A device with tilt mounting for chair

Abstract

 A device at tilt mounting (1) for chair, where the seat (2) of the chair is tiltable forwards and backwards against spring force from tilt resistance springs (3), where the tilt mounting (1) has an upper part (4) which is attachable to the seat (2) of the chair and a lower part (5) which is attachable to the undercarriage (6) of the chair and tiltably connected to the upper part (4), and where tilt resistance is adjustable by adjustment of the pre-tensioning of the springs (3), wherein the distance between an upper spring seat (7) allocated the upper part (4) and a lower spring seat (8) allocated the lower part (5) is altered, wherein two lower flap-like spring seats (8) are mutually opposite tiltably arranged relative to each other for altering said distance, wherein each lower spring seat (8) is provided with a respective arm or portion (9) projecting up in operative thread connection with the thread portion (10) of a common rotatable adjusting lever (11), wherein the distance between the connection points of the arms (9) along the thread portion (10), and thus the mutually opposite tilt positions of the lower spring seat (8), is altered by rotating the adjustment lever (11).

Description

[0001] The present invention relates to a device with tilt mounting for chair, where the seat of the chair is tiltable forwards and backwards against spring force from tilt resistance springs, where the tilt mounting has an upper part which is attachable to the chair seat and a lower part which is attachable to the undercarriage of the chair and tiltably connected to the upper part, and where tilt resistance is regulative by adjusting the pre-tensioning of the springs. More specifically, the invention relates to a device as specified in the preamble of the independent claim 1.

[0002] There exist several previously known tilt mountings for chairs, and particularly office chairs, and emphasizing different characteristics and functional controls. As an example of an earlier tilt mounting reference is made to the mounting shown and described in the applicant's Norwegian patent no. 327014.

[0003] With basis in the prior art, an object of the invention is to provide an especially compact and simple construction, and which is tried solved by a device as specified in the characterizing part of the independent claim 1.

[0004] Preferred embodiments of the invention are disclosed by the dependent claims.

[0005] A preferred, not limiting embodiment of the invention is further described in the following, with reference to the attached drawings, where

fig. 1 is a front perspective view of the device according to the invention, where the tilt mounting is attached to a chair seat and to an upper part of the undercarriage of the chair,

fig. 2 is a side view corresponding to fig. 1,

fig. 3 is a rear view corresponding to fig. 1,

fig. 4 is a cross-sectional view along the line A-A in fig. 2, with the tilt resistance springs of the tilt mounting in a minimal pre-tensioned position,

fig. 5 is a cross-sectional view along the line B-B in fig. 2, with the tilt resistance springs of the tilt mounting in a minimal pre-tensioned position,

fig. 6 is a cross-sectional view corresponding to fig. 4, but with the tilt resistance springs of the tilt mounting in a maximum pre-tensioned position,

fig. 7 is a cross-sectional view corresponding to fig. 5, but with the tilt resistance springs of the tilt mounting in a maximum pre-tensioned position,

fig. 8 is a perspective view of parts of the tilt mounting shown in fig. 1 to 7, and

fig. 9 is another perspective view of parts of the tilt mounting shown in fig. 1 to 7.

[0006] In the description below, direction indications such as "front", "rear", "upper", "lower", "upwards", "downwards", or similar related to the standing operational position of the chair.

[0007] It should further be noticed that even though this is not shown in the figures, and of illustrating considerations, the mounting will among other of visual and functional considerations and also of safety considerations be in all essentials encased, such that what is visible from the outside is an upper and a lower part of the mounting arranged with a mutual clipping motion and with the necessary operating levers projecting out from the mounting. In the figures, only the operating lever for altering the pre-tensioning of the tilt resistance springs is shown, but for other functions of the tilt mounting, normally other operating levers are provided, and a latch lever as shown and described in the applicants Norwegian patent application with reference P61202507NO00 and filed the same day as the present application can especially preferably be provided for locking the mounting in different desired tilt positions and also releasable from these.

[0008] With reference to the figures, and especially fig. 1 to 7, it is according to the invention shown a device with tilt mounting 1 for chair, where the seat 2 of the chair is tiltable forwards and backwards against spring force from tilt resistance springs 3, where the tilt mounting 1 has an upper part 4 which is attachable to the chair seat 2 and a lower part 5 which is attachable to the undercarriage 6 of the chair and tiltably connected to the upper part 4, and where tilt resistance is regulative by adjusting the pre-tensioning of the springs 3, as the distance between an upper spring seat 7 allocated the upper part 4 and a lower spring seat 8 allocated the lower part 5 is altered. This as two lower flap-like spring seats 8 are mutually opposite tiltably arranged in proportion to each other for altering said distance, as each lower spring seat 8 is provided with a respective arm or portion 9 projecting up in operative thread connection with the thread portion 10 of a common rotatable adjusting lever 11, and as the distance between the connection points of the arms 9 along the thread portion 10, and thus the mutually opposite tilt positions of the lower spring seat 8, is altered by rotating the adjustment lever 11.

