BACKGROUND OF THE INVENTION (a) Field of the Invention
The present invention relates a memory stick and more particularly, to a memory stick having a USB port that is comprised of a metal casing, a plastic shell, a circuit board, a locating frame, and an end cap.
(b) Description of the Prior Art
A conventional memory stick having a USB (Universal Serial Bus) port essentially comprises a bottom cover shell, a top cover shell covering the bottom cover shell, a circuit board mounted in between the bottom cover shell and the top cover shell, and a plastic covering molded on the top and bottom cover shells. The procedure to connect the top cover shell to the bottom cover shell is complicated. Further, when molding the plastic covering on the top and bottom cover shell, the high temperature of the molding plastics may cause the USB connector of the circuit board to deform. Because the memory stick has no means to support the USB connector firmly inside the cover shells, the USB connector may be damaged easily during installation.
SUMMARY OF THE INVENTION The present invention has been accomplished under the circumstances in view. According to one aspect of the present invention, the memory stick comprises a hollow plastic shell; an elongated metal casing mounted in the hollow plastic shell, the elongated metal casing having a front end, a rear end, two shoulders symmetrically disposed at two opposite lateral sides thereof, and a front extension forwardly extended from the front end between the shoulders and exposed to the outside of the hollow plastic shell for insertion into a USB socket of an electronic device; a circuit board mounted inside the elongated metal casing, the circuit board having a USB connector forwardly extended from a front end thereof and suspended in the front extension of the elongated metal casing; and a locating frame mounted inside the elongated metal casing and capped on the connection area between the circuit board and the USB connector, the locating frame having two front end edges respectively stopped against the shoulders of the elongated metal casing. According to another aspect of the present invention, the memory stick further comprises an end cap capped on a rear end of the circuit board and inserted with the circuit board into the rear end of the hollow plastic shell. According to still another aspect of the present invention, the end cap is comprised of a first end cap member capped on the rear end of the metal casing, and a second end cap member inserted into the first end cap member. According to an alternate form of the present invention, the end cap comprises two retaining spring plates inserted into the rear end of the metal casing. The retaining spring plates each have a plurality of hooked portions respectively forced into engagement with respective retaining holes in the metal casing and respective retaining holes in the plastic shell.
BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is an exploded view of a metal casing and a plastic shell for a memory stick according to the first embodiment of the present invention.
FIG. 2 is an elevational assembly view ofFIG. 1.
FIG. 3 is an exploded view of a locating frame, a circuit board, and an end cap for a memory stick according to the first embodiment of the present invention.
FIG. 4 is an exploded view of a memory stick according to the first embodiment of the present invention.
FIG. 5 is an elevational assembly view of the memory stick according to the first embodiment of the present invention.
FIG. 6 is a sectional view of the memory stick according to the first embodiment of the present invention.
FIG. 7 is an exploded view of a metal casing and a plastic shell for a memory stick according to the second embodiment of the present invention.
FIG. 8 is an exploded view of a part of the memory stick according to the second embodiment of the present invention.
FIG. 9 is an exploded view of a part of the memory stick according to the second embodiment of the present invention.
FIG. 10 is an elevational assembly view of the memory stick according to the second embodiment of the present invention.
FIG. 11 is a sectional view of a part of the memory stick according to the second embodiment of the present invention.
FIG. 12 is an exploded view of a metal casing and a plastic shell for a memory stick according to the third embodiment of the present invention.
FIG. 13 is a perspective view of the end cap for the memory stick according to the third embodiment of the present invention.
FIG. 14 is an exploded view of the memory stick according to the third embodiment of the present invention.
FIG. 15 is an elevational assembly view of the memory stick according to the third embodiment of the present invention.
FIG. 16 is a sectional view of a part of the memory stick according to the third embodiment of the present invention.
FIG. 17 is an exploded view showing the memory stick used with a case according to the present invention.
FIG. 18 is an assembly view ofFIG. 17.
FIG. 19 is an exploded view showing the memory stick used with a cap according to the present invention.
FIG. 20 is an assembly view ofFIG. 19.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS.1˜6, a memory stick in accordance with a first embodiment of the present invention is shown comprised of ametal casing1, a hollowplastic shell2, acircuit board3, a locatingframe4, and anend cap5.
