# Patent

## Title
Battery cover locking mechanism of a mobile terminal and method of manufacturing the same

## Abstract

The present invention provides a locking mechanism in a mobile terminal and method of manufacturing the same. The locking mechanism comprises a lock button, a slide latch, and spring member. The slide latch may slide between a first position and a second position and comprises a hole and snaps, the hole is on the top of the slide latch and extends through the slide latch, the snaps are at the front side of the slide latch. The lock button is in the hole and comprises a press part and a support part, the support part being connected to the press part and extending downward from the press part through the hole to be in contact with the contact part on the spring member; the spring member is fixed with the slide latch and comprises an spring reaction part, a contact part and a protrusion part, the contact part being in contact with the support part of the lock button and a force from the support part causing a spring deformation in the spring reaction part.

## Background
TECHNICAL FIELD
The present invention relates to a locking mechanism of a back cover of a portable device, and more particularly to a battery cover locking mechanism of a mobile terminal.
BACKGROUND OF THE INVENTION
Mobile terminal devices (e.g., mobile phone, tablet, Personal Digital Assistant (PDA), and remote controller) are more and more into people's work and life to provide much more conveniences for people's work and life. At present, most of the mobile terminals need a battery to power them.
Generally, Industry Mobile Terminal's battery is hard to remove, especially to those need water proof by sealing O-ring, if the battery is too easy to remove, it will easy fail in a drop test.
However, in industrial application, usually the battery may need to be replaced frequently in the field, so we need to design a battery cover locking mechanism which is easy to unlock but could survive the drop test.
SUMMARY OF THE INVENTION
In the embodiments of the present invention, there is provided a locking mechanism in a mobile terminal, comprising a lock button, a slide latch, and an spring member; the slide latch may slide between a first position and a second position, and the slide latch comprises a hole and snaps, the hole is on the top of the slide latch and extends through the slide latch, and the snaps are at the front side of the slide latch; the lock button is in the hole and comprises a press part and a support part, the support part being connected to the press part and extending downward from the press part through the hole to be in contact with the contact part on the spring member; the spring member is fixed with the slide latch and comprises an spring reaction part, a contact part and a protrusion part, the contact part being in contact with the support part of the lock button and a force from the support part causing a spring deformation in the spring reaction part; when an external force is applied to the press part of the lock button to move the lock button downward, the support part transfers the force to the contact part of the spring member so that the contact part applies the force to the spring reaction part to result in a spring deformation, the spring deformation causes the contact part to move, thereby bringing the protrusion part (354) moving to an unblocked position; in a case where the protrusion part is not blocked, the slide latch may slide between the first position and the second position for snapping or unsnapping by the snap.
In a further embodiment of the present invention, there is provided a mobile terminal comprising a back housing, the back housing comprising a back housing body and a battery cover, the locking mechanism according to any one of examples 1-8 is located in one of the back housing body and the battery cover; and a second snap is formed on the other one of the back housing and the battery cover, for snapping with the snap on the slide latch in the locking mechanism to fix the back housing body and the battery cover together.
In still a further embodiment of the present invention, there is provided a method of manufacturing a locking mechanism in a mobile terminal, the locking mechanism comprising a lock button, a slide latch, and spring member, the method comprising: providing the slide latch, the slide latch may slide between a first position and a second position and comprise a hole and snaps, the hole is on the top of the slide latch and extends through the slide latch, and the snaps are at the front side of the slide latch; providing the lock button in the hole, the lock button comprising a press part and a support part, the support part being connected to the press part and extending downward from the press part through the hole to be in contact with the contact part on the spring member; providing the spring member and enabling the spring member to be fixed with the slide latch, the spring member comprising an spring reaction part, a contact part and a protrusion part, the contact part being in contact with the support part of the lock button and a force from the support part causing a spring deformation in the spring reaction part; when an external force is applied to the press part of the lock button to move the lock button downward, the support part transfers the force to the contact part of the spring member so that the contact part applies the force to the spring reaction part to result in a spring deformation, the spring deformation causes the contact part to move, thereby bringing the protrusion part moving to an unblocked position; in a case where the protrusion part is not blocked, the slide latch may slide between the first position and the second position for snapping or unsnapping by the snap.



