JP7602267B2 - High-altitude work components and high-altitude work method - Google Patents

Description

The present invention relates to a member for high-altitude work that is attached to the end of the arm of a crane for high-altitude work, and a method for high-altitude work using the member for high-altitude work.

Conventionally, for high-altitude work such as pruning trees, electrical work on tall buildings, and painting exterior walls, high-altitude work vehicles have been used, which have a box-shaped work platform at the end of the crane's arm and a control device on the work platform that controls the length of the arm and the elevation angle. However, such high-altitude work vehicles require a control structure that is electrically connected between the crane body and the work platform in order to control the length of the arm and the elevation angle from the work platform, which creates problems of a complex configuration and high costs.

In addition, because the worker works while standing inside the box-shaped work platform, a control mechanism is required to keep the floor of the work platform horizontal regardless of the angle at which the crane's arms are raised, which makes the configuration complicated and increases costs. Furthermore, the range in which the worker can work is limited to the range that the worker can reach while standing inside the box-shaped work platform. This means that in order to work over a wide range, the work platform needs to be moved, and the task of frequently moving the work platform is cumbersome. Another problem is that the box-shaped work platform is bulky, making it impossible to work in small spaces where the work platform would interfere with surrounding objects.

On the other hand, it has also been proposed to attach a detachable box-shaped work platform to the end of the crane's arm to perform work at height (see, for example, Patent Document 1). With such a work platform, the length of the crane's arm and the angle at which it is raised or lowered are generally controlled by the crane itself or via a remote control operated by a worker standing on the work platform. This has a simpler configuration than the above-mentioned high-altitude work vehicle, which has a control device on the work platform, and has the advantage of being able to use a crane that can also be used for other purposes.

However, even with these types of work platforms for high-altitude work, the worker works while standing inside the box-shaped work platform, so a control mechanism is still required to keep the floor of the platform level regardless of the angle at which the arms are raised, which creates the same problems of complicated configurations and high costs. Furthermore, similar to high-altitude work vehicles, there are disadvantages in that the range in which a worker can work is limited to the range that the worker can reach while standing inside the box-shaped work platform, and in that work cannot be done in environments where the bulky box-shaped work platform interferes.

In order to solve the problems of such a box-shaped work platform, the applicant has proposed a frame-shaped member for high-altitude work that is attached to the tip of the arm of a crane (see Patent Document 2). This member for high-altitude work includes a main frame, an inner member that extends from the main frame toward the internal space and forms multiple closed spaces in the internal space of the main frame, and multiple protruding members that protrude from the inner member without further closing the closed spaces. Two ropes attached to the worker's body are passed through the closed space, tension is applied to at least one of the ropes to support the worker's body on the member for high-altitude work, and by changing the protruding member to which one rope is hooked, the anchor point can be moved without removing the rope, making it easy for the worker to take various postures with his or her body leaning outward, and the work positioning system allows work to be performed over a wide range. In addition, because it has a simple frame-shaped structure, it can be manufactured at low cost and has the advantage of being able to enter a narrow space and perform work.

The applicant is continuing to develop these advantageous components for working at height, with the aim of making them even easier to use and expanding the range of work (applications) they can be used for. The present invention was made during this process.

JP 2003-171093 A JP 2020-164267 A

In view of the above, the present invention aims to provide a member for working at height that is easier to use and has a wider range of applicable work, and a method for working at height using the member for working at height.

In order to solve the above problems, the member for working at height according to the present invention comprises:
"A component for working at height that is attached to the tip of the arm of a crane,
A frame having a substantially rectangular outer shape and at least one closed space formed therein;
a first support portion extending outwardly from the frame;
a first member having a plurality of protruding members protruding from the frame toward the inside of the closed space without closing the closed space;
The first member does not have a member that serves as a foothold for a worker ,
The first support portion extends from one end of the frame so that the first member has an "L" or "L" shape .

The "arm" of a crane is the rod-shaped part of the crane that extends and retracts, and is called the "jib" or "boom."

