TW523570B - Pneumatic hand tool exhaust muffler having inner and outer tubes - Google Patents

Abstract

A muffler is provided for use in a pneumatic hand tool having a handle with an exhaust passage. The muffler includes an inner tube, an outer tube, an upper plate, and an end cap. The inner tube is located within the outer tube, with one or more openings being provided in each. The upper plate is located near the inner tube and is provided to close off the exhaust passage so that a majority of the exhaust air is directed into the inner tube during use. The end cap attaches to the handle for closing off the exhaust passage, but for one or more exit openings. During use, exhaust air enters the inner tube, flows out its penguins, flows out the outer tube openings, and flows out the exit opening in the end cap. The tortuous path slows the exhaust air and assists in dampening exhaust noise.

Description

523570 A7 V. Description of the invention (Examination of the printed application by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs. This application is a part of US Application No. 09 / 431,294 filed on October 29, 1999. No. 09 / 316,451 of US Application No. 09 / 316,451 filed on May 21, 1999, and No. 09 / 316,451 of US Application No. 09 / 316,451 filed on May 19, 1998 Continuation of US Patent No. 5,909.016, and US Application No. 5,909,016 is a continuation of US Patent No. 5,952,623 filed on January 13, 1998, and this case claims 35 USC §120 The invention is related to a sound improving device for silencing and filtering air, and in particular, for exhausting and filtering exhaust gas produced by hand tools, equipment, and machines. Hand tools are usually industrial and domestic industrial tools. There are different types of air-moving hand tools on the market, including hammers, drills, wrenches, grinders, sanders, etc. Known hand tools basically include have A handle of a hollow inner chamber. The chamber includes an air inlet channel and an exhaust gas channel. Each channel extends between a motor and an opening on the bottom surface of the handle. This portion of the air inlet channel near its respective handle opening. Includes suitable for connecting a standard air connection (please read the precautions on the back before filling this page) —I ---- Order --------- This paper size applies to China National Standard (CNS) A4 specifications ( 210 X 297 public love) 523570 A7

V. Description of the invention (% σσ special components. The connector communicates with a source of pressurized air. The exhaust gas channel is open to the atmosphere. When the exhaust gas is discharged from the hand tool, a large amount of noise and particulate dust will be generated, potentially causing operation Hearing and respiratory damage to people and nearby people. Although staff can use earplugs, they are usually unavailable for several reasons-they are basically inconvenient to use. Therefore, different attempts have been proposed by hand tool manufacturers to Reduce the amount of noise and particles generated by hand tools. These attempts include designing quieter and cleaner motors, and hand tool components that suppress noise and waste before discharging from the hand tools. For example, US Patent No. 5'418 ' No. 339 discloses a pneumatic hand tool, the exhaust port of which is filled with a non-woven fiber web coated with a cement resin. Such mufflers have some success in muffling, but usually cause back pressure of the motor to make the hand tool The operating rate is reduced. The operating efficiency of the tool is basically based on the operating speed of the motor per minute (rpm) at a certain standard pressure. Combined mufflers and air filters in the form of cylindrical air cans printed by employees of the Intellectual Property Bureau, Ministry of Economic Affairs, have been used in large machines such as cranes and rolling machines. For example, US patent Case No. 4,134,472 discloses a combined muffler and air transition device having an intermediate tubular element provided with a plurality of holes. The tubular element is surrounded by a disposable air filter canister, and the canister has a row of stacked annular rings enclosing the canister. The inner and outer of the filter element are sturdy and strong. The exhaust gas passes through the inner cylinder into the filter and exits the outer cylinder. These devices are basically inaccessible to hand tools. However, since 5

