Patent Description:
A conventional diesel engine comprises multiple fuel injectors to provide oil and gas, so that the conventional diesel engine can provide power output after combustion operation. However, the fuel injectors are prone to accumulation or blockage due to impurities or oil collision after a long time use, and this will affect the atomization effect of oil and gas. At this time, the fuel injectors are needed to be taken out from the conventional diesel engine for cleaning or replacement. Since the fuel injectors are tightly fitted on a cylinder of the conventional diesel engine, and the fuel injectors cannot be easily removed manually. With reference to <FIG>, a conventional pneumatic extraction device <NUM> can be used to remove the fuel injectors from the conventional diesel engine. The conventional pneumatic extraction device <NUM> has a vibrator <NUM>, an air delivery pipe <NUM>, and a switch <NUM>. A bottom of the vibrator <NUM> is connected to one of the fuel injectors of the conventional diesel engine, the air delivery pipe <NUM> is connected to the vibrator <NUM> to transmit compressed air into the vibrator <NUM>, and the switch <NUM> is disposed on the air delivery pipe <NUM> to control the transmission of the compressed air.

When the conventional pneumatic extraction device <NUM> is in use, the vibrator <NUM> is securely connected to one of the fuel injectors, and the switch <NUM> is open to enable the compressed air to flow into the vibrator <NUM> via the air delivery pipe <NUM>. Then the corresponding fuel injector can be gradually removed from the cylinder after the vibration of the vibrator <NUM>. Although the corresponding fuel injector can be removed from the cylinder by the conventional pneumatic extraction device <NUM>, the user will not hold the vibrator <NUM> during the vibrating process of the conventional pneumatic extraction device <NUM> to avoid being affected by the vibration of the vibrator <NUM> since the corresponding fuel injector is only connected to the bottom of the vibrator <NUM>. Therefore, the user needs to observe the movement of the corresponding fuel injector relative to the cylinder during use to avoid safety concerns caused by the corresponding fuel injector flying outward together with the vibrator <NUM> when the corresponding fuel injector is separated from the cylinder. Generally, when the corresponding fuel injector is about to separate away from the cylinder, the switch <NUM> is closed to stop the vibrator <NUM> from vibrating, and then the vibrator <NUM> is separated from the corresponding fuel injector. After the vibrator <NUM> is separated from the corresponding fuel injector, the corresponding fuel injector is manually pulled out from the cylinder, so as to avoid the random flying of the corresponding fuel injector along with the vibrator <NUM>.

Although the conventional pneumatic extraction device <NUM> can be used to pull the fuel injectors from the cylinder, the user needs to remove the fuel injector from the cylinder by two-stage operation, and this is relatively inconvenient and time-consuming. Furthermore, the user needs to pay attention to the movement of the fuel injector during the operation, and industrial safety hazard will still occur when the user does not pay attention. Therefore, the conventional pneumatic extraction device <NUM> really has to be improved.

In addition, another conventional pneumatic extraction device is also disclosed in <CIT>. In <CIT>, a multi-stroke powered safety hammer system has been provided and includes a hammer having a body, a cylinder within the body, and a piston carried in the cylinder for reciprocal movement therein. The system includes a quick-connect coupling mount on the hammer, the mount having an inner barrel bounding a hollow interior, an outer sleeve for sliding movement over the inner barrel, and an engagement assembly defined by the inner barrel and the outer sleeve for locking an attachment in the interior. The system includes one of many attachments with an engagement portion; when the engagement portion is applied to the quick-connect coupling mount and the hammer is operated, the piston reciprocates to impact the engagement portion. The attachments guide fasteners, remove fasteners, and process materials.

To overcome the shortcomings, the present invention tends to provide a pneumatic extraction device, to mitigate or obviate the aforementioned problems.

The main objective of the present invention is to provide a pneumatic extraction device that can be held easily, can reduce operating time, and can improve safety.

