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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

Imeundwa na

Martin

23. Oktoba 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.
Juu
2 days

Maagizo

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.

Vifaa kwa hatua hii:

Kasha la mota ya kifaaKasha la mota ya kifaa1 kipande
Nipo yenye hesi ya bombaNipo yenye hesi ya bomba1 kipande

Zana zinazohitajika:

Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa
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.

Vifaa kwa hatua hii:

Mkono wa silindaMkono wa silinda1 kipande
Vali ya kuzuia kurudiVali ya kuzuia kurudi1 kipande
Kinga ya pistoniKinga ya pistoni1 kipande

Zana zinazohitajika:

Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa
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.

Vifaa kwa hatua hii:

Pistoni ya kupigiliaPistoni ya kupigilia1 kipande
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).

Vifaa kwa hatua hii:

Vali kuuVali kuu1 kipande
Pete ya kiti cha valiPete ya kiti cha vali2 vipande
Coil SpringCoil Spring1 kipande
Pete ya OPete ya O2 vipande

Zana zinazohitajika:

Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa
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.

Vifaa kwa hatua hii:

Mkono wa valiMkono wa vali2 vipande
Pistoni ya valiPistoni ya vali1 kipande
Fimbo ya valiFimbo ya vali1 kipande
Coil SpringCoil Spring1 kipande
Pete ya OPete ya O7 vipande

Zana zinazohitajika:

Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa
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.

Vifaa kwa hatua hii:

Kifyatulio cha kifaaKifyatulio cha kifaa1 kipande
Kiwiko cha usalama cha mgusoKiwiko cha usalama cha mguso1 kipande
Coil SpringCoil Spring1 kipande

Zana zinazohitajika:

Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa
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.

Vifaa kwa hatua hii:

Kasha la misumariKasha la misumari1 kipande
Kilishaji cha misumariKilishaji cha misumari1 kipande

Zana zinazohitajika:

Spana inayoweza kurekebishwaSpana inayoweza kurekebishwa
8

Why the valve chambers are small

Inapakia daftari la 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.

Zana zinazohitajika:

Kibana hewaKibana hewa
Bomba la hewaBomba la hewa

Vifaa

17

Zana Zinazohitajika

3

Mchoro huu unatengeneza

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