BRIEF DESCRIPTION OF THE DRAWINGS
Various embodiments in different aspects of the disclosure are illustrated in the drawings for interpreting the principle of the present invention together with the description. It may be appreciated by those skilled in the art that the specific embodiments shown by the drawings are merely illustrative, which are not intended to limit the scope of the present invention. It should be realized that one element in some embodiments may be separated into a plurality of elements, or a plurality of elements may be combined into one element. To describe the illustrative embodiments of the present invention in a greater detail so that those skilled in the art can understand different aspects of the disclosure as well as features and advantageous more thoroughly, now referring to the drawings, wherein
FIG. 1 is a conceptual diagram illustrating the Industry Mobile Terminal's back housing according to the embodiment of the present invention.
FIG. 2 is an unfolded diagram showing the structure of Industry Mobile Terminal's back housing in FIG. 1 according to the embodiment of the present invention;
FIGS. 3A-3D are section views of the locking mechanism according to the embodiment of the present invention;
FIG. 4 is a structural diagram of the spring member according to the embodiment of the present invention;
FIG. 5 is a perspective view of the slide latch according to the embodiment of the present invention;
FIG. 6 is a perspective view of the battery cover according to the embodiment of the present invention;
FIGS. 7A-B are section views illustrating the back housing body of the Industry Mobile Terminal snapping with or unsnapping from the battery cover according to the embodiment of the present invention.



