Anti-toppling office cabinet

Abstract

This application provides an anti-tipping office cabinet, relating to the field of office cabinet technology. It includes: a cabinet body with a front-opening accommodating cavity; a drawer slidably disposed within the accommodating cavity; a displacement detection mechanism for detecting the displacement of the drawer; a weight detection mechanism for detecting the weight of the contents of the drawer; a counterweight groove, including a first groove located on the bottom side of the cabinet body and a second groove located on the rear side of the cabinet body; a plurality of counterweight sub-units located within the counterweight groove; an adjustment mechanism for adjusting the position of the counterweight sub-units within the counterweight groove; and a controller that, when the displacement of the drawer reaches a set threshold, calculates a first number of counterweight sub-units requiring adjustment based on the weight of the contents of the drawer, and triggers the adjustment mechanism to adjust the first number of counterweight sub-units to a counterweight state. This application shifts the overall center of gravity backward when the drawer is pulled out, thereby maintaining the overall stability of the office cabinet.

Description

Technical Field

[0001] This application relates to the field of office cabinet technology, and more particularly to an anti-tipping office cabinet. Background Technology

[0002] In daily life, offices, and industrial equipment, vertical storage cabinets with drawers are widely used (filing cabinets, tool cabinets, equipment control cabinets, heavy-duty material cabinets, household tall cabinets, etc.). These cabinets are mostly made of thin-walled sheet metal or panel splicing structures, relying on the bottom support surface contacting the ground for static stability. The drawers move in a one-dimensional translational motion along horizontal guide rails. When in use, pulling the drawers outwards alters the overall stress distribution of the cabinet, easily causing it to tilt forward, tip over, or fall over, posing a long-standing and common technical defect in the field of cabinet structural stability.

[0003] Existing technologies generally address the problem of cabinet tipping using the following solutions: a) Widening the cabinet base and increasing the width of the bottom support. Disadvantages: Occupies more indoor space, significantly increases the overall size of the cabinet, reduces storage space utilization, and standardized cabinets are difficult to adapt to small workstations. b) Fixing the cabinet to the wall using expansion screws at the back. Disadvantages: Cannot be securely fixed to lightweight partitions or plaster walls; unsuitable for scenarios requiring frequent cabinet movement (mobile tool cabinets, temporary workbenches); cumbersome disassembly and assembly, damaging the wall surface.

[0004] Therefore, developing an anti-tipping office cabinet that does not damage the wall or significantly increase the cabinet's volume is one of the urgent problems to be solved. Summary of the Invention

[0005] This application provides an anti-tipping office cabinet to at least solve the above-mentioned technical problems existing in the prior art.

[0006] According to a first aspect of this application, an anti-tipping office cabinet is provided, comprising: The cabinet has a receiving cavity with a front opening. The drawer is slidably disposed within the accommodating cavity; A displacement detection mechanism is used to detect the displacement of the drawer; A weight detection mechanism is used to detect the weight of the contents loaded in the drawer; The counterweight groove includes a first groove located on the bottom side of the cabinet and a second groove located on the rear side of the cabinet, and the first groove and the second groove are connected. Several counterweight sub-units, wherein the counterweight sub-units are located within the counterweight groove; An adjustment mechanism is used to adjust the position of the counterweight subunit in the counterweight groove; in the initial state, the counterweight subunit is located in the first groove; in the counterweight state, the counterweight subunit is located in the second groove. When the displacement of the drawer reaches a set threshold, the controller calculates the first number of counterweight subunits that need to be adjusted based on the weight of the contents of the drawer, and triggers the adjustment mechanism to adjust the first number of counterweight subunits to the counterweight state.

[0007] In some embodiments of the first aspect of this application, the displacement detection mechanism includes a distance sensor mounted at the end of the drawer to detect the distance between the end of the drawer and the rear side of the receiving cavity as the displacement of the drawer.

[0008] In some embodiments of the first aspect of this application, the weight detection mechanism includes a detection plate located above the bottom plate of the drawer, and a plurality of weighing sensors are disposed between the bottom plate and the detection plate, wherein the sum of the weights detected by the plurality of weighing sensors is used as the weight of the contents loaded in the drawer.

