A cable breakout protection box for optical communications

Abstract

The application discloses a cable tapping protection box for optical communication, which comprises a box body, a rotating shaft arranged on the box body in a rotating mode, a box door arranged outside the rotating shaft and synchronous with the rotating shaft, a working cavity arranged in the box body, mounting cavities arranged on the top and bottom of the working cavity, and a blowing mechanism arranged in the mounting cavities. The blowing mechanism can ensure that the temperature in the box body is appropriate, and the optical cable and other equipment are always in the best working state. The transmission mechanism and the driven part are arranged, so that the pipe opening of the movable pipe faces the box body when the box door is closed, and the opening of the movable pipe is enlarged by the rotation of the movable plate, thereby facilitating the blowing of the box body. When the box door is opened, the movable pipe faces outward slightly and the pipe opening is small, so that the air curtain is formed at the box door to prevent the cold air outside from entering, and the cold and hot air is prevented from converging in the box body and forming water drops on the surface of the cable.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical communication, in particular to a cable tapping protection box for optical communication. BACKGROUND

[0002] Optical communication is a communication mode with optical wave as carrier, and optical fiber cable is widely used in the field of life today. Optical fiber communication technology has been popularized in many residential areas. Fiber to the home (FTTH) is a new measure adopted by the development of optical fiber communication technology and the improvement of user demand. It needs to use many optical fiber distribution equipment and components. After fiber to the home, the home broadband access capacity can exceed 100 megabits per second, and the application effect is very obvious.

[0003] Connecting outdoor optical cable to each resident's home in residential area needs a series of optical fiber distribution and connection, which requires the use of tapping box. In some cold areas, the tapping box generally has a heating mechanism to keep the temperature in the tapping box within a certain range to keep the optical cable and some equipment in the tapping box in the best state. However, the tapping box needs to be maintained regularly. When the door of the tapping box is opened, the cold air from outside enters the box, causing water droplets on the surface of the optical cable and the inner wall of the box. If not handled, the water droplets will remain on the surface of the optical cable and the box, making the tapping box humid and accelerating the aging speed of the cable skin. Therefore, we propose a cable tapping protection box for optical communication. SUMMARY

[0004] The purpose of the present application is to provide a cable tapping protection box for optical communication to solve the problems raised in the background.

[0005] To achieve the above purpose, the present application provides the following technical scheme: a cable tapping protection box for optical communication, comprising a box body, a rotating shaft rotatably arranged on the box body, a box door arranged outside the rotating shaft, the box door being synchronous with the rotating shaft, a working cavity arranged in the box body, an installation cavity arranged at the top and bottom of the working cavity, a blowing mechanism arranged in the installation cavity, a temperature sensor arranged on the side wall of the box body, an air inlet formed on the two sides of the box body, a closing piece one arranged in the installation cavity to close the air inlet, an air outlet formed on one side of the box body, and a closing piece two arranged on the inner wall of the box body to close the air outlet.

[0006] A transmission mechanism is arranged in the installation cavity, the transmission mechanism being in transmission connection with the box door and the blowing mechanism, the blowing angle of the blowing mechanism being changed by the transmission mechanism when the box door rotates, a driven part being arranged on the blowing mechanism, and the size of the blowing port of the blowing mechanism being adjusted by the driven part when the blowing angle of the blowing mechanism changes.

[0007] Preferably, the air supply mechanism comprises an air inlet pipe provided at the air inlet, an electric heating wire is arranged in the air inlet pipe, a blower is arranged in the mounting cavity, a cross pipe is connected at the air outlet of the blower, a hose is arranged at the end of the cross pipe, a movable pipe is arranged at the end of the hose, damping shafts are arranged at both sides of the movable pipe, and the movable pipe is rotatably arranged in the box through the damping shafts.

[0008] Preferably, the hose is a bellows.

[0009] Preferably, the closing part one comprises a driving motor arranged on the inner wall of the box, a screw rod is arranged at the output end of the driving motor, a bearing seat is arranged on the inner wall of the box, and the screw rod is rotatably arranged on the bearing seat through the bearing;

[0010] A guide rail is arranged on the inner wall of the box, a closing plate one is movably arranged in the guide rail, the closing plate one is threadedly sleeved on the screw rod, and a side slot is formed in the air inlet pipe, and the driving motor drives the closing plate one to close the air inlet pipe when the driving motor is started.

