Patent Application
20240315451
The present invention relates to a chair, and more particularly to a flexible support device for a chair back tilting.
A conventional office chair has a back which is adjustably tilted by using at least one spring defined between the back and a seat. However, the at least one spring will cause a fatigue after a period of using time. A conventional flexible support device for a chair back tilting are disclose in U.S. Pat. Nos. 9,414,681 and 10,376,066, but the chair back is tilted by using at least one spring made of metal. Also, at least one pull stud is configured to pull the at least one spring and is made of metal, thus causing noises, heavy weight, high fabrication cost, and using fatigue.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The primary aspect of the present invention is to provide a flexible support device for a chair back tilting which is capable of overcoming a fatigue and noises of the spring.
Another aspect of the present invention is to provide a flexible support device for a chair back tilting which contains the flexible sheet to obtain light weight and low fabrication cost
The supporting frame includes a back portion formed on a rear end of the supporting frame, two peripheral extensions extending from two sides of a bottom of the back portion, two rotatable tabs oppositely extending from the two peripheral extensions, two through orifices defined on the two rotatable tabs, two rotatable edges formed on two distal ends of the two peripheral extensions, two first coupling orifices defined on the two rotatable edges, and two second coupling orifices formed proximate to the two first coupling orifices.
The seat mounting includes a first fixing portion and a second fixing portion opposite to the first fixing portion, two connecting fences connected with two sides of the first fixing portion and the second fixing portion, two rotatable locating portions formed on the two sides of the second fixing portion, two defining orifices defined on the two rotatable locating portions and corresponding to the two through orifices of the supporting frame, two joining elements configured to connect with the two through orifices of the supporting frame via the two defining orifices of the seat mounting, two slide orifices defined on two inner walls of the two connecting fences adjacent to the first fixing portion, and a drive protrusion extending to the second fixing portion from a center of an inner wall of the first fixing portion.
The base includes two locating fringes with two first positioning orifices corresponding to the two first coupling orifices of the supporting frame, two second positioning orifices corresponding to the two second coupling orifices of the supporting frame, such that the two first coupling orifices and the two second coupling orifices of the supporting frame are connected with the two first positioning orifices and the two second positioning orifices by using two first screw bolts and two second screw bolts; the base further includes a holder extending from a center of a front end thereof and connected with a first end of a spring, and a second end of the spring being connected with a center of a first side of a flexible sheet.
The flexible sheet has two peripheral sections formed on two sides thereof and accommodated in two receiving grooves of two connectors, the base further includes two connection segments corresponding to the two connectors, wherein the two connection segments have two openings, and the two connectors have two pegs extending therefrom and corresponding to the two openings so that the two pegs of the two connectors are connected with the two openings of the two connection segments, and the two peripheral sections of the flexible sheet are fixed on the two connection segments, thus fixing the flexible sheet.
The two connection segments have two shafts extending from two outer walls thereof and slidably received in the two slide orifices of the seat mounting, and a center of a second side of the flexible sheet opposite to the spring is biased against the drive protrusion of the seat mounting.
Referring to
The supporting frame 10 includes a back portion 11 formed on a rear end thereof, two peripheral extensions 12 extending from two sides of a bottom of the back portion 11, two rotatable tabs 13 oppositely extending from the two peripheral extensions 12, two through orifices 14 defined on the two rotatable tabs 13, two rotatable edges 15 formed on two distal ends of the two peripheral extensions 12, two first coupling orifices 17 defined on the two rotatable edges 15, and two second coupling orifices 16 formed proximate to the two first coupling orifices 17.
