Spiral staircase

Abstract

To provide a spiral staircase that has a small number of kinds of parts and a small number of parts that make up a spiral staircase and is easy to assemble.SOLUTION: When forming a spiral staircase in which steps are arranged in a spiral shape around an erected core column, spacer blocks are used and positioned so as to be erected in a vertical direction between neighboring steps.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a spiral staircase. [Background technology]

[0002] Spiral staircases are installed inside and outside buildings and are used to ascend and descend between upper and lower floors or between large steps. Spiral staircases are usually assembled by arranging the treads in a spiral shape around a vertical core column. Therefore, the staircase occupies a small area and the dead space is relatively small.

[0003] Patent Document 1 describes a spiral staircase in which a core column is formed by a group of core column units formed by stacking core column units concentrically in the up-down direction over multiple stages, and treads are arranged in a spiral shape over multiple stages around the group of core column units. The spiral staircase described in Patent Document 1 has an inner end of each tread sandwiched between two core column units above and below, and is equipped with a tread positioning means that determines the distance angle between two adjacent treads around the core column.

[0004] However, this positioning means required pins with protrusions to be inserted into holes provided in the inner wall of the hollow section of the hollow cylindrical core column unit, tread washers, and a nut body that is screwed into the male thread of the core body to be tightened, and the spiral staircase had a large number of different parts and a complex structure (see Figures 6 to 9 of Patent Document 1).

[0005] In addition, because there are many different types and numbers of parts, and tasks such as part placement and tightening with nuts are required, assembly is not easy, takes a lot of time, and requires the skills of the worker. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2005-220656 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present invention has been made in consideration of the above-mentioned problems with the conventional technology, and has as its object to provide a spiral staircase that has a small variety and number of parts that make up the spiral staircase and is easy to assemble. [Means for solving the problem]

[0008] The inventors of the present invention have conducted extensive research to solve the above problems, and have discovered that when forming a spiral staircase in which treads are arranged in a spiral shape around a standing core pillar, by using spacer blocks and arranging the spacer blocks vertically between adjacent treads, the number and types of parts required for assembling the spiral staircase can be reduced, and the assembly of the spiral staircase can be made easier, leading to the completion of the present invention.

[0009] That is, the present invention includes the following aspects. [1] A spiral staircase in which the steps are arranged in a spiral shape around a central pillar. A spacer block is disposed between adjacent step plates so as to stand vertically. The step has a core column insertion hole at the center end of the staircase, a step nose outer peripheral column insertion hole at the step nose portion at the outer end of the staircase, and a step bottom outer peripheral column insertion hole at the step bottom portion at the outer end of the staircase, The spacer block has, at one end, a core column insertion portion having a core column insertion hole, and at the other end, a peripheral column insertion portion having a peripheral column insertion hole, The core pillar insertion hole of the step plate located on the upper side, the core pillar insertion hole of the spacer block, and the core pillar insertion hole of the step plate located on the lower side are arranged to overlap, and the core pillars are inserted into the three overlapping core pillar insertion holes, The step nose peripheral post insertion hole of the step board located on the upper side, the peripheral post insertion hole of the spacer block, and the step end peripheral post insertion hole of the step board located on the lower side are arranged to overlap, and peripheral posts are inserted into the step nose peripheral post insertion hole, the peripheral post insertion hole, and the step end peripheral post insertion hole, which are overlapped, A clamp is disposed between the step plate located on the upper side and the step plate located on the lower side of the outer peripheral post inserted into the step bottom portion outer peripheral post insertion hole of the step plate located on the upper side, and the clamp places the step plate located on the upper side and supports the step plate located on the upper side. spiral staircase. [2] The spiral staircase according to aspect [1], wherein the core column and the outer perimeter columns are the same pipe. [3] A first bracket is disposed on the perimeter post; A spiral staircase according to aspect [1] or [2], in which a first extension plate for extending from the outer periphery of the spiral staircase is placed on the first bracket, and the first extension plate is extended from the outer periphery of the spiral staircase. [4] The first extension plate has at least one outer periphery post insertion hole, The spiral staircase according to aspect [3], wherein the outer perimeter column equipped with the first bracket is inserted into the outer perimeter column insertion hole. [5] The first extension plate has at least two outer peripheral post insertion holes, A spiral outer column located on the outer periphery of the spiral staircase is inserted into the outer periphery column insertion hole in which the outer periphery column equipped with the first bracket is not inserted, A second bracket is disposed on the outer helical post; A spiral staircase as described in aspect [3] or [4], wherein a second extension plate is placed on the second bracket and extends from the first extension plate. [6] The spiral staircase according to any one of aspects [1] to [5], which is a temporary staircase or a display stand. Effect of the Invention

[0010] The main components of the spiral staircase of the present invention are only the treads, spacer blocks, core columns, outer perimeter columns, and clamps. Since there are only a few types and number of parts, assembly is easy and can be completed in a short time, and the worker does not need specialized skills.

[0011] If the core column used at the center of the spiral staircase of the present invention and the outer peripheral columns used on the outer periphery of the spiral staircase are made of the same pipe, the number of parts can be further reduced.

