JP7024229B2 - Handrail device of the aircraft - Google Patents

Description

The present invention relates to a handrail device of an airframe provided with a handrail that is detachably attached to a scaffold of the airframe.

For example, as disclosed in Patent Document 1, in a construction machine such as a crane, a handrail for ensuring the safety of the operator is provided around the scaffolding of the operator.

In construction machinery, the handrail is designed so that the operator can attach and detach it due to the limitation of the transportation width when disassembling and transporting. However, in the configuration where the handrail is attached to the scaffold with bolts, tools are required and it takes time to attach and detach, not only the number of parts is large, but also the work at a high place is dangerous.

Therefore, in Patent Document 2, the handrail frame is attached to the scaffold by fitting a wedge-shaped hook provided at the lower end of the handrail frame to a hook holder provided at the upper end of the pedestal. The framework scaffolding is disclosed.

Japanese Patent Application Laid-Open No. 2003-192272 Japanese Unexamined Patent Publication No. 7-54480

However, in the configuration of Patent Document 2, if there is a gap between the hook and the hook receiver due to a manufacturing error, there is a problem that the handrail wobbles when attached to the scaffold. If the handrail wobbles at a high place, the operator feels uneasy about safety and cannot work with peace of mind.

Therefore, an object of the present invention is to provide a handrail device of an airframe that can attach a handrail to a scaffold in a stable state without using a tool.

The handrail device of the machine of the present invention includes a handrail detachably attached to the scaffold of the machine and a cylindrical member having a circular cross section provided on the scaffold, and the columnar member is provided in the longitudinal direction of the side surface of the scaffold. The handrail is arranged with a gap along the line, and has a handrail main body and an insertion portion provided at the lower end portion of the handrail main body and inserted into a gap between the cylindrical member and the side surface. The gap between the cylindrical member and the side surface is wider than the width of the lower part of the insertion portion and narrower than the width of the upper part of the insertion portion, and the insertion portion is inserted into the gap between the cylinder member and the side surface. The portion of the insertion portion on the side surface side is a parallel surface parallel to the side surface, and the portion of the insertion portion on the side of the cylindrical member has an inclined surface inclined toward the side surface side from top to bottom. However, the inclination of the inclined surface is linear, and when the insertion portion is inserted into the gap between the cylindrical member and the side surface, the upper end of the inclined surface is located above the upper end of the cylindrical member. The lower end of the inclined surface is located below the lower end of the cylindrical member .

According to the present invention, the handrail is attached to the scaffold by inserting the insertion portion into the gap between the side surface of the scaffold and the cylindrical member. At this time, since the gap between the side surface of the scaffold and the cylindrical member is wider than the width of the lower part of the insertion portion and narrower than the width of the upper part of the insertion portion, the insertion portion abuts on the side surface of the scaffold and the cylindrical member, respectively. This suppresses the wobbling of the handrail. Therefore, the handrail can be attached to the scaffold in a stable state without using a tool.

It is a perspective view of the handrail device of the airframe before the handrail is attached to the scaffold. It is an enlarged side view of the main part A of FIG. It is an enlarged front view of the main part A of FIG. It is a perspective view of the handrail device of the airframe after the handrail is attached to the scaffold. It is an enlarged side view of the main part B of FIG. It is an enlarged front view of the main part B of FIG. It is an enlarged front view of the main part B of FIG. 3 with the retaining pin inserted. FIG. 5 is a perspective view of FIG. 5 as viewed from below. It is an enlarged side view of the main part B of FIG. 3 explaining the force acting on the handrail when the force in the left direction acts on the upper end part of the handrail body. It is an enlarged side view of the main part B of FIG. 3 explaining the force acting on the handrail when the force in the right direction acts on the upper end part of the handrail body. It is a schematic diagram of the force acting on an inclined surface. It is an enlarged side view of the main part A of FIG. 1 explaining the rotation of a cylindrical member. It is an enlarged side view of the main part B of FIG. 3 explaining the rotation of a cylindrical member. It is an enlarged side view of the main part B of FIG. 3 in the modification. It is an enlarged side view of the main part B of FIG. 3 in another modification.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(Structure of handrail device of the aircraft)
The handrail device of the airframe of the present embodiment is provided in a crawler crane which is a construction machine. The crawler crane has a configuration in which an upper swivel body is mounted on a lower traveling body so as to be swivelable, and an operator's scaffolding is provided on, for example, the upper swivel body. The aircraft is not limited to construction machinery. Further, the construction machine is not limited to the crawler crane, and may be a wheel type crane, a crawler type, a wheel type excavator, or the like.

