JP2014076691A - Crossing bar and railroad crossing gate having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crossing bar that bends when receiving bending load from a motor vehicle or the like and restores the shape when the bending load is released, and also has a small suspension amount at the tip end thereof in a blocking state.SOLUTION: A crossing bar 1 includes a tubular member 2 having a flexible part 21 with flexibility provided in at least a portion in the longitudinal direction thereof. The flexible part 21 has therein a coil spring 3 and a holding member 4 for holding the coil spring 3 so as to be flexible inside the flexible part 21. The coil spring 3 and the holding member 4 are fixed inside the tubular member 2 by a fixing tool 5. By this, the flexible part 21 is reinforced by the coil spring 3, allowing the shape of the tubular member 2 to be restorable by elasticity of the coil spring 3.

Description

  The present invention relates to a barrier bar and a crossing barrier having the barrier bar.

  Conventionally, a railroad crossing barrier is provided in a railroad crossing to prevent entry into a railroad crossing of a person or a car. A railroad crossing barrier has a barrier bar that blocks traffic of people, cars, and the like. The barrier rod is a hook-like member having an outer diameter of about 30 to 60 mm, and is cantilevered by the barrier body. The barrier rod is rotated and lowered by the main body of the breaker to block the passage into the railroad crossing. The barrier rod breaks when subjected to a bending load to the extent that the vehicle collides so that the vehicle can escape outside the railroad crossing when the vehicle is confined within the railroad crossing. For this reason, the barrier rod is broken by being collided with a car that forcibly enters the railroad crossing immediately before descending, and the barrier rod is frequently broken. Railway operators need to quickly replace broken breakers, and the burden of replacement is high.

  In order to reduce the number of breakage accidents caused by the impact of an automobile or the like, a barrier rod having a cross-shaped reinforcing member built in is proposed (for example, see Patent Document 1). However, when such a high-strength barrier bar is used for a crossing, it is difficult to escape from the crossing when the automobile is confined within the crossing.

  A barrier rod using a hollow tube made of an elastic resin has been proposed as a barrier rod that facilitates escape of the vehicle outside the railroad crossing and prevents breakage when the vehicle collides with the vehicle (for example, , See Patent Document 2). The barrier rod is bent when it receives a bending load due to the collision of the automobile, and is almost restored to its original shape when the bending load is released. It is necessary for the blocking rod to keep the tip drooping amount in the blocking state within a predetermined value (100 mm) and to keep it almost horizontal as a whole. However, a shield rod that is flexible enough to restore its shape after bending increases the amount of drooping of the tip due to its own weight.

  There has been proposed a shield rod that can be bent in the vertical direction by providing a leaf spring in a part of the shield rod (for example, see Patent Document 3). In this blocking rod, it is considered that the drooping amount of the tip is reduced when the leaf spring is hardened. However, such a blocking rod does not bend in the horizontal direction because the leaf spring is not in a bending direction even if it receives a bending load in the horizontal direction due to the collision of the automobile.

JP-A-8-332956 JP 2000-264212 A Japanese Patent Laid-Open No. 5-16812

  The present invention solves the above-mentioned problem, and is bent when receiving a bending load from an automobile or the like, and is restored when the bending load is released. The purpose is to provide firewood.

  The blocking rod of the present invention is provided to block passage, and includes a hollow tubular member, and the tubular member has a flexible portion at least in the longitudinal direction. The flexible portion has a coil spring inside thereof and a holding member that holds the coil spring inside the flexible portion so that the coil spring can be bent, and the coil spring and the holding member are interposed via a fixture. And is fixed inside the tubular member.

  In this barrier rod, it is preferable that the holding member has a cylindrical shape having flexibility, and the coil spring is provided inside the holding member.

  In this barrier rod, it is preferable that the holding member is made of a material that deforms when it receives a load to absorb strain energy and restores its shape when the load is released.

  In this barrier rod, it is preferable that the fixture is fixed to the tubular member and supports one end of the coil spring and the holding member.

