CN113306586B - Roof side beam, roof and railway vehicle - Google Patents

Abstract

The invention discloses a roof side beam, which is characterized in that: comprises a roof main boundary beam and an auxiliary boundary beam; the roof main side beam is of an integral structure and comprises a base body and a connecting part, the lower end of the base body is used for being connected with a side wall of a vehicle body, the connecting part is used for being connected with a first roof, and the base body is of a full-length structure in the longitudinal direction; the lower end of the auxiliary edge beam is welded and fixed with the base body, and the upper end of the auxiliary edge beam is used for connecting a second roof; in the longitudinal direction, part of the base body is correspondingly provided with the auxiliary edge beam, part of the base body is correspondingly provided with the connecting part, and the part provided with the auxiliary edge beam is not provided with the connecting part; the second roof is higher than the first roof. The main side beam of the car roof has the advantages of simple structure of the full-length roof, convenient drainage, effective prevention of water accumulation on the car roof, and has the characteristics of small pneumatic resistance of the high roof and the low roof, continuous appearance and the like; the modular degree of roof boundary beam is high, the commonality is strong, is favorable to reducing automobile body weight.

Description

Roof side beam, roof and railway vehicle

Technical Field

The invention relates to a roof side rail, a roof and a rail vehicle, belongs to the technical field of rail vehicles, and particularly relates to the technical field of roof side rails.

Background

The subway vehicle has a large number of users and has a large requirement on the individuation of the vehicle technology. At present, the types of the return air of the air conditioner of the guest room only include three types of end return, bottom return and end return. The concentrated return air and the dispersed return air are distinguished in the bottom feeding and bottom returning. And A, B type vehicle refrigeration heating volume demand is different, and northern and southern climatic difference is big, leads to air conditioner power inconsistent, produces great influence to the specification size of air conditioner self, and then leads to the air conditioning unit mounting platform structure type of automobile body various. For a vehicle body, a vehicle roof mainly comprises two structures of a high roof, a low roof and a full-length low arc roof.

The high-low top vehicle body structure fully utilizes the limited space of the vehicle, the vehicle body properly sinks at the distribution part of the air conditioning unit, the air conditioning installation platform with lower height is arranged, and the rest parts are high arc structures, so that the rigidity of the whole structure is high, the continuity of the top of the vehicle is good, and the appearance is attractive; however, in the existing vehicle body with a high-low top section, the air conditioner mounting platform is basically of a flat top structure, welding deformation is easy to generate in the manufacturing process, water is easy to accumulate in the vehicle operation process, and potential safety hazards are brought. A roof side rail profile disclosed in patent document 1 (application No. CN 201180067434) has two types of joints, namely a high joint and a flat joint, the flat joint faces the inside of a vehicle compartment horizontally, a flat-top structure of the roof side rail profile is prone to welding deformation, and vehicle vibration during operation releases welding residual stress, so that a risk of sagging downwards occurs, and water accumulation is caused. In addition, the roof side rail in patent document 1 has both the high joint and the flat joint, but in actual use, only the high joint or the flat joint is used for any one section of the roof, which does not make full use of the roof side rail, and causes an increase in the weight of the vehicle body and a waste of materials.

The roof of the full-length low-arc roof vehicle body is generally in a micro arc shape, so that water is conveniently drained, the structure is simple, the manufacturing cost is low, equipment is conveniently added, the weight is lighter, the rigidity of the vehicle body is reduced, the air conditioning unit is exposed in the visual field of passengers in a large range, and the structure is poor in continuity and not attractive enough. At present, the commonly adopted measure is that a glass fiber reinforced plastic air guide sleeve is generally additionally arranged at the train head part, so that the train head is convenient to continuously and smoothly shape, and the air resistance in the running process of a train is reduced. However, for a vehicle with an air conditioner arranged in the longitudinal middle (the air resistance of the vehicle at 120 km/h has a larger influence, so that the running resistance is generally reduced by arranging a diversion cover), the distance between the cab hood and the air conditioner is longer, even can reach more than 5 m, the diversion cover is also considered to bear the weight of maintainers, the strength requirement is high, the vehicle weight is obviously increased by additionally arranging the diversion cover with overlong length, and the control of the axle weight of the train becomes extremely difficult.

