IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0614066
(2006-12-20)
|
등록번호 |
US-7293684
(2007-11-13)
|
우선권정보 |
TW-95142058 A(2006-11-14) |
발명자
/ 주소 |
|
출원인 / 주소 |
|
인용정보 |
피인용 횟수 :
15 인용 특허 :
15 |
초록
▼
A pneumatic nail gun includes a gun body with a trigger, collecting a compressed high pressure air with a constant pressure, a movable cylinder installed in the gun body, a hitting piston disposed in the cylinder, a valve ring formed outside the cylinder, a head valve disposed on the top of the cyli
A pneumatic nail gun includes a gun body with a trigger, collecting a compressed high pressure air with a constant pressure, a movable cylinder installed in the gun body, a hitting piston disposed in the cylinder, a valve ring formed outside the cylinder, a head valve disposed on the top of the cylinder, at least one return passage formed outside the cylinder, and a valve bolt disposed in the return passage. Before the trigger is pressed, the high pressure air drives the valve ring to keep the cylinder at the upper position to close the head valve. When the trigger is pressed, the high pressure air drives the cylinder move downwardly to open the head valve for guiding the high pressure air to drive the piston downwardly move to hit nails. When the trigger is released, the high pressure air drives the valve bolt open for guiding the high pressure air via the return passage to drive the piston rapidly move upwardly to reposit.
대표청구항
▼
What is claimed is: 1. A pneumatic nail gun comprising: a gun body having a movable cylinder installed therein, a hitting piston disposed in the cylinder to divide the cylinder into a top cylinder chamber and a bottom cylinder chamber, a main air housing formed in the gun body for accumulating comp
What is claimed is: 1. A pneumatic nail gun comprising: a gun body having a movable cylinder installed therein, a hitting piston disposed in the cylinder to divide the cylinder into a top cylinder chamber and a bottom cylinder chamber, a main air housing formed in the gun body for accumulating compressed air at a high pressure, a trigger valve being disposed at one end of the main air housing to be driven by a trigger disposed on the gun body to drive the hitting piston to downwardly move to hit nails and upwardly move to reposit; a head valve disposed on the top of the cylinder; a valve ring disposed on an outer wall of the cylinder so that a middle chamber is formed between the valve ring and an inner wall of the gun body to accumulate high pressure air therein, wherein before the trigger is pressed, the high pressure air pushes the cylinder to move upwardly to make the head valve close air communication between the main air housing and the top cylinder chamber, and when the trigger is pressed, the middle chamber discharges air and the cylinder moves downwardly driven by the high pressure air in the main air housing to make the head valve open the air communication between the main air housing and the top cylinder chamber so as to guide the high pressure air driving the piston to downwardly move to hit nails; and a return passage formed on the outer wall of the cylinder to drive the piston to upwardly move for reposition, which is connected between the main air housing and the bottom cylinder chamber and includes a valve bolt therein, wherein when the trigger is released, the valve bolt is driven by the high pressure air to open the return valve opening so that the high pressure air in the main air housing is guided to the bottom cylinder chamber to continuously drive the piston to rapidly move upwardly for reposition. 2. The pneumatic nail gun as claimed in claim 1, wherein the head valve includes a main valve opening and an air tight ring disposed thereon, a rib wall being formed in the gun body; wherein before the cylinder downwardly moves, the air tight ring is closely attached on the annular rib wall to close the air communication between the main air housing and the top cylinder chamber via the main valve opening, and when the cylinder downwardly moves, the air tight ring is away from the annular rib wall to open the air communication via the main valve opening. 3. The pneumatic nail gun as claimed in claim 1, wherein an annular rib is formed inside the head valve at a top surface, and the gun body has a buffer pad disposed in the top portion and a top exhausting hole formed on the top surface for connecting with atmosphere; wherein before the cylinder downwardly moves, the annular rib opens air communication through the top exhausting hole for discharging the high pressure air in the top cylinder chamber, and when the cylinder downwardly moves, the annular rib contacts the buffer pad to close the air communication through the top exhausting hole. 4. The pneumatic nail gun as claimed in claim 1, wherein a spring is disposed in the middle chamber to assist the high pressure air in the middle chamber for pushing the cylinder, and a pushing force of the spring is less than that of the high pressure air in the main air housing to drive the cylinder to move downwardly. 