Entry prevention device

Abstract

To provide entry prevention devices that can mitigate the impact of vehicle contact or collisions with people. [Solution] Multiple interconnected openings 4 are formed on the side of the support column 2. A wire 5 is inserted through the multiple openings 4. A loop 6 is formed at the end of the wire 5. A chain 3 is connected to the loop 6 via a connector 7. The chain 3 is stretched across the multiple support columns 2. If a vehicle or person comes into contact with the chain 3, the impact is mitigated by the play between the wire 5 and the inner edge of the opening 4, the flexibility of the wire 5 itself, and the deformation of the loop 6.

Description

Technical Field

[0001] The present invention relates to an access prevention device formed by hanging a chain over a plurality of columns.

Background Art

[0002] For example, for the purpose of indicating the boundary between a roadway and a sidewalk, indicating a location where passage or entry is prohibited in a park, street, etc., or serving as a partition in a parking lot, columns are erected on the road surface to stop vehicles, and a chain is hung over the columns to restrict the passage of vehicles and people (for example, Patent Document 1).

[0003] As shown in FIG. 7(a), the access prevention device of Patent Document 1 has a structure in which a substantially horizontal connecting hole 102 is penetrated in the vicinity of the upper end of a metal column 101, and a metal holder 103 is inserted into the connecting hole 102 so as to be removable, and the ends of an access prevention chain 104 are connected to both sides of the holder 103.

[0004] As shown in FIG. 7(b), the holder 103 has a structure in which a pair of U-shaped wire rod members are fixed, and the width is set to be substantially the same as the inner diameter of the connecting hole 102 so as to be held horizontally. The holder 103 locks an engaging member 105 fixed to the end of the access prevention chain 104 using the bent ends at both ends as locking portions, and connects the access prevention chain 104 to both sides of the column 101.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, the entry prevention device described in Patent Document 1 consists of a metal support column with a connecting hole formed in it through which a metal holder of the same dimensions and high rigidity is inserted. This makes it difficult to absorb the impact when a vehicle comes into contact with the entry prevention chain or when a person bumps into it, which could result in damage to the vehicle or injury to a person.

[0007] The present invention aims to provide an intrusion prevention device that can mitigate the impact of vehicle contact or collisions with people. [Means for solving the problem]

[0008] To achieve the above objective, the intrusion prevention device according to the present invention consists of a chain stretched between a plurality of support posts, with a plurality of interconnected openings formed on the side surfaces of the support posts, through which a wire is inserted, and a loop is formed at the end of the wire, to which the chain is connected via a connector.

[0009] According to the above configuration, a loop portion for connecting the chain is formed at the wire end of the wire that is inserted through the opening on the side of the support column. This allows the wire diameter and the opening diameter to be set to a size that creates some play between them, while the loop portion acts as a stopper to prevent the wire from coming out of the support column, maintaining the wire's insertion position, and also allowing the wire to be inserted into and removed from the opening by deforming the loop portion.

[0010] This wire structure allows for mitigation of the impact of vehicle contact or collision with a person when a vehicle or person comes into contact with the chain connected to the wire loop. This is achieved through the play between the wire and the inner edge of the opening, the flexibility of the wire itself, and the deformation of the loop. In particular, the wire loop serves not only as a part for connecting the chain but also as a part for absorbing impact.

[0011] Furthermore, even if the chain ends are repeatedly displaced in the longitudinal direction due to, for example, the chain swaying in the wind, the loop portion at the end of the wire deforms and expands and contracts, absorbing the displacement of the chain ends and suppressing the movement of the wire relative to the support opening, thereby preventing wear caused by repeated relative movement of the two.

[0012] Regarding the insertion of the wire into the support column opening, it is first conceivable to insert it into openings at symmetrical positions on the column. However, because the wire can easily deform, it is also possible to insert it into openings at different heights, or into openings on mutually perpendicular surfaces of the column.

