FI72865C - Device for control and locking of seat backrest. - Google Patents

Description

72865

DEVICE FOR ADJUSTING AND LOCKING THE SEAT BACK

The invention relates to a device for adjusting and locking a seat backrest, the seat part and the back part 5 of which are articulated to each other and the backrest to a chair frame or the like, and which seat part rests on the seat frame and the seat backrest can be adjusted and locked as desired.

10 Numerous seats are already known, in particular recliners with an adjustable backrest position. An adjustable recliner is disclosed, for example, in Finnish patent publication 20 829, in which a spring device and a saw mechanism are arranged between the seat part and the backrest, which prevents the backrest from turning upwards by the spring device, but allows the backrest to be turned backwards by the spring device. Such adjusting and locking devices must be attached to the frame of the seat and back of the chair before upholstery. Maintenance and repair are 20 mm. due to the covering upholstery. In addition, the devices are relatively complex in structure and expensive to manufacture.

It is an object of the present invention to provide a simple and reliable device for adjusting and locking a seat back. This is achieved by the features of the invention set out in the appended claims.

The advantages of the device according to the invention are e.g. simple structure so. it has few separate parts, so it is inexpensive to manufacture. The device can be used in both unupholstered and upholstered seats; the device is mounted invisible under the seat part and most preferably on any upholstery or on the outside 1 e. Installation of the device 2 72865 also does not make it difficult to upholster, as all its parts are parts outside the upholstery. The seat height can be pi-t85 as a standard regardless of the inclination of the backrest, in which case the device can be used on sofas where separate and rin-5 leaning seats can be s8St88 either separately or together. The height of movement of the seat part in the height direction can be selected by changing the shape of the guide to be installed below the seat part. The adjustment and locking of the seat backrest is easy to perform with the lever associated with the device, because the lever 10 is well at hand even when the backrest is almost in the supine position and because the required lever adjustment movement is relatively small.

An important advantage of the device 15 according to the invention for the furniture designer is that the designer has a free hand in terms of design. The device requires little space, can be easily installed in an otherwise finished seat and can be used in seat structures without side pieces such as armrests. In addition, the seat 20 can be delivered in parts to the consumer, since the adjustment and locking device does not make it very difficult to assemble the seat.

The invention will now be described in detail with reference to the accompanying drawings, in which: Figure 1 shows a recliner provided with a device according to the invention, the back of which is in two adjustment positions: in the vertical position 1A and in the rest position 1B;

Fig. 2 is a side view of Fig. 1 showing a device according to the invention attached to an armchair 30 in a partial sectional view;

Figure 3A shows from above and

Figure 3B is an exploded front view of essential parts of a device according to the invention; Fig. 4 shows a guide to be connected to the lower surface of the seat part, which in Fig. 4A is curved and 4B is corrugated.

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The recliner of Figure 1 comprises a seat part 9, a backrest 10 and a frame 11. The frame 11 consists of two parts on both sides of the seat part and the backrest, i.e. interlocking legs 13 and armrests 14 connected to each other by a front support 12. The seat part 9 and the backrest 10 are articulated to each other so that they turn relative to each other. The backrest 10 is pivotally attached at its edges to the frame 11 above the seat part and the backrest articulation point 20 at the attachment point 21. The seat part 9 rests freely on the frame 11, in this embodiment the front support 12 of the frame, so that it can be moved forwards and backwards. A device for adjusting and locking the backrest on the seat is attached between the frame 11 and the seat part 9.

15

The device according to the invention for adjusting and locking the seat backrest comprises, as shown in Fig. 2, a guide 1, a locking part 2 and a locking member 3. The guide • 1 is an elongate member attached at its first end 20 to the seat part 9. The second end Ib is free. The locking part 2 of the device has an opening 5, a groove or the like into which the guide 1 is fitted. The lock part 2 is attached to the is-; to the body of the support, such as the front support 12 of the body, or to a part integral with the body. The locking member 3 is connected to the locking member 2 by means of threads so that by rotating the locking member 3 in parallel, the guide 1 can be released to move in the opening 5 of the locking member and the seat member 9 and backrest 10 are released by turning in the direction, the guide 1 can be locked again in the opening 5 of the lock part and with it the seat part 9 and the backrest 10 in place.

