CN101741045B - Pulling device - Google Patents

Abstract

The invention relates to a drawing device for limiting the bending or extending path of a wire, which comprises a first shell and a second shell, wherein the first shell is connected with the second shell in a sliding mode. One end of the protection chain is fixed on the surface of the first shell. After the protection chain is extended and folded back, the other end of the protection chain is fixed on the second shell. The protection chain has a hollow portion for receiving the electric wire. The spring is fixed on the surface of the first shell and can abut against the protection chain and exert elastic restoring force of the protection chain towards the surface. During the contraction process of the protection chain, the part of the protection chain abutted by the spring is close to or close to the surface, and the rest part of the protection chain is dragged to contract, so that the bending or extending path of the wire is limited.

Description

Pulling device

technical field

The invention relates to a carrying structure of an electronic device, and in particular to a device for protecting and storing electric wires.

Background technique

Generally speaking, multiple electronic devices such as hard disks, optical drives, processors or fans are usually loaded in a large computer. In order to facilitate assembly, a connector is usually installed at the installation position of the machine, and the connector is electrically connected to the power supply, and the electronic device can obtain power after being connected to the connector. On the other hand, the electronic device can also be electrically connected to the circuit board in the machine through the connector.

At present, most common machines adopt a hot-swap design structure, which means that the connection between the connector and the power supply adopts a re-swappable design. Taking a rack server as an example, the machine platform of the rack server has a casing and a cabinet like a drawer, and the cabinet is equipped with connectors. In the hot-swappable design, when the box is pulled out of the case, the connection between the connector and the power supply is immediately separated, so the electronic power supply and connection are also interrupted.

However, sometimes the user pulls out the box just to check whether the electronic device is working normally, not to disassemble the electronic device. Every time the box is pulled out, the connection of the electronic device is interrupted, which not only interrupts the calculation and processing action, delays the calculation time, but also damages the electronic device due to repeated power cuts.

To solve the above problems, the most intuitive way is to connect the connector to the power supply or the circuit board with bendable wires. Since the wires can be stretched by straightening or shortened by bending, the connection between the connector and the power supply or the circuit board will not be separated when the box is drawn out, so that the power supply and connection of the electronic device will not be interrupted.

The length of the wires must allow the entire box to be pulled completely out of the enclosure. Due to the long length of the wires, when the box is pushed into the case, the way and position of the wires cannot be folded as expected, and sometimes the box may be stuck so that the box cannot be pushed into the case, or Crush into surrounding electronic components, or tangle with other wires.

In view of this, there is a need for a pulling device and its wire protection device, which can be used to limit the travel of wires such as electric wires, so that the wires can only be straightened in a predetermined way or folded in a predetermined position.

Contents of the invention

On the one hand, the technical problem to be solved by the present invention is to provide a pulling device, which is used to limit the bending or elongation of the wire, and confine the wire to a specific position.

Another aspect of the technical problem to be solved by the present invention is to provide a puller, which can be used to store electronic devices and wires connected to the electronic devices, and can restrict the wires to be folded in a predetermined manner.

In order to achieve the above object, the present invention provides a pulling device, which has a first housing, a second housing, a protection chain and a spring. The second housing is slidably connected to the first housing. One end of the protection chain is fixed on the surface of the first casing, and after the protection chain is extended and folded back, the other end of the protection chain is fixed on the second casing. The protective chain has a hollow part, which can be used to accommodate at least one electric wire.

The spring is fixed on the surface of the first casing. The spring abuts the guard chain and exerts an elastic restoring force of the guard chain towards the surface. In other words, the spring will act against the belay chain, causing the belay chain to move towards or against the surface.

Through the elastic restoring force of the spring, during the contraction process of the protection chain, the part of the protection chain abutted by the spring will be close to or even stick to the surface of the first casing, and the rest of the protection chain will be pulled and contracted.

In order to achieve the above purpose, the present invention further provides a drawing device, which has a first shell and a second shell. The second casing slides relative to the first casing through the slide rail. The protection chain connects the first housing and the second housing.

