Standard No.:	GB/T 41173-2021
English Name:	Chairs with electrical mechanism to assist standing up
Chinese Name:	电动辅助站立椅子
Chinese Classification:	C45    Extracorporeal circulation, artificial organ and prosthesis device
Professional Classification:	GB    National Standard
Issued by:	SAMR; SAC
Issued on:	2021-12-31
Implemented on:	2021-12-31
Status:	valid
Language:	English
File Format:	PDF
Word Count:	8500 words
Price(USD):	255.0
Delivery:	via email in 1~3 business day

1 Scope This document specifies the structure, requirements, test methods, inspection rules and marking, packaging, transport and storage of electrically assisted standing chairs. This document applies to chairs that are lifted by motor control to assist users with a mass not exceeding 100 kg to get up and sit down. 2 Normative references The contents of the following documents constitute the essential provisions of this document through the normative references in the text. Among them, note the date of the cited documents, only the date of the corresponding version applicable to this document; do not note the date of the cited documents, the latest version (including all the revision of the list) applicable to this document. GB/T 191 Pictorial marking of packaging, storage and transport GB/T 16432 Classification and terminology of rehabilitation aids 3 Terms and definitions The terms defined in GB/T 16432 and the following terms and definitions apply to this document. 3.1 Electrically assisted standing chairchairs with electrical mechanism to assist standing up Equipment (device) with a seating function where the seat surface is electrically powered to assist the user to rise up automatically. 3.2 Lifting part A movable part in contact with a body part. Electrical insulation under wet condition It is designed to prevent leakage of electricity and fire from the user due to incontinence, etc. 4 Structure The electric assisted standing chair consists of a control unit. backrest, armrests. The structure of the chair is shown in Figure 1. 5 Requirements 5.1 Appearance requirements 5.1.1 The electric assisted standing chair shall have no sharp objects penetrating the seat surface or backrest etc. in normal use. 5.1.2 There should be no edges or burrs on the tips of exposed parts etc. 5.2 Design requirements 5.2.1 If the clearance between the armrest and backrest is 120 mm or less, cylindrical gauges should not enter through the side of the armrest. 5.2.2 When the seat of the power-assisted standing chair is raised and lowered, the body contact part should not be embedded in the gap. 5.2.3 The lifting mechanism should be capable of stopping in any position as required by the user. 5.2.4 The force of operating switches such as buttons and levers designed to be operated by fingers, hands or feet shall comply with the requirements of Table 1. 5.2.5 For power assisted standing chairs with 3 or more castors, the number of castor brakes shall not be less than 2. 5.3 Performance requirements The performance of the power-assisted standing chair shall conform to the provisions of Table 2. 6 Test methods 6.1 Test facilities 6.1.1 Test ground, the test ground shall be level and flat. 6.1.2 Neck embedded in the test cylindrical gauges, diameter of 50mm. length of 100mm rigid cylinder. 6.1.3 body embedded in the test cylindrical gauges: a) diameter of 200 mm. length of 100 mm rigid cylinder; b) rigid cylinders with a diameter of 120 mm and a length of 100 mm. 6.1.4 Seat loading pads, rigid objects with a natural concave and convex shape (see Figure 2). 6.1.5 Backrest loading cushion, a rigid rectangular object with a length of 250 mm and a width of 200 mm, with a cylindrical loading surface, a radius of curvature of 450 mm and a chamfered radius of 12 mm around its edges (see Fig. 3). 6.1.6 Small seating surface loading pad. A rigid circular object with a diameter of 200 mm and a loading surface with a spherical surface and a radius of curvature of 300 mm and a chamfered radius of 12 mm around its perimeter (see Figure 4). 6.2 Test conditions All tests shall be carried out at a temperature of 5 C to 35 C and a relative humidity of 25 % to 95 %, except for the insulation performance test under humid conditions. 6.3 Test methods for appearance The test items in 5.1.5.2.1.5.2.2.2.5.2.3 and 5.2.5 of the power assisted standing chair shall be visually inspected. Hand feel. Trial use and other methods to determine. 6.4 Test methods for design requirements 6.4.1 Gaps in armrests and backrests The gap between the armrest and the backrest is pressed with a force of 150 N at the opening with the cylindrical gauge specified in 6.1.2. The horizontal line of the centre of the cylindrical gauge should be higher than the plane of the armrest, as shown in Figure 7a). If the centre level of the cylindrical gauge is below the plane of the armrest it does not meet the requirements of 5.2.1 C as shown in Fig. 7b)]. 6.4.3 Maximum operating force test method The maximum operating force is measured using a dynamometer on the operating button in accordance with the requirements of 5.2.4. 6.5 Performance tests 6.5.1 Fixation of the power assisted standing chair wrap The cover of the power assisted standing chair shall be pulled in the horizontal direction with a force of 100 N. The cover shall not fall off. 6.5.2 Friction Adjust the seat of the power assisted standing chair to the lowest position. Brake and place the chair on a smooth steel plate with a coefficient of friction of 0.2. Apply a gradual backward load to the front part of the seat and measure the maximum load F (maximum static friction) at which it starts to move, ensuring that the measured load is greater than the maximum static friction (F,) calculated using the following method. 6.5.3 Static load test 6.5.3.1 Static load test on the seat surface A small seat loading pad (see 6.1.6) is placed on the seat and a load of 1 300 N is applied vertically downwards 10 times at a distance of 175 mm from the rear edge of the seat, each load being held for at least 10 s. This is shown in Figure 9. 