DETAILED DESCRIPTION OF THE EMBODIMENTS
Some terms are used to indicate particular system components throughout the application document. The terms “comprising”, “including” and “having” are used in an open form in the present application document, thus they may be interpreted as “including but not limited to . . . ”. In addition, terms “essentially”, “substantially” or “approximately” that may be used in the document relate to the tolerance of corresponding terms accepted in the industry.
Many specific details are provided in the following descriptions for the purpose of interpretation to provide a thorough understanding of the present invention. However, it may be apparent to those skilled in the art that the apparatus, method and device of the present invention may be implemented without these specific details. Reference to “embodiment”, “example” or similar words in the present description means the specific features, structures or characteristics described in the embodiment or example are included in at least one of the embodiments or examples, but may not be included in other embodiments or examples.
FIG. 1 is a conceptual diagram illustrating the Industry Mobile Terminal's back housing according to the embodiment of the present invention. As shown by FIG. 1, the back housing 100 of the Industry Mobile Terminal comprises a back housing body 130 and a battery cover 110. A battery assembly (not shown) is provided below the battery cover 110, or the battery assembly may also be integral with the battery cover together so that the battery assembly may be taken out by detaching the battery cover 110. The back housing body 130 comprises a locking mechanism 120, certainly the back housing body 130 may also comprise various other components such as a camera, a flash lamp, a fingerprint recognition device and the like. Since these components are not closely related to the invention object, no more unnecessary details will be provided here. The battery cover 110 is bonded to the back housing body 130 via the locking mechanism 120.
As shown by FIG. 1, the locking mechanism 120 is provided in the back housing body 130. Optionally, the locking mechanism 120 may also be provided in the battery cover 110. The locking mechanism 120 comprises a lock button 121, a slide latch 122 and an spring member (not shown), which will be described in detail below. The slide latch 122 comprises a hole 124, and the lock button 121 is inserted into the hole 124.
The slide latch 122 may slide leftward to the first position and slide rightward to the second position. When the slide latch 122 is in the first position, the battery cover 110 is snapped with the back housing body 130, and when the slide latch 122 is in the second position, the battery cover 110 is unsnapped with the back housing body 130, so that the battery cover and the battery assembly may be detached by one hand only, as shown by the indicator 123 in FIG. 1. Of course, the snapping position and the unsnapping position may be interchanged, e.g., the first position is the unsnapping position and the second position is the snapping position. The lock button 121 is provided in the hole 124 of the slide latch 122 for locking or unlocking the slide latch 122. For example, if the slide latch 122 is locked by the lock button 121, the slide latch 122 can not slide to the left or right, thereby avoiding loose of the battery cover 110 and the back housing body 130 due to unsnapping them erroneously or undeliberately. For example, the spring member (not shown) may be triggered by pressing the lock button 121 to unlock the slide latch 122 so that the slide latch 122 may slide to the left and right freely. Once the lock button 121 is released, the slide latch 122 will be relocked, which will be described in detail below.
FIG. 2 is an unfolded diagram showing the structure of Industry Mobile Terminal's back housing in FIG. 1 according to the embodiment of the present invention. The unfolded diagram of FIG. 2 is a schematic diagram illustrating the structure of FIG. 1 after being turned over. As shown by FIG. 2, the back housing body 130 comprises a mounting part 131 for receiving the locking mechanism 120. The mounting part 131 comprises a first mounting base 133 (not shown in FIG. 2) on a first side of the mounting part and a second mounting base 132 on a second side of the mounting part, wherein the first side and the second side are opposite to each other. The first mounting base 133 is separated from the second mounting base 132 by a partition board 134. As shown by FIG. 2, a protruded block 134d, which cooperates with the spring member 125, is formed on the partition board 134 in the second mounting base, the cooperation principle thereof will be discussed below. Three sliding slots, i.e., a first sliding slot 134a, a second sliding slot 134b and a third sliding slot 134c are further formed on the partition board 134. The three sliding slots extend in a lengthwise direction of the partition board 134 and communicate the first mounting base 133 and the second mounting base 132.
The locking mechanism 120 comprises a lock button 121, a slide latch 122, and an spring member 125. The lock button 121 is mounted on the slide latch 122 through the hole 124, and the lock button 121 and the slide latch 122 are both mounted in the first mounting base 133. The spring member 125 is in the second mounting base 132, and screws 126 and a nuts 127 pass through the first sliding slot 134a and the third sliding slot 134c to fix the spring member 125 with the slide latch 122, so that the slide latch 122 and the spring member 125 may slide along the sliding slot together. The spring member 125 may interact with the block 134d during the sliding, as described in detail by FIG. 3 below. Furthermore, a part (i.e., the support part, see FIG. 3) of the lock button 121 extends through the second sliding slot 134b to be in contact with the spring member 125.
