CN217937652U

CN217937652U - Height adjusting device for office chair

Info

Publication number: CN217937652U
Application number: CN202220530827.3U
Authority: CN
Inventors: 孟宪鸿
Original assignee: Ikea Supply AG
Current assignee: Ikea Supply AG
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2022-12-02
Anticipated expiration: 2032-03-10

Abstract

The utility model relates to a height adjusting device (1) for office chair, height adjusting device includes sliding sleeve (3) and locking mechanism (4) that can move for guide bar (2), and this sliding sleeve (3) includes an accommodation chamber (5) in order to hold this locking mechanism at least partially, and this locking mechanism (4) includes actuating piece (6) and retaining member (7), retaining member (7) can move between locking position and release position under the effect of actuating piece (6), wherein, in the locking position, retaining member (7) are compressed tightly on guide bar (2) and make sliding sleeve (3) keep in a height position; in the release position, the pressing force between the locking member (7) and the guide bar (2) is released to allow the height position of the sliding sleeve (3) to be adjusted. By adopting the height adjusting device of the utility model, the height of the seat part or the backrest part of the office chair can be more conveniently adjusted, and the safety of the seat part in the adjusting process can be ensured.

Description

Height adjusting device for office chair

Technical Field

The utility model relates to an office chair technical field specifically relates to a high adjusting device for office chair.

Background

Office chairs are commonly used in people's daily activities of working and learning. However, often in order to meet the use of users of different shapes, adjustment of the height position of the seat or backrest part of the office chair is required. In particular, in the field of child office chairs, there is an increasing demand for the design of such height adjustment devices in order to avoid the occurrence of an out-of-standard sitting posture of a child due to a mismatch in the height of the seat or backrest portion.

Various height adjustment devices for office chairs are known in the prior art, for example chinese patent application CN106667134A discloses a height adjuster for children's chairs comprising a telescopic rod provided with a pin hole, a sliding outer sleeve and a fixed screw. However, when the height position of the seat portion is adjusted using such a height adjusting device, it is necessary for the seat user to hold a part of the weight of the seat portion with the hand to prevent the seat portion from slipping off due to gravity, thereby causing a poor user experience when the seat user performs height adjustment. In addition, chinese patent CN215423688U also discloses a seat height adjusting mechanism which utilizes the threaded fit between the bolt and different threaded holes to realize the adjustment of different height positions, however, the mechanism relates to the manufacture of a series of threaded holes, which requires high processing precision, and the whole mechanism involves more parts.

Accordingly, there is a need for a new height adjustment device for an office chair that overcomes one or more of the problems set forth above and/or other deficiencies in the prior art.

SUMMERY OF THE UTILITY MODEL

The present invention has been made on the basis of such a background, and an object thereof is to provide a novel height adjustment device for an office chair, so that it has a simple and compact structure, and at the same time, can realize more simple and easy adjustment operation and ensure safer adjustment process.

The utility model provides a height adjusting device for office chair, height adjusting device includes sliding sleeve and the locking mechanism that can move for the guide bar, and this sliding sleeve includes a holding chamber in order to hold this locking mechanism at least partially, and this locking mechanism includes actuating piece and retaining member, the retaining member can move between locking position and release position under the effect of the actuating piece, wherein, in locking position, the retaining member is compressed tightly on the guide bar and makes the sliding sleeve keep in a high position; in the release position, the pressing force between the locking member and the guide lever is released to allow the height position of the sliding sleeve to be adjusted.

Advantageously, the actuating member comprises a knob portion and a pusher portion which are non-rotatable relative to each other, the pusher portion comprising a threaded section which is threadedly engaged in a complementary threaded section in the locking member.

Advantageously, around the thrust portion a spring is arranged, which rests at one end against a flange of the thrust portion and at the other end against an inner wall of the housing chamber.

Advantageously, when the knob portion is rotated in a first direction, the push portion is movable away from the guide rod by means of the threaded section and compresses the spring until the spring is compressed to an extreme position to reach the locking position; when the knob portion is rotated in a second direction opposite to the first direction, the pushing portion can be moved toward the guide rod by means of the threaded section until the knob portion comes to the rest position against the outer wall of the receiving cavity.

Advantageously, the guide bar is provided with a plurality of recesses at intervals along its longitudinal direction, and the locking member is provided with a projection capable of engaging with the recesses at an end facing the guide bar.

Advantageously, in the locking position, the projection of the retaining member is engaged and pressed in the corresponding recess of the guide bar; in the relaxed position, the projection can be held engaged in the recess by the biasing force of the spring.

Advantageously, the push portion and the knob portion are held in a single piece by a fastener.

Advantageously, the sliding sleeve is fixedly connected to the seat or backrest portion of the office chair, thereby allowing the height of the seat or backrest portion to be adjusted.

Advantageously, the projections of the locking element are provided with a coating for increasing the friction.

Advantageously, the sliding sleeve is provided on its inner surface with a layer of wear-resistant material in direct contact with the guide bar.