Themetal casing1, as shown inFIG. 1, is adapted to accommodate thecircuit board3, having twoshoulders11 symmetrically disposed at two opposite lateral sides thereof, afront extension12 forwardly extended from the front end between theshoulders11 for insertion into a USB socket of a computer, and twoeyelet lugs13 backwardly extended from the rear end and arranged in parallel.
The hollowplastic shell2 is molded from plastics and capped onto themetal casing1, keeping thefront extension12 and theeyelet lugs13 exposed to the outside (seeFIG. 2).
Thecircuit board3, as shown inFIG. 3, is an electronic circuit assembly constructed according to known techniques to provide a specific function or a combination of functions, having aUSB connector31 forwardly extended from the front side thereof. As illustrated in FIGS.4˜6, thecircuit board3 is inserted into themetal casing1 inside the hollowplastic shell2, keeping theUSB connector31 suspended in thefront extension12.
The locatingframe4 is mounted inside themetal casing1 and capped on the connection area between thecircuit board3 and theUSB connector31, having twofront end edges41 respectively stopped against theshoulders11 of the metal casing1 (seeFIG. 6).
Theend cap5 is capped on the rear end of thecircuit board3 and inserted with thecircuit board3 into one end of the hollowplastic shell2 to close the rear end of the hollowplastic shell2. After insertion of theend cap5 into one end of the hollowplastic shell2, aplastic covering51 is molded on theend cap5 and the eyelet lugs13 (seeFIG. 6).
According to the aforesaid first embodiment, the component parts of the memory stick can easily and quickly be assembled. Further, this embodiment uses themetal casing1 as the main body of the memory stick, the structural strength of the memory stick is well reinforced.
FIGS.7˜11 show a memory stick having a USB port according to a second embodiment of the present invention. According to this embodiment, theeyelet lugs13aof the metal casing, referenced by1a, are stamped to have a plurality of inwardly projectedhook portions131a; a hollow firstend cap element51ais capped on theeyelet lugs13aof the metal casing1aand inserted into one end of theplastic shell2; a solid secondend cap element52ais inserted into the firstend cap element51aand the inside of the metal casing1abetween theeyelet lugs13a. The secondend cap element52ahas a plurality of retainingholes521arespectively forced into engagement with the inwardly projected hookedportions131aof theeyelet lugs13aof the metal casing, referenced by1a.
FIG. 12˜16 show a memory stick having a USB port according to a third embodiment of the present invention. According to this embodiment, the memory stick is comprised of ametal casing1b, a hollowplastic shell2a, a circuit board3 (not shown), a locating frame4 (not shown), and anend cap5b. Thecircuit board3 and the locatingframe4 are similar to the like members of the aforesaid first embodiment. Themetal casing1bhas a plurality of retainingholes14bsymmetrically cut through the top and bottom walls near the rear end. Theplastic shell2ahas a plurality of retainingholes21asymmetrically cut through the top and bottom walls corresponding to theretaining holes14bof themetal casing1b. Theend cap5bcomprises tworetaining spring plates51bbackwardly suspended at different elevations. Theretaining spring plates51beach have a plurality of outwardly projectedretaining blocks511bfor engaging the retainingholes14bof themetal casing1band theretaining holes21aof theplastic shell2a. After mounting of thecircuit board3 and the locatingframe4 in themetal casing1band themetal casing1bin theplastic shell2a, theretaining spring plates51bof theend cap5bare inserted into the rear end of themetal casing1bto engage theretaining blocks511binto theretaining holes14bof themetal casing1band theretaining holes21aof theplastic shell2a. At final, a plastic covering52bis molded on theend cap5band a part of themetal casing1bin flush with theplastic shell2a.
Theaforesaid circuit board3 is a functional electronic circuit member that can be a single-function circuit means for data access, or a multi-function circuit means having wireless network receiver means.
Referring to FIGS.17˜20, acase6 orcap6amay be used to receive the memory stick or to cover thefront extension12, giving a protection to theUSB connector31.
A prototype of memory stick having a USB port has been constructed with the features of the annexed drawings of FIGS.1˜6. The memory stick having a USB port functions smoothly to provide all of the features discussed earlier.
Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.