JP7577032B2 - Staircase tread mounting structure - Google Patents

Description

This invention relates to a staircase step mounting structure that is used, for example, in wooden tiered stairs indoors in a typical home.

The mainstream method for installing wooden indoor stairs in ordinary houses such as detached houses is to have each assembly part prefabricated in a factory, etc., and then transport the stair parts to the assembly site for installation.

For example, wooden indoor stairs such as tiered stairs have a pair of left and right side panels (side panels) that are fixed at the staircase assembly site. The upper edges of these side panels are cut into a stepped shape, with horizontal and vertical sections arranged alternately. A step panel is fixed to each of the corresponding horizontal sections of the side panels, and a riser plate is fixed to each of the vertical sections.

For indoor wooden stairs like this, there are two methods for fixing the steps: the front-side work method, in which the work is done from the front side of the stairs, and the back-side work method, in which the work is done from the back side.

For example, in the conventional step mounting structure shown in Patent Document 1 below, a step is mounted to a side panel by driving a fastener such as a nail into the front side of the step, which is placed on the horizontal part of the side panel, and fixing the step to the horizontal part of the side panel. This type of front-side work method ensures a large working space and allows the worker to work in a natural, relaxed posture from the front side of the stairs, making it easy to position the nails and other parts, and allowing the step to be mounted easily and with high precision. However, it is necessary to separately attach decorative parts such as decorative covers and wooden plugs to the surface of the step panel so that the fasteners such as nails are not visible, which not only reduces the design, but also increases the number of parts required, making parts management more difficult and complicating the structure.

Meanwhile, in the conventional step mounting structure using the back-side work method shown in Patent Document 2 below, an L-shaped bracket (angle bracket) is placed at the corner between the inner surface of the side panel and the back surface of the step on the back side of the stairs, and one side of the bracket is screwed to the inner surface of the side panel and the other side is screwed to the back surface of the step, thereby attaching the step to the side panel. With this back-side work method, screws and other fasteners are not exposed on the front side, resulting in a good design.

It is also well known that in the general backside work method of mounting treads, crosspieces (support bars) are used. For example, a support bar is fixed to the inner surface of the side panel along the horizontal section with nails or the like, and the tread is placed on the horizontal section and the support bar. Then, a fastener such as a nail is driven into the tread panel from the underside of the support bar, penetrating it, thereby mounting the tread panel to the side panel. In this way, with a tread panel mounting structure that uses a support bar, as with the above, the fastener such as a nail is not exposed on the front surface, and therefore good design can be achieved.

Special Publication No. 7-109131 JP 2000-356017 A

However, with the step mounting structure using the receiving metal fittings shown in Patent Document 2 above, and the step mounting structure using the receiving rails above, it is necessary to work in an awkward position within the limited, narrow space on the underside (inside) of the stairs, which makes it difficult to perform operations such as screwing and nailing, and creates the problem that the steps cannot be mounted easily and accurately. Furthermore, the use of separate receiving metal fittings and receiving rails increases the number of parts, making parts management cumbersome and complicating the structure, and the problem could not be solved.

This invention was made in consideration of the above problems, and aims to provide a staircase step mounting structure that ensures good design while facilitating parts management and simplifying the structure, and that also allows steps to be mounted easily and accurately.

To solve the above problems, the present invention provides the following:

[1] A staircase step mounting structure having a pair of side panels arranged at an interval and a step panel installed on a horizontal portion provided on the side panels,
A tip hole is formed which extends linearly from the inner surface of the side plate toward the horizontal portion and whose upper end is inclined outwardly with respect to the lower end,
A staircase step mounting structure characterized in that the step is fixed to the side plate by positioning the head of a fixing device, the head being provided at the base end of the shaft, at the lower end side of the tip hole, and the tip side of the shaft penetrating the side plate through the tip hole, thereby fixing the step to the side plate.

[2] A countersunk recess is provided in the side plate in correspondence with the lower end side of the tip hole, and the head of the fixing tool is disposed in the countersunk recess;
2. The staircase step mounting structure according to claim 1, wherein the head abuts and engages with the seat surface of the countersunk recess.

[3] A staircase step mounting structure as described in paragraph 2 above, in which the head of the fastener is housed within the countersunk recess.

