Patent Publication Number: US-2020291689-A1

Title: Lock mechanism and holding structure for electronic device

Description:
CROSS-REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of Taiwan patent application serial no. 108108325, filed on Mar. 12, 2019. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification. 
     BACKGROUND 
     Technical Field 
     The disclosure relates to a lock mechanism and a holding structure, in particular, to a lock mechanism and a holding structure for an electronic device. 
     Description of Related Art 
     In recent years, in stores, hospitals, stations, banks, transportation vehicles or other public places, display devices are usually provided to provide audio and video information to the public. The display devices can be equipped with a virtual operation interface (such as a touch panel) or a physical operation interface (such as a keyboard or mouse) to facilitate the operation of the users, so as to obtain the information needed. Generally, the display device is mostly fastened to the machine, the wall, the frame or other carriers. Therefore, in the process of dismounting the display device, the operator has to remove the screw by hand tools or automatic tools in order to remove the display device from the machine, the wall, the frame or other carriers. On the other hand, the operator has to fasten the display device to the machine, wall, frame or other carriers by using hand tools or an automatic tool to fasten the locking screws. The above process of dismounting the display device is time consuming and inconvenient. 
     SUMMARY 
     The disclosure provides a lock mechanism which is extremely convenient in operation. 
     The disclosure provides a holding structure for an electronic device, which is extremely convenient in operation and has a good reliability. 
     A lock mechanism in one embodiment of the disclosure includes a main body, a base, a rotating component and a position limiting component. The base is slidably connected to the main body, and the main body is sleeved on the base. The rotating component is pivoted to the main body, and the rotating component is configured to drive the base to slide relative to the main body. The position limiting component is coupled to the rotating component so as to lock the rotating component with one of the main body and the base. 
     A holding structure for an electronic device in one embodiment of the disclosure includes a carrier, an electronic device, and a plurality of lock mechanisms. The carrier has a first surface, a second surface opposite to the first surface, and an opening penetrating the first surface and the second surface. The electronic device includes a body and a case connecting to the body. The case abuts against the first surface of the carrier, and the body passes through the opening of the carrier. The body has a mounting part extending beyond the second surface of the carrier. The lock mechanisms are disposed at the periphery of the mounting part of the body. Each of the lock mechanisms includes a main body, a base, a rotating component and a position limiting component. The main body is detachably fastened with the mounting part of the body. The base is slidably connected to the main body, and the main body is sleeved on the base. The rotating component is pivoted to the main body. The rotating component drives the base to slide relative to the main body in a direction toward the second surface of the carrier and to abut against the second surface of the carrier, or drives the base to slide relative to the main body in a direction away from the second surface of the carrier to make the base and the second surface of the carrier separate from each other. The position limiting component is coupled to the rotating component so as to lock the rotating component with one of the main body and the base. 
     Based on the above, the lock mechanism of one embodiment of the disclosure is extremely convenient in operation. By driving the rotating component to rotate relative to the main body, the base is able to be directly or indirectly driven by the rotating component to slide relative to the main body. Since the holding structure for the electronic device adopts the lock mechanism in one embodiment of the disclosure, the steps to mount or remove the electronic device are extremely fast and easy for the operator. On the other hand, after the electronic device is locked on the carrier by the lock mechanisms, the rotating component is prevented from being arbitrarily rotated because of the engagement of the rotating component and the position limiting component. Accordingly, the electronic device is firmly mounted on the carrier. In other words, the holding structure for the electronic device in one embodiment of the disclosure has a good reliability. 
     In order to make the aforementioned and other features and advantages of the disclosure more comprehensible, embodiments accompanying figures are described in detail below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure. 
         FIG. 1  is an exploded view of a lock mechanism according to one embodiment of the disclosure. 
         FIG. 2  is a schematic view of a lock mechanism according to one embodiment of the disclosure. 
         FIG. 3A  and  FIG. 3B  are schematic views illustrating a mounting process of locking an electronic device with a carrier by the lock mechanism in one embodiment of the disclosure. 
         FIG. 3C  is a schematic view of locking the electronic device with the carrier by the lock mechanism in  FIG. 3B  at another implementation state. 
         FIG. 4  is a schematic top view of a holding structure of an electronic device according to one embodiment of the disclosure. 
