EN 16955:2017

Hardware for furniture - Tapered pressure tubes for self-supporting gas springs for the height adjustment of seating - Test methods and requirements for strength and durability

This European Standard specifies test methods and requirements for the strength and durability of tapered pressure tubes for self-supporting gas springs for the height adjustment in seating.
Annex A (normative) contains product information.
Annex B (informative) contains a guide for choosing the correct strength class.

Möbelbauteile - Konische Druckrohre für selbsttragende Gasfedern zur Höhenverstellung von Sitzmöbeln - Prüfverfahren und Anforderungen für die Festigkeit und Dauerhaltbarkeit

Diese Europäische Norm legt Prüfverfahren und Anforderungen an die Festigkeit und Dauerhaltbarkeit von konischen Druckrohren für selbsttragende Gasfedern zur Höhenverstellung von Sitzmöbeln fest.
Anhang A (normativ) enthält Produktangeben.
Anhang B (informativ) enthält einen Leitfaden für die Auswahl der richtigen Festigkeitsklasse.

Quincaillerie d'ameublement - Tubes coniques sous pression pour vérins à gaz autoportants pour l'ajustement de la hauteur de siège - Méthodes et exigences d'essai pour la résistance et la durabilité

La présente Norme européenne spécifie les méthodes et les exigences d’essais pour la résistance et la durabilité des tubes sous pression pour vérins à gaz autoportants pour l'ajustement de la hauteur de siège.
L’annexe A (normative) comporte des informations sur le produit.
L’Annexe B (informative) comporte un guide pour choisir la classe de résistance adéquate.

Pohištveno okovje - Stožčaste tlačne cevi za samopodporne plinske vzmeti za nastavitev višine sedenja - Preskusne metode in zahteve za trdnost in trajnost

Ta evropski standard določa preskusne metode in zahteve za trdnost in trajnost stožčastih tlačnih cevi za samopodporne plinske vzmeti za nastavitev višine sedenja.
Dodatek A (normativni) vključuje informacije v zvezi z izdelkom.
Dodatek B (informativni) vključuje navodila za izbiro ustreznega razreda trdnosti.
c

General Information

• Status: Published
• Publication Date: 11-Apr-2017
• Withdrawal Date: 30-Oct-2017
• ICS: 97.140 - Furniture
• Technical Committee: CEN/TC 207 - Furniture
• Drafting Committee: CEN/TC 207/WG 8 - Hardware for furniture
• Current Stage: 9093 - Decision to confirm - Review Enquiry
• Start Date: 26-May-2023
• Completion Date: 14-Apr-2025
• Ref Project: SIST EN 16955:2017 - Hardware for furniture - Tapered pressure tubes for self-supporting gas springs for the height adjustment of seating - Test methods and requirements for strength and durability

Overview

EN 16955:2017 (CEN) specifies test methods and requirements for the strength and durability of tapered pressure tubes used in self-supporting gas springs for height adjustment of seating. The standard defines sampling, test apparatus, test procedures and acceptance criteria to ensure safe, durable pressure tubes in furniture applications. Annex A (normative) provides required product information and mounting details; Annex B (informative) gives guidance for selecting the correct strength class.

Key topics and technical requirements

• Scope: Tapered pressure tubes for self-supporting gas springs used in seating height adjustment.
• Strength classes: Strength classes 2, 3 and 4 are defined with associated alternate bending moments and maximum seat-offset dimensions (u). Class 4 covers seating for users up to 150 kg (see Table B.1).
• Sampling: Type tests require 32 pressure tubes taken at random from series production.
• Fatigue testing: Alternate bending stresses applied per ISO 1099 for 2 × 10^6 cycles; stress cycle frequency must not exceed 30 Hz; test temperature ≤ 50 °C; lever arm (force application) (150 ± 5) mm.
• Test equipment: Use a material testing machine verified per EN ISO 7500-1:2016 (Class 1). Magnetic particle inspection equipment must meet EN ISO 9934-2 requirements.
• Non-destructive inspection: After fatigue testing, perform a magnetic powder flaw test over the entire surface and circumference (wet media, AC magnetization, tangential field ≥ 2 kA/m).
• Pass criterion: No cracks or fractures on any of the 32 tested tubes.
• Marking & documentation: Each pressure tube must be indelibly marked with manufacturer, type designation and reference to EN 16955 and the strength class. Test reports must document test lab, dates, full tube description, fixture dimensions, bending moment, frequency and post-test condition.

Practical applications

• Ensures reliable, long-term performance of gas springs used in office chairs, task seating and other adjustable furniture.
• Guides product design, supplier qualification and procurement specifications for furniture manufacturers.
• Provides test protocols for independent testing laboratories verifying strength and durability.
• Helps service and maintenance teams confirm correct replacement parts and safe repair practices.

Who uses this standard

• Furniture and seating manufacturers
• Gas-spring and pressure-tube producers
• Quality assurance and R&D engineers
• Test laboratories and certification bodies
• Procurement specialists specifying seating components

Related standards

• EN ISO 4288 (surface texture)
• EN ISO 7500-1:2016 (verification of testing machines)
• EN ISO 9934-2 (magnetic particle testing)
• ISO 1099 (fatigue testing - axial force-controlled method)

For seating designs outside Table B.1 limits (e.g., >150 kg user weight or larger offset u), EN 16955:2017 recommends consulting the gas spring manufacturer for bespoke solutions.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Möbelbauteile - Konische Druckrohre für selbsttragende Gasfedern zur Höhenverstellung von Sitzmöbeln - Prüfverfahren und Anforderungen für die Festigkeit und DauerhaltbarkeitQuincaillerie d'ameublement - Tubes coniques sous pression pour vérins à gaz autoportants pour l'ajustement de la hauteur de siège - Méthodes et exigences d'essai pour la résistance et la durabilitéHardware for furniture - Tapered pressure tubes for self-supporting gas springs for the height adjustment of seating - Test methods and requirements for strength and durability97.140PohištvoFurnitureICS:Ta slovenski standard je istoveten z:EN 16955:2017SIST EN 16955:2017en,fr,de01-november-2017SIST EN 16955:2017SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16955
April
t r s y ICS
{ yä s v r English Version
Hardware for furniture æ Tapered pressure tubes for selfæsupporting gas springs for the height adjustment of seating æ Test methods and requirements for strength and durability Quincaillerie d 5ameublement æ Tubes coniques sous pression pour vérins à gaz autoportants pour l 5ajustement de la hauteur de siège æ Méthodes et exigences d 5essai pour la résistance et la durabilité
Möbelbauteile æ Konische Druckrohre für selbsttragende Gasfedern zur Höhenverstellung von Sitzmöbeln æ Prüfmethoden und Anforderungen für die Festigkeit und Dauerhaltbarkeit This European Standard was approved by CEN on
s w February
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s x { w wã t r s y ESIST EN 16955:2017

Product information . 9 A.1 General . 9 A.2 Provisions . 9 A.3 Marking on the gas spring . 9 A.4 Gas spring activation. 9 A.5 Connection between pressure tube and the seat mechanism. 9 A.6 Holding cone on the seat mechanism. 10 Annex B (informative)
Guide for choosing the correct strength class . 11 B.1 General . 11 B.2 User weight . 11 B.3 Dimension u . 11 B.4 Choosing the correct gas spring . 11 B.5 Recommendations for gas springs outside specifications in Table B.1 . 12
...