Arrangement for connecting a chair back and a seat

Abstract

Arrangement for connecting a chair back and a seat, comprising: a seat support (1) which is provided with a mounting groove (11), wherein an opening (12) is formed at the rear end of the mounting groove (11), and wherein the mounting groove (11) has two opposing boundary walls, each of which is provided with a locking slot (13), and wherein the two locking slots (13) are positionally aligned; and a backrest support (2) provided with a connecting section (21) which engages in the mounting groove (11) through the opening (12) of the mounting groove (11) of the seat support (1), wherein the connecting section (21) is provided with a transverse receiving hole (22) in which an elastic element (23) is located, and wherein a locking pin (24) is arranged at each of the two ends of the elastic element (23), the two locking pins (24) being supported at the two ends of the elastic element (23), and wherein the connecting section (21) forms opposing upper and lower surfaces, and wherein the connecting section (21) is provided on its lower side with a guide groove (25), and wherein two transverse guide holes (251) are provided at the top of the guide groove (25) which communicate with the receiving hole (22), and wherein a projection (241) is connected to the lower side of each of the two locking pins (24) and is made of protrudes from the two transverse guide holes (251),and wherein an actuating element (26) is located inside the guide groove (25), which is provided with a grip section (261), and wherein a longitudinal slot (262) is formed in the center of the actuating element (26), and wherein a brake hole (263) is located on each side of the longitudinal slot (262), and wherein a first receiving section (264) and a second receiving section (265) are arranged at both ends of the brake hole (263), and wherein a release section (266) is provided between the first receiving section (264) and the second receiving section (265), and wherein the extensions (241) of the two locking pins (24) are each positioned in the two brake holes (263) and serve to engage and disengage the two locking pins (24) from the detent slots (13) formed on the two boundary walls of the mounting groove (11) of the seat support (1). let,and wherein a fastening element (27) extends through the longitudinal slot (262) of the actuating element (26) and is screwed into the connecting section (21), and wherein the fastening element (27) has a head section (271) which rests against the bottom side of the actuating element (26).

Description

[Technical field]

[0001] The invention relates to an arrangement for connecting a chair back and a seat, in particular a structure by which the seat support and the back support can be easily connected, avoiding the unexpected detachment of the seat support and the back support while sitting. [State of the art]

[0002] From DE 10 2020 122 486 A1 an arrangement for quickly connecting a seat back and a seat is known, wherein a seat base with a first connecting section and a seat back support with a second connecting section are provided.

[0003] DE 20 2006 007 719 U1 relates to a chair, in particular a design of a chair in which the connecting part of the chair back is provided with a structure of an elastic support arrangement.

[0004] From US patent 2019 / 0313802A1, an ergonomic chair is known that comprises a back component and a seat component. The back component includes an upper back support, a lower back support, a backrest frame that deforms elastically under tension or compression, and a locking mechanism to hold the positions of the three aforementioned components relatively firmly.

[0005] US Patent 8,777,305 B1 describes a multifunctional chair that can transform from an office chair into a floor rocker and a stool. The floor rocker is detachable from a base that can be used as a stool.

[0006] US Patent 6,948,778 B1 discloses a removable folding seat arrangement for a motor vehicle comprising a folding seat and a support structure for the folding seat.

[0007] A chair with a quick-release backrest coupling device is known from WO 2004 / 082 435 A1. The chair has a backrest support arranged below the seat with a receiving space open at the top and rear, into which a fastening section of a backrest coupling piece can be positively inserted. [Purpose of the invention]

[0008] The invention is based on the objective of creating an arrangement for connecting a chair back and a seat surface, by which the seat support and the backrest support can be easily connected, while avoiding the unexpected detachment of the seat support and the backrest support while sitting.

[0009] This problem is solved according to the invention by an arrangement for connecting a chair back and a seat, which has the features specified in claim 1. Further advantageous embodiments of the invention are described in the dependent claims. [Brief description of the drawings]

