| 摘要 |
The invention provides a control mechanism for the advancing and withdrawal of a functioning part displaceable in a housing against or under the influence of a spring and for locking the part alternately in an advanced and withdrawn position. The mechanism is of a construction which enables it to be made relatively small and of a few parts, e.g. of injection molded plastic, so as to take up little space and is particularly suitable for use in a writing implement for advancing and withdrawing a writing cartridge within the housing of the implement. |