[0012] In particular, the spiral staircase of the present invention can be formed by simply stacking adjacent upper and lower treads with spacer blocks in between, so it can be easily installed as a temporary staircase in evacuation shelters in the event of a disaster or at construction sites, and can be easily removed when it is no longer needed.

[0013] In addition, the spiral staircase of the present invention can be equipped with shelves around the periphery of the spiral staircase by extending the extension plate from the periphery of the spiral staircase using brackets, and can form stairs of any shape. Such a spiral staircase with a horizontal expansion can be used, for example, as a three-dimensional stand for displaying products, plants, etc. by placing them on the extended shelves. [Brief description of the drawings]

[0014] [Figure 1] 1 is a schematic diagram showing the appearance of a spiral staircase according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a top view of a spiral staircase according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a partial layout diagram of a spiral staircase according to an embodiment of the present invention. [Figure 4] FIG. 4 is an assembly diagram of the parts shown in FIG. [Diagram 5] FIG. 1 is a schematic diagram showing the appearance of a spiral staircase according to one embodiment of the present invention, which is provided with an extension plate. [Figure 6] FIG. 2 is a top view of a spiral staircase with an extension plate according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described, however, the present invention is not limited to the following embodiment.

[0016] 《Spiral staircase》 The spiral staircase of the present invention has treads, each of which has a hole for inserting a core post formed at its end toward the center of the staircase, arranged in a spiral shape around an upright core post.

[0017] <Spiral staircase components> The spiral staircase of the present invention can be formed using only the following main components: treads, spacer blocks, core columns, outer perimeter columns, and clamps. The spiral staircase of the present invention has spacer blocks arranged vertically between adjacent treads.

[0018] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0019] Fig. 1 is a schematic view of the exterior of a spiral staircase 100 according to an embodiment of the present invention, and Fig. 2 is a top view of the spiral staircase 100 according to an embodiment of the present invention. The spiral staircase 100 shown in Fig. 1 is formed by a tread 1, a spacer block 2, a core column 3, an outer peripheral column 4, a clamp 5 (not shown in the drawing), and a fixed base 6.

[0020] The spiral staircase 100 is configured by arranging roughly triangular treads 1, each with a core post insertion hole formed at the end of the center of the staircase, in a spiral shape around an erect core post 3. The spiral staircase 100 is configured by inserting the core post 1 into the core post insertion hole of the treads 1, so that multiple treads 1 are deployed around the core post 1 and arranged in a spiral shape. The spiral staircase 100 also has peripheral posts 4 inserted into the step nosing peripheral post insertion holes and step bottom peripheral post insertion holes formed at the outer staircase ends of the treads 1. The core post 1 and peripheral post 4 are each provided with a fixed base 6 at their lower ends.

[0021] (Stepping board) The steps, which are components of the spiral staircase of the present invention, form a spiral-shaped staircase when the spiral staircase is formed by positioning the second step relative to the first step in a state where the second step is rotated a specified angle around the core in the same direction or opposite direction to the movement of the clock hands.

[0022] The shape of the step, which is a component of the spiral staircase of the present invention, is not particularly limited as long as it can form a spiral, and is generally approximately fan-shaped, widening from the center end of the spiral staircase, which is located at the center of the spiral staircase, to the outer end of the spiral staircase, which forms the outer periphery of the spiral staircase. The shape of the step, which is a component of the spiral staircase of the present invention, may be, for example, approximately triangular, but is not limited to this.

[0023] When the step, which is a component of the spiral staircase of the present invention, is substantially polygonal, the corners may be sharp or rounded by rounding, etc. Also, the corners may be slightly bulged into a circular shape.

[0024] Furthermore, the treads, which are components of the spiral staircase of the present invention, need only become wider from the end at the center of the staircase towards the outside end of the staircase which forms the outer periphery of the spiral staircase, but the increase in width may be formed by straight lines only, a combination of straight lines and curves, or by curves only.

[0025] The step, which is a component of the spiral staircase of the present invention, has at least three holes. Specifically, it has at least a hole for inserting a core column at the end of the spiral staircase on the center side, a hole for inserting a nosing outer peripheral column at the nosing part which is the outer end of the staircase, and a hole for inserting a bottom outer peripheral column at the bottom of the staircase which is the outer end of the staircase. It is sufficient for the step, which is a component of the spiral staircase of the present invention, to have at least these three holes, and it may have other holes.

[0026] Here, the nosing refers to the part of the tread on the front side when going up a spiral staircase, and the bottom refers to the part of the tread on the back side when going up a spiral staircase.

[0027] The shapes and sizes of the core column insertion hole, the stair nose peripheral column insertion hole, and the stair bottom peripheral column insertion hole are not particularly limited. They can be set appropriately according to the outer shape and thickness of the core column and peripheral column to be inserted into each hole. The shapes and sizes of the core column insertion hole, the stair nose peripheral column insertion hole, and the stair nose peripheral column insertion hole may be the same or different. If these are made the same shape and size, and the core column and peripheral column are made the same, the number of parts can be reduced.