As shown in FIG. 1, which is a perspective view, the handrail device 1 of the airframe has a handrail 2 and a cylindrical member 3. The handrail 2 is detachably attached to the scaffold 21 of the construction machine. The cylindrical member 3 has a circular cross section and is provided on the scaffold 21.

As shown in FIG. 2A which is an enlarged side view of the main part A of FIG. 1 and FIG. 2B which is an enlarged front view of the main part A of FIG. 1, the cylindrical member 3 is formed in the longitudinal direction of the side surface 21a of the scaffold 21. They are arranged with a gap along the sides, and are arranged facing each other in the central portion of the side surface 21a. The side surface 21a on which the cylindrical member 3 is arranged to face each other is a side surface of the scaffold 21 opposite to the side surface on the upper swivel body side.

The cylindrical member 3 is rotatably supported around its axis by a pair of plate-shaped support members 22 extending in the left-right direction from the side surface 21a of the scaffold 21. The cylindrical member 3 is made of metal, but is not limited thereto. The cylindrical member 3 may be configured not to rotate about its axis.

The handrail 2 has a handrail main body 11 and an insertion portion 12 provided at the lower end of the handrail main body 11.

The insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3. The insertion portion 12 has a downwardly convex shape. The gap between the cylindrical member 3 and the side surface 21a is wider than the width of the lower part of the insertion portion 12 and narrower than the width of the upper part of the insertion portion 12.

The portion of the insertion portion 12 on the side surface 21a side is a parallel surface 12a parallel to the side surface 21a. On the other hand, the portion of the insertion portion 12 on the side of the cylindrical member 3 has an inclined surface 12b that is inclined toward the side surface 21a from top to bottom. As will be described later, the inclined surface 12b may be provided at a portion that comes into contact with the cylindrical member 3 when the insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3, and is inclined. The portion above or below the surface 12b may be a surface parallel to the vertical direction.

In the present embodiment, the side surface 21a of the scaffold 21 is parallel to or equivalent to the vertical direction, but may be inclined toward the cylindrical member 3 from top to bottom. In this case, the parallel surface 12a of the insertion portion 12 is also inclined toward the cylindrical member 3 from top to bottom so as to be parallel to the side surface 21a.

Further, the insertion portion 12 is provided with a pin hole 12c into which a retaining pin, which will be described later, is inserted.

As shown in FIG. 3, which is a perspective view, the handrail 2 is attached to the scaffold 21 by inserting the insertion portion 12 into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3.

As shown in FIG. 4A which is an enlarged side view of the main part B of FIG. 3 and FIG. 4B which is an enlarged front view of the main part B of FIG. 3, it is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3. By inserting the portion 12, the handrail 2 can be easily attached to the scaffold 21. At this time, because the insertion portion 12 has a downwardly convex shape, the insertion portion 12 can be easily inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3. When the insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3, the inclined surface 12b comes into line contact with the cylindrical member 3 and the parallel surface 12a comes into surface contact with the side surface 21a of the scaffold 21. If the handrail 2 is lifted from this state, the insertion portion 12 comes out from the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3. In this way, the handrail 2 can be easily attached to and detached from the scaffold 21.

Further, since the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3 is wider than the width of the lower portion of the insertion portion 12 and narrower than the width of the upper portion of the insertion portion 12, the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3 is formed. When the insertion portion 12 is inserted, the insertion portion 12 comes into contact with the side surface 21a of the scaffold 21 and the cylindrical member 3, respectively. As a result, the handrail 2 is suppressed from wobbling. Therefore, the handrail 2 can be attached to the scaffold 21 in a stable state without using a tool.

Further, when the insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3, the inclined surface 12b of the insertion portion 12 comes into contact with the cylindrical member 3 and the insertion portion 12 is pushed toward the scaffold 21 side. As a result, the parallel surface 12a of the insertion portion 12 parallel to the side surface 21a of the scaffold 21 comes into close contact with the side surface 21a of the scaffold 21. Then, when the inclined surface 12b of the insertion portion 12 continues to abut on the cylindrical member 3 due to the weight of the handrail 2, the parallel surface 12a of the insertion portion 12 continues to be in close contact with the side surface 21a of the scaffold 21. As a result, it is possible to further suppress the wobbling of the handrail 2.

Here, when the insertion portion 12 is inserted, the position of the insertion portion 12 may shift in the vertical direction due to the tolerance at the time of manufacturing the handrail 2. For example, if the insertion portion 12 is manufactured to be large, the position of the insertion portion 12 is displaced upward, and if the insertion portion 12 is manufactured to be small, the position of the insertion portion 12 is displaced downward. Even in such a case, the insertion portion 12 abuts on the side surface 21a of the scaffold 21 and the cylindrical member 3, respectively, and the parallel surface 12a of the insertion portion 12 comes into close contact with the side surface 21a of the scaffold 21, so that the handrail 2 can be used. Wobble is suppressed. Therefore, the handrail 2 can be attached to the scaffold 21 in a stable state regardless of the tolerance at the time of manufacturing the handrail 2.

