JP2515802Y2 - Mobile shelter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a mobile shelter. That is, the present invention relates to a mobile shelter that accommodates equipment and the like, is loaded on a vehicle or the like, is moved, and is used at a destination.

"Technical background" Such a mobile shelter is subject to the regulations of the Road Traffic Act and other regulations when moving on a vehicle on a truck bed or the like, and its size, that is, its width, length, height and the like are restricted. Due to such restrictions, the space for housing equipment and the like, and the working space and living space for operation, adjustment, inspection, etc. of the equipment during installation and use are narrow inside,
It was often difficult to secure them.

Therefore, first of all, a movable shelter having a folding / expanding structure has been developed and used. In other words, when the mobile shelter is mounted on the vehicle, the enlarged portion is folded and stored in the main body to reduce the size, thereby satisfying the restrictions of the law. As a result, a work space, a living space and the like were secured in the center of the interior. However, such folding
The mobile shelter with the unfolding structure is complicated in the folding and storing work and the unfolding and assembling work, and it takes time and labor to reduce and expand the size.
In addition, due to the folding and unfolding structure, the hermeticity was poor, and the waterproof, airtight, and heat insulating properties were difficult, and the adverse effects on the equipment housed were also seen.

Therefore, conventionally, a nested mobile shelter has been developed and used. FIG. 3 is a perspective view of a movable shelter of this type of a conventional example in a state where the drawer is enlarged.

In other words, in this movable shelter having a nested structure, the expanding portion 1 is pushed into the main body portion 2 from the side direction S and stored when the vehicle is moved to the contracted state, which satisfies the restriction of the regulation, and when it is installed and used, it is enlarged as shown in the drawing. The part 1 is pulled out from the main body part 2 in the lateral direction S and is in an expanded state, so that a working space, a living space and the like are secured in the central part of the inside. Moreover, since the movable shelter is of a nested type, it is easy to push in and pull out the expanding portion 1 and it does not require time and effort to reduce and expand the size. Also, it has a good sealing property and is excellent in waterproofness, airtightness, heat insulation, etc. The drawbacks of the movable shelter having the above-mentioned folding and unfolding structure have been solved at the same time. In the movable shelter having such a nesting structure, the rail portion 4 protruding from the lower portion of the side wall 3 of the enlarged portion 1 is provided with the guide portion 6 provided at an appropriate position below the floor portion 5 of the main body portion 2. It was designed to slide in and out while being held by.

"Prior Art" By the way, in such a movable shelter having a nested structure, if the floor is fixedly provided on the lower surface of the enlarged portion 1, the following problems occur. That is, there is a step between the floor upper surface of the enlarged portion 1 and the upper surface of the floor portion 5 of the main body portion 2 that are in the drawer enlarged state during installation and use, and the work is difficult to perform inside, and there is a difficulty in workability. Further, if there is a device or the like housed on the upper surface of the floor 5 of the main body 2, there is also a difficulty in that the expanded portion 1 cannot be pushed into the main body 2 to be housed and brought into a contracted state.

Therefore, in the nested mobile shelter,
As in the conventional example shown in the figure, a structure provided with a falling floor A has been generally used conventionally. That is, the lower surface of the enlarged portion 1 is opened, and the dropped floor A is provided on the enlarged portion 1 by pivoting or the like, and the dropped floor A is placed directly on the strength upper rail portion 4 to be supported in the pulled-out enlarged state of the enlarged portion 1. Therefore, the floor of the enlarged portion 1 is generally used. Therefore, by such a conventional example, it has been attempted to solve the problems such as the above-mentioned step difference in the enlarged drawing state. Note that FIG. 3 shows a state in which the falling floor A is still folded in the retracted position in the expanded state.

By the way, in such a movable shelter, doors 8 are provided on the front and rear wall portions 7 of the main body portion 2 in order to move in and out. However, the door 8 of the main body portion 2 becomes unusable in the retracted state because the front and rear walls 9 of the enlarged portion 1 interfere with the door 8. Therefore, a door 10 is also provided on the side wall 3 of the enlarged portion 1 so as not to hinder the entrance and exit even in such a housed and contracted state, and in the housed and contracted state, the door 10 exclusively enters and exits.

