A scalable logistics PLC cabinet and its usage method

Abstract

This invention relates to the technical field of control cabinets, specifically an expandable logistics PLC cabinet and its usage method. It includes a frame structure and multiple side panels. The frame structure has a retractable frame at its bottom. The retractable frame includes a set of telescopic columns and telescopic locking components mounted on the columns. A drive control unit is located at the intersection of two sets of telescopic columns, simultaneously controlling the telescopic locking components in both directions. The drive control unit includes a support cylinder and a pushing component mounted on the support cylinder. Two deflection mechanisms on the telescopic columns can respectively press the telescopic locking components in both directions. This invention, through the setting of the telescopic frame at the bottom of the cabinet and the placement of a single drive control unit at the intersection of two sets of telescopic columns, allows for the simultaneous unlocking of the telescopic locking components in both directions by activating a single pushing component. Furthermore, the precise spacing design ensures that the corresponding telescopic length is fixed each time it is locked, thereby ensuring precise symmetry in the expansion length of the telescopic columns on both sides.

Description

Technical Field

[0001] This invention relates to the technical field of control cabinets, specifically an expandable logistics PLC cabinet and its usage method. Background Technology

[0002] PLC control cabinets are core control devices in industrial and logistics automation systems, widely used in power, manufacturing, and other fields. With the rapid development of the logistics industry, the demand for logistics PLC control cabinets is constantly increasing, and their functional requirements and technical standards are also continuously rising. Currently, some PLC control cabinets adopt a modular frame design, with the cabinet consisting of a main frame, functional unit partitions, side panels, and other components. However, the cabinet's reserved expansion space is limited, typically unable to support future equipment upgrades and module additions. Faced with ever-changing market demands, control cabinets struggle to respond and adapt quickly.

[0003] Traditional control cabinets often feature a fixed bottom frame design, making them inseparable from the base. This can lead to structural deformation during transportation, affecting the stability of the cabinet after installation. Therefore, some existing control cabinets are equipped with a modular bottom frame design, incorporating expansion mounting positions. Future upgrades only require adding modules without reconstructing the overall structure. However, adjusting the bottom frame typically involves bolts, requiring adjustment and locking of individual side rods. Since the side rods are adjusted independently, it's difficult to ensure that opposite rods are perfectly equidistant, potentially causing frame misalignment. This misalignment compromises the cabinet's stability after installation and complicates future expansion. Summary of the Invention

[0004] The purpose of this invention is to provide an expandable logistics PLC cabinet to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An expandable logistics PLC cabinet includes a frame structure and multiple side panels. The bottom of the frame structure is provided with a telescopic frame, and each of the four ends of the telescopic frame is connected to a column.

[0007] The retractable frame includes four sets of telescopic columns, and the multiple telescopic columns are connected end to end in sequence.

[0008] A telescopic locking component is installed on the telescopic column. The telescopic column can be locked after its telescopic length is adjusted. A drive control component is provided at the intersection of the two sets of telescopic columns to control the telescopic locking components in both directions at the same time.

[0009] The drive control component includes a support cylinder and a pushing assembly disposed on the support cylinder. When the pushing assembly performs the pushing operation, two sets of deflection mechanisms disposed on the telescopic column respectively squeeze the telescopic locking member in two directions.

[0010] The scalable logistics PLC cabinet described above: the telescopic column includes a first connecting column and a second connecting column, the second connecting column has an embedded groove, one end of the first connecting column is slidably inserted into the embedded groove, and one end of the first connecting column has a protrusion that can penetrate the second connecting column.

[0011] The expandable logistics PLC cabinet as described above: the telescopic locking component includes a limiting plate, the limiting plate is slidably disposed on the second connecting column, and the second connecting column is provided with an elastic connecting component connected to the limiting plate;

[0012] A first straight groove is formed on one end of the limiting plate facing the second connecting post, and a plurality of second straight grooves communicating with the first straight groove are provided along the length direction of the limiting plate. The second straight grooves are perpendicular to the first straight groove.