i. Description of the invention (p. Its size is too large and too heavy to be difficult to operate. Therefore, there is currently a need for a noise reduction system that can reduce the volume of sound and solid and fluid pollutants emitted from the exhaust gas before it is discharged to the atmosphere. The ideal device should Can effectively mute and filter exhaust gas without causing back-pressure of time quality. This allows hand tools to be operated without compromising the function of pneumatic tools for long periods of time. The ideal muffler system can also be connected to the hand The tool, and the connection can be maintained even when the tool of the display is vibrating. In addition, it is desirable to have a muffler that can be easily connected to the conventional pneumatic hand tool. The present invention satisfies these and other requirements as described below Abstract of the invention The Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs has printed a muffler for a pneumatic hand tool having a handle provided with an exhaust passage according to the features of the present invention. The muffler includes an inner tube, an outer tube, An upper plate and an end cap. The inner tube is positioned in the outer tube, and one or more holes are provided on the inner and outer tubes. A combination of the inner tube and the outer tube Positioned in the main part of the exhaust gas channel. An outer plate positioned near the proximal end of the inner tube is provided to close the exhaust gas channel so that a large amount of exhaust gas is guided into the inner tube when in use. The end cap is connected to the handle so as to eliminate one or several discharge holes The exhaust gas passage is closed outside. When in use, the exhaust gas enters the inner pipe, flows out of its hole, flows out of the outer pipe hole, and flows out of the discharge hole on the end cap. This curved path slows down the flow rate of the exhaust gas and helps reduce Exhaust noise. There are several embodiments of the present invention. 6 This paper size is applicable to China National Standard (CNS) A4 (210 X 297 mm) 523570

Consumption cooperation by employees of the Intellectual Property Bureau of the Ministry of Economic Affairs, printed by the company. V. Invention Description (The above features and many advantages of the present invention will be made clearer with the detailed description of the drawings, of which: Figure 1 is formed in accordance with the present invention Partial cross-sectional view of the first embodiment of the muffler; Figure 2 is a partial cross-sectional view of the second embodiment of the muffler formed according to the present invention; Figure 3 is the embodiment of Figure 2 Partial cross-sectional side view of the muffler element used in Figure 4; Figure 4 is a perspective view of the outer tube of Figure 2; Figure 5 is a perspective view of the inner tube of Figure 2; Figure 6 is the end cap of Figure 2 Fig. 7 is a partial cross-sectional view of a third embodiment of a muffler formed according to the present invention; Fig. 8 is a side view of the muffler of Fig. 7; Fig. 9 is an outer view of Fig. 7 Perspective view of a tube; Figures 10, 11, 12, 13, 14 and 15 are perspective views of another embodiment of an inner tube formed according to the present invention; Figure 16 is a fourth implementation of a muffler formed according to the present invention Example of a partial cross-sectional view; Figure 17 shows the standing of the outer tube and the second inner tube of Figure 16 Figure · Figure 18 is a partial cross-sectional view of the muffler ~ Lewu embodiment formed according to the present invention; Figure 19 is a perspective view of the outer tube of Figure 18; 7 This paper size applies the Chinese National Standard (CNS ) A4 size (210 X 297 mm) --------------------- ^ --------- ^ (Please read the precautions on the back first Refill this page} 523570 A7 ----- -B7 V. Description of the invention (printed with the Intellectual Property Bureau Employees Consumer Cooperative of the Ministry of Economic Affairs Figure 20 is a perspective view of the inner tube of Figure 18; Figure 21 is another silencer Partial cross-sectional side view of the embodiment of the device; Figures 22'23 and 24 are perspective views of the element of Figure 21; Figures 25 and 26 are perspective views of another muffler. Details of the preferred embodiment The invention is a muffler for quiet exhaust gas from a pneumatic hand tool. The invention is small in size, light in weight, and easy to use. In the selected embodiment, the muffler only needs to be slightly changed according to the needs of the hand tool That is, it is suitable for immediately connecting a conventional pneumatic hand tool. Several embodiments of the present invention will be described below with reference to the drawings. It should be understood that these implementations The examples are merely to illustrate the different features of the present invention, and therefore should not be considered as limiting the scope of the present invention. Referring to FIG. 1, a pneumatic hand tool 10 generally includes a handle 12, an intake passage 14, and an exhaust passage. 16 extends into it and ends in individual orifices on the bottom surface 18 of one of the handles. The holes of the air inlet passage 14 include threads 20 adapted to connect an air supply pipe 22 with a standard air connector 24 or the like. It communicates with a pressurized air supply source (shown). The exhaust gas passage includes a main portion 26. The muffler of the present invention is accommodated by the main portion and is supported by one of several devices depending on the configuration of the hand tool handle. Referring to FIG. 1, the muffler formed according to the present invention includes an inner pipe 30 and an outer pipe 32, the combination of which is positioned in the exhaust passage section. This paper rule is the National Standard for Finance (CNS) A4 (210 X 297).

