EP1897467A1 - Chair - Google Patents

Abstract

A seat (2) on a school-pupil's chair is molded as a double-shell plastic mold with two or more stiffening ribs (24) extending from a seat part's (20) underside to a backrest's (22) rear side. The stiffening ribs form a side edge for the chair in a transitional area from the backrest to the seat part.

Description

The invention relates to a chair, in particular a school chair, with a support frame made of a pipe material and a seat, which has a seat part and a backrest and is mounted on the support frame.

A generic chair is for example from the DE 86 27 534 U1 known. The backrest is integrally formed on the seat part. Such chairs usually have a wooden or plastic seat, but other materials such as composite or metal may be used.

Especially when used in the school sector chairs are often exposed to heavy loads. For ergonomic reasons, the chairs should have some resilience or elasticity to support a dynamic sitting of the student. Under a dynamic sitting while sitting under frequent changing a seating position, in particular with changes between front and rear seating position, understood.

It is an object of the present invention to provide a chair which allows a dynamic sitting and has a high load capacity.

This object is achieved by a chair, in particular by a student chair, with a support frame made of a pipe material and a seat having a mounted on the support frame seat part and integrally formed on the seat part backrest, the seat as a double-shell plastic mold with at least two themselves Is formed from a bottom of the seat part to a rear side of the backrest extending stiffening ribs.

By a suitable plastic, for example polypropylene, in particular polypropylene homopolymer (PPH) is a robust seat to produce. In particular, in a transition region between the seat part and the backrest increased stress on the chair due to a dynamic sitting of a student or another user and associated load changes occurs. The stiffening ribs according to the invention reinforce at least this transition region. Due to the stiffening ribs, the angle between the seat part and the backrest is not or only insignificantly changed during a load. A load on the transition area, for example, due to a reclining of the student or another user is transmitted via the seat part on the support frame.

In one embodiment of the chair, the stiffening ribs form the lateral end of the chair, at least in a transition region from the backrest to the seat part. The stiffening ribs thus act as a seat-backrest frame.

In a further embodiment of the chair, the stiffening ribs are arranged symmetrically to a median plane of the chair. Chairs are usually symmetrical. The median plane of the chair is the symmetry plane between the two sides of the chair. Due to the symmetrical arrangement of the stiffening ribs a symmetrical distribution of the load can be achieved.

In a further embodiment of the chair, the stiffening ribs extend over at least one third, in particular over at least half, preferably over at least three quarters of a height of the backrest. In one embodiment, the cross section of the stiffening ribs tapers in the direction of an upper edge of the chair. In a further embodiment, the stiffening ribs run in such a way that they follow a contour of the back part. This gives a high aesthetics. By extending the stiffening ribs in the direction of the upper edge, a good stiffening of the angle between the backrest and the seat part is possible.

In a further embodiment of the chair, the stiffening ribs extend over at least one third, in particular at least half, preferably at least three quarters of a length of the seat part. By stiffening ribs and thus the seat part of the chair is stiffened.

In a further embodiment of the chair, at least one of the stiffening ribs has a substantially triangular cross-section. A base of the triangle is assigned to the seat, wherein the opposite tip of the back of the backrest and / or protrudes from the underside of the seat part. Due to the triangular cross section, a stiffening is achieved. At the same time, the triangular shape offers a high level of aesthetics.

In a further embodiment of the chair, at least two stiffening ribs are connected to one another on the underside of the seat part via an arcuate region. By the connection of the stiffening ribs on the underside of the seat part a resilient effect of the seat part is maintained. In one embodiment, the stiffening ribs are connected to each other in the front region of the seat part. In this case, a region is referred to as a region which reaches a maximum of half the length of the seat part, preferably up to one third of the length of the seat part, measured from a front edge in the direction of the backrest. By attaching the arcuate portion in the front region of the seat part, a better stiffening of this area is achieved when sitting the student at the front edge.

In a further embodiment of the chair, the support frame comprises two spaced-apart, substantially U-shaped frame parts in side view, each having a support leg associated with the seat part and a stand leg, each via a substantially vertically arranged, the seat height substantially determining web are connected. The support frame is thus designed in the manner of a cantilever. Such a support frame allows for good compliance under load and thus a favorable dynamic sitting.

In a further embodiment of the chair, the support frame is mounted on the seat part such that the web is arranged substantially in extension of the backrest. Such chairs are also referred to as console chairs. The arrangement of the web in extension of the backrest, it is possible to attach the chair to a table so that the support legs rest on a table top. The design of the chair as a console chair allows, in particular with simultaneous arrangement of the stiffening ribs symmetrical to the center plane, a good stackability.

