Patent Application
20060156840
(a) Technical Field of the Invention
The present invention relates to a drive rod of a tool lock device which functions as a clutch device, and more particularly, to a special design for combining a mental rod body and a plastic push head which will increase variety of the push head and strength of the rod body to reach the purpose of easy-to-fabricate and prolonging the usage life of the drive rod.
(b) Description of the Prior Art
In general, when a tool set needs the function to connect or release its parts, it usually needs a lock device. As shown in
Thus, the drive rod 20 springs back and move upward to a stable position before users apply force to it, while the arc-concave guide edge 23 of the ball-containing groove 22 in the rod body 21 is capable of pushing the positioning steel ball 18 outward the ratchet wheel 10 surface of the lock rod 11, so as to enable the positioning steel ball 18 to slide into a groove 36 inside the corresponding sink hole 35 of the tool head 30 and to the purpose of locking, as shown in
To consider the identity of a tool set, the above-mentioned drive rod 20 is primarily made of iron and formed by forging for the features of unity, firmed structure strength and material-saving. In general, the metal drive rod 20 is formed by forging, which accompanies lots of peripheral facilities. Meanwhile, the larger the push head 25 is, the more user-friendly it is. However, when the diameter differences between the rod body 21 of the drive rod 20 and the push head 25 of the drive rod 20 are large, the quantity of the forging mold will increase, which will simultaneously increase the manufacturing difficulty and cost. Furthermore, in order to facilitate the users finding the push head 25, the surface of the drive rod 20 or push head 25 will usually be electroplated or painted with colors. The colors, however, easily come off by accident hit and lack variety, which will lose the economic benefits.
Thus, a plastic drive rod 40 is developed, as shown in
As previously described, the present drive rod structures have different problems no matter they are made of metal or plastic. In other words, there is not a drive rod of the lock device which is easy to be fabricated, with enough structure strength and with everlasting color among all the public information. Thus, the present invention is invented to solve all the problems.
Hence, the inventor, owing extensive industry experience in research and manufacturing departments, works hard and tries to search for solutions for the existing drive rod problems. Eventually, he successfully invents a new drive rod structure of a lock device which is easy to be manufactured, with firmed enough structure strength and with everlasting color.
The primary purpose of the present invention is to substantially reduce the manufacturing cost and increase the usage life of a tool lock device.
Thus, embodiments of the present invention provide technologies as below descriptions to implement previous mentioned purposes and performances, where a drive rod mainly comprises of a rod body and a push head.
The rod body is made of metal and forms a ball-containing groove at end surface adjacent to the top end. An arc-concave guide edge is formed in the end of the ball-containing groove, adjacent to the top end, in order to push the positioning steel ball.
Subsequently, a kind of colored material is selected for the push head and the rod body is disposed in the push head mold from the end, opposite to the ball-containing groove. By means of one-shot plastic injection technology, the push head with the rod body end are combined in one unity, and further form the complete drive rod.
According to the process, the drive rod manufacturing is simplified effectively while its structure strength is reinforced, and further reaches the features of easy to be fabricated, firmed structure strength and everlasting color to enhance the economic benefits.
The foregoing object and summary provide only a brief introduction to the present invention. To fully appreciate these and other objects of the present invention as well as the invention itself, all of which will become apparent to those skilled in the art, the following detailed description of the invention and the claims should be read in conjunction with the accompanying drawings. Throughout the specification and drawings identical reference numerals refer to identical or similar parts.
Many other advantages and features of the present invention will become manifest to those versed in the art upon making reference to the detailed description and the accompanying sheets of drawings in which a preferred structural embodiment incorporating the principles of the present invention is shown by way of illustrative example.
The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.
The present invention relates to a drive rod structure of a lock device which is easy to be fabricated, with firmed structure strength and with everlasting color, as shown in
Still referring to
Subsequently, one kind of material is selected for coloring the push head 55, and then one end of the rod body 51, opposite to the ball-containing groove 52, is disposed into a mold of the push head 55, wherein patterned indented grooves could be formed on the end surface, corresponding to the push head 55, of the rod body 51 for the purpose of enhancing the combination strength. By means of one-shot plastic injection, the push head 55 is formed at one end of the rod body 51 to one unity, which is the finished product of the drive rod 50.
Thus, a pre-fabricated iron rod body 51 is disposed in the mold of the push head 55, and then the drive rod structure of a lock device is formed with one-shot plastic injection combining the push head 55 at one end of the rod body 51, having the features of easy to be fabricated, finned structure strength and everlasting color.
The present invention includes below advantages and values when being practically used:
Easy to be fabricated: The rod body 51 have identical outer diameter, without further being fabricated and needs only pre-forming the ball-containing groove 52 and the arc-concave guide edge 53 by milling. Compared to prior arts, the present invention reduces the manufacturing difficulty greatly and enhances the feature of easy to be fabricated obviously.
(A) Firmed enough structure strength: The rod body 51 is still kept the firmed structure strength as prior arts because of the metallic material. Thus, the arc-concave guide edge 53 of the ball-containing groove 52 does not deform easily and lose its functions. Compared to prior arts, the present invention has the features of not easy to be destroy and prolonging the usage life.
(B) Low cost: As above-described, the present invention includes both the features of easy to be fabricated and firmed enough structure strength, so it can not only cut out the extra manufacturing facilities, human resources, materials, but also reduce the maintenance fee. Thus, the manufacturing cost is decreased greatly.
(C) Everlasting color: the push head 55 is made of a colored plastic material, instead of being electroplated or painted with color on the surface, so it needs only the technology to keep correct color and will not be destroyed by accident hit. Thus, the present invention can enhance its function and prolong its usage life.
To sum up, the present invention simultaneously includes several features and advantages from above-mentioned descriptions, and thus increasing overall economic benefits effectively. Therefore, the present invention is an excellent invention departing from any prior arts in this field and meets the requirements of the patent application. Thus, it is intended to apply to a new model legally.
It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.
While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.
