QB/T 2280-2016Office furniture. Office chair (English PDF)

5.1 Main dimensions

Main product dimensions shall be in accordance with those specified in Table 1.See

Figures 4, 5 and 6 and Table 1 for codes and deviation requirements. The dimensions with special requirements shall be indicated by the supplier and the purchaser in the contract.

5.2 Shape and position tolerances

Product shape and position tolerances shall be in accordance with those specified in

Table 2.

5.3 Appearance

5.3.1 Appearance of plastic parts

5.3.5 Coating and plating

5.3.5.1 Wooden parts coating shall be flat and smooth without scratch, fog lights, white ridge, flake, sagging, deposited powder, lag or visible color difference.*

5.3.5.2 Wooden parts coating shall be free from swelling, wrinkling, sticking and holiday.

5.3.6 Other appearance requirements

5.3.6.1 The parts of the product shall be free from damage.

5.3.6.2 Fixed positions shall be joined firmly without looseness, lack of parts, nail missing or exposure.

5.3.6.3 All the external angles of the product and positions in contact with human body shall be blunted without burr, cutting edge or corner angle.

5.4 Physical and chemical properties

Physical and chemical properties of the product shall meet those specified in Table 3.

Table 3 -- Physical and Chemical Properties

5.5 Mechanical properties

Mechanical properties of the product shall meet those specified in Table 4.

5.8 TVOC

TVOC of office chair shall not be greater than 0.5 mg/m2h.

5.9 Safety (only applicable to office chair with gas spring)

5.9.1 Basic safety

Isolation measures shall be taken between the bottom of the seat and the gas spring, steel plate or chassis not less than 2 mm in thickness may be adopted for isolation.

6.1 Precision

Unless otherwise specified, the following measuring precision shall be adopted.

6.2 Main dimensions

6.2.1 Determination of Point A

Put a 64 kg-load module (see Appendix A) on the seat with center line as symmetry plane, ensuring that the center of guiding axle of the main weight is consistent with the center of the seat's rotation axle. Before the test, the seat shall be loaded before being unloaded, repeat 5 times.

6.2.3 Seat height

As shown in Figure 8, put the seat on a flat and hard plate, determine Point A with a

64 kg-load module (see Appendix A), measure the distance from Point A to the plate

H1 (see Figure 8).

6.2.4 Lift travel

Measure the highest seat height and the lowest seat height in accordance with 6.2.3, and calculate the difference.

6.2.5 Other main dimensions

Other main dimensions shall be determined according to the requirements of 5.1 in

GB/T 3325-2008.

6.3 Shape and position tolerances

6.3.1 Back eccentricity

Rotate the test piece to where it is easiest to overturn, measure the horizontal distance e between the connecting line of support points at the outermost side of the base and vertical lead of the force bearing point, d, at the top of the back.

6.3.2 Shape symmetry

Measure the distance between two diagonals of the symmetry plane (component), then measure the distance between support points of support castor for the base, and the difference between them is the shape symmetry.

6.4 Appearance

6.4.1 Decoloration

Inspect 3 positions on the product's external finished parts or plastic parts, wipe each position with white soft damp cloth or white degreased gauze properly for 3 times for a distance of 200 mm ~300 mm. Observe if the soft damp cloth or white degreased gauze has the color of the finished parts.

6.5 Physical and chemical properties

6.5.1 Flexible polyurethane foam

6.5.2 Color fastness to dry friction of textile fabric

It shall be tested according to the requirements of GB/T 3920.

6.5.3 Metal parts coating

6.5.3.1 Resistance to salt spray

It shall be tested according to the requirements of QB/T 3826.

6.5.3.2 Adhesive force

It shall be tested according to the requirements of GB/T 9286.

6.5.4 Resistance to salt spray of galvanized coating

It shall be tested according to the requirements of QB/T 3826.

6.6 Mechanical property

6.6.1 Stability

It shall be tested according to the requirements of GB/T 10357.2.

6.6.3 Static load on seat and back

6.6.3.1 Static load on seat

It shall be tested according to the requirements of 4.3.1 in GB 10357.3-2013.

