Interior staircase for apartment house

Abstract

To provide an interior staircase for an apartment house, which allows access to a space below the stairs from the front side and enables the space to be used as a walk-in type storage room under the stairs.SOLUTION: The interior staircase includes left and right side panels 2, a plurality of step panels 3 whose left and right ends are supported by the side panels 2, and locking means. The locking means is configured to be switchable between a locked state in which the step panels 3 are locked in the appropriate position on the side panels 2, and a released state in which the engagement between the side panels 2 and the step panels 3 is released and the step panels 3 can be removed. Of the step panels 3, a plurality of consecutive step panels 3 on the lower side, including the lowest one, are configured as movable step panels 31 that can be removed from the side panels 2 by switching the locking means, and an opening with a height of 900 mm or more is formed between the left and right side panels 2 by removing the movable step panels 31 from the side panels 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an interior staircase for an apartment building, and more particularly to an interior staircase for an apartment building that allows users of the staircase to use the space below as a walk-in storage room. [Background technology]

[0002] Small-scale (for example, with around 4 to 12 households) two-story rental apartment buildings come in a variety of styles, including those in which a shared staircase for the second-floor units is installed on the exterior wall of the building (external staircase type), and those in which the second-floor units have separate entrances on the first floor, with dedicated internal staircases installed behind the individual entrances for the second-floor units (internal staircase type).

[0003] Figure 8 shows an example of the configuration of a conventional two-story rental apartment building 51 with an internal staircase. In this apartment building 51, an entrance 55 for a second-floor apartment 54 is located next to an entrance 53 for a first-floor apartment 52, and an internal staircase 56 exclusively for the residents of the second-floor apartment 54 is provided at the back of this entrance 55. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-97042 Summary of the Invention [Problem to be solved by the invention]

[0005] In a typical two-story home, the space under the stairs is often used as a storage room, but such storage rooms are usually designed to be accessed from the side (or back) of the stairs.

[0006] The internal staircase 56 for the second-floor dwelling unit 54 of the apartment building 51 shown in Figure 8 is separated on both sides by partition walls 57 (walls that separate the dwelling units in an apartment building), making it difficult to configure the space below this internal staircase 56 as a storage room under the stairs that can be used by the residents of the second-floor dwelling unit 54 who use this staircase.

[0007] The present invention is intended to solve the problems of the prior art, and aims to provide an internal staircase for an apartment building that allows access to the space below the stairs from the front side even when both sides are separated by parting walls, and that allows the space to be used as a walk-in type storage room under the stairs. [Means for solving the problem]

[0008] The internal staircase for an apartment building of the present invention is an internal staircase for an apartment building that is installed between two parting walls and has left and right side panels fixed respectively to the two parting walls, a plurality of horizontal step panels whose left and right ends are supported by the side panels, and a locking means.The locking means is configured to be able to switch between a locked state in which the step panels are locked in the appropriate position on the side panels, and an released state in which the engagement between the side panels and the step panels is released and the step panels can be removed.The locking means is characterized in that a plurality of consecutive step panels on the lower side, including the lowest step, are configured as movable step panels that can be removed from the side panels by switching the locking means, and that by removing the movable step panel from the side panels, an opening of 900 mm or more in height is created between the left and right side panels.

[0009] Furthermore, it is preferable that the locking means be composed of a vertical hole formed from the horizontal surface of the side plate toward the inside, a horizontal hole formed from the inner surface of the side plate toward the inside, a socket inserted inside this horizontal hole, and a connecting bolt attached to the movable step plate so as to protrude downward from the lower surface of the movable step plate, and it is also preferable that the connecting bolt have a small diameter portion between the lower end and the main body which has a diameter or width dimension smaller than the lower end.

[0010] Furthermore, it is preferable that a hollow portion large enough to receive the lower end of the connecting bolt is formed inside the socket, a through hole having a diameter larger than the lower end of the connecting bolt and communicating with the hollow portion is formed on the outer surface of the socket, and a notch having a width dimension larger than the diameter of the small diameter portion of the connecting bolt and smaller than the diameter of the lower end of the connecting bolt is formed circumferentially offset from the through hole on the outer surface of the socket so as to be continuous with the through hole.

