Multifunctional USB KEY assembling and testing machine

Abstract

An emergency stop switch, a start button, a stop button and a single-step motion button are arranged on a shell, a feeding unit, a USB plug press-fitting unit, a USB plug fixing unit and a USB data sintering and testing unit are sequentially installed in the shell from left to right, and the four units are fixedly connected and all connected with an execution function gear motor. A parallel moving unit is arranged on the lower side of the four units, an NG unit is arranged on the right side of the four units, an upper cover is arranged on the upper side of the four units, the parallel moving unit is connected with a moving function gear motor, a qualified product part box and a defective product part box are placed in a discharging port in the right side of the shell, a PLC is placed in the shell, and the upper cover is connected with the shell. The machining continuity is guaranteed, and the efficiency is improved; the position accuracy is ensured; the precision of the fixed size is ensured; the whole process of sintering and testing is completed in one step and is efficient and rapid; and the motion trail of the clamping jaw is circularly moved in a rectangular path, which is efficient and stable.

Description

Technical Field

[0001] This invention relates to the field of testing equipment technology, and in particular to a USB KEY multi-functional assembly and testing machine. Background Technology

[0002] Current USB key products use manual presses to install the metal plugs, which is not only slow but also prone to problems such as incomplete installation, misalignment, and product damage due to manual pressing. Furthermore, the subsequent programming and testing of the USB key also relies on manual clicking of the software, a cumbersome and inefficient process prone to human error. Summary of the Invention

[0003] To solve the above problems, the present invention provides a USB KEY multi-functional assembly and testing machine.

[0004] To solve the above technical problems, the technical solution of the present invention is: a USB KEY multi-functional assembly and testing machine, including a shell, an emergency stop switch, a start button, a stop button, and a single-step motion button on the shell. Inside the shell, from left to right, are installed a feeding unit, a USB plug pressing unit, a USB plug fixing unit, and a USB data sintering and testing unit. The above four units are fixedly connected and are all connected to the execution function reduction motor. There is a parallel movement unit on the lower side of the above four units, an NG unit on the right side, and a top cover on the upper side. The parallel movement unit is connected to the movement function reduction motor. The discharge port on the right side of the shell holds a qualified parts box and a defective parts box. A PLC is placed inside the shell, and the top cover is connected to the shell.

[0005] Furthermore, the feeding unit includes an automatic feeding clamp mounted on a fixed frame. 20 USB keys are pressed down inside the automatic feeding clamp by spring A. The automatic feeding clamp is inserted into the feeding clamp seat and fixed by a spring plate. The fixed frame is equipped with a USB tail end fixing seat and a USB front end fixing seat.

[0006] Furthermore, the USB plug pressing unit includes a movable block that is slidably connected to a linear guide rail. The movable block is directly opposite the USB tail end fixing seat and the USB front end fixing seat. The movable block has a pressing head on the side near the USB front end fixing seat and a cam bearing on the other tail end. The cam bearing cooperates with cam A. Cam A is driven by an actuation function reduction motor. A tension spring B is fixed on the side of the movable block.

[0007] Furthermore, the USB connector fixing unit includes a swinging pressure rod connected to the base plate via a hinge in the middle. The swinging pressure rod is directly opposite the USB tail end fixing seat and the USB front end fixing seat. The rear side cooperates with cam B via a cam bearing. Cam B is driven by an actuation function reduction motor. The rear end of the swinging pressure rod is connected to the base plate via a tension spring B. The other front end of the swinging pressure rod is connected to a stop pressure plate. An upper pressure block is fixed on the front end face. A lower pressure block is fixed on the base plate directly below the USB KEY.

[0008] Furthermore, the USB data sintering and testing unit includes a USB socket fixing block fixed on a linear guide rail. The USB socket fixing block is directly opposite the USB tail fixing seat and the USB front fixing seat. A cam bearing is fixed to the rear side of the USB socket fixing block. This cam bearing mates with the front side of cam C. A cam crank arm is fixed above the USB socket fixing block. A cam bearing is fixed to the rear side of the cam crank arm. This cam bearing mates with the rear side of cam C. The cam bearing and cam C are driven by an actuating function reduction motor. A sensor light shield is located at the front end of the drive shaft connected to cam C. There is a photoelectric sensor on each side of the light shield. The photosensitive sensor is located directly above the USB lamp. The feeding extension plate is located at the feeding port on the right side of the outer shell.