The high-altitude work member of this configuration is used when external objects such as tree branches and rump parts, civil engineering and architectural structures, etc. are used as scaffolding. In the high-altitude work method using this high-altitude work member, two ropes (first rope, second rope) are used, which are fastened to the body of the worker and passed through the closed space of the high-altitude work member. The first rope is mainly used as a rope (lanyard) that supports the body of the worker on the high-altitude work member in a U-shaped hanging state. On the other hand, the second rope, as described below, is a rope that moves the anchor point without removing it from the high-altitude work member, and is used as a moving rope when changing the position or posture of the worker. The first rope and the second rope are each tensioned by adjusting their lengths. The tension of at least one of the first rope and the second rope allows the body of the worker to be supported on the high-altitude work member, ensuring a stable posture, and work can be performed using the work positioning system.

By applying tension to at least one of the ropes, the worker can work with his or her body leaning outward from the scaffold. This allows the worker to work over a wider area than if the worker were standing upright inside a box-shaped work platform.

In addition, the working at height component has multiple protruding members that protrude from the frame toward the closed space inside the frame without further closing the closed space. Therefore, by using the working at height component with the free ends of the protruding members facing upward, the anchor point, which is the intersection between the frame and the protruding members, can be moved without removing the second rope from the working at height component. Therefore, by adjusting the length of the first rope to maintain tension while moving the anchor point of the second rope, the worker can vary his or her position and posture relative to the working at height component, allowing the worker to work over a wide range. Furthermore, by being able to move the anchor point of the second rope, the worker can always work in a stable and comfortable posture.

By using two ropes, each with adjustable length, when the tension on one rope is loosened, for example when loosening the tension on the second rope to move the anchor point, the other rope remains tensioned, allowing the worker to maintain a stable posture.

Furthermore, at least one of the first and second ropes can be passed through the closed space within the frame, and will not come off the work component at height unless the worker intentionally removes it. Therefore, when changing the attachment position of one of the ropes to the work component at height to place the worker in a position or posture that is easy for the worker to work in, even if the rope is removed from the work component at height, the other rope will function as a fall prevention rope (backup rope). This effectively prevents the worker from falling, and allows work at height to be performed safely.

The present configuration of the working component for high altitudes is a structural body in which only one first support column extends from a frame-shaped frame, and has a very simple structure. In addition, while conventional box-shaped work platforms require a control mechanism to keep the floor on which the worker stands horizontal regardless of the angle at which the crane is raised or lowered, the present configuration of the working component for high altitudes does not require such a mechanism. Therefore, the present configuration of the working component for high altitudes has an extremely simple structure and can be manufactured at low cost.

Furthermore, since only one first support extends from the frame and the structure does not have any parts that can serve as a foothold for the worker, it can be made lighter than conventional components for working at height (Patent Document 2), which had a part that could serve as a foothold within the main frame. This makes it easier to attach the components for working at height to the arms of the crane. Also, the configuration in which only one first support extends from the frame is close to an L-shape or a U-shape, making it easier to enter narrower spaces than conventional components for working at height (Patent Document 2). This makes it possible to work in very narrow spaces that have footholds, such as entering a tree canopy and using tree branches or rump parts as footholds, and thus broadens the range of work targets.

The member for working at height according to the present invention has the following structure instead of the above structure:
" A component for working at height that is attached to the tip of the arm of a crane,
A frame having a substantially rectangular outer shape and at least one closed space formed therein;
a first support portion extending outwardly from the frame;
a first member having a plurality of protruding members protruding from the frame toward the inside of the closed space without closing the closed space;
The first member does not have a member that serves as a foothold for a worker,
Further comprising a second member,
The second member includes:
A second support portion detachably connected to the first support portion;
a crosspiece member extending from the second support portion in a cross direction without closing a space between the second support portion and the frame;
and a lower protruding member protruding from at least the rail member and having a free end.

The high-altitude work component of this configuration is equipped with a second member, and the second member can be used as a scaffold. Specifically, the soles of the feet can be placed on the intersection of the lower protruding member protruding from at least the crosspiece member and the crosspiece member to use as a scaffold. Therefore, in cases where there is no scaffold capable of supporting body weight, such as tree branches or rump parts, or civil engineering or architectural structures, or when external scaffolding is available but difficult to use, the second support part can be connected to the first support part to use the high-altitude work component with a scaffold. On the other hand, when using external scaffolding, the second member is removed and used.

In this way, the high-altitude work component of this configuration, which is equipped with the second member, can be used in two ways: with the second member attached, and with the second member removed.