[0011] Furthermore, when the through hole of the socket is open upward and the connecting bolt of the movable step plate is inserted into the vertical hole of the side plate, the lower end of the connecting bolt passes through the through hole and enters the hollow portion, and when the socket is rotated in a predetermined direction in this state, the notch moves above the lower end of the connecting bolt to enter a locked state, and it is preferable that when the socket is rotated in the opposite direction, it enters an unlocked state.

[0012] Furthermore, it is preferable that the thickness of the side plates that support the movable step plates is set within the range of 55 to 65 mm. [Effects of the Invention]

[0013] The internal staircase for apartment buildings of the present invention is configured so that the consecutive steps (movable steps) on the lower side, including the bottom step, can be removed from the side panels. Therefore, even if both sides are separated by parting walls, by removing these steps, it is possible to enter and exit the space below the stairs from the front side. Therefore, the space under the stairs can be used as a walk-in type under-stairs storage room. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of an interior staircase 1 according to the present invention. [Figure 2] FIG. 2 is a perspective view of the interior staircase 1 according to the present invention (with the movable step plate 31 shown in FIG. 1 removed). [Figure 3] FIG. 3 is an explanatory diagram of a means for locking the movable step plate 31 relative to the side plate 2. [Figure 4] FIG. 4 is a perspective view of the connecting bolt 33 and the socket 23 shown in FIG. [Figure 5] FIG. 5 is a plan view of the socket 23 shown in FIG. 4 (in a state where the lower end 34 of the connecting bolt has entered the hollow portion 24). [Figure 6] FIG. 6 is a plan view of the socket 23 shown in FIG. 4 (with the lower end 34 of the connecting bolt trapped within the hollow portion 24). [Figure 7] FIG. 7 is a diagram showing another example of the configuration of the socket 23 (locking means) used in the interior staircase 1 according to the present invention. [Figure 8] FIG. 8 is a diagram showing an example of the structure of a conventional two-story rental housing complex 51 with an internal staircase. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, an embodiment of the "internal staircase for apartment buildings" of the present invention will be described with reference to the accompanying drawings. Figure 1 is a perspective view of an internal staircase 1 (an internal staircase exclusively for residents of second-floor dwelling units) according to the present invention. This internal staircase 1, like the internal staircases used in general wooden buildings, is composed of left and right side panels 2, horizontal treads 3 supported at both left and right ends by the side panels 2, and vertical risers 4 arranged between adjacent treads 3 on the top and bottom.

[0016] This internal staircase 1 is formed between two partition walls (see partition wall 57 in Figure 8) not shown, and the left and right side panels 2 are each fixed to these partition walls via vibration-damping means (sound-proofing sheets, etc.).

[0017] A characteristic feature of the present invention is that of the step boards 3, the five consecutive step boards 3 on the lower side (the step boards 3 from the bottom to the fifth step) are configured as movable step boards 31 that can be removed from the side board 2, and that no risers are arranged between these movable step boards 31 (in the area below the fifth movable step board 31).

[0018] Furthermore, since no risers are arranged between the movable step plates 31, the thickness of the movable step plate 31 and the side plate 2 supporting the movable step plate 31 is set to be larger than that of a typical step plate or side plate (thickness of about 36 mm). More specifically, in this embodiment, the thickness of the movable step plate 31 and the side plate 2 supporting the movable step plate 31 is set to 60 mm (preferably 55 to 65 mm).

[0019] Figure 2 shows the interior staircase 1 shown in Figure 1 with the movable step panel 31 removed. When the movable step panel 31 is removed, an opening large enough for an average adult to pass through is formed between the left and right side panels 2, as shown in the figure, allowing users of the interior staircase 1 (residents of the second-floor apartments) to enter and exit the space S below the interior staircase 1 (the space indicated by the dashed line in Figures 1 and 2) from the front side of the interior staircase 1. In other words, this space S can be suitably used as a walk-in type under-stairs storage room.