[0009] In some embodiments of the first aspect of this application, the counterweight subunit includes a plurality of counterweight blocks spaced apart and connected by a flexible layer, wherein the topmost counterweight block is made of a magnetic material.

[0010] In some embodiments of the first aspect of this application, the adjusting mechanism includes: A sliding member is disposed in the second groove and slides in the vertical direction with the second groove. A plurality of electromagnets are disposed on the sliding member, and the electromagnets are disposed in a one-to-one correspondence with the counterweight subunits. The electromagnets are used to attract the top counterweight block of the corresponding counterweight subunit. A pull rope is fixedly installed on the top of the sliding member; A rotating shaft is used to wind the pull rope. As the rotating shaft rotates, the pull rope shortens / extends, controlling the rise / fall of the slider. A power mechanism to drive the rotating shaft to rotate.

[0011] In some embodiments of the first aspect of this application, the power mechanism includes a motor, the output shaft of which is connected to the rotating shaft.

[0012] In some embodiments of the first aspect of this application, a plurality of baffles are arranged side by side in the counterweight groove to separate adjacent counterweight subunits.

[0013] In some embodiments of the first aspect of this application, the method for calculating the first number of counterweight subunits to be adjusted based on the weight of the contents inside the drawer is as follows: The weight of the contents of the drawer is multiplied by a first proportional coefficient and then rounded to obtain the first number of the counterweight subunits that need to be adjusted.

[0014] In some embodiments of the first aspect of this application, the method for determining the first proportionality coefficient is as follows: Adjust all counterweight subunits to the counterweight position; Pull the drawer out completely and place a fixed weight inside. Adjust each counterweight subunit from the counterweight state to the initial state until the cabinet tilts forward, and record the number of counterweight subunits currently in the counterweight state. Calculate the first proportionality coefficient using the following formula:

[0015] in, Represents the first proportionality coefficient; This represents the number of counterweight subunits currently in a counterweight state; This indicates the weight currently detected by the weight detection agency in the drawer.

[0016] In some embodiments of the first aspect of this application, the counterweight groove is provided with a transition groove at the junction of the first groove and the second groove, and the transition groove is inclined.

[0017] Compared with the prior art, this application has the following advantages: This application provides counterweight grooves consisting of a first groove and a second groove connected together on the bottom and rear sides of the cabinet, and sets several counterweight sub-units with switchable positions in the counterweight grooves; the state of the drawer is determined by a displacement detection mechanism, and when the drawer is displaced, the corresponding number of counterweight sub-units are adjusted to the second groove on the rear side of the cabinet in combination with the weight of the contents loaded in the drawer, so that the overall center of gravity is shifted backward when the drawer is pulled out, thereby maintaining the overall stability of the office cabinet.

[0018] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0019] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, wherein: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0020] Figure 1 A schematic diagram of the overall structure of this application is shown.

[0021] Figure 2 A schematic diagram of the drawer structure of this application is shown.

[0022] Figure 3 A cross-sectional view of the counterweight subunit of this application in its initial state is shown.

[0023] Figure 4 A cross-sectional view of the counterweight subunit of this application in the counterweight state is shown.

[0024] Figure 5 A schematic diagram of the counterweight subunit structure of this application is shown.

[0025] Figure 6 A schematic diagram of the sliding component structure of this application is shown.

[0026] Figure 7 A schematic diagram of the internal structure of the counterweight groove of this application is shown.

[0027] Figure 8 A schematic diagram of some of the counterweight subunits of this application in the counterweight state is shown.