[0009] Furthermore, the NG unit includes a guide groove mounted on the moving end flange surface of the pneumatic slide table, and the fixed end of the pneumatic slide table is connected to the base plate.

[0010] Furthermore, the parallel moving unit includes a horizontally moving vertical plate. The lower end of the horizontally moving vertical plate is connected to a fixed vertical plate at the rear via three sets of linear guide rails B. The upper end of the horizontally moving vertical plate is connected to a vertically moving vertical plate at the rear via two additional sets of linear guide rails B. The two sides of the horizontally moving vertical plate are connected to the vertically moving vertical plate via tension springs B. Two guide wheels are fixed in the middle of the horizontally moving vertical plate via guide wheel fixing plates. The guide wheels cooperate with cams D. Two cam track plates in the middle of the horizontally moving vertical plate cooperate with cam bearings on the cam swing arm. The cam swing arm and cam D are sequentially mounted on the cam drive shaft. The device is connected to a moving function geared motor via a coupling. The moving function geared motor is fixed on a motor mounting block. A fixed vertical plate is fixed to the front end of the motor mounting block. A cam bearing below the vertical moving plate engages with a horizontal guide block. The cam bearing behind the horizontal guide block engages with cam D. A cylinder is fixed to the right side of the gripper cylinder mounting block. The cylinder's output shaft is connected to a parallel drive shaft via a shaft connecting block. The parallel drive shaft passes through the gripper cylinder mounting block from left to right, and sequentially passes through the moving gripper B, adjusting spring, positioning sleeve, fixed gripper B, moving gripper B, adjusting spring, positioning sleeve, fixed gripper B, moving gripper B, adjusting spring, positioning sleeve, fixed gripper A, moving gripper A, adjusting spring, and positioning sleeve. The positioning sleeve is fixed to the parallel drive shaft.

[0011] Furthermore, the top cover is transparent and can be opened and closed.

[0012] The beneficial effects of this invention are: 1. The feeding unit, using a clamping method, can fill and process multiple USBs at once, ensuring processing continuity and improving efficiency; 2. USB plug pressing unit: The adjustable pressing head at the front of the device presses the USB plug into the designated position, ensuring positioning accuracy. 3. The USB plug fixing unit uses an adjustable toothed pressure head to fold the sheet metal fixing piece of the metal head into the groove of the plastic part to fix it and ensure the accuracy of the fixing size. 4. USB data sintering and testing unit: The entire sintering and testing process is completed in one step, which is efficient and fast. 5. The NG unit slides the defective products into the defective product box through the guide groove; 6. The parallel moving unit has four grippers linked by a cylinder. To ensure the gripper engagement effect, there are springs at the moving grippers to compensate for clamping errors. The motor drives the cam group for control, so that the movement trajectory of the grippers is a rectangular cyclical motion, which is efficient and stable. Attached Figure Description Figure 1 This is a top view of the present invention; Figure 2 This is a front view of the present invention; Figure 3 This is a front view of the feeding unit; Figure 4 yes Figure 3 AA section diagram; Figure 5 This is a top view of the feeding unit; Figure 6 This is a front view of the USB plug press-fit unit; Figure 7 yes Figure 6 AA section diagram; Figure 8 This is a top view of the USB plug press-fit unit; Figure 9 This is a front view of the USB plug fixing unit; Figure 10 yes Figure 9 CC section view; Figure 11 This is a top view of the USB plug fixing unit; Figure 12 This is a front view of the USB data burning and testing unit; Figure 13 yes Figure 12 AA section diagram; Figure 14 This is a top view of the USB data burning and testing unit; Figure 15 This is the front view of the NG unit; Figure 16 This is a front view of the parallel movement unit; Figure 17 This is the right view of the parallel movement unit.

