Operating member mechanism with safety lock

By introducing safety locks and anti-drop components into the slide rail assembly, the problem of accidental detachment caused by misoperation of the slide rail assembly operating components is solved, achieving safe and reliable slide rail operation and reducing the risk of damage to electronic devices.

CN224460298UActive Publication Date: 2026-07-03SUZHOU NANJUN TRADING CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SUZHOU NANJUN TRADING CO LTD
Filing Date
2025-02-26
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In the prior art, the operating components of the slide rail assembly are prone to misoperation, which can cause the chassis to fall off unexpectedly and damage the internal electronic devices. In addition, the lack of a foolproof mechanism design can lead to the first rail accidentally retracting or falling off when the operating components are accidentally touched.

Method used

The operating mechanism with a safety lock is adopted, including a first rail, a second rail, an anti-detachment component, an operating component, and a safety lock. The safety lock switches between the first positioning feature and the second positioning feature to prevent the first rail from accidentally detaching. The anti-detachment component is designed to include a left stop, a right stop, and an elastic element. The deformation of the elastic element is used to achieve the limiting function.

Benefits of technology

It effectively prevents the first rail from accidentally falling off due to misoperation, ensures the chassis can slide out or in safely, reduces the risk of damage to electronic devices, and makes operation more reliable and labor-saving.

✦ Generated by Eureka AI based on patent content.

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Abstract

This utility model discloses an operating mechanism with a safety lock, including an anti-detachment component, an operating component, and a safety lock. The anti-detachment component is movably disposed on one side of a first rail and is in an anti-detachment state. The operating component is movably disposed on one side of the first rail. When the operating component is subjected to external force and moves inward or outward from its initial position, the operating component drives the anti-detachment component to switch from the anti-detachment state to a detachable state. The safety lock is disposed on the operating component. By switching between the first positioning feature and the second positioning feature through the safety lock, the operating component can be moved inward or outward and is in a detachable state. When the first rail is pulled out, the stop will not enter the limiting space, so that the first rail can be detached and disassembled to the second rail.
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Description

Technical Field

[0001] This utility model relates to an operating mechanism, and more particularly to an operating mechanism with a safety lock applicable to a slide rail assembly. Background Technology

[0002] In the prior art, the cabinet for placing server-related electronic equipment has layers of removable chassis inside. A slide rail assembly is provided between the chassis and the cabinet to guide the chassis to slide out and into the cabinet. The slide rail assembly consists of a first rail (such as an inner frame), a second rail (such as a middle frame), and a third rail (such as an outer frame). The second rail is located between the first rail and the third rail to extend the displacement stroke of the first rail relative to the third rail. The third rail is fixed to the inner side of the cabinet, and the first rail is installed on the side of the chassis. By utilizing the displacement of the first rail relative to the second rail on the connected third rail, the chassis can be smoothly slid out or into the cabinet.

[0003] When the chassis slides out of the rack, i.e., the first rail extends relative to the second rail to its end of travel, the conventional installation method involves a movable anti-detachment component and an operating component on one side of the first rail. The operating component and the anti-detachment component are connected. When force is applied inward to the operating component, the anti-detachment component moves, causing the first rail to detach from the second rail. Conversely, when force is applied outward to the operating component, the anti-detachment component moves, causing the first rail to retract into the second rail. However, users are prone to operating the operating component incorrectly. For example, if the user intends for the first rail to retract into the second rail, applying force inward to the operating component may cause the first rail to accidentally detach from the second rail, damaging the internal electronic components of the chassis. Furthermore, because there is no foolproof design, accidental activation of the operating component may trigger the anti-detachment component, causing the first rail to accidentally retract or detach from the second rail. Therefore, how to prevent the first rail from accidentally detaching and how to prevent accidental activation of the anti-detachment component when the operating component is accidentally activated are directions that industry professionals urgently need to research and improve. Summary of the Invention

[0004] This utility model provides an operating mechanism with a safety lock, particularly applicable to a slide rail assembly, comprising:

[0005] The system comprises: a first rail and a second rail, the second rail being displaced relative to the first rail, and the first rail having a first positioning feature and a second positioning feature located next to but not adjacent to the first positioning feature; an anti-detachment component movably disposed on one side of the first rail, the anti-detachment component being in an anti-detachment state; an operating member movably disposed on one side of the first rail, which, when subjected to external force, moves inward or outward from an initial position, drives the anti-detachment component to switch from the anti-detachment state to a detachable state; and a safety lock disposed on the operating member, wherein, when the safety lock is subjected to force, it switches between the first positioning feature and the second positioning feature, causing the operating member to move inward or outward.

[0006] Preferably, the anti-fall-off component has a limiting space when not subjected to any external force, and the safety lock has a protruding feature and a switch operation part, and the second rail has a stop member facing the side of the first rail.

[0007] Preferably, when the switch operating part is subjected to force, it switches between the first positioning feature and the second positioning feature through the protruding feature. When the first rail is pulled out and is in the anti-detachment state, the stop will enter the limiting space to prevent the first rail from falling off. When the first rail is pulled out and is in the detachable state, the stop will disengage from the limiting space so that the first rail can be disengaged and detached from the second rail.

[0008] Preferably, the anti-fall-off component includes: a left stop, which is movably disposed on one side of the first rail, and the left stop has a left stop bottom and a left stop top at an opposite position; a right stop, which is movably disposed on one side of the first rail, and the right stop has a right stop bottom and a right stop top at an opposite position; and an elastic member, which is movably disposed on the first rail, and the two ends of the elastic member are respectively connected to the bottom of the left stop and the bottom of the right stop, and the elastic member and the operating member are linked to each other, wherein when the elastic member is not subjected to any external force, the limiting space is formed between the left stop and the right stop.

[0009] Preferably, when the protruding feature is in one of the first positioning feature and the second positioning feature, when force is applied to the switch operating part, the protruding feature moves away from one of the first positioning feature and the second positioning feature, so that the operating part is in an unlocked state. When force is applied to the operating part again, the operating part moves inward, so that the protruding feature enters one of the first positioning feature and the second positioning feature, thereby switching the operating part from the unlocked state to a locked state. At this time, the operating part drives the left stop to move, and the bottom of the left stop is connected to the elastic member to deform elastically, so that the front end of the top of the left stop tilts downward and the rear end of the top of the left stop tilts upward.

[0010] Preferably, when the protruding feature is located in one of the first positioning feature and the second positioning feature, when force is applied to the switch operating part, the protruding feature moves away from one of the first positioning feature and the second positioning feature. At this time, the elastic member elastically resets, and the elastic member moves the bottom of the left stop member, causing the front end of the top of the left stop member to return to its original state upward and the rear end of the top of the left stop member to return to its original state downward. The elastic member also drives the operating member to move to the initial position, so that the protruding feature enters one of the first positioning feature and the second positioning feature, thereby allowing the operating member to return from the unlocked state to the locked state.

[0011] Preferably, when the front end of the top of the left stop is tilted downward and the rear end of the top of the left stop is tilted upward, when the first rail is subjected to force, the first rail will continue to move outward, and the stop will not enter the limiting space, so that the first rail can be detached and disassembled from the second rail.

[0012] Preferably, the switch operating part is a pressing body located on the front of the safety lock, and the protruding part is a latching body located on the back of the safety lock, and the first positioning feature and the second positioning feature are respectively a first positioning hole and a second positioning hole.

[0013] Preferably, the safety lock has an elongated through hole at each end, through which multiple fasteners pass to pivotally connect the safety lock to the operating member. The switch operating part is a protrusion located on the front of the safety lock, and the protrusion is a stop. The first positioning feature and the second positioning feature are a first positioning groove and a second positioning groove, respectively, which pass through the protrusion of the safety lock to limit or release the movement of the operating member relative to the first rail inward or outward.

[0014] Preferably, both the first positioning groove and the second positioning groove are U-shaped, and the first positioning groove and the second positioning groove are integrally formed positioning structures, which are disposed on the first rail. Attached Figure Description

[0015] Figure 1 This is an exploded perspective view of the first embodiment of the present invention.

[0016] Figure 2 This is another exploded perspective view of the first embodiment of the present invention.

[0017] Figure 3 This is a schematic diagram of a safety lock according to the first embodiment of the present invention.

[0018] Figure 4 This is another schematic diagram of the safety lock according to the first embodiment of the present invention.

[0019] Figure 5A This is a schematic diagram of the operation of the first embodiment of the present invention.

[0020] Figure 5B This is another schematic diagram of the operation of the first embodiment of the present utility model.

[0021] Figure 5C This is another schematic diagram of the first embodiment of the present utility model.

[0022] Figure 6 This is an exploded perspective view of the second embodiment of the present invention.

[0023] Figure 7 This is another exploded perspective view of the second embodiment of the present invention.

[0024] Figure 8 This is a schematic diagram of a safety lock according to the second embodiment of the present invention.

[0025] Figure 9 This is another schematic diagram of the safety lock according to the second embodiment of the present invention.

[0026] Figure 10A This is a schematic diagram of the second embodiment of the present invention.

[0027] Figure 10B This is a cross-sectional view of the second embodiment of the present invention.

[0028] Figure 11A This is a schematic diagram of another action in the second embodiment of the present invention.

[0029] Figure 11B This is another sectional view of the second embodiment of the present invention.

[0030] Figure 12 This is a schematic diagram of the initial state of the left and right stops of this utility model.

[0031] Figure 13 This is another schematic diagram showing the initial state of the left and right stops of this utility model.

[0032] Figure 14 This is a schematic diagram showing the operating states of the left and right stops of this utility model.

[0033] Figure 15 This is another schematic diagram showing the operating states of the left and right stops of this utility model.

[0034] In the figure, the reference numerals include:

[0035] 100: Operating mechanism with safety lock

[0036] 110: Track 1

[0037] 112: First localization feature

[0038] 112A: First positioning hole

[0039] 112B: First positioning slot

[0040] 114: Second localization feature

[0041] 114A: Second positioning hole

[0042] 114B: Second positioning groove

[0043] 115: Positioning Structure

[0044] 120: Left stop

[0045] 121: Bottom of left stop

[0046] 122: Top of left stop

[0047] 130: Right block

[0048] 131: Bottom of right stop

[0049] 132: Top of right stop

[0050] 140: Elastic element

[0051] 150: Operating components

[0052] 160: Safety Lock

[0053] 161: Features of the protruding part

[0054] 161A: Buckle body

[0055] 161B: Stop body

[0056] 162: Switch Operating Section

[0057] 162A: Pressing Body

[0058] 162B: Bump

[0059] 163: Long through hole

[0060] 170: Track 2

[0061] 171: Stop

[0062] 180: Outer frame

[0063] ATC: Anti-drop component

[0064] FT: Fasteners

[0065] DS: Limiting Space Detailed Implementation

[0066] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0067] Example

[0068] Please refer to Figures 1 to 5 and Figures 12 to 15. This utility model relates to an operating mechanism 100 with a safety lock, particularly suitable for a slide rail assembly, comprising: a first rail 110, a second rail 170, a third rail 180, an anti-fall-off component (ATC), an operating element 150, and a safety lock 160. The first rail 110 is displaced relative to the second rail 170, and the first rail 110 has a first positioning feature 112 and a second positioning feature 114. The second positioning feature is located beside but not adjacent to the first positioning feature. The second rail 170 extends the first rail 110. The first rail 110 has a displacement stroke relative to the second rail 170. The second rail 170 has a stop 171 facing the side of the first rail 110, and the second rail 170 has a displacement stroke relative to the third rail 180. The anti-detachment component ATC is movably disposed on one side of the first rail 110. The anti-detachment component ATC has a limiting space DS when not subjected to any external force. The anti-detachment component ATC is used to keep the first rail 110 in an anti-detachment state relative to the second rail 170. The operating member 150 is movably disposed on one side of the first rail 110. When the operating member 150 is subjected to force, it moves away from the first rail 110. When the initial position moves inward or outward, the operating member 150 activates the anti-detachment assembly (ATC), causing the first rail 110 relative to the second rail 170 to switch from the anti-detachment state to a detachable state. A safety lock 160 is disposed on the operating member 150. The safety lock 160 has a protruding feature 161 and a switch operation part 162. The protruding feature 161 of the safety lock 160 switches between the first positioning feature 112 and the second positioning feature 114, causing the operating member 150 to move inward or outward. While in the anti-detachment state, when the first rail 110 is pulled out... When the first rail 110 is pulled out, the stop 171 will enter the limiting space DS to prevent the first rail 110 from falling off. That is to say, the stop 171 has the function of limiting the movement of the first rail 110. In addition, when the first rail 110 is pulled out in the detachable state, the stop 171 will not enter the limiting space DS, so that the first rail 110 can be detached from the second rail 170 and removed. It should be noted that when the protrusion feature 161 of the safety lock 160 is located in one of the first positioning feature 112 and the second positioning feature 114, it is used to limit the movement of the operating member 150.

[0069] Please refer to Figures 1-2, 6-7, and 12-15. The anti-detachment assembly (ATC) includes: a left stop 120, a right stop 130, and an elastic member 140. The left stop 120 is movably disposed on one side of the first rail 110 and has a left stop bottom 121 and a left stop top 122 positioned opposite to it. The right stop 130 is movably disposed on one side of the first rail 110 and has a... The bottom 131 of the right stop and the top 132 of the opposite right stop are connected by an elastic member 140 which is movably disposed on one side of the first rail 110. The two ends of the elastic member 140 are respectively connected to the bottom 121 of the left stop and the bottom 131 of the right stop. Those skilled in the art should understand that the elastic member 140 and the operating member 150 are interconnected. When the elastic member 140 is not subjected to any external force, the limiting space DS is formed between the left stop 120 and the right stop 130.

[0070] Continuing from the above, when the protruding feature 161 is in the state of the first positioning feature 112, applying force to the switch operation part 162 will cause the protruding feature 161 to move away from the first positioning feature 112, thus putting the operation member 150 in an unlocked state. When force is applied to the operation member 150 again, the operation member 150 can move inward, allowing the protruding feature 161 to enter the second positioning feature 114, thereby changing the operation member 150 from the unlocked state to a locked state. At this time, the elastic member 140 elastically deforms, and the front end of the top 122 of the left stop 120 tilts downward, while the rear end of the top 122 of the left stop 120 tilts upward (close to the upper edge of the first rail 110), as shown in Figures 14 and 15. At this time, the operator does not need to continuously apply force to the switch operation part 162 and the operation member 150 of the safety lock 160, and can easily lock the lock. When the first rail 110 is detached from and disassembled outside the second rail 170, and when the protruding feature 161 is located at the second positioning feature 114, when force is applied to the switch operation part 162, the protruding feature 161 moves away from the second positioning feature 114. At this time, the elastic member 140 elastically resets, and the front end of the left stop 120's top 122 returns to its original state upward, and the rear end of the left stop 120's top 122 returns to its original state downward, as shown in Figures 12 and 13. The elastic member 140 also drives the operation member 150 to return from the locked state to the unlocked state, and the operation member 150 returns to its initial position so that the protruding feature 161 switches back to the first positioning feature 112, thereby allowing the operation member 150 to switch from the unlocked state back to the locked state. When force is applied to the operation member 150 again, the operation member 150 cannot move inward.

[0071] Furthermore, as described in the above paragraph, when the operating mechanism 100 with the safety lock is in the second locked state, that is, when the front end of the top 122 of the left stop 120 is tilted downward and the rear end of the top 122 of the left stop 120 is tilted upward (close to the upper edge of the first rail 110), when force is applied to the first rail 110, the first rail 110 moves outward and continues, and the stop 171 will not enter the limiting space DS, so that the first rail 110 can be detached and disassembled from the second rail 170, that is, the first rail 110 can be removed from the slide rail assembly.

[0072] The anti-detachment component ATC of this utility model is understood by those skilled in the art. In actual operation, the first rail 110 is connected to a server chassis (not shown in the figure). When the server chassis is pulled out or pushed back, the first rail 110 moves in conjunction with the server chassis. The structure, displacement, unfolding and retraction of the first rail 110, the second rail 170 and the third rail 180 are already known technologies and will not be described in detail here for the sake of simplicity.

[0073] The first and second embodiments will be further described below to provide a detailed understanding of the operating mechanism 100 with a safety lock of this utility model.

[0074] In the first embodiment of this utility model, the switch operation part 162 is a pressing body 162A, which is located on the front of the safety lock 160, and the protruding feature 161 is a buckle 161A, which is located on the back of the safety lock 160, and the first positioning feature 112 is a first positioning hole 112A, and the second positioning feature 114 is a second positioning hole 114A. The operating mechanism of the first embodiment is as described above and will not be repeated here.

[0075] Please refer to Figures 6 through 15. In the second embodiment of this utility model, the safety lock 160 has an elongated through hole 163 at each end, and multiple fixing members FT pass through these elongated through holes 163, allowing the safety lock 160 to be movably pivotally connected to the operating member 150. The switch operating part 162 is a protrusion 162B, which is located on the front of the safety lock 160. The protruding feature 161 is a stop body 161B, and the first positioning feature 112 and the second positioning feature 114 are respectively a first positioning groove 112B and a second positioning groove 114. The first positioning groove 112B and the second positioning groove 114B are both U-shaped. The first positioning groove 112B and the second positioning groove 114B are integrally formed into a positioning structure 115. The positioning structure 115 is disposed on the first rail 110, as shown in Figures 10A to 11B. Specifically, when the stop body 161B is located in one of the first positioning groove 112B and the second positioning groove 114B, after applying force downward to the protrusion 162B of the safety lock 160, the fixing members FT respectively exit from the elongated through holes 163. When the lower part of the oblong through-hole 163 is switched to the upper part, the fixing members FT switch from the lower part of the oblong through-hole 163 to the upper part, causing the stop body 161B to leave the first positioning groove 112B or the second positioning groove 114B, so that the operating member 150 is in the unlocked state. When force is applied to the operating member 150, the operating member 150 moves inward or to the initial position. On the other hand, after the operating member 150 has moved inward or to the initial position, when the protrusion 16 of the safety lock 160 is... When force is applied upwards to 2B, the fixing members FT switch from above the elongated through holes 163 to below them. After the fixing members FT switch from above the elongated through holes 163 to below them, the stop body 161B enters the first positioning groove 112B or the second positioning groove 114B. The operating member 150 switches from the unlocked state to the locked state to limit the movement of the operating member 150 in the initial position. Other cooperating structures or components are as described above and will not be repeated here.

[0076] In view of this, the operating mechanism 100 with a safety lock disclosed in this utility model switches between the first positioning feature 112 and the second positioning feature 114 through the safety lock 160 to limit the inward or outward movement of the operating member 150. This has the effect of preventing accidental activation of the operating member 150 and the activation of the anti-detachment component ATC, and helps the operator to operate with confidence and effort and to easily remove the first rail 110 from the slide rail assembly.

[0077] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Therefore, all equivalent variations or modifications made in accordance with the features and spirit described in the scope of this utility model should be included within the patent scope of this utility model.

Claims

1. A handle mechanism with a safety lock, particularly for a slide assembly, characterized in that, include: A first track (110) and a second track (170), the second track (170) being displaced relative to the first track (110), and the first track (110) having a first positioning feature (112) and a second positioning feature (114) located next to but not adjacent to the first positioning feature (112). An anti-detachment component (ATC) is movably disposed on one side of the first rail (110), and the anti-detachment component (ATC) is in an anti-detachment state; An operating element (150) is movably disposed on one side of the first rail (110). When the operating element (150) is subjected to force and moves inward or outward from an initial position, it drives the anti-detachment assembly (ATC) to switch from the anti-detachment state to a detachable state; and A safety lock (160) is disposed on the operating member (150), wherein when the safety lock (160) is subjected to force, it switches between the first positioning feature (112) and the second positioning feature (114) through the safety lock (160), causing the operating member (150) to move inward or outward.

2. The operating member mechanism with a safety lock according to claim 1, characterized in that, The anti-drop component (ATC) has a limiting space (DS) when not subjected to any external force, and the safety lock (160) has a protruding feature (161) and a switch operation part (162), and the second rail (170) has a stop (171) facing the side of the first rail (110).

3. The operating member mechanism with a safety lock according to claim 2, characterized in that, When the switch operation part (162) is subjected to force, it switches between the first positioning feature (112) and the second positioning feature (114) through the protrusion feature (161). When the first rail (110) is pulled out and is in the anti-detachment state, the stop (171) will enter the limiting space (DS) to prevent the first rail (110) from falling off. When the first rail (110) is pulled out and is in the detachable state, the stop (171) will disengage from the limiting space (DS) so that the first rail (110) can be disengaged and detached from the second rail (170).

4. The operating member mechanism with a safety lock according to claim 2, characterized by The anti-fall-off component (ATC) includes: A left stop (120) is movably disposed on one side of the first rail (110), and the left stop (120) has a left stop bottom (121) and a left stop top (122) in a opposite position. A right stop (130) is movably disposed on one side of the first rail (110), and the right stop (130) has a right stop bottom (131) and a right stop top (132) in a opposite position; and An elastic element (140) is provided, with its two ends connected to the bottom of the left stop (121) and the bottom of the right stop (131) respectively. The elastic element (140) and the operating element (150) are linked together. When the elastic element (140) is not subjected to any external force, the limiting space (DS) is formed between the left stop (120) and the right stop (130).

5. The operating member mechanism with a safety lock according to claim 4, characterized in that, When the protruding feature (161) is positioned between the first positioning feature (112) and the second positioning feature (114), force is applied to the switch operating part (162), causing the protruding feature (161) to move away from either the first positioning feature (112) or the second positioning feature (114), thus unlocking the operating member (150). Then, force is applied to the operating member (150), causing it to move inwards, thus unlocking the switch. The protruding feature (161) enters one of the first positioning feature (112) and the second positioning feature (114), thereby causing the operating member (150) to switch from the unlocked state to a locked state. At this time, the operating member (150) drives the left stop (120) to move. The bottom (121) of the left stop is linked to the elastic member (140) to deform elastically, causing the front end of the top (122) of the left stop to tilt downward and the rear end of the top (122) of the left stop to tilt upward.

6. The operating member mechanism with a safety lock according to claim 5, characterized in that, When the protruding feature (161) is located in one of the first positioning feature (112) and the second positioning feature (114), force is applied to the switch operation part (162), and the protruding feature (161) moves away from one of the first positioning feature (112) and the second positioning feature (114). At this time, the elastic member (140) elastically resets, and the elastic member (140) moves the bottom of the left stop (121), so that the front end of the top (122) of the left stop returns to its original state upward, and the rear end of the top (122) of the left stop returns to its original state downward. The elastic member (140) drives the operation member (150) to move to the initial position, so that the protruding feature (161) enters one of the first positioning feature (112) and the second positioning feature (114), thereby allowing the operation member (150) to return from the unlocked state to the locked state.

7. The operating member mechanism with a safety lock according to claim 4, characterized by When the front end of the top (122) of the left stop is tilted downward and the rear end of the top (122) of the left stop is tilted upward, when the first rail (110) is subjected to force, the first rail (110) will continue to move outward, and the stop (171) will not enter the limiting space (DS), so that the first rail (110) can be detached and disassembled from the second rail (170).

8. The operating member mechanism with a safety lock according to claim 2, wherein The switch operation part (162) is a pressing body (162A), which is located on the front of the safety lock (160), and the protruding feature (161) is a buckle (161A), which is located on the back of the safety lock (160), and the first positioning feature (112) and the second positioning feature (114) are respectively a first positioning hole (112A) and a second positioning hole (114A).

9. The operating member mechanism with a safety lock according to claim 8, characterized in that, The safety lock (160) has an elongated through hole (163) at each end. The elongated through holes (163) are respectively provided through multiple fasteners (FT) to pivotally connect the safety lock (160) to the operating member (150). The switch operating part (162) is a protrusion (162B). The protrusion (162B) is located on the front of the safety lock (160). The protruding feature (161) is a stop body (161B). The first positioning feature (112) and the second positioning feature (114) are a first positioning groove (112B) and a second positioning groove (114B) respectively. They pass through the protrusion (162B) of the safety lock (160) to limit or release the movement of the operating member (150) relative to the first rail (110) to the inward or outward side.

10. The operating member mechanism with a safety lock according to claim 9, characterized in that, Both the first positioning groove (112B) and the second positioning groove (114B) are U-shaped. The first positioning groove (112B) and the second positioning groove (114B) are integrally formed positioning structures (115), and the positioning structures (115) are disposed on the first rail (110).