The seat mounting 20 includes a first fixing portion 27 and a second fixing portion 22 opposite to the first fixing portion 27, two connecting fences 21 connected with two sides of the first fixing portion 27 and the second fixing portion 22, two rotatable locating portions 23 formed on the two sides of the second fixing portion 22, two defining orifices 24 defined on the two rotatable locating portions 23 and corresponding to the two through orifices 14 of the supporting frame 10, two joining elements 25 configured to connect with the two through orifices 14 of the supporting frame 10 via the two defining orifices 24 of the seat mounting 20, two slide orifices 26 defined on two inner walls of the two connecting fences 21 adjacent to the first fixing portion 27, and a drive protrusion 28 extending to the second fixing portion 22 from a center of an inner wall of the first fixing portion 27.
The base 30 includes two locating fringes 38 with two first positioning orifices 382 corresponding to the two first coupling orifices 17 of the supporting frame 10, two second positioning orifices 381 corresponding to the two second coupling orifices 16 of the supporting frame 10, such that the two first coupling orifices 17 and the two second coupling orifices 18 of the supporting frame 10 are connected with the two first positioning orifices 382 and the two second positioning orifices 381 by using two first screw bolts 19 and two second screw bolts 18.
The base 30 further includes a holder 31 extending from a center of a front end thereof and connected with a first end of a spring 35, and a second end of the spring 35 is connected with a center of a first side of a flexible sheet 37.
The first end of the spring 35 is fitted with a first fitting sleeve 34, and the second end of the spring 35 is fitted with a second fitting sleeve 36, wherein the first fitting sleeve 34 has a first passing orifice 341 defined on a center thereof, and the holder 31 has a second passing orifice 312 corresponding to the first passing orifice 341, such that the second passing orifice 312 and the first passing orifice 341 are connected with a first threaded post 341 to support the first end of the spring 35 to connect with the holder 31 of the base 30. The second fitting sleeve 36 has a third passing orifice 361 defined on a center thereof, and the flexible sheet 37 has a screw portion 372 corresponding to the third passing orifice 361, such that the screw portion 372 and the second passing orifice 361 are connected with a second threaded post 362 to support the second end of the spring 35 to connect with the center of the flexible sheet 37.
The flexible sheet 37 has two peripheral sections 371 formed on two sides thereof and accommodated in two receiving grooves 332 of two connectors 33, the base 30 further includes two connection segments 32 corresponding to the two connectors 33, wherein the two connection segments 32 have two openings 321, and the two connectors 33 have two pegs 333 extending therefrom and corresponding to the two openings 321 so that the two pegs 333 of the two connectors 33 are connected with the two openings 321 of the two connection segments 32, and the two peripheral sections 371 of the flexible sheet 37 are fixed on the two connection segments 32, thus fixing the flexible sheet 37. The two connection segments 32 have two shafts 322 extending from two outer walls thereof and slidably received in the two slide orifices 26 of the seat mounting 20. A center of a second side of the flexible sheet 37 opposite to the spring 35 is biased against the drive protrusion 28 of the seat mounting 20.
Preferably, the flexible sheet 37 is made of plastic or carbon fiber to reduce a fabrication cost.
Preferably, two connectors 33 have two stop fringes 331 extending from two sides thereof to avoid a removal of the flexible sheet 40.
Preferably, the two second coupling orifices 16 of the supporting frame 10 are elongated to provide a margin of the chair back tilting.
Preferably, the two shafts 322 of the base 30 have two sheathes 323 with two apertures 3231 fitted on the two shafts 322 so as to reduce a friction of the two shafts 322 of the base 30 or the two slide orifices 26 of the seat mounting 20, when the two shafts 322 contact with the two slide orifices 26.
Referring to
As shown in
Thereby, the flexible support device is pressed by the drive protrusion 28 of the seat mounting 20 and the spring 35 to overcome a fatigue and noises of the spring 35. Also, the flexible sheet 37 is lightweight and produced at low cost.
While the first embodiments of the invention have been set forth for the purpose of disclosure, modifications of the disclosed embodiments of the invention as well as other embodiments thereof may occur to those skilled in the art. The scope of the claims should not be limited by the first embodiments set forth in the examples, but should be given the broadest interpretation consistent with the description as a whole.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2023205741654 | Mar 2023 | CN | national |
