Flat opening type threshold-free electric shielding door

Abstract

The utility model discloses a flat opening type threshold-free electric shielding door, and relates to the technical field of shielding doors. Comprising a main door body connected with a door frame through hinges, and a first driving mechanism used for driving the main door body to rotate is arranged on the main door body; the auxiliary door body is mounted on the main door body and is in sliding fit with the main door body in the vertical direction; the movable shielding body is mounted on the auxiliary door body and is in sliding fit with the auxiliary door body in the horizontal direction; the second driving mechanism is mounted on the auxiliary door body and is used for driving the auxiliary door body to lift and driving the movable shielding body to translate; the guide rail is arranged in a door groove in the front side of the door frame; and the moving trolley is in sliding fit with the guide rail, and in the door opening state, the moving trolley slides to the front of the door frame to fill and level up the door groove. The requirement for transferring large equipment is met through the threshold-free design, and meanwhile the beryllium copper reeds can be prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of shielding doors, in particular to a flat-opening electric shielding door without a threshold. Background Art

[0002] An electromagnetic shielding door is a device that isolates electromagnetic waves. It can isolate external electromagnetic interference, protect the normal operation of indoor equipment, or block the spread of indoor electromagnetic radiation to the outside world, preventing the leakage of electronic communication information.

[0003] Existing electromagnetic shielding doors are mainly divided into swing and push-pull types. Among them, swing shielding doors are basically manual shielding doors with a low degree of automation. They are all equipped with fixed or detachable thresholds, which makes it difficult to transport large equipment. Due to the structural problems of the swing design, the blade on the hinge side has a large rotation angle, and the shielding beryllium copper reed is often compressed and deformed too much and damaged, affecting the shielding effect.

[0004] Therefore, how to develop a shielding door that can meet the needs of large equipment transportation and avoid damage to the beryllium copper reed is one of the problems that need to be solved urgently. Utility Model Content

[0005] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present invention is to provide a swing-type threshold-free electric shielding door, which meets the needs of large equipment transportation through the threshold-free design and can avoid damage to the beryllium copper reed.

[0006] In a first aspect, the utility model provides a swing-type threshold-free electric screen door, comprising:

[0007] The main door body is connected to the door frame via a hinge, and the main door body is provided with a first driving mechanism for driving the main door body to rotate;

[0008] The auxiliary door body is installed on the main door body and slides with the main door body in the vertical direction;

[0009] The movable shielding body is installed on the auxiliary door body and slides with the auxiliary door body in the horizontal direction;

[0010] A second driving mechanism is installed on the auxiliary door body, driving the auxiliary door body to rise and fall and the movable shielding body to move horizontally;

[0011] A guide rail is provided in the door slot on the front side of the door frame;

[0012] The movable trolley is in sliding cooperation with the guide rail. When the door is open, the movable trolley slides to the front of the door frame to fill the door groove.

[0013] In certain embodiments of the first aspect of the present invention, the first driving mechanism includes a motor and a connecting rod, one end of the connecting rod is connected to the output shaft of the motor, and the other end of the connecting rod is connected to the hinge shaft of the hinge.

[0014] In certain embodiments of the first aspect of the present invention, the main door body and / or the auxiliary door body adopt a frame structure, and the main door body is located between the auxiliary door body and the movable shielding body.

[0015] In certain embodiments of the first aspect of the present invention, the second driving mechanism includes:

[0016] A first transmission chain is used to drive the auxiliary door body to vertically lift; the first transmission chain includes at least one vertically arranged first elevator and a first coupling mechanism for driving the output end of the first elevator to lift vertically;

[0017] a second transmission chain for driving the movable shielding body to translate horizontally; the second transmission chain comprises at least one horizontally arranged second elevator and a second coupling mechanism for driving the output end of the second elevator to translate horizontally;

[0018] A dual-output shaft motor includes a first output shaft and a second output shaft, wherein the first output shaft is connected to a first coupling mechanism via a first clutch; and the second output shaft is connected to a second coupling mechanism via a second clutch.

