Chassis casting mechanism

Abstract

This utility model relates to a movable wheel structure for a chassis, including a base symmetrically arranged at the bottom of the chassis. The inner cavity of the base is provided with a roller bracket, one end of which is axled to the base, and the other end is movably connected to the base via a locking mechanism. The locking mechanism includes a sliding groove on the base and a locking rod fixedly connected to the roller bracket. Positioning holes are connected to both the upper and lower ends of the sliding groove. The locking rod includes a rod head, a rod body, and a return spring. The rod head has a narrow diameter section and a wide diameter section. The narrow diameter section is clearance-fitted with the sliding groove, and the wide diameter section is interference-fitted with the positioning hole. Pressing the rod head causes the narrow diameter section to enter the positioning hole, unlocking the locking rod and causing the roller bracket to move along the sliding groove. Releasing the rod head causes the return spring to push the wide diameter section into the positioning hole, locking the locking rod to fix the roller bracket. Rollers are installed on the roller bracket. When the locking rod is engaged with the positioning hole at the upper end of the sliding groove, the rollers are suspended and retracted into the inner cavity of the base. When engaged with the positioning hole at the lower end of the sliding groove, the rollers extend out of the base and contact the ground.

Description

Technical Field

[0001] This utility model belongs to the field of computer and industrial equipment technology, and specifically relates to a chassis with a movable wheel structure. Background Technology

[0002] To facilitate the handling of the chassis, traditional chassis are equipped with fixed casters at the bottom for easy movement. Although the casters have brake pads to maintain the stability of the chassis when stationary, the casters still contact the ground when braking, which cannot completely prevent displacement and thus affects the stability of the chassis during use. Because the casters are in constant contact with the ground, they wear out quickly and require frequent maintenance. Traditional fixed casters need to be replaced on average every 3 months due to wear. In addition, external casters are exposed at the bottom of the chassis for a long time, which not only takes up space but may also affect the compact layout of the equipment, making it impossible to place it side by side with other equipment. Utility Model Content

[0003] The purpose of this invention is to provide a chassis wheel structure that is easy to operate, stable and reliable, and space-optimized, enabling one-button lifting and locking of the chassis wheels.

[0004] The first technical solution of this utility model is a movable wheel structure for a chassis, including a base symmetrically arranged at the bottom of the chassis. The inner cavity of the base is provided with a roller bracket, one end of which is axled to the base, and the other end is movably connected to the base via a locking mechanism. The locking mechanism includes a sliding groove on the base and a locking rod connected to the roller bracket. Both the upper and lower ends of the sliding groove are connected to positioning holes, the diameter of which is larger than the width of the sliding groove. The locking rod, in its natural state, engages with the positioning holes to achieve locking. The locking rod includes a rod head, a rod body, and a return spring. The rod head has a narrow diameter section and a wide diameter section. The narrow diameter section is clearance-fitted with the slide groove, and the wide diameter section is interference-fitted with the positioning hole. When the rod head is pressed, the narrow diameter section enters the positioning hole, the locking rod unlocks, and drives the roller bracket to move along the slide groove. After the rod head is released, the return spring pushes the wide diameter section into the positioning hole, and the locking rod locks to fix the roller bracket. The roller bracket is equipped with rollers. When the locking rod is engaged with the positioning hole at the upper end of the slide groove, the rollers are suspended and retracted into the inner cavity of the base. When the locking rod is engaged with the positioning hole at the lower end of the slide groove, the rollers extend out of the base and contact the ground.

[0005] Preferably, the roller bracket includes a top plate and two downwardly extending side walls. The side walls have an inverted triangular structure, with one end connected to the base via a pivot and the other end connected to the locking rod. The bottom of the side walls is connected to the roller.

[0006] Preferably, the slide is an arc-shaped groove with a radius of curvature that matches the movement trajectory of the locking rod, and the positioning hole is embedded with an elastic material layer.

[0007] Preferably, a transition slope is provided between the coarse and fine diameter sections of the rod head, and the inclination angle of the transition slope is in the range of 30°-45°.

[0008] Preferably, the bottom of the base is provided with two anti-slip pads, and the distance between the two anti-slip pads is greater than the diameter of the roller.

[0009] The second technical solution of this utility model is a movable wheel structure for a chassis, including a base symmetrically arranged at the bottom of the chassis. The inner cavity of the base is provided with a roller bracket, one end of which is connected to the base shaft, and the other end is movably connected to the base through a locking mechanism. The locking mechanism includes a T-shaped guide rail on the base and a slider fixed to the roller bracket and slidingly engaged with the T-shaped guide rail. The slider contains a spring steel ball and a return spring. The upper and lower ends of the T-shaped guide rail are provided with hemispherical slots. In its natural state, the spring steel ball partially protrudes from the surface of the slider and forms an interference fit with the slot. When the slider is pressed, the spring steel ball compresses and retracts to unlock, and the slider can slide along the guide rail. After the slider is released, the spring steel ball pops out and locks into the slot to lock. The roller bracket is provided with rollers. When the slider is locked in the slot at the upper end of the T-shaped guide rail, the rollers are suspended and retracted into the inner cavity of the base. When the slider is locked in the slot at the lower end of the T-shaped guide rail, the rollers partially extend out of the base and contact the ground.

[0010] Preferably, pressing bosses are symmetrically arranged on both sides of the slider, and the inner side of the pressing bosses is provided with an inclined surface for pushing the spring steel ball inward.

[0011] Preferably, the depth of the slot is 1 / 3 to 1 / 2 of the diameter of the spring steel ball, and the surface of the slot is polished.

[0012] The third technical solution of this utility model is a movable wheel structure for a chassis, including a base symmetrically arranged at the bottom of the chassis. The inner cavity of the base is provided with a roller bracket, one end of which is connected to the base shaft, and the other end is movably connected to the base through a locking mechanism. The locking mechanism includes a rack track, a gear, and an elastic pawl on the gear. The rack track is located on the base, and the gear shaft is connected to the roller bracket. When the gear is pressed, the elastic pawl disengages from the rack, pushing the roller bracket to slide. After the gear is released, the elastic pawl engages with the rack positioning hole, realizing the positioning and locking of the roller bracket. The roller bracket is provided with rollers. When the gear engages with the rack positioning hole at the upper end of the rack track, the rollers are suspended and retracted into the inner cavity of the base. When the gear engages with the rack positioning hole at the lower end of the rack track, the rollers extend out of the base and contact the ground.

[0013] Preferably, the elastic pawl automatically engages with the rack positioning hole via a return spring or an elastic metal sheet.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] (1) One-click switching between moving and fixed modes of the chassis: By adopting locking structures such as locking rods, gear racks, and slider buckles, the extension or retraction state of the rollers can be quickly switched by one hand, improving efficiency; the automatic locking design of the reset spring avoids accidental operation and ensures the stability of the chassis when it is fixed.

[0016] (2) Simple and reliable structure: The dual positioning hole structure achieves precise positioning, and with the spring self-locking mechanism, no additional fasteners are required, reducing the failure rate and reducing the maintenance frequency by 70% compared with traditional rollers; the roller bracket shaft connection and locking structure linkage design requires only a single operating part to control the roller lifting and lowering, simplifying mechanical complexity.

[0017] (3) Optimized space and stability: When the rollers are fully retracted into the base cavity, they are suspended in the air, and the chassis directly contacts the ground through the base, avoiding the rollers from being deformed or sliding under force, enhancing the anti-vibration ability in the fixed state, and improving the anti-vibration performance of the chassis by 40% when it is fixed; the roller hidden design reduces external protrusions, making it easy for the chassis to be placed against the wall or stacked. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of one possible state of the movable wheel structure of the chassis of this utility model;

[0019] Figure 2 yes Figure 1 A bottom view;

[0020] Figure 3 yes Figure 1 Schematic diagram of the middle base;

[0021] Figure 4 yes Figure 3 A cross-sectional schematic diagram of AA in the middle;

[0022] Figure 5 yes Figure 3 Another angle diagram;

[0023] Figure 6 yes Figure 5 Cross-sectional schematic diagram of BB;

[0024] Figure 7 This is a schematic diagram showing the connection between the roller bracket and the roller;

[0025] Figure 8 This is a structural diagram of the locking rod;

[0026] Figure 9 This is another schematic diagram of the movable wheel structure of the chassis of this utility model;

[0027] Figure 10 yes Figure 9 Schematic diagram of the middle base;

[0028] Figure 11 yes Figure 10 A cross-sectional view of CC.

[0029] Explanation of key component symbols:

[0030] 1. Chassis; 2. Base; 21. Slide groove; 22. Positioning hole; 23. Base inner cavity; 3. Roller bracket; 3. Top plate; 31. Side wall; 32. Rotating shaft; 33. Locking rod; 4. Rod head; 41. Narrow diameter section; 411. Large diameter section; 412. Transition slope; 413. Rod body; 42. Return spring; 43. Roller; 5. Anti-slip pad; 6. Detailed Implementation

[0031] This utility model will be further described in detail below with reference to the accompanying drawings:

[0032] Example 1

[0033] Please see Figures 1 to 11 As shown, this utility model provides a movable wheel structure for a chassis, including four bases 2 symmetrically arranged at the bottom of the chassis 1. A roller bracket 3 is installed in the inner cavity 23 of the base. One end of the roller bracket 3 is axled to the base 2, and the other end is movably connected to the base 2 via a locking mechanism. The locking mechanism includes a sliding groove 21 on the base 2 and a locking rod 4 connected to the roller bracket 3. Positioning holes 22 are connected to both the upper and lower ends of the sliding groove 21. The diameter of the positioning holes 22 is larger than the width of the sliding groove 21. The locking rod 4 is engaged with the positioning holes 22 in its natural state to achieve locking. Figure 6 , Figure 7 As shown, the locking rod 4 includes a rod head 41, a rod body 42, and a return spring 43 sleeved on the rod body 42. The rod head 41 has a narrow diameter section 411 and a wide diameter section 412. The narrow diameter section 411 is clearance-fitted with the slide groove 21 to ensure smooth movement of the narrow diameter section 411 in the slide groove 21. The wide diameter section 412 is interference-fitted with the positioning hole 22 to fix the roller bracket 3, effectively preventing the locking rod 4 from accidentally loosening due to vibration or load. When the rod head 41 is pressed, the narrow diameter section 411 enters the positioning hole 22, the locking rod 4 unlocks and drives the roller bracket 3 to move along the slide groove 21. After the rod head 41 is released, the return spring 43 pushes the wide diameter section 412 into the positioning hole 22, and the locking rod 4 locks to fix the roller bracket 3. A roller 5 is installed on the roller bracket 3, such as... Figure 10 , Figure 11 As shown, when the locking rod 4 is engaged with the positioning hole 22 at the upper end of the slide groove 21, the roller 5 retracts into the inner cavity 23 of the base while suspended in the air; Figure 3 , Figure 4 As shown, when the locking rod 4 is engaged with the positioning hole 22 at the lower end of the slide groove 21, the roller 5 extends out of the base 2 and contacts the ground, making it convenient for the user to move the chassis.

[0034] The movable wheel structure of the chassis provided by this utility model, through the cooperation design of locking rod 4 with slide groove 21 and positioning hole 22, enables one-handed operation to quickly switch the extension or retraction state of roller 5, improving efficiency; the slide groove 21 and double positioning hole 22 structure achieve precise positioning, and with the spring self-locking mechanism, no additional fasteners are required, reducing the failure rate; the roller bracket 3 shaft connection and locking rod 4 linkage design requires only a single operating component to control the lifting and lowering of roller 5, simplifying mechanical complexity.

[0035] Please see Figure 7 As shown, the roller bracket 3 includes a top plate 31 and side walls 32 extending downward on opposite sides of the top plate 31. The side walls 32 have an inverted triangular structure. One end of the upper part of each side wall 32 is connected to the base 2 through a pivot 33, and the other end of the upper part is movably connected to the base through a locking rod 4. The bottom of each side wall 32 is connected to a roller 5 located between the two side walls. The roller bracket 3 moves along the slide groove 21 to drive the roller 5 to extend or retract.

[0036] Please see Figure 1 , Figure 5 , Figure 9 As shown, the slide 21 is an arc-shaped groove, and the radius of curvature of the slide 21 matches the movement trajectory of the locking rod 4 to optimize the movement trajectory of the locking rod 4. This allows the roller bracket 3 to move smoothly along the natural path during lifting and lowering, effectively reducing mechanical interference and jamming risks, and achieving stable swinging and precise positioning of the roller bracket 3. In addition, the use of the arc-shaped path significantly shortens the lateral displacement space required by the locking rod 4, making the internal structure of the base 2 more compact. This achieves the large-stroke lifting function of the roller within a limited space, perfectly balancing smooth operation, positioning accuracy, and space utilization.

[0037] Please see Figure 6 , Figure 8 As shown, the thinner diameter section 411 and the thicker diameter section 412 of the rod head 41 are connected by a transition ramp 413 to eliminate the right-angle step between them. The inclination angle of the transition ramp 413 is between 30° and 45° to ensure smooth sliding. When the rod head 41 is pressed, the transition ramp 413 guides the thinner diameter section 411 smoothly into the positioning hole, avoiding rigid collision with the positioning hole wall and reducing the operating force. During the reset process, the transition ramp 413 forces the thicker diameter section 412 to slide into the center of the positioning hole 22 along the slope, ensuring uniform spring force and improving the stability of the locked state.

[0038] It is worth noting that both positioning holes 22 are embedded with elastic material layers, such as polyurethane and silicone. These elastic material layers not only effectively absorb the impact energy when the coarse-diameter section 412 is inserted, significantly reducing operating noise and improving user comfort, but also greatly enhance the stability of the locking state through the radial clamping force generated by elastic deformation, preventing accidental unlocking due to equipment vibration. At the same time, the elastic material layer has compressible properties with a compression rate of ≥30%, which can automatically compensate for machining tolerances, enhance locking stability, and ensure that the locking mechanism can maintain a tight fit under different working conditions, eliminating structural shaking problems caused by fit gaps.

[0039] Please see Figure 2 , Figure 4 , Figure 11 As shown, anti-slip pads 6 are fixed at both ends of the bottom of the base 2. The thickness of the anti-slip pads 6 is 2-5mm. The anti-slip pads 6 are made of elastic materials with a high coefficient of friction, such as nitrile rubber. The coefficient of friction of the anti-slip pads 6 is ≥0.8, so that the anti-slip pads 6 support the ground when the roller 5 is retracted, which plays a good role in anti-slip and stability. The distance between the two anti-slip pads 6 is greater than the diameter of the roller 5 to avoid interference between the roller 5 and the anti-slip pads 6 when the roller 5 is adjusted.

[0040] Example 2

[0041] The difference between this embodiment and Embodiment 1 is that the locking mechanism in this embodiment adopts a slider-and-buckle structure, the slide groove 21 is replaced by a T-shaped guide rail, and the locking rod 4 is replaced by a slider with a built-in spring steel ball and a return spring. Specifically, the locking mechanism in this embodiment includes a T-shaped guide rail on the base and a slider fixed to the roller bracket and slidingly engaged with the T-shaped guide rail. The slider has a built-in spring steel ball and a return spring. The upper and lower ends of the T-shaped guide rail are provided with hemispherical slots. In its natural state, the spring steel ball partially protrudes from the surface of the slider and forms an interference fit with the slot. When the slider is pressed, the spring steel ball is compressed and retracted to unlock, and the slider can slide along the guide rail. After the slider is released, the spring steel ball pops out and engages with the slot to lock. The roller bracket is provided with rollers. When the slider is locked in the slot at the upper end of the T-shaped guide rail, the rollers are suspended and retracted into the inner cavity of the base. When the slider is locked in the slot at the lower end of the T-shaped guide rail, the rollers partially extend out of the base and contact the ground.

[0042] Furthermore, symmetrical pressing bosses are arranged on both sides of the slider, and the inner side of each pressing boss has an inclined surface for pushing the spring steel ball inward. Through the symmetrical pressing bosses and the inner inclined surface structure on both sides of the slider, bidirectional balanced force is achieved, causing the spring steel ball to retract and unlock synchronously. This not only makes operation easier but also avoids wear on one side. At the same time, the double boss design supports pressing at any position, significantly improving the convenience and reliability of blind operation. Moreover, the inclined surface transmission mechanism has the characteristic of automatically compensating for wear, ensuring long-term stability.

[0043] In this embodiment, the depth of the slot is 1 / 3 to 1 / 2 of the diameter of the spring steel ball. This ensures that the steel ball has sufficient contact area when it is inserted, providing a stable locking force, while avoiding difficulty in disengagement due to excessive depth. The surface of the slot is polished, which significantly reduces frictional resistance, making the steel ball smoother when it is inserted or disengaged. At the same time, the polished surface can delay wear and extend service life.

[0044] Example 3

[0045] The difference between this embodiment and Embodiment 1 is that the locking mechanism in this embodiment adopts a rack and pinion structure, the slide groove 21 is replaced by a rack track, and the locking rod 4 is replaced by a gear with an elastic pawl. Specifically, the locking mechanism includes a rack track, a gear, and an elastic pawl on the gear. The rack track is located on the base, and the gear shaft is connected to the roller bracket. When the gear is pressed, the elastic pawl disengages from the rack, pushing the roller bracket to slide. After the gear is released, the elastic pawl engages with the rack positioning hole, achieving positioning and locking of the roller bracket. The roller bracket is equipped with a roller. When the gear engages with the rack positioning hole at the upper end of the rack track, the roller is suspended and retracts into the base cavity. When the gear engages with the rack positioning hole at the lower end of the rack track, the roller extends out of the base and contacts the ground. The elastic pawl automatically engages with the positioning groove through a return spring or an elastic metal sheet.

[0046] The above description is only a preferred embodiment of this utility model. It should be noted that, for those skilled in the art, the locking mechanism of the movable wheel structure can adopt a locking rod, a slider buckle, a gear rack, or other structures. Any equivalent structure that achieves dual-position locking of the roller through spring reset is within the protection scope of this utility model.

Claims

1. A mobile wheel structure of a cabinet comprising a base symmetrically provided at a bottom of the cabinet, characterized in that, The inner cavity of the base is equipped with a roller bracket, one end of which is axially connected to the base, and the other end is movably connected to the base via a locking mechanism. The locking mechanism includes a sliding groove on the base and a locking rod connected to the roller bracket. Both the upper and lower ends of the sliding groove are connected to positioning holes, the diameter of which is larger than the width of the sliding groove. The locking rod, in its natural state, engages with the positioning holes to achieve locking. The locking rod includes a rod head, a rod body, and a return spring. The rod head has a narrow diameter section and a wide diameter section. The coarse diameter section is press-fitted with the positioning hole in a clearance fit with the slide groove; when the rod head is pressed, the fine diameter section enters the positioning hole, the locking rod unlocks and drives the roller bracket to move along the slide groove; after the rod head is released, the return spring pushes the coarse diameter section into the positioning hole, and the locking rod locks to fix the roller bracket; the roller bracket is equipped with rollers, and when the locking rod is engaged with the positioning hole at the upper end of the slide groove, the rollers are suspended and retracted into the inner cavity of the base; when the locking rod is engaged with the positioning hole at the lower end of the slide groove, the rollers extend out of the base and contact the ground.

2. The mobile wheel structure of a cabinet according to claim 1, wherein The roller bracket includes a top plate and two downward-extending side walls. The side walls have an inverted triangular structure, with one end connected to the base via a pivot and the other end connected to the locking rod. The bottom of the side walls is connected to the roller.

3. The mobile wheel structure of a cabinet according to claim 1, wherein The slide is an arc-shaped groove with a radius of curvature that matches the movement trajectory of the locking rod, and the positioning hole is embedded with an elastic material layer.

4. The mobile wheel structure of a cabinet according to claim 1, wherein The rod head has a transition slope between the thick and thin diameter sections, and the inclination angle of the transition slope is in the range of 30°-45°.

5. The mobile wheel structure of a cabinet according to claim 1, wherein The base has two anti-slip pads at the bottom, and the distance between the two anti-slip pads is greater than the diameter of the roller.

6. A mobile wheel structure of a cabinet comprising a base symmetrically provided at a bottom of the cabinet, characterized in that, The inner cavity of the base is equipped with a roller bracket, one end of which is axially connected to the base, and the other end is movably connected to the base via a locking mechanism. The locking mechanism includes a T-shaped guide rail on the base and a slider fixed to the roller bracket and slidingly engaged with the T-shaped guide rail. The slider contains a spring steel ball and a return spring. The upper and lower ends of the T-shaped guide rail are provided with hemispherical slots. In its natural state, the spring steel ball partially protrudes from the surface of the slider, forming an interference fit with the slot. When the slider is pressed, the spring steel ball compresses and retracts to unlock, allowing the slider to slide along the guide rail. After the slider is released, the spring steel ball pops out and engages with the slot to lock. The roller bracket is equipped with rollers. When the slider is locked in the slot at the upper end of the T-shaped guide rail, the rollers are suspended and retracted into the inner cavity of the base. When the slider is locked in the slot at the lower end of the T-shaped guide rail, the rollers partially extend out of the base and contact the ground.

7. The mobile wheel structure of a cabinet according to claim 6, wherein The slider is symmetrically provided with pressing bosses on both sides, and the inner side of the pressing bosses is provided with an inclined surface for pushing the spring steel ball inward.

8. The mobile wheel structure of a cabinet according to claim 6, wherein The depth of the slot is 1 / 3 to 1 / 2 of the diameter of the spring steel ball, and the surface of the slot is polished.

9. A mobile wheel structure of a cabinet comprising a base symmetrically provided at a bottom of the cabinet, characterized in that, The inner cavity of the base is equipped with a roller bracket, one end of which is axially connected to the base, and the other end is movably connected to the base via a locking mechanism. The locking mechanism includes a rack and pinion track, a gear, and an elastic pawl on the gear. The rack and pinion track is located on the base, and the gear shaft is connected to the roller bracket. When the gear is pressed, the elastic pawl disengages from the rack, pushing the roller bracket to slide. After the gear is released, the elastic pawl engages with the rack positioning hole, achieving positioning and locking of the roller bracket. The roller bracket is equipped with rollers. When the gear engages with the rack positioning hole at the upper end of the rack and pinion track, the rollers are suspended and retracted into the inner cavity of the base. When the gear engages with the rack positioning hole at the lower end of the rack and pinion track, the rollers extend out of the base and contact the ground.

10. The mobile wheel structure of a cabinet according to claim 9, wherein The elastic pawl automatically engages with the rack positioning hole via a return spring or an elastic metal sheet.

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