EP3738474B1 - Device for adjusting the degree of inclination of the seat of a chair - Google Patents

Device for adjusting the degree of inclination of the seat of a chair Download PDF

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Publication number
EP3738474B1
EP3738474B1 EP20171504.2A EP20171504A EP3738474B1 EP 3738474 B1 EP3738474 B1 EP 3738474B1 EP 20171504 A EP20171504 A EP 20171504A EP 3738474 B1 EP3738474 B1 EP 3738474B1
Authority
EP
European Patent Office
Prior art keywords
pair
wings
dampers
plate
seat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20171504.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3738474A1 (en
Inventor
Michael DE MARTIN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
OMS SpA
Original Assignee
OMS SpA
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Filing date
Publication date
Priority claimed from IT102019000006798A external-priority patent/IT201900006798A1/it
Priority claimed from IT102020000002200A external-priority patent/IT202000002200A1/it
Application filed by OMS SpA filed Critical OMS SpA
Publication of EP3738474A1 publication Critical patent/EP3738474A1/en
Application granted granted Critical
Publication of EP3738474B1 publication Critical patent/EP3738474B1/en
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C7/00—Parts, details, or accessories of chairs or stools
    • A47C7/02—Seat parts
    • A47C7/14—Seat parts of adjustable shape; elastically mounted ; adaptable to a user contour or ergonomic seating positions