[0028] Explanation of reference numerals in the attached figures: 100. Cabinet body; 110. Receiving cavity; 200. Drawer; 210. Base plate; 300. Displacement detection mechanism; 400. Weight detection mechanism; 410. Detection plate; 420. Weight sensor; 500, counterweight groove; 510, first groove body; 520, second groove body; 530, transition groove; 540, stop bar; 550, groove body; 600, counterweight subunit; 610, counterweight block; 620, flexible layer; 700. Adjustment mechanism; 710. Sliding component; 711. Electromagnet; 720. Pull rope; 730. Rotating shaft; 740. Power mechanism; 750. Mounting slot. Detailed Implementation

[0029] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] This embodiment provides an anti-tipping office cabinet with a movable counterweight subunit. When the drawer is pulled out, the overall center of gravity shifts backward, thereby maintaining the overall stability of the office cabinet.

[0031] Please refer to Figure 1, Figure 3 and Figure 4 The anti-tipping office cabinet includes the following components: The cabinet 100 has a front-opening accommodating cavity 110 for installing drawers 200.

[0032] Drawer 200 is slidably disposed within the receiving cavity 110. Drawer 200 can slide horizontally into and out of the receiving cavity 110 to facilitate the retrieval of items. It is worth noting that a slide rail (not shown in the figure) is provided between the outer wall of drawer 200 and the inner wall of receiving cavity 110 to enable the sliding installation of drawer 200. It is also worth mentioning that there can be multiple drawers 200.

[0033] The displacement detection mechanism 300 is used to detect the displacement of the drawer 200.

[0034] For details, please refer to Figure 2 and Figure 4 The displacement detection mechanism 300 includes a distance sensor, which is installed at the end of the drawer 200 to detect the distance between the end of the drawer 200 and the rear side of the receiving cavity 110 as the displacement of the drawer 200. The displacement It can directly reflect the position where the drawer 200 is pulled out, and therefore can represent whether the drawer 200 is pulled out.

[0035] Preferably, the ranging sensor can be an ultrasonic sensor or an infrared photodiode, preferably an infrared photodiode.

[0036] The weight detection mechanism 400 is used to detect the weight of the contents loaded in the drawer 200.

[0037] For details, please refer to Figure 2 , Figure 3 and Figure 4 The weight detection mechanism 400 includes a detection plate 410 located above the bottom plate 210 of the drawer 200. The detection plate 410 and the drawer 200 are in a sliding or clearance fit and can move freely in the vertical direction. A plurality of weighing sensors 420 are disposed between the bottom plate 210 and the detection plate 410. The sum of the weights detected by the plurality of weighing sensors 420 is taken as the weight of the contents loaded in the drawer 200. .

[0038] Specifically, four weighing sensors 420 are preferably provided and evenly distributed in the four corners between the base plate 210 and the detection plate 410.

[0039] Counterweight slot 500, please refer to Figure 3, Figure 4 and Figure 7 It includes a first groove 510 located on the bottom side of the cabinet 100 and a second groove 520 located on the rear side of the cabinet 100, and the first groove 510 and the second groove 520 are connected.

[0040] For ease of processing, the counterweight groove 500 is set on a groove body 550. The groove body 550 is L-shaped in general. The groove body 550 and the cabinet 100 are designed separately and are connected by bolts or welded into one piece.

[0041] Several counterweight sub-units 600 are located within the counterweight groove 500.

[0042] For details, please refer to Figure 5 The counterweight subunit 600 includes a plurality of counterweight blocks 610 spaced apart, the plurality of counterweight blocks 610 being connected by a flexible layer 620, wherein the topmost counterweight block 610 is made of magnetic material.

[0043] Preferably, in order to ensure the stability of the flexible connection between the counterweights 610, a flexible layer 620 is provided on both sides of each counterweight 610. That is, the two flexible layers 620 wrap all the counterweights 610 inside.

[0044] The flexible layer 620 is preferably made of flexible PVC or fabric.

[0045] It is worth mentioning that, please refer to Figure 8 In this embodiment, a total of 8 counterweight subunits 600 are provided, and all counterweight subunits 600 are arranged side by side. Several baffles 540 are arranged side by side in the counterweight groove 500 to separate adjacent counterweight subunits 600.

[0046] The adjustment mechanism 700 is used to adjust the position of the counterweight subunit 600 within the counterweight groove 500.

