Abstract: An electric device has a plug connection provided with a plug that has at least one contact pin and further provided with a mating plug receptacle that has at least one contact tube. A closure device is arranged on the plug receptacle and has a closed position for protecting the at least one contact tube. The closure device is moved by the plug into an open position when the plug is inserted into the plug receptacle, wherein in the open position the at least one contact tube is released.

Abstract: An electrical connector includes a base having a number of passageways, a cover mounted to the base, a cam mounted between the base and the cover, and a protecting mechanism. The cover has a number of through holes corresponding to the passageways and is capable of slidably moveable relative to the base. The cam is able to rotate to drive the cover to move relative to the base. The protecting mechanism includes a cover plate mounted in the cover and a base element mounted in the base. The cover plate includes a planar main portion, a via hole defined in a middle thereof, and a pair of stoppers bent toward the cover to engage to restrict the cam to rotate within a certain angle.

Abstract: An integrated circuit socket includes an insulating housing having a plurality of contact openings arranged in rows and a recess that receives an integrated circuit package. A plurality of contacts arranged in a first contact group and a second contact group in the insulating housing. Each of the contacts has a flat plate fixing member fixed in the contact opening, a connecting member extending from a lower portion of the fixing member, and a spring member extending diagonally upward from an upper portion of the fixing member. The spring member has a contact member extending into the recess. The contacts are arranged in the contact openings such that the spring members are arranged at an angle offset from a direction of arrangement of the rows and the spring arms of the first contact group are arranged in a direction opposing the spring arms of the second contact group.

Abstract: A burn-in socket comprises a base, a plurality of terminals received in the base, a lid mounted upon the base, and a sliding member mounted on the base. The terminal has a movable arm and a static arm, the lid has a number of actuating portions downwardly extending from the bottom thereof to drive the sliding member. The actuating portion of the lid drives the sliding member to move in both a longitudinal direction and a transverse direction, so that the movable arm moves not only in the longitudinal direction but also in the transverse direction to avoid interference with a static arm of an adjacent terminal.

Abstract: A dual force single point actuation integrated load mechanism for securing a computer processor to a socket, the dual force single point actuation integrated load mechanism including a base mounted around the socket; and a load plate rotatably coupled to the base and secured to the base when an activate lever on a first side of the base and a hinge lever on a second side of the base are secured above the load plate; wherein the activate lever on the first side of the load plate is rotatably coupled with the base and is secured when the activate lever is fully rotated; wherein the hinge lever on the second side of the load plate is rotatably coupled with the base and connected to the activate lever such that rotating the activate lever rotates the hinge lever; and wherein the hinge lever is secured when the activate lever is secured.

Abstract: An electrical connector (1) comprises a base (10) with a plurality of contacts (19) received therein, a cover (11) slidably mounted on the base (10), a protecting mechanism (12) comprises a cover plate (13) retained in the cover (11) and a bottom plate (14) retained in the base (10), a cam actuator (16) rotatably assembled to the base (10), the cover (11) and the protecting mechanism (12) for actuating the cover (11) to slid on the base (10), the bottom plate (14) comprises a first plate (142) and a second plate (141), the first plate (142) comprises a base portion (1421) and a first engaging portion (1422) extending curvedly from the end of the body portion (1421).

Abstract: An electrical contact for electrically connecting with a pin of an electrical package, includes a base portion as a planar board-like, a first and a second mating fingers jointly configuring a room for receiving the pin, and a flexible arm being inclined relative to the base portion and connecting with the base portion and one of the first with the second mating fingers.

Abstract: An electrical connector includes a base defining at least a passageway extending from an upper surface of the base to a bottom surface of the base. An electrical contact is inserted into the passageway from the bottom surface and includes a retention portion engaging with an inner wall of the passageway. A lead-in chamfer is formed on an edge of the retention portion and toward the inner wall such that the lead-in chamfer is offset away an edge of the inner wall of the passageway and the contact is inserted by guiding of the chamfer.

Abstract: An electrical connector comprises an insulating housing, a pair of levers and a bracket. The insulating housing includes a receiving slot for receiving a chip. The bracket encircles the insulating housing, which includes several side walls and a empty portion surrounded by the side walls, on the side wall there defines a fasten portion. The lever is set beside two opposite side of the chip, which comprises a pintle portion, an operating portion and a main portion connecting the pintle portion and the operating portion, the pintle portion is received in the fasten portion of the bracket. Protruding towards inner side from the main portion there forms a press portion for retain the chip. The structure of the invention is simply, which economizes the cost of manufacture and is efficient for operating.