Disclosure of Invention

The invention provides a roof side rail, which aims to enable a roof to have a high roof and a low roof and reduce the weight of the roof side rail. The specific technical scheme is as follows.

A roof side rail, characterized in that: comprises a roof main boundary beam and an auxiliary boundary beam; the roof main side beam is of an integral structure and comprises a base body and a connecting part, the lower end of the base body is used for connecting a side wall of a vehicle body, the connecting part is used for connecting a first roof, and the base body is of a full-length structure in the longitudinal direction; the lower end of the auxiliary edge beam is welded and fixed with the base body, and the upper end of the auxiliary edge beam is used for connecting a second roof; in the longitudinal direction, part of the base body is correspondingly provided with the auxiliary edge beam, part of the base body is correspondingly provided with the connecting part, and the part provided with the auxiliary edge beam is not provided with the connecting part; the second roof is higher than the first roof.

Further, roof main boundary beam and supplementary boundary beam are the section bar, and roof boundary beam's processing mode does: and obtaining a base body and a connecting part with a full-length structure through extrusion, then removing part of the connecting part in a machining mode to form a roof main side beam, and welding and fixing the auxiliary side beam at the position where the connecting part is removed.

By adopting the technical scheme, the high-low top processing of the vehicle body can be realized more simply and conveniently; in short, the first roof (low roof) is connected to the connecting portion of the roof side rail, and the portion of the roof side rail in the longitudinal direction has no connecting portion, and the section having no connecting portion is fixedly connected to the auxiliary side rail by welding, so that the second roof (high roof) can be connected to the auxiliary side rail. It should be noted that: the longitudinal direction (longitudinal direction) refers to the length direction of the vehicle body, and the transverse direction is the width direction of the vehicle body; the full-length structure is that the length of the base body in the longitudinal direction is not less than the length of the whole vehicle body roof in the longitudinal direction. Wherein, when viewed in cross section, the part removed by machining is the connecting part, and the rest part is the substrate.

Compared with the prior art, the roof side rail connecting structure has the advantages that the roof side rails for connecting different roofs are formed in different modes, joints of the roof side rails cannot be left unused, and the weight of the roof side rails is reduced to the maximum extent while the high-low roof is achieved. Also, the longitudinal length of the high roofs is typically much smaller than the longitudinal length of the low roofs, i.e. there is also a limit to the material removed by machining. When the roof side rail is applied to the middle vehicle body having only the first roof (the lower roof), the roof side rail does not need to be machined, and the auxiliary side rail does not need to be arranged; the modular roof side rail structure is beneficial to modularization and universalization of the roof side rail of the whole train.

Further, the auxiliary side member is located at the front of the vehicle body in the longitudinal direction than the connecting portion. By adopting the arrangement mode, the passenger room air conditioning unit can be arranged in the middle of the vehicle body and is positioned on the first roof (low roof), the second roof (high roof) is positioned in the front of the vehicle body, the outer contour of the passenger room air conditioning unit can be basically consistent with that of the second roof (high roof), the smoothness and continuity of the outer surface of the vehicle roof are kept, the integral strength of the vehicle body is improved by adopting the high roof and the low roof, and meanwhile, a glass fiber reinforced plastic air guide cover in the prior art can be eliminated, and the weight of the vehicle body is further reduced.

Furthermore, the inner side of the connecting part is provided with a C-shaped section, the inner side of the auxiliary edge beam is also provided with a C-shaped section, and the C-shaped section of the connecting part and the C-shaped section of the auxiliary edge beam are superposed with each other when viewed along the longitudinal direction. The passenger room door mounting interface of the first roof section is completely consistent with that of the second underbody section, namely the mounting structure of the vehicle body does not have difference due to different heights of the roofs.

Furthermore, the base body is provided with a rain eave, and the rain eave is simultaneously positioned on the outer sides of the connecting part and the auxiliary edge beam. The rain eaves are a groove structure with an upward opening and are used for collecting and guiding rain water on the vehicle roofs (the first vehicle roof and the second vehicle roof). Through the setting of eaves, solve among the prior art problem of the easy ponding of flatcar top. The outboard side is defined relative to the interior and exterior of the vehicle body.

