JPH073734A - Safety pole - Google Patents

Abstract

PURPOSE:To improve safety by respectively installing an upper end and a lower end of a coil spring arranged in a pole on a sliding plate and a plate fastened on the pole and connecting the pole and a pole base part to each other with a wire. CONSTITUTION:When a shock is added to a safety pole by collision of a car and others and the safety pole 1 is inclined, a wire 8 tries to keep its length and adds force in the direction to draw a sliding plate toward it. The sliding plate 16 compresses a coil spring 12 and air flows in a cylinder 30 through a through hole 10, a space 32 and a through hole 28. Consequently, by compression of the coil spring 12 and resistance of air following restoration of the coil spring 12, it is possible to absorb a shock by the collision.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety pole having high safety and soft return.

[0002]

2. Description of the Related Art Most of the guard poles for lifts and trucks in factories and safety poles used for car stops at entrances are made of steel and do not deform. Therefore, when the car collides with the pole, the impact damages or breaks the pole, thereby damaging the human body. Moreover, a strong accidental return of the pole due to the reaction of the impact often leads to a major accident. In particular, if a person is caught between the car and the pole, the impact may cause a loss of life. Therefore, the inventors have proposed a safety pole in which a coil spring is used at the base of the pole to absorb the impact, and the impact and its reaction are reduced (Japanese Patent Application No. 4-34406). However, in order to further reduce the shock received by the car or human body, it is necessary for the pole to absorb the shock and reduce the shake against the shock, reduce the reaction force thereof, and slowly return to the soft.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a safety pole which (1) absorbs impact and (2) softly returns to the impact.

[0004]

The safety pole according to the present invention is a safety pole having a columnar pole and a pole base portion separately provided below the pole, and a coil spring extending and contracting in the longitudinal direction is inserted into the pole. , A sliding plate that is slidably attached to the inner surface of the pole is attached to the upper end of the coil spring, means for supporting the lower end of the coil spring is provided inside the pole, and a through hole is provided at a position above the sliding plate. The upper plate provided with is fixed inside the pole, a through hole is provided in the pole at a position higher than the upper plate, and the pole and the pole base are connected by a wire fixed to the sliding plate.

Preferably, as a means for supporting the lower end of the coil spring, a third member fixed inside the pole is used.
Attach the lower end of the coil spring to the plate.

Further, it is more preferable that a packing is attached around the slidable plate to enhance the adhesion between the inner peripheral surface of the pole and the plate. When one of the above wires is used, it is preferable to arrange this wire on the center line of the pole, and when a plurality of wires are used, it is preferable to arrange these wires symmetrically with respect to the center line of the pole. Further, the above-mentioned poles may be U-shaped, and a pole base may be separately provided at the lower part of the U-shape.

A safety pole according to a seventh aspect of the present invention is a safety pole having a columnar pole and a pole base portion separately provided below the pole, wherein a coil spring that expands and contracts in the longitudinal direction is provided in the pole. Insert a slide plate that is in close contact with the inner surface of the pole and is slidable at the upper end of the coil spring, and provide a means for supporting the lower end of the coil spring inside the pole, and at a position above the sliding plate, A through hole is provided in the pole, and the wire is fixed to the sliding plate to connect the pole and the pole base.

[0008]

According to the present invention, when the pole swings due to an impact, the wire fixed to the pole base pulls the sliding plate inside the pole, and the sliding plate moves inside the pole toward the pole base side like a piston, The air is sucked through the through holes of the upper plate and the through holes of the upper plate. The sucked air acts as a brake, and the coil spring and the air absorb the shock caused by the swing of the pole. The coil spring pushes up the plate in an attempt to restore it, and at the same time exhausts air from inside the pole. For this reason, the force that the pole tries to return to its original position is weakened, and the swing-back of the pole becomes soft.

If the lower end of the coil spring is attached to the third plate fixed inside the pole, the center line of the wire can be held even when the pole swings. Further, it is preferable that packing is attached to the outer peripheral surface of the plate to improve the adhesion with the inner peripheral surface of the pole and prevent air leakage. Since the wire must be able to withstand the impact,
It is preferable that a thick one is arranged on the center line of the pole when there is only one wire, and a plurality of thin wires are arranged so as to be symmetrical on the center line of the pole so that the impact is uniformly applied to the wire. If the poles are U-shaped and the bases of the poles are provided separately at the bottoms of the U-shapes, it is possible to obtain a safety pole that is more robust against shocks, absorbs shocks, and swings back softly.