Abstract: The present invention discloses an electrical connecting device adapted to receive a chip unit. The electrical connecting device includes an insulation base, a terminal set, a circuit board, a cover and a driving mechanism. The insulation base is formed with a terminal area and a first pierced hole. The terminal set is disposed correspondingly in the terminal area. The circuit board is disposed under the insulation base. The circuit board is formed with a pad area, which is disposed correspondingly to and under the terminal area for the terminal set to be soldered on. The circuit board is formed with a through hole corresponding to the first pierced hole. The cover is horizontally and slidably covering the insulation base. The driving mechanism at least has a metal bushing covered into the first pierced hole and the through hole. The driving mechanism further has a cam, which has a driven portion extending to form a first cylinder into the first pierced hole.

Abstract: An LGA connector, for interconnecting an IC package with a printed circuit board, includes an insulative housing having a number of electrical terminals received therein, a metal stiffener mounted to the insulative housing, a cover and a lever pivotally engaged to two opposite ends of the stiffener, respectively. The insulative housing defines an opening for receiving the IC package and two walls extending upwardly thereof, and each wall disposes a first cutout. The stiffener surrounding the insulative housing defines two side walls adjacent and parallel to the walls of the insulative housing. Each side wall disposes a second cutout corresponding to the first cutout so as to so as to remove the IC package easily.

Abstract: A socket connector (1) for electrically connecting a Central Processing Unit (CPU) with a Printed Circuit Board (PCB), includes a base (10), a cover (20) and a shaft (30) attached to the cover and pivotally driving the cover to move on the base. The base has a plurality of conductive contacts received therein and defines a plurality of apertures (104) in the middle thereof. The cover forms a plurality of pillars (208) extending through the apertures and forward a lower surface of the base. The pillars are moveable in the apertures along with the cover.

Abstract: Disclosed is an electrical connector including a plurality of conductive terminals. The conductive terminal comprises a base and a pair of arms. Each arm includes a connection part extending forwardly from the base, a first bending part bent and extending upwardly from the connection part, a second bending part bent upwardly from the first bending part, a first elastic arm extending upwardly from the second bending part, and a contact section formed at a rear end of the first elastic arm. The first and second bending part are bent away from the other arm while the first elastic arm extends toward the other arm. The minimum distance between the two first elastic arms and that between the two second bending parts are larger than the minimum distance between the two connection parts and that between the two contact sections.

Abstract: A socket connector configured such that elongated guide holes are formed in the housing so as to receive guide members of a device to be connected, and a slide member is attached to the housing to be slidable in the longitudinal direction of the elongated guide holes so as to restrict the guide members to their initial positions. The socket enables direct placement of the device on the housing, can shorten the projection length of projection terminals of the device, can facilitate positioning of the device to thereby enhance the easiness of attachment operation, can prevent bending of the projection terminals, can cope with an increase in density of the projection terminals, and has a simple structure.

Abstract: An electrical connector and a terminal thereof are disclosed. The base portion of the terminal extends upwards to form two flexible arms. Each of the two flexible arms extends towards each other to form a leaning portion. There is a gap between the two leaning portions. Two arm portions extend from two sides of the base portions. The two arm portions respectively have a contact portion. The two contact portions and the two leaning portions are disposed at a front location and a rear location. The two leaning portions and the two contact portions surround to form a receiving space. The present invention can prevent the pins of the chip module from being deformed, improve the usage life of the terminals, and assure that the chip module is electrically connected with the electrical connector.

Abstract: An electrical connector (100) includes a first insulative housing (1), a second insulative housing (2), a soldering contact (4) positioned in the second insulative housing (2) for electrically connecting with a circuit substrate and an electrical contact (3) made of wire, the electrical contact (3) comprising a first retention portion (31) positioned in the first insulative housing (1) with a contacting portion (311) extending beyond the first insulative housing (1) for electrically connecting to an electronic package, a spring portion (32) and a second retention portion (33) positioned in the second insulative housing (2) connected with the soldering contact (4), when the electrical contact (3) is pressed down by the electronic package, the spring portion (32) expanded outwardly and the electrical contact (3) only moves along up-to-down direction, thus make the contacting portion (311) engages with the electronic package with minimal wiping length.