[0013] The scalable logistics PLC cabinet described above: the elastic connector includes a plug-in cylinder, one end of which is connected to the second connecting post, and a plug-in rod is slidably inserted into the other end, with the end of the plug-in rod away from the plug-in cylinder connected to the limiting plate;

[0014] It also includes a spring, which is sleeved on the plug rod, with one end of the spring abutting against the plug rod and the other end abutting against the inner end of the plug tube.

[0015] The scalable logistics PLC cabinet described above: the pushing component includes a threaded rod, which is rotatably mounted inside the support cylinder. A threaded sleeve is threadedly connected to the threaded rod, and a collar is provided along the axial direction of the threaded sleeve.

[0016] The expandable logistics PLC cabinet as described above: the two deflection mechanisms are respectively sleeved on the collar, and the second connecting column is provided with a guide mechanism to limit the rotation of the two deflection mechanisms.

[0017] The scalable logistics PLC cabinet described above: the guiding mechanism includes a guide plate, the guide plate is arranged in an arc shape, and the axis of the guide plate coincides with that of the collar. Two first guide grooves and a second guide groove with different heights are formed on the guide plate.

[0018] The scalable logistics PLC cabinet described above: the deflection mechanism includes a connecting hoop, which is sleeved on the collar, and a guide post is provided on the outer wall of the connecting hoop that is rotatably connected to the guide plate;

[0019] It also includes a deflection plate, one end of which is connected to the connecting hoop, and a groove is formed on the other end. A receiving plate is installed on the limiting plate, and a connecting column that can slide and connect with the groove is provided on the receiving plate.

[0020] The scalable logistics PLC cabinet described above: a first threaded groove and a second threaded groove are formed on the collar, and balls that slide and adapt to the first threaded groove or the second threaded groove are movably arranged on the inner walls of the two connecting clamps.

[0021] A method of using a scalable logistics PLC cabinet as described in any of the above claims includes the following specific steps:

[0022] Step 1: Before assembling the cabinet, adjust the assembled telescopic frame according to the required dimensions of the cabinet;

[0023] Step 2: Start the push component to work. When the push action is performed, it drives the two deflection mechanisms to deflect simultaneously and acts on the telescopic locking parts in two directions. After the telescopic locking parts release the limit on the first connecting post, the first connecting post can move freely relative to the second connecting post.

[0024] Step 3: When adjusting the telescopic length and width on the telescopic frame, they do not interfere with each other and do not affect the subsequent telescopic locking components locking the telescopic columns in both directions simultaneously.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] The cabinet's dimensions can be flexibly adjusted during assembly by using a telescopic frame at the bottom of the cabinet to accommodate the installation needs of additional PLC modules.

[0027] A single drive control unit is installed at the intersection of two sets of telescopic columns. Activating a single push component can simultaneously unlock the telescopic locking components in both directions. This setup allows a single drive source to control the release of the telescopic locking components in both directions simultaneously, eliminating the need for separate unlocking operations by operators. Under the constraint of the elastic connector, the telescopic locking component moves linearly relative to the second connecting column, thereby releasing the limiting lock of the telescopic locking component on the first connecting column. This allows the telescopic columns in both directions to freely adjust their support length without interference between the adjustments.

[0028] The multiple second linear grooves on the limit plate allow for multiple different locking positions, enabling the telescopic column to be adjusted to multiple fixed length levels. The equidistant design between adjacent second linear grooves ensures that when a single first connecting column moves relative to the second connecting column, the engagement between the protruding column and the second linear groove keeps the expansion length within a controllable range. The precise spacing design ensures that the corresponding telescopic length is fixed each time it is locked, thereby ensuring that the expansion length of the telescopic columns on both sides is precisely symmetrical, maintaining the overall structural balance and preventing the cabinet from tilting or deforming due to unilateral adjustment. Attached Figure Description

[0029] Figure 1 This is a structural diagram of an expandable logistics PLC cabinet.

[0030] Figure 2 This is a structural diagram of the skeleton in an expandable logistics PLC cabinet.