[0028] There is no particular limitation on the material for forming the tread. It can be appropriately selected depending on the use of the spiral staircase. For example, if the spiral staircase is for people to ascend and descend, a material with strength and rigidity is selected. Also, if the spiral staircase is used to display products, plants, etc., it is sufficient to use a material that is strong enough to withstand the weight of the objects to be displayed.

[0029] Examples of materials for forming the tread include metals such as steel and aluminum, plastic foams consisting of an outer skin and a foam core, etc. When the treads are made of foam, it is possible to reduce the weight of the spiral staircase.

[0030] The width of the staircase's outer end (the distance between the hole for inserting the outer staircase nose column and the hole for inserting the outer staircase bottom column) will be approximately the outer width of the stairs when the spiral staircase is assembled. For this reason, it is desirable to set the width of the staircase's outer end as appropriate depending on the purpose of the spiral staircase and the installation location. The width of the staircase's outer end may be the same for each tread, or it may be different. If you wish to change the width of the stairs, for example to create a landing, simply make the width of the staircase's outer end of the tread used in that location different from the other treads.

[0031] The thickness of the step is not particularly limited. It can be set appropriately to meet the required strength depending on the material of the step. From the viewpoint of facilitating the formation of the spiral staircase, it is preferable that the thickness is constant, but it does not have to be constant, and it can be made thicker in the necessary parts from the viewpoint of reinforcing the strength.

[0032] Fig. 3 shows a partial layout of a spiral staircase according to one embodiment of the present invention. In the embodiment shown in Fig. 3, the tread 1 is in a generally triangular shape that gradually widens from the center end of the staircase to the outer end of the staircase, and has a constant thickness. The center end of the staircase has a hole 11 for inserting a core column, the nose of the outer end of the staircase has a hole 12 for inserting a nose outer peripheral column, and the bottom of the outer end of the staircase has a hole 13 for inserting a bottom outer peripheral column.

[0033] (Spacer block) The spacer blocks, which are components of the spiral staircase of the present invention, are arranged vertically between the adjacent treads. By using the spacer blocks, the spiral staircase of the present invention can be assembled without the need for pins, screws, nuts, and other parts that were previously required for assembling a spiral staircase.

[0034] The spacer block has at one end a core column insertion portion having a core column insertion hole, and at the other end a peripheral column insertion portion having a peripheral column insertion hole.

[0035] The shapes and sizes of the core post insertion holes and the peripheral post insertion holes formed in the spacer block are not particularly limited and can be set appropriately depending on the outer shapes and thicknesses of the core posts and peripheral posts to be inserted into the respective holes.

[0036] The shape and size of the core post insertion hole and the outer peripheral post insertion hole formed in the spacer block may be the same as or different from the core post insertion hole and the stair nosing outer peripheral post insertion hole formed in the tread. It is preferable that the core post insertion hole of the spacer block has the same shape and size as the core post insertion hole of the tread, and the outer peripheral post insertion hole of the spacer block has the same shape and size as the stair nosing outer peripheral post insertion hole of the tread, because this can suppress rattling of the assembled spiral staircase.

[0037] The material for forming the spacer blocks is not particularly limited. It can be appropriately selected depending on the use of the spiral staircase. For example, in the case of a spiral staircase for people to ascend and descend, a material with strength and rigidity is selected. In the case of a spiral staircase used to display products, plants, etc., it is sufficient that the material has the strength to withstand the weight of the objects to be displayed. In addition, the material for forming the spacer blocks may be the same as or different from the material for the treads described above.

[0038] The height of the spacer blocks will be the height of the spiral staircase when it is assembled. Therefore, it is desirable to set the height of the spacer blocks appropriately depending on the purpose of the spiral staircase and the installation location. The height of the spacer blocks may be the same or different for each spacer block. If you want to change the height of the stairs in a certain place, you can simply make the height of the spacer block used in that place different from the height of the other spacer blocks.

[0039] The thickness of the spacer block is not particularly limited. It can be set appropriately to meet the required strength depending on the material of the spacer block. From the viewpoint of the strength of the spiral staircase, it is preferable that the thickness of the spacer block is constant, but it does not have to be constant, and it can be made thicker in the necessary parts from the viewpoint of reinforcing the strength.

[0040] In the partial layout diagram of a spiral staircase according to one embodiment of the present invention shown in Figure 3, the spacer block 2 has at one end a core column insertion portion 21 with a core column insertion hole 22, and at the other end a peripheral column insertion portion 23 with a peripheral column insertion hole 24.

[0041] (core pillar) The core pillar, which is a component of the spiral staircase of the present invention, is inserted into the core pillar insertion hole of the step board and the core pillar insertion hole of the spacer block, and is erected at the center of the spiral staircase. In other words, the core pillar is erected at the center of the spirally arranged step boards, and is located at the center of the spiral staircase.

[0042] The shape of the core pillar is not particularly limited. For example, it may be a hollow long tubular material or a solid long material. In addition, the outer shape is not particularly limited. For example, it may be a circle or a square.