The pneumatic extraction device in accordance with the present invention has a holding group, an air intake group, and a vibration group. The holding group has a handle and an outer shell. The handle has at least one connecting arm transversally formed on and protruded from an external surface of the handle. The outer shell is connected to the at least one connecting arm opposite to the handle such that the outer shell and the handle are spaced apart from each other at an interval by the at least one connecting arm. The air intake group is connected to the holding group and has a connecting sleeve connected to the handle. The vibration group is connected to the holding group and the air intake group and has a main shaft and a vibrating cylinder. The main shaft is connected to the connecting sleeve and is opposite to the handle, extends into the outer shell, and has a fixing head disposed on a bottom end of the main shaft. The vibrating cylinder is slidably mounted around the main shaft, is mounted in the outer shell, and has an outer external surface non-contacted with an internal surface of the outer shell.

Other objects, advantages and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

With reference to <FIG>, a pneumatic extraction device in accordance with the present invention has a holding group <NUM>, an air intake group <NUM>, and a vibration group <NUM>.

The holding group <NUM> has a handle <NUM> and an outer shell <NUM>. The handle <NUM> has an air inlet <NUM>, a mounting recess <NUM>, an air outlet <NUM>, and at least one connecting arm <NUM>. The air inlet <NUM> is longitudinally formed in the handle <NUM> from a top of the handle <NUM>. The mounting recess <NUM> is transversally formed in a middle portion of the handle <NUM> and communicates with the air inlet <NUM>. The air outlet <NUM> is formed in a bottom of the handle <NUM> and communicates with the mounting recess <NUM>. The at least one connecting arm <NUM> is transversally formed on and protrudes from an external surface of the handle <NUM> adjacent to the bottom of the handle <NUM>. The outer shell <NUM> is connected to an end of the at least one connecting arm <NUM> opposite to the handle <NUM> such that the outer shell <NUM> and the handle <NUM> are spaced apart from each other. Preferably, the handle <NUM>, the at least one connecting arm <NUM>, and the outer shell <NUM> are formed as a single piece. The outer shell <NUM> is a hollow casing and has a mounting chamber <NUM>, an upper opening <NUM>, and a lower opening <NUM>. The mounting chamber <NUM> is formed in the outer shell <NUM>. The upper opening <NUM> and the lower opening <NUM> are respectively formed on a top and a bottom of the outer shell <NUM> and both communicate with the mounting chamber <NUM>.

The air intake group <NUM> is connected to the holding group <NUM> and has a valve base <NUM>, a trigger <NUM>, a connecting head <NUM>, and a connecting sleeve <NUM>. The valve base <NUM> is mounted in the mounting recess <NUM> of the handle <NUM> to enable the air inlet <NUM> to selectively communicate with the air outlet <NUM>. The trigger <NUM> is pressingly connected to the valve base <NUM> on the external surface of the handle <NUM>. The air inlet <NUM> communicates with the air outlet <NUM> via the mounting recess <NUM> when the trigger <NUM> is pressed by a user. Preferably, the trigger <NUM> is disposed on the external surface of the handle <NUM> that faces to the outer shell <NUM> and is disposed above the at least one connecting arm <NUM>. In addition, the valve base <NUM> and the trigger <NUM> are conventional and the features and the structures of the valve base <NUM> and the trigger <NUM> are not to be described in detail. The connecting head <NUM> is connected to the bottom of the handle <NUM> and communicates with the air outlet <NUM>. The connecting sleeve <NUM> is connected to the connecting head <NUM> and has a vent pipe <NUM> and two mounting rings <NUM>, <NUM>. The two mounting rings <NUM>, <NUM> are respectively disposed on two ends of the vent pipe <NUM>, and one of the two mounting rings <NUM>, <NUM> is mounted around the connecting head <NUM> and communicates with the connecting head <NUM>. Preferably, the two mounting rings <NUM>, <NUM> are respectively a first mounting ring <NUM> and a second mounting ring <NUM>. The first mounting ring <NUM> is mounted around the connecting head <NUM>.

