The present invention relates to a pneumatic tool, and more particularly to a shock absorption structure of the pneumatic tool.
Conventional pneumatic tools contain a reciprocating pneumatic tool and a rotatable pneumatic tool, wherein the reciprocating pneumatic tool contains an impact element pushed by high pressure gas to repeatedly strike a workpiece, and the workpiece is driven to move reciprocately, thus cutting, punching, and drilling the workpiece.
With reference to
However, as the impact element 40 of the conventional pneumatic tool is pushed backward to hit the gas valve unit 20, a reaction force passes toward user's hands repeatedly to cause using fatigue and to injure user's wrists.
To improve above-mentioned defects, a spring is accommodated in the cavity of the cylindrical portion so as to absorb vibration as the impact element 40 moves backward, thus reducing the reaction force which passes toward the user's hands. However, the spring cannot effectively reduce the reaction force which passes toward the user's hands, and the spring produces using fatigue and is replaced frequently.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages.
The primary objective of the present invention is to provide a shock absorption structure of a pneumatic tool which contains the cylinder slidably disposed in the cavity of the body, the air chamber is defined in the cavity of the body, the air chamber accommodates the elastic unit, and when the impact element hits the air chamber backward, it drives the cylinder to move in the cavity, and the elastic unit and the air chamber press simultaneously so as to produce double shock absorption and to reduce a reaction force toward the user's hands, thus operating the pneumatic tool easily and protecting the user's wrists.
Another objective of the present invention is to provide a shock absorption structure of a pneumatic tool which contains the air chamber defined in the cavity of the body, and the air chamber accommodates the elastic unit and mates with the elastic unit so as to press simultaneously and to produce the double shock absorption, hence the elastic unit does not have elasticity fatigue and is not replaced often, after being used repeatedly.
Accordingly, a shock absorption structure of a pneumatic tool provided by the present invention contains: a body, a cylinder, a gas valve unit, an impact element, and an elastic unit.
The body includes an air channel configured to flow high pressure gas, and the body includes a cavity defined in the body, the cavity has a closing face formed on a first end thereof, and the cavity has an opening defined on a second end of the body opposite to the first end of the cavity. The body also includes a first orifice passing through the cavity, the body includes a second orifice communicating with the air channel and the cavity, and the first orifice accommodates a limitation element, a part of which extends to the cavity.
The cylinder is movably fixed in the cavity of the body and a part of the cylinder extends out of the body from the opening of the cavity. The cylinder includes a sliding room defined in the cylinder, and the cylinder includes a contacting fringe arranged on one end of the cylinder facing the closing face of the cavity of the fitting sleeve, the cavity of the body has an air chamber defined between the contacting fringe and the closing face. The cylinder has a defining cutout formed on an outer wall of the cylinder corresponding to the first orifice of the body, and the defining cutout accommodates a part of the limitation element which inserts through the first orifice, hence the cylinder straightly slides forward and backward within a predetermined range. The cylinder also includes an air inlet defined on the outer wall of the cylinder corresponding to the second orifice of the body, and the air inlet is in communication with the second orifice within a sliding range of the cylinder.
The gas valve unit is fixed between the sliding room of the cylinder and the contacting fringe so as to control a flowing direction of the high pressure gas.
The impact element is disposed in the sliding room of the cylinder and being pushed by the high pressure gas to move reciprocately.
The elastic unit includes an elastic pushing force and is secured in the air chamber of the body so as to push against the closing face of the cavity and the contacting fringe of the cylinder and to push the cylinder to move away from the grip handle.
The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.
With reference to
The body 1 includes an air channel 11 configured to flow high pressure gas, and the body 1 includes a grip handle 12 and a fitting sleeve 13 fitted with the grip handle 12, wherein the fitting sleeve 13 has a cavity 130 defined therein, the cavity 130 has a closing face 131 formed on a first end thereof and has an opening 132 defined on a second end thereof opposite to the first end of the cavity 130. The opening 132 has a shoulder 1321 extending inward therefrom, the fitting sleeve 13 has a first orifice 133 passing through the cavity 130 and has a second orifice 134 communicating with the air channel 11 and the cavity 130, wherein the first orifice 133 accommodates a limitation element 135 which screws with a fixing nut 135a and extends to the cavity 130 (In this embodiment, the limitation element 135 screws with the first orifice 133).