[4] A staircase step mounting structure as described in paragraphs 2 or 3 above, in which the head of the fastener is placed in surface contact with the seat surface of the countersunk recess.

[5] A staircase step mounting structure as described in any one of paragraphs 1 to 4 above, in which the inner diameter of the tip hole is larger than the outer diameter of the shaft of the fastener.

[6] The fixing device is constituted by a screw,
6. The staircase step mounting structure according to claim 5, wherein an upper end of the tip hole opens into the horizontal portion of the side plate.

[7] A vertical portion extending upward is provided at a rear end of the horizontal portion of the side plate,
7. The staircase step mounting structure according to claim 6, wherein the tip hole is formed so that its upper end is inclined forward relative to its lower end.

[8] A step mounting structure for a staircase as described in paragraph 7 above, in which a riser plate is disposed along the front surface of the vertical portion, and the lower end of the riser plate is interposed between the rear end surface of the step plate and the vertical portion.

[9] A staircase tread mounting structure as described in any one of paragraphs 1 to 8 above, which is applied to a straight staircase.

[10] A staircase step mounting structure as described in any one of the preceding paragraphs 1 to 8, which is applied to a spiral staircase.

[11] A method for attaching a staircase tread to a horizontal portion provided on a pair of side panels arranged at an interval, comprising:
A tip hole is formed in advance in the side plate, the tip hole extending linearly from the inner surface of the side plate toward the horizontal portion and having an upper end side inclined outwardly with respect to a lower end side of the side plate,
a step fixing device having a head on the base end side of an axial portion of the step, the head of the axial portion being positioned on the lower end side of the tip hole, the axial portion being passed through the side panel along the tip hole, and the tip side of the axial portion being fixed to the underside of the step, thereby fixing the step to the side panel.

[12] A side panel for a staircase having a horizontal portion for attaching a step plate,
A tip hole is formed which extends linearly from one surface constituting the inner surface toward the horizontal portion and whose upper end side is inclined outwardly with respect to the lower end side,
A side plate characterized in that the tip hole is configured as a guide hole for guiding a shaft portion of a fastener having a head portion provided on the base end side of the shaft portion.

The staircase tread mounting structure of invention [1] can be installed from the back side of the stairs, so the fasteners are not exposed on the front side, resulting in good design. Furthermore, the treads can be mounted simply and accurately by simply driving the fasteners through the tip holes into the treads, and there is no need to use separate parts for fixing the treads, such as braces or brackets, which reduces the number of parts, simplifies parts management, and simplifies the structure.

According to the staircase step mounting structure of the invention [2], a countersunk recess is formed on the inner surface of the side plate of the tip hole, and the head of the fastener is engaged with the seat of the countersunk recess, which prevents the fastener from being driven in more than necessary and reliably prevents problems such as the tip of the fastener protruding from the surface of the step.

According to the staircase step mounting structure of the invention [3], the head of the fastener is stored in the countersunk recess, so that it is possible to reliably prevent problems such as the head of the fastener protruding from the back side of the staircase.

The staircase step mounting structure of invention [4] allows the head of the fastener to be securely and stably engaged with the seat surface of the countersunk recess.

The staircase step mounting structure of invention [5] allows the shaft of the fastener to be smoothly inserted into the tip hole.

According to the staircase tread mounting structure of invention [6], the tread can be pulled downward by screwing the screw into the tread, and this pulling movement allows the tread to be precisely mounted in contact with the horizontal part of the side panel without any gaps.

According to the staircase step mounting structure of inventions [7] and [8], the step can be pulled backward by screwing the screw into the step, and this pulling movement allows the step to be mounted with high precision with the rear end face of the side panel in contact with the riser plate or the like without any gaps.

The staircase step mounting structure of invention [9] can achieve the same effect as above for straight stairs.

The staircase step mounting structure of invention [10] can achieve the same effect as above for spiral staircases.

The staircase tread mounting method of the preceding paragraph [11] specifies the manufacturing process for the staircase tread mounting structure of invention [1], and therefore makes it possible to manufacture a tread mounting structure having the same effect as invention [1].