[0043] The material for forming the core pillar is not particularly limited. It can be appropriately selected depending on the use of the spiral staircase. For example, if the spiral staircase is for people to ascend and descend, a material with strength and rigidity is selected. Also, if the spiral staircase is used to display products, plants, etc., it is sufficient to select a material that has the physical properties required for the objects to be displayed.

[0044] Examples of materials for forming the core pillar include steel and aluminum alloy. In order to reduce the weight of the spiral staircase, a core pillar made of synthetic resin may be used. In this case, fiber-reinforced plastic is preferable from the viewpoint of strength. A core pillar made of synthetic resin will not corrode due to rust or the like, and is also water-resistant.

[0045] The thickness of the core post is not particularly limited and can be appropriately set depending on the size and shape of the core post insertion hole formed in the footboard and the core post insertion hole in the spacer block.

[0046] The length of the core pillar is not particularly limited and can be set appropriately depending on the height of the spiral staircase to be formed.

[0047] The core pillar, which is a component part of the spiral staircase of the present invention, can also be made from a commercially available single pipe that is used as scaffolding at construction sites.

[0048] In the spiral staircase 100 according to one embodiment of the present invention shown in Figure 1 and the partial layout diagram of the spiral staircase according to one embodiment of the present invention shown in Figure 3, the core column 3 is cylindrical and is inserted into the core column insertion hole 11 formed at the end of the tread 1 on the staircase center side and the core column insertion hole 22 in the core column insertion portion 21 of the spacer block 2.

[0049] (Periphery pillars) The peripheral columns, which are components of the spiral staircase of the present invention, are inserted into the stair nosing peripheral column insertion holes, the stair bottom peripheral column insertion holes, and the spacer block peripheral column insertion holes, and are erected on the outer periphery of the spiral staircase. That is, the peripheral columns are erected near the outer ends of the spirally arranged treads, and are arranged in a circle near the outer periphery of the spiral staircase.

[0050] The shape of the peripheral post is not particularly limited. For example, it may be a hollow long tubular material or a solid long material. The outer shape is also not particularly limited, and may be, for example, a circle or a square.

[0051] The material for forming the outer perimeter columns is not particularly limited. It can be appropriately selected depending on the use of the spiral staircase. For example, if the spiral staircase is for people to ascend and descend, a material with strength and rigidity is selected. Also, if the spiral staircase is used to display products, plants, etc., it is sufficient to select a material that has the physical properties required for the objects to be displayed.

[0052] Examples of materials for forming the outer perimeter columns include steel and aluminum alloy materials. In order to reduce the weight of the spiral staircase, outer perimeter columns made of synthetic resin may be used. In this case, fiber-reinforced plastic is preferable from the viewpoint of strength. Outer perimeter columns made of synthetic resin are not corroded by rust and are also water resistant.

[0053] The thickness of the peripheral post is not particularly limited, and can be set appropriately according to the size and shape of the step nosing peripheral post insertion hole, step bottom peripheral post insertion hole, and the peripheral post insertion hole of the spacer block formed in the tread.

[0054] The length of the outer perimeter columns is not particularly limited and can be set appropriately according to the height of the spiral staircase to be formed or from the viewpoint of the safety of the spiral staircase.

[0055] The outer perimeter columns, which are components of the spiral staircase of the present invention, can be made from commercially available single pipes that are used as scaffolding at construction sites.

[0056] In the spiral staircase 100 according to one embodiment of the present invention shown in Figure 1 and the partial layout diagram of the spiral staircase according to one embodiment of the present invention shown in Figure 3, the outer perimeter column 4 is cylindrical and is inserted into the stair nosing outer perimeter column insertion hole 12 and the stair bottom outer perimeter column insertion hole 13 formed at the outer end of the staircase of the tread 1, as well as the outer perimeter column insertion hole 24 of the outer perimeter column insertion part 22 of the spacer block 2.

[0057] (Clamp) The clamp, which is a component of the spiral staircase of the present invention, is placed directly under the treads in the spiral staircase, where the upper tread is placed and supported. The clamp is placed at the required location of the outer perimeter column by tightening and fixing it to the outer perimeter column.

[0058] The shape of the clamp is not particularly limited. It is sufficient if it has the function of fastening the outer perimeter column and can fix itself. Among them, a C-type clamp is preferable.

[0059] The material of the clamp is not particularly limited. For example, it may be metal, plastic, or ceramic. Plastic such as fiber-reinforced plastic can contribute to water resistance and weight reduction.

[0060] The size of the clamp is not particularly limited, as long as it can support the upper step plate by placing it thereon.

[0061] In the partial layout diagram of a spiral staircase according to one embodiment of the present invention shown in Figure 3, the clamp 5 is fastened and fixed to the outer perimeter column 4, and the outer perimeter column 4 is inserted into the step-end outer perimeter column insertion hole 13 formed at the outer end of the staircase of the tread 1, so that the clamp 5 is positioned directly below the tread 1, on which the upper tread 1 is placed and which supports the upper tread 1.