[0031] Figure 3 This is a structural diagram of the first and second connecting columns in an expandable logistics PLC cabinet.

[0032] Figure 4 This is a structural diagram of the telescopic frame in an expandable logistics PLC cabinet.

[0033] Figure 5 This is a structural diagram of the first connecting column and the protruding column in an expandable logistics PLC cabinet.

[0034] Figure 6 This is a structural diagram of the telescopic locking component in an expandable logistics PLC cabinet.

[0035] Figure 7 This is a structural diagram of the telescopic locking component in an expandable logistics PLC cabinet from another angle.

[0036] Figure 8 This is a structural diagram of the flexible connector in an expandable logistics PLC cabinet.

[0037] Figure 9 This is a schematic diagram of the drive control components in an expandable logistics PLC cabinet.

[0038] Figure 10 This is a structural diagram of the push component and guide mechanism in an expandable logistics PLC cabinet.

[0039] Figure 11 This is a schematic diagram of the deflection mechanism in an expandable logistics PLC cabinet.

[0040] Figure 12 This is a structural diagram of the push component in an expandable logistics PLC cabinet.

[0041] In the diagram: 1. Side plate; 2. Column; 3. First connecting column; 301. Protruding column; 4. Second connecting column; 5. Deflection plate; 501. Slide groove; 6. Support plate; 601. Movable column; 7. Limiting plate; 701. First straight groove; 702. Second straight groove; 8. Insert sleeve; 9. Insert rod; 10. Spring; 11. Support sleeve; 1101. Strip groove; 12. Threaded rod; 13. Guide plate; 1301. First guide groove; 1302. Second guide groove; 14. Threaded sleeve; 1401. Strip block; 15. Collar; 1501. First threaded groove; 1502. Second threaded groove; 16. Connecting hoop; 1601. Ball bearing; 1602. Guide column. Detailed Implementation

[0042] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0043] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0044] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0045] Please see Figures 1-12 In this embodiment of the invention, an expandable logistics PLC cabinet includes a frame structure and multiple side panels 1. The bottom of the frame structure is provided with a retractable frame, and the four ends of the retractable frame are respectively connected to columns 2.

[0046] The retractable frame includes four sets of telescopic columns, and the multiple telescopic columns are connected end to end in sequence.

[0047] A telescopic locking component is installed on the telescopic column. The telescopic column can be locked after its telescopic length is adjusted. A drive control component is provided at the intersection of the two sets of telescopic columns to control the telescopic locking components in both directions at the same time.

[0048] The drive control component includes a support cylinder 11 and a pushing component disposed on the support cylinder 11. When the pushing component performs the pushing operation, two sets of deflection mechanisms disposed on the telescopic column respectively squeeze the telescopic locking member in two directions.

[0049] In this embodiment, when expanding the cabinet's frame structure, the support area of ​​the bottom telescopic frame needs to be adjusted. Multiple telescopic columns, assembled without disassembly, can be pushed using a push assembly. During the pushing action, two sets of deflection mechanisms on these columns deflect simultaneously in opposite directions. The deflection mechanisms press against the telescopic locking components. Under the constraint of the telescopic columns, the telescopic locking components move linearly, thereby releasing the locking mechanism's restriction on the telescopic columns. This allows the telescopic columns in both directions to freely adjust their support length. After adjustment, the telescopic locking components can lock the telescopic columns again without disassembling the entire telescopic frame. By activating a push assembly at the intersection of two telescopic columns, the telescopic locking in both directions can be unlocked simultaneously. Furthermore, the adjustments of the telescopic columns in both directions do not interfere with each other. Operators can quickly adjust the planar dimensions of the telescopic frame, flexibly adjust the cabinet size, and adapt to the installation requirements of newly added PLC module expansion space.

[0050] As a further embodiment of the present invention, please refer to... Figures 3-7 The telescopic column includes a first connecting column 3 and a second connecting column 4. An embedded groove is formed in the second connecting column 4. One end of the first connecting column 3 is slidably inserted into the embedded groove, and a protrusion 301 that can penetrate the second connecting column 4 is formed at one end of the first connecting column 3.

