JP2015034438A - Design method of four-stage spiral stairway - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a design method of a four-stage spiral stairway, adapted to a Building Standard Act, and easy in design.SOLUTION: While keeping an inclination of stir-nosing 11 of a first spiral footboard 10 in a virtual XY plane, a virtual Y section 12 of the stair-nosing 11 of the first spiral footboard 10 is changed until a spiral footboard dimension S of the first spiral footboard 10 becomes a legal value or more, and while keeping an inclination of stair-nosing 21 of a second spiral footboard 20 in the virtual XY plane, a virtual Y section 22 of the stair-nosing 21 of the second spiral footboard 20 is changed until the spiral footboard dimension S of the second spiral footboard 20 becomes the legal value or more, and while keeping an inclination of stair-nosing 31 of a third spiral footboard 30 in the virtual XY plane, a virtual Y section 32 of the stair-nosing 31 of the third spiral footboard 30 is changed until the spiral footboard dimension S of the third spiral footboard 30 becomes the legal value or more, and while keeping an inclination of stair-nosing 41 of a fourth spiral footboard 40 in the virtual XY plane, a virtual Y section 42 of the stair-nosing 41 of the fourth spiral footboard 40 is changed until the spiral footboard dimension S of the fourth spiral footboard 40 becomes the legal value or more.

Description

  The present invention relates to a four-step staircase in which a 90-degree angle is rotated by four steps.

In urban areas, there are many so-called small houses built on a site area of about 10 square meters (33 square meters). Of course, in these houses, in order to effectively use extremely narrow sites, the majority of cases are two to three stories, and the installation of stairs is essential.
In order to ascend and descend with a small floor area by the stairs, instead of installing a straight stairs that goes straight up to the upper floor, a flat U-shaped folded stairs whose direction changes 180 degrees at the beginning and ascending, It is effective to make a turning stair around the folded portion of a flat L-shaped bent staircase whose direction changes 90 degrees from the beginning to the end.

  In this folded staircase or foldable staircase, there are two-step staircases in which a two-stage triangular stepping board is provided at the 90-degree folded part, or three-step staircases in which three steps are provided in the same part. Mostly used. If a four-step staircase 1 as shown in FIG. 7, which rises four steps in the same space, the floor area occupied by the staircase can be further reduced.

However, regarding the installation of staircases, the stair width, the size of the treads, kicking up, handrails and other standards are strictly defined in the Building Standards Act, of which the effective width of the treads (the size of the treads) is particularly problematic here is there.
As shown in FIG. 8, the size of the tread is connected to the position of the nose 300 mm away from the narrow side of the tread and the position of the nose 300 mm away from the narrow side of the next step. It refers to the length of a straight line, and the legal value is 150 mm or more.
FIG. 8 shows a four-step staircase 1 including a first turnboard 10, a second turnboard 20, a third turntable 30, and a fourth turntable 40.
This 150 mm is a standard provided in order to increase the risk of falling off the foot when climbing, especially when descending, if it is narrower than this.
Hereinafter, the tread board dimension of the surrounding staircase is referred to as a tread board dimension S.

Here, in a general two-step staircase, there is no problem because this stepping plate dimension S can be sufficiently obtained even if no measures are taken. However, a three-step staircase increases the number of steps in the same space. There will be little margin.
Furthermore, in the four-step staircase 1, the number of steps is further increased in the same space, so that it is difficult to secure 150 mm for all the four-step stepboards by the conventional method. It can be seen from FIG. 8 that the tread board dimensions S of all the treads are similarly small, and are all 150 mm or less.

Therefore, basically, the size of the stairs cannot be reduced to easily make the four-step staircase 1, so even a small house usually employs a three-step staircase.
Therefore, the ratio of the floor area of the staircase in a small house becomes larger than that of a general house, which causes the narrow floor area to be further narrowed.