[0062] (Fixed base) In the spiral staircase of the present invention, the fixed base is an optional part. The fixed base is attached to the lower end of each of the core column and the outer periphery column in order to erect them.

[0063] The shape of the fixed base is not particularly limited as long as it allows the core column and the outer peripheral columns to be erected. For example, if the core column is a hollow cylinder, it may have a disk-shaped or square seat plate on which a core body having an outer diameter substantially equal to its inner diameter is erected.

[0064] In the spiral staircase 100 according to one embodiment of the present invention shown in FIG. 1, the partial layout diagram shown in FIG. 3, and the assembly diagram shown in FIG. 4, a fixed base 6 having a rectangular seat plate on which a core body is erected is equipped as a separate part at the lower end of each of the core column 3 and the peripheral column 4.

[0065] In the spiral staircase of the present invention, the fixed base is an optional part and may not be necessary if the lower ends of the core column and peripheral columns are integrally provided with elements for stably erecting them.

[0066] <Assembly procedure and structure of a spiral staircase> An example of an assembly procedure for a spiral staircase is shown below with reference to the drawings, and the structure of the spiral staircase is explained. Figure 3 is a partial layout diagram of a spiral staircase according to one embodiment of the present invention, and Figure 4 is an assembly diagram of the parts shown in Figure 3.

[0067] As shown in Fig. 3, first, one core column 3 and two peripheral columns 4 are erected. Specifically, fixed bases 6 for erecting the core column 3 and the peripheral columns 4 are attached to the lower ends of each of them.

[0068] The fixed base 6 shown in Figures 3 and 4 is a fixed base with a square base plate on which a core body is erected. When erecting the core column 3 and the two peripheral columns 4, the base plate of the fixed base 6 is fixed to the ground or floor surface where the spiral staircase is to be installed, for example, by anchor bolts (not shown), and then the core body of the fixed base 6 is inserted into the lower end of each of the core column 3 and the peripheral columns 4, which are hollow cylinders.

[0069] Next, to form the first step of the spiral staircase, the spacer block 2 is erected vertically. Specifically, the core column 3 is inserted from its upper end into the core column insertion hole 22 of the spacer block 2, and at the same time, the outer peripheral column 4 is inserted from its upper end into the outer peripheral column insertion hole 24 of the spacer block 2, and the spacer block 2 for the first step is erected vertically on the core column 3 and the outer peripheral column 4.

[0070] Next, clamps 5 are fixed to the outer periphery columns 4 through which the spacer blocks 2 have not been inserted. The clamps 5 are fastened and fixed to the outer periphery columns 4 at a position that is approximately the same height as the first tier of spacer blocks 2 that have been erected.

[0071] Next, the tread 1, which will be the first step of the spiral staircase, is attached to the core column 3 and two peripheral columns 4 by inserting the core column 3 from its upper end into the core column insertion hole 11 of the tread 1, and at the same time, inserting the upper end of the peripheral column 4, which has been inserted into the peripheral column insertion hole 24 of the spacer block 2 of the first step, into the step nosing peripheral column insertion hole 12 of the tread 1, and at the same time, inserting the upper end of the peripheral column 4, to which the clamp 5 is fixed, into the step toe peripheral column insertion hole 13 of the tread 1.

[0072] Figure 4 shows an assembly diagram of the first step of the spiral staircase constructed using the above steps.

[0073] Next, to form the second step of the spiral staircase, the spacer block 2 of the second step is erected vertically on the tread 1 of the first step. Specifically, the core column 3 is inserted from its upper end into the core column insertion hole 22 of the spacer block 2, and at the same time, the outer periphery column 4 (the outer periphery column 4 to which the clamp 5 of the first step is fixed) is inserted from its upper end into the outer periphery column insertion hole 13 of the tread 1 of the first step into the outer periphery column insertion hole 24 of the spacer block 2, and the spacer block 2 of the second step is erected vertically on the tread 1 of the first step.

[0074] Next, the second tier clamps 5 are fixed to the new peripheral columns 4. The second tier clamps 5 are fastened and fixed to the new peripheral columns 4 at a position that is approximately the same height as the second tier spacer blocks 2 that have been erected.

[0075] Next, the tread 1 for the second step of the spiral staircase is attached on top of the erected spacer block 2 for the second step so that the core column 3 is inserted from its upper end into the core column insertion hole 11 of the tread 1, and at the same time, the upper end of the outer peripheral column 4 inserted into the outer peripheral column insertion hole 24 of the spacer block 2 for the second step is inserted into the step nosing outer peripheral column insertion hole 12 of the tread 1, and at the same time, the upper end of another outer peripheral column 4 to which the second step clamp 5 is fixed is inserted into the step toe outer peripheral column insertion hole 13 of the tread 1.

[0076] In a spiral staircase assembled in this manner, as shown in Figure 1, the surface of the bottom of the first tread, the spacer block of the second step, and the back surface of the nosing of the second tread are connected by inserting the core column and outer peripheral columns, and the first and second treads are positioned at a specified angle around the core column.