[0019] In certain embodiments of the first aspect of the present invention, the first coupling mechanism includes a vertically arranged first transmission shaft and a horizontally arranged second transmission shaft; the first end of the first transmission shaft and the first end of the second transmission shaft are connected via a first commutator, the second end of the first transmission shaft is connected to the first output shaft of the dual-output shaft motor via a first clutch, and the second end of the second transmission shaft is connected to the first elevator.

[0020] In certain embodiments of the first aspect of the present invention, the second coupling mechanism includes a third transmission shaft arranged horizontally and a fourth transmission shaft arranged vertically; the first end of the third transmission shaft is connected to the second clutch via a second commutator; the second end of the third transmission shaft and the first end of the fourth transmission shaft are connected via a third commutator, and the second end of the fourth transmission shaft is connected to the second elevator.

[0021] In certain embodiments of the first aspect of the present utility model, the mobile cart includes a body, guide wheels and running wheels arranged at the bottom of the body, and the guide wheels slide / roll with the guide rails; the door groove includes a running groove and a guide groove arranged from top to bottom, the width of the running groove is larger than the guide groove, the guide rail and guide wheel are located in the guide groove, and the running wheel is in contact with the bottom of the running groove.

[0022] In certain embodiments of the first aspect of the present invention, it also includes an outer shell and an inner sliding block that are arranged mutually in a vertical direction, the outer shell is fixed on the vehicle body, and the running wheel is installed on the inner sliding block; a disc spring is arranged between the outer shell and the inner sliding block; in a no-load state, the disc spring applies upward pressure to the outer shell and the vehicle body, so that the top of the vehicle body is higher than the ground; in a loaded state, the vehicle body sinks and is level with the ground.

[0023] In certain embodiments of the first aspect of the present invention, a reinforcing support portion is provided on the guide rail at a position directly in front of the door frame, and the reinforcing support portion protrudes upward on the upper side of the guide rail.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. The utility model improves the traditional full-section casement opening method into a casement and translation method for opening and closing the door. Shielding is achieved by the relative translation of the mobile shielding body and the door frame. Therefore, it can avoid the damage caused by excessive compression and deformation of the beryllium copper spring due to the large rotation angle of the insert blade on one side of the hinge in the traditional full-section casement opening method.

[0026] 2. The utility model adopts a mobile trolley to fill the door groove on the front side of the door frame, thereby realizing a threshold-free design to meet the needs of transporting large equipment. At the same time, the auxiliary door body is lifted and lowered to avoid the guide rail during the horizontal opening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0028] Figure 2 This is a schematic diagram of the three-layer door structure of the present utility model.

[0029] Figure 3 for Figure 2 A partial enlarged view of point A in the middle.

[0030] Figure 4 It is a side view of the three-layer door body of the present utility model.

[0031] Figure 5 This is a schematic structural diagram of the second driving mechanism of the present utility model.

[0032] Figure 6 This is a schematic diagram of the principle of the second driving mechanism of the present utility model.

[0033] Figure 7 This is a schematic structural diagram of the guide rail and mobile trolley of the utility model.

[0034] Figure 8 for Figure 7 A partial enlarged view of point B.

[0035] Figure 9 This is a cross-sectional view of the guide rail and mobile trolley of the utility model.

[0036] Figure 10 This is a schematic diagram of the installation of the travel wheel of the present utility model.

[0037] In the picture:

[0038] 1. Main door body; 10. First drive mechanism; 11. Hinge; 12. Motor; 13. Connecting rod;

[0039] 2. Auxiliary door body; 21. Sliding column; 22. Sliding seat;

[0040] 3. Mobile shielding body;

[0041] 4. Door frame;

[0042] 5. Second drive mechanism; 51. First transmission chain; 511. First elevator; 512. First transmission shaft; 513. Second transmission shaft; 514. First commutator; 515. First manual commutator; 52. Second transmission chain; 521. Second elevator; 522. Third transmission shaft; 523. Fourth transmission shaft; 524. Second commutator; 525. Third commutator; 526. Second manual commutator; 527. Third elevator; 53. Dual-output shaft motor; 531. First clutch; 532. Second clutch;

[0043] 6. Guide rail; 61. Strengthen support part;

[0044] 7. Mobile trolley; 71. Car body; 72. Guide wheels; 73. Travel wheels;

[0045] 8. Door slot; 81. Guide slot; 82. Walking slot. DETAILED DESCRIPTION

[0046] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0047] Please refer to Figure 1 This embodiment provides a flat-opening threshold-free electric shielding door, including a main door body 1, an auxiliary door body 2, a movable shielding body 3, a second driving mechanism 5, a guide rail 6 and a movable trolley 7.