[0013] Here, for the intermediate support posts of the intrusion prevention device, chains can be attached to the loops at both ends of the wire inserted through the support post opening, and for the end support posts of the intrusion prevention device, a chain can be attached to only one end of the wire. When a chain is attached to only one end of the wire, the other end of the wire can be fixed to the support post by attaching a separate retaining device to the loop or by fastening a retaining device in place of the loop.

[0014] Alternatively, multiple openings may be formed in the support column so that multiple chains can be strung across them.

[0015] This configuration, by using multiple chains, visually emphasizes that passage is prohibited or entry is forbidden, while also physically preventing children and small animals from passing through.

[0016] In this case, for the intermediate support posts of the intrusion prevention device, one option is to connect chains of the same height to the loops at both ends of the wire. However, it is also possible to arrange multiple wires in an X shape that intersects within the support post, inserting the ends of each wire into openings at different heights and connecting chains of different heights to the loops at both ends of each wire. By arranging the wires in an X shape and tilting them in this way, the force transmitted from the chains can be distributed vertically and transmitted to the support post, reducing the load on the support post. In other words, the force acting on the chain is transmitted to the support post via the wires, and while most of the force is transmitted to the support post through the opening from the wire end connected to the chain, the remaining force is transmitted to the support post through the opening from the wire end on the opposite side. Therefore, when a strong force acts on a chain at a high position, if the wires are arranged horizontally, all of the force transmitted from the chain acts on the high part of the support post via both ends of the wires, resulting in a large moment acting on the support post and a greater load. In contrast, by tilting the wire, a portion of the force can be directed to a lower point on the support column, thereby reducing the moment acting on the column and alleviating the load.

[0017] For the end posts of an intrusion prevention device consisting of multiple chains, one possible method is to first connect the chains of each height to one end of a wire, and then insert the other end of the wire into an opening at the same height as the one end and fix it to the post. However, since the wire can be made sufficiently thin, it is also possible to insert the other ends of multiple wires into a common opening and fix them together. Furthermore, the wire can be arranged to form a U-shape within the post, and the loops at both ends can be inserted into upper and lower openings on the same side of the post to connect the upper and lower chains to a common wire.

[0018] Furthermore, by forming the support column from a flexible material, a particularly preferred embodiment of the present invention can be provided.

[0019] In other words, by forming the support column with a flexible material, it can deform and absorb the impact when a vehicle comes into contact with it, protecting the vehicle and its occupants, while also protecting the column itself through its restorative properties. On the other hand, for example, if a person or animal forcefully strikes the chain, the impact will cause a large force to act on the column instantaneously, potentially causing the flexible column to buckle and collapse. In this case, the chain will sag close to the ground, potentially causing someone who was not caught by the chain to hit the ground, or allowing animals to enter. This creates a new problem: the flexibility of the column compromises the intrusion prevention function of the device, at the expense of protecting the vehicle and its occupants.

[0020] In contrast, by adopting the configuration of the present invention, the impact acting on the chain can be absorbed, suppressing the instantaneous application of large forces and preventing the support column from falling over. This makes it possible to achieve both the protection of the vehicle and occupants through the flexibility of the support column and the maintenance of the intrusion prevention function of the intrusion prevention device. [Effects of the Invention]

[0021] As described above, according to the present invention, a wire with a loop formed at the end is inserted into an opening on the side of a support column, and a chain is connected to the loop at the end of the wire, thereby forming an intrusion prevention device in which a chain is stretched across multiple support columns.

[0022] As a result, even if a vehicle or person comes into contact with the chain, the play between the wire and the inner edge of the opening, the flexibility of the wire itself, and the deformation of the loop can mitigate the impact of contact by a vehicle or a person bumping into it. Moreover, even if the chain end is repeatedly displaced due to the effects of wind, the deformation of the loop at the end of the wire absorbs this displacement, preventing wear caused by the wire moving relative to the opening of the support post. [Brief explanation of the drawing]

