1. Field of the Invention
The present invention relates to an adjusting screw for door frames and window casings and particularly to an adjusting screw for door frames and window casings that is easy to fabricate and assemble.
2. Description of the Prior Art
Referring to
However, the surface of the screw 11 usually has been plated. Forming the groove 115 by compression tends to damage the plated layer. Hence after used for a period of time, rust easily occurs to the fabrication spot and smears the window or door. This spoils the aesthetic appeal of the window or door.
In view of the aforesaid problem occurred to the conventional adjusting screw, the present invention aims to provide an adjusting screw for door frames and window casings that is easy to fabricate and assemble. It includes a screw running through a screw sleeve. The screw sleeve has a longitudinal slit so that when a latch flange formed at a rear section of the screw passes through a first step orifice of the screw sleeve the first step orifice is expanded to a larger diameter due to elastic deformation such that the latch flange is retained at a front orifice edge of the first step orifice. And the screw has a head end flange at a rear section to be retained at a rear orifice edge of the first step orifice. By means of such a structure fabrication is easier and assembly is faster.
In one aspect of the invention, the screw sleeve has at least one aperture formed at a distal end of the longitudinal slit that is greater than the width of the longitudinal slit. The aperture may be, but not limited to, circular to prevent the longitudinal slit from cracking at the distal end under forces so that the alteration amount of the elastic deformation of the first step orifice can be greater.
In another aspect of the invention, the latch flange of the screw has a first slant side forming a first included angle with a vertical line, preferably at 5°.
In yet another aspect of the invention, the latch flange of the screw has a second slant side forming a second included angle with a horizontal line, preferably at 30°.
In yet another aspect of the invention, the longitudinal slit may be formed in a spaced manner so that when the screw passes through the screw sleeve during assembly a tool action zone thereof can receive a ramming force to thrust the latch flange to pass through the first step orifice forcefully to fully split the spaced longitudinal slit.
The foregoing, as well as additional objects, features and advantages of the invention will be more readily apparent from the following detailed description, which proceeds with reference to the accompanying drawings.
Referring to
The screw sleeve 32 is a hollow barrel and has a through hole 320 which forms a first step orifice 323 (referring to
The screw 31 is formed in a nail profile and has an external screw thread 311 at a front section, a latch flange 313, a head end flange 314 and a tool action zone 215 at a rear section 312.
By means of the construction set forth above, when in assembly the screw 31 passes through the through hole 320 of the screw sleeve 32, with the external screw thread 311 passing through the first step orifice 323. A tool is use to apply a ramming force on the screw 31 through the tool action zone 315 to force the latch flange 313 ramming through the first step orifice 323 so that the screw sleeve 32 is expanded outward from two sides of longitudinal slit 324. An elastic deformation is generated to expand the diameter of the first step orifice 323. After the latch flange 313 has passed through the first step orifice 323, the longitudinal slit 324 returns to its original shape, and the latch flange 313 is latched at a front orifice edge C1 of the first step orifice 323. The head end flange 314 of the screw 31 is retained at a rear orifice edge C2 of the first step orifice 323. Thus assembly can be accomplished rapidly.
When in use (referring to
The latch flange 313 has a first slant side a1 which forms a first included angle θ1 with a vertical line a, preferably 5°, and a second slant side a2 which forms a second included angle θ2 with a horizontal line a′, preferably 30° (referring to
The screw 31 and the latch flange 313 are formed and fabricated before plating, thus coupling with the screw sleeve 32 does not damage the surface. Assembly can be done quickly. It offers a significant improvement over the conventional technique.
While the preferred embodiment of the invention has been set forth for the purpose of disclosure, modifications of the disclosed embodiment of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.