The cylinder 2 is comprised of a slidable bushing 21 and a hollow column 22, wherein the slidable bushing 21 is movably fixed in the cavity 130 of the fitting sleeve 13, and the fitting bushing 21 has a hollow portion 210 defined therein, the hollow portion 210 has a closed contacting fringe 211 arranged on one end thereof adjacent to the closing face 131 of the cavity 130 of the fitting sleeve 13. The cavity 130 of the body 1 has an air chamber 136 defined between the contacting fringe 211 and the closing face 131, the slidable bushing 21 has an elongated defining cutout 212 formed on an outer wall thereof corresponding to the first orifice 133 of the body 1, and the defining cutout 212 accommodates a part of the limitation element 135 which inserts through the first orifice 133, hence the slidable bushing 21 straightly slides forward and backward within a predetermined range and does not rotate. The slidable bushing 21 also has an air inlet 213 defined on the outer wall thereof corresponding to the second orifice 134 of the body 1 and communicating with the hollow portion 210, and the air inlet 213 is in communication with the second orifice 134 within a sliding range of the slidable bushing 21, wherein a first end of the hollow column 22 inserts into the hollow portion 210 of the slidable bushing 21 and retains with a bolt 221 in a screwing manner, and the first end of the hollow column 22 is connected with the slidable bushing 21 so that the hollow column 22 moves forward and backward in the cavity 130 of the fitting sleeve 13 with the slidable bushing 21. A part of a second end of the hollow column 22 extends out of the fitting sleeve 13 so as to connect with a workpiece (not shown) from the cavity 130 of the fitting sleeve 13, and the hollow column 22 has a sliding room 220.
The gas valve unit 3 is fixed between the hollow column 22 of the cylinder 2 and the contacting fringe 211 of the slidable bushing 21 so that the high pressure gas flows into the gas valve unit 3 from the air channel 11 of the body 1 via the second orifice 134 and the air inlet 213 of the slidable bushing 21, and the gas valve unit 3 controls a flowing direction of the high pressure gas (the gas valve unit 3 is a prior art, so further remarks are omitted).
The impact element 4 is disposed in the sliding room 220 of the hollow column 22 so as to reciprocately move forward and backward, after the impact element 4 is pushed by the high pressure gas.
The elastic unit 5 includes an elastic pushing force (in this embodiment, the elastic unit 5 are multiple springs 51 mating with multiple sheaths 52) and is secured in the air chamber 136 of the body 1 so as to push against the closing face 131 of the cavity 130 of the body 1 and the contacting fringe 211 of the cylinder 2 and to push the cylinder 2 to move away from the grip handle 12 (the front side 100A).
Referring further to
Referring further to
Thereby, the shock absorption structure of the present invention has advantages as follows:
1. The cylinder 2 of the shock absorption structure is slidably disposed in the cavity 130 of the body 1, the air chamber 136 is defined in the cavity 130 of the body 1, the air chamber 136 accommodates the elastic unit 5, and when the impact element 4 hits the air chamber 136 backward, it drives the cylinder 2 to move in the cavity 130, and the elastic unit 5 and the air chamber 136 press simultaneously so as to produce the double shock absorption and to reduce the reaction force toward the user's hands, thus operating the pneumatic tool 100 easily and protecting the user's wrists.
2. The air chamber 136 is defined in the cavity 130 of the body 1 of the shock absorption structure, and the air chamber 136 accommodates the elastic unit 5 and mates with the elastic unit 5 so as to press simultaneously and to produce the double shock absorption, hence the elastic unit 5 does not have elasticity fatigue and is not replaced often, after being used repeatedly.
While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.
Number | Date | Country | Kind |
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105209064 | Jun 2016 | TW | national |