The staircase side panel of the preceding paragraph [12] specifies the side panel that is the main part of the staircase step mounting structure of invention [1], so that a step mounting structure having the same effect as invention [1] can be formed.

FIG. 1 is a perspective view for explaining the structure of a straight staircase to which a step mounting structure according to an embodiment of the present invention is applied. FIG. 2 is a cross-sectional view corresponding to the cross section taken along line II-II in FIG. FIG. 3 is an exploded cross-sectional view of FIG. FIG. 4 is a cross-sectional view corresponding to the cross section taken along line IV-IV in FIG. FIG. 5 is an exploded cross-sectional view of FIG. FIG. 6 is a perspective view for explaining the structure of a spiral staircase to which the step mounting structure of the present invention can be applied.

Figure 1 is a perspective view for explaining the structure of a straight staircase to which a step mounting structure according to an embodiment of the present invention is applied. In this embodiment, in order to facilitate understanding of the invention, the direction facing when descending the stairs is referred to as the front side, and the direction facing when ascending the stairs is referred to as the rear side.

As shown in Figure 1, the stairs of this embodiment are tiered wooden indoor stairs, and include a pair of left and right side panels (both side panels) 1, a number of step panels 2 attached to the both side panels 1, and a number of riser panels.

In this embodiment, both side panels 1 are formed to be substantially the same shape, and are fixed to the house structure in a state where they are arranged parallel to each other with a gap in the left-right direction (frontage width direction) and extend diagonally upward toward the rear.

The upper edge of the side panel 1 from the front end to the rear end is cut in a stepped pattern, resulting in multiple horizontal sections 12, which are horizontal cuts, and multiple vertical sections 13, which are vertical cuts, arranged alternately. In this embodiment, the horizontal sections 12 of the side panel 1 function as step installation sections, and the vertical sections 13 function as riser installation sections.

In this embodiment, the side panel 1 is made of plywood with a thickness of, for example, 18 mm to 36 mm.

The step board 2, also called the tread board, can be made of a base material made of plywood or laminated wood with a thickness of 20 mm to 45 mm, and then decorated with veneer, sawn board, decorative sheet, etc.

In this embodiment, a fitting groove 22 is formed on the underside of the front end of the step 2, extending along the width of the staircase entrance (length of the step) and opening downward. This fitting groove 22 is formed to a size and shape that allows the upper edge of the riser plate 3 to be fitted into it in a positioned state. The part of the step 2 forward of the fitting groove 22 is configured as the step nosing.

The riser board 3 can be made of plywood or MDF with a thickness of about 6 mm to 15 mm, and decorated with veneer, sawn board, decorative sheet, etc.

Needless to say, in the present invention, there are no particular limitations on the material (material) or thickness of the side panel 1, the material (material) or thickness of the step panel 2, or the material (material) or thickness of the riser panel 3.

Figure 2 is a cross-sectional view corresponding to the cross section taken along line II-II in Figure 1, Figure 3 is an exploded cross-sectional view of Figure 2, Figure 4 is a cross-sectional view corresponding to the cross section taken along line IV-IV in Figure 1, and Figure 5 is an exploded cross-sectional view of Figure 4.

As shown in Figures 1 to 5, pilot holes (pre-holes) 4 are formed near each horizontal portion 12 on the inner surface of both side panels 1 of the staircase of this embodiment. In this embodiment, two pilot holes 4 are formed for each horizontal portion 12. In this embodiment, the pilot holes 4 are formed in advance in a factory or the like, and are not formed at the staircase assembly site, but may be formed at the staircase assembly site.

The tip hole 4 is formed to extend linearly from the inner surface of the side plate 1 toward the horizontal portion 12, with its upper end opening at the horizontal portion 12 and its lower end opening to the inner surface of the side plate 1 via a countersunk recess 5, which will be described in detail later.

As shown in Figures 2 and 3, the tip hole 4 is formed so that its upper end is positioned outward relative to its lower end. In other words, the tip hole 4 is arranged so that its axis Xa is inclined outward so that it is gradually positioned outward as it moves upward relative to the vertical axis Xb.

Furthermore, as shown in Figures 4 and 5, the tip hole 4 is formed so that its upper end is located forward of its lower end. In other words, the tip hole 4 is arranged so that its axis Xa is inclined forward so that it is gradually positioned forward as it moves upward relative to the vertical axis Xb.