The guide 1 can be, for example, round, el-33 Lip, square or flat rectangle in cross section. The length of the guide is determined according to the structure of the seat, so that the guide 1 remains in the opening 5 of the lock part and can move in this opening 5 when the inclination of the backrest is adjusted within predetermined limits. The first end 1a of the guide 1 is fixed to the seat part 9 so that the guide can move at least vertically with respect to the seat part and follow the movements of the seat part. Thus, the guide can be articulated, e.g. by means of a pin 1 to the seat part 22. The guide 1 can have either a straight shape, as shown in Figures 1 10 and 2, or a curved member. In some cases, the straight guide may touch the seat substructures, which can be avoided when using a curved guide.

The locking part 2 can advantageously be realized in such a way that a hole 6 with internal threads 7 is arranged at least approximately perpendicularly to the opening 5 in the opening. A locking member 3 with corresponding external threads 8 is arranged in the hole 6. are preferably relatively steep, so that by turning the locking member 3 20 at most half a turn, the guide 1 can be locked in or released from the opening 5 of the locking part 2.

The pitch of the threads 7, 8 can be, for example, between 0.5 and Λ mm, whereby the rotation of the quarter turn of the locking member 3 causes a displacement of the locking member of 0.12 to 1 mm relative to the locking part 2, i.e. a corresponding constriction of the opening 5. The arrangement of the guide 1 and the opening 5 of the locking part is in accordance with this transition so that the guide 1 wedges into place in the opening 5 of the locking part 2 by means of the locking member 3. The end of the locking member 3 connected to the locking part 2 can be roughened or provided with a separate piece , by means of which the opening 5 can be throttled effectively and e.g. the friction surface between the guide 1 and the opening 5 can be increased.

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The opening 5 of the lock part 2 is so conical that it is narrower in at least one direction from the center than from the front and / or rear surface of the lock part, as can be seen from Fig. 2. The conical shape in the vertical direction, i.e. in a plane perpendicular to the seat part 5, ensures that the guide 1 can experience the movements of the seat part 9. If the opening 5 is also horizontally conical, i.e. the opening 5 and the guide 1 are tightly fitted to each other only from a relatively narrow area, the device according to the invention is easy to mount in place on the seat. In this case, the guide .1 does not have to be fitted directly against the locking part 2, but the installation can be carried out in a looser frame, e.g. 5 ° to 15e.

The lock part 2 is most preferably made of a single piece of metal of regular or circular shape, such as a rectangle, square or polygon, with an opening 5 for the guide 1 machined in the middle part (cf. Figs. 3A and 3B). Transversely, preferably perpendicularly or almost perpendicularly, to the opening 5 and in particular to its narrowest point 20, a hole 6 is drilled in which threads 7 are milled. The locking part 2 is provided with holes 23 so that it can be fastened to the seat frame with screws. Of course, the lock part 2 can also be made in other ways, e.g. from separate sleeves with an opening 5 and which 25 is connected to the body of the lock part.

In the exemplary embodiment of Figure 1, the lock part 2 is fixed to the front support 12 of the seat frame. The support is further provided with a hole 15 so that the guide 1 can be introduced into the opening 5 of the lock part 2 without obstruction.

The guide 1 can be attached not only to the front edge of the seat part 9 of the seat, such as in the recliner of Fig. 1, but also to its central part or elsewhere in the seat part. The selected attachment point depends on the structure of the wood seat and e.g. where 6 72865 the frame lock part 2 can be attached. There are many options for attaching both the guide 1 and the locking part 2 to the seat.

The locking member 3 is preferably a straight rod of the desired length, the first end of which has a thread 8, as shown in Fig. 3. The locking member 3 can be connected to e.g. a lever 4 at an angle to the actual locking member 3. By turning the lever 4, the locking member 3 is made to rotate.

10

Between the seat part 9 and the frame 11 or the like such as the front support 12, an abrasion friction reducing member, e.g. a roller or slide 16 or a sliding guide 17, can be placed. One or more slides, e.g. nylon, are attached to the seat part at suitable points in the seat part and between the hull. The sliding guide 17 or guides are attached to the lower surface of the seat part 9 at points corresponding to the slides 16 or, if the sliders are not used, e.g. at a distance from each edge of the seat part 9.

The guide 17 is preferably a relatively narrow elongate member made of a slippery hard material such as steel. The length of the guide 17 is such that the seat part 9 and the backrest 10, respectively, can be moved on it within the limits of the adjustment range.