Definitions

  • the present invention relates to a device for adjusting the degree of inclination or tilt of the seat of a chair.
  • the vulcanization or the overmolding generate composite components that are difficult to handle at the end of life of the product.
  • the adjustment of the degree of inclination or tilt of the chair is furthermore very limited and cannot be customized as a function of the requirements of the user.
  • the aim of the present application is to solve the above mentioned technical problems, eliminating the drawbacks in the cited known art, by providing a device that makes it possible for a chair to be inclined along all directions of the thrust plane to a desired degree, as a function of the requirements of the user.
  • an object of the invention is to provide a device that, in addition to the foregoing characteristic, adds that of being capable of making the thrust plane tilt in all directions for seats, backrests or monocoque chairs, howsoever provided.
  • Another object of the invention is to provide a device that at the same time makes it possible to preset the degree of freedom of movement of the chair according to requirements, both in terms of breadth of movement, and in terms of resistance to movement.
  • Another object of the invention is to obtain a device that allows rapid and easy assembly, even when using metallic detailed parts that are zinc-plated, chrome-plated or painted, or sheets preferably in carbon steel, which may be contoured and deformed and normally powder coated.
  • Another object of the invention is to provide a device that can be removed, replaced and disposed of rapidly and easily.
  • Another object of the invention is to provide a device that makes it possible to achieve, simply and effectively, an end-of-stroke condition of the inclination that can be assumed by the chair.
  • Another object of the invention is to provide a device that makes it possible for the chair to tilt in all directions of the thrust plane, while its components remain in an optimal position during their actuation.
  • Another object of the invention is to obtain a device that is structurally robust, that does not require maintenance and that can be made with the usual conventional machinery and/or plants.
  • the reference numeral 1 generally designates a device for adjusting the degree of inclination of a seat of a chair (not shown) which is constituted by a box-like element 2 which is composed of a polygonal, preferably square flat base 3 which has a first axial hole 4.
  • first wings 5a, 5b, 5c, 5d protrude at right angles and are substantially L-shaped so as to define wings 6a, 6b, 6c, 6d which are directed toward the outside of the flat base 3.
  • At least one second hole is provided on each one of the second wings 6a, 6b, 6c, 6d and is designated in the first embodiment with the reference numerals 7a, 7b, 7c, 7d, and is a receptacle for adapted rivets or screws or bolts 8a, 8b, 8c, 8d for the mechanical coupling of the box-like element 2 below the flat bottom 9 of a plate 10 which has a third axial hole 11 and fourth holes 12a, 12b, 12c, 12d which are provided at the second holes 7a, 7b, 7c, 7d.
  • the plate 10 can in turn be associated below the seat (not shown) of a chair, and is frustum-shaped so as to define a first receptacle 13 for accommodating adapted and conventional mechanisms, such as, for example, a lever 14 which is adapted to interact with a gas-operated post 15.
  • a pair of flat dampers 18a, 18b are arranged between the lower first surface 16 of the flat bottom 9 of the plate 10 and the upper first surface 17 of the flat base 3, and constitute a damper preferably made of PU or TPU thermoplastic elastomer.
  • Each component of the pair of dampers 18a, 18b has a plan shape that is substantially complementary to the flat bottom 9 and to the flat base 3 and is provided with a fourth hole 19a, 19b for the passage of the gas-operated post 15.
  • Adjustment means 20 are interposed between the pair of flat dampers 18a, 18b for adjusting the stroke limit of the inclination of the seat of the chair with respect to the flat base 3 along diametrical planes, the means being constituted by a flat platelet 21, which has a plan shape that is adapted to contain and support the pair of dampers 18a, 18b, and from which second wings 22a, 22b, 22c, 22d protrude perimetrically and in the direction of the plate 10, which have different heights and which constitute a stroke limit with the lower first surface 16 of the flat bottom 9 of the plate 10 following the deformation that can be imparted to the pair of dampers 18a, 18b as a consequence of the inclination of the chair.
  • Such heights can be variously determined; for example the second wings 22a and 22b, 22c, 22d can constitute respectively the lowest and highest stroke limit that can be achieved as a consequence of the inclination of the chair.
  • the second wings 22a, 22b may or may not have the same height as the second wings 22c, 22d.
  • the second wings 22a, 22b can have the same height and be higher than the second wings 22c, 22d.
  • the second wing 22a is higher than the second wings 22b, 22c, 22d.
  • the height of the second wings 22a, 22b, 22c, 22d can therefore vary as a function of specific requirements.
  • An axial sleeve 23 is present axially with respect to the platelet 21 and is a receptacle for the gas-operated post 15.
  • a substantially frustum-shaped first surface 24, open in an upward region, extends upward, from the free end of which, on the same plane, second wings 6a, 6b, 6c, 6d protrude which are directed toward the outside of the flat base 3.
  • a pair of second holes 7a, 7b, 7c, 7d is provided, which are receptacles for adapted rivets and/or screws and/or bolts 8a, 8b, 8c, 8d, 8e, 8f, 8g, 8h for the mechanical coupling of the box-like element 2 below the frustum-shaped plate 10 with a flat bottom 9 on which a third axial hole 11 is provided.
  • a substantially frustum-shaped second surface 25 open in an upward region, extends upward, from the free end of which, on the same plane, third wings 26a, 26b, 26c, 26d protrude which are directed toward the outside of the plate 10.
  • the perimetric space occupation of the second wings 6a, 6b, 6c, 6d of the box-like element 2 and of the third wings 26a, 26b, 26c, 26d of the plate 10 is identical, with the plate 10 penetrating slightly into the box-like element 2.
  • the first receptacle 13 for accommodating adapted and conventional mechanisms such as, for example, the lever 14 which is adapted to interact with the gas-operated post 15.
  • a pair of flat dampers 18a, 18b are arranged between the lower first surface 16 of the flat bottom 9 of the plate 10 and the upper first surface 17 of the flat base 3, and constitute a damper preferably made of elastomer obtained by cast molding or by injection molding or by vulcanization or by compression molding.
  • Each element that makes up the pair of dampers 18a, 18b has a polygonal plan shape, preferably square-based and has a fourth hole 19a, 19b for the passage of the gas-operated post 15, while adjustment means 20 are interposed between the pair of flat dampers 18a, 18b for adjusting the stroke limit of the inclination of the chair with respect to the flat base 3 along diametrical planes, such means being constituted by a flat platelet 21, which has a plan shape that is adapted to perimetrically support and contain the pair of dampers 18a, 18b, an axial sleeve 23 also being present axially with respect to the platelet 21 and being a receptacle for the gas-operated post 15.
  • a series of spokes 28 protrude radially from the sleeve 23 and are joined to an annular perimetric ridge 29 which is adapted to contain the pair of dampers 18a, 18b inside it.
  • spokes 28 lie on the same plane and branch off at a desired point of the lateral surface of the sleeve 23.
  • One of the pair of dampers 18a, 18b is positionable, in a fixed position, above and below the spokes 28, the dampers having, at the surfaces that interact with the spokes 28, adapted and complementarily-shaped grooves 30a, 30b.
  • the platelet 21 is thus interposed between the pair of dampers 18a, 18b.
  • the adjustment means 20 determine different stroke limit values that can be reached when the inclination that can be imparted to the chair occurs along separate diametric axes.
  • perimetric ridge 29 is annular and has a different shape structure at, for example, mutually opposite sides.
  • the annular perimetric ridge 29 has a square plan shape, corresponding to the shape of the pair of sleeves 18a, 18b but of larger dimensions in order to be able to contain the pair of sleeves 18a, 18b inside it.
  • the pair of second opposite sides 32a, 32b has a greater overall extension, in the direction of the axis of the sleeve 23, than that of the pair of first opposite sides 31a, 31b.
  • the second opposite sides 32a, 32b are mutually mirror-symmetrical, and therefore differently oriented, with respect to a median plane thereof that is diametrical to the sleeve 23, and each one has a third flap 33a, 33b which is directed, respectively, toward the upper first surface 17 of the flat base 3 and toward the lower first surface 16 of the flat bottom 9.
  • the third flaps 33a and 33b are therefore oriented mutually opposite with respect to a plane that is transverse to the sleeve 23.
  • Such third flaps 33a and 33b and the second opposite sides 32a, 32b can have the same or a desired shape or size, which can be the same or different.
  • first opposite sides 31a, 31b are mutually identical, have the same overall extension in the direction of the axis of the sleeve 23, and the overall extension is smaller than that of the second opposite sides 32a, 32b.
  • each one of the niches 35, 36 is obtained coaxially with respect to the fourth holes 19a, 19b so as to define, in the area adjacent to the perimetric rim of the pair of dampers 18a, 18b, a fourth flap 37a, 37b which is arranged, once the device 1 is installed, respectively adjoining the upper first surface 17 of the flat base 3 and at an annular second receptacle 38, which is provided via drawing on the lower first surface 16 of the flat bottom 9 of the plate 10 in an area adjacent to the second flap or lip 27b.
  • the device 1 therefore makes it possible to contain the compression of the pair of dampers 18a, 18b, such compression being controlled mechanically only at the plate 10 given that the shape structure and the size of the third flaps 33a, 33b have terminal ends which interact, in the phase of maximum inclination that can be assumed by the seat of the chair along the second direction, also indicated as front-back and as shown in Figure 13 , with the bottom of the second receptacle 38 present on the flat bottom 9 of the plate 10 and with the upper first surface 17 of the flat base 3.
  • the pair of dampers 18a, 18b can still be compressed without ensuring that a desired maximum travel is reached, but the pair of dampers can exceed such travel without a limit.
  • the ends of the third flaps 33a, 33b therefore act as a stroke limit and ensure the impossibility of exceeding the maximum angle, according to a determined (and determinable) inclination, for which it is desired to calibrate the tilting of the seat in the various directions.
  • the hypothetical-ideal center of rotation is always considered the center of gravity of the sleeve 23.
  • the invention fully achieves the intended aim and objects, a device having been obtained that makes it possible to incline, along all directions of the thrust plane and to a desired degree, seats, backrests or monocoque chairs, howsoever provided, as a function of the requirements of the user.
  • the device at the same time makes it possible to preset the degree of freedom of movement of the chair according to requirements, both in terms of breadth of movement, and in terms of resistance to movement, simply by using a desired elastomer contoured according to the requirements and mixed according to the hardness required by the end user, in order to have different elastic responses.
  • the interaction between the parallel planes of the flat base 3 and of the plate 10 and the pair of dampers 18a, 18b derives from a mechanical, not chemical, assembly, which makes it possible to perform a precompression/preloading of the elastomer proper; in this manner the elastic material is already in an optimal working configuration when in the inactive condition (in the absence of the weight of the user) and the elastic response generated is similar to its guaranteed load curve.
  • the device further allows rapid and easy assembly, even when using metallic detailed parts that are zinc-plated, chrome-plated or painted, or sheets preferably in carbon steel, which may be contoured and deformed and normally powder coated, and it can be removed, rapidly and easily replaced using normal tools (wrenches, hexagonal Allen keys, a hammer), and its components can also be disposed of individually with differentiation of metals and plastics.
  • the pair of dampers 18a, 18b is kept correctly in position even during their activation, by virtue of the presence of the first flap or lip 27a and of the second flap or lip 27b, the ends of which are facing toward the niches 35, 36.
  • the invention makes it possible to achieve, simply and effectively, an end-of-stroke condition of the inclination that can be assumed by the seat of the chair in the phase of maximum inclination along the second direction, also indicated as front-back.

