Double-Knock mechanism

2019-09-22T20:08:29Z

66.97.20.206: /* Double-knock pencil models */

[[File:Double-Knock pencils.JPG|thumb|right|Some double-knock pencils. Left to right: three Niji Grip 350DX (the black one is a vintage model), two Niji Grip 0.9mm, a Pilot Delful The Shaker, and a Serve Swell]]
'''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 ==
{| class="wikitable sortable"
|-
! Brand !! Model name !! Additional Features
|-
| Alvin ||Draft-Tec Retrac ||
|-
| 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
|-
| Aristo || DK2 || Twist-extendable eraser
|-
| Serve || Swell || Twist-extendable eraser
|-
| Cult Pens || Cult Pencil || Side button to retract the tip; metal body
|-
| Stabilo || Microtom 3365 ||
|}

[[Category:Pencil]]
[[Category:Mechanical Pencil]]

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Double-Knock mechanism