ih --------- Sale (Please read the precautions on the back before filling this page) ϋ ϋ ϋ n —Order --------- line 523570 A7 Employee Consumer Cooperatives, Intellectual Property Bureau, Ministry of Economic Affairs Print · V. Description of the invention (Yin Nei. The inner tube 30 includes an upper or a proximal end which is open to accommodate exhaust gas from the exhaust channel. The inner tube is preferably formed of a hard material such as hard elastomer metal, fiber, or cloth. A The upper plate 36 helps to guide the exhaust gas to the upper end of the inner tube. Here, the so-called proximal end refers to the direction closer to the exhaust source, and the distal end refers to the direction farther from the exhaust source. The inner tube 30 also includes At least one other hole 38, and preferably several other holes. The additional hole 38 allows exhaust gas to flow out of the inner tube. The outer tube & also includes at least one air flow hole 40. Depending on the pressure configuration of a particular hand tool, 'more or more Fewer holes can be used on the tube to help adjust the amount and speed of conventional exhaust gas. The size of the outer tube 32 is suitable for preparing a passage 42 between itself and the wall surface of the main part. One end cover 44 can be connected to the handle ' To close the exhaust passage. The end cap 44 includes one or more outlet holes 46 which are released to the atmosphere. The exhaust gas enters the proximal end of the inner tube, flows out from at least one hole of the inner tube, and then flows out from at least one air flow hole, passes through the passage between the outer tube and the wall surface of the main part; and flows out from the outlet hole on the end cover. This curved path slows down the exhaust gas and helps to suppress exhaust noise. Referring to the embodiment of Figures 1 and 2, the upper plate 36 is integrally formed with the proximal end of the outer tube 'and rests against the main portion formed in the exhaust gas channel. A shoulder 50. The upper plate 36 includes a central tube 52 aligned with the proximal end of the inner tube. The upper plate 36 completely closes the proximal end of the outer tube. In the configuration of Figs. 1 and 2, the distal end of the inner tube end is closed. In this way, the exhaust gas is forced out of the inner pipe 30 sideways. In the i-th figure, the distal end of the inner pipe 30 is closed with an end cap 44 ---------------- installation ------- -Order --------- line (please read the precautions on the back before filling out this page) 523570 A7 V. Invention Description (7 Printed and closed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs, and the exit hole 46 is positioned Outside the outer tube 32. In Fig. 2, the distal ends of the inner tube 30 and the outer tube 32 are closed by a separate closing cover 54. In the embodiment of Fig. 5, the inner tube 30 has a Uneven straightness, in particular, its shape gradually tapers and becomes smaller toward the distal end of the inner tube. Several spacers 56 are positioned along the inner tube 30, and each of the spacers is directed outward from the outer surface of the inner tube toward the inner surface of the outer tube. Extension. In Figure i, the spacer is a separate element from the inner tube itself. In Figures 3 and 5, the spacer is integrally formed with the inner tube 30. The optional gasket 58 can be placed on the inner and outer tube. The gasket can be made of conventional materials such as main felt, cotton yarn, rubber foam, or synthetic fibers. In the embodiment, the spacer extends completely between the inner tube 30 and the outer tube 32 to force the exhaust gas to the side Advance vertically through each washer 58 rather than between the washer. In the embodiment of Fig. 2, the end cap 44 is connected to a handle to close the exhaust gas passage. The end cap 44 includes a bulbous surface 60 having a plurality of exit holes ,, see also FIG. Referring now to Figure 4, the outer tube = includes one of the longitudinal wings 62 near the distal end of the criminal and the extension element. When the s' Xiao sounder is inserted into the main part of the exhaust passage, the wings are inserted into a corresponding hole formed on the handle. The inserted wings prevent the silencer from turning. Similarly, the extension element contacts the end cap 44 to prevent displacement of the muffler. In the embodiment of Figs. 1 and 2, the muffler receives the exhaust gas from the inner pipe, and forces the empty IL, outward " to flow out from the muffler. The seventh, eighth, sixteenth, and eighteenth embodiments also require exhaust gas to flow inward into the inner pipe and be discharged by a self-muffler. Machine to ‘paper size applies Chinese National Standard (CNS) A4 specification (210 X 297 public love)

---------------- Line Thai (Please read the notes on the back before filling out this page) 523570 A7 V. Description of the invention (printed by the Consumer Cooperative of the Intellectual Property Bureau of the Ministry of Economic Affairs of Yin Min) Referring to Figures 7'8 and 9, it is a third embodiment of a muffler formed in accordance with the present invention, which has an outer tube 32 including two chambers. The first-chamber 70 is positioned at the second chamber 72 Above, while the sturdy blocking plate 74 is positioned in between, see also Figure 9. The end of the outer tube is open and several air holes 40 are provided on the side walls of the two chambers. The air holes are near and far A fan-shaped edge is formed on the outer tube end. The first and second chambers 70 '72 of the outer tube are approximately the same size, but may vary depending on the particular application and the hand tool involved. For example,' the first chamber 70 may be approximately the entire 1/3 of the size and 2/3 of the second chamber 72. A separate second inner tube 76 is prepared and positioned in the outer tube 72. The second inner tube 76 includes an open distal end and at least another 38. Related to This' first and second inner tube 30,76 functions similarly but is positioned in reverse. In Figure 7, the first inner tube 30 and the upper plate 36_ are formed. And close the proximal end of the outer tube first chamber 70. The second inner tube 76 is integrally formed with the lower plate 78 and closes the distal end of the second tube 72 of the outer tube. The exit hole 46 of the end cap 44 is adjacent to the lower plate and the first tube. The open distal positioning of the two inner tubes 76. Alternatively, one end cover 44 can be provided with the function of a lower plate. The muffler embodiment of FIG. 7 is inserted downward into the first inner chamber 30 to the first chamber 7 of the foreign official. Insert the second tube 76 to the first tube 72 of the outer tube upwards; insert the combination into the exhaust gas handle; and connect the end cap to the handle to combine. When in use, the exhaust gas passes to the outer tube 32 and the wall surface of the main part After the passage between them, the exhaust gas flows into the air hole 40 of the second chamber 72, enters the hole of the second inner pipe 76, and starts from the second inner two-chamber body pipe.