In a further embodiment of the chair, the web is curved convexly to the rear. The convex curvature of the web is continued in one embodiment in the support leg.

In a further embodiment of the chair, the support legs are formed to converge towards a front edge of the seat part. By running the support legs a vibratory effect of the support frame and thus the chair is further improved.

In a further embodiment of the chair, the support frame is integrally formed, wherein the support legs are connected to each other at the bottom of the seat part via a bracket. As a result, corners and / or edges on the underside of the seat part can be avoided.

In a further embodiment of the chair, the bracket is arc-shaped and is at least partially against the corresponding arcuate portion of the stiffening ribs. The bracket is embedded in one embodiment in the arcuate portion of the stiffening ribs. In other embodiments, the bracket abuts an inner contour or an outer contour of the arcuate region. As a result, a good connection of the seat part to the support frame and thus a good swinging effect can be achieved.

In a further embodiment of the chair, the bracket is arranged in a front region of the seat part. As already explained, the area is designated by a front area, which extends to a maximum of half the length of the seat part, preferably up to a third of the length of the seat part, measured from the front edge extends. By Attachment of the bracket in the front area, an elastic effect is further improved.

In a further embodiment of the chair, a receiving hook is formed on a front edge of the seat part. The receiving hook is shaped so that the chair via the receiving hook and an opposite portion of the support frame is suspended from a table top. This makes it possible to arrange the chair at the top of the table top, for example for cleaning the room, whereby the surface of the table top is spared.

In a further embodiment of the chair, an upper edge of the backrest is at least partially flattened. The upper edge of the backrest is usable for a so-called standing sitting.

In a further embodiment of the chair, the transition region between the seat part and the backrest has a passage opening. The access opening is arranged at a height which allows a good wearing with optimized power distribution.

In a further embodiment of the chair, the access opening is arranged between the stiffening ribs. The arrangement of the stiffening ribs on the sides of the access opening, it is possible to wear a gripped chair close to the body.

In a further embodiment of the chair, the backrest on the front and / or the back at least one identification field. The identifier field can be used, for example, to affix a name.

In a further embodiment of the chair are at least two forms from the group comprising the shape of the backrest, the Shape of the seat part, the shape of the passage opening and the shape of the identification field formed substantially as a congruent or congruent-like shapes. The components speak the same language of form, so that an aesthetically pleasing design is achieved.

In a further embodiment of the chair, the seat part and / or the backrest are tapered in the transition region. By the rejuvenation a sitting in the opposite direction on the chair is possible, with a chest of a student faces the backrest.

In a further embodiment of the chair, at least one groove for hooking the chair into a book basket is provided on the underside of the seat part. School tables often have so-called book baskets on an underside of the table top. Book baskets are formed for example as a wire frame or from a curved round material. The book baskets are usually attached approx. 10cm away from a table edge. Through a groove in the transverse direction parallel to the backrest or to the course of the front edge on the underside of the seat part, it is possible to hook the chair in this book basket.

In a further embodiment of the chair, a limited body contact surface is formed on the upper side of the seat part and / or on the front side of the backrest. Body contact surfaces are the surfaces which, when sitting on the chair, come into contact with the student or another user. The body contact surfaces are characterized in one embodiment by color design.

In a further embodiment of the chair, a survey causes the boundary of the body contact surface. An elevation of the contact surfaces improves ventilation in the cross area.

In a further embodiment of the chair, the body contact surface is leather-grained. A leather-grained design of the body contact surface achieves good aesthetics. At the same time a non-smooth surface is realized by the leather-grained design.

In a further embodiment of the chair, the body contact surface has ventilation holes. In one embodiment, the ventilation holes are retrofitted, for example by drilling, into the body contact surfaces. The ventilation holes prevent the body from adhering to the body contact surface.

In a further embodiment of the chair, the ventilation holes are formed in a U-shaped, open to the front edge pattern. The U-shaped pattern allows an aesthetically pleasing design of the chair, wherein the areas which predominantly come into contact with the body, are particularly well ventilated.

In a further embodiment of the chair, the double-shelled plastic mold is blow-molded and / or rotationally pressed. By blow molding a simple production of the chair as a double blow molding shell is possible.

Further advantages of the invention will become apparent from the following description of embodiments of the invention, which are shown schematically in the drawings. For identical or similar components uniform reference numerals are used.