Further, the position of the insertion portion 12 shifts in the vertical direction according to the tolerance at the time of manufacturing the handrail 2, so that a height difference occurs between both ends of the handrail main body 11, and the handrail main body 11 tilts with respect to the horizontal direction. In some cases. For example, when the handrail body 11 and the insertion portion 12 are manufactured with the maximum tolerance, the tolerance due to laser cutting at the time of manufacturing is ± 0.5 mm, and the tilt angle θ with respect to the vertical direction of the tilted surface 12b is 11 °. The position of one insertion portion 12 is displaced downward, and the position of the other insertion portion 12 is displaced upward, so that the height difference between both ends of the handrail main body 11 is about 10 mm. Even in this case, since the length of the handrail main body 11 in the horizontal direction is 1 m or more, the inclination of the handrail main body 11 with respect to the horizontal direction is 1% or less, and there is no problem in using the handrail 2. Therefore, the handrail 2 can be attached to any scaffold 21 without any problem.

As shown in FIG. 5 which is an enlarged front view of the main part B of FIG. 3 and FIG. 6 which is a perspective view of FIG. 5 viewed from below, after the handrail 2 is attached to the scaffold 21, the insertion portion 12 The retaining pin 13 is inserted into the pin hole 12c of the above. As a result, the handrail 2 is prevented from coming off by the scaffold 21.

Here, assuming that the coefficient of friction of the portion where the cylindrical member 3 and the insertion portion 12 are in contact is μ, the inclination angle θ of the inclined surface 12b with respect to the vertical direction satisfies the following equation (1).
θ ≤ tan ^-1 μ ・ ・ ・ Equation (1)

As shown in FIGS. 7A and 7B, which are enlarged side views of the main part B of FIG. 3, a case where a lateral force acts on the upper end portion of the handrail main body 11 by an operator is considered. Here, the cylindrical member 3 is arranged to face the center of the side surface 21a of the scaffold 21.

As shown in FIG. 7A, when the force F in the left direction in the drawing acts on the upper end portion of the handrail main body 11, the cylindrical member 3 is formed from the upper end of the contact region between the side surface 21a of the scaffold 21 and the parallel surface 12a of the insertion portion 12. Assuming that the vertical length to the center is "1", the vertical length from the place where the force of the handrail body 11 is acting to the center of the cylindrical member 3 is B times "1". Can be expressed as. Then, a force of BF (B times F) acts on the center of the cylindrical member 3 in the right direction in the figure, and a force of BF (B times F) acts on the upper end of the above-mentioned contact region in the left direction in the figure. It works.

Further, as shown in FIG. 7B, when the force F in the right direction in the drawing acts on the upper end portion of the handrail main body 11, the cylindrical member is formed from the lower end of the contact region between the side surface 21a of the scaffold 21 and the parallel surface 12a of the insertion portion 12. Assuming that the vertical length to the center of 3 is "1", the vertical length from the place where the force of the handrail body 11 is acting to the center of the cylindrical member 3 is B times "1". It can be expressed as a certain B. Then, a BF (B times F) force acts on the lower end of the contact region in the figure, and a BF (B times F) force acts on the center of the cylindrical member 3 in the right direction in the figure. It works.

As shown in FIG. 8, which is a schematic diagram of the force acting on the inclined surface 12b, when the force of the BF acts on the center of the cylindrical member 3, a reaction force BF is generated. The force of the BF acting on the center of the cylindrical member 3 is composed of a component orthogonal to the inclined surface 12b and a component directed upward along the inclined surface 12b. Further, the reaction force BF is composed of a normal force orthogonal to the inclined surface 12b and a frictional force directed downward along the inclined surface 12b. If the upward component is equal to or less than the frictional force described above, even if a lateral force acts on the upper end of the handrail body 11, it is inserted through the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3. The part 12 does not come off.

The angle formed by the reaction force and the normal force is the inclination angle θ with respect to the vertical direction of the inclined surface 12b. Assuming that the normal force is "1", the frictional force is represented by the coefficient of friction μ, and the upward component is represented by 1 · tan θ. Since the component facing upward is less than or equal to the frictional force, the following equation (2) holds.
tan θ ≤ μ / 1 ・ ・ ・ Equation (2)

The above equation (1) is derived from the equation (2). By satisfying this equation (1), even if a lateral force acts on the upper end portion of the handrail main body 11, the insertion portion 12 is prevented from coming off from the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3. Can be done.