[0077] In other words, the core column insertion hole of the upper step board, the core column insertion hole of the spacer block, and the front column insertion hole of the lower step board are arranged to overlap, and the core columns are inserted into the three overlapping core column insertion holes.

[0078] In addition, the stair nosing outer peripheral column insertion hole of the upper tread, the outer peripheral column insertion hole of the spacer block, and the step toe outer peripheral column insertion hole of the lower tread are arranged to overlap, and outer peripheral columns are inserted into the overlapping stair nosing outer peripheral column insertion hole, outer peripheral column insertion hole, and step toe outer peripheral column insertion hole.

[0079] In addition, a clamp is placed between the upper and lower step plates on the outer peripheral post inserted into the outer peripheral post insertion hole at the bottom of the upper step plate, and the upper step plate is placed on the clamp, thereby supporting the upper step plate.

[0080] In Figures 1 and 2, when ascending the spiral staircase, the second step is rotated a specified angle in the counterclockwise direction around the core post relative to the first step.

[0081] In the same way, by stacking the third step spacer block, the third step tread, the fourth step spacer block, the fourth step tread, and so on, a spiral staircase can be assembled in which the treads are arranged in a spiral shape around the core column.

[0082] In addition, in the spiral staircase of the present invention, the core column is inserted from the top end of the erected core column and peripheral column into the core column insertion hole of the tread, and the peripheral column is inserted into the step nosing peripheral column insertion hole and the step end peripheral column insertion hole to attach the tread. Therefore, if the spiral staircase is high and the core column and peripheral column are high, it may be difficult to attach the tread. In such a case, the core column and peripheral column may be divided instead of being one piece.

[0083] If the core column or outer perimeter column is of the split type, a predetermined number of treads can be attached to the core column to construct a spiral staircase for the predetermined number of treads, after which a person can climb the constructed spiral staircase, add more core columns or outer perimeter columns of the split type, and attach another predetermined number of treads.

[0084] "Spiral staircase with extension plate" The spiral staircase of the present invention may be a spiral staircase in which an extension plate extends from the outer periphery of the spiral staircase using a bracket. The extension plate can be used as a shelf extending outside the spiral staircase, for example, as a three-dimensional stand for displaying products, plants, etc. on the extended shelf.

[0085] Hereinafter, a spiral staircase with an extension plate will be described with reference to the drawings. Figure 5 is a schematic external view of a spiral staircase with an extension plate according to one embodiment of the present invention, and Figure 6 is a top view thereof.

[0086] <Components of a spiral staircase with extension plates> A spiral staircase with an extension plate includes, in addition to the main components of the spiral staircase of the present invention described above, namely, the treads, spacer blocks, core columns, outer peripheral columns, and clamps, an extension plate, a bracket on which the extension plate is supported, and a spiral outer column inserted into the extension plate.

[0087] In the spiral staircase with extension plates shown in Figures 5 and 6, a first bracket 71 is attached to each of the two outer peripheral columns of the spiral staircase of the present invention described above, and a first extension plate 81 is placed on each of the first brackets 71. In addition, a spiral outer column 9 is inserted into one first extension plate 81, a second bracket 72 is attached to the spiral outer column 9, and a second extension plate 82 is placed on the second bracket 72. In other words, the first extension plate is an extension plate that extends one step from the spiral of the spiral staircase described above, and the second extension plate is an extension plate that extends two steps from the spiral of the spiral staircase described above.

[0088] (First extension plate) In the case of a spiral staircase with an extension plate, when only one step is extended from the spiral of the above-mentioned spiral staircase of the present invention, the first extension plate used only needs to have at least one peripheral column insertion hole for the extension plate itself. The peripheral column of the above-mentioned spiral staircase is inserted into the peripheral column insertion hole. The first extension plate only needs to have at least one peripheral column insertion hole, and may have other holes.

[0089] The shape, material, size, thickness, etc. of the first extending plate are not particularly limited. Since the extending plate is used as a shelf for displaying products, plants, etc., there is no problem as long as it can withstand the weight of these objects.

[0090] The first extension plate may be the same as the step plate used in the spiral staircase of the present invention described above. The step plate used in the spiral staircase of the present invention has three holes, but only the necessary holes need to be used. If the first extension plate is the same as the step plate used in the spiral staircase of the present invention described above, the number of parts can be reduced.

[0091] If the first extension plate is the same as the tread used in the spiral staircase of the present invention described above, for example, the core post insertion hole of the first extension plate can be used to insert the outer perimeter post equipped with the first bracket into the core post insertion hole.

[0092] (Second extension plate)

[0093] When extending two steps from the spiral of the spiral staircase of the present invention, the second extension plate used has at least two outer perimeter column insertion holes, one for extending itself and one for extending the second extension plate. The outer perimeter column of the spiral staircase and the outer spiral column for extending the second extension plate are inserted into the two outer perimeter column insertion holes, respectively. The second extension plate only needs to have at least two outer perimeter column insertion holes, and may have other holes.