         FIG. 5  is an exploded view of a lock mechanism according to another embodiment of the disclosure. 
         FIG. 6  is a schematic view of the lock mechanism according to another embodiment of the disclosure. 
         FIG. 7  is an exploded view of a lock mechanism according to yet another embodiment of the disclosure. 
         FIG. 8  is a schematic view of the lock mechanism according to yet another embodiment of the disclosure. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Reference will now be made in detail to the present preferred embodiments of the disclosure, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. 
     Referring to  FIG. 1  and  FIG. 2 , in the present embodiment, a lock mechanism  100  mainly includes a main body  110 , a base  120 , a rotating component  130 , and a position limiting element  150 . The main body  110  is a hollow housing and is sleeved on the base  120 . The base  120  is slidably connected to the main body  110 . The main body  110  has a top surface  110   a  and an opening  110   b  opposite to each other, and the base  120  may be completely accommodated inside the main body  110 , or at least one portion of the base  120  may exceed beyond the opening  110   b  and is exposed from the main body  110 . In the process of the base  120  sliding with respect to the main body  110 , the base  120  may slide through the opening  110   b  in a direction away from the top surface  110   a  and then to be exposed from the main body  110  or to increase the proportion of the base  120  exposed from the main body  110 . Otherwise, the base  120  may slide through the opening  110   b  in a direction toward the top surface  110   a  and then to be completely moved into and accommodated inside the main body  110  or to decrease the proportion of the base  120  exposed from the main body  110 . 
     Furthermore, in order to ensure the sliding connection between the base  120  and the main body  110  and to prevent the base  120  from departing from the main body  110  via the opening  110   b , the lock mechanism  100  is configured with a position limiting member  140  passing through the top surface  110   a  of the main body  110  and fastened to the base  120 . Still further, the top surface  110   a  of the main body  110  is configured with a through-hole  110   c , the position limiting member  140  is inserted into the main body  110  via the through-hole  110   c  and is fastened to the base  120  located inside the main body  110 . For example, the position limiting member  140  may be a positioning screw having the first end  141  and the second end  142  opposite to each other. The first end  141  has an external thread, and a bearing surface  120   a  facing the through-hole  110   c  of the base  120  is configured with a locking hole  120   b . The external thread of the first end  141  of the position limiting member  140  is used to engage with an internal thread of the locking hole  120   b  of the base  120 , so as to fasten the position limiting member  140  with the base  120 . On the other hand, the outer diameter of the second end  142  of the position limiting member  140  is greater than the outer diameter of the first end  141  of the position limiting member  140 , and the through-hole  110   c  is configured with a position limiting structure therein. In the process of the position limiting member  140  being slid along with the base  120  with respect to the main body  110 , if the base  120  slides in the direction away from the top surface  110   a , once the second end  142  of the position limiting member  140  interferes with the position limiting structure inside the through-hole  110   c , the base  120  stops sliding in the direction away from the top surface  110   a , so as to prevent the base  120  from departing from the main body  110 . In other words, the position limiting member  140  can be used to ensure the siding connection between the base  120  and the main body  110  and to ensure the base  120  being slid relative to the main body  110  within a specific stroke. 
     In the present embodiment, the rotating component  130  is pivoted to the main body  110  and is configured to abut against the base  120 . Furthermore, the rotating component  130  includes at least one cam  133  (schematically depicted as two) configured to abut against the bearing surface  120   a . Since the main body  110  covers the base  120 , the top surface  110   a  of the main body  110  is configured with at least one slot  111  (schematically depicted as two) so as to expose at least one portion of the bearing surface  120   a  of the base  120 . Each slot  111  is configured to accommodate one cam  133 , to make each cam  133  abut against the bearing surface  120   a  inside the corresponding slot  111 . Accordingly, in the process of the rotating component  130  rotating with respect to the main body  110 , based on the geometric profile variation of the cam  133 , the cam  133  may push the base  120 , and the base  120  may slide relative to the main body  110 . 
     The two slots  111  are respectively located at two opposite sides of the position limiting member  140  so as to make the two cams  133  of the rotating component  130  apply force to the base  120  evenly. For example, each slot  111  and the inner space of the main body  110  are mutually communicated, and each slot  111  further penetrates the top surface  110   a  and connects two opposite sidewall surfaces of the top surface  110   a , but the disclosure is not limited thereto. On the other hand, the number of the cams  133  is the same as the number of the slots  111 , and the number of the cams  133  and the number of the slots  111  are adjusted according to actual requirements. 