The shock can be absorbed even if the air is sucked and exhausted only through the through hole provided in the pole without using the upper plate provided with the through hole.

[0011]

1 shows a safety pole 1 according to an embodiment. In the figure, 2 is a cylindrical pole made of steel, stainless steel, resin or the like. Reference numeral 4 denotes a cylindrical pole base made of the same material as that of the pole 2, which is a separate body from the pole 2 so that the pole 2 tilts with respect to the base 4 against an impact. As shown in the figure, the safety pole 1 has a base 4 fixed to concrete 8 or the like, and is connected to the pole 2 slightly above the concrete 8 to prevent sand or stones from entering. Reference numeral 10 denotes a through hole provided on the side surface of the pole 2 for sucking air into the pole 2 and exhausting air from the pole 2. The through holes 10 are provided not on the head of the pole 2 but on the side surface thereof in order to prevent rainwater and the like from entering and also to provide a safety cap or the like on the head.

Although not shown, the safety pole 1 may be provided with a rotary lamp, a safety cap made of resin or the like at the tip of the pole 2, and of course, may be painted and finished with a color that is conspicuous or fluorescent. In the embodiment, a durable steel or stainless steel pole 2 is used, but if a resin or the like is used instead, it becomes easy to carry. At this time, if a light or the like is housed inside using a translucent resin and an optical sensor is provided so that the light blinks at night, attention can be easily drawn and safety is improved. The shape of the head of the pole 2 is free, but a smooth shape as shown in FIG. 1 is safe. The size of the safety pole 1 can be freely determined, but the length of the pole 2 is 800 mm and the diameter is 100 mm.

FIG. 2 shows a longitudinal section of the embodiment of FIG. Reference numeral 12 denotes a coil spring made of steel, stainless steel, or the like housed inside the pole 2. The lower end portion of the coil spring 12 is welded to the lower plate 14 and the upper end portion is welded to the sliding plate 16. Here, the lower plate 14 is fixed to the inner peripheral surface of the pole 2 by spot welding or whole surface welding. A ring or the like may be used instead of the plate 14 to support the coil spring 12. The coil spring 12 and the plates 14 and 16 do not have to be welded to each other and may be fixed to each other. On the other hand, the sliding plate 16 has an outer diameter substantially the same as the inner diameter of the pole 2, and is provided so as to be vertically movable on the inner circumferential surface of the pole 2 without being welded to the inner circumferential surface of the pole 2. Rubber packing 1 is provided on the outer peripheral surface of the sliding plate 16.
7 is provided to prevent air leakage due to the vertical movement of the sliding plate 16. Reference numeral 18 is a wire such as steel or stainless steel, which is fixed to the sliding plate 16 and the wire fixing plate 20 by welding or bolting 22. The wire fixing plate 20 is
It is fixed by welding to the inner peripheral surface of the pole base 4. Wire 18
The length of the coil 18 is arbitrary, and the wire 18 is slightly tensioned to fix it to the sliding plate 16 and the fixed plate 20.
To be compressed a little. As a result, when the sliding plate 16 is pulled by the impact, the coil spring 12 is further compressed. Further, in the embodiment, the wire fixing plate 20 is provided inside the pole base portion 4 instead of the upper portion, so that a large force is applied to the welding portion between the plate 20 and the pole base portion 4 and the portion where the wire 18 is fixed to the plate 20 at the time of impact. This is to prevent joining.

A wire positioning plate 24 is provided to hold the center line of each wire 18 when the pole 2 is tilted with respect to the pole base 4 and to smooth the return of the pole 2. The wire 18 penetrates the plates 14 and 24 and connects the pole 2 and the pole base 4. In the embodiment, the lower end of the coil spring 12 is supported by the lower plate 14, and the wire 18 is passed through the plate 14 to hold the center line of the wire 18. When providing the lower plate 14, the wire positioning plate 24 may be omitted. Plate 1
Steel, stainless steel or the like is used for 6, 14, 24 and 20, and the thickness thereof is arbitrary.

FIG. 3 is a sectional view taken along the line AA of FIG. 2, showing the arrangement of the coil spring 12 and the wire 18. Coil spring 1
Numeral 2 is provided so as to be in close contact with the inner peripheral surface of the pole 2, and one having a strong spring force is used so as to withstand impact. Further, as the wire 18, for example, four wires having a diameter of 4 mm are used, and penetrate the inside of the spring 12 to be fixed to the sliding plate 16 and the wire fixing plate 20. The thickness and the number of the wires 18 may be arbitrarily determined. For example, six wires may be used, and the other diameter 8
A single mm wire 18 may be used and fixed so as to be provided on the center line of the pole 2. When using a plurality of wires 18, install them symmetrically with respect to the center line of the pole 2 so that an impact is applied to the wires 18.
To evenly add to.