[0094] The shape, material, size, thickness, etc. of the second extending plate are not particularly limited. Since the extending plate is used as a shelf for displaying products, plants, etc., there is no problem as long as it can withstand the weight of these objects.

[0095] The second extension plate may be the same as the step plate used in the spiral staircase of the present invention described above. The step plate used in the spiral staircase of the present invention has three holes, but only the necessary holes need to be used. If the second extension plate is the same as the step plate used in the spiral staircase of the present invention described above, the number of parts can be reduced.

[0096] In the spiral staircase with the extension plate shown in FIG. 5 and FIG. 6, one second extension plate 82 extends from the spiral outer post 9 inserted into one first extension plate 81.

[0097] (First bracket) The first bracket, which is a component of the spiral staircase with an extension plate, is fixed to the outer perimeter column of the above-mentioned spiral staircase of the present invention and supports the first extension plate extending from the spiral staircase.

[0098] In other words, the first bracket is placed directly below the first extension plate, and the first extension plate located above is placed on the first bracket, which supports the first extension plate located above. The first bracket is placed at a necessary location of the outer perimeter column of the spiral staircase of the present invention by tightening and fixing the outer perimeter column.

[0099] The shape of the first bracket is not particularly limited as long as it has a function of fastening the outer peripheral column and can be fixed by itself. For example, L-shaped, triangular, square, I-shaped, etc. can be mentioned.

[0100] The material of the first bracket is not particularly limited. For example, it may be metal, plastic, or ceramic. Plastic such as fiber reinforced plastic can contribute to water resistance and weight reduction.

[0101] The size of the first bracket is not particularly limited as long as it can support the first extending plate located on the upper side and can receive the first extending plate located on the upper side.

[0102] In a spiral staircase with an extension plate according to one embodiment of the present invention shown in Figures 5 and 6, two first brackets 71 are fixed to two outer perimeter columns 4, respectively, and a first extension plate is placed on each of the first brackets 71.

[0103] (Second bracket) In the spiral staircase with the extension plate, the second bracket is for placing the second extension plate extending from the spiral staircase of the present invention by two steps. The second bracket is attached and fixed to the spiral outer column inserted into the first extension plate.

[0104] The shape, material, size, etc. of the second bracket are the same as those of the first bracket described above and are not particularly limited. In addition, the second bracket may be the same as or different from the first bracket.

[0105] In a spiral staircase equipped with an extension plate according to one embodiment of the present invention shown in Figures 5 and 6, a spiral outer column 9 is inserted into a first extension plate 81, a second bracket 72 is fixed to the spiral outer column 9, and a second extension plate 82 is placed on top of the second bracket 72.

[0106] (Spiral outer column) In a spiral staircase with an extension plate, the outer spiral column is inserted into a hole in the first extension plate to support the first extension plate and also to fix the second bracket.

[0107] The shape, material, thickness, length, etc. of the outer spiral column are the same as those of the outer peripheral columns of the spiral staircase of the present invention described above, and are not particularly limited. They can be appropriately selected according to the purpose of the spiral staircase. For example, if the spiral staircase is for people to ascend and descend, a material with strength and rigidity is selected. Also, if the spiral staircase is used to display products, plants, etc., a material with the physical properties required for the object to be displayed may be used.

[0108] <Assembly procedure and structure of a spiral staircase with extension plate> The spiral staircase with the extension plate is assembled in the same manner as the assembly procedure for the spiral staircase of the present invention described above. The first bracket is fixed to the outer perimeter post at the part where the extension plate is to be extended from the spiral.

[0109] Next, the first extension plate is attached to the outer peripheral column so that the outer peripheral column is inserted into the outer peripheral column insertion hole of the first extension plate from the upper end of the outer peripheral column to which the first bracket is fixed, and the first extension plate is placed on the first bracket so that the first extension plate is supported by the first bracket.

[0110] Therefore, a spiral staircase equipped with a first extension plate has a structure in which a first bracket is placed on the outer periphery column of the spiral staircase of the present invention, and a first extension plate for extending from the outer periphery of the spiral staircase is placed on the first bracket, so that the first extension plate extends from the outer periphery of the spiral staircase.

[0111] When a second extension plate is attached in addition to the first extension plate, the helical outer column is inserted into the outer periphery column insertion hole of the attached first extension plate, and the second bracket is fixed to the helical outer column. Next, the second extension plate is attached to the helical outer column so that the helical outer column is inserted into the outer periphery column insertion hole of the second extension plate from the upper end of the helical outer column to which the second bracket is fixed, and the second extension plate is placed on the second bracket and supported by the second bracket.

[0112] Therefore, a spiral staircase having a first extension plate and a second extension plate has a structure in which the second extension plate extends from the first extension plate, and using the first extension plate having at least two outer perimeter column insertion holes, a spiral outer column located on the outside of the outer perimeter of the spiral staircase is inserted into the holes not used to attach the first extension plate, a second bracket is placed on the spiral outer column, and the second extension plate is placed on the second bracket.

