CN201489816U - Retractable USB flash drive - Google Patents

Abstract

A telescopic USB flash drive is characterized in that a metal shell formed by drawing out a seamless square tube is internally provided with an insulating seat capable of sliding relatively, and a printed circuit board is arranged in the insulating seat. A sliding groove is arranged on one surface of the metal shell, and at least a first positioning hole and a second positioning hole are arranged on the sliding groove; the insulating seat forms a sliding block relative to the sliding groove of the metal shell, and the sliding block is arranged on a spring sheet to press and extend into the sliding groove; meanwhile, the sliding block is provided with a clamping block, so that the sliding block can be selectively positioned in the first positioning hole or the second positioning hole. When the sliding block is positioned in the first positioning hole, the insulating base and the printed circuit board are contracted in the metal shell; when the sliding block is positioned in the second positioning hole, the front section of the insulating seat and the USB interface circuit extend out of the front opening of the metal shell. Therefore, the manufacturing cost is greatly reduced, and the device is not easy to damage; at the same time, the assembly work becomes very simple and fast.

Description

Retractable USB flash drive

technical field

The utility model relates to a structure of a USB flash drive, in particular to a retractable USB flash drive.

Background technique

A USB flash drive (U disk) is a mobile storage device that can be connected to a computer to access data for easy portability. Moreover, due to the continuous advancement of technology, the capacity of the current USB flash drive is constantly expanding, and its application range is also becoming wider and wider.

At present, there is a retractable USB flash drive design on the market, which mainly assembles a printed circuit board with a USB interface circuit and an integrated package circuit with a memory function on an insulating seat, and then uses two The insulating shell covers the insulating seat, and a pusher device is designed on the insulating seat to protrude out of the insulating shell, so that the pusher device can be operated so that the USB interface circuit can be used outside the insulating shell or shrunk into the insulating shell.

In the previous case of US Patent 6,932,629 "Device with USB terminal", the disclosed structure is a device body with a USB terminal and a cover that at least covers the USB terminal. The combination of the device body and the cover allows the cover and the device body to be extended or compressed relative to each other, so that the USB terminal is inserted into the cover, or the USB terminal is exposed through relative rotation.

In the previous cases of U.S. Patents 6,979,210 and 7,462,044 "Thumb drive with retractable USB connector", the disclosed thumb device has an on-board memory for storing digital data, a A male USB connector connects the on-board memory to a computer-applied USB port, and an extend/retract mechanism enables the connector to extend out of an opening in the device and retract when not in use. Fig. 2 of the two cases discloses its feasible embodiment, and it is necessary to form the shell with two separate parts 213 and 214, so that the extension/contraction mechanism and the memory can be combined.

As another example, in the previous case of US Patent Publication 20080233776 "RETRACTABLE MEMORYDRIVE", a retractable memory device is disclosed, which includes a top case, an intermediate carrier, and an electronic device such as a USB thumb device , and a bottom shell. It also uses the top shell and the bottom shell to form the shell part.

In addition, refer to the exploded view of a simple and known retractable USB flash drive shown in FIG. 20 . In this figure, there is a housing 91 with a slideway 92 , and a T-shaped slider 94 on the circuit board 93 , which can be buckled into the first and second positioning holes 911 , 912 . The T-shaped slider 94 can be pushed and selectively buckled into the first or second positioning hole 911 or 912 on the slideway 92 to control the USB interface circuit at the front of the printed circuit board to protrude or retract into the metal casing 91 . Although this structure is different from the traditional top case and bottom case structure, it is easy to assemble. However, since the circuit board 93 is not blocked from moving in the casing 91, the circuit board 93 is easy to fall off, which needs to be improved.

In addition, these known structures will make the assembly of the entire USB flash drive very inconvenient and time-consuming, and will also greatly increase the manufacturing cost, which really needs to be improved.

Contents of the invention

The purpose of the utility model is to provide a retractable USB flash drive, to overcome the defects of the above-mentioned traditional structure, to reduce the manufacturing cost by drawing out the formed seamless square tube metal shell, and it is not easy to damage; at the same time, through the integrally formed The metal casing is no longer required to be assembled in two pieces as in the previous case, making the assembly work simple and fast.