In addition, when the second member is attached, the crosspiece extends from the second support section connected to the first support section in a crossing direction without closing the space between it and the frame. In other words, the second member is cantilevered by the first member. Therefore, even if a second member that serves as a foothold is provided, it can be made lighter than when the second member is supported on both sides of the frame. Furthermore, because the space on the opposite side of the cantilever support is open, there is an advantage in that it is easier to enter smaller spaces than when the second member is supported on both sides of the frame.

Next, the method for working at height according to the present invention comprises the steps of:
"A method of working at height using a member for working at height comprising the second member described above, a first rope and a second rope,
The first rope is U-shaped with both ends fastened to both sides of the worker's torso and is equipped with a first length adjuster,
The second rope is a rope that is looped by fastening both ends to the abdomen of the worker, or a rope that is fastened to the abdomen of the worker at one end and has a loop-shaped portion at the other end that can be opened and closed, and is equipped with a second length adjuster;
The first rope supports the body of the worker on the member for working at height, while the second rope is passed through the closed space, and one of the intersections between the frame and the protruding member is set as an anchor point of the second rope, thereby making it possible to change the anchor point of the second rope;
By adjusting the length using the first length adjuster or the second length adjuster, tension is applied to at least one of the first rope and the second rope, and the worker's body is supported by the member for working at height while work is performed using a work positioning system;
When using scaffolding external to the high-altitude work member, the second member is removed by disconnecting the first support portion from the second support portion, and when the second support portion is connected to the first support portion, the second member is used as scaffolding.

This is a method of working at height using a member for working at height when a second member is provided, and as described above, two types of work are possible: work can be carried out using the second member as a scaffold with the second member attached, and work can be carried out using an external scaffold with the second member removed.

As described above, the present invention provides a member for working at height that is easier to use and can be used in a wider range of work, and a method for working at height using the member for working at height.

FIG. 1 is an exploded view of a member for working at height according to one embodiment of the present invention. 2 is a diagram illustrating the relationship between the first rope and the second rope worn by a worker and the member for working at height in FIG. 1 . FIG. FIG. 11 is a diagram illustrating high-altitude work using a high-altitude work member with a second member attached thereto.

The following provides a detailed explanation of an embodiment of the present invention, a member 1 for working at height, and a method for working at height using the member 1 for working at height, with reference to the drawings.

First, the configuration of the member for working at height 1 will be described mainly with reference to FIG. 1. The member for working at height 1 comprises a first member 10 and a second member 20.

The first member 10 comprises a frame 10f, a first support portion 11, a support member 12, and a number of protruding members 18a, 18b. The frame 10f has a generally elongated rectangular shape and has a first closed space S1 inside. This first closed space S1 corresponds to the "closed space" of the present invention. The size of the frame 10f can be, for example, 80 cm to 120 cm in the longitudinal direction and 15 cm to 40 cm in the direction perpendicular to the longitudinal direction.

Only one first support column 11 extends from one end of the frame 10f in the longitudinal direction. The first support column 11 is cylindrical and forms an angle slightly smaller than a right angle with respect to the longitudinal direction of the frame 10f. The first support column 11 has multiple through holes 11h. These through holes 11h are used to attach the first member 10 to the tip of the crane's arm, and are also used to connect to the second member 20.

Here, the member for working at height 1 is used so that the first support 11 is in the up-down direction. As described below, the member for working at height 1 is used so that the worker's posture is maintained, so it is not used rolled over 90 degrees or inverted 180 degrees, but it may be used tilted. Therefore, the up-down direction of the member for working at height 1 refers to the up-down direction of the worker supported by the member for working at height 1, and does not refer only to the vertical direction.

When considering the vertical direction of the frame 10f in relation to the vertical direction of the working-at-height member 1 when in use, multiple protruding members 18a protrude from the portion extending in the longitudinal direction below the frame 10f toward the inside of the first closed space S1 without closing the first closed space S1. The protruding height of the protruding members 18a can be 5 cm to 20 cm.

The support member 12 connects a portion of the first support section 11 that is slightly removed from the joint with the frame 10f to a portion of the frame 10f that is slightly removed from the joint with the first support section 11. As a result, the frame 10f, the first support section 11, and the support member 12 form a triangular frame body, inside which a second closed space S2 is formed.

