desk-and-chair-design.doc

教室桌椅及其布局改进设计一、D9 D308 classroom desks and layout data are as follows ：PARTDATA ITEMDATA/cmchairwidth40length36hight41.5clearance10desk length256width35hight 76hight of drawer60layout Left from the teachers desk 90Right from the rostrum154Width of left aisle 64Width of left aisle 64Width of middle aisle 80Occupy width92Last row and wall70classroomlength1060width780Width of teachers desk100Distance of the outeredge of desk and wall164Width of object stage 30 二、design and calculation of chair and desk：1、 according to the data of Chinese human body posture feet：GB10000-88 18-25 years old 5%-95%：4.1.4The length of forearm 4.6.1the length of hand 4.3.1-4.3.10sitting height 、Cervical vertebra height 、eye height 、shoulder height、elbow height 、Thigh thickness 、Knee height 、height of leg with foot、depth、distance of hips and knee、Lower extremity length 、width of hips 、max width of shoulderDATA ITEMMIN/mmMAX/mmBOYSGIRLSBOYSGIRLSThe length of forearm 216194259253the length of hand170158196183sitting height863811963903Cervical vertebra height513581702658eye height753636851785shoulder height557517641593elbow height227214291283Thigh thickness114113149148Knee height495428535494height of leg with foot386346454408depth423401494468distance of hips and knee516495594568Lower extremity length9258541068978width of hips292306345368max width of shoulder3953594634242、design 1）According to the above data ,set sitting hip width slightly larger values of 350mm and width of 40cm from original chair. In order to avoiding the waste of materials and considering the people sitting under the chair deficiency caused by her legs apart, chair surface is designed a trapezoid, and frontier take 50 cm wide. 2）depth （423+494)*3/8+(401+468)/8=452.75cm Because insufficient deep will make the sitting chair surface pressure too large ,that lead to uncomfortable sitting, while much depth will lean back in a chair uncomfortable, so set sit deep moderate value. considering the male-female ratio, this value is slightly to the boys of 452.75mm, floor to 450mm. Extension length is 450mm with the junction of 50mm slot, so the chair surface actual extension of 400mm. 3）Leg and foot high ： （386+454）*3/8+（346+408）/8=409.25 Calf and foot high and moderate values of 409.25mm, Ceiling to 409mm .considering that rounding sole high 21mm , so takes the chair high 430mm. 4）elbow height （227+291)*3/8+(214+283)/8=256.375mm Considerations to elbow height is more comfortable and easy adjusting pad elbow wood block round the fare up to 260mm 5）Lower extremity length Consider the largest sitting lower extremity length 1068mm 。 sqr(（1068-450）2-4302)+450=443.87+450=893.87mm To round up the 900mm, plus a table wood thickness 50mm table spacing 950mm 6）Cervical point height （513+702）*3/8+（581+658）/8=610.5mm Integer 610mm. The back curve length 610mm considering the chair back and the chair surface angle 115 degree comparatively rightly. 610*sin(75/180*3.14)=552.8mm To round up 550mm, chair of high 430mm, after a row of the height of the desktop and the front row of ground height difference is 980mm. Sqr（6102-5502）=263.8mm约为264mm 7) Forearm hand length length (216+259+170+196)*3/8+(194+235+158+183)/8=411.625mm Integer 410mm table width 410mm 8）Table height The original classroom desktop with the height 760mm is suitable. The data do not need changes. 9）Step height 980-760=220mm 10）Drawer 1 Knee height ： （459+535）*3/8+（428+494）/8=488mm The other highly 488*2-409=576mm The original drawer height 600mm no need to change 2 distance of hips and knee （516+594）*3/8+ （495-568）/8=549.125mm To round up to 550mm 900mm-550mm= 350mm A drawer depth 350mm 11）max width of shoulder Students with be affected due to distance near seriously, here take a larger value of 450mm.Considering that laying on the table will make elbow external ,plus with 150mm to 600mm. 三、To make design details of chair and desk perfect 1. The chair surface fold knocking noise always recall from time to time, it will affect the study of students are observed to fold the chair, after the connection of the collision, considering material attached to TPEE ( thermoplastic polyester elastomer ) the material is block copolymer contain polyester hard segment and polyether soft segment for producing plastic noise reduction gear, TPEE has the elasticity of the rubber and engineering plastics strength. 2 The original chair surface is smooth wood, look to the projector screen time easily slipped, considered in the chair surface embedded in even arrangement cloth cushion, can slip and comfortable 3 When look up , the touch of head and later card table edges is not a comfortable thing, add potholder to the edge of table 四、layout design of classroom Available width 780-30*2=720cm Due to（二.2.11），A student occupy of width 60cm, the left and right aisle are 80cm , part 4 people per row. Available length Left 90+92*8+70=896cm Right 154+92*8+70=960cm Due to（二.2.5）the distance of two desk is 95cm and there are 7 row ，right: 960-95*7=295cm Considering the original classroom right of first row distance platform 150cm ,here person flow is larger and sometimes this place can take as a stage ,classroom performance applicable is design for 175cm, so the last row of the distance from the wall is 295-175-26.4=93.6 93.6cm is slightly s