In response to this, the falling floor A has conventionally been divided into two as shown in the figure. That is, the first falling floor B having a length l ₁ in the longitudinal direction excluding a portion substantially corresponding to the door 10 is pivotally attached to the lower side of the side wall 3 of the enlarged portion 1 and substantially corresponds to the door 10. A second falling floor C having a length l ₂ in the longitudinal direction was pivotally attached to the lower side of the front and rear walls 9 of the enlarged portion 1. Therefore, when the expanded portion 1 is in the expanded state, the first part of the falling floor A is
Both the falling floor B and the second falling floor C are pivoted downward to be supported on the rail portion 4 and function as the floor of the open lower surface of the enlarged portion 1. On the other hand, in the retracted state of the expansion portion 1, the falling floor A, that is, the first falling floor B and the second falling floor C are rotated upward toward the side wall 3 and the front-rear wall 9 side of the expansion portion 1, respectively. As it was, it was folded to the retracted position so that the door 10 would not be blocked and there would be no obstruction to access from the door 10.

[Problems to be Solved by the Invention] By the way, the following problems have been pointed out in such a conventional movable shelter having a falling floor A.

Firstly, there is a problem in that the first falling floor B and the second falling floor C are separately attached to the expansion section 1 and a step is formed on the falling floor A. That is, the lower portion of the side wall 3 of the enlarged portion 1 extends further downward than the floor portion 5 of the main body portion 2, while the front and rear walls 9 of the enlarged portion 1 are pushed into the main body portion 2 for storage. It never extends below the floor 5 of the part 2. Therefore, while the expanded portion 1 is pulled out and expanded, the first dropped floor B can be pivotally attached to the side wall 3 so that no step is formed on the upper surface of the floor 5 of the main body 2.
It was difficult for the second falling floor C to be pivotally attached to the front and rear walls 9 as such. Thus, in order to eliminate the step between the upper surface of the second falling floor C that functions as the floor of the enlarged portion 1 and the upper surface of the floor portion 5 of the main body portion 2, the second falling floor C may be pivotally attached via a spacer. However, in any case, the second falling floor C
It is not easy because a step is likely to occur between the floor portion 5 of the main body portion 2 and the first falling floor B, and the avoidance thereof requires accurate spacers.

Secondly, there is also a problem that rain wind and the like enter from the pivotally attached portion of the second falling floor C. That is, since the second falling floor C and the front and rear walls 9 of the enlarged portion 1 are pivotally attached by a hinge or the like, and in the extended state of extension, they form a right angle and the pivotal attachment portion is located at the corner. It was easy for rain and wind to enter the interior through the gaps at such pivot points.

 Such a point has been pointed out in the conventional example.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances to solve the problems of the above-described conventional example, in which the second falling floor is pivotally attached to the first falling floor pivotally attached to the side wall of the enlarged portion. By so doing, it is an object of the present invention to propose a movable shelter that firstly prevents a step from occurring and secondly prevents rain and wind from entering in the extended state of drawer.

"Means for solving the problem" The technical means of the present invention for achieving this object are as follows.

The mobile shelter accommodates equipment and the like, is loaded on a vehicle or the like, and is moved to form a box. Then, a main body portion having an opening on a side surface, and a movable body is telescopically assembled to the main body portion through the opening, and is pushed into the main body portion to be stored and reduced, and withdrawn and enlarged. Part, the following guide part, rail part, door, falling floor, etc.

A plurality of guide portions are provided laterally at appropriate positions under the floor of the main body portion. A plurality of rail portions are provided below the side wall of the enlarged portion, project toward the main body portion, are held by the guide portion, and can be slid in and out.

The door is provided at one end of the side wall of the enlarged portion. The fallen floor is a floor of the enlarged portion whose lower surface is opened in the extended state of pulling out and is divided into a first fallen floor and a second fallen floor. First, the base of the first falling floor is pivotally attached to the side wall lower side of the enlarged portion, is supported on the rail portion in the extended state of being pulled out of the enlarged portion, and has the same width as the width of the enlarged portion. The length of the enlarged portion in the longitudinal direction excluding a portion substantially corresponding to the door is provided.

A base end of the second falling floor is pivotally attached to the door-side end edge of the first falling floor, and the second falling floor is located between the side wall and the first falling floor in the retracted state of the expanding portion, and The width is substantially the same as the width, and the length in the longitudinal direction substantially corresponding to the door of the enlarged portion is provided.