Abstract: An IC socket comprises a base, a cover moveably mounted to the base, and an actuating mechanism driving the cover to move between a first position and a second position. The base includes a plurality of passageways and at least a rib extending upwardly from a top surface. The cover defines a hole corresponding to the rib and has a plurality of apertures corresponding to the passageways.

Abstract: An electrical connector assembly (100) includes a first retaining half (51) securely mounted on a printed substrate, a load plate (60) pivotally attached to the first retaining half, a second retaining half (52) opposite and distant to the first retaining half, a lever (70) pivotally attached to the second retaining half and including a cam portion (706) capable of pushing down a pressed section (610) from the clip toward the printed substrate, and a connector (30) mounted between the first and second retaining halves.

Abstract: An LGA socket for receiving substrate packages of various sizes and a method of fabricating the socket. In an embodiment, the socket has a planar surface for seating a substrate package. Socket contacts are disposed on the planar surface in a layout common to the layout of interconnects formed on the bottom of substrate packages the socket is designed to receive. A plurality of socket locating features is formed on the socket body to prevent lateral displacement of a reference substrate package. A corresponding number of package locating features are formed on the substrate body of packages larger than the reference substrate package. Each of the socket locating features meshes with the corresponding package locating feature of the larger package.

Abstract: An electrical connector (100) includes an insulating base (10) defining therein a plurality of receiving units (11) each surrounded by sidewalls (13). A cover (20) is moveably disposed on the insulating base (10) and includes a plurality of apertures (21) each aligned with the receiving units (11). A driving mechanism (30) is disposed on the base to drive the cover (20) to move along the base (10). Each receiving unit (11) includes a leading-and-positioning arrangement (14) extending from an inner sidewall (13b) thereof, and dividing the receiving unit into a first space (110) and a second space (111). A plurality of terminals (40) is received in said receiving units (11), each comprises a contacting portion (42) projecting into the second space (111) of the receiving unit (11).

Abstract: An electrical connector (1) comprises a base (10) with a plurality of contacts (19) received therein, a cover (12) slidably mounted on the base (10), a protecting mechanism (14) comprises a cover plate (141) retained in the cover (12) and a bottom plate (142) retained in the base (10), a cam actuator (16) rotatably assembled to the base (10), the cover (12) and the protecting mechanism (14) for actuating the cover (12) to slid on the base (10), the base (10) comprises one or more block members (1011) extending upwardly, the bottom plate (142) defines a second through hole (1421), when assembled, the block member (1011) is positioned in the second through hole (1421) and the cam actuator (16) goes through the second through hole (1421).

Abstract: The present invention relates to an electrical connector used for connecting a mating device with multiple pins and comprising a body and at least one terminal. The terminals are secured in the body and have at least one coarse surface and at least one glossy surface with a protection layer of noble metal. The coarse surfaces and the glossy surfaces locate at a position for making the pins scrape with the coarse surfaces and finally contact the coarse surfaces and the glossy surfaces simultaneously.

Abstract: An IC socket (1) for receiving an IC package having a plurality of pins extending downwardly includes a base (2), a plurality of terminals (7) received in the base, a cover (5) mounted upon the base (2), and a cam (6). The cover (5) includes a carrying section (50) for carrying the IC package and a cam-receiving section (51). The carrying section (50) forms a plurality of through holes (500) for insertion of the pins of the IC package. The cam (6) is disposed at the cam-receiving section (51) for actuating the cover (5) to move with respect to the base (2) in a first direction A. The cam (6) is offset from a central line CL of the carrying section (50) which extends along the first direction A.

Abstract: An electrical connector with sliding connection has a main body and a mated device, which both can electrically and mechanically connect together. The main body has a concave room. The concave room has an electrical connector that can slide back and forth by elasticity and outer forces. The mated device has a mated connector compared to the electrical connector. When connecting the electrical connector with the sliding connection, the present invention can transversely connect the electrical connector and the mated connector, and then by vertically sliding clamp the main body and the mated device. The electrical connector will follow the sliding motion.