[0011] Preferably, a sliding groove is formed at the air outlet of the inner wall of the box, the closing part two comprises a closing plate two movably arranged in the sliding groove, an electric push rod is arranged in the sliding groove, a connecting block is arranged at the end of the electric push rod, and the connecting block is fixedly connected with the closing plate two.

[0012] Preferably, the transmission mechanism comprises a transmission sprocket arranged outside the rotating shaft, a synchronous shaft is rotatably arranged in the mounting cavity, a synchronous sprocket is arranged outside the synchronous shaft, a synchronous chain is arranged outside the synchronous sprocket, the transmission sprocket and the synchronous sprocket are synchronously rotated through the synchronous chain when the box door is rotated, a half-tooth bevel gear is further arranged outside the synchronous shaft, and a transmission bevel gear meshing with the half-tooth bevel gear is arranged outside the damping shaft.

[0013] Preferably, the driven part comprises a driven shaft rotatably arranged in the movable pipe, the driven shaft is rotatably arranged at one end of the movable pipe, an activity plate is arranged in the movable pipe, the activity plate is arranged outside the driven shaft and synchronously rotates with the driven shaft, a driven sprocket one is arranged outside the driven shaft, a driven sprocket two is arranged outside the damping shaft, a driven chain is arranged outside the driven sprocket one and the driven sprocket two, the driven sprocket one and the driven sprocket two are synchronously rotated through the driven chain, the damping shaft is rotated when the movable pipe is rotated, and the damping shaft drives the driven shaft to rotate through the driven sprocket one and the driven sprocket two.

[0014] Preferably, the inner wall of the box is provided with a mounting block, the temperature sensor is movably inserted into the mounting block, a clamping groove is formed in the base of the temperature sensor, a displacement slot is formed in the mounting block, a clamping block is arranged in the displacement slot, a positioning rod is arranged on the clamping block, the positioning rod movably penetrates through the mounting block and is provided with a handle at the end, a reset spring is arranged in the displacement slot, and the two ends of the reset spring are fixedly connected with the clamping block and the bottom of the displacement slot respectively.

[0015] Compared with the prior art, the present application has the following advantages:

[0016] 1、The air supply mechanism is arranged, so that the temperature in the box can be ensured to be appropriate, and the optical cable and other equipment can always be in the best working state; the transmission mechanism and the driven part are arranged, so that when the box door is closed, the pipe opening of the movable pipe faces the box, and at the same time, the rotation of the movable plate makes the opening of the movable pipe larger, so that the air supply to the box can be facilitated; when the box door is opened, the movable pipe faces slightly outward and the pipe opening is smaller, so that a wind curtain is formed at the box door to block the cold air outside from entering, and cold and hot air is prevented from converging in the box and forming water droplets on the surface of the cable.

[0017] 2、The closing part one and the closing part two are arranged, so that the box can be effectively isolated from the outside and the normal use of the air supply mechanism is not affected; the temperature sensor is arranged as a convenient dismounting mechanism, so that it can be quickly dismounted during maintenance, and the work efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0019] Figure 2 It is a schematic diagram of the overall structure of the present application; Figure 1

[0020] Figure 3 It is a schematic diagram of the overall structure of the present application; Figure 2

[0021] Figure 4 It is a schematic diagram of the overall structure of the present application; Figure 2

[0022] Figure 5 It is a schematic diagram of the air supply mechanism structure of the present application;

[0023] Figure 6 It is a schematic diagram of the overall structure of the present application;

[0024] Figure 7 It is a schematic diagram of the temperature sensor installation structure of the present application.

