1. Field of the Invention
This invention relates to a nailing gun, more particularly to a nailing gun incorporating an improvement relating to a nail pusher.
2. Description of the Related Art
Referring to
The first and second safety plates 401, 402 are secured to each other. A safety member 403 has one end 404 extending in to a hole 406 formed in the first safety plate 401 through a hole 108 of the base plate 101, and another end 405 connected to an actuating plate 407 which in turn is connected to a valve rod 408 that controls a pneumatically operated nail driving mechanism mounted within the barrel 200. A trigger 409 is provided to activate the actuating plate 407.
When no nail shooting operation is performed, the end 405 of the safety member 403 is biased by a spring (not shown) so that the first and second safety plates 401, 402 are pushed by the end 404 of the safety member 403 to protrude outwardly of the base plate 101 and the face plate 102. When a nail shooting operation is performed, the nail shooting nose 100 is pressed against a site to be nailed. As a result, the first and second safety plates 401 and 402 are pushed upward so that the safety member 403 depresses the actuating plate 407. In this situation, the pressing of the trigger 409 will activate the actuating plate 407 and the valve rod 408 so that a nail is driven outward from the nail shooting nose 100.
When the nails in the nail magazine 300 are used up, the nail pusher plate 301 moves to the base plate 101 with a front end 302 thereof protruding into a slot 400 of the first safety plate 401 through an aperture 107 of the base plate 101 so that the first and second safety plates 401, 402 cannot move upward even when the nail shooting nose 100 is pressed against a site to be nailed. As such, the driving mechanism of the nailing gun is prevented from performing idly a nail shooting operation.
Typically, a nail pusher for pushing a nail stick toward a nail shooting nose is loaded with one or more springs which are mounted within a nail magazine. Referring to
However, since the springs 13 are exposed to the nail channel 11 without any accompanying limiting element, the springs 13 are prone to wobble and deformation. In addition, dusts and debris can intrude into the clearances in the springs 13 due to frequent opening of the nail magazine 11, thus adversely affecting the sliding movement of the nail pusher plate 12. Therefore, protection of the springs from contaminating substances is desirable in order to maintain good performance of the springs 13 and the nail pusher 12.
An object of the present invention is to provide a nailing gun with an improved nail magazine which incorporates protection means for protecting a spring of a nail pusher.
According to this invention, a nailing gun comprises: a nail magazine including a magazine base and a magazine cover which are coupled slidably to each other to confine a nail channel, the magazine base having a guide groove which is communicated with the nail channel; a spring unit including a guide tube received movably in the guide groove, and a coiled spring received movably in the guide tube; a nail pusher plate slidably received in the nail channel and attached to the magazine cover, the nail pusher plate having a protrusion extending slidably into the guide tube and connected to the coiled spring so that the nail pusher plate is urged by the coiled spring.
Other features and advantages of the present invention will become apparent in the following detailed description of the preferred embodiment of the invention, with reference to the accompanying drawings, in which:
Referring to
The nail feeding unit 4 according to the present invention includes a nail magazine 40 incorporating a spring unit 5 and a nail pusher 6. The nail magazine 40 is connected to the nail shooting nose portion 3 and includes a magazine base 42 and a magazine cover 43 which cooperatively confine a nail channel 41 (
The spring unit 5 has a guide tube 51 disposed within the guide passage 421 of the magazine base 42 and receiving a coiled spring 52 therein. One end 511 of the guide tube 51 is fixed to the magazine cover 43. A longitudinal slot 512 is provided axially in a tube wall of the guide tube 51.
The nail pusher plate 6 has two flanges 63 mounted movably on the magazine cover 43 and is slidable along the nail channel 41. A protrusion 62 projects from a back side 61 of the nail pusher plate 6 and extends into the guide groove 421 and the slot 512 through the guide passage 423. The coiled spring 52 is placed in contact with the protrusion 62 so that the nail pusher plate 6 is able to compress the coiled spring 52 when nails are loaded into the nail channel 41 and is urged by the coiled spring 52 to move forward.
To supply a nail stick to the nail magazine 4, the magazine cover 43 is slid along the magazine base 42. As the magazine cover 43 is slid, the guide tube 51 and the coiled spring 52 are moved by the magazine cover 43 along the guide groove 421 until they protrude from the guide groove 421 as best shown in
Referring to
Referring to
As mentioned above, the present invention employs the spring unit 5 which is embedded in the guide groove 421 of the magazine base 42 and which has the coiled spring 52 confined by the guide tube 51. Due to the use of the guide tube 51, the coiled spring 52 can be protected from the intrusion of dust and other contaminating substances. As a result, the performance of the coiled spring 52 can be well maintained, and the nail pusher plate 6 can slide and operate smoothly within the nail magazine 40.
While the present invention has been described in connection with what is considered the most practical and preferred embodiments, it is understood that this invention is not limited to the disclosed embodiments but is intended to cover various arrangements included within the spirit and scope of the broadest interpretations and equivalent arrangements.
Number | Name | Date | Kind |
---|---|---|---|
5297713 | Perra et al. | Mar 1994 | A |
5522533 | Mukoyama et al. | Jun 1996 | A |
5642849 | Chen | Jul 1997 | A |
6641019 | Hadfield | Nov 2003 | B1 |
6644530 | Chen | Nov 2003 | B1 |
6679413 | Miller et al. | Jan 2004 | B1 |
20050001001 | Nakano et al. | Jan 2005 | A1 |
20050121488 | Sun | Jun 2005 | A1 |
20050121490 | Sun | Jun 2005 | A1 |