US 2026/0174243 A1Published application

Adjustment structure for lifting and descending backrest

AssigneeHuizhou Kentec Office Seating Co., LTD.

InventorChih-Cheng Su

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Abstract

An adjustment structure for lifting and descending a backrest contains: a support element with a toothed unit, a holder, and a lifter. The lifter is independently connected on the support element and the holder to be moved downward and upward and returned to an original position stably and smoothly. Preferably, the adjustment structure for lifting and descending the backrest is connected easily to reduce a fabrication cost.

Claims10

Dependent claims

An adjustment structure for lifting and descending a backrest comprising:

a holder, a chamber defined on a center of the holder, a vertical moving space defined on a top of the holder and communicating with the chamber, wherein a slider of a support element slides in the vertical moving space, and the slider includes a toothed unit formed in the chamber of the holder, wherein the toothed unit includes a locating zone formed therein, and the locating zone has multiple fixing teeth formed therein, wherein each of the multiple fixing teeth has a slot longitudinally extending from a center of each fixing tooth, and the slot has a bottom stop face extending downward therefrom, wherein a lifter is defined between the chamber of the holder and the toothed unit of the support element, and the lifter includes:
a casing accommodated in the chamber of the holder, wherein the casing includes an accommodation room defined therein, a clamp portion fixed on a top of the accommodation room, and two rotation orifices defined on two internal fences of the accommodation room;
a toothed engagement element including an opening from which a rotary shaft extends outward, wherein the toothed engagement element is rotatably connected with and rotates along the two rotation orifices of the casing by using the rotary shaft;
wherein the toothed engagement element includes at least two toothed sections extending outward, each of the at least two toothed sections meshes with or removes from each fixing tooth of the support element, the toothed engagement element further includes a rotatable actuation protrusion corresponding to the slot of the support element, wherein the rotatable actuation protrusion has a first drive face corresponding to the top stop face of the support element, the toothed engagement element actuates the first drive face to rotate by using the top stop face so that each toothed section of the toothed engagement element rotatably meshes with each fixing tooth of the support element, the rotatable actuation protrusion has a second drive face corresponding to the bottom stop face of the support element, the toothed engagement element actuates the second drive face to rotate by using the bottom stop face so that each toothed section of the toothed engagement element rotatably remove from each fixing tooth of the support element;
and
an elastic sheet including a clamping edge formed on a top thereof, and the elastic sheet including a force portion formed on a bottom thereof, wherein the clamping edge is engaged with the clamp portion of the casing, and the force portion movably abuts against a rear end of the toothed engagement element.

3 more elements

Dependencies are inferred from the claim text.

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Abstract

An adjustment structure for lifting and descending a backrest comprising:

a holder, a chamber defined on a center of the holder, a vertical moving space defined on a top of the holder and communicating with the chamber, wherein a slider of a support element slides in the vertical moving space, and the slider includes a toothed unit formed in the chamber of the holder, wherein the toothed unit includes a locating zone formed therein, and the locating zone has multiple fixing teeth formed therein, wherein each of the multiple fixing teeth has a slot longitudinally extending from a center of each fixing tooth, and the slot has a bottom stop face extending downward therefrom, wherein a lifter is defined between the chamber of the holder and the toothed unit of the support element, and the lifter includes:
a casing accommodated in the chamber of the holder, wherein the casing includes an accommodation room defined therein, a clamp portion fixed on a top of the accommodation room, and two rotation orifices defined on two internal fences of the accommodation room;
a toothed engagement element including an opening from which a rotary shaft extends outward, wherein the toothed engagement element is rotatably connected with and rotates along the two rotation orifices of the casing by using the rotary shaft;
wherein the toothed engagement element includes at least two toothed sections extending outward, each of the at least two toothed sections meshes with or removes from each fixing tooth of the support element, the toothed engagement element further includes a rotatable actuation protrusion corresponding to the slot of the support element, wherein the rotatable actuation protrusion has a first drive face corresponding to the top stop face of the support element, the toothed engagement element actuates the first drive face to rotate by using the top stop face so that each toothed section of the toothed engagement element rotatably meshes with each fixing tooth of the support element, the rotatable actuation protrusion has a second drive face corresponding to the bottom stop face of the support element, the toothed engagement element actuates the second drive face to rotate by using the bottom stop face so that each toothed section of the toothed engagement element rotatably remove from each fixing tooth of the support element;
and
an elastic sheet including a clamping edge formed on a top thereof, and the elastic sheet including a force portion formed on a bottom thereof, wherein the clamping edge is engaged with the clamp portion of the casing, and the force portion movably abuts against a rear end of the toothed engagement element.

3 more elements