[0025] ​​​In the figure: 1-box; 2-working chamber; 3-mounting cavity; 4-blower mechanism; 41-air inlet pipe; 42-electric heating wire; 43-blower; 44-cross pipe; 45-hose; 46-movable pipe; 47-damping shaft; 5-temperature sensor; 51-mounting block; 52-clamping groove; 53-shifting groove; 54-clamping block; 55-positioning rod; 56-grip; 57-return spring; 6-closing part one; 61-driving motor; 62-screw rod; 63-bearing seat; 64-guide rail; 65-closing plate one; 66-side groove; 7-closing part two; 71-sliding groove; 72-closing plate two; 73-electric push rod; 74-connecting block; 8-transmission mechanism; 81-transmission sprocket; 82-synchronous shaft; 83-synchronous sprocket; 84-synchronous chain; 85-semi-tooth bevel gear; 86-transmission bevel gear; 9-follower; 91-follower shaft; 92-movable plate; 93-follower sprocket one; 94-follower sprocket two; 95-follower chain; 10-rotating shaft; 11-box door; 12-air inlet; 13-air outlet. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0027] Please refer to Figures 1-7 The present application provides a technical solution: a cable tapping protection box for optical communication, comprising a box 1, a rotating shaft 10 is rotatably arranged on the box 1, a box door 11 is arranged on the outer side of the rotating shaft 10, the box door 11 rotates synchronously with the rotating shaft 10, a working chamber 2 is arranged in the box 1, mounting cavities 3 are arranged at the top and bottom of the working chamber 2, a blower mechanism 4 is arranged in the mounting cavities 3, a temperature sensor 5 is arranged on the side wall of the box 1, air inlets 12 are formed on both sides of the box 1, closing parts one 6 are arranged in the mounting cavities 3 to close the air inlets 12, an air outlet 13 is also formed on one side of the box 1, and closing parts two 7 are arranged on the inner wall of the box 1 to close the air outlet 13;

[0028] The installation cavity 3 is provided with a transmission mechanism 8, the transmission mechanism 8 is in transmission connection with the cabinet door 11 and the air supply mechanism 4, the cabinet door 11 changes the air supply angle of the air supply mechanism 4 through the transmission mechanism 8 when rotating, the air supply mechanism 4 is provided with a driven part 9, when the air supply angle of the air supply mechanism 4 changes, the driven part 9 drives the air supply opening of the air supply mechanism 4 to adjust the size, through the setting of the air supply mechanism 4, the temperature in the cabinet 1 can be ensured to be appropriate, the optical cable and other equipment can be ensured to be in the best working state all the time, and through the setting of the transmission mechanism 8 and the driven part 9, the pipe opening of the movable pipe 46 can be directed to the inside of the cabinet 1 when the cabinet door 11 is closed, and at the same time, the movable plate 92 rotates to make the opening of the movable pipe 46 larger, so that the inside of the cabinet 1 can be conveniently air supplied, and when the cabinet door 11 is opened, the direction of the movable pipe 46 is slightly outward and the pipe opening is smaller, so that the air curtain at the cabinet door 11 can block the cold air outside from entering, and the cold and hot air is prevented from converging in the cabinet 1 and forming water drops on the surface of the cable.

[0029] The air supply mechanism 4 comprises an air inlet pipe 41 arranged at the air inlet 12, the air inlet pipe 41 is provided with an electric heating wire 42, the installation cavity 3 is provided with a blower 43, the air outlet of the blower 43 is connected with a horizontal pipe 44, the end of the horizontal pipe 44 is provided with a hose 45, the end of the hose 45 is provided with a movable pipe 46, the movable pipe 46 is directed to the inside of the cabinet 1 when the cabinet door 11 is closed, and is slightly directed to the outside of the cabinet 1 when the cabinet door 11 is opened, the movable pipe 46 is provided with a damping shaft 47 on both sides, the damping shaft 47 is fixedly connected with the movable pipe 46, and the movable pipe 46 is rotatably arranged in the cabinet 1 through the damping shaft 47, when the temperature in the cabinet 1 decreases, the blower 43 is started at this time, the outside air is drawn into the cabinet 1, and the outside air is changed into hot air under the heating action of the electric heating wire 42, so that the temperature in the cabinet 1 is changed.

[0030] The hose 45 is a corrugated pipe, which can not be damaged under multiple bending and prolong the service life.