In this embodiment, multiple protruding members 18b protrude from the support member 12 toward the inside of the second closed space S2 without closing the second closed space S2. The protruding height of the protruding members 18b can be 5 cm to 20 cm, similar to the protruding members 18a.

The second member 20 includes a second support portion 21, a crosspiece member 22, and lower protruding members 28a and 28b.

The second support section 21 is a member longer than the first support section 11, and has a cylindrical or columnar connecting section 21b at one end. The outer size of the connecting section 21b is slightly smaller than the inner circumference of the first support section 11, and the connecting section 21b can be inserted into the end of the first support section 11. The connecting section 21b has a plurality of through holes 21h. The spacing between the plurality of through holes 21h is equal to the spacing between the plurality of through holes 11h in the first support section 11, and the second support section 21 can be connected to the first support section 11 by inserting the connecting section 21b into the end of the first support section 11, and then inserting a pin through the through holes 21h and 11h and fastening it with a fastener.

The crosspiece member 22 extends from the end of the second support portion 21 opposite the end where the connecting portion 21b is provided, in a direction intersecting the axial direction of the second support portion 21. The angle that the crosspiece member 22 makes with the second support portion 21 is an obtuse angle, and when the second support portion 21 is connected to the first support portion 11, the crosspiece member 22 is approximately parallel to the longitudinal direction of the frame 10f. In other words, the crosspiece member 22 extends without closing the space between it and the frame 10f.

A lower protruding member 28a protrudes from the second support portion 21 at a right angle to the second support portion 21. Furthermore, multiple lower protruding members 28b protrude from the crosspiece member 22 at a right angle to the crosspiece member 22. The length of the lower protruding members 28a, 28b can be 5 cm to 20 cm. Note that although the illustration shows a case where there is one lower protruding member 28a, there may be multiple lower protruding members.

The length of the first support section 11 and the second support section 21 can be set so that when they are connected, the distance between the frame 10f and the crosspiece member 22 is 130 cm to 180 cm.

Although not shown in the drawings, the intersections of the various components of the high-altitude work component 1 (frame 10f, first support 11, support member 12, second support 21, crosspiece 23, protrusions 18a, 18b, lower protrusions 28a, 28b) are curved to avoid sharp corners. The outer surface of each component is smooth with no protrusions that could catch the rope. This prevents damage to the rope when it is wrapped around the intersections of the components or when it is slid along the components.

Next, a method of using the member for working at height 1 having the above-mentioned configuration will be described. The member for working at height 1 can be used with only the first member 10, and can also be used with the second member 20 attached to the first member 10. In either case, the worker wears a harness, and uses a first rope 41 that is fastened to annular fasteners 31 on both sides of the belt 30 that wraps around the torso to form a U-shape, and a second rope 42 that is fastened to annular fasteners 32 on the abdomen of the belt 30 at both ends to form a ring shape, as shown in FIG. 2. The first rope 41 is equipped with a first length adjuster 41b for adjusting the length, and the second rope 42 is similarly equipped with a second length adjuster 42b for adjusting the length. The first length adjuster 41b and the second length adjuster 42b adjust the length of the rope by friction, and can be one that generates friction by tying the rope or one that generates friction by pinching the rope between metal fittings. Note that FIG. 2 illustrates the relationship between the first rope 41 and second rope 42 worn by the worker and the member for working at height 1, and does not show the worker and the member for working at height 1 while working at height.

The first rope 41 is passed through the second closed space S2 or the first closed space S1 in the member for working at height 1 and then fastened to the fastener 31. As a result, the folded-back portion of the first rope 41 is inside the closed space, so the first rope 41 will not come off the member for working at height 1. For example, as shown in FIG. 2, when the first rope 41 is passed through the second closed space S2, any one of the multiple intersections between the first support column 11 and the support member 12 that constitute the second closed space S2, or the intersections between the support member 12 and the protruding member 18b, becomes the anchor point of the first rope 41.

