Antibreaking pen

The utility model relates to an anti-breaking pen, which can prevent nib broken. The utility model is characterized in that the pen arm comprises two parts of the upper and the lower, and it has a top, an edge internal circular slot, and a spring cushion; a pen core has a jacking block and a pushing block, whose lower part is provided with a spring on the outer face; the pen core outer face is slidingly provided with a pin seat with two pin holes, the pin holes are provided with pins and springs, one end of the spring is fixed to the inner end of the pin, while the other end attaches on the inner circle of the pen arm, the coning of the pin inner end matches with the coning of active weight, so when the weight falls, it presses the pin seat moving down, then the pushing block pushes the pen core moving down, so the nib extends from the nib hole, and the pushing block presses the pen core outer spring until the outer end of the pin enters the slot; the jacking block of the pen core is hinged with a one piece control member comprising a latch hook element, a hook element, and an opening hook element; when the pen arm reverses or positions in horizontal or falls in the gravitational effect, the pin spring pushes the pin off the slot, the pen core spring moves up the pen core, the nib enters the nib hole, the end of the latch hook element clashes with the top, and the hook element hooks the top by rotation; when the when the weight goes upward to encounter the opening hook element, the hook element can be opened by reversing rotation.