[0051] The telescopic locking component includes a limiting plate 7, which is slidably disposed on the second connecting post 4, and the second connecting post 4 is provided with an elastic connecting component connected to the limiting plate 7.

[0052] A first straight groove 701 is formed on one end of the limiting plate 7 facing the second connecting post 4, and a plurality of second straight grooves 702 are provided along the length direction of the limiting plate 7, which are connected to the first straight groove 701. The second straight grooves 702 are perpendicular to the first straight groove 701.

[0053] In the initial state, the protruding post 301 is located in the second straight groove 702. At this time, the limiting plate 7 locks the first connecting post 3. When it is necessary to adjust the length of the telescopic post, the limiting plate 7 is moved relative to the second connecting post 4 by external force, so that the second straight groove 702 is disengaged from the protruding post 301, and the protruding post 301 is located in the first straight groove 701. At this time, the first connecting post 3 can extend and retract freely. After adjusting to the required length, the push assembly is reset. Under the action of the deflection mechanism and the elastic connector, the limiting plate 7 is reset, and the protruding post 301 falls back into the second straight groove 702, completing the relocking. The setting of multiple second straight grooves 702 can realize multiple different locking positions, so that the telescopic post can be adjusted at multiple fixed length levels to meet different usage needs.

[0054] It should be added that: the distance between two adjacent second straight grooves 702 is equal, so that when a single first connecting post 3 moves relative to the second connecting post 4, the expansion length between the first connecting post 3 and the second connecting post 4 is always within a controllable range through the engagement of the protrusion 301 with the second straight groove 702. This allows the telescopic post to be adjusted at multiple fixed length positions. The precise spacing design ensures that the corresponding telescopic length is fixed each time it is locked. Under non-interfering operation, it can ensure that the expansion length of the telescopic posts on both sides is precisely symmetrical and the overall structure remains balanced.

[0055] As a further embodiment of the present invention, please refer to... Figure 8 As a further embodiment of the present invention, please refer to the figure. The elastic connector includes a plug-in cylinder 8. One end of the plug-in cylinder 8 is connected to the second connecting post 4, and a plug-in rod 9 is slidably inserted into the other end. The end of the plug-in rod 9 away from the plug-in cylinder 8 is connected to the limiting plate 7.

[0056] It also includes a spring 10, which is sleeved on the plug rod 9. One end of the spring 10 abuts against the plug rod 9, and the other end abuts against the inner end of the plug tube 8.

[0057] When the limiting plate 7 is locked to the protrusion 301, the spring 10 is in a pre-compressed state. The continuous elastic force provided by the spring 10 keeps the limiting plate 7 locked when there is no external force, preventing the telescopic column from being accidentally unlocked by the operator. When the limiting plate 7 unlocks the protrusion 301, the movement of the limiting plate 7 drives the plug rod 9 to move synchronously. At this time, the movement of the plug rod 9 relative to the plug cylinder 8 causes the spring 10 to be further compressed, increasing the stored elastic potential energy. This allows the pushing force and the elastic force of the spring 10 to drive the limiting plate 7 to quickly reset and lock the protrusion 301 when the limiting plate 7 locks the protrusion 301 again. This ensures that the support length of the telescopic column can be quickly maintained and stabilized, avoiding the deviation of the support length of the telescopic column due to accidental contact during the adjustment process.

[0058] As a further embodiment of the present invention, please refer to... Figure 9 , Figure 10 and Figure 12 The pushing component includes a threaded rod 12, which is rotatably mounted inside the support cylinder 11. A threaded sleeve 14 is threadedly connected to the threaded rod 12, and a collar 15 is provided along the axial direction of the threaded sleeve 14.

[0059] The two deflection mechanisms are respectively sleeved on the collar 15, and the second connecting post 4 is provided with a guide mechanism to limit the rotation of the two deflection mechanisms.