Here, when the friction coefficient μ is 0.2, θ ≦ 11 °. Assuming that the weight W of the handrail 2 is 15 kg, the force P in which the parallel surface 12a of the insertion portion 12 comes into close contact with the side surface 21a of the scaffold 21 is calculated as follows when θ = 11 °.
P = W / tan11 ° = 15 / 0.194 = 77kg

Further, in this case, the force A required to remove the handrail 2 is calculated as follows.
A = P * μ + W = 77kg * 0.2 + 15kg = 30kg

When the friction coefficient μ is 0.5, θ ≦ 30 °. Assuming that the weight W of the handrail 2 is 15 kg, the force P in which the parallel surface 12a of the insertion portion 12 comes into close contact with the side surface 21a of the scaffold 21 is calculated as follows when θ = 30 °.
P = W / tan30 ° = 15 / 0.577 = 26kg

Further, in this case, the force A required to remove the handrail 2 is calculated as follows.
A = P * μ + W = 26kg * 0.5 + 15kg = 28kg

From the above, it can be seen that the parallel surface 12a of the insertion portion 12 is firmly in close contact with the side surface 21a of the scaffold 21. Further, it can be seen that a force of about twice the own weight W of the handrail 2 is required to remove the handrail 2.

Further, as shown in FIG. 9, which is an enlarged side view of the main part A of FIG. 1, when the insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3, the cylindrical member 3 is counterclockwise in the drawing. Rotate clockwise. As a result, the insertion portion 12 can be smoothly inserted.

On the other hand, as shown in FIG. 10, which is an enlarged side view of the main part B of FIG. 3, when the insertion portion 12 is removed from the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3, the cylindrical member 3 is the clock in the figure. Rotate around. As a result, the insertion portion 12 can be smoothly removed.

(Modification example)
As shown in FIG. 11 which is an enlarged side view of the main part B of FIG. 3, the handrail device 1 of the airframe may further have a flat plate (contact member) 14 fixed to the cylindrical member 3. .. The flat plate 14 has a flat surface that can come into contact with the inclined surface 12b, and rotates together with the cylindrical member 3.

When the insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3, the flat plate 14 rotates together with the cylindrical member 3, and the flat surface of the flat plate 14 abuts on the inclined surface 12b of the insertion portion 12. As a result, the inclined surface 12b comes into contact with the cylindrical member 3 via the flat surface of the flat plate 14. As a result, since the insertion portion 12 can be brought into surface contact with the cylindrical member 3, the surface pressure applied to the contact portion can be reduced as compared with the case where the insertion portion 12 is brought into line contact with the cylindrical member 3. Therefore, it is possible to prevent the handrail 2 and the cylindrical member 3 from being damaged.

Between the pair of support members 22, rotation stoppers 15 for restricting the rotation of the flat plate 14 are provided above and below the cylindrical member 3, respectively. The pair of rotation stoppers 15 regulates the rotation of the flat plate 14, so that when the insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3, the flat surface of the flat plate 14 is surely placed on the inclined surface 12b. It can be made to abut.

Further, as shown in FIG. 12, which is an enlarged side view of the main part B of FIG. 3, the handrail device 1 of the airframe further includes a prism member (contact member) 16 having a polygonal cross section fixed to the cylindrical member 3. You may be doing it. The prism member 16 is fixed to the cylinder member 3 so that the cylinder member 3 is located at the center. The prism member 16 has a plurality of planes that can come into contact with the inclined surface 12b, and rotates together with the cylindrical member 3. In this modification, the cross-sectional shape of the prism member 16 is a quadrangle, but it may be a triangle or a pentagon. When the insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3, the inclined surface 12b abuts on the cylindrical member 3 via any plane of the prism member 16. Even with such a configuration, the surface pressure applied to the contact portion can be reduced.

(effect)
As described above, according to the handrail device 1 of the airframe according to the present embodiment, the handrail 2 is attached to the scaffold 21 by inserting the insertion portion 12 into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3. .. At this time, since the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3 is wider than the width of the lower portion of the insertion portion 12 and narrower than the width of the upper portion of the insertion portion 12, the insertion portion 12 is formed between the side surface 21a of the scaffold 21 and the cylinder. It comes into contact with the member 3 respectively. This suppresses the wobbling of the handrail. Therefore, the handrail can be attached to the scaffold in a stable state without using a tool.