The tip hole 4 is a so-called blind hole whose inner diameter is larger than the outer diameter of the shaft 62 of the screw 6, which will be described later. Needless to say, the inner diameter of the tip hole 4 is smaller than the outer diameter of the head 61 of the screw 6.

The countersunk recess 5 is configured with a seat 41 around the tip hole opening (step) where the lower end of the tip hole 4 opens, and this seat 41 is formed as a flat surface perpendicular to the axis Xa of the tip hole 4. As described below, the bottom surface (back surface) of the head 61 of the screw 6 is configured to be arranged so as to be in surface contact with the seat 41 of the countersunk recess 5. In this embodiment, when the head 61 of the screw 6 is in surface contact with the seat 41 and fits, the axis of the shaft 62 of the screw 6 is configured to substantially coincide with the axis Xa of the tip hole 4.

In this embodiment, the countersunk recess 5 is formed only around the tip hole 4, but the present invention is not limited to this. The countersunk recess may be formed over a wide area. For example, a continuous countersunk recess (groove for screw fastening) may be formed in the horizontal direction on the inner surface of the side plate 1, and the tip hole 4 may be formed in a part of the countersunk recess. Furthermore, the seating surface 41 does not necessarily have to be formed as a flat surface perpendicular to the axis Xa. The seating surface 41 may be inclined, curved, or uneven, without being perpendicular to the axis Xa.

In this embodiment, as shown in FIG. 3, the outward inclination angle θ1 of the axis Xa of the tip hole 4 (screw 6) relative to the vertical axis Xb is preferably set to 5° to 45°. Preferably, the lower limit of the inclination angle θ1 is set to 10° or more, more preferably to 20° or more. More preferably, the upper limit of the inclination angle θ1 is set to 40° or less, more preferably to 30° or less. In other words, in order to prevent a tool such as an impact driver used for screw fastening from interfering with the area around the screw fastening portion, it is preferable to set the outward inclination angle θ1 to 5° or more, and in order to fix the step plate 2 to the horizontal portion 12 of the side plate 1 with sufficient strength, it is preferable to set the angle θ1 to 45° or less. In other words, by setting the angle θ1 to the above specific range, when the screw 6 is screwed into the step plate 2 as described in detail later, the step plate 2 can be reliably drawn to the horizontal portion 12 of the side plate 1, and the step plate 2 can be reliably fixed on the horizontal portion 12 with high precision. In this embodiment, the outward inclination angle θ1 of the tip hole 4 is set to 25°.

In this embodiment, as shown in FIG. 5, the forward inclination angle θ2 of the axis Xa of the tip hole 4 (screw 6) relative to the vertical axis Xb is set to 1° to 45°. Preferably, the lower limit of the inclination angle θ2 is set to 5° or more, more preferably 10° or more, and even more preferably 20° or more. More preferably, the upper limit of the inclination angle θ2 is set to 40° or less, and more preferably 30° or less. As will be described in detail later, when the screw 6 is screwed into the step plate 2, the step plate 2 is pulled backward to position it. The inventor confirmed the effect of pulling the step plate 2 at an inclination angle θ2 of 5° and 45°, and determined that the effect of pulling the step plate 2 backward is present when the inclination angle θ2 is in the range of 5° to 45°. In other words, if the inclination angle θ2 is set within the above-mentioned specific range, when the screw 6 is screwed into the step plate 2, as described in detail later, the step plate 2 can be reliably pulled backward, the rear end face of the step plate 2 can be reliably brought into contact with the front face of the riser plate 3, and the step plate 2 can be reliably fixed onto the horizontal portion 12 with good precision and sufficient strength. In this embodiment, the forward inclination angle θ2 of the tip hole 4 is set to 25°.

In this embodiment, as shown in Figure 2, it is preferable to set the dimension A (horizontal allowance dimension) from the tip hole 4 in the horizontal portion 12 of the side plate 1 to the inner edge of the side plate to 5 mm or more, and furthermore, it is preferable to set the dimension B (vertical allowance dimension) from the countersunk recess 5 on the inner surface of the side plate 1 to the upper edge of the side plate to 5 mm or more. In other words, if these allowance dimensions A and B are too short, there is a risk that the allowances A and B of the side plate 1 may crack when fastening with screws, etc., which is not preferable.