[0047] like Figure 3 As shown, in the initial state, the counterweight subunit 600 is located inside the first groove 510, and at this time the counterweight subunit 600 is located on the bottom side of the cabinet 100.

[0048] It is worth mentioning that in this initial state, the counterweight subunit 600 is not completely located in the first groove 510, but mostly located in the first groove 510. Its top needs to move in coordination with the adjustment mechanism 700. At least the counterweight 610, which is made of magnetic material at the top, needs to be located in the second groove 520.

[0049] like Figure 4As shown, in the counterweight state, the counterweight subunit 600 is located within the second groove 520. At this time, the counterweight subunit 600 is positioned at the rear of the cabinet 100, causing the local center of gravity to shift backward to counteract the forward shift of the center of gravity caused by the pulled-out drawer 200. This ensures that the overall center of gravity of the cabinet 100 is located in the middle, preventing the cabinet from tilting forward due to the drawer 200 being pulled out.

[0050] To facilitate the movement of the counterweight subunit 600 in the counterweight groove 500, especially its smooth movement at the junction of the first groove 510 and the second groove 520, the counterweight groove 500 is provided with a transition groove 530 at the junction of the first groove 510 and the second groove 520. The transition groove 530 is inclined and has a rounded corner to prevent the counterweight subunit 600 from getting stuck at the junction of the first groove 510 and the second groove 520 during movement.

[0051] For details, please refer to Figure 3 , Figure 4 and Figure 8 The adjustment mechanism 700 includes: The sliding member 710 is elongated in shape and is disposed within the second groove 520, slidingly engaging with the second groove 520 in the vertical direction. (Please refer to...) Figure 6 The sliding member 520 is provided with a plurality of electromagnets 711, and each electromagnet 711 is provided in a one-to-one correspondence with a counterweight subunit 600. The electromagnets 711 are used to attract the topmost counterweight block 610 of the corresponding counterweight subunit 600.

[0052] When some or all of the electromagnets 711 are turned on, the corresponding counterweight subunit 600 is attracted, so that the corresponding counterweight subunit 600 and the slider 710 form a fixed engagement, and the slider 710 can drive the counterweight subunit 600 to move synchronously.

[0053] A pull rope 720, one end of which is fixedly disposed on the top of the sliding member 710.

[0054] The rotating shaft 730 is used to wind the pull rope 720. As the rotating shaft 730 rotates, the pull rope 720 shortens / extends, controlling the sliding member 710 to rise / fall, thereby driving the attracted counterweight subunit 600 to move.

[0055] Specifically, such as Figure 4 As shown, when the rotating shaft 720 rotates and the pull rope 720 shortens, the sliding member 710 drives the counterweight subunit 600 to rise, causing it to enter the second groove 520 from the first groove 510. Conversely, as... Figure 3As shown, when the rotating shaft 720 rotates in the opposite direction and the pull rope 720 extends, the sliding member 710 drives the counterweight subunit 600 to descend, causing it to enter the first groove 510 from the second groove 520.

[0056] A power mechanism 740 is provided to drive the rotating shaft 730 to rotate. Specifically, the power mechanism 740 includes a motor, the output shaft of which is connected to the rotating shaft 730 to transmit the rotational power thereon.

[0057] In order to install the rotating shaft 730 and the power mechanism 740, this application provides a corresponding mounting groove 750 on the groove body 550, which is located above the second groove body 520.

[0058] The controller (not shown in the figure) receives the displacement detected by the displacement detection mechanism 300. The weight detected by the weight testing agency 400 And accordingly, control the operation of the adjustment mechanism 700, especially the operation of the corresponding electromagnet 711 and the power mechanism 740.

[0059] Specifically, when the displacement of the drawer 200 Reaching the set threshold According to the weight of the contents loaded in the drawer 200 Calculate the first quantity of the counterweight subunit 600 that needs to be adjusted. And trigger the adjustment mechanism 700 to work, to adjust the first quantity The counterweight subunit is adjusted to the counterweight state by 600.