[0013] The components include: 1. Emergency stop switch; 2. Start button; 3. Stop button; 4. Single-step motion button; 5. Loading unit; 6. USB plug pressing unit; 7. USB plug fixing unit; 8. USB data sintering and testing unit; 9. Qualified parts box; 10. Defective parts box; 11. NG unit; 12. Moving function geared motor; 13. Housing; 14. Actuating function geared motor; 15. PLC; 16. Top cover; 17. Parallel moving unit; 18. USB tail end fixing base; 19. Automatic loading clamp; 20. Spring sheet; 21. Loading clamp base; 22. USB KEY, 23. USB front-end mounting bracket, 24. Spring A, 25. Mounting bracket, 26. Press-fitting head, 27. Linear guide rail, 28. Moving block, 29. Cam A, 30. Cam bearing, 31. Spring B, 32. Stop plate, 33. Swinging rod, 34. Cam B, 35. Base plate, 36. Upper pressing block, 37. Lower pressing block, 38. Photosensitive sensor, 39. USB socket mounting block, 40. Cam crank arm, 41. Cam C, 42. Unloading extension plate, 43. Photoelectric sensor, 44. Drive shaft, 45. Sensor light shield, 46. Guide groove, 47. Pneumatic 48. Slide table, 49. Linear guide rail B, 50. Fixed vertical plate, 51. Horizontal moving vertical plate, 52. Guide wheel fixing plate, 53. Guide wheel, 54. Cam swing arm, 55. Cam track plate, 56. Vertical moving vertical plate, 57. Moving gripper A, 58. Fixed gripper A, 59. Moving gripper B, 60. Fixed gripper B, 61. Parallel moving shaft, 62. Positioning bushing, 63. Adjusting spring, 64. Gripper cylinder fixing block, 65. Shaft connecting block, 66. Cylinder, 67. Horizontal guide block, 68. Cam D, 69. Motor fixing block, 70. Cam drive shaft, 71. Coupling. Detailed Implementation

[0014] The following is in conjunction with the appendix Figure 1-17 The technical solutions of the present invention have been clearly and completely described. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] The USB KEY multi-functional assembly and testing machine includes a housing 13. The housing 13 has an emergency stop switch 1, a start button 2, a stop button 3, and a single-step motion button 4. Inside the housing 13, from left to right, are installed a feeding unit 5, a USB plug pressing unit 6, a USB plug fixing unit 7, and a USB data sintering and testing unit 8. The above four units are fixedly connected and are all connected to the execution function reduction motor 14. There is a parallel movement unit 17 on the lower side of the above four units, an NG unit 11 on the right side, and a top cover 16 on the upper side. The parallel movement unit 17 is connected to the movement function reduction motor 12. The discharge port on the right side of the housing 13 holds a qualified parts box 9 and a defective parts box 10. A PLC 15 is placed inside the housing 13. The top cover 16 is connected to the housing 13 and is transparent and can be opened and closed.

[0016] The feeding unit 5 includes an automatic feeding clamp 19 mounted on a fixed frame 25. Twenty USB keys 22 are pressed down inside the automatic feeding clamp 19 by a spring A24. The automatic feeding clamp 19 is inserted into the feeding clamp seat 21 and fixed by a spring plate 20. The fixed frame 25 is equipped with a USB tail end fixing seat 18 and a USB front end fixing seat 23.

[0017] The USB plug pressing unit 6 includes a movable block 28 that is slidably connected to the linear guide rail 27. The movable block 28 is directly opposite the USB tail end fixing seat 18 and the USB front end fixing seat 23. The movable block 28 has a pressing head 26 on the side near the USB front end fixing seat 23, and a cam bearing 30 on the other tail end. The cam bearing 30 cooperates with the cam A29. The cam A29 is driven by the function reduction motor 14. A tension spring B31 is fixed on the side of the movable block 28.

[0018] The USB connector fixing unit 7 includes a swinging rod 33 connected to the base plate 5 via a hinge in the middle. The swinging rod 33 is directly opposite the USB tail fixing seat 18 and the USB front fixing seat 23. The rear side is engaged with the cam B34 via the cam bearing 30. The cam B34 is driven by the function reduction motor 14. The rear end of the swinging rod 33 is connected to the base plate 35 via the tension spring B31. The other front end of the swinging rod 33 is connected to the stop plate 32. An upper pressure block 36 is fixed on the front end face. A lower pressure block 37 is fixed on the base plate 35 directly below the USB KEY.