In this embodiment, no holes equivalent to pilot holes (preparation holes) are formed on the step plate 2 side.

In this embodiment, the indoor staircase is assembled by attaching the step boards 2 and riser boards 3 to the side boards 1 fixed to the house structure. The assembly procedure for assembling the indoor staircase in this embodiment is not limited, but it is common to assemble the step boards 2 and riser boards 3 to the side boards 1 in order from the bottom up.

That is, the first step riser 3 is placed along the front surface of the first step vertical portion 13 of both side panels 1, and the step panel 2 is placed on the horizontal portion of the first step while fitting the upper edge of the first step riser 3 into the fitting groove 22. At this time, if necessary, adhesive is used to adhere the upper edge of the riser 3 to the fitting groove 22 of the step panel 2, and the riser 3 is temporarily fixed to the horizontal portion 12 of the side panel 1. Furthermore, if necessary, adhesive or double-sided tape is used to temporarily fix the step panel 2 to the horizontal portion 12 of the side panel 1.

Next, the first step 2 is screwed to both side panels 1, but before that, the second step riser 3 is placed on the front of the second step vertical portion 13 of both side panels 1, and the lower end of the riser 3 is inserted in the gap between the rear end face of the first step 2 and the second step vertical portion 13 of both side panels 1. Note that before the screws are attached, the gap is slightly larger than the thickness of the riser 3, and the lower end of the riser 3 is loosely fitted in the gap.

Next, insert the shaft 62 of the screw 6 from the underside of the first step plate 2 through the countersunk recess 5 in the side plate 1 into the tip hole 4, and then rotate the screw 6 to screw the tip of the shaft 62 through the tip hole 4 into the back side of the step plate 2.

In this embodiment, the inner diameter of the tip hole 4 is larger than the outer diameter of the shaft 62 of the screw 6, so that when the shaft 62 of the screw 6 is screwed into the step plate 2 a predetermined amount and the head 61 of the screw 6 abuts and engages with the seat surface 51 of the countersunk recess 5, the screw 6, which is then rotated, does not move forward along the axial direction itself, but is screwed into the step plate 2 while drawing the step plate 2 toward the screw 6 (downward). This pulling movement of the step plate 2 draws the step plate 2 to the horizontal portion 12 of the side plate 1, and the step plate 2 can be reliably fixed in a state where it fits snugly against the horizontal portion 12.

Furthermore, in this embodiment, the tip hole 4 is inclined toward the front, so that by rotating the screw 6, the step plate 2 is pulled rearward along the horizontal portion 12, and the rear end face of the first step plate 2 can be securely fixed in a state where it is pressed against the vertical portion 13 of the second step via the riser plate 3 of the second step with no gaps.

In this way, the step plate 2 is pulled and moved by the screw 6, so that the step plate 2 can be reliably fixed in the desired position of the horizontal portion 12 and vertical portion 13 of the side plate 1.

If necessary, the riser plate 3 may be fixed to the side panels 1 and step panels 2 using fasteners such as screws or nails.

Then, in the same manner, the step panels 2 and riser panels 3 are fixed to the horizontal parts 12 and vertical parts 13 of the side panels 1 from the second step onwards, completing the assembly of the indoor staircase.

As described above, the stairs of this embodiment are constructed from the back side of the stairs using a back-side work method, so that fasteners such as the screws 6 are not exposed on the front side, resulting in good design. Furthermore, the screws 6 can be reliably guided to the desired position simply by inserting them into the pilot holes 4, making it easy to position the screws 6, and once inserted into the pilot holes 4, screwing the screws 6 into the step plate 2 also allows the above-mentioned pulling effect to be used to easily attach the step plate 2 with good positional accuracy.

In addition, in this embodiment, the step plate 2 is fixed directly to the side plate 1 with screws 6 without using brackets or brackets, which reduces the number of parts, simplifies parts management, and simplifies the structure.