     Referring to  FIGS. 1 and 2  again, in the present embodiment, the cam  133  is pivoted to the main body  110  via a shaft  125 . In other words, the cam  133  is configured with a hole used for mounting the shaft  125 , and the hole of the cam  133  is located inside the corresponding slot  111 . On the other hand, correspondingly, the main body  110  is configured with a through-hole  110   d . The through-hole  110   d  is communicated with the slot  111 , and the through-hole  110   d  is aligned with the hole of the corresponding cam  133 , so as to mount the corresponding shaft  125 . Furthermore, the shaft  125  defines a reference axis AX that the rotating component  130  rotates about when rotating relative to the main body  110 , and the reference axis AX is misaligned with the position limiting member  140 . In other words, the extending direction of the reference axis AX does not pass through the position limiting member  140 , but the disclosure is not limited thereto. 
     To be more specific, the rotating component  130  further includes a gripping part  131  and at least one arm part  132  (schematically depicted as two). The gripping part  131  is connected to the cam  133  through the arm part  132 , and the gripping part  131  facilitates an operator to apply force to the rotating component  130 . It should be noted here, the number of the arm parts  132  can be adjusted according to the number of the cams  133 . 
     On the other hand, each cam  133  has a cam surface  133   s  abutting against the bearing surface  120   a  of the base  120 , and the cam surface  133   s  surrounds the shaft  125  (or the reference axis AX). When the rotating component  130  rotates about the reference axis AX with respect to the main body  110 , the cam  133  moves synchronously and the cam surface  133   s  abuts against the bearing surface  120   a  of the base  120  via different portions thereon. Because of the variation in distance between the portions on the cam surface  133   s  and the reference axis AX, the base  120  can be driven by the cam  133  to slide relative to the main body  110 . For example, in the process of rotating the cam  133 , if the distances between the reference axis AX and the portions of the cam surface  133   s  used to abut against the bearing surface  120   a  of the base  120  are gradually increased, the proportion of the base  120  exposed from the main body  110  may be gradually increased. On the contrary, if the distances between the reference axis AX and the portions of the cam surface  133   s  used to abut against the bearing surface  120   a  of the base  120  are gradually decreased, the proportion of the base  120  exposed from the main body  110  may be gradually decreased. Therefore, the geometric profile of the cam surface  133   s  of each cam  133  can be adjusted according to the requirement of sliding path of the base  120 . 
     It should be noted here, the shortest connecting line between the shaft  125  and the portion of the cam surface  133   s  of the cam  133  used to abut against the bearing surface  120   a  of the base  120  is substantially perpendicular to the bearing surface  120   a  and is substantially parallel to the direction (such as direction z) that the base  120  slides relative to the main body  110 . Accordingly, the force applied to the base  120  by the two cams  133  can be more concentrated, so as to assist stabilizing the abutting relationship between the two cams  133  and the base  120 . 
     Referring to  FIG. 1 ,  FIG. 2 , and  FIG. 3 , in order to ensure the state of the rotating component  130  is locked after rotating, the lock mechanism  100  further includes a position limiting element  150  disposed on the bearing surface  120   a  of the base  120 , and at least one portion of the position limiting element  150  is exposed by the slot  111 . On the other hand, the cam surface  133   s  of each cam  133  is configured with a plurality of position limiting portions  1331 , once the position limiting element  150  is engaged with one of the position limiting portions  1331 , the rotating component  130  is locked and temporarily unable to rotate relative to the main body  110 . After the force is applied to the rotating component  130  for releasing the engagement between the position limiting element  150  and the position limiting portion  1331 , the rotating component  130  can be rotated relative to the main body  110  again. In other words, after rotating a specific stroke, the rotating component  130  can be locked to the base  120  through the engagement of the position limiting element  150  and the position limiting portions  1331 , so as to prevent the rotating component  130  from rotating relative to the main body  110  arbitrarily. For example, the position limiting component  150  may be a convex structure protruding from the bearing surface  120   a  of the base  120 , and the position limiting portion  1331  may be a concave structure that is recessed inward on the cam surface  133   s  and fits with the convex structure. In another example, the position limiting component  150  may be a concave structure that is recessed inward on the bearing surface  120   a  of the base  120 , and the position limiting portion  1331  may be a convex structure protruding from the cam surface  133   s  and fitting with the concave structure. 
