GB2433714A

GB2433714A - Pneumatic nail gun

Info

Publication number: GB2433714A
Application number: GB0625215A
Authority: GB
Inventors: Mu-Yu Chen
Original assignee: Aplus Pneumatic Corp
Current assignee: Aplus Pneumatic Corp
Priority date: 2005-12-27
Filing date: 2006-12-19
Publication date: 2007-07-04
Anticipated expiration: 2026-12-19
Also published as: TWI296227B; GB0625215D0; GB2433714B; TW200724319A

Abstract

A pneumatic nail gun comprises a body 10 being a cylinder 11 and a handle 12 extended from the cylinder, a firing pin 112 positioned in the cylinder, a trigger 15, a magazine 20 connected to the body, a connector 30 and a firing chamber 40. The trigger is operable on the body for actuating the firing pin. The connector includes a first section connected to the cylinder for receiving the firing pin and a second section connected to the magazine for receiving nails. The firing chamber is attached to the second section of the connector for receiving the nails. Preferably a metal lining 111, supported by a ring 114, is positioned between the cylinder and firing pin and a screen 142 for venting exhaust is installed on a cover 14 on the cylinder. Advantageously the cylinder and handle are formed together and the lining is positioned in the cylinder by the cover thus eliminating the need for perfectly matched components.

Description

PNEUIvIATIC NAIL GUN

3 BACKGROUND OF INVENTION

4 1. FIELD OF INVENTION

The present invention relates to a pneumatic nail gun and, more 6 particularly, to a low-cost pneumatic nail gun.

8 2. RELATED PRIOR ART

9 Shown in Fig. 8 is a conventional pneumatic nail gun 90 including a handle 91, a magazine 92 and a cylinder 93. A rear end of the handle 91 11 is connected to a rear end of the magazine 92. A front end of the handle 12 91 is connected to an upper end of the cylinder 93. A front end of the 13 magazine 92 is connected to a firing chamber 935 formed at a lower end 14 of the cylinder 93. A firing pin 933 is secured to a piston 932 positioned in a space 931 defined in the cylinder 93. A cover 934 is connected to 16 the upper end of the cylinder 93, thus retaining the piston 932 and the 17 firing pin 933 in the space 931. A holding device 94 is positioned in the 18 firing chamber 935. The holding device 94 includes a first ring 940 19 attached to the firing chamber 935 by threading, three claws 941 and a second ring 942 attached to the first ring 940 by threading for restraining 21 the claws 941.

22 The handle 91 is made of plastics so that it is light. The cylinder 93, 23 the piston 932 and the firing pin 933 are made of metal so that they are 24 strong. The upper end of the cylinder 93 is fit in an annular portion formed at the front end of the handle 91. To this end, the size of the 26 cylinder 93 and the size of the annular portion of the handle 91 must be I perfectly matched, and this is however difficult and therefore expensive.

2 The firing chamber 935 is part of the cylinder 93 so that the overall 3 profile of the cylinder 93 is complicated. Therefore, the cylinder 93 has 4 to be machined in various machines before it is finished. This machining requires a lot of labor and results in a high cost.

6 After some time of use under heavy load, the cylinder 93 could easily 7 be damaged. When this happens, the entire pneumatic nail gun 90 will 8 have to be disposed of since the cylinder 93 is fit in the annular portion of 9 the handle 91 and they cannot be detached from each other.

The present invention is therefore intended to obviate or at least 11 alleviate the problems encountered in prior art.

13 SUMMARY OF INVENTION

14 According to the present invention, a pneumatic nail gun includes a body, a firing pin, a trigger, a magazine, a connector and a firing chamber.

16 The body includes a cylinder and a handle extended from the cylinder.

17 The firing pin is positioned in the cylinder. The trigger is operable on 18 the body for actuating the firing pin. The magazine is connected to the 19 body. The connector includes a first section connected to the cylinder for receiving the firing pin and a second section connected to the 21 magazine for receiving nails. The firing chamber is attached to the 22 second section of the connector for receiving the nails.

23 An advantage of the pneumatic nail gun of the present invention is 24 that it is manufactured at a high yield since the cylinder and the handle are formed together, and the lining is positioned in the cylinder by the 26 cover without requiring extreme precision in size.

I

Another advantage of the pneumatic nail gun of the present invention 2 is that it is manufactured at a high speed since the connector and the 3 firing chamber are separately made and easily bonded to the body.

4 Another advantage of the pneumatic nail gun of the present invention is that it is used at a low running cost since oniy the firing chamber or the 6 connector has to be replaced with a new one when it is broken without 7 having to replace the entire nail gun with a new one.

8 Other advantages and features of the present invention will become 9 apparent from the following description referring to the drawings.

ii BRIEF DESCPJPT1ON OF DRAWINGS 12 The present invention will be described through detailed illustration 13 of the preferred embodiment referring to the drawings.

14 Fig. I is a perspective view of a pneumatic nail gun according to the is preferred embodiment of the present invention.