[0023] [Figure 1](a) is a front view of the access prevention device according to the present invention, and (b) is a cross-sectional view taken along the line A-A thereof. [Figure 2] A side view of the support column, showing a partial cross-sectional view [Figure 3] A front view of the wire [Figure 4] A perspective view of the connector [Figure 5] Showing another form of the insertion state of the wire. (a) is a cross-sectional view of an end support column in which a chain is connected to one end ring portion of the wire and a connector is attached to the other end ring portion. (b) is a cross-sectional view of an end support column in which a chain is connected to one end ring portion of the wire and a retaining member is fixed to the other end. (c) is a cross-sectional view of an intermediate support column in which the wire is inserted into apertures in planes perpendicular to each other. [Figure 6] Showing yet another form of the insertion state of the wire. (a) is a longitudinal cross-sectional view of an end support column in which the other ends of a plurality of stages of wires are fixed to a common aperture. (b) is a longitudinal cross-sectional view of an end support column in which upper and lower chains are connected to both end ring portions of a U-shaped wire. (c) is a longitudinal cross-sectional view of an intermediate support column in which the wires are arranged in an X shape. [Figure 7] A view showing a conventional access prevention device

Embodiments for Carrying Out the Invention

[0024] Hereinafter, embodiments of the access prevention device according to the present invention will be described with reference to the drawings.

[0025] As shown in FIG. 1, the access prevention device 1 is for hanging a chain 3 over a plurality of support columns 2 to indicate the boundary between a roadway and a sidewalk, or to indicate a location where passage or entry is prohibited in a park, street, etc., or to serve as a partition in a parking lot. Openings 4 that communicate with each other are formed in pairs on the side surface of the support column 2, and these pairs of openings 4 are formed in a plurality of stages. For each stage, a wire 5 is inserted into the pair of openings 4, and a ring portion 6 is formed at the end of the wire. By connecting the chain 3 to the ring portion 6 via a connector 7, a plurality of stages of the chain 3 are hung over the support column 2.

[0026] As shown in Figure 2, the support column 2 can utilize, for example, a rubber pole used as a road lane divider or traffic guidance marker. It is formed in a cylindrical shape with its upper end closed, using a flexible material such as polyurethane, and is erected by fixing its base 8 to the road surface. The support column 2 has air holes for releasing internal air. In the event of a collision with a vehicle or other object, the flexibility of the material allows it to easily deform and absorb the impact, and then easily return to its original shape due to the material's restorative force. The air holes consist of a total of six holes of the same size that penetrate the inner and outer walls of the support column 2. These six air holes are divided into three pairs, and each pair of air holes is formed to be symmetrically positioned and at the same height with respect to the central axis of the column. The three pairs of air holes are positioned alternately in the front-to-back direction (left-to-right direction in Figure 2) or left-to-right direction (front-to-back direction toward the plane of the paper in Figure 2) along the wall of the support column 2, while being arranged at equal intervals in the vertical direction. As a result, one row of air holes is formed on the front and rear portions of the peripheral wall of the support column 2, and two rows of air holes are formed on the left and right portions of the peripheral wall of the support column 2, and the two rows of air holes located on the left and right portions of the support column 2 are used as openings 4.

[0027] As shown in Figure 3, the wire 5 is made of a flexible wire with sufficient strength, and its ends are folded back and crimped to form loops 6, generally called eyes, at both ends of the main body portion 5a, which is set to have a smaller diameter than the opening 4. When inserted through the pair of openings 4, the length of the loops 6 is set so that they protrude from the openings 4 to the outside of the support column 2. This wire 5 has loops 6 that are wider than the openings 4 in a free state to prevent them from coming loose, and the loops 6 can be deformed to easily insert and remove them from the openings 4, making the wire 5 detachable from the support column 2. This allows the user to select a state with two chains 3, one chain 3, or no chains 3 depending on the situation. Examples of wire materials that make up the wire 5 include carbon wire, piano wire, and stranded wire. In particular, it is desirable to use materials with excellent weather resistance, such as those coated with resin, for example.