Furthermore, the upper part of the base body is provided with a connecting transverse rib, the connecting part is provided with an inner connecting rib and an outer connecting rib, and the inner connecting rib and the outer connecting rib are respectively positioned at two sides of the connecting transverse rib; after the connecting part is removed in a machining mode, welding joints are arranged at two ends of the connecting transverse rib; and the auxiliary boundary beam is welded and fixed with the welding joint.

Furthermore, the auxiliary edge beam is provided with a triangular inner side connecting rib, an inner rib and a connecting transverse rib, and two ends of the connecting transverse rib of the auxiliary edge beam are also provided with welding joints for welding connection of the base body; and observe along longitudinal direction, the inboard splice bar of connecting portion with the inboard splice bar of supplementary boundary beam coincides each other, the outside splice bar of connecting portion with the interior muscle of supplementary boundary beam coincides each other. The arrangement is favorable for improving the continuity of the auxiliary side beam and the connecting part in the longitudinal direction of the vehicle body and improving the overall strength of the vehicle body.

Based on the same inventive concept, the invention also relates to a roof, which comprises the roof side beam, wherein the first roof is a low arc roof, and the second roof is a high arc roof.

Furthermore, the first roof and the second roof are connected by adopting a partition wall, the upper end of the partition wall is provided with an F-shaped joint, and the lower end of the partition wall is provided with an L-shaped joint; the F-shaped joint is connected with the upper surface and the lower surface of the second roof, and the L-shaped joint is connected with the lower surface of the first roof. This arrangement allows the roof to be held at a certain adjustment in the vertical direction during manufacture.

Based on the same conception, the invention also relates to a railway vehicle which comprises the roof side rail, wherein the lower end of the base body of the roof main side rail is connected with the upper end of the door upright post, and a part of the base body is removed by machining to form an arc-shaped door corner.

Further, the lower end of the base body has an inner stud and an outer stud, and the radius R1 of the inner stud is smaller than the radius R2 of the outer stud at the arc-shaped door corner.

Compared with the prior art, the invention has the following beneficial effects.

1) The high-arc roof can be arranged at the front end of the head car, the advantage of simple structure of the full-length roof is achieved, water drainage is convenient, water accumulation on the roof is effectively avoided, and the high-arc roof and the low-arc roof have the characteristics of small pneumatic resistance, continuous appearance and the like.

2) The low arc top and the high arc top can be set as independent modules, so that the installation is convenient. The air conditioning units are distributed in the middle and are suitable for subway vehicles with the speed per hour of 120km and above, air conditioners for vehicles with the speed per hour of 80km can be distributed at 1/4 and 3/4 or at two ends of the vehicles, and at the moment, a high arc roof structure can be cancelled, and the high arc roof structure comprises a head vehicle and a middle vehicle which can all adopt low arc roofs. The side wall, the chassis and other parts do not need to be correspondingly changed, the installation of equipment such as a vehicle door is not influenced, and the modularization degree of the roof side beam is high and the universality is high.

3) Compared with the car roof additionally provided with the glass fiber reinforced plastic air guide sleeve, the high arc top is arranged, so that the low arc top at the corresponding part can be eliminated, the weight is lighter, the service life is longer, and the performance is more reliable.

4) The roof main boundary beam base body is not broken in length and has good strength continuity.

5) The connecting part of the main side beam of the car roof is only machined at the local high arc top part, so that the machining amount is very small, the cost is low, and the car roof is economical and practical.

Drawings

FIG. 1 is a schematic view of a head vehicle body construction of the present invention;

FIG. 2 is a schematic view of the structure of the center body;

FIG. 3 is a schematic cross-sectional view of a vehicle body;

FIG. 4 is a schematic first cross-sectional view of a roof main side rail (section with attachment);

FIG. 5 is a schematic second cross-sectional view of the roof main side rail (section without the connection);

FIG. 6 is a schematic cross-sectional view of an auxiliary edge beam;

FIG. 7 is a schematic view of the assembly welding of the secondary side rail to the roof main side rail base;

FIG. 8 is a schematic view of the secondary side rail to roof main side rail interface;

FIG. 9 is a schematic view of the connection of the roof main side rail to the low crown;

FIG. 10 is a schematic view of the connection of the low dome section to the high dome;

FIG. 11 is a schematic plan view of a doorway structure in a passenger compartment;

fig. 12 is a perspective view of the door opening structure of the passenger compartment.