  In this blocking rod, the tubular member has a screw hole, and the fixture has a screw hole on an outer peripheral surface that contacts the inner surface of the tubular member, and is rotated inside the tubular member by an external force. It is preferable that the concave and convex portions are provided on the opposite end of the coil spring and are screwed to the tubular member in a state where the screw hole of the fixture is aligned with the screw hole of the tubular member.

  In this barrier rod, the flexible portion preferably has a bellows structure.

  In this blocking rod, it is preferable that the tubular member has a buffer member softer than a member on the proximal end side on the distal end side with respect to the flexible portion.

  The railroad crossing barrier of the present invention has the barrier bar.

  According to the breaking bar of the present invention, the tubular member has a coil spring inside the flexible portion. Therefore, when receiving a bending load, the tubular member bends at the flexible portion, and when the bending load is released, the elasticity of the coil spring. To restore the shape. Moreover, since the flexible part is reinforced by the coil spring and the holding member, the amount of drooping of the tip is reduced in the cutoff state.

1 is a front view of a barrier rod according to an embodiment of the present invention. Sectional drawing of the flexible part vicinity in the same blocking rod. The front view of the fixing tool in the same barrier. The side view which looked at the fixing tool from the front end side. The side view which looked at the fixing tool from the base end side. 1 is a front view of a railroad crossing barrier having a barrier bar according to an embodiment of the present invention.

  A barrier rod according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the blocking rod 1 is provided to block the passage of a person or a car, and includes a hollow tubular member 2. The tubular member 2 has a flexible portion 21 having flexibility in a part in the longitudinal direction. The entire tubular member 2 may be the flexible portion 21. As shown in FIG. 2, the flexible portion 21 has a coil spring 3 and a holding member 4 inside thereof, that is, in a tube. The holding member 4 holds the coil spring 3 inside the flexible portion 21 so that the coil spring 3 can be bent. The coil spring 3 and the holding member 4 are fixed to the inside of the tubular member 2 via a fixture 5. The axial direction of the coil spring 3 is the longitudinal direction of the tubular member 2.

  The holding member 4 has a cylindrical shape having flexibility. The coil spring 3 is provided inside the holding member 4, that is, inside the cylinder.

  The holding member 4 is made of a material that is deformed when it receives a load and absorbs strain energy and whose shape is restored when the load is released. Such a material is, for example, a foamed resin. Foamed resin absorbs strain energy by a hysteresis loop of load and deformation. In the present embodiment, the material of the holding member 4 is foamed polyethylene. An elastomer foam or the like may be used as the material of the holding member 4.

  The fixture 5 is fixed to the tubular member 2 and supports one end of the coil spring 3 and the holding member 4. As shown in FIGS. 3 and 4, the fixture 5 has an axisymmetric shape, a fixture body 51 having a cylindrical outer shape, a hole 52 into which one end of the coil spring 3 is inserted, And a small-diameter portion 53 inserted into one end of the holding member 4. In this embodiment, the fixture 5 is formed by molding polycarbonate. The fixture 5 may be integrally formed, or a plurality of parts may be coupled by screws or the like.

  The tubular member 2 has a screw hole 22 (see FIG. 2). The fixture 5 has a screw hole 54 on the outer peripheral surface 511 that contacts the inner surface of the tubular member 2 in the fixture main body 51. An embedded nut 541 is provided in the screw hole 54 of the fixture 5. The fixture 5 has an uneven portion 55 for rotating inside the tubular member 2 by an external force at an end portion on the opposite side of the coil spring 3. As shown in FIG. 5, in the present embodiment, the projections and depressions 55 have a cross as a convex portion and a portion other than the cross as a concave portion. The fixture 5 is screwed to the tubular member 2 with a screw 56 in a state where the screw hole 54 of the fixture 5 is aligned with the screw hole 22 of the tubular member 2 (see FIG. 2). In addition, the shape of the convex part of the unevenness | corrugation 55 is not limited to a cross, A polygon etc. may be sufficient. Moreover, you may make the recessed part of the unevenness | corrugation 55 into a cross.