In addition, in this embodiment, a countersink recess 5 is formed on the inner surface of the side plate of the tip hole 4, and the head of the screw 6 abuts and engages with the seat surface 51 of the countersink recess 5. This ensures that the step plate 2 can be pulled and moved as described above, and also prevents the screw 6 from being driven in more than necessary, thereby reliably preventing problems such as the tip of the screw protruding from the surface (decorative surface) of the step plate 2.

In this embodiment, as described above, it is preferable to use a screw 6 in which the bottom surface of the head 61 (i.e., the surface facing the seat 5) is formed as a flat surface perpendicular to the axis of the shaft 62 so that the head 61 of the screw 6 can be reliably engaged with the seat 51 of the countersunk recess 5. Specifically, truss screws and trumpet screws are suitable for use as the screw 6, and it is particularly preferable to use truss screws. However, in this embodiment, other screws, such as flexible screws, can also be used.

In addition, in this embodiment, the head 61 of the screw 6 can be securely stored within the countersunk recess 5, so the head 61 of the screw 6 does not protrude from the back side of the stairs (the inner surface of the side panel), and this reliably prevents problems such as the protruding portion interfering with the staircase assembly work on the back side of the stairs, making the staircase assembly work efficient and smooth. Furthermore, because the head of the screw 6 does not protrude from the inner surface of the side panel, when applying decorative finishes to the inner surface of the steps, such as when using under-stair storage, interior materials (decorative materials) etc. can be attached to the inner surface of the steps without hindrance, further improving convenience.

However, in the present invention, it is not necessary to form the countersunk recess 5 in a size that can accommodate the entire head 61 of the screw 6 (fixing device). The countersunk recess 52 may be formed in a size that can accommodate only a portion of the head 61, with the remaining portion of the head 61 protruding from the countersunk recess 5.

In the above embodiment, the screw 6 is used as a fastener, but the present invention is not limited to this. Other mechanical or physical fasteners, such as nails or screw nails, may be used. When a nail or the like is used, the pulling effect of the step board 2 cannot be obtained, but when the nail or the like is driven into the pilot hole 4, the nail or the like can be guided by the pilot hole 6, so the nail or the like can be positioned reliably, and the step board installation work can be performed easily and reliably.

In the above embodiment, the tip hole 4 is formed so as to penetrate from the inner surface of the side plate to the horizontal portion (upper end surface) 12, but this is not limited thereto. In the present invention, the tip hole 4 may be formed so as to be non-penetrating, with its upper end portion (horizontal portion 12 side) closed and only its lower end portion (side of the inner surface of the side plate) open.

In addition, in the above embodiment, the tip hole 4 is formed as a blind hole with an inner diameter larger than the outer diameter of the shaft 62 of the screw 6, but this is not limited thereto, and in the present invention, the inner diameter of the tip hole 4 may be formed smaller than or approximately the same as the outer diameter of the shaft of the fastener. However, if the upper end of the tip hole 4 is closed or the inner diameter is made small, the pulling effect of the step plate 2 cannot be expected, so it is preferable to form the tip hole 4 as a through hole (large diameter hole) as in the above embodiment.

In the above embodiment, the step mounting structure of the present invention is described as being applied to a straight staircase, but this is not limited thereto, and the step mounting structure of the present invention can also be applied to a spiral staircase.

For example, the staircase shown in FIG. 6 is constructed by combining a straight staircase S1 and a spiral staircase S2. As in the above embodiment, the straight staircase S1 has two pilot holes 4 formed in each of the two side panels 1 fixed to the house structure 9 such as a support, corresponding to each horizontal section 12. On the other hand, in the spiral staircase S2, of the two side panels fixed to the house structure 9, the inner panel 1a located on the inside has a shorter length in the front-to-rear direction (length of the horizontal section 12) than the outer panel 1b located on the outside. In this spiral staircase S2, as in the above embodiment, pilot holes 4 and countersunk recesses 5 are formed in the inner panel 1a and outer panel 1b, so that the staircase can be assembled in the same way as in the above embodiment.