On the other hand, in a small house, there is no particular design margin, and there are cases where it is necessary to reduce the area of the staircase by adopting four-step staircases. The upper reference point is moved to the outside of the staircase, and as shown by the double chain line in FIG. 8, the measurement point of the turning stepboard dimension S is also moved to the outside of the surrounding staircase to increase the distance. A method of adapting to the Building Standards Act is also used.
Further, as another method of reducing the floor area of the stairs, a method of gradually turning around the straight part of the tread and starting to change the direction of the stairs has been proposed (see, for example, Patent Documents 1 and 2). .

JP 2000-204736 A Special table 2003-534474 gazette

  According to the present invention, it is possible to gently go around the corners of the curved staircase, so that the width at the measurement location of the turning step board dimension S tends to be wider than the usual design, and the turning step board dimension S easily satisfies the legal value.

However, the conventional surrounding stairs, particularly around small stairs, have the following problems.
(1) Violation of the Building Standards Law Two-step staircases and three-step staircases conform to the Building Standards Law, but in the case of four-step staircases 1, the normal design method cannot secure the turning step board dimension S150 mm.
(2) The width of the staircase is narrowed. In order to secure the turning plate size S150mm in the four-step staircase 1, the cover thickness is 20-30mm by attaching a cover to the center column C surface and shifting the reference point position. It is necessary to take a degree. In this case, a cover material is separately required, and the staircase width (750 mm or more in the building standard method) is reduced accordingly. Depending on the stairs, even if it is legal to ensure the size of the step board S150mm, the width of the stairs will be 750mm or less, which may violate the Building Standard Law.

(3) The design of the turning step board is complicated As shown in Patent Document 1 and Patent Document 2, the method of starting the direction change of the turning step gradually from the straight portion of the step board, the turning step size S is surely sufficient. However, the design of the stairs is very complicated.
(4) Large area occupied by stairs For the above reasons, even if it is a small house, the majority of the cases are two-step stairs and three-step stairs with four steps. Since the number of steps that can be raised and lowered at the turn-up part of the degree is two or three, if there are extra steps at one or two steps that can be earned at the turn-up part when the four-step staircase 1 is used Don't be.
Therefore, an extra area for this one or two steps (one step for a straight stair tread board is about 240 mm × 900 mm) is required, and the living area is reduced accordingly.

  Accordingly, an object of the present invention is to provide a method for designing a four-step staircase that conforms to the Building Standard Law and is easy to design.

  In order to achieve the above object, the design method for the four-step staircase (1) according to claim 1 of the present invention includes the first turnboard (10), the second turntable (20), and the third turntable. (30) and the height of the fourth turn plate (40) in order, 22.5 degrees of each nose (11, 21, 31, 41) from the reference line (51) parallel to the virtual Y axis In the design method of the four-step staircase (1) in which the step nose (41) of the fourth turn step plate (40) is arranged in parallel with a virtual X axis orthogonal to the virtual Y axis by rotating in turn at respective angles. While the angle between the nose (11) of the first stepping plate (10) and the reference line (51) is maintained at 22.5 degrees, the size of the stepping plate (S) of the first stepping plate (10) is not less than the legal value. Until the nose (11) of the first footboard (10) is separated from the reference line (51) until While the angle formed by the nose (21) of the two-turning step plate (20) and the nosing (11) of the first turning step plate (10) is maintained at 22.5 degrees, the size of the turning step plate of the second turning step plate (20) ( The step nose (21) of the second turn plate (20) is moved away from the step nose (11) of the first turn step plate (10) after the movement until the S) reaches a legal value or more, and the third turn step plate (30 ) And the nose (21) of the second stepping plate (20) are maintained at 22.5 degrees, and the size of the stepping plate (S) of the third stepping plate (30) is determined by the law. The nose (31) of the third turn tread (30) is moved away from the nose (21) of the second turn tread (20) after the movement until the value becomes equal to or greater than the value, and the nose of the fourth turn tread (40) ( 41) and the angle formed by the nose (31) of the third turn plate (30) while keeping the angle at 22.5 degrees, The nose (31) of the third step board (30) after moving the nose (41) of the fourth step board (40) until the size (S) of the four step board (40) is equal to or greater than the legal value. ).