[0048] Please refer to Figure 2 and Figure 4 The main door body 1, the auxiliary door body 2, and the movable shielding body 3 constitute a three-layer door body mechanism, which is specifically as follows:

[0049] The main door body 1 is an integral frame structure connected to the door frame 4 via a hinge 11. A first drive mechanism 10 is provided on the main door body 1 for driving the rotation of the main door body 1. The first drive mechanism 10 includes a motor 12 and a connecting rod 13. One end of the connecting rod 13 is connected to the output shaft of the motor 12, and the other end of the connecting rod 13 is connected to the hinge axis of the hinge 11. The operation of the motor 12 allows the main door body 1 to rotate about the hinge axis relative to the door frame 4, thereby achieving opening and closing of the main door body 1.

[0050] The auxiliary door body 2 also adopts a frame structure as a whole, is installed on the main door body 1, and slides with the main door body 1 in the vertical direction. Figure 3 The auxiliary door body 2 is fixed with a slide column 21 extending in the vertical direction, and the main door body 1 is fixed with a slide seat 22. The slide column 21 slides with the slide seat 22. Therefore, the auxiliary door body 2 can slide along the extension direction of the slide column 21, which is equivalent to the main door body 1.

[0051] The movable shielding body 3 is a structure that ultimately achieves shielding with the door frame 4 , and adopts an integral fully enclosed panel. The main door body 1 is located between the auxiliary door body 2 and the movable shielding body 3 .

[0052] The movable shielding body 3 is mounted on the auxiliary door body 2 and slides horizontally with the auxiliary door body 2. One of the movable shielding body 3 and the door frame 4 is provided with blades around its periphery, and the other is provided with a beryllium copper spring at a corresponding position. The blades and the beryllium copper spring together form a shielding mechanism, and when the two are connected, electromagnetic shielding can be achieved.

[0053] Through the above-mentioned three-layer door structure, during the shielding process, the movable shielding body 3 can be moved horizontally relative to the door frame 4 to ensure that the movable shielding body 3 and the door frame 4 are always parallel. In other words, the gap and compression between the inserting knife and the spring are always kept uniform and consistent, avoiding the situation in which the inserting knife on the hinge side rotates at a large angle in the traditional casement process, and the shielding beryllium copper spring is often compressed and deformed too much and damaged.

[0054] In order to realize the movement of the auxiliary door body 2 and the movable shielding body 3, this embodiment further provides a second driving mechanism 5, which is installed on the auxiliary door body 2 to drive the auxiliary door body 2 to rise and fall and the movable shielding body 3 to move horizontally.

[0055] For details, please refer to Figure 5 and Figure 6 The second driving mechanism 5 includes a first transmission chain 51, a second transmission chain 52 and a dual-output shaft motor 53.

[0056] The first transmission chain 51 is used to drive the auxiliary door body to move vertically up and down. The first transmission chain 51 includes at least one vertically arranged first elevator 511 and a first coupling mechanism for driving the output end of the first elevator 511 to move vertically up and down.

[0057] It is worth mentioning that the vertical arrangement of the first elevator 511 means that the output shaft of the first elevator 511 can move in the vertical direction. In addition, the end of the output shaft of the first elevator 511 is connected to the main door body 1, thereby achieving relative lifting of the main door body 1 and the auxiliary door body 2.

[0058] Specifically, the first coupling mechanism includes a vertically arranged first transmission shaft 512 and a horizontally arranged second transmission shaft 513. The first end of the first transmission shaft 512 and the first end of the second transmission shaft 513 are connected via a first commutator 514 to transmit the rotation of the vertically arranged first transmission shaft 512 to the horizontally arranged second transmission shaft 513.