25

The guide 17 may be a longitudinally straight member as shown in Figure 2. On the other hand, the guide 17 may be curved in shape so that the guide rises from the front edge of the seat portion toward the rear edge, as shown in Fig. 4A. The advantage of such a guide 30 is that the seat height remains constant even when the backrest is at a slight angle or almost lying down. The rear edge 17a of the guide 17 then suitably raises the front edge of the seat part 9.

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The conductor 17 may also be wavy as shown in Figure 4B. By means of the corrugated guide, a soft-step adjustment of the seat position can be realized. By means of the adjustment and locking device according to the invention, limits can be set for forward and rearward movements of the seat part and at the same time for the inclination adjustment range. This can be done in two ways: the stops for stopping the movement of the seat part 9 can be placed 10 in connection with either the guide 1 and / or the guide 17.

In connection with the guide 1, the stops 18 are individual members which can be placed at the first end 1a and / or the second 1b of the guide in the desired number. They can be, for example, annular in shape, as shown in Fig. 2, but they can be e.g. sleeves, pins, etc. The seat adjustment is determined by the free guide arm between the stops 18 of the guide 1 and / or e.g. the attachment point 22 of the first end 1a. .

20

Either end or both of the guide 17 can also alternatively be provided with a stop member 1, i.e. a stopper 1a. The forward or rearward movement of the seat part of the seat then stops at such a stopper.

25

The invention has been described above mainly applied to an armchair, but it is clear that it can also be used in other adjustable seats, e.g. chairs, armchairs, auditorium chairs, 1 epic sofas, sofa beds and 30 garden seats, 35

Claims (10)

1. Device for controlling and sewing the backrest on a chair, on which chair the seat part and backrest are hinged at each other and the backrest on the chair's body or counterpart and which seat part (9) rests on the chair body (11) and on which chair the inclination of the backrest can be controlled and the backrest is leased in the desired position by means of the device, characterized in that the device comprises a guide (1), a locking member (2) and a locking element (3), in which the device the guide (1) comprises of an elongate member, said member is secured with a first end (1a) to the seat portion (9) and the second end (1b) of the guide (1) is free; in which device the housing part (2) has an opening (5) or the corresponding, in which the guide (1) is fitted and the housing part (2) is attached to the chair body or a part connected thereto; and which auxiliary element (3) is joined to the auxiliary member (2) by means of threads (7, 8) so that the guide (1) can be released in one direction by rotating the auxiliary element (3) in the opening ( 3) in the shaft part and with this the seat part (9) and the backrest (10) can be set which can be adjusted in the desired position, after which the guide (1) can be locked in the opening (5) by rotating the shaft element (3) in the opposite direction. in the part and in its position. 25 2. Device according to claim 1, characterized in that the housing part (2) has a shark (6) with threads (7) at least perpendicular to the opening (5) and in this case (6) it is provided with threads. (8) provided with the locking element (3) and these threads advantageously have a relatively steep incline, so that the guide (1) can be loaded into the opening (5) in the locking part (2) or released from it by turning the locking element (3) at most a half lap. 35 72865 3. Apparatus according to claim 2, characterized in that the locking element (3) heats a lever (A), wherein the locking element (3) is rotated to rotate through the rotation of the lever. 5 4. Apparatus according to claim 2 or 3, characterized in that the opening (5) in the welding part (2) is tapered in such a way that the at least L one direction is narrower at the middle and at the front and / or rear of the welding part. 10 yt a. 5. Device according to claim 2, 3 cl. 1 or 4, characterized in that the welding part (2) is fixed to a front support (12) in the chair body, which support 1 is provided with a shelf (15) for the guide (1). Apparatus according to any of the preceding paterite claims, characterized in that a member (16; 17) which reduces the sliding friction is placed between the seat part (9) and the body or the corresponding (II). 7. Device according to claim 6, characterized in that on the lower surface of the seat part (9) there is provided at least one elongated shaft guide (16; 17), on which the seat part (9) can be displaced in no. m the limits of the control area. 8. Device according to claim 7, characterized in that the guide (16) is bent to the shape, advantageously said that the guide rises from the front canyon of the seat part in the direction towards the rear edge. 9. Device according to any of the preceding claims, characterized in that the limit in the nqso ridge (1.8) 35 for the movement of the seat part (9) and the backrest (1Π)