Dome chair with lockable row connection system

Abstract

Dome chair with a frame (20) and a structure (14) suitable for sitting mounted on it via at least one adapter (40) and with a row connection system (60) which has a positive (61) or negative interface (71) on each side (3, 4) of the chair, - wherein the adapter (40) has an adapter assembly (41, 42) on each side of the chair (3, 4), - wherein a positive (61) or negative interface (71) is arranged in each adapter assembly (41, 42), - wherein the negative interface (71) of a first chair can be coupled to the positive interface (61) of a second chair by means of a positive coupling offset (6) - blocking two linear and three rotational degrees of freedom and - wherein, to lock the third linear degree of freedom, a directly or indirectly actuated - self-locking - locking piece (81) limits or locks the negative coupling offset (6) and - wherein the positive interface (61) is a nut-shaped mushroom body (62) with a central head recess (65), while the negative interface (71) is a circumferential body (72) with a T-slot-shaped recess (75), wherein the locking piece (81) can be inserted into the head recess (65) for locking.

Description

[0001] The invention relates to a dome chair with a frame and a structure suitable for sitting mounted thereon via at least one adapter, as well as with a row connection system that has a positive or negative interface on each side of the chair.

[0002] A dome chair is a single chair, which can also be stacked, that can be connected to other, identical dome chairs to form a row. Adjacent dome chairs are either linked together via separate dome elements or they have a special frame construction so that, for example, individual chair legs or armrests interlock or overlap. In the latter case, the separate dome elements are omitted. The coupling function is then usually not immediately apparent from the individual chair.

[0003] Such a coupling chair is known from DE 199 44 503 C1. To couple the chairs, the chair to be coupled is placed next to the chair already in the row. It is then lifted and moved laterally over the stationary chair until the front leg of the chair to be coupled – including the armrest – is moved into the seating area of ​​the stationary chair. The linking process is completed when the chair to be coupled is placed back down.

[0004] US Patent 26,071 E describes a stacking chair consisting of a frame, a seat, and a backrest. A coupling rail with a rear handle is located on each side of the chair on the rear vertical struts of the frame. A chair to be coupled is lifted and lowered into the coupling rail of the adjacent chair. An angled gap initially exists between the two partially coupled stacking chairs, the narrowest point of which is located at the coupling rails. The lower horizontal struts of the frame each have an elastic snap connector on each side of the chair. When the angled gap is minimized by pivoting the chair to be coupled, the snap connectors of the adjacent stacking chairs engage.

[0005] From DE 20 2006 018 214 U1, a stackable chair is known which, for forming a row connection, has an insertion part in the form of a vertical pin on one side of the chair and a receiving part in the form of a vertical bore on the other side. The insertion part supports a pivotable locking ring, the pivot axis of which is oriented parallel to the longitudinal extent of an erected row of chairs. To prevent the pin from being lifted out of the bore, the locking ring is pivoted manually by a few degrees.

[0006] The present invention is based on the problem of developing a dome chair that is recognizable as such and can also be coupled to similar chairs with minimal effort in a panic-proof manner and uncoupled again in a simple way.

[0007] This problem is solved by a dome chair with the features of claim 1. The adapter has one adapter assembly per side of the chair. Each adapter assembly contains a positive or negative interface. The negative interface of a first chair can be coupled to the positive interface of a second chair by means of a positive coupling offset – thereby blocking two linear and three rotational degrees of freedom. To block the third linear degree of freedom, a directly or indirectly actuated – self-locking – locking element limits or locks the negative coupling offset. The positive interface is a T-nut-like mushroom body with a central head recess, while the negative interface is a circumferential body with a T-slot-shaped recess, wherein the locking element can be inserted into the head recess for locking.

[0008] In this embodiment, the series connection is locked via a mechanical sliding joint. The latter can be replaced, for example, by a screw joint or a combined sliding screw joint.

[0009] Furthermore, a linear movement is provided for the dome offset. However, it is also possible to have this movement take place on a curved two- or three-dimensional trajectory.