[0059] The second end of the second transmission shaft 513 is connected to the first elevator 511 , thereby driving the first elevator 511 to work, thereby realizing relative movement in the vertical direction between the auxiliary door body 2 and the main door body 1 connected to the first elevator 11 .

[0060] In a more preferred embodiment, the first commutator 511 is a 1-LR type commutator.

[0061] In order to enhance the stability of the vertical lifting motion, there are two first lifters 511 symmetrically distributed on the left and right sides of the first diverter 514 . The two first lifters 511 are connected to the left and right sides of the first diverter 514 via the second transmission shaft 513 .

[0062] The second transmission chain 52 is used to drive the movable shielding body 3 to translate horizontally relative to the auxiliary door body 2. The second transmission chain 52 includes at least one horizontally arranged second elevator 521 and a second coupling mechanism for driving the output end of the second elevator 521 to translate horizontally.

[0063] Similarly, the horizontal arrangement of the second elevator 521 means that the output shaft of the second elevator 521 can move horizontally. Furthermore, the distal end of the output shaft of the second elevator 521 is connected to the movable shielding body 3, thereby enabling relative translation between the auxiliary door body 2 and the movable shielding body 3. It is worth noting that the middle portion of the output end of the second elevator 521 passes through a gap in the frame of the main door body 1.

[0064] Specifically, the second coupling mechanism includes a horizontally disposed third transmission shaft 522 and a vertically disposed fourth transmission shaft 523. The second end of the third transmission shaft 522 and the first end of the fourth transmission shaft 523 are connected via a third commutator 525 to transmit the rotation of the horizontally disposed third transmission shaft 522 to the vertically disposed fourth transmission shaft 523.

[0065] The second end of the fourth transmission shaft 523 is connected to the second elevator 521 , thereby driving the second elevator 521 to work and realizing the horizontal translation of the movable shielding body 3 connected to the second elevator 521 .

[0066] To enhance translation stability, two second elevators 521 are symmetrically distributed on the left and right sides of the first transmission shaft 512. The two second elevators 521 are connected to the left and right sides of the second commutator 524 via the fourth transmission shaft 523, the third commutator 525, and the third transmission shaft 522, respectively.

[0067] The dual-output shaft motor 53 includes a first output shaft and a second output shaft.

[0068] The first output shaft is connected to the first coupling mechanism via the first clutch 531. Specifically, the second end of the first transmission shaft 512 is connected to the first output shaft of the dual-output shaft motor via the first clutch 531.

[0069] The second output shaft is connected to the second coupling mechanism via the second clutch 532. Specifically, the first end of the third transmission shaft 522 is connected to the second clutch via the second commutator 524.

[0070] When the first transmission chain is required to operate, the first clutch 531 is engaged, the second clutch 532 is disengaged, and the dual-output shaft motor 53 is connected to the first transmission chain. Conversely, when the second transmission chain is required to operate, the second clutch 532 is engaged, the first clutch 531 is disengaged, and the dual-output shaft motor 53 is connected to the second transmission chain. The operating order of the two transmission chains can be determined according to actual usage conditions, and they do not affect each other.

[0071] Preferably, the fourth transmission shaft 523 extends from the third diverter 525 toward one side of the first elevator 511 , so that the second elevator 521 is approximately located in the middle of the first transmission shaft 512 in terms of height.

[0072] In order to further enhance the stability of the translational motion, a horizontally arranged third elevator 527 is further connected to the side of the third diverter 525 away from the second elevator 521 .

[0073] The two second elevators 521 and the two third elevators 527 are symmetrical to each other, forming a 2*2 array distribution.

[0074] It is worth mentioning that the first commutator, the second commutator and the third commutator are preferably 1-LR type commutators. The first transmission shaft, the second transmission shaft, the third transmission shaft and the fourth transmission shaft are respectively provided with universal joint couplings at both ends, such as Figure 6 The small circle in the figure shows the universal joint coupling.

