Double-Knock mechanism
Double-knock or vanishing point (also dual action), is a particular type of mechanism that allow the tip of a mechanical pencil to fully retract inside the body of the pencil. In a double-knock pencil, a deep click of the push button extends the whole tip section, while further short clicks allow the lead to come out (like a regular mechanical pencil). In order to retract back the tip (when it's in the extended position), usually another deep push of the button is needed.
Double-knock pencil models
Brand | Model name | Additional Features |
---|---|---|
Pilot | Vanishing Point | Lead hardness indicator |
Pilot | Automac | Auto advance mechanism; metal body |
Pilot | Delful The Shaker | Shaker mechanism with lead lock when the tip is retracted |
Pentel | Graph Gear 1000 | Spring loaded clip to retract the tip; metal body; lead hardness indicator |
Pentel | Technica-X | |
Pentel | Flex Fit | Spring loaded clip to retract the tip; ergonomic rubber grip (also customisable in the Flex Fit II) |
Pentel | TranXition | Spring loaded clip to retract the tip |
Rotring | Rapid | Twist-extendable eraser |
Niji | Grip 350DX | Twist-extendable eraser |
Ohto | Horizon | Auto advance mechanism; side button to retract the tip; metal body |
Paper Mate | Apex | Twist-extendable eraser |
Serve | Swell | Twist-extendable eraser |
Cult Pens | Cult Pencil | Side button to retract the tip; metal body |
Stabilo | Microtom 3365 |