Further, when the insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3, the inclined surface 12b of the insertion portion 12 comes into contact with the cylindrical member 3 and the insertion portion 12 is pushed toward the scaffold 21 side. As a result, the parallel surface 12a of the insertion portion 12 parallel to the side surface 21a of the scaffold 21 comes into close contact with the side surface 21a of the scaffold 21. Then, when the inclined surface 12b of the insertion portion 12 continues to abut on the cylindrical member 3 due to the weight of the handrail 2, the parallel surface 12a of the insertion portion 12 continues to be in close contact with the side surface 21a of the scaffold 21. As a result, it is possible to further suppress the wobbling of the handrail 2.

Further, when the inclination angle θ of the inclined surface 12b with respect to the vertical direction satisfies the above equation (1), even if a lateral force acts on the upper end portion of the handrail main body 11, the side surface 21a of the scaffold 21 and the cylindrical member It is possible to prevent the insertion portion 12 from coming off from the gap with 3.

Further, the cylindrical member 3 is rotatable about its axis. Therefore, when the insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the cylindrical member 3, the cylindrical member 3 rotates, so that the insertion portion 12 can be smoothly inserted. Further, when the insertion portion 12 is removed from the gap between the side surface 21a of the scaffold 21 and the cylinder member 3, the cylindrical member 3 rotates, so that the insertion portion 12 can be smoothly removed.

Further, when a contact member such as a flat plate 14 or a prism member 16 is provided, when the insertion portion 12 is inserted into the gap between the side surface 21a of the scaffold 21 and the columnar member 3, the contact member rotates together with the columnar member 3 and contacts. The flat surface of the member abuts on the inclined surface 12b of the insertion portion 12. As a result, the inclined surface 12b abuts on the cylindrical member 3 via the plane of the abutting member. As a result, since the insertion portion 12 can be brought into surface contact with the cylindrical member 3, the surface pressure applied to the contact portion can be reduced as compared with the case where the insertion portion 12 is brought into line contact with the cylindrical member 3. Therefore, it is possible to prevent the handrail 2 and the cylindrical member 3 from being damaged.

Although the embodiments of the present invention have been described above, the present invention is merely exemplified, and the present invention is not particularly limited, and the specific configuration and the like can be appropriately redesigned. Further, the actions and effects described in the embodiments of the present invention merely list the most suitable actions and effects resulting from the present invention, and the actions and effects according to the present invention are described in the embodiments of the present invention. It is not limited to what has been done.

1 Airframe handrail device 2 Handrail 3 Cylindrical member 11 Handrail body 12 Insertion part 12a Parallel surface 12b Inclined surface 13 Retaining pin 14 Flat plate (contact member)
15 Rotation stop 16 Prism member (contact member)
21 Scaffolding 21a Side surface 22 Support member

Claims (6)

Handrails that can be attached and detached to the scaffolding of the aircraft,
A cylindrical member with a circular cross section provided on the scaffold,
Equipped with
The cylindrical member is arranged with a gap along the longitudinal direction of the side surface of the scaffold.
The handrail is
With the handrail body
An insertion portion provided at the lower end of the handrail body and inserted into the gap between the cylindrical member and the side surface, and an insertion portion.
Have,
The gap between the cylindrical member and the side surface is wider than the width of the lower part of the insertion portion and narrower than the width of the upper part of the insertion portion.
With the insertion portion inserted in the gap between the cylindrical member and the side surface,
The side portion of the insertion portion is a parallel surface parallel to the side surface.
The portion of the insertion portion on the cylindrical member side has an inclined surface that inclines toward the side surface from top to bottom.
The slope of the inclined surface is linear,
When the insertion portion is inserted into the gap between the cylindrical member and the side surface, the upper end of the inclined surface is located above the upper end of the cylindrical member, and the lower end of the inclined surface is the lower end of the cylindrical member. A handrail device for the airframe, which is characterized by being located below . The handrail device for an airframe according to claim 1 , wherein the side surface is a side surface opposite to the side surface on the airframe side of the scaffold. Let μ be the coefficient of friction of the portion where the cylindrical member and the insertion portion are in contact with each other.
The handrail device for an airframe according to claim 1 or 2 , wherein the inclination angle θ of the inclined surface with respect to the vertical direction satisfies the following equation.
θ ≤ tan-1μ The handrail device for an airframe according to any one of claims 1 to 3 , wherein the cylindrical member is rotatable about its axis. Further provided with a contact member fixed to the cylindrical member and having a flat surface,
The handrail device for an airframe according to claim 4 , wherein the insertion portion abuts on the cylindrical member through the plane of the abutting member. The handrail device for an airframe according to any one of claims 1 to 5 , wherein the airframe is a construction machine.

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