[0020] For example, if a resident of a second-floor apartment in a two-story rental apartment building with an internal staircase wanted to store a bicycle, surfboard, kayak, winter tires, etc. indoors, they would previously have had to carry them up the internal staircase.However, in an apartment building equipped with the internal staircase 1 of the present invention, by removing the movable step 31, they can store and keep these items in the space S below the internal staircase 1 (see Figures 1 and 2).

[0021] In this embodiment, by removing the movable step 31, an opening approximately 1000 mm high and 700 mm wide can be formed, but if the height of the opening is 900 mm or more, an average adult can pass through without any problems, and bicycles and other vehicles can also pass through without any problems.

[0022] 3 is an explanatory diagram of the means (locking means) for locking the movable step plate 31 in the appropriate position on the side plate 2. This locking means is composed of a vertical hole 21 formed inward from the horizontal surface of the side plate 2 (the surface that supports the movable step plate 31), a horizontal hole 22 formed inward from the inner surface of the side plate 2, a socket 23 inserted into the hole 22, and a connecting bolt 33 attached to the movable step plate 31 so as to protrude downward from the lower surface 32 of the movable step plate 31.

[0023] 4 is a perspective view of the connecting bolt 33 and socket 23. The connecting bolt 33 has a lower end 34 formed in a hemispherical shape at the lower end of the body, and a small-diameter portion 35 between the lower end 34 and the body, the small-diameter portion 35 having a smaller diameter (or width dimension) than the lower end 34. The connecting bolt 33 has a thread (not shown) formed on the outer circumferential surface of the upper half thereof, and is fixed to the movable step plate 31 by screwing the upper half into a pilot hole formed in the lower surface 32 of the movable step plate 31 shown in FIG.

[0024] Socket 23 is formed in a cylindrical shape, and has a hollow portion 24 formed therein that is large enough to receive lower end 34 of connecting bolt 33. A through hole 25 that communicates with hollow portion 24 is formed in the outer peripheral surface of socket 23, and a notch 26 that has a width dimension smaller than the diameter of through hole 25 is formed at a position offset from this through hole 25 in the circumferential direction (direction around the central axis) of the outer peripheral surface of socket 23 so as to be continuous with through hole 25.

[0025] The through-hole 25 has a diameter larger than the lower end 34 of the connecting bolt 33, allowing the lower end 34 of the connecting bolt 33 to pass through and enter the hollow portion 24. The width of the cutout 26 is larger than the diameter of the small-diameter portion 35 of the connecting bolt 33, but smaller than the diameter of the lower end 34 of the connecting bolt 33.

[0026] In the internal staircase 1 of the present invention, these locking means make it possible to easily switch between a "locked state" in which the movable step plate 31 is fixed to the side plate 2, and an "released state" in which the engagement between the side plate 2 and the movable step plate 31 is released, making it possible to remove the movable step plate 31.

[0027] More specifically, the lower end of vertical hole 21 in side plate 2 communicates with the deepest part of horizontal hole 22 inside side plate 2, and socket 23 is inserted into horizontal hole 22 so that hollow portion 24 is located directly below vertical hole 21. When connecting bolt 33 of movable step plate 31 shown in Figure 3 is inserted into vertical hole 21 in side plate 2 with through hole 25 of socket 23 open upward as shown in Figure 4, the hemispherical lower end 34 passes through through hole 25 and enters hollow portion 24 as shown in Figure 5 (a plan view of socket 23 showing the state in which lower end 34 has entered hollow portion 24).

[0028] In this state, when socket 23 is rotated clockwise by approximately 90° using a Phillips head screwdriver, notch 26, which has a width smaller than the diameter of lower end 34, moves above lower end 34 of connecting bolt 33 (to a position on the outer periphery of small diameter portion 35), as shown in Figure 6 (a plan view of socket 23 showing lower end 34 trapped within hollow portion 24). As a result, lower end 34 is trapped within hollow portion 24, restricting upward movement of connecting bolt 33 (see Figures 3 and 4), and movable step plate 31 is locked to side plate 2.