FIGS. 3A-3D are section views of the locking mechanism 120 according to the embodiment of the present invention, the section views are obtained by sectioning along the line A-A as shown by FIG. 1. FIGS. 3A-3D show the unlocking process of the locking mechanism 120.
First, referring to FIG. 3A, it depicts the constituting structure of the locking mechanism 120 mounted in the mounting part 131 of the back housing body 130. The locking mechanism 120 comprises a lock button 121, a slide latch 122 and an spring member 125. The lock button 121 is mounted in the hole 124 of the slide latch 122, and both of them are located in the first mounting base 133. The lock button 121 comprises a press part 313, a support part 312 and a fixing part 311. The press part 313 is to be pressed by an operator to perform the action of the lock button. The support part 312 is connected to the press part 313 and extends downward from the press part through the second sliding slot 134b in the partition board 134 (see FIG. 2), the downward extension may be vertical downward, inclined downward or downward in any path (e.g., arc-shape or bending-shape). The support part 312 extends downward to be in contact with the contact part 353 of the spring member 125 located in the second mounting base 132. The fixing part 311 of the lock button is connected to the press part 313 and extends laterally from the bottom of the press part 313, the extending range goes beyond the range of the hole 124 in the slide latch so that the fixing part 311 is blocked by the periphery portion of the hole 124, preventing detachment of the lock button 121 from the hole 124. In another embodiment, the fixing part 311 may also extend laterally from the support part 312, with its extending range going beyond the range of the hole 124 in the slide latch. In still another embodiment, the fixing part 311 may adopt any other suitable structure, so long as it prevents detachment of the lock button 121 from the slide latch 122 and allows up and down movement of the lock button.
The slide latch 122 comprises a hole 124 formed approximately in a middle position thereof for receiving the press part 313 of the latch button 121. The slide latch 122 further comprises a projecting tongue 122a formed at a side in its lengthwise direction, which matches with a lateral slot 133a formed at a side of the first mounting base 133, so that at least a part of said projecting tongue stays in the lateral slot no matter the slide latch 122 slides to the left or to the right.
The spring member 125 comprises a flat part 351, an spring reaction part 352, a contact part 353 and a protrusion part 354. The flat part 351 is located at one end of the spring member 125 and fixed to the bottom of the slide latch 122 by fixing units which pass through the first sliding slot 134a and the third sliding slot 134c (see FIG. 2). The spring reaction part 352 is located between the flat part 351 and the contact part 353. The spring reaction part 352 may include a downward recess part or any other structure that can produce a spring deformation. The contact part 353 contacts the bottom of the support part 312 of the lock button 121 that passes through the second sliding slot 134b (see FIG. 2). In a case where the lock button 121 is not pressed, the contact part provides a certain upward preset spring force to the lock button 121 so that the lock button will not drop down. The protrusion part 354 is formed at one end of the contact part 353, as shown by the FIGURE, the spring reaction part 352 is connected to the other end of the contact part 353. The protrusion part 354 comprises a left side 354a and a right side 354b. 
Still referring to FIG. 3A, it shows the situation where the slide latch 122 is locked and can not move to the left or right. As shown in the FIGURE, when the slide latch 122 is locked, the lock button is not pressed down, the spring member 125 receives no force for moving downward from the support part 312, and the protrusion part 354 on the spring member is in its first position. At the first position of the protrusion part 354, the protrusion part 354 is located in the second sliding slot 134b so that right side 354b of the protrusion part is blocked by the right wall of the second sliding slot 134b, resulting in that the slide latch 122 can not move to the right. At this position, the slide latch also can not move to the left since its left side is limited by the left wall of the first mounting base 133.
Furthermore, the block 134d formed on the partition board 134 may also interact with the spring member 125. A gap 353a may be formed in the contact part 353 of the spring member 125. In a case where the lock button 121 is not pressed and no spring deformation of the spring reaction part 352 occurs, the gap is blocked by the block 134d, thereby further preventing the slide latch 122 from moving to the right.
Next, referring to FIG. 3B, an operator presses the press part 313 on the lock button 121 so that the lock button moves downward. The support part 312 of the lock button presses the contact part 353 of the spring member so that the spring reaction part 352 produces a downward spring deformation. The spring deformation brings the contact part 353 and the protrusion part 354 to move downward so that the protrusion part 354 leaves away from the blocking range of the right wall of the second sliding slot 134b, meanwhile the gap 353a of the contact part 353 leaves away from the blocking range of the block 134d. Then, the right wall 354b of the protrusion part is no longer blocked by the block 134d, thus the sliding latch may slide to the right.
Now referring to FIG. 3C, when the lock button 121 is pressed down, the slide latch 122 and the spring member 125 are pushed a distance toward the right which is sufficient to make the protrusion part 354 on the spring member 125 go beyond the distance between the right wall of the second sliding slot 134b and the left wall of the third sliding slot 134c. 