[0075] In order to prevent the system from not being able to work properly when the motor fails, this embodiment also provides a U-LR type manual commutator on the first transmission shaft 512 and / or the fourth transmission shaft 523. Figures 5 and 6 As shown, the first transmission shaft 512 is provided with a first manual reversing device 515, and the fourth transmission shaft 523 is provided with a second manual reversing device 526. It is worth mentioning that there are two fourth transmission shafts 523, and the second manual reversing device 526 can be provided on only one of them.

[0076] Please refer to Figure 1 and Figure 9 The guide rail 6 is arranged in the door groove 8 on the front side of the door frame 4.

[0077] The mobile trolley 7 slides with the guide rail 6. When the door is open, the mobile trolley 7 slides to the front of the door frame 4 and fills the door groove 8, thereby realizing a door frame-less design and meeting the needs of large equipment transportation and vehicle accessibility.

[0078] Specifically, the mobile vehicle 7 includes a vehicle body 71 and a guide wheel 72 provided at the bottom of the vehicle body 71 . The guide wheel 72 is in sliding / rolling cooperation with the guide rail 6 .

[0079] The door slot 8 includes a running slot 82 and a guide slot 81 arranged from top to bottom. The width of the running slot 82 is greater than that of the guide slot 81 , thereby forming a substantially T-shaped door slot 8 .

[0080] The guide rail 6 and the guide wheel 72 are located in the guide groove 81 ; the vehicle body 71 is further provided with a running wheel 72 , and the running wheel 72 is in contact with the bottom of the running groove 82 .

[0081] like Figure 9 and Figure 10 As shown, in order to reduce the pressure between the moving trolley 7 and the guide rail 6 when unloaded, thereby reducing friction, it also includes an outer shell 731 and an inner sliding block 732 that are arranged on each other in the vertical direction. The outer shell 731 is fixed on the vehicle body 71, and the walking wheel 73 is installed on the inner sliding block 732; a disc spring 733 is arranged between the outer shell 731 and the inner sliding block 732.

[0082] In the unloaded state (i.e., no-load), the disc spring 733 applies upward pressure to the outer shell 731 and the vehicle body 71, lifting the mobile trolley 7 so that the top of the vehicle body 71 is higher than the ground. At this time, the pressure between the guide rail 3 and the guide wheel 72 becomes smaller or even the two do not contact, so that the sliding friction force also decreases.

[0083] Under load (i.e., the vehicle or large equipment presses on the moving trolley during travel), the disc spring 733 is compressed, and the vehicle body 71 sinks accordingly until it is level with the ground. At this time, the guide wheel 72 and the running wheel 73 jointly bear the weight of the vehicle or large equipment, and the running wheel 73 will not be damaged due to excessive pressure.

[0084] At the same time, in order to realize the movement of the mobile car 7, as Figure 8 and Figure 9 As shown, a rack 74 is provided on the vehicle body 7 and is parallel to the guide rail 6. In addition, a motor 75 is provided on the guide rail 6 or the ground. The output shaft of the motor 75 is provided with a gear 76 that meshes with the rack 74. When the motor 75 is working, the gear 76 drives the rack 74 to move along the guide rail 6, thereby driving the movement of the mobile vehicle 7.

[0085] In order to adapt to the transportation of large equipment, it is necessary to strengthen the part of the guide rail 6. For details, please refer to Figure 7 The guide rail 6 is provided with a reinforcing support portion 61 at a position directly in front of the door frame. The reinforcing support portion 61 protrudes upward on the upper side of the guide rail 6. The thickness of the reinforcing support portion 61 is greater than the side wall thickness of the guide rail 6 at other positions.

[0086] The working method of the flat-opening threshold-free electric screen door of this embodiment is as follows:

[0087] Door opening process: The auxiliary door body drives the movable shielding body to rise until it is above the guide rail. The main door body drives the auxiliary door body and the movable shielding body to rotate over the guide rail until they are parallel to the door frame. The auxiliary door body drives the movable shielding body to descend until the movable shielding body is facing the door frame. The movable shielding body moves horizontally toward the door frame until the two are in contact to form a shield.

[0088] Door closing process: The movable shielding body moves away from the door frame until the two are separated. The auxiliary door body drives the movable shielding body to rise until it is above the guide rail. The main door body drives the auxiliary door body and the movable shielding body to rotate over the guide rail until they are fully opened. The mobile trolley moves to the front of the door frame and fills the door groove.