According to the above object, a retractable USB flash drive is characterized in that it comprises:

A metal shell made of drawn-out seamless square tubes has a front opening and a rear opening, and a chute is opened on one of the surfaces; the chute has at least a first positioning hole and a second positioning hole;

A printed circuit board with at least one USB interface circuit and an integrated packaged circuit with memory function, the USB interface circuit is arranged in front of the integrated packaged circuit; and

An insulating seat, slidably arranged in the metal shell, has at least a body part and a front part, the shape of the front part is the same as that of a standard USB plug, and a hole is formed inwardly from the bottom surface to hold the printed circuit board The recessed space, and relative to the chute position of the metal shell forms a slider, which is arranged on a shrapnel and pressed into the chute; on the slider there is a The clamping block interfering with the positioning holes, the slider can be selectively positioned in the first positioning hole or the second positioning hole; Shrunk in the metal shell; the slider is positioned at the state of the second positioning hole, the front section of the insulating seat and the USB interface circuit of the printed circuit board protrude from the front opening of the metal shell.

Wherein, the chute is arranged on the top surface of the metal casing.

Wherein, the elastic piece is integrally formed and bridged on the insulating seat.

Wherein, the surface of the slider protruding from the chute is three connected circular arc surfaces.

Wherein, one side of the metal shell is provided with a through hole at the rear opening, and the insulating seat forms a cutaway relative to the position of the through hole.

Wherein, the chute of the metal shell is further provided with a third positioning hole; the rear end of the main body of the insulating seat forms a hook with a gap; when the slider is positioned in the third positioning hole, the insulating seat The main body and the front part of the hook are shrunk in the metal shell, and the notch of the hook protrudes from the rear opening of the metal shell.

A retractable USB flash drive, characterized in that it comprises:

A metal shell made of drawn-out seamless square tubes has a front opening and a rear opening, and a chute is opened on one of the surfaces; the chute has at least a first positioning hole and a second positioning hole;

A printed circuit board with at least one USB interface circuit and an integrated packaged circuit with memory function, the USB interface circuit is arranged in front of the integrated packaged circuit; and

A metal seat, slidably arranged in the metal shell, at least has a body part and a front part, the shape of the front part is the same as that of a standard USB plug, and a hole is formed inwardly from the bottom surface for adhering and accommodating the printed circuit board Recessed space, and relative to the position of the chute of the metal shell, a slider is formed, the slider is arranged on a shrapnel and pressed into the chute; on the slider there is a positioning hole corresponding to the first or second positioning hole The interfering clamping block, the slider can be selectively positioned in the first positioning hole or the second positioning hole; when the slider is positioned in the first positioning hole, the body part and the front part of the insulating seat shrink in the In the metal casing; when the slider is positioned at the second positioning hole, the front section of the insulating seat and the USB interface circuit of the printed circuit board protrude from the front opening of the metal casing; wherein the shrapnel on the metal seat is A separate structure, its front and rear ends have flanges buckled into a pair of grooves on the insulating base.

A retractable USB flash drive, characterized in that it comprises:

A metal shell made of drawn-out seamless square tubes has a front opening and a rear opening, and a chute is opened on one side thereof; the chute has at least a first positioning hole and a second positioning hole;

A printed circuit board, at least having a USB interface circuit and an integrated packaging circuit with memory function, the USB interface circuit is arranged in front of the integrated packaging circuit and covered with a metal shield;

an insulating front section, fixedly arranged in the front opening of the metal casing, having an opening for the USB interface circuit and the metal shield to pass through; and

An insulating rear part is slidably arranged in the metal shell, and the insulating rear part forms a recessed space from the bottom surface inwardly to accommodate the printed circuit board integrated package circuit, and is opposite to the metal shell The position of the chute forms a slider, which is arranged on an elastic piece and pressed into the chute; on the slider, there is a clamping block that interferes with the first or second positioning hole, and the slider Can be selectively positioned in the first positioning hole or the second positioning hole;

When the slider is positioned in the first positioning hole state, the insulating back section and the printed circuit board are shrunk in the metal casing; when the slider is positioned in the second positioning hole state, the insulating rear section slides forward Move, the USB interface circuit and the metal shielding cover of the printed circuit board protrude from the front opening of the metal casing.

Wherein, a buckle groove is provided on both sides of the integrated package circuit close to the rear edge, and two hook bodies for fixing the printed circuit board are extended at the end of the recessed space of the insulating back section, and the hook bodies are respectively buckled. into the buckle slot.