[Operation] The present invention is constituted by such means, and operates as follows.

In this mobile shelter in which equipment and the like are accommodated, an enlarged portion is pushed into the main body portion when being moved on a vehicle and is stored and reduced, and when installed and used, the enlarged portion is pulled out from the main body portion and enlarged. Such reduction and enlargement is performed by sliding the rail portions on the enlargement portion side into and out while being held by the corresponding guide portions on the main body portion side.

This mobile shelter is equipped with a falling floor in the expansion section.The falling floor can be rotated to the retracted position in the retracted position when the vehicle is moved, etc., and can be rotated from the retracted position in the expanded state when installed or used. It is moved to act as a floor for the enlarged section with the lower surface open. The falling floor is divided into a first falling floor and a second falling floor, and the second falling floor is pivotally attached to the first falling floor pivotally attached to the side wall of the enlarged portion.

Therefore, firstly, in the drawing-out and expansion state of the expansion section, first the first falling floor is rotated from the retracted position, and then the second falling floor is rotated from the first falling floor to function as respective floors. Since the first falling floor and the second falling floor are connected in this way, the second falling floor is easily flush with the floor of the main body and the first falling floor, and no step is formed.

Secondly, in the extended state of the drawer, the first falling floor and the second falling floor are flush with each other, so that the mutual pivot points can be easily closed, and the second falling floor and the expanded portion can be easily closed. Since the front and rear walls are not pivotally attached to each other, they can be easily sealed with other members such as a receiving member. As a result, gaps are less likely to occur, and infiltration of rain and wind is prevented.

Third, of course, in the retracted state of the expanded portion, the second
The fallen floor is in a retracted position between the side wall of the enlarged portion and the first fallen floor. Therefore, the door provided on the side wall is not closed, and the entrance and exit can be performed without any trouble.

[Embodiment] The present invention will be described in detail below based on the embodiment shown in the drawings.

1 and 2 are perspective views showing an enlarged state of the drawer according to the embodiment of the present invention, FIG. 1 shows a state in which the falling floor D is still folded and in the retracted position, and FIG. 2 shows a falling floor. The state where D is functioning as the floor of the enlarged portion 1 is shown.

First, the configuration and the like will be described in order of the outline of the movable shelter, the main body portion 2, the enlarged portion 1, the falling floor D, and the like.

 The outline of the mobile shelter is as follows.

The mobile shelter accommodates equipment and the like, is loaded on a vehicle or the like, and is moved to form a box. That is, this mobile shelter houses electronic equipment such as radar equipment and wireless communication equipment and other equipment and equipment inside, and is loaded on a carrier of a car such as a truck, a railway car or other transportation means, and reaches a destination. It is transported and installed at the destination.

The movable shelter has a telescopic nesting structure, and has a main body 2 having an opening 11 on a side surface, and an expansion portion 1 movably assembled to the main body 2 through the opening 11 in a telescopic manner. I will do it. In the illustrated example, the openings 11 are formed on both side surfaces of the main body 2 and the left and right enlarged portions 1 are assembled to each of them. The opening 11 is formed only on one side surface and the other side is a wall, and the opening on one side is formed.
A mobile shelter in which one expansion unit 1 is attached to 11 is also possible.

 The mobile shelter is roughly like this.

 Next, the main body 2 will be described.

In the illustrated example, the main body portion 2 has a box-like shape in which both opposite side surfaces are opened as openings 11 and includes a floor portion 5, a ceiling portion 12 and front and rear wall portions 7, which are, for example, made of metal and are orthogonal to each other. It is configured by assembling the honeycomb sandwich panel as a wall to the frame frame. Body 2
The width in the side direction S is set to a size that can be loaded on the bed of a truck, for example. Reference numeral 8 denotes an entrance / exit door attached to the front and rear wall portions 7.

A plurality of guide portions 6 are provided at an appropriate position below the floor portion 5 of the main body portion 2 over substantially the entire width in the lateral direction S, and an under roller (not shown) is attached to the lower side end of the guide portion 6. There is. That is, the guide portion 6 is, for example, in the shape of a rectangular tube or a square pipe whose both ends are open, has a length substantially the same as the width of the floor portion 5, and is fixed in the lateral direction S at an appropriate position below the floor portion 5. There is. The number, position, etc. of the guide portions 6 can be various. Further, instead of one rail portion 4 being taken in and out as described later, the size and the like in which two rail portions 4 are put in and out side by side are set. It is also possible.