[0031] The closing part one 6 comprises a driving motor 61 arranged on the inner wall of the cabinet 1, the driving motor 61 is provided with a lead screw 62 at the output end, the inner wall of the cabinet 1 is provided with a bearing seat 63, and the lead screw 62 is rotatably arranged on the bearing seat 63 through the bearing;

[0032] The inner wall of the cabinet 1 is provided with a guide rail 64, the closing plate one 65 is movably arranged in the guide rail 64, the closing plate one 65 is threadedly sleeved on the lead screw 62, and the air inlet pipe 41 is provided with a side slot 66, when the driving motor 61 is started, the closing plate one 65 is driven by the lead screw 62 to close the air inlet pipe 41, when the temperature sensor 5 detects that the temperature decreases, first, the driving motor 61 is started to drive the lead screw 62 to rotate, the lead screw 62 drives the closing plate one 65 to move on the guide rail 64 and then to move away from the air inlet pipe 41, at this time, the air inlet 12 is communicated with the outside, then the electric heating wire 42 and the air supply mechanism 4 start to work.

[0033] A groove 71 is provided at the air outlet 13 on the inner wall of the housing 1. The sealing component 2 7 includes a sealing plate 2 72 movably disposed in the groove 71. An electric push rod 73 is provided in the groove 71. A connecting block 74 is provided at the end of the electric push rod 73. The connecting block 74 is fixedly connected to the sealing plate 2 72. When the air supply mechanism 4 is started, the electric push rod 73 retracts and drives the sealing plate 2 72 away from the air outlet 13. At this time, the cold air in the housing 1 will be discharged from the air outlet 13. After the temperature adjustment is completed, the electric push rod 73 restarts and drives the sealing plate 2 72 to close the air outlet 13.

[0034] The transmission mechanism 8 includes a transmission sprocket 81 disposed outside the rotating shaft 10. A synchronous shaft 82 is rotatably disposed inside the mounting cavity 3. A synchronous sprocket 83 is disposed outside the synchronous shaft 82, and a synchronous chain 84 is disposed outside the synchronous sprocket 83. When the door 11 rotates, the synchronous chain 84 drives the transmission sprocket 81 and the synchronous sprocket 83 to rotate synchronously. A half-tooth bevel gear 85 is also disposed outside the synchronous shaft 82, and a transmission bevel gear 86 meshing with the half-tooth bevel gear 85 is disposed outside the damping shaft 47. When the door 11 changes from the open state to the closed state as shown in the figure, the door 11 drives the rotating shaft 10 to rotate, and the rotating shaft 10 drives the transmission sprocket 81. 1. When the door 11 rotates, under the action of the synchronous chain 84, the transmission sprocket 81 drives the synchronous sprocket 83 to rotate, and the synchronous sprocket 83 drives the synchronous shaft 82 to rotate, which in turn causes the half-tooth bevel gear 85 located on the outside of the synchronous shaft 82 to rotate. When the door 11 rotates to be perpendicular to the box body 1, the half-tooth bevel gear 85 begins to mesh with the transmission bevel gear 86 and drives it to rotate. The transmission bevel gear 86 drives the movable tube 46 to rotate through the damping shaft 47, so that the opening of the movable tube 46 gradually faces the inside of the box body 1. Similarly, when the door 11 changes from the closed state to the open state, the opening of the movable tube 46 changes from facing the inside of the box body 1 to slightly facing the outside of the box body 1.

