Difference between revisions of "Double-Knock mechanism"

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! Brand !! Model name !! Additional Features
 
! Brand !! Model name !! Additional Features
 
|-
 
|-
−
| Alvin ||Draft-Tec Retrac ||
+
| Alvin ||Draft-Tec Retrac || 4mm drafting tip
 +
|-
 +
| Aristo || DK2 || Twist-extendable eraser
 +
|-
 +
| Baile || Double Nib 538 ||
 
|-
 
|-
 
| Colleen ||Jib WK-816 ||
 
| Colleen ||Jib WK-816 ||
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| Colleen ||Jib WK-1051||
 
| Colleen ||Jib WK-1051||
 
|-
 
|-
−
| Pilot || Vanishing Point || Lead hardness indicator
+
| Cult Pens || Cult Pencil || Side button to retract the tip; metal body
 +
|-
 +
| Fuji Corona ||No. 205-03 Mecha-Pen || 4mm drafting tip
 +
|-
 +
| Linex || DP 1000|| Side button to retract the tip
 +
|-
 +
| Linex || DP 2000|| Twist-extendable eraser; 4mm drafting tip
 +
|-
 +
| Manufactum || Druckbleisift Messing|| Side button to retract the tip
 +
|-
 +
| Niji || Grip 350DX || Twist-extendable eraser
 +
|-
 +
| Ohto || Horizon || Auto advance mechanism; side button to retract the tip; metal body
 +
|-
 +
| Ohto || OP-500<ref>https://unsharpen.com/what-is-a-double-knock-pencil/</ref> || Spring loaded clip to retract the tip
 +
|-
 +
| Olympia || Double Knock ||
 +
|-
 +
| Pacific Arc || RDP-405 ||
 +
|-
 +
| Pacific Arc || RDP-605 || Twist-extendable eraser
 
|-
 
|-
−
| Pilot || Automac || Auto advance mechanism; metal body
+
| Paper Mate || Apex || Twist-extendable eraser
 
|-
 
|-
−
| Pilot || Delful The Shaker || [[Shaker mechanism]] with lead lock when the tip is retracted
+
| Penac || Double Knock ||
 
|-
 
|-
 
| Pentel || Graph Gear 1000 || Spring loaded clip to retract the tip; metal body; lead hardness indicator
 
| Pentel || Graph Gear 1000 || Spring loaded clip to retract the tip; metal body; lead hardness indicator
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| Pentel || TranXition || Spring loaded clip to retract the tip
 
| Pentel || TranXition || Spring loaded clip to retract the tip
 
|-
 
|-
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| [[Rotring]] || Rapid || Twist-extendable eraser
+
| Pensan || IQ - My-IQ - IQ Duo || Twist-extendable eraser. Ergonomic double injection grip section made by Kotobuki Co. Ltd Japan.
 +
|-
 +
| 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
 +
|-
 +
| Platinum || W-Knock MH-120 ||
 
|-
 
|-
−
| Niji || Grip 350DX || Twist-extendable eraser
+
| Pyramid || SP-60 Double Knock ||
 
|-
 
|-
−
| Ohto || Horizon || Auto advance mechanism; side button to retract the tip; metal body
+
| [[Rotring]] || Esprit double push R5033312 || Side button to retract the tip
 
|-
 
|-
−
| Paper Mate || Apex || Twist-extendable eraser
+
| [[Rotring]] || Initial R504340 ||
 
|-
 
|-
−
| Aristo || DK2 || Twist-extendable eraser
+
| [[Rotring]] || Rapid || Twist-extendable eraser
 
|-
 
|-
 
| Serve || Swell || Twist-extendable eraser
 
| Serve || Swell || Twist-extendable eraser
 
|-
 
|-
−
| Cult Pens || Cult Pencil || Side button to retract the tip; metal body
+
| Senator || Avantic ||
 +
|-
 +
| Spaper || Technic Retro ||
 
|-
 
|-
 
| Stabilo || Microtom 3365 ||  
 
| Stabilo || Microtom 3365 ||  
 +
|-
 +
| Staedtler || Retro 778 ||
 +
|-
 +
| Staedtler || Retro de Luxe 778 25 || Premium chromed steel body
 +
|-
 +
| Sun-Star || W Knock Sharp ||
 +
|-
 +
| Tomato || Hidden Nib HN-50 ||
 +
|-
 +
| Tombow || Protect SH-WPS ||
 +
|-
 +
| You & Me || DBL-KNOCK ||
 
|}
 
|}
  
 
[[Category:Pencil]]
 
[[Category:Pencil]]
 
[[Category:Mechanical Pencil]]
 
[[Category:Mechanical Pencil]]

Latest revision as of 10:54, 12 June 2023

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[edit]

Brand Model name Additional Features
Alvin Draft-Tec Retrac 4mm drafting tip
Aristo DK2 Twist-extendable eraser
Baile Double Nib 538
Colleen Jib WK-816
Colleen Jib WK-1051
Cult Pens Cult Pencil Side button to retract the tip; metal body
Fuji Corona No. 205-03 Mecha-Pen 4mm drafting tip
Linex DP 1000 Side button to retract the tip
Linex DP 2000 Twist-extendable eraser; 4mm drafting tip
Manufactum Druckbleisift Messing Side button to retract the tip
Niji Grip 350DX Twist-extendable eraser
Ohto Horizon Auto advance mechanism; side button to retract the tip; metal body
Ohto OP-500[1] Spring loaded clip to retract the tip
Olympia Double Knock
Pacific Arc RDP-405
Pacific Arc RDP-605 Twist-extendable eraser
Paper Mate Apex Twist-extendable eraser
Penac Double Knock
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
Pensan IQ - My-IQ - IQ Duo Twist-extendable eraser. Ergonomic double injection grip section made by Kotobuki Co. Ltd Japan.
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
Platinum W-Knock MH-120
Pyramid SP-60 Double Knock
Rotring Esprit double push R5033312 Side button to retract the tip
Rotring Initial R504340
Rotring Rapid Twist-extendable eraser
Serve Swell Twist-extendable eraser
Senator Avantic
Spaper Technic Retro
Stabilo Microtom 3365
Staedtler Retro 778
Staedtler Retro de Luxe 778 25 Premium chromed steel body
Sun-Star W Knock Sharp
Tomato Hidden Nib HN-50
Tombow Protect SH-WPS
You & Me DBL-KNOCK
  1. ↑ https://unsharpen.com/what-is-a-double-knock-pencil/
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