 The main body 2 is configured as described above.

 Next, the enlargement unit 1 will be described.

The expansion part 1 is pushed in with respect to the main body part 2, accommodated therein, contracted, and pulled out to be expanded.
It is assembled on both left and right sides of the main body 2 through both openings 11, and the size thereof is almost the same on the left and right and is about half that of the main body 2.

That is, the left and right enlarged portions 1 are formed as an inner box with the body portion 2 as an outer box, an inner side surface corresponding to the opening 11 of the body portion 2 is opened as an opening 13, and an outer side surface facing the opening 13 is formed. Each has a side wall 3, and further has a box shape with a ceiling 14, front and rear walls 9, and the like. The lower surface of the enlarged portion 1, that is, the floor surface is open. Like the main body 2 described above, these are also configured by assembling, for example, a honeycomb sandwich panel as a wall in a frame frame made of metal and orthogonal to each other. As shown in the figure, the left and right enlarged portions 1 each have a width in the side direction S of about half of the width of the main body 2, a length in the longitudinal direction slightly shorter than the main body 2, and a height slightly higher than the main body 2. It is formed low, so that its size, volume, and shape are almost the same on the left and right, and are about half of the main body 2.

By the way, a door 10 is provided on one side of the side wall 3 of the enlarged portion 1 as described above.
And a rail portion 4 is provided below the side wall 3. That is, the lower end portions of the side walls 3 of the left and right enlarged portions 1 extend further below the floor portion 5 of the main body portion 2 and are located at the same height level as the guide portions 6 below the floor portion 5. Then, the base end of each rail portion 4 is fixed to the lower end portion of the side wall 3, each rail portion 4 projects toward the corresponding guide portion 6 of the main body portion 2, and the length thereof is, for example, the lateral direction S of the main body portion 2. The width is almost the same, and the left and right counterparts are staggered with each other. The number, position, and the like of such rails 4 can be variously similar to the above-described guides 6.

In such a rail portion 4, rail rollers (not shown) are attached to the ends of the rail portion 4 on the side of the main body portion 2 by horizontal rotating shafts. Therefore, the rail portion 4 is held by the corresponding guide portion 6 via the under roller on the guide portion 6 side and the rail roller on the rail portion 4 side, and can be slid into and out of the guide portion 6.

 The enlargement unit 1 is configured as described above.

 Next, the falling floor D and the like will be described.

The falling floor D serves as a floor of the enlarged portion 1 whose lower surface is opened in the drawer expanded state, and is divided into two parts, that is, a first falling floor E and a second falling floor F each having a flat plate shape. When the first dropped floor E and the second dropped floor F are combined, the size of the open floor of the enlarged portion 1 is matched.

First, the base of the first falling floor E is pivotally attached to the lower side of the side wall 3 of the expanding portion 1 by a hinge or the like with a horizontal rotating shaft via a mounting edge portion or the like, and the rail is in the drawn-out expanded state of the expanding portion 1. Part 4
Supported above. Moreover, the first falling floor E has a width l ₃ that is substantially the same as the width of the enlarged portion 1, that is, the width of the main body portion 2 along the lateral direction S, and the length excluding the portion of the enlarged portion 1 that substantially corresponds to the door 10. Direction, that is, the length l ₁ in the longitudinal direction orthogonal to the lateral direction S,
Be prepared. That is, the first falling floor E is folded upward to lean against the side wall 3 and is folded in the retracted position in a vertical posture substantially parallel to the side wall 3 and the like (see FIG. 1). It is pivoted downward from and is supported by the rail portion 4 in parallel with it, and is pivotable to a position in which it is the floor of the enlarged portion 1 in the horizontal posture (see FIG. 2).