Fig. 1:

eine perspektivische Hinteransicht eines erfindungsgemäßen Stuhls;

Fig. 2:

eine perspektivische Vorderansicht des Stuhls gemäß Fig. 1;

Fig. 3:

eine Hinteransicht des Stuhls gemäß Fig. 1;

Fig. 4:

eine Unteransicht des Stuhls gemäß Fig. 1;

Fig. 5:

eine Unteransicht eines erfindungsgemäßen Stuhls gemäß einem zweiten Ausführungsbeispiel;

Fig. 6:

eine Seitenansicht des Stuhls gemäß Fig. 1, welcher auf einer Tischplatte angeordnet ist;

Fig. 7:

eine Seitenansicht des Stuhls gemäß Fig. 1, welcher in einen Bücherkorb eingehängt ist;

Fig. 8:

eine Seitenansicht eines erfindungsgemäßen Stuhls gemäß einem dritten Ausführungsbeispiel, welcher an einer Tischkante eingehakt ist, und

Fig. 9:

eine Draufsicht auf einen erfindungsgemäßen Stuhl gemäß einem vierten Ausführungsbeispiel, welcher Belüftungslöcher aufweist.

In the drawings show:

Fig. 1:

a rear perspective view of a chair according to the invention;

Fig. 2:

a front perspective view of the chair of FIG. 1;

3:

a rear view of the chair of FIG. 1;

4:

a bottom view of the chair of FIG. 1;

Fig. 5:

a bottom view of a chair according to the invention according to a second embodiment;

Fig. 6:

a side view of the chair of Figure 1, which is arranged on a table top.

Fig. 7:

a side view of the chair of Figure 1, which is mounted in a book basket.

Fig. 8:

a side view of a chair according to the invention according to a third embodiment, which is hooked to a table edge, and

Fig. 9:

a plan view of a chair according to the invention according to a fourth embodiment, which has ventilation holes.

1, 2, 3 and 4 show a chair 1 according to a first embodiment in a rear perspective view, a front perspective view, a rear view and a Bottom view. The chair 1 comprises a seat 2 and a support frame 3 made of pipe material. The seat 2 is configured as a double-shell plastic blow mold and has a seat part 20 and a backrest 22. The seat part 20 is connected to its underside shown in Fig. 4 with the support frame 3.

In the illustrated embodiment, the support frame 3 has two spaced-apart, in a side view substantially U-shaped frame parts, each with a seat part 20 associated support legs 30, a leg 32 and a substantially vertically arranged, a seat height determining web 34th Die Carrying leg 30 and the stand legs 32 are each connected via the associated web 34. The support frame 3 is thus formed in the manner of a cantilever. The illustrated support frame 3 is elastically deformable when using the chair 1, wherein the shape shown has a good vibration behavior. For improved stability, the illustrated support frame 3 further comprises a transverse strut 36, by which the stand legs 32 are interconnected.

As can be seen in the bottom view of FIG. 4, the support frame 3 is integrally formed in the illustrated embodiment. The support legs 30 are formed in the embodiment so that they converge toward one another in the direction of a front edge 21 of the seat part 20, wherein the support legs 30 are connected by an arcuate bracket 38 in a front region of the seat part 20. As a result, a good elasticity effect of the chair 1 is achieved with an ergonomically favorable, dynamic sitting.

As can be seen in FIGS. 1 and 2, the web 34 is arranged substantially in extension of the backrest 22. The chair 1 is thus designed as a so-called console chair. The web 34 is after the Rear of chair 1 convex. This positively influences the aesthetics and vibration properties.

The chair 1 is exposed to high loads due to use, especially as a student chair. According to the invention, the seat 2 has two stiffening ribs 24 extending from an underside of the seat part 20 to a rear side of the backrest 22. The stiffening ribs 24 form in a transition region from the backrest 22 to the seat part 20, which is also referred to as the waist, the lateral conclusion of the chair 1. In the illustrated embodiment, the stiffening ribs 24, which are also referred to as spars, parallel to the seat part 20th a substantially triangular cross-section. The stiffening ribs 24 are arranged symmetrically with respect to a in Fig. 3 indicated by a dash-dot line center plane M. As can be seen further in FIG. 3, the stiffening ribs 24 in the illustrated exemplary embodiment extend over approximately two thirds of the height of the backrest 22. The stiffening ribs 24 follow the contour of the backrest 22 in the region of the backrest 22. A possible dynamic use of the chair 1 becomes thus made visible by aesthetic means.

