The anti-bending of measuring piece strains at fixed structure on a kind of bed,There is the bedcover of elastic band with one of the rectangular periphery of air permeable waterproof material,Intersect between the upper semisection bottom surface quadrangle of bedcover to be diagonally respectively connected to an elastic webbing,The upper half of bedcover top surface is the two sides that half part has layer of cloth on one between two sides with the suture bridging of sewing,And on what layer of cloth top margin and periphery have each reserved left notch in the top margin two sides of bedcover,Outside one right indentation, there,Also with the stitch bond of sewing between upper layer of cloth and periphery bedcover adjacent top side,The upper half of the lower semisection top surface of bottom layer is that suture bridging of the half part between two sides again with sewing has layer of cloth； There is a positioning elastic webbing in four corners of bedcover； There is the opening of a row at equal intervals on positioning elastic band,And positioning elastic band edge has a button； It is inserted in upper layer of cloth when going up measuring piece upper end for one,Lower end passes through lower layer of cloth Hou,The perforation of measuring piece quadrangle ear buckles what button by positioning elastic band adjustment opening on bed,The elastic webbing of bedcover is passed through the fixed what of mattress at upper half again,When bending mattress upper half what,The smooth of measuring piece on bed is not influenced.一種床上測量件之防彎緊拉固定結構，具有透氣防水材質方形之一周邊具有鬆緊帶之床罩，床罩之上半段底面四角間交叉以對角各接有一彈性帶，床罩頂面之上半為二分之一部份在兩側間以車縫之縫線跨接有一上布層之兩側邊，且於上布層頂邊與周邊具有床罩之頂邊兩側各預留一左缺口、一右缺口處外，上布層與周邊床罩相鄰頂邊間亦以車縫之縫線接合，底部層之下半段頂面之上半為二分之一部份在兩側間又以車縫之縫線跨接有一下布層；在床罩之四角落都有一定位彈性帶；定位彈性帶上有一排等間隔之開口，且定位彈性帶端有一鈕扣；當將一床上測量件上端套入上布層，下端穿過下布層後，床上測量件四角耳部穿孔由定位彈性帶調整開口扣於鈕扣處，再把床罩之彈性帶穿過床墊固定於靠上半處，使床墊上半於彎折時，不影響床上測量件之平整。
