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Pneumatic Nail Gun: Main Valve, Return Chamber and Fast Trigger Valve
Y. Komazaki, Y. Ishizawa, M. Nishida (Hitachi Koki Co.) · Public domain (expired patent)
Martin

Yaremwe na

Martin

23. Ukwakira 2026NO
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Pneumatic Nail Gun: Main Valve, Return Chamber and Fast Trigger Valve

Hitachi Koki's air nailer (US 7,156,012, 2007). Compressed air stored in the handle holds a main valve shut over the cylinder. Pulling the trigger with the nose pressed to the work vents a small trigger-valve chamber, which vents the main-valve chamber; the main valve jumps up, closes the exhaust and lets stored air throw the piston and driver blade down onto a nail. Air caught below the piston in a return chamber pushes it back up. Hitachi sized the valve chambers against their vents to make the gun fire and reset faster. The patent gives no materials, bore, stroke, air pressure or nail size. The picture: the patent's Fig. 1.
Hejuru
2 days

Amabwiriza

1

Use the one-piece frame, handle and nose

Use a frame (60), handle (60A) and nose (41) made as one outer frame; the space inside the handle and frame is the air accumulator (2). Screw a hose nipple into the handle's end for the air hose.

Ibikoresho by'iyi ntambwe:

Igikonoshwa cya moteri y’igikoreshoIgikonoshwa cya moteri y’igikoresho1 igice
Nipeli y’umuyoboro ifite inyugutiNipeli y’umuyoboro ifite inyuguti1 igice

Ibikoresho bikenewe:

Isupana ihindukaIsupana ihinduka
2

Fit the cylinder with its return chamber

Fit the cylinder (3) in the frame with a return chamber (33) round its lower part. Halfway up, a one-way valve (34) lets air pass only from the cylinder into the return chamber; a channel (36) near the bottom joins them always. Seat a piston bumper (37) at the bottom.

Ibikoresho by'iyi ntambwe:

Umuyoboro wa silindiriUmuyoboro wa silindiri1 igice
Valve idasubira inyumaValve idasubira inyuma1 igice
Agasego ka pisitoniAgasego ka pisitoni1 igice

Ibikoresho bikenewe:

Isupana ihindukaIsupana ihinduka
3

Insert the piston and driver blade

By hand, slide the piston (4a) with its integral driver blade (4b) into the cylinder; the blade's free end (4c) runs down the nose to strike the nail.

Ibikoresho by'iyi ntambwe:

Pisitoni ikubitaPisitoni ikubita1 igice
4

Fit the main valve section

Over the top of the cylinder fit the main valve rubber (27), the main valve (19) with O-rings (31, 32) sliding in the main valve chamber (8), the main valve spring (28) pushing it down, and the exhaust rubber (30) under the exhaust passage (29) to the top exhaust hole (49).

Ibikoresho by'iyi ntambwe:

Vale nkuruVale nkuru1 igice
Impeta y'intebe ya valeImpeta y'intebe ya vale2 ibice
Coil SpringCoil Spring1 igice
Impeta ya O y’ikoroboyiImpeta ya O y’ikoroboyi2 ibice

Ibikoresho bikenewe:

Isupana ihindukaIsupana ihinduka
5

Fit the trigger valve

At the base of the handle fix an outer and an inner valve bush (10, 11). Inside them fit the valve piston (9) and the plunger (7), with a spring (12) between them pushing the piston up and the plunger down, and O-rings 15, 17, 18, 21, 23, 24, 25. Join it to the main valve chamber by the control channel (40), a tube with a gentle bend.

Ibikoresho by'iyi ntambwe:

Umuyoboro wa valeUmuyoboro wa vale2 ibice
Pisitoni ya valePisitoni ya vale1 igice
Inkoni ya valveInkoni ya valve1 igice
Coil SpringCoil Spring1 igice
Impeta ya O y’ikoroboyiImpeta ya O y’ikoroboyi7 ibice

Ibikoresho bikenewe:

Isupana ihindukaIsupana ihinduka
6

Fit trigger, arm plate and push lever

Fit the trigger (39) with its pivoting arm plate (48) under the plunger, and the push lever (42) sprung out from the nose bottom. Only with both pulled and pressed does the arm plate push the plunger up.

Ibikoresho by'iyi ntambwe:

Imbarutso y’igikoreshoImbarutso y’igikoresho1 igice
Inkoni y'umutekano yo gukorahoInkoni y'umutekano yo gukoraho1 igice
Coil SpringCoil Spring1 igice

Ibikoresho bikenewe:

Isupana ihindukaIsupana ihinduka
7

Fit the magazine and feeder

Fit the magazine (44), holding nails side by side, with the feed mechanism (45) that moves each next nail into the injection opening (46) in the nose.

Ibikoresho by'iyi ntambwe:

Igisanduku cy'imisumariIgisanduku cy'imisumari1 igice
Igisunika imisumariIgisunika imisumari1 igice

Ibikoresho bikenewe:

Isupana ihindukaIsupana ihinduka
8

Why the valve chambers are small

Gupakira ikaye ya Jupyter…
9

Connect and fire

Ours: connect an air hose from a compressor. At rest the stored air holds the main valve down and the piston up. Press the nose to the work and pull the trigger: the main valve lifts, the piston drives the nail, and the return-chamber air brings it back up.

Ibikoresho bikenewe:

Igikandamiza umwukaIgikandamiza umwuka
Umupira w'umwukaUmupira w'umwuka

Ibikoresho

17

Ibikoresho bikenewe

3

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