According to the utility model discloses a height adjusting device can adjust the height of the seat of office chair or back more conveniently, and can greatly improve especially the security of seat when the accommodation process.

Drawings

The above and other features and advantages of the present invention will become more readily understood from the following description taken in conjunction with the accompanying drawings, in which:

fig. 1 shows a schematic perspective view of a height adjustment device according to an embodiment of the present invention in a state of being mounted on a fixed guide bar (partially shown) of an office chair;

fig. 2 shows a schematic perspective view of a height adjustment device according to an embodiment of the invention in a state not mounted on a guide bar; and

fig. 3 shows a cross-sectional view of a height adjustment device according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Terms such as "first," "second," and the like are used hereinafter to describe elements of the present application and are used only to distinguish one element from another without limiting the nature, sequence, order, or number of such elements. In addition, descriptions about orientations such as "inside/outside" and the like may be used in the following description, unless explicitly stated otherwise, are only for convenience of description and are not intended to form any limitation on the technical solution of the present invention.

Referring to fig. 1, there is shown a schematic perspective view of a height adjustment device according to a specific embodiment of the present invention when mounted on a stationary guide bar (partially shown) of an office chair. The height adjustment device 1 comprises a sliding sleeve 3 which can be moved relative to a stationary guide rod 2, and a locking mechanism 4. To the sliding sleeve 3 is fixedly connected a metal support 14 which can be used for supporting a seat or backrest part of an office chair. Thereby, the height of the seat or backrest part relative to the ground can be adjusted accordingly when the sliding sleeve 3 slides along the guide bar 2, which makes it possible to accommodate seat users of different heights.

With particular reference to fig. 1 and 3, the sliding sleeve 3 comprises a housing 5 to at least partially house the locking mechanism 4, the locking mechanism 4 comprising an actuating member 6 and a locking member 7, the actuating member 6 comprising a knob portion 6a and a pusher portion 6b which are non-rotatable relative to each other. In the present embodiment, the knob portion 6a and the pushing portion 6b are held as a single piece by a fastener 12 such as a screw. Of course, it is conceivable that the knob portion 6a and the push portion 6b could also be held or formed as a non-rotatable one-piece body by other means known in the art.

In particular, the pushing portion 6b comprises a threaded section which is threadedly engaged in a complementary threaded section in said retaining member 7. When the knob portion 6a is turned, the locker 7 can be moved by means of the screw engagement using the push portion 6b between a locking position in which the locker 7 is pressed against the guide bar 2 to maintain the sliding sleeve 3 at a height position and a release position; in the relaxed position, the pressing force between the locking member 7 and the guide bar 2 is released, thereby allowing the height position of the sliding sleeve 3 to be adjusted.

Furthermore, around the propulsion portion 6b a spring 8 is arranged, which at one end rests against a flange 9 of the propulsion portion 6b and at the other end against the inner wall of the receiving chamber 5. When the knob portion 6a is rotated in a first direction (e.g., clockwise), the pushing portion 6b can move away from the guide bar 2 by means of the thread segments and compress the spring 8 until the spring 8 is compressed to an extreme position to reach the locking position; when the knob portion 6a is rotated in a second direction (e.g., counterclockwise) opposite to the first direction, the pushing portion 6b can be moved toward the guide bar 2 by means of the threaded section until the knob portion 6a abuts against the outer wall of the accommodating chamber 5 to reach the release position.

With particular reference to fig. 3, advantageously, the guide bar 2 is provided with a plurality of recesses 10 at intervals along its longitudinal direction, the locking member 7 being provided at the end facing the guide bar 2 with projections 11 able to cooperate with the respective recesses. As shown in fig. 3, two projections 11 are preferably provided on retaining member 7, however other numbers of projections are possible as long as the above-described function is achieved.

In the locking position, the projection 11 of the retaining member 7 is engaged and pressed in the corresponding recess 10 of the guide bar 2; in the release position, although the pressing force between the locking member 7 and the guide lever 2 is released, the projection 11 can be kept engaged in the recess 10 by the biasing force of the spring 8. This is important when adjusting the height position of the seat because after the user has screwed the knob portion 6a to release the pressing force between the guide bar 2 and the lock member 7, the sliding sleeve 3 can be held on the guide bar 2 before adjusting the height position of the seat because the projection 11 remains engaged in the recess 10, thus avoiding any insecurity due to the sliding sleeve 3 being suddenly dropped under the weight load of the metal bracket or the seat user.

With this projection-recess structure, when the user needs to adjust the height, the knob portion 6a is pulled only outward away from the guide bar 2 against the force of the spring 8 to disengage the projection 11 from the recess 10, so that the sliding sleeve 3 can move freely along the guide bar 2 and the knob portion 6a is released at a suitable height position, and the knob portion 6a urges the push portion 6b under the spring force and further urges the projection 11 of the locker 7 into the recess 10, and finally the locking operation of the locker is completed by screwing the knob portion 6 a.

