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1、O F a 0 T a UDC 645.444.2:645.444.4:371.63 JIS JAPANESE INDUSTRIAL STANDARD School furniture (desks and. chairs for class room) Translated and Published by = Japanese Standards Association Printed in Japan 12 s I Copyright Japanese Standards Association Provided by IHS under license with JSALicensee
2、=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:40:32 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S S*LO2L 9L 4933b08 0088778 L In the event of any doubt arising, the original Standard in Japanese is to be final authority. Copyright Japane
3、se Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:40:32 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS S*i u k d m 3 : 2 c, c, M (d a k O 2 c, d a a $ 5 3 3 3 O c, m pi k n
4、3 U Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:40:32 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S SX102L 71 W 4933b08 0088783 5 m v 1 n 9 I -;z“ d
5、4 -ri m m I r I 5 S 1021-1991 A I j V 5. Structure The structure shall be as follows. However, where there is no corre- sponding part or product, the item is not applicable. (1) The assembly shall be made strong by welding or other method. (2) If the assembly uses screws or other metal fittings, the
6、se shall be fastened securely such that there is no loosening at the junctions. (3) The adhering parts shall be adequately adhered so. as not to cause peeling. (4) Where wood or similar material is used, the structure shall be such that after assembly there will be no defects such as deviations, cra
7、cks, etc. (5) Parts of the desk such as the legs, hooks, etc., shall be such that the outmost ends are inside the edge of the top board. In consideration of the safety, dangerous hooks shall not be used. The leg ends shall be suitably treated so that moving the desk, does not scratch the floor surfa
8、ce or leaves traces. (6) They shall also be attached sufficiently tightly so as to not detach easily. (7) If there is a drawer, the structure shall be such that it does not fall out easily when pulled out. Pressure from the under side by the knees, etc., shall not easily detach the bottom plate. 6.
9、Dimensions 6.1 Manufacturing dimensions Dimensions of desks and chairs shall be as specified for the parts shown in Figs. 1 and 2, and the dimensions of each part shall be as given in Tables 3 and 4. Desk ? Fig. 1. (Example) Chair Seat F.L. Copyright Japanese Standards Association Provided by IHS un
10、der license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:40:32 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S S*l021 91 D q933b08 0088784 7 m , . 6 S 1021-1991 Fig. 2, (Example) Chair Desk Table 3. Dimensions of each part
11、 (Desk) Unit: mm - !JO. 1 730 - Class Spe- rial 760 - vo. : 700 - go. I 520 - Height of the desk surface Height of the lower limb space II, 650 min. 620 min. 590 min. 410 min. Height 2 of the lower h, limb space 620 min. 590 min. 560 min. 390 min. 490 min. - 460 min. - 430 min. - 250 min, - Height 3
12、 of the lower h4 4 limb space Depth of the desk and depth 1 of the lower limb space 400 Depth 2 of the lower limb space d, 330 min. 250 min. Depth 3ofthelowerlimbspace d, Width of the desk lC, 600 Width of the lower limb space IC, 440 min. Copyright Japanese Standards Association Provided by IHS und
13、er license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:40:32 MDTNo reproduction or networking permitted without license from IHS -,-,- Table 4. Dimensions of each part (Chair) Unit: mm Height of the seat surface is I 460 I 44.0 I 420 I 400 I 380 I 360 I
14、 340 I 320 I 300 I 280 I 260 I 240 I I I I I I I I I I I I Height of the back rest point and measure the twisting for C-C and D-D: 9.4 Strength tests 9.4.1 Repeated impact resistance testing of desks For the repeated impact resistance test of desks, place the specimen on a test floor as specified in
15、 9.1 (4) (a), and, as shown in Fig. 7, load the plate for a load of 600 x 400 x 9 mm and fix a weight of mass 60 kg on the top board. This mass includes the mass of the bag, pad plate for the load, and fixing devices. Next, attach the swivel metal fittings at the lower end of the leg on the reverse
16、of the sitting side of the desk, fix to the floor surface, lift up the lower end of the leg on the sitting side 100 mm and let drop. Repeat this operation at a rate of approximately 30 times per minute . continuously for 2000 times, and check for abnormalities of each part, Fig. 7. Repeated impact r