^ -------- ^ --------- ^ {Please read the notes on the back before filling out this page) 523570 A7 B7 Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs (? The open distal end of 76 flows out and exits from the outlet hole 46 on the end cap 44. Figures 10-1 5 show different inner tube configurations. Generally speaking, additional holes on the inner tube can be positioned inside On the distal end of the tube, or along the side wall of the inner tube, or on both. The configurations of Figures 10 and 11 include a single hole on the transport end of the inner tube. Figure 10 also includes several on the outside surface The side silencer 80. Figure 11 has several longitudinally long grooves 82. Different other wings can be used to direct the air in a specific way. In the configuration of Figures 12-1 5 the distal end is closed and the hole follows The inner tube is provided on the side wall. Figure 12 includes a longitudinal semi-long groove 84 and lateral narrow holes 86. Figures 13, 14, 15 and 16 include a circular hole 84. Figure 13 also includes a tapered sidewall, Figure 1 The figure additionally includes a washer 58 positioned around its circular hole. Other configurations are possible. Referring to Figures 16 and 17, there is shown a muffler formed in accordance with the present invention The fourth embodiment, wherein the second inner tube 76 is disposed under the outer tube 32. The second inner tube 76 has an open distal end and a closed proximal end. As shown in FIG. 17, the second inner tube 76 is preferably connected to the outer tube. The tube 32 is integrally formed and extends downward from an outer tube lower surface 92. The second inner tube 76 includes one or more holes along its side wall. The open distal end of the second inner tube 76 is adjacent to the exit hole 46 of the end cap. And positioning. Alternatively, a lower plate at the distal end of the inner tube can be used to direct air to the outlet hole 46. In use, the exhaust gas enters the proximal end of the first inner tube 30 and flows out of at least one hole of the first inner tube. At least one airflow hole 40 from the outer tube passes through the passage 42 between the outer tube and the wall surface of the main part and flows into at least one hole of the second inner tube 76 from the opening of the second inner tube. ------------------- Order --------- Line (Please read the precautions on the back before filling out this page) 12 523570 Five Intellectual Property of the Ministry of Economic Affairs Printed by the Bureau's Consumer Cooperative Cooperative · A7 B7, Description of Invention () 10 The distal end flows out and flows out from the discharge hole 46 of the end cover. Several gaskets can be positioned around the second inner tube to place The flow of exhaust gas. As in the previous embodiment, the inner tube can adopt several different sizes and shapes. The second inner tube of Fig. 17 forms a cylindrical fence or rafter. In addition, the first and The two inner tubes are substantially the same size, but this ratio can also be changed depending on the actual application and the hand tool involved. See Figures 18, 19 and 20 for a fifth embodiment of the muffler according to the present invention. This implementation The example is similar to the fourth embodiment, but the first and second inner tubes are integrally formed into a long inner tube 30. A cutting wall 94 is positioned between the first and second inner tubes so that exhaust gas flows through it. . The outer tube 32 includes a bottom hole 96 on its lower surface, see FIG. After the assembly is completed, the inner tube 30 extends through the bottom hole. The cutting wall is coplanar with the outer surface of the outer tube. The size matching of the inner tube and the bottom hole allows the exhaust gas to flow directly from the bottom hole of the outer tube. As mentioned above, using the teachings disclosed herein can make different changes. For example, the outer tube of Fig. 7 can be modified with a 孑 L 'on the cutting wall to match the long inner tube of Fig. 20. With another embodiment, the outer tube of Fig. 17 can be modified by adding a second chamber 72 surrounding the second inner tube. Several other changes exist. An important object of the present invention is to discharge the exhaust gas by forcing it through different turns. In addition, it is important to have enough equipment to filter the exhaust gas and suppress the noise without affecting the function of the hand tool, especially not to produce bad back pressure. Refer to Figures 21-24, which shows another implementation of a muffler. 