[0019] The USB data sintering and testing unit 8 includes a USB socket fixing block 39 fixed on a linear guide rail 27. The USB socket fixing block 39 is directly opposite the USB tail fixing seat 18 and the USB front fixing seat 23. A cam bearing 30 is fixed on the rear side of the USB socket fixing block 39. This cam bearing 30 cooperates with the front side of the cam C 41. A cam crank arm 40 is fixed on the top of the USB socket fixing block 39. The cam bearing 30 is fixed on the rear side of the cam crank arm 40. This cam bearing 30 cooperates with the rear side of the cam C 41. The cam bearing 30 and the cam C 41 are driven by the function reduction motor 14. The front end of the drive shaft 44 connected to the cam C 41 has a sensor light shield 45. There is a photoelectric sensor 43 on each side of the light shield. The photosensitive sensor 38 is located directly above the USB lamp. The feeding extension plate 42 is located at the feeding port on the right side of the outer casing 13.

[0020] The NG unit 11 includes a guide groove 46 mounted on the moving end flange surface of the pneumatic slide table 47, and the fixed end of the pneumatic slide table 47 is connected to the base plate 35.

[0021] The parallel moving unit 17 includes a horizontally moving vertical plate 50. The lower end of the horizontally moving vertical plate 50 is connected to the fixed vertical plate 49 on the rear side via three sets of linear guide rails B48. The upper end of the horizontally moving vertical plate 50 is connected to the vertically moving vertical plate 55 on the rear side via two other sets of linear guide rails B48. The two sides of the horizontally moving vertical plate 50 are connected to the vertically moving vertical plate 55 via tension springs B31. Two guide wheels 52 are fixed in the middle of the horizontally moving vertical plate 50 via guide wheel fixing plates 51. The guide wheels 52 cooperate with cams D67. There are two cam track plates 54 in the middle of the horizontally moving vertical plate 50, which cooperate with cam bearings 30 on the cam swing arms 53. The cam swing arms 53 and cams D67 are sequentially mounted on the cam drive shaft 69 and connected by a coupling. 70 is connected to the moving function geared motor 12, which is fixed on the motor fixing block 68. The fixing plate 49 is fixed to the front end of the motor fixing block 68. The cam bearing 30 below the vertical moving plate 55 cooperates with the transverse guide block 66. The cam bearing 30 behind the transverse guide block 66 cooperates with the cam D67. The cylinder 65 is fixed to the right side of the gripper cylinder fixing block 63. The output shaft of the cylinder 65 is connected to the parallel transmission shaft 60 through the shaft connecting block 64. The parallel transmission shaft 60 passes through the gripper cylinder fixing block 63 from left to right, and then passes through the moving gripper B58, adjusting spring 62, positioning bushing 61, fixed gripper B59, moving gripper B58, adjusting spring 62, positioning bushing 61, and fixed gripper B59 in sequence. 59. Moving gripper B; 58. Adjusting spring 62; Positioning sleeve 61; Fixed gripper A; 57. Moving gripper A; 56. Adjusting spring 62; Positioning sleeve 61, wherein the positioning sleeve 61 is fixed to the parallel transmission shaft 60.

[0022] The working process is as follows: The pre-installed USB KEY22 (the plug is not fully pressed into the USB housing at this time) is placed into the automatic feeding clamp 19, which can hold 20 USB KEY22s. Then the automatic feeding clamp 19 is placed on the clamping seat 21. The spring plate 20 will clamp it with its elasticity. The operator clicks the start button 2 on the outer shell 13, and the equipment starts to run. The moving function reduction motor 12 of the parallel moving unit 17 runs, first driving the horizontal moving plate 50 to move to the left, and then driving the vertical moving plate 55 to move upward. The first gripper on its right side (shaft connecting block 64 and moving gripper B 58) grabs the USB KEY22 at the lower end of the automatic feeding clamp 19 through the action of the cylinder 65 and places it into the USB positioning slot of the next station (i.e., the USB plug pressing unit 6). The positioning slot is composed of the USB tail fixing seat 18 and the USB front fixing seat 23.

[0023] The USB plug pressing unit 6 drives the cam A 29 to rotate via the function reduction motor 14, which pushes the moving block 28. The pressing head 26 at the front end of the moving block 28 pushes the plug of the USB KEY 22 to the bottom of the USB plastic shell plug position. The cam A 29 continues to rotate, and under the action of the tension spring A 24, the moving block 28 moves away from the USB KEY 22. The second gripper (fixed gripper B 59 and moving gripper B 58) of the parallel moving unit 17 moves the USB KEY 22 to the next station and places it in the positioning slot.