17、esistance testing of desks Unit: mm (Example) ,-Weight (mass 60 kg) Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:40:32 MDTNo reproduction or networking permitted without license from
18、IHS -,-,- 13 S 1021-1991 9.4.2 Repeated impact resistance testing of chairs For the repeated impact resistance test of chairs, place the specimen on the test floor specified in 9.1 (4) (a), and, as shown in Fig. 8, fix the weight of mass 60 kg on the seat surface so as to be distributed roughly, uni
19、formly. mass includes the mass of the bag and the fixing fittings. e This To pull, attach a pad plate to the back rest. Next, attach a swivel metal fitting to the lower ends of the rear legs to fix to the floor surface, pull the back rest part, lift the lower ends of the front legs 100 mm above the
20、floor surface and let drop. Repeat this operation at a rate of approxi- mately 30 times per minute continuously for 5000 times, and check for abnormalities of each part. Fig. 8. Repeated impact resistance testing of chairs (Example) Unit: mm Pad plate Pulling e direction Mass of 60 k g , Seat sur :a
21、l 9.4.3 Repeated impact resistance testing of containers For the repeated impact resistance testing of containers. fix the mecimen on a test floor as-specified in 9.1 (4) a) reversing the top and bottom so that the bottom of the container becomes horizontal, and, as shown in Fig, 9, place a pad plat
22、e for a load of 300 x 200 x 9 mm on the middle part of the container, lift Up a weight of mass 15 kg to a height of 50 tr 10 mm and let it drop. this operation at a rate of approximately 30 times per minute continuoudy for 300 times, remove the weight, and check for abnormalities of each part, Repea
23、t r: 0 Fig. 9. Repeated impact resistance testing of containers Unit: mm (Example) Pad plate . . Weight (bag containing sand) I Stand Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:40:3
24、2 MDTNo reproduction or networking permitted without license from IHS -,-,- _- JIS SW1021 91 L1933608 0088792 b - , 14 S 1021-1991 9.4.4 Vertical load testing of drawers For the vertical load testing of drawers, fix the specimen on a test floor as specified in 9.1 (4) (a), and, as shown in Fig. 10,
25、with the drawer pulled out to 2/3 of its depth, load the weight of mass 15 kg at a position 5 cm from the front edge, leave it for 24 h, and check for abnormalities in opening and closing the drawer and each part. Fig. 10. Vertical load testing of drawers Unit : (Example) 1 mm 15 kg) 9.5 Surface tre
26、atment testing 9.5.1 Testing of the thickness of the paint film on wood parts The testing of the thickness of the paint film on wood parts shall be as given in 3.5 (Measurement of the thickness of paint film) of JIS K 5400. 9.5.2 Testing of the plating thickness on metal parts the plating thickness
27、on metal parts shall be as given in 5.4 (Thickness test) of JIS H 8617 or 5.2 (Thickness test) of JIS H 8610. The testing of 9.5.3 Testing of resistance to ordinary temperature liquids For the testing of resistance to ordinary temperature liquids, use for the test piece test liquid of the four class
28、es of acetic acid 4.4 % solution, ammonia 10 % solution, neutral detergent, and ink for office, as given in JIS A 1531, let stand for 6 h, wipe off the test liquid, and check for abnormalities on the painted. 9.5.4 Testing of paint adhesion to wood parts For the testing of paint adhesion to wood par
29、ts, incline a sharp knife apprommately 30 degrees to the test piece, scratch 11 lines to intersect at right angles at intervals of 2 mm so that the blade reaches the wood base to make 100 measures of 2 x 2 mm. peel off, and check for peeling of the paint. Attach the adhesive tape specified in JIS Z
30、1522, immediately 9.5.5 Testing of paint film adhesion to metal parts For the testing of paint film adhesion to metal parts, incline a sharp knife appxoimately 30 - degrees to the test piece, scratch 11 lines to intersect at right angles at intervals of 1 mm so that the blade reaches the metal base
31、(steel plate OP steel pipe) to make 100 measures of 1 x 1 mm. specified in JIS Z 1522, immediately peel off, and check for peeling of the paint film. Attach the adhesive tape Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing,
32、Bernie Not for Resale, 03/15/2007 21:40:32 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS S*iO21i 71 m 9733b08 0088773 8 m 15 S 1021-1991 e k e 0 e 9.5.6 Testing of the rust resistance of paint on the metal parts For the testing of the rust resistance of paint film on