13 This paper size applies to China National Standard (CNS) A4 (210 X 297 public love) ------------- equipment -------- Order --------- line (please read the notes on the back before filling out this page) Printed by the Consumer Cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 523570 Α7 _ Β7 V. Description of the invention () 11 cases, which is suitable for hand tools with an exhaust gas passage, and the intake air supply officer passes through the passage. The muffler includes an inner pipe 30 arranged around a supply pipe, which is adapted to receive exhaust gas in an exhaust gas passage. A plurality of washers 58 are optionally placed around the inner tube 30. The hand tool in FIG. 22 extends with an end cap 44 having a foot movement volume to support the internal organ 30 and the washer 58. The end cap 44 includes an exit hole 46 on its lower and / or side surfaces. In one embodiment, the end cap 44 is attached to the bottom surface of the hand tool using conventional fixtures. In another embodiment shown in Fig. 21, the size and shape of the 'handle itself can be changed to fit the muffler element, and the end cap 44 can cover only the new elongated handle. In use, the exhaust gas enters the inner tube, flows out from the inner tube hole, flows into the gasket, flows out from the remaining part of the end cover 44 (or handle), and flows out from the outlet hole. 25 and 26 are perspective views of another embodiment of the muffler. In this configuration, the inner tube 30 is similar to the configuration of FIG. 20. A second inner tube is positioned below and connected to the first inner tube. A cutting wall (not shown) is positioned between the two inner tube sections. A plurality of washers 58 are positioned around the second inner tube. In use, the exhaust gas flows into the open proximal end of the first inner tube, flows out from the first inner tube hole, and flows around the cutting wall, flows into the second inner tube, flows out from the distal hole of the second inner tube, and exits from the outlet. The holes 46 flow out. This embodiment of an inner pipe can be used with or without an outer pipe 32. The preferred embodiment of the present invention has been disclosed above. It should be understood that various changes can be made without departing from the scope of the present invention. For example, 14 paper sizes are applicable to Zhongguanxuzhun (CNS) A4 size coffee. –-------- (Please read the precautions on the back before filling this page)-^ ------- Order --------- Xin Qin 523570 A7 V. Description of the invention (512 Concavo-convex holes can be used for baffles and / or cut off walls to reduce sudden pressure fluctuations. For example, many different sizes and shapes And position holes can be used with different components. In addition, the cross section of the inner and outer pipes can be any shape. ------------- Installation ------- Order- -------- Line {Please read the precautions on the back before filling out this page) The consumer cooperation of the Intellectual Property Bureau of the Ministry of Economic Affairs, printed by the company. 15 This paper size applies to China National Standard (CNS) A4 (210 X 297 mm) 523570 A7 B7

V. Description of the invention (P) Reference table for printed component numbers of employees' cooperatives of the Intellectual Property Bureau of the Ministry of Economic Affairs 10 Air-powered hand tools 60 Surface 12 Handle 62 Longitudinal wings 14 Intake passage 64 Extension element 16 Exhaust passage 70 First chamber 18 Bottom surface 72 Second chamber 20 Thread 74 Blocking plate 22 Supply pipe 76 Second inner pipe 24 Connector 78 Lower plate 26 Main part 80 Silencer 30 Inner pipe 82 Groove 32 Outer pipe 84 Groove 36 Upper plate 86 Fine 孑 L 38 88 Round hole 40 air hole 92 lower surface 42 passage 94 cut-off wall 44 end cap 96 bottom hole 46 exit hole 50 shoulder 52 center pipe 54 cover 56 spacer 58 gasket 16 I ----------- -^ ------- Order --------- Line (Please read the precautions on the back before filling this page) This paper size applies to China National Standard (CNS) A4 (210 X 297) %)

Claims (1)

523570 A8 B8 C8-D8__ VI. Please request the outline '~~' --- 帛 _ No. 1G7972 Special Application for Patent Range Amendment Date of this amendment: May 91 1.-A silencer, which is placed in A pneumatic hand tool has a handle-the handle is provided; an exhaust channel, the exhaust channel includes-has a main part of a wall surface, the muffler includes: (a) a An inner tube with an open proximal end and a distal end, the inner tube including at least one hole in addition to its open proximal end; (b) an external officer positioned around the inner tube and including at least one airflow hole; the inner tube The combination of the pipe and the outer pipe is positioned in the main part of the exhaust gas passage; the size of the outer pipe is suitable for placing a passage between itself and the wall surface of the main part; (c) an upper plate, which is close to the The inner tube is positioned at the proximal end; the upper plate closes off the main part of the exhaust gas passage, so that most of the exhaust gas is guided into the proximal end of the inner tube when in use; and (d) an end cap which can be connected to the handle to Closing the exhaust gas passage, and the end cap has an outlet hole; wherein, when in use Exhaust gas enters the proximal end of the inner tube, flows out of at least one hole of the inner tube, and then flows out of at least one air flow hole, through a passage between the outer tube and the wall surface of the main part; and at the end cap The outlet hole on the upper side flows out; thereby, the curved path slows down the exhaust oxygen flow rate and helps to suppress exhaust noise. 