[0009] The springs 8 are preferably, and as shown, helical springs, but could alternatively be elastomeric blocks.

[0010] The two flap-like lower spring seats 8 are preferably provided with respective longitudinal projecting grooves 12 at each lower edge, for tiltable contact with two corresponding longitudinal recessed grooves 13 arranged in parallel in a middle portion 14 projecting up of the lower part 5, as is especially evident from fig. 8 and 9.

[0011] Each lower flap-like spring seat 8 is preferably provided with a tilt element 15 for contacting a lower part of the spring 3 and to counteract bending of the springs 3 about their longitudinal axis by compensating for altered tilt positions for the lower spring seats 8, as is also especially evident from fig. 8 and 9.

[0012] The connection points for each arm is preferably in the shape of a respective boss 16 turnably attached to each respective arm 9, and provided with respective leveled passing thread openings for guiding through of and thread connection with the thread portion 10 of the adjustment lever 11. Each boss 16 is preferably supported between two outer branches of each respective arm 9, and with its turn axis parallel with the tilt axis of the flap-like lower spring seat 8 and normal on the length axis of the adjustment lever. The bosses are, as it will also be evident for the person skilled in the art in light of the description and drawings, provided to retain level thread openings in the connection points at the different tilt positions for the lower spring seats 8. Further, it is preferably arranged a stopping pin in an outer end of the thread portion 10 of the adjustment lever 11, as is also evident from fig. 8 and 9.

[0013] The upper spring seats 7 are preferably provided with a respective substantially conical tapered portion 18 adapted the inner end portion of the helical springs 3, as the substantially conical tapered portion 18 is formed as a recess in the upper part 4.

[0014] The present invention is not limited by the above description, but can vary within the scope of the attached claims.

Claims

1. A device at tilt mounting (1) for a chair, where the seat (2) of the chair is tiltable forwards and backwards against spring force from tilt resistance springs (3), where the tilt mounting (1) has an upper part (4) which is attachable to the seat (2) of the chair and a lower part (5) which is attachable to the undercarriage (6) of the chair and tiltably connected to the upper part (4), and where tilt resistance is adjustable by adjustment of the pre-tensioning of the springs (3), whererin the distance between an upper spring seat (7) allocated the upper part (4) and a lower spring seat (8) allocated the lower part (5) is altered, characterized in that two lower flap-like spring seats (8) are mutually opposite tiltably arranged relative to each other for altering said distance, wherein each lower spring seat (8) is provided with a respective arm or portion (9) projecting up in operative thread connection with the thread portion (10) of a common rotatable adjusting lever (11), wherein the distance between the connection points of the arms (9) along the thread portion (10), and thus the mutually opposite tilt positions of the lower spring seat (8), is altered by rotating the adjustment lever (11).

2. A device according to claim 1, characterized in that the springs (3) are helical springs or elastomeric blocks.

3. A device according to claim 1 or 2, characterized in that the two flap-like lower spring seats (8) are provided with respective longitudinal projecting grooves (12) at each lower edge, for tiltable contact with two corresponding longitudinal recessed grooves (13) arranged in parallel in a middle portion (14) projecting up of the lower part (5).

4. A device according to any of the preceding claims 1 to 3, characterized in that each lower flap-like spring seat (8) is provided with a tilt element (15) for contacting a lower part of the spring (3) and to counteract bending of the springs (3) about their longitudinal axis by compensating for altered tilt positions for the lower spring seats (8).

5. A device according to any of the preceding claims 1 to 4, characterized in that the connection points for each arm (9) is in the shape of a respective boss (16) turnably attached to each respective arm (9), and provided with respective leveled passing thread openings for guiding through of and thread intervention with the thread portion (10) of the adjustment lever (11).

6. A device according to claim 5, characterized in that each respective boss (16) is supported between two outer branches of each respective arm (9), and with its turn axis parallel with the tilt axis of the flap-like lower spring seats (8) and normal on the length axis of the adjustment lever (11).

7. A device according to any of the preceding claims 1 to 6, characterized in that a stopping pin (17) is arranged in an outer end of the thread portion (10) of the adjustment lever (11).

8. A device according to any of the preceding claims 2 to 7, characterized in that the upper spring seats (7) are provided with a respective substantially conical tapered portion (18) adapted the inner end portion of the helical springs (3), wherein the substantially conical tapered portion (18) is formed as a recess in the upper part (4).

Drawing