6.5.4 Durability A load of 980 N was applied to the seat surface and the power assisted standing chair was raised and lowered for a maximum of 10,000 reciprocating strokes. If not otherwise specified by the manufacturer, the work/pause ratio (duty factor) in the test should be 15/85. If the power assisted standing chair has an adjustable lifting speed, then the durability test should be carried out at the speed specified by the manufacturer for the worst conditions. Note: If the manufacturer does not specify the worst-case speed, the maximum speed shall be used. 6.5.5 Impact test 6.5.5.1 Seat surface impact test The power assisted standing chair is placed horizontally on the test floor and a foam padding is placed on the seat surface (foam density 27kg/m°~30kg). 27kg/m°~30kg/m', thickness 25mm), place the bottom of the chair seat impactor at a height of 180mm from the middle of the seat and let it fall freely, repeat the operation 10 times, as shown in Figure 13. 6.5.6 Stability test 6.5.6.1 Forward tilt test Set the power assisted standing chair to a stationary position with the seat in a horizontal position. The backrest is in the vertical up position. Place it on the test floor with the front feet in place and apply a load of 600 N to the small seat loading pad at a position 50 mm from the front edge in the middle of the seat and apply a force of 20 N horizontally forward along the centre line at this position as shown in Figure 16. Record whether the power assisted standing chair tilts over. Adjust the seat height of the power assisted standing chair to maximum with the backrest in the vertical up position and apply the same load as in Figure 16. Record if the power assisted standing chair tilts over. 6.5.7 Lifting speed With the seat surface unloaded, measure the time and distance taken to raise the last part of the seat surface from the lowest to the highest position and calculate the average speed. Measure three times and take the average value. 6.5.8 Insulation test in humid environment The test ambient temperature should be 10 C to 40 C. A square of cotton cloth with a side length of 300 mm and a thickness of 3 mm is placed in the centre of the seat. 350 ml. of 10% sodium chloride solution is injected into the central part of the cloth and a metal plate is placed on top of it with a weight of 20 kg. The insulation resistance is measured between the charged parts at 500 V under normal conditions in a humid environment and the surface of the non-charged material after 24 h under the pressure of the weight (as shown in Fig. 20) and is not less than 1 Mn. 7 Test rules 7.1 Factory inspection 7.1.1 The product shall be inspected by the quality inspection department. 7.1.2 Products in mass or continuous production shall be subject to factory inspection unit by unit. 7.1.3 The factory inspection shall be carried out in accordance with 5.1.5.2 for appearance and design requirements respectively. 7.2 Type test 7.2.1 The power-assisted standing chair shall be sent for type examination and shall be factory inspected and qualified. 7.2.2 One of the following cases shall be type tested. a) new products or old products transferred to the production of the prototype identification. b) formal production, structure, materials, processes have a large change, may affect the performance of the product. c) normal production, should be carried out once a year type test. d) Product production has been suspended for one year, when resuming production. e) factory test results and the last type test results have a large difference. 7.2.3 Type test in accordance with Chapter 5, Chapter 7 of all content. 7.2.4 Sampling and determination principles are as follows. a) type test in the factory inspection of any batch of qualified products, the sampling rate of 3 pieces taken for every 3,000 pieces, less than 3,000 pieces should also be drawn 3 pieces. b) the sample after the test, if any of its failure to meet the requirements of Chapter 5, Chapter 7, the sample is considered unqualified. c) If all three samples tested pass the type test, the batch passes. d) type test of 3 samples, there is a piece of failure, you can take 2 pieces of re-inspection, after the test, all qualified, the batch qualified, after the test there is still a piece of failure, the batch of products for failure. e) If 2 out of 3 samples of the type test fail, the batch will be unqualified. 8 Marking. Packaging, transport and storage 8.1 Marking The power-assisted standing chair shall have a clear and durable logo with at least the following content: a) the name of the manufacturer or its abbreviation, trademark and address; b) the product name and model number; 8.2 Packaging The packaging should be solid and reliable with clear markings. The packaging symbol should comply with the provisions of GB/T 191, and indicate the product name, model specification, quantity, manufacturer's name, trademark, address, telephone, net weight, gross weight. Box size, factory date, moisture and other signs. The packing box should be accompanied by a packing list, product certificate of conformity, product manual and other information. The product specification shall contain at least the following information: a) Name, address and telephone number of the manufacturer: b) Operation, set-up and assembly methods; c) External dimensions and quality of the power assisted standing chair: d) Precautions concerning the place of storage (do not store in hot and humid places); e) Maintenance methods. f) other necessary information about the power assisted standing chair. 8.3 Transport The product should be transported with care to prevent heavy pressure, impact, corrosion and moisture, and to keep the packaging intact. 8.4 Storage The product should be stored in a well-ventilated and dry room, away from objects that can cause corrosive changes to the product.

Foreword 1 Scope 2 Normative references 3 Terms and definitions 4 Structure 5 Requirements 6 Test methods 7 Test rules 8 Marking. Packaging, transport and storage