The second rope 42 is passed through the first closed space S1 in the member for working at height 1 and then fastened to the fastener 32. As a result, the folded-back portion of the second rope 42 is also inside the first closed space S1, so that the second rope 42 does not come off the member for working at height 1. Note that here, a rope that is looped by fastening both ends to the fastener 32 is exemplified as the second rope 42, but the second rope 42 can be a rope that has one end fastened to the fastener 32 and has an openable loop-shaped portion at the other end. In this case, the second rope 42 is passed through the closed space with the loop-shaped portion at the tip open, and then the loop-shaped portion is closed. Even with such a second rope 42, the folded-back portion of the loop-shaped portion is inside the closed space, so that the second rope 42 does not come off the member for working at height 1. Examples of ways in which the loop of the second rope 42 can be opened and closed include a way in which a metal fitting that opens and closes in a ring, such as a carabiner, is attached to the end of a single rope, and both ends of a short rope are fastened to this metal fitting, and a way in which a loop is created by tying the end of a single rope.

In the first closed space S1 through which the second rope 42 is passed, a protruding member 18a protrudes from the frame 10f, and the end of the protruding member 18a is a free end. Therefore, by positioning the member for working at height 1 so that the protruding member 18a protrudes upward, the anchor point of the second rope 42 can be moved without removing the second rope 42 from the member for working at height 1. Specifically, each of the multiple intersections between the frame 10f and the protruding member 18a becomes an anchor point of the second rope 42.

Similarly, the protruding member 18b protruding inward in the second closed space S2 through which the first rope 41 passes also has a free end. Therefore, the multiple intersections between the support member 12 and the protruding member 18b can each be used as anchor points for the first rope 41, and the anchor points can be moved.

Next, a method of working at height using the member for working at height 1 will be described. First, a case in which only the first member 10 is used will be described. Prior to using the member for working at height 1, the first member 10 is attached to the arm of a crane. Although not shown, the crane is provided with a mounting fixture with a U-shaped cross section at the tip of the arm, with a pair of side sections connected on the same side. A plurality of through holes are drilled at corresponding positions in the pair of side sections, and the spacing between these through holes is the same as the spacing between the plurality of through holes 11h in the first support section 11. Thus, the first support section 11 of the first member 10 is positioned between the pair of side sections of the mounting fixture of the crane, and the first member 10 can be fixed to the arm of the crane by fastening a pin that has passed through the through hole of the mounting fixture and the through hole 11h of the first support section with a fastener.

The worker hangs from the work component 1 for high altitudes with the attached first rope 41 and second rope 42 passing through the closed space as described above. In this state, the extension and elevation angle of the crane's arms are controlled to move the work component 1 for high altitudes to a location where the worker will use as a foothold, such as the branches or rump of a tree, or a civil engineering or architectural structure.

When the worker reaches the scaffolding, he or she steps onto it and performs work while moving along it. During work, the lengths of the first rope 41 and the second rope 42 are adjusted to keep at least one of them under tension. This allows the worker to take a variety of postures while his or her body is stably supported by the member for working at height 1. Even when the worker's body position or posture changes as the worker moves, or when the crane's arm is moved as the worker moves, or when the angle of the member for working at height 1 is changed by changing the angle at which the arm is raised or lowered, at least one of the two ropes is always kept under tension.

In this way, high-altitude work performed using the high-altitude work component 1 of this embodiment is performed using a work positioning system, so work can be performed with the body leaning outward from the scaffolding, allowing work to be performed over a wide area.

As described above, in the first closed space S1 through which the second rope 42 passes, multiple protruding members 18a with free ends protrude inward, making it possible to move the anchor point without removing the second rope 42. Since the length of the second rope 42 needs to be changed in order to move it, there is a period during the movement when the second rope 42 is not under tension, but even during that time the worker's body can be stably supported by the tension of the first rope 41.

When a worker changes his/her position relative to the member for working at height 1 to assume a more stable posture, the angle of the member for working at height 1 may be changed. The angle of the member for working at height 1 can be changed by changing the angle at which the arms of the crane are raised and lowered, and the angle at which the arms are raised and lowered can be changed by the operator of the crane itself operating the control device, or by a control signal sent to the control device from a remote control carried by the worker working at height.

In addition, there are cases where the anchor point of the first rope 41 needs to be changed in order for the worker to take a posture that is easy to work in. As shown in the figure, when the first rope 41 is passed through the second closed space S2, the anchor point can be moved without removing the first rope 41 because the second protruding members 18b with free ends protrude toward the inside of the second closed space S2. In that case, too, there is a time when the first rope 41 is not tensioned due to the movement of the first rope 41, but during that time, the worker's body can be stably supported by the tension of the second rope. In addition, when the closed space through which the first rope 41 is passed is changed to a different closed space (from the second closed space S2 to the first closed space S1, or vice versa), the first rope 41 is temporarily removed from the member for high-altitude work 1, but the second rope 42 is passed through the first closed space S1 and does not come off the member for high-altitude work 1. Therefore, by applying tension to the second rope 42, the body of the worker can be stably supported by the member for high-altitude work 1 even while the first rope 41 is removed.

