| 摘要 |
PURPOSE:To make clear an indication and to prevent a false indication by providing an engaging member and a regulating member so that a movable body is projected at one stroke only when the air pressure in a tire falls below a set value. CONSTITUTION:A concave part 29 for engagement is provided inside a movable body 11, while a regulating member 49 is provided on a fixed body 9. Moreover, a concave part 63 for recess is provided outside the regulating member 49, and a constitution is made so that a ball-shaped engaging member 31 engages with the concave part 29 for engagement so as to prevent the projection of the movable body 11 when the air pressure in a tire exceeds a set vlue, and that the regulating member 49 slides in response to the reversal of a metal diaphragm 37, the engaging member 31 being fitted in the concave part 63 for recess through a ball guide hole 27 so as to release the engagement with the movable body 11, and thereby the movable body 11 being projected at one stroke by a spring 19, when said pressure falls below the set value. This constitution enables the prevention of the projection of the movable body 11 due to vibrations or a shock, and the clear and accurate indication. |
