| 摘要 |
A pop-up thermometer having an elongate housing (11e) with a longitudinally extending bore, a plurality of internal neck regions (24e, 25e, 84), a plurality of internal cavities (25e, 27e, 85). The neck regions each have a minimum diameter portion and a neck locking surface (88) extending outwardly from the minimum diameter portion of neck. An indicator rod (36e) slidably disposed in the bore of the housing includes at least one stem stretch (38e) having a diameter less than the remainder of the bore and a stem locking surface (97) extending outwardly from said stretch. A fusible material fills the cavities. When the fusible material is in solid form, the neck locking surface exerts a substantially downward directed force on said stem locking surface on the rod to resist upward movement of the rod relative to the housing.
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