Abstract: An electrical connecting assembly includes an insulating base, terminals, a PCB, a cover, and a driving unit. The insulating base has receiving holes and a first hole. The terminals are disposed in the receiving holes. The PCB has a first connecting area and has a second connecting area. The cover can be moved horizontally on the insulating base. The cover has a second hole. The driving unit has one metal sheath, at least one welding portion, and one cam piece. Two ends of the welding portion are respectively connected to the metal sheath and the second connecting area. The cam piece has an actuating portion, a first cam shaft, and a second cam shaft which is eccentric with first cam shaft. The first cam shaft is disposed inside the first hole and is held by the metal sheath. The second cam shaft is disposed inside the second hole.

Abstract: The electrical connector includes a body having a terminal-receiving area, at least one terminal disposed in the corresponding terminal-receiving area, a cover sliding along a sliding route and assembled on the body. The top surface of the cover has an insertion area with holes. When the cover slides to a position, the insertion area is corresponding to the terminal-receiving area for pins of a chip module passing through the insertion area and terminal-receiving area to electrically connect with the terminal. At least one receiving plane is disposed on the top of the cover for holding. The receiving plane is higher than the insertion area. The two opposite sides of the cover outside the insertion area have a lateral protrusion protruding upwards. The lateral protrusions are parallel to the sliding route of the cover.

Abstract: An electrical contact (1) includes an elongate planar base portion (10), a pair of contact engaging portions (11) orthogonal to the planar base portion, a stopper portion (12) coplanar with the contact engaging portions, and a solder portion (13) orthogonal to the planar base portion and opposite to the contact engaging portions. The stopper portion connects one of the pair of contact engaging portions and extends to a back side of the planar base portion.

Abstract: An electrical connector includes a housing and a terminal. The housing includes a terminal hole and a lance portion disposed in the terminal hole. The lance portion includes a guide surface; an engaging front edge surface; and a regulated surface. The terminal includes a contact portion; a connection portion; an engaging portion; a curved portion; and a regulating portion. The engaging portion pushes the guide surface to deform and is guided with the guide surface when the terminal is inserted into the terminal hole. When the terminal is completely fitted in the terminal hole, the engaging portion faces the engaging front edge surface and engages the lance portion.

Abstract: An electrical connector includes an insulative housing (1) and an electrical contact (2) received in the insulative housing. The electrical contact includes a planar main portion (20), a soldering portion (21) extending horizontally from a lower end of the main portion and first and second elastic arms (23, 24) extending from an upper end of the main portion. The first elastic arm has a first connecting portion (232) connecting to the main portion. The second elastic arm has a first curved portion (243) connecting to the main portion, a second curved portion (244) connecting with the first curved portion and a connecting portion (242) vertically extending from the second curved portion. Two contact portions (230, 240) extend respectively and laterally from the first and second connecting portions. A first distance defined between the connecting portions is larger than a second distance defined between the contact portions taken from a side view.

Abstract: A zero insertion force (ZIF) socket assembly comprises a ZIF socket and a pick-up cap. The ZIF socket includes a base, a cover, and a cam assembled to the base and rotated for driving the cover to move relative to the base between an opened position and a closed position. The pick-up cap is mounted to the ZIF socket and has a lock-up abutting against the cam for preventing the cam from rotating.

Abstract: An electrical connector includes a base having a number of passageways and a compartment in one end thereof. A cover is mounted to the base. The cover has a plurality of through holes corresponding to the passageways and a driving compartment corresponding to the compartment. The driving compartment has one single-step stopper. One recess is positioned adjacent the stopper and receives a stiffener therein for supporting the stopper. A cam is disposed in the driving compartment and the compartment to drive the cover moving relative to the base along a front-to-back direction.

Abstract: An electrical socket comprises an insulative housing including a base with a cover moveably assembled thereon. An actuator is arranged between the base and the cover, and has a lever and a cam device to move the cover from a first position to a second position, wherein an interengaging arrangement is arranged between the lever and the housing, and has guiding means for properly positioning the lever and the cover in the second position easily.

Abstract: An electrical contact (10) using for electrically connecting a chip module to a printed circuit board includes a base portion (101), an arm portion (102) extending from side of the base portion (101), a retaining device (104) extending downwardly from the base portion (101) for retaining a soldering ball (20). The retaining device further comprises a plurality of clipping portions, said clipping portions forming a retaining space (1044) for receiving the soldering ball jointly, and at least one of said clipping portions defining a guiding surface (1046) and a recess (1045). By above way, steady attachment between the soldering ball and the contact is achieved.