[0035] The driven member 9 comprises a driven shaft 91 rotatably arranged in the movable pipe 46, one end of the driven shaft 91 rotatably penetrates the movable pipe 46, the movable pipe 46 is arranged with a movable plate 92, the movable plate 92 is arranged outside the driven shaft 91 and rotates synchronously with the driven shaft 91, the driven shaft 91 is arranged with a driven sprocket one 93 outside, the damping shaft 47 is arranged with a driven sprocket two 94 outside, the driven sprocket one 93 and the driven sprocket two 94 are arranged with a driven chain 95 outside, the driven sprocket one 93 and the driven sprocket two 94 rotate synchronously through the driven chain 95, the movable pipe 46 drives the damping shaft 47 to rotate when rotating, the damping shaft 47 drives the driven shaft 91 to rotate through the driven sprocket one 93 and the driven sprocket two 94, when the movable pipe 46 rotates towards the inside of the box body 1, the movable pipe 46 drives the damping shaft 47 on the other side to rotate, so that the driven sprocket two 94 arranged outside the damping shaft 47 rotates, under the action of the driven chain 95, the driven sprocket two 94 drives the driven sprocket one 93 to rotate, the driven sprocket one 93 drives the driven shaft 91 to rotate, the driven shaft 91 drives the movable plate 92 to rotate, so that the opening of the movable pipe 46 becomes larger during the rotation towards the inside of the box body 1, so that the warm air can diffuse in the box body 1, and for the same reason, when the movable pipe 46 rotates towards the outside of the box body 1, the opening of the movable pipe 46 will become smaller, which can facilitate the stroke air curtain of the air supply mechanism 4.

[0036] The inner wall of the box body 1 is arranged with a mounting block 51, the temperature sensor 5 is movably inserted into the mounting block 51, a clamping groove 52 is formed in the base of the temperature sensor 5, a displacement groove 53 is formed in the mounting block 51, a clamping block 54 is arranged in the displacement groove 53, the clamping block 54 is a wedge-shaped mechanism, a positioning rod 55 is arranged on the clamping block 54, the positioning rod 55 movably penetrates the mounting block 51 and is arranged with a holding piece 56 at the end, a return spring 57 is arranged in the displacement groove 53 and fixedly connected with the clamping block 54 and the bottom of the displacement groove 53, when installing the temperature sensor 5, the base of the temperature sensor 5 is directly inserted into the mounting block 51, due to the wedge-shaped structure of the clamping block 54, the clamping block 54 will shrink into the displacement groove 53 under the action of the temperature sensor 5, when the temperature sensor 5 is completely inserted, the clamping block 54 is inserted into the clamping groove 52 to fix the temperature sensor 5 under the action of the return spring 57, on the contrary, when the temperature sensor 5 needs to be removed, the holding piece 56 is pulled to drive the clamping block 54 to separate from the clamping groove 52 through the positioning rod 55.

[0037] In summary, during the use of the tap protection box, when the temperature in the box 1 decreases, the air inlet 12 and the air outlet 13 are opened, the air supply mechanism 4 is started to send warm air into the box 1, when the adjustment is completed, the air inlet 12 and the air outlet 13 are closed again, when the box door 11 needs to be opened for maintenance of the box 1, the box door 11 drives the movable pipe 46 to rotate and at the same time makes the opening smaller, and the air supply mechanism 4 is started, the air curtain is formed in the box 1 to block the warm air in the box 1 from meeting the cold air outside, after the maintenance is completed, the box door 11 is closed, the movable pipe 46 is reoriented towards the box 1 and the opening is larger, which is convenient for adjusting the temperature in the box 1.