2. As for the muffler in the first scope of the patent application, the inner tube of this paper is in accordance with China National Standard (CNS) A4 (210X297 mm) ....... Φ :. (Please read the notes on the back before filling in this page), a ^ 丨 # ·· VI. Apply for a patent fan park with at least one hard Formed from one of elastomer, metal, fiber material and strong cloth. 3. As in the muffler of the scope of patent application, there are several holes in the inner side surface. 4. The muffler, as in item i of Shenqing's patent, in which there are several holes in the side surface of the outer tube. 5. The muffler according to item 1 of the scope of patent application, wherein the main part includes-an upper shoulder portion 'and the upper palate is formed to contact the upper shoulder portion to force exhaust gas into the proximal end of the inner tube during use. 6 · If the scope of patent application is the first! The item's muffler further includes a plurality of washers positioned around the inner tube. 7. If the muffler of item 6 of the patent application, the plurality of washers in the frame are made of a group of materials including wool drum, cotton yarn, rubber, swimming and synthetic materials. 8. The muffler according to item 1 of the scope of patent application, further comprising a plurality of spacers positioned around the inner pipe at intervals, each of the spacers extending outwardly from the outer surface of the inner pipe toward the inner surface of the outer pipe. 9. The muffler according to item 8 of the scope of patent application, which further includes the positioning of the inner tube of a plurality of wrappers between the spacers. 10. As for the muffler of the first patent application scope, wherein the upper plate closes the proximal end of the closed outer tube, and the distal end of the outer tube is closed, and in use, substantially all exhaust gas enters the proximal end of the inner tube, since At least one air hole of the outer tube flows out, passes through the passage between the outer tube and the wall surface of the main part, and then directly exits from the end cover. The paper size is in accordance with Chinese National Standard (CNS) A4. (210X297 Public Love) Application for Patent Scope κ Such as the muffler of patent application No. 10 A gasket positioned around the inner tube. It also includes a number of sounders, and it also includes a number, each spacer is from the outside of the inner tube ... If the silencer of the scope of application for patent No. 10 is a spacer positioned around the inner tube at intervals, each surface faces the outside The inner surface of the tube extends outward. 13. The muffler according to item 12 of the patent application, further comprising a plurality of inner tubes positioned around the spacers. 14. The muffler according to claim 10, wherein at least one air hole of the outer tube includes a plurality of longitudinal fine holes. 15. The muffler according to claim 10, wherein the upper plate is integrally formed at the proximal end of the outer tube. Guarro's patent application, scope 10, where at least one hole in the inner tube is positioned along a side wall of the inner tube. 17. The muffler of claim 10, wherein the distal end of the inner tube is closed. 18. Such as the scope of patent application! The muffler of item further includes a second inner tube positioned under the first inner tube; the second inner tube has an open distal end and a -proximal end; the second inner tube includes, in addition to its open distal end, At least one hole; the exhaust hole of the end cap is positioned adjacent to the open distal end; in use, after the exhaust gas enters the passage between the outer pipe and the wall surface of the main part, the exhaust gas flows into the second inner pipe Out of the at least one hole, it flows out from the open distal end of the second inner tube and flows out from the end cap discharge hole. 523570 A8 Βδ C8 ___D8 ^, patent application scope 19. A muffler is provided in a pneumatic hand tool, the pneumatic hand tool has a handle, the handle is provided with an exhaust channel, the exhaust channel includes a main part, The muffler includes: (a) an inner tube having an open proximal end and a distal end, the inner tube including at least one hole in addition to its open proximal end; (b) a second inner portion positioned under the first inner tube The second inner tube has an open distal end and a proximal end; the second inner tube includes at least one hole in addition to its open distal end; (c) an outer tube having two chambers, the first inner tube is positioned In the first to the second inner tube is positioned in the second chamber; the outer tube includes at least one air flow hole in each toe, and the size of the outer tube is set to be on the wall surface of itself and the main part (D) — the upper plate is positioned close to the proximal end of the inner tube; the