Returning to FIG. 2, reference numeral 26 is an upper plate made of steel, stainless steel, or the like, which is fixed to the inner peripheral surface of the pole 2 by welding, and a through hole 28 is provided substantially in the center thereof. Reference numeral 30 denotes a cylinder portion of the pole 2, which is a space sandwiched between the upper plate 26 and the sliding plate 16. As the sliding plate 16 moves up and down, air flows from the through hole 28 into the cylinder portion 30 through the through hole 10 and the space 32, and conversely from the cylinder portion 30 into the through hole 28, the space 32, and the through hole 10. Exhaust. The thickness of the upper plate 26 and the diameters of the through holes 10 and 28 are such that the suction of air into the cylinder 30 as the sliding plate 16 moves up and down,
The exhaust is preferably defined such that it acts sufficiently as an air spring. The safety pole 1 is fixed to the concrete 8 with bolts 34 or the like.

The operation of the embodiment will be described with reference to FIGS. FIG. 4 shows a state of the safety pole 1 when a shock is applied due to a vehicle collision or the like. When an impact is applied, the pole base 4 is fixed to the concrete 8, so the pole 2 tilts as shown in the figure. The wire 18 is fixed by pulling the sliding plate 16 and the wire fixing plate 20, and the fixing plate 2
0 is fixed to the pole base 4. The wire 18 itself hardly stretches against the impact, and when the pole 2 tilts, the wire 1
Since 8 tries to keep its length, a force is applied in the direction of attracting the sliding plate 16, and the sliding plate 16 compresses the coil spring 12. Packing 17 on plate 16
Since there is no air leakage from the periphery of the sliding plate 16, the sliding plate 16 acts as a piston to try to take in air into the cylinder portion 30 from the outside. Air flows into the cylinder portion 30 through the through hole 10, the space 32, and the through hole 28. At this time, the air passes through the through holes 10 and 28 having a very small diameter, and the cylinder 30
The larger the cross-sectional area, the greater the resistance when passing through the through holes 10 and 28 having the smaller diameter, and the greater the force acting as the air spring. The air suction force of the cylinder 30 increases as the inclination of the pole 2 increases and the displacement of the sliding plate 16 increases, so that the force of the air spring further increases during a large impact.
This is because the coil spring 12 is pressed by the impact, and the air spring works to press the coil spring 12 further.
It means that the pole 2 absorbs the shock.

The operation when the pole 2 swings back will be described with reference to FIG. The coil spring 12 compressed by the sliding plate 16 due to the impact pushes up the sliding plate 16 in an attempt to restore it, the sliding plate 16 moves to a position determined by the length of the wire 18, and the pole 2 returns to the original position. At this time, the force applied to the sliding plate 16 from the coil spring 12 is equal to the force applied to the coil spring 12 by the impact, which is weakened by the air spring. When the impact is large, the force for pushing up the sliding plate 16 is large, and when the impact is small, it is small. Sliding plate 16 is pushed up and cylinder 30
In order to compress the air inside, the air is pushed out from the cylinder 30 through the through hole 28, the space 32, and the through hole 10. At this time, the force for pushing out the air is almost proportional to the pressing force on the coil spring 12. However, since the air must pass through the small holes 28, 10 at the time of evacuation as well as when it flows into the cylinder 30, its resistance greatly reduces the force for pushing the air out. This is equivalent to weakening the force for the pole 2 to return to the original position, that is, weakening the swing-back force of the pole 2, and the air spring is applied to the force for swinging the pole 2 back. If the force for swinging back the pole 2 is large, the resistance for pushing out the air is large and the air spring is also large.

In the safety pole 1 of the embodiment, at the time of impact, the coil spring 12 is pressed, and the air spring is applied to this to absorb and alleviate the impact. When the pole 2 swings back, the restoring force of the coil spring 12 is reduced by the air spring to weaken the force for swinging back. In either case, through the coil spring 12,
Let this be done with an air spring. Further, if the force on the pole 2 is large, the force of the air spring is also increased accordingly, so that the pole 2 does not swing too much, and its reaction is small. Moreover, since the coil spring 12 is gently restored, the pole 2
Slowly swings back, and there is almost no vibration associated with the sudden swingback. Since the coil spring 12 and the air spring absorb the force applied to the pole 2 at the time of impact, the inclination of the pole 2 is small, and as a result, the swing back is small.