[0038] It should be noted that the relational terms herein such as first and second and the like are used solely to distinguish one from another entity or action, without necessarily requiring or implying any actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0039] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cable tap protection box for optical communication, comprising a box body (1), a rotating shaft (10) rotatably mounted on the box body (1), a box door (11) disposed on the outside of the rotating shaft (10), the box door (11) rotating synchronously with the rotating shaft (10), a working cavity (2) disposed inside the box body (1), and mounting cavities (3) disposed at the top and bottom of the working cavity (2), characterized in that: The installation cavity (3) is provided with a blowing mechanism (4), the side wall of the box (1) is provided with a temperature sensor (5), and the two sides of the box (1) are provided with air inlets (12), the installation cavity (3) is provided with a closure part one (6) for closing the air inlet (12), and the box (1) is provided with an air outlet (13) on one side, and the inner wall of the box (1) is provided with a closure part two (7) for closing the air outlet (13); The installation cavity (3) is provided with a transmission mechanism (8), the transmission mechanism (8) is in transmission connection with the box door (11) and the blowing mechanism (4), the blowing angle of the blowing mechanism (4) is changed through the transmission mechanism (8) when the box door (11) rotates, and the blowing mechanism (4) is provided with a driven part (9), when the blowing angle of the blowing mechanism (4) changes, the driven part (9) drives the size of the blowing port of the blowing mechanism (4) to adjust; The blowing mechanism (4) comprises an air inlet pipe (41) arranged at the air inlet (12), the air inlet pipe (41) is provided with an electric heating wire (42), the installation cavity (3) is provided with a blower (43), the air inlet of the blower (43) is connected with a cross pipe (44), the cross pipe (44) is provided with a hose (45) at the end, the end of the hose (45) is provided with a movable pipe (46), the movable pipe (46) is provided with a damping shaft (47) on both sides and rotates in the box (1) through the damping shaft (47); The transmission mechanism (8) comprises a transmission sprocket (81) arranged outside the rotating shaft (10), the installation cavity (3) is provided with a synchronous shaft (82) which rotates, the outer side of the synchronous shaft (82) is provided with a synchronous sprocket (83), the outer side of the synchronous sprocket (83) is provided with a synchronous chain (84), when the box door (11) rotates, the transmission sprocket (81) and the synchronous sprocket (83) are driven to rotate synchronously through the synchronous chain (84), the outer side of the synchronous shaft (82) is also provided with a half-tooth bevel gear (85), and the outer side of the damping shaft (47) is provided with a transmission bevel gear (86) engaged with the half-tooth bevel gear (85); The driven part (9) comprises a driven shaft (91) which rotates in the movable pipe (46), one end of the driven shaft (91) rotates through the movable pipe (46), the movable pipe (46) is provided with a movable plate (92), the movable plate (92) is arranged outside the driven shaft (91) and rotates synchronously with the driven shaft (91), the outer side of the driven shaft (91) is provided with a driven sprocket one (93), the outer side of the damping shaft (47) is provided with a driven sprocket two (94), the outer side of the driven sprocket one (93) and the driven sprocket two (94) is provided with a driven chain (95), the driven sprocket one (93) and the driven sprocket two (94) are driven to rotate synchronously through the driven chain (95), the damping shaft (47) is driven to rotate when the movable pipe (46) rotates, and the damping shaft (47) drives the driven shaft (91) to rotate through the driven sprocket one (93) and the driven sprocket two (94).

2. The cable breakout enclosure for optical communications of claim 1, wherein: The hose (45) is a bellows.

3. The cable breakout enclosure for optical communications of claim 1, wherein: The closure one (6) includes a drive motor (61) arranged on the inner wall of the box (1), the output end of the drive motor (61) is provided with a lead screw (62), the inner wall of the box (1) is provided with a bearing seat (63), and the lead screw (62) is rotatably arranged on the bearing seat (63) through a bearing. The inner wall of the box (1) is provided with a guide rail (64), the guide rail (64) is movably provided with a closure plate one (65), the closure plate one (65) is threadedly sleeved on the lead screw (62), and the air inlet pipe (41) is provided with a side slot (66), when the drive motor (61) is started, the closure plate one (65) is driven by the lead screw (62) to close the air inlet pipe (41).

4. The cable breakout enclosure for optical communications of claim 1, wherein: The inner wall of the box (1) is provided with a chute (71) at the air outlet (13), the closure two (7) includes a closure plate two (72) movably arranged in the chute (71), the chute (71) is provided with an electric push rod (73), the electric push rod (73) is provided with a connecting block (74) at the end, and the connecting block (74) is fixedly connected with the closure plate two (72).

5. The cable breakout enclosure for optical communications of claim 1, wherein: The inner wall of the box (1) is provided with a mounting block (51), the temperature sensor (5) is movably inserted into the mounting block (51), the base of the temperature sensor (5) is provided with a clamping groove (52), the mounting block (51) is provided with a displacement slot (53), the displacement slot (53) is provided with a clamping block (54), the clamping block (54) is provided with a positioning rod (55), the positioning rod (55) is movably inserted into the mounting block (51) and provided with a holding piece (56) at the end, the displacement slot (53) is provided with a reset spring (57), and the two ends of the reset spring (57) are fixedly connected with the clamping block (54) and the bottom of the displacement slot (53).

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