  In addition, the design method of the four-step staircase (1) according to claim 2 includes the first turnboard (10), the second turntable (20), the third turntable (30), and the fourth turntable ( 40) in order, while rotating the respective noses (11, 21, 31, 41) sequentially at an angle of 22.5 degrees from the reference line (51) parallel to the virtual Y axis. In the design method of the four-step staircase (1) in which the step nose (41) of the four-step stepboard (40) is arranged in parallel to the virtual X-axis orthogonal to the virtual Y-axis, When the dimension (S) is smaller than the statutory value, the size of the stepping plate (S) of the first stepping plate (10) is maintained while maintaining the inclination of the nose (11) of the first stepping plate (10) in the virtual XY plane. ) Of the nose (11) of the first footboard (10) until the When the section (12) is changed and the virtual Y section (12) of the nose (11) of the first turn board (10) is moved, the turn board size (S) of the second turn board (20) is changed. If it is smaller than the legal value, while the inclination of the nose (21) of the second turn plate (20) in the virtual XY plane is maintained, the turn step size (S) of the second turn plate (20) is The virtual Y-intercept (22) of the nose (21) of the second turning step board (20) is changed until the legal value becomes equal to or greater than the legal value, and the virtual Y-intercept (22) of the nosing (21) of the second turning step board (20). If the size (S) of the third stepping plate (30) after the movement is smaller than the legal value, the nose (31) of the third stepping plate (30) in the virtual XY plane While maintaining the tilt, the size of the step plate of the third step plate (30) ( ) Is changed to a virtual Y-intercept (32) of the nose (31) of the third stepping plate (30) until it becomes equal to or greater than the legal value, and a virtual Y-intercept of the nose (31) of the third stepping plate (30) is changed. In the case where the turning plate size (S) of the fourth turning plate (40) after moving (32) is smaller than the legal value, the nose of the fourth turning plate (40) in the virtual XY plane ( 41) While maintaining the inclination of 41), the virtual Y-intercept (42) of the nose (41) of the fourth turning plate (40) until the turning step size (S) of the fourth turning plate (40) is equal to or greater than the legal value. ) Is changed.

  In addition, the design method of the four-step staircase (1) according to claim 3 is the first round step plate (10), the second round step plate (20), the third round step plate (30), and the fourth round step plate ( 40) in order, while rotating the respective noses (11, 21, 31, 41) sequentially at an angle of 22.5 degrees from the reference line (51) parallel to the virtual Y axis. In the design method of the four-step staircase (1) in which the step nose (41) of the four-step stepboard (40) is arranged in parallel to the virtual X-axis orthogonal to the virtual Y-axis, the first stepboard (10 ) While maintaining the inclination of the nose (11), the size (S) of the first stepping plate (10) is matched to the legal value, and the virtual Y of the nosing (11) of the first stepping plate (10) is determined. A section (12) is uniquely determined, and the second turn plate (20) in the virtual XY plane While maintaining the inclination of the nosing (21), the size of the stepping plate (S) of the second stepping plate (20) after the virtual Y section (12) of the nosing (11) of the first stepping plate (10) is determined. To the legal value, the virtual Y-intercept (22) of the nose (21) of the second turn plate (20) is uniquely determined, and the nose of the third turn plate (30) in the virtual XY plane ( 31) While maintaining the inclination of 31), the size (S) of the turn plate of the third turn plate (30) after the virtual Y section (22) of the nose (21) of the second turn plate (20) is determined is determined. The virtual Y-intercept (32) of the nose (31) of the third turn plate (30) is uniquely determined in accordance with the legal value, and the nose (41) of the fourth turn plate (40) in the virtual XY plane. The virtual Y of the nose (31) of the third turn plate (30) while maintaining the inclination of A virtual Y-intercept (41) of the nose (41) of the fourth turn plate (40) by making the turn step size (S) of the fourth turn step plate (40) after the piece (32) is determined coincide with the legal value. 42) is uniquely determined.