[0010] Further details of the invention will become apparent from the dependent claims and the following descriptions of the embodiments schematically illustrated in the figures. The figures show: Fig. 1: Two stacked dome chairs with armrests seen from the side; Fig. 2: A domed chair shown in perspective from a low angle; Fig. 3: Underside view of a right adapter base; Fig. 4: Side view of the adapter base after Fig. 3; Fig. 5: Cut to Fig. 4; Fig. 6: Underside view of an actuating element; Fig. 7: Section through the dome and locking mechanism of two chairs perpendicular to the dome offset; Fig. 8: Perspective view of the mushroom body from the front and obliquely from above; Fig. 9: Perspective view of the mushroom body from behind and obliquely from above; Fig. 10: Perspective view of the back of the enclosure body from a slanted top view; Fig. 11: Perspective view of the front of the enclosing body with the mushroom body from a slanting angle above; Fig. 12: Two coupled dome chairs with armrests seen from the front.

[0011] The Fig. Figure 1 shows two stacked dome chairs (10, 11) in side view, while they Fig. The diagram shows 12 coupled in rows as dome chairs (12, 13). Each dome chair (10) essentially consists of, for example, a frame (20) and a seat assembly (14), for example, in the form of a one-piece seat shell (15). The frame (20) and the seat shell (15) are connected to each other by means of an adapter assembly (41, 42) on each side (3, 4) of the chair. Each dome chair (10-13) has an interface (61, 71) of a row connection system (60) on each side (3, 4). The interfaces (61, 71) are secured against arbitrary uncoupling by means of a releasable locking mechanism (80).

[0012] The seat shell (15) comprises a seat (16) and a backrest (19). It is made, for example, of plywood, resin-bonded wood, or a comparable material or composite material. The seat shell (15) shown has an average material thickness of, for example, 10 mm. It may serve as a support for upholstery and a lower shell.

[0013] The seat (16) has, for example, a constant width of approximately 443 mm and a maximum seat depth of 420 mm. It has a central area and an edge area. The central edge area lies at least approximately in one plane, while the central area forms a concave depression that curves downwards by, for example, 25 mm. At the front, the seat (16) is drawn downwards by, for example, 27.5 mm with a radius of, for example, 33 mm.

[0014] The backrest (19), whose lower width corresponds to the seat width and whose height is, for example, 434 mm, connects to the seat (16) via a rounded transition area. The upper edge of the backrest (19) is, for example, curved in an arc, with a radius of curvature – perpendicular to the backrest inclination – of, for example, 780 to 800 mm. The average backrest inclination is, for example, 15 to 17 degrees. The backrest (19) tapers laterally upwards by, for example, 4 to 5 degrees on each side. The seat (16) and the backrest (19) form an average angle of between 95 and 105 degrees.

[0015] The frame (20) of the dome chair (10) is a tubular frame made of, for example, chrome-plated, burnished, or painted steel tubes. The steel tubes used have, for example, an outer diameter of 18 mm and a wall thickness of, for example, 2 mm.

[0016] Each frame (20) consists of two leg elements (21, 31). Both leg elements (21, 31) comprise a front (22, 32) and a rear chair leg (23, 33), which are connected by a longitudinal brace (24, 34). Both leg elements (21, 31) are rigidly connected by a front (28) and a rear crossbar (38), e.g., by welding or brazing. The chair legs, the longitudinal braces, and the crossbars are straight. The single front chair leg (22, 32) is inclined, for example, by 11.5 degrees backward. The respective rear chair leg (23, 33) is inclined, for example, by 22.5 degrees forward, while the respective longitudinal brace (24, 34) slopes backward and forms an angle of 7.5 degrees with the contact surface (1). The chair legs and the longitudinal brace of each two-legged element (21, 31) are made from a doubly bent tube. The bending radii on both sides of the respective longitudinal braces (24, 34) measure 25 mm.The two two-legged elements (21, 31) of a chair (10) are aligned parallel to each other.

[0017] The seat shell (15) sits on the frame (20) via an adapter (40) made of a possibly glass-fiber reinforced plastic. The adapter (40) is shown here as a two-part example only. It is divided into a right (41) and a left adapter assembly (42). Each adapter assembly (41, 42) consists of a lower part (43) and an upper part (44). The upper and lower parts (43, 44) together, and screwed together, e.g., between the crossbeams (28, 38), at least partially encircle the longitudinal struts (24, 34).

