direction can be completed at the same time, the assembly process can be omitted and made easier, reducing costs, and the simplification of the configuration increases reliability for continued use. We can also expect an improvement in

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a chair to which an embodiment of the present invention is applied; Fig. 2 is an exploded perspective view of the essential parts of the invention in Fig. 1; Fig. 3 is a cross-sectional view of Fig. 2 when assembled; FIG. 4 is an exploded perspective view showing another embodiment of the present invention. A... Back plate, B... Backrest rod, C... Supporting member, D... Opening for position adjustment, 1... Back plate substrate, 2
...Cushion material, 3...Latching groove, 4...Notch long groove, 5...Screw, 6...Holding piece, 7...Slider, 8...Base end, 9...Pin, 10... Operation unit, 11...screw hole, 12...protruding shaft, 13...
Coil spring, 14... Support piece, 15... Support hole,
16...Opening, 17...Concave depression, 18...Vacancy, 19...Protrusion, 20...Exterior cover, 21
...Mounting hole.

Claims (1)

[Scope of utility model registration request] A support member that can be slidably fitted in or out of the upper end of the backrest rod of the chair is fixed to the back of the backboard, and a plurality of locking recesses are provided at the top and bottom of the center of either the backrest rod or the support member. A position adjustment opening with a groove spaced apart on one side is provided, and the other side of the backrest rod or support member is loosely inserted into a support piece protruding from both left and right sides of the backrest rod or support member. A pin of a size that can be engaged with the locking groove is installed in an upright position in the center of a plate-shaped operating rod that is movable in a direction, and a pin of a size that can be locked with the locking groove is installed on the side of the operating rod where the locking groove is provided. A U-shaped notch is provided at a suitable location on the base end, the tip of which forms a protruding shaft pointing toward the distal end of the operating rod, and the protruding shaft is covered with a coil spring whose one end abuts the support piece to move the operating rod toward the proximal end. A device for vertically adjusting the back plate of a chair, which is biased by a spring.