Wherein, a buckle block is respectively formed on both sides of the insulating front part, and a buckle hole is respectively formed on the two sides of the metal shell opposite to the buckle block, and the buckle block is buckled into the buckle hole.

Wherein, a positioning block is respectively formed on the front edges of both sides of the insulating front section, and a cutout is respectively formed on the two sides of the metal shell relative to the position of the positioning block, and the positioning block is inserted into the cutout.

Among them, the printed circuit board is composed of multiple ICs with memory function, and the front end is a traditional USB plug.

In the telescopic USB flash drive provided by the utility model, since the metal shell is a seamless square tube formed by extraction, the manufacturing cost is greatly reduced, and it is not easy to be damaged; at the same time, because the metal shell is integrally formed, It is no longer necessary to assemble with two pieces as in the previous case, so the assembly work becomes very simple and fast.

In the retractable USB flash drive provided by the utility model, a through hole is opened on one side of the metal casing close to the rear opening, and the insulating seat forms a missing corner relative to the through hole; the through hole can be used to Attach other items such as chains or carry reels etc.

Hereinafter, the structural features and usage effects of the present utility model will be described in detail according to the embodiments shown in the drawings.

Description of drawings

Fig. 1 shows the exploded view of the utility model first kind of embodiment,

Fig. 2 shows another perspective exploded view of the first embodiment of the utility model,

Fig. 3 shows the combination diagram of the first embodiment of the utility model,

Fig. 4 shows the combination diagram of the first embodiment of the present utility model, but the USB interface circuit and the front part extend out of the metal shell,

Fig. 5 shows the top view of the first embodiment of the utility model,

Figure 6 shows a sectional view along AA in Figure 5 and a schematic view of the action,

Fig. 7 shows the exploded view of the second embodiment of the utility model,

Fig. 8 shows the exploded view of another angle printed circuit board and insulating seat of the second embodiment of the utility model,

Fig. 9 shows the combined diagram of the second embodiment of the utility model,

Fig. 10 shows the combination diagram of the second embodiment of the present invention, but the USB interface circuit and the front part extend out of the metal shell,

Fig. 11 shows the combination diagram of the second embodiment of the present invention, but the hook body stretches out of the metal shell,

Fig. 12 shows the exploded view of the third embodiment of the utility model,

Fig. 13 shows the combination diagram of the third embodiment of the present utility model,

Fig. 14 shows the combination diagram of the third embodiment of the present invention, but the USB interface circuit and the metal shield extend out of the metal shell,

Fig. 15 shows the sectional view of the third embodiment of the utility model,

Fig. 16 shows the exploded view of the fourth embodiment of the utility model,

Fig. 17 shows the combined diagram of the fourth embodiment of the utility model,

Fig. 18 shows the exploded view of the fifth embodiment of the utility model,

Fig. 19 shows the composite diagram of the fifth embodiment of the present utility model,

Fig. 20 shows an exploded view of a known retractable USB flash drive.

Detailed ways

Please refer to FIG. 1 to FIG. 3 , which are the first embodiment of a retractable USB flash drive of the present invention, which is composed of a metal shell 11 , a printed circuit board 12 and an insulating seat 13 .

The metal shell 11 is a seamless square tube that is drawn out and has a front opening 111 and a rear opening 112, and a chute 113 is opened on the top surface; the chute 113 has a first positioning hole 114 and a second positioning hole. Hole 115.

The printed circuit board 12 has a USB interface circuit 121 and an integrated packaging circuit 122 with memory function, as shown in FIG. 2 , the USB interface circuit 121 is arranged in front of the integrated packaging circuit 122 .

The insulating seat 13 is slidably arranged in the metal shell 11, and at least has a main body portion 131 and a front portion 132. The front portion 132 is the same as a standard USB plug, and forms a recessed space 133 from the bottom surface (see As shown in FIG. 2 ), the printed circuit board 12 is accommodated therein by locking. The position of the insulating base 13 relative to the sliding slot 113 of the metal shell 11 forms a sliding block 134 , and the sliding block 134 is arranged on an elastic piece 135 to press and extend into the sliding slot 113 . The sliding block 134 has a clamping block 136 that interferes with the first or second positioning hole 114 or 115 , so that the sliding block 134 can be selectively positioned in the first positioning hole 114 or the second positioning hole 115 .