Abstract: An electrical connector for electrically connecting a pin leg of a CPU with a trace of a PCB includes an insulative housing (3) and a contact (1). The contact includes a base (10) and a pair of arm sections (20) oppositely extending from lateral sides of the base for engagement with the pin leg. The base has a body section (12) for being secured in the insulative housing and a soldering section (14) for being soldered onto the PCB. Each arm section forms a heave (24) to interfere with the insulative housing because of deformation of the arm sections.

Abstract: An electrical connector comprises a base having a plurality of passageways for receiving a number of contacts, a cover mounted to the base and including a plurality of through holes corresponding to the passageways, and a lid having two opposite edges. One edge is mounted upon the cover to drive the cover to move relative to the base, and the other edge locks the base when the lid is located at a close position relative to the base.

Abstract: An example socket includes a plurality of contacts and a base. The base includes exterior walls and interior walls which extend between the exterior walls to form openings within the base such that each opening in the base includes one of the contacts. At least some interior walls include indentations that are adapted to receive projections on the contacts such that when the projections on the contacts are positioned within indentations in the interior walls, the contacts are secured to the base. Another example socket includes a first group of the interior walls that is oriented in a first direction and a second group of the interior walls oriented in a second direction that is orthogonal to the first direction. The first and second groups of interior walls form openings within the base with the first group of interior walls being higher than the second group of interior walls.

Abstract: The present invention provides an electrical connector for electrical connecting an IC package having a plurality of pins to a PCB. The electrical connector comprises a base defining a plurality of passageways, a plurality of contacts received in the passageways, and a cover moveable relative to the base from a first position to a second position. The cover defines a plurality of through holes corresponding the passageway. The contacts each have a resilient arm. During movement of the cover from the first position to the second position, pins of the IC package will compress the resilient arms of the contacts along a direction and the resilient will exert a normal force on the pins, thus ensuring proper connection between the resilient arm and the pins; wherein direction of the normal force is opposite to the direction of the pins moving.

Abstract: A connector (10) has a housing (20) that is connectable with a mating connector (90). A sliding force multiplying mechanism can slide relative to the housing (20) in a direction intersecting a connecting direction for proceeding with a first part of a connecting operation. A rotating force multiplying mechanism then can be rotated relative to the housing (20) for proceeding with a second part of the connecting operation. The sliding force multiplying mechanism and the rotating force multiplying mechanism operate separately and are formed on a single lever (40).

Abstract: An electrical connector socket, comprising an insulating base defining a sector and a surrounding portion surrounding the electric area, a cover slidably mounted on the base, a metal reinforced device with a rectangular frame sandwiched between the base and the cover, and an actuation mechanism is also pivotally sandwiched between the base and the cover. The sector divided into several sections that each has at least one set of edge to form at least one channel thereon, and the metal reinforced device defines a bridge portion corresponding to the channel of the base. When the rotation of actuation mechanism, the metal reinforced device sustain greater forces exert on the base and the cover, the base and cover are resistant to deformation and maintain the effective displacement of the cover respect to the base.

Abstract: A socket adapted for electrically connecting an IC package and a PCB, comprising: a body mounted on the PCB for electrically connecting the IC package, two bolts mounted on the PCB and beside the body and a clip for retaining the IC package in the body. The bolt has a header portion on the top with biggest size, a middle portion and a screw portion engaging with the PCB. The clip has two attaching portions, each defining a hatch at a free end thereof, the clip links with the bolt by inserting the attaching portion toward the bolt to make the middle portion be received in the hatch and the header portion be upon the hatch to prevent the attaching portion from upward movement.

Abstract: An electrical connector (1) for electrically connecting an electronic package with a circuit substrate. The connector includes a housing (11), a fastening device assembled with the housing, and a stiffener (12) surrounding the housing. The stiffener includes a back end (123), and a pair of spaced first walls (125) adjoining the back end. Each first wall has a latch (128) extending upwardly therefrom, and then bends inwardly. The back end has a pair of spaced spring fingers (129) extending substantially horizontally, and then bends slightly upwardly. The latches are fastened to the housing for locating the housing in a vertical direction. The spring fingers abut against the housing for locating the housing in a horizontal direction. The stiffener reinforces the housing, and protects the housing from deformation or warpage.