[0018] Each lower section (43) has an outer projection (47) that extends laterally outwards in the immediate vicinity of the respective front chair leg (22, 32) – for example, by 36.5 mm – beyond the two-legged element (21, 31). An upwardly projecting cantilever arm (48) is molded onto this lower section (43), to which an armrest (27, 37) is attached. The plane of the center lines of the armrest (27, 37) is, for example, 26 mm away from the plane of the center lines of the nearest two-legged element (21, 31).

[0019] In the outer end face of the outer projection (47) of the lower part (43), cf. chair side (3), a gripping body (72) is inserted as the central part of the negative interface (71) of the row connection system (60). The outer projection (47) has a corresponding recess (51) for this purpose, cf. Fig. 7. The handle body (72) is, for example, made of a metal investment casting. The material chosen is, for example, C45 or the stainless cast steel GX5CrNi19-10. Its end face, cf. Fig. 11. The flat surface located on the outer projection is glass bead blasted.

[0020] The gripping body (72) has the form of a trapezoidal, e.g. 3.5 mm thick front plate (73) with two rearward-projecting, e.g. 14 mm long mounting pins (74), cf. Fig. 10. Each mounting pin (74) has a through-hole (89). The mounting pins (74) taper their trapezoidal or rhomboidal cross-section with increasing distance from the front panel (73) at a casting angle of one degree. The short side walls of the front panel (73), which are oriented parallel to each other, form an angle of, for example, 82.5 degrees with the long side walls. The edges between the side walls are rounded with radii of 5.9 mm. A T-slot-shaped recess (75) is machined into the center of the front panel (73) from below. The lateral groove flanks (77, 78) of the recess (75) are aligned parallel to the short side walls of the front panel (73), while the upper groove flank (79) connecting both (77, 78) runs parallel to the long side walls. The recess (75) is, for example, 14 mm deep. The side groove flanks (77, 78) transition into the upper groove flank (79) with 2 mm radii.

[0021] Between the mounting pins (74), the back of the front panel (73) is recessed around the recess (75), for example by 1 mm. The width of the recess measures, for example, 2.5 mm. This flat recess forms the back flank (76) of the gripping body (72).

[0022] The gripping body (72) inserted into the recess (51) is held there by two threaded studs. The threaded studs are screwed into the base material of the lower part (43). They pass through the bores (89) of the gripping body (72).

[0023] In the outer end face of the outer projection (47) of the lower part (43), cf. chair side (4), a mushroom body (62) is inserted as an essential part of the positive interface (61) of the row connection system (60), cf. Fig. 7. The mushroom body (62), also made of a metal investment casting, sits in the outer projection (47) in a conical recess (56). It consists of a diamond-shaped head (63), a square (66), and a frustoconical shaft (67) with a transverse bore (68), cf. Fig. 8. The parallel outer walls of the 3.5 mm thick head (63) are, for example, 17.9 mm and 16.8 mm apart. The smaller rhombic angle is 82.5 degrees. The head (63) has, for example, a circumferential chamfer (64) between its radial outer walls and the free end face, which forms an angle of 30 degrees with the end face. Perpendicular to the end face, the chamfer (64) has a depth of 0.8 mm to overcome the locking mechanism of the row connection system (60) when the chairs are coupled together. In the center of the head (63) is a short cylindrical recess (65) that is 2 mm deep and has a diameter of 8.5 mm.

[0024] The square section (66) adjoining the head (63) is, for example, 6.6 mm deep. It has a width of, for example, 11.7 mm perpendicular to the direction of the dome movement. The shaft (67) has a diameter of, for example, 11 mm in the square section. It tapers towards its free end, which is, for example, 13 mm away from the square section (66). The cone angle is, for example, 4 degrees.

[0025] To fix the mushroom body (62) in the conical recess (56) of the lower part (43), the recess has a transverse bore into which a threaded pin passing through the transverse bore (68) of the shaft (67) is screwed.