Then referring to FIG. 3D, as shown by FIG. 3C, the slide latch 122 moves a distance to the right to make the protrusion part 354 go beyond the distance between the right wall of the second sliding slot 134b and the left wall of the third sliding slot 134c. Then, the lock button 121 is released to make the spring deformation of the spring member 125 recovered, the contact part and the protrusion part 354 moves upward, thus the protrusion part 354 enters the third sliding slot 134C, at this time the left side 354a of the protrusion part 354 is blocked by the left wall of the third sliding slot 134c, resulting in that the spring member 125 and the slide latch 122 can not move to the left, meanwhile, the slide latch 122 also can not move to the right since its right side is limited by the right wall of the first mounting base 133.
FIGS. 3A-3D describe in detail the process of controlling the sliding latch 122 to slide from left to right by the lock button 121. As to the process of the sliding latch 122 sliding from right to left, it may be easily derived by those skilled in the art according to the foregoing descriptions, no more unnecessary details will be provided here.
FIG. 4 is a structural diagram of the spring member 125 according to the embodiment of the present invention. As shown by FIG. 4, the spring member 125 may be made of spring sheets such as metal sheet and may comprise a flat part 351, a spring reaction part 352, a contact part 353 and a protrusion part 354. The spring member may further comprise a mounting base 125a, a through hole is formed on the mounting base 125a, the mounting base 125a is mounted on the slide latch 122 by using a screw (126 in FIG. 2) and a nut (127 in FIG. 2) (see FIGS. 3A-D). As shown by FIG. 4, a gap 353a is formed in the contact part 353 of the spring member, the gap 353a interact with the block 134d (see FIG. 2) formed on the partition board 134. For example, when the slide latch 122 is in the first position as shown by FIG. 3 and the lock button 121 is not pressed down, the block 134d blocks the edge of the gap 353a from crossing over the block 134d. When the lock button 121 is pressed down, the spring member is subject to a spring deformation, bringing the edge of the gap 353a moving out of the blocking area of the block 134d. 
The mechanism where the slide latch 122 in the locking mechanism 120 slides to the left and right between the first position and the second position is descried in the foregoing paragraphs. How to enable the back housing body 130 to snap or to unsnap with the battery cover 110 by the moving of slide latch 122 to the left and right will be described in detail below.
FIG. 5 is a perspective view of the slide latch 122 according to the embodiment of the present invention. As shown by FIG. 5, the slide latch 122 comprises: a hole 124 for receiving the lock button 121, an indicator 123 for indicating a sliding direction and a locking state of the slide latch 122, a projecting tongue 122a formed at a side in the lengthwise direction of the slide latch 122, and a snap 122b formed at the front side of the slide latch. As shown by the FIGURE, the snap comprises a lateral extension part and vertical extension part to form a bending structure. The snap 122b slides to the left and right along with the slide latch thereby to be snapped or unsnapped with another snap on the battery cover 110.
FIG. 6 is a perspective view of the battery cover 110 according to the embodiment of the present invention. As shown by FIG. 6, the battery cover 110 comprises a battery cover body 110a, a second snap 110b on the top of the battery cover 110 and positioning components 110c on both sides of the battery cover body 110a. Optionally, the battery cover 110 may further comprise a battery assembly integral with the battery cover body 110a. Positioning components 110c are used to cooperate with the corresponding components in the back housing body 130 to prevent the battery cover 110 from shifting to the left and right during usage. The second snap 110b is also a bending structure that comprises a lateral extension part and a vertical extension part. The second snap 110b is used to snap with the snap 122b on the slide latch 122 so that the back housing body 130 and the battery cover 110 are snapped together.
FIGS. 7A-B are section views illustrating the back housing body of the Industry Mobile Terminal snapping with or unsnapping from the battery cover according to the embodiment of the present invention, wherein the section views are obtained by sectioning along the line B-B as shown by FIG. 1.
Referring to FIG. 7A, wherein the slide latch 122 is located at the left side, first position, the snap 122b on the slide latch 122 is snapped with the second snap 110b on the battery cover 110 so that the back housing body 130 of the Industry Mobile Terminal is snapped with the battery cover 110.
Referring to FIG. 7B, wherein the slide latch 122 is located at the right side, second position, the snap 122b on the slide latch 122 is unsnapped from the second snap 110b on the battery cover 110 so that the battery cover 110 and the corresponding battery assembly may be detached from the mobile terminal by one hand only.
Specific examples of the present invention are provided below:
Example 1
A locking mechanism in a mobile terminal, comprising a lock button, a slide latch, and an spring member,
the slide latch may slide between a first position and a second position, and the slide latch comprises a hole and snaps, the hole is on the top of the slide latch and extends through the slide latch, and the snaps are at the front side of the slide latch;
the lock button is in the hole and comprises a press part and a support part, the support part being connected to the press part and extending downward from the press part through the hole to be in contact with the contact part on the spring member;
the spring member is fixed with the slide latch and comprises an spring reaction part, a contact part and a protrusion part, the contact part being in contact with the support part of the lock button and a force from the support part causing a spring deformation in the spring reaction part;