Abstract: An electrical connector (1) for connecting an IC package to a printed circuit board (PCB) comprises an insulating base (10) arranged a plurality of terminals therein, a cover (11) moveable assembly on the base and a driver mechanism disposed on the insulating base and driving the cover to slide relatively to the insulating base. The driver at least comprises a hollow driver member (12) and the driver member (12) is rotated by an exterior force.

Abstract: A system and method for connecting electrical components. More specifically, a method includes positioning a first set of electrical contacts of a first device opposite from a second set of electrical contacts of a second device, and activating a mechanism configured to rotate the first set of electrical contacts between an engaged position against the second set of electrical contacts and a disengaged position offset from the second set of electrical contacts.

Abstract: An electrical connector includes a base having a number of passageways, a cover mounted to the base, a cam mounted between the base and the cover, and a protecting mechanism. The cover has a number of through holes corresponding to the passageways and is capable of slidably moveable relative to the base. The cam is able to rotate to drive the cover to move relative to the base. The protecting mechanism includes a cover plate mounted in the cover and a base element mounted in the base. The cover plate includes a planar main portion, a via hole defined in a middle thereof, and a pair of stoppers bent toward the cover to engage to restrict the cam to rotate within a certain angle.

Abstract: A socket connector is provided for securely mounting an electronic device (1000) on a printed circuit board, said socket connector comprises an insulatve base (60) and heightened perimeter walls (606) upward extending therefrom to define an inner cavity. The top surface (602) of the inner cavity comprises a plural of passageways (608) in which a plural of contacts (70) hold. Furthermore, there are a plural of standoffs (610) between the adjacent passageways (608) co-worked with the heightened perimeter walls (606) for effectively preventing a cover (90) from deformation.

Abstract: A socket connector configured such that elongated guide holes are formed in the housing so as to receive guide members of a device to be connected, and a slide member is attached to the housing to be slidable in the longitudinal direction of the elongated guide holes so as to restrict the guide members to their initial positions. The socket enables direct placement of the device on the housing, can shorten the projection length of projection terminals of the device, can facilitate positioning of the device to thereby enhance the easiness of attachment operation, can prevent bending of the projection terminals, can cope with an increase in density of the projection terminals, and has a simple structure.

Abstract: A socket, for electrically connecting an IC package and a printed circuit board, comprises a base received with a plurality of contacts, a stiffener surrounding the base and bolts mounting the socket to the printed circuit board. The stiffener has a horizontal plate, which has engaging holes by drawing, so the engaging hole has a sidewall extending beyond the horizontal plate to keep the bolt in the engaging hole of the stiffener.

Abstract: An electrical connector (1) of the present invention includes an insulative base (10) defining a plurality of passageways (101) to receive a plurality of conductive terminals (19) therein, a base plate (142) retained in the insulative base, a cover (12) movably assembled on the base, a cover plate (142) retained in the cover and a cylindrical actuator (16). The base defines a through hole (1021) thereof. The base plate defines a through hole (1421) and a guiding slot (1422). The cover defines a plurality of passages (124) corresponding to the passageways of the insulative base and a through hole (123). The cover plate defines a through hole (1411) and a guiding portion (1413) sliding in the guiding slot. The cylindrical actuator is received and rotating in said through holes. At least one inner edge of the through hole of the base plate extends outwards to form an edge portion with a smooth surface thereon.

Abstract: An electrical connector includes a frame (2) is a substantially rectangular configuration and including a front portion and rear portion (22), a cover (3) moveably disposed on the frame and including a supporting portion (31) with a plurality of holes (311) defined therein, a lever (4) having a shaft portion (42) disposed on the rear portion of the frame to drive the cover to move from a first position to a second position, a base (1) disposed within the frame and under the cover and an elastic mechanism received between the base and the cover. The cover further defines a groove (33) which is used for receiving the elastic mechanism when the cover is in the second position.

Abstract: An electrical connector (1) includes a base (10) defining a number of contact-receiving passages, a number of contacts received in the contact-receiving passages of the base, a cover (11) mounted to an upper surface of the base, and an actuating mechanism (12) disposed between the base and the cover. The actuating mechanism includes a rotator (14) penetrating through the cover and a transmission element (16) connecting with the rotator, the base and the cover. The rotation of the rotator drives the rotation of the transmission element which is capable of driving the cover to slide relative to the base.