Further, the second falling floor F is pivotally attached to the end edge of the first falling floor E on the door 10 side by a hinge or the like, and when the expanded portion 1 is in the retracted state, it is between the side wall 3 and the first falling floor E. To position. Further, the second falling floor F has a width l ₃ which is substantially the same as the width of the enlarged portion 1 and a length l ₂ in the longitudinal direction which substantially corresponds to the door 10 of the enlarged portion 1. That is, the second dropped floor F is rotated to the first dropped floor E side and folded, and then the first dropped floor E is folded to the retracted position in the vertical posture, so that the second dropped floor F is at the retracted position together with the side wall 3
And a state in which it is located between the first dropped floors E (see FIG. 1), and a position where the first dropped floors E are turned downward together with the first dropped floors E from this state and the first dropped floor E becomes the floor of the enlarged portion 1 in the horizontal posture. Then, the second dropped floor F itself can be displaced further to a state in which the second dropped floor F itself becomes the floor of the enlarged portion 1 in a horizontal posture at a position substantially corresponding to the door 10.

 The falling floor D and the like are like this.

 The above is the description of the configuration and the like.

 The operation and the like will be described below.

The mobile shelter in which electronic devices and other devices are housed is mounted on the main body 2 by pushing the left and right enlarged portions 1 into the main body 2 through the opening 11 in the lateral direction S when the vehicle is moved by a truck or the like. It is stored and reduced. On the other hand, when installed and used at the destination, the enlarged portion 1 is pulled out in the lateral direction S from the main body portion 2 through the opening 11, and the inside is widely opened and enlarged through the opening 11 and the opening 13 (see FIG. 1). , The state shown in FIG. 2).

The reduction and enlargement of the enlarged portion 1 is performed by sliding each rail portion 4 on the enlarged portion 1 side into and out of the corresponding guide portion 6 on the main body portion 2 side while holding it vertically. . In addition, since the left and right rail portions 4 are alternately shifted, the rail portions 4 are inserted into the opposed guide portions 6 without any trouble even in a reduced state.

Now, this movable shelter is provided with a falling floor D in the enlarged portion 1, and this falling floor D is rotated to an upper vertical retreat position in a retracted storage state such as when moving onboard (see FIG. 1). ) In addition, in the extended state of drawer such as installation and use, first, from such a retracted position (see FIG. 1), it is pivoted downward to assume a horizontal posture and supported on the rail portion 4,
It functions as the floor of the enlarged portion 1 whose lower surface is open (see FIG. 2).

By the way, the falling floor D is divided into a first falling floor E and a second falling floor F, and the second falling floor F is pivotally attached to the first falling floor E pivotally attached to the side wall 3 of the enlarged portion 1. It will be done. Therefore, the falling floor D first takes the next retracted position. That is,
After the second dropped floor F is rotated to the first dropped floor E side to be folded, the first dropped floor E is rotated upward together with the second dropped floor F, so that the first dropped floor E becomes the second dropped floor E. It is folded to a retracted position in a vertical posture, such as leaning against the side wall 3 of the enlarged portion 1 via the falling floor F (see FIG. 1). Further, the falling floor D functions as the floor of the expansion section 1 as follows. That is, the first dropped floor E is pivoted downward together with the second dropped floor F from such a retracted position, and the first dropped floor E is supported in parallel on the rail portion 4 and is supported in a horizontal position. Becomes At the same time, by further rotating the second dropped floor F from the first dropped floor E, the second dropped floor F also becomes the floor of the enlarged portion 1 in a horizontal posture at a position substantially corresponding to the door 10.

Now, this fallen bed D becomes the following 1st, 2nd, and 3rd.

Firstly, when the expansion section 1 is in the expanded state, first the first drop floor E is rotated from the retracted position, and then the first dropped floor E is rotated.
The second dropped floor F is rotated from the dropped floor E to function as a floor. Thus, the first falling floor E and the second falling floor F
Since the and are connected, the upper surface of the floor 5 of the main body 2 and the upper surface of the first falling floor E are easily flush with the upper surface of the second falling floor F, and no step is formed. In other words, unlike the conventional example, the first falling floor E and the second falling floor F are not separately attached to the enlarged portion 1, but both are integrally attached to the enlarged portion 1, so a step is unlikely to occur.

Secondly, in the drawer expanded state, the first falling floor E and the second falling floor F are flush with each other,
Mutual pivot points are easily blocked. Further, since the second falling floor F and the front and rear walls 9 of the enlarged portion 1 are not pivotally attached, they can be easily closed. Further, in the extended state of the drawer, the second falling floor F and the floor portion 5 of the main body portion 2 are flush with each other, the first falling floor E and the floor portion 5 are flush with each other, and the other members are easily sealed. To be done. As a result, no gaps are created and rain and wind are prevented from entering.