The action of the present utility model can refer to Fig. 3 and Fig. 4, cooperate Fig. 5 and Fig. 6 simultaneously. Referring to FIG. 3 and FIG. 6 , when the slider 134 is positioned in the first positioning hole 114 , the body portion 131 and the front portion 132 of the insulating base 13 are shrunk inside the metal casing 11 to achieve protection when not in use. When the slider 134 is positioned in the second positioning hole 115, as shown by the dotted line in FIG. 4 and FIG. And can be inserted into the USB socket for data access applications.

During actual operation, the sliding block 134 can be pressed down to disengage the clamping block 136 from the fastening of the first or second positioning hole 114 or 115 , so that the insulating seat 13 can slide freely in the metal casing 11 . So in order to achieve the purpose of stretching.

Since the metal shell 11 of the present invention is made of a seamless square tube that is drawn out, the manufacturing cost is greatly reduced and it is not easy to be damaged. At the same time, the metal shell 11 of the present invention is integrally formed, and no longer must be assembled in two pieces as in the previous case, so the assembly work becomes very simple and fast.

In the first embodiment of the present utility model, the elastic piece 135 is integrally formed and bridged on the insulating seat 13 . At the same time, the surface of the sliding block 134 protruding from the chute 113 is three connected circular arc surfaces to increase the frictional force and facilitate the user's operation. In addition, a through hole 116 is formed on one side of the metal casing 11 close to the rear opening 112, and the insulating base 13 forms a notch 137 relative to the through hole 116; this design can use the through hole 116 to connect other items , such as chains or portable reels, etc.

Further, referring to Fig. 7 to Fig. 9, it is the second embodiment of a retractable USB flash drive of the present utility model, which is the same as the first embodiment, and it consists of a metal shell 11, a printed circuit board 12 and a Insulating seat 13 is formed. The difference is that a third positioning hole 117 is further provided on the chute 113 of the metal shell 11 , and a hook body 138 with a notch 139 is formed at the rear end of the body portion 131 of the insulating base 13 .

When the slider 134 is positioned in the first positioning hole 114, as shown in FIG. 9 , the body portion 131 and the front portion 132 of the insulating seat 13 shrink into the metal shell 11, and the gap 139 of the hook body 138 also shrinks into the metal shell 11. Inside, but the hook body 138 partially protrudes from the rear opening 112 of the metal casing 11 to form a ring.

When the slider 134 is positioned in the second positioning hole 115, referring to Fig. 10, the front section 132 of the insulating base 13 and the USB interface circuit 121 of the printed circuit board 12 protrude from the front opening 111 of the metal casing 11, and can be inserted into the USB socket. , for data access applications.

When the slider 134 is positioned in the third positioning hole 117, referring to FIG. Stretch out to hook other items conveniently, such as chains or portable reels, etc., and then return to the position shown in Figure 9.

Referring to Fig. 12 to Fig. 15, it is a third embodiment of a retractable USB flash drive of the present invention, which consists of a metal shell 31, a printed circuit board 32, an insulating front section 33 and an insulating rear section 34 constituted.

The metal shell 31 is a seamless square tube that is drawn out and formed, and has a front opening 311 and a rear opening 312, and a chute 313 is opened on one side thereof; the chute 313 has a first positioning hole 314 and a second positioning hole. Hole 315.

The printed circuit board 32 has a USB interface circuit 321 and an integrated packaging circuit 322 with memory function. The USB interface circuit 321 is arranged in front of the integrated packaging circuit 322 and covered with a metal shield 323 .

The insulating front portion 33 is fixedly disposed in the front opening 311 of the metal casing 31 and has an opening 331 for the USB interface circuit 321 and the metal shield 323 to pass through.

The insulating rear section 34 is slidably disposed in the metal casing 31, and the insulating rear section 34 forms a recessed space 341 from the bottom surface inwardly to engage and accommodate the integrated packaging circuit 322 of the printed circuit board 32 in it, and is relatively A sliding block 342 is formed at the position of the sliding slot 313 of the metal shell 31 , and the sliding block 342 is arranged on an elastic piece 343 so as to press into the sliding slot 313 . The sliding block 342 has a clamping block 344 that interferes with the first or second positioning hole 314 or 315 , so that the sliding block 342 can be selectively positioned in the first positioning hole 314 or the second positioning hole 315 .