Even in such a large impact, the pole 2
Does not break too much, and the rebound due to the reaction is small. Therefore, even if a person or the like is caught between the pole 2 and the car or the like, damage due to pressure can be minimized and a serious accident can be prevented. Further, it is possible to prevent the driver from being injured by the swinging back and damaging the vehicle or the like. Further, even if the vehicle or the like collides with the vehicle without causing an accident, damage to the vehicle and the pole 2 is small.

In the embodiment, a plurality of wires 18 or one wire 18 is used, but in either case, even if the impact on the pole 2 is applied from any direction, the pole 2 is prevented from falling in the opposite direction and breaking the pole 2. it can. If one wire 18 is thick, it is tough to use a thick wire with a diameter of 8 mm, and if multiple wires with a diameter of 4 mm are used, only one of them will be used.
Even if a book is cut, it can function as pole 2.

FIG. 6 shows a modification of the safety pole. In the figure, the safety pole 100 is a U-shaped head of two safety poles. The outer diameter of the base portion 4 of the safety pole 100 is set larger than the outer diameter of the pole 2 in consideration of stability and strength. The inside of the poles 2 and 2 is the safety pole 1 of the embodiment.
It has the same structure as. The safety pole 100 has a U-shaped portion 38
In contrast, the strength against impact applied in a direction almost perpendicular to the is increased. That is, when an impact is applied to the pole 2 portion or the U-shaped portion 38 in this direction, the safety pole 100 is broken in the opposite direction. Since the safety pole 100 uses the two poles 2, the shock absorption is large and the swing-back is even smaller.

[0023]

EFFECTS OF THE INVENTION The safety pole according to the present invention (1) reduces the impact, so that the impact is small even if a vehicle or the like hits, (2)
It does not shake too much with respect to the impact, the recoil is small, and (3) the swing-back force is small and it swings back slowly and softly, so the impact caused by the swing-back on the human body or car can be reduced, and damage can be minimized. (4) By connecting the tops of multiple poles with a U-shaped member, it is possible to obtain a safety pole that is more robust against shocks, absorbs shocks, and softly swings back.

[Brief description of drawings]

FIG. 1 is a perspective view of a safety pole according to an embodiment.

2 is a longitudinal sectional view of the safety pole of the embodiment of FIG.

FIG. 3 is a sectional view of the safety pole of the embodiment of FIG. 2 taken along the line AA.

FIG. 4 is a cross-sectional view showing the use state of the safety pole of the embodiment.

FIG. 5 is a cross-sectional view showing a use state of the safety pole of the embodiment.

FIG. 6 is a perspective view of a modified safety pole.

[Explanation of symbols]

 1,100 Safety pole 2 pole 4 Pole base 10,28 Through hole 12 Coil spring 14 Lower plate 16 Sliding plate 18 Wire 20 Wire fixing plate 24 Wire positioning plate 26 Upper plate 30 Cylinder part

Claims (7)

[Claims] 1. A safety pole having a columnar pole and a pole base provided separately below the pole, wherein a coil spring extending and contracting in the longitudinal direction is inserted into the pole, and the coil spring is attached to the upper end of the coil spring. An upper plate having a sliding plate attached to the inner surface of the pole so as to be slidable and having means for supporting the lower end of the coil spring inside the pole, and a through hole provided at a position above the sliding plate. Is a safety pole in which the pole and the base of the pole are connected by a wire fixed to the sliding plate. 2. The safety pole according to claim 1, wherein the lower end of the coil spring is attached to a third plate fixed to the inside of the pole as a means for supporting the lower end of the coil spring. 3. The safety pole according to claim 1, wherein a packing is attached around the sliding plate. 4. The wire is a single wire, and the wire is arranged on the center line of the pole.
Safety pole. 5. The safety pole according to claim 1, wherein a plurality of said wires are provided and these wires are arranged symmetrically with respect to a center line of the pole. 6. The safety pole according to claim 1, wherein the pole is U-shaped, and a pole base is separately provided at a lower portion of the U-shape. 7. A safety pole having a columnar pole and a pole base provided separately in a lower portion of the pole, wherein a coil spring that expands and contracts in the longitudinal direction is inserted into the pole, and the coil spring is attached to the upper end of the coil spring. A sliding plate that is slidably attached to the inner surface of the pole is attached, and means for supporting the lower end of the coil spring is provided inside the pole, and a through hole is provided in the pole at a position above the sliding plate. A safety pole that connects the pole and the pole base with a wire fixed to the sliding plate.