[0060] The guiding mechanism includes a guide plate 13, which is arranged in an arc shape and coincides with the axis of the collar 15. Two first guide grooves 1301 and second guide grooves 1302 with different heights are formed on the guide plate 13.

[0061] Preferably, the threaded sleeve 14 is provided with a strip block 1401, and the inner wall of the support cylinder 11 is formed with a strip groove 1101 that is slidably adapted to the strip block 1401. Under the sliding cooperation of the strip block 1401 and the strip groove 1101, the threaded sleeve 14 and the support cylinder 11 are slidably connected.

[0062] When the position of the limiting plate 7 is unlocked, the threaded rod 12 is manually adjusted to rotate. Under the guidance and restriction of the strip block 1401 and the strip groove 1101, the threaded sleeve 14 moves linearly along the axis of the threaded rod 12. As the threaded sleeve 14 moves down, it drives the collar 15 to move down synchronously. At this time, under the restriction of the guide plate 13, when the rotation of the collar 15 is transmitted to the deflection mechanism, the two deflection mechanisms deflect in opposite directions. The limiting plates 7 on the telescopic columns in both directions can simultaneously release the locking of the protrusion 301, and the extension length of the telescopic column does not affect the simultaneous locking and unlocking actions of the two limiting plates 7.

[0063] As a further embodiment of the present invention, please refer to... Figure 11 The deflection mechanism includes a connecting hoop 16, which is sleeved on the collar 15, and a guide post 1602 that is rotatably connected to the guide plate 13 is provided on the outer wall of the connecting hoop 16.

[0064] It also includes a deflection plate 5, one end of which is connected to the connecting hoop 16, and a groove 501 is formed on the other end. A receiving plate 6 is installed on the limiting plate 7, and a movable column 601 that can slide and connect with the groove 501 is provided on the receiving plate 6.

[0065] The collar 15 has a first threaded groove 1501 and a second threaded groove 1502, and the inner walls of the two connecting clamps 16 are movably provided with balls 1601 that slide and adapt to the first threaded groove 1501 or the second threaded groove 1502.

[0066] When the aforementioned collar 15 rotates, its first threaded groove 1501 and second threaded groove 1502 respectively squeeze the two balls 1601. When the connecting hoop 16 is subjected to an inclined force, the two guide posts 1602 slide with the first guide groove 1301 and the second guide groove 1302 respectively, so that the two connecting hoops 16 rotate simultaneously and in opposite directions. The rotation of the connecting hoop 16 drives the deflection plate 5 to rotate synchronously. Under the restriction of the plug rod 9 and the plug cylinder 8, the limiting plate 7 can only perform linear motion, so that during the deflection of the deflection plate 5, the movable post 601 slides relative to each other in the slide groove 501, realizing the compound switching of the rotation action of the deflection plate 5 and the linear action of the limiting plate 7, thereby quickly completing the unlocking and locking actions of the telescopic posts in two directions.

[0067] A method of using a scalable logistics PLC cabinet as described in any of the above claims includes the following specific steps:

[0068] Step 1: Before assembling the cabinet, adjust the assembled telescopic frame according to the required dimensions of the cabinet;

[0069] Step 2: Start the push component to work. When the push action is performed, the two deflection mechanisms are driven to deflect simultaneously and act on the telescopic locking parts in two directions. After the telescopic locking parts release the limit on the first connecting post 3, the first connecting post 3 can move freely relative to the second connecting post 4.

[0070] Step 3: When adjusting the telescopic length and width on the telescopic frame, they do not interfere with each other and do not affect the subsequent telescopic locking components locking the telescopic columns in both directions simultaneously.

[0071] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0072] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An expandable logistics PLC cabinet, comprising a frame structure and multiple side panels (1), wherein a retractable frame is provided at the bottom of the frame structure, and columns (2) are respectively connected to the four ends of the retractable frame, characterized in that... ； The retractable frame includes four sets of telescopic columns, and the multiple telescopic columns are connected end to end in sequence. A telescopic locking component is installed on the telescopic column. The telescopic column can be locked after its telescopic length is adjusted. A drive control component is provided at the intersection of the two sets of telescopic columns to control the telescopic locking components in both directions at the same time. The drive control component includes a support cylinder (11) and a push assembly disposed on the support cylinder (11). When the push assembly performs the push operation, two sets of deflection mechanisms disposed on the telescopic column respectively squeeze the telescopic locking member in two directions.

