| 摘要 |
A mechanism for automatically adjusting the chamber length in a writing instrument to accommodate refills of different lengths. The mechanism comprises a first element and a second element operably engaged with the first element. When contacted by a refill, the second element automatically moves from a first position associated with a first chamber length to a second position associated with a second chamber length. The mechanism may have a biasing member to releasably hold the second element in the first position. In one embodiment, the automatically-adjusting refill seat mechanism has a third element that fits in the second element, and is operably and movably engaged with the first and second elements. When contacted by a refill, the third element automatically moves from a first position associated with a first chamber length to a second position associated with a second chamber length. In another embodiment, an automatically-adjusting refill seat mechanism having three elements forms a third chamber length when the second element is contacted by a refill which does not contact the first or second elements, and the second element automatically moves to a third position. In other embodiments, the first element may be a rod, the second element may be a sleeve, and the third element may be a seat. A method of using an automatically-adjusting refill seat mechanism is also disclosed.
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