In the figure: the roof comprises a roof 1, a low roof 1a, a high roof 1b, a roof main side rail 11, a connecting part 11a, a base body 11b, a C-shaped section 111, an inner side connecting rib 112, an outer side connecting rib 113, a connecting transverse rib 114, a rain eaves 115, a connecting joint I116, a vertical rib I116 a, an inner side vertical rib 117, an outer side vertical rib 118, a low arc top 12, a connecting joint II 121, a vertical rib II 121a, a high arc top 13, an auxiliary side rail 14, a C-shaped section II 141, an inner side connecting rib II 142, an outer side connecting rib II 143, a connecting transverse rib 144, a diagonal rib 145, a connecting joint III 146, an inner rib 147, a partition wall 15, an F-shaped joint 15a, an L-shaped joint 15b, a connecting plate 16, a side wall 2, a door pillar 21, a cab framework 3, an underframe 4, a passenger room air conditioning unit 5, a welding gun 6 and a door 7;

weld joints 112w, 113w, 142w, 143 w;

weld seams w1, w2, w3, w 4.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

The structure of the rail vehicle is shown in fig. 1 (schematic diagram of the structure of the head vehicle body) and fig. 2 (schematic diagram of the structure of the middle vehicle body): the rail vehicle mainly comprises a roof 1, side walls 2, a cab framework 3, an underframe 4 and a passenger room air conditioning unit 5, wherein the roof 1 of a head vehicle comprises a low roof 1a and a high roof 1b, the high roof 1b is positioned between the cab framework 3 and the passenger room air conditioning unit 5, the high roof 1b is positioned at the front part of a vehicle body, the rest parts are the low roofs 1a, a middle vehicle does not comprise the cab framework 3, and the roofs 1 are all the low roofs 1 a.

Fig. 3 is a schematic sectional view of a vehicle body, a low roof 1a mainly includes a roof main side rail 11 and a low arc roof 12 (an example of a first roof), a high roof 1b mainly includes a roof main side rail 11, an auxiliary side rail 14 and a high arc roof 13 (an example of a second roof), and the connection modes of the lower parts of the low roof 1a and the high roof 1b and the side wall 2 are consistent, so that the structures of the side wall 2 and the bottom frame 4 are kept modularized.

The outer contour of the passenger room air conditioning unit 5 is basically consistent with that of the high car roof 1b, and the outer surface of the car roof is kept smooth and continuous.

Fig. 4 is a first cross-sectional view (section with a connecting portion) of the roof main side rail. The roof main side rail 11 comprises a connecting portion 11a and a base body 11b, the inner sides of the connecting portion 11a and the base body 11b are both provided with a C-shaped profile 111, the portion, close to the connecting portion 11a, of the base body 11b is provided with a connecting transverse rib 114, the connecting portion 11a is located on the upper portion of the connecting transverse rib 114, an inner connecting rib 112 is arranged inside a cavity of the connecting portion 11a, an outer connecting rib 113 is arranged on the outer side of the cavity, and a first connecting joint 116 used for connecting the low arc top 12 is arranged at the top of the end. The base body is also provided with a rain eave 115 positioned at the outer side and used for processing a piece of inner vertical rib 117, two pieces of outer vertical ribs 118 and other rib plates of the upper door corner; the base body 11b has a through-length structure in the longitudinal direction. The eaves 115 are located outside both the connecting portion 11a and the auxiliary side member 14.

Fig. 5 is a schematic second cross-sectional view of the roof main side rail (section without the connecting portion). After a part of the connecting part 11a of the section bar with the through-length structure comprising the connecting part 11a and the base body 11b is milled by machining, the remaining part in the cross-sectional view is the base body 11b, a welding joint 112w is machined at the position of the inner connecting rib 112, a welding joint 113w is machined at the outer side of the outer connecting rib 113, and the welding joint 112w and the welding joint 113w are respectively positioned at two ends of the connecting transverse rib 114. The welded joint 113w is spaced from the top of the eaves 115.