[0028] As shown in Figure 4, the connector 7 has a structure that is ring-shaped overall by overlapping the ends of an elastic curved material. The end of the chain 3 and the loop 6 of the wire 5 are connected by opening the overlapping portion 9 and passing it through. This connector 7 is set to be larger than the opening 4 and also functions as a stopper to prevent the loop 6 of the wire 5 from being pulled inside the support column 2. In addition to the connector 7, other connectors such as snap hooks or shackles can also be used.

[0029] According to the above configuration, since the main body portion 5a of the wire 5 is smaller than the opening 4 and has a flexible structure, when a vehicle or person comes into contact with the chain 3, the play between the wire 5 and the inner edge of the opening 4, the flexibility of the wire 5, and the deformation of the loop portion 6 can mitigate the impact of contact by a vehicle or a person bumping into it. Furthermore, since the support column 2 is formed from a flexible material, the support column 2 can be used as a wheel stopper that absorbs impact when a vehicle comes into contact with it. Moreover, because the wire 5 absorbs impact, for example, when a person or animal bumps hard into the chain, it is possible to suppress the instantaneous strong force acting on it, and prevent the cylindrical support column 2 from buckling due to the instantaneous strong force. As a result, it is possible to prevent the support column 2 from falling over with a relatively weak force that does not involve impact after buckling, and it is possible to prevent people from falling to the ground without being caught by the chain 3, or allowing animals to pass through.

[0030] It should be noted that the present invention is not limited to the embodiments described above, and modifications can be made as appropriate within the scope of the present invention. For example, in the intermediate support column 2 shown in Figure 1(b), the chain 3 is connected to the loops 6 on both sides of the wire 5, but for the end support column 2, as shown in Figure 5(a), the chain 3 is not connected to the loop 6 at the other end of the wire 5, and only the connector 7 is attached to prevent it from coming off. Also, as shown in Figure 5(b), a wire 11 with a retainer 10 attached to the other end instead of a loop 6 can be used. Furthermore, as shown in Figure 5(c), the corner portion of the intrusion prevention device 1 can be configured by inserting the wire 5 through openings 4 at orthogonal positions instead of symmetrical positions on either side of the central axis of the support column 2, and placing it in a corner, for example, in a convenience store parking lot. The wire 5 has a flexible structure that can be easily deformed and can be inserted through any opening 4 that can be arbitrarily selected on the spot.

[0031] Furthermore, in the support column 2 shown in Figure 1(a), the wire 5 is inserted through openings 4 at the same height. However, for the end support column 2, as shown in Figure 6(a), the other ends of the two sections of wire 5 can be inserted through a common opening 4 and fixed together. In addition, instead of fixing the bundled two sections of wire 5 to the support column 2, a common chain 3 can be connected, thereby changing the number of chains 3 that are stretched across both sides of the support column 2. Also, as shown in Figure 6(b), the wire 5 can be arranged in a U-shape inside the support column 2, and the loops 6 at both ends can be inserted through the upper and lower openings 4 on the same side of the support column 2 to connect the upper and lower chains 3 to the common wire 5. Furthermore, as shown in Figure 6(c), by arranging the two sections of wire in an X-shape that intersects inside the support column 2, the ends of each wire 5 can be inserted through openings 4 at different heights, and chains 3 of different heights can be connected to the loops 6 at both ends of each wire 5. [Explanation of symbols]

[0032] 1 Entry prevention device 2 pillars 3 chains 4 hole 5 wires 6 limbus 7. Connectors 8 base 9 Wrap section 10. Anti-loosening measures 11 wires

Claims

1. An intrusion prevention device consisting of a chain stretched between multiple support posts, An intrusion prevention device characterized in that a plurality of interconnected openings are formed on the side surface of the support column, a wire is inserted through the plurality of openings, a loop is formed at the end of the wire, and the chain is connected to the loop via a connector.

2. The intrusion prevention device according to claim 1, characterized in that multiple stages of openings are formed in the support column and multiple stages of chains are stretched across them.

3. The intrusion prevention device according to claim 1 or 2, characterized in that the support column is formed from a flexible material.

Images