The protective chain contains multiple forward chain monomers and multiple reverse chain monomers. The forward chain monomers are linked together to form at least one forward segment. Wherein, each forward chain monomer can only rotate within a specific angle relative to the linked forward chain monomers, so that the forward segment composed of multiple forward chain monomers can only be deflected in the forward direction. In other words, the angle between any two forward chain monomers will be limited within the range of 0° to 180°.

The reverse chain monomers are interconnected to form an extension segment and at least one reverse segment. Each reverse chain monomer can only rotate within a specific angle relative to the linked reverse chain monomers, so that the reverse segment composed of multiple reverse chain monomers can only deflect in the reverse direction. Wherein, the angle between any two reverse chain monomers will be limited within the range of 180 degrees to 360 degrees.

In an embodiment of the present invention, a forward segment, a reverse segment and an extension segment are linked. One end of the extension section is fixed on the surface of the first casing, the other end of the extension section is connected to one end of the forward section, the other end of the forward section is connected to one end of the reverse section, and the other end of the reverse section is fixed on the second shell physically.

On the other hand, in another embodiment of the present invention, a plurality of forward segments, a plurality of reverse segments and an extension segment are linked. Wherein, one end of the extension section is fixed on the first casing, and the other end of the extension section is connected to one end of a forward section after being folded back. The forward section and the reverse section are connected alternately, and one end of the last reverse section or the forward section is fixed on the junction box.

The drawer also includes a spring. The spring is arranged on the surface of the first housing and abuts against the extension of the protection chain. The spring exerts an elastic restoring force on the extension section toward the surface of the first casing, so that the extension section can move toward the surface or can abut against the surface.

It can be seen that, when the second housing slides toward the first housing along the slide rail, the second housing will push the protection chain to bend. Due to the arrangement of forward chain monomers and reverse chain monomers on the protection chain, the protection chain is folded back and forth in a zigzag shape due to the bending of the forward segment and the reverse segment during the bending and folding process. Furthermore, the protective chain is affected by the elastic restoring force of the spring, and during the folding process, part of its extended section will be as close as possible or even attached to the surface of the first housing, without disturbing the remaining extended sections, forward sections and reverse directions. At the same time, it can also pull the entire protection chain to fold along the predetermined path.

It can be known from the above embodiments that the electric wires can be protected from being collided or damaged by using the protective chain to store the electric wires. Through the cooperation of the spring and the protection chain, the freedom of wire folding can be limited, so that the wire can only be folded according to the predetermined bending direction of the protection chain, so as to prevent the wire from being stuck in the two housings, or squeezing the surrounding electronic devices, or interacting with the Other problems such as wire entanglement.

Description of drawings

In order to make the above and other objects, features, advantages and embodiments of the present invention more comprehensible, the detailed description of the accompanying drawings is as follows:

Fig. 1A is a perspective view of a drawing device according to an embodiment of the present invention;

Fig. 1B is a perspective view of the drawing device shown in Fig. 1A;

Fig. 2 is an enlarged perspective view of a protective chain according to an embodiment of the present invention;

3A is a perspective view of a protection chain according to another embodiment of the present invention;

Fig. 3B is an enlarged perspective view of the forward segment in the protection chain shown in Fig. 3A, showing the state when the forward segment is stretched;

Fig. 3C is a side view of the forward segment shown in Fig. 3B, showing the state of the forward segment after being bent;

Fig. 3D is an enlarged perspective view of the reverse segment in the protection chain shown in Fig. 3A, showing the state when the reverse segment is stretched;

FIG. 3E is a side view of the reverse segment shown in FIG. 3D , showing the state after the reverse segment is bent.