2. The expandable logistics PLC cabinet according to claim 1, characterized in that, The telescopic column includes a first connecting column (3) and a second connecting column (4). The second connecting column (4) has an embedded groove. One end of the first connecting column (3) is slidably inserted into the embedded groove, and one end of the first connecting column (3) has a protrusion (301) that can penetrate the second connecting column (4).

3. The expandable logistics PLC cabinet according to claim 2, characterized in that, The telescopic locking component includes a limiting plate (7), which is slidably disposed on the second connecting post (4), and the second connecting post (4) is provided with an elastic connecting component connected to the limiting plate (7); The limiting plate (7) has a first straight groove (701) formed on one end facing the second connecting column (4), and a plurality of second straight grooves (702) connected to the first straight groove (701) are provided along the length direction of the limiting plate (7). The second straight grooves (702) are perpendicular to the first straight grooves (701).

4. The expandable logistics PLC cabinet according to claim 3, characterized in that, The elastic connector includes a plug tube (8), one end of which is connected to the second connecting post (4), and the other end is slidably inserted with a plug rod (9). The end of the plug rod (9) away from the plug tube (8) is connected to the limiting plate (7). It also includes a spring (10), which is sleeved on the plug rod (9). One end of the spring (10) abuts against the plug rod (9), and the other end abuts against the inner end of the plug tube (8).

5. An expandable logistics PLC cabinet according to claim 3, characterized in that, The pushing component includes a threaded rod (12), which is rotatably mounted inside the support cylinder (11). A threaded sleeve (14) is threadedly connected to the threaded rod (12), and a collar (15) is provided along the axial direction of the threaded sleeve (14).

6. An expandable logistics PLC cabinet according to claim 5, characterized in that, The two deflection mechanisms are respectively sleeved on the collar (15), and the second connecting post (4) is provided with a guide mechanism to limit the rotation of the two deflection mechanisms.

7. An expandable logistics PLC cabinet according to claim 6, characterized in that, The guiding mechanism includes a guide plate (13), which is arranged in an arc shape and the axis of the guide plate (13) coincides with that of the collar (15). Two first guide grooves (1301) and second guide grooves (1302) with different heights are formed on the guide plate (13).

8. An expandable logistics PLC cabinet according to claim 7, characterized in that, The deflection mechanism includes a connecting hoop (16), which is sleeved on the collar (15), and a guide post (1602) is provided on the outer wall of the connecting hoop (16) and is rotatably connected to the guide plate (13). It also includes a deflection plate (5), one end of which is connected to the connecting hoop (16), and a groove (501) is formed on the other end. A support plate (6) is installed on the limiting plate (7), and a movable column (601) that can be slidably connected to the groove (501) is provided on the support plate (6).

9. An expandable logistics PLC cabinet according to claim 8, characterized in that, The collar (15) has a first threaded groove (1501) and a second threaded groove (1502). The inner walls of the two connecting hoops (16) are movably provided with balls (1601) that slide and adapt to the first threaded groove (1501) or the second threaded groove (1502).

10. A method of using an expandable logistics PLC cabinet as described in any one of claims 1-9, characterized in that, The specific steps include the following: Step 1: Before assembling the cabinet, adjust the assembled telescopic frame according to the required dimensions of the cabinet; Step 2: Start the push component to work. When the push action is performed, the two deflection mechanisms are driven to deflect simultaneously and act on the telescopic locking parts in two directions. After the telescopic locking parts release the limit on the first connecting post (3), the first connecting post (3) can move freely relative to the second connecting post (4). Step 3: When adjusting the telescopic length and width on the telescopic frame, they do not interfere with each other and do not affect the subsequent telescopic locking components locking the telescopic columns in both directions simultaneously.

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