[0024] The USB plug fixing unit 7 drives the cam B34 to rotate via the function reduction motor 14, which in turn pushes the swing pressure rod 33. The stop plate 32 above the front end of the swing pressure rod 33 first presses down on the upper surface of the USB KEY22 to ensure its fixed state. The cam B34 continues to rotate, pushing the swing pressure rod 33 to press the upper pressure block 36 down onto the buckle of the USB KEY22 plug. Below the plug is the lower pressure block 37, which also contacts the buckle of the USB KEY22 plug. Under the action of the upper pressure block 36 and the lower pressure block 37, the buckle of the USB KEY22 plug will fold down into the recess where the outer shell contacts the plug, thus fixing it. The cam B34 continues to rotate, the upper stop plate 32 rises, and the swing pressure rod 33 moves away from the USB plug. The third gripper (fixed gripper B59 and moving gripper B58) of the parallel moving unit 17 moves the USB KEY22 to the next station and places it in the positioning slot.

[0025] The USB data burning and testing unit 8 drives the cam B34 to rotate via the function reduction motor 14, which pushes the USB socket fixing block 39. The USB KEY22 plug is inserted into the USB socket in the USB socket fixing block 39. The photosensitive sensor 38 on the stop plate 32 recognizes the indicator light of the USB KEY22. If it lights up, the next step continues. The software will automatically burn the KEY data directly into the USB KEY22 and perform the test. After the software test is completed, the cam C41 continues to rotate, pushing the cam crank arm 40 to pull the USB socket fixing block 39 back. The USB KEY22 is moved to the exit of the equipment by the fourth gripper (fixed gripper A57 and moving gripper A56) of the parallel moving unit 17 and guided into the qualified parts box 9.

[0026] Products that do not emit light or fail to be sintered are considered defective. The NG unit 11 will extend a guide plate to intercept them at the exit and guide the defective products into the defective parts box 10.

[0027] It takes 9 seconds to complete one USB key product, and 3200 products can be completed in 8 hours, requiring one operator. Currently, two people work together to complete 1200 products in 8 hours.

[0028] The embodiments described above are merely preferred embodiments of the present invention, and not all feasible embodiments of the present invention. Any obvious modifications made by those skilled in the art without departing from the principles and spirit of the present invention should be considered to be included within the scope of protection of the claims of the present invention.

Claims

1. A USB KEY multi-functional assembly and testing machine, characterized in that, Includes a housing (13), on which are an emergency stop switch (1), a start button (2), a stop button (3), and a single-step motion button (4). Inside the housing (13), from left to right, are installed a feeding unit (5), a USB plug pressing unit (6), a USB plug fixing unit (7), and a USB data sintering and testing unit (8). The above four units are fixedly connected and are all connected to the function reduction motor (14). The lower side of the above four units is a parallel movement unit (17), the right side is an NG unit (11), and the upper side is a cover (16). The parallel movement unit (17) is connected to the movement function reduction motor (12). The discharge port on the right side of the housing (13) holds a qualified parts box (9) and a defective parts box (10). Inside the housing (13), there is a PLC (15), and the cover (16) is connected to the housing (13).

2. The USB KEY multi-functional assembly and testing machine according to claim 1, characterized in that, The feeding unit (5) includes an automatic feeding clamp (19) installed on a fixed frame (25). 20 USB keys (22) are pressed down inside the automatic feeding clamp (19) by a spring A (24). The automatic feeding clamp (19) is inserted into the feeding clamp seat (21) and fixed by a spring sheet (20). The fixed frame (25) is equipped with a USB tail end fixing seat (18) and a USB front end fixing seat (23).

3. The USB KEY multi-functional assembly and testing machine according to claim 1, characterized in that, The USB plug pressing unit (6) includes a movable block (28) slidably connected to a linear guide rail (27). The movable block (28) is directly opposite the USB tail end fixing seat (18) and the USB front end fixing seat (23). The movable block (28) has a pressing head (26) on the side near the USB front end fixing seat (23) and a cam bearing (30) on the other tail end. The cam bearing (30) cooperates with cam A (29). Cam A (29) is driven by an actuation function reduction motor (14). A tension spring B (31) is fixed on the side of the movable block (28).