5. The pneumatic nail gun as claimed in claim 1, wherein the valve bolt divides the return passage into a top passage, a middle valve chamber, and a bottom passage, the top passage is connected with the main air housing via a top through hole formed beside the cylinder for guiding the high pressure air into the top passage for accumulation, the middle valve chamber is connected with the main air housing via a bottom through hole beside the cylinder for guiding the high pressure air into the middle valve chamber for accumulation, the middle valve chamber is connected with the bottom passage via a return valve opening, and the valve bolt controls the return valve opening to open and close. 6. The pneumatic nail gun as claimed in claim 5, wherein the cylinder further includes at least one ear portion, the ear portion includes an ear hole, the return passage is at least disposed in the ear hole, and the bottom through hole is disposed on the ear portion. 7. The pneumatic nail gun as claimed in claim 5, wherein the cylinder further includes at least one ear portion, the ear portion includes an ear hole, the return passage is at least disposed in the ear hole, an annular cover is covered on the top of the ear portion, the top passage is formed in an area surrounded between in the ear hole at the top of the valve bolt and the annular cover, the top through hole is disposed on the annular cover or the ear portion, and the bottom through hole is disposed on the ear portion. 8. The pneumatic nail gun as claimed in claim 5, wherein a spring is disposed in the top passage to assist the high pressure air in the top passage pushing the valve bolt and a for pushing force of the spring is less than that of the high pressure air in the middle chamber to drive the valve bolt to move upwardly to open the return valve opening. 9. The pneumatic nail gun as claimed in claim 5, wherein the bottom passage connects to the bottom cylinder chamber via at least one bottom valve hole formed on the cylinder. 10. The pneumatic nail gun as claimed in claim 9, wherein an air tight ring is disposed on the outer wall of the cylinder near the bottom valve hole and a bottom exhausting hole formed in the gun body is for connecting to atmosphere, the air tight ring closes air communication from the bottom cylinder chamber to the bottom exhausting hole through the bottom valve hole before the cylinder moves downwardly, and the high pressure air in the bottom cylinder chamber is discharged after the cylinder moves downwardly to open the air communication. 11. The pneumatic nail gun as claimed in claim 9, wherein the bottom passage connects to the bottom valve hole via a lower chamber formed between the inner wall of the gun body and the outer wall of the cylinder. 12. The pneumatic nail gun as claimed in claim 11, wherein a spring is disposed in the lower chamber to assist moving cylinder upwardly, and a pushing force of the spring is less than that of the high pressure air in the main air housing to drive the cylinder move downwardly. 13. The pneumatic nail gun as claimed in claim 1, wherein the cylinder further includes at least one ear portion, an annular cover is covered on a top of the ear portion, the annular cover has a first push surface with a first area exposed in the main air housing, the valve ring has a second push surface with a second area exposed in the middle chamber, and the first area is smaller than the second area. 14. The pneumatic nail gun as claimed in claim 13, wherein the valve bolt has a third push surface with a third area exposed in the top passage and a fourth push surface with a fourth area exposed in the middle valve chamber, and the third area is larger than the fourth area. 15. The pneumatic nail gun as claimed in claim 1, wherein the cylinder further includes at least one top valve hole connecting with the top passage, and the piston opens and closes the top valve hole to control air communication to the top cylinder chamber. 16. The pneumatic nail gun as claimed in claim 1, wherein the cylinder further includes at least one top valve hole connecting with the top passage via a top passage formed at a top of the valve bolt in the return passage and a top through hole formed on a side of the top passage, and the piston opens and closes the top valve hole to control air communication to the top cylinder chamber. 17. The pneumatic nail gun as claimed in claim 1, wherein a guiding hole is formed in the valve ring on the outer wall of the cylinder, a nail pushing passage is formed in the gun body, and the guiding hole is connected between the cylinder and the gun body.
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