Referring to FIG. 13 , when the slider 342 is positioned in the first positioning hole 314 , the insulating back section 34 and the printed circuit board 32 are shrunk inside the metal casing 31 . Referring to FIG. 15 , the sliding block 342 can be pressed at this time, so that the clamping block 344 can disengage from the engagement with the first positioning hole 314 , and the insulating rear section 34 can be pushed to move. Referring to FIG. 14, when the slider 342 is positioned in the second positioning hole 315, the insulating rear section 34 slides forward, so that the USB interface circuit 321 and the metal shielding cover 323 of the printed circuit board 32 protrude from the front of the metal casing 31. The opening 311 is insulated from the front portion 33 .

In this third embodiment, a buckle groove 324 is provided on both sides of the integrated package circuit 322 close to the rear edge, and two hook bodies 345 extend from the end of the recessed space 341 of the insulating rear section 34, and the hook body 345 Buckle into the buckle slots 324 to fix the printed circuit board 32 respectively, as shown in FIG. 15 .

In addition, a buckle block 332 is formed on both sides of the insulating front section 33, and a button hole 316 is formed on both sides of the metal shell 31 relative to the buckle block 332, and the buckle block 332 is buckled into the buckle hole 316 to complete the combination; at the same time A positioning block 333 is respectively formed on the front edge of both sides of the insulating front section 33 , and a cutout 317 is formed on the two sides of the metal shell 31 opposite to the positioning block 333 , and the positioning block 333 is inserted into the cutout 317 .

Referring to Fig. 16 and Fig. 17, it is a fourth embodiment of a retractable USB flash drive of the present utility model, similar to the aforementioned second embodiment, consisting of a metal shell 11, a printed circuit board 12 and a metal seat 14, the insulating seat 12 of the second embodiment is replaced by a metal seat 14, and the elastic piece 145 on the metal seat 14 is a separate structure, and its front and rear ends have flanges 1451 that snap into a pair of grooves on the metal seat 14 The body 14a can be interlocked; and the slider 144 is also formed on the elastic piece 145 . Since the metal seat 14 is made of metal material, it cannot provide the engaging force of the printed circuit board 12, so the printed circuit board 12 is glued and bonded in the metal seat 14, and is moved in the chute 113 of the metal shell 11 by the slider 144 Move together to achieve telescoping function.

Referring to Fig. 18 and Fig. 19, it is the fifth embodiment of a retractable USB flash drive of the present utility model, similar to the aforementioned third embodiment, it consists of a metal shell 31, a printed circuit board 32, an insulating front section part 33 and an insulating rear part 34. The difference is that the printed circuit board 32 is not an integrated package circuit with a memory function, but a circuit 325 with a traditional memory function formed by multiple ICs, and the front end is a traditional USB plug 323a, while other components and The operation is the same as that of the aforementioned third embodiment.

Claims (12)

1. the carry-on dish of telescopic USB is characterized in that, comprising:

One does not have the metal shell that the seam square tube constitutes by extracting moulding out, has an open front and after-opening, and a surface offers a chute therein; At least have one first pilot hole and one second pilot hole on this chute;

One printed circuit board (PCB), the integrated encapsulated circuit that has a usb circuit and a tool memory function at least, this usb circuit are arranged at this integrated encapsulated circuit the place ahead; And

One insulating base, be mounted slidably in this metal shell, at least have a body and a leading portion portion, this leading portion portion shape is identical with the standard USB plug, and inwardly form one from the bottom surface and accommodate the dented space of this printed circuit board (PCB) in order to engaging, and the runner position with respect to this metal shell forms a slide block, and this slide block is set on the shell fragment and compressing is stretched in this chute; Have the clamping block with this first or second pilot hole interference on this slide block, this slide block selectively is positioned first pilot hole or second pilot hole; And be positioned the first pilot hole state place in this slide block, the body of this insulating base and leading portion portion shrink in this metal shell; This slide block is positioned the second pilot hole state place, the open front that the leading portion portion of this insulating base and the usb circuit of this printed circuit board (PCB) stretch out this metal shell.

2. according to the carry-on dish of the described telescopic USB of claim 1, it is characterized in that chute is arranged at the end face of this metal shell.

3. according to the carry-on dish of the described telescopic USB of claim 2, it is characterized in that the one-body molded cross-over connection of this shell fragment is on this insulating base.

4. according to the carry-on dish of the described telescopic USB of claim 2, it is characterized in that the surface that this slide block stretches out this chute is three arc surfaces that are connected.