As can be seen in FIG. 4, the reinforcing ribs 24 continue to extend over the entire length of the seat part 20. In the reinforcing ribs 24, recesses 23 are formed into which the support legs 30 can be inserted. In one embodiment, the support legs 30 are locked in the recesses 23. Alternatively or additionally, the carrying leg 30 can also be screwed into the recesses 23 with the seat part 20. The connection of the support legs 30 with the recesses 23 has in one embodiment bearing elements for a secure connection. As can also be seen in FIG. 4, the underside of the seat part 20 has a groove 25, which runs in the transverse direction of the chair 1. The meaning will be explained in more detail below with reference to FIG. 7.

In the illustrated embodiment, a through-opening 26 and identification fields 27 and 28 are further formed in the region of the median plane M. The access opening 26 lies between the two stiffening ribs 24 so that the chair 1 can be grasped by a user in such a way that an upper edge 29 of the backrest 22 comes to lie in the region of an armpit of the user, with the rear side of the backrest 22 closely adjacent to the body of the user may be present. By attaching the stiffening ribs 24 laterally of the through-opening 26 and by arranging the passage opening 26 in the transition region between the seat part 20 and the backrest 22 thus ergonomically particularly advantageous carrying the chair 1 is possible.

The identification fields 27, 28 are used for attaching name badges or the like. In the illustrated embodiment, an identification field 28 is arranged on the front side of the backrest 22 and two identification fields 27 on the back of the backrest 22. The access opening 26 and the identification fields 27, 28 each have a substantially parallel to a top edge 29 in the illustrated embodiment Edge and a downward convex edge on. The shapes and the size of the passage opening 26 and the identification fields 27, 28 are substantially the same, so that a good aesthetics is given. In the illustrated embodiment, the aesthetics are further enhanced by attaching two indicia fields 27 on the back of the backrest 22 which mimic a spinal column.

The shape of the seat part 20, the backrest 22, the access opening 26 and the identification fields 27, 28 are formed substantially semicircular in the illustrated embodiment. These forms are congruent or congruent-like. This uniform design language thus allows an aesthetically pleasing design of the chair. 1

The chair 1 allows dynamic sitting on the front edge 21 and in a rear area. In the illustrated embodiment, the upper edge 29 of the backrest 22 is flattened, so that the upper edge 29 is further usable for a standing still. In addition, the seat part 20 and the backrest 22 are tapered in the transition region between the seat part 20 and the backrest 22 in the illustrated embodiment. By this rejuvenation a comfortable backward sitting on the chair 1 is possible.

Fig. 5 shows a bottom view of a chair 101 according to the invention according to a second embodiment of the invention. The chair 101 substantially corresponds to the chair 1 according to FIGS. 1 to 4. For identical or similar components, the same reference numerals are used and a detailed description of these components will be omitted. In the chair 101 according to FIG. 5, a transition region between a seat part 20 and the backrest 22 is stiffened via stiffening ribs 124. The stiffening ribs 124 are connected to each other at the bottom of the seat part 20 via an arcuate portion 120. The stiffening ribs 124 or spars thus do not end, as shown in Fig. 4, at the front edge 21, but go over the arcuate portion 120 into each other. By such a design, a good resilient effect of the seat part 20, in particular in a front area, can be achieved. The shape of the arcuate region 120 corresponds to the shape of the bracket 38.

Fig. 6 shows a chair 1, which is placed on a table top 40 of a table 4. The height of the table 4 is determined by table legs 42. In order to protect a surface of the table top 40, glides 5 are attached to the legs 32 of the chair.

Fig. 7 shows a table 104 with a table top 40, table legs 42 and a book basket 44. The book basket 44 is formed as a wire frame. In the book basket 44, a chair 1 according to FIGS. 1 to 5 is mounted, wherein the visible in Figs. 4 and 5 grooves 25 engage in a rod of the book basket 44.

Fig. 8 shows a chair 201 according to a third embodiment and a table 4 with table legs 42 and table top 40. The chair 201 corresponds substantially to the chair 1 according to FIGS. 1 to 4, so that for a detailed description of the individual components these figures are referenced. The chair 201 has a receiving hook 221 at its front edge 21. By the receiving hook 221 and the web 34 of the chair on an upper side of a table top 40 of a table 4 can be attached, wherein a surface of the table top 40 is spared.

Fig. 9 shows schematically a top view of a chair 301 according to a fourth embodiment of the invention. The chair 301 also essentially corresponds to the chair 1 according to FIGS. 1 to 4, so that a detailed description is dispensed with. In the chair 301, a body-contacting surface 320 of the seat part 20 and a body-contacting surface 322 of the backrest 22 are raised with respect to the remaining surface of the seat part 20 and the backrest 22. The body contact surface 320 of the seat part 20 in this case has ventilation holes 6, which are incorporated in a U-shaped pattern, which is open towards the front edge 21, into the surface of the seat part 20.