Furthermore, in the past, when pruning trees, workers would climb the tree to perform work, and would fasten ropes or other supports to the tree's branches or trunks to support the worker's body. Therefore, if the branch selected as the anchor point was dead or rotten and had low strength, there was a risk that the branch would break and the worker would fall. In contrast, when working using the member for working at height 1, even if the worker's weight is placed on an external scaffolding, the anchor points of the first rope 41 and the second rope 42 are always inside the member for working at height 1. Therefore, even if the branch that the worker was using as a foothold breaks and the worker loses his foothold, the first rope 41 and the second rope 42 can prevent the worker from falling.

In addition, the first member 10 as the member for working at height 1 does not have a foothold, and has a shape close to an approximately L-shape with only one first support 11 extending from the end of the frame 10f. This makes it easy to enter very narrow spaces where there is a foothold, such as a treetop with thick branches.

In addition, the first member 10 has two closed spaces (first closed space S1, second closed space S2), and in each space a protruding member with a free end protrudes toward the inside of the closed space (protruding members 18a, 18b). Therefore, there are many different positions that can be taken by moving the anchor point without removing the first rope 41 or the second rope 42, and the range of work targets is wider.

Furthermore, the support member 12 not only forms a second closed space S2 between the frame 10f and the first support portion 11, but also acts to increase the mechanical strength of the first member 10 by connecting the frame 10f and the first support portion 11 at an angle.

The first member 10 has a very simple configuration with only one first support extending from the end of the frame 10f, making it lightweight and easy to attach to the end of the crane's arm by hand, and its simple configuration allows it to be manufactured at low cost.

Next, a case where the high-altitude work member 1 is used with the second member 20 connected to the first member 10 will be described. When connecting the second member 20 to the first member 10, the connecting portion 21b of the second support portion 21 is inserted into the free end of the first support portion 11, and the first support portion 11 is sandwiched between a pair of side portions of the mounting fixture on the arm of the crane in the same manner as described above. The through hole provided on the side portion of the mounting fixture is connected to the through hole 11h of the first support portion 11 and the through hole 21h of the second support portion 21, and a pin 51 is passed through the through hole and fastened with a fastener (see FIG. 3), thereby connecting the second member 20 to the first member 10 and fixing the first member 10 to the arm of the crane.

When working at height using the member for working at height 1 with the second member 20 attached, the second member 20 can be used as a foothold for the worker, as shown in FIG. 3. In the second member 20, the lower protruding member 28b protrudes from the crosspiece member 22, so that the worker can place the sole of the foot on it to use as a foothold that is not slippery. In addition, the lower protruding portion 28a also protrudes from the second support portion 21, so that the worker can place the sole of the foot on it to use as a foothold.

Except for the fact that the part that serves as the worker's foothold is the configuration of the member for working at height 1 itself, the method of working at height while applying tension to at least one of the first rope 41 and the second rope 42 is the same as the above-mentioned method of working at height using the first member 10 as the member for working at height 1.

When the worker is transported to the work site with the second member 20 attached to the member 1 for working at height, the worker can stand on the member 1 for working at height without being suspended, and can be transported with the member 1 for working at height supporting the worker's body. While the worker is on the member 1 for working at height, even when the crane's arm is being moved or when working at height, tension is always applied to at least one of the first rope 41 and the second rope 42, so that the member 1 for working at height supports the worker's body.

The work-at-height member 1 with the second member 20 attached can be used as a foothold to perform work at height, making it suitable for work when there is no foothold available outside or when external footholds are difficult to use. For example, this can be used when pruning from the periphery of a tree crown or when work needs to be performed inside a tree crown with thin branches.

The second member 20 is supported by the first member 10 in a cantilevered manner. Therefore, even if the second member 20 is provided as a foothold, it is lighter than when the second member 20 is supported on both sides of the frame. Furthermore, since the space on the opposite side of the cantilevered support is an open space Os, it is easier to enter smaller spaces than when the second member 20 is supported on both sides of the frame, which has the advantage that it is easier for the worker to change the direction and posture of his or her body.