upper plate closes the main part of the exhaust gas passage, so that most of the exhaust gas is guided to the proximal end of the first inner tube on the day of use (E) — end cap that can be attached to the handle to close the An air passage, and the end cap has an exhaust hole; wherein when in use, the exhaust gas enters the proximal end of the inner tube, flows out from at least one hole of the inner tube, and reaches from the first chamber of the outer tube to an > airflow The hole flows out through a passage between the outer tube and the wall surface of the main part, flows into at least one air flow hole in the second chamber of the outer tube, and flows into at least one hole in the second inner tube from the second inner tube. The official open distal end flows out, and flows from the exit hole on the end cover. The paper size is suitable for financial standards (CNS) A4 (21GX297) ................... ........ install ------------------ order ------------------ line ・ (please (Please read the precautions on the back before filling this page) Α8 Β8 C8 ------ ^ _ Please refer to the patent document '~ Out; this bends the path to slow down the exhaust gas flow rate and helps to suppress exhaust noise. 20. The muffler according to item 19 of the scope of patent application, wherein the first and second outer tube chambers do not communicate with each other at all. 21. The muffler according to claim 19, wherein the main portion includes an upper shoulder, and the upper plate is formed to contact the upper shoulder. P to force exhaust gas into the proximal end of the inner tube during use. 22. The muffler according to claim 19, wherein the upper plate body is formed at a proximal end of the first inner tube. 23. The muffler according to item 19 of the patent application scope, further comprising a lower plate near the distal end of the second inner tube and adjacent to the opening hole of the end cover; the lower plate closes off the main part of the exhaust gas passage, thereby In use, substantially all exhaust gas must flow through the second inner tube to be discharged from the muffler. 24. The muffler of claim 23, wherein the lower plate is integrally formed at the distal end of the second inner tube. 25. The muffler according to item 19 of the patent application, wherein there are several holes in the side surfaces of the first and second inner tubes. 26. The muffler according to item 19 of the patent application, wherein there are several air holes in the side surfaces of the first and second chambers of the outer tube. 27. The muffler according to claim 19, wherein the first and second chambers of the outer tube are approximately the same size. 28 * A muffler, which is provided in a pneumatic hand tool, which has a handle which is provided with an exhaust gas. The paper size is applicable to Chinese national standard A4 (2I0x297). (Please read the back first (Notes on this page, please fill out this page) Passage, the exhaust passage comprising a main part, the muffler comprising: (a) an inner tube having an open proximal end and a distal end, the inner tube including at least one hole in addition to its open proximal end; (b) -A second inner tube having an open distal end and a proximal end; the second inner tube includes at least one hole in addition to its open distal end; (c) an outer pipe having a lower surface; the first pipe is positioned in the outer pipe; the second inner pipe extends downward from the lower surface of the outer pipe; the outer shell includes at least one air flow hole; It is set so that a passage can be placed between itself and the wall surface of the main section; (d) — an upper plate, which is positioned near the proximal end of the inner pipe; the upper plate closes the main part of the exhaust gas passage, so that most of the exhaust gas is in the Is guided into the proximal end of the inner tube during use; and (e) an end cap which can be connected to the handle to close the exhaust gas passage, and the end cap has an outlet hole; wherein when in use, the exhaust gas enters the proximal end of the inner tube and flows out of at least one hole of the inner tube; Flowing out of at least one air hole of the outer tube, flowing into the at least one hole of the second inner tube through a passageway between the outer tube and the wall surface of the main part, and opening from the second inner tube The distal end flows out and exits from the outlet hole on the end cap, thereby curving the path to slow down the exhaust gas flow rate and help suppress exhaust noise. 