16 Fig. 2 is an exploded view of the pneumatic nail gun shown in Fig. 1.

17 Fig. 3 is a cross-sectional view of the pneumatic nail gun taken along 18 aline3-3inFig.1.

19 Fig. 4 is a cross-sectional view of the pneumatic nail gun taken along aline4-4inFig. 3.

21 Fig. 5 is a cross-sectional view of the pneumatic nail gun taken along 22 aline5-5inFig.4.

23 Fig. 6 is a cross-sectional view of the pneumatic nail gun in another 24 position than shown in Fig. 5.

Fig. 7 is a cross-sectional view of the pneumatic nail gun taken along 26 aline7-7inFig.6.

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Fig. 8 is an exploded iew of a conventional pneumatic nail gun.

3 DETAILED DESCRIITION OF PREFERRED EMBODIMENT 4 Referring to Fig. 1, there is shown a pneumatic nail gun according to the preferred embodiment of the present invention. The pneumatic nail 6 gun includes a body 10, a magazine 20, a connector 30 and a firing 7 chamber 40.

8 Referring to Figs. 2 through 4, the body 10 is made of plastics and 9 includes a cylinder 11, a handle 12 transversely extended from the cylinder 11, a connective portion 13 longitudinally extended from a lower 11 end of the cylinder 11 and a leg 16 transversely extended from a rear end 12 of the handle 12. A trigger 15 is arranged between the cylinder 11 and 13 thehandlel2.

14 A ring 114 is positioned in the cylinder 11. Also positioned in the cylinder 11 is a lining 111 made of metal. The lining 111 is supported 16 on the ring 114. A firing pin 112 is connected to a piston 113 positioned 17 in the lining 111. By fasteners 141, a cover 14 is installed on the 18 cylinder 11 for keeping the lining 111, the firing pin 112 and the piston 19 113 in the cylinder 11. Installed on the cover 14 is a screen 142 for venting exhaust.

21 The magazine 20 is formed with an outlet portion 21 and an intake 22 portion 22 opposite to the outlet portion 21. Two valves 221 are 23 positioned in the intake portion 22. The valves 221 are operable for 24 adjusting a rate at which pressurized air is sent into the magazine 20.

The intake portion 22 is secured to a lower end of the leg 16 by fasteners 26 222. An elastic element 231 includes an end secured to the outlet

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i portion 21 by a fastener and an opposite end for keeping a cover 23 on the 2 magazine 20. The outlet portion 21 defines a T-shaped groove 211 3 through which nails are transmitted. Attached to the outlet portion 21 is 4 a transparent cover 212 for covering the T-shaped groove 211 so that the nails in the T-shaped groove 211 can be observed from the exterior 6 through the transparent cover 212.

7 The connector 30 is arranged between the connective portion 13 of 8 the body 10 and the outlet portion 21 of the magazine 20. The 9 connector 30 includes a first section 31 and a second section 32. The first section 31 longitudinally defines a passageway 311 through which 11 the firing pin 112 is inserted. The second section 32 transversely defines 12 a T-shaped opening 321 through which the nails are transmitted. By 13 fasteners 312, the first section 31 of the connector 30 is secured to the 14 connective portion 13 of the body 10. By fasteners 322, the second section 32 of the connector 30 is secured to the outlet portion 21 of the 16 magazine 20. Thus, the body 10, the magazine 20 and the connector 30 17 are firmly connected to one another.

18 The firing chamber 40 is secured to the second section 32 of the 19 connector 30 by fasteners 401. The firing chamber 40 includes a space 402 defined therein, a wall 403 formed thereon and a tube 404 21 transversely extended from the wall 403. A passageway 406 defined in 22 the wall 403 is in communication with a passageway 405 defined in the 23 tube 404.

24 A holding device includes a first ring 41 located in the firing chamber 40, a second ring 412 located outside the firing chamber 40 and claws 411 26 each with an first section in contact with the first ring 41 and a second I section restrained by the second ring 412. The second ring 412 is an 2 elastic ring for biasing the claws 411.

3 A door 42 is pivotally connected to the wall 403 by a pin 421.

4 Installed on the door 42 is a locking device 422 for locking the door 42 to the second section 32 of the connector 30, The locking device 422 6 includes two balls and a spring compressed between the balls. Thus, the 7 holding device can be put into and taken from the firing chamber 40.

8 A control device 43 is positioned in the passageway 405. The 9 control device 43 includes a pusher 431 located in the space 402, a valve 432 located in the passageway 405, a fastener 433 for connecting the 11 valve 432 to the pusher 431, a spring 435 for biasing the valve 432 and 12 the pusher 431 and a cover 434 attached to the tube 404 for retaining the 13 spring 435 and the valve 432 within the passageway 405. The pusher 14 431 is located near the T-shaped opening 321.