[0026] Ua after Fig. 3 The lower part (43) has an inner projection (49) which is partially concealed by the actuating element (90). The locking mechanism (80) is housed in the area of ​​the inner and outer projections (47, 49). The locking mechanism (80) essentially consists of a spring-loaded locking piece (81) and the aforementioned actuating element (90). The locking piece (81) is a metallic cylindrical bolt which is slidably mounted in a guide bore (52) of the lower part (43). The guide bore (52) extends to Fig. 7 to the inner projection (49). There, the locking piece (81) is supported at the bottom of the bore by a helical compression spring (85). The latter is partially recessed in a rear central bore of the locking piece (81). The free, front end face of the locking piece (81), which projects into the T-slot-shaped recess (75) of the gripping body (72), has a 0.5 × 45° chamfer.

[0027] The locking piece (81) has a transverse bolt (82) which is pressed into a transverse bore of the locking piece (81), cf. Fig. 5. The center lines of the locking piece (81) and the transverse bolt (82) intersect. The locking piece (81) is linearly guided in the lower part (43) by means of the transverse bolt (82), preventing rotation. For this purpose, the lower part (43) has a downwardly pointing straight elongated hole (53), cf. Fig. 5 and Fig. 6, which is oriented parallel to the center line (69) of the blocking piece (81).

[0028] The midline of the block (81) and the midline of the mushroom body (62) lie parallel to the direction of the chair row (9), cf. Fig. 12. The guide slot (53) is positioned so that the locking piece (81) between the fastening pins (74) enters the recess (75) of the gripping body with its 0.5 × 45° chamfer into the area of ​​the 30° indentation chamfer (64) of the attachable mushroom head (63).

[0029] If the chair (13) is now raised approximately 2 cm at the front, see below. Fig. 12, with its negative interface (71) or with a gripping body (72) over the mushroom body (62), i.e., the positive interface (61), of the chair (12) standing on all chair legs, and set downwards by the dome offset (6), the 30° chamfer (64) of the mushroom head (63) pushes the locking piece (81) back over its 0.5 × 45° chamfer against the force of the locking spring (85). Now the mushroom head (63) can slide along between the end face of the locking piece (81) and the back flank (76) of the gripping body (72) until the upper groove flank (79) abuts the square (66) and pushes the locking piece (81) into the head recess (65) in a locking manner. Here the locking piece (81) and the mushroom body (62) are aligned with each other. The row connection is locked in a panic-proof manner.

[0030] Before the locking piece (81) penetrates the head recess (65), the mushroom head (63) is not only blocked in two mutually perpendicular directions by the contact of the square (66) with the groove flanks (77, 78, 79) of the recess (75) of the gripping body, and by the axial clamping of the mushroom head (63) between the end face of the outer projection (47) and the rear flank (76) of the gripping body (72), but has also lost its three degrees of rotational freedom. It could only be moved in the direction of the dome offset – e.g., by lifting the chair (13). It is precisely this linear degree of freedom that is eliminated by the locking piece (81), which extends automatically by spring force.

[0031] To release the locked series connection, the actuating element (90) is moved to Fig. 3. The actuating element (90) is pivoted by a few degrees counterclockwise. The actuating element (90) is a plastic lever (91) which has a bearing bore (93) at the rear to form a pivot joint and an operating paddle (92) at the front. A cam groove (97) is machined into the lever (91) between the bearing bore (93) and the operating paddle (92), into which the transverse bolt (82) on the locking side engages. The cam groove (97) is oriented, for example, parallel to the longitudinal extent of the actuating element. A deviation of ± 30 degrees from this orientation is easily permissible. Fig. 6 The underside of the actuating element (90) has an axial bearing protrusion (94) several tenths of a millimeter high around the bearing bore. In addition, a support rib (95) is located at the rear end of the lever (91) over which the actuating element (90) slides along the underside of the lower part (43).