[Description of main component symbols]

10: Electronic device 12: Wire

100: Pulling device 110: First housing

112: slide rail 114: surface

120: Second housing 130: Protection chain

132: Hollow part 140: Spring

142: Arm 144: Arm

146: Bending part 150: Chain single body

152: Through hole 154: Hole

156: Shaft 160: Forward chain monomer

162: stop piece

170: Reverse chain monomer 180: Forward segment

182: Reverse section 184: Extended section

200: clockwise 210: counterclockwise

a1: the first included angle a2: the second included angle

Detailed ways

Please refer to FIG. 1A , which is a perspective view of a pulling device 100 according to an embodiment of the present invention. The drawing device 100 basically has a structure similar to a drawer, and mainly includes a first shell 110 and a second shell 120 . The second housing 120 is slidably connected to the first housing 110 , that is, the second housing 120 can slide relative to the first housing 110 .

In an embodiment of the present invention, the second housing 120 is connected to the slide rail 112 to slide relative to the first housing 110 . The slide rail 112 can be disposed on the first housing 110 or other objects. In the embodiment of the present invention, the sliding rail 112 is fixed on the inner surface of the first housing 110 , and the outer side of the second housing 120 is connected to the sliding rail 112 . In this way, the second housing 120 can slide relative to the first housing 110 along the slide rail 112 . In addition, there are many ways that can be applied to the sliding connection between the second housing 120 and the first housing 110 , which will not be repeated here.

There is an accommodating space in the second casing 120 for accommodating the electronic device 10 . A plurality of connectors (not shown) are disposed on the second housing 120 . When the electronic device 10 is placed in the second housing 120 , the electronic device 10 can be connected with the connector. As mentioned above, the connector can be connected with external electronic components such as a power supply or a circuit board. In the embodiment of the present invention, the connector is connected to the electric wire 12 , and is connected to an external electronic component such as a power supply (not shown) through the electric wire 12 .

The pulling device 100 further has a protective chain 130 . There is a hollow portion 132 inside the protection chain 130 for accommodating the wire 12 . The protection chain 130 can protect the electric wire 12 from being damaged by being bumped or pulled when the second housing 120 is pulled, and restricts the way and position of the electric wire 12 to be extended or folded during the pulling process. In the embodiment of the present invention, the protection chain 130 is formed by connecting a plurality of chain monomers 150 , and the detailed structure and connection method will be referred to the subsequent description.

One end of the protection chain 130 is fixed on the surface 114 of the first housing 110 , and the other end of the protection chain 130 is fixed on the second housing 120 after being extended and folded back. For example, in some cases, the protective chain 130 is bent into a U-shape, and both ends of the chain are located on the same side of the bent portion.

The spring 140 is fixed on the surface 114 of the first housing 110 close to the protection chain 130 . The spring 140 can be used to abut against the protection chain 130, and apply an elastic restoring force of the protection chain 130 towards the surface 114 of the first housing 110, so that the part of the protection chain 130 abutted by the spring 140 will move towards the surface 114, even A portion of the protective chain 130 is made to rest against or against the surface 114 .

In an embodiment of the present invention, spring 140 is a torsion spring having two arms 142 and 144 connected to bend 146 . When the angle between the arm 142 and the arm 144 is changed, the degree of bending of the bending portion 146 is changed, so that the bending portion 146 generates an elastic restoring force and transmits it to the two arms 142 and 144 .

In the embodiment of the present invention, the two arms 142 and 144 connect the protection chain 130 and the first housing 110 respectively. Specifically, the curved portion 146 of the spring 140 is fixed on the surface 114 of the first housing 110 , the arm 144 abuts against the surface 114 , and the arm 142 abuts against the protection chain 130 .

Please refer to FIG. 1A and FIG. 1B at the same time. 1A and FIG. 1B are perspective views of the drawing device 100 , respectively showing the situation before and after the second housing 120 slides relative to the first housing 110 .

As mentioned above, the second housing 120 can slide relative to the first housing 110 along the slide rail 112, so that the user can pull the second housing 120 away from the first housing 110, or pull the second housing 120 away from the first housing 110. The body 120 is pushed into the first casing 110 .