when an external force is applied to the press part of the lock button to move the lock button downward, the support part transfers the force to the contact part of the spring member so that the contact part applies the force to the spring reaction part to result in a spring deformation, the spring deformation causes the contact part to move, thereby bringing the protrusion part (354) moving to an unblocked position;

in a case where the protrusion part is not blocked, the slide latch may slide between the first position and the second position for snapping or unsnapping by the snap.

Example 2
The locking mechanism according to example 1, wherein the press button further comprises a fixing part for preventing detachment of the lock button from the hole.
Example 3
The locking mechanism according to example 1, wherein the spring member is made of elastic spring sheet, and the spring member further comprises a flat part, and the flat part, the spring reaction part, the contact part and the protrusion part are connected in turn.
Example 4
The locking mechanism according to example 1, wherein a partition board is provided between the spring member and the slide latch, when no external force is applied to the press part of the lock button, the protrusion part is blocked by the first side of the first component on the partition board.
Example 5
The locking mechanism according to example 4, wherein when the external force is applied to the press part of the lock button (121), the spring deformation causes the contact part to move downward, thereby bringing the protrusion part (354) moving downward, so that the first side of the protrusion part (354) leaves away from the blocking range of the first side of the first component.
Example 6
The locking mechanism according to example 4, wherein when the first side of the protrusion part leaves away from the blocking range of the first side of the first component, the slide latch is able to slide a distance, then the external force is removed so that the spring deformation of the spring reaction part is recovered, thus the contact part brings the protrusion part to move upward to another position where the second side of the protrusion part is blocked by the second side of the first component.
Example 7
The locking mechanism according to example 4, wherein the partition board further comprises a second component, a gap is further formed in the contact part of the spring member, when the external force is not applied to the press part of the lock button, the edge of the gap is blocked by the second component.
Example 8
The locking mechanism according to example 4, sliding slots are formed on the partition board, the sliding latch and the spring member are fixed together through the sliding slots, and the sliding latch and the spring member can move relative to the sliding slots, the first component on the partition board is a spacer between the two neighboring sliding slots.
Example 9
A mobile terminal comprising a back housing, wherein the back housing comprising a back housing body and a battery cover,
the locking mechanism according to any one of examples 1-8 is located in one of the back housing body and the battery cover; and
a second snap is formed on the other one of the back housing and the battery cover, for snapping with the snap on the slide latch in the locking mechanism to fix the back housing body and the battery cover together.
Example 10
A method of manufacturing a locking mechanism in a mobile terminal, the locking mechanism comprising a lock button, a slide latch, and spring member, the method comprising:
providing the slide latch, the slide latch may slide between a first position and a second position and comprise a hole and snaps, the hole is on the top of the slide latch and extends through the slide latch, and the snaps are at the front side of the slide latch;

providing the lock button in the hole, the lock button comprising a press part and a support part, the support part being connected to the press part and extending downward from the press part through the hole to be in contact with the contact part on the spring member;

providing the spring member and enabling the spring member to be fixed with the slide latch, the spring member comprising an spring reaction part, a contact part and a protrusion part, the contact part being in contact with the support part of the lock button and a force from the support part causing a spring deformation in the spring reaction part;

when an external force is applied to the press part of the lock button to move the lock button downward, the support part transfers the force to the contact part of the spring member so that the contact part applies the force to the spring reaction part to result in a spring deformation, the spring deformation causes the contact part to move, thereby bringing the protrusion part moving to an unblocked position;

in a case where the protrusion part is not blocked, the slide latch may slide between the first position and the second position for snapping or unsnapping by the snap.

Although present invention is described with limited embodiments, on account of the above descriptions, it may be appreciated by those skilled in the art that other embodiments may be conceived within the scope of the present invention described herein. It may be acknowledged that for sake of clearness some features of the present invention described in the context in a single embodiment may be further provided in a combined manner in a single embodiment. In contrast, for sake of simplicity the features of the present invention described in the context in a single embodiment may be appropriately further provided separately, in any suitable sub-combination, or in any other embodiment of the present invention. No certain features described in the context in the embodiments shall be regarded as the essential features for the embodiments, except that said embodiments are invalid if without those elements.

## Claims

1. A locking mechanism in a mobile terminal, comprising a lock button, a slide latch, a spring member, and a portion of a back housing body:
the slide latch is configured to be slid between a first position and a second position, and the slide latch comprises a hole and at least one snap, the hole is positioned at a top of the slide latch and extends through the slide latch, the at least one snap is positioned at a front side of the slide latch;
the lock button is in the hole and comprises a press part and a support part, the support part being connected to the press part and extending downward from the press part through the hole to be in contact with a contact part of the spring member;
the spring member is mounted to the slide latch and comprises a spring reaction part, the contact part and a protrusion part;
the protrusion part of the spring is movable between a locked position and an unlocked position, and the protrusion part is biased toward the locked position;
the portion of the back housing body is configured to engage the protrusion part of the spring while the protrusion part is in the locked position, so that the portion of the back housing body restricts the slide latch from sliding between the first position and the second position;
the contact part of the spring being in contact with the support part of the lock button so that when a force is provided from the support part to the contact part a spring deformation occurs in the spring reaction part;
the locking mechanism is configured so that when an external force is applied to the press part of the lock button to move the lock button downward, the support part of the lock button transfers the force to the contact part of the spring member so that the contact part applies the force to the spring reaction part to result in a spring deformation, the spring deformation causes the contact part to move, thereby moving the protrusion part relative to the portion of the back housing body into the unlocked position; and
the locking mechanism is configured so that when the protrusion part is in the unlocked position, the slide latch can be slid between the first position and the second position for engaging or disengaging the at least one snap.