29 * If the muffler of item 28 of the scope of patent application, the Chinese paper standard (CNS) A4 (210X297 mm) applies to this paper size 523570 A8 B8 C8 — —— ^ _ 6. Application scope There are several holes on the side surface of the second tube. (Please read the precautions on the back before filling out this page) 30. If the muffler in the scope of patent application No. 28, there are several air holes in the side surface of the outer tube. 31. For the muffler of the scope of patent application No. 28, wherein the main part includes a shoulder, and the upper plate contacts the upper shoulder to force all exhaust gas into the proximal end of the inner tube during use. 32. The silencer of item 28 of the scope of the patent application further includes a plurality of washers positioned around the second inner tube. 33. The muffler according to item 28 of the patent application, wherein the end cap is closed except for the main part located at the open distal end of the second inner tube. 34. The muffler of claim 28, wherein the upper plate is integrally formed at the proximal end of the first inner tube. 35. If the muffler of the scope of patent application No. 28, in use, all exhaust gas must flow out through the outer pipe and enter the second inner pipe 'to be discharged from the muffler. # 36. If the muffler of the scope of patent application No. 28, wherein the proximal end of the second inner tube is connected to the distal end of the outer tube, the second inner tube and the outer tube are not connected with each other, so that all exhaust gas enters The second inner tube flows out through the outer tube. 37. The muffler of claim 28, wherein the second inner tube is integrally formed at a distal end of the outer tube. 38. In the case of the muffler in the scope of patent application No. 28, the outer tube and the second inner tube have substantially the same length. 39. A muffler is provided in a pneumatic hand tool. The paper size is in accordance with the Chinese National Standard (CNS) A4 (21〇χ297 & ^) 523570 A8 B8 C8 ___ D8 6. Application scope of the patent The pneumatic hand tool The tool has a handle provided with an exhaust gas channel, the exhaust gas channel including a main part, the muffler including ... (a) an inner tube having an open proximal end and a distal end, the inner tube except for the open proximal end The outside includes at least one hole; (b) a second inner tube having an open distal end and a proximal end; the second inner tube is positioned under the first inner tube and is fixedly connected to it; a cutting wall is positioned at Between the first and second inner tubes to prevent airflow; the second inner tube includes at least one hole in addition to its open distal end; (c) an outer tube having an entrance and a distal end, the distal end including a bottom The inner tube extends through the outer tube, the first inner tube is positioned inside the outer tube, and the second inner tube extends below; the cut-off wall is located on the bottom hole; the outer tube is removed The bottom hole includes at least one airflow hole; the size of the outer tube is It is determined that a passage can be provided between itself and the wall surface of the main part; (d) — upper plate, which is positioned near the proximal end of the inner tube; the upper plate closes the main part of the exhaust gas passage, so that most of the 4 Exhaust gas is guided into the proximal end of the inner tube during use; ⑹-end cap 'which can be connected to the handle to close the exhaust gas passage, and the end cap has an outlet hole; wherein when in use, the exhaust gas enters the inner tube At the proximal end, outflow from at least one hole of the inner tube and outflow from at least one air hole of the outer tube 'through a passage between the outer tube and the wall surface of the main portion' into at least the second inner tube In one hole, the Z paper size of the second inner tube applies the Chinese National Standard (CNS) A4 specification (210X297 mm) '' ............... -------- Order ........ line · (Please read the precautions on the back before filling this page) 523570 A8 B8 C8 _____ D8, Apply Patented open-end outflow, and outflow from the U-hole on the end cap, thereby curving the path to slow down the exhaust gas flow rate and help to suppress exhaust noise (please read the note on the back first Matters are reproduced on this page). ..., 40. The muffler according to item 39 of the patent application, wherein there are several holes in the first and second pipe side surfaces. 41. The muffler according to claim 39, wherein the side surface of the outer tube has a plurality of air flow holes. 42. The muffler of claim 39, wherein the main portion includes a shoulder and the upper plate contacts the upper shoulder to force all exhaust gas into the proximal end of the inner tube during use. •,-^ 1 丨 43. The muffler according to item 39 of the patent application scope further includes a plurality of washers positioned around the second inner tube. 44. For example, the muffler according to item 39 of the patent, wherein the end cap closes the main part except the open distal end of the second inner tube. 45. The muffler of claim 39, wherein the upper plate is integrally formed at the proximal end of the first inner tube. 46. The muffler according to item 39 of the patent application scope, in which all exhaust gas must flow out through the outer pipe during use, and enter the second internal officer to be discharged from the muffler. 47 · * The muffler of patent application No. 39, wherein the first and second inner tubes have substantially the same length.