When the second housing 120 is pulled out, the second housing 120 will drive one end of the protection chain 130 to move together. Since the other end of the protection chain 130 is fixed on the first housing 110, the protection chain 130 will not translate together as a whole, but each chain monomer 150 rotates so that the shape of the protection chain 130 changes, and then the protection chain 130 elongation, as shown in Figure 1B.

During the elongation process of the protection chain 130, the part of the protection chain 130 abutting against the arm 142 may move away from the surface 114 of the first housing 110, so that the angle between the two arms 142 and 144 changes, thereby causing the spring 140 to produce elastic recovery. force. The elastic recovery force is exerted on the protection chain 130 through the arm 142 , and the direction of the elastic recovery force is toward the surface 114 of the first casing 110 .

On the other hand, when the second housing 120 moves toward the first housing 110 along the slide rail 112 , the second housing 120 drives one end of the protection chain 130 to move. As mentioned above, the protective chain 130 as a whole does not translate together, but bends to shrink its length. As shown in Figure 1A.

During the shrinking process, under the action of the elastic restoring force of the spring 140 , the arm 142 first pushes the protection chain 130 to move toward the surface 114 of the first housing 110 , so that a part of the protection chain 130 fits on the surface 114 . The rest of the protection chains 130 are pulled to bend and shrink. It can be seen that, through the setting of the spring 140 , the folding sequence of the protection chain 130 can be limited, and further the folding path of the protection chain 130 can be limited.

The elastic recovery force of the spring 140 is related to the angle between the two arms 142 and 144 , and the angle between the two arms 142 and 144 is related to the degree of folding or stretching of the protective chain 130 . In an embodiment of the present invention, when the spring 140 is attached to the surface 114 against the protective chain 130, the spring 140 has a relatively small elastic restoring force, as shown in FIG. 1A . When the protection chain 130 stretches away from the surface 114 and drives the arm 142 away from the surface 114 , the spring 140 has a relatively large elastic restoring force, as shown in FIG. 1B . In an embodiment of the present invention, the elastic restoring force of the spring 140 is between 0 Newton and 4 Newton.

As mentioned above, the protection chain 130 is composed of chain monomers 150 connected to each other. The upper limit of the elastic recovery force is limited by the link force between the chain monomers 150 . In detail, when the second casing 120 is pulled out, the protection chain 130 is pulled by the pulling force, and drives each chain unit 150 to rotate, thereby making the entire protection chain 130 lengthen. Wherein, the chain monomer 150 abutted by the arm 142 is pulled away from the surface 114 by the chain monomer 150 to which it is connected, and is also subjected to the elastic restoration force applied by the spring 140 toward the surface 114 . If the elastic recovery force is too strong, the chain unit 150 abutted by the arm 142 will be disconnected from the chain unit 150 connected thereto. In the embodiment of the present invention, the upper limit of the elastic restoring force of the spring 140 is between 3 Newton and 4 Newton, preferably between 3 Newton and 3.5 Newton.

Please refer to Figure 1A and Figure 2 at the same time. FIG. 2 is an enlarged perspective view of a protective chain 130 according to an embodiment of the present invention. The protection chain 130 is basically composed of a plurality of chain monomers 150 connected to each other.

In an embodiment of the present invention, each chain monomer 150 has a through hole 152, a hole 154 for linking is provided at one opening of the through hole 152, and a connecting hole 154 is provided at the other opening of the through hole 152. Fitting shaft 156 . By fitting the hole 154 of one chain monomer 150 into the shaft 156 of the other chain monomer 150 , the two chain monomers 150 are linked together.

Please note that there are many types of the protection chain 130 and its chain monomer 150 , and the linking methods are also different. Although a form of the chain monomer 150 is provided here as an illustration, the form of the chain monomer 150 is not limited.

The linked chain monomers 150 are rotatable relative to the linked chain monomers 150 . Specifically, the chain unit 150 can rotate at a predetermined angle around its own axis 156 . Through different designs, the rotatable angle range of the chain monomer 150 is also different. Please refer to the follow-up description for the detailed structure and the limitation of the rotation angle.