With reference to <FIG>, the vibration group <NUM> is connected to the holding group <NUM> and the air intake group <NUM> and has a main shaft <NUM> and a vibrating cylinder <NUM>. The main shaft <NUM> is connected to one of the two mounting rings <NUM>, <NUM> of the connecting sleeve <NUM> that is opposite to the connecting head <NUM>. Preferably, the second mounting ring <NUM> of the connecting sleeve <NUM> is mounted around the main shaft <NUM>. In addition, the connecting sleeve <NUM> has an anti-leak washer <NUM> disposed in a top side and a bottom side of each one of the two mounting rings <NUM>, <NUM>. The main shaft <NUM> has a top end, a bottom end, a fixing head <NUM>, and an air passage <NUM>. The top end of the main shaft <NUM> extends into the mounting chamber <NUM> of the outer shell <NUM> via the lower opening <NUM>. The fixing head <NUM> is disposed on the bottom end of the main shaft <NUM> and can be connected to a fuel injector of a diesel engine. The air passage <NUM> is axially formed in the main shaft <NUM> from the top end of the main shaft <NUM> and communicates with the second mounting ring <NUM>.

The vibrating cylinder <NUM> is slidably mounted on the main shaft <NUM>, is mounted in the mounting chamber <NUM> of the outer shell <NUM> and has an outer external surface non-contacted with an internal surface of the outer shell <NUM> such that the vibrating cylinder <NUM> is spaced apart from the outer shell <NUM>. When the vibrating cylinder <NUM> is moved relative to the main shaft <NUM>, the vibrating cylinder <NUM> will not rub against the outer shell <NUM>. The vibrating cylinder <NUM> has an outer jacket <NUM> and a ventilating seat <NUM>. The outer jacket <NUM> is slidably mounted around the main shaft <NUM> and has a bottom mount <NUM>, a top cover <NUM>, and an air chamber <NUM>. The bottom mount <NUM> is disposed on a bottom of the outer jacket <NUM>, is slidably mounted around the main shaft <NUM>, and is disposed above the second mounting ring <NUM>. The top cover <NUM> is disposed on a top of the outer jacket <NUM>. The air chamber <NUM> is formed in the outer jacket <NUM> between the bottom mount <NUM> and the top cover <NUM>. The ventilating seat <NUM> is mounted securely on the top end of the main shaft <NUM> and is disposed in the air chamber <NUM> between the bottom mount <NUM> and the top cover <NUM>. The ventilating seat <NUM> allows the compressed air in the air passage <NUM> of the main shaft <NUM> to flow between the ventilating seat <NUM> and the top cover <NUM> and between the ventilating seat <NUM> and the bottom mount <NUM>, so that the outer jacket <NUM> can move relative to the main shaft <NUM> and the ventilating seat <NUM> in the mounting chamber <NUM> of the outer shell <NUM>, thereby providing a vibrating force for the main shaft <NUM>.

Furthermore, with reference to <FIG>, <FIG>, and <FIG>, the ventilating seat <NUM> has multiple lower through holes <NUM>, multiple upper through holes <NUM>, multiple toggle levers <NUM>, and a communicating hole <NUM>. The lower through holes <NUM> are formed through a bottom of the ventilating seat <NUM> at spaced intervals and surrounding the air passage <NUM> of the main shaft <NUM>. The upper through holes <NUM> are formed through a top of the ventilating seat <NUM> at spaced intervals, respectively align with the lower through holes <NUM>, and communicate with the air chamber <NUM> of the outer jacket <NUM>. The toggle levers <NUM> are movably disposed in the ventilating seat <NUM>, and each one of the toggle levers <NUM> is mounted in one of the lower through holes <NUM> and a corresponding one of the upper through holes <NUM>. Each toggle lever <NUM> has at least one washer <NUM> mounted around the toggle lever <NUM> and selectively shielding the corresponding lower through hole <NUM> and the corresponding upper through hole <NUM>. Preferably, the ventilating seat <NUM> has three said lower through holes <NUM>, three said upper through holes <NUM>, and three said toggle levers <NUM>. The communicating hole <NUM> is formed through a center of the bottom of the ventilating seat <NUM> and communicates with the air passage <NUM> of the main shaft <NUM>.