Fig. 6 is a schematic view of an auxiliary edge beam. The auxiliary side beam 14 comprises a C-shaped section II 141, an inner side connecting rib II 142, an inner rib 147, an outer side connecting rib II 143, a connecting transverse rib 144, an inclined rib 145 connected with the C-shaped section II 141 and a connecting joint III 146 located at the top and used for connecting the high arc top 13, wherein the inner side connecting rib II 142, the inner rib 147 and the connecting transverse rib 144 are triangular. And the extending parts of the second outer connecting rib 143 and the second connecting rib 144 are respectively provided with a welded joint 142w and a welded joint 143w at the inner side and the outer side of the second connecting rib 144, and the welded joints 142w and the welded joints 143w are respectively positioned at two ends of the second connecting rib 114.

The roof side rails comprise a roof main side rail 11 and an auxiliary side rail 14; in the longitudinal direction, the partial base body 11b is provided with the auxiliary side beam 14, the partial base body 11b is provided with the connecting part 11a, and the part provided with the auxiliary side beam 14 has no connecting part 11 a.

FIG. 7 is a schematic view of the assembly welding of the secondary side rail to the roof main side rail base. The weld joints 142w and 143w of the auxiliary side member 14 are butt-joined to the weld joints 112w and 113w of the lower base 11b of the roof main side member 11, respectively, and are joined by the welding gun 6 to form a weld w1 and a weld w2 on the inner and outer sides, respectively. And the welding seam w1 and the welding seam w2 are internally provided with a connecting transverse rib 144 for supporting the auxiliary side beam 14, and are internally provided with connecting transverse ribs 114 for supporting the base body 11b, so that the welding seam w1 and the welding seam w2 can well resist welding heat deformation in the welding process.

In addition, by adjusting the groove shapes of the welding line w2 and the welding line w1 and selecting the distribution positions of the welding lines, the second C-shaped profile 141 and the rain eaves 115 have enough space to ensure normal welding when the welding line w2 and the welding line w1 are welded by the welding gun 6 respectively.

FIG. 8 is a schematic view of the secondary side rail to roof main side rail interface. After the auxiliary side rail 14 is assembled and welded with the base body 11b of the roof main side rail 11, the C-shaped section 141 of the auxiliary side rail is overlapped with the C-shaped section 111 of the connecting part 11a of the roof main side rail 11 on the cross section (namely, the C-shaped section of the connecting part and the C-shaped section of the auxiliary side rail are overlapped with each other when viewed along the longitudinal direction), so that the passenger compartment door installation interface of the high roof 1b is kept consistent with the area of the low roof 1 a.

The second inner connecting rib 142 of the auxiliary side beam 14 is overlapped with the inner connecting rib 112 of the connecting part 11a on the cross section, and the inner rib 147 thereof can be overlapped with the outer connecting rib 113 of the connecting part 11a on the cross section, so that the structural continuity of the connecting part between the auxiliary side beam 14 and the connecting part 11a is ensured, and the connecting strength of the two is ensured.

Fig. 9 is a connecting structure of the roof main side rail and the low dome. The connecting part 11a of the roof main side rail 11 and the connecting part 121 of the second connecting joint in the low arc top 12 are provided with a first stud 116a and a second stud 121a, the root parts of a welding line w3 and a welding line w4 are respectively aligned to the first stud 116a and the second stud 121a, and welding thermal deformation can be well resisted in the welding process.

Fig. 10 shows a connection structure of a low dome section and a high dome. The low crown 12 and the high crown 13 are connected by a partition wall 15, an F-shaped joint 15a is arranged at the upper end of the partition wall, and an L-shaped joint 15b is arranged at the lower end of the partition wall. The F-shaped joints 15a are connected to the upper and lower surfaces of the high domes 13 to maintain a certain adjustment amount in the longitudinal direction when the vehicle roof 1 is manufactured. The connecting plate 16 and the L-shaped joint 15b are respectively connected with the upper surface and the lower surface of the low arc top 12, the connecting plate 16 and the L-shaped joint 15b are fixedly welded, and the connecting plate 16 is of a movable structure, so that the roof 1 keeps a certain adjustment amount in the vertical direction during manufacturing.