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  • Chairs Characterized By Structure (AREA)
EP20171504.2A 2019-05-14 2020-04-27 Device for adjusting the degree of inclination of the seat of a chair Active EP3738474B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT102019000006798A IT201900006798A1 (it) 2019-05-14 2019-05-14 Dispositivo di regolazione del grado di inclinazione di una sedia
IT102020000002200A IT202000002200A1 (it) 2020-02-05 2020-02-05 Dispositivo di regolazione del grado di inclinazione di una seduta di una sedia

Publications (2)

Publication Number Publication Date
EP3738474A1 EP3738474A1 (en) 2020-11-18
EP3738474B1 true EP3738474B1 (en) 2023-06-07

Family

ID=70333898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20171504.2A Active EP3738474B1 (en) 2019-05-14 2020-04-27 Device for adjusting the degree of inclination of the seat of a chair

Country Status (2)

Country Link
EP (1) EP3738474B1 (pl)
PL (1) PL3738474T3 (pl)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019073419A1 (en) * 2017-10-11 2019-04-18 Fleetwood Group, Inc. OSCILLATING SEAT STOOL

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2184988A (en) * 1935-11-27 1939-12-26 Collier Keyworth Company Chair iron
CH275739A (de) * 1949-08-19 1951-06-15 Stoll Albert Stuhl mit einem bei Belastung federnd nachgebenden Teil, der gegenüber dem Teil, an welchem er befestigt ist, verdrehbar ist.
IT245520Y1 (it) 1998-07-16 2002-03-22 Beniamino Miotto Dispositivo meccanico particolarmente per la movimentazione sincronadi sedile e schienale di una sedia.
DE202004005366U1 (de) * 2004-04-05 2004-06-24 VS Vereinigte Spezialmöbelfabriken GmbH & Co. Stuhl mit Wippmechanik

Also Published As

Publication number Publication date
EP3738474A1 (en) 2020-11-18
PL3738474T3 (pl) 2023-10-23

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