The member 1 for working at height can be used in two ways: with the second member 20 attached, or with the second member 20 removed. Therefore, the second member 20 can be attached and detached to perform work at height when an external scaffold is used, when there is no external scaffold, or when there is external scaffold but it is difficult to use.

The present invention has been described above with reference to preferred embodiments, but the present invention is not limited to the above embodiments, and various improvements and design changes are possible without departing from the spirit of the present invention, as described below.

For example, the positions and numbers of the protruding members 18a, 18b and the lower protruding members 28a, 28b are not limited to those shown in the figure. Also, while the example shows a case where there is one closed space inside the frame 10f (first closed space S1), there may be two or more closed spaces.

In the above, an example was given of a case where the through hole 11h provided in the first support portion 11 for attachment to the arm of the crane is also used to connect the second support portion 21 to the first support portion 11. This is not limited to the above, and a through hole for connecting the second support portion 21 in the first support portion 11 can be provided separately from the through hole 11h. In that case, the second member 20 can be connected to the first member 10 after the first member 10 is attached to the arm of the crane, which further reduces the labor burden and makes manual work easier.

Furthermore, in the above, an example was given in which the member for working at height 1 comprises a first member 10 and a second member 20, and the second member 20 can be attached and detached as necessary. However, the present invention is not limited to this, and the member for working at height can be made up of only the first member 10 without the second member 20, assuming that an external scaffolding will be used. In this case, the first support part can be made up of a solid member, since there is no need to insert the second support part.

In the above, tree pruning has been mainly used as an example of high-altitude work, but the high-altitude work components of the present invention can be used for a variety of high-altitude work, such as electrical work in tall buildings and painting exterior walls.

REFERENCE SIGNS LIST 1 Member for working at height 10 First member 10f Frame 11 First support column portion 18a, 18b Protruding member 20 Second member 21 Second support column portion 22 Crosspiece member 28a, 28b Lower protruding member 30 Belt 41 First rope 41b First length adjuster 42 Second rope 42b Second length adjuster S1 First closed space S2 Second closed space

Claims (3)

A member for working at height that is attached to the tip of the arm of a crane,
A frame having a substantially rectangular outer shape and at least one closed space formed therein;
a first support portion extending outwardly from the frame;
a first member having a plurality of protruding members protruding from the frame toward the inside of the closed space without closing the closed space;
The first member does not have a member that serves as a foothold for a worker ,
The first support portion extends from one end of the frame, so that the first member has an "L" shape or a "L" shape.
A member for working at height. A member for working at height that is attached to the tip of the arm of a crane,
A frame having a substantially rectangular outer shape and at least one closed space formed therein;
a first support portion extending outwardly from the frame;
a first member having a plurality of protruding members protruding from the frame toward the inside of the closed space without closing the closed space;
The first member does not have a member that serves as a foothold for a worker,
Further comprising a second member,
The second member includes:
A second support portion detachably connected to the first support portion;
a crosspiece member extending from the second support portion in a cross direction without closing a space between the second support portion and the frame;
A member for working at height, comprising : a lower protruding member protruding from at least the crosspiece member and having a free end. A method for working at height using the member for working at height according to claim 2, a first rope and a second rope,
The first rope is U-shaped with both ends fastened to both sides of the worker's torso and is equipped with a first length adjuster,
The second rope is a rope that is looped by fastening both ends to the abdomen of the worker, or a rope that is fastened to the abdomen of the worker at one end and has a loop-shaped portion at the other end that can be opened and closed, and is equipped with a second length adjuster;
The first rope supports the body of the worker on the member for working at height, while the second rope is passed through the closed space, and one of the intersections between the frame and the protruding member is set as an anchor point of the second rope, thereby making it possible to change the anchor point of the second rope;
By adjusting the length using the first length adjuster or the second length adjuster, tension is applied to at least one of the first rope and the second rope, and the worker's body is supported by the member for working at height while work is performed using a work positioning system;
A method for working at height, characterized in that, when using scaffolding external to the high-altitude work member, the second member is detached by disconnecting the first support portion from the second support portion, and when the second support portion is connected to the first support portion, the second member is used as scaffolding.

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