Tool trolley with locking mechanism
By designing a locking mechanism and a multi-point synchronous locking fixture on the tooling trolley, the problems of the tooling trolley sliding at a designated position and damaging the workpiece during clamping are solved, achieving the effect of stable locking and efficient clamping.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGZHOU JVCI AUTOMATION EQUIP CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-04-17
AI Technical Summary
Existing tooling trolleys are prone to slipping when moving to designated positions, posing safety hazards. They also have poor versatility, are complex to operate, have low clamping efficiency, and the clamping device may damage the workpiece.
A tooling trolley with a locking mechanism is designed, including a flip locking mechanism, a lifting and moving locking mechanism, a front limit component and a rear limit component. The flip locking mechanism and the lifting and moving locking mechanism lock the end and middle of the trolley frame, while the front limit component and the rear limit component restrict the forward and backward movement of the trolley frame. A tooling fixture with multi-point synchronous locking is used, and the workpiece is protected by a pressure sensor and a wear-resistant rubber sleeve.
It achieves stable locking of the tooling trolley in the designated position, eliminates safety hazards, improves versatility and clamping efficiency, and protects the workpiece from damage.
Smart Images
Figure CN224131117U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of tooling trolley technology, specifically to a tooling trolley with a locking mechanism. Background Technology
[0002] In industries such as automobile manufacturing and home appliance production, the demand for storage and transfer of parts and assemblies is enormous. Traditional manual handling methods are labor-intensive, inefficient, and prone to damaging goods. For example, in automobile manufacturing, manually handling seat assemblies can cause scratches or deformation due to improper operation. Tooling trolleys, as specialized turnover equipment, can efficiently carry and move various parts, ensuring the continuity of the production process. For example, automobile assembly lines require frequent handling of large components such as engines and seats; tooling trolleys, through standardized design, enable rapid loading and unloading, significantly improving production efficiency.
[0003] The existing tooling trolleys have the following shortcomings: First, although the tooling trolleys are easy to move because they are equipped with wheels, they are prone to slippage when the workpiece is moved after the tooling trolley reaches the designated position, which poses certain safety hazards; second, they have poor compatibility with general handling equipment; third, they are complicated to operate and have low clamping efficiency; and fourth, the workpiece locking device may sometimes damage the workpiece when locking it. Utility Model Content
[0004] The purpose of this utility model is to provide a tooling trolley with a locking mechanism that is quick, safe and reliable in locking.
[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:
[0006] A tooling trolley with a locking mechanism includes a frame and a locking mechanism. The locking mechanism includes a flip locking mechanism, a front limiting component, a rear limiting component, and a lifting and moving locking mechanism. The flip locking mechanism is used to lock one end of the frame, the lifting and moving locking mechanism is used to lock the middle of the frame, and the front limiting component and the rear limiting component are used to limit the forward and backward movement of the frame, respectively.
[0007] Furthermore, the flipping locking mechanism includes a fixed frame, a fixed clamping body, a movable clamping body, a rotating arm, and a flipping drive device. The fixed frame is a gantry-type fixed frame, and the flipping drive device is mounted on the fixed frame. The fixed clamping body is located on the fixed frame, and the movable clamping body is located at one end of the rotating arm. The other end of the rotating arm is fixedly connected to the output shaft of the flipping drive device. The flipping drive device drives the rotating arm to rotate, and the rotating arm drives the movable clamping body to flip upward until the movable clamping body and the fixed clamping body together clamp and lock the crossbeam of the frame.
[0008] Furthermore, the lifting and moving locking mechanism includes a fixed base, a lifting drive device, a vertical guide rail, a lifting slider, a locking plug, a locking groove, and a fixed plate. The locking groove is fixed at the center hole of the fixed plate, the fixed plate is located in the middle of the vehicle frame, and the locking plug is located on the lifting slider. The lifting drive device drives the lifting slider to rise along the vertical guide rail and inserts the locking plug into the locking groove to lock the vehicle frame.
[0009] Furthermore, the front limiting assembly and the rear limiting assembly have the same structure. The rear limiting assembly includes a rear limiting seat and a rear limiting rod. The rear limiting rod is laterally fixed on the rear limiting seat and is parallel to the front limiting rod in the front limiting assembly. One end of the rear limiting rod and one end of the front limiting rod expand outward to form a flared opening, which is the frame entry point.
[0010] Furthermore, the top of the vehicle frame is provided with a tooling table, and tooling fixtures are provided on the tooling table.
[0011] Furthermore, the tooling fixture includes a driving device, a transmission mechanism, a first clamping body, a second clamping body, a third clamping body, a first sliding mechanism, a second sliding mechanism, and a third sliding mechanism. The driving device drives the first sliding mechanism, the second sliding mechanism, and the third sliding mechanism to move synchronously through the transmission mechanism. The first sliding mechanism, the second sliding mechanism, and the third sliding mechanism respectively drive the first clamping body, the second clamping body, and the third clamping body to move, so as to lock and fix the workpiece at multiple points synchronously through the first clamping body, the second clamping body, and the third clamping body. The first sliding mechanism includes a longitudinal guide rail and a longitudinal slider. The longitudinal slider is mounted on the longitudinal guide rail and can slide along the longitudinal guide rail. The first clamping body is mounted on the longitudinal slider. The second sliding mechanism includes a left transverse guide rail and a left transverse slider. The third sliding mechanism includes a right transverse guide rail and a right transverse slider. The left transverse guide rail and the right transverse guide rail are mounted on the tooling table and are located on the same straight line. The second clamping body and the third clamping body are respectively mounted on the left transverse slider and the right transverse slider. The left transverse slider and the right transverse slider are respectively mounted on the left transverse guide rail and the right transverse guide rail. The left transverse guide rail and the right transverse guide rail are located on both sides of the longitudinal guide rail and are perpendicular to the longitudinal guide rail.
[0012] Furthermore, the first clamping body, the second clamping body, and the third clamping body have the same structure. The second clamping body includes a support base and a clamping member. The clamping member is laterally fixed on the support base, and the support base is located on the left lateral slider of the second sliding mechanism.
[0013] Furthermore, the transmission mechanism includes a left transmission plate, a right transmission plate, a left transmission column, and a right transmission column. The left transmission plate and the right transmission plate are respectively provided with a left elongated hole and a right elongated hole. One end of the left transmission plate and the right transmission plate is fixed on the longitudinal slider. The left elongated hole on the left transmission plate and the right elongated hole on the right transmission plate are respectively inserted into the left transmission column and the right transmission column and can slide relative to the left transmission column and the right transmission column. The left transmission column and the right transmission column are respectively erected on the left transverse slider and the right transverse slider. The left transmission plate and the right transmission plate form an eight-shaped structure.
[0014] Furthermore, the driving device directly drives the longitudinal slider to slide along the longitudinal guide rail, and the longitudinal slider simultaneously drives the left and right transverse sliders to move through the left and right transmission plates respectively.
[0015] Furthermore, the clamping component includes a clamping block, a pressure sensor, a spring, a clamping rod, and a retaining ring. The side wall of the clamping block has a mounting hole and a lead wire hole. The pressure sensor is installed at the bottom of the mounting hole, and the data line on the pressure sensor passes through the lead wire hole and is electrically connected to the controller. The clamping rod is inserted into the mounting hole, and the spring is installed in the mounting hole and located between the clamping rod and the pressure sensor. The clamping rod has a limiting boss. The retaining ring is fixed to the mounting hole on the clamping block by screws. The clamping end of the clamping rod extends out of the clamping block through the retaining ring. The retaining ring is used to block the limiting boss on the clamping rod to prevent the clamping rod from disengaging from the mounting hole.
[0016] The beneficial effects of this utility model are as follows:
[0017] This application adds a locking mechanism to the tooling trolley at a designated location. When the workpiece is moved, the tooling trolley is locked, making the tooling trolley more stable and eliminating potential safety hazards. It has the characteristics of quick, safe and reliable locking.
[0018] This application improves the tooling fixtures of the tooling trolley, greatly enhancing its adaptability to different workpieces and thus improving the versatility of the tooling trolley. At the same time, it adopts a multi-point synchronous locking method, which only requires one drive device to achieve multi-point synchronous locking, and features convenient operation and high clamping efficiency.
[0019] This application also improves the clamping component. When the clamping rod clamps the workpiece, the clamping rod retracts, and the pressure sensor transmits the pressure to the controller. When the clamping force of the clamping rod on the workpiece reaches the preset value, the controller shuts off the drive device to prevent the drive device from continuing to work and damaging the workpiece. In addition, a wear-resistant rubber sleeve is fitted on the clamping end of the clamping rod to prevent the clamping rod from wearing. Attached Figure Description
[0020] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort:
[0021] Figure 1 This is a schematic diagram of the structure of this utility model;
[0022] Figure 2 for Figure 1 The diagram shows the structure of the locking mechanism.
[0023] Figure 3 for Figure 2 The 3D diagram shown;
[0024] Figure 4 for Figure 1 The diagram shows the structure of the tooling fixture.
[0025] Figure 5 for Figure 4 The 3D diagram shown;
[0026] Figure 6 for Figure 5 The diagram shows the structure of the clamping component.
[0027] In the diagram: 1. Drive unit; 2. First clamping body; 3. Second clamping body; 4. Third clamping body; 5. First sliding mechanism; 6. Second sliding mechanism; 7. Third sliding mechanism; 8. Tooling table; 9. Left transmission plate; 10. Right transmission plate; 11. Left transmission column; 12. Right transmission column; 13. Left elongated hole; 14. Right elongated hole; 15. Clamping block; 16. Pressure sensor; 17. Spring; 18. Clamping rod; 19. Retaining ring; 20. Mounting hole; 21. Lead wire hole; 22. Limiting boss; 23. Wear-resistant rubber sleeve; 24. Data cable; 25. Screw; 26. Locking mechanism; 27. Lifting and moving locking mechanism; 28. Flip locking mechanism. Mechanism; 29. Front limit assembly; 30. Rear limit assembly; 31. Support seat; 32. Clamping component; 33. Frame; 34. Fixed frame; 35. Fixed clamping body; 36. Movable clamping body; 37. Tilting drive device; 38. Fixed seat; 39. Lifting drive device; 40. Vertical guide rail; 41. Lifting slider; 42. Locking plug; 43. Locking groove; 44. Fixed plate; 45. Rear limit seat; 46. Rear limit rod; 47. Front limit rod; 48. Tooling fixture; 49. Rotating arm; 51. Longitudinal guide rail; 52. Longitudinal slider; 61. Left transverse guide rail; 62. Left transverse slider; 71. Right transverse guide rail; 72. Right transverse slider. Detailed Implementation
[0028] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other.
[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper surface", "lower surface", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "forward", "reverse", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0030] like Figure 1 , 2 As shown, a tooling trolley with a locking mechanism includes a frame 33 and a locking mechanism 26. The locking mechanism 26 includes a flip locking mechanism 28, a front limiting component 29, a rear limiting component 30, and a lifting and moving locking mechanism 27. The flip locking mechanism 28 is used to lock one end of the frame 33, the lifting and moving locking mechanism 27 is used to lock the middle part of the frame 33, and the front limiting component 29 and the rear limiting component 30 are used to limit the forward and backward movement of the frame 33, respectively.
[0031] like Figure 3 As shown, the flipping locking mechanism 28 includes a fixed frame 34, a fixed clamping body 35, a movable clamping body 36, a rotating arm 49, and a flipping drive device 37. The fixed frame 34 is a gantry-type fixed frame. The flipping drive device 37 is mounted on the fixed frame 34. The fixed clamping body 35 is located on the fixed frame 34. The movable clamping body 36 is located at one end of the rotating arm 49. The other end of the rotating arm 49 is fixedly connected to the output shaft of the flipping drive device 37. The flipping drive device 37 drives the rotating arm 49 to rotate. The rotating arm 49 drives the movable clamping body 36 to flip upward until the movable clamping body 36 and the fixed clamping body 35 together clamp and lock the crossbeam of the frame 33.
[0032] The lifting and moving locking mechanism 27 includes a fixed base 38, a lifting drive device 39, a vertical guide rail 40, a lifting slider 41, a locking plug 42, a locking groove 43, and a fixing plate 44. The locking groove 43 is fixed at the center hole of the fixing plate 44. The fixing plate 44 is located in the middle of the frame 33. The locking plug 42 is located on the lifting slider 41. The lifting drive device 39 drives the lifting slider 41 to rise along the vertical guide rail 40 and inserts the locking plug 42 into the locking groove 43 to lock the frame 33.
[0033] The front limiting assembly 29 and the rear limiting assembly 30 have the same structure. The rear limiting assembly 30 includes a rear limiting seat 45 and a rear limiting rod 46. The rear limiting rod 46 is laterally fixed on the rear limiting seat 45 and is parallel to the front limiting rod 47 in the front limiting assembly 29. One end of the rear limiting rod 46 and one end of the front limiting rod 47 expand outward to form a flared opening, which is the frame entry opening.
[0034] The top of the frame 33 is provided with a tooling table 8, and the tooling table 8 is provided with a tooling fixture 48.
[0035] like Figure 1 , 2 As shown, the tooling fixture 48 includes a driving device 1, a transmission mechanism, a first clamping body 2, a second clamping body 3, a third clamping body 4, a first sliding mechanism 5, a second sliding mechanism 6, and a third sliding mechanism 7. The driving device 1 drives the first sliding mechanism 5, the second sliding mechanism 6, and the third sliding mechanism 7 to move synchronously through the transmission mechanism. The first sliding mechanism 5, the second sliding mechanism 6, and the third sliding mechanism 7 respectively drive the first clamping body 2, the second clamping body 3, and the third clamping body 4 to move, so as to lock and fix the workpiece at multiple points synchronously through the first clamping body 2, the second clamping body 3, and the third clamping body 4.
[0036] The first sliding mechanism 5 includes a longitudinal guide rail 51 and a longitudinal slider 52. The longitudinal slider 52 is disposed on the longitudinal guide rail 51 and can slide along the longitudinal guide rail 51. The first clamping body 2 is disposed on the longitudinal slider 52.
[0037] The second sliding mechanism 6 includes a left transverse guide rail 61 and a left transverse slider 62; the third sliding mechanism 7 includes a right transverse guide rail 71 and a right transverse slider 72. The left transverse guide rail 61 and the right transverse guide rail 71 are provided on the tooling table 8 and are located on the same straight line. The second clamping body 3 and the third clamping body 4 are respectively provided on the left transverse slider 62 and the right transverse slider 72. The left transverse slider 62 and the right transverse slider 72 are respectively provided on the left transverse guide rail 61 and the right transverse guide rail 71. The left transverse guide rail 61 and the right transverse guide rail 71 are provided on both sides of the longitudinal guide rail 51 and are perpendicular to the longitudinal guide rail 51.
[0038] The transmission mechanism includes a left transmission plate 9, a right transmission plate 10, a left transmission column 11, and a right transmission column 12. The left transmission plate 9 and the right transmission plate 10 are curved plate structures, and the included angle at the bend of the left transmission plate 9 and the right transmission plate 10 is greater than 90°. The left transmission plate 9 and the right transmission plate 10 are respectively provided with a left elongated hole 13 and a right elongated hole 14. One end of the left transmission plate 9 and the right transmission plate 10 is fixed on the longitudinal slider 52. The left elongated hole 13 on the left transmission plate 9 and the right elongated hole 14 on the right transmission plate 10 are respectively inserted into the left transmission column 11 and the right transmission column 12 and can slide relative to the left transmission column 11 and the right transmission column 12. The left transmission column 11 and the right transmission column 12 are respectively erected on the left transverse slider 62 and the right transverse slider 72. The left transmission plate 9 and the right transmission plate 10 are assembled into a figure-eight structure.
[0039] The driving device 1 directly drives the longitudinal slider 52 to slide along the longitudinal guide rail 51. The longitudinal slider 52 simultaneously drives the left transverse slider 62 and the right transverse slider 72 to move through the left transmission plate 9 and the right transmission plate 10, respectively.
[0040] In this embodiment, the driving device 1 includes a motor and a rocker arm mechanism, with the motor driving the longitudinal slider to move via the rocker arm mechanism. Of course, the driving device can also be an electric push rod or a cylinder.
[0041] The first clamping body 2, the second clamping body 3, and the third clamping body 4 have the same structure. The second clamping body 3 includes a support base 31 and a clamping member 32. The clamping member 32 is laterally fixed on the support base 31, and the support base 31 is disposed on the left transverse slider 62 of the second sliding mechanism. The workpiece is pressed against the end of the clamping member 32.
[0042] like Figure 3 As shown, the clamping component 32 includes a clamping block 15, a pressure sensor 16, a spring 17, a clamping rod 18, and a retaining ring 19. The clamping block 15 has a mounting hole 20 and a lead wire hole 21 on its side wall. The pressure sensor 16 is installed at the bottom of the mounting hole 20. The data line 24 on the pressure sensor 16 passes through the lead wire hole 21 and is electrically connected to the controller. The clamping rod 18 is inserted into the mounting hole 20. The spring 17 is installed in the mounting hole 20 and is located between the clamping rod 18 and the pressure sensor 16. The clamping rod 18 has a limiting boss 22. The retaining ring 19 is fixed to the mounting hole 20 on the clamping block 15 by screws 25. The clamping end of the clamping rod 18 extends out of the clamping block 15 through the retaining ring 19. The retaining ring 19 is used to block the limiting boss 22 on the clamping rod 18 to prevent the clamping rod 18 from disengaging from the mounting hole 20. When the clamping rod 18 clamps the workpiece, the clamping rod 18 retracts, and the pressure sensor 16 transmits the pressure to the controller. When the clamping force of the clamping rod 18 on the workpiece reaches the preset value, the controller shuts off the drive device 1 to prevent the drive device 1 from continuing to work and damaging the workpiece.
[0043] The clamping end of the clamping rod 18 is fitted with a wear-resistant rubber sleeve 23. The function of the wear-resistant rubber sleeve 23 is to prevent the clamping rod from wearing out.
[0044] Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those embodiments or examples, without contradiction. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.
Claims
1. A tooling dolly with a locking mechanism, characterized by: The device includes a frame and a locking mechanism. The locking mechanism includes a flip locking mechanism, a front limiting component, a rear limiting component, and a lifting and moving locking mechanism. The flip locking mechanism is used to lock one end of the frame, the lifting and moving locking mechanism is used to lock the middle of the frame, and the front limiting component and the rear limiting component are used to limit the forward and backward movement of the frame, respectively.
2. The tooling dolly with locking mechanism of claim 1, wherein: The flipping locking mechanism includes a fixed frame, a fixed clamping body, a movable clamping body, a rotating arm, and a flipping drive device. The fixed frame is a gantry-type fixed frame. The flipping drive device is mounted on the fixed frame. The fixed clamping body is located on the fixed frame. The movable clamping body is located at one end of the rotating arm. The other end of the rotating arm is fixedly connected to the output shaft of the flipping drive device. The flipping drive device drives the rotating arm to rotate, and the rotating arm drives the movable clamping body to flip upward until the movable clamping body and the fixed clamping body together clamp and lock the crossbeam of the frame.
3. The tooling dolly with locking mechanism of claim 2, wherein: The lifting and moving locking mechanism includes a fixed base, a lifting drive device, a vertical guide rail, a lifting slider, a locking plug, a locking slot, and a fixed plate. The locking slot is fixed at the center hole of the fixed plate, the fixed plate is located in the middle of the vehicle frame, and the locking plug is located on the lifting slider. The lifting drive device drives the lifting slider to rise along the vertical guide rail and inserts the locking plug into the locking slot to lock the vehicle frame.
4. The tooling dolly with locking mechanism of claim 3, wherein: The front limiting assembly and the rear limiting assembly have the same structure. The rear limiting assembly includes a rear limiting seat and a rear limiting rod. The rear limiting rod is fixed laterally on the rear limiting seat and is parallel to the front limiting rod in the front limiting assembly. One end of the rear limiting rod and one end of the front limiting rod expand outward to form a flared opening, which is the frame entry point.
5. The tooling dolly with locking mechanism of claim 4, wherein: The top of the vehicle frame is provided with a tooling table, and tooling fixtures are provided on the tooling table.
6. The tooling dolly with locking mechanism of claim 5, wherein: The tooling fixture includes a driving device, a transmission mechanism, a first clamping body, a second clamping body, a third clamping body, a first sliding mechanism, a second sliding mechanism, and a third sliding mechanism. The driving device drives the first sliding mechanism, the second sliding mechanism, and the third sliding mechanism to move synchronously through the transmission mechanism. The first sliding mechanism, the second sliding mechanism, and the third sliding mechanism respectively drive the first clamping body, the second clamping body, and the third clamping body to move, so as to lock and fix the workpiece at multiple points synchronously through the first clamping body, the second clamping body, and the third clamping body. The first sliding mechanism includes a longitudinal guide rail and a longitudinal slider. The first clamping body is located on the longitudinal slider and can slide along the longitudinal guide rail; the second sliding mechanism includes a left transverse guide rail and a left transverse slider; the third sliding mechanism includes a right transverse guide rail and a right transverse slider. The left transverse guide rail and the right transverse guide rail are located on the tooling table and are on the same straight line. The second clamping body and the third clamping body are respectively located on the left transverse slider and the right transverse slider. The left transverse slider and the right transverse slider are respectively located on the left transverse guide rail and the right transverse guide rail. The left transverse guide rail and the right transverse guide rail are located on both sides of the longitudinal guide rail and are perpendicular to the longitudinal guide rail.
7. The tooling trolley with locking mechanism according to claim 6, characterized in that: The first clamping body, the second clamping body, and the third clamping body have the same structure. The second clamping body includes a support base and a clamping member. The clamping member is horizontally fixed on the support base. The support base is located on the left horizontal slider of the second sliding mechanism.
8. The tooling dolly with locking mechanism of claim 7, wherein: The transmission mechanism includes a left transmission plate, a right transmission plate, a left transmission column, and a right transmission column. The left and right transmission plates are respectively provided with a left elongated hole and a right elongated hole. One end of the left and right transmission plates is fixed on the longitudinal slider. The left elongated hole on the left transmission plate and the right elongated hole on the right transmission plate are respectively inserted into the left and right transmission columns and can slide relative to the left and right transmission columns. The left and right transmission columns are respectively erected on the left and right transverse sliders. The left and right transmission plates form a figure-eight structure.
9. The tooling dolly with locking mechanism of claim 8, wherein: The driving device directly drives the longitudinal slider to slide along the longitudinal guide rail, and the longitudinal slider simultaneously drives the left and right transverse sliders to move through the left and right transmission plates respectively.
10. The tooling dolly with locking mechanism of claim 9, wherein: The clamping component includes a clamping block, a pressure sensor, a spring, a clamping rod, and a retaining ring. The clamping block has a mounting hole and a lead wire hole on its side wall. The pressure sensor is installed at the bottom of the mounting hole, and the data line on the pressure sensor passes through the lead wire hole and is electrically connected to the controller. The clamping rod is inserted into the mounting hole, and the spring is installed in the mounting hole and located between the clamping rod and the pressure sensor. The clamping rod has a limiting boss. The retaining ring is fixed to the mounting hole on the clamping block by screws. The clamping end of the clamping rod extends out of the clamping block through the retaining ring. The retaining ring is used to block the limiting boss on the clamping rod to prevent the clamping rod from disengaging from the mounting hole.