The through holes 152 of the chain monomers 150 are opposed to the through holes 152 of the connected chain monomers 150 to form the hollow portion 132 . Specifically, when the chain monomers 150 are connected to each other, the through holes 152 are opposite to each other, and then connected in series to form a hollow part 132 like a tube. The hollow portion 132 can be used to accommodate a wire such as the wire 12 .

In an embodiment of the present invention, the wire 12 is accommodated in the hollow portion 132 . In detail, the wire 12 passes through the hollow portion 132 of the entire protection chain 130, and one end of the wire 12 passes through one end of the protection chain 130 fixed on the first housing 110 to connect to an external electronic component such as a power supply or circuit board. The other end of the wire 12 passes through the other end of the protection chain 130 fixed on the second housing 120 to be connected to a connector (not shown) on the second housing 120 .

In an embodiment of the present invention, the chain monomer 150 of the protection chain 130 is a bidirectionally rotatable chain monomer 150, which means that the chain monomer 150 can rotate clockwise 200 or counterclockwise. 210 turns. In another embodiment of the present invention, the protective chain 130 can also be formed by a single link that can only rotate in one direction. The details are as follows.

Please refer to FIG. 3A to FIG. 3C at the same time. Fig. 3A is a perspective view of a protection chain 130 according to an embodiment of the present invention, Fig. 3B is an enlarged perspective view of a part of the forward section 180 of the protection chain 130 shown in Fig. 3A, and Fig. 3C is a side view of a part of the protection chain 130 shown in Fig. 3B view.

The protection chain 130 has a plurality of forward chain monomers 160 interconnected to form a forward segment 180 . Wherein, each forward chain unit 160 can rotate relative to the other connected forward chain unit 160 around the center point of the shaft 156 and the hole 154 , and the rotation is limited in angle.

The first included angle a1 between each forward chain monomer 160 relative to the forward chain monomer 160 connected below it is limited between 0° and 180°. In detail, the forward chain monomer 160a is linked with the shaft 156 provided thereon to the hole 154 of the forward chain monomer 160b. Furthermore, with the link axis 156 as the center, the included angle between the forward chain monomer 160a and the forward chain monomer 160b is a first included angle a1. Relative to the forward chain monomer 160b, the forward chain monomer 160a is restricted to freely rotate in the clockwise direction 200 or the counterclockwise direction 210 within a specific range of the first included angle a1 between 0° and 180°. In short, the first included angle a1 of the deflected forward chain monomer 160a relative to the linked forward chain monomer 160b is limited to be between 0° and 180°.

Depending on the structural design of the forward chain monomer 160 , the range of the first included angle a1 can vary. For example, the first included angle a1 may be between 120 degrees and 180 degrees. In an embodiment of the present invention, the first included angle a1 is less than 180 degrees and greater than 90 degrees. Please note that the first included angle a1 is represented by a vector angle. Therefore, the forward segment 180 formed by the entire forward chain monomer 160 can only deflect in the clockwise direction 200 , but cannot deflect in the opposite direction.

The above purpose of enabling the forward chain monomer 160 to rotate between the first included angles a1 can be achieved by providing a stopper assembly on the forward chain monomer 160 to prevent reverse deflection. Those with ordinary knowledge in the technical field of the present invention should be familiar with various possible structures to achieve the limitation of one-way rotation, and details will not be repeated here.

In an embodiment of the present invention, stoppers 164 and stoppers 162 are respectively provided at two open ends of the through hole 152 of the forward chain monomer 160 . The stopper 164 is like a protrusion. When the chain unit 160 rotates in the forward direction, the stopper 164 will resist the stopper 162 so that the chain unit 160 in the forward direction can only rotate within a set angle.

On the other hand, as mentioned above, the through holes 152 of the forward chain monomers 160 are opposite to each other, so that the through holes 152 of each forward chain monomer 160 after being linked can form the hollow portion 132 .

