Abstract: A method for assembling captive screw includes the steps of providing an annular base and positioning an annular washer on a top of the annular base; providing a screw, a coil spring, and a sleeve; downward passing the screw through the coil spring and a top opening of the sleeve; and threading a threaded section of the screw through the annular washer, so that the annular washer is fitted around a shank of the screw to locate below the top opening of the sleeve and above the threaded section of the screw. An inner circumferential edge of the annular washer is not worn away by the threaded section of the screw threaded therethrough, enabling the annular washer to keep a small inner diameter for tightly fitting around the shank of the screw and ensuring reliable assembling of the sleeve to the screw.

Abstract: A latch-type locating device including an outer sleeve having an annular engaging section formed at a front end thereof; an inner sleeve movably telescoped in the outer sleeve; a linking unit including a connecting rod located in the outer sleeve, an actuating rod connected to a front end of the connecting rod and fitted in the inner sleeve to interfere with the same, and a flange formed at a rear end of the connecting rod; a cap member being engaged with the flange of the linking unit; and an elastic element fitted around the connecting rod of the linking unit. The inner sleeve may be driven by the cap member and linking unit to extend from or retract into the outer sleeve to thereby lock an article in place or release the article.

Abstract: A packaging method for assembling a screw to a printed circuit board (PCB) includes the steps of: providing a screw having a head, a threaded shank, and a ferrule enclosing the threaded shank; mounting a stop ring on the threaded shank to maintain a predetermined height from top of the head to bottom of the ferrule; using a tool to fetch the screw and align the threaded shank with one through hole provided on the PCB; releasing the screw from the tool for a flange of the ferrule to extend into the through hole on the PCB; heating to melt a solder layer atop of the PCB, so that the ferrule is fixedly held to the PCB when the molten solder layer is cooled and hardened again; and removing the stop ring so that the threaded shank is retracted into the ferrule.

Abstract: An improved lock device includes: a locking unit, having a force exerted portion, a screw rod section and a screw thread section sequentially disposed on a surface of the force exerted portion, and an embedded groove disposed around the periphery of the screw rod section; and a ferrule, having an embedding edge and a latch groove, and the embedding edge installed into the embedded groove for movably coupling the ferrule to the locking unit, such that the invention can use the ferrule latch groove and the locking unit for locking a board with a base as required.

Abstract: An improved lock device includes: a ferrule having a through hole disposed at the center of the ferrule, and a groove disposed around the external periphery of the through hole; a locking unit having a force exerted portion and a screw rod that passes through the through hole; a resilient element sheathed onto the screw rod, and an end of the resilient element being disposed in a groove around the ferrule, and another end of the resilient element pressing against a surface of the force exerted portion; and a knob fixed onto the force exerted portion and movably coupled to the ferrule. Therefore, the resilient element can be fixed between the ferrule and the locking unit, and covered with the knob for preventing the resilient element from being damaged by external forces or tilted by external objects to achieve a better stability of using the resilient element.

Abstract: A method for assembling captive screw includes the steps of providing an annular base and positioning an annular washer on a top of the annular base; providing a screw, a coil spring, and a sleeve; downward passing the screw through the coil spring and a top opening of the sleeve; and threading a threaded section of the screw through the annular washer, so that the annular washer is fitted around a shank of the screw to locate below the top opening of the sleeve and above the threaded section of the screw. An inner circumferential edge of the annular washer is not worn away by the threaded section of the screw threaded therethrough, enabling the annular washer to keep a small inner diameter for tightly fitting around the shank of the screw and ensuring reliable assembling of the sleeve to the screw.

Abstract: A spring screw assembly includes a screw, an inner tube having a spring mounted therein, and a retainer tube being covered by a color coat. The inner tube is axially movably assembled into the retainer tube, and the screw may be extended into the retainer tube and the inner tube to extend through the spring with a rack portion near an upper end of the screw tightly engaged with an upper open end of the retainer tube. Therefore, screws of different sizes and retainer tubes with different color coats may be separately kept in stock, and screws meeting customer specifications may be assembled to retainer tubes having colors meeting customer color management system at a later time to complete the desired spring screw assemblies.

Abstract: An anti-disengaged screw device includes a stem member and a nut member. The stem member is composed of a screw rod section and a disk head and a plurality of exertion wedges are disposed on the disk head as an exertion point of a torsion force. The nut member provides an axial hole and a deep countersink for the screw rod section passing through the axial hole and the disk head being received in the countersink. A lock configuration is formed between the circumference of the countersink and the exertion wedges for being inserted and turned with a key arm, which providing wedge recesses and an annular lock head corresponding to the lock configuration, such that it is capable of preventing from being inserted in and turned with an ordinal tool directly and protecting the screw device from being disassembled.

Abstract: A structure of plate positioning arrangement is disclosed. The structure of plate positioning arrangement comprises a shank extending at a bottom surface of a head of the positioning element, and a cap produced through a plastic injection molding process for covering and surrounding the edge of the head is for providing a receiving space below the head for fitting a fixing element. A through space is formed at a central region of the fixing element for fitting the shank of a positioning element, wherein the shank is fixed with a resilient element. Thus the cap is capability to allow the positioning element move in the same way within the through space of the fixing element.

Abstract: A structure of plate positioning arrangement is disclosed. The structure of plate positioning arrangement comprises a shank extending at a bottom surface of a head of the positioning element, and a cap produced through a plastic injection molding process for covering and surrounding the edge of the head is for providing a receiving space below the head for fitting a fixing element. A through space is formed at a central region of the fixing element for fitting the shank of a positioning element, wherein the shank is fixed with a resilient element. Thus the cap is capability to allow the positioning element move in the same way within the through space of the fixing element.