[0010] The invention and its embodiments are explained in more detail below with reference to the drawings. The drawings show: Fig. 1 a perspective exploded view of an embodiment of an arrangement according to the invention; Fig. 2 a perspective exploded view of an embodiment of an arrangement according to the invention seen from another side; Fig. 3 a top view of an embodiment of an arrangement according to the invention; Fig. 4 a section through an exemplary embodiment of an arrangement according to the invention; Fig. 5 a bottom view I of the partial construction of the arrangement according to the invention in the assembled state; Fig. 6 a section I through the embodiment of an arrangement according to the invention in the assembled state; Fig. 7 a bottom view II of the partial construction of the arrangement according to the invention in the assembled state; Fig. 8 an enlarged sectional view of the partial construction of the arrangement according to the invention in the assembled state; Fig. 9 a section II through the embodiment of an arrangement according to the invention in the assembled state; Fig. 10 a perspective view I of the embodiment of an arrangement according to the invention in the assembled state; Fig. 11 a top view of the embodiment of an arrangement according to the invention in the assembled state; Fig. 12 a perspective view II of the embodiment of an arrangement according to the invention in the assembled state; Fig. 13 a section through an embodiment of an arrangement according to the invention in its disassembled state; and Fig. 14 a bottom view of the partial construction of the arrangement according to the invention in the disassembled state. [Explanation of the preferred embodiment]

[0011] As from the Fig. 1 to Fig. As can be seen in Figure 4, an arrangement according to the invention for connecting a chair back and a seat surface has a seat support 1 and a back support 2.

[0012] The seat support 1 is U-shaped and provided with a mounting groove 11. An opening 12 is formed at the rear end of the mounting groove 11. The mounting groove 11 has two opposing end walls, each provided with a locking slot 13. The two locking slots 13 are aligned in position. A stop 14 extends from the upper end of each of the two end walls of the mounting groove 11 towards the mounting groove 11. The two stops 14 are aligned in position. A transverse support rod 15 is provided at the upper end of the mounting groove 11, both ends of which are connected to the respective end walls of the mounting groove 11. The mounting groove 11 has a through-hole 16 on its bottom side.

[0013] The backrest support 2 is L-shaped. At its end, the backrest support 2 has a connecting section 21 that engages in the mounting groove 11 through the opening 12. The connecting section 21 has a transverse receiving hole 22 in which an elastic element 23 is located. A locking pin 24 is arranged at each end of the elastic element 23, with the two locking pins 24 bearing against the two ends of the elastic element 23. The connecting section 21 also forms opposing upper and lower surfaces. The bottom of the connecting section 21 has a guide groove 25. Two projections 211 are formed on the bottom of the connecting section 21, which are arranged on both boundary sides of the guide groove 25 and bear against the bottom side of the mounting groove 11 of the seat support 1.The bottom side of the connecting section 21 is formed with a guide chamfer 212, which is gradually inclined from the projection 211 to the front end of the connecting section 21. Furthermore, two transverse guide holes 251 are provided at the top of the guide groove 25, which communicate with the receiving hole 22. A projection 241 is connected to the underside of each of the two locking pins 24 and extends from the two transverse guide holes 251. A cut surface 242 is formed on the upper side of each of the two locking pins 24. Inside the guide groove 25 is an actuating element 26, which is provided at its rear end with a grip section 261. A longitudinal slot 262, extending from front to rear, is formed in the center of the actuating element 26, with a brake hole 263, shaped as an isosceles triangle, located on each side of the longitudinal slot 262. The brake hole 263 has three end caps that are rounded.At the first and second end caps formed at the front and rear ends of the brake hole 263, a first receiving section 264 and a second receiving section 265 are arranged. A release section 266 is also formed at the third end cap of the brake hole 263, located between the first receiving section 264 and the second receiving section 265. The projections 241 of the two locking pins 24 are each positioned in the two brake holes 263 and serve to engage and disengage the two locking pins 24 from the detent slots 13 formed on the two boundary walls of the mounting groove 11 of the seat support 1. A fastening element 27 is also provided, which extends through the longitudinal slot 262 of the actuating element 26 and is screwed into the connecting section 21. The fastening element 27 has a head section 271 which rests against the bottom side of the actuating element 26.A groove 28 is formed transversely on the upper surface of the connecting section 21, in which the support rod 15 of the seat support 1 is positioned. A recess 29 is formed on each side of the upper surface of the connecting section 21, into which the respective stop piece 14 arranged on both sides of the mounting groove 11 engages.

[0014] Before the product according to the invention leaves the manufacturing plant, the actuating element 26 is pulled forward by personnel. This causes the extensions 241 of the two locking pins 24 located in the two brake holes 263 of the actuating element 26 to move from the release sections 266 of the two brake holes 263 of the actuating element 26 towards the second receiving sections 265 located at the rear end of the brake holes 263 [see Fig. 5]. When the extensions 241 of the two locking pins 24 move along the brake holes 263 to the rear, second receiving sections 265, the two locking pins 24 are locked so that they engage in the receiving hole 22 of the connecting section 21. In this case, the elastic element 23 between the two locking pins 24 is in the compressed state.