The passageway 406 is in communication with the cylinder 11 16 through a pipe 44. The pressurized air is transmitted into the 17 passageway 405 for pushing the valve 432. The valve 432 drives the 18 pusher 431 through the fastener 433. The pusher 431 pushes the nails.

19 Referring to Figs. 4 and 5, the pressurized air goes into the magazine 20 and drives the nails counterclockwise for example. The nails move 21 along the internal side of the magazine 20 and advance into the T-groove 22 211 of the outlet portion 21 of the magazine 20. The trigger 15 is not 23 operated so that the pusher 431 shuts the T-shaped opening 321 and stops 24 the nails.

Referring to Figs. 6 and 7, the trigger 15 is operated. The 26 pressurized air goes into the passageway 405 from the cylinder 11 I through the pipe 44 and drives the valve 432 and therefore the pusher 431, 2 against the spring 435. The pusher 431 opens the T-shaped opening 321 3 of the second section 32 of the connector 30. A leading one of the nails 4 goes into the firing chamber 40 and held by the holding device. Finally, the firing pin 112 hits the leading nail from the holding device.

6 The pneumatic nail gun of the present invention exhibits several 7 advantages. Firstly, it is manufactured at a high yield since the cylinder 8 and the handle are formed together, and the lining is positioned in the 9 cylinder by the cover without the need of extreme precision in size.

Secondly, it is manufactured at a high speed since the connector and 11 the firing chamber are separately made and easily bonded to the body.

12 Thirdly, it is used at a low running cost since only the firing chamber 13 or the connector has to be replaced with a new one when it is broken 14 without having to replace the entire nail gun with a new one.

The present invention has been described through the description of 16 the preferred embodiment. Those skilled in the art can derive variations 17 from the preferred embodiment without departing from the scope of the 18 present invention. Therefore, the preferred embodiment shall not limit 19 the scope of the present invention defined in the claims.

Claims

i CLAFMS 2 1. A pneumatic nail gun comprising: 3 a body (10) comprising

a cylinder (11) and a handle (12) extended 4 from the cylinder (11); a firing pin (112) positioned in the cylinder; 6 a trigger (15) operable on the for actuating the firing pin; 7 a magazine (20) connected to the body; 8 a connector (30) comprising a first section (31) connected to the 9 cylinder for receiving the firing pin and a second section (32) connected to the magazine for receiving nails; and 11 a firing chamber (40) attached to the second section of the connector 12 for receiving the nails.

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2. A pneumatic nail gun according to claim 1 wherein the cylinder 14 comprises a connective portion (13) formed at a lower end for connection to the first section of the connector.

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3. A pneumatic nail gun according to claim 1 wherein the magazine 17 comprises an outlet portion (21) formed thereon and connected to the 18 second section of the connector.

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4. A pneumatic nail gun according to claim 1 comprising a cover (14) for covering the cylinder.

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5. A pneumatic nail gun according to claim 4 comprising a screen (142) 22 installed on the cover for venting exhaust.

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6. A pneumatic nail gun according to claim I comprising a lining (111) 24 positioned between the cylinder and the firing pin.

7. A pneumatic nail gun according to claim 6 comprising a piston (113) 26 connected to the firing pin within the lining.

1 8. A pneumatic nail gun according to claim 6 comprising a ring (114) for 2 supporting the lining within the cylinder.

3 9. A pneumatic nail gun according to claim 3 wherein the outlet portion 4 of the magazine defines a groove (211) for guiding the nails.

10. A pneumatic nail gun according to claim 9 comprising a transparent 6 cover (212) for covering the groove so that the nails can be observed 7 from the exterior through the transparent cover.

8 11. A pneumatic nail gun according to claim 9 wherein the connector 9 comprises an opening (321) in the second section for receiving the nails from the groove of the outlet portion of the magazine.

11 12. A pneumatic nail gun according to claim 1 wherein the body 12 comprises a leg (16) extended from the handle and connected to the 13 magazine.

14 13. A pneumatic nail gun according to claim 1 wherein the magazine comprises an intake portion (22) and two valves (221) operable in the 16 intake portion for adjusting a rate at which pressurized air goes into 17 the magazine.

18 14. A pneumatic nail gun according to claim 1 comprising a cover (23) 19 for covering the magazine.

15. A pneumatic nail gun according to claim 14 comprising an elastic 21 element (231) connected to the magazine for restraining the cover.

22 16. A pneumatic nail gun according to claim 1 wherein the firing chamber 23 comprises a wall (403) formed thereon and connected to the second 24 section of the connector.

17. A pneumatic nail gun according to claim 16 wherein the firing 26 chamber comprises a door (42) connected to the wall.

1 18. A pneumatic nail gun according to claim 17 wherein the firing 2 chamber comprises a locking device (422) for locking the door to the 3 second section of the connector.

4 19. A pneumatic nail gun according to claim I comprising a holding device for clipping a leading one of the nails.

6 20. A pneumatic nail gun according to claim I comprising a pusher (431) 7 for pushing the leading nail to the holding device.