4. The USB KEY multi-functional assembly and testing machine according to claim 1, characterized in that, The USB connector fixing unit (7) includes a swinging pressure rod (33) connected to the base plate (5) by a hinge in the middle. The swinging pressure rod (33) is directly opposite the USB tail end fixing seat (18) and the USB front end fixing seat (23). The rear side is connected to the cam B (34) through the cam bearing (30). The cam B (34) is driven by the function reduction motor (14). The rear end of the swinging pressure rod (33) is connected to the base plate (35) through the tension spring B (31). The other front end of the swinging pressure rod (33) is connected to the stop pressure plate (32). The front end is fixed with an upper pressure block (36). The bottom plate (35) directly below the USBKEY is fixed with a lower pressure block (37).

5. The USB KEY multi-functional assembly and testing machine according to claim 1, characterized in that, The USB data sintering and testing unit (8) includes a USB socket fixing block (39) fixed on a linear guide rail (27). The USB socket fixing block (39) is directly opposite the USB tail fixing seat (18) and the USB front fixing seat (23). A cam bearing (30) is fixed on the rear side of the USB socket fixing block (39). This cam bearing (30) cooperates with the front side of the cam C (41). A cam crank arm (40) is fixed above the USB socket fixing block (39). A cam bearing (30) is fixed on the rear side of the cam crank arm (40). This cam bearing (30) cooperates with the rear side of the cam C (41). The cam bearing (30) and the cam C (41) are driven by an actuating function reduction motor (14). A sensor light shield (45) is located at the front end of the transmission shaft (44) connecting the cam C (41). There is a photoelectric sensor (43) on each side of the light shield. The photosensitive sensor (38) is located directly above the USB lamp. The feeding extension plate (42) is located at the feeding port on the right side of the outer shell (13).

6. The USB KEY multi-functional assembly and testing machine according to claim 1, characterized in that, The NG unit (11) includes a guide groove (46) installed on the moving end flange surface of the pneumatic slide (47), and the fixed end of the pneumatic slide (47) is connected to the base plate (35).

7. The USB KEY multi-functional assembly and testing machine according to claim 1, characterized in that, The parallel moving unit (17) includes a horizontally moving plate (50). The lower end of the horizontally moving plate (50) is connected to the fixed plate (49) on the rear side via three sets of linear guide rails B (48). The upper end of the horizontally moving plate (50) is connected to the vertically moving plate (55) on the rear side via two other sets of linear guide rails B (48). The two sides of the horizontally moving plate (50) are connected to the vertically moving plate (55) via tension springs B (31). The middle position of the horizontally moving plate (50) is fixed by a guide wheel. (51) Fixed guide wheels (52), two sets in total. The guide wheels (52) cooperate with the cam D (67). There are two cam track plates (54) in the middle of the horizontally moving vertical plate (50) and they cooperate with the cam bearings (30) on the cam swing arm (53). The cam swing arm (53) and cam D (67) are installed on the cam drive shaft (69) in sequence and connected to the moving function geared motor (12) through the coupling (70). The moving function geared motor (12) is fixed on the motor fixing block (68). Plate (49) is fixed at the front end of motor fixing block (68). The cam bearing (30) below the vertically moving plate (55) cooperates with the transverse guide block (66). The cam bearing (30) behind the transverse guide block (66) cooperates with the cam D (67). Cylinder (65) is fixed on the right side of gripper cylinder fixing block (63). The output shaft of cylinder (65) is connected to parallel transmission shaft (60) through shaft connecting block (64). Parallel transmission shaft (60) passes through gripper cylinder fixing block (63) from left to right. And pass through the movable gripper B (58), adjusting spring (62), positioning bushing (61), fixed gripper B (59), movable gripper B (58), adjusting spring (62), positioning bushing (61), fixed gripper B (59), movable gripper B (58), adjusting spring (62), positioning bushing (61), fixed gripper A (57), movable gripper A (56), adjusting spring (62), positioning bushing (61) in sequence, wherein the positioning bushing (61) is fixed to the parallel drive shaft (60).

8. The USB KEY multi-functional assembly and testing machine according to claim 1, characterized in that, The top cover (16) is transparent and can be opened and closed.

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