The ventilation holes 6 can be introduced, for example, after production of the chair 301 by drilling into the surface.

Claims (28)

Chair, in particular a student chair, with a support frame made of a tube material and a seat, which has a seat part mounted on the support frame and a backrest integrally formed on the seat part,
characterized in that
the seat (2) is formed as a double-shelled plastic mold with at least two stiffening ribs (24) extending from an underside of the seat part (20) to a rear side of the backrest (22). Chair according to claim 1, characterized in that the stiffening ribs (24) form the lateral end of the chair at least in a transition region from the backrest (22) to the seat part (20). Chair according to claim 1 or 2, characterized in that the stiffening ribs (24) are arranged symmetrically to a median plane (M) of the chair (1). Chair according to claim 1, 2 or 3, characterized in that the stiffening ribs (24) extend over at least a third, in particular over at least half, preferably over at least three quarters of a height of the backrest (22). Chair according to one of claims 1 to 4, characterized in that the stiffening ribs (24) extend over at least one third, in particular at least half, preferably at least three quarters of a length of the seat part (20). Chair according to one of claims 1 to 5, characterized in that at least one of the stiffening ribs (24) has a triangular cross-section. Chair according to one of claims 1 to 6, characterized in that at least two stiffening ribs (124) on the underside of the seat part (22) via an arcuate portion (120) are interconnected. Chair according to one of claims 1 to 7, characterized in that the support frame (3) has two spaced apart, in the side view substantially U-shaped frame parts, each with a seat part (20) associated support legs (30), a stand ( 32) and a substantially vertically arranged, the support leg (30) and the stand leg (32) connecting web (34). Chair according to claim 8, characterized in that the support frame (3) is mounted on the chair (1, 101, 201) such that the web (34) is arranged substantially in extension of the backrest (22). Chair according to claim 8 or 9, characterized in that the web (34) is convexly curved backwards. Chair according to claim 8, 9 or 10, characterized in that the support legs (30) in the direction of a front edge (21) of the seat part (20) are formed to converge towards each other. Chair according to one of claims 8 to 11, characterized in that the support frame (3) is integrally formed, wherein the Support legs (30) on the underside of the seat part (20) via a bracket (38) are interconnected. Chair according to claim 12, characterized in that the bracket (38) is arcuate and at least partially against the corresponding arcuate portion (120) of the stiffening ribs (124). Chair according to claim 12 or 13, characterized in that the bracket (38) is arranged in a front region of the seat part (20). Chair according to one of the preceding claims, characterized in that on a front edge (21) of the seat part (20) has a receiving hook (221) is formed. Chair according to one of the preceding claims, characterized in that an upper edge (29) of the backrest (22) is at least partially flattened. Chair according to one of the preceding claims, characterized in that the transition region between the seat part (20) and the backrest (22) has a passage opening (26). Chair according to claim 17, characterized in that the passage opening (26) between the stiffening ribs (24) is arranged. Chair according to one of the preceding claims, characterized in that the backrest (22) on the front and / or the back at least one identification field (27, 28). Chair according to one of the preceding claims, characterized in that at least two forms from the group comprising the shape of the backrest (22), the shape of the seat part (20), the shape of the passage opening (26) and the shape of the identification field (27, 28 ) are formed substantially as congruent or congruent-like shapes. Chair according to one of the preceding claims, characterized in that the seat part (20) and / or the backrest (22) are tapered in the transition region. Chair according to one of the preceding claims, characterized in that on the underside of the seat part (20) at least one groove (25) for hooking the chair (1, 101, 201, 301) in a book basket (44) is provided. Chair according to one of the preceding claims, characterized in that on the upper side of the seat part (20) and / or on the front side of the backrest (22) a limited body contact surface (320, 322) is formed. Chair according to claim 23, characterized in that a boundary of the body contact surface (320, 322) is effected by a survey. Chair according to claim 23 or 24, characterized in that the body-contacting surface is leather-grained. Chair according to claim 23, 24 or 25, characterized in that the body-contacting surface (320) has ventilation holes (6). Chair according to claim 26, characterized in that the ventilation holes (6) are formed in a U-shaped, to the front edge (21) open pattern. Chair according to one of the preceding claims, characterized in that the double-shell plastic mold is blow-molded and / or rotationally pressed.

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