[0060] The weight of the contents inside drawer 200 At different times, the degree to which the overall center of gravity of the cabinet 100 shifts forward varies, and the number of counterweight subunits 600 that need to be adjusted to counteract this forward shift also varies. Simply put, the weight of the contents inside the pulled-out drawer 200... The larger the value, the greater the number of counterweight subunits 600 that need to be adjusted.

[0061] Specifically, based on the weight of the contents loaded in the drawer 200 Calculate the first quantity of the counterweight subunit 600 that needs to be adjusted. The method is as follows: The weight of the contents of the drawer Multiply by the first proportionality factor The result is then rounded to obtain the first number of the counterweight subunits 600 that need to be adjusted. .

[0062] That is, for The first quantity is obtained by rounding the value. It is worth mentioning that the rounding mentioned in this solution can be rounding up, rounding down, or rounding to the nearest integer.

[0063] In this scheme, in order to obtain the aforementioned first quantity more accurately... First proportionality coefficient The value of this adjustment is particularly important. If the value is too small, the counterweight subunit 600 will be insufficient to offset the forward shift of the center of gravity caused by the drawer 200 being pulled out, and there will still be a risk of the cabinet 100 tipping forward. Conversely, if the value is too large, too many counterweight subunits 600 will be adjusted, resulting in redundant energy consumption of the adjustment mechanism 700.

[0064] Specifically, the first proportionality coefficient The method for determining it is as follows: Adjust all counterweight subunits 600 to the counterweight state, that is, the counterweight subunits 600 are in the second tank 520; Pull out the drawer 200 completely, and place a fixed weight inside the drawer 200. The fixed weight can be determined by the user tester, and is preferably half of the full load of the drawer 200. Adjust each counterweight subunit 600 from its counterweight state to its initial state one by one until the cabinet 100 tilts forward, and record the number of counterweight subunits currently in the counterweight state. ; Calculate the first proportionality coefficient using the following formula:

[0065] in, Represents the first proportionality coefficient; This represents the number of counterweight subunits currently in a counterweight state; This indicates the weight currently detected by the weight detection agency in the drawer.

[0066] This represents the minimum number of counterweight sub-units required to maintain the overall balance of cabinet 100 under the current load conditions in drawer 200. Therefore, it ensures the stability of this first proportional coefficient. The calculated first quantity N is the minimum quantity required to ensure that the cabinet will not tip over.

[0067] It is worth mentioning that after determining the first number N of the counterweight subunits 600 to be adjusted, it is also necessary to further determine the objects to be adjusted among all the counterweight subunits 600.

[0068] Preferably, all counterweight subunits 600 are numbered, and the number of the counterweight subunits 600 arranged side by side gradually increases from the middle to both sides; After calculating the first quantity N, the counterweight subunit 600 with the smallest sequence number is identified as the object to be adjusted.

[0069] by Figure 8 For example, eight counterweight subunits 600 are arranged side by side, with their serial numbers as follows: 7, 5, 3, 1, 2, 4, 6, 8. When the calculated first quantity N is 4, the counterweight subunits 600 with serial numbers 1, 2, 3, and 4 (i.e., the four counterweight subunits 600 in the center) are identified as the objects to be adjusted and are adjusted to the counterweight state.

[0070] Therefore, it can be ensured that the adjusted counterweight subunit 600 is symmetrically distributed about the center of the cabinet 100 in the direction perpendicular to the pull-out of the drawer 200, thus avoiding the overall lateral shift of the cabinet 100 in terms of its center of gravity after adjustment.

[0071] It is worth mentioning that, in the case of multiple drawers 200, in the anti-tipping office cabinet, the displacement detection mechanism 300, the weight detection mechanism 400, and the controller only operate on the same drawer, and different drawers are independent of each other.

[0072] Through the above solution, this application provides a counterweight groove consisting of a first groove and a second groove connected together on the bottom and rear sides of the cabinet, and sets several counterweight sub-units with switchable positions in the counterweight groove; the state of the drawer is determined by a displacement detection mechanism, and when the drawer is displaced, the corresponding number of counterweight sub-units are adjusted to the second groove on the rear side of the cabinet in combination with the weight of the contents loaded in the drawer, so that the overall center of gravity is shifted backward when the drawer is pulled out, thereby maintaining the overall stability of the office cabinet.