  Here, the symbols in the parentheses indicate corresponding elements or corresponding matters described in the drawings and the embodiments for carrying out the invention described later.

According to the design method of the four-step staircase of the first aspect of the present invention, the size of the stepping plate of the first stepping plate is maintained while maintaining the angle between the nose of the first stepping plate and the reference line at 22.5 degrees. Since the nose of the first step board is separated from the reference line until it exceeds the legal value, the following effects are obtained.
The same applies to the second turn plate, the third turn plate, and the fourth turn plate.
(1) It does not violate the Building Standard Law. The size of the first tread plate to the fourth tread plate can be surely set to the legal value or more.
By assembling the first turn plate and the like while faithfully following the procedure disclosed in Japanese Patent Application Laid-Open No. 2013-142222, the present applicant can perform the work accurately as designed in the present invention. Therefore, there is no fear of violating the Building Standard Law.

(2) The width of the staircase is not narrowed. The staircase width is secured by separating the step nose of the first round footboard from the reference line and the like, so that the staircase width is not narrowed.
(3) Easy design of the stepping plate In the present invention, particularly when designing with CAD, the size of the stepping plate and the corresponding stepping plate are sequentially moved from the first stepping plate by moving the nosing of the first stepping plate in parallel. Since the shape of the board is automatically determined, it is easy to design the treadle.

(4) The area occupied by the stairs is small As the four-step staircase that conforms to the Building Standards Act can be designed and constructed as described above, the three-step staircase that can only be lifted and lowered by three steps at the 90-degree folded part of the staircase In comparison, a four-step staircase that can move up and down in four steps of the same size can save one step on the tread board with respect to the floor area of the staircase.
Furthermore, it can be said that the four-step staircase is connected, and the eight-step staircase where the 180-degree turn-back portion of the turn-up staircase is made up of eight steps is also a six-step staircase (only six steps can be raised and lowered at the turn-up portion ( Compared with two steps of three steps, it is possible to move up and down eight steps at the same size. That is, since two steps of treads can be saved, the living area other than the stairs can be increased accordingly.

Further, according to the four-step staircase design method of the second aspect, the same effect as that of the first aspect of the invention is obtained.
Further, when the size of the first stepping plate is smaller than the legal value, the first stepping plate has a nose inclination in the virtual XY plane, and the first stepping plate has a size larger than the legal value. Since the virtual Y-intercept of the nose of the first turn plate is changed, the nose of the first turn plate in the virtual XY plane can be expressed by a simple mathematical formula, which can be easily designed and processed accurately.
That is, the slope of the nose of the first stepboard is constant at 22.5 degrees, and if the virtual Y intercept of the nose of the first stepboard is set to an integer value, the formula of the nose of the first stepboard is very simple. In addition, it is easy to specify with the NC processing machine and the machining can be performed accurately.
The same applies to the nose of the second turn plate to the fourth turn plate, which is easy to design and can be processed accurately.

Moreover, according to the design method of the four-step staircase described in claim 3, the same effect as that of the invention described in claim 1 is obtained.
Furthermore, the virtual Y-intercept of the nose of the first turnboard to the fourth turnboard is uniquely determined by matching the size of the first and fourth turnsteps to the legal value, so that the most staircase in a small house The floor area can be reduced, and as a result, the living area can be maximized.

  As in the four-step staircase design method of the present invention, the angle between the nose of the circuit board and the reference line is maintained at 22.5 degrees, and the circuit board size of the circuit board is equal to or greater than the legal value. The point of separating the nose from the reference line is not described at all in the above-mentioned Patent Documents 1 and 2.

It is a plane schematic diagram showing the four-step staircase according to the first embodiment of the present invention. FIG. 2 is an enlarged schematic plan view showing a main part of the four-step staircase shown in FIG. 1. It is a top view which shows the four-step staircase shown in FIG. It is a side view which shows the relationship between a turning step board and a kick board. It is a top view which shows the four-step staircase which concerns on 2nd embodiment of this invention. FIG. 6 is a plan view showing an eight-step staircase combining the four-step staircase shown in FIG. 3 and the four-step staircase shown in FIG. 5. It is a perspective view which shows four steps around stairs. It is a plane schematic diagram showing four steps around the conventional example.