[0029] Conversely, if the socket 23 is rotated counterclockwise by approximately 90° from the state shown in Figure 6, the through hole 25 moves above the lower end 34, as shown in Figure 5, and the connecting bolt 33 can be moved upward, i.e., the movable step plate 31 enters a released state in which it can be removed.

[0030] 4 has a cross-shaped groove formed on the surface (head 27) that is exposed to the outside at the opening of horizontal hole 22 when socket 23 is inserted into horizontal hole 22 in side plate 2 for engaging a Phillips head screwdriver, but it is also possible to use a socket 23 with a lever 28 attached to the head, as shown in Figure 7. In this case, the user can directly grasp lever 28 and easily operate (rotate) it without using a screwdriver.

[0031] It is also possible to employ a socket (not shown) that transitions from a locked state to an unlocked state by pushing the head portion toward the inside of the side plate. [Explanation of symbols]

[0032] 1: Inner stairs, 2: Side panel, 21: longitudinal hole, 22: Horizontal hole, 23: Socket, 24: Hollow part, 25: through hole, 26: Notch, 27:Head, 28: Lever, 3: Step board, 31: Movable step board, 32: Lower side, 33: Connecting bolt, 34: Bottom end, 35: Small diameter part, 4: Riser board, 51:Apartment housing, 52: First floor dwelling unit, 53: Entrance, 54: Second floor apartment, 55: Entrance, 56:Inner stairs, 57: Partition wall,

Claims

1. An interior staircase for an apartment building installed between two parting walls, The structure comprises left and right side plates respectively fixed to the two partition walls, a plurality of horizontal step plates whose left and right ends are supported by the side plates, and a locking means; The locking means is configured to be switchable between a locked state in which the step plate is locked in a proper position on the side plate and a released state in which the engagement between the side plate and the step plate is released and the step plate can be removed; Among the step plates, a plurality of consecutive step plates on the lower side, including the lowest step, are configured as movable step plates that can be removed from the side plates by switching the locking means, This interior staircase for an apartment building is characterized in that an opening of 900 mm or more in height is formed between the left and right side panels by removing the movable step panels from the side panels.

2. The locking means is composed of a vertical hole formed from the horizontal surface of the side plate toward the inside, a horizontal hole formed from the inner surface of the side plate toward the inside, a socket inserted into the horizontal hole, and a connecting bolt attached to the movable step plate so as to protrude downward from the lower surface of the movable step plate, 2. The interior staircase for an apartment building according to claim 1, wherein the socket is configured so that it can be switched between a locked state and an unlocked state by rotating the socket in a predetermined direction.

3. The connecting bolt has a small diameter portion between the lower end portion and the body, the small diameter portion having a diameter or width dimension smaller than that of the lower end portion, The socket has a hollow portion formed therein that is large enough to receive the lower end of the connecting bolt, a through hole having a diameter larger than that of the lower end of the connecting bolt and communicating with the hollow portion is formed on the outer peripheral surface of the socket; a notch having a width dimension larger than the diameter of the small diameter portion of the connecting bolt and smaller than the diameter of the lower end portion of the connecting bolt is formed at a position circumferentially offset from the through hole on the outer peripheral surface of the socket so as to be continuous with the through hole; An interior staircase for an apartment building as described in claim 2, characterized in that when the connecting bolt of the movable step plate is inserted into the vertical hole of the side plate with the through hole of the socket open upward, the lower end of the connecting bolt passes through the through hole and enters the hollow portion, and when the socket is rotated in a predetermined direction in this state, the notch moves above the lower end of the connecting bolt to enter a locked state, and when the socket is rotated in the opposite direction, it enters an unlocked state.

4. An interior staircase for an apartment building according to any one of claims 1 to 3, characterized in that the thickness dimension of the side panels supporting the movable steps is set within the range of 55 to 65 mm.

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