[0015] If a consumer wishes to assemble the backrest support 2 and the seat support 1 after purchasing the product according to the invention, they can hold the backrest support 2 with both hands to insert the connecting section 21 of the backrest support 2 into the opening 12 of the mounting groove 11 of the seat support 1. The design of the guide chamfer 212 at the front end of the connecting section 21 allows for smooth insertion of the connecting section 21 into the mounting groove 11. Furthermore, the stop pieces 14 provided on the upper two sides of the mounting groove 11, together with the base of the mounting groove 11, can form a guide rail to ensure low-friction insertion of the connecting section 21 into the mounting groove 11.When the handle section 261 of the actuating element 26 on the bottom side of the connecting section 21 comes into contact with the opening 12 of the mounting groove 11, and when the connecting section 21 is continuously inserted into the mounting groove 11, the handle section 261 of the actuating element 26 is pushed backwards relative to the opening 12 of the mounting groove 11 in order to push the actuating element 26 backwards into its initial position.

[0016] The following will be discussed Fig. 7. The extensions 241 of the two locking pins 24 move along the two brake holes 263 of the actuating element 26, starting from the second receiving sections 265 located at the rear end of the two brake holes 263 and moving forward towards the release section 266. When the two locking pins 24 reach the release sections 266, the elastic element 23 pressed between the two locking pins 24 can be released. In this way, as described in Fig. As shown in Figure 8, the two locking pins 24 are pushed out of the receiving hole 22 of the connecting section 21 at their ends so that they engage in the respective detent slots 13 formed on the two limiting sides of the mounting groove 11. The guide provided by the cutting surface 242 on the top of the locking pin 24 allows the locking pin 24 to be inserted more smoothly into the detent slot 13. The head section 271 of the fastening element 27 of the connecting section 21 is, as shown in Fig. 9 and Fig. As shown in Figure 10, the connecting section 21 is aligned with the through hole 16 formed on the bottom side of the mounting groove 11, so that the bottom side of the connecting section 21 is in close contact with the bottom side of the mounting groove 11. The projection 211 provided on the bottom side of the connecting section 21 is used to reduce the connection tolerance between the mounting groove 11 and the connecting section 21, so that the connecting section 21 and the mounting groove 11 form a stable connection.

[0017] When the locking pins 24 arranged on both sides of the connecting section 21 engage in the detent slots 13 formed on the two limiting sides of the mounting groove 11, the stop pieces 14 arranged on both sides of the upper end of the mounting groove 11 simultaneously engage positively in the recesses 29 formed on both sides of the upper surface of the connecting section 21 [see Fig. 11 and Fig. 12]. Furthermore, the support rod 15, which extends transversely at the upper end of the mounting groove 11, engages in a form-fitting manner in the embedding groove 28 arranged transversely on the upper surface of the connecting section 21. In this way, the assembly of the backrest support 2 and the seat support 1 of the present invention can be completed simply and quickly. The design of the aforementioned form-fitting connections of the present invention prevents the screws from unexpectedly loosening while sitting, as is usually the case with the conventional screw connection of the chair backrest and the seat.The positive engagement of the stop pieces 14, arranged on both sides of the mounting groove 11, into the recesses 29 formed on both sides of the upper surface of the connecting section 21, and the positive engagement of the support rod 15 of the seat support 1 into the embedding groove 28 arranged on the upper surface of the connecting section 21, furthermore prevents the chair back from unexpectedly tipping when users repeatedly lean on it. This significantly increases seating safety.

[0018] It will then be on Fig. 13 and Fig.14 Reference is made to this. If the arrangement according to the invention is replaced or repaired in the future, the operator can hold the handle section 261 of the actuating element 26 attached to the connecting section 21 of the backrest support 2 in order to retract the actuating element 26. At this point, the extensions 241 of the two locking pins 24 are moved from the respective release sections 266 of the two brake holes 263 to the first receiving sections 264 located at the front end of the actuating element 26. As they are moved to the first receiving sections 264 located at the front end, the two locking pins 24 are retracted into the receiving hole 22 of the connecting section 21, so that they disengage from the detent slots 13 formed on both sides of the seat support 1.Then the connecting section 21 of the backrest support 2 can be pulled out of the mounting groove 11 of the seat support 1 in order to separate the connecting section 21 of the backrest support 2 from the mounting groove 11 of the seat support 1. This allows for quick assembly and disassembly.