(First embodiment)
With reference to FIG. 1 thru | or FIG. 4, the design method of the four-step staircase 1 which concerns on embodiment of this invention is demonstrated.
This turning staircase is a four-step staircase 1 (left-handed staircase) in which a 90-degree portion is turned by a four-step turning plate among the turning portions of the turning staircase whose direction changes by 180 degrees at the beginning and ascending.
More specifically, while the heights of the reference stepping plate 50, the first turning stepboard 10, the second turning stepping plate 20, the third turning stepping plate 30, and the fourth turning stepping plate 40 are sequentially reduced, the respective noses 11, 21, respectively. 31 and 41 are sequentially rotated at an angle of 22.5 degrees. Here, the reference step board 50 is a landing for a folded staircase.
The same parts as those shown in the conventional example are denoted by the same reference numerals.

First, the positions of the reference turning plate 50, the first turning plate 10, the second turning plate 20, the third turning plate 30, and the fourth turning plate 40 are temporarily determined. The positions of the provisionally determined noses 11, 21, 31, 41 are indicated by double chain lines in FIG.
That is, the center of the center column C is set as the origin O of the virtual XY plane, and the reference line 51 that is the nose 51 of the reference turning plate 50 is made to coincide with the virtual Y axis.

Next, a straight line is drawn at a position obtained by rotating the virtual Y axis clockwise from the origin O at an angle of 22.5 degrees, and this is used as the nose 11 of the first turn board 10.
Next, a straight line is drawn from the origin O to the position where the nose 11 of the first turn plate 10 is rotated at an angle of 22.5 degrees clockwise, and this is used as the nose 21 of the second turn plate 20.

Next, a straight line is drawn from the origin O to the position where the nose 21 of the second turn tread 20 is rotated at an angle of 22.5 degrees clockwise, and this is used as the nose 31 of the third turn tread 30.
Next, a straight line is drawn from the origin O to the position where the nose 31 of the third turn plate 30 is rotated clockwise by an angle of 22.5 degrees, and this is used as the nose 41 of the fourth turn plate 40. That is, the nose 41 of the fourth turn board 40 coincides with the virtual X axis orthogonal to the virtual Y axis.
Thus, the position of the nose 41 of the first turn plate 10 to the fourth turn plate 40 can be provisionally determined.

  In the temporarily determined state, if the size S of the first stepping plate 10 is smaller than the legal value (150 mm), the first stepping step 11 is maintained while maintaining the inclination of the nose 11 of the first stepping plate 10 in the virtual XY plane. The virtual Y intercept 12 of the nose 11 of the first turning board 10 is changed until the turning board dimension S of the walking board 10 becomes equal to or greater than the legal value (from the origin O to 12 in FIG. 2). That is, the virtual Y-intercept 12 is moved in the negative direction of the virtual Y-axis, and the movement of the virtual Y-intercept 12 is stopped when the turning step size S of the first turning step 10 becomes equal to or greater than the legal value.

  Next, when the turning step size S of the second turning step plate 20 after moving the virtual Y section 12 of the nosing 11 of the first turning step plate 10 is smaller than the legal value, the second turning step plate 20 in the virtual XY plane is obtained. 2, the virtual Y-intercept 22 of the nose 21 of the second turn plate 20 is changed until the turn step size S of the second turn plate 20 becomes equal to or greater than the legal value (from the origin O in FIG. 2 to 22). What).