[0073] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this application can be achieved, and this is not limited herein.

[0074] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0075] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An anti-tipping office cabinet, characterized in that, include: The cabinet has a receiving cavity with a front opening. The drawer is slidably disposed within the accommodating cavity; A displacement detection mechanism is used to detect the displacement of the drawer; A weight detection mechanism is used to detect the weight of the contents loaded in the drawer; The counterweight groove includes a first groove located on the bottom side of the cabinet and a second groove located on the rear side of the cabinet, and the first groove and the second groove are connected. Several counterweight sub-units, wherein the counterweight sub-units are located within the counterweight groove; An adjustment mechanism is used to adjust the position of the counterweight subunit in the counterweight groove; in the initial state, the counterweight subunit is located in the first groove; in the counterweight state, the counterweight subunit is located in the second groove. When the displacement of the drawer reaches a set threshold, the controller calculates the first number of counterweight subunits that need to be adjusted based on the weight of the contents of the drawer, and triggers the adjustment mechanism to adjust the first number of counterweight subunits to the counterweight state.

2. The anti-tipping office cabinet according to claim 1, characterized in that, The displacement detection mechanism includes a distance sensor, which is installed at the end of the drawer to detect the distance between the end of the drawer and the rear side of the accommodating cavity as the displacement of the drawer.

3. The anti-tipping office cabinet according to claim 1, characterized in that, The weight detection mechanism includes a detection plate located above the bottom plate of the drawer, and a plurality of weighing sensors are arranged between the bottom plate and the detection plate. The sum of the weights detected by the plurality of weighing sensors is taken as the weight of the contents loaded in the drawer.

4. The anti-tipping office cabinet according to claim 1, characterized in that, The counterweight subunit includes several counterweight blocks spaced apart and connected by a flexible layer, wherein the topmost counterweight block is made of magnetic material.

5. The anti-tipping office cabinet according to claim 4, characterized in that, The adjustment mechanism includes: A sliding member is disposed in the second groove and slides in the vertical direction with the second groove. A plurality of electromagnets are disposed on the sliding member, and the electromagnets are disposed in a one-to-one correspondence with the counterweight subunits. The electromagnets are used to attract the top counterweight block of the corresponding counterweight subunit. A pull rope is fixedly installed on the top of the sliding member; A rotating shaft is used to wind the pull rope. As the rotating shaft rotates, the pull rope shortens / extends, controlling the rise / fall of the slider. A power mechanism to drive the rotating shaft to rotate.

6. The anti-tipping office cabinet according to claim 4, characterized in that, The power mechanism includes a motor, and the output shaft of the motor is connected to the rotating shaft.

7. The anti-tipping office cabinet according to claim 1, characterized in that, Several baffles are arranged side by side in the counterweight groove to separate adjacent counterweight subunits.

8. The anti-tipping office cabinet according to claim 1, characterized in that, The method for calculating the first number of counterweight subunits that need to be adjusted based on the weight of the contents of the drawer is as follows: The weight of the contents of the drawer is multiplied by a first proportional coefficient and then rounded to obtain the first number of the counterweight subunits that need to be adjusted.

9. The anti-tipping office cabinet according to claim 8, characterized in that, The method for determining the first proportionality coefficient is as follows: Adjust all counterweight subunits to the counterweight position; Pull the drawer out completely and place a fixed weight inside. Adjust each counterweight subunit from the counterweight state to the initial state until the cabinet tilts forward, and record the number of counterweight subunits currently in the counterweight state. Calculate the first proportionality coefficient using the following formula: in, Represents the first proportionality coefficient; This represents the number of counterweight subunits currently in a counterweight state; This indicates the weight currently detected by the weight detection agency in the drawer.

10. The anti-tipping office cabinet according to claim 1, characterized in that, The counterweight groove has a transition groove at the junction of the first groove and the second groove, and the transition groove is inclined.

Images