Please refer to FIG. 3A , FIG. 3D and FIG. 3E . FIG. 3D is an enlarged perspective view of a part of the reverse segment 182 of the protective chain 130 shown in FIG. 3A , and FIG. 3E is a side view of the protective chain 130 shown in FIG. 3D .

In the embodiment of the present invention, the protection chain 130 also has a reverse segment 182 formed by connecting multiple reverse chain monomers 170 to each other. Like the forward chain monomer 160 of the forward segment 180 , each reverse chain monomer 170 is linked by its axis 156 to the aperture 154 of the other reverse chain monomer 170 . And taking the link axis 156 as the center, the included angle between the two reverse chain monomers 170 is the second included angle a2.

In detail, the second included angle a2 between the reverse chain monomer 170a and the linked reverse chain monomer 170b is limited between 180 degrees and 360 degrees. That is to say, the deflected reverse chain unit 170a can rotate relative to the linked reverse chain unit 170b within the range of the second included angle a2 limited to 180 degrees to 360 degrees.

In addition, according to different structural designs of the reverse chain monomer 170 , the range of the second included angle a2 can vary. For example, the second included angle a2 may be between 180 degrees and 300 degrees. In an embodiment of the present invention, the second included angle a2 is less than 270 degrees and greater than 180 degrees. Please note that the second included angle a2 is expressed as a vector angle. Therefore, the reverse segment 182 formed by the entire reverse chain monomer 170 can only deflect in the counterclockwise direction 210 , but cannot deflect in the reverse direction.

As mentioned above, in order to enable the reverse chain unit 170 to rotate between the second included angle a2, the reverse chain unit 170 is also provided with a stopper 164 and a stopper 162 that block forward deflection. Specifically, the stopper 164 and the stopper 162 are respectively disposed at two open ends of the through hole 152 of the reverse chain unit 170 . The stopper 164 is like a bump. When the reverse chain unit 170 rotates, the stopper 164 will resist the stopper 162 so that the reverse chain unit 170 can only rotate within a set angle.

On the other hand, as mentioned above, the through-holes 152 of the reverse chain monomers 170 are opposite to each other, so that the through-holes 152 of each reverse chain monomer 170 after linking can form the hollow portion 132 .

Please refer to Figure 1A and Figure 3A. In the protective chain 130, there are multiple forward segments 180 and multiple reverse segments 182 arranged in a staggered manner. In this way, when the second housing 120 slides toward the first housing 110 , the protection chain 130 is pushed and bends and shrinks. Since the forward segment 180 can only be bent clockwise and the reverse segment 182 can only be bent counterclockwise, the staggered forward segment 180 and reverse segment 182 can be folded back and forth in a zigzag manner.

In the embodiment of the present invention, the protective chain 130 is also provided with an extension section 184, which can be used to extend the total length of the protective chain 130 after the extension, and also adjust the wiring holes according to the designer's design requirements. The extension section 184 can be composed of a single body that can rotate in both directions or only in one direction. The two-way rotatable monomer chain monomer 150 shown in Figure 2 and the chain monomer 160 shown in Figure 3B and Figure 3C and the reverse direction shown in Figure 3D and Figure 3E can only be rotated in one direction The chain monomers 170 have been described in detail in the above-mentioned articles, and will not be repeated here. In the embodiment of the present invention, the extension section 184 is formed by connecting multiple reverse chain monomers 170 to each other.

When the extension section 184, the forward section 180 and the reverse section 182 are connected, all the through holes (not shown) of the forward chain monomer 160 and the reverse chain monomer 170 will also be opposite and connected in series to form a hollow part 132 for power supply lines 12 is housed in it.

One end of the extension section 184 is fixed on the surface 114 of the first casing 110 , and the other end is connected to one end of the forward section 180 . As mentioned above, forward segments 180 and reverse segments 182 are interleaved and linked.

According to the wiring position of the second housing 120 and the length of the overall protective chain 130 , the last section of the protective chain 130 can be the reverse section 182 or the forward section 180 . In the embodiment of the present invention, one end of the extension section 184 is fixed on the first casing 110 . The last section of the protective chain 130 is a reverse section 182 , and one end of the reverse section 182 is fixed on the second casing 120 , and the other end of the reverse section 182 is connected to the forward section 180 .

