A device applicable to the handles for double equipment of writing instruments, which essentially consists of a cord of thin elastic wire, wound in a spiral, which for each of its ends subject to the support of the writing element, of reduced proportions; this wire is fitted to the groove of a grooved pulley supported by a shaft fixed to the rear end of the wrapping handle, so that, from the outside, the pulley can be rotated and one of the writing elements protruded through the toe cap, both the opposite recedes. (Machine-translation by Google Translate, not legally binding)
展开▼