[0032] The center of the diamond-shaped control paddle (92) is located approximately 90 mm behind and approximately 15 mm below the front edge of the seat (18) and approximately 25 mm next to the respective right front chair leg (22), so that when uncoupling the row connection the control paddle (92) can easily be felt with the fingers of the right hand and swiveled to the left. Reference symbol list: 1. Footprint, ground footprint 3 Chair side, right 4 Chair side, left 6 Dome offset 9 Chair row direction 10, 11 dome chairs, stacked; stacking chairs 12, 13 dome chairs, coupled: left, right; stacking chairs 14 Structure 15 seat shell 16 seats, seating area 17 Seat underside 18 Front edge 19 Backrest 20 frame, tubular frame 21 Bipedal element, right 22 Chair leg, front right 23 Chair leg, rear right 24 Longitudinal strut, right 27 Armrest, right 28 Cross member, front 31 Bipedal element, left 32 Chair leg, front left 33 Chair leg, rear left 34 Longitudinal strut, left 37 Armrest, left 38 Cross member, rear 40 adapters between (28) and (38) 41 Adapter assembly, right 42 Adapter assembly, left 43 Lower part 44 Top 45 Underside of the lower part 46 Middle section 47 Outside lead 48 Cantilever 49 Inside projection 51 Recess in the outer projection, for (72) 52 Guide hole, locking hole 53 Guide slot 56 Recess, conical, for (62) 60 series connection system 61 positive interface 62 mushroom bodies 63 Head, diamond-shaped, mushroom head 64 Indentation 65 Head recess 66 square, irregular 67 shaft 68 Cross bore 69 Midline of (62) and (81) 71 negative interface 72 Handle bodies 73 Front panel 74 fastening pins 75 Recess, T-slot shaped 76 Back flank 77 Groove flank, front and side 78 Groove flank, rear and side 79 Groove flank, top 80 Locking mechanism 81 Locking piece, bolt 82 cross bolts 85 Locking spring, coil compression spring 89 through holes for (74) 90 Actuating element, paddle-like 91 levers 92 Control paddles, lever actuation element 93 bearing bore 94 Axial bearing elevation 95 Support bridge 97 Joint, cam groove, slotted hole 99 Lever pivot axis

Claims

Dome chair with a frame (20) and a seatable structure (14) mounted thereon via at least one adapter (40), and with a row connection system (60) which has a positive (61) or negative interface (71) per chair side (3, 4), wherein the adapter (40) has an adapter assembly (41, 42) per chair side (3, 4), wherein a positive (61) or negative interface (71) is arranged in each adapter assembly (41, 42).- wherein the negative interface (71) of a first chair can be coupled to the positive interface (61) of a second chair by means of a positive coupling offset (6) - while locking two linear and three rotational degrees of freedom - and- wherein, to lock the third linear degree of freedom, a directly or indirectly actuated - self-locking - locking piece (81) limits or locks the negative coupling offset (6) and- wherein the positive interface (61) is a T-nut-like mushroom body (62) with a central head recess (65), while the negative interface (71) is a gripping body (72) with a T-slot-shaped recess (75), wherein the locking piece (81) can be inserted into the head recess (65) for locking. Dome chair according to claim 1, characterized in that the dome offset (6) is linear and runs perpendicularly ± 30 degrees to the ground contact surface (1). Dome chair according to claim 1, characterized in that the locking piece (81) is movable parallel to the direction of the row of chairs (9). Dome chair according to claim 1, characterized in that the locking piece (81) can be brought into the locking position by means of spring force. Dome chair according to claim 1, characterized in that the locking piece (81) can be unlocked via a lever mechanism (90, 91, 97, 99). Dome chair according to claim 5, characterized in that a pivot joint ( 97) at the lever (91) of the lever mechanism (90, 91, 97, 99) is located between a lever pivot axis ( 99) and a lever actuating element ( 92). Dome chair according to claim 6, characterized in that the lever actuating element (92) is arranged near a right chair leg (22) below a seat surface. Dome chair according to claim 1, characterized in that a center line ( 69) of the interface (71) equipped with the locking piece (81) has a shortest horizontal distance to the nearest front chair leg (22) which is less than one tenth of the depth of the base surface spanned by the chair leg contact points. Dome chair according to one of claims 1 or 2, characterized in that the structure (14) is a one-piece seat shell (15) consisting of a seat (16) and a backrest (19).

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