Thereafter, in the same way, when the turning step size S of the third turning plate 30 after moving the virtual Y section 22 of the nose 21 of the second turning step plate 20 is smaller than the legal value, the third turning in the virtual XY plane. While maintaining the inclination of the nose 31 of the step board 30, the virtual Y intercept 32 of the nose 31 of the third step board 30 is changed until the size S of the third step board 30 becomes equal to or greater than the legal value (the origin O in FIG. 2). To 32).
Finally, if the turning step size S of the fourth turning plate 40 after moving the virtual Y section 32 of the nose 31 of the third turning step plate 30 is smaller than the legal value, the fourth turning plate 40 in the virtual XY plane is obtained. 2, the virtual Y-intercept 42 of the nose 41 of the fourth turn plate 40 is changed until the turn step size S of the fourth turn plate 40 becomes equal to or greater than the legal value (from the origin O in FIG. 2 to 42). What). The nose 41 of the fourth turn plate 40 is almost not coincident with the X axis, but remains parallel to the X axis.
As a result, the positions of the noses 11, 21, 31, 41 of all the surrounding tread boards 10, 20, 30, 40 are determined.

This design method is expressed in another expression as follows.
From the temporarily determined state, the angle between the nose 11 of the first turn plate 10 and the reference line 51 is maintained at 22.5 degrees, and the first turn until the turn step size S of the first turn plate 10 becomes a legal value or more. The nose 11 of the tread board 10 is separated from the reference line 51.
Next, the angle between the nose 21 of the second turn tread 20 and the nose 11 of the first turn tread 10 is maintained at 22.5 degrees, and the second step tread board 20 has a step S dimension S that exceeds the legal value. The nose 21 of the two-step tread plate 20 is separated from the nose 11 of the first turn tread 10 after the movement.

Next, while maintaining the angle between the nose 31 of the third turn plate 30 and the nose 21 of the second turn plate 20 at 22.5 degrees, the first step until the turn step size S of the third turn plate 30 exceeds the legal value. The nose 31 of the third turn tread 30 is separated from the nose 21 of the second turn tread 20 after the movement.
Finally, the angle between the nose 41 of the fourth turn plate 40 and the nose 31 of the third turn plate 30 is maintained at 22.5 degrees, and the first step until the turn step size S of the fourth turn plate 40 becomes equal to or greater than the legal value. The nose 41 of the fourth turn board 40 is separated from the nose 31 of the third turn board 30 after the movement.

  As shown in FIGS. 3 and 4, the kick plate 13 is disposed between the adjacent stepping plates 10, 20 and 30 mm behind the nose 11 and parallel to the nose 11. The other kick plates 23, 33, 43, 53 are also arranged in the same manner.

According to the design method of the four-step staircase 1 as described above, the virtual Y-intercept 12 of the nose 11 of the first turntable 10 is changed until the size S of the first stepboard 10 exceeds the legal value. There are the following effects.
The same applies to the second turn tread 20, the third turn tread 30, and the fourth turn tread 40.
(1) It does not violate the Building Standards Law The turn step size S of the first turn step plate 10 to the fourth turn step plate 40 can be surely set to a legal value or more.
Here, by assembling the first turn plate 10 and the like by faithfully following the procedure disclosed by the present applicant in Japanese Patent Application Laid-Open No. 2013-142222, the construction can be performed exactly as designed in the present invention. Therefore, there is no fear of violating the Building Standard Law.

(2) The width of the staircase is not narrowed. The staircase width S is secured by separating the nose of the first round footboard 10 and the like from the reference line 51 and the like, so that the staircase width is not narrowed.
(3) Easy design of the stepping plate In the present invention, particularly when designing with CAD, the stepping plate dimension S and the first stepping plate 10 are sequentially moved from the first stepping plate 10 only by moving the nose 11 such as the first stepping plate 10 in parallel. As a result, the shape of the turntables 10, 20, 30, 40 is automatically determined, so that the design of the turntables 10, 20, 30, 40 is easy.
Further, since the nose 11 of the first turn board 10 in the virtual XY plane can be expressed by a simple mathematical expression, the design is easier and more accurate processing is possible.
That is, the inclination of the nose 11 of the first turnboard 10 is constant at 22.5 degrees, and if the virtual Y intercept 12 of the nose 11 of the first turntable 10 is set to an integer value, the nose of the first turnboard 10 is set to an integer value. The formula of 11 becomes very simple, and it is easy to specify with an NC processing machine, and machining can be performed accurately.
The same applies to the noses 21, 31, and 41 of the second turn plate 20 to the fourth turn plate 40, and the design is easy and accurate processing is possible.