Claims

[1] Arrangement for connecting a chair back and a seat, comprising: a seat support (1) which is provided with a mounting groove (11), wherein an opening (12) is formed at the rear end of the mounting groove (11), and wherein the mounting groove (11) has two opposing boundary walls, each of which is provided with a locking slot (13), and wherein the two locking slots (13) are positionally aligned; and a backrest support (2) provided with a connecting section (21) which engages in the mounting groove (11) through the opening (12) of the mounting groove (11) of the seat support (1), wherein the connecting section (21) is provided with a transverse receiving hole (22) in which an elastic element (23) is located, and wherein a locking pin (24) is arranged at each of the two ends of the elastic element (23), the two locking pins (24) being supported at the two ends of the elastic element (23), and wherein the connecting section (21) forms opposing upper and lower surfaces, and wherein the connecting section (21) is provided on its lower side with a guide groove (25), and wherein two transverse guide holes (251) are provided at the top of the guide groove (25) which communicate with the receiving hole (22), and wherein a projection (241) is connected to the lower side of each of the two locking pins (24) and is made of protrudes from the two transverse guide holes (251),and wherein an actuating element (26) is located inside the guide groove (25), which is provided with a grip section (261), and wherein a longitudinal slot (262) is formed in the center of the actuating element (26), and wherein a brake hole (263) is located on each side of the longitudinal slot (262), and wherein a first receiving section (264) and a second receiving section (265) are arranged at both ends of the brake hole (263), and wherein a release section (266) is provided between the first receiving section (264) and the second receiving section (265), and wherein the extensions (241) of the two locking pins (24) are each positioned in the two brake holes (263) and serve to engage and disengage the two locking pins (24) from the detent slots (13) formed on the two boundary walls of the mounting groove (11) of the seat support (1). let,and wherein a fastening element (27) extends through the longitudinal slot (262) of the actuating element (26) and is screwed into the connecting section (21), and wherein the fastening element (27) has a head section (271) which rests against the bottom side of the actuating element (26). [2] Arrangement for connecting a chair back and a seat according to claim 1, characterized by , that the locking slot (13) of the seat carrier (1) is elongated, wherein a cut surface (242) is formed on the upper side of the two locking pins (24) of the connecting section (21), wherein the locking pins (24) engage in the respective locking slots (13). [3] Arrangement for connecting a chair back and a seat according to claim 1, characterized by, that a stop piece (14) extends from the upper end of the two boundary walls of the mounting groove (11) in the direction of the mounting groove (11), wherein the two stops (14) are positionally aligned, wherein a recess (29) is formed on each side of the upper surface of the connecting section (21), into which the respective stop piece (14) arranged on both sides of the mounting groove (11) engages. [4] Arrangement for connecting a chair back and a seat according to claim 1, characterized by , that a transverse support rod (15) is provided at the upper end of the mounting groove (11), the two ends of which are connected to the respective boundary walls of the mounting groove (11), and wherein an embedding groove (28) is formed transversely on the upper surface of the connecting section (21) of the backrest support (2), in which the support rod (15) of the seat support (1) is positioned. [5] Arrangement for connecting a chair back and a seat according to claim 1, characterized by , that on the bottom side of the connecting section (21) of the backrest support (2) two projections (211) are formed, which are arranged on both limiting sides of the guide groove (25) and abut against the bottom side of the mounting groove (11) of the seat support (1). [6] Arrangement for connecting a chair back and a seat according to claim 5, characterized by , that the bottom side of the connecting section (21) is formed with a guide slope (212) which is inclined from the projection (211) to the end section of the connecting section (21). [7] Arrangement for connecting a chair back and a seat surface according to claim 1, characterized by, that the seat support (1) is provided with a through hole (16) on the bottom side of the mounting groove (11), wherein the head section (271) of the fastening element (27) of the connecting section (21) of the backrest support (2) is aligned with the through hole (16) formed on the bottom side of the mounting groove (11). [8] Arrangement for connecting a chair back and a seat according to claim 1, characterized by , that the brake hole (263) of the actuating element (26) is formed as an isosceles triangle, wherein the brake hole (263) has three end corners which are rounded, and wherein the brake hole (263) is formed at the first and second end corners with a first receiving section (264) and a second receiving section (265), and wherein a release section (266) is formed at the third end corner of the brake hole (263).

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