Fig. 11 and 12 are schematic views of the door opening structure of the passenger compartment. The lower end of the base body 11b of the roof main side rail 11 is connected to the upper end of the door pillar 21, and a part of the base body 11b is removed by machining to form an arc-shaped door corner. Since the roof side rail 11 and the door pillar 21 are aligned at the door corner, the inner side of the door pillar 21 transmits the vertical force and the lateral force to the inner stud 117 of the roof side rail 11, and the stress concentration phenomenon is serious, so the radius R1 processed by the inner stud 117 of the roof side rail 11 is slightly smaller than the radius R2 processed by the outer stud 118, for example, the radius R1 is set to 50-70mm, and the radius R2 is set to 100 mm. Thus, the stress of the inner stud 117 can be appropriately transferred to the outer stud 118, the stress distribution state in the door corner region can be made more uniform, and the safety margin of the vehicle body weak portion can be improved. Meanwhile, the movement space of the swing arm mechanism of the sliding plug door can be ensured, and the base body 11b of the roof main side beam 11 is arranged in a through length mode, so that the door corner structure of each passenger room can be kept consistent.

The embodiments of the present invention are described above with reference to the drawings, and the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A roof side rail, characterized in that: comprises a roof main boundary beam and an auxiliary boundary beam; the roof main side beam is of an integral structure and comprises a base body and a connecting part, the lower end of the base body is used for connecting a side wall of a vehicle body, the connecting part is used for connecting a first roof, and the base body is of a full-length structure in the longitudinal direction; the lower end of the auxiliary edge beam is welded and fixed with the base body, and the upper end of the auxiliary edge beam is used for connecting a second roof; in the longitudinal direction, part of the base body is correspondingly provided with the auxiliary edge beam, part of the base body is correspondingly provided with the connecting part, and the part provided with the auxiliary edge beam is not provided with the connecting part; the second roof is higher than the first roof.

2. The roof side rail of claim 1, wherein the roof main side rail and the roof auxiliary side rail are both profiles, and the roof side rail is processed in a manner that: and obtaining a base body and a connecting part with a full-length structure through extrusion, then removing part of the connecting part in a machining mode to form a roof main side beam, and welding and fixing the auxiliary side beam at the position where the connecting part is removed.

3. The roof side rail according to claim 1 or 2, wherein the auxiliary side rail is located at a front portion of the vehicle body in comparison with the connecting portion in the longitudinal direction.

4. A roof side rail according to claim 1 or 2, characterised in that the inner side of the connecting portion is provided with a C-profile and the inner side of the auxiliary side rail is also provided with a C-profile, the C-profile of the connecting portion and the C-profile of the auxiliary side rail coinciding with each other, seen in the longitudinal direction.

5. A roof side rail according to claim 1 or 2, wherein the base body has a rain eaves, the rain eaves being located both outside the connecting portion and outside the auxiliary side rail.

6. The roof side rail of claim 2, wherein the upper portion of the base body has a connecting cross bar, the connecting portion has an inner connecting bar and an outer connecting bar, and the inner connecting bar and the outer connecting bar are respectively located on both sides of the connecting cross bar; after the connecting part is removed in a machining mode, welding joints are arranged at two ends of the connecting transverse rib; and the auxiliary boundary beam is welded and fixed with the welding joint.

7. The roof side rail of claim 6, wherein the auxiliary side rail has a triangular inner connecting rib, an inner rib and a connecting cross rib, and both ends of the connecting cross rib of the auxiliary side rail are provided with welding joints for welding the base body; and observe along longitudinal direction, the inboard splice bar of connecting portion with the inboard splice bar of supplementary boundary beam coincides each other, the outside splice bar of connecting portion with the interior muscle of supplementary boundary beam coincides each other.

8. A roof comprising a roof side rail as claimed in any one of claims 1 to 7, and wherein the first roof is a low crown and the second roof is a high crown; the first roof and the second roof are connected by adopting a partition wall, the upper end of the partition wall is provided with an F-shaped joint, and the lower end of the partition wall is provided with an L-shaped joint; the F-shaped joint is connected with the upper surface and the lower surface of the second roof, and the L-shaped joint is connected with the lower surface of the first roof.

9. A railway vehicle comprising the roof side rail according to any one of claims 1 to 7, wherein a lower end of a base body of the roof side rail is connected to an upper end of a door pillar, and a portion of the base body is removed by machining to form an arc-shaped corner.

10. The railway vehicle as claimed in claim 9, wherein the lower end of the base has an inboard stud and an outboard stud, the inboard stud having a radius R1 smaller than a radius R2 of the outboard stud at the curved door corner.

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