| 摘要 |
<p>A stack (12) of sheets (13) is attached to a support (6) adaptable on the upper face (2) of a closet seat (3). After each use, the upper sheet of the stack (12) is removable, disclosing the next sheet which is ready for use. Each sheet contains at least one component which is sensitive to a parameter of use and alters the appearance and especially the colour of the sheet already subjected to use as the upper sheet of the stack. The parameters of use are the presence of urine or perspiration, and, in particular, urea, body heat, the weight of the person sitting on the seat, the presence of liquid and the like. Where a temperature or body weight-sensitive component is used, means are provided for protecting the other sheets located under the upper sheet from the effect of temperature or body weight. The user is assured as to the cleanliness of the sheets, whereby wastage is reduced.</p> |