33、the metal parts, scratch each diagonal line on the test piece to reach the steel plate using a sharp knife and, as shown in Fig. 11, immerse approximately half of the test piece with the scratches into a beaker with 3 % brine (15 to 25OC) of approximately 70 mm in depth, allow 100 h to lapse, then w
34、hile immersed, check for blistering to 3 mm on both sides of the scratches, pull up and wash gently with water, dry, and check for rust to 3 mm on both sides of the scratches. Fig. 11. Testing of rust resistance of paint film on Unit: mm the metal parts (Example) Make scratches st pi .ece Test piece
35、 % brine (15 t o 25C) 9.5.7 Testing of the paint film hardness on the metal parts For the testing of the paint film hardness on the metal parts, hold by a device or by hand a pencil at approximately 4 5 O to the effective surface of the test piece, and press the pencil with the strongest force possi
36、ble while the lead is not broken at a rate of approximately 3 mm/l s toward the front direction from this position. In this method, when two pencils adjacent to each other in hardness symbols, while varying the position and scratching five times, reach a combination where one peels the paint film tw
37、o or more times and the other one peels less than two times, indicate the hardness of the paint film by the hardness symbol of the pencil of less than two times (Refer to Fig. 12). Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=
38、Wing, Bernie Not for Resale, 03/15/2007 21:40:32 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S S*:LO2L 91 m 4933b08 0088794 T m 16 S 1021-1991 Fig. 12. Testing of the paint film hardness on the metal parts (Example) / ! a Test piece shall be flat Remarks: For the pe
39、ncils, use pencils for design drawing specified in JIS S 6006, always manufactured by the same manufacturer, and expose the lead approximately 3 mm with the lead diameter as is. Next, use abrasive paper, No. 400 specified in JISR 6252 or superior or an oil grind stone to make the top end of the lead
40、 fiat at right angles. Once the abraded portion of a pencil is used for a test, it may not be used for another test. 10. Inspection The inspection of products shall be carried out for the quality, structure, dimensions, and marking, and products shall comply with the specifications of clauses 4 . to
41、 6. and 11. Any effective sampling inspection plan may be used. 11. Marking: Products shall be marked with the following: (1) Marking of the class, compatible stature range, and base color of the marking label. Remarks 1. The class, compatible stature range, and base color of the marking label shall
42、 be as given in Table 7 according to JIS Z 8721. 2. The dimensions, shape, etc., of the marking label shall be as given in Fig. 13. e The color of the letters and frame shall be black, and the base color shall be the specified color. Copyright Japanese Standards Association Provided by IHS under lic
43、ense with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:40:32 MDTNo reproduction or networking permitted without license from IHS -,-,- o Class Special No. i No. 2 No. 3 No. 4 No. 5 17 s 1021-1991 Height of the Height of the Standard Compatible Base color of d
44、esk surface seat SurfaCe Stature stature range the marking 76 46 180 173 to White (N9.5) 166 e0179 White (N9.5) 73 4 4 . 173 70 42 166 159to172 Blue (2.5 PB 7/51 67 40 159 152 to165 White (N9.5) 64 38 152 145 to158 Green (2.5 G 2 / 5 ) 61 36 145 138 to151 White (N 9.5) 3. The characters of the marki
45、ng label shall be bold face, Arabia numerals, special characters and letters. No. 6 4. The material quality of the marking label shall have durability of such as aluminium alloy, and the label shall be attached securely so as not to peel off and be damaged, attached in an easily visible location on
46、the back face of the container of the desk (if there is no container, the back surface of the top board) and the back face of the back rest of the chair. 131 to144 Yellow (4.5 Y 8.5/14) 58 34 138 Table 7. Classes, compatible stature range, and base color of the marking label Unit: cm 52 No. 8 124 11
47、7 to130 I 6/1) 30 I. No. 10 No. U NO. 71 55 I 32 I 131 I 124to137 I White (N9.5) 46 26 110 103 to116 Red (4 R4.5/14) 43 24 103 to 109 White (N9.5) No. 91 49 I 28 I 117 I 110 to123 I White (N9.5) Remarks: Round off fractions of a centimeter in the compatible stature range. Informative reference: If t
48、he desk and chair selected using this Table interfere with the thighs, a chair of the next lower number may be used. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:40:32 MDTNo reproduction or networking permitted without license from IHS -,-,- 18 s 1021-1991 Fig. 13. Marking labe