5. according to the carry-on dish of the described telescopic USB of claim 2, it is characterized in that an open-work is offered in this after-opening position in a side of metal shell, and this insulating base forms a unfilled corner in this open-work position relatively.

6. according to the carry-on dish of the described telescopic USB of claim 2, it is characterized in that, further be provided with one the 3rd pilot hole on this chute of metal shell; The body rear end formation one of this insulating base has the body that colludes of a breach; Be positioned the 3rd pilot hole state place in this slide block, the body of this insulating base and leading portion portion shrink in this metal shell, and this breach that colludes body stretches out from the after-opening of this metal shell.

7. the carry-on dish of telescopic USB is characterized in that, comprising:

One does not have the metal shell that the seam square tube constitutes by extracting moulding out, has an open front and after-opening, and a surface offers a chute therein; At least have one first pilot hole and one second pilot hole on this chute;

One printed circuit board (PCB), the integrated encapsulated circuit that has a usb circuit and a tool memory function at least, this usb circuit are arranged at this integrated encapsulated circuit the place ahead; And

One metal pedestal, be mounted slidably in this metal shell, at least have a body and a leading portion portion, this leading portion portion shape is identical with the standard USB plug, and inwardly form one from the bottom surface and accommodate the dented space of this printed circuit board (PCB) in order to bonding, and the runner position with respect to this metal shell forms a slide block, and this slide block is arranged on the shell fragment and compressing is stretched in this chute; Have the clamping block with this first or second pilot hole interference on this slide block, this slide block selectively is positioned first pilot hole or second pilot hole; Be positioned the first pilot hole state place in this slide block, the body of this insulating base and leading portion portion shrink in this metal shell; Be positioned the second pilot hole state place in this slide block, the open front that the leading portion portion of this insulating base and the usb circuit of this printed circuit board (PCB) stretch out this metal shell; Wherein this shell fragment on this metal pedestal is an isolating construction, and its front and back end has flange and buckles on the insulating base in a pair of cell body.

8. the carry-on dish of telescopic USB is characterized in that, comprising:

One does not have the metal shell that the seam square tube constitutes by extracting moulding out, has an open front and after-opening, offers a chute in the one side; At least have one first pilot hole and one second pilot hole on this chute;

One printed circuit board (PCB), the integrated encapsulated circuit that has a usb circuit and a tool memory function at least, this usb circuit are arranged at this integrated encapsulated circuit the place ahead, and are coated with a metal mask;

One insulation leading portion portion is fixedly set in the open front of this metal shell, has a perforate that passes for this usb circuit and metal mask; And

One insulation back segment portion, be mounted slidably in this metal shell, this insulation back segment portion inwardly forms one and accommodates the dented space of the integrated encapsulated circuit of this printed circuit board (PCB) in order to engaging from the bottom surface, and the runner position with respect to this metal shell forms a slide block, and this slide block is arranged on the shell fragment and compressing is stretched in this chute; Have the clamping block with this first or second pilot hole interference on this slide block, this slide block selectively is positioned first pilot hole or second pilot hole;

Be positioned the first pilot hole state place in this slide block, this insulation back segment portion and printed circuit board (PCB) shrink in this metal shell; Be positioned the second pilot hole state place in this slide block, this insulation back segment portion slippage forward, the open front that the usb circuit of this printed circuit board (PCB) and metal mask stretch out this metal shell.

9. according to the carry-on dish of the described telescopic USB of claim 8, it is characterized in that, integrated encapsulated circuit both side edges is offered catching groove respectively one near posterior border position, and the dented space end of this insulation back segment portion is extended with two in order to fix the hook body of this printed circuit board (PCB), and this hook body buckles in the catching groove respectively.

10. according to the carry-on dish of the described telescopic USB of claim 8, it is characterized in that insulation leading portion portion two sides form a button piece respectively, and these metal shell two sides form a button hole respectively in this button piece position relatively, this button piece buckles in this button hole.

11., it is characterized in that insulation leading portion portion two sides leading edge forms a positioning block respectively according to the carry-on dish of the described telescopic USB of claim 8, and these metal shell two sides form a kerf respectively in this locating piece position relatively, this locating piece embeds in this otch.

12. according to the carry-on dish of the described telescopic USB of claim 8, it is characterized in that printed circuit board (PCB) is made of a plurality of IC with memory function, and front end is a traditional USB plug.

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