| 摘要 |
<p>A pressure indicator, for example for a football or tyre, has a translucent display diaphragm (4) and an indicator diaphragm (5) with a distinctive pattern or symbol, which together form a compartment (6) containing an opaque liquid or gel. When a change in pressure is applied to the diaphragms (4, 5), relative movement between the diaphragms (4, 5) is caused which causes the liquid or gel to be displaced and the symbol or pattern on the indicator diaphragm (5) to be seen through the translucent display diaphragm (4).</p> |