Here, the working space around the inner plate 1a on the back side of the spiral staircase S2 is particularly small, and the structure is complicated with many intertwined parts, so the work of attaching the step 2 to the inner plate 1a on the inside of the staircase places a great burden on the worker. Even on the inside of the spiral staircase where work is difficult, with the step attachment structure of this embodiment, the step 2 can be easily and precisely fixed to the inner plate 1a simply by inserting the screw 6 into the tip hole 4 and screwing it in. Furthermore, no braces or brackets are required, and the structure is simplified, further improving its usefulness. The work of attaching the step 2 to the outer plate 1b can also be performed in the same way as in the above embodiment.

In the above embodiment, the step mounting structure of the present invention is applied to each horizontal portion 12 of a pair of side panels 1, but the present invention is not limited to this and it is sufficient that the step mounting structure of the present invention is applied to at least one horizontal portion 12 of the side panel 1. For example, the step mounting structure of the present invention may be applied to only one of the horizontal portions 12 of one of the pair of side panels 1, or may be applied to only the horizontal portion of the inner panel 1a of a spiral staircase.

In the above embodiment, the present invention has been described as being applied to a tiered staircase with both sides closed by walls or the like, but the present invention is not limited to this and can also be applied to a tiered staircase with all or part of one side or all or part of both sides open.

In the above embodiment, the step mounting structure of the present invention is described as being applied to a stepped staircase with step plates and risers, but the present invention is not limited to this. It can also be applied to stringer stairs, etc., where only the step plates are attached to the side panels and there are no risers.

Furthermore, in the above embodiment, an example was given in which both side panels 1 are configured as step-like side panels for a tiered staircase or the like, but this is not limited thereto, and in the present invention, it is sufficient that at least one of the pair of side panels is configured as a step-like side panel. For example, in the present invention, one of the pair of side panels may be configured as a step-like side panel, and the other may be configured as a side panel for a decorative staircase (step support member), etc.

Needless to say, in the present invention, the number of tip holes 4 formed in one horizontal portion 12 of the side plate 1 is not limited.

The staircase step mounting structure of this invention can be suitably applied to tiered staircases in ordinary houses such as detached houses.

1: Side plate 1a: Inner plate 1b: Outer plate 12: Horizontal portion 13: Vertical portion 2: Step plate 3: Rise plate 4: Tip hole 5: Counterbore recess 51: Seat surface 6: Screw (fixing device)
61: Head 62: Shaft S1: Direct staircase S2: Circular staircase

Claims (10)

A staircase step mounting structure having a pair of side panels arranged at an interval and a step panel installed on a horizontal portion provided on the side panels,
A tip hole is formed which extends linearly from the inner surface of the side plate toward the horizontal portion and whose upper end is inclined outwardly with respect to the lower end,
A staircase step mounting structure characterized in that the step is fixed to the side plate by positioning the head of a fixing device, the head being provided at the base end of the shaft, at the lower end side of the tip hole, and the tip side of the shaft penetrating the side plate through the tip hole, thereby fixing the step to the side plate. A countersunk recess is provided in the side plate in correspondence with a lower end side of the tip hole, and a head of the fixing tool is disposed in the countersunk recess;
2. The staircase step mounting structure according to claim 1, wherein the head abuts and engages with a seat surface of the countersunk recess. The staircase step mounting structure according to claim 2, in which the head of the fastener is housed within the countersunk recess. The staircase step mounting structure according to claim 2 or 3, in which the head of the fastener is disposed in surface contact with the seat surface of the countersunk recess. The staircase step mounting structure according to any one of claims 1 to 4, in which the inner diameter of the tip hole is larger than the outer diameter of the shaft of the fastener. The fixing device is constituted by a screw,
6. A staircase step mounting structure according to claim 5, wherein an upper end of said tip hole is open to a horizontal portion of said side plate. A vertical portion extending upward is provided at a rear end of the horizontal portion of the side plate,
7. A staircase step mounting structure according to claim 6, wherein said tip hole is formed so that its upper end is inclined forward with respect to its lower end. The staircase step mounting structure of claim 7, in which a riser plate is disposed along the front surface of the vertical portion, and the lower end of the riser plate is interposed between the rear end surface of the step plate and the vertical portion. The staircase step mounting structure described in any one of claims 1 to 8 is applied to a straight staircase. The staircase step mounting structure described in any one of claims 1 to 8 is applied to a spiral staircase.

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