2. The locking mechanism according to claim 1, wherein the press button further comprises a fixing part for preventing detachment of the press button from the hole.

3. The locking mechanism according to claim 1, wherein the spring member is made of a spring sheet, and the spring member further comprises a flat part, and the flat part, the spring reaction part, the contact part and the protrusion part are respectively connected to one another.

4. The locking mechanism according to claim 1, wherein the portion of the back housing body is positioned between the spring member and the slide latch, and the locking mechanism is configured so that when no external force is applied to the press part of the lock button, the protrusion part is blocked by a first side of the the portion of the back housing body.

5. The locking mechanism according to claim 4, wherein the locking mechanism is configured so that when the external force is applied to the press part of the lock button, the spring deformation causes the contact part to move downward, thereby causing the protrusion part to move downward, so that a first side of the protrusion part moves away from blocking range of the first side of the portion of the back housing body.

6. The locking mechanism according to claim 5, wherein the locking mechanism is configured so that when the first side of the protrusion part moves away from the blocking range of the first side of the portion of the back housing body, the slide latch is able to slide a distance, then in response to the external force being removed so that the spring deformation of the spring reaction part is reversed, the contact part causes the protrusion part to move upward to another position where a second side of the protrusion part is blocked by a second side of the portion of the back housing body.

7. The locking mechanism according to claim 4, wherein the portion of the back housing body is a first portion of the back housing body, there is a second portion of the back housing body, a gap is formed in the contact part of the spring member, and the locking mechanism is configured so that when the external force is not applied to the press part of the lock button, an edge of the gap is blocked by the second portion of the back housing body.

8. The locking mechanism according to claim 4, wherein a plurality of sliding slots are defined in the back housing body, the spring member is mounted to the slide latch by fasteners that extend through respective sliding slots of the plurality of sliding slots, and the sliding latch and the spring member can move relative to the plurality of sliding slots, the portion of the back housing body is positioned between two adjacent sliding slots of the plurality of sliding slots.

9. A mobile terminal comprising the back housing body and a battery cover, wherein
the locking mechanism according to any one of claims 1-8 is located in the back housing body;
the at least one snap comprises at least one first snap; and
at least one second snap is formed on the battery cover, for engaging with the at least one first snap on the slide latch of the locking mechanism to fix the back housing body and the battery cover together.

10. A method of manufacturing a locking mechanism in a mobile terminal, the locking mechanism comprising a lock button, a slide latch, a spring member, and a portion of a back housing body, the method comprising:
providing the slide latch, the slide latch being configured to be slid between a first position and a second position, and the slide latch comprises a hole and at least one snap, the hole is positioned at a top of the slide latch and extends through the slide latch, and the at least one snap is positioned at a front side of the slide latch;
providing the lock button in the hole, the lock button comprising a press part and a support part, the support part being connected to the press part and extending downward from the press part through the hole to be in contact with a contact part of the spring member; and
providing the spring member so that
the spring member is mounted to the slide latch,
the spring member comprises a spring reaction part, the contact part and a protrusion part,
the protrusion part of the spring is movable between a locked position and an unlocked position, the protrusion part is biased toward the locked position, the portion of the back housing body is configured to engage the protrusion part of the spring while the protrusion part is in the locked position to restrict the slide latch from sliding between the first position and the second position,
the contact part of the spring is in contact with the support part of the lock button so that when a force is provided from the support part to the contact part a spring deformation occurs in the spring reaction part;

wherein the locking mechanism is configured so that when an external force is applied to the press part of the lock button to move the lock button downward, the support part transfers the force to the contact part of the spring member so that the contact part applies the force to the spring reaction part to result in a spring deformation, the spring deformation causes the contact part to move, thereby moving the protrusion part relative to the portion of the back housing body into the unlocked position; and
wherein the locking mechanism is configured so that when the protrusion part is in the unlocked position, the slide latch can be slid between the first position and the second position for engaging or disengaging the at least one snap.