It can be seen from the above-mentioned embodiments that the pulling device 100 disclosed in the present invention stores the electric wires 12 in the protective chain 130, which not only protects the electric wires 12 from external collisions or pulling during the pulling process, but also limits the protection of the chains. The degree of freedom of the bending and folding angle of the 130 enables the electric wire 12 to be folded only according to the predetermined bending direction of the protection chain 130 .

Then use the spring 140 to abut part of the protection chain 130 toward the surface 114 of the first housing 110 or make part of the protection chain 130 against the surface 114, which can effectively pull the other part of the protection chain 130 to be smoothly folded between the two housings. In this way, problems such as the electric wire 12 being stuck on the second casing 120 and the first casing 110 , being squeezed to peripheral electronic devices, or being entangled with other wires can be avoided.

Although the present invention has been disclosed as above with a number of embodiments, it is not intended to limit the present invention. Any person familiar with the art may make various modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims (10)

1. A pulling device, characterized in that it comprises: a first shell having a surface; a second housing, slidably connected to the first housing; a protective chain, which has a hollow part inside to accommodate at least one electric wire, one end of the protective chain is fixed on the surface, and after the protective chain is stretched and folded, the other end is fixed to the second housing; and A spring is fixed on the surface, abuts against the protection chain, and exerts an elastic recovery force of the protection chain towards the surface. 2 . The drawing device according to claim 1 , wherein the spring abuts part of the protection chain, so that part of the protection chain adheres to the surface. 3. The drawing device according to claim 1, wherein the elastic restoring force is between 0 Newton and 4 Newton. 4. The drawing device according to claim 3, wherein the upper limit of the elastic restoring force is between 3 Newton and 3.5 Newton. 5. The pulling device according to claim 1, wherein the protective chain comprises a plurality of interlinked two-way chain monomers. 6. The pulling device according to claim 1, characterized in that, the protective chain comprises a plurality of forward segments and a plurality of reverse segments staggered, wherein each of the forward segments has a plurality of forward chains linked to each other monomers, the angle between each forward chain monomer relative to the linked forward chain monomer is limited to between 0 degrees and 180 degrees, and each of the reverse segments has a plurality of reverse chains linked to each other monomers, the included angle of each reverse chain monomer relative to the connected reverse chain monomer is limited to be between 180 degrees and 360 degrees. 7. A pulling device, characterized in that it at least comprises: a first shell having a surface; a second casing, which slides relative to the first casing through a slide rail; A protective chain, including: A plurality of forward chain monomers are interconnected to form at least one forward segment, wherein the angle between each forward chain monomer relative to the linked forward chain monomer is limited to between 0° and 180°; as well as A plurality of reverse chain monomers are linked together to form an extension section and at least one reverse section, one end of the extension section is fixed on the surface, and the extension section is folded back and connected to one end of the forward section with the other end, the reverse section One end of the reverse chain is fixed to the second housing and the other end of the reverse segment is connected to the other end of the forward segment, wherein the angle between each reverse chain monomer relative to the linked reverse chain monomer is limited to 180 degrees to between 360 degrees; and a spring, fixed to the surface and abutting against the extension, and the spring exerts an elastic restoring force on the extension toward the surface, Wherein when the second casing moves toward the first casing, the forward section and the reverse section are folded back and forth between the first casing and the second casing in a zigzag shape. 8. The pulling device according to claim 7, characterized in that, the forward chain monomers and the reverse chain monomers are individually connected with a through hole, and the forward chain monomers and the reverse chains The through holes of the monomer are opposed to form a hollow part for accommodating at least one wire. 9. The drawing device according to claim 7, wherein the elastic restoring force is between 0 Newton and 4 Newton. 10. The drawing device according to claim 9, wherein the upper limit of the elastic restoring force is between 3 Newton and 3.5 Newton.

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