According to an advantageous embodiment, the guide bar 2 can be provided with a height indicator to facilitate the user to quickly position, for example, the seat to the appropriate height position for his height. Specifically, a series of reference scales (e.g., a scale range of 115cm to 185cm representing the height) can be set on the guide bar 2 based on different heights of the users of the seat, so that when the users adjust the height by moving the sliding sleeve 3, only the scales on the guide bar 2 need to be referenced and the indicating members on the sliding sleeve 3 need to be aligned with the corresponding scales to select the height position suitable for themselves.

On the other hand, such a projection-recess arrangement can also provide redundant protection for the locking mechanism. In the locked position, in addition to being able to support the weight of the user by virtue of the friction between the guide bar 2 and the locking member 7 pressing against each other, an additional load-bearing effect can be provided by the projection-recess engagement. This prevents an undesired sliding off of the sliding sleeve as a result of the engagement of the projections and recesses once the contact pressure between the guide rod 2 and the locking element 7 has been released.

In particular, in order to increase the friction between the projections 11 of the locking member 7 and the recesses 10 of the guide bar 2, the projections 11 of the locking member may be provided with a coating for increasing the friction, for example a coating of TPE material. Of course, coatings in the form of other materials known in the art that can increase friction are also possible.

It will be appreciated that such height adjustment means may be adapted for fixed connection with the seat or backrest portion to allow adjustment of the height of the seat or backrest portion. Of course, such a projection-recess structure may be optionally omitted in the height adjustment device for the backrest portion, in view of the fact that the backrest portion does not bear a vertical load from the user.

According to an advantageous embodiment, a high-strength wear-resistant material layer 13 is provided on the inner surface of the sliding sleeve 3, with which wear-resistant material layer 13 direct contact between the inner surface of the sliding sleeve 3 of metal and the guide bar 2 can be avoided, which reduces both the noise during height adjustment and the wear of the material, thus improving the durability of the product.

It should be noted that the above-described embodiments should be regarded as merely exemplary, and the present invention is not limited to these embodiments. Upon consideration of the present specification, those skilled in the art can make various changes and modifications without departing from the scope or spirit of the present invention. The true scope of the invention is defined by the following claims and their equivalents.

Claims

1. A height adjustment device (1) for an office chair, said height adjustment device comprising a sliding sleeve (3) movable with respect to a guide bar (2) and a locking mechanism (4), characterized in that the sliding sleeve (3) comprises a housing chamber (5) to at least partially house the locking mechanism, the locking mechanism (4) comprising an actuating member (6) and a locking member (7), said locking member (7) being movable under the action of said actuating member (6) between a locking position and a release position, wherein, in said locking position, said locking member (7) is pressed against said guide bar (2) to maintain said sliding sleeve (3) in a height position; in the release position, the pressing force between the locking member (7) and the guide bar (2) is released to allow the height position of the sliding sleeve (3) to be adjusted.

2. Height adjusting device (1) according to claim 1, wherein the actuating member (6) comprises a knob portion (6 a) and a push portion (6 b) which are non-rotatable relative to each other, the push portion (6 b) comprising a threaded section which is threadedly engaged in a complementary threaded section in the locking member.

3. Height adjusting device (1) according to claim 2, characterized in that a spring (8) is arranged around the pushing part (6 b), which spring rests at one end against a flange (9) of the pushing part and at the other end against the inner wall of the receiving chamber (5).

4. A height adjustment device (1) according to claim 3, wherein when the knob portion (6 a) is turned in a first direction, the pushing portion (6 b) is movable by means of the threaded section away from the guide rod (2) and compresses the spring (8) until the spring is compressed to an extreme position to the locking position; when the knob part (6 a) is rotated in a second direction, which is opposite to the first direction, the pushing part (6 b) can be moved by means of the thread section towards the guide rod (2) until the knob part (6 a) reaches the release position against the outer wall of the receiving chamber (5).

5. Height adjusting device (1) according to claim 4, characterized in that the guide bar (2) is provided with a plurality of recesses (10) at intervals in its longitudinal direction, the locking element (7) being provided with a projection (11) at the end facing the guide bar (2) which can cooperate with the recesses.

6. Height adjustment device (1) according to claim 5, characterized in that in the locking position the projection (11) of the locking member is engaged and pressed in the corresponding recess (10) of the guide bar (2); in the relaxed position, the projection (11) can be held engaged in the recess (10) by the biasing force of the spring (8).

7. Height adjustment device (1) according to any one of claims 2 to 6, characterized in that the push portion (6 b) and the knob portion (6 a) are held in one piece by a fastener (12).

8. Height adjustment device (1) according to any one of claims 1 to 6, characterized in that the sliding sleeve (3) is fixedly connected to the seat or backrest part of the office chair, allowing the height of the seat or backrest part to be adjusted.

9. Height adjusting device (1) according to claim 5 or 6, characterized in that the projections (11) of the locking element (7) are provided with a coating for increasing friction.

10. Height adjusting device (1) according to any one of claims 1 to 6, characterized in that the inner surface of the sliding sleeve (3) is provided with a layer (13) of wear-resistant material which is in direct contact with the guide bar (2).