(4) The area occupied by the stairs is small As the four-step staircase 1 that conforms to the Building Standards Law can be designed and constructed as described above, the three-step staircase that can only be lifted and lowered by three steps at the 90-degree folded part of the staircase Compared with the four-step staircase 1 that can move up and down in four steps with the same size, it is possible to save one step on the tread board for the floor area of the staircase.

(Second embodiment)
Next, with reference to FIG. 5, the design method of the four-step staircase 1 which concerns on 2nd embodiment of this invention is demonstrated. In addition, the same code | symbol was attached | subjected to the same part as 1st embodiment.
The difference of this embodiment from the first embodiment is the direction of the handrail including the center column C.
In this case, if the XY plane is set by rotating 90 degrees from the first embodiment, it is the same as the first embodiment.
That is, assuming that the virtual axis extending left and right in FIG. 5 is the virtual Y axis and the virtual axis extending vertically is the virtual X axis in FIG. 5, the reference turning plate 50, the first turning plate 10, the second turning plate 20, and the third turning plate. The positional relationship between the turning step board 30 and the fourth turning step board 40 is the same as that of the first embodiment.

  Therefore, the same effect as the design method of the four-step staircase 1 according to the first embodiment can be obtained, such as the four-step staircase 1 conforming to the Building Standard Law.

Here, when the four-step staircase 1 (FIG. 3) according to the first embodiment is connected to the four-step staircase 1 (FIG. 5) according to the second embodiment, the 180-degree turnback in the turnstep shown in FIG. The part is an eight-step staircase consisting of eight steps.
Compared with a six-step staircase that can only be lifted and lowered by six steps at the folded part (two staircases for three steps), eight steps can be lifted at the same size while conforming to the Building Standards Act. That is, since two steps of treads can be saved, the living area other than the stairs can be increased accordingly.

In each of the first and second embodiments, each nose is determined with a certain width so that the round tread board dimension S is equal to or larger than the legal value. However, the present invention is not limited to this, and the round tread board dimension S is just the legal value. You may make it become.
By doing so, the floor area of the stairs can be made the smallest in a small house, so the living area can be made the largest.

Moreover, although the left-handed staircase is used, the present invention is not limited to this, and a right-handed staircase may be used.
For simplicity, the reference line 51 is matched with the virtual Y axis. However, the present invention is not limited to this, and the reference line 51 may be parallel to the virtual Y axis.

  Furthermore, the position of the kick plate is determined based on the stair nosing. However, the present invention is not limited to this, and the position of each stair nose may be determined based on each kick plate. That is, the kick plate between the reference turning plate 50 and the first turning plate 10 may be made to coincide with the virtual Y axis.

  Moreover, although applied to the folding staircase, the present invention is not limited to this, and the design method for the four-step staircase 1 may be applied to the folding portion of the folding staircase.

1 Four-step staircase 10 First turn step plate 11 First step step plate nose 12 Virtual Y section 13 Kick plate 20 Second turn step plate 21 Second turn step plate nose 22 Virtual Y section 23 Kick plate 30 Third turn step plate 31 No. 1 Nose of the three-turn step board 32 Virtual Y section 33 Kicking plate 40 Fourth turn step board 41 Nozzle of the fourth turn tread 42 Virtual Y section 43 Kick plate 50 Reference turning step board 51 Reference line 53 Kicking board C Center column O Origin S Turning board size

Claims (3)

