Length-adjustable column and manufacturing method thereof, piece of furniture

Abstract

Provided is a length-adjustable column with a standpipe having a longitudinal axis, a length-adjustment device arranged in the standpipe with a portion displaceably-mounted along the longitudinal axis with respect to the standpipe and an anti-rotation locking device for locking the portion against a rotation around the longitudinal axis relative to the standpipe. The anti-rotation locking device includes an inner element, which is fastened to an outer surface of the portion, and an outer element, which is fastened to an inner surface of the standpipe. The inner element cooperates with positive locking with the outer element against a rotation around the longitudinal axis, and is displaceably guided along the longitudinal axis by the outer element. The inner element is connected with the portion through a substance-to-substance connecting layer.

Claims

1. A length-adjustable column having a. a standpipe with a longitudinal axis and b. a length-adjustment device arranged in the standpipe, with a portion displaceably-mounted along the longitudinal axis with respect to the standpipe, wherein c. an anti-rotation locking device for locking the portion against a rotation around the longitudinal axis relative to the standpipe, d. wherein the anti-rotation locking device includes an inner element, which is fastened to an outer surface of the portion, and an outer element, which is fastened to an inner surface of the standpipe, e. wherein the inner element cooperates with positive locking with the outer element relative to a rotation around the longitudinal axis, and is displaceably guided along the longitudinal axis by the outer element, and the inner element is connected with the portion through a substance-to-substance connecting layer, wherein f. the inner element consists of a material having a strength that is at least equally high as that of the portion.

2. The column according to claim 1, wherein the inner element includes a steel with a hardened surface.

3. The column according to claim 1, wherein the outer element includes of a self-lubricating plastic material of polyoxymethylene.

4. The column according to claim 1, wherein the inner element and the outer element are shaped to be complementary to each other, wherein g. the outer element includes a cylindrical outer base body with a number of grooves in an inner surface of the outer base body and h. the inner element includes a cylindrical base body with a number of protrusions engaging in the grooves on an outer surface of the base body.

5. The column according to claim 4, wherein a transition area of protrusions of the inner element toward an inner base body of the inner element and/or an end of the protrusions that faces away from the inner base body is rounded.

6. A piece of furniture, which is a chair or a table, with a column according to claim 1.

Description

BRIEF DESCRIPTION

(1) Some of the embodiments will be described in detail, with reference to the following figures, wherein like designations denote like members, wherein:

(2) FIG. 1 a schematic longitudinal section of a column;

(3) FIG. 2 a schematic cross-section of a column;

(4) FIG. 3 a schematic perspective illustration of a column; and

(5) FIG. 4 a schematic illustration of a method.

DETAILED DESCRIPTION

(6) FIG. 1 shows a schematic longitudinal section along a longitudinal axis LA of a standpipe 110 of a column 100 according to embodiments of the invention. The standpipe 110 can, for example, be configured to be rigidly connected with a foot of a chair with its lower end in the illustration. A length-adjustment device 120 is arranged in the standpipe 110, which for example includes a piston cylinder unit. The length adjustment device 120 is, for example, rigidly connected with the standpipe 110 with its lower end in the representation. The upper end of the length-adjustment device 120 in the illustration can, for example, be designed for rigidly connecting with a seat of a chair. Through a length adjustment of the length-adjustment device 120, can thus be adjusted a distance between the seat of the chair from its foot, and thus a seat height, for example. The standpipe 110 and the length-adjustment device 120 are, for example, substantially cylinder-shaped, and arranged coaxially to the longitudinal axis LA.

(7) The longitudinal adjustment device 120 includes a portion 121, for example a part of a cylinder housing of a piston cylinder unit, onto the outer surface of which is fastened an inner element 140 of an anti-rotation locking device. The inner element 140 can be connected to the portion 121 through a substance-to-substance connecting layer (not illustrated), for example an adhesive layer.

(8) The inner element 140 cooperates, with positive locking, with an outer element 130 relative to a rotation around the longitudinal axis LA, said outer element being fastened to an inner surface of the standpipe 110, and is displaceably guided along the longitudinal axis LA by the outer element 130. The inner element 140 and the outer element 130 thus form an anti-rotation locking device 150 for securing the portion 121 against a rotation around the longitudinal axis LA relative to the standpipe 110.

(9) FIG. 2 shows a schematic cross-section orthogonally to the longitudinal axis LA of the column 100 illustrated in FIG. 1. In this illustration can be discerned the substance-to-substance connecting layer 160 between the inner element 140 and the portion 121. Furthermore, this illustration shows that in the illustrated example, the outer element 130 is for example composed of a cylindrical outer base body 131 with a number of, e.g. four, grooves 131 on an inner side. The grooves are in particular in each case spaced from one another other by 90° around the longitudinal axis LA. The illustration furthermore shows that the inner element 140 is composed of a cylindrical inner base body 141 with a number of, for example four in the represented example, protrusions 142 on an outer side. The protrusions engage with positive locking into the grooves 132, in particular with respect to a rotation around the longitudinal axis LA.

(10) A transition area 143 of the protrusions 142 to the inner base body 141 and an end 144 of the protrusions 142 that faces away from the inner base body 141 can in each case be rounded, particularly as illustrated in FIG. 2.

(11) FIG. 3 shows a schematic perspective illustration of the column 100 illustrated in FIG. 1 and FIG. 2.

(12) FIG. 4 shows a schematic illustration of a method 200 according to embodiments of the invention. The illustrated method 200 includes a provision 210 of a length adjustment device 120 with a, in particular cylindrical, portion 121 and a, in particular cylindrical, inner element 140 of an anti-rotation locking device with an inner base body, with an outer diameter of the portion 121 being smaller or equal to an inner diameter of the inner base body 141. The portion 121 and the inner base body 141 are, for example, provided through cold drawing from a steel.

(13) The provision 210 is followed by an application 220, for example, such as a brushing, of a metal adhesive on an outer surface of the portion 121.

(14) After the application 220, for example, an, in particular coaxial, arranging 230 of the portion 121 in the inner base body 141 is effected, for example, by inserting the portion 121 into the inner base body 141.

(15) After the arranging 230, e.g. a substance-to-substance connecting of the inner base body 141 with the portion 121, is effected, for example through a hardening of an adhesive.

(16) Although the present invention has been disclosed in the form of preferred embodiments and variations thereon, it will be understood that numerous additional modifications and variations could be made thereto without departing from the scope of the invention.

(17) For the sake of clarity, it is to be understood that the use of “a” or “an” throughout this application does not exclude a plurality, and “comprising” does not exclude other steps or elements. The mention of a “unit” or a “module” does not preclude the use of more than one unit or module.

LIST OF REFERENCE CHARACTERS

(18) 100 column

(19) 110 standpipe

(20) 120 length-adjustment device

(21) 121 portion

(22) 130 outer element

(23) 131 outer base body

(24) 132 groove

(25) 140 inner element

(26) 141 inner base body

(27) 142 protrusion

(28) 143 transition area

(29) 144 end

(30) 160 connecting layer

(31) 200 method

(32) 210 providing

(33) 220 application

(34) 230 arranging

(35) 240 connecting