[0089] 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 present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.

Claims

1. A flat-opening electric screen door without threshold, characterized in that: include: The main door body is connected to the door frame via a hinge, and the main door body is provided with a first driving mechanism for driving the main door body to rotate; The auxiliary door body is installed on the main door body and slides with the main door body in the vertical direction; The movable shielding body is installed on the auxiliary door body and slides with the auxiliary door body in the horizontal direction; A second driving mechanism is installed on the auxiliary door body, driving the auxiliary door body to rise and fall and the movable shielding body to move horizontally; A guide rail is provided in the door slot on the front side of the door frame; The movable trolley is in sliding cooperation with the guide rail. When the door is open, the movable trolley slides to the front of the door frame to fill the door groove.

2. The horizontal opening type threshold-free electric screen door according to claim 1, characterized in that: The first driving mechanism includes a motor and a connecting rod, one end of the connecting rod is connected to the output shaft of the motor, and the other end of the connecting rod is connected to the hinge shaft of the hinge.

3. The horizontal opening type threshold-free electric screen door according to claim 1, characterized in that: The main door body and / or the auxiliary door body adopt a frame structure, and the main door body is located between the auxiliary door body and the movable shielding body.

4. A horizontally opened threshold-free electric screen door according to claim 1 or 3, characterized in that: The second driving mechanism comprises: A first transmission chain is used to drive the auxiliary door body to vertically lift; the first transmission chain includes at least one vertically arranged first elevator and a first coupling mechanism for driving the output end of the first elevator to lift vertically; a second transmission chain for driving the movable shielding body to translate horizontally; the second transmission chain comprises at least one horizontally arranged second elevator and a second coupling mechanism for driving the output end of the second elevator to translate horizontally; A dual-output shaft motor includes a first output shaft and a second output shaft, wherein the first output shaft is connected to a first coupling mechanism via a first clutch; and the second output shaft is connected to a second coupling mechanism via a second clutch.

5. The horizontal opening type threshold-free electric screen door according to claim 4, characterized in that: The first coupling mechanism includes a first transmission shaft arranged vertically and a second transmission shaft arranged horizontally; the first end of the first transmission shaft and the first end of the second transmission shaft are connected via a first commutator, the second end of the first transmission shaft is connected to the first output shaft of the dual-output shaft motor via a first clutch, and the second end of the second transmission shaft is connected to the first elevator.

6. The horizontal opening type threshold-free electric screen door according to claim 4, characterized in that: The second coupling mechanism includes a third transmission shaft arranged horizontally and a fourth transmission shaft arranged vertically; the first end of the third transmission shaft is connected to the second clutch via a second commutator; the second end of the third transmission shaft and the first end of the fourth transmission shaft are connected via a third commutator, and the second end of the fourth transmission shaft is connected to the second elevator.

7. The horizontal opening type threshold-free electric screen door according to claim 1, characterized in that: The mobile trolley includes a vehicle body, guide wheels and running wheels arranged at the bottom of the vehicle body, and the guide wheels slide / roll in cooperation with the guide rails; the door slot includes a running slot and a guide slot arranged from top to bottom, the width of the running slot is larger than the guide slot, the guide rails and guide wheels are located in the guide slots, and the running wheels are in contact with the bottom of the running slots.

8. The horizontal opening type threshold-free electric screen door according to claim 7, characterized in that: It also includes an outer shell and an inner sliding block that are arranged mutually in the vertical direction, the outer shell is fixed on the vehicle body, and the running wheel is installed on the inner sliding block; a disc spring is arranged between the outer shell and the inner sliding block; in a no-load state, the disc spring applies upward pressure to the outer shell and the vehicle body, so that the top of the vehicle body is higher than the ground; in a loaded state, the vehicle body sinks and is level with the ground.

9. The horizontal opening type threshold-free electric screen door according to claim 7 or 8, characterized in that: The guide rail is provided with a reinforcing support portion at a position directly in front of the door frame, and the reinforcing support portion protrudes upward on the upper side of the guide rail.

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