While changing the height of the first turnboard, the second turntable, the third turnboard, and the fourth turntable in order, each nose is angled by 22.5 degrees from the reference line parallel to the virtual Y axis. In the four-step staircase design method, the step nose of the fourth turn plate is rotated in order and arranged parallel to the virtual X axis perpendicular to the virtual Y axis.
While maintaining the angle between the reference nose of the first stepping plate and the reference line at 22.5 degrees, the nose of the first stepping plate is set to the reference line until the size of the stepping plate of the first stepping plate exceeds a legal value. Away from
While maintaining the angle between the nose of the second turn plate and the nose of the first turn plate at 22.5 degrees, the nose of the second turn plate until the size of the turn plate of the second turn plate becomes a legal value or more. Is moved away from the nose of the first step board after the movement,
While the angle between the nose of the third turn plate and the nose of the second turn plate is maintained at 22.5 degrees, the size of the third turn plate is maintained until the size of the turn plate of the third turn plate reaches the legal value or more. Separate the nose from the nose of the second step board after moving,
While maintaining the angle between the nose of the fourth turn tread and the nose of the third turn tread at 22.5 degrees, the size of the fourth turn tread is adjusted until the size of the fourth step tread is equal to or greater than the legal value. A method for designing a four-step staircase, characterized in that the step nose is separated from the step nose of the third turn plate after movement. While changing the height of the first turnboard, the second turntable, the third turnboard, and the fourth turntable in order, each nose is angled by 22.5 degrees from the reference line parallel to the virtual Y axis. In the four-step staircase design method, the step nose of the fourth turn plate is rotated in order and arranged parallel to the virtual X axis perpendicular to the virtual Y axis.
When the size of the first stepping plate is smaller than the legal value, the size of the first stepping plate exceeds the legal value while maintaining the inclination of the nose of the first stepping plate in the virtual XY plane. Change the virtual Y-intercept of the nosing of the first step board until
In a case where the size of the second stepping plate after the movement of the virtual Y-intercept of the first stepping plate nose is smaller than the legal value, the inclination of the nose of the second stepping plate in the virtual XY plane The virtual Y-intercept of the nose of the second turn plate is changed until the size of the turn plate of the second turn plate is equal to or greater than the legal value,
In the case where the size of the third stepping plate after the movement of the virtual Y-section of the second stepping plate nose is smaller than the legal value, the inclination of the third stepping plate nose in the virtual XY plane The virtual Y-intercept of the nose of the third stepping plate is changed until the size of the stepping plate of the third stepping plate is equal to or greater than the legal value,
In the case where the size of the stepping plate of the fourth stepping plate after moving the virtual Y-intercept of the nose of the third stepping plate is smaller than the legal value, the inclination of the nose of the fourth stepping plate in the virtual XY plane A design method for a four-step staircase is characterized in that the virtual Y-intercept of the nose of the fourth stepping plate is changed until the size of the stepping plate of the fourth stepping plate becomes equal to or greater than the legal value while maintaining the above. While changing the height of the first turnboard, the second turntable, the third turnboard, and the fourth turntable in order, each nose is angled by 22.5 degrees from the reference line parallel to the virtual Y axis. In the four-step staircase design method, the step nose of the fourth turn plate is rotated in order and arranged parallel to the virtual X axis perpendicular to the virtual Y axis.
While maintaining the inclination of the nose of the first stepping plate in the virtual XY plane, the virtual Y intercept of the nosing of the first stepping plate is uniquely determined by matching the size of the stepping plate of the first stepping plate with a legal value,
While maintaining the inclination of the nose of the second turn plate in the virtual XY plane, the size of the turn plate of the second turn plate after the determination of the virtual Y intercept of the nose of the first turn plate is made to match the legal value. And uniquely determining the virtual Y-section of the nose of the second stepping board,
While maintaining the inclination of the nose of the third stepping plate in the virtual XY plane, the size of the stepping plate of the third stepping plate after the determination of the virtual Y intercept of the nosing of the second stepping plate is made to match the legal value. To uniquely determine the virtual Y-section of the nose of the third turn plate,
While maintaining the inclination of the nose of the fourth stepping plate in the virtual XY plane, the size of the stepping plate of the fourth stepping plate after the determination of the virtual Y intercept of the nosing of the third stepping plate is made to match the legal value. A method for designing a four-step staircase, wherein a virtual Y-intercept of the nose of the fourth step board is uniquely determined.