     The mounting process of the electronic device  50  being locked to a carrier  60  by the lock mechanism  100  is described hereinafter. Referring to  FIG. 3A , the carrier  60  may be a portion of a machine, a portion of a wall, a frame or other carrier. The carrier  60  has the first surface  60   a , the second surface  60   b  opposite to the first surface  60   a , and an opening  61  penetrates the first surface  60   a  and the second surface  60   b . Furthermore, the opening  61  can be used to accommodate the electronic device  50 . The electronic device  50  includes a body  51  and a case  52  connecting to the body  51 , and the case  52  surrounds the periphery of the body  51  (as shown in  FIG. 4 ). On the other hand, the size of the body  51  is smaller than the size of the opening  61 , and the size of the case  52  is greater than the size of the opening  61 . 
     Firstly, the body  51  of the electronic device  50  is passed through the opening  61  of the carrier  60  from the first surface  60   a  of the carrier  60 . Since the size of the case  52  is greater than the size of the opening  61 , the case  52  would structurally interferes with the first surface  60   a  of the carrier  60  so as to stop the body  51  from moving. At this time, a mounting part  53  of the body  51  exceeds beyond the second surface  60   b  of the carrier  60 . After the case  52  abuts against the first surface  60   a  of the carrier  60 , the lock mechanism  100  is disposed at the periphery of the mounting part  53  of the body  51 . The mounting part  53  is configured with a mounting hole  53   a  that is provided for a locking portion  115  of the main body  110  inserting into and thus is engaged with the locking portion  115 . In contrast, after the engaging relationship of the locking portion  115  of the main body  110  and the mounting hole  53   a  of the mounting part  53  is released, the lock mechanism  100  can be detached from the body  51 . 
     Next, referring to  FIGS. 3A and 3B , the lock mechanism  100  and the case  52  are respectively located at two opposite sides of the carrier  60 , and the opening  110   b  of the main body  110  faces the second surface  60   b  of the carrier  60 . After the lock mechanism  100  is locked to the mounting part  53  of the body  51 , the main body  110  remains stationary, and the rotating component  130  is rotated in a rotating direction RD and with respect to the main body  110 . The base  120  may be pushed by the cam  133  and thus is moved in the direction toward the second surface  60   b  of the carrier  60 . After the base  120  abuts against the second surface  60   b  of the carrier  60 , the position limiting element  150  is engaged with one of the position limiting portions  1331 , as shown in  FIG. 3B . At this time, the base  120  presses against a cushioning pad  101  which is deformable, so the cushioning pad  101  is deformed and abuts against the second surface  60   b  of the carrier  60 . Accordingly, the electronic device  50  can be securely mounted to the carrier plate  60 . On the other hand, the operator only needs to rotate the rotating component  130  relative to the main body  110  in the reverse direction of the rotating direction RD (shown in  FIG. 3B ), the step of detaching the electronic device  50  from the carrier  60  may be gradually completed. 
     It should be noted here, the cam surface  133   s  of the cam  133  may be configured with a plurality of position limiting portions  1331 . Accordingly, the lock mechanism  100  may lock the electronic device  50  to the carriers having different thicknesses base on the multi-stage locking design, so as to provide a better operating flexibility. In another embodiment, after the base  120  abuts against the second surface  60   b  of the carrier  60  and the position limiting element  150  is engaged with one of the position limiting portions  1331  (as shown in  FIG. 3B ), the operator can continuously rotate the rotating component  130  relative to the main body  110  in the rotating direction RD, so the base  120  continues to move closer to the second surface  60   b  of the carrier  60  and further compresses the cushioning pad  101  until the position limiting element  150  is engaged with the next position limiting portion  1331  and the gripping part  131  of the rotating component  130  abuts against the mounting part  53  of the body  51 , as shown in  FIG. 3C   
     The base  120  further makes the cushioning pad  101  presses against the second surface  60   b  of the carrier  60 , so the looking portion  115  of the main body  110  may drive the mounting part  53  of the body  51  to further move in the direction away from the second surface  60   b  of the carrier  60 , and thus the case  52  presses even harder to the first surface  60   a  of the carrier  60 . Accordingly, the electronic device  50  can be more securely mounted to the carrier  60 , so as to have better reliability. 