With reference to <FIG>, when the pneumatic extraction device of the present invention is in use, an air compressor is connected to the air inlet <NUM> of the handle <NUM> and a fuel injection of a diesel engine is securely connected to the fixing head <NUM>. When a user holds the handle <NUM> and presses the trigger <NUM>, compressed air in the air compressor flows into the air passage <NUM> of the main shaft <NUM> via the air inlet <NUM>, the mounting recess <NUM>, the air outlet <NUM>, the first mounting ring <NUM>, the vent pipe <NUM>, and the second mounting ring <NUM>. Then the compressed air in the air passage <NUM> of the main shaft <NUM> flows into the ventilating seat <NUM> via the communicating hole <NUM>. At this time, the washer <NUM> of each toggle lever <NUM> shields the corresponding lower through hole <NUM>, and the compressed air flows between the ventilating seat <NUM> and the top cover <NUM> of the outer jacket <NUM> via the upper through holes <NUM>. With reference to <FIG>, the outer jacket <NUM> is moved upwardly relative to the outer shell <NUM> along the main shaft <NUM> by the compressed air, and the washer <NUM> of each toggle lever <NUM> shields the corresponding upper through hole <NUM> by the movement of the toggle lever <NUM>. With reference to <FIG>, the compressed air in the ventilating seat <NUM> flows between the ventilating seat <NUM> and the bottom mount <NUM> of the outer jacket <NUM>. Then, with reference to <FIG>, the outer jacket <NUM> is moved downwardly relative to the outer shell <NUM> along the main shaft <NUM> by the compressed air until the top cover <NUM> pushes the toggle levers <NUM> to enable the washer <NUM> of each toggle lever <NUM> to shield the corresponding lower through hole <NUM>.

By means of the washer <NUM> of each toggle lever <NUM> shielding the corresponding lower through hole <NUM> or the corresponding upper through hole <NUM>, the outer jacket <NUM> is repeatedly slid up and down relative to the main shaft <NUM>, and the outer jacket <NUM> moved relatively to the main shaft <NUM> can provide a vibration force to the main shaft <NUM> in the process of sliding up and down, and the vibration force is transmitted to the fuel injector through the fixing head <NUM>, so that the fuel injector can be gradually moved relative to the cylinder of the diesel engine until the fuel injector is separated from the cylinder, and the user can release the trigger <NUM> to complete the removal of the fuel injector.

According to the above mentioned features and structural relationships of the pneumatic extraction device of the present invention, the user only needs to connect the main shaft <NUM> with the fuel injector, holds the handle <NUM> and presses the trigger <NUM>, and the vibration force of the vibration group <NUM> can be used to separate the fuel injector from the cylinder, and this is convenient in use and easy to operate. In addition, the moving direction of the vibration group <NUM> can be maintained by holding the handle <NUM> during use, and this can avoid the situation of the fuel injector separated from the cylinder and flying outwardly, effectively improving the safety of use. Furthermore, when the fuel injector is separated from the cylinder, the injector can be stabilized through the handle <NUM>, the at least one connecting arm <NUM>, and the outer shell <NUM>. Therefore, the pneumatic extraction device of the present invention can directly pull out the fuel injector without manual operation, which effectively reduces the time required for pulling out the fuel injector.

Claim 1:
A pneumatic extraction device, characterized in that the pneumatic extraction device comprises:
a holding group (<NUM>) having
a handle (<NUM>) having at least one connecting arm (<NUM>) transversally formed on and protruded from an external surface of the handle (<NUM>); and
an outer shell (<NUM>) connected to an end of the at least one connecting arm (<NUM>) opposite to the handle (<NUM>) such that the outer shell (<NUM>) and the handle (<NUM>) are spaced apart from each other at an interval by the at least one connecting arm (<NUM>);
an air intake group (<NUM>) connected to the holding group (<NUM>) and having a connecting sleeve (<NUM>) connected to the handle (<NUM>); and
a vibration group (<NUM>) connected to the holding group (<NUM>) and the air intake group (<NUM>) and having
a main shaft (<NUM>) connected to the connecting sleeve (<NUM>) and being opposite to the handle (<NUM>), extended into the outer shell (<NUM>), and having a fixing head (<NUM>) disposed on a bottom end of the main shaft (<NUM>); and
a vibrating cylinder (<NUM>) slidably mounted around the main shaft (<NUM>), mounted in the outer shell (<NUM>), and having an outer external surface non-contacted with an internal surface of the outer shell (<NUM>).