  A jig is used when inserting the fixture 5 into the tubular member 2 (not shown). The jig includes a shaft portion that is thinner than the inner diameter of the tubular member 2. The shaft portion has a distal end portion having a shape corresponding to the unevenness 55 of the fixture 5 at the distal end, and a grip thicker than the shaft portion on the proximal end side. The fixture 5 is inserted into the tubular member 2 using such a jig in a state where the coil spring 3 and the holding member 4 are attached.

  The flexible part 21 has a bellows structure (see FIG. 1). The tubular member 2 has a cushioning member 24 that is softer than the proximal end member 23 on the distal end side of the flexible portion 21. In the tubular member 2 of the present embodiment, the entire front end side of the flexible portion 21 is a tubular buffer member 24. The member 23 on the proximal end side of the tubular member 2 is made of high density polyethylene, and the buffer member 24 is made of low density polyethylene. The flexible portion 21 has a bellows structure made of a composite material in which a high-density polyethylene band is spirally welded to the surface of a tubular low-density polyethylene.

  As a modified example, the distal end side of the flexible portion 21 may also be made of high-density polyethylene, and a buffer member 24 made of low-density polyethylene may be attached to the distal end of the flexible portion 21 by a heat shrinkable tube or the like. The flexible portion 21 may have a bellows structure made of a single material such as high-density polyethylene having a shape in which peaks and valleys are alternately repeated in the longitudinal direction. In addition, the material of the tubular member 2 is not limited to these. The blocking rod 1 may omit the buffer member 24 in a use environment where a person does not pass.

  In the blocking rod 1 configured as described above, the tubular member 2 has the coil spring 3 inside the flexible portion 21, so when receiving a bending load, the tubular member 2 bends at the flexible portion 21 and the bending load is released. Then, the shape is restored by the elasticity of the coil spring 3. Further, since the flexible portion 21 is reinforced by the coil spring 3 and the holding member 4, the amount of drooping of the tip of the blocking rod 1 is small in the blocking state. The hardness of the coil spring 3 is set so that the amount of drooping at the tip of the blocking rod 1 is not more than a predetermined value and bends at the flexible portion 21 when a bending load is applied by an automobile or the like.

  A crossing barrier 6 having the barrier 1 of the present embodiment will be described with reference to FIG. The railroad crossing breaker 6 includes a breaker body 61, a proximal-side blocking bar 62 attached to the breaker body 61, and a distal-side blocking bar 1. The base end blocking bar 62 is made of FRP and has almost no function of restoring its shape. The front end side blocking rod 1 is the blocking rod 1 of the present embodiment, and is inserted into the distal end of the proximal end side blocking rod 62, and the connecting portion is taped so as not to be removed. The length of the blocking bar 1 on the tip side is about 1.6 m. The total length of the blocking rod composed of the distal blocking rod 1 and the proximal blocking rod 62 is, for example, about 6 m. The lengths of the blocking rods 1 and 62 on the distal end side and the proximal end side are set to appropriate lengths according to the road width and the like at the crossing. The front end side blocking rod 1 and the proximal end side blocking rod 62 are colored in yellow and black stripes.

  In the crossing barrier 6 configured as described above, the position of the barrier 1 on the tip side is higher during the lowering of the barrier. For this reason, the automobile that forcibly crosses the railroad crossing while the barrier rod is descending travels on the tip side and collides with the barrier rod 1 on the tip side. A person who forcibly crosses the railroad crossing while the barrier rod is descending passes under the barrier rod 1 on the tip side and pushes the barrier rod 1 up. The front end side blocking rod 1 is bent laterally or upwardly by the flexible portion 21 in response to a bending load caused by a collision of a car or a human hand, and the shape is restored when the bending load is released.

  As described above, according to the blocking rod 1 according to the present embodiment, the tubular member 2 has the coil spring 3 inside the flexible portion 21. Therefore, when receiving a bending load, the tubular member 2 bends at the flexible portion 21 and the bending load is reduced. When released, the shape is restored by the elasticity of the coil spring 3. Further, since the flexible portion 21 is reinforced by the coil spring 3 and the holding member 4, the amount of drooping of the tip of the blocking rod 1 is small in the blocking state. Since the coil spring 3 is inside the tubular member 2, the coil spring 3 is not exposed, and even if a person touches the blocking rod 1, a human finger or the like is not sandwiched between the coils of the coil spring 3. Since the coil spring 3 is not exposed, the coil spring 3 is not exposed to wind and rain outdoors, so that durability is increased.

