Length adjustable trigger assembly for nailer

[0002] The present invention relates to a trigger assembly for a pneumatic nailer wherein the limit member is movably connected to the frame of the assembly and an end is engaged with one of notches in an end collar which is threadedly connected to the frame. The end collar is positioned by the engagement of the limit member.

[0003] A conventional trigger assembly for a pneumatic nailer generally includes a bar that has one end engaged with the trigger and the other end of the bar is connected to a frame. The frame is movably connected to the body of the nailer and an ejection nozzle of the nailer is located beside the frame. When nailing, the user contacts an end of the frame of the nailer to the object to be nailed and then pushes the nailer toward the object so that the frame is moved backward by the reaction force from the object. The movement of the frame moves the bar and the bar activates the trigger to a ready-to-shoot position. When the trigger is pulled, the nail comes out from the ejection nozzle. In other words, the trigger assembly is a safety means which requires the user to push the end member against the object to activate the trigger. However, the lengths of the ejection nozzles of different specification or brands are different so that the length of the trigger assembly has to be correspondingly adjusted. Although the length of some of the conventional trigger assemblies can be adjusted, it requires a tool such as a spanner. If the user does not have the spanner with the correct specification, the trigger assembly cannot be adjusted.

[0004] In accordance with one aspect of the present invention, there is provided a trigger assembly for a pneumatic nailer and comprises a frame having a threaded end connected to a first end of the frame and a spring is engaged with a second end of the frame. A bar is connected between the first end of the frame and a trigger of the nailer. A limit member is movably connected to the frame and an engaging member is located on a first end of the limit member. An end member is threadedly mounted to the threaded end and a plurality of notches are defined in an end of the end member. The engaging member of the limit member is engaged with on of the notches.

[0005] The primary object of the present invention is to provide a trigger assembly for a pneumatic nailer wherein the length of the whole trigger assembly can be adjusted according to practical needs.

[0006] The present invention will become more obvious from the following description when taken in connection with the accompanying drawings which show, for purposes of illustration only, a preferred embodiment in accordance with the present invention.

[0007] FIG. 1 is an exploded view to show a trigger assembly of the present invention;

[0008] FIG. 2 is a side elevational view to show the trigger assembly of the present invention;

[0009] FIG. 3 is another side elevational view to show the trigger assembly of the present invention;

[0010] FIG. 4 is a side elevational view to show the trigger assembly of the present invention, wherein the nailer is pushed toward the object to be nailed;

[0011] FIG. 5 is another side elevational view to show the trigger assembly of the present invention as shown in FIG. 4, and

[0012] FIG. 6 is a cross sectional view to show the guide flanges of the limit member is engaged with a lower edge of the frame.

[0013] Referring to FIGS. 1 to 3, the trigger assembly of the present invention comprises a frame 23 having a first push plate 232 extending from a top of the frame 23 and a threaded end 233 which is a threaded collar connected to a first end of the frame 23. A rod 230 extends from a second end of the frame 23 and a spring 22 is mounted to the rod 230 and biased between the second end of the frame 23 and a front end 10 of the nailer 1. A bar 20 has two engaging slots 201 defined in a first end thereof and two ribs 231 (only one is shown) connected to the first end of the frame 23 are engaged with the engaging slots 201. A second end 200 of the bar 20 is connected to a trigger 11. The frame 23 has a slot 234 defined therein and the slot 234 is ended at a close end 2340.

[0014] A limit member 21 is movably connected to the frame 23 and has a protrusion 211 which is movably received in the slot 234. A spring 220 is biased between the close end and the protrusion 211. A second push plate 210 extends from the limit member 21. An engaging member 212 is located on a first end of the limit member 21 and two guide flanges 213 extend from an inside of the limit member 21. The threaded end 233 has grooves 2331 defined in an outer periphery thereof so that the guide flanges 213 are movably engaged with the grooves 2331, and the guide flanges 213 are engaged with an end of the frame 23 as shown in FIG. 6.

[0015] An end member 24 has inner threads 240 which is threadedly mounted to the threads 2330 of the threaded end 233 and a plurality of notches 241 are defined in an end of the end member 24. The engaging member 212 of the limit member 21 is engaged with on of the notches 241.

[0016] Referring to FIGS. 4 and 5, when pushing the nailer 1 against the object 9 to be nailed, the frame 23 is pushed toward the nailer 1 so that the ejection nozzle firmly contacts the object 9 and the movement of the frame 23 pushes the bar 20 to activate the trigger 11 which can be pulled to nail the object 9.

[0017] When the length of the assembly is to be adjusted, the user pushes the second push plate 210 so as to remove the engaging member 212 from the notch 241 so that the end member 21 can be rotated on the threaded end 233 to adjust the total length of the assembly. The end member 21 is then released to let the engaging member 212 engage one of the notches 241 again. The adjustment needs no tools and is conveniently completely by the user himself or herself.

[0018] While we have shown and described the embodiment in accordance with the present invention, it should be clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention.