A push-type depth adjustment device for a drawer guide

Abstract

The application discloses a furniture guide rail pressing type depth adjusting device and relates to the technical field of furniture guide rails, which comprises a fixing sleeve, a connecting rod, an adjusting rotary rod, a top rod and a spring piece. In the process that the top rod is pressed once and released, the adjusting rotary rod is axially moved to make the sliding block separate from the current limiting guide groove by overcoming the elastic axial force of the spring piece, the adjusting rotary rod is rotated to make the sliding block align with the adjacent limiting guide groove through the one-way meshing of the first and second ratchet gears, and finally, the adjusting rotary rod is aligned and slid into the adjacent limiting guide groove under the reset force of the spring piece, so that the axial position of the stopper bump block is changed to realize the switching of the depth gears.

Description

Technical Field

[0001] This invention relates to the field of furniture guide rail technology, and in particular to a push-button depth adjustment device for drawer guide rails. Background Technology

[0002] In furniture drawer products, installation errors in the guide rails and dimensional errors in the front panel of the drawer often result in inconsistent gaps between the front panel and the cabinet when the drawer is closed, affecting its appearance. To address this, various depth adjustment devices have emerged in the prior art. For example, the applicant's prior patent CN116058611B discloses a movable depth-adjustable guide rail for furniture drawers. Its depth adjustment device includes a fixed base, a stop, and a locking component. By rotating the locking component, its eccentric locking hole presses or releases the adjusting rod, thereby locking and adjusting the axial position of the stop. While this solution achieves depth adjustment, it still has the following shortcomings: 1. Inconvenient operation: When adjusting, a special tool (such as a Phillips screwdriver) is required to be inserted into the operating port and engage with the transmission gear. The locking part must be rotated to the release position first, and then the transmission gear must be axially moved. After the adjustment is completed, the locking part must be rotated again to the tension position, which is a complicated process.

[0003] 2. Prone to accidental activation: The locking mechanism is exposed on the side of the moving rail, and users or children may accidentally rotate the locking mechanism, causing the depth setting to be changed unintentionally.

[0004] 3. Complex structure: The locking parts, stop parts and fixed base need to be precisely matched, which makes the assembly difficult. In addition, the long-term pressure between the eccentric locking hole and the adjusting rod can easily cause the plastic parts to wear or deform. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of existing depth adjustment devices, such as cumbersome operation, easy accidental activation, and complex structure, and provides a furniture guide rail depth adjustment device that adopts a press ratchet mechanism, can achieve rapid adjustment in stages, and is self-locking and stable.

[0006] To achieve the above objectives, the present invention provides a press-type depth adjustment device for furniture guide rails, comprising: The fixed sleeve has at least two circumferentially arranged limiting guide grooves with different axial depths on its inner wall; The connecting rod is coaxially and movably fitted into the inner cavity of the fixed sleeve. Its tail extends axially to the outside of the end of the fixed sleeve and forms a stop block. Its head is coaxially and movably fitted with the tail of the adjusting rod. The adjusting rod is coaxially and movably fitted into the inner cavity of the fixed sleeve. Its head is formed with a second ratchet set, and its circumferential surface is provided with at least one slider that slides in cooperation with the limiting guide groove. The push rod has its head extending axially to the outside of the end of the fixed sleeve, and its tail is arranged opposite to the head of the connecting rod. The tail of the push rod is formed with a first ratchet set that meshes unidirectionally with the second ratchet set. A spring element that applies an elastic axial force to the connecting rod in the direction of the adjusting knob; In the process of pressing and releasing the top rod, the adjusting rod first moves axially against the elastic axial force of the spring to make the slider disengage from the current limiting guide groove. Then, through the one-way meshing of the first ratchet group and the second ratchet group, the adjusting rod is driven to rotate so that the slider aligns with the adjacent limiting guide groove. Finally, under the action of the spring's restoring force, the slider slides into the adjacent limiting guide groove, thereby changing the axial position of the stop block to achieve the switching of the depth gear.

[0007] Furthermore, the spring is sleeved on the connecting rod, and both ends of the spring act on the connecting rod and the inner wall of the fixed sleeve, respectively.

[0008] Furthermore, the slots of adjacent limiting guide grooves are transitioned by an inclined surface, wherein the inclination direction of the inclined surface corresponds to the direction of rotation of the adjusting rod under pressure.

[0009] Furthermore, the inner wall of the fixed sleeve is formed with an axially extending first guide groove, and the circumferential surface of the connecting rod is formed with a first protrusion that is directionally and slidably engaged with the first guide groove.

[0010] Furthermore, the inner wall of the fixed sleeve is formed with an axially extending second guide groove, and the circumferential surface of the push rod is formed with a second protrusion that is directionally and slidably engaged with the second guide groove.

[0011] The present invention adopts the above-mentioned solution, and its beneficial effects are as follows: 1. Simple operation: The depth settings can be switched cyclically simply by pressing the top rod, without the need for special tools or the cumbersome steps of rotating to release and then adjusting, greatly improving the user experience. 2. Compact and reliable structure: It adopts a ratchet assembly in conjunction with the depth limit guide groove, and uses spring reset for automatic switching. The number of parts is small, the assembly is simple, and there are no long-term pressure wear points, resulting in a long service life. 3. Clear settings: Each press causes the stop block to move axially by a fixed step, and the gap between the drawer panel and the cabinet can be precisely quantified and adjusted. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a press-type depth adjustment device.

[0013] Figure 2-3 This is an exploded view of the press-type depth adjustment device.

[0014] Figure 4 This is a schematic diagram of the fixed sleeve structure.

[0015] Figure 5This is a schematic diagram of the sliding fit between the slider and the limiting guide groove.

[0016] Among them, 1-fixed sleeve, 11-first guide groove, 12-limiting guide groove, 13-second guide groove, 2-connecting rod, 21-stop block, 22-first protrusion, 3-adjusting knob, 31-second ratchet set, 32-slider, 4-top rod, 41-first ratchet set, 42-second protrusion, 5-spring component. Detailed Implementation

[0017] To facilitate understanding of the present invention, a more complete description is given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0018] See appendix Figure 1-5 As shown, in this embodiment, a press-type depth adjustment device for furniture guide rails is provided. This depth adjustment device is suitable for adjusting the movable depth of the drawer panel relative to the slide rail. For example, the depth adjustment device of this embodiment is applied in the patent "CN202310040564. A movable depth adjustment guide rail for furniture drawers". By installing the depth adjustment device on the movable rail of the drawer slide rail and cooperating with the drive device preset on the fixed rail of the drawer slide rail, the function of closing buffer self-closing and / or pressing and opening of the movable rail can be realized. Its structure and principle are conventional technical means, and can be referred to in existing patents CN116058611B, CN213282174U, CN115299720A and TWI767690B. The specific principle and structural features will not be elaborated here.

[0019] Specifically, the press-type depth adjustment device of this embodiment includes a fixed sleeve 1, a connecting rod 2, an adjusting knob 3, a push rod 4, and a spring 5. For ease of explanation, the fixed sleeve 1 is used as a reference, with its two ends corresponding to the head and tail respectively, and the other components are described accordingly.

[0020] In this embodiment, the fixing sleeve 1 is a hollow cylinder with five circumferentially evenly distributed limiting guide grooves 12 on its inner wall. Each limiting guide groove 12 is an axially extending groove, and the openings of each limiting guide groove 12 are interconnected—that is, all limiting guide grooves 12 are interconnected at their starting ends near the tail of the adjusting rod 3, forming an annular common area, so that the slider 32 of the adjusting rod 3 can move from the current guide groove into the entrance of the adjacent guide groove after completing its rotation. Furthermore, adjacent limiting guide grooves 12 are transitioned by an inclined surface, the inclination direction of which matches the rotation direction of the adjusting rod 3 when driven by the ratchet, so that the slider 32 slides into the next adjacent groove along the inclined surface during reset. Figure 5 For illustration, the axial depths of the five limiting guide grooves 12 increase in a stepwise manner in a clockwise direction, and are defined as the first depth d1, the second depth d2, the third depth d3, the fourth depth d4, and the fifth depth d5, respectively, with d1 < d2 < d3 < d4 < d5. Among them, the fifth limiting guide groove 12 with the largest depth is adjacent to the first limiting guide groove 12 with the smallest depth, and the two are also connected by a slope, thereby realizing cyclic shifting.

[0021] In this embodiment, the connecting rod 2 is coaxially and movably fitted into the inner cavity of the fixed sleeve 1. The tail of the connecting rod 2 extends to the outside of the tail end of the fixed sleeve 1 and is fixed or integrally formed with a stop block 21 (this stop block 21 is used to cooperate with the driving device of the prior art, and its principle can be referred to the "stop block and driving device ejection cooperation" in the prior patent "CN202310040564. A movable depth adjustment guide rail for furniture drawers", which will not be elaborated here). A first protrusion 22 is formed on the circumferential surface of the connecting rod 2. Correspondingly, the inner wall of the fixed sleeve 1 is also provided with an axially extending first guide groove 11. By slidingly engaging the first protrusion 22 with the first guide groove 11 on the inner wall of the fixed sleeve 1, the rotation of the connecting rod 2 relative to the fixed sleeve 1 is restricted, and only axial movement is allowed. In addition, the head of the connecting rod 2 in this embodiment is provided with a cylindrical insertion hole for movably engaging with the tail of the adjusting rod 3.

[0022] In this embodiment, the adjusting rod 3 is coaxially and movably fitted into the inner cavity of the fixed sleeve 1. The tail of the adjusting rod 3 is cylindrical and is inserted into the insertion hole at the head of the connecting rod 2, allowing the two to rotate relative to each other and move axially relative to each other. The head of the adjusting rod 3 is formed with a second ratchet set 31, which consists of multiple circumferentially distributed inclined teeth. At least one slider 32 is provided on the circumferential surface of the adjusting rod 3 (the number of sliders 32 can be set as needed, equal to or less than the number of limiting guide grooves 12), and the slider 32 slides in engagement with the five limiting guide grooves 12 on the inner wall of the fixed sleeve 1 one by one.

[0023] In this embodiment, the push rod 4 is coaxially and movably fitted into the inner cavity of the fixed sleeve 1, with its head extending beyond the end of the fixed sleeve 1 and its tail positioned opposite to the head of the adjusting rod 3. The tail of the push rod 4 is formed with a first ratchet set 41, which also consists of multiple circumferentially distributed inclined teeth. These teeth match the tooth shape of the second ratchet set 31 but are in opposite directions, forming a contact engagement. That is, when the push rod 4 is pressed, the contact engagement between the inclined teeth pushes the adjusting rod 3 to move axially and rotate one tooth position; when the push rod 4 retracts in the opposite direction, the inclined teeth disengage, and the adjusting rod 3 is no longer driven to move or rotate. A second protrusion 42 is formed on the circumferential surface of the push rod 4. Correspondingly, the inner wall of the fixed sleeve 1 is also provided with an axially extending second guide groove 13. The second protrusion 42 slides into the second guide groove 13 on the inner wall of the fixed sleeve 1, thereby restricting the rotation of the push rod 4 relative to the fixed sleeve 1 and allowing only axial movement.

[0024] In this embodiment, the spring element 5 is a compression helical spring, which is sleeved on the connecting rod 2. One end of the spring element 5 abuts against the stepped surface of the connecting rod 2, and the other end abuts against the inner end face of the fixing sleeve 1, and always applies an elastic axial force to the connecting rod 2 in the direction of the adjusting knob 3.

[0025] To facilitate understanding, the following explanations are provided in conjunction with the specific working principles. For the sake of clarity in the drawings, please refer to the attached diagrams. Figure 5 The inner wall of the fixed sleeve 1 is laid flat at the limiting guide groove 12 to clearly show the switching trajectory of the slider 32 between each limiting guide groove 12.

[0026] Initial state (first gear, stop block 21 at maximum extension): slider 32 is located in the limiting guide groove 12 at the first depth d1, adjusting rod 3 and connecting rod 2 are at the lowest axial position, and spring 5 is in a compressed state. Stop block 21 extends to its maximum extent relative to the tail end of fixed sleeve 1.

[0027] Pressing process: The user presses the head of the push rod 4, the push rod 4 moves backward, the first ratchet set 41 and the second ratchet set 31 engage, pushing the adjusting rod 3 to move axially backward against the elastic force of the spring 5. At this time, the slider 32 first slides only axially backward along the current limiting guide groove 12 (during this stage, the adjusting rod 3 is constrained by the guide groove wall and does not rotate), until the slider 32 slides out of the guide groove opening and enters the annular common area of ​​the inner wall of the fixed sleeve 1; then, due to the action of the inclined teeth, the adjusting rod 3 rotates clockwise relative to the push rod 4 and the connecting rod 2, completing the reversal alignment.

[0028] Release process: The user releases the top rod 4, and the elastic axial force of the spring 5 pushes the connecting rod 2 and the adjusting rod 3 forward. While moving forward, the already rotated and aligned slider 32 slides into the adjacent second depth d2 limiting guide groove 12 (here, the inclined plane 113 can further guide it so that the slider 32 can slide into the limiting guide groove 12 more accurately and smoothly). Since d2>d1, the final position of the adjusting rod 3 and the connecting rod 2 is further forward than the initial position, thereby causing the stop block 21 to retract inward.

[0029] Press and release the push rod 4 again, and the slider 32 will slide from the limiting guide groove 12 at the second depth d2 into the limiting guide groove 12 at the third depth d3, and the stop block 21 will retract further inward. In this way, with each press, the slider 32 will enter the limiting guide groove 12 with a greater depth in sequence (d1→d2→d3→d4→d5), and the axial extension of the stop block 21 will change in a step-like manner, thereby realizing five-level cyclic adjustment.

[0030] In addition, since each limiting guide groove 12 adopts an axial ring arrangement, it realizes unidirectional circulation adjustment. That is, after completing the above four pressing operations, the next pressing and releasing of the top rod 4 will return to the initial state from d5→d1.

[0031] In this embodiment, five limiting guide grooves 12 with increasing depth are used to achieve five depth levels. The axial displacement difference between adjacent levels is determined by the depth difference, which can be set according to the actual adjustment range of the guide rail during design. If more levels are needed (such as three, four, or six levels), the number of limiting guide grooves 12 and the number of ratchet teeth can be adjusted accordingly to make them equal, ensuring that each press rotates one groove.

[0032] In summary, compared to the locking element-eccentric hole structure in CN116058611B, this invention eliminates the need for rotating the locking element, special tools, and visual alignment of the operating port. Multiple continuous adjustments can be achieved simply by pressing, and there is no risk of losing a position due to vibration or accidental touch during adjustment. Furthermore, the ratchet mechanism of this invention rotates during pressing and is guided by an inclined plane to complete the repositioning upon release. The entire movement is entirely constrained by mechanical geometry, resulting in higher reliability and suitability for furniture applications requiring frequent adjustments.

[0033] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any modifications or variations made by those skilled in the art, without departing from the scope of the present invention, using the disclosed technical content, are equivalent embodiments of the present invention. Therefore, all equivalent changes made based on the concept of the present invention without departing from the scope of the present invention should be covered within the protection scope of the present invention.

Claims

1. A press-type depth adjustment device for furniture guide rails, characterized in that: include: The fixed sleeve (1) has at least two limiting guide grooves (12) arranged circumferentially and with different axial depths on its inner wall. The connecting rod (2) is coaxially and movably fitted into the inner cavity of the fixed sleeve (1). Its tail extends axially to the outside of the end of the fixed sleeve (1) and forms a stop block (21). Its head is coaxially and movably fitted with the tail of the adjusting rod (3). The adjusting rod (3) is coaxially and movably embedded in the inner cavity of the fixed sleeve (1). Its head is formed with a second ratchet group (31), and its circumferential surface is provided with at least one slider (32) that slides and engages with the limiting guide groove (12). The top rod (4) extends axially to the end of the fixed sleeve (1), and its tail is arranged opposite to the head of the connecting rod (2). The tail of the top rod (4) is formed with a first ratchet group (41) that meshes unidirectionally with the second ratchet group (31). Spring (5) applies an elastic axial force to the connecting rod (2) in the direction of the adjusting rod (3); During the process of the top rod (4) being pressed and released, the adjusting rod (3) first overcomes the elastic axial force of the spring (5) and moves axially to make the slider (32) disengage from the current limiting guide groove (12). Then, through the one-way meshing of the first ratchet group (41) and the second ratchet group (31), the adjusting rod (3) is driven to rotate so that the slider (32) is aligned with the adjacent limiting guide groove (12). Finally, under the action of the restoring force of the spring (5), it slides into the adjacent limiting guide groove (12), thereby changing the axial position of the stop block (21) to realize the switching of the depth gear.

2. The press-type depth adjustment device for a furniture guide rail according to claim 1, characterized in that: The spring element (5) is sleeved on the connecting rod (2), and the two ends of the spring element (5) act on the inner wall of the connecting rod (2) and the fixing sleeve (1) respectively.

3. The press-type depth adjustment device for a furniture guide rail according to claim 1, characterized in that: The slots of adjacent limiting guide grooves (12) are connected by an inclined surface, wherein the inclination direction of the inclined surface corresponds to the pressure rotation direction of the adjusting rod (3).

4. The press-type depth adjustment device for a furniture guide rail according to claim 1, characterized in that: The inner wall of the fixed sleeve (1) is formed with an axially extending first guide groove (11), and the circumferential surface of the connecting rod (2) is formed with a first protrusion (22) that is directionally and slidably fitted with the first guide groove (11).

5. The press-type depth adjustment device for a furniture guide rail according to claim 1, characterized in that: The inner wall of the fixed sleeve (1) is formed with an axially extending second guide groove (13), and the circumferential surface of the push rod (4) is formed with a second protrusion (42) that is directionally and slidably engaged with the second guide groove (13).

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