6.6.3.2 Static load on back

It shall be tested according to the requirements of 4.3.2 in GB 10357.3-2013.

6.6.6 Reciprocating abrasion on castor

Connect the chair and the circulating equipment together.

Put the chair on a hard and smooth surface with 3 obstacles (see Figure 14), as shown in Figure 15.

6.6.7 Static load on base

As shown in Figure 17, put inside steel block or other similar supporting objects instead of roller / sliding feet (roller / sliding toe pool may be kept). The axis of roller / sliding feet provides support. The height of the steel block or supporting object shall be enough for the central axis or chair leg not to touch the test bed in the test process.

Remove the support device and height adjusting device on the base. Directly load on the support bar in a vertical way, or apply load vertically by conical test device or the test device similar to base interface.

6.10 Safety

6.10.1 Basic safety

The steel plate thickness shall be measured by straight steel ruler or tape with division value of 1mm.

6.10.2 Sealing performance

Remove the parts above the seat of the sample.

Keep the gas spring compressed, then measure the seat height according to 6.2.3;

and measure the seat height again according to 6.2.3 after storing for 72 h at normal temperature.

6.10.3 High and low temperature resistance

The prepared sample shall be subjected to high/low temperature treatment. firstly, put it into a (-30±2)°C low temperature test chamber for 48h, take it out, then put it into a (60±5)°C high temperature test chamber for another 48h. Take out the gas spring and calculate the decrement of its nominal force Fa.

6.10.4 Cycle life

The gas spring piston rod undergone high/low temperature storage test shall be clamped on the testing machine downward for cycling life test at the frequency of 8 times / min - 12 times / min, and the temperature of the wall of outer drum shall not be larger than 50°C during the test. After cycling for 50,000 times, measure the decrement of nominal force Fa.

7.1 Inspection classification

Product inspection may be classified into type inspection and end-of-manufacturing inspection. Type inspection evaluates the compliance of all inspection items in addition to those specified in the contract. While end-of-manufacturing inspection judges the compliance of the items specified in 5.1, 5.2 and 5.4 of this standard.

7.2 End-of-manufacturing inspection

7.2.1 End-of-manufacturing inspection shall be carried out at the end of manufacturing of the product or in case of delivery. The items specified in 5.1, 5.2 and

5.3 of this standard are end-of-manufacturing inspection items.

7.2.3 End-of-manufacturing inspection shall be carried out by the quality inspection department of the enterprise within the validity of the type inspection of product.

7.2.4 All the inspection items without "*" in main dimension, tolerances of form and position and appearance are qualified; while those with "*" and with no more than 5 defects are judged as qualified in the end-of-manufacturing inspection, otherwise they shall be judged as unqualified.

7.2.5 Unqualified products shall not leave the factory.

7.3 Type inspection

7.3.1 Type inspection is about comprehensive assessment on product quality. Type inspection shall be carried out under one of the following conditions.

7.3.2 Sampling and product grouping rules

In sampling, 7 samples, 1 component base, 1 gas spring and a set of castor shall be randomly taken from the same batch within an inspection period, except that 3 samples shall be sealed for storing, the rest shall be delivered for inspection. If the supplier and the purchaser have other contract provisions, then samples shall be taken according to those specified in the Contract.

7.3.5 Reinspection

7.3.5.1 Re-inspection may be carried out in case either party has disagreement on the inspection results during inspection and to the objectionable items of un-accepted products within the specified period during delivery.

7.3.5.2 Re-inspection shall be directly carried out to stand-by samples.

7.3.5.3 The items unqualified last time or failing to be inspected last time due to damage of sample shall be subjected to re-inspection and noted with "re-inspected" in the report.

8.1 Marking

The products shall be provided with marking and application instruction, and shall meet the requirements of GB 5296.6.The contents of product instructions shall at least include.

8.2 Packaging

The product shall be appropriately packaged to avoid damage.

8.3 Transportation

The products shall be provided with gasket and cover during transportation to avoid damage, sun and rain.

8.4 Storage

The products shall be stored in the well-ventilated, dry and clean environment to avoid contamination, sun and rain.

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