[0113] When the tread of the spiral staircase of the present invention described above is used as the first extension plate, for example, a spiral outer column located on the outside of the outer periphery of the spiral staircase may be inserted into at least one of the step nosing outer periphery column insertion holes or the step end outer periphery column insertion holes of the first extension plate, a second bracket may be arranged on the spiral outer column, and a second extension plate may be placed on the second bracket.

[0114] In the spiral staircase with extension plates according to one embodiment of the present invention shown in Figures 5 and 6, the same plates as the treads 2 forming the spiral staircase are used as the first extension plate 81 and the second extension plate 82. The first extension plate 81 has an outer peripheral column inserted into the core column insertion hole, and is placed on the first bracket 71 fixed to the outer peripheral column. Furthermore, the spiral outer column 9 is inserted into the step nosing outer peripheral column insertion hole or the step bottom outer peripheral column insertion hole of the first extension plate 81, and the second bracket 72 is fixed to the spiral outer column 9, and the second extension plate 82 is placed on the second bracket 72. [Industrial Applicability]

[0115] The spiral staircase of the present invention is easy to assemble because it has a small number of parts and types, and can be assembled in a short time without requiring specialized skills. Furthermore, if the core column used in the center of the spiral staircase of the present invention and the outer periphery columns used on the outer periphery of the spiral staircase are made of the same pipe, the number of parts can be further reduced, making it easier to assemble and reducing the cost.

[0116] In particular, the spiral staircase of the present invention can be formed by simply stacking adjacent upper and lower treads with spacer blocks in between, so it can be easily installed as a temporary staircase in evacuation shelters in the event of a disaster or at construction sites, and can be easily removed when it is no longer needed.

[0117] In addition, the spiral staircase of the present invention can be equipped with shelves around the periphery of the spiral staircase by extending the extension plate from the periphery of the spiral staircase using brackets, and can form stairs of any shape. Such a spiral staircase with a horizontal expansion can be used, for example, as a three-dimensional stand for displaying products, plants, etc. by placing them on the extended shelves. [Explanation of symbols]

[0118] 100, 200 spiral staircase 1 Tread 11. Hole for inserting core pillar 12 Hole for inserting outer stair nosing column 13 Hole for inserting outer perimeter column at bottom of step 2 Spacer blocks 21 Core pillar insertion site 22 Core column insertion hole 23 Peripheral column insertion section 24 Periphery column insertion hole 3 core pillar 4 Periphery pillars 5. Clamp 6 Fixed base 71 First Bracket 72 Second Bracket 81 First extension plate 82 Second extension plate 9 Spiral outer pillar

Claims

1. A spiral staircase in which the steps are arranged in a spiral shape around a central pillar. A spacer block is disposed between adjacent step plates so as to stand vertically. The step has a core column insertion hole at the center end of the staircase, a step nose outer peripheral column insertion hole at the step nose portion at the outer end of the staircase, and a step bottom outer peripheral column insertion hole at the step bottom portion at the outer end of the staircase, The spacer block has, at one end, a core column insertion portion having a core column insertion hole, and at the other end, a peripheral column insertion portion having a peripheral column insertion hole, The core pillar insertion hole of the step plate located on the upper side, the core pillar insertion hole of the spacer block, and the core pillar insertion hole of the step plate located on the lower side are arranged to overlap, and the core pillars are inserted into the three overlapping core pillar insertion holes, The step nose peripheral post insertion hole of the step board located on the upper side, the peripheral post insertion hole of the spacer block, and the step end peripheral post insertion hole of the step board located on the lower side are arranged to overlap, and peripheral posts are inserted into the step nose peripheral post insertion hole, the peripheral post insertion hole, and the step end peripheral post insertion hole, which are overlapped, A clamp is disposed between the step plate located on the upper side and the step plate located on the lower side of the outer peripheral post inserted into the step bottom portion outer peripheral post insertion hole of the step plate located on the upper side, and the clamp places the step plate located on the upper side and supports the step plate located on the upper side. spiral staircase.

2. 2. The spiral staircase according to claim 1, wherein the core column and the outer perimeter columns are the same pipe.

3. A first bracket is disposed on the perimeter post; 3. A spiral staircase as described in claim 1 or 2, wherein a first extension plate for extending from the outer periphery of the spiral staircase is placed on the first bracket, and the first extension plate is extended from the outer periphery of the spiral staircase.

4. The first extension plate has at least one outer periphery post insertion hole, 4. The spiral staircase according to claim 3, wherein the outer perimeter column equipped with the first bracket is inserted into the outer perimeter column insertion hole.

5. The first extension plate has at least two outer periphery post insertion holes, A spiral outer column located on the outer periphery of the spiral staircase is inserted into the outer periphery column insertion hole in which the outer periphery column equipped with the first bracket is not inserted, A second bracket is disposed on the outer helical post; 5. A spiral staircase as claimed in claim 3 or 4, wherein a second extension plate is mounted on the second bracket and extends from the first extension plate.

6. 6. A spiral staircase according to any one of claims 1 to 5, which is a temporary staircase or a display stand.

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