Thirdly, of course, when the expansion section 1 is in the retracted state, the second falling floor F is in the retracted position between the side wall 3 of the expansion section 1 and the first falling floor E. Therefore, the door 10 provided on the side wall 3 of the enlarged portion 1
Is not blocked, and entrance and exit through the door 10 can be done without any problems.

It should be noted that it is conceivable to interpose a sealing material such as rubber in order to ensure the sealing between the respective members described in the above-mentioned second. That is, the pivotal connection points between the above-mentioned members, the locking points,
If a seal material such as rubber is provided at each of the abutting and contacting points, the respective members are more reliably sealed and sealed, and a gap is less likely to occur, and intrusion of rain and wind is completely prevented.

 The above is the description of the operation and the like.

[Advantage of the Invention] As described above, the movable shelter according to the present invention is provided with a second falling floor instead of a second falling floor pivotally attached to the side wall of the enlarged portion.
The following effects are exhibited by pivotally connecting the fallen floor.

In FIG. 1, a step does not occur in the extended drawing state. That is, in the expanded state of pulling out the expanded section during installation and use, the second dropped floor is easily flush with the floor of the main body and the first dropped floor, and no step is generated.
Workability inside is also improved.

Secondly, the entry of rain and wind is also prevented. That is, since the first falling floor and the second falling floor, between the second falling floor and the front and rear walls, and other members are easily closed and a gap is less likely to occur in the drawer expanded state of the expanding portion during installation and use, Infiltration of rain and wind is reliably prevented.

In this way, the problems existing in this type of conventional example are eliminated, and the effects of the present invention are remarkable and significant.

[Brief description of drawings]

FIG. 1 and FIG. 2 are perspective views of a movable shelter according to an embodiment of the present invention in a drawer enlarged state, and FIG.
Show the state that the fallen floor is still folded to the retracted position,
FIG. 2 shows a state in which the fallen floor functions as the floor of the enlarged portion. FIG. 3 is a perspective view of a movable shelter according to a conventional example in an extended state of drawing, and shows a state in which the falling floor is still folded to the retracted position. 1 ... Enlarged part, A ... Falling floor 2 ... Main body part, B ... First falling floor 3 ... Side wall, C ... Second falling floor 4 ... Rail part, D ... Falling floor 5 ... Floor, E …… First falling floor 6 …… Guide, F …… Second falling floor 7 …… Front and rear walls, S …… Side direction 8 …… Door, l ₁ …… Length 9 …… Front and back Wall, l ₂ …… length 10 …… door, l ₃ …… width 11 …… opening 12 …… ceiling 13 …… opening 14 …… ceiling

Claims (1)

(57) [Scope of utility model registration request] 1. A box-shaped movable shelter for accommodating equipment and the like, which is loaded on a vehicle or the like and moved, and a main body portion having an opening on a side surface, and a nestable type in the main body portion through the opening. An enlarged portion that is movably assembled, is pushed into the main body portion, is stored and contracted, and is pulled out and enlarged; and a plurality of guide portions that are provided laterally at appropriate positions below the floor portion of the main body portion, A plurality of rail portions that project toward the main body portion provided at the lower portion of the side wall of the enlarged portion and that are held by the guide portion and that can be slid in and out; and a door provided at one end portion of the side wall of the enlarged portion. A falling floor which is the floor of the enlarged portion with the lower surface opened in the drawer expanded state, and the falling floor is divided into a first falling floor and a second falling floor, and the first falling floor is , The base end on the lower side of the side wall of the enlarged portion It is pivotally attached and is supported on the rail portion in the expanded state of the expanded portion being pulled out, and has a width substantially the same as the width of the expanded portion and a length in the longitudinal direction excluding a portion of the expanded portion substantially corresponding to the door. A base end of the second dropped floor is pivotally attached to the door-side end edge of the first dropped floor, and the second dropped floor is located between the side wall and the first dropped floor in the retracted state of the enlarged portion, and A movable shelter having a width substantially the same as the width of the enlarged portion and a length in the longitudinal direction substantially corresponding to the door of the enlarged portion.