  Since the holding member 4 has a cylindrical shape having flexibility, and the coil spring 3 is provided inside the holding member 4, the coil spring 3, the flexible portion 21, and the coil spring 3 can be reduced even if the outer diameter of the coil spring 3 is reduced. And the amount of drooping at the tip of the blocking rod 1 is reduced. By reducing the outer diameter of the coil spring 3, the coil spring 3 is reduced in weight.

  Since the holding member 4 is deformed and absorbs strain energy when it receives a load, the vibration energy of the coil spring 3 when the shape of the bent breaking barb 1 is restored is absorbed by the holding member 4, and the vibration of the barb 1 Decays quickly.

  Since the fixing tool 5 is fixed to the tubular member 2 and supports one end of the coil spring 3 and the holding member 4, movement of the coil spring 3 and the holding member 4 is prevented. Since the fixing tool 5 does not fix both ends of the coil spring 3 and the holding member 4, it does not hinder the bending of the coil spring 3 and the holding member 4.

  Since the fixture 5 has irregularities 55 for rotating inside the tubular member 2, the screw holes 22 and 54 can be easily aligned when screwed to the tubular member 2.

  Since the flexible part 21 has a bellows structure, the flexibility with respect to the bending load is improved.

  Since the blocking rod 1 has the buffer member 24, when the tip of the blocking rod 1 comes into contact with a person or a car, the impact on the person or the car is alleviated.

  Since the railroad crossing barrier 6 has such a barrier rod 1, it is bent when the barrier rod 1 is subjected to a vehicle collision or the like, so that it is difficult to break and is reinforced by the coil spring 3 and the holding member 4. In the cut-off state, the amount of drooping of the tip due to its own weight is reduced.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, the blocking bar 1 may have a plurality of flexible portions 21. The level crossing barrier 6 may be configured as the barrier bar 1 of the present embodiment as a whole. Moreover, you may block the passage of a motor vehicle etc. by providing the blocking fence 1 in the entrance of a parking lot, a toll road, etc.

DESCRIPTION OF SYMBOLS 1 Barrier 2 Tubular member 21 Flexible part 22 Screw hole 23 Base end side member 24 Buffer member 3 Coil spring 4 Holding member 5 Fixing tool 511 Outer peripheral surface 54 Screw hole 55 Concavity and convexity 6 Level crossing barrier

Claims (8)

A blocking fence provided to block traffic,
Comprising a hollow tubular member,
The tubular member has a flexible portion having flexibility in at least a part of the longitudinal direction,
The flexible portion has a coil spring inside thereof, and a holding member that holds the coil spring inside the flexible portion so as to be bendable.
The coiling spring and the holding member are fixed inside the tubular member through a fixture, and the shielding rod is characterized in that The holding member is a cylinder having flexibility,
2. The barrier rod according to claim 1, wherein the coil spring is provided inside the holding member.   3. The barrier rod according to claim 2, wherein the holding member is made of a material that deforms to absorb strain energy when subjected to a load and restores its shape when the load is released.   4. The barrier rod according to claim 2, wherein the fixing member is fixed to the tubular member and supports one end of the coil spring and the holding member. The tubular member has a screw hole,
The fixing device has a screw hole on an outer peripheral surface that comes into contact with the inner surface of the tubular member, and has an unevenness for rotating inside the tubular member by an external force at an end portion on the opposite side of the coil spring, 5. The barrier rod according to claim 4, wherein the shield member is screwed to the tubular member in a state where the screw hole of the fixture is aligned with the screw hole of the tubular member.   The barrier rod according to any one of claims 1 to 5, wherein the flexible portion has a bellows structure.   7. The barrier rod according to claim 1, wherein the tubular member has a buffer member softer than a member on a proximal end side at a distal end side with respect to the flexible portion. A railroad crossing barrier having the barrier bar according to any one of claims 1 to 7.

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