     Referring to  FIG. 3B ,  FIG. 3C , and  FIG. 4 , the electronic device  50  is locked to the carrier  60  by a plurality of lock mechanisms  100 . The lock mechanisms  100  are disposed at the periphery of the mounting part  53  of the body  51 , and an orthogonal projection of the base  120  of each lock mechanisms  100  on the carrier  60  and an orthogonal projection of the case  52  of the electronic device  50  on the carrier  60  are overlapped with each other. In other words, in the direction perpendicular to the first surface  60   a  or the second surface  60   b  of the carrier  60 , the base  120  of each lock mechanisms  100  is overlapped with the electronic device  50 . Therefore, the force applied to the carrier  60  by the base  120  of each lock mechanisms  100  is aligned with the force applied to the carrier  60  by the case  52  of the electronic device  50 , so as to increase the stability of the electronic device  50  mounted on the carrier  60 . 
     Furthermore, as shown in  FIG. 1 ,  FIG. 2 , and  FIG. 3A  to  FIG. 3C , the lock mechanism  100  further includes an elastic member  160 , and the elastic member  160  is a compressed spring as an example. The elastic member  160  is sleeved on the position limiting member  140 , and two opposite ends of the elastic member  160  respectively abut against the main body  110  and the second end  142  of the position limiting member  140 . Furthermore, the through-hole  110   c  of the main body  110  is configured with a position limiting structure therein, and one end of the elastic member  160  may be inserted into the through-hole  110   c  and abut against the position limiting structure inside the through-hole  110   c . In the process of the position limiting member  140  being slid along with the base  120  with respect to the main body  110 , if the base  120  slides in the direction away from the top surface  110   a , the elastic member  160  is compressed by the second end  142  of the position limiting member  140 . At this time, the compressed elastic member  160  can apply a reaction force on the second end  142  of the position limiting member  140 , so as to indirectly make the base  120  receive a force. Consequently, the bearing surface  120   a  of the base  120  is tightly attached to the cam surface  133   s  of the cam  133 . Therefore, the engagement of the position limiting element  150  and one of the position limiting portions  1331  is more stable based on the design of the elastic member  160 . 
     On the other hand, the first end  141  of the position limiting member  140  is fastened to the base  120 , and the depth that the first end  141  of the position limiting member  140  fastened into the locking hole  120   b  can be adjusted. The greater the depth that the first end  141  of the position limiting member  140  fastened into the locking hole  120   b  is, the greater the amount of compression that the elastic member  160  compressed by the second end  142  of the position limiting member  140  becomes. The greater the amount of compression that the elastic member  160  compressed by the second end  142  of the position limiting member  140  in advance is, the greater the force that the operator needs to apply to rotate the rotating component  130  becomes. Correspondingly, the engagement of the position limiting element  150  and one of the position limiting portions  1331  is based on a greater amount of pre-compression of the elastic member  160  and thus is more stable. 
     In the following, other embodiments will be described in detail to explain the disclosure in detail, and the same components will be denoted by the same reference numerals, and the description of the same technical content will be omitted. For the omitted part, please refer to the foregoing embodiments, and details are not described below. 
       FIG. 5  is an exploded view of a lock mechanism according to another embodiment of the disclosure.  FIG. 6  is a schematic view of the lock mechanism according to another embodiment of the disclosure. It should be noted here, in order to clearly show the internal configuration of the main body  110 , the main body  110  in  FIG. 6  is represented by dotted line. 
     Referring to  FIG. 5  and  FIG. 6 , a lock mechanism  100 A in the present embodiment and the lock mechanism  100  in the previous embodiment are substantially similar in design principle, the main differences are the configuration of the position limiting element  150 A and the structural design of the cam  133 A. In the present embodiment, the position limiting element  150 A is disposed on the main body  110 . The number of the position limiting elements  150 A are two, and each slot  111  is configured with one position limiting element  150 A correspondingly. Furthermore, at least a portion of each position limiting element  150 A extends into the corresponding slot  111  and is fitted with the cam  133 A disposed inside the corresponding slot  111 . For example, the main body  110  is configured with two through-holes  110   e . The two through-holes  110   e  are respectively communicated with two slots  111 , and the two through-holes  110   e  are used to accommodate the two position limiting elements  150 A. Each of the position limiting elements  150 A passes through the corresponding through-hole  110   e  and extends into the slot  111 . The two position limiting elements  150 A may be pogo pins, but the disclosure is not limited thereto. 
     On the other hand, the cam  133 A has a plurality of position limiting portions  1332 . The position limiting portions  1332  are located on a side surface  133   m  connecting with the cam surface  133   s  (as shown in  FIG. 6 ) and are surrounded by the cam surface  133   s . For example, the position limiting portions  1332  of the cam  133 A may be a plurality of locking holes surrounding the shaft  125  that is configured to pivotally connect the cam  133 A to the main body  110 . The shortest distances from the position limiting portions  1332  of the cam  133 A to the corresponding shaft  125  are substantially the same to ensure that the corresponding position limiting element  150 A is able to engage with any one of the position limiting portions  1332 . In other words, the cam  133 A is rotated about the reference axis AX to define the rotating path of the position limiting portions  1332 , and the position limiting element  150 A is located on the rotating path. 
     Take a step further, in the process that each cam  133 A is rotated about the reference axis AX and relative to the main body  110 , once any one of the position limiting portions  1332  is aligned with the position limiting element  150 A on the main body  110 , the position limiting element  150 A may be locked into that position limiting portion  1332 . Therefore, the rotating component  130 A is locked and is unable to rotate relative to the main body  110 , temporarily. After a force is applied to the rotating component  130 A to release the engagement between the position limiting element  150 A and the position limiting portion  1332 , the rotating component  130 A can be rotated relative to the main body  110  again. In other words, after rotating a specific stroke, the rotating component  130 A can be locked to the main body  110  through the fitting of the position limiting element  150 A and the position limiting portions  1332  of the corresponding cam  133 A. 
       FIG. 7  is an exploded view of a lock mechanism according to yet another embodiment of the disclosure.  FIG. 8  is a schematic view of the lock mechanism according to yet another embodiment of the disclosure. It should be noted here, in order to clearly show the engagement of the main body  110  and the rotating component  130 B, the rotating component  130 B in  FIG. 8  is represented by dotted line. 
     Referring to  FIG. 7  and  FIG. 8 , a lock mechanism  100 B in the present embodiment and the lock mechanism  100  in the previous embodiment are substantially similar in design principle, the main differences are the method of the rotating component  130 B driving the base  120 , the structural design of the main body  110 B, the structural design of the rotating component  130 B, and the configuration of the position limiting element  150 B. In the present embodiment, the main body  110 B has two side walls  110   f  connecting to the top surface  110   a . The lock mechanism  100 B further includes at least one guiding member  145  (schematically depicted as two), and the two guiding members  145  respectively pass through the two side walls  110   f  of the main body  110 B to be fastened to the two opposite sides of the base  120 . Take a step further, the two guiding members  145  have one degree of freedom for sliding relative to the main body  110 B, and the base  120  is able to slide along with the two guiding members  145  and relative to the main body  110 B. 
     The rotating component  130 B includes at least one arm part  132  (schematically depicted as two), and the two arm parts  132  are respectively pivoted to the two side walls  110   f . To be more specific, the two guiding members  145  respectively pass through the two arm parts  132 , and each of the two guiding members  145  has one degree of freedom for sliding relative to the corresponding arm part  132 . Therefore, in the process of the rotating component  130 B being rotated relative to the main body  110 B, each of the guiding members  145  is driven by the corresponding arm part  132  to slide relative to the main body  110 B, so as to drive the base  120  to slide relative to the main body  110 B. For example, each arm part  132  has a first position limiting slot  1321 , and each side wall  110   f  is configured with a second position limiting slot  112 . The first position limiting slot  1321  of each arm part  132  is partially overlapped with the second position limiting slot  112  of the corresponding side wall  110   f , and the second position limiting slot  112  of each side wall  110   f  exposes at least one portion of the base  120 . Therefore, each guiding member  145  can sequentially pass through the corresponding first position limiting slot  1321  and the corresponding second position limiting slot  112 , such that the first guiding member  145  may be fastened into the base  120 . 
     On the other hand, the main body  110 B is configured with a shaft  126  at each side wall  110   f  (i.e., the side that the second limiting slot  112  is located). Each shaft  126  and the corresponding second position limiting slot  112  are arranged side by side, and the arm part  132  is pivoted to the main body  110 B through the shaft  126 . To be more specific, the rotating component  130 B can be rotated relative to the main body  110 B and about the reference axis AX of the two shafts  126 , so as to drive each guiding member  145  to slide within the corresponding first position limiting slot  1321  and the corresponding second position limiting slot  112 , and thus to drive the base  120  to slide relative to the main body  110 B. In the present embodiment, the sliding direction of each guiding member  145  within the corresponding second position limiting slot  112  is perpendicular to the reference axis AX. In addition, along with the rotation of the rotating component  130 B relative to the main body  110 B, the position of the guiding member  145  within the corresponding first position limiting slot  1321  is also changed. In other words, the rotation of the rotating component  130 B relative to the main body  110 B can drive the guiding member  145  to slide within the corresponding second position limiting slot  112 . On the other hand, the sliding direction of each guiding member  145  within the corresponding first position limiting slot  1321  may be the extending direction of that first position limiting slot  1321 . 
     Accordingly, the sliding direction of each guiding member  145  within the corresponding second position limiting slot  112  may be the extending direction of that second position limiting slot  112 . The extending directions of the first position limiting slot  1321  and the second position limiting slot  112 , which are corresponding to each other, are always kept to be intersected with each other, so as to ensure that each guiding member  145  is driven by the rotating component  130 B. 
     In the present embodiment, the main body  110 B further has a bearing surface  110   s . The bearing surface  110   s  is located between the two side walls  110   f  and is connected to the top surface  110   a  and the two side walls  110   f . To be more specific, the position limiting element  150 B is disposed on the bearing surface  110   s  and includes a plurality of position limiting portions  151 . On the other hand, the gripping part  131  of the rotating component  130 B has an engaging portion  135  on a side facing the bearing surface  110   s , and the engaging portion  135  is used to engage with the position limiting portions  151 . Furthermore, the position limiting portions  151  are located on the moving path of the engaging portion  135 . In the process that the rotating component  130 B is rotated relative to the main body  110 B, the engaging portion  135  can be moved toward the position limiting portions  151  and thus is engaged with one of the position limiting portions  151 . Once the engaging portion  135  is engaged with one of the position limiting portions  151 , the rotating component  130 B is locked and temporarily unable to rotate relative to the main body  110 B. After the force is applied to the rotating component  130 B to release the engagement between the engaging portion  135  and the position limiting component  150 , the rotating component  130 B can be rotated relative to the main body  110 B again. In other words, after rotating a specific stroke, the rotating component  130 B can be locked to the main body  110 B through the engagement of the engaging portion  135  and the position limiting component  150 B. 
     For example, the position limiting component  150 B may be a crest and sag structure located on the bearing surface  110   s , and the engaging portion  135  may be a convex structure or a concave structure that fits with the crest and sag structure. On the other hand, the main body  110 B further has a recess  113  located on the bearing surface  110   s . The recess  113  extends from the top surface  110   a  to the bottom surface opposite to the top surface  110   a , and the position limiting component  150 B is disposed in the recess  113  and at a side away from the top surface  110   a  (such as the side close to the bottom surface) for example. Since the engaging portion  135  extends into the recess  113 , the engaging portion  135  may be guided by the recess  113  while moving on the bearing surface  110   s , so as to ensure that the engaging portion  135  to move through the position limiting component  150 B. 
     In summary, the lock mechanism of one embodiment of the disclosure is extremely convenient in operation. By driving the rotating component to rotate relative to the main body, the base is able to be directly or indirectly driven by the rotating component to slide relative to the main body. Since the holding structure for the electronic device adopts the lock mechanism in one embodiment of the disclosure, the steps to mount or remove the electronic device are extremely fast and easy for the operator. On the other hand, after the electronic device is locked on the carrier by the lock mechanisms, the rotating component is prevented from being arbitrarily rotated because of the engagement of the rotating component and the position limiting component. Accordingly, the electronic device is firmly mounted on the carrier. In other words, the holding structure for the electronic device in one embodiment of the disclosure has a good reliability. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the disclosed embodiments without departing from the scope or spirit of the disclosure. In